Paleocurrent analysis on the basal conglomerate of the model Changzhougou formation in Qian’an

The paleoflow direction of the basal conglomerate of the Changzhougou formation is obtained by the paleocurrent analysis of certain sedimentary structures, and the ancient sedimentary environment of the Qian'an Region is determined by observing the psephicity and gradation of gravel in conglomerate. The results show that the paleoflow direction is from northwest to southwest, and the paleocurrent data manifest a single-peak style in a rose diagram. The average paleoflow direction in the Qian'an region is 265°. The basal conglomerate is of littoral facies, and the sediments of conglomerates are mainly sourced from Shanhaiguan.     

Stability of coupled impulsive Markovian jump reaction-diffusion systems on networks

This paper is devoted to the investigation of stability for a class of coupled impulsive Markovian jump reaction-diffusion systems on networks (CIMJRDSNs). By using graph theory, a systematic method is provided to construct global Lyapunov functions for the CIMJRDSNs. Based on Lyapunov functions and stochastic analysis method, some novel stability principles associated with the topology property of the networks are established.     

竞争战略与企业绩效关系研究综述

介绍了竞争战略的理论基础和分类范式,从直接关系和基于权变理论的关系两个视角,详细阐述了国内外学者关于竞争战略与企业绩效关系的研究现状,为企业获取竞争优势、选择恰当战略、提高绩效提供了理论与决策依据。     

烤烟修订标准农业转化验证效果初探

2010-2013年在湖北省恩施州开展了烤烟修订标准农业转化验证效果的研究,结果表明,修订标准中增加组别,同时减少级别,对部位的划分更为准确具体,组别和等级设置科学.取消了在实际生产中无商品量的无效等级,有效地满足工业需求和更加适应现代烟草农业的发展.     

基于目标导向的多属性决策属性价值公度方法

MACBETH方法在多个属性维度上确定出的一组属性Good值(或Neutral值)并不能真地具有保证属性价值公度的完全相同的偏好涵义.为克服该方法缺陷,基于包容性属性价值函数,通过引入数据包络分析技术和马尔可夫理论给出了以目标参照方案为导向的目标导向属性价值函数和多属性决策属性价值公度的方法程序.相比于具有较大随意性确定属性Good值和Neutral值的MACBETH方法,依赖目标导向属性价值函数的多属性决策属性价值公度程序具有更明显的科学合理性,因此具有发展MACBETH方法,推动实际决策应用该方法及相关多属性偏好关联决策模型的创新价值.基于决策实验的应用分析直接验证了多属性决策属性价值公度方法程序的科学有效性,间接验证了包容性属性价值函数和目标导向属性价值函数的科学理性.     

非奇异快速终端滑模控制

现有的非奇异终端滑模控制方法和非奇异快速终端滑模控制方法都存在收敛速度缓慢以及“收敛停滞”等问题,针对这些问题提出了一种改进方法。在保证控制器非奇异的条件下将原滑模面中指数项设计参数由分数扩展到正实数域,既提高了收敛速度又扩大了参数选择的灵活性;引入快速终端趋近律,将原来的线性或指数渐近趋近改进为快速终端趋近,提高了系统状态的趋近速度;对“收敛停滞”问题产生的原因进行分析,提出了设计参数所应满足的条件。最后对某无人平台进行航向跟踪数值仿真,仿真结果验证了改进方法的有效性。     

Periostin and its interacting proteins in the construction of extracellular architectures

Periostin is a matricellular protein that is composed of a multi-domain structure with an amino-terminal EMI domain, a tandem repeat of four FAS 1 domains, and a carboxyl-terminal domain. These distinct domains have been demonstrated to bind to many proteins including extracellular matrix proteins (Collagen type I and V, fibronectin, tenascin, and laminin), matricellular proteins (CCN3 and βig-h3), and enzymes that catalyze covalent crosslinking between extracellular matrix proteins (lysyl oxidase and BMP-1). Adjacent binding sites on periostin have been suggested to put the interacting proteins in close proximity, promoting intermolecular interactions between each protein, and leading to their assembly into extracellular architectures. These extracellular architectures determine the mechanochemical properties of connective tissues, in which periostin plays an important role in physiological homeostasis and disease progression. In this review, we introduce the proteins that interact with periostin, and discuss how the multi-domain structure of periostin functions as a scaffold for the assembly of interacting proteins, and how it underlies construction of highly sophisticated extracellular architectures.     

Robust output regulation problem for discrete-time linear systems with both input and communication delays

Recently, the robust output regulation problem for continuous-time linear systems with both input and communication time-delays was studied. This paper will further present the results on the robust output regulation problem for discrete-time linear systems with input and communication delays. The motivation of this paper comes from two aspects. First, it is known that the solvability of the output regulation problem for linear systems is dictated by two matrix equations. While, for delay-free systems, these two matrix equations are same for both continuous-time systems and discrete-time systems, they are different for continuous-time time-delay systems and discrete-time time-delay systems. Second, the stabilization methods for continuous-time timedelay systems and discrete-time time-delay systems are also somehow different. Thus, an independent treatment of the robust output regulation problem for discrete-time time-delay systems will be useful and necessary.     

大学生淘宝创业调查研究——以电子商务专业学生为例

通过对在校电子商务专业大学生进行问卷调查,分别从个人能力、货源问题、淘宝规则和创业环境几个角度对大学生淘宝创业现状进行分析,指出应通过加强大学生网上创业意识的培养、增加校企合作、充分利用政策支持和熟悉淘宝规则等方面推动大学生淘宝创业。     

COD测定废液中Ag2S04的回收循环利用研究

目的研究COD测定废液中Ag2SO4的回收和利用，实现资源的循环利用，提高利用效率，节约实验成本，减少环境污染。方法以COD测定废液为研究对象，将Ag2SO4通过NaCl转化为AgCl沉淀，再用Zn粒在酸性介质中进行还原，使AgCl转化为银粉；所得银粉在少量HN03存在的条件下，用浓H2S04氧化，将其转化为Ag2SO4，重新用于COD测定实验。结果通过一系列实验研究表明，有70％的银可以得到回收，所得Ag2SO4再次用于COD测定实验，标准样品的COD测定误差在许可范围之内；实际污水中COD的测定实验结果表明，Ag2SO4循环使用的测定误差平均为7．4％。结论实验证明回收的Ag2SO4可以作为COD测定实验的催化剂循环使用，可操作性良好，在节约实验成本的基础上，对于环境保护、减少污染物排放量方面有显著效果。但是COD测定结果的偏差较大，重现性有待进一步改进提高。