Materials Literature
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A study of viscoelastic properties of basic acrylic materials StomAkril, Plastic colorless, Paladon 65 was carried out by low-frequency acoustic method at a frequency ν ~ 1Hz. The studies were carried out in the temperature range 250÷450 K. The effect of moisture on the mechanical properties of polymeric materials was…
Os semicondutores magneticos atrairam a atencao de muitos cientistas nos ultimos anos devido, principalmente, a aplicacoes tecnologicas no ramo da spintronica. Esses semicondutores podem ser desenvolvidos por meio de um processo chamado dopagem, onde alguns atomos da matriz semicondutora sao substituidos aleatoriament…
The ternary blend films composed of low polymerization degree poly[2,6-(4,4-bis-(2-ethylhexyl) - 4H-cyclopenta[2,1-b; 3,4-b']dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (LDP-PCPDTBT), [6, 6]-phenyl-C61-butyric acid methyl ester (PC61BM), and polymethylmethacrylate (PMMA) were fabricated with and without using 1, 8-…
Energy function with fracture energy, frictional energy, kinetic energy and elastic energy is proposed. And dynamic equations for continuum-discontinuum model in solid are obtained with the energy function and progressive failure constitutive model based on strain strength distribution. Combined with spring element mo…
Delivery of nano-objects to certain intracellular sub-domains is crucial for nanomedicine. Therefore delivery of nano-object to desirable cellular compartment has to be confirmed. The most valuable confirmation of the delivery comes from direct visualization of the nano-object. This visualization usually requires use…
记述了我国突颜蝗属1新种,蓝足突颜蝗Eotmethis cyanipes sp.nov.,模式标本保存于河北大学生命科学学院。蓝足突颜蝗,新种Eotmethis cyanipes sp.nov.(图1～2)新种因后足股节和胫节内侧全为蓝色而与所有已知种相区别。正模♂,宁夏石嘴山(39°15'N,106°41'E;海拔1180m),2003-07-20,李新江、王文强采。副模:1♂,2♀♀,分布及采集同正模。词源:新种种名源自蓝色和后足两个单词的拉丁语。
标题配合物[Sm（L）3（Phen）H2O]2（HL=1H-苯并三唑-1-乙酸;Phen=1,10-邻菲啰啉）是由SmCl3.6H2O、1H-苯并三唑-1-乙酸和1,10-邻菲啰啉经水热反应得到。采用元素分析、摩尔电导、红外光谱、热分析、X-射线单晶衍射手段对其进行表征。晶体结构表明：晶体属于单斜晶系,空间群为P2（1）/n。晶胞参数为：a=13.887 9（6）,b=12.973 4（5）,c=21.713 7（9）,α=90°,β=100.820（2）°,γ=90°。V=3 842.7（3）3,Z=2,Dc=1.602 Mg.m-3,μ=1.600 mm-1,F（000）=1 860。配合物中每个Sm（Ⅲ）与来自4个配…
В лабораторных условиях исследована возможность получения ряда товарных нефтепродуктов, с использованием технологии вакуумнойперегонки дистиллятного крекингостатка в смеси с остатком смолы пиролиза. В результатеполучены: нефтяной пек, сырье для получениятехнического углерода и нефтяной антисептикдля пропитки древесины.
通过控制制备过程中的洗涤次数，采用沉淀凝胶法制备了一系列不同钠离子含量的Co /SiO2催化材料，并采用X 射线衍射、N2吸脱附、X 射线能谱衍射、H2-程序升温还原、透射电镜和原子吸收光谱等多种表征手段系统研究了材料中残留钠离子对Co /SiO2材料的结构、分散性、氧化还原性和形貌的影响．结果表明，残留的钠离子使得样品比表面积下降，平均孔径增大，导致Co3O4的颗粒尺寸迅速增大．同时钠离子对Co3O4的还原具有抑制作用，使得样品的还原难度增大．结果导致Co /SiO2催化材料在乳酸酯加氢反应中的活性大大降低，同时造成丙酸乙酯副产物增加，对1，2-丙二醇( 1，2-PDO) 选择不利．
H2 production by selective decomposition of hydrous hydrazine over Raney Ni catalyst under ambient conditions
The primary aim of this project was to design cellulose fibre reinforced vinyl-ester resin composites with improved mechanical and thermal properties. The project reports on the fabrication of vinyl ester, eco-composites and eco-nanocomposites and characterises these samples in terms of their water absorption, strengt…
本文采用高温固相法合成了一种新型荧光粉SrCaSi04：Eu，Ce，并对其进行了光谱及荧光寿命衰减曲线的测试。结果表明：SrCaSiO4：0．005Eu2＋，0．01Ce3＋可和紫外LED相匹配发射蓝绿光，且在该体系中存在着Ce3＋到Eu2＋的能量传递；在荧光粉SrCaSiO4：Eu2＋中共掺Ce3＋将会使Eu2＋的荧光寿命增长，同时发现此体系的Ce3＋荧光寿命变短，这也证明了在此体系中存在着能量传递。
The crystal structure, electrical, and magnetic properties of the series of rare earth ternary intermetallic compounds R8CoAl3 (R = Y, La-Ho) and RNiAl3 (R = Y, Sm-Ho) have been investigated using powder X-ray diffraction, electrical resistivity, and magnetic susceptibility measurements. X-ray diffraction patterns rev…
A number of models have been developed to assess the risks of radionuclide accumulation in agricultural products and to determine the permissible levels of soil radioactive contamination. The proposed approach takes into account uncertainties of some parameters that describe the radionuclide content in different links…
Bone regeneration is a crucial event in bone tissue engineering, and bioactive scaffold has become a focused strategy in bone regeneration. Magnesium is a biodegradable and bioactive metal with needed mechanical strength for bone healing [1]. We designed and fabricated a biodegradable bioactive porous scaffold compose…
基于冷轧双相钢的生产工艺,采用ULAVC-CCT-AY-II连续退火模拟器对其进行退火,通过拉伸试验测试退火后的力学性能,并利用OLYMPUS-BX51金相显微镜和扫描电镜对热处理后的显微组织进行观察。结果显示：在760～780℃之间进行保温,缓冷温度设定为670℃,可获得铁素体加马氏体组织;添加Cr可以提高奥氏体的淬透性;预先再结晶处理改变了双相钢淬火后马氏体的形态和分布,得到较为均匀的F＋M双相组织。
采用Gleeble-3500热模拟试验机研究了Hastelloy C-276镍基合金在0．01～10s^-1、1000—1250℃、应变量0．7条件下的高温恒温压缩变形行为，对热压缩后的组织进行了金相显微分析。结果表明：C-276合金热变形流变应力随着应变速率的增大和变形温度的降低而增大。热变形过程中发生了动态再结晶，当温度r≥1200℃时，发生了完全动态再结晶，T〈1200℃时，发生部分动态再结晶。热变形流变应力可用Zener-Hollomon参数来描述，根据修正后的流变应力曲线建立了HasteltoyC-276合金峰值应力下的高温变形本构方程，热变形材料常数为：激活能Q=446．51kJ·mol^-1，a=0．0037346，…
This review investigates the current application limitations of Mg and Mg alloys. The key issues hindering the application of biodegradable Mg alloys as implants are their fast degradation rate and biological consideration. We have discussed the effect of some selected alloying element additions on the properties of t…
研究了一种Bi3．25La0．75Ti3O12（BLT）铁电存储材料纳米管的简单有效合成方法。通过阳极氧化铝模板（AAO）辅助溶胶凝胶法，合成了BLT纳米管。其基本过程是以次硝酸铋、硝酸镧和钛酸四丁酯为原料，以冰醋酸和乙二醇甲醚为溶剂配制BLT溶胶，然后将BLT溶胶滴在AAO模板表面，浸润后烘干并反复多次，而后将材料在500℃下保温1h，除去有机物，最后在750℃下保温30min晶化，用KOH腐蚀去除氧化铝模板，即得到BLT纳米管。结果表明，BLT纳米管具有[117]择优取向；BLT纳米管管壁光滑，直径与模板孔径相当，约300nm，且分布均匀，管壁厚度约25nm，纳米管是多晶体，由粒径为8～12rim晶粒组成。
The density-functional theory (DFT) within the full potential linearized augmented plane wave (FPLAPW) method is applied to study the two-dimensional achiral soft ferrimagnet [MnII(enH)(H2O)][CrIII(CN)6]·H2O. The phase stability, electronic structure, magnetic and conducting properties are investigated. Our results re…