生灭过程逆局部时的构造及性质

利用游程理论来研究生灭过程,对于特征数R〈∞的生灭过程,建立了其在∞处的局部时、逆局部时及Poisson点过程,说明了右逆局部时是一个＂杀死的＂从属子,并给出其对应的漂移系数、Levy测度及＂杀死的＂速度.     

不等式解题常用技巧点拨

<正>一、运用区间的交、并运算解不等式简单不等式x>-1与区间(-1,∞)对应,简单不等式x<2与区间(-∞,2)对应。不等式(x+1)(x-2)<0的解集-10的解集x<-1或x>2对应的区间为(-∞,-1)∪(2,∞)。所谓解     

关于非线性压缩型映象的一个不动点定理

本文中均设(X,d)是一完备的度量空间,T,S是X→X的映象对,在O_T(X;0,∞)={x_a=T~(?)x}_(?)~∞=0(这里{x_(?)=T~(?)x}是迭代序列)称为T在x处生成轨道;记δ(O_r(x;0,∞))=Supd(T~(?)x,T~(?)x)称为0_r(x;0,∞)的直径.设对每一对x,y∈X,δ(O_r(x;0,∞)UO_(?)(y;0,∞))是有界的.称函数φ(t)满足如下条件叫做满足条件(φ_1):φ:[0,∞)→[0,∞)对t是不减和右连续的(即设{t_a}是非负值的单调减的序列,当t_a→t时,就有φ(t_(?))→φ(t))而且对每—t>0,有φ(t)0,φ~n(t)→0(n→∞),这里φ~n(t)表φ(t)的n次迭代函数.2°任一满足下面条件的非负实数列{t_(?)}_(?)~∞(?)     

二阶非线性中立微分方程的振动

考虑二阶中立时滞微分方程 [a(t)(x(t) p(t)(t-τ))’]’ q(t)f(x(t-σ))=0 (E)其中τ与σ是非负常数,a,p,q∈C([t_0,∞)R)且f∈C(R,R),提出了方程(E)的某些新的振动条件。     

关于第(16)类压缩型映象的不动点定理的推广

本文证明了:当第(16)类压缩型映象定义中的距离函数d由满足Φ:X×X→[0,∞)连续和Φ(x,y)=0(?)x=y的函数Φ代替时,张石生论文中的结果仍然成立.从而推广了该文的结果.     

关于平面向量、不等式的模拟测试题

一、选择题(每小题5分,共50分)1.下列结论正确的是A.当x>0且x≠1时,lgx 1≥2lgx B.当x≥2时,x 的最小值为21x C.当x>0时,#x 1≥2#x D.当00的解集是(A.-∞,1)(2(-∞,)∪(0,12)B.0(C.1,∞) D.0,1)(223.函数y=f x)的图像按向量a=((π,2)平     

关于分布函数的一个性质

分布函数的尾性质被许多文献研究过,本文证明了如下尾性质:设是一非负随机变量,F(x)=P[X0,![exp(aX)]<∞则limx→∞1-F(x)∫[u>x]F(du)]=∞     

Brown运动的两种局部时之间的关系

Brown运动是一个具有连续时间参数和连续状态空间的随机过程,有两种不同定义下的局部时,一种是P.Levy提出的“mesure du voisinage”的概念,也即Brown运动{Wt,Ft}t≥0的局部时Lt(x)=limε→01/4εmeas{0≤s≤t;|Wt-x|≤ε},t∈[0,∞),(A) x∈R.另一种是由游程理论定义的局部时lt(x),并给出这两种局部时之间的关系Lt(0)=(√)2/4lt(0).     

非整数阶动态系统的频域辨识方法

提出了2种非整数阶系统辨识方法——广义Levy法和加权迭代法.首先,将辨识整数阶系统的Levy法进行推广得到了适合非整数阶系统辨识的广义Levy法;然后,针对广义Levy法的不足,提出了一种加权迭代法.结果表明:对于非整数阶系统,采用所提出的方法能够得到更好的频域响应拟合;对于整数阶系统,采用该方法,运用阶数扫描仍然能找到拟合其频域响应的最好的整数阶模型;与整数阶系统辨识算法相比,所提出的的系统辨识算法更稳定.     

二阶中立型差分方程的非振动解的存在性

讨论二阶中立型差分方程Δ2(xn cxn-τ) pnf(xn-σ)=0,n∈N(n0).利用Kranoselskii不动点定理,得到方程非振动解存在性的充分条件,推广了相关结果.     

Banach火柴问题的进一步推广

将Banach问题中的2盒火柴根数不等的情形推广到任意m盒的情形,进而将两盒火柴的根数为独立同分布的随机变量情形推广到任意m盒的情形,同时得到相应的一些结果。     

Infusing Multicultural Education: A Process of Creating Organizational Change at the College Level

Organizational change directed at infusing multicultural education into an institutional unit such as a college requires attention to the organizational culture of that unit. The authors use the concept of second-order organizational change (Levy & Merry, 1986) as a way to conceptualize the nature of the change associated with infusing multicultural education within a large College of Education. The authors describe a four-year process of organizational change in which qualitative changes to the organization's culture occured in support of multicultural education. Key elements of change include the values and norms that support organizational policies and practices. Lessons learned are included.     

A test for the differences between two groups' T-distributed statistics

Researchers occasionally perform a statistical test for gains on two groups separately, and compare the results via significance for the two tests. While that procedure is incorrect statistically, there is a statistical test due to Ghosh (1975) that allows comparison of the difference between two independent t-distributed variables. It is presented here with a reanalysis of an incorrect result presented by Levy (1982).     

Digital Module 11: Bayesian Psychometric Modeling https://ncme.elevate.commpartners.com

In this digital ITEMS module, Dr. Roy Levy describes Bayesian approaches to psychometric modeling. He discusses how Bayesian inference is a mechanism for reasoning in a probability-modeling framework and is well-suited to core problems in educational measurement: reasoning from student performances on an assessment to make inferences about their capabilities more broadly conceived, as well as fitting models to characterize the psychometric properties of tasks. The approach is first developed in the context of estimating a mean and variance of a normal distribution before turning to the context of unidimensional item response theory (IRT) models for dichotomously scored data. Dr. Levy illustrates the process of fitting Bayesian models using the JAGS software facilitated through the R statistical environment. The module is designed to be relevant for students, researchers, and data scientists in various disciplines such as education, psychology, sociology, political science, business, health, and other social sciences. It contains audio-narrated slides, diagnostic quiz questions, and data-based activities with video solutions as well as curated resources and a glossary.     

利用吸引盆证明Hardamard-Levy定理

在局部同胚的条件下，Hardamard-Levy定理给出数值连续法可行性的条件。文章利用吸引盆为工具，推广了在Banach空间判定全局同胚的条件，并以此为基础，给出了Hardamard-Levy定理的一种新的证明。     

Principal component analysis using neural network

The authors present their analysis of the differential equation dX(t)/dt=AX(t)-XT(t)BX(t)X(t), where A is an unsymmetrical real matrix, B is a positive definite symmetric real matrix, X∈Rn; showing that the equation characterizes a class of continuous type full-feedback artificial neural network; We give the analytic expression of the solution; discuss its asymptotic behavior; and finally present the result showing that, in almost all cases, one and only one of following cases is true. 1. For any initial value X0∈Rn, the solution approximates asymptotically to zero vector. In this case, the real part of each eigenvalue of A is non-positive. 2. For any initial value X0 outside a proper subspace of Rn, the solution approximates asymptotically to a nontrivial constant vector (X0). In this case, the eigenvalue of A with maximal real part is the positive number λ=‖(X0)‖2B and (X0) is the corresponding eigenvector. 3. For any initial value X0 outside a proper subspace of Rn, the solution approximates asymptotically to a non-constant periodic function (X0,t). Then the eigenvalues of A with maximal real part is a pair of conjugate complex numbers which can be computed.     

汉代选官征辟制度考述

征辟制度作为汉代主要选官方式之一,是适应当时制度环境发展需要特别是选官方式超越与创新的产物,有着较为独特的内涵与品性、严格的标准和资格限定以及不可或缺的考铨机制。征辟制开创了我国古代选官制度的新途径,是历史的进步。就其本质而言,征辟制只是封建专制制度下无法消除的一种特权现象,至汉末已经不符合人才选拔和社会发展的规律。     

伴随分解的聚集交换过程动力学行为研究

这篇文章研究了具有单纯分解-聚集过程,从平均场理论出发,建立相应的Smolu-chowski速率方程,通过理论计算进行求解,进而讨论各影响机制对聚集集团演化行为的作用,以及长时近似下待分解集团的动力学演化行为的规律。结果显示系统的动力学行为与分解反应指数v紧密相关,待分解的聚集集团只在v=0时,满足修正后的标度率。     

Family assessment in K‐12 settings: Understanding family systems to provide effective,collaborative services

Professional school counselors, school psychologists, and other professionals working in K‐12 settings have a complex job of meeting the needs of all students. Often, referral to outside counseling is necessary; however, an effective and comprehensive counseling model advocates for school mental health professionals to employ a wide variety of techniques to ensure equitable distribution of services to all students and their families. This article explores using family assessment tools to support both students' academic achievement and their families within a school context. A case study illustrates how a professional school counselor could employ and collaborate with family assessment tools to support the student, family, and school systems. © 2009 Wiley Periodicals, Inc.