化解国有企业应收账款问题的几种策略

化解国有企业的应收账款可采用债转股、资产置换、代理收款、资产证券化等策略。在具体操作中，各个策略都有一定的优缺点及适用条件。     

基于5R的高校图书馆“迎新季”营销推广模式研究——以东北师范大学图书馆为例

[目的/意义] 分析高校图书馆在新生入学时开展的营销推广活动,提高图书馆资源利用率,建立读者与图书馆之间的长期稳定的互动关系。[方法/过程] 引入5R营销理论,采用网站调研和对比分析法,总结"985工程"高校图书馆的"迎新季"推广活动经验,以东北师范大学图书馆2016年的主题迎新营销推广活动为例,采用数据统计和实证法,对营销推广活动的效果进行分析,探索高校图书馆"迎新季"营销推广新模式。[结果/结论] 在新媒体环境下,高校图书馆推出多种具有针对性的主题营销推广活动,"迎新季"营销推广活动就是高校图书馆读者服务新的尝试与探索,东北师范大学图书馆馆员针对"迎新季"营销推广活动中产生的问题,提出相应的解决办法,为高校图书馆进一步开展个性化、丰富多彩的营销推广活动提供参考与借鉴。     

微型管带式冷凝器的性能实验研究

建立了微型冷凝器测试实验台,在微型管带式冷凝器内进行了制冷剂(R134a)的冷凝实验,获得了空气侧和制冷剂侧流动阻力关系式,并与前人实验结果进行了比较,验证了设计换热量.     

Innovation, regional knowledge spillovers and R&D cooperation

We investigate the impact of knowledge spillovers and R&D cooperation on innovation activities in three German regions. We begin by estimating the knowledge-production function in order to test for interregional difference with regard to the efficiency of innovation activities. In a second step, we analyze the contribution of spillovers from R&D effort of other private firms and of public research institutions to explain these differences. The inclusion of variables for R&D cooperation in the model indicates that R&D cooperation is only of relatively minor importance as a medium for knowledge spillover.     

基于LASSO-LARS的上市公司财务危机预警模型研究

目前,我国企业面临较大的竞争压力与风险。财务风险是影响企业经营的重要因素,故企业需要建立财务危机预警机制,对未来可能发生的风险进行管理和控制。文章从沪深A股市场中选取共80家ST与非ST上市公司的财务指标数据作为样本,运用机器学习LASSO-LARS算法提取样本中的特别变量,并求得特别变量的系数,最终形成上市公司财务危机预警模型,为上市公司决策者提供决策方向。     

R(L)型诱导空间及连通性

用R(L)-值下半连续函数引入了R(L)型诱导空间的概念．讨论了它的一些基本性质．证明了R(L)型诱导空间保持笛卡尔积；(L^x，δ)是连通空间当且仅当其R(L)型诱导空间是连通空间，给出了LF拓扑空间集与R(L)型诱导空间集之间建立的映射和生成映射ω的可交换性．     

Strengthening reinforced concrete beams using prestressed glass fiber-reinforced polymer-Part II:Analytical study

INTRODUCTION When the flexural load-carrying capacities of existing R. C. or P. C. structures are not sufficient for the service loads, structural strengthening becomes necessary. Using steel plates to strengthen concrete members is a traditional method (Raithby, 1980) and is still an important and popular way at the present time. Fiber-reinforced polymer (FRP) sheets and plates have been used recently as an alternative to steel plates for strengthening concrete structures be-cause th…     

What time-series designs may have to offer educational researchers

The promise of time-series designs for educational research and evaluation is reviewed. Ten time-series designs are presented and discussed in the context of threats to internal and external validity. The advantages and disadvantages of various visual and statistical data-analysis techniques are presented. It is argued that time-series research paradigms are useful when researchers (a) wish to involve a single subject in experimental research (individuals as units of analysis) or conduct program-evaluation studies (aggregates as units of analysis), (b) are interested in nearly continuous measurement, (c) cannot meet conventional design and statistical assumptions, or (d) wish to specify individual differences through N = 1 research strategies. It is also suggested that more research endeavors be devoted to combining unique characteristics of time-series research with conventional multi-unit paradigms.     

能量转化与守恒定律的建立

该文介绍了能量转化与守恒定律发现的背景,并以迈耳、亥姆霍兹、焦耳等重要人物为线索,论述了能 量转化与守恒定律的发现过程.     

Expression of TGF-β1 and TGF-β R II in colorectal adenomas of varying stages

To study the function of transforming growth factor β₁ (TGF-β₁) and transforming growth factor-β type II receptor (TGF-βR II) in varying stages of colorectal adenoma during neoplastic transformation, fiftyfive cases of resected colorectal adenomas were examined immunohistochemically. Our results showed that the expression of TGF-β₁ ranged from high to low, with the progression of low-grade to high-grade dysplasia of adenomas to carcinoma. And there was significantly different expression of TGF-β₁ between moderate and high dysplasia adenomas (P<0.05), but no significantly different expression of TGF-β R II was found among varying stages of adenomas. Our results suggested that the quantities of TGF-β₁ secreted by adenoma cells decrease dramatically in moderate to severe dysplasia colorectal adenomas. It is the decreased secretion of TGF-β₁, rather than the mutated TGF-βR II that may play an important role in transforming colorectal adenomas to adenocarcinomas.