Materials Literature
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An ultra-thin and broadband absorber which consists of periodic rings with gaps is proposed in this paper. The periodic rings are printed on the middle metallic layers in a four-layer substrate of total thickness is only 3.4 mm. Simulation results, which are gotten by using finite element method(FEM) and finite-differ…
Ti O2 manifested as nucleating agent was introduced in Ge-Sn-Se ternary chalcogenide glass by heat-melt method. Then the samples were heat-treated for different time. The experiment results indicated that heat treatment process can lead to the precipitation of Ge Se2 monoclinic crystals and Sn Se2 hexagonal crystals i…
Three-dimensional flowerlike ?-Ni(OH)2 nanostructures were successfully synthesized by the microwave-assisted reflux as short as 30 min. The crystalline structure and morphology of the products were characterized by X-ray diffraction, N2 adsorption-desorption isotherms, field emission scanning electron microscopy, and…
SO2-4–Mo O3–Zr O2–Nd2O3/Si O2(SMZN/Si O2) catalysts for the production of biodiesel via both esterification and transesterification were prepared and characterized by N2adsorption-desorption isotherms,X-ray diffraction(XRD),scanning electron microscopy(SEM),thermogravimetry analysis(TGA),ammonia adsorption Fourier tra…
白光照亮的围单人赛的碳 nanotubes (SWCNT ) 应该由于散布的回声瑞利显得有颜色。然而，底层上的 SWCNT 的真彩成像没被报导，因为 SWCNT 和散布的强壮的底层的极其低的散布紧张。这里，我们证明散布的瑞利能被接口偶极子改进效果极大地提高。底层上的因而丰富多彩的 SWCNT 能被宽地 supercontinuum 激光照明直接在一台光显微镜下面想象，它便于单个 SWCNT 的高产量 chirality 赋值。这条途径，称为的瑞利成像显微镜学，没被限制为 SWCNT，但是对许多 nanomaterials 广泛地适用，它使丰富多彩的 nanoworld 能在光显微镜下面被探索。
A 1D-carbon/carbon composite(C/C) with an organic-modified nanoclay filler was fabricated by hot-pressing and densification at temperatures of 1 000,1 100,1 200 and 1 300 ℃.The organic modified nanoclay was prepared by substituting ions between the layers of an inorganic clay with an organic quaternary ammonium salt.T…
Using nanoscale electrical-discharge-induced rapid Joule heating, we developed a method for ultrafast shape change and joining of small-volume materials. Shape change is dominated by surface-tension-driven convection in the transient liquid melt, giving an extremely high strain rate of N106 s-1. In addition, the heat…
With the reflected caustics experiment,the dynamic fracture induced by impact loading of some specimens was studied. These specimens processed by mirror transplantation,were made of natural metamorphic rock including white marble,slate and griotte,and rock-like materials including man-made rock and harden cement paste…
ZSM-5 催化剂的物理性质上并且在他们为到 aromatics 变换的甲醇的活动的碱的处理的效果被调查了。一个温和碱的处理(0.2 和 0.3 mol/L NaOH ) 在酸味上没有明显的效果在父母沸石创造了 mesopores。mesopores 的存在为 aromatics 给催化剂更长的一生和更高的选择。有 0.4 mol/L NaOH 的处理减少了 Br 的数字 ? nsted 酸地点由于 dealumination 和 desilication，它导致了更低的释放率。另外，更多的 mesopores 比与温和碱的处理被生产。作为结果，与 0.4 mol/L NaOH 对待的样品的一生是乘父母 ZSM-5 的的几乎五。有…
以电子万能试验机得到的橡胶材料的应力-应变曲线为原始数据,在Abaqus有限元分析软件中拟合了17种高弹性本构方程,对比了各本构模型的拟合结果和稳定性,分别将其作为材料模型,对含裂口的纯剪切试件裂纹尖端的J积分进行分析,并将计算结果与实验数据进行了对比.研究表明,本构模型对于裂纹尖端的J积分数值影响较大,各个模型的分析精度有所不同,故在橡胶材料的有限元分析中需要特别注意材料模型的选取.
A novel phosphor of un-doped Sr Zr Si2O7 material with blue long lasting phosphorescence which could be recorded for about 5400 s(0.32 mcd/m2) was developed. It revealed that both the emission centers and traps levels were related to the oxygen-deficient defects which were induced in reducing atmosphere. The filling a…
We discuss approaches based on the concepts of local electron pairing and the superconducting properties which they imply. The nature of the intermediate coupling regime is addressed and a recent progress in the BCS–Bose superconductivity crossover problem is outlined. We also survey the properties of systems with loc…
The solid acid catalyst, N–F codoped Ti O2/Si O2 composite oxide was prepared by a sol–gel method using NH4 F as nitrogen and fluorine source. The prepared materials were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), UV–Visible diffuse reflectance sp…
The vertical motion control of the roll was studied in order to improve the accuracy in simulation of variable gauge rolling. The discretization was carried out in the transition zone of TRB according to the principle of volume invariance. Based on this assumption, the formula for time step of vertical motion of rolls…
The Cu-Ni-Al powders are prepared by atomization method, are hot pressing sintered in the vacuum furnace to prepare the porous Cu-Ni-Al alloy. The microstructure, high-temperature compressive deformation behavior and its effect factors are investigated,respectively. The deformation mechanism of the porous Cu alloy is…
The microstructural changes of Fe83Si4B13 amorphous mother alloy during the heating process were investigated by Laser Scanning Confocal Microscopy（ LSCM）,and the phase transformation was determined by the Thermo-Calc calculations. The differences in the melting points measured by Differential Scanning Calorimetry（ DS…
A new metal-organic framework compound,[Zn2( BPDC)( IN)2]( H2 BPDC = biphenyl-4,4'-dicarboxylic acid,HIN = isonicotinic acid),was synthesized by self-assembly of mixed ligands and Zn( Ⅱ)under hydrothermal conditions and characterized by means of single-crystal X-ray diffraction,X-ray powder diffraction,thermogravimetr…
The research on synthesis of aromatic heterocycllic structural flame retardant polyether polyols in the recent these years,which improved the flame retardancy of rigid polyurethane foam,were reviewed,such as benzene ring,imino triazine ring,isocyanurate ring,and so on. The future development in the field was predicted…
The corrosion behaviour of low alloy steel containing Ni and Cu was studied because it is a promising candidate canister material for the disposal of high- level radioactive waste(HLW) in China. Due to the intensely radioactive nature of HLW, the waste has to be prevented from reaching the biosphere for many tens of t…
我们在电子上抽的多重 graphene 层(MGL ) 建议表面电浆子(SP ) 结构，并且计算动态电导率和吸收系数的功能。同时，不同因素上的吸收系数的依赖被模仿。当吸收系数是否定的时， SP 能得到获得，并且 SP 获得能被阴沉的温度提高，使用高偏爱电压并且选择有合适的层数字和长动量松驰时间的 graphene。SP 获得上的学习是有希望的在放大器和基于 graphene 的电浆子设备被过去常。