现代经济增长理论研究的一个文献综述     

陈凯席晶  雷钦礼 《未来与发展》2014,(1):18-23,79

经济增长一直以来都是经济研究的核心课题之一．经济增长涉及的领域众多,然而长期以来对经济增长的主流研究主要集中在生产技术方面．忽略了其他因素的影响。近些年来,经济学家逐渐认识到其他因素的重要性．因而对经济增长的研究也开始呈现出百家争鸣、百花齐放,分别从不同角度、不同方向上研究经济增长．本文则是对这些新发展的一个文献梳理。  相似文献   

基于区域差异视角的江苏省城乡收入差距研究     

王静 《未来与发展》2014,(7):105-108

本文以存在梯度区域发展差异的江苏省2000-2012年的相关数据为基础,研究了经济增长、人力资本、财政支出及农业税改革等因素对城乡收入差距的影响。研究发现：各因素对江苏省区域城乡收入的影响存在差异性,除经济增长与城乡收入分配呈现倒“U”型特征的共性外,不同区域人力资本、财政支出及农业税改革与城乡收入差距呈现较为复杂的关系。文章最后对差异性结果产生的原因进行了探索性解释。  相似文献   

软科学研究成果信息共享的优化与提升对策研究——以山东省为例     

丁其涛  陈娜  胡一桐  庞增东  梁帅 《科学与管理》2014,(2):77-80

本文立足山东实际,通过分析国内外及山东省软科学研究成果信息共享的现状,总结我省软科学研究成果共享的现有模式经验、找出存在的主要问题,提出优化提升我省成果信息共享模式的对策建议,进一步推进软科学决策的科学化和民主化。  相似文献   

The construction of an interfacial valve-based microfluidic chip for thermotaxis evaluation of human sperm     

Zhuoqi Li  Weiran Liu  Tian Qiu  Lan Xie  Weixing Chen  Ran Liu  Ying Lu  Keith Mitchelson  Jundong Wang  Jie Qiao  Jing Cheng 《Biomicrofluidics》2014,8(2)

Thermotaxis has been demonstrated to be an important criterion for sperm evaluation, yet clinical assessment of thermotaxis capacity is currently lacking. In this article, the on-chip thermotaxis evaluation of human sperm is presented for the first time using an interfacial valve-facilitated microfluidic device. The temperature gradient was established and accurately controlled by an external temperature gradient control system. The temperature gradient responsive sperm population was enriched into one of the branch channels with higher temperature setting and the non-responsive ones were evenly distributed into the two branch channels. We employed air-liquid interfacial valves to ensure stable isolation of the two branches, facilitating convenient manipulation of the entrapped sperm. With this device, thermotactic responses were observed in 5.7%-10.6% of the motile sperm moving through four temperature ranges (34.0-35.3 °C, 35.0-36.3 °C, 36.0-37.3 °C, and 37.0-38.3 °C, respectively). In conclusion, we have developed a new method for high throughput clinical evaluation of sperm thermotaxis and this method may allow other researchers to derive better IVF procedure.  相似文献   

Solution pH change in non-uniform alternating current electric fields at frequencies above the electrode charging frequency     

Ran An  Katherine Massa  David O. Wipf  Adrienne R. Minerick 《Biomicrofluidics》2014,8(6)

AC Faradaic reactions have been reported as a mechanism inducing non-ideal phenomena such as flow reversal and cell deformation in electrokinetic microfluidic systems. Prior published work described experiments in parallel electrode arrays below the electrode charging frequency (f_c), the frequency for electrical double layer charging at the electrode. However, 2D spatially non-uniform AC electric fields are required for applications such as in plane AC electroosmosis, AC electrothermal pumps, and dielectrophoresis. Many microscale experimental applications utilize AC frequencies around or above f_c. In this work, a pH sensitive fluorescein sodium salt dye was used to detect [H⁺] as an indicator of Faradaic reactions in aqueous solutions within non-uniform AC electric fields. Comparison experiments with (a) parallel (2D uniform fields) electrodes and (b) organic media were employed to deduce the electrode charging mechanism at 5 kHz (1.5f_c). Time dependency analysis illustrated that Faradaic reactions exist above the theoretically predicted electrode charging frequency. Spatial analysis showed [H⁺] varied spatially due to electric field non-uniformities and local pH changed at length scales greater than 50 μm away from the electrode surface. Thus, non-uniform AC fields yielded spatially varied pH gradients as a direct consequence of ion path length differences while uniform fields did not yield pH gradients; the latter is consistent with prior published data. Frequency dependence was examined from 5 kHz to 12 kHz at 5.5 V_pp potential, and voltage dependency was explored from 3.5 to 7.5 V_pp at 5 kHz. Results suggest that Faradaic reactions can still proceed within electrochemical systems in the absence of well-established electrical double layers. This work also illustrates that in microfluidic systems, spatial medium variations must be considered as a function of experiment time, initial medium conditions, electric signal potential, frequency, and spatial position.  相似文献   

非英语专业大学生自主学习能力实证研究     

刘晶 《济宁师范专科学校学报》2014,(6):119-122

对济宁学院225名非英语专业大学新生的自主学习能力进行问卷调查,发现他们的英语自主学习能力水平较低,对英语语言和文化的学习有较高的热情,但缺乏计划性和相应的学习策略.对调查结果进行皮尔逊相关分析,发现他们的自主学习能力和高考成绩并不呈现较强的正相关.针对这种现状,尝试提出了一些建议和方法,旨在提高非英语专业大学生的自主学习能力.  相似文献   

“艺术专业技能赛”对舞蹈教学的要求与思考     

方晶 《湖北函授大学学报》2014,(21):112-113

"福建省职业院校技能大赛(高职组)"艺术专业技能(中国舞)赛项,于四月底在福州落下帷幕。这是对高职舞蹈教学的一次检验,通过参与此次大赛的选拔、排练、比赛和观摩学习,分析存在的问题,对日常的教学和训练提出要求,并从教学思路、舞蹈体验、舞台实践三个方面探讨实施教学的策略。  相似文献   

我国冰雪运动产业政策演进特征及展望     

刘建明  米靖  金乃婧  刘金钟 《体育文化导刊》2022,(2)

运用文献资料、专家访谈、文本分析等方法,分析我国冰雪运动产业政策演进特征,并提出展望。冰雪运动产业政策经历了初创与曲折期、起步期、探索期、黄金期4个演进阶段,呈现出政策目标定位逐渐清晰化、政策主体逐渐多元化、政策工具类型更具均衡性、政策执行监管机制逐步健全的特征。未来我国冰雪运动产业政策制定应细化政策目标,强化目标适切性;加大跨部门协同合作,明确权责主体;丰富政策工具,提升决策效果;加快构建政策执行监管体系,调控执行效果。  相似文献   

税基还是税率？不同税收激励与企业研发创新     

贺娜  李香菊 《科研管理》2022,43(9):76-82

   创新的公共产品特性和金融市场失灵是影响企业研发创新的两个重要因素,前者可通过税收激励来调节,而后者产生的主要原因是融资约束。本文基于2010—2017年沪深两市A股上市公司数据,从融资约束视角采用双固定效应模型、动态回归模型、负二项回归模型等方法研究了税收激励对企业研发创新的影响。结果表明：税收激励对研发投入强度具有正向促进效应,而且税基优惠的促进效应大于税率优惠,但税收激励对研发创新质量的促进效应不足。融资约束对研发投入强度影响显著为负,税收激励可通过缓解融资约束提高研发投入强度,其中税基优惠主要有利于缓解内部融资约束,税率优惠更有助于缓解外部融资约束。文章最后提出应关注每项税收激励政策有效性、提升创新质量等建议。  相似文献   

双元、悖论式领导对绩效的影响     

尹奎支前闯  代向阳李培凯 钱婧 《科研管理》2022,43(8):165-173

   组织发展面临的张力越来越普遍,双元领导、悖论式领导日益引起理论界关注。然而双元领导、悖论式领导与创新绩效、任务绩效之间的关系如何？两种领导行为对两种绩效的影响是否存在差异？两种领导行为对创新绩效的影响是否会受到领导者层级的影响？上述问题亟待解答。对50项研究共13 232个样本进行元分析,分析结果发现：双元领导、悖论式领导分别对创新绩效、任务绩效有正向影响;双元领导、悖论式领导对创新绩效、任务绩效的影响不存在显著差异;双元领导、悖论式领导对创新绩效的影响不受领导者层级的调节作用。研究证实了两种相近领导行为影响不存在差异,为未来研究中的变量选择提供了依据,对实践中不同层级领导力开发提供了启示。  相似文献