黑龙江省农村劳动力就业的宏观影响因素分析——以状态空间模型为工具

以状态空间模型为工具,研究农村劳动力就业的影响因素,从深层次分析农村劳动力就业发展的长期性、动态性、阶段性和互动性.研究得到,在所有因素之中乡村劳动力人数是长期内影响劳动力就业的主要因素,且始终为正向影响,地区生产总值、农村居民消费水平、农村固定资产投资和农村居民人均纯收入等四个因素均经历了正相关、负相关的波动过程.由此将为人口与经济的健康发展提供理论依据,为政府部门的科学规划和政策调整提供可行性建议,同时对于人口城镇化的有效推进具有重要的现实意义.     

有限域上一类等维码的下界

等维码凭借其在随机线性网络编码中的良好的差错控制得到广泛研究,对于给定维数和最小距离的等维码所含码字的最大个数目前还没有一般性结果.Tuvi Etzion和Alexander Vardy给出了一定等维码所含码字最大个数的上界和下界,首先利用对偶空间构造等维码C(n,M,2k,k),达到了此类码所含码字的下界,然后具体构造了最优等维码C(7,41,4,2).     

基于状态空间模型构建我国固定资产投资的SWI景气指数

从众多经济指标中选取了固定资产投资的先行、一致指标组,利用所选择的指标基于状态空间模型,采用Kalman滤波估计方法得到了固定资产投资的一致和先行SWI景气指数.对一致指数的分析表明,自1998年以来我国固定资产投资经历了蓬勃扩张的投资长周期和两轮振荡波动的投资短周期,从2008年开始在国际金融危机蔓延和我国经济结构调整的大背景下固定资产投资进入相对平稳增长期.通过对先行合成指数的分析,认为"十二五"期间投资将保持稳定增长,出现大起大落的可能性很小.     

具有非倍测度的参数型Marcinkiewicz积分交换子在Hardy空间的有界性

主要证明了由参数型Marcinkiewicz积分M~p和Lipschitz函数b生成的交换子M_b~p的有界性.在M的核满足一定的条件下,证明了M_b~p不仅从Lebesgue空间L~(n/(n-β))(μ)到Hardy空间H~1(μ)有界,而且从Lebesgue空间L~(n/β)(μ)到RBMO(μ)有界.     

Banach空间中无限簇广义集值变分包含

在Banach空间中推广两个集值映射的广义变分包含到无限个集值映射的广义变分包含的情况,利用预解方程和迭代的方法,研究了其解的存在性及其迭代逼近问题.所得结果改进和推广了一些最新的成果.     

Positivity of Fock Toeplitz Operators via the Berezin Transform

This paper deals with the relationship between the positivity of the Fock Toeplitz operators and their Berezin transforms. The author considers the special case of the bounded radial function φ(z) = a + be~(-α|z|~2)+ ce~(-β|z|~2), where a, b, c are real numbers and α, β are positive numbers. For this type of φ, one can choose these parameters such that the Berezin transform of φ is a nonnegative function on the complex plane, but the corresponding Toeplitz operator Tφ is not positive on the Fock space.     

Commutators of Littlewood-Paley Operators on Herz Spaces with Variable Exponent

Let ? ∈ L~2(S~(n-1)) be homogeneous function of degree zero and b be BMO functions. In this paper, we obtain some boundedness of the Littlewood-Paley Operators and their higher-order commutators on Herz spaces with variable exponent.     

An equilibrium version of set-valued Ekeland variational principle and its applications to set-valued vector equilibrium problems

By using Gerstewitz functions, we establish a new equilibrium version of Ekeland variational principle, which improves the related results by weakening both the lower boundedness and the lower semi-continuity of the ob jective bimaps. Applying the new version of Ekeland principle, we obtain some existence theorems on solutions for set-valued vector equilibrium problems, where the most used assumption on compactness of domains is weakened. In the setting of complete metric spaces(Z,d), we present an existence result of solutions for set-valued vector equilibrium problems, which only requires that the domain XZ is countably compact in any Hausdorff topology weaker than that induced by d. When(Z, d) is a Féchet space(i.e., a complete metrizable locally convex space), our existence result only requires that the domain XZ is weakly compact. Furthermore, in the setting of non-compact domains, we deduce several existence theorems on solutions for set-valued vector equilibrium problems,which extend and improve the related known results.     

单位圆中线性微分方程的解

本文研究了线性微分方程$f^{(k)}+A(z)f=0$ 和 $f^{(k)}+A(z)f=F(z)$解的性质,推广了原有的一些结果.     

Dissipative operators and additive perturbations in locally convex spaces

Let be a densely defined operator on a Banach space X. Characterizations of when generates a C₀‐semigroup on X are known. The famous result of Lumer and Phillips states that it is so if and only if is dissipative and is dense in X for some . There exists also a rich amount of Banach space results concerning perturbations of dissipative operators. In a recent paper Tyran–Kamińska provides perturbation criteria of dissipative operators in terms of ergodic properties. These results, and others, are shown to remain valid in the setting of general non–normable locally convex spaces. Applications of the results to concrete examples of operators on function spaces are also presented.