高校家属区物业管理发展探析

随着我国高校的快速发展和体制改革的不断深化,以及高校后勤管理社会化的进一步发展,实行高校有偿物业管理已是社会发展的必然。文章对高校家属区社会化物业管理提出了几点看法,对高校如何进行社会化物业管理有一定的意义。     

计量经济学课程教学应注意的三个问题

计量经济学是经济学类专业中最受重视的几门课程之一。笔者在教学活动中发现,尽管很多学生为学好这门课程花了大量的精力,但在部分问题的理解上还是存在偏误。笔者经过归纳总结,认为在教学过程中不应忽视三个知识点的讲解,即线性与拟合优度的含义、经典假设的作用。     

易地扶贫搬迁对农户收入及收入差距的影响——基于陕南三市1680份农户数据

在2020年农村绝对贫困问题全面消除、相对贫困问题成为未来扶贫工作重心的现实背景下,易地扶贫搬迁作为脱贫攻坚的头号工程,其对农户收入及收入差距的影响亟待研究。本文采用2017年陕南3市1680份农户调研数据,在考虑样本选择偏差的基础上,使用内生转换回归模型和Field分解法,探究了参与易地扶贫搬迁对农户收入及收入差距的影响及作用路径。研究表明：①基于反事实假设,未搬迁农户如果参与易地扶贫搬迁,其家庭总收入将增长2.56%。即易地扶贫搬迁有效提高了农户家庭总收入,且收入增长呈现明显的非农驱动特征。②参与易地扶贫搬迁对降低农户内部收入差距的贡献率为1.56%,其中低收入群体生计策略非农转型程度更高、收入增长幅度更大。③相比于扩大农业收入差距,参与易地扶贫搬迁对缩小非农收入差距的贡献更大,是降低农户内部收入差距的主要作用路径。未来需结合新时代背景继续推进易地扶贫搬迁政策,将盘活迁出地的土地资源和稳就业作为搬迁后续工作的核心。     

Forty years of the International Journal of Information Management: A bibliometric analysis

In 2019, the International Journal of Information Management (IJIM) celebrated its 40th year of publication. This study commemorates this event by presenting a retrospect of the journal. Using a range of bibliometric tools, we find that the journal has grown impressively in terms of publication and citation. The contributions come from all over the world, but the majority are from Europe and the United States. The journal has mostly published empirical articles, with its authors dominantly using quantitative methodology. Further, the culture of collaboration has increased among authors over the years. The journal publishes on a number of including managing information systems, information technologies and their application in business, technology acceptance among consumers, using information systems for decision making, social perspectives on knowledge management, and information research from the social science perspective. Regression analysis reveals that article attributes such as article order, methodology, presence of authors from Europe, number of references, number of keywords, and abstract length have a significant association with the citations. Finally, we find that conceptual and review articles have a positive association with citations.     

Fabrication of hierarchical polycaprolactone/gel scaffolds via combined 3D bioprinting and electrospinning for tissue engineering

It is a severe challenge to construct 3D scaf- folds which hold controllable pore structure and similar morphology of the natural extracellular matrix （ECM）. In this study, a compound technology is proposed by com- bining the 3D bioprinting and electrospinning process to fabricate 3D scaffolds, which are composed by orthogonal array gel microfibers in a grid-like arrangement and inter- calated by a nonwoven structure with randomly distributed polycaprolactone （PCL） nanofibers. Human adipose- derived stem cells （hASCs） are seeded on the hierarchical scaffold and cultured 21 d for in vitro study. The results of cells culturing show that the microfibers structure with controlled pores can allow the easy entrance of cells and the efficient diffusion of nutrients, and the nanofiber webs layered in the scaffold can significantly improve initial cell attachment and proliferation. The present work demon- strates that the hierarchical PCL/gel scaffolds consisting of controllable 3D architecture with interconnected pores and biomimetic nanofiber structures resembling the ECM can be designed and fabricated by the combination of 3D bioprinting and electrospinning to improve biological per- formance in tissue engineering applications.     

高校定位影响因素分析——基于文献视角

通过运用SPSS16.0软件,主要采用层次聚类分析方法,对所检索文献中影响因素出现的频次来判断影响因素的重要程度,进而对我国高校定位影响因素进行分类和比较。分析发现:外部因素对高校定位的影响要比内部因素显著,政策制度因素和物质条件因素对高校定位的影响强于思想观念因素。因此,在高校定位过程中高等院校要在深刻认识自身特色的前提下,把握好高校、政府和社会三者的关系,同时还要高度重视办学理念的核心指导作用。     

古塔变形的观测分析

根据古塔的观测数据,分析古塔倾斜、弯曲和扭曲等变形情况。通过空间平面拟合和多边形重心公式,确定古塔各层的中心位置。以塔尖和底层中心连线的倾斜作为塔身倾斜的度量;以各层中心点连线的平均曲率来衡量古塔的弯曲情况;以拟合平面的投影旋转角度刻画古塔的扭曲程度。在获得变形数据的基础上,利用灰色预测模型对古塔变形趋势进行分析。     

基于逐步回归分析的农副产品加工业影响因素研究

在定性分析影响农副产品加工因素的基础上,建立影响农副产品加工业多元回归模型,运用SPSS18统计软件,对多元回归模型进行逐步回归分析。结果表明,影响农副产品加工业的主要因素为私营工业企业的销售收入、全社会商品零售总额、财政支出额及农产品产值,这些因素对农副产品加工业影响较大,因此,出台支持农副产品加工业政策时,要特别考虑到这些方面。     

八年级学生概念图建构特征研究

通过概念图评估和测验,探讨八年级学生建构概念图的特征,能够很好的反映出学生的学业水平。相比被试概念图制作的概念得分和层级得分,命题得分对学生的科学学业测验成绩有更高的预测效度。通过对学生制作的概念图错误问题的分析,能够反映学生在学习过程中存在的问题,并能有效地指导教师的教学。     

MATLAB曲线拟合工具箱在发动机特性拟合中的应用

文章阐述MATLAB的曲线拟合工具箱（Curve Fitting Toolbox）的交互式图形界面和程序调用两种方式的使用方法,并以某柴油发动机稳态工况下的试验数据绘制万有特性图为例,介绍利用曲线拟合工具箱进行曲面拟合的步骤和方法,并给出关键代码,探讨利用该工具箱改进拟合效果和绘图质量。对拟合结果的数理统计校验表明拟合结果完全符合要求,MATLAB的曲线拟合工具箱为发动机特性的曲面拟合提供更大的便利。