Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
我们在这个工作描述一条 alkyne-hydrosilylation 途径综合在端点的属于的一系列新奇 polysiloxane 方面链人员登陆艇或站在一起上 mesogenic 方面组。他们的性质被散布的 NMR， FTIR，胶化浸透层析， thermogravimetric 分析，微分扫描热量测定，极化的光显微镜学和小角度的 X 光检查描绘。这些获得的 alkenylsilane 连接了新奇人员登陆艇展出更高的玻璃转变温度和空地点，并且特别显示形成近晶的阶段的趋势，在有他们的比较常规 alkylsilane 的 nematic 阶段的强烈对比连接类似物，它表明具有由中胚叶发达的性质上的 alkenylsilane 连接和他们的…
Based on a hydrothermal method, the Ce3+/Tb3+ co-doped Ba Gd F5 nanocrystals were synthesized by controlling the introduction concentration of Ba2+ and Gd3+. The samples were characterized by X-ray diffraction(XRD), field emission scanning electron microscopy(FESEM) images, photoluminescence(PL) excitation, and emissi…
In order to investigate the mechanical properties and stress-strain curves of concrete at different ages under impact load,the impact compression tests of concrete at age of 1, 3, 7, 14 and 28 d were conducted with a large diameter split Hopkinson pressure bar, respectively. Based on statistical damage theory and Weib…
PANI@ZnS quantum dots composite materials were prepared by two steps. First,ZnS quantum dots were synthesized by hydrothermal method at a constant temperature of 150℃,and then PANI@ZnS composite quantum dots were obtained with the in situ polymerization of aniline. The products were characterized by X-ray diffractomet…
用连续统前後一致的领域理论(SCFT ) ，到二相同平行的表面上，飞机在一个中立答案沉浸的灵活对称的 triblock 聚合物的吸附被学习。各种各样的参数的效果例如接口粘合剂精力，聚合物作文和体积聚合物集中，在符合构造和聚合物的全部的吸附数量上被探索。接口粘附和粘合剂块的长度上的尾巴的数量的上的桥的数量的依赖两个都是非单调的，这被发现。四链符合构造的数量将近线性地可伸缩到共聚物体积集中。接口亲密关系和粘的块的长度上的吸附的结构行为的依赖的 nonequivalence 也被揭示。
The adsorptions of a series of alkali metal(AM) atoms, Li, Na, K, Rb and Cs, on a Si(001)-2×2 surface at 0.25 monolayer coverage have been investigated systematically by means of density functional theory calculations. The effects of the size of AM atoms on the Si(001) surface are focused in the present work by examin…
为有效资源利用的环境了解和一个成长要求鼓励没有润滑剂的形成的过程的实现。在完成干燥的表金属形成的第一个步骤是关于变化 tribological 条件获得知识并且识别相关影响参数。拉测试的通常使用的扁平的长带被选择在深拉过程的凸缘区域调查 tribological 条件。接触压力和变化绘画速度的影响因素在干燥、润滑的条件下面被分析。另外，工具和细工品表面被描绘。除润滑油以外，接触压力主要决定 tribological 条件。在润滑测试，更高正常的压力减少磨擦，而没有润滑油，更高的压力导致稍微增加磨擦。当润滑剂被使用时，改变绘画速度的 A 影响磨擦。在干燥实验，速度的影响都没被发现。表面描述的结果作为主要揭示粘附在干燥条件下面穿机制。…
We studied the effect of temperature on the survival and growth of juvenile Lutraria sieboldii [average shell height:( 2. 89± 0. 32) mm,average shell length:( 1. 77 ± 0. 21) mm] at salinity of 29. 0 and temperature of 8 ~ 34 ℃. The results reveal that the suitable temperatures for survival and growth of juveniles were…
结构，机械，电子，并且 NaZnSb 的结合的性质和阶段转变基于 ab initio 飞机波浪 pseudopotential 密度用概括坡度近似被探索功能的 theory.With 伪泛音 Debye 模型的帮助，我们探查 Gr ?????? 舀 ?
Carbon deposition and sintering of metal particles are the two dominating reasons for deactivation of the methanation catalyst. Based on the strong exothermic reaction accompanied by a large decrease in mole number and methanation mechanism, from the perspective of the matching of catalyst and reactor, this paper summ…
Porous surfaces on glasses have been proved to be effective in suppressing light reflection due to the continuous variation in the refractive index with thickness. The porous structures were fabricated on BK7 glass by neutral-solution leaching process, and broadband transmittance was measured by a spectrometer. An opt…
The properties of BaO/MgO-type interface in the BaZrO3/MgO(001) heterostructure are studied by aberrationcorrected high-resolution transmission electron microscopy combined with first-principles calculations.Experimental evidence demonstrates that cation displacement and vacancies occur at the interface. Our firstprin…
现在的调查的目标是有抗菌剂性质的 amphiphilic diblock 共聚物的合成和描述。-caprolactone (CL ) 和 tetrahydrofuran (THF ) 的戒指洞聚合(ROP ) 被面对亚锡的 octoate 把 L 半胱氨酸用作一个衔接的代理人在惰性的空气下面执行(同样多象催化剂一样。nano 银结束盖住 diblock 共聚物被综合由在 situ 方法。因此获得的 nano 银结束盖住衔接的L半胱氨酸 diblock 共聚物被象 Fourier 变换一样的各种各样的分析方法描绘红外线( FTIR )光谱学，原子磁性的回声( NMR )光谱学，圆形的二色性( CD )，荧光光谱学，胶化浸透层析( G…
4 Ni nanoframes ，从许多种类包含贡献(即， O 2 , H 2 O ， H +, OAm ，和 EDTA 4 )。由于磅的迷人的三维的几何学 4 Ni nanoframes 和 PtNi 4 多孔的 octahedra ，两个在太古的 PtNi 上侵蚀的 nanocrystals 显示出优异活动为在硝基苯的碱的媒介和加氢的乙醇 electrooxidation 的 10 nanoctahedra 。
In this paper,we reported a novel method for synthesis of non-oxide porous ceramics by using random copolymers as precursors.A silazane oligomer and styrene monomer were used as starting materials,which were copolymerized at 120 ℃ to form random polysilazane-polystyrene copolymers.The copolymers were then pyrolyzed at…
Polypyrrole coated carbon nanotubes(PPy/CNTs) were synthesized by the in-situ chemical polymerization of pyrroles on CNTs. Iron compounds were deposited on the PPy/CNTs to form an Fe-PPy-CNTs composite using ferrous ammonium sulfate as the iron precursor by liquid phase precipitation. Catalysts wherein iron-based comp…
The hydroiyzation reaction and thermal transformation of UF_4/KBr in air at ambient temperatures were studied by in-situ transmission Fourier transform infrared(FT-IR) spectroscopy.The infrared spectra for a series of different compounds containing uranium before and after reaction were obtained.Following hydrolysis o…
Y2O3∶ Yb / Tm / Gd@ Y2O3 microcrystals with core-shell structure were prepared by homogeneous precipitation method and then annealed at high temperature. The microparticles were characterized by transmission electron microscopy( TEM),X-ray diffraction( XRD),and luminescent spectra. Upconversion spectra and excitation…
The upconversion luminescence of Mn2 +doped transparent germanate glass induced by800 nm femtosecond laser at room temperature was investigated. The excitation and emission spectra show that the excitation process stems from the6A(6S) →4E(4G) /4A1(4G) transition while the emission originates from the4T1(4G) →6A1(6S) t…
Polyhydroxyalkanoates (公众房产管理局) 是许多微生物细胞内部地积累的自然 biopolyesters 的一个班。这些聚合物由于他们的好 biodegradability 和 biocompatibility 在生物医学、工业的应用作为绿塑料吸引了特别注意。(3-hydroxybutyrate-co-3-hydroxyvalerate )(PHBV ) Poly 是公众房产管理局的最普通的成员之一。然而，没有报告，从制片人的不同的组比较 PHBV 的性质，例如，细菌和 haloarchaea。在这研究，分别地， PHBV 共聚物的二种类型被喂不同的碳来源在 Halogranum amylolyticum 和…