Nucleonic ~1S_0 Superfluidity Induced by a Soft Pion in Neutron Star Matter with Antikaon Condensations

The nucleonic ~1S_0 superfluidity is investigated by solving the gap equation for the Reid soft-core potential as the nucleon-nucleon interaction in neutron star(NS) matter which is considered to be made up of p, e, μ and condensed antikaon matter. We mainly study the influence of the soft pion-induced potential on the nucleonic~1S_0 pairing gaps in the above NS matter. It is found that the intensities of the nucleonic ~1S_0 pairing gaps including the soft pion-induced potential are smaller than those calculated in the case of not including the soft pion-induced potential. Furthermore, the nucleonic ~1S_0 pairing gaps with the soft pion-induced potential fall into decline with the deepening of the optical potential of antikaons in the above NS matter, whereas they increase with the parameter η for the fixed optical potential of antikaons. Due to the appearance of the soft pion-induced potential, the maximum values of nucleonic ~1S_0 pairing gaps at parameter η = 0.20,0.55 are suppressed by1.7%-6.8% with respect to the case without soft pion-induced potential in the above NS matter.     

纤维增强复合材料层合球壳的应力分析

1. 引言本文对受内压的复合材料球壳应用经典层合理论进行应力应变的分析。由一般球形壳体理论的五个平衡方程、六个几何方程及由层合理论导出的六个物理方程,共有十七个独立的方程可求解十七个未知函数,它们是三个中面位移、三个中面应变、三个曲面的曲率变化、五个应力合力、三个合力矩。应用球形壳体的应力函数U以后,得到二个基本微分方程。如为对称铺设此二基本微分方程可以简化。本文用有限差分法解此二基本微分方程。2. 基本方程的推导球壳的平衡方程如下:     

极坐标有限条法解扁球壳问题

本文用有限条法解扁球壳问题,对于轴对称问题与位移和内力沿环向按cosnθ或sinnθ分布的非轴对称问题,分别推导了三类壳元(圆底壳元,圆孔外无限壳元,圆环底壳元)刚度矩阵的精确解。对于沿环向按cosnθ或sinnθ分布的环形面荷载和环形线荷载推导了单元等价节线荷载的表达式。编制了相应的计算程序,计算了典型例题。结果表明,此法具有计算工作量少而计算精度高的优点。     

2,3-二苯基丙烯酸酯在DTBP/CaCl_2作用下的氧化偶联

多甲氧基菲-9-甲酸及酯是合成娃儿藤生物碱及其类似物的关键中间体。实验发现,以DTBP作为氧化剂,CaCl2存在下,能有效提高分子内氧化偶联合成多甲氧基菲-9-甲酸及酯产率,且反应条件温和,后处理方便,为合成许多重要化合物前体菲提供了一种新的思路。     

A NUMERICAL AND ANALYTICAL STUDY ON A TAIL-FLAPPING MODEL FOR FISH FAST C-START＊

The force production physics and the flow control mechanism of fish fast C-start are studied numerically and theoretically by using a tail-flapping model. The problem is simplified to a 2-D foil that rotates rapidly to and fro on one side about its fixed leading edge in water medium. The study involves the simulation of the flow by solving the two-dimensional unsteady incompressible Navier-Stokes equations and employing a theoretical analytic modeling approach. Firstly, reasonable thrust magnitude and its time history are obtained and checked by fitting predicted results coming from these two approaches. Next, the flow fields and vortex structures are given, and the propulsive mechanism is interpreted. The results show that the induction of vortex distributions near the trailing edge of the tail are important in the time-averaged thrust generation, though the added inertial effect plays an important role in producing an instant large thrust especially in the first stage. Furthermore, dynamic and energetic effects of some kinematic controlling factors are discussed. For enhancing the time-averaged thrust but keeping a favorable ratio of it to time-averaged input power within the limitations of muscle ability, it is recommended to have a larger deflection amplitude in a limited time interval and with no time delay between the to-and-fro strokes. The project supported by the CAS (KJCX-SW-L04)     

3度图的最小顶点覆盖问题的多项式时间算法

最小顶点覆盖问题是图论和组合数学中经典的NP-Hard问题之一,在实际问题中有着广泛的应用.本文首先给出最小顶点覆盖问题的若干性质,然后根据这些性质设计了3度图最小顶点覆盖问题的一个多项式时间算法,并通过2个实例对算法进行了说明.     

A 4×4 metal-semiconductor-metal rectangular deep-ultraviolet detector array of Ga2O3 photoconductor with high photo response

A 4$\times $4 beta-phase gallium oxide ($\beta $-Ga$_{2}$O$_{3}$) deep-ultraviolet (DUV) rectangular 10-fingers interdigital metal-semiconductor-metal (MSM) photodetector array of high photo responsivity is introduced. The Ga$_{2}$O$_{3}$ thin film is prepared through the metalorganic chemical vapor deposition technique, then used to construct the photodetector array via photolithography, lift-off, and ion beam sputtering methods. The one photodetector cell shows dark current of 1.94 pA, photo-to-dark current ratio of 6$\times $10$^{7}$, photo responsivity of 634.15 A$\cdot$W$^{-1}$, specific detectivity of 5.93$\times $10$^{11}$ cm$\cdot$Hz$^{1/2}\cdot$W$^{-1}$ (Jones), external quantum efficiency of 310000%, and linear dynamic region of 108.94 dB, indicating high performances for DUV photo detection. Furthermore, the 16-cell photodetector array displays uniform performances with decent deviation of 19.6% for photo responsivity.     

含膦酰杂菲侧基的4-炔基苯甲酸酯对聚叠氮缩水甘油醚点击接枝反应及其聚集诱导发光增强性能

在CuI催化作用下,实现了含膦酰杂菲侧基的4-炔基苯甲酸酯(MAT4)与聚叠氮缩水甘油醚(GAP)的点击接枝反应,得到新型接枝聚合物G-M4,并由红外谱图确定了等摩尔反应.由于分子内含膦酰杂菲基团侧基之间较强的π-π和极性共同相互作用以及聚醚主链的柔顺性,使G-M4分子链内侧基之间相对空间位置比较固定,分子链构型规整,...