Materials Literature
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To explore the feasibility of mesenchymal stem cells(MSCs)acting as seed cells in tissue engineering,we isolated human bone marrow MSCs and differentiated them into vascular endothelial-like cells(ELCs)in vitro.Bone marrow mononuclear cells(BMSCs)were isolated by the method of percoll density centrifugation,and seeded…
Using 99.99% pure argon as sputtering gas,MgZnO films with wurtzite structure were prepared on quartz substrate by radio frequency magnetron sputtering technique with MgZnO targets of different Mg content and then annealed under 10-4 Pa in a tube furnace.Effects of Mg content on the optical properties of these films w…
Polyvinyl alcohol /chitosan /nano-hydroxyapatite( PVA /CS /n-HA) hydrogel was prepared via the chem-physical method. Effects of PVA content and the mass fraction of glutaraldehyde( GA) on the performance of the composite material were studied by testing its moisture content,tensile strength,infrared spectroscopy and T…
A new metal-organic hybrid compound(1) with stuctural phase transition above room temprature has been synthesized. Differential scanning calorimetry(DSC) measurement shows a pair of reversible thermodynamics peaks at 320.5 K(cooling) and 339.5 K(heating) with a large heat hysteresis about 19 K, indicating the compound…
N-doped TiO2（N-TiO2） nanoparticles were synthesized via a one-step low temperature（180 C）solvothermal route,which adopted NH4NO3 as the nitrogen source.The structure,composition,BET specific surface area,and optical properties of the as-synthesized product were characterized by X-ray diffraction,transmission electron…
A complex mathematical model that describes the action on the human body of uranium hexaflu oride that enters the air of the work space in facilities of the atomic industry is considered. Partial models that describe the pollution of the work space and percutaneous and inhalation entries of toxic substances to the bod…
A differential/integral method to estimate the kinetic parameters(apparent activation energy Eaand pre-exponential factor A) for thermal decomposition reaction of energetic materials based on Kooij formula are applied to study the nonisothermal decomposition reaction kinetics of hexanitrohexaazaisowurtzitane(HNIW) by…
A new blue phosphorescent iridium( Ⅲ) complex based on 2',6'-difluoro-2,3'-bipyridine and 3-Acetyl-camphor,( dfpypy)2Ir( acam) was synthesized. The complex emits bright blue phosphorescence with λmaxat 466 nm accompanied a weakly shoulder peak at 487 nm and has the full-width at half maximum( FWHM) of 55 nm. The photo…
目的将学习 Swertia cincta 的化学成分。方法准备液体层析被采用。混合物的结构被分光镜的分析阐明。结果三 secoiridoid glycosides 从 S 被孤立。cincta 并且是识别了 8-methoxyl-eustomorusside (1 ) ， secoiridoids eustomorusside (2 ) ，和 eustomoside (3 ) 。结论化合物 1 是新 secoiridoid glycoside。混合物 2 和 3 第一次从这植物被孤立。
多围的碳 nanotube (MWCNT ) 表从一个可绘制的 MWCNT 森林被制作然后扔了在上(甲基 methacrylate ) poly 拍摄。这部电影与自然抗菌剂肽 nisin 是进一步涂的。我们从依附的孢子在杆菌 anthracis 孢子，依附的孢子的萌芽，和随后的 biofilm 形成的附件上学习了 nisin 涂层的效果。强壮的 adsorptivity 和 MWCNT 的超级 hydrophobicity 为 nisin 涂层提供了一个理想的平台，这被发现。MWCNT 表上的 Nisin 涂层减少了表面 hydrophobicity，减少的孢子附件，并且由 3.5 褶层减少了依附的孢子的萌芽，并且进一步在 unc…
The change of compressive strength and the bonding strength to spheroidal graphite cast iron of the slag cement mortar lining, as well as the change of its morphology before and after spray corrosion test with 10%Na2SO4salt were investigated by means of compressive and tensile tests, and XRD, XRF and SEM respectively.…
以苯乙烯为起始物,经催化环氧化然后环氧化物与二氧化碳环加成反应“串联一锅”制备苯乙烯环状碳酸酯,反应工艺简单（避免了中间体环氧化物的事先合成与分离）且绿色经济（原料苯乙烯比苯乙烯环氧化物价格低廉且毒性小）,工艺具有潜在的工业应用前景.探讨了掺杂不同金属（Co,Fe,Ni,Mn,Cu,Ti）的MCM-41介孔分子筛催化剂对苯乙烯环氧化的转化率和选择性,研究表明以含钴介孔分子筛Co-MCM-41为最佳,并以Co-MCM-41耦合溴化四丁基铵（TBAB）为催化剂,考察了苯乙烯直接氧化碳酰化制苯乙烯环状碳酸酯反应.从影响反应活性和产物选择性的因素来优化反应,在80℃、4 MPa、CO2压力下,反应7h,碳酸酯的收率达到46.1％.Co-M…
In this paper, the conduction band-edge non-parabolicity(NP) and the circular cross-section radius effects on hydrogenic shallow-donor impurity ground-state binding energy in zinc-blende(ZB) InGaN/GaN cylindrical QWWs are reported. The finite potential barrier between(In,Ga)N well and GaN environment is considered. Tw…
In order to meet the special requirements for filter coating of the space optical communication system,a narrow-band filter with high rejection in near-infrared band was prepared.The filter can reduce the interference of the stray light perfectly in the range of deep background.Through analyzing the characteristics of…
The corrosion behavior of TP140 steel was investigated based on the corrosion tests in such severe conditions as the live acid solution(15% HCl + 1.5% HF + 3% HAc + 5.1% inhibitor),spent acid and formation water containing CO2 corrosion with high pressure and high temperature.Also the electrochemical analysis was used…
Considering energy shortage, large molecules in corn cob and easy separation of solid catalysts, nano oxides are used to transform corn cob into useful chemicals. Because of the microcrystals, nano oxides offer enough accessible sites for cellulose, hemicellulose and monosaccharide from corn cob hydrolysis and oxidant…
Hydrogen plays an important role in the formation of quench cracks of structural steels.To clarify hydrogen absorption and desorption during heat treatment of AISI 4140 steel,thermal desorption spectrometry(TDS)analysis was carried out for the specimens in the as-rolled,as-quenched,and quenched and tempered conditions…
It is suggested that nuclear power plant cooling water contaminated with radioactive cesium and strontium isotopes should be purified not up to maximum permissible concentrations, which are a hundred or more times higher than natural background radiation levels, but until concentrations that are in line with such natu…
For contamination of the 6~10 kV medium voltage insulators XP-7 strain insulator-string, the analysis is made to the localized pollution flashover accident in Chongqing in recent years with a surface of insulator contamination degree of relationship. Through the surface of porcelain insulator pollution layer conductiv…
鉴于环境、经济的方面，沥青与包装废物再循环被修改花费的聚苯乙烯(WEPS ) 而不是普通聚合物。微分扫描热量测定(DSC ) ，旋转粘度计并且动态砍流变学(数据设置就绪) 被用来分析并且评估修改沥青的粘弹性。当沥青的车辙抵抗被增加时，结果显示到温度的修改沥青的敏感被减少。另外，沥青的粘弹性与 WEPS 在修正以后被改进。而且，修改沥青在高温度在低温度和低粘性有高粘性，它为建设是有利的。