声波涡流法采油技术的研究与试验分析

为进一步尝试采油的新技术,研究了声波、涡流对流体的影响,V选择了鄯善采油厂和中原油田采油一厂油井作为试验井.结果表明,在声波涡量的综合作用下,可以使垢层破裂、滑脱,使原油质点从吸附状态变为游离状态,使油、水的渗流速度和渗流量提高,最终使产液中的液、气、固三相高度溶融并乳化,从而起到防腊、防垢、降黏、增油的作用.分析了现场的试验数据,表明实现了明显的节能效果,有效延长了加药清蜡周期,运行安全可靠,对油层无伤害,对岩层无污染,提高了原油的采收率.     

东亚地区春冬季气溶胶化学成分特性的数值模拟分析

根据东亚监测网2007年观测资料,分析了东亚地区春冬季气溶胶化学成分特性,结果 表明:(1)东亚地区春冬季气溶胶化学成分随地理分布而变化,其中:中国PM10、SO2浓度远高于其他国家,尤其是西北和西南地区;NO、NO2、NOx、NH3、HNO3高值区位于东南亚地区;菲律宾Na+、K+、Cl-含量高于其他地区;蒙古Ca2+居东亚地区之首;NH4+、SO42-高值区分别位于朝鲜、越南;东亚地区HCl、Mg2+、NO3-浓度分布较均匀.(2)东亚地区春冬季气溶胶化学成分中各离子浓度较低,但变化明显.(3)利用NCEP再分析资料,运行中科院大气物理研究所研制的嵌套网格空气质量预报模式系统(NAQPMS),对东亚地区2007年气溶胶春、冬季典型化学成分进行了模拟,模拟结果 基本上反映了东亚地区气溶胶化学成分特性,气溶胶主要分布在工业相对较发达国家和地区,与实测资料基本相吻合.同时,模拟结果 也反映出东亚地区气溶胶化学成分季节变化特征.     

Signal Blind Recovery in Communication Systems Using Support Vector Machines

This paper focuses on the applications of the support vector machines in solving the problem of blind recovery in digital communication systems.We introduce the technique of support vector machines briefly,the development of blind equalization and analyze the problems which need to be resolved of the blind problems.Then the applicability of support vector machines in blind problem is highlighted and deduced.Finally,merit and shortage of blind equalization using support vector machines which is already exist...     

An Extension of Algorithm on Symbolic Computations of Conserved Densities for High-Dimensional Nonlinear Systems

An improved algorithm for symbolic computations of polynomial-type conservation laws （PCLaws） of a general polynomial nonlinear system is presented. The algorithm is implemented in Maple and can be successfully used for high-dimensional models. Furthermore, the algorithm discards the restriction to evolution equations. The program can also be used to determine the preferences for a given parameterized nonlinear systems. The code is tested on several known nonlinear equations from the soliton theory.     

Effect of Post-Annealing on Microstructural and Electrical Properties of N^＋Ion-Implanted into ZnO：In Films

We fabricate p-type conductive ZnO thin films on quartz glass substrates by codoping of In-N using radio frequency magnetron sputtering technique together with the direct implantation of acceptor dopants （nitrogen）. The effects of thermal annealing on the structure and electrical properties of the ZnO films are investigated by an x-ray diffractometer （XRD） and a Hall measurement system. It is found that the best p-type ZnO film subjected to annealed exhibits excellent electrical properties with a hole concentration of 1.22 × 10^18 cm^-3, a Hall mobility of 2.19 cm^2 V^-1 s^- 1, and a low resistivity of about 2.33 Ωcm, indicating that the presence of In may facilitates the incorporation of N into ZnO thin films.     

某些非理想溶液的汽液相平衡方程及应用

提出一个简单的相平衡方程描述某些非理想溶液的汽液相平衡关系－ 用线性最小二乘法确定方程中的待定系数, 由该方程计算的汽液相平衡组成与实验值较吻合－ 将该方程与余国琮和ＣｏｕｌｌＪ方程结合, 可以近似地表示更多的非理想溶液的汽液相平衡关系－ 利用该方程导出了计算最少理论板数和最少传质单元数的公式, 并讨论了该方程在精馏计算中的若干应用     

矩型波导CO2激光器

通过对矩型波导激光器腔模理论的分析,指出在某些情况下矩型波导结构明显优于圆型结构。同时,设计了２×２×１４０ｍｍ金属－陶瓷结构的ＲＦ激励波导ＣＯ２激光器,输出功率最大为３．３９Ｗ,效率为６％。     

CONFINEMENT PROPERTIES OF THE PURE GAUGE FIELDS ON COSET SPACE OF AN ABELIAN CHIRAL GROUP

In this paper the lattice current-current propagator is calcdlated and the influence of coset pure gauge fields of an abelian chiral group G=U₁×U₁⁵ on confinement properties of a quark system is discussed by virtue of the Wilson's criterion in lattice gauge theory. When subgroup H is U₁, the coset pure gauge fields only contribute a perimeter law factor to the current current propagator which has no influence on confinement properties of the system. When subgroup H is U_s, the coset puregauge fields have no influence on wnfinement properties of the system either.     

GENERAL HOLOMORPHIC FUNCTIONAL INTEGRAL AND ITS EVOLUTION TO THE FEYNMAN KERNEL

This paper is devoted to establishing the relation between the holomorphic form of the functional integral and its Feynman form, as well as presenting a new way to evaluate the Feynman transformation matrix element by using the coherent state. The Feynman kernel for the harmonic oscillator with two time-dependent sources is thus derived. Besides these, by the use of the normal product form of the Wigner operator derived in Ref.[l] and the Weyl correspondence, the general holomorphic form of the functional integral and its evolution to the Feynman kernel are discussed.     

DOES THE CREATION OPERATOR α+ POSSESS EIGNVECTORS?

It is pointed out that the assertion that the eigenfunction of the creation operator a⁺ is identically zero is not rigorous.On the contrary, the eigenfunction of a⁺ may be discussed by using the contour integral representation of δ function, the property of which and the relation with the eigenstate of the annihilation operator are discussed. Its applications, especially the application in thoroughly studying the inverse operator's properties, are presented. It is shown that the phase operator can also be represented by the inverse operator.