This short essay presents a critical cartography of the critical new materialist notion and methodology of diffraction.

Putting the New Materialist figure of diffraction to use in a set of readings – in which cultural texts are materially read against their contents and their themes, against their readers or against other texts – this volume proposes a critical intervention into the practice of reading itself.

Re-turning to our experiences of putting a diffractive methodology to work ourselves, as well as engaging with the writings of Donna Haraway and Karen Barad, we produce some propositions re...

This essay focuses on the possibility of adopting a representational approach for technoscience, in which representation is considered as a situated process of dynamic “intra-action” (Barad 2007 ). Re-elaborating the recent critiques of representationalism (Thrift 2008 ), my analysis begins by analysing Hayles’s situated model of representation from an early essay where she explains her definition of constrained constructivism (Hayles [ 1991 ] 1997). The essay then discusses the notions of figuration and diffraction and the way they are employed (...) by Haraway in many of her writings for her critique of technoscience (Haraway 1991 , 1997 ). Finally, after considering diffraction through Barad’s reading of this practice in the context of her theory of agential realism ( 2007 ), it shows the links that relate constrained constructivism, situated knowledge and agential realism, and the way all of them work at “diffract[ing] the rays of technoscience” (Haraway 1997 : 16) through an alternative representational practice. (shrink)

Humans are living in damaged landscapes within a new geographical epoch known as the Anthropocene. The COVID-19 outbreak fuels uncertainty, instability, and ambiguity for humans. This viral disaster has been blamed for losing and further exacerbating ecological imbalance, and prompts a need to re-examine multispecies relations and, in particular, human exceptionalism. The authors, by applying a new theoretical assemblage that brings the new materialist turn entangled with Buddhist philosophies into our stories and diffractions of child-virus bodies, have been prompted to (...) raise two questions about how multispecies justice could disrupt environmental sustainability education. The questions we will engage with in the paper include: Can we explore these new theoretical assemblages (east-west) with child-virus relations as a means for raising multispecies justice that critiques the universalisation of human forces in the Anthropocene? What possibilities does the pandemic offer to rethink multispecies relations as an entangled ecological crisis by exploring what a ‘new normal’ in post-COVID-19 sustainability education could emerge? (shrink)

This article explores the possibilities of considering how ‘matter and meaning are mutually constituted’ in the production of knowledge (Barad, 2007: 152) through presenting a diffractive analysis of a piece of interview data with a six-year-old boy in a preschool class. Inspired by Donna Haraway’s (1997) and Karen Barad’s (2007) theorising, I understand diffractive analysis as an embodied engagement with the materiality of research data: a becoming-with the data as researcher. Understanding the body as a space of transit, a series (...) of open-ended systems in interaction with the material-discursive ‘environment’, diffractive analyses constitute transcorporeal engagements with data. Stacy Alaimo’s (2010) theorisation of the transcorporeal is put to work diffractively with Gilles Deleuze and Felix Guattari’s (1987) thinking on the process of becoming minor or minoritarian. This implies a reconceptualisation of the very act of thinking as a transcorporeal process of engagement, going beyond the idea of reflexivity and interpretation as inner mental activities taking place in the mind of the researcher understood as separated from the data. Through my example, I argue that diffractive analysis can make visible new kinds of material-discursive realities that can have transformative and political consequences. (shrink)

The current neurosciences contribute to the construction of gender/sex to a high degree. Moreover, the subject of gender/sex differences in cognitive abilities attracts an immense public interest. At the same time, the entanglement of gender and science has been shown in many theoretical and empirical analyses. Although the body of literature is very extensive and differentiated with regards to the dimensions of ‘neuroscience of gender’ and ‘gender in neuroscience’, the feeding back of these findings into the field of neuroscience remains (...) a desideratum. Especially, the question of how gender knowledge, i.e. insights from feminist theory on gender/sex and from gender and science studies on knowledge production, may be integrated and applied within the neurosciences has been strongly neglected. Presumably due to their epistemic culture and epistemological presuppositions, these critical engagements are conceived as externalist by critical scholars and neuroscientists alike. In this context, the question arises of how substantiated gender knowledge may be accounted for in neuroscientific research practice? The article outlines methodological considerations for a critical research agenda in the cognitive neurosciences. I present thoughts on how insights and expertise from gender and science studies can be taken into account in the neuroscientific practice of knowledge production. Starting from the assumption that changes in neuroscientific research practices are possible, my aim is to point out possibilities of integrating gender knowledge into the neurosciences. (shrink)

ABSTRACT During a visit to Europe in the autumn of 1882, Henry Augustus Rowland, Professor of Physics at Johns Hopkins University, displayed diffraction gratings produced on a ruling engine he had designed and built, which were bigger and much higher quality than any previously made. Some were of a novel type, ruled on concave surfaces, which he used in a simple but equally novel spectroscope that he had devised, to reveal spectral lines in great detail, and by means of (...) photography to record spectral data much more rapidly than previously possible. Over about twenty years Rowland built three ruling engines, published photographic maps of the solar spectrum, compiled a catalogue of the wavelengths of lines in the solar spectrum correlated with laboratory-produced spectra of almost all the chemical elements, and produced and sold the diffraction gratings used by spectroscopists everywhere. For decades after his death Rowland’s ruling engines remained practically the only source of good-quality diffraction gratings. This paper describes and analyses this work of Rowland and of the other men, Theodore Schneider, John Brashear, and Lewis Jewell, who played major roles in it. (shrink)

The first electron back-scattered diffraction Kikuchi patterns and grain orientation maps were captured for pure n -phase Ce. The sample preparation technique used for electron back-scattered diffraction orientation mapping of this surface-reactive metal included ion sputtering the surface using a scanning Auger microprobe followed by vacuum transfer of the sample from the scanning Auger microprobe to the scanning electron microscope. The effect of ion sputtering on the microstructure as well as preliminary electron back-scattered diffraction microstructural characterization is (...) presented. Based on the sputtering data, the room-temperature diffusivity of O in n -Ce was estimated. (shrink)

Kirchhoff’s diffraction theory is introduced as a new case study in the realism debate. The theory is extremely successful despite being both inconsistent and not even approximately true. Some habitual realist proclamations simply cannot be maintained in the face of Kirchhoff’s theory, as the realist is forced to acknowledge that theoretical success can in some circumstances be explained in terms other than truth. The idiosyncrasy (or otherwise) of Kirchhoff’s case is considered.

ABSTRACTDiffraction gratings are famously associated with Henry Rowland of Johns Hopkins University but there were precursors. Although gratings were first made and used in Europe, reliable machines for ruling gratings were developed in the USA, and two men, Lewis Rutherfurd and William Rogers, tackled the problem before Rowland. Rutherfurd, a wealthy independent astronomer, designed and built the first screw-operated engine for ruling diffraction gratings, the fore-runner of almost all subsequent ruling engines. With it he and his assistant D. C. (...) Chapman ruled many gratings which he generously distributed to practising scientists, thereby materially advancing the science of spectroscopy. Rogers was a Harvard astronomer who developed an interest in the ruling of fine lines on glass that led him to construct a ruling engine with which he investigated the causes of the errors in the rulings he had examined. He continued to seek improvements with a second engine designed for ruling diffraction gratings. He ceased developing this engine when Rowland’s excellent gratings began to be available, concentrating instead on related problems to which he could apply the knowledge and skills he had gained, but his investigations assisted Rowland and other later ruling engine builders. This paper brings together what is known about the ruling engines of Rutherfurd and Rogers, their development, the gratings they produced, their quality and the work that was done with them, and assesses and compares their achievements and the impacts of the work of these two men. (shrink)

In this article, we discuss the practice of conducting research in one's own field, in this case, from a position as a researcher with a nursing background doing fieldwork in a hospital and in one's own organization, an orthopedic surgical department. We show how an “insider” researcher position paves the way for analytical insights about sleep as an institutional phenomenon in the orthopedic surgical infrastructure and how acute and elective patient trajectories differ but build on the same logic, creating the (...) same dynamics of inclusion and exclusion. Through a situated and sociomaterial perspective, we analyze different clinical interactions in which we follow the hospital bed as an example of a central relational element that co‐creates sleep as an institutional phenomenon. Inspired by Karen Barad, we demonstrate how to move diffractively when doing and analyzing fieldwork and argue how moving diffractively as a researcher doing fieldwork “at home” is productive and challenges the concept and demand of “distance” as the phenomenological exercise in fieldwork. (shrink)

It is shown that the fact that an electron diffraction or interference pattern is not dependent on observer movement may be explained by de Broglie's phase waves, but cannot be explained by Schrödinger waves.

This paper employs the ideas of geometric algebra to investigate the physical content of Dirac's electron theory. The basis is Hestenes' discovery of the geometric significance of the Dirac spinor, which now represents a Lorentz transformation in spacetime. This transformation specifies a definite velocity, which might be interpreted as that of a real electron. Taken literally, this velocity yields predictions of tunnelling times through potential barriers, and defines streamlines in spacetime that would correspond to electron paths. We also present a (...) general, first-order diffraction theory for electromagnetic and Dirac waves. We conclude with a critical appraisal of the Dirac theory. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Reviewed by:Figures of Entanglement: Diffractive Readings of Barad, New Materialism, and Rhetorical Theory and Criticism ed. by Christopher N. Gamble and Joshua S. HananSavannah Greer DowningFigures of Entanglement: Diffractive Readings of Barad, New Materialism, and Rhetorical Theory and Criticism. Edited by Christopher N. Gamble and Joshua S. Hanan. Routledge, 2021. xvi + 122 pp. $168 (hardcover), $47.16 (electronic book). ISBN: 9780367903794.Rhetorical scholars have turned to various new materialist frameworks (...) to shift the discipline's historically anthropocentric focus and fully engage matter's rhetoricity. While all such frameworks attempt to challenge "the anthropocentric assumption that nonhuman matter is intrinsically passive or non-agential and thus external to or separable from (human) meaning," Figures of Entanglement enters this burgeoning conversation by centering the unique contributions of Karen Barad (xi, x). Readers may recognize this collection from a 2016 special issue of Review of Communication. Yet, with a new foreword by editors Christopher N. Gamble and Joshua S. Hanan and an afterword by Laurie Gries, this collection makes Barad's distinct approach to matter's rhetoricity even more apparent, underscoring its fruitful potential for new materialist rhetorics invested in ethical, political transformation.In the book's foreword Gamble and Hanan differentiate Barad's per-formative new materialism from "vital" as well as what they refer to as "negative" new materialisms to show the generative potential of Barad's framework and the notion of entanglement (x). Other new materialisms tend to be "inclusionary"—add matter and stir—and fail to complicate "the human" itself and its differences (xiv, xi). First, vital and negative new materialisms maintain a distinction between being and knowing, allowing humans to emerge with a unique capacity to "objectively observe and know the existence of something essential, determinate, and unchanging about [End Page 395] reality that precedes and remains unaffected by both its own activities and our observations of it" (xi). On the contrary, Barad's performative approach suggests that "no aspect of reality—including human thought, meaning, and observation—is in any sense external to matter or ever remains entirely unchanged by matter's ongoing performances" (x). Here, humans are not "outside" of observation, but all observation "human or otherwise" co-constitutes what is observed (xi). Second, failing to interrogate "the human" in an attempt to observe matter's vitality is an ethical flaw that makes other approaches less capable of grappling with difference: they have been charged with "erasing associations between race, gender, and matter" and (re)producing a homogenizing, "Western-colonialist notion of humanness" (xiv). In contrast, Barad's is a "thoroughly relational," performative new materialism (1).Barad's concept of "entanglement" draws attention to the indeterminacy of matter and meaning, but it is accompanied by an ethical imperative to examine how difference, human or otherwise, is produced and the implications of power imbalances that arise through these enactments. For Barad, the notion of entanglement does not dissolve difference; difference is what matters. Indeed, they give us a way of thinking about how performative intra-actions produce difference through material-discursive practices, or apparatuses—differences that may be expected but are not inevitable. Rhetorical scholars are therefore invited to interrogate the production of boundaries that cause harm and reconfigure them, rather than assume the discreteness of boundaries from the start. Gamble and Hanan thus make a convincing case for how Barad's work may contribute to important scholarship in decolonial and critical rhetorics for which vital and negative new materialisms are less equipped.Gamble and Hanan utilize the introduction to show how Barad's per-formative new materialism both "supports and affirms" rhetorical materialism, or rhetoric's materiality, and enriches it (5). Ushered in by Michael Calvin McGee, "standard" rhetorical materialism worked to challenge the centuries-old debate about rhetoric's secondary, supplementary status vis-à-vis philosophy by recognizing rhetoric as part of a "shifting and dynamic material history" (6). Building upon this view, Ronald Walter Greene utilizes Foucault's notion of the apparatus to demonstrate how even the "material history" McGee called our attention to is itself "produced by apparatuses"—history is not "outside" of meaning (6). Instead, rhetoric's materiality is a "publicity effect" produced through technologies of rhetoric and intersecting power... (shrink)

SummaryDiffraction gratings have contributed enormously to modern science. Although some historians have written about them, there is much more to be brought to light. This paper discusses their development and use in the period up to about 1880 before Rowland began to produce them. Rittenhouse described the action of a diffraction grating in 1786, but no explanation was possible until the wave theory of light was developed. Fraunhofer discovered the dark lines in the solar spectrum in 1814, and then (...) investigated diffraction, producing the first ruled gratings, making detailed measurements and calculating the wavelengths of prominent spectral lines. After Bunsen and Kirchhoff showed the association between spectral lines and chemical elements there was an upsurge of interest in measuring wavelengths. The gratings used in this work almost all came from one source, a relatively unknown instrument maker called Nobert, who made them by an extremely laborious process using a machine he had built himself. The most significant wavelength measurements were made by Ångström, but Mascart, Van der Willigen, Stefan, Ditscheiner and Cornu also did important work. Nobert gratings were investigated by Quincke, copied photographically by Rayleigh, and were known and discussed in the USA. Nobert's work helped to advance spectroscopy much more than has been acknowledged. (shrink)