Materials Literature
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This interim report presents progress towards the development of meso-scale models of magnetic behavior that incorporate microstructural information. Modeling magnetic signatures in irradiated materials with complex microstructures (such as structural steels) is a significant challenge. The complexity is addressed inc…
NMR spectroscopy has evolved into one of the most important characterization techniques in chemistry with which it is possible to obtain valuable structural, dynamical, and mechanistic information. Most applications of NMR have however been limited to the use of nuclei having spin quantum numbers of 1/2. This thesis d…
采用SEM和X射线能谱仪分析方法研究了50次热循环后Ba(OH)2·8H2O与铝合金和紫铜的相容性,发现Ba(OH)2·8H2O对铝合金有一定的腐蚀性,与紫铜具有优良的相容性.以简单的真空吸附填充方法制备了Ba(OH)2·8H2O/泡沫铜相变复合材料.搭建了含和未含泡沫铜相变储能装置实验台,对Ba(OH)2·8H2O/泡沫铜相变复合材料进行室温下稳态和瞬态的传热实验.结果表明:Ba(OH)2·8H2O/泡沫铜相变复合材料比纯Ba(OH)2·8H2O传热速率快,导热性能好,有效地降低了Ba(OH)2·8H2O的过冷度.高温恒温箱的传热实验表明:Ba(OH)2·8H2O/泡沫铜相变复合材料的蓄热能力随外界环境温度的升高而降低,当环境温…
应用丝网印刷和共烧结制备LaNi0.6Fe0.4O3-δ (LNF)/Sc0.1Zr0.9O1.95(ScSZ)/LaNi0.6Fe0.4O3-δ 对称电池.以硝酸铈和硝酸钆为原料、柠檬酸为燃料,采用燃烧法制备质量分数为21.3%的Gd0.2Ce0.8O2(GDC)包覆的LNF阴极.电化学阻抗谱(EIS)表明:在750 ℃工作温度下,当无Cr基合金接触时,质量分数21.3%的GDC包覆的LNF经过1 200 h的搁置,其极化电阻由0.13 Ω·cm2增加至0.40 Ω·cm2,而纯LNF经过500 h的搁置,极化电阻由0.70 Ω·cm2增加至2.36 Ω·cm2,GDC的包覆加速了气体/阴极/电解质三相界面反应区的扩散过程,降低…
With support from this program, we have generated key results in quantum dot (QD) formation, strain/electronic coupling, measurement and modeling of confined states, and examination of the influence of QDs on thermoelectric and photovoltaic properties of nanocomposite structures. This final report contains a descripti…
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This research studies the effect of harmonic filters on the low voltage (LV) distribution networks. With the high penetration of nonlinear loads and capacitor bank for power factor correction, the total harmonic distortion (THD) is increasaed and aggravated to be beyond the allowable limit. The higher THD pollutes the…
Time-dependent close-coupling methods are used to study the single and double photoionization of Li2. Formulations for both one-active and two-active electron methods make use of Hartree with local exchange potentials for the core electrons. Both the single and double photoionization cross sections for Li2 are found t…
Ce mémoire évalue numériquement l’influence des gouttes d’éthanol sur la propagation d’une flamme laminaire prémélangée. \n \nUn modèle numérique simplifié, ciblé sur l’étude de la propagation libre de flammes prémélangées et monodimensionnelles dans des milieux diphasiques à 300 K, a été développé sous le logiciel CO…
We propose equations governing the dissolution in inhomogeneous temperature field in terms of the variational principle. The derived equations clarify that the interface energy between solute and solvent has a significant effect on the process of the dissolution. The interface energy restrains the dissolution, and the…
Li-ion batteries have a predominant market share as mobile energy storage devices, especially in consumer electronics. New concepts for electrode material designs are, however, necessary to boost their energy and power densities, and most importantly, the long term cycle stability. This will allow for these devices to…
In der Bundesrepublik Deutschland werden etwa 25 % der Rinder und 10 % der Schweine in eingestreuten Stallsystemen gehalten. Daraus resultiert ein jährlicher Festmistanfall von etwa 32 Mio. t. Ausgenommen bei Tiefstreu-Stallungen fällt dieser Mist kontinuierlich an und wird üblicherweise auf einer befestigten Dungplat…
以丙烯酸异辛酯（2-EHA）、乙酸乙烯酯（VAC）为单体,过氧化苯甲酰（BPO）为引发剂,通过向甲苯溶剂中滴加混合单体合成了聚合物非硅抗泡剂.单因素考察实验表明,当n（2-EHA）∶n（VAC） =0.52∶0.48,引发剂质量为单体质量的0.2％,反应温度为80℃,反应时间为6h时,合成共聚物抗泡剂对润滑油抗泡效果最好.凝胶渗透色谱法（GPC）测定共聚物相对分子质量发现,数均相对分子质量在4.5 ＆#215;l04 ～6.0＆#215;104之间时,抗泡剂的性能最好.抗泡剂的抗泡性能对比实验结果表明,合成的非硅抗泡剂比氟改性聚硅氧烷和硅油抗泡剂有更好的抗泡稳定性.
将纳米TiO2与低密度聚乙烯(LDPE)复合形成包膜液,采用喷动流化床包膜设备制备了纳米TiO2-LDPE复合材料包膜控释肥.在水浸泡法研究控释肥养分释放特征的基础上,对人工加速老化条件下光照不同时间的控释肥残膜进行失重率测定.采用FT-IR、DSC和黏度法等分析了纳米TiO2对控释肥残膜光催化降解特性的影响,探讨了残膜在光照前后的分子量和羰基指数等的变化规律.结果表明:光催化剂加入后,控释肥的养分释放速率降低且释放期变长;疏水纳米TiO2对控释肥残膜的降解具有显著的促进作用,当添加的质量分数为1%时,降解性能最好.随着残膜的降解程度增大,残膜中LDPE的羰基指数和结晶度升高,黏均分子量下降.
We developed a method to measure the phase retardation and birefringence of muscovite mica plate in the temperature range of 223K to 358K within the spectrum of 300 to 700 nm. The phase retardation data is gained through the standard transmission ellipsometry using spectroscopic ellipsometer. With the phase retardatio…
Tissue engineered organs and implants hold promise for the replacement of damaged and diseased organs. However, the foreign body response (FBR) is a major obstacle that compromises the function of tissue engineered constructs, typically causing them to fail. Two components of the FBR are the inflammatory response and…
Figure 12: Distribution of ∆V . (a) Plasma potential as a function of z for the initial state (green) and the mean of the plasma potential during 0.1 s starting when the respective target voltages were first reached. The left vertical dashed lined is located at z = 4.94 × 10m where the initial plasma potential was 150…
Mit einer neuartigen Reinigungstechnologie kann ein Nebenprodukt aus der Naturfaseraufbereitung, das Schäben-Faser-Gemisch, effektiv aufbereitet werden. Außer zurückgewonnenen Kurzfasern können gereinigte Schäben in hochwertiger Qualität der Industrie zur Verfügung gestellt werden. Die Wirtschaftlichkeit von Faseraufs…
Nous etudions numeriquement la solidification directionnelle d'un alliage binaire a base de succinonitrile. Pour cela, nous developpons un code s'appuyant sur le formalisme du champ de phase adapte au cas de la croissance dans des lames minces. Les resultats numeriques obtenus sont compares qualitativement et quantita…
Se ha realizado un estudio del mecanismo de la reaccion de intercambio del ligando axial por fenoles en SubPcs que ha permitido la determinacion experimental de la ley de velocidad del proceso. Los datos experimentales apuntan a una ecuacion de velocidad de segundo orden dependiente de las concentraciones de la SubPc…