Microstructural and magnetic characterization of Ni0.5Zn0.5Fe2O4 ferrite nanoparticles

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Epidemiology of physical activity in adult Polish population in the second decade of the 21st century. Results of the NATPOL 2011 study

Objectives: The aim of the study was to assess physical activity (PA) level in a representative sample of Polish adults.Materials and Methods: A cross-sectional analysis was performed among 2413 randomly selected individuals (51.5% women) aged 18-79 years, who participated in the Nationwide Study of Occurrence of Risk Factors of Cardiovascular Diseases NATPOL 2011 (March-July 2011). The study procedures consisted of a questionnaire as well as of anthropometric, blood pressure and biochemical measurements. Leisure-time, occupational and commuting PA were assessed by the use of a questionnaire interview. Results: About 48.2% of adults do exercise for at least 30 minutes on most days of a week. About 11% of the respondents declare a sedentary lifestyle. About 26.5% of working population report hard physical work, while sedentary work is reported by 47.6% of the employed participants. Active commuting is declared by 27.3% of working/studying population. About 47.2%, 36.6%, and 15.3% spend 30 min per day, respectively, on this kind of PA. Conclusions: PA level of more than half of Polish adults is still not satisfactory. Promotion of an active lifestyle should concern mainly leisure-time and commuting PA with paying special attention to substantial differences in various socio-demographic groups

Rapid continuous microwave-assisted synthesis of silver nanoparticles to achieve very high productivity and full yield: from mechanistic study to optimal fabrication strategy

Systematic studies of silver nanoparticle synthesis in a continuous-flow single-mode microwave reactor using polyol process were performed, revealing that the synthesis is exceptionally effective to give very small metal particles at full reaction yield and very high productivity. Inlet concentration of silver nitrate or silver acetate, applied as metal precursors, varied between 10 and 50 mM, and flow rates ranged from 0.635 to 2.5 dm3/h, to give 3–24 s reaction time. Owing to its much higher reactivity, silver acetate was shown to be far superior substrate for the synthesis of small (10–20 nm) spherical silver nanoparticles within a few seconds. Its restricted solubility in ethylene glycol, applied as the solvent and reducing agent, appeared to be vital for effective separation of the stage of particle growth from its nucleation to enable rapid synthesis of small particles in a highly loaded system. This was not possible to obtain using silver nitrate. All the observations could perfectly be explained by a classical LaMer–Dinegar model of NPs’ formation, but taking into account also nonisothermal character of the continuous-flow process and acetate dissolution in the reaction system. The performed studies indicate an optimal strategy for the high-yield fabrication of metal particles using polyol method

Rethinking Realism: A Critique of Georg Lukács

Word Count: 3,624  In ?The Ideology of Modernism,? Georg Lukács proposes the following antithesis in order to critique the aesthetic condition of modern subjectivity: ?Abstract potentiality belongs wholly to the realm of subjectivity; whereas concrete potentiality is concerned with the dialectic between the individual?s subjectivity and objective reality? (24). The necessity of such an opposition resides in the aesthetic preservation of ?Realism,? i.e., the commitment to interrogating and discovering the true laws governing objective reality?in short, the uncovering of essence from the distorting images of appearance. Lukács identifies the emergence of Modernism as a symptom of the impossibility to negotiate, aesthetically, the difference between appearance and essence: ?If the distinction between abstract and concrete potentiality vanishes, if man?s inwardness is identified with an abstract subjectivity, human personality must necessarily disintegrate? (ibid). Despite his dialectical exhortations, my paper will be an attempt to demonstrate that Lukács? understanding of Realism effectuates an absolutization of ?concrete potentiality? insofar as he reduces the relationship of the literary subject to an essentialized form, namely, an explicit recuperation of Aristotle?s concept of man as a ?zoon politikon? (31). The circumscription of the literary subject as an immutable absolute?renders eternal, what realist literature has always understood to be temporal. In other words, Lukács? aesthetic strictures have transformed the immanent forms of literary production into static forms of transcendence.

Possibilities of voice supporting of the pilot in multi-task military aircraft

The article presents selected results of the analytical works, carried out in the Air Force Institute of Technology, in the field of possibilities to support the pilot’s work in the cabin of the modern multi-task aircraft or military helicopter with the use of the computer voice communication assistant, with automatic recognition of the pilot’s voice and speech, which operates in conditions of the lack of time. There are presented the voice systems warning the pilot of the occurrence of an emergency state, as the so-called voice guides, P-591-04 type, used in the MiG-29 multipurpose aircraft and RI-65 type, used in the Mi-17 and Mi-24 helicopters. As an example of implementation of the concept of a new system supporting the pilot’s work, there was selected the voice communication system, constructed in the Air Force Institute of Technology for the W-3PL multi-purpose helicopter with the ZSA integrated avionics system. The main research problems related to the construction of integrated avionics systems, verbally supporting the pilot’s work, were discussed, and the specialized tools and research stations used in the Air Force Institute of Technology for the phonoscopic speech and voice studies, were presented. Furthermore, an example of the functional diagram and the system architecture of the pilot’s work verbal supporting for a selected emergency situation on the aircraft board were demonstrated, as well as the expected range of that system’s applications

Quality testing of the pilot’s verbal communication with the environment in conditions of the occurence of large linear loads

W artykule przedstawiono wyniki prac analitycznych realizowanych w Instytucie Technicznym Wojsk Lotniczych w zakresie możliwości prowadzenia i analizy komunikacji werbalnej pilota w kabinie wielozadaniowego samolotu wojskowego, w warunkach oddziaływania na niego dużych przeciążeń liniowych występujących podczas wykonywania manewrów. Omówiono wybrane pokładowe systemy komunikacji werbalnej i rejestracji mowy pilota stosowane na statkach powietrznych eksploatowanych w Siłach Zbrojnych RP. Szczególną uwagę zwrócono na problemy badawcze związane z budową zintegrowanych systemów awionicznych, werbalnie wspomagających pracę pilota i rejestrujących jego mowę oraz omówiono specjalistyczne metody badawcze wykorzystywane do fonoskopijnych badań mowy i nieartykułowanych parametrów głosu, a także innych dźwięków pochodzących z kabiny statku powietrznego (tzw. tło akustyczne). Zaprezentowano przykładowe zapisy i wyniki analizy korespondencji werbalnej pilota oraz przedstawiono zakres zastosowania tych wyników w przyszłych pracach badawczych (m.in. w warunkach oddziaływania dużych przeciążeń liniowych wytwarzanych na wirówce przeciążeniowej).The paper presents the results of analytical works implemented in the Air Force Institute of Technology in terms of the possibilities of conducting and analysing the pilot’s verbal communication in the multi-purpose aircraft cockpit, under conditions of influence of large linear loads, which occur during the performance of manoeuvres. The selected on-board verbal communication and the pilot’s speech recording systems used in the aircraft operated in the Polish Armed Forces were discussed. Particular attention was paid to the research problems related to the construction of integrated avionics systems, which verbally support the pilot’s work and record his speech, but also to the methods used in the speech phonoscopic examination and inarticulate voice parameters, as well as other sounds coming from the aircraft cockpit (the so-called background noise) were presented. Sample records and analysis results of the pilot’s verbal correspondence quality under conditions of influence of large linear loads, in addition, the scope of using these results in future research works (on the high-G training) were presented

Information imaging and verbal communication systems used in aircraft search and rescue actions

W artykule przedstawiono wybrane wyniki prac analitycznych i konstrukcyjnych realizowanych w Instytucie Technicznym Wojsk Lotniczych w zakresie możliwości wspomagania pracy załogi śmigłowca tj. pilota-dowódcy załogi, pilota-operatora systemów pokładowych oraz technika pokładowego biorących udział w lotniczych akcjach poszukiwawczo-ratowniczych. Wspomaganie takie bazuje na wykorzystaniu systemu nahełmowego zobrazowania informacji z głowic obserwacyjnocelowniczych i komunikacji werbalnej z rozbitkiem. Omówiono wybrane urządzenia zobrazowania i komunikacji werbalnej zabudowane na statkach powietrznych eksploatowanych w Siłach Zbrojnych RP, które stosowane są w lotniczych akcjach poszukiwawczo-ratowniczych. Szczególną uwagę zwrócono na problemy związane z rozbudową zintegrowanych systemów awionicznych w zakresie nahełmowego zobrazowania parametrów pilotażowo-nawigacyjnych oraz nahełmowego zobrazowania informacji z głowic obserwacyjno-celowniczych min. system radionamiernika pokładowego oraz radiostacji ratowniczej, które wchodzą w skład zintegrowanego systemu łączności. Zaprezentowano przykładowe rozwiązania konstrukcyjne takich systemów oraz możliwości ich zastosowania w akcjach poszukiwawczo-ratowniczych.The paper presents the selected results of analytical and construction works implemented in the Air Force Institute of Technology in terms of the possibility of supporting the work of a pilot-commander and an on-board systems pilotoperator involved in aircraft search and rescue actions. Such support is based on using the information imaging system from observation and targeting heads and the verbal communication with a survivor. The selected imaging and verbal communication devices built in the aircraft operated in the Polish Armed Forces, which are used in aircraft search and rescue actions, were discussed. Particular attention was paid to the problems related to the extension of integrated avionics systems in terms of the helmet-mounted system of imaging the piloting-navigational parameters and the information imaging system from observation and targeting heads, as well as the on-board direction finder and the emergency locator transmitter. Sample design solutions of such systems and the possibility of their use in aircraft search and rescue actions were also presented

Effect of deformation on structure and mechanical behavior of polycrystalline Ni-Mn-Ga alloys

Deformation of polycrystalline Ni-Mn-Ga alloys was studied for both the L21 parent phase and 10 M martensitic state. The effect of deformation by compression up to the fracture on mechanical behavior and structure change was studied for the inhomogeneous as-cast state and after annealing at 900○C for 50 hours. The structure, after deformation of the parent phase, observed by TEM reveals the presence of 10 M and 14 M martensite in the matrix, whereas the deformation of 10 M martensite does not show the change of the structure type. The stress-strain curves were analyzed and compared with the earlier published results