罗布麻韧皮非纤维素生物降解的工艺基础

在综合国内外相关研究文献资料的基础上,介绍了开发罗布麻纤维的研究现状、麻类脱胶菌种及其工艺研究、麻类脱胶机理研究的基础工作。同时,指出了罗布麻韧皮中非纤维素生物降解研究的难点在于规范收获方法。     

非正弦系统广义无功功率及广义功率因数的物理解释

在应用相关技术分析电流电压波形与广义无功功率之间的关系的基础上，提出了电流电压波形相似和波形完全相似的概念，用此概念论证了广义功率因数是电流总体波形与电压总体波形完全相似程度的一种度量，明确了广义无功功率是由于电流总体波形与电压总体波形存在差异所造成的这一物理概念。文中还给出了电流电压波形相似系数和波形完全相似系数的定义式，其中波形相似系数描述了电流波形相对电压波形的非畸变程度和对称程度，波形完全相似系数等价于广义功率因数，表征了系统容量的利用率。     

东北草原植物残体腐解动态研究(简报)

东北草原植物残体腐解试验表明，植物残体腐解动态变化规律一致，前期腐解快、以后变慢。羊草的碳素残留率比草木樨的高，对于植物的不同器官残体，根的碳素残留率最高，茎次之，叶最低，试验结果还表明，植物残体不同埋深对碳素残留率也有影响，埋深7cm，植物残体的碳素残留率最低，埋深15cm稍高，覆盖在土壤表面的最高。这说明植物中的羊草、植物残体听 根和茎以及土壤深层的残体都有利于土壤有机质的积累，而草木樨、植物残体中的叶以及浅层植物残体都有助于养分向土壤释放，羊草和草木樨残体混合物的碳素残留率介于草木樨和羊草之间，说明羊草混种草木樨的共存对羊草残体的分解有利。     

高阶时滞神经网络模型的全局指数稳定性

对具有时滞的二阶Hopfield型神经网络平衡点的全局渐近稳定性问题进行了研究.在不要求连接权矩阵的对称性和输入输出函数的可微性与单调性,只要求系统的参数满足是一个M矩阵的情况下,利用推广的Hanalay不等式和上右导数导得系统全局指数稳定性的若干充分条件.为二阶时滞神经网络稳定性的新方法、新结论.     

Boundary Element Methods with Overlapping Domain Decomposition for Parabolic Problem

Boundary element method is a numerical method for solving partial differential equations. There are several formulations of boundary element method (BEM) applied to solve a parabolic differential equation.The approach,which employs time- dependent fundamental solution,allows longer time steps in time integration than other approaches,and this can cut down on time for computer implementation with high precision.Domain decomposition method,which decompose the domain that a given problem is to be solved into subdomains,has the advantages of reducing the large problem into smaller ones and reducing the complex problem into simpler ones,and allows parallel computing.An overlapping domain decomposition method is applied combining a boundary element formulation with time-dependent fundamental solution to solve a diffusion equation. Firstly, by domain decomposition, the problem divided into two problems on subdomains, and then the initial-Boundary problems are solved by boundry element method on each subdomain.Some numerical examples are presented to illustrate feasibility and efficiency of the method. The numerical experiments show that the convergence rate of the method is dependent with the overlapping degree of the subdomains.     

Mix Domain Decomposition Method with Boundary Element Method For Stokes Equations and Application

As the BEM was used in the knaggy domain,its approach error was big.Domain Decomposition Method change the problem in the knaggy domain to the problem in several convex domains which do not wrap.The whole solution is gained by alternating boundary conditions between Dirichlet condition and Neumann condition on the common boundary.Domain Decomposition Method for Stokes equations in the anomalistic knaggy domain is presented,the example of Domain Decomposition Method in the flow of the lake in GuiYang City is given.     

Accelerated Generalized Minimal Residual Algorithm

This paper studies the fundamental theory of the generalized minimal residual algorithm(GMRES(m))in Krylov subspace and specially the relationship between residual vector and Krylov subspace.The relationship of the algorithm convergence and the subspace be selected is further researched according the linear system about residual vector.It is posed that the convergence can be slowed down because there are so many very small eigenvalue in magnitude.And a accelerated method(AGMRES(m)) is proposed to improve the convergence of the GMRES(m).Theoretical analysis and numerical results show the reliability and efficiency of the algorithm.     

锥栗贮藏温度对淀粉降解速率的影响

研究了3个不同锥栗品种在1，5，10℃等不同温度下贮藏120 d，并研究了贮藏过程淀粉含量的变化和淀粉降解速率，将降解速率与贮藏温度、品质变化和贮藏时间相关联，建立了锥栗贮藏方程。根据该方程，淀粉的含量随贮藏时间和贮藏温度的提高而降低，在试验范围内，低温度效果比高温度效果好。锥栗的品质与贮藏时间、贮藏温度和品种有关。     

不同CO2浓度对玉米秸秆分解期间土壤腐殖质形成的影响

以往人们较多的研究了土壤有机碳与温室气体的源、汇关系问题,却很少研究温室气体对土壤有机碳本身分解转化和各组分性质的影响。为了探讨CO2浓度升高对腐殖物质形成转化的作用,本文通过室内人为高浓度CO2的培养试验,用腐殖质组成修改法研究了玉米秸秆分解期间（1~180d）土壤总有机碳（TOC）、水溶性物质（WSS）、碱提取腐殖物质（HE）、胡敏酸（HA）和胡敏素（HM）数量的动态变化规律及不同CO2浓度对有机碳各组分形成与转化的影响。结果表明：玉米秸秆分解期间,“新形成”的净TOC逐渐降低,净HE表现为先增加而后下降的趋势,HM的绝对数量逐渐下降。可提取腐殖物质中HA的比例（PQ）先增加后下降,最终趋于平稳,说明最初富里酸（FA）的形成速度大于HA,随培养时间的延长,FA和HA经历了一段相互转化的过程,最终达到动态平衡。30%CO2浓度（V/V）处理的TOC、WSS、HE和HM数量明显高于3%CO2浓度处理和正常CO2浓度（0.0375%）处理,其中WSS和HM反应更为敏感。但3%CO2浓度处理与正常CO2浓度处理的差异不明显。可提取腐殖物质的PQ的顺序是30%CO2浓度处理〉3%CO2浓度处理〉正常CO2浓度处理,说明CO2浓度增加更有利于FA而不利于HA的形成和稳定。