Neural Approach for Calculating Permeability of Porous Medium

Permeability is one of the most important properties of porous media. It is considerably difficult to calculate reservoir permeability precisely by using single well-logging response and simple formula because reservoir is of serious heterogeneity, and well-logging response curves are badly affected by many complicated factors underground. We propose a neural network method to calculate permeability of porous media. By improving the algorithm of the back-propagation neural network, convergence speed is enhanced and better results can be achieved. A four-layer back-propagation network is constructed to effectively calculate permeability from well log data. Spontaneous potential, resistivity of deep lateral log, resistivity of micro-gradient log, resistivity of micro-normal log, Interval transit time of acoustic log and resistivity of shallow lateral log are selected as the inputs, and permeability is selected as the output. There are 35 and 40 units used in the two hidden layers, respectively. During the training course, the correlation coefficient between the calculated permeability and the standard pattern is as high as 0.9937, the average absolute error between them is 0.046μm^2 and the average relative error is only 1.93%. for practical applications, the average relative error between the calculated permeability and actual permeability is also as low as about 10.0%.     

纳米ZnO胶体可见发射机制的研究

关于ZnO可见发射机制的讨论目前尚无定论。本文研究了不同颗粒尺寸的纳米晶ZnO胶体的发射性质,观测到两个发射带,其中之一是激子发射,另一个是可见发射;发现两个发射带的峰值能量之间存在线性关系,并由此提出了可见发射机制是来自导带的电子到深陷阱的跃迁。     

新模式热电联产系统:联产供热的一个发展

1前言经济的迅猛发展，能源与水源的供需矛盾的突出，环保形势的严峻要求用能的“文明化”。文明用能应是跨世纪和新世纪用能战略的基本原则。文明用能的一个极重要方面就是对热能的文明利用问。热电联产是热能文明利用不可替代的途径。本文提出一种热电联产的新模式，旨在通过这种模式把联产供热规模化，大幅度地节约能源和水资源，减轻电能与热能的生产对环境的不利影响。最近中央提出的可持续发展战略，应成为我们今后技术研究的一个指导性方针。节约能源、水源和保护环境是这一战略的重要组成部分。在世界范围内，对节约资源保护环境问…     

Preparation of Molecular Sieve Catalyst and Application in the Catalytic Oxidation Treatment of Waste Water

Citric acid is an important additive in foods, cosmetics, medicine and so on, but it discharges about 10 ton of factory effluent when 1 ton of citric acid is produced. The COD of the factory effluent is near 20000 mg/L. The treatment of citric acid factory effluent is a serious problem in environmental chemistry. It is found that molecular sieve support metal complexes have high catalytic activity in aerobic oxidation of alkene [1,2]. In this paper, a kind of molecular sieve catalyst was prepared. The catalyst was used for the treatment of citric acid factory effluent by method of catalytic oxygen oxidation.     

空中交通流量管理中的改航策略研究

针对在恶劣天气下出现的大规模航班延误情况,根据机场和航路段的动态容量约束,建立了改航策略模型,并提出求解该模型的有效算法.选择全国航班时刻表进行仿真,仿真结果表明:该模型提供了在恶劣天气下更安全、更经济的航班改航策略,可为战术级流量管理提供辅助决策.     

X射线光刻技术的进展及问题

Ｘ射线光刻是一种能满足下世纪初超大规模集成电路（ＶＬＳＩ）生产的深亚微米图形加工技术。论述了这种光刻技术的发展历史及近年来的主要进展。重点讨论了在Ｘ射线源、接近式曝光和全反射投影曝光等方面取得的成就与存在的问题。展望了这种技术的发展前景     

179Au的1/2[660](πi13/2)转动带

利用能量为164—180MeV的³⁵Cl束流,通过重离子核反应¹⁴⁹Sm(³⁵Cl,5n)研究了¹⁷⁹Au的高自旋态能级结构.实验进行了γ射线的激发函数、X-γ和γ-γ-t符合测量.基于对实验测量结果的分析,首次建立了¹⁷⁹Au的1/2[660](πi_13/2)转动带.结合已有的实验数据,着重讨论了奇AAu核中1/2[660](πi_13/2)转动带的带头激发能随中子数的变化     

Single Crystal Si Layers on Glass Fabricated by Hydrophilic Fusion Bonding and Smart-Cut Technology

A single crystal Si thin film on a glass substrate has been obtained successfully by hydrophilic fusion bonding and the smart-cut technology. Tensile strength testing shows that the bonded interface has strong adhesion and the bonding strength is about 8.7MPa. Crystallinity and microstructure of the samples have been characterized by transmission electron microscopy (TEM). Electrical properties have also been investigated by Hall measurements and four-point probe. The mobility of the transferred Si layer on glass is about 122cm^2//V.s. The results show that the single-crystal silicon layer transferred onto glass by direct bonding keeps good quality for the applications of integrated circuits, transducers, and fiat panel display.     

对称陪集空间上非线性σ模型的Bäcklund变换,定域与非定域的守恒律

本文讨论了定义在对称陪集空间上的二维非线性σ模型。应用对偶对称性导出了依赖于某一连续参数γ的一种广义Bäcklund变换,得到了依赖于参数γ的守恒流。把这个流在γ=1附近按幂次展开得出一个无限系列的非定域守恒流。把这个流稍作改变,并按γ或γ^-1的幂次展开,可以得出两个系列的无限多个定域守恒流。     

Optical Imaging System with LaserGated Brightness Amplifier

l.IntroductionTheideaofusingahigh-gainactivemediumtoformbrightness-enhancedmicroscofr-.icimageswasproposedmorethan2oyearsago[1:.Introductionofbrightnessamplifierintousua1oPticalsystemwouldPermittoovercomethewellknownrestrictionaccordingtowhichthebrightnessattheoutputoftheopticalsystemcannotexceedthatatthein-put[zJ.SomepulsedmetalvaporlaserssuchasthecopPervaPOrlaser(CVL)havebeenusedasimage-brightnessamplifiersinvariousopticalprojectionsystem[3j-lnthiscase,wecanbenefitfromthattheactivemedium…