电凝聚降氟器降氟改水的实验研究

通过对Ｚ—Ⅰ，Ｚ—Ⅱ型降氟器在沧州市饮用水降氟实验结果的对比研究，发现水的ｐＨ值、反应器的工作电流是制约降氟效果的关键。由于Ｚ—Ⅱ型降氟器对ｐＨ值具有控制作用，所以其降氟效果较好。     

我国冲压模具技术的现状与发展

为了促进我国冲压模具技术的发展,从计算机技术、先进加工技术及装备、其它新技术与冲压模具等方面分析了我国冲压模具的技术现状.结果表明:经过几十年的发展,我国的冲压模具总量位居世界第三位,加工技术装备基本已与世界先进水平同步.以汽车覆盖件为代表的大型、复杂、精密冲压模,用CAD/CAM/CAE软件进行三维设计和模拟,靠高速、精密的加工设备生产,用新型研磨或抛光代替传统的手工研磨抛光,提高模具质量.这些都代表了冲压模具发展的趋势.     

完善我国的政府转移支付制度

我国1994年分税制财政体制的改革,已初步建立了适合当时情况的转移支付制度,但由于经济体制和财政体制的约束,使其存在诸多的不完善、不规范之处。本文通过对我国目前转移支付现状的分析,为我国转移支付制度的完善和发展提出了多种思路和方法。     

论互联网与保险科技结合的重要性

随着互联网科技的快速发展,其影响力已深入市场经济的各个部分,保险行业依托云计算、大数据等互联网科学技术,不断推动自身发展。但在互联网科技时代,互联网保险行业也出现了诸多问题,有必要对这些问题进行探讨,并提出相应的指导策略。     

我国城市建筑垃圾资源化现状及对策研究

随着我国基础设施的大规模建设以及城镇化进程的快速推进,建筑垃圾的产生量日益增多。建筑垃圾资源化作为解决当前环境问题的一种有效途径,对实现资源的优化配置以及经济社会的可持续发展具有重要意义。论文首先阐述了建筑垃圾资源化的基础理论,并采用建筑面积估算法对我国城市建筑垃圾的产生量进行了估算,进而分析了我国建筑垃圾资源化的现状,并提出了实现建筑垃圾资源化的具体对策。     

盾构机自动控制技术现状与展望

随着我国社会主义市场经济的迅速发展以及科技水平的不断提升,交通运输行业得到了蓬勃发展。当前,随着我国地下隧道等各项工程建设数量的不断上升,盾构机的重要性不言而喻。加强对盾构机自动控制技术的研究工作,不断解决该技术应用过程中存在的问题,才能有效地促进技术应用,为提升我国地下工程施工安全性能奠定技术支持。     

Do stock market returns predict changes to output? Evidence from a nonlinear panel data model

Recent empirical work suggests a predictive relationship between stock returns and output growth. We employ quarterly data from a panel of 27 countries to test whether stock returns as useful in predicting growth. Unlike previous research, our approach allows for the possible non-linear effect of recessions on the growth-return relationship. There is strong evidence to suggest that a linear model would be misspecified and provide potentially misleading inference. Using a switching regression approach, we find evidence that returns are most useful in predicting growth when the economy is in recession.First version received: November 2002/Final version received: April 2003This paper benefited greatly from discussions with Kalvinder Shields, Mark Harris, Pete Summers, and Vance Martin. Two anonymous referees provided useful comments on an earlier version of the paper for which we are grateful. The usual disclaimer applies to any errors and omissions. Funding from The University of Melbourne greatly assisted in the completion of this paper.     

我国三农问题的现状及其对策研究

自20世纪90年代后期,三农问题逐渐成为全社会关注的焦点。笔者认为,三农问题的核心是农民问题,而农民问 题的实质是农民的增收问题,一切破解三农问题的措施都应围绕这个中心来进行。为此,应该打破城乡分割的二元格局发展 城市经济,调整国民收入分配格局,支持乡镇企业的发展。     

The Austrian current account deficit: Driven by twin deficits or by intertemporal expenditure allocation?

The evidence presented in the paper rejects the twin deficit hypothesis for the Austrian current account balance during the last two decades. The results are based on an estimate of a vector error correction model including quarterly data for the current account balance and potentially relevant variables driving its dynamics. We compute the variance decomposition of the current account's forecast error and its generalized impulse responses to shocks in the innovations of the system. The results in favor of intertemporal expenditure reallocation cannot be reproduced within a second analysis including the current account and a measure of net output, however. The estimated implicit current account balance, interpreted as the discounted expected change in future net output, does not follow the actual behaviour of the current account. First version received: June 1999/Final version received: March 2001     

浅议我国水产品物流的发展

水产品物流的发展关系到水产业现代化的进程、水产业竞争力的提高和农民收入的增加.本文在明确水产品物流内涵的前提下,重点分析了我国水产品物流的发展现状和面临的问题,并在此基础上,结合实际提出了加快我国水产品物流发展的若干对策.