Stochastic simulation of fluid flow in porous media by the complex variable expression method

A stochastic simulation of fluid flow in porous media using a complex variable expression method （SFCM） is presented in this paper. Hydraulic conductivity is considered as a random variable and is then expressed in complex variable form, the real part of which is a deterministic value and the imaginary part is a variable value. The stochastic seepage flow is simulated with the SFCM and is compared with the results calculated with the Monte Carlo stochastic finite element method. In using the Monte Carlo method to simulate the stochastic seepage flow field, the hydraulic conductivity is assumed in three different probability distributions using random sampling method. The obtained seepage flow field is examined through skewness analysis, and the skewed distribution probability density function is given. The head mode value and the head comprehensive standard deviation are used to represent the statistics of calculation results obtained by the Monte Carlo method. The stochastic seepage flow field simulated by the SFCM is confirmed to be similar to that given by the Monte Carlo method from numerical aspects. The range of coefficient of variation of hydraulic conductivity in SFCM is larger than used previously in stochastic seepage flow field simulations, and the computation time is short. The results proved that the SFCM is a convenient calculating method for solving the complex problems.

Express Methods for Measurement of Electroconductivity of Semiconductor Layered Crystal

We describe theoretically the grounded method of measuring the conductivity of anisotropic layered semiconductor materials. The suggested method implies the use of a four-probe testing device with a linear arrangement of probes. The final expressions for identifying the electrical conductivity are presented in the form of a series of analytic functions. The suggested method is experimentally verified, and practical recommendations of how to apply it are also provided.

尤金·奥尼尔的表现主义手法

尤金·奥尼尔的悲剧主要表现的是小人物在现代社会中心灵世界的痛苦挣扎 ,他的戏剧可谓现代人的精神悲剧。从语言手段和非语言手段两方面探讨奥尼尔的表现主义手法 ,及其在舞台上展现的现代人内心深处的困惑及其痛苦挣扎。

北方岩溶矿床水文地质图编制理论和方法

以岩溶水系统理论为基础，将矿区富水性条件，矿井突水条件和矿井水实际资料，有机地结合起来，进行量化、分区，以新颖，直观的方法表现在图上，使图件具有很强的实用性。

Strategies for the Construction of Vernacular Landscape in Urban Gardens

Vernacular landscape is the carrier of traditional techniques and local culture.The construction of vernacular landscape has gradually become the basic direction of modern urban garden design.Based on the analysis of the extraction and application of vernacular landscape elements,the application forms and design principles of each element in urban gardens are pointed out.At the same time,taking the artistic expression method of integrating vernacular landscape elements into garden landscape as the starting point and combining with case analysis,the design principles and main planning points of building vernacular landscape are put forward,and some strategies for the construction and protection of vernacular landscape in the planning of garden landscape in different regions are proposed.

美学方法论和艺术本质观——从东、西方古典美学看艺术的审美本质

本文从美学方法论的角度 ,以对东西方古典美学艺术本质观的论述为基础 ,结合当前的文艺实践 ,对艺术本质给予了现时代的规定。本文认为 ,西方古典美学和艺术思想的基本特征 ,是以纯哲学和社会学的方法研究艺术 ,把艺术规定为是一种特殊的认识活动 ,将摹拟、再现、认识看作是艺术的本质特征 ;而中国古典美学则主要是以伦理学与哲学的辩证统一、艺术哲学和艺术心理学相统一的方法观察和研究艺术 ,把情感看作艺术的特质 ,将抒情、写意规定为是艺术的基本特征。东西方古典美学各自在艺术本质问题上的合理性和片面性 ,以及当今东西方艺术发展的趋势 ,说明对艺术本质的思考和探求 ,既不能单纯执着于表现主义 ,也不能固守于理智主义 ,而是应该扬弃其各自的片面性 ,对东西方古典美学的艺术本质观 。

具象表现绘画方法的教学应用价值

具象表现绘画是以具象为主体的艺术,用抽象表现主义的夸张和变形的形式,表达艺术家在视觉认知中对事物真实性的看法。作为一种绘画方法,它要求面对事物本身,现象学式的“看”,在视觉和意识的不断感知和流变的过程中,把握对象,直指事物存在的真实状态,表达自己内心深处的心象世界。它有助于观念的更新和创新精神的培养。

土壤抗冲性及其影响因素研究进展

通过回顾土壤抗冲性研究历程,归纳了不同的土壤抗冲性表征方式,总结了土壤抗冲性不同测定方法的优缺点,综合探讨了土地利用类型、植被作用和地形坡度等外在影响因素,以及通过不同程度影响或改变土壤的理化性质导致其抗冲性差异的情况,认为土壤抗冲性表征方式和实验方法需规范统一,研究机理和研究尺度有待深入扩展,使得研究成果更好地服务于水土保持实践。