Starting from a connected, partially ordered set of events, it is shown that results of the measurement of time are elements of a partially ordered and filtering field, as used in a previous paper. Moreover, some relations between physical formulas and properties of the field are proved. Finally, some open problems and suggestions are pointed out. For the convenience of the reader not acquainted with elementary algebraic methods, proofs are given in detail.

Neurosteroid 17 beta-estradiol (E2) is a steroid synthesized de novo in the nervous system that might influence neuronal activity and behavior. Nevertheless, the impact of E2 on the functioning of those neural systems in which it is slightly synthesized is less questioned. The vestibulo-ocular reflex (VOR) adaptation, may provide an ideal arena for investigating this issue. Indeed, E2 modulates cerebellar parallel fiber-Purkinje cell synaptic plasticity that underlies encoding of VOR adaptation. Moreover, aromatase expression in the cerebellum of adult rodents is (...) maintained at very low levels and localized to Purkinje cells. The significance of age-related maintenance of low levels of aromatase expression in the cerebellum on behavior, however, has yet to be explored. Our aim in this study was to determine whether E2 synthesis exerts an effective and persistent modulation of VOR adaptation in adult male rats. To answer this question, we investigated the acute effect of blocking E2 synthesis on gain increases and decreases in VOR adaptation using an oral dose (2.5 mg/kg) of the aromatase inhibitor Letrozole in peri-pubertal and post-pubertal male rats. We found that Letrozole acutely impaired gain increases and decreases in VOR adaptation without altering basal ocular-motor performance and that these effects were similar in peri-pubertal and post-pubertal rats. Thus, in adult male rats neurosteroid E2 effectively modulates VOR adaptation in both of the periods studied. These findings imply that the adult cerebellum uses E2 synthesis for modulating motor memory formation and suggest that low and extremely localized E2 production may play a role in adaptive phenomena. (shrink)

No examination of our topic can be complete without taking into account the appearance of a new face on the "religious-political stage"—Russian Catholicism.

Big cities and growing industrial areas bring high risk of different kinds of pollutions which would implicate to the quality of life of the society. Discovering and monitoring of polluted areas using autonomous mobile robots is nowadays a frequently considered solution concerning both environmental and human safety problems. Being part of a distributed control system, such robots can help to improve the efficiency of the existing conventional pollution prevention systems. On the other hand, during the last decade, wireless sensor networks (...) have provoked the interest of specialists from different areas by imposing a large number of theoretical and practical challenges related to their implementation. This paper attempts to deal with both issues by presenting a possible way for building robotized WSNs that can be suitable for solving different environmental monitoring tasks. The goal is to transform the WSN into an adaptive sensor system with intelligent behavior that can be used to discover and track spots or areas where given monitored environmental parameters violate defined thresholds. The inclusion of robotized agents into the WSN structure can provide additional flexibility with respect to the installation of the network sensors and allow reliable information gathering and transfer. The proposed algorithmic methods have been tested on a pre-built laboratory prototype of a robotized WSN. The robotized agents have been built using iRobot Create mobile platforms that are additionally equipped with a single-chip computers Gumstix Verdex pro TM XL6P with various expansion modules. (shrink)

t. 1. Domarksistskai︠a︡ teorii︠a︡ poznanii︠a︡ --t. 2. Sot︠s︡ialʹno-kulturnai︠a︡ priroda poznanii︠a︡.

Our journal is now a half century old. ... For those who have been associated with Voprosy filosofii all these years the time, it seems, has passed quickly. I remember how we celebrated the twenty-fifth anniversary of the journal and the plans we made then. It seems that all this happened quite recently. But if one now recalls what happened with our journal and our philosophy in general during these years, one gets the uncanny feeling that we have lived through (...) several lives with Voprosy filosofii, very intense and dramatic lives, each continuing the preceding one and at the same time somehow quite different from it. (shrink)

UNESCO has declared 1996 to be the year of tolerance. The issue of tolerance has been discussed at a number of conferences, seminars, and symposia both in our country and abroad. I have participated in some of these discussions and would like to share some thoughts on this problem. But first let me call attention to a number of points that will become clearer later on. First, the idea of tolerance is in reality not as simple as it seems, because (...) it proceeds from certain premises and entails a number of conclusions. Moreover, it may be understood in different ways leading to different results. Most importantly, this seemingly limited, although practically important issue is associated with a number of fundamental philosophical questions bearing on our understanding of man and his identity, the possibilities and limits of cognition and mutual understanding, and so forth. (shrink)

Книга предназначена для студентов, преподавателей и научных сотрудников высших учебных заведений, занимающихся вопросами философии.

Издание предназначено для студентов и преподавателей гуманитарных образовательных учреждений, специалистов и практиков в различных областях науки.