Materials Literature
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It is considered results of the researches on definition of firmness of cement-soil mixes on the basis of loessial grounds in salt solutions of magnesium sulphate (MgSO4·H2O) in the article. It is defined that stability of samples from a cement-soil mix with 15% Portland-cement dosages in the corrosive medium is more…
利用分子动力学模拟研究了低于室温下低能C原子碰撞金刚石（100）和（111）面的微观过程．模拟中采用Brenner导出的多体参数化势．并采用Langevin分子动力学方法模拟系统的退火过程．结果表明，在100K温度下，当入射C原子能量降至0.leV时，易于在（111）面生长近完美的金刚石单层．时（100）面，需更高的能量形成类金刚石SP^3杂化结构．
The highly reactive polyisobutylenes(PIBs) withα-double bonds(87.5 mol%) or tert-chloro(tert-Cl) groups(95 mol%) could be prepared via the cationic polymerization of isobutylene(IB) coinitiated by BF_3 or TiCl_4 respectively.The Friedel-Crafts alkylation of diphenylamine(DPA) with the highly reactive PIB withα-double…
There is an urgent need to develop new non-chromating coating methods for the corrosion protection of aluminum alloys, and this thesis reports studies to establish optimal working conditions for forming zinc phosphate coatings on 6061-T6 aluminum alloy. Scanning electron microscopy (SEM), X-ray photoelectron spectrosc…
采用金相、扫描电镜、能谱和DSC分析方法研究了新型Al-Mg-Cu铝合金（以下简称A铝合金）半连续水冷铸锭均匀化处理过程中相的变化。结果表明，A铝合金半连续铸锭的铸态组织中存在大量非平衡凝固的含从CuMg和Al2Cu的共晶相，其熔化温度为505℃；在595℃ 12h均匀化过程中，该合金铸锭中非平衡凝固共晶相发生溶解，合金中铸造过程形成的非平衡凝固共晶体Al2Cu全部消失，但Al2CuMg相不能完全溶解。
Stimuli responsive block copolymers can provide a variety of applications due to their high sensitivity in detecting targeted species. Among of these studies, conjugated rod-coil block copolymers have attracted considerable attention because of their electronic and optoelectronic properties could be efficiently manipu…
采用固相法制备了ZnO压敏陶瓷,采用X射线衍射(XRD)与扫描电镜(SEM)对相组成和微结构进行了研究。结果表明:掺杂适量的SiO2可以促进晶粒均匀生长,提高微观结构的均匀性,使非线性系数增加,有利于晶界玻璃化,提高稳定性并减小泄漏电流;掺杂过量的SiO2会抑制晶粒长大,有利于提高压敏电压,但会因晶界相过于丰富导致泄漏电流大幅提高。样品烧结密度在SiO2含量为0.7 wt%达到最大值。
Recently, the nanotip arrays are widely researched on due to its wide application in nano-electronics, field emission, sensors and etc. They are usually fabricated by a combination of DRIE (Dry-Reactive-Ion-etching) and FIB (Focused-Ion-Beam) processes. However these processes require many fabrication steps, are high…
Poly(organophosphazenes) have potential applications in making water-soluble and biocompatible quantum dots (QDs) due to their wide variety of properties. The CdSe QDs of green emission and the core-shell CdSe/ZnS QDs of red emission were prepared. Subsequently the trioctylphosphine oxide-stabilized CdSe/ZnS QDs were…
In this investigation, an complex perovskite structure Ba(FeNb) 0.5O3 (BFN) was chosen as the host material and doped with uni-valence Na+ and K+ ions which substitute the Ba2+ ion to form Ba1-xNax(Fe0.5Nb0.5)1+x/4O3 (BNFN) and Ba1-xKx(Fe0.5Nb0.5)1+x/4O3 (BKFN) ceramic using a solid state reaction. The XRD results ind…
We have grown PbMg1/3Nb2/3O3-PbTiO3(PMN-PT) thin films by radio frequency(RF) sputtering deposition at 550 ℃-650 ℃ on Pt/Ti/SiO2/Si and TiO2/Pt/Ti/SiO2/Si substrates.The phase compositions and microstructure of thin films were characterized by X-ray diffraction(XRD) and scanning electric microstructure(SEM).The effect…
In this work, the effect of calcination temperatures on phase formation andmicrostructure of (Ba0.6 Pb0.4)TiO3, (BPT) powders was investigated. BPT powders wereprepared via combustion technique by using urea as a fuel. The raw materials were heated atvarious calcination temperatures ranging from 700 to 1,150 oC for 2…
研究烧结助剂ZB玻璃对CLLNT陶瓷的烧结特性、相结构、微波介电性能的影响。结果表明，添加适量的zB玻璃可把GLLNT陶瓷的烧结温度降低400℃，并且获得较高的介电常数。ZB玻璃添加量为1～5wt％时不影响该陶瓷体系的主晶相，依然是斜方钙钛矿相。掺杂4wt．％ZB玻璃的CLLNT陶瓷在1000℃烧结3h，可获得较好的介电性能：介电常数er=97，tg θ=0．029，TCF=-15ppm／℃（1MHz）。
采用亚快速定向凝固装置成功地制备了Ti-47.5Al-2Cr-2Nb-0.2B合金定向凝固试样,观察了不同凝固速率下的固液界面形貌、过渡区和稳态区凝固组织。实验结果表明,在2μm/s抽拉速率下,合金界面以胞状界面形态生长,全片层组织（γ＋α2）取向与生长方向成0°和45°的夹角,合金凝固时的领先相为β相。在100μm/s凝固速率下,合金界面以枝状形态生长,全片层组织方向与生长方向的夹角为90°,领先相从β相转化为α相。通过将合金中Cr和Nb元素的含量折算成Al的含量,计算Ti-48.3Al合金中α和β相界面生长温度,发现凝固速率达到180μm/s时,领先相可由β相转变为α相,理论计算结果支持实验中的相选择转变过程。
第4代聚酰胺-胺（polyamidoamine．PAMAM）树枝状聚合物与平均分子质量5 000的聚乙二醇（polyethylene glycol，PEG）通过酰胺键共价结合得PAMAM—PEG。分别以PAMAM和PAMAM—PEG为抗肿瘤药物甲氨喋呤（methotrexate，MTX）的纳米载体，制备了PAMAM／MTX和PAMAM—PEG／MTX复合物，考察复合物在大鼠体内药动学行为及对S180荷瘤小鼠的抗肿瘤作用。采用高效液相色谱法测定大鼠血浆样品中MTX浓度并计算药动学参数；S180荷瘤小鼠连续给药后第17天测定瘤重并计算肿瘤抑制率。结果显示，两种复合物的大鼠血浆半衰期（plasma half-life，t1/2）和平均滞…
以4A分子筛为阻燃协效剂,采用多聚磷酸蜜胺（MPP）和笼状季戊四醇磷酸酯（PEPA）复配阻燃剂,制备了具有良好阻燃性能的无卤阻燃PP。研究了4A分子筛用量对PP阻燃性能和协同作用的影响。结果表明：添加少量的4A分子筛即可显著提高PP的阻燃性能;当MPP/PEPA/4A分子筛添加量分别为12%、8%和2%时,阻燃PP的氧指数高达33。TGA、FTIR分析和体视显微镜及SEM观测结果表明：添加少量的4A分子筛可以催化MPP/PEPA间的酯化反应,促进体系成炭,形成更致密的炭层,从而提高材料的阻燃性能。
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合成了二维层状单缺位Keggin结构阴离子稀土衍生物Na3H8[La（PW11O39）2].19H2O,并用IR和X射线单晶衍射等手段对其进行了表征.该晶体属于单斜晶系,P2/n空间群,a=1.343 43（8）nm,b=1.259 35（7）nm,c=3.541 8（2）nm,β=99.151 0（10）°,V=5.915 9（6）nm3,Z=2,R1=0.042 9,wR2=0.119 4.化合物阴离子[La（PWO）]11-通过NaO桥联形成一维链,再通过NaO桥联形成二维层状结构.
Short bowel syndrome (SBS) patients is massive resection of the small intestine. The patients require total parenteral nutrition (TPN), medication, and surgical operation to different degrees, but these therapies have side effects. This study aims to crosslink gelatin with glutaraldehyde (GA) and1-(3-dimethylaminoprop…