Comparing potential-driven DBI-inspired non-minimal kinetic coupling(Dinkic) inflation with observational data

In our previous work [1], a new kind of inflation model was proposed, which has the interesting property that its perturbation equation of motion gets a correction of k4, due to the non-linearity of the kinetic term.Nonetheless, the scale-invariance of the power spectrum remains valid, both in large-k and small-k limits. In this paper, we investigate in detail the spectral index, the index running and the tensor/scalar ratio in this model, especially in the potential-driven case, and compare the results with the current PLANCK/BICEP observational data.We also discuss the tensor spectrum in this case, which is expected to be tested by future observations of primordial gravitational waves.     

铜-真空-铜金属隧道结转变电压的理论研究

利用非平衡格林函数与密度泛函理论相结合方法研究了电极表面具有原子级突起的铜-真空-铜隧道结的转变电压.计算结果表明,铜电极真空隧道结的转变电压主要决定于电极表面尖端铜原子4p轨道的局域态密度,因而对电极取向和表面局域原子构型非常敏感.对于电极取向沿(111)方向的铜电极真空隧道结,当电极表面原子级突起取为铜吸附原子和金字塔型铜纳米粒子两种构型时,转变电压的计算值分别约为1.40和2.40 V.当电极取向沿(100)方向时,电极表面原子级突起分别为铜吸附原子和金字塔型铜纳米粒子两种构型的铜电极真空隧道结,其转变电压的差异更为显著.具体而言,电极表面有一金字塔型铜纳米粒子的铜电极真空隧道结的转变电压值减小至1.70 V,而电极表面原子级突起为铜吸附原子的铜电极真空隧道结却因铜吸附原子4p轨道的局域态密度过于扩展,即使在偏压超过1.80 V时仍然没有出现转变电压.这些结果表明转变电压谱可用作分析金属电极真空隧道结电子输运特性的有力工具.     

船用复合材料螺旋桨研究进展

复合材料具有比强度高,阻尼性能好及可调整纤维铺层以控制结构变形等优点.复合材料应用于螺旋桨将改善螺旋桨的推进性能和振动特性.通过对国内外复合材料螺旋桨研究成果的回顾、总结和归纳,得出了传统的算法已不满足复合材料螺旋桨的设计和预报要求,复合材料螺旋桨的设计和预报算法需考虑桨叶变形引起的空间流场变化的结论.分析了可借助纤维增强材料所具有的弯扭耦合特性,调整桨叶纤维材料铺层和桨叶结构形式来提高螺旋桨推进效率的规律性.总结了复合材料螺旋桨研究中的关键技术和复合材料螺旋桨设计流程,并指出了复合材料螺旋桨未来研究的趋势.      

球型胶体颗粒的表面电位和表面电荷密度的关系

胶体颗粒的表面电荷密度和表面电位之间的关系是颗粒表面的基本性质之一．要确定这个关系,需要解Poisson-Boltzmann(PB)方程,求出颗粒外的电位分布．然而对于球形颗粒,PB方程却没有解析解．Loeb等,求出了数值解,近似解析表达式虽然很多,也比较复杂,     

万古霉素手性固定相的制备与对映体分离研究

采用双官能团试剂4,4′-二苯基甲烷二异氰酸酯在无水二甲基甲酰胺(DMF)中直接与大环糖肽类抗生素万古霉素及γ-氨丙基硅胶键合,得到环状抗生素手性固定相(CSP)并用于高效液相色谱手性分析。实验结果证实,合成的万古霉素CSP在正相和反相条件下均有一定的拆分能力,其中在反相条件下拆分了17种对映体,显示出其较为广泛的拆分范围,且磷酸缓冲体系略优于三乙胺-乙酸缓冲体系;对一些物质,如D,L-丹酰化氨基酸的拆分有一定的规律,能给出绝对构型信息。所制备的CSP在相体系转化时不发生老化和变性,显示了一定的稳定性。对该CSP的拆分机理进行分析所得到的结果与Armstrong等的分析结果基本一致。     

有机/聚合物顶发射发光器件*

有机/聚合物顶发射发光器件可以解决传统底发射发光器件的一系列不足。高性能顶发射发光器件的实现,首先必须优化器件结构,其次对电子注入材料和空穴注入材料提出更高的要求。本文从提高顶发射器件中电子注入和空穴注入方法入手,综述了国内外有机/聚合物顶发射电致发光器件的发展历史,研究现状,最新进展及以后的发展方向。     

一种用于多叶准直器适形放疗的剂量算法研究

描述了一种用于多叶准直器适形放疗的剂量计算方法。 在不同大小的方野和非规则野照射情况下, 将此方法得到的剂量分布与微分卷积法计算得到的剂量分布进行了精度验证。 结果表明, 这种算法具有较高的剂量精度和较快的计算速度, 因此可在适形放疗中用作MLC适形野的自动生成。 A dose calculation algorithm for MLC based conformal radiotherapy is described in this paper. The algorithm is formulated by the coordinate of MLC leaves. Verification on the algorithm is made by comparing the dose distributions generated by this algorithm with that generated by a Differential Convolution Superposition algorithm for various regular and irregular fields. The results demonstrate that the present algorithm has suitable accuracy and high computational efficiency, thus it could be useful for the treatment planning process in MLC based conformal radiotherapy, where the workload for interactively or automatically designing the shapes of MLC is heavy.     

用重离子实验数据推算质子翻转截面和轨道翻转率

空间单粒子辐射环境主要由重离子和高能质子构成,但在地面利用两种离子评估器件单粒子效应敏感度成本太高,因此利用重离子实验数据推算质子敏感参数成为一个非常活跃的研究课题.利用Barak经验公式,在重离子实验获得器件的σ LET值曲线的基础上,计算了几种典型器件在不同能量下的质子翻转截面以及典型轨道上质子引起的翻转率,并同FOM方法预示的质子翻转率进行了比较,其结果将对卫星电子系统抗辐射加固设计具有重要参考价值. The radiation environments concerned with single event upset mainly consist of heavy ions from cosmic ray and large flux proton from solar events and planetary radiation belts. The most reliable calculation for SEE rate induced by proton and henvy ions are the way to use the experimentally measured data rospectively. But it is too expensive to test devices with both heavy ions and protons. So it is necessary to derive models for predicting proton cross sections and rates from heavy ion test data....     

Field—ion microscopy observation of single—walled carbon nanotubes

Field-ion microscopy(FIM),a tool for surface analysis with atomic resolution,has been employed to observe the end structure of single-walled carbon nanotubes(SWCNTs).FIM images revealed the existence of open SWCNT ends,Amorphous carbon atoms were also observed to occur around SWCNTs and traditional field evaporation failed to remove them.Heat treatment was found to be efficacious in altering the end structures of SWCNT bundles.Carbon and oxygen atoms released from heated tungsten filament are believed to be responsible for the decoration imposed on the SWCNT ends.     

电化学方法制备Si阵列微孔的工艺研究

对用电化学方法制备Si大孔阵列管坑工艺进行了初步探索。 通过对Si在KOH溶液中各向异性湿法蚀刻和在HF酸溶液中的电化学蚀刻过程中各种参数的摸索, 确定在室温下制备大孔阵列的最佳配比浓度, 蚀刻出符合要求的管坑阵列, 为进一步制备结构化闪烁屏奠定了实验基础。 The 3 D structures in silicon are increasingly coming to use in many fields. For example, the high resolution X ray digital imaging detector can be made by coupling CCD and the scintillating screen which is made by the array trenches filled with CsI(Tl). In the present work, we explored the technology of etching micro array on the n type silicon with high resistance. By studying the relative parameters of anisotropic etching of KOH and electro chemical etching of HF, the optimized concentration of HF was determined and the micro pore array trenches with 200 μm in depth were realized. The results establish an experimental base for further fabrication of the scintillating screen.