28 Works

Multiscale simulations of novel additive manufactured continuous fiber-reinforced three-component composite material

A.U. Zobacheva, A.S. Nemov & A.I. Borovkov
The paper is dedicated to simulation of novel three-component composite material obtained by layer-by-layer 3D printing mechanical behavior on the basis of detailed reproduction of its microstructure. Results of numerical study of the microstructure parameters influence on the mechanical characteristics of the composite material produced by 3D printing are presented and discussed.

СТРУКТУРА И МИКРОТВЕРДОСТЬ ДВУХСЛОЙНЫХ КОМПОЗИТНЫХ ФОЛЬГ ИЗ НАНОДВОЙНИКОВАННОЙ МЕДИ С НАНОВКЛЮЧЕНИЯМИ ГРАФЕНА

О.Ю. Курапова, В.Г. Конаков, А.С. Гращенко, Н.Н. Новик, С. Н. Голубев, А.В. Орлов & И.А. Овидько
В работе двухслойные композитные медные фольги были получены электрохимическим осаждением на постоянном токе из суспензий графит-графеновой смеси, стабилизированных неионными поверхностно-активными веществами ПАВ (Pluronic F-127, полиакриловая кислота - ПАК). Методом сканирующей электронной микроскопии изучена микроструктура внешней стороны фольг, а с помощью атомно-силовой микроскопии - микроструктура их обратной стороны. Методом рентгенофазового анализа доказано, что в случае фольг, полученных из суспензий, содержащих Pluronic F-127, осаждение тонкого слоя медной подложки приводит к росту двойникованных кристаллов меди. С помощью Рамановской...

Sr-doping effect on apatite type La10Si6O27 electrolyte: experiments and ab-initio calculation

Yangzhou Ma, Nouredine Fenineche, Omar Elkedim & Michel Moliere
Apatite-type lanthanum silicates draw researchers’ attention due to their good performance as electrolyte materials for IT-SOFC (intermediate temperature solid oxide fuel cells). In this paper we present Sr-doping effect on La10Si6O27 (LSO) via experimental method and ab-initio calculation: the samples were prepared through an optimized water-based sol-gel process. High purity, crystallinity compounds with and without Sr-doping LSO are obtained and the resulting materials were characterized by scanning electron microscopy, X-ray diffraction and energy-dispersive X-ray spectroscopy....

Investigation of a twin entry mixed flow turbine volume, benefits with regard to the eco-system

M. Hamel, M.M. Bencherif & M. K. Hamidou
Mixed-inflow turbines are suitable for many applications, where compact power sources are required with higher boost pressure. Realizing the growing importance and availability of road vehicles operating over wide range of speeds and loads, our point of particular interest must be a reduction of gas pollutants which could be achieved by exploring different design possibilities in order to increase the machine efficiency. This will certainly lead to a decrease in fuel consumption resulting in a...

Sr-doping effect on apatite type La10Si6O27 electrolyte: experiments and ab-initio calculation

Yangzhou Ma, Nouredine Fenineche, Omar Elkedim & Michel Moliere
Apatite-type lanthanum silicates draw researchers’ attention due to their good performance as electrolyte materials for IT-SOFC (intermediate temperature solid oxide fuel cells). In this paper we present Sr-doping effect on La10Si6O27 (LSO) via experimental method and ab-initio calculation: the samples were prepared through an optimized water-based sol-gel process. High purity, crystallinity compounds with and without Sr-doping LSO are obtained and the resulting materials were characterized by scanning electron microscopy, X-ray diffraction and energy-dispersive X-ray spectroscopy....

Scaling of low field magnetoelastic hysteresis in antiferromagnetic Dy

Iu. Liubimova, M. L. Corró, J. Torrens-Serra, V. Recarte, J.-I. Pérez-Landazábal & S. Kustov
We investigate reversible inverse magnetostriction in order to study scaling properties of magnetic hysteresis in the helical antiferromagnetic phase of polycrystalline Dy. We argue that the experimental method used is more sensitive than studies of conventional magnetic hysteresis. This advantage allows us to study hysteretic properties of antiferromagnetic Dy over the temperature ranges, not accessible previously. We introduce generalized coercivity of magnetoelastic hysteresis and show that it demonstrates, under different experimental protocols, the same exponents...

СТРУКТУРНЫЕ АСПЕКТЫ УСИЛЕНИЯ НАНОСТРУКТУРИРОВАННЫХ КОМПОЗИТОВ ПОЛИМЕР/2D-НАНОНАПОЛНИТЕЛЬ

Г.В. Козлов & И.В. Долбин
Показано, что в рамках перколяционной модели усиления полимерные наноструктурированные композиты делятся на три класса: истинные и промежуточные нанокомпозиты, а также микрокомпозиты, причем один и тот же композит может относиться к разным классам в зависимости от содержания 2D-нанонаполнителя (его структуры). Эффективные модули упругости 2D-нанонаполнителя и межфазных областей существенно снижаются в указанной последовательности, что и определяет уменьшение общего модуля упругости этих наноматериалов. Модифицированное правило смесей, оперирующее реальными, а не номинальными, характеристиками компонент композита, корректно описывает модуль упругости...

Photoluminescence of Hg0.5Cd0.5Te structures grown with molecular-beam epitaxy

A.O. Timoshkov, N.L. Bazhenov, K.D. Mynbaev, V.S. Varavin, M.V. Yakushev, N.N. Mikhailov & S.A. Dvoretsky
Photoluminescence (PL) of Hg1-xCdxTe-based ( x ~ 0.5) structures grown with molecular-beam epitaxy on GaAs and Si substrates was studied. The studied structures appeared to have substantial compositional fluctuations, which at low temperatures ( T < 200 K) strongly affected the value of “optical” bandgap obtained in the experiment. Comparison of the experimental results with the data available in the literature showed that such fluctuations were in general typical of Hg1-xCdxTe with x ~ 0.5...

Density calculation of ionic liquids

G. Reza Vakili-Nezhaad, Aaisha M. AlAisaee, Manar A. AlJabri, Shahd S. AlBarwani & Zainab K. AlJahwari
Recently, an interest from both academia and industry has been moved toward ionic liquids due to their environmentally friendly characteristics as green alternative for traditional volatile organic solvents (VOCs). In addition, because of their wide range of physicochemical properties they found unique applications in renewable energy sector. For using such substances, one needs reliable correlations for predicting their physical properties. In the present work, a new method for determining the density of ionic liquids has...

Residential scale solar driven cooling systems versus conventional air-conditioning in hot arid areas: a comparative study

Ahmed Hamza H. Ali & Ali Nasser Alzaed
In this study, performance, energy efficiency, cost competitiveness, and global warming assessments of residential scale solar thermal and off-grid Photovoltaic driven DC air-conditioning systems versus conventional AC driven air-conditioning system in hot, arid areas is carried out. The first system is an integrated solar thermal driven residential air-conditioning. This system consists of evacuated tube solar collector arrays of area 36 m2 with high reflective parabolic surface used at the back, a silica gel-water adsorption chiller...

Shape memory Cu-Al-Ni single crystals for application in rotary actuators

A.I. Priadko, V.I. Nikolaev, S.A. Pulnev, S.I. Stepanov, A.V. Rogov, A.V. Chikiryaka & O.A. Shmakov
Physical and technical potential of shape memory single crystals for applications in rotary actuators was experimentally studied. Single-crystalline Cu-Al-Ni cylindrical rods for tests and actuator applications were grown from melt by Stepanov method. The crystals were tested by tension under conditions simulating their work in the proposed design of a rotary actuator. Actuator performance parameters such as rotation angle, torque and useful work were estimated basing on experimental results. Actuators employing shape memory effect outperform...

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