Detection of Giant Radio Pulses from the Pulsar PSR B0656+14

Giant pulses (GPs) have been detected from the pulsar PSR B0656+14. A pulse that is more intense than the average pulse by a factor of 120 is encountered approximately once in 3000 observed periods of the pulsar. The peak flux density of the strongest pulse, 120 Jy, is a factor of 630 higher than that of the average pulse. The GP energy exceeds the energy of the average pulse by up to a factor of 110, which is comparable to that for other known pulsars with GPs, including the Crab pulsar and the millisecond pulsar PSR B1937+21. The giant pulses are a factor of 6 narrower than the average pulse and are clustered at the head of the average pulse. PSR B0656+14 along with PSR B0031-07, PSR B1112+50, and PSR J1752+2359 belong to a group of pulsars that differ from previously known ones in which GPs have been detected without any extremely strong magnetic field on the light cylinder.Comment: 10 pages, 3 figures, 1 table; originally published in Russian in Pis'ma Astron. Zh., 2006, v.32, 650; translated by George Rudnitskii; the English version will be appear in Astronomy Letter

Deformation of an Elastic Spherical Shell under the Pressure of Viscous Incompressible Fluid

The deformation of an elastic spherical shell under the pressure of viscous incompressible fluid is considered. Analytical formulas for calculating the components of normal and tangential deflections of the shell middle surface are obtained. A new mathematical model of an elastic spherical shell is offered on the basis of introduction of the Finite Element Method calculations. The comparison of the asymptotic and numerical results is performed

Sawja: Static Analysis Workshop for Java

Static analysis is a powerful technique for automatic verification of programs but raises major engineering challenges when developing a full-fledged analyzer for a realistic language such as Java. This paper describes the Sawja library: a static analysis framework fully compliant with Java 6 which provides OCaml modules for efficiently manipulating Java bytecode programs. We present the main features of the library, including (i) efficient functional data-structures for representing program with implicit sharing and lazy parsing, (ii) an intermediate stack-less representation, and (iii) fast computation and manipulation of complete programs

СОВРЕМЕННЫЕ АНАЛИЗАТОРЫ ДЛЯ ОПРЕДЕЛЕНИЯ АЗОТА МЕТОДОМ КЬЕЛЬДАЛЯ

Current review covers all main stages of the quantitative determination of nitrogen by the Kjeldahl method: preparation and acid mineralization of samples, distillation, and various chemical and instrumental options for determining the ammonia released after the treatment of mineralization products with alkali. The review also describes the latest technical solutions used to improve and automate certain stages of analysis such as the usage of block and IR digesters that significantly increases the efficiency of sample mineralization and reduces its duration; the usage of automatic lifts for the mineralized samples, which reduces the work of the operator with the heavy and hot chemical samples as much as possible; the usage of autosampler, which provides the automatic transfer of mineralized samples to the distiller; the automation of distillation and titration processes; the use of software for processing the analysis results. The following technical characteristics of the basic components of automatic analyzers for the nitrogen determination by the Kjeldahl method are systematized: digesters, distillers, and titrators produced by such well-known companies as Buchi (Switzerland), C. Gerhardt, Behr Labor-Technik GmbH and FoodALYT GmbH (Germany), Foss Tecator (Denmark, Sweden), VELP Scientifica (Italy), J.P.Selecta (Spain), Hanon Instruments (China), OOO VPK Sibagropribor and OOO Vilitek (Russia). The data on the characteristics of the analyzers is also provided and includes the number and volume of test tubes (flasks), the time of mineralization, distillation and analysis, mass (volume) of the sample, and the lower limit of nitrogen detection.Keywords: Kjeldahl method, acid mineralization, distillation and quantitative determination of ammonia, automatic nitrogen analyzerDOI: http://dx.doi.org/10.15826/analitika.2019.23.2.002(Russian)E.A. Zauer, A.B. ErshovVolgograd State Technical University, pr. Lenina, 28, Volgograd, 400005,Russian FederationВ предлагаемом обзоре рассмотрены основные стадии определения азота методом Кьельдаля: подготовка и кислотная минерализация проб, отгонка и различные варианты (химические и инструментальные) определения аммиака, выделившегося после обработки продуктов минерализации щелочью. Приведены новые технические решения последних лет по совершенствованию и автоматизации отдельных стадий анализа: применение блочных и ИК-дигесторов, существенно повысивших эффективность минерализации образцов и снизивших ее длительность; использование автоматических подъемников минерализованных проб, максимально сокративших работу оператора с тяжелыми пробами и горячими химическими веществами; автосемплеров, обеспечивающих автоматическую передачу минерализованных проб в дистиллятор; автоматизация процессов дистилляции и титрования; использование программного обеспечения для обработки результатов анализа. Систематизированы технические характеристики основных узлов автоматических анализаторов для определения азота методом Кьельдаля – дигесторов, дистилляторов и титраторов, выпускаемых такими известными фирмами, как Buchi (Швейцария), C. Gerhardt, Behr Labor-Technik GmbH и FoodALYT GmbH (Германия), Foss Tecator (Дания, Швеция), VELP Scientifica (Италия), J.P.Selecta (Испания), Hanon Instruments (Китай), ООО ВПК Сибагроприбор и ООО «Вилитек» (Россия). Также приведены данные об основных аналитических характеристиках анализаторов: числе и объеме пробирок (колб), времени минерализации, дистилляции и анализа; массе (объеме) пробы, нижнем пределе обнаружения азота.Ключевые слова: метод Кьельдаля, кислотная минерализация, отгонка и определение аммиака, автоматический анализатор азотаDOI: http://dx.doi.org/10.15826/analitika.2019.23.2.00

ОПЫТ ОРГАНИЗАЦИИ РАДИАЦИОННОГО КОНТРОЛЯ ЛЮДЕЙ, ПРИБЫВАВШИХ В ЛЕНИНГРАД ИЗ РАЙОНОВ, ПОДВЕРГШИХСЯ РАДИОАКТИВНОМУ ЗАГРЯЗНЕНИЮ В СВЯЗИ С АВАРИЕЙ НА ЧЕРНОБЫЛЬСКОЙ АЭС

An article considers issues related to the radiological examination of the people arrived in Leningrad from the areas radioactively contaminated due to the Chernobyl nuclear power plant accident. It also describes the experience of creation and functioning of the specialized station for radiation control and sanitary treatment of people and their personal clothes. The article specifies basic requirements for such stations.В статье рассматриваются вопросы, связанные с радиационным обследованием людей, прибы- вавших в Ленинград с радиоактивно загрязнённых территорий в связи с аварией на Чернобыльской АЭС. Описывается опыт создания и эксплуатации специального пункта по приёму, радиационному контролю и санитарной обработке людей и носильных вещей. Представлены основные требования к таким пунктам

Property (T)(T) for noncommutative universal lattices

We establish a new spectral criterion for Kazhdan's property $(T)$ which is applicable to a large class of discrete groups defined by generators and relations. As the main application, we prove property $(T)$ for the groups $EL_n(R)$, where $n\geq 3$ and $R$ is an arbitrary finitely generated associative ring. We also strengthen some of the results on property $(T)$ for Kac-Moody groups from a paper of Dymara and Januszkiewicz (Invent. Math 150 (2002)).Comment: 47 pages; final versio

Stable monopole and dyon solutions in the Einstein-Yang-Mills theory in asymptotically anti-de Sitter Space

A continuum of new monopole and dyon solutions in the Einstein-Yang-Mills theory in asymptotically anti-de Sitter space are found. They are regular everywhere and specified with their mass, and non-Abelian electric and magnetic charges. A class of monopole solutions which have no node in non-Abelian magnetic fields are shown to be stable against spherically symmetric linear perturbations.Comment: 9 pages with 5 figures. Revised version. To appear in Phys Rev Let