整系数多项式不可约判别法

多项式在有理数域上可约的问题可以归结到整系数多项式能否分解成次数较低的整系数多项式的乘积的问题．Kronecker和Eisenstein分别给出了整系数多项式在有理数域上是否可约的判别方法，本文给出了另外一个判别整系数多项式不可约的判别法，对Eisenstein判别法予以补充．     

线性方程组求解及应用

文章首先介绍了用克拉默法则求解一类线性方程组(方程的个数与未知量个数相同且系数行列式不为零),由此提出对于一般的线性方程组如何求解问题.从而引出用矩阵的秩来判定线性方程组的解的结构以及用初等变换来求线性方程组的通解.最后应用线性方程组的求解问题对矩阵方程和向量组的线性相关性进行分析.     

二阶变系数线性齐次方程的三个可积充分条件

利用变量代换和凑项的方法,给出了二阶变系数线性齐次方程的三个可积充分条件,并得出求解方程的通解公式.     

Simple groups with orders 2^a3^b5^cp^d, 2^a3^b7^cp^d and 2^a3^b5^c7^d

This work deals with the power exponent r1 and r2 respectively of the maximal and second-maximal prime factors ofthe order of simple K4-group, and the classification for simple {5,7}′-K4-group G (i.e. ｜G｜ can not be divided by 5 nor by 7 or ｜π(G)｜ = 4 ), simple 5′ -K4-group G (i.e. ｜G｜ can not divided by 5 and ｜π(G)｜ =4) and simple 7′-Ea-group G (i.e. ｜G｜ can notdivided by 7 and ｜π(G)｜ =4). It is derived that r1 =1, 2 and 4, and r2 is not greater than 4. All the simple K4-groups with order 2^a3^b5^cp^d, 2^a3^b7^cp^d and 2^a3^b5^c7^d are obtained.     

一类KOLMOGOROV系统的极限环

本文研究了一类kolmogorov生态系统，证明了有关它的极限环的存在性与唯一性的若干定理．     

高阶奇异对称微分算子亏指数与一类方程适定性的关系

建立了偶数阶奇异对称正则微分算子亏指数与一类带边值条件方程解的适定性之间的等价关系，从方程适定性的角度解决了一类微分算子亏指数的判定问题，并将原有的关于极限点型亏指数的判定作为一种特例包含在内。     

具有"积分小"等数的中立型方程的振动性

对于P∈C(犤to,∞),R),Q∈C(犤t0,∞),R ),给出了中立型方程犤x(t)-P(t)x(t-τ)犦(n) Q(t)x(t-σ)=0,的充分条件,改进了已知的结果。     

Modeling the influences of upper-elementary school students’ digital reading literacy,socioeconomic factors,and self-regulated learning strategies

Background: Reading is an interactive and constructive process of making meaning by engaging a variety of materials and sources and by participating in reading communities at school or in daily life.

Aim: The purpose of this study was to explore the factors affecting digital reading literacy among upper-elementary school students.

Method: A 3-stage stratified cluster sampling was implemented that resulted in a sample of 592 upper-elementary students from 29 classes in 7 schools. Self-Regulated Learning Strategies Assessment (S-RLSA), Digital Reading Literacy Assessment (DRLA), and student reports of their parents’ education backgrounds were used to collect data on the outcome and predictor variables. Interpretation of these data involved two highly regarded statistical techniques. First, structural equation modeling was used to explore relationships amongst the constructs. Second, multi-group invariance (MI) analyses were used to assess the influence of parental education and self-regulated learning strategies on students’ digital reading literacy.

Results: Enriching students’ family learning resources and strengthening their self-regulated learning abilities could have very important influences on promoting upper-elementary school students' digital reading literacy -webpage information retrieval, reading and communication abilities.

Conclusions: This study also provides information on how teachers can address student resources to improve digital reading literacy and self-regulated strategies.     

第二类Fredholm积分方程的快速数值解法

对于具有弱奇性核函数的第二类Fredholm积分方程，将核函数所定义的区域分成大小不同的正方形子区域，利用分层插值多项式逼近核函数，由此得到近似矩阵B实现了积分方程的快速数值解法。在最后，对如何提高方案的数值稳定性作简要讨论并给出要讨论并给出数值结果。     

工艺创新机制研究:来自中国汽车企业的实证

现有产品创新研究文献远远多于工艺创新文献,而对于工艺创新机制的研究更为少见。本文结合文献调研、专家访谈和汽车企业工艺实践,构建了汽车企业工艺创新机制理论模型和研究假设,利用结构方程模型对假设进行了检验。研究发现,决策机制对动力机制、组织机制和激励机制有正向作用,但决策机制对企业工艺创新能力没有直接影响;动力机制、组织机制直接影响工艺创新能力,动力机制的作用相对较弱;组织机制对激励机制的正向作用和激励机制对工艺创新能力的正向作用都没有通过检验。本文对丰富工艺创新研究具有重要的学术价值,研究成果有利于促进企业和政府加强对工艺创新重视。