第三代移动通信系统中用户移动性模型的研究

本文在研究第三代移动通信系统特点和分析UMTS标准模型与可扩展模型的优缺点的基础上，建立了适用于第三代移动通信系统的综合模型，研究和分析了不同类型用户情况下该综合模型的信道占用时间，并给出了仿真结果。     

经济活动中的批判性思维

批判性思维是一种反思性、反省性的思维,是基于一定标准的、合理的、可靠的思维。它适用于人们各个领域的思维活动。在经济活动中运用批判性思维,有助于经济工作者从清晰、正确、可靠的认识出发,客观、全面、深入地分析、思考问题,得出合理的、合乎逻辑的结论。     

Certification and minimum quality standards when some consumers are uninformed

We compare certification to a minimum quality standard (MQS) policy in a duopolistic industry where firms incur quality-dependent fixed costs and only a fraction of consumers observe the quality of the offered goods. Compared to the unregulated outcome, both profits and social welfare would increase if firms could commit to producing a higher quality. An MQS restricts the firms׳ quality choice and leads to less differentiated goods. This fuels competition and may therefore deter entry. A certification policy, which awards firms with a certificate if the quality of their products exceeds some threshold, does not restrict the firms׳ quality choice. In contrast to an MQS, certification may lead to more differentiated goods and higher profits. We find that firms are willing to comply with an ambitious certification standard if the share of informed consumers is small. In that case, certification is more effective from a welfare perspective than a minimum quality standard because it is less detrimental to entry.     

华北地区某污水处理厂升级改造工程实例

华北地区某城市污水处理厂升级改造工程处理规模为50万t/d,原设计为A/O脱氮工艺,执行《城镇污水处理厂污染物排放标准》(GB 18918-2002)二级排放标准。由于近年来进水水质严重恶化以及对污水排放标准的提高,需对原污水处理系统进行改造,通过技术方案对比,在原生物处理段增加厌氧池,使之变为A2/O脱氮除磷,新增深度处理工艺为反硝化生物滤池-加砂沉淀池-滤布滤池-紫外消毒,使出水水质达到一级A排放标准。     

食品安全标准在食品安全管理实践中的运用

食品安全标准是食品安全管理实践工作的活动指南,也是处理食品安全问题的法理依据.当前我国食品安全标准在管理实践工作中仍存在一些问题,影响其执行效率及权威性.本文对食品安全标准的法律地位及有效应用进行概述,并就实践工作中存在的问题进行研究探讨,提出适宜的对策.     

平衡膳食模式视角下粮食需求预测

[目的]随着时代的进步和社会经济的发展,对粮食安全内涵的理解也在逐步深化,粮食安全内涵不仅包括数量方面,还包括营养健康安全,保障居民营养健康成为粮食安全的新时代内涵。基于营养目标的粮食需求研究,建立营养—消费—生产的粮食生产模式,对引导居民合理健康消费和保障粮食安全具有十分重要的意义。[方法]文章首先分析了我国城乡居民营养消费状况,然后基于平衡膳食模式视角,引入标准人消费系数这一概念对我国未来粮食需求进行了更准确的预测。[结果]城镇居民粮食消费已达到高营养目标,但目前农村居民仅达到低营养目标水平,相当于21世纪初的城镇消费水平;考虑人口结构因素,2020年和2030年粮食需求总量分别为4.8亿t和5.6亿t,比没有考虑人口结构变化时分别减少8700万t和2 600万t。[结论]根据分析结果,提出以下几点政策建议:(1)宣传普及营养健康消费知识,引导居民合理膳食;(2)关注人口结构变动,及时调整粮食安全调控机制;(3)优化食品工业的产业机构升级,提高饲料粮转化率。     

企业应对反倾销的会计信息证据效力保障机制理论框架研究

首先阐述了企业应对反倾销会计信息证据效力保障机制的研究意义,明确了该机制研究的理论基础是由一个整合理论框架,以及严谨的概念基础和良好的创新语境等组成。然后,对国内外研究现状进行了动态分析,把国内学者相关研究的新进展和成效,国外经典的研究方法体系和关注企业策略性行为对反倾销的影响,战略性"反倾销管理"理念,作为设计我国企业应对反倾销会计信息证据效力保障机制的借鉴,从企业战略层面及相应的制度配置与协调上,构建了与我国企业应对反倾销相适应的会计信息证据效力保障机制。     

中国自贸区建设现状及其对策研究

近年来,中国加快了自贸区建设的推进速度,截至2019年底,已签订了17个自贸协定。相对而言,中国签订的自贸协定规则覆盖面还比较小、规则标准还比较低。与此同时,以CPTPP、USMCA协定为代表的高标准自贸协定,形成了数字贸易规则、知识产权规则、国有企业规则等多个非传统领域规则。我国应坚持长期宏观战略利益高于短期经济利益、先广覆盖后高标准价值导向和大型新兴经济体与发达经济体自贸谈判并重的原则,从组织上建立直属于最高决策机构的高标准自贸区战略机构、加强对非传统领域议题的整理与研究、建立针对新规则的损益衡量指标体系、健全高标准自贸区谈判的产业受损补偿机制,加快推进我国高标准自贸区建设。     

An empirical examination of capital expenditure in the health sector

This empirical study in the nursing home industry attempts to delineate factors, and thus acquire insights, as to capital expenditures, and address a critical issue regarding governmental reimbursement policy and the economic viability of health care institutions. Combinations of financial performance, financial structure, and institutional context associated with high capital investment nursing homes differ from combinations associated with low capital investment homes. A multivariate analysis of data obtained from 185 nursing homes shows that although there was some difference between the two groups of nursing homes in basic financial and institutional characteristics, only a small subset of the variables were statistically significant discriminators. The hypothesis was then examined within each of the three major nursing home segments—for-profit, not-for-profit, and country homes. Neither financial performance, financial structure, nor institutional context alone is sufficient to explain differences in capital investment behavior. Perhaps more importantly, the extent to which these combination of factors do contribute to explaining capital investment strategies differs within each of the major segments of the industry. Also, these combinations of factors generally differ across the major industry segments as they relate to capital investment strategies.