基于熵权TOPSIS方法的中国渔业发展水平综合评价研究

渔业是我国国民经济的重要组成部分,对农民增收具有较为重要的意义。我国渔业生产地域分布差异明显,为了对我国渔业发展水平进行综合评价,构建了渔业发展综合水平评价指标体系。基于熵权TOPSIS方法,利用2012年中国省级数据计算指标权重,并对中国各省市区渔业发展综合水平进行了综合评价。研究结果表明,中国的渔业发展综合水平呈现较为明显的区域差异,一方面,东部区域与中部区域内省区排名均存在两极分化格局;另一方面,西部区域与东北部区域整体发展水平较低。基于研究结果,探讨了相关的政策含义。     

基于县域GWR模型的国土资源执法满意度的空间分析——以新疆阿克苏地区为例

以新疆国土执法监察情况为研究对象,在研究阿克苏地区土地执法监察现状、问题和原因的基础上,解读新疆地区土地执法监察体系建设存在难点,并提出思考。在满意度调查问卷基础上引入Logistic模型回归检验,构建满意度方程,分别对2006、2010、2014年阿克苏县域满意度进行空间分析和驱动因素分析。结果显示,(1)从问卷情况看,地方财政收入与经费预算情况等客观经济因素制约硬件设备及执法手段;巡查路线固定可能留有执法死角或背影范围;违法宣传教育工作仍然是执法监察系统内外部高度关心方向。(2)从执法空间格局上看,东北县(市)执法满意度较高,西南县(市)较低;农村居民用地并不是主要违法对象;城市人口增长与土地违法情况恶化呈正相关,城市化进程中违法情况和执法难度呈现出加大趋势;民族成分与执法满意度呈负相关,表现为少数民族比重越大,地区执法情况越复杂、形势越严峻。国土执法监察是维护土地管理和土地市场秩序的基本途径,需多渠道不断加强完善,提高执法成效,实现土地资源开发利用的可持续发展。     

土地质量分级方法及其在黄峪口小流域的应用(英文)

土地分类法是土地资源合理利用和规划研究中首先要解决的一个问题．在以往的土地分类研究中，一般是以“地块”为土地单元，“地块样本”是分类的对象，其数据是以地貌部位、利用现状、坡度、坡向、土壤种类、土壤侵蚀类型等众多指标因子（定性因子居多数）来表现某一特定“地块”的特征．按各个“地块”在不同指标因子上的不同“表现”，分别用数字１，２，３，…等将其“量化”，然后用普通多元统计分析中的距离度量方法，以欧氏距离、最大（最小）距离、相似系数…等间隔尺度的统计量，来衡量地块样本之间“相近”或“相离”的尺度，采用动态聚类或系统聚类等方法，对“地块”进行分类．这里值得注意的是：地块样本的数据具有定性、高维、离散的特点，尽管可以进行“量化”处理，以数字１，２，３，…等来表示，但这些数字只是用来表示不同程度的“标志”而已，它本身并没有任何“量”的含义，更没有“大”与“小”的区别．那么对这样“量化”的数据采用普通多元统计分析中定义距离的方法，显然很不妥当，因为这样计算得到的距离，并不能真正反映出地块样本之间的实际“距离”．因此有必要重新认识“地块样本”之间的“距离”，正确而客观地对其进行科学的分类．本文依据地块样本数据定性、高维、离     

橡胶树立木材积表的编制研究

在雷州半岛地区，对幼龄、中龄和老龄橡胶林进行了调查，按径级测定了５０株标准木的材积，应用加权最小二乘法拟合了在材积方程建造上常用的１６个方程。采用ＦＩ（Ｆｕｒｎｉｖａｌ′ｓｉｎｄｅｘ）指数选择最佳拟合方程，橡胶树单木带皮、去皮材积最佳拟合方程分别为：Ｖｄ＝３．８×１０－５Ｄ２Ｈ－０．００００６３；Ｖｑ＝３．１×１０－５Ｄ２Ｈ－０．０００１０２。两模型总的系统偏差都小于±３％，满足编制材积表要求，并利用模型编制了橡胶树立木材积表，可供生产中应用、参考。     

Numerical Analysis of the Streaming Potential in Bone Tissue

Biphasic porous medium model,based on the mixture theory in continuum mechanics frame,is used to depict the distributing disciplinarian of sclerotin's stress field,distortion field and pore pressure when the bone tissue is subjected to various dynamic loadings.The coupling relationship among the distortion,fluid flow and the streaming potential is studied.The penalty finite element formulation for streaming potential is studied.The penalty finite element formulation for streaming potential distributing in bone tissue is obtained by using Galerkin weighted residual method for the biphasic porous medium model with corresponding initial and boundary conditions,in this modeling,the solid phase is assumed to be isotropic elastic medium,and the fluid phase is ideal fluid.The computational results show that because of the distortion of bone tissue the marrow's flow is raised,then the electriferous partical moves in the porous and the streaming potential appears.     

Face Recognition Based on Weighted PCA

This paper proposes a face novel recognition method based on Weighted PCA, which combined weighted features with PCA. At first, we calculate the weighted subspace for each class by minimizing the weighted reconstruction error. Then a test example is classified by the distance from weighted subspace. The experiments on Cambridge ORL database show that our Weighted PCA method can improve the recognition rate significantly without increasing the computation, when compared with PCA.     

CALCULATION OF THIN PLATES BENDING EEFORMATION AND CRITICAL PRESSURE BY THE TCHEBYCHEV''S POLYNOMIALS

In this paper trial functions of the second Tchebychev's polynomials is used with Cantorovich variational method in energy functional of thin plate. Bending deformaion of rectangle plate under even loads or concentrate force with several bearing and critical pressure in buckling is resolved. Though the first similar is used but calculations indicate that this method is simple and exact in engineering.     

Machine Vision Aided Testing System for Flatness Based on Equal Inclination Interference Theory

An approach is described on the automated tracking of interference circle fringe to get the flatness accurately based on the Equal Inclination Interference Theory (EIIT). The system,based on the theory of EIIT, can be applied to grasp the changing fringe information, which is white alternating with black through the CCD camera. Following the basic principle of fringes image centro-symmetric, we create some windows, process only the interference fringes information in the windows. According to the position of the processed interference fringe and the position of the last adjacent interference fringe in the windows, the interference fringe variation value N from the starting measured point is received, it implies the changed altitude value from the starting measurement point. This method allows us not only get the fringe information of the half-wavelength integer multiple but also denote those of the half-wavelength decimal multiple. The system is proved to be effective experimentally. It is useful in metrology department for the high-precision flatness standard unit.     

长江经济带水生态环境综合评价及区域差异

[目的] 对长江经济带水生态环境状态进行评价,为该区域制定相应的生态保护政策提供科学依据。[方法] 以DCSM模型和质性分析结果为框架,选取包含“驱动力—承载源—承载状态—管理”4个子系统的22个水生态环境指标。利用随机森林降维,确定12个高相关指标作为综合评价体系,结合加权秩和比模型和对抗解释结构模型对长江经济带11个省份2010—2019年水生态环境定级,并依据优劣程度确定排名。[结果] ①就整体而言,长江经济带各区域水生态环境差异明显,呈现下游优,上游次之,中游较差的非对称“U”型特征分布。 ②就空间分布而言,浙江水生态状态排名靠前,江苏、云南、贵州、安徽、江西、四川、重庆、湖北水生态状态排名呈“阶梯状”递减,湖南、上海排名靠后。 ③就分类指标而言,工业废水重复利用率、万元农业生产总值耗水量、万元工业产业增加值废水排放量等对水生态环境具有显著影响。[结论] 长江经济带总体水生态环境仍未达到安全稳态,因地制宜从多方面提升水生态环境质量,是推动长江经济带高水平可持续发展的重要动力。     

Imaging diagnosis--magnetic resonance imaging findings in a dog with sequential brain infarction

An adult greyhound was evaluated on three occasions for acute, intracranial neurologic signs. Based on magnetic resonance (MR) imaging, there were T2‐hyperintense and T1‐hypointense, noncontrast enhancing lesions in the cerebellum, and brain stem. Using diffusion‐weighted imaging (DWI), the lesions were characterized initially by restricted water diffusion. The presumptive diagnosis on each occasion was acute ischemic cerebrovascular accident leading to infarction. This allowed us to characterize the changes in appearance of infarcted neural tissue on the standard MR sequences over time, and to confirm that the DWI could be successfully used in low‐field imaging. © 2012 Veterinary Radiology & Ultrasound.