We consider work extraction from two finite reservoirs with constant heat capacity, when the thermodynamic coordinates of the process are not fully specified, i.e., are described by probabilities only. Incomplete information refers to both the specific value of the temperature as well as the label of the reservoir to which it is assigned. Based on the concept of inference, we characterize the reduced performance resulting from this lack of control. Indeed, the estimates for the average efficiency reveal that uncertainty (...) regarding the exact labels reduces the maximal expected efficiency below the Carnot value ), its minimum value reproducing the well known Curzon–Ahlborn value: \ . We also estimate the efficiency before the value of the temperature is revealed. It is found that if the labels are known with certainty, then in the near-equilibrium limit the efficiency scales as \ , while if there is maximal uncertainty in the labels, then the average estimate for efficiency drops to \ . We also suggest how the inferred properties of the incomplete model can be mapped onto a model with complete information but with an additional source of thermodynamic irreversibility. (shrink)

Our concern is in explaining how and why models give us useful knowledge. We argue that if we are to understand how models function in the actual scientific practice the representational approach to models proves either misleading or too minimal. We propose turning from the representational approach to the artefactual, which implies also a new unit of analysis: the activity of modelling. Modelling, we suggest, could be approached as a specific practice in which concrete artefacts, i.e., models, are constructed with (...) the help of specific representational means and used in various ways, for example, for the purposes of scientific reasoning, theory construction and design of experiments and other artefacts. Furthermore, in this activity of modelling the model construction is intertwined with the construction of new phenomena, theoretical principles and new scientific concepts. We will illustrate these claims by studying the construction of the ideal heat engine by Sadi Carnot. (shrink)

Brillouin sees order as generated by tapping negentropy sources existing upstream, while Prigogine sees it as generated by dumping entropy downstream. Joining both ideas yields a picture of the computer closely paralleling that of Carnot's heat engine. The difference is that the one delivers information and the other, work. In either case the irretrievable (that is, by definition) loss occurs at the last step. Bennett and Landauer very rightly emphasize this, but their fixation on the condenser blinds them to (...) the necessity of the furnace; thus they are led to believe in the possibility of “perpetual duplication of the second kind,” which Brillouin explicitly denies. (shrink)

Costa de Beauregard has criticized the notion of reversible computation, invented by Charles Bennett and expounded by this author. Costa de Beauregard states that my work includes fantastic claims. This is a rebuttal.

The question of how the relationship between metaphysics and theology should be understood is one of the main topics of debate on the agenda of philosophers and theologians from Aristotle (d. 322 BCE) to Avicenna (d. 428/1037), from Avicenna to the late Islamic theological tradition, and even to medieval Jewish and Christian thought. Avicenna criticized Aristotle for identifying metaphysics with theology and presented a new perspective on the relationship between those two disciplines. He argues that God is not the subject (...) but the goal of metaphysics, in other words — metaphysics is an ontological science in terms of its subject matter and a theological science in terms of its goal. In Islamic thought after Avicenna, the relationship between metaphysics and kalam continued to be one of the most heated topics of debate. Trying to explain the relationship between those two disciplines, thinkers such as Imam al-Ghazali (d. 505/1111), Shams al-Din Samarqandi (d. 702/1303), and Sayyid Sharif al-Jurjani (d. 816/1413) made a distinction between “Islamic science and rational science” and argued that metaphysics is an intellectual science while kalam is a religious (Islamic) science. On the other hand, Siraj al-Din al-Urmawi (d. 682/1283), who dealt with the relationship between metaphysics and kalam in his treatise On the Difference between Metaphysics (God-Science) and Kalam, revised Avicenna’s approach and criticized theologians who tried to explain the problem in terms of the distinction between religious and rational sciences. The aim of this article is to analyze Avicenna’s and Urmawi’s views on the relationship between metaphysics and theology, taking into account the historical-problematic context of the issue. (shrink)

Summary James Watt (1736–1819) is best known as an engineer who dramatically improved the efficiency of the steam engine. What we take to be his chemical interests are conventionally seen as peripheral to his main line of work. He is usually treated as a chemist in three main contexts: his ‘practical’ chemical work relating to chlorine bleaching, varnishes, pottery, and so on; his work with Thomas Beddoes on the medicinal uses of various ‘airs’; his, much disputed, claim as a chemical (...) discoverer in the case of the composition of water. In this paper, I argue that Watt himself, and his contemporaries, saw the centrepiece of his steam engine work—the separate condenser—as a chemical invention. I also suggest more broadly that Watt understood the steam engine as a chemical device. For Watt and his Scottish friends, the study of steam and heat was a chemical enquiry. The subsequent changes in the place of heat in chemical enquiry in the early nineteenth century led to a reclassification of Watt's chemical investigations as ‘physics’. This, in turn, produced the sharp separation of his chemical and engineering activities characteristic of modern historiography. Watt's steam engine, which is usually placed in the lineage of machines understood as heat engines, and explained by the laws of thermodynamics, is better seen in context as a chemical device. Watt's ‘indicator diagram’ is reassessed in the light of this. (shrink)

Alsatian engineer Gustave-Adolphe Hirn is best known to historians of science for his experimental determination of the mechanical equivalent of heat, first published in 1855. Since the 1840s, that equivalent has been closely associated with the conservation of energy, indeed often conflated with it. Hirn was one of Thomas Kuhn’s twelve ‘pioneers’ whose work he deemed relevant to the ostensible ‘simultaneous discovery’ of energy conservation. Yet Hirn never wholeheartedly embraced energy conservation. After reviewing his experimental work, his philosophical reflections, (...) and his response to developments in heat theory, this article identifies three factors as having played central roles in this regard: Hirn’s deepest concerns were ontological, not energetic; none of the concepts basic to his natural philosophy were appropriate stand-ins for a quantitatively conserved energy; and, accurately reflecting the most common interpretation of the principle of the conservation of energy from the 1860s on – as exemplified already by Helmholtz in 1847 – Hirn associated its corpuscular-mechanical underpinning with the despiritualizing materialism he saw as dominating contemporary science. Hence although Hirn’s natural philosophy embraced sentiments quite in the spirit of the conservation of energy, he never explicitly subscribed to that principle. (shrink)

The mathematical model of physical problems interprets physical phenomena closely. This research work is focused on numerical solution of a nonlinear mathematical model of fractional Maxwell nanofluid with the finite difference element method. Addition of nanoparticles in base fluids such as water, sodium alginate, kerosene oil, and engine oil is observed, and velocity profile and heat transfer energy profile of solutions are investigated. The finite difference method involving the discretization of time and distance parameters is applied for numerical results (...) by using the Caputo time fractional operator. These results are plotted against different physical parameters under the effects of magnetic field. These results depicts that a slight decrease occurs for velocity for a high value of Reynolds number, while a small value of Re provides more dominant effects on velocity and temperature profile. It is observed that fractional parameters α and β show inverse behavior against u y, t and θ y, t. An increase in volumetric fraction of nanoparticles in base fluids decreases the temperature profile of fractional Maxwell nanofluids. Using mathematical software of MAPLE, codes are developed and executed to obtain these results. (shrink)

Cities and towns are expanding and thriving as a result of urbanization, which also significantly changes the local climate. One of the most significant phenomena associated with urbanization is the Urban Heat Island (UHI) effect. This phenomenon is increasingly being studied worldwide. The paper aims to investigate the UHI phenomenon in the metropolitan area of Tirana, Albania. It analyses the impact of the UHI on four specific locations in Tirana, its causes and mitigation measures, as well as variations in (...) surface temperature, CO2 emissions, and relative humidity. The regions are measured and observed using a specific instrument such as the Testo 435. Considering the mean surface temperature variations between urban and rural regions ranging from 28.4°C to 33.7 °C, CO2 emissions from 302.9 ppm to 416.2 ppm, and relative humidity from 34.1% to 41.2%, it is found that the UHI impact in Tirana is significant. The lack of green spaces, high building density, urban patterns, building materials used, transport, and energy use are the main contributors to the UHI in central Tirana. Increasing green spaces, using reflective materials, and promoting sustainable urban design are some of the mitigation techniques suggested to reduce the UHI effect in Tirana. (shrink)

Over the years, the urban heat vulnerability has evolved as a pressing global concern for researchers and policymakers alike. Numerous studies have aimed at mitigating the adverse effects of urban heat vulnerability on public health and safety. However, the critical task of selecting the most fitting indicator for urban heat islands in public spaces is not emphasized in the existing studies, considering the diverse indices available. Beyond identification, studies that delve into the prioritization of these indices and (...) the determination of optimal variables along with their respective weights are scanty. The present study attempts to address these gaps in urban heat vulnerability research through the lens of natural solutions. The study employs a fuzzy analytical hierarchy approach to ascertain the weights of selected criteria, providing a nuanced understanding of the multifaceted factors influencing their applicability. Real-time impact estimation using the fuzzy technique for order of preference by similarity to ideal solutions enhances the practicality of the findings. The results reveal a set of pivotal characteristics crucial for constructing a robust heat vulnerability index, facilitating the prioritization of selected criteria. The implementation of this hybrid methodology culminates in a streamlined, precise, and practical tool for evaluating heat vulnerability in hot urban public spaces. These findings contribute valuable insights to the academic discourse and offer a tangible resource for policymakers and practitioners. The proactive approach provides a roadmap for addressing impending challenges related to urban heat vulnerability, marking a positive step toward creating resilient and sustainable urban environments. (shrink)

The texts (and talk) of engineers take different forms. In this essay, I present and critique several texts written for different purposes and audiences but all intended to convey to the reader the technical details of whatever they are about—whether a textbook passage describing the fundamental behavior of an electrical component, a journal article about a mathematical technique intended for use in design optimization, a memo to co-workers within a firm about a heat transfer analysis of a remotely sited (...) building, or a general introduction to the field of? ergonomics? My aim is to explore how the ways in which engineers describe and document their problems and projects frame what they accept, display and profess as useful knowledge. In this I am particularly interested in how engineers envision the ‘users’ of, or participants in, their productions. Like science, engineering texts are written as if they were timeless and untainted by socio-cultural features. However, a technical treatise is not devoid of metaphor or creative rendering of events; there is always a narrative within which worldly data and instrumental logic is embedded—but it is a story in which the passive voice prevails, history is irrelevant, and the human actor or agent is painted in quantitative parameters fitting the occasion. Whether this rhetoric can be sustained in the face of challenges to traditional ways of doing engineering is an open question. (shrink)

This inclusive cross-cultural study rethinks the nexus between engineering education and context. In so doing the book offers a reflection on contextual boundaries with an overall boundary crossing ambition and juxtaposes important cases of critical participation within engineering education with sophisticated scholarly reflection on both opportunities and discontents. -/- Whether and in what way engineering education is or ought to be contextualized or de-contextualized is an object of heated debate among engineering educators. The uniqueness of this study is that this (...) debate is given comprehensive coverage – presenting both instrumentally inclined as well as radical positions on transforming engineering education. -/- In contextualizing engineering education, this book offers diverse commentary from a range of disciplinary, meta- and interdisciplinary perspectives on how cultural, professional, institutional and educational systems contexts shape histories, structural dynamics, ideologies and challenges as well as new pathways in engineering education. Topics addressed include examining engineering education in countries ranging from India to America, to racial and gender equity in engineering education and incorporating social awareness into the area. -/- Using context as “bridge” this book confronts engineering education head on. Contending engineering ideologies and corresponding views on context are juxtaposed with contending discourses of reform. The uniqueness of the book is that it brings together scholars from the humanities, the social sciences and engineering from Europe – both East and West – with the United States, China, Brazil, India and Australia. (shrink)

This introduction to physical science combines a rigorous discussion of scientific principles with sufficient historical background and philosophic interpretation to add a new dimension of interest to the accounts given in more conventional textbooks. It brings out the twofold character of physical science as an expanding body of verifiable knowledge and as an organized human activity whose goals and values are major factors in the revolutionary changes sweeping over the world today.Professor Kemble insists that to understand science one must understand (...) not only what the scientists have discovered, but how the discoveries were made, why the growth of scientific knowledge had to begin slowly, and what it has done to our habits of thought. He has written neither a history of science nor an introduction to the philosophy of science but an introduction to scientific concepts and principles that supplies as much of their historical and philosophical context as limits of space permit.The volume takes up in turn the story of the astronomy of ancient Greece, the Copernican revolution, the idea of the expanding sidereal universe, the rise of Newton's classical mechanics with its many astronomical applications, the concept of energy and its relation to heat, to steam engines, and to thermodynamics. The volume ends with an account of the successes and failures of classical kinetic-molecular theory of heat. (shrink)

This inclusive cross-cultural study rethinks the nexus between engineering education and context. In so doing the book offers a reflection on contextual boundaries with an overall boundary crossing ambition and juxtaposes important cases of critical participation within engineering education with sophisticated scholarly reflection on both opportunities and discontents. Whether, and in what way engineering education is or ought to be contextualized or de-contextualized is an object of heated debate among engineering educators. The uniqueness of this study is that this debate (...) is given comprehensive coverage - presenting both instrumentally inclined as well as radical positions on transforming engineering education. In contextualizing engineering education, this book offers diverse commentary from a range of disciplinary, meta- and interdisciplinary perspectives on how cultural, professional, institutional, and educational systems contexts shape histories, structural dynamics, ideologies and challenges as well as new pathways in engineering education. Topics addressed include examining engineering education in countries ranging from India to America, to racial and gender equity in engineering education and incorporating social awareness into the area. Using context as "bridge" this book confronts engineering education head on. Contending engineering ideologies and corresponding views on context are juxtaposed with contending discourses of reform. The uniqueness of the book is that it brings together scholars from the humanities, the social sciences and engineering from Europe - both East and West - with the United States, China, Brazil, India and Australia. (shrink)

In the years 2020–2021, journalists, lawyers, scholars, and civil society actors noticed an unusual spike in the refusal of francophone African immigrants in Québec, Canada. While Immigration, refugee and citizenship Canada’s systemic racism problem were already documented, the novelty appeared to be how standardized and sometimes, “nonsensical” the reasons given to many of the applicants were. This eventually prompted a lawsuit against IRCC in which it was revealed that a new piece of software called “Chinook” had been deployed since 2018, (...) approximately at the same time application refusal started spiking. Online and media-fueled speculations culminated in a broad debate about whether Chinook was an artificial intelligence-based technology. Such controversy, for instance, unfolded during parliamentary consultations in which it was finally disclosed that Chinook was not AI per se., but more of a half-baked automated interface. The present article aims to understand how the performative ambiguity of Chinook informs on the progressive becoming of the Canadian Federal state and its immigration control practices in the current Machine Learning hype. Furthermore, it seeks to understand how the interlacing of public–private partnership, in which the private sector is mobilized to produce AI-driven technology, recursively transforms the exercise of governance and governmentality. We argue, through the Chinook controversy and its unfolding, that there is a shift occurring where AI becomes ever more central in statecraft “anarchitecture” and cybernetic adaptability. (shrink)

Continued failure to limit emissions of carbon dioxide and other greenhouse gases that are causing global climate change has brought increased attention to climate engineering technologies, which actively modify the global environment to counteract heating and climate disruptions caused by elevated greenhouse gases. Some proposed forms of CE, particularly spraying reflective particles in the upper atmosphere to reduce incoming sunlight, can cool the average temperature of the Earth rapidly and cheaply, thereby substantially reducing climate-related risks. Yet CE interventions provide only (...) imperfect corrections for the climatic and other environmental effects of elevated greenhouse gases, and carry their own environmental risks. Moreover, they may also increase other risks, by weakening political support for essential emissions reductions or providing new triggers for international conflict. These technologies thus require international governance, but also pose novel and severe challenges to current international laws and institutions. Effective governance of CE will require a capacity to make decisions regarding the conditions, if any, under which specific interventions are authorized, plus realtime operational oversight of any interventions that are conducted. Decision processes must be effectively linked with scientific research and assessment, and with institutions to manage and respond to threats of CE-related conflict. We advance preliminary suggestions to address two priority areas for early investigation: how international cooperation on early CE research can help develop shared norms that can grow robust enough to support future decision needs; and how early research and development on CE can be made to complement and encourage, rather than undermine, parallel efforts to reduce climate risks by cutting emissions. (shrink)

In 2011, the Florida Keys Mosquito Control District’s proposed to release a genetically engineered Aedes aegypti mosquito to fight the spread of dengue fever and chikungunya. This would be the first release of a genetically engineered insect into the open environment in the US, and the proposal has sparked heated opposition in Key West. We address this controversy through Beck’s concept of reflexive modernity, tracing the way the FKMCD and Oxitec interpret the risk involved in the situation and how citizens (...) opposing the release construct their very different interpretation. We use theories of space and place and Rickert’s theory of ambient rhetoric to argue that the contrasting interpretations of risk in this case stem, at least in part, from the different construction of space and place embraced by the FKMCD and Oxitec and by many in the community. The authority of nature invoked by FKMCD and Oxitec’s scientific discourse frames the public forum in ways that exclude full deliberation and affective argumentative grounds that emerge from the materiality of place. While the public forum privileges what Latour calls matters of fact, the controversy emerges from different understanding of what Latour calls matters of concern. (shrink)

"Couched in the terminology of traditional physical chemistry, this book is accessible to chemists, engineers, materials scientists, mathematicians, mathematical biologists - indeed to anyone with a command of first year calculus.

William Thomson's image as a professional mathematical physicist who adheres, particularly in his work in classical thermodynamics, to a strict experimental basis for his science, avoids speculative hypotheses, and becomes renowned for his omission of philosophical declarations has been reinforced in varying degrees by those historians who have attempted, as either admirers or critics of Thomson, to describe and assess his life. J. G. Crowther, for example, sees him as a thinker of great intellectual strength, but deficient in intellectual taste; (...) a scientist aware only of his immediate work and without depth of vision. Not well read in the literature of the subjects of his research, Thomson is seen, moreover, as one whose achievements owe little to the work of others, and whose great personality ‘is an expression in the realm of ideas of the power and blindness of capitalism’, especially through ‘his view of the world in terms of engineering conceptions’. On the other hand, even Sir Joseph Larmor, for whom Thomson was nothing less than a hero, is to be found ascribing to him the epithet of pragmatist. (shrink)

Lazare Carnot was the unique example in the history of science of someone who inadvertently owed the scientific recognition he eventually achieved to earlier political prominence. He and his son Sadi produced work that derived from their training as engineers and went largely unnoticed by physicists for a generation or more, even though their respective work introduced concepts that proved fundamental when taken up later by other hands. There was, moreover, a filial as well as substantive relation between the work (...) of father and son. Sadi applied to the functioning of heat engines the analysis that his father had developed in his study of the operation of ordinary machines. Specifically, Sadi's idea of a reversible process originated in the use his father made of geometric motions in the analysis of machines in general. (shrink)

This book is an attempt to get to the bottom of an acute and perennial tension between our best scientific pictures of the fundamental physical structure of the world and our everyday empirical experience of it. The trouble is about the direction of time. The situation (very briefly) is that it is a consequence of almost every one of those fundamental scientific pictures--and that it is at the same time radically at odds with our common sense--that whatever can happen can (...) just as naturally happen backwards. Albert provides an unprecedentedly clear, lively, and systematic new account--in the context of a Newtonian-Mechanical picture of the world--of the ultimate origins of the statistical regularities we see around us, of the temporal irreversibility of the Second Law of Thermodynamics, of the asymmetries in our epistemic access to the past and the future, and of our conviction that by acting now we can affect the future but not the past. Then, in the final section of the book, he generalizes the Newtonian picture to the quantum-mechanical case and (most interestingly) suggests a very deep potential connection between the problem of the direction of time and the quantum-mechanical measurement problem. The book aims to be both an original contribution to the present scientific and philosophical understanding of these matters at the most advanced level, and something in the nature of an elementary textbook on the subject accessible to interested high-school students. Table of Contents: Preface 1. Time-Reversal Invariance 2. Thermodynamics 3. Statistical Mechanics 4. The Reversibility Objections and the Past-Hypothesis 5. The Scope of Thermodynamics 6. The Asymmetries of Knowledge and Intervention 7. Quantum Mechanics Appendix: Gedankenexperiments with Heat Engines Index Reviews of this book: The foundations of statistical mechanisms are often presented in physics textbooks in a rather obscure and confused way. By challenging common ways of thinking about this subject, Time and Chance can do quite a lot to improve this situation. --Jean Bricmont, Science Albert is perfecting a style of foundational analysis that is uniquely his own...It has a surgical precision...and it is ruthless with pretensions. The foundations of thermodynamics is a topic that has accumulated a good deal of dead wood; this is a fire that will burn and burn. --Simon W. Saunders, Oxford University As usual with Albert's work, the exposition is brisk and to the point, and exceptionally clear...The book will be an extremely valuable contribution to the literature on the subject of philosophical issues in thermodynamics and statistical mechanics, a literature which has been thin on the ground but is now growing as it deserves to. --Lawrence Sklar, University of Michigan. (shrink)

When Sadi Carnot carried out the pioneering work on heat engines which led to the second law of thermodynamics, he contemplated an ideal heat engine, one that was completely reversible. Carnot's use of idealization was particularly successful ‐ while the ideal engine cannot actually be constructed, the conclusions he derived for the ideal engine hold a fortiori for actual heat engines. For example, the greater the temperature difference between the two heat reservoirs, the higher (...) the engine's efficiency. But this is not always the case. What holds true in the ideal limit may be false in reality. Nevertheless, the ideal case, simple and tractable, can be expected to shed light on actual cases, the precise treatment of which is impossible or impractical. Idealizations abound in science: ideal gases, closed systems, perfectly rational agents, and evolutionarily stable strategies. Indeed, thinkers as diverse in their outlook as Edmund Husserl and Albert Einstein have pointed to idealizations as the hallmark of modern science. (shrink)

This paper considers combinations of frictionless mechanical amplifiers arranged in a cycle so that the amplified signal passes around through an endless chain of such systems the output of the last system being fed into the first. It appears that while each amplifier may be reversible in the absence of friction, the effect of the combination is such that the signal would be unable to pass around the cycle indefinitely, using the same energy over and over again. It is felt (...) that the assumptions upon which this cycle is based are related to some of the conditions met with in consideration of open thermodynamic systems such as heat engines and living organisms when in finite environments. (shrink)

We set out by noting the preference for circular flows in ecological thought, and the related abhorrence of inefficiency and waste that Western ecology shares with mainstream economic thinking. This has often been manifest in a shared disdain both for uncontained, free-burning fire and for ‘unmanaged’ sexual desire. The paper constructs a ‘pyrosexual’ counter-narrative that explores the mutually constitutive and generative implication of sex and fire. Bringing together the solar ecology of Georges Bataille, feminist and queer thinking about sexuality and (...) reproduction, and a range of ways of theorising biological life and fire, we explore how fire mediates between organismic desire and the energetic dynamics of the earth and solar system. The first section takes a genealogical approach to fire and sex that traces their entanglement from the initial ‘assembling’ of fire through to the emergence of a fire-handling creature. The second section looks at how fire has been contained and intensified by human actors, and the role that heat-driven transformations of inorganic matter have played in the incitement and channeling of desire in urban spaces. The third section addresses the development of industrial ‘heat engines’ and the implications for desire and reproduction of tapping vast reservoirs of subterranean solar energy. We round off by beginning to consider what alternative possibilities might lie in the renegotiation of sex and fire on a planet undergoing rapid change. (shrink)

A new way of understanding entropy as a macroscopic property is presented. This is based on the fact that heat flows from a hot body to a cold one even when the hot one is smaller and has less energy. A quantity that determines the direction of flow is shown to be the increment of heat gained divided by the absolute temperature. The same quantity is shown to determine the direction of other processes taking place in isolated systems (...) provided that q is determined by the state of the system. Entropy emerges as the potent energy of a system [Σ], the potency being determined by 1/T. This is shown to tie in with the statistical mechanical interpretation of entropy. The treatment is shorter than the traditional one based on heat engines. (shrink)

In this paper we give a full account of the work of William Thomson on absolute temperature, which to this day provides the theoretical underpinnings for the most rigorous measurements of temperature. When Thomson fashioned his concepts of ‘absolute’ temperature, his main concern was to make the definition of temperature independent of the properties of particular thermometric substances . He tried out a succession of definitions based on the thermodynamics of ideal heat engines; most notably, in 1854 he (...) gave the ratio of two temperatures as the ratio of quantities of heat taken in and given out at those temperatures in a Carnot cycle. But there were difficulties with using such definitions for experimental work, since it was not possible even to approximate an ideal Carnot engine in reality. More generally, it is not trivial to connect an abstract concept with concrete operations in order to make physical measurements possible. In the end, Thomson argued that an ideal gas thermometer would indicate his absolute temperature, and that the deviation of actual gas thermometers from the ideal could be estimated by means of the Joule‐Thomson effect. However, the measurement of the Joule‐Thomson effect itself required measurements of temperature, so there was a problem of circularity. (shrink)

Sadi Carnot’s 1824 Reflections on the Motive Power of Fire created the new science of thermodynamics. It succeeded in its audacious goal of finding a very general theory of the efficiency of heat engines, by introducing and exploiting the strange and unexpected notion of a thermodynamically reversible process. The notion is internally contradictory. It requires the states of these processes to be both in unchanging equilibrium, with a perfect balance of driving forces, while also changing. The work of (...) Sadi’s father, Lazare Carnot, on the efficiency of ordinary machines provided Sadi with a template of a very general theory of the efficiency of ordinary machines; and a characterization of the most efficient processes in them as those that minimize differences of driving forces and can be run in reverse. Lazare’s work could provide these resources because of its choice of a dissipative ontology of inelastic collisions among hard bodies. This historically ill-fated choice meant that Lazare’s machines were analogous to Sadi’s heat engines in their key aspects: they are built from essentially dissipative processes. Lazare’s strategies for controlling dissipation and optimizing his machines were transferrable to the analogous problems Sadi found in heat engines. The unanswerable historical question is whether Sadi would have sought a general theory of heat engines at all or found these general theoretical devices without the template provided in analogy by the prior work of Lazare. (shrink)

Nanotechnology seems to be a new “key-discipline”, which should lead to basic changes in many areas of living and producing. This estimation is questioned by a comparison with established technologies, which reach from heat engines to biotechnology. In this line it is possible to come to a more realistically assessment of nanotechnology. “Technologies” in the narrower sense are understood as techniques based scientifically and integrated systematically into a network. The development of these technologies starts first in the early (...) modern times. Before this background the established technologies are characterised looking at relevant questions and problems, the role of researchers and inventors, the importance of theoretical foundations, important applications and innovations, as well as the relevance of visions and then confronted with nanotechnology in its present state. It is accentuated that there are no explicit theories and no specific applications of nanotechnology and it seems to be only a kind of chemical technology. (shrink)

It is shown that a number of questions, usually considered philosophical rather than scientific, can be reformulated to apply to a world of automata or "well-informed heat engines." In some cases they admit of physical answers, but in many cases obtaining answers entails violation of the second law of thermodynamics. This is demonstrated explicitly for the problem of determinism and free will, for the discovery of the origin or ultimate fate of the universe, or for the discovery of (...) causes or purposes in nature. (shrink)

It is inherent in the process of producing mechanical and hence electrical energy from a heat engine that much of the energy input is released as relatively low temperature heat. By various techniques it is possible to produce reject heat at a temperature useful for space heating or industrial process heating, giving a much higher overall efficiency of conversion and saving fuel over separate production of electricity and heat. Heat from combined heat and power (...) plant, or from another central source, can be piped in the form of hot water or steam to users' premises, in district heating networks. (shrink)

Molecular imprints of organisms serving as both the agents and the products of the underlying sign activities are quantum mechanical in their origins. In particular, molecules in any reaction networks constituting a biological organism are semiotic or context-dependent in the sense that their activities reside within the proper coordination of the entire networks. The origin of life could have been related to a specific aspect of molecular semiotics, especially in the transition from molecules as the physical symbols of material units (...) to molecules as the semiotic signs having the capacity of pointing to something else other than the molecules themselves. Quantum mechanical underpinning of the molecular imprints leading to the emergence of life is in the appraisal of the material capacities of both coherent assimilation and decoherent dissociation already latent in the imprints. One empirical evidence suggesting the likelihood of both coherent assimilation and decoherent dissociation in prebiotic settings could have been found in synthetic chemical reactions running in hydrothermal circulation of seawater through hot vents in the Haedean ocean on the primitive Earth. (shrink)

The bioclimatic architecture is still fascinating to all of us. The lack of energy that the world is facing nowadays is forcing architects and engineers to implement smart solutions benefiting at the maximum from nature itself without considering the primary sources of energy that the world is actually using. Bioclimatic design has the roots in history, despite the fact that little attention has been paid to it throughout history. It is important to understand how natural systems operates, creating closed or (...) semi-closed systems that mirror the ecological systems on Earth. The components of bioclimatic design deal mostly with: climate type and requirements; adaptive thermal comfort; vernacular and contextual solutions; tools and assessment methods; microclimate; sun path; wind; rain; passive and active systems and responsive forms. The aim of the bioclimatic design is to improve the natural environment through the utilization of clean energy and renewable energy system; to reduce the need for energy for heating purposes; and to reduce the energy for cooling proposes, air conditioning and lighting. Furthermore, bioclimatic design involves changes in regulation, improves the house comfort, and also improves urban quality of life. Bioclimatic buildings also include the use of building elements such as walls, windows, roofs, and floors, in order to collect, store, and distribute solar thermal energy and to prevent overheating. The aim is to manage the energy flows providing comfortable conditions during the entire year and the entire day. Minimization of thermal losses and utilization of climatic conditions (climate; microclimate, sunrise) are other important issues to consider. According to many studies, the best orientation for a building in order to maximize the heat gain during winter is east–west and the primary façade should face south. Sustainability is mostly an outcome, rather than a goal or a process. The aim of all designers is to reduce the ecological footprints and to improve the quality of life. The energy sustainability and the use of natural resources must be an integral part of a sustainable development. Nowadays, there are softwares that are developed in order to carry out environmental assessment tools and standards, in order to draw conclusions about internal thermal comfort; uncomfortable times in the building during the entire year; the need for shading devices and their dimensions; energy use, energy cost, etc. Simulations are essential in the design process. Examples chosen as case studies participate to have a better insight into the overall approach of the bioclimatic design. Applying the principles of bioclimatic design remains still a challenge in redefining the perfect bioclimatic house. (shrink)

This paper investigates the magnet as a classic “boundary object” of modern technoscientific culture. Equally at home in the nursery, dynamo, measuring instrument and navigational compass, its capricious performance nevertheless persistently eluded the powers of nineteenth century electromagnetic expertise in pursuit of the completely “permanent” magnet. Instead the untamed magnet’s resilient secularity required its makers to draw upon ancient techniques of chemical manipulation, heat treatment and maturation to render it eventually sufficiently stable in behaviour for orderly use in modern (...) engineering. The precise methods for accomplishing this quasi-permanence were typically protected by trade secrecy – until that is Marie Sklodowska Curie’s first research publication opened up this topic for rigorous comparative research in 1898. Nevertheless, over the next quarter century her work in this field was gradually eclipsed by heavily gendered citation practices, just as the futility of attempting to accomplish complete permanency in magnets was eventually established by Sydney Evershed in the 1920s. (shrink)

As the poet T.S. Eliot said, 'Where is the wisdom lost in knowledge? Where is the knowledge lost in information?' Our postmodern 'information culture' forces us to be over-cerebral, but it doesn't teach us to think; consequently it becomes nearly impossible for us to imagine a knowledge that is beyond information, much less a Wisdom that is beyond knowledge. We all know what it is to uselessly 'spin our wheels' in barren thought and fantasy; certain valid contemplative disciplines even have (...) as their main goal the pacification of the 'monkey mind', the over-heated brain that prevents us from genuinely living our lives, from being fully present to the world, to each other, and to ourselves. But such pacification can also have a nihilistic side to it. It can subtly fool us into believing that the pursuit of meaning, the attainment of intellectual stability and certainty, is neither possible or desirable - a belief that is of great use to the political and economic Powers That Be in the emerging global society, who are always delighted to hear people express the opinion that there is no such thing as objective Truth, that we can't really know what is real, or if anything is real, beyond our own subjective experience. To the degree that the people start to believe that nothing can be known (our hidden masters reason), they will stop asking embarrassing and inconvenient questions. The notion of objective truth - not to mention Absolute truth - immediately suggests oppression, tyranny and fanaticism to the postmodern mind. Why? Because we have been systematically taught to see things this way by those Social Engineers who construct and impose the terms by which Reality is to be viewed. In order to break free from this socially-imposed subjectivism, we need to remember that Reality is not something determined by belief, but rather that belief is only true when it conforms itself to Reality. If we see nothing beyond this material/social world, we will be forced to take our own subjectivity as the only way to awaken from the social trance, and so fall even more deeply into that very trance, which is precisely a collective subjectivity. But if we know Objective Truth as metaphysical, beyond material nature and human society, then we have begun to catch a glimpse of the One Way Out. The traditional notion of Knowledge maintains that, 1) Truth can be known with certainty, and, 2) that the reason for knowing Truth is to transform our lives from a state of chaotic uncertainty, vulnerable to all the suffering that illusion and impermanence can produce, into one of eternal certainty and stability, where the knower becomes one with the Thing known - a state that goes by the name of bliss. To begin the path toward this bliss, however, we will need to know how to know; and this requires, as the necessary first step, that we know how to take knowledge seriously. As metaphysician Frithjof Schuon put it: 'Knowledge only saves us on condition that it enlists all that we are, only when it is a way and when it works and transforms and wounds our nature, even as the plough wounds the soil'. The shifting illusions of individual and collective subjectivity cannot protect us, and will always betray us. But if we are firmly rooted in that Truth which, in the words of Lew Welch, 'goes on whether we look at it or not', then we have a Protector - one Who is always there, upon Whom we can always rely, and to Whom we can always turn, when we can no longer remedy or deny or escape from the suffering and insecurity of conditional life. So let's begin. (shrink)

The bases of tenets of the World came from the East; Pythagoras learnt all there up the 26 years. At a home, the east ideas where took in no; then he bound the mathematics with the elements of matter. This was the best way to a blood feud of the all Humanity. The 17th age gave the bases of mathematics and the Greek atomism; this had led to the paranoia in all sciences. The LCE was brought in 19th age with (...) bases no; really it was the box of Pandora in the form of wrong sciences of the Nature. The wise revenge of Pythagoras was in the form of riddle for the best thinkers in the World in all times; us solved one in the 50th years. A base of the World is of the material space (MS) with praatoms (PAs) Ao; they are of the affinity to matter. A density of the MS is of ~ 5.10‐6 kg/m3 close to the Ears. PA Ao is of quant of matter and antimatter; they are of rotate in the different sides. All matter takes up Ao and to grow. In the giant stars to go the bursts giving Ao, or caloric. The matter of being in the World on base of the key law of conservation of heat (caloric) and matter by loss of energy; it is main. Leibniz offered to the conservation of mv2 in the World. But Newton knew that any move is damped, and it need in filled up. This the author proved by tests over the 300 years just. D.Bernoulli given to the model of gas. I. Kant proved that mv2 is the quantity of heat by stop of the body; it is no the energy! A key leitmotiv of thought is blocked the grasp of facts if ones not leaded to an accepted concept. P. Mayer had the blunder in base of the LCE; a work of gas expansion in Torricelli tube is equal nil strong! This is the gross blunder of a sick paranoiac! The 21 age gave up a new philosophy and a way to endless engine. The super skills from ideal quartz with moving jaws to respond to the all new philosophy and sciences. (shrink)

This article deals with the emigration and the experiences of the professional group of engineers in their British exile, trying to evaluate the influences these refugee engineers had on the British engineering science. The approach is not limited to engineering research at universities or technical colleges, but tries to include the aspect of research and development on the level of the firm. Limits and constraints of gaining influence in British engineering are discussed, such as different values and traditions as well (...) as the different traditions in technical education and the role of the engineering graduate in industry. Finally attempts are made to establish some fields of engineering where an identifiable influence can be traced without exaggerating the general influence of these German speaking refugee engineers. Those identifiable fields are machine tools, fuel technology and district heating. (shrink)

Biometric technologies are becoming more pervasive in the workplace, augmenting managerial processes such as hiring, monitoring and terminating employees. Until recently, these devices consisted mainly of GPS tools that track location, software that scrutinizes browser activity and keyboard strokes, and heat/motion sensors that monitor workstation presence. Today, however, a new generation of biometric devices has emerged that can sense, read, monitor and evaluate the affective state of a worker. More popularly known by its commercial moniker, Emotional AI, the technology (...) stems from advancements in affective computing. But whereas previous generations of biometric monitoring targeted the exterior physical body of the worker, concurrent with the writings of Foucault and Hardt, we argue that emotion-recognition tools signal a far more invasive disciplinary gaze that exposes and makes vulnerable the inner regions of the worker-self. Our paper explores attitudes towards empathic surveillance by analyzing a survey of 1015 responses of future job-seekers from 48 countries with Bayesian statistics. Our findings reveal affect tools, left unregulated in the workplace, may lead to heightened stress and anxiety among disadvantaged ethnicities, gender and income class. We also discuss a stark cross-cultural discrepancy whereby East Asians, compared to Western subjects, are more likely to profess a trusting attitude toward EAI-enabled automated management. While this emerging technology is driven by neoliberal incentives to optimize the worksite and increase productivity, ultimately, empathic surveillance may create more problems in terms of algorithmic bias, opaque decisionism, and the erosion of employment relations. Thus, this paper nuances and extends emerging literature on emotion-sensing technologies in the workplace, particularly through its highly original cross-cultural study. (shrink)

As the Panama Canal approached its fiftieth anniversary in the mid-1960s, U.S. officials concerned about the costs of modernization welcomed the technology of peaceful nuclear excavation to create a new waterway at sea level. Biologists seeking a share of the funds slated for radiological-safety studies called attention to another potential effect which they deemed of far greater ecological and evolutionary magnitude – marine species exchange, an obscure environmental issue that required the expertise of underresourced life scientists. An enterprising endeavor to (...) support Smithsonian naturalists, especially marine biologists at the Smithsonian Tropical Research Institute in Panama, wound up sparking heated debates – between biologists and engineers about the oceans’ biological integrity and among scientists about whether the megaproject represented a research opportunity or environmental threat. A National Academy of Sciences panel chaired by Ernst Mayr failed to attract congressional funding for its 10-year baseline research program, but did create a stir in the scientific and mainstream press about the ecological threats that the sea-level canal might unleash upon the Atlantic and Pacific. This paper examines how the proposed megaproject sparked a scientific and political conversation about the risks of mixing the oceans at a time when many members of the scientific and engineering communities still viewed the seas as impervious to human-facilitated change. (shrink)

Instead of relying on the usual price elasticity technique, this book combines economic and engineering analysis to study economic growth and energy demands to the year 2000. It asserts that future energy demand will be determined by two basic factors--the gross national product and the efficiency with which energy is used to produce this output in the household, commercial, industrial, and transport sectors of the economy.Labor hours multiplied by a productivity factor results in the GNP. This study predicts that, in (...) the long run, productivity in the United States will recover most of the sharp losses registered in the past five years. The study points out the decelerating population growth, the higher number of women in the labor force, and new investments as having an influence on this situation.After projecting the size and composition of each of the four energy consuming sectors that account for the total GNP. Energy and Economic Growth estimates efficiency improvements for each. It shows, for example, that higher levels of thermal insulation will reduce sharply energy needs for household heating and cooling. Similarly, the study notes that improvements in energy consumption per dollar of output can be made for each of the energy intensive manufacturing industries, nothing that although the savings in energy are significant, none is a consequence of pushing improvements to known technological limits. Finally, the book establishes the price elasticities that are inherent in the calculated energy requirements and checks these against elasticity estimates made by other researchers. (shrink)

It is only when mixing two or more pure substances along a reversible path that the entropy of the mixing can be made physically manifest. It is not, in this case, a mere mathematical artifact. This mixing requires a process of successive stages. In any finite number of stages, the external manifestation of the entropy change, as a definite and measurable quantity of heat, isa fully continuous function of the relevant variables. It is only at an infinite and unattainable (...) limit thata non-uniform convergence occurs. And this occurs when considered in terms of the number of stages together with a distinguishability parameter appropriate to the particular device which is used to achieve reversibility. These considerations, which are of technological interest to chemical engineers, resolve a paradox derived in chemical theory called Gibbs'' Paradox. (shrink)

Smart cities build on the idea of collecting data about the city in order for city administration to be operated more efficiently. Within a research project gathering an interdisciplinary team of researchers – engineers, designers, gender scholars and human geographers – we have been working together using participatory design approaches to explore how paying attention to the diversity of human needs may contribute to making urban spaces comfortable and safe for more people. The project team has deployed sensors collecting data (...) on air quality, sound and mobility in a smart city testbed in Norrköping, Sweden. While these sensors are meant to capture an accurate ‘map’ of the street and what is going on along it, our interdisciplinary conversations around the sensors have revealed the heterogeneity both of smart city planning and spatial formulations of the city. The discussions have given rise to questions regarding the work that goes into constructing the sensor box itself, as well as the work of deploying it, and how these influence the ‘map’ that the sensors produce. In this paper, we draw on Lefebvre to explore how the sensors themselves produce smart spaces. We analyze how the box depends on perceived space to function (e.g. requiring electricity), and simultaneously it produces conceptualizations of space that are influenced by the materiality of the box itself (e.g. sensors being affected by heat and noise). Further, we explore how the (in)visibility of sensor technology influences lived space. (shrink)

Lloyd Berkner , radio engineer and ionospheric physicist, was among a small circle of power brokers who helped bring American science and the American state closer together during World War II and the early years of the Cold War. In this exemplary biographical study, Allan Needell, a historian at the Smithsonian Institution's National Air and Space Museum, gives a well‐documented account of Berkner's life and career and a nuanced examination of how American scientists and engineers defined and balanced the interests (...) of their professions and of the national security state during those crucial years.A product of the Midwest prairie, Berkner was an accomplished radio operator before entering the University of Minnesota to study electrical engineering and to train as a Naval Reserve aviator. The Bureau of Standards hired Berkner as a radio engineer in 1928, just in time for him to participate in Richard Byrd's highly publicized Antarctic expedition. The adventure helped form what Needell calls Berkner's “technocratic vision” that justified science both as a heroic exploration of the unknown and as a prime mover of technology and human progress. Berkner energetically pursued this vision of science, first at the Bureau of Standards and then at the Carnegie Institution of Washington , where he directed internationally respected research on ionospheric physics.World War II honed Berkner's skills in instrument building and organization. On active duty he served as the naval liaison at the MIT Rad Lab to produce radars and helped install them on naval aircraft. He also came into close contact with Vannevar Bush, I. I. Rabi, Jerome Wiesner, and other influential scientists who shared his enthusiasm for collaboration with the military. A rising star at the end of World War II, Berkner worked to build a science‐state partnership for the ensuing Cold War, which he saw as a continuation of the struggle between democracy and dictatorship.Berkner helped bring scientific expertise to bear on American defense and foreign policy in the 1940s and 1950s as executive secretary of the military's Joint Research and Development Board and as a consultant to the State Department and the CIA. He drafted the famous “Berkner report” on science and American foreign policy, directed Project Troy on the overseas operations of the Voice of America, and participated in the heated debate over continental defense against a possible Soviet nuclear attack. Berkner's election to the National Academy of Sciences in 1948, despite the lack of an advanced degree, undoubtedly aided his agenda, as did his assuming in 1951 the presidency of the Associated Universities, Inc. .In the 1950s, Berkner helped initiate the International Geophysical Year , which led to the launching of the Soviet Sputnik in 1957. Did Berkner propose the satellite component of the IGY as a cover for U.S. satellite intelligence programs? Needell finds no smoking gun but presents strong circumstantial evidence that intelligence was indeed a factor in Berkner's thinking. The connection apparently posed no moral challenge for Berkner, who maintained an abiding faith in the harmonious goals of American science and state—what he called the “unity of democracy.” Not everyone shared Berkner's faith, however. The geophysicist Merle Tuve, Berkner's boss at Carnegie, for example, feared government control of science and fought against Berkner both at the CIW and in national science policy. In the end, Needell sees Berkner as a kind of broker who brought American scientists together with the state through both strategies of insulation and overt integration of interests and action.Based on rich archival sources, Science, Cold War, and the American State is a superb social and political study of American science and technology rendered through Lloyd Berkner's life and times. Needell writes with clarity and achieves a nice balance between narrative and contextual analysis, which makes the book suitable for teaching courses. For scholars, the study raises fascinating questions for further research. One wonders, for example, to what extent Needell's intriguing hypothesis—that Berkner's activism derived from his nonacademic background—can be applied to other scientist‐statesmen. Above all, the book's focus on the ease with which Berkner moved between the worlds of science, government, and national security points to the need to reformulate the well‐known debate between the historians Paul Forman and Daniel Kevles over who was using whom in the U.S. science‐state relationship during the Cold War. Neither the science nor state community was monolithic, and further comparative studies of mediators on the scene such as Berkner should help deepen our understanding of the dynamics of that partnership. (shrink)

Ultrasonic excitation has been widely used in the detection of microcracks on metal surfaces, but there are problems such as poor excitation effect of ultrasonic pulse, long time to reach the best excitation, and difficult to find microcracks. In this paper, an adaptive ultrasonic pulse excitation device and infrared thermal imaging technology have been combined, as well as their control method, to solve the problem. The adaptive ultrasonic pulse excitation device adds intelligent modules to realize automatic adjustment of detection parameters, (...) which can quickly obtain reliable excitation; the multidegree-of-freedom base realizes the three-dimensional direction change of the ultrasonic gun to adapt to different excitation occasions. When the appropriate ultrasonic excitation makes microcracks in the resonance state, the microcracks can be frictionated, which produce heat rise with the temperature. Then, the microcrack defect can be detected by the infrared thermal instrument through the different surface temperatures with imaging recognition method. Our detection experiments of the titanium alloy plates and the aluminum alloy profiles of marine engineering show that the method can get reliable detection parameters in a short time and measure the crack length effectively. It can be used in many aspects such as crack detection in mechanical structures or complex equipment operating conditions and industrial production processes. (shrink)

While debate is heating up regarding the development of AI and its perceived impacts on human society, policymaking is struggling to catch up with the demand to exercise some regulatory control over its rapid advancement. This paper aims to introduce the concept of entangled AI that emerged from participatory backcasting research with an AI expert panel. The concept of entanglement has been adapted from quantum physics to effectively capture the envisioned form of artificial intelligence in which a strong interconnectedness between (...) AI, humans, society, and nature is reflected. Entanglement assumes that AI should serve nature, social well-being, justice, and the resilience of this intertwined network simultaneously and promote a dynamic balance among these factors. This approach allows us to understand the pervasive role of this technology and the scope of human agency in its development. The study shows how such concepts seem to transcend the dominant discourses related to expectations, technological determinism, and humanism. An additional aim of this paper is to demonstrate how backcasting can contribute to generating useful understandings of the future of AI and fruitful insights for policymaking. (shrink)

Ultra-high-performance concrete (UHPC) is gaining popularity due to its superior mechanical properties, including high strength, toughness, durability, and excellent seismic performance. However, the risk of explosive spalling in UHPC structures exposed to fire poses a significant challenge, fundamentally hindering comprehensive studies on fire safety and limiting the broader engineering applications of UHPC. In this study, the mixture proportion of UHPC was developed and optimized by comparing the usage of yellow river and standard sands, different types of chemical admixtures, and different (...) curing regimes. Furthermore, a sensitive case study was also conducted to optimize the calcined bauxite content to improve UHPC's fire resistance. For these purposes, 189 UHPC cubes, incorporating variations in particle types, superplasticizer types, and curing regimes, were tested under three thermal levels, such as 200℃,400℃, and 600℃. The microstructural evolution of heated cube specimens was then observed using a scanning electron microscope (SEM) examination. Calcined bauxite was then considered to replace the standard sand to improve the fire resistance of UHPC and enhance the residual compressive strength of cube specimens under thermal conditions. For this purpose, 0%, 20%, 40%, 60%, 80%, and 100% calcined bauxite content was designed as six case studies. Furthermore, the degradation of UHPC strength was also investigated for the corresponding six case studies by conducting the uniaxial compressive experiments. Finally, the microstructural evolution under both thermal conditions and calcined bauxite content was observed and discussed. (shrink)