消癌止痛散对小鼠镇痛作用及对血清β-内啡肽、前列腺素E2水平的影响

目的 探讨消癌止痛散对小鼠的镇痛作用以及对血清β-内啡肽(β-EP)、前列腺素E2(PGE2)水平的影响.方法 选取SPF级的昆明小鼠30只,随机分为空白对照组(面粉)、消癌止痛散(0.4 g/只、0.8 g/只)共3组,每组10只并进行温浴缩尾法镇痛实验;另选取SPF的昆明小鼠24只,随机分为空白对照组(面粉)、模型...     

How Firms’Ownership Structure Impacts Online Peer-to-Peer Lending Performance in China

A dramatic surge in online peer-to-peer(P2P)lending emerged in China,where(under conditions of credit deficiency)it took only three years for the size of the P2P lending market in China to reach four times that of the United States and ten times that of the United Kingdom.The literature indicates that ownership structure is an important factor that influences P2P lending firms’performance,while research on the underlying mechanisms remain insufficient.This study analyzes the data of P2P lending companies between June 2016 and March 2017.The results demonstrate that although ownership structure has minimal direct effect on the turnover volume and number of lenders and borrowers,it moderates the effects of firm age,interest rate,and loan term on firm performance.These results enrich the property theory and shed light on how P2P lending firms with different ownership structures could succeed when there is institutional deficiency.     

B2C电子商务发展策略与服务模式研究

从B2C电子商务发展策略角度可将其分为典型B2C电子商务、平台服务型电子商务和整合型B2C电子商务。从购物返点、购物导购、购物搜索引擎、购物辅助支持等方面可体现不同发展策略下服务模式各自的特征。     

Accounting for human capital externalities with an application to the Nordic countries

Externalities caused by human capital accumulation have taken up considerable space in theoretical work on economic growth. However, less attention has been paid to this externality in traditional growth accounting exercises. This paper takes up the issue of growth accounting, suggesting a framework for quantifying human-capital externalities and illustrating it empirically using data from the five Nordic countries. Four sources of growth are identified, i.e. capital accumulation, labor force growth, and total factor productivity growth (TFP), where the traditional TFP measure is split into a part explained by human-capital formation and an unexplained part. By doing this I am able to attribute between 12 per cent and 33 per cent of growth in the Nordic countries to human capital investment.     

Communication and performance in Bank–Fund joint participation

In this paper I relate Bank–Fund performance to their willingness (or ability) to communicate. I find evidence that a Bank–Fund simultaneous loan is associated to an increase in economic growth and that such effect is diminished by factors preventing full communication, such as the degree of Bank-Fund competition and the salience of informational asymmetries. Politically motivated loans seem—at least to some extent—stimulate more IMF–WB interaction, which turns out to be associated to a better country’s performance.     

The econometrics of the environmental Kuznets curve: an illustration using Australian CO2 emissions

Four econometric issues associated with the estimation and testing of the environmental Kuznets curve (EKC) are considered: (i) model specification with respect to the order of the polynomial, (ii) model specification with respect to the use of linear or log-linear specifications, (iii) integration and cointegration considerations, and (iv) missing variables and time trends. These issues are examined in reference to Australian data on four measures of CO2 emissions and three measures of per capita income. While evidence is provided for an inverted U-shaped EKC, the results cannot be generalized. It is concluded that without the use of sensitivity analysis, the results are typically fragile.     

中国温室气体排放、能源消费与经济增长的实证分析

本文利用时间序列计量经济方法检验了中国的CO2排放量与能源消费、GDP、对外贸易、资本形成、人口等变量之间的关系。研究发现变量之间存在长期的均衡关系。长期内变量之间存在着双向因果关系;而在短期内,存在着GDP、能源消费、对外贸易、资本形成到CO2排放量等四种单向因果关系,其中CO2排放、能源消费、GDP和资本形成在各自的因果关系中所起的作用尤为显著。实证结果也发现能源消费对CO2排放具有加速影响趋势,对外贸易对CO2排放的影响也十分关键,而且变量之间存在着一个稳定的CO2排放方程。相应的政策建议是,中国应该实施低碳经济战略,加快低碳转型,发展低碳经济。     

Navigating a product landscape for technology opportunity analysis: A word2vec approach using an integrated patent-product database

Technology opportunity analysis has been the subject of many prior studies, although most of them have focused on discovering new technology ideas in a single narrow domain. This study proposes a product landscape analysis to identify product areas (i.e., potential technology opportunities) across multiple domains that firms can enter based on the technological capabilities embodied in their existing products. First, text mining is used to construct an integrated patent-product database from the United States patent and trademark database. Second, word2vec is employed to construct a product landscape as a vector space model where products with similar technological bases are located close to each other while maintaining the technological relationships. Third, given a product of interest, potential technology opportunities are identified via (1) automatic opportunity analysis that identifies product areas with technological bases similar to those of the product; and (2) interactive opportunity analysis that finds product areas based on experts’ queries modifying the technological bases of the product (i.e., addition and subtraction). Finally, ten quantitative indexes are developed to explore the implications of the potential technology opportunities identified. The case study covering 3,016,315 patents and 160,832 products confirms that the proposed approach is valuable as a creativity support tool for technology opportunity analysis in the era of convergence.     

精准营销在B2C电子商务中的应用分析

B2C电子商务是消费者与企业利用互联网直接开展交易的一种商业模式,电子商务的蓬勃发展对传统的经营模式形成了巨大挑战,本文主要分析了精准营销在B2C电子商务中的应用现状,探讨了如何利用电子商务提升企业精准营销的效率。     

注CO_2气开发低渗油田影响因素数值模拟研究

本文针对低渗透储层,利用数值模拟方法,研究了渗透率、原油相对密度及非均质性等因素对CO2驱油效果的影响,并且在分析启动压力梯度对低渗透油藏CO2驱替效果的影响基础上,建立了考虑启动压力梯度的CO2驱非达西渗流规律数学模型。根据数值模拟结果,随着渗透率的增加,CO2驱采出程度增大;随着原油相对密度的增加,CO2驱采出程度降低;非均质性性越强,CO2驱采出程度越低;考虑考虑启动压力梯度的影响,建立数学模型,对于低渗透油田CO2驱油实践具有一定指导意义。