Materials Literature
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用压痕-淬冷法测定不同LaPO4含量的LaPO4-ZrO2复合陶瓷的抗热震性能,通过扫描电镜观察不同温度热震后的裂纹扩展形态。结果表明,1550℃烧结的复合陶瓷中LaPO4含量为20vol%时,临界热震温差约为400℃,比纯氧化锆陶瓷约高出150℃。弱界面的数量和尺寸对复合陶瓷的热震性有着重要的影响。适当尺寸弱界面以及LaPO4颗粒的存在使裂纹扩展阻力增大,热震裂纹在弱界面处的偏转及分叉耗散了主裂纹扩展能,从而改善了复合材料的热震性能。
Thermoelectric materials are characterized with the figure of merit, ZT = S2σT/κ, where T is the temperature, S the Seebeck coefficient, σ the electrical conductivity and κ the thermal conductivity. Many researches have been focused on reducing lattice thermal conductivity through increasing phonon scattering at inter…
Polyvinyl alcohol (PVA) films were prepared on pre-cleaned glass substrates by solution growth technique. Sandwich structures of the type Aluminium – PVA – Aluminium were formed to study the Thermally Stimulated Discharge Current (TSDC) and pyroelectric behaviour of PVA thin films. Aluminium (Al) electrodes were depos…
The study of butadiene polymerization at the catalyst system TiCl4-Al(i-C4H9)3 was carried out in a pulsed mode of the process which ensured a short time of polymerization. It was found that at the time of polymerization 5-6 with titanium catalyst system is kinetically heterogeneous and contains at least three types o…
Colloque avec actes et comité de lecture. Internationale.
O cancro é uma das mais conhecidas e temidas doenças existentes e, como tal, existe um grande interesse no desenvolvimento de métodos de tratamento das afeções tumorais. Os grandes avanços da quimioterapia têm dado ótimos resultados no tratamento do cancro. Contudo, a administração de fármacos antineoplásicos não gara…
Sejauh ini belum banyak alternatif lain selain semen Portland yang dapat diterima oleh masyarakat sebagai bahan pengikat pada konstruksi beton. Dilain pihak, proses produksi semen Portland selain menimbulkan pencemaran udara melalui gas CO2, juga memerlukan energi yang tinggi yang berakibat kepada tingginya harga seme…
In the article the comparison between a method of definition of capillary characteristics of textile materials and a method of definition of washing ability of binary solutions of PEAHENS is presented. For textile materials the most popular using method is the indirect method of an estimation of wetting by means of he…
Целью работы являлось решение актуальной задачи определения предельного содержания реагирующих веществ, обеспечивающего безопасность реализации процесса реакционного механического легирования.
Визначено структуру та основні етапи розробки металогідридних систем для енерготехнологічної переробки водню, що дає можливість провести розрахунки роботи системи та повністю визначити комплекс конструктивних та режимних параметрів, які характеризують її загальну ефективність.
TiO2 is a material with attractive properties which have led to various applications such as anti-reflective coatings [1] or self cleaning surfaces [2]. One of the most applied deposition techniques used for TiO2 is reactive magnetron sputtering. Unfortunately TiO2 suffers from a comparatively low deposition rate when…
采用标准电子陶瓷工艺制备了(Mg0.95Zn0.05)2(Ti0.8Sn0.2)O4陶瓷。研究了(Mg0.95Zn0.05)2(Ti0.8Sn0.2)O4陶瓷的烧结特性、相结构和微波介电性能。采用X射线衍射分析其物相组成,利用SEM观察其显微结构。XRD图谱表明烧结样品为立方尖晶石(Mg0.95Zn0.05)2(Ti0.8Sn0.2)O4结构,晶胞参数为a=b=c=0.848794nm。实验结果表明,随烧结温度升高,样品相对介电常数(er)和品质因数(Q.f)先增加后减小,谐振频率温度系数(τf)变化不大。1325℃/5h烧结样品具有优良微波介电性能:er=13.1,Q.f=131170GHz(10GHz)、τf=-55.6×10…
Photocatalytic conversion of water to hydrogen and oxygen is a promising avenue for the production of fuels from solar energy. While many semiconductors can absorb solar photons and catalyze the production of hydrogen and oxygen from water, the process typically produces hydrogen at low rates because of inherent defic…
Sonofusion phenomenon will not be achieved unless there is an appropriate host media. To increase the probability of sonofusion reaction, the cavitating bubble’s radius must be as large as possible and due to the bubble collapse, it produces intense shock waves. In this paper, the effective parameters in sonofusion me…
Influence of gases (Ar, He, N2, SO2, O2) and sodium nitrite on the intensity of the solid-state and nitrogenous components of terbium sulfate triboluminescence was studied. A saturation by SO2 and addition of sodium nitrite crystals lead to suppression of the both components. Oxygen suppresses the nitrogen linesonly.…
The synthesis temperature affected the properties and photo catalytic activity of Tantalum (V) nitride (Ta3N5) nanoparticles for hydrogen evolution. The Ta3N5 prepared at lower temperature showed higher photo catalytic activity due to the lower particle size and higher surface area.
Создана экспериментальная установка для измерения времен затухания люминесценции\nредкоземельных ионов в конденсированных средах (кристаллах, стеклах и растворах). С\nиспользованием методики, позволяющей устранить влияние перепоглощения излучения,\nпроведены измерения времени затухания люминесценции ионов Yb3+ в крист…
Regenerative titanium dioxide (TiO2) photoelectrochemical solar cells are regarded as a potential low-cost alternative to conventional solid-state photovoltaic devices such as silicon-based solar cells, However, charge collection and transport in TiO2-based devices is poor - significant charge recombination occurs due…
In this paper, the processes of birth, decay and formation of stable polytetrahedral nanoclusters in the structure of amorphous alloy Cu80Zr20 in the process of quenching from the liquid phase are studied by the molecular dynamics method
The influence of microwave frequencies at high temperature on the structural properties of Boron Nitride (BN) powder had been investigated. Crystallite size, microstrain and the graphitization index (G.I.) were determined before and after the microwave measurements. The x-ray diffraction patterns showed a remarkable i…