Derivations of fractal models of city hierarchies using entropy-maximization principle

A pair of models of fractal recursion on city hierarchy, fm=f1r?1-m?f and Pm=P1r?m-1?p, are derived using entropy-maximizing methods, and the relationship of inverse proportion between the number (fm) of cities at a given level of the urban hierarchy and the average population size (Pm) of the fm cities is established, i.e fm∝1/P. It is demonstrated that the underlying rationale of both the scale law of city rank-size distribution and the Zipf dimension value in standard state (dz=lnrp/lnrf=1) rests with maximization of information entropy of city hierarchies.     

高校党外知识分子思想政治工作研究

分析了高校党外知识分子思想政治工作的现状,从高校民主党派组织生活不够完善、党派意识不够、党外知识分子具有的新特点及各级人大、代表等的换届工作需要等方面论述了加强高校党外知识分子思想政治工作的必要性,并从掌握党外知识分子思想动态、编制党外知识分子思想政治工作规划、推出党外知识分子思想政治工作举措以及完善制度机制等方面阐述对加强高校党外知识分子思想政治工作进行思考。     

A Comparison of SuperDARN-Derived Plasma Convection and DMSP Ion Drift Measurements

Recently several studies indicated possible deterioration of accuracy in the SuperDARN convection measurements at large distances （〉2 500 km）. In this study, the SuperDARN-derived convection was compared with ion drift measurements given by the DMSP satellites, focused on SuperDARN far-range measurements, to investigate the above-mentioned problem. Two different procedures of SuperDARN convection estimation were applied. An overall reasonable agreement between two observation systems were found though individual points in some passes show significant differences. Besides, a tendency is also clear that the SuperDARN-derived velocities were slightly smaller than those of DMSP ion drift measurements. Potential factors contributing to the velocity differences were explained.     

Method of Satellite Fault Diagnosis Based on Bayesian Network

1Introduction Satelliteisacomplexsystemandconsistsofmany componentstobeusedfordifferentfunctions.Satellitewill beinfailureifsomecomponentsdegradeorfail.Thefailure affectsthenormalapplicationofthesatelliteseverely[1].The goaloftheresearchinthispaperistodeduceoravoidthe affectionsandlossescausedbysatellitefailure,inorderthat thesatellitecanremainavailablewhensomecomponentson satelliteareatdegradationorinfailure.ProfessorDudaPearlproposedBayesiannetworktheoryin1988.Themethodofsatellitefaultdiag…     

有限集合上的Fuzzy集方程与Fuzzy关系方程

在文〔１〕基础上，将普通集合方程推广到有限集合上的Ｆｕｚｚｙ集方程和方程组，并讨论了Ｆｕｚｚｙ关系方程．     

单纯形法程序中的“陷井”

本文指出了广泛流行的一些书中关于单纯形法的一个逻辑错误,分析了错误产生的原因,并指出了求解的正确途径。     

Endonuclease G is a novel determinant of cardiac hypertrophy and mitochondrial function

Left ventricular mass (LVM) is a highly heritable trait and an independent risk factor for all-cause mortality. So far, genome-wide association studies have not identified the genetic factors that underlie LVM variation, and the regulatory mechanisms for blood-pressure-independent cardiac hypertrophy remain poorly understood. Unbiased systems genetics approaches in the rat now provide a powerful complementary tool to genome-wide association studies, and we applied integrative genomics to dissect a highly replicated, blood-pressure-independent LVM locus on rat chromosome 3p. Here we identified endonuclease G (Endog), which previously was implicated in apoptosis but not hypertrophy, as the gene at the locus, and we found a loss-of-function mutation in Endog that is associated with increased LVM and impaired cardiac function. Inhibition of Endog in cultured cardiomyocytes resulted in an increase in cell size and hypertrophic biomarkers in the absence of pro-hypertrophic stimulation. Genome-wide network analysis unexpectedly implicated ENDOG in fundamental mitochondrial processes that are unrelated to apoptosis. We showed direct regulation of ENDOG by ERR-α and PGC1α (which are master regulators of mitochondrial and cardiac function), interaction of ENDOG with the mitochondrial genome and ENDOG-mediated regulation of mitochondrial mass. At baseline, the Endog-deleted mouse heart had depleted mitochondria, mitochondrial dysfunction and elevated levels of reactive oxygen species, which were associated with enlarged and steatotic cardiomyocytes. Our study has further established the link between mitochondrial dysfunction, reactive oxygen species and heart disease and has uncovered a role for Endog in maladaptive cardiac hypertrophy.     

A high-order newton-like method

This paper gives a new iterative method to solve the non-linear equation. We prove that this method has the asymptotic convergent order. When the iterative times exceed 2,only one evaluation of the function and one of its first derivative is required by each iteration of the method.Therefore the new method is better than Newton’s method.     

黄陵地区延长组长6段深水砂岩储层特征分析

以鄂尔多斯盆地黄陵地区延长组长₆段为研究对象,基于区内丰富的钻井取芯、测录井及分析化验资料,对长₆段深水砂岩特征及不同砂体类型储层之间的差异性进行了分析。结果表明,根据砂体形成机制及其构造特征的不同,研究区砂体类型可划分为砂质碎屑流砂体、砂质滑塌砂体及浊流砂体3大类。其中,砂质碎屑流砂体的石英、长石含量及结构成熟度相对较高,储集空间以长石溶孔和残余粒间孔为主,储层物性也明显优于其他两类砂体。进一步分析发现,由于结构成熟度和矿物含量的差异,砂质碎屑流砂体成岩早期抗压实压溶作用更强,中晚期易溶矿物溶蚀增孔、构造破裂增缝等建设性成岩作用也较为强烈,从而决定了砂质碎屑流砂体是研究区最有利的储集岩体。     

小鼠左右生殖器官生育机能的差异

本实验观察了怀孕１０天以上的封闭群ＫＭ母鼠，近交系Ｃ＿（５７）ＢＬ／６ｊ母鼠，近交系ＢＡＬＢ／ｃ母鼠，杂交（ＤＢＡ／２×ＬＣＥＢ）Ｆ＿１母鼠和杂交（Ｃ＿（５７）ＢＬ／６ｊ×ＬＣＥＢ）Ｆ＿１母鼠的卵巢上黄体数和子宫内的胚胎数。在五组实验中观察结果（见表１，２）。在近交系方面，Ｃ＿（５７）ＢＬ／６ｊ实验组出现左右两边生殖器官的生育机能差异显著（Ｐ＜０．０１），在其他实验组中，左右两边生殖器官的生育机能差异不显著（Ｐ＞０．０５）。由于它们的遗传背景不同，在各自的繁殖基因控制下，可以出现这些遗传多态现象。