Materials Literature
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The transition from vortex glass to a liquid phase is studied in Ba Ni0.1Fe1.9As2 single crystal with Tc = 19.4 K by magneto-resistance measurements. The resistivity curves are measured in magnetic fields in a range of 0 T–13 T for H c and H⊥c. Good scalings for all values of resistivity ρ(H, T) and the effective pinn…
We observed the linear-to-zigzag structural phase transition of a40Ca+crystal in a homemade linear Paul trap. The values of the total temperature of the ion crystals during the phase transition are derived using the molecular-dynamics(MD) simulation method. A series of simulations revealed that the ratio of the radial…
采用氨基酸钠游离的氨基引发e-己内酯单体开环得到酯肽齐聚物,并以六亚甲基二异氰酸酯为扩链剂,将这些齐聚物扩链合成4种聚酯酰胺.将4种天然氨基酸（L-丙氨酸、L-亮氨酸、L-谷氨酸、L-赖氨酸）引入到聚（e-己内酯）（poly（e-caprolactone）,PCL）中,合成和表征了4种含有氨基酸残基的聚合物.通过1H-NMR、FT-IR、水接触角、水吸收率和降解实验对该聚酯酰胺进行了表征.实验结果表明：经氨基酸改性PCL的亲水性和降解性得到了改善,其中含有L-赖氨酸残基的聚酯酰胺因亲水性最高,降解速率最快.
X-ray powder diffraction is as a powerful tool for structural analysis of crystalline compounds which do not grow as single crystals, but a polycrystalline bulk. When applied under non-ambient conditions, or when data are collected at consecutive time intervals, X-ray powder diffraction can be readily turned into a va…
Magnesium hidroksida mempunyai prospek dan manfaat sebagai bahan baku penyimpan gas hidrogen, bahan baku pembuatan magnesium oksida (MgO), dan obat maag. Magnesium dipisahkan berdasarkan metode elektrolisis. Hasilnya berupa magnesium hidroksida. Penelitian ini bertujuan untuk mengendapkan magnesium hidroksida melalui…
叙述了热塑性弹性体（TPE）的结构特点、品种和性能,并对其中的主要品种TPS、TPO、TPV、TPU、TPEE、TPVC、TCPE以及TPA等进行了分别介绍.简述了TPE的不足与今后的发展方向.指出,TPE作为一种节能环保的橡胶新型原料,发展前景十分看好.
The world’s increased energy storage demand, as well as the environmental concerns related to the combustion of fossil fuels, has triggered a transition to intermittent renewable energy sources as well as to electrical and hybrid vehicles. Current day rechargeable batteries are, due to the invention and development of…
Wa nym aspektem technologicznym w produkcji generatorow pr dotworczych jest dobor odpowiednich materia ow konstrukcyjnych, bowiem od nich zale y wysoka sprawno energetyczna i niezawodno dzia ania tych urz dze . Interkonektor stanowi podstawowy element sk adowy ogniwa paliwowego, poniewa doprowadza on poprzez system ka…
以对氨基苯磺酸（PAS）、三聚氰胺（M）和甲醛（F）为原料,采用三步合成反应工艺合成了对氨基苯磺酸-三聚氰胺-甲醛树脂（PASMF）。研究结果表明：按照n（M）∶n（PAS）∶n（F）=1∶1.4∶5配比,设置羟甲基化阶段的反应温度为70℃、反应时间为1.5 h和pH为8.5,酸性缩聚阶段的反应温度为80℃、反应时间为1 h和pH为6,碱性重整阶段的反应温度为75℃、反应时间为1 h和pH为8.5,合成的PASMF综合性能良好;当w（PASMF）=1.0%（相对于水泥质量而言）时,水泥具有较好的分散性,水泥净浆初始流动度达240 mm。
Recently, there has been considerable interest in forming Filler as a means to improve several properties of Elastomers. For this purpose layered (CaCO3 and Stiric Acid "S.A" ) are now widely being used. These layered are a class of inorganic materials that are naturally layered in structure , 8 different rubber compo…
Increasing demand for light and durable materials in home and office furniture requires optimizing the properties of the products used. In this research the effect of skin type and core on mechanical properties of light weight sandwich panel was investigated. The skins were made of MDF with 3, 6 and 8 mm thickness, pa…
Applications often input data for processing and output processing results. Data is input from a file or some other source and is output to a file or some other destination. Java supports I/O via the classic I/O APIs located in the java.io package and the new I/O APIs located in java.nio and related subpackages (and j…
MPO4∶ Eu3+,Bi3+/Tb3+(M = La,Gd,Y) phosphors were synthesized by conventional solid state reaction.The structures of the samples were characterized by X-ray diffraction(XRD).The results indicate that YPO4crystallizes is cubic structure while LaPO4and GdPO4are monoclinic structure.The difference between the emission spe…
The cover picture shows two types of decatetraene diketone structures that are basic skeletons of natural products found in many plants such as carotenoids. A novel and stereoselective strategy for the synthesis of decatetraene diketone derivatives from pyrylium salts has been illustrated. Reduction of α-active pyryli…
The present study is devoted to synthesis and investigation of basic properties of ferroelectric thin films. The sol-gel-type chemical solution deposition method was used for preparation of (Ba$_{0.6}$Sr$_{0.4}$)TiO$_{3}$ (BST) thin films. The thin films were characterized in terms of their microstructure, crystalline…
Özet. Bu çalışmada, elektronların akustik fononlar ile etkileşmesinden kaynaklanan kiral polaron oluşumu incelenmiştir. Elektron-fonon sistemlerinin taban durumunu hesaplayabilmek için Lee-Low-Pines teorisi çerçevesinde analitik bir metot geliştirilmiştir. Grafenin dejenere band yapısının kiral polaron oluşumunu deste…
On the base of 3D finite elements models of compressor blade with damages his vibration state is investigated. The modeling of objects was spent on the basis of the three-dimensional approach of a finite elements method with the use of the special singular finite elements that account for the stress localization affec…
The role for protein dynamics in the transition states (TS) of enzyme reactions has been debated over decades. Dihydrofolate reductase (DHFR) catalyses the NADPH-dependent reduction of dihydrofolate to tetrahydrofolate and has long been considered a paradigm of enzymology. Numerous studies on DHFR have provided strong…
为改善无钴AB，储氢合金La1-xPrxNi4.2Mn0.3Al0.3Cu0.15Fe0.05的循环性能，采用XRD、SEM等分析方法以及恒电流充放电等电化学测试技术，研究了系列La1-xPrxNi4.2Mn0.3Al0.3Cu0.15Fe0.05（x=0-0．3）合金的结构和电化学储氢性能。结果表明：制备的合金为单一的CaCu，结构，随着Pr替代La含量的增加，晶胞的口轴、C轴和晶胞体积均逐渐减小，c／a值逐渐增大。相应合金的放电容量有所降低，但合金电极的循环稳定性和高倍率放电性能得到明显改善。100个循环后的容量保持率S100分别为47．28％（x=0）、48．22％（乒0．1）、50．79％（x=0．2）和54．47％（x=…
Dye sensitized solar cells (DSCs) have received considerable attention once this technology offers economic and environmental advantages over conventional photovoltaic (PV) devices. The PV performance of a DSC relies on the characteristics of its photoanode, which typically consists of a nanocrystalline porous TiO2 fi…