Materials Literature
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In this paper we present a scientific and technical review of existing methods of non-destructive testing applicable to the solution of a problem of determination of thickness of a protective layer of concrete and an arrangement of reinforcement bars in a ferroconcrete structures. The paper describes the main advantag…
官能团的保护和脱保护是诸多多步有机化学反应必须涉及的.文章报道了在温和条件下,磺酸功能化的介孔材料（SBA-15—SO3H）以及硅胶负载硫酸（SSA）均是有效的叔丁基二甲基硅基醚保护基团的脱保护催化剂.SBA-15—SO3H的循环使用效果优于SSA,而SSA的催化活性高于SBA-15—SO3H.
Gold nanoparticles are of interest in biomedical imaging applications due to their inert nature and ability to exhibit surface plasmon resonance. These phenomena can result in high near-infrared extinction (NIR) due to asymmetry or close interparticle spacings within gold structures, making these materials ideal for p…
The present doctoral thesis focused on the synthesis of amphiphilic calix[4]arenes, the study of their self-assembly properties at the air-water interface as Langmuir monolayers or in solution as nanoparticles and on the DNA-binding properties of the resulting self-assembled structures. The objective is to improve the…
Figure 5: Effect of ISO-1 and dexamethasone on ozone-induced lung inflammation. Cytokine mRNA (A, C, E & G) and protein (B, D, F & H) expression levels in the lung of ozone exposed and ISO-1- or dexamethasone-treated mice. KC (A&B), GM-CSF (C&D), TNF-a (E&F), and MIF (G&H). Data are expressed as mean±SD for 6 animals…
The influence of a deep-level-defect(DLD) band formed in a heavily Mg-doped GaN contact layer on the performance of Ni/Au contact to p-GaN is investigated. The thin heavily Mg-doped GaN(p++-GaN) contact layer with DLD band can effectively improve the performance of Ni/Au ohmic contact to p-GaN. The temperature-depende…
美国《现代轮胎经销商》（www.moderntiredealer.com）2015年6月10日报道：固铂轮胎橡胶公司旗下流行的Roadmaster RM230HH系列轮胎产品增加一个规格,以满足苛刻应用的需求,如伐木和采矿。该新规格为275/70R22.5,目前已经可以订购。固铂声称,275/70R22.5Roadmaster RM230HH轮胎（见图1）能防夹石子,18层级（负荷等级J）,花纹深度为17.46 mm（22/32英寸）,
本文介绍了纯氢热还原法分别用不同三价铁源在650℃下煅烧,同时采用自制电解槽电解产生的H2气为还原气氛合成了橄榄石型LiFexMg1-xPO4/C正极材料,采用X射线衍射光谱法(XRD),扫描电子显微镜法(SEM)和电化学手段对目标材料进行了结构表征和性能测试,并对比了两种方法所制备样品的物理性能和电化学性能。结果表明,纯氢气所制备包覆碳样品的离子导电率和电子导电率更低,比容量较高。并通过电化学阻抗谱对比了LiFePO4和LiFexMg1-xPO4/C的电化学过程。
The three-dimensional view of molecules at the atomic level provided by X-ray crystallography is not only ex- tremely informative but is also easily and intuitively understood by humans, who very much rely on their vision. However, un- like microscopy, this technique does not directly yield an im- age. The structural…
采用真空高频感应熔炼工艺制备了Cu-Ni-Mo合金,研究了Mo含量对合金组织、导热率和熔点的影响。结果表明,随着Mo含量的增加,合金晶粒变得更细小,并且合金中第二相含量先增加后减少。合金的导热率随着Mo含量的增加先升高后降低,Cu20Ni-3Mo合金的导热率最高,为35.875 W/m·k。合金的熔点随着Mo含量的增加而升高,但是变化不大。
The paper deals with the study of using the selective property of ultrasonic pulsating water jet for the disintegration of bone cement which creates the interface between femoral stem and trabecular bone tissue. For investigation, commercial bone cements were used. Bone cements were tested by nanoindentation in order…
We present an optimized particle-based computational method for studying kinetics, computing nucleation rate, and analyzing mechanism of both homogeneous and heterogeneous bubble nucleation. As a rare event, bubble nucleation is difficult to study with traditional computational method: a rare event is hard to happen d…
针对聚对苯撑苯并二唑（PBO）纤维的抗压性能差和成型困难等问题,提出并合成出一种新单体的前体化合物4-（5-硝基-6-羟基-7-甲基苯并唑-2-基）苯甲酸甲酯（MMNB）,总收率56.42%、纯度97.5%;可用于制备AB型单体和甲基改性PBO纤维,以改善PBO纤维的加工性能及热交联后提高轴向抗压能力。结果表明：对苯二甲酸单甲酯（MTA）先经酰氯化,然后在二氯甲烷溶剂中、三乙胺作缚酸剂与2-甲基-4-氨基-6硝基间苯二酚盐酸盐（MANR？HCl）缩合一锅法制备中间体4-[N-（2,4-二羟基-3-甲基-5-硝基苯基）氨甲酰基]苯甲酸甲酯（MNHB）,收率为73.65%;MNHB在二乙二醇二甲醚溶剂中多聚磷酸作用下环合脱水合成MMN…
以宝钢高炉渣为主料,辅以石英砂、氧化铬、氧化铁、氧化钛等,采用熔融—浇注法制备高炉渣微晶玻璃,利用DTA、XRD及SEM等测试手段对微晶玻璃样品的物相组成及显微结构进行了研究,并分析了晶核剂对微晶玻璃性能的影响。结果表明,微晶玻璃主晶相为硅灰石和透辉石的混合相,样品的各项性能均满足行业标准《JCT 872—2000建筑装饰用微晶玻璃》和《JCT 2097—2011工业用微晶板材》的要求。性能最好的Cr2O3、Fe2O3、TiO2复合晶核剂系样品的体积密度达到2.68 g/cm^3,吸水率〈0.1%,抗折强度达到142 MPa,耐酸、碱腐蚀分别为99.28%及98.41%。
选用高温固相反应法制备多晶样品Nd0.5Ca0.5Mn0.8，Al0.15O3.通过XRD表明样品为单相正交的钙钛矿结构，空间群Pnma．通过物理性质测量系统对样品M—F，M-H性质进行测量，表明低温下样品呈相分离态，磁有序的冻结温度为32K，铁磁团簇的自旋阻塞温度为4K．2K温度下有磁滞现象．
采用钛粉和氟硼酸钾为原材料制备Al-Ti-B合金,利用光学显微镜、扫描电镜测试分析手段,研究了反应温度对Al-Ti-B合金组织的影响。结果表明,合金中含有Ti Al3相和Ti B2相,Ti Al3相呈块状,尺寸15μm左右,Ti B2相呈片状,尺寸小于2μm,该合金对工业纯铝具有良好的细化效果。
We present the conclusion and decision of the motion equations of a dislocation segment, under the ultrasound and a constant load influence, fixed on forest dislocations, by the finite difference method in crystals such as NaCl. What will allow us to define the value acoustoplastic effect and predict strengthening or…
采用水热方法制备了1个新颖的混合配体铜（Ⅱ）配合物[Cu2（C7H3NO5）2（2,2′-bpy）2]n（C7H3NO5为2-羟基-3-硝基苯甲酸二价阴离子,2,2′-bpy为2,2′-联吡啶）,并通过单晶和粉末X-射线衍射、元素分析、红外光谱对其进行结构表征.配合物结晶于单斜的P21/c空间群,a=1.880 3（2）nm,b=1.860 6（2）nm,c=0.894 06（10）nm,β=92.671（2）°,V=3.124 5（6）nm3,Z=4.配合物中2个晶体学独立的Cu（Ⅱ）离子通过2-羟基-3-硝基苯甲酸二价阴离子拓展形成弯曲的一维链状结构.另外还测试了该化合物的热重和磁化率等磁性能,其分子中相邻的Cu（Ⅱ）离子之间…
The EU FCH-JU RESelyser project is concerned with the development of high pressure, high efficiency and low cost alkaline water electrolysers that can be operated variably and intermittently to meet the demands for integration into energy networks relying on fluctuating renewable energy. The project utilizes NiAlMo al…
Cyclodextrins (CDs) constitute a group of D-glucose-based host molecules with a hydrophobic cavity that can be used to form inclusion complexes with organic compounds. The Ling group has developed a group of amphiphilic glycodendrimers which have been shown to self-assemble into nanoparticles in water, and such system…