Materials Literature
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Increasing environmental concerns about plastic waste in the community has led to the development of environmental friendly polymeric packaging materials. Polyethylene, one of the widely used packaging materials, can be made biodegradable by blending with biopolymers such as starch and/or pro-oxidants which are metal…
Boron, B, has many interesting electronic and structural properties, which makes it an ideal material for technical and industrial needs. The different binary materials that have been in focus in the present thesis, do all include B; metal diborides (MB2), cubic boron nitride (c-BN) forming an interface with diamond,…
In der Leistungselektronik spielt die Kenntnis des Wärmevrhaltens einer Platine eine sehr große Rolle. Die immer größeren Leistungsdichten unterstreichen die Wichtigkeit des Kenntnisses des Wärmeverhaltens. In der Platine funktionieren die Leistungskomponenten und Kupferlagen die große Ströme tragen als Leistungsquell…
The effects of groundwater and environmental variables on river ecology in terms of algal biomass (benthic and suspended) were determined across a watershed dominated by agricultural land-use (Raisin River, eastern Ontario). At the watershed scale, during summer base flows, light and temperature or Strahler stream ord…
Die Erwartungen der Automobilkunden an mehr Funktionalitaet und Effizienz der Fahrzeuge stellen die Werkstofftechnik vor neue Herausforderungen. Neue Systeme fuer effizientere Verbrennungsmotoren, elektrisches Fahren, Wasserstoffantrieb, Komfort und Sicherheit muessen in ein stimmiges und zuverlaessiges Gesamtkonzept…
Structures in the chip industry are approaching the 32 nm half pitch, which requires radiation in the VUV and EUV range. Cracking of hydrocarbon impurities in the vacuum by the radiation causes C growth on the VUV and EUV optics. Each nm of deposited carbon reduces the reflectivity of the optics by 1%. Fast removal of…
介绍了高线车间轧制Φ5.5mmER50-6焊丝钢时的控轧控冷工艺情况,以及所取的效果。着重介绍了ER50-6焊丝钢轧制过程中的终轧温度、吐丝温度和冷却速度对该品种钢的综合性能的影响,建立的控轧控冷工艺。
以二乙三胺五乙酸（DTPA）为络合剂,采用共沉淀法合成了单分散的NaYF4∶Yb,Er上转换荧光纳米颗粒。通过X射线衍射（XRD）、透射电子显微镜（TEM）、荧光（FL）光谱、热重-差示扫描量热分析（TG-DSC）对合成的样品进行了表征。所合成纳米颗粒的粒径均一,通过改变络合剂DTPA的用量可使颗粒的平均粒径在20～120nm范围内可调。纳米颗粒经煅烧后发生了由立方晶型向六方晶型的转变,并伴随着荧光强度的大幅提升。还探讨了络合剂DTPA的用量、煅烧温度对纳米颗粒粒径、晶型及荧光性能的影响。研究结果表明：络合剂DTPA的加入虽然在一定程度上阻碍纳米颗粒由立方晶型向六方晶型的转变,但可获得单分散的小粒径纳米颗粒,其荧光强度仍能满足生物…
The surface modification of lead zirconate titanate (PZT) ceramics with phosphate ester leaves a phosphorus residue absorbed onto the particle surface. During the sintering processes, this surface layer reacts with the PZT to form lead‐rich compounds, such as Pb3(PO4)2 and Pb4(P2O9). The formation of such a compounds…
Methodical problems of research with use ATR-FTIR spectroscopy of structural changes in water solutions of flotation reagents -buthyl xanmate and oleat. and also potassium chloride are discussed. Influence of a potassium chloride solutions preparation way on intensity of transmission is established.
This report presents the results of mineralogical characterisation of a small suite of seven pan concentrate samples from Nigeria. The samples were submitted for analysis by Drs Roger Key and John Ridgway (BGS) as part of the ‘Technical Assistance Services for the Geochemical Mapping of Nigeria’ project which aims to…
Bu calismada sutcu ineklerde meme basi derisi ve deliginde sekillenen lezyonlarin rastlanti oranlarinin ve cesitliliginin belirlenmesi, bu lezyonlarin sutun somatik hucre sayisina etkisinin arastirilmasi ve bu cercevede meme ve meme basinin anatomik yapisina iliskin verilerin dagilimlarinin ortaya konulmasi amaclandi.…
以离子液体为溶剂,天然竹纤维和高度剥离的大豆蛋白/蒙脱土(SPI/MMT)复合材料为原料,采用溶液共混的方法制备了纤维素/SPI/MMT 纳米复合材料.讨论了 SPI/MMT的加入对于 MMT 在纤维素基体中分散程度的影响.通过 XRD,SEM,TG,力学性能、阻隔性能测试等方法研究了纤维素/SPI/MMT 纳米复合材料的相容性,结构及 MMT 的加入对于纤维素性能的影响.实验结果表明,当 MMT 含量小于6wt%时,可以形成剥离或插层结构的纤维素/SPI/MMT 纳米复合材料,材料具有较好的力学性能,热稳定性和气体阻隔性能.
Dendritic poly(amidoamine)-b-poly(L-glutamate)(PAMAM-b-PLG) biohybrids were synthesized by the ring-opening polymerization ofγ-benzyl-L-glutamate N-carboxyanhydride monomer,followed by the deprotection of benzyl groups on poly(benzyl-L-glutamate),and were characterized by ~1H-NMR,FT-IR and gel permeation chromatograph…
A novel,facile method to prepare copolymers by virtue of the reinitiation of precursor containing isopropylthioxanthone(ITX) residues(ITXH) was reported.Using poly(maleic anhydride-co-vinyl acetate)(P(MAH-co-VAc)) with incorporated ITX residues as a macroinitiator,polymerization of styrene was performed,and poly(malei…
本文推导了一种可简便、准确、直观计算和分析pn结I-V特性的公式和方法，并应用该方法对两类典型HgCdTe环孔pn结的I-V、RD-V特性进行了计算和拟合；得到了表面欧姆（反型沟道）漏电导、二极管理想因子n随电压的分布等反映二极管结特性的重要参数。计算结果表明，对于长波HgCdTe光伏器件而言，表面漏电流在整个暗电流中所占的比重相当大，表面漏电流严重地制约着器件性能。HgCdTe材料的晶体缺陷会使二极管的理想因子n增大，从而使产生一复合电流及陷阱辅助隧穿电流增加。
Influence of plastic deformation carried out in austenitic state on properties of low-carbon HSLA steel with ferrite-bainite structure is studied. Independently on cooling conditions after plastic deformation and bainite amount, decreasing deformation temperature increases strength and impact toughness at negative tem…
As prepared SWNTs are obtained in bundles with a mixture of both metallic and semi conducting tubes. For many specific applications, electronically separated single individual tubes are required and in order to reach these application criteria, the tubes should be processed. This thesis reports on a systematic explora…
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2009.
采用真空粉末烧结法，制备了Al／Tb0．30Dy0.70Fe1．95复合材料，研究了该复合材料的物相、组织结构以及磁致伸缩性能，并对Al的加入量对复合材料的结构与性能的影响规律进行了探索。研究结果表明：烧结制备的Al／Tb0．30Dy0.70Fe1．95复合材料为多相结构，主要存在ReFe2、Al7ReFe5、Al2Re、Al3Re等相，随着Al的体积分数的增加，复合体中非GMM相渐渐增多，而GMM相则相应地减少，复合体内已不存在Al相；随着Al的体积分数的增加，复合材料的磁致伸缩系数λ起初略有上升，后明显下降，与纯GMM合金相比，Al／Tb0．30Dy0.70Fe1．95复合材料的磁致伸缩性能均较差，当Al的体积分数为20％时，…