中国区域碳减排责任分摊研究——基于共同环境责任视角

区域间碳减排责任分摊,是制定节能减排政策的一大关键难题。为合理确定各区域碳减排责任,基于投入产出方法对中国区域间产品贸易隐含碳排放进行测算,进而按照共同环境责任原则确定各区域碳减排责任比重。在此基础上,将中国2020年减排目标逐年进行区域分摊。研究发现:中国碳排放存在由资源富裕区域向沿海发达地区转移、由沿海向中部区域转移的基本特征;2006—2020年中国累计应减少碳排放量随经济增长速度的提高而增加;中部地区分摊的减排任务最重,京津区域减排任务最轻。为实现总体减排目标,国家应对中部、西北等区域进行财政补贴,鼓励其调整产业和贸易结构,淘汰落后产能,降低碳排放强度;同时,应激励东部沿海区域对能源富裕区域进行资金、技术和人才支持。     

略论淘宝网店的经济运营与策略

以目前国内最大的C2C商务平台淘宝网上个人店铺为研究对象,通过对当前国内电子商务环境和淘宝网店现状的分析,从内在价值体系构建和外部营销策略两个方面对网店运营管理进行了探讨。     

The differential gender effect of internalized racism on abdominal obesity in KwaZulu-Natal,South Africa

This research examined the effect of a psychosocial variable, internalized racism, on abdominal obesity, as measured by waist circumference. Results show that the effect of internalized racism on waist circumference persists net of other controls among women, but not among men. Also, among women who had high levels of internalized racism and high educational levels, a positive relationship to abdominal obesity is evident despite the tendency of education to be protective of abdominal obesity. This study supports other research findings that internalized racism is related to waist circumference among adult women but not among men in Western Hemisphere blacks. It also supports past research findings of a gendered reaction to psychosocial stress. It also illustrates that this relationship occurs on the continent of Africa, an area where research on this phenomenon is scarce.     

转移成本对感知质量与满意之间关系的调节作用——对B2B电子中介买方用户的实证研究

如何提高用户满意,对于为买卖双方提供交易支持服务的B2B电子中介而言,是扩大平台运营规模和增加市场竞争力的基础。本文以B2B电子中介的买方用户为研究对象,建立了基于转移成本调节的感知质量与用户满意因果关系概念模型,借助于国内知名的B2B电子中介采集了覆盖五大洲114个国家的649份样本数据,然后运用无约束方法验证了用户感知质量与满意之间、转移成本与满意之间的正向影响关系,以及转移成本对感知质量和满意之间关系影响的负向调节作用。实证研究结果显示,较高的转移成本会减弱买方用户的感知质量对满意的影响,有利于B2B电子中介提高买方用户的满意水平,进而为B2B电子中介如何从转移成本角度提高买方用户满意提供了实证基础。     

基于评价者过滤的个性化信任模型

信任问题是困扰C2C电子商务发展的重要瓶颈。在传统模型基础上,本文进一步引入5梯度的连续性评分标度、交易次数、多维评分、惩罚因子四项因素,研究两种商品交易历史对卖家信任的影响。为满足个性化选择,创建了评价者过滤机制,在此基础上构建可满足用户需要、防范信用欺诈的个性化信任模型,通过仿真实验验证模型的有效性。     

Techniques For Developing Health Quality of Life Scales for Point of Service Use

Clinical and health policy research frequently involves health status measurement using generic or disease specific instruments. These instruments are generally developed to arrive at several scales, each measuring a distinct domain of health quality of life (HQOL). Clinical settings are starting to explore how to integrate patient perspectives of HQOL outcomes into patient care. However, the length of many HQOL instruments poses a challenge in terms of patient burden, as well as clinic flow time. The most popular paradigm for scale construction utilizes classical test theory methodology and can lead to excessive and redundant items in an effort to bolster reliability measurements such as Cronbach’s alpha above levels of accepted reliability. This paper presents techniques for utilizing item response theory to arrive at single item scales that are diagnostically informative and short enough to have clinical utility. A danger of such dramatic scale reduction is that validity might be compromised. This danger is addressed in terms of criterion related validity and sensitivity to clinical changes over a 36 months period. The reduction methods are illustrated using selected scales from the Arthritis Impact Measurement Scales 2 (AIMS2) with data obtained from the study Pharmaceutical Care Outcomes: The Patient Role (PCOPR).     

甘肃省出生缺陷1：2配对病例对照研究

为了解甘肃省出生缺陷死亡率及易患因素,为“甘肃省出生缺陷干预工程”项目的实施提供可干预的核心因素。根据甘肃地理特点及经济状况,按随机分层整群抽样方法,抽取了4个县,共42个乡为调查点。结果显示四县市婴儿总死亡率15.8‰(98例),出生缺陷死亡率7.7‰。甘肃省出生缺陷前五位的致病因素依次为:母亲孕早期接触农药史;母亲孕前一月服药史;母亲孕期接触农药史;母亲孕早期感染史;既往流产史。     

ZrO_2对介孔CuO/CeO_2催化剂催化富氢气体中优先氧化CO反应的影响

采用溶胶-凝胶法合成介孔CeO2-ZrO2复合载体、浸渍法负载CuO制备出介孔12%CuO/CeO2-ZrO2催化剂,将其应用于富氢气体中CO的优先氧化反应。通过BET、XRD、TPR等技术表征,考察了12%CuO/CeO2-ZrO2催化剂的结构性质。活性评价结果表明,添加10%ZrO2催化剂的CO优先氧化性能良好,氧化活性高低与ZrO2的含量有关。     

中国能源消费的CO_2排放变动及其驱动因素分析

结合中国CO2排放的现状,运用改善的因素分解方法,就中国CO2排放变动的影响因素进行定性与定量的分析,研究结果认为：经济增长是促进能耗增长与CO2排放逐年增长的主导因素,而且这一作用还呈逐年增长的发展趋势;能源结构调整并未起到节能减排的作用,以煤为主的能源结构是导致CO2排放快速增长的原因之一;技术进步与产业结构调整是实现节能减排目标的主要因素。其中,能源技术进步减排效应最大。2020年减排目标的实现,关键在于推动节能技术进步,淘汰落后产能,推动重点领域节能减排;重点是控制煤炭消费的快速增长,以及能源结构与产业结构的双重优化。     

相位旋转的速率为2的空时分组码

速率为2的空时分组码(R2-STBC)能达到全速率全分集,然而其译码复杂度与调制阶数的平方成正比。为了降低译码复杂度,提出了一种基于相位旋转的、速率为2的空时分组码(PR-R2-STBC),发送端根据反馈信息将部分发送信号旋转一定的角度,实现了信号在传输过程中两两正交,从而使得其译码复杂度与调制阶数成正比。仿真结果显示,与R2-STBC相比,该编码仅需反馈7 bit就极大地降低了译码复杂度。