Materials Literature
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为充分了解2205双相不锈钢在CO2-H2S·Cl--H2O环境下的耐蚀性能，尤其是其抗点蚀特性，借助计时电流和动电位循环极化测试等手段研究了其钝化动力学特征以及腐蚀特征参数如Ecorr,Epit、Epp、△E和Jpass的变化，分析了2205双相不锈钢在含CO2和CO2／H2S的NaCl溶液中的点蚀差异，并对其点蚀和钝化机理进行了讨论。结果表明，2205双相不锈钢具有优越的抗CO1腐蚀性能，随Cl-浓度增大，发生点腐蚀敏感性提高；随H2S浓度增大，点蚀电位Epit和保护电位Epp均降低，钝化区域稳定性下降，点蚀敏感性进一步提高。
通过水热法合成出NaY（WO4）2∶Sm^3＋上转换荧光粉。该荧光粉性质通过扫描电子显微镜、X射线粉末衍射、激发光谱以及发射光谱来表征。探讨了Sm^3＋浓度及退火温度对NaY（WO4）2∶Sm^3＋晶体结构、形貌和发光性能的影响。在Sm^3＋浓度为1.2%,800℃退火条件下合成的样品具有最佳发光性能。利用816nm光激发NaY（WO4）2∶Sm^3＋,观察到了563nm处绿光,606nm处橙光以及647nm处的红光发射峰。它们分别来自于Sm^3＋的^4 G（5/2）→^6 H（5/2）、^4 G（5/2）→^6 H（7/2）、^ G（5/2）→^6 H（9/2）能级跃迁。
Plasmonic nanostructures have been shown to act as optical antennas that enhance optical devices due to their ability to focus light below the diffraction limit of light and enhance the intensity of the incident light. This study focuses on computational electromagnetic (CEM) analysis of two devices: 1) GaAs photodete…
Rheological methods for the solution of technical tasks were developed in metallurgy, in the production of polymers, construction and other materials as far as in the middle of the last century. The methods are based on dependences between stresses and strains or the deformation rates in the processes of loading the m…
Het is ondertussen bijna 7 jaar geleden dat ik de kans kreeg om te beginnen werken aan dit doctoraat waarvan deze thesis het resultaat is.Na mijn masterproef in toegepaste wiskunde leek het mij een heerlijke uitdaging om van start te gaan binnen de onderzoeksgroep Numerical Analysis and Mathematical Modeling van de va…
The reinforcement corrosion is one of the major problems with relevant economic impact in the life cycle of concrete structures and that is why it is necessary to optimize the repair strategies in corroded structures. However, almost no international codes are available for structural evaluation and some criteria will…
采用溶胶-凝胶法在锰酸锂（LiMn2O4）正极材料表面包覆一层[Li,La]TiO3（LLTO）,通过XRD、SEM、EDS等对LLTO包覆LiMn2O4材料的晶体结构、形貌及组成元素进行表征分析,并对其电化学性能进行了研究。结果表明：改性后的尖晶石LiMn2O4无杂相出现,循环性能稳定;在1C电流倍率条件下循环200次后,1.5%LLTO包覆的LiMn2O4材料在所有改性样品中循环性能最佳,其比容量为106.1mAh/g,高于空白LiMn2O4的92.7mAh/g,容量保持率高达90.8%,高于空白LiMn2O4的74.1%。
We use high performance computing and self consistent field theory to investigate the morphology of multi-block polymers under different geometric confinement. Understanding the morphology adopted by polymers allows the design of tailored structures for industrial applications including organic electronics, micro-cata…
采用单辊快速凝固法制备了Ag-Cu-Ge钎料薄带。利用差示扫描量热仪（DSC）、X射线衍射仪（XRD）分析钎料合金的熔化特性和相组成。用扫描电子显微镜（SEM）观察钎料合金和钎焊接头的显微组织,并用能谱仪（EDS）进行微区成分分析。结果表明：快速凝固Ag-Cu-Ge钎料合金液相线降低了4.8℃,熔化区间减小了4.4℃;普通凝固钎料合金组织粗大,偏析严重,快速凝固钎料合金组织显著细化,成分更加均匀;与普通凝固钎料相比,快速凝固Ag-Cu-Ge钎料在铜和镍基体上的润湿性和铺展性更好,过渡层的厚度更宽,钎焊接头剪切强度更高;钎料合金与铜基体形成层状固液同分化合物,而与镍基体形成了笋状固液异分化合物,这种嵌入式结构有利于提高钎焊接头的牢固…
By studying on the little cotton textures from relics excavation, there is not a clear answer to when the China cotton planting started. Although Qiru area was the north weaving center, there were not so much unearthed fabrics. “The lion rolling ball” parcel cloth of Qing Dynasty is one of the seldom printed cottons.…
采用溶胶–凝胶法在玻璃基底上制备镉掺杂氧化锌（Zn1–xCdxO）薄膜。利用X射线衍射仪、场发射扫描电子显微镜、紫外–可见分光光度计研究了镉掺杂量、预处理温度对薄膜结构及其光学性能的影响。结果表明：当预处理温度为150℃,且x〈0.3时,Zn1–xCdxO薄膜为六角纤锌矿结构;当x≥0.3时,Zn1–xCdxO薄膜出现立方岩盐矿结构。制备的薄膜表面的晶粒分布均匀且致密,平均晶粒尺寸随掺杂量的增加先减小后增大。Zn1–xCdxO薄膜在可见光范围内透过率均高于80%;随着镉掺杂量增大,薄膜的吸收边红移,其禁带宽度逐渐由3.3 e V（x=0）减小至2.2 e V（x=1.0）。
The development of effective and environmentally acceptable protective coatings for the conservation of bronze artworks is still an unresolved issue. In recent years, silane coatings aroused great attention because some of them showed a good protection against bronze corrosion under conditions simulating outdoor expos…
4 zip files are in the dataset. \n1) the Cr K-edge EXAFS data and analysis \n2) the XANES simulations using FEFF2 \n3) the DFT results from Spartan '14 using the EDF2 functional \n4) the DFT results from Spartan '14 using the omegaBD77X-D functional \n \nData supports by Bartlett, Stuart A et al (2016) Activation of […
Electrical treeing determines lifetime of solid insulating media in power equipment. A non-destructive observation method in non-transparent sample is needed to evaluate propagation of electrical trees. In this paper, we report observation results of electrical trees in unfilled and filled epoxy by X-ray phase contras…
利用磁控溅射方法改变衬底温度,制备了一系列NiO：Cu/ZnO异质pn结。实验结果表明,当衬底温度从室温升高到300℃时,NiO：Cu/ZnO异质pn结的整流特性明显得到改善;与此同时,NiO：Cu/ZnO异质pn结的光学透过率也从40%增大到80%。这可能是由于NiO：Cu薄膜结晶质量改善,薄膜内缺陷减少所致。继续增加衬底温度至400℃,异质结的整流特性有所削弱,这可能是由于生长在异质结下层的NiO：Cu薄膜影响了其上ZnO薄膜的生长,进而影响到异质结的整流特性。这一结论,得到X射线衍射（XRD）、原子力显微镜（AFM）和紫外（UV）谱测试结果的支持。
The aim of this work is to determine displacement and deformation during hot tube billet extrusion with various die shapes. Calculations were performed for extrusion of titanium VT6 alloy at 1000 °C. Computational experiments involved the use of the finite element method realized in the QFORM software complex. The sol…
be described as rocky, low in pH and nutrients and oligotrophic, yet it is unusual in that, although it has an area of 381 597 m2 (Jehu 1902), the maximum depth is only 4 m and the mean depth 2 1 m. The length east to west is 1554 m and the maximum breadth 379 m. Growing in the diatomaceous sediment that covers most o…
Diaminopyridoisoquinolinedione, compound 3 published in:"Janus molecules: Synthesis of double-headed heterocycles containing two identical hydrogen bonding arrays" Andrew Marsh, Ernest G. Nolen, Kevin M. Gardinier, Jean-Marie Lehn Tetrahedron Letters 1994, 35, 397-400. 3,7-bis((4-dodecylphenyl)amino)pyrido[4,3-g]isoqu…
定量研究了大挤压比（81：1）条件下Mg-6xZn-xY合金的微观组织和力学性能。结果表明：随着Zn、Y含量的增加,准晶相含量逐渐增加,α-Mg基体平均晶粒尺寸先减小后增大,Mg-6Zn-1Y合金中的α-Mg平均晶粒尺寸最小为2.9μm,且尺寸分布最均匀,其标准差也达到最小,为0.77μm。随着Zn、Y含量的增加,Mg-Zn-Y合金的屈服强度和抗拉强度逐渐增大,延伸率逐渐降低。相比于α-Mg基体晶粒细化,细小准晶相含量的增加对提高Mg-6xZn-xY合金强度的作用更明显。
Temperature effects on electrical and optical properties of a representative semiconducting polymer, poly[2-methoxy-5-(2’-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV), has recently attracted much attention. The MEH-PPV thin films were deposited at different drying temperature (anneal temperature) using spin-coati…