非牛顿钻井流体流动计算机智能解析方法

钻井液体在环形钻杆空间中的运动,可归结为幂律流体管内流动和螺旋流动。由于幂律流体的本构方程,在运动方程中产生速度梯度的非线性项,求解过程比较复杂。因此应用计算机符号运算、改进的Kantorovich变分法和幂律流体模型相结合,并采用局部线性化的方法,提出了解决运动方程中出现的非线性问题的方法,即计算智能解析方法应用于非线性问题,研究了幂律流体管内非定常流动,研究方法及其结果可以推广到幂律流体螺旋流动情形。     

切换线性超循环系统的稳定性分析

超循环---生物学中重要模型, 具有广泛的实际背景. 本文将超循环系统扩展为切换超循环系统. 循环矩阵的循环结构为研究切换超循环系统的稳定性提供了有效的方法, 给出切换线性时变超循环系统在任意切换律下渐近稳定的充要条件和切换线性定常超循环系统可切换镇定的充分条件.     

试论职业学校经济法教材体系

近几年,我国的职业教育在蓬勃发展,构建适合非经济法专业以及非法律专业的职业学校《经济法》教材体系显得尤为重要,本文对其基本原则、内容及意义进行阐述。     

高速公路路网动态规划方法的研究与设计

在高速公路路网布局的确定中,一是节点重要度的确定,另一是路网中各条线路联接和组合的方法。基于某环岛高速公路的勘察数据,提出动态规划的路网规划设计的框架。在规划框架下,重点研究了动态规划的思想。最后对路网中各条路段和线路进行联接、组合,建立了规划方法的数学模型,并设计了相应的算法。     

Adsorption of Carbon Disulfide (CS2) in Water by Different Types of Activated Carbon—Equilibrium, Dynamics, and Mathematical Modeling

Adsorption equilibrium and kinetics of carbon disulfide in water by granular activated carbon (GAC), powdered activated carbon (PAC), and activated carbon fiber (ACF) were investigated and compared in an effort to elucidate the fundamentals for optimizing the control process design. It has been shown that the BET expression can satisfactorily describe the adsorption equilibrium of carbon disulfide (CS2) on GAC, PAC, and ACF and the corresponding kinetic experimental data properly correlated with the second-order kinetic model, which indicates that the CS2 adsorption is the rate-limiting step. A two-phase mathematical model was developed to simulate CS2 transfer in fixed-bed operation filled with the GAC, PAC, and ACF, and the equilibrium and kinetics information is subsequently used in the model to characterize the dynamics of adsorption. The model includes mechanisms such as axial dispersion, advection, liquid-to-solid mass transport, and intraparticle mass transport by pore and surface diffusion. It is manifested that the model was able to predict the dynamic breakthrough curve of CS2 in a fixed-bed adsorption column filled with GAC, PAC, and ACF at varied conditions (standard deviations for 1.5?cm/min is 12.13% and for 2.2?cm/min is 16.12%), based on BET-3 equilibrium and second-order kinetics, which indicates that the methodology proposed by this work could be employed for adsorbents selection, adsorption design, and process optimization for CS2 waste-water emission control.     

Chemical-Enhanced Washing for Remediation of Soils Contaminated with Marine Diesel Fuel in the Presence/Absence of Pb

The effects of the operating conditions, the initial concentrations of marine diesel fuel (MDF) and the coexisting Pb in the soil, and the ethylene diamine tetra acetic salt (EDTA) in solution on MDF removal by sodium dodecyl sulfate (SDS) washing were extensively investigated with the aim of optimizing the process parameters and determining the MDF removal efficiency by SDS under different contamination conditions. The experimental results from batch tests indicated that the majority of MDF was removed by SDS in the first 2?h, and its optimal pH was nearly neutral. Increasing the SDS concentration linearly increased the MDF removal efficiency. At a given SDS concentration, the removal efficiency was dependent on the existing forms of MDF in soils, and the free phase of MDF was found to be more easily removed than the adsorbed phase. MDF removal by SDS was significantly reduced by the coexisting Pb in soils, which likely forms a complexation with SDS and thereby enhances the partitioning of MDF in the soil by the re-adsorption of released MDF onto the hydrophobic tails of the adsorbed SDS. EDTA alone, or with SDS, could remove MDF, but the remaining MDF in the contaminated soil after EDTA washing became more difficult to be removed by SDS. Therefore, the EDTA washing followed by SDS washing is not recommended for MDF removal.     

努力实现节能降耗新突破

文章用数据说明了当前实现2010年节能降耗目标的极端严峻性,阐述了工业企业在全国节能降耗中的重要地位、存在的主要问题以及实现节能降耗的途径。指出在党中央和国务院强力推动下,实现2010年节能降耗的约束性指标是有希望的。     

电力线载波通信中的自动增益控制技术

在电力线载波通信系统中,电平的稳定与否直接影响着载波通信系统的传输质量。在恶劣电力线通信环境下,只有努力提高自动增益控制(AGC)水平,才能实现信号电平的稳定。文章介绍了一项针对电力线载波通信数字接收机的自动增益控制技术。在分析研究了各种AGC算法的分类及其应用的基础上,选择其中2种AGC算法,设计出一种模拟和数字相结合的2级AGC控制方案,并通过仿真实验结果证明了该方案的可行性和有效性。     

逻辑固法：对法律逻辑作用的感悟

虽然在近百年的西方法学中，逻辑的功能受到了一些学者的批判，但必须看到，法律与逻辑有着不可分割的联系。从法律方法论的角度看，逻辑规则在解释法律、论证法律的时候有固定法律意义的功能。所以，法律学人必须认真地对待逻辑尤其是形式逻辑。这对法律思维方式的形成、法制建设、法学教育等有着重要的意义。     

论制造成本法的改进

提出了利用完全成本法的思想改进制造成本法的相关对策，建议在产品成本计算过程中应该更多地关注相关成本以及无形成本，如研发费用、环境成本、人力资源成本，无形资产等等与产品生命密切联系的成本费用，从而为产品定价提供更合理、更有力、更准确的依据，为企业经营管理创造更宽阔的空间。