微量生物碳酸盐ICP-OES元素分析中的仪器优化

为优化电感耦合等离子体发射光谱仪（ICP-OES）测试微量生物碳酸盐中元素含量的工作条件,在Thermo—Fisher公司生产的iCAP6300 Radial型ICP—OES上,对1050组仪器条件、32种不同组成的标准溶液、36个谱线对和两种仪器校正工作曲线进行了测试;借助开源科学计算软件Scilab数据插值和可视化...     

模糊线性优化在厦门湾水体总磷环境容量计算中的应用

在应用POM模型进行厦门湾水动力、污染物扩散和各排污口响应系数场模拟研究的基础上,采用最优化法对厦门湾水体总磷环境容量进行计算.根据厦门湾海区特征和使用功能,将厦门湾划分成5个海区,分别在5个海区选取水质控制点.分别以各海区水质控制点总磷浓度作为约束条件,运用普通优化和模糊优化对厦门湾内22个排污口源强进行优化设计.分析结果表明,基于模糊线性优化方法进行排污口源强优化设计和环境容量计算可以实现排污口源强再分配,且能够更充分地利用厦门湾的纳污能力.     

产业内贸易与产业结构的优化——基于中国制造业动态面板数据的研究

＂十二五＂时期是促进中国工业转型和产业结构调整的重要机遇期。本文在统计分析中国产业内贸易与产业结构优化现状的基础上,分别检验产业内贸易与产业结构合理化和高度化之间存在的相关性,并运用动态面板数据模型进行回归分析,回归结果表明产业内贸易能有效促进产业结构优化,但在不同技术附加值的行业中存在差异,产业内贸易能有效提升高技术产业结构合理化水平,提升低技术、中等技术产业结构高度化水平。因此,有必要根据产业内贸易对不同技术附加值产业结构优化的影响制定产业政策,逐步实现产业结构的优化调整。     

模拟退火算法在基于LUT结构的FPGA工艺映射中的应用

介绍了采用现代较为常用的模拟退火算法对基于LUT结构的FPGA进行工艺映射的计算。首次采用点可见的编码方法对工艺映射的结果进行编码，在此基础上采用模拟退火算法进行计算，获得了较好的效果和收敛速度。     

Stochastic multiobjective optimization of reservoirs in parallel

A stochastic multiobjective optimization method for finding noninferior solutions of the operation problem of reservoirs in parallel is presented. This problem is characterized by a multiobjective optimization, a multireservoir system, and stochasticity of inflows, which represent three difficult aspects in reservoir system planning and operation. In this method, a constraint technique, decomposition iteration, and simulation analysis are employed conjunctively to deal with the three difficult aspects. The constraint technique is intended to transform the multiobjective optimization into a uniobjective one and the decomposition iteration in conjunction with the simulation analysis attempts to alleviate the dimensionality problem. The proposed methodology is applied to a reservoir system in the upper Tone River basin, which consists of three reservoirs in parallel and is operated primarily for three objectives: hydropower, water supply, and flood control. A total of 49 noninferior solutions for the reservoir system are obtained, from which the decision makers may be able to find the most satisfactory operating policy. Copyright © 2005 John Wiley & Sons, Ltd.     

Upper bound limit analysis using simplex strain elements and second‐order cone programming

In geomechanics, limit analysis provides a useful method for assessing the capacity of structures such as footings and retaining walls, and the stability of slopes and excavations. This paper presents a finite element implementation of the kinematic (or upper bound) theorem that is novel in two main respects. First, it is shown that conventional linear strain elements (6‐node triangle, 10‐node tetrahedron) are suitable for obtaining strict upper bounds even in the case of cohesive‐frictional materials, provided that the element sides are straight (or the faces planar) such that the strain field varies as a simplex. This is important because until now, the only way to obtain rigorous upper bounds has been to use constant strain elements combined with a discontinuous displacement field. It is well known (and confirmed here) that the accuracy of the latter approach is highly dependent on the alignment of the discontinuities, such that it can perform poorly if an unstructured mesh is employed. Second, the optimization of the displacement field is formulated as a standard second‐order cone programming (SOCP) problem. Using a state‐of‐the‐art SOCP code developed by researchers in mathematical programming, very large example problems are solved with outstanding speed. The examples concern plane strain and the Mohr–Coulomb criterion, but the same approach can be used in 3D with the Drucker–Prager criterion, and can readily be extended to other yield criteria having a similar conic quadratic form. Copyright © 2006 John Wiley & Sons, Ltd.     

Hydrological modelling of Ethiopian catchments using limited data

The hydrological component of the soil and water assessment tool (SWAT) model is adapted for two Ethiopian catchments based on primary knowledge of the coherence spectrum between rainfall and stream flow data. Spectrum analysis using the available nearby climatic data is made to limit the temporal and spatial scales (inverse rate coefficients) subject to the calibration of compartmentalized runoff models. The exclusion of unwarranted time scales in the calibration implies that the model efficiency (r² values) decrease only moderately between calibration and validation, and the optimization is focused on warranted problems. On the basis of the available data for the two Ethiopian catchments, the implication is that only periods longer than about 50 days can be reliably evaluated in the model. The model structure of SWAT for the surface runoff and groundwater flow response is modified to make the time scales consistent with the results of the spectrum analysis. An optimization algorithm is developed to constrain and combine the model parameters with the spectrum analysis results. Copyright © 2009 John Wiley & Sons, Ltd.     

阳极焙烧炉结构优化设计

对以重油作为燃料的阳极焙烧炉的火道结构进行了优化模拟计算。从炉子的设计角度提出了解决炉内流动场、温度分布不均匀的方案。分析了两种结构优化方案的可行性 ,并得出综合优化方案。适当的调整挡板的位置可以改善气流的分布。结果显示 ,综合优化方案对改善阳极焙烧炉的燃烧条件有着显著效果。数值模拟的方法为阳极焙烧炉结构和运行参数的优化提供了较准确、快速和经济的研究手段。     

黑河水库单薄山梁排水洞方案优选研究

黑河水库是解决西安市城市供水、农田灌溉及水力发电的大型水利水电工程。其左岸的单薄山梁既构成大坝坝肩岩体,蓄水后又成为一天然坝体。水库蓄水后的渗漏及渗透稳定性决定了水库能否安全高效的运行。黑河工程指挥部在防渗灌浆帷幕施工后,提出在帷幕下游增设单排排水洞。就此对排水洞方案进行了优选研究。     

SOIL SPATIAL ANALYSIS AND AGRICULTURAL LAND USE OPTIMIZATION BY USING GIS

This paper discusses the methods and process of Geographic Information System(GIS) applied in soil spatial analysis ,involving the collection of soil spatial data that GIS required ,spatial analysis method of soil nutrient,land use,slope and exposure of geography,crop yield and other factors,and also including acquiring soil spatial information and creating thematic map,and so on .Taking Hengjing Town in Wuxian County of Jiangsu Province as a case study and the maximum income as a principle,and applying the GIS methods and their interrelated models,we have calculated the most optimized agricultural land and the possible maximum income of Hengjing Town.According to the method,we can rationally regulate local agricultural production,and put forward some scenarios for optimizing agricultural structure of Hengjing Town .The paper puts forward an evaluation method of land adaptability based on soil spatial analysis,and offers some research clews to optimize agricultural land use constitutions.so the paper will be have important reference value for soil study.