Gluon-pair-creation production model of strong interaction vertices

By studying the \begin{document}$\eta_c$\end{document} exclusive decay to double glueballs, we introduce a model to phenomenologically mimic the gluon-pair-vacuum interaction vertices, namely the \begin{document}$0^{++}$\end{document} model. Based on this model, we study glueball production in pseudoscalar quarkonium decays, explicitly \begin{document}$\eta_c \to f_0(1500)\eta(1405)$\end{document}, \begin{document}$\eta_b\to f_0(1500)\eta(1405)$\end{document} , and \begin{document}$\eta_b\to f_0(1710)\eta(1405)$\end{document} processes. Among them \begin{document}$f_0(1500)$\end{document} and \begin{document}$f_0(1710)$\end{document} are well-known scalars possessing large glue components, while \begin{document}$\eta(1405)$\end{document} is a potential candidate for a pseudoscalar glueball. The preliminary calculation results indicate that these processes are marginally accessible in the presently running experiments BES III, BELLE II, and LHCb.     

Analytical expressions of non-relativistic static multipole polarizabilities for hydrogen-like ions

Analytical formulas for the static multipole polarizabilities of hydrogen-like ions are derived by using the analytical wave functions and the reduced Green function and by applying a numerical fitting procedure.Our results are then applied to the studies of blackbody radiation shifts to atomic energy levels at different temperatures.Our analytical results can be served as a benchmark for other theoretical methods.     

Calculation of the Temperature Dependence of the Unrelaxed Shear Modulus of High-Entropy Bulk Metallic Glasses from Calorimetric Data

JETP Letters - A method is proposed to calculate the temperature dependence of the unrelaxed shear modulus of high-entropy bulk metallic glasses from differential scanning calorimetry data. The...     

A dynamical transition of a chain of charged particles in a 2D substrate potential

The transport of a chain of charged particles with a transverse degree of freedom is investigated in a 2D asymmetric potential. Here, the energy of the periodic driving force is converted into motion in the vertical direction. The analysis exhibits a transition from stick-slip motion to periodic oscillation. The chain velocity can be controlled to an optimized value by adjusting system parameters, such as the amplitude and frequency of the periodic force. The existence of a resonance platform indicates resonance between the motion of the chain and the periodic force as coupling strength increases adiabatically. The atomic configuration and the transverse degree of freedom also play key roles in the control.     

Transport of nanodimers through chemical microchip

We propose a new microfluid chip for transporting micro and nano particles. The device consists of chemical stripe pathways full of fuel species, which can be realized in experiments by chemical surface reactions that form spatiotemporal patterns. A mesoscopic model is constructed to simulate the transport dynamics of nanodimers passing through the chip. It is found that the increases of the volume fraction and radius of the dimer both decrease the first reach time although the underlying mechanisms are different: the volume fraction affects the probability of touching and entering the chip while the radius determines the self-propulsion within the chip.The transport efficiency is influenced by the size of the particles.     

频率色散表面阻抗对真空电子太赫兹源的影响

为了研究欧姆损耗对高频真空电子器件工作特性的影响,首先推导频率色散表面阻抗边界在三维共形粒子模拟软件UNIPIC-3D中的实现原理,并通过对有耗边界矩形谐振腔和圆波导进行模拟验证了该阻抗边界算法的正确性.采用有耗共形UNIPIC-3D模拟相对论太赫兹表面波振荡器和低电压平板格栅返波振荡器.模拟结果表明,对于表面波振荡器和平板BWO这种电磁场集中在金属慢波结构附近的太赫兹真空电子器件,欧姆损耗会对器件的运行带来极大影响,对于采用铜材料的器件,输出功率会下降一半左右,器件起振时间出现延迟,但器件工作频率几乎不变.为了提高相对论太赫兹表面波振荡器的效率,在二极管和慢波结构之间增加了反射腔,模拟结果表明,在考虑器件表面损耗的条件下,器件的工作频率保持不变,输出功率由41 MW提高到60 MW.     

等离子体修饰TiO2及其响应光谱红移

TiO2在光催化方面应用前景十分广阔,而阻碍其应用的是它的宽禁带,因此研究开发响应光谱红移的TiO2就成为当前光催化剂研究的重要课题.等离子体处理是修饰TiO2的一种有效方法,目前等离子体修饰TiO2及其响应光谱红移的研究取得了一定进展,等离子体修饰的TiO2表面生成了氧空穴,并形成了原子掺杂,减小了禁带宽度,使其响应光谱红移.本文综述了目前该领域的研究现状,并对今后的研究做了展望.     

注射重量法制备乙醇气体标准物质的不确定度

分析了注射重量法制备乙醇气体标准物质不确定度的来源,包括乙醇称量过程引入的不确定度、氮气称量过程引入的不确定度、乙醇纯度引入的不确定度、氮气纯度引入的不确定度。合成不确定度及扩展不确定度分别为0.08%、0.16%(k=2)     

钙钛矿型甲醇水蒸气重整制氢催化材料的研究

采用溶胶凝胶法合成了钙钛矿复合氧化物,负载氧化铜后得钙钛矿负载型催化材料,通过XRD(X射线衍射分析)、BET(比表面积测试)、H2-TPR(程序升温还原分析)、XPS(X射线光电子能谱)等手段对催化材料进行了表征,考察了不同种类钙钛矿负载纳米铜催化材料的结构、性质对甲醇水蒸气重整制氢性能的影响.结果显示,钙钛矿负载纳...     

含5-氟尿嘧啶水凝胶的制备及体外透皮释放

制备了一种魔芋葡甘聚糖接枝丙烯酸水凝胶,并将其作为亲水药物5-氟尿嘧啶(5-FU)透皮释放制剂基材.考察了不同魔芋葡甘聚糖与丙烯酸摩尔比的凝胶在pH 7.4的溶胀率,结果表明凝胶的溶胀率随丙烯酸含量的增加而增大.采用浸泡吸附法得到含5-FU的载药凝胶,利用改进Franz扩散池进行了离体小鼠皮肤透皮释放实验,在魔芋葡甘聚糖和丙烯酸摩尔比为1∶60,载药量为3%时获得的最大累积释放量为4 721.2μg/cm2,渗透速率为(542.2±53.0)μg.cm-2.h-1.