Symbiotic stars in the Local Group of Galaxies

Preliminary results of the ongoing search for symbiotic binary stars in the Local Group of Galaxies are presented and discussed.Comment: Proceedings of Physics of Evolved Stars 2015: A Conference Dedicated to the Memory of Olivier Chesneau, Nice, 8-12 June 201

Catalytic Studies of Sodium Hydroxide and Carbon Monoxide Reaction

We have studied the effect of ball milling on alumina mixed nickel, magnetite and Raney nickel on the reaction: 2NaOH(s) + CO (g) = Na2CO3 (s) + H2 (g) and determined the optimum particle size for the catalysts. The best performance was shown by a 2 h ball milled Raney nickel with average crystallite size of 209 Å. This reaction serves the dual purpose of carbon sequestration and yielding hydrogen gas

MN Draconis - peculiar, active dwarf nova in the period gap

Context: We present results of an extensive world-wide observing campaign of MN Draconis. Aims: MN Draconis is a poorly known active dwarf nova in the period gap and is one of the only two known cases of period gap SU UMa objects showing the negative superhumps. Photometric behaviour of MN Draconis poses a challenge for existing models of the superhump and superoutburst mechanisms. Therefore, thorough investigation of peculiar systems, such as MN Draconis, is crucial for our understanding of evolution of the close binary stars. Methods: To measure fundamental parameters of the system, we collected photometric data in October 2009, June-September 2013 and June-December 2015. Analysis of the light curves, $O-C$ diagrams and power spectra was carried out. Results: During our three observational seasons we detected four superoutburts and several normal outbursts. Based on the two consecutive superoutbursts detected in 2015, the supercycle length was derived P_sc = 74 +/- 0.5 days and it has been increasing with a rate of P_dot = 3.3 x 10^(-3) during last twelve years. Based on the positive and negative superhumps we calculated the period excess epsilon = 5.6% +/- 0.1%, the period deficit epsilon_ = 2.5% +/- 0.6%, and in result, the orbital period P_orb = 0.0994(1) days (143.126 +/- 0.144 min). We updated the basic light curve parameters of MN Draconis. Conclusions: MN Draconis is the first discovered SU UMa system in the period gap with increasing supercycle length.Comment: 14 pages, 20 figures, 8 tables, accepted for publication in Astronomy and Astrophysic

Kinetika rekristalizacije tijekom vrućeg oblikovanja čelika

The theory of kinetics of static recrystallization of steel during hot forming links the phenomenon to certain critical strain, grain size, strain rate, activation energy and temperature. The basic description is provided by the Avrami equation. An overview of equations used was compiled and comments on selected parameters prepared.Teorija kinetike statičke rekristalizacije čelika tijekom vrućeg oblikovanja ovu pojavu povezuje s kritičnom deformacijom, veličinom zrna, brzinom deformacije, aktivacijskom energijom te s temperaturom. Osnovni opis pruža Avrami jednadžba. Rad pruža pregled korištenih jednadžbi i raspravu pojedinih parametara

Kinetika rekristalizacije tijekom vrućeg oblikovanja čelika

The theory of kinetics of static recrystallization of steel during hot forming links the phenomenon to certain critical strain, grain size, strain rate, activation energy and temperature. The basic description is provided by the Avrami equation. An overview of equations used was compiled and comments on selected parameters prepared.Teorija kinetike statičke rekristalizacije čelika tijekom vrućeg oblikovanja ovu pojavu povezuje s kritičnom deformacijom, veličinom zrna, brzinom deformacije, aktivacijskom energijom te s temperaturom. Osnovni opis pruža Avrami jednadžba. Rad pruža pregled korištenih jednadžbi i raspravu pojedinih parametara

Математическая модель энергетических процессов в промышленной электрической отвертке

An electric screwdriver was designed to work in an automatic cycle on assembly lines. A characteristic feature of the screwdriver is the use of a low power motor in comparison with commonly used devices. The work of tightening the threaded joint takes place at the expense of the kinetic energy of the components of the drive system and the working screwdriver. It has been proved that the ability of the screwdriver to perform the tightening work is determined by the sum of the mass moment of inertia of the working components system and the mass moment of inertia of the motor's rotor, reduced to the axis of the screwdriver bit. The process of tightening is characterized by the number of screwing pulses, screwing torque values at the end of each pulse and the time of screwing process. The limitation of the value of the transmitted tightening torque takes place through the applied overload coupling.  The construction work of the screwdriver was preceded by the development of a mathematical model of the process of screwing and balance of torques acting during each phase of operation was carried out. This allowed the calculation of the value of the kinetic energy of components of the drive and operating system translated into the tightening work. The kinematic conditions to be met by the screwdriver at the end of a single tightening pulse were determined in order to accumulate kinetic energy and start another tightening pulse.Электрическая отвертка была разработана для автоматической работы на сборочных линиях. Характерной особенностью отвертки является использование двигателя малой мощности по сравнению с обычно применяемыми устройствами. Работа по натяжению резьбового соединения происходит за счет кинетической энергии компонентов системы привода и рабочей отвертки. Доказано, что способность отвертки выполнять затяжные работы определяется суммой массового момента инерции системы рабочих компонентов и массового момента инерции ротора двигателя, приведенного к оси наконечника отвертки. Процесс затягивания характеризуется количеством импульсов завинчивания, значениями момента завинчивания в конце каждого импульса и временем процесса завинчивания. Ограничение величины передаваемого момента затяжки происходит через применяемую перегрузочную муфту. Строительным работам по отвертке предшествовала разработка математической модели процесса завинчивания и балансировки крутящих моментов, действующих на каждом этапе работы. Это позволило рассчитать значение кинетической энергии компонентов привода и операционной системы в переводе на затяжные работы. Кинематические условия, которые должны быть выполнены отверткой в конце одного импульса затяжки, были определены для накопления кинетической энергии и запуска другого импульса затяжки

Lunar surface engineering properties experiment definition. Volume 3 - Borehole probes Final report, 20 Jun. 1968 - 19 Jul. 1969

Failure mechanisms associated with use of borehole jack in rock

Children's comprehension of distributive universal quantification

Our study explores why children are prone to assign a wider range of interpretations to sentences with distributive universal quantifiers each and everythan adults. Musolino (2009) proposed that children are more permissive than adults because they are prone to assign quantifier spreading interpretations to universally quantified sentences. Our results support the alternative hypothesis that children are more permissive because they are prone to assign cumulative interpretations to universally quantified sentences in a wider range of contexts than adults. Our results reveal that both children and adults assign cumulative interpretations to sentences with universally quantified objects (Three cowboys are pulling every horse), but children also tend to assign cumulative interpretations to sentences with universally quantified subjects (Every cowboy is pulling two horses). We show that children perform similarly with sentences with universally quantified NPs and sentences with numerical NPs (Three cowboys are pulling two horses). We argue that children are more permissive than adults because they are less likely than adults to perceive singular subject-verb agreement as a cue to distributive interpretation. We present a formal semantic model to explain our findings and discuss the implications of our model for recent acquisition research. (C) 2017 Elsevier B.V. All rights reserved