应力敏感气藏产能方程研究

针对应力敏感气藏开发存在变渗透率的问题,定义了新的考虑应力敏感的拟压力,并从气体多孔介质渗流力学理论出发,建立了考虑应力敏感影响的气藏二项式产能方程,讨论了该方程参数     

Improving nucleation in the fabrication of high-quality 3D macro-porous copper film through the surface-modification of a polystyrene colloid-assembled template

A new approach is developed to the fabrication of high-quality three-dimensional macro-porous copper films. A highly-ordered macroporous copper film is successfully produced on a polystyrene sphere (PS) template that has been modified by sodium dodecyl sulfate (SDS). It is shown that this procedure can change a hydrophobic surface of PS template into a hydrophilic surface. The present study is devoted to the influence of the electrolyte solution transport on the nucleation process. It is demonstrated that the permeability of the electrolyte solution in the nanochannels of the PS template plays an important role in the chemical electrodeposition of high-quality macroporous copper film. The permeability is drastically enhanced in our experiment through the surface modification of the PS templates. The method could be used to homogeneously produce a large number of nucleations on a substrate, which is a key factor for the fabrication of the high-quality macroporous copper film.     

Fast preparation and thermal transport property of TiCoSb-based half-Heusler compounds

TiCoSb-based half-Heusler compounds with the substitution of Zr for Ti have been prepared quickly by combining high-energy ball milling method with spark plasma sintering technique, and their thermal transport properties have been investigated. With the increase of the concentration of Zr, the thermal conductivity of Til-xZrxCoSb compounds decreases significantly. Compared with the thermal conductivity of TiCoSb compound, that of Ti0.5Zr0.5CoSb decreases by 200% at 1000 K.[第一段]     

Brönsted酸性离子液体催化酯化反应研究

合成了以2-吡咯烷酮和N-甲基咪唑为阳离子([Hnhp]＋和[Hmim]＋), , 和 为阴离子的一系列Brönsted酸性离子液体. 考察了这些离子液体的热稳定性和酸性. 以乙酸和异戊醇酯化合成乙酸异戊酯的反应考察了不同离子液体分别在不分水与分水条件下的催化效果, 结果表明, 不分水时, 当醇/酸/[Hnhp]HSO4物质的量比为1.2∶1∶0.2, 100 ℃下回流反应2 h, 酯收率可达93.6%, 反应结束后[Hnhp]HSO4体系可以顺利分相, [Hnhp]BF4则不能; 分水时, [Hnhp]BF4可与酯自动分相, 当醇/酸/[Hnhp]BF4物质的量比为1.2∶1∶0.01, 120 ℃下回流反应1.5 h时, 酯收率可达96.8%, 比相同条件下[Hnhp]HSO4的略高. 这两种体系中的离子液体均具有良好的重复使用性能. 实验中还探讨了不同离子液体的酸性和催化酯化反应后与酯产物的分相效果对其催化活性的影响, 结果表明, 离子液体的酸性和与酯的不可混溶性对其在不同体系中酯化反应的催化活性有不同程度的影响. 此外, 在上述不分水酯化条件(醇∶酸∶催化剂物质的量比均为1.2∶1∶0.2, 100 ℃油浴)下回流浸渍6 h比较离子液体[Hnhp]HSO4/BF4, [Hmim]HSO4/BF4和硫酸对奥氏体316不锈钢的腐蚀性, 测得离子液体腐蚀率比硫酸低; 除了[Hnhp]BF4, 离子液体[Hnhp]HSO4, [Hmim]HSO4和[Hmim]BF4的腐蚀性呈现随酸性递减而下降的趋势. 所测离子液体中[Hnhp]BF4腐蚀性最高. [Hnhp]BF4和硫酸中试样的腐蚀率分别为20.1和41.8 g/(m2•h).     

枝状聚硅烷光学及其稳定性

聚硅烷;光学性能;光热稳定性;热降解动力学     

Se(Ⅳ)与藻蓝蛋白相互作用的谱学研究

用吸收、荧光、红外等谱学方法研究了藻蓝蛋白（PC）与Se（Ⅳ）的相互作用．结果表明,SeO3^2-加入后,藻蓝蛋白在620nm处的特征光吸收减弱,并随Se（Ⅳ）浓度和时间的增加而降低,而278和347nm处的光吸收增强;荧光发射和荧光激发也逐渐减弱,而599和629nm处的2个激发峰的相对强度与对照相反．PC在475和662nm处分别出现共振散射峰．Se（Ⅳ）与PC的作用后,在595nm处出现强的共振散射峰,被指认为液相纳米硒粒子与PC生成的缀合物的共振散射峰．红外光谱图中,PC的酰胺Ⅰ带为1653．2cm^-1,为α螺旋,而PC—Se（0）生物缀合物的酰胺Ⅰ带为1647．0cm^-1,属无规则卷曲。     

与材料中的微裂纹有关的内耗和模量亏损

在微裂纹上下表面摩擦而产生能量损耗的假设下,计算出了与材料中的微裂纹有关的内耗和模量亏损的表达式.在低频和小裂纹近似下,内耗正比于裂纹线度的3次方,而模量亏损正比于裂纹线度的2次方,且它们都正比于裂纹的密度.根据这种定量关系,有可能用内耗和超声衰减及动态弹性模量测量来无损探测微裂纹的线度和密度.     

混合遗传算法在CDMA移动通信多用户检测中的应用研究

研究了将混合遗传算法应用于直接序列码分多址扩频通信的多用户检测 ,先给出了在异步高斯信道下解调扩频信号的结构框图 ,然后分析了用混合遗传算法进行多用户检测的理论依据和实际性能。仿真结果表明无论是抗多址干扰还是抑制远近效应 ,基于混合遗传算法的检测器都明显优于传统检测器 ,且其性能非常接近最佳检测器。     

偏苯三酸酐-环氧丙烷丁基醚合成超支化碱溶性聚酯

通过1,2,4-偏苯三甲酸酐(TA)和环氧丙烷丁基醚(BGE)合成超支化碱溶性聚酯,利用合成聚合物分子外围的羧基与烯丙基缩水甘油醚(AGE)反应,在超支化聚合物分子外围引入反应性烯丙基醚.研究了树脂组成对感光性和碱溶性的影响;结果表明:调整反应物料配比,可以获得较好的碱溶性和光固化性能,其树脂的反差γ可达到3.92.     

Torsional impact response of a penny-shaped crack in a functional graded strip

The torsional impact response of a penny-shaped crack in a nonhomogeneous strip is considered. The shear modulus is assumed to be functionally graded such that the mathematics is tractable. Laplace and Hankel transforms were used to reduce the problem to solving a Fredholm integral equation. The crack tip stress field is obtained by considering the asymptotic behavior of Bessel function. Explicit expressions of both the dynamic stress intensity factor and the energy density factor were derived. And it is shown that, as crack driving force, they are equivalent for the present crack problem. Investigated are the effects of material nonhomogeneity and strip‘s highness on the dynamic fracture behavior.Numerical results reveal that the peak of the dynamic stress intensity factor can be suppressed by increasing the nonhomogeneity parameter of the shear modulus, and that the dynamic behavior varies little with the adjusting of the strip‘ s highness.