Articles de revues : « Radiophysics Laboratory »

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Pereslegin, V. S., N. G. Kozhelupova, D. V. Ivonin et S. A. Sviridov. « TO THE 95th ANNIVERSARY OF THE BIRTH OF SERGEI VLADIMIROVICH PERESLEGIN (01.10.1928–31.07.2023) ». Journal of Oceanological Research 51, n^o 3 (9 novembre 2023) : 267–80. http://dx.doi.org/10.29006/1564-2291.jor-2023.51(3).18.

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The article is dedicated to the 95th anniversary of the birth of Sergei Vladimirovich Pereslegin – radiophysicist – oceanologist, Candidate of Technical Sciences (1977), Doctor of Physical and Mathematical Sciences (2000), Chief Researcher of the Laboratory of Nonlinear Wave Processes of the Shirshov Institute of Oceanology of RAS. Dr. Pereslegin is the creator of a new direction at the Institute of Oceanology at the intersection of theoretical and experimental radiophysics and oceanology – the development of radar methods for ocean research. Sergei Pereslegin left us on July 31, 2023, leaving behind many ideas, projects and inventions.

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Minnett, H. « The Radiophysics Laboratory at the University of Sydney. » Historical Records of Australian Science 12, n^o 4 (1998) : 419. http://dx.doi.org/10.1071/hr9991240419.

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Davies, Jenny. « Resource Sharing in the CSIRO Division of Radiophysics Library ». International Astronomical Union Colloquium 110 (1989) : 196–97. http://dx.doi.org/10.1017/s0252921100003390.

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The CSIRO Divison of Radiophysics was established as the CSIRO Radiophysics Laboratory in 1939 to conduct radar research. After World War 2 experimental radar instruments were applied to the developing field of radio astronomy. Current areas of research for the Division, which is host to the new Australia Telescope (AT), are radio astronomy, antenna technology, satellite communications, signal processing and microelectronics.The AT has three observatory sites, all in New South Wales: six antennas near Narrabri, over 500 km from Sydney, the 27-year-old Parkes observatory, 350 km from Sydney, and one antenna near Coonabarabran, between Parkes and Narrabri. Most staff are located at the Division’s headquarters in Sydney, where the main library is also located, and small collections are maintained at the Parkes and Narrabri observatories.

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Gubsky, Dmitry, Irina Ivanova et Anatoly Kleschenkov. « Developing of computer models of modern measuring instruments for a remote virtual laboratory ». ITM Web of Conferences 30 (2019) : 11001. http://dx.doi.org/10.1051/itmconf/20193011001.

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The study introduces the approach of creating a virtual laboratory for performing laboratory works with remote access. The proposed virtual lab can be used for distance learning and is an extension of the functionality of the previously created virtual workshop. This virtual laboratory with remote access is an alternative to laboratory works performed with real experimental equipment and provides an opportunity to gain skills in operation with measuring microwave equipment without giving classes in educational laboratories. The results of testing virtual lab works with remote access in educational radiophysics laboratories are presented.

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Robertson, Peter, Glen Cozens, Wayne Orchiston, Bruce Slee et Harry Wendt. « Early Australian Optical and Radio Observations of Centaurus A ». Publications of the Astronomical Society of Australia 27, n^o 4 (2010) : 402–30. http://dx.doi.org/10.1071/as09071.

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AbstractThe discovery of the radio source Centaurus A and its optical counterpart NGC 5128 were important landmarks in the history of Australian astronomy. NGC 5128 was first observed in August 1826 by James Dunlop during a survey of southern objects at the Parramatta Observatory, west of the settlement at Sydney Cove. The observatory had been founded a few years earlier by Thomas Brisbane, the new governor of the British colony of New South Wales. Just over 120 years later, John Bolton, Gordon Stanley and Bruce Slee discovered the radio source Centaurus A at the Dover Heights field station in Sydney, operated by CSIRO's Radiophysics Laboratory (the forerunner to CSIRO Astronomy and Space Sciences). This paper will describe this early historical work and summarize further studies of Centaurus A by other Radiophysics groups up to 1960.

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Sullivan, Woodruff T. « Some Highlights of Interferometry in early Radio Astronomy ». International Astronomical Union Colloquium 131 (1991) : 132–49. http://dx.doi.org/10.1017/s025292110001321x.

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AbstractTwo important episodes in the early development of interferometry in radio astronomy are traced in detail. The first is the use of the sea-cliff interferometer at the Radiophysics Laboratory in Sydney, first by Pawsey for solar observations and later by Bolton for radio star surveys. The second is the development of the Michelson interferometer and the phase switch by Ryle in Cambridge. This also was employed for important observations of the sun and radio stars.

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Thomas, Bruce MacA, et Brian J. Robinson. « Harry Clive Minnett 1917 - 2003 ». Historical Records of Australian Science 16, n^o 2 (2005) : 199. http://dx.doi.org/10.1071/hr05011.

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In April 1940, Harry Minnett joined the Council for Scientific and Industrial Research (CSIR, renamed CSIRO in May 1949), soon after the establishment of the Radiophysics Laboratory for research into advanced radar systems. He remained with the organization until his retirement in 1981. Harry's ability as a meticulous engineer with a thorough understanding of the related underlying scientific principles was recognized by his being appointed to leading roles in a number of significant projects. These were to have a long-term impact on Australian science and technology. Among the most important was his role in guiding the design of the Parkes 64-m radio telescope to successful completion, and the establishment of a world-recognized research group on antenna design to support radio telescope design and upgrades. He also had considerable impact on the construction of the 3.9-m Anglo-Australian optical telescope at Siding Spring Mountain, New South Wales, and the 'Interscan' aircraft Microwave Landing System being developed by the Division of Radiophysics in collaboration with industry. He was Chief of the Division from 1978 to 1981. Harry died on 20 December 2003 after a short period of illness.

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Koribalski, Bärbel. « Millimetre-wave Astronomy : Abstracts from a One-day Workshop held on 19 April 1995 at the Australia Telescope National Facility ». Publications of the Astronomical Society of Australia 13, n^o 2 (mai 1996) : 179–81. http://dx.doi.org/10.1017/s1323358000020750.

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SummaryA Millimetre-wave Astronomy Workshop was held at the CSIRO Radiophysics Laboratory in Marsfield, Sydney, on 19 April 1995. The workshop, sponsored by the Australia Telescope National Facility (ATNF), was a meeting of mm-wave specialists as well as astronomers and students interested in the field, and attracted about 80 participants from 13 institutions. The program consisted of 23 oral contributions (5–45 min) followed by lively discussions. Abstracts of most of the contributions are presented here, arranged by groups dealing with subjects such as ‘A Basic Introduction’, ‘Astronomy in the mm-range with Mopra’ and ‘Projects: Galactic and Extragalactic 3 mm-wave astronomy’.

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Koribalski, Bärbel. « Dark Matter : Abstracts from a Two-day Workshop held in February 1994 by the Australia Telescope National Facility ». Publications of the Astronomical Society of Australia 12, n^o 1 (avril 1995) : 117–38. http://dx.doi.org/10.1017/s1323358000020142.

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Summary A Dark Matter Workshop was held at the CSIRO Radiophysics Laboratory in Marsfield, Sydney, on 24–25 February 1994. The workshop, sponsored by the Australia Telescope National Facility (ATNF), was a meeting of dark matter (DM) specialists as well as astronomers interested in the field, and attracted about 80 participants from nine institutions. The program consisted of 22 oral contributions (15–45 minutes), followed by lively discussions, as well as podium discussions at the end of each day. Abstracts of most of the contributions are presented here, arranged by subject groups which range from ‘Gravitational Lensing and DM in Clusters’, ‘DM in Elliptical Galaxies’, ‘The Nature of DM’, and ‘The Shapes of Dark Halos’ to ‘Alternatives to DM’.

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Ekers, RD. « John Bolton's Variable-baseline Interferometer and the Structure of Radio Galaxies ». Australian Journal of Physics 47, n^o 5 (1994) : 569. http://dx.doi.org/10.1071/ph940569.

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John Bolton was a pioneer in the study of extragalactic radio sources, first at the CSIRO Radiophysics Laboratory and then at the California Institute of Technology's Owens Valley interferometer. I became his Ph.D. student after he returned to the Parkes Observatory from California, and I helped in the construction of the Parkes interferometer. This consisted of a 60-ft dish connected to the existing 210-ft dish by a flexible cable trailing from the 60-footer. The interferometer was used to observe continuously at 467 and 1401 MHz while the 60-ft dish was pulled along a track. The wisdom of the design is illustrated by comparing observations of Pictor A made at Parkes and at Owens Valley.

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Krylov, V. P., R. A. Chirkov, M. O. Zabezhaylov et A. N. Khramov. « Solid materials microwave dielectric properties : features of methods practical use ». Izmeritel`naya Tekhnika, n^o 2 (9 avril 2024) : 49–54. http://dx.doi.org/10.32446/0368-1025it.2024-2-49-54.

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Features of methods practical use for material dielectric properties measurement in different (factory and metrological) laboratories and influence of above mentioned features on measurements results are considered. Results are obtained by Obninsk Research and Production Enterprise “Technologiya” A. G. Romashin radiophysics laboratory and by East-Siberian branch Federal State Unitary Enterprise “Russian metrological institute of technical physics and radio engineering” department of radio engineering measurements. Results of microwave permittivity and loss tangent solid materials measurements are analysed. This investigation made it possible to get additional information about features of standard methods practical use for material dielectric properties measurement, which was absent in literature earlier. In laboratories for measurements used the waveguide resonator and the standardized techniques. The factory laboratory applied a measurement method at the fixed frequency with control in a resonance movement of the plunger, and in metrological laboratory a measurement method with the fixed length of the resonator and measurement at resonant frequencies. Results of measurements showed good reproducibility of results for samples that are meeting method requirements. It was revealed reducing reproducibility of measurements of hygroscopic, heterogeneous samples and in the case of nonobservance of diameter method requirements. Obtained results can be applied for reproducibility improvement of dielectric properties measurements in practical use of considered methods.

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Filippov, V. V., A. A. Zavorotny, M. Yu Smirnov, V. S. Ziyautdinov et D. D. Lykov. « The Study of the Electrical Properties of Anisotropic Semiconductors in the Laboratory Workshop of the University Course in Physics ». SIBERIAN JOURNAL OF PHYSICS 18, n^o 2 (10 décembre 2023) : 105–17. http://dx.doi.org/10.25205/2541-9447-2023-18-2-105-117.

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The purpose of the article is to develop a theoretically and experimentally substantiated specific laboratory work for studying the anisotropy of the electrical properties of semiconductors within the framework of the curricula of higher educational institutions, for such areas of training as “Physics”, “Technical Physics”, “Radiophysics” and “Electronics and Nanoelectronics”. The relevance of the problem is due to the desire of domestic electronics for technological sovereignty and high requirements for the training of qualified personnel for the production of structures of solid-state functional electronics. Based on the solution of the boundary electrodynamic problem, an expression is obtained for the electric potential in the region of a thin rectangular semiconductor sample with a tensor character of conductivity. The results of this work is the development of an original laboratory setup for the demonstration and practical study of the anisotropy of the electrical properties of semiconductor crystals. The proposed technique makes it possible to determine the main electrokinetic parameters of an anisotropic semiconductor – specific conductivity, concentration and Hall mobility of the main charge carriers. A schematic diagram of the installation and formulas for calculating the errors of the measured quantities are proposed. The results obtained may also be of scientific interest in the study of anisotropic semiconductor materials in laboratory conditions.

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L Greenstein, Jesse. « The Early Years of Radio Astronomy at Caltech ». Australian Journal of Physics 47, n^o 5 (1994) : 555. http://dx.doi.org/10.1071/ph940555.

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By the early 1950s astronomy in the United States was under pressure to embrace radio astronomy, which was being developed largely outside the USA. Much of the motivation derived from the need for accurate radio source positions, so that optical telescopes like the California Institute of Technology's giant Palomar Telescope and the nearby Mt Wilson Telescope could identify these sources with astronomical objects. To lead Caltech's move into radio astronomy its president, Lee DuB ridge, realised that he needed a leader from a country with more practical experience than the USA. He turned to his wartime friend E. G. 'Taffy' Bowen, chief of the CSIRO's Radiophysics Laboratory in Sydney, who 'loaned' him John Bolton. John stayed at Caltech for a bare five years, but it was a time of inspired guidance that helped to secure a place in radio astronomy, not only for Caltech, but for the USA.

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Graham-Smith, Francis, Andrew G. Lyne et Clive Dickinson. « Rodney Deane Davies CBE. 8 January 1930—8 November 2015 ». Biographical Memoirs of Fellows of the Royal Society 64 (28 mars 2018) : 149–62. http://dx.doi.org/10.1098/rsbm.2017.0037.

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Following early life on a farm in South Australia and a degree in Physics at the University of Adelaide, Rod Davies began his research career at the Radiophysics Laboratory in Sydney in 1951, working on the development of radio interferometers for solar observations. In 1953, he moved to the University of Manchester, Jodrell Bank, working with Bernard Lovell, later becoming the Director of Jodrell Bank from 1988 to 1997 and the President of the Royal Astronomical Society from 1987 to 1989. He is best known for leading observations of the structure of the cosmic microwave background, first carried out at Jodrell Bank and then transferred to Tenerife during the 1980s and 90s. Later, he was instrumental in establishing the European Space Agency's Planck spacecraft mission and continued after retirement to be closely involved in the interpretation of the data from Planck . He was elected a Fellow of the Royal Society in 1992 and awarded a CBE in 1995. During Rod's tenure as Director of Jodrell Bank, he was responsible for the start of a major project to upgrade the Lovell Telescope, recognizing that with increased capability it could play a leading role into the 21st century. He was also Director during a major upgrade to the MERLIN telescope array, completed around 1991, and making MERLIN a modern, useable, open-access instrument. It was transformed into a true national facility, funded by government, and widely used by the national and international radio astronomy community. Rod Davies was always a kind and generous colleague, and a great inspiration to several generations of radio astronomers.

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Bulkin, Vladislav, Georgij Shchukin, Elena Fedoseeva et Il'ya Rostokin. « Radiometeorological research at the Murom Institute ». E3S Web of Conferences 420 (2023) : 07001. http://dx.doi.org/10.1051/e3sconf/202342007001.

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The history and current state of research on the atmosphere remote sensing at the Murom Institute of Vladimir State University (MI VlSU) from the creation of the first radiometric receivers in the early 70s to the modern "Radiophysical Research of Natural Environments" laboratory are considered.

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Yakymchuk, M. A., et S. I. Prylypko. « SOME ASPECTS OF THE APPLICATION OF THE FREQUENCY- RESONANCE METHOD IN THE DIAGNOSIS AND NEUTRALIZATION OF PATHOGENS ». Клінічна та профілактична медицина 1, n^o 23 (26 février 2023) : 100–104. http://dx.doi.org/10.31612/2616-4868.1(23).2023.14.

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Introduction: The method of bioresonance therapy is now quite widespread and occupies a certain and occupies a certain niche in the medical services market. The goal of the work: to study the possibility of using the frequency resonance method research for the detection of Bifidobacterium and Helicobacter pylori and the impact of frequency resonance on the biological environment. Materials and methods: The hardware complex was used in the work developed on the basis of the National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute» together with employees of the Institute of Applied Problems of Ecology, Geophysics and Geochemistry». On the basis of the clinical diagnostic laboratory of the State Institution of Science «Research and Practical Center of Preventive and Clinical Medicine» State Administrative Department of Ukraine conducted verification of Bifidobacterium and Helicobacter pylori in the in biological media, as well as the study of patients’ blood for sterility according to standard methods. In order to neutralize the pathogens identified during the laboratory the following frequency range was used to neutralize the pathogenic microorganisms detected during the laboratory Х81Х39.2ХХ2 Hz. (X – closed numbers, which will be removed after the protection of intellectual property rights of the authors). Results: Investigation of the possibility of verification of Bifidobacterium and Helicobacter pylori on photographs by frequency resonance method was carried out for the period from October 2021 to January 2022. Comparative analysis of the diagnostic value of the frequency resonance method in comparison with traditional standard methods used in the clinical and diagnostic laboratory of the State Institution of Science «Research and Practical Center of Preventive and Clinical Medicine» State Administrative Department of Ukraine showed a sufficiently high verification probability of more than 96 %. Conclusions: The research conducted requires more thorough additional study with the involvement of medical, biological, physical, and radiophysical scientists.

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Neradovsky, L. G. « The GPR-based estimation of the volumetric ice content of dispersed ground in the Central Yakut lowland ». Ice and Snow 59, n^o 1 (20 mars 2019) : 81–92. http://dx.doi.org/10.15356/2076-6734-2019-1-81-92.

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The previously unknown dependence between the volume ice content of frozen dispersed soils and their radiophysical properties (the speed of propagation and specific attenuation of the amplitude of electromagnetic waves) was studied in the layer of annual heat flows of Central Yakutia. The correlation between these characteristics determined in the laboratory and the method of discrete georadiolocation is established. The peculiarity of the connection is the sharp decline in the sensitivity of the propagation speed and the specific attenuation of electromagnetic waves in frozen dispersed soils with high volume ice content (more than 60%). In general, the specific attenuation of electromagnetic waves is more responsive to the change in the volume of ice content of frozen dispersed soils and, thus, it is more preferable to solve the problem of quantitative evaluation of this characteristic. The proposed method of reusable measurements of signals of georadiolocation with changing position and azimuth of antennas of georadars in the vicinity of the network points of geological and geophysical observations allows to estimate the average values of the propagation speed and specific attenuation of electromagnetic waves with an error of not more than 10%. Due to this, according to the equations of logistic functions it is possible to calculate the average values of volume ice content with an error of 7–11%. With this error, the picture of the probability distribution according to the georadiolocation values of the volume ice content in the averages is completely identical to the laboratory data. On this basis, the found regression equations are recommended to be used for the calculation of the speed of propagation and specific attenuation of electromagnetic waves of background or average values of the volume ice content of frozen dispersed soils of the annual heat transfer layer in any part of the ice complex of the Central Yakut lowland.

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« Doppler ultrasound described and analyzed using the two-dimensional Fourier transform L.S. Wilson, Ultrasonics Laboratory, CSIRO Division of Radiophysics, 126 Greville Street, Chatswood NSW 2067, Australia ». Ultrasonic Imaging 13, n^o 2 (avril 1991) : 209. http://dx.doi.org/10.1016/0161-7346(91)90134-4.

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« Review of ultrasonic attenuation algorithms using a bovine muscle model L.S. Wilson, J.M. Denlay and D.E. Robinson, Ultrasonics Laboratory, CSIRO Division of Radiophysics, 126 Greville Street, Chatswood NSW 2067, Australia ». Ultrasonic Imaging 14, n^o 2 (avril 1992) : 197–98. http://dx.doi.org/10.1016/0161-7346(92)90031-p.

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Петров, Д. В. « Analysis of the trading zones establishing based on the example of the mastering and applying of psychophysiology by the radiophysiсs master’s students of the Lobachevsky State University of Nizhny Novgorod ». Вестник Вятского государственного университета, n^o 4 (26 novembre 2018). http://dx.doi.org/10.25730/vsu.7606.18.034.

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В статье рассматривается возможность искусственного построения различных зон обмена исходя из анализа конкретной зоны обмена, формирующейся при Межкафедральной лаборатории когнитивной психофизиологии ННГУ им. Лобачевского. Среди магистрантов‑радиофизиков, проходивших учебную практику при кафедре психофизиологии, был проведен двухэтапный опрос: тридцать студентов прошли анкетирование, после которого у пятерых опрошенных было взято интервью. Анкетирование показало, что, во‑первых, четырем из пяти опрошенных интересна психофизиология и в большинстве случаев источником этого интереса является не столько непосредственная научная работа и общение с учеными, сколько популяризация научного знания, осуществляемая через общую для всех медийную среду; во‑вторых, все респонденты, имевшие опыт общения со специалистами в психофизиологии, не встречали серьезных препятствий в нахождении общего языка со своими коллегами. Материал интервью подтверждает, что междисциплинарный пиджин в данном случае образуется стихийно, не требуя неких целенаправленных разработок. Научный обмен в данной области оказывается несимметричным: радиофизики интересуются в первую очередь теоретическими наработками психофизиологов, результатами их экспериментов; при этом главное, что нужно психофизиологам от радиофизиков, – методики использования измерительного оборудования (МРТ, ЭЭГ и др.). Общим полем для первых и вторых оказывается интерпретация данных, полученных с помощью технических средств. Также интервью показали, что основными элементами формирования рассмотренной зоны обмена оказываются предварительное самостоятельное освоение авторитетных источников по теме исследования, освоение терминологии, взаимодействие в рамках совместного проекта, видение практической пользы этого проекта, культура научного диалога, активное общение и искренний интерес обеих сторон к общему исследованию. Автор статьи приходит к выводу, что по меньшей мере в данном направлении исследований возможно построение зон обмена разного типа. in the article the possibility of artificial construction of various zones of trading is considered proceeding from the analysis of a specific trading zone formed at the Interdepartmental Laboratory of Cognitive Psychophysiology of the Lobachevsky State University of Nizhny Novgorod. A two‑stage survey was conducted among the radiophysiсs master’s students, who passed the training practice at the department of psychophysiology. Thirty students were questioned, after which five respondents were interviewed. The questionnaire showed that, firstly, four out of five interviewed are interested in psychophysiology and in most cases, the source of this interest is not direct scientific work and communication with scientists, but rather the popularization of scientific knowledge, carried out through a shared media environment; secondly, all respondents, who had experience of communication with with psychophysiology specialists, did not face major challenge finding a common language with their colleagues. The material of the interview confirms that the interdisciplinary pidgin in this case is formed, apparently, spontaneously, without requiring certain purposeful developments. Scientific exchange in this area is asymmetric: radiophysicists are primarily interested by the theoretical developments of psychophysiologists, the results of their experiments; the main thing that psychophysiologists need from radiophysicists is the methods of using measuring equipment (MRI, EEG, etc.). A shared field for the first and second is the interpretation of data obtained with the help of technical means. Also, interviews revealed that the base elements of the considered trading zone establishing are: preliminary independent examination of authoritative sources on the topic of research, terminology acquisition, interaction within the framework of a joint project, a vision of the practical benefits of this project, the culture of scientific dialogue, active communication and sincere interest of both sides towards a shared research. The author of the article comes to the conclusion that it is possible to construct trading zones of different types at least in this area of research.

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Articles de revues sur le sujet « Radiophysics Laboratory »

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