一种改进型声表面波滤波器在接收机中的应用

针对应用于接收机中中心频率为898.144MHz的声表面波滤波器的缺点,提出了一种改进型的滤波器.改进型的声表面波滤波器采用镜像阻抗连接低插损结构,大大改善了幅频特性,提高了选择性和温度稳定性.将其应用到接收机中,经试验验证效果良好.     

交易成本的降低与条件约束下的次优选择：枣庄土地使用权封闭贷款案例

为破鳃中小企业土地确权难题,山东省枣庄市创新推出了土地使用权封闭贷款业务。在运作过程中,政府部门通过推荐申贷企业、还贷周转金等公共服务的提供有效降低了信贷交易成本,为信贷契约的达成创造了条件;而对信贷资金的封闭与冻结符合银行的个体理性,是在确保信贷资金安全条件约束下的次优选择。土地使用权封闭贷款进一步挖掘释放了企业的融资潜能,具有一定的现实意义和市场推广价值。     

中国二线城市房地产业现状及可持续发展研究

无论在西方发达国家还是中国,房地产业都是国民经济的基础性产业、主导性产业和支柱性产业。改革开放以来,我国房地产业以惊人的速度发展,取得了令世人瞩目的成就,但也滋生了许多社会问题和矛盾。时至今日,一线城市的房地产市场已趋近饱和,二线城市正逐渐走上历史的舞台,成为房地产业新一轮发展的主角。与此同时,政府为了遏制房地产业的过快发展,多次制定并出台了调控政策,这些愈发严厉的调控手段给二线城市房地产业腾飞蒙上了一层阴影。本文利用房地产经济学的知识和原理,结合我国二线城市的实际特点,从区位、经济和市场等多个角度分析了二线城市房地产业发展的现状和前景,剖析了产业发展中已经存在的或可能产生的问题和矛盾,并对二线城市房地产业的可持续发展提出了具体的建议。     

超声流量计自诊断技术在天然气计量中的应用

随着超声流量计在天然气计量领域的广泛应用,其自诊断技术也不断得到改进,为流量计现场计量的准确、可靠提供了保障。详细阐述了超声流量计的主要技术指标,以及波形图、增益值、信号质量、信噪比、流速特性等主要自诊断方法,还对声速核查法进行了介绍。有效利用超声流量计的自诊断与维护技术,不仅能确保流量计处于良好的运行状态、准确计量,也可核查计量系统中压力、温度和组分变化。     

宁国市民营企业“二次创业”实现途径研究

在百年一遇的国际金融危机的调整期,唯有在危机中引导企业锐意变革,在管理、文化、体制等方面开拓创新,提高企业经营能力和控制能力,培养核心竞争能力,民营企业才能在危机过后的下一轮发展浪潮中占据优势地位。文章在揭示、剖析宁国民营企业＂二次创业＂存在的困难与挑战的基础上,对其＂二次创业＂的实现途径进行了探究,试图为宁国民营企业指明发展方向。     

大河煤矿区富煤二矿主采煤层对比方法探讨

文章利用生物化石、岩性、岩相标志,煤层夹矸、顶、底板岩性特征以及煤岩层的组合规律、层间距、测井曲线等组合性标志对富煤二矿含煤地层中煤层进行对比,达到判别煤层层位的效果,对矿区生产及周边矿区的勘探、生产工作具有一定的指导意义。     

NO MARGINAL ARBITRAGE OF THE SECOND KIND FOR HIGH PRODUCTION REGIMES IN DISCRETE TIME PRODUCTION–INVESTMENT MODELS WITH PROPORTIONAL TRANSACTION COSTS

We consider a class of production–investment models in discrete time with proportional transaction costs. For linear production functions, we study a natural extension of the no‐arbitrage of the second kind condition introduced by Rásonyi. We show that this condition implies the closedness of the set of attainable claims and is equivalent to the existence of a strictly consistent price system under which the evaluation of future production profits is strictly negative. This allows us to discuss the closedness of the set of terminal wealth in models with nonlinear production, functions which may admit arbitrages of the second kind for low production regimes but not marginally for high production regimes.     

陕西省高等院校第二课堂教育探析

本文从陕西省高校第二课堂建设的实际情况出发,高校第二课堂建设对培养学生创新精神和实践能力及对与实践教学如何有机结合,促进人才培养质量的提高进行了初步探讨。第二课堂教育对陕西省乃至全国高等教育中的现实意义。     

The Emergence of Second‐Tier Auditors in the US: Evidence from Investor Perceptions of Financial Reporting Credibility

We examine changes in the association between auditor type (Big 4, Second‐Tier, and Other non‐Big 4) and perceived financial reporting credibility in the wake of events (e.g., Andersen's failure, the implementation of SOX, creation of the PCAOB, etc.) which led to significant growth in Second‐Tier client portfolios and increased scrutiny of Second‐Tier audit practices. Our results reveal that financial reporting credibility of Second‐Tier clients was lower than that of Big 4 clients and was indistinguishable from that of Other non‐Big 4 clients pre‐Andersen. However, post‐Andersen, we find that financial reporting credibility of Second‐Tier clients is higher than that of Other non‐Big 4 clients and is indistinguishable from that of Big 4 clients. We expect that our results will be of interest to regulators, both in the United States and in the European Union, who have expressed concerns about the current state of competition in the audit market, management and boards of directors that are contemplating switching to a Second‐Tier audit firm, and academics investigating quality differences among audit firm types.     

关于第二类stirling数的几个恒等式的证明

第二类stirling数的计算一般都较为繁琐,文章给出了计算第二类stirling数比较简捷的算法,从而提高了第二类stirling数的计算速度,并由此推出了一个第二类stirling数的恒等式.