共查询到19条相似文献,搜索用时 62 毫秒
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国有股转持是证券市场一项重大的制度改革和创新,将对中国证券市场参与各方产生深远而重大的影响。首先,它会产生投资者的理性预期效应,增强投资者逆周期行为意识,有利于抵制投机氛围,促进市场内在的稳定性;其次,它建立了市场化调控机制必需的微观基础,使调控活动更符合现代市场经济的规律,提高调控的科学性和有效性;最后,在上市公司治理方面,改革不但探索了国有资产所有人缺位的解决办法,而且强化了社保基金作为股东利益代表对上市公司的监督与激励机制,缓解了管理层与股东之间的利益冲突。 相似文献
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HDTMA-沸石的制法和其对水中磷酸盐的去除 总被引:5,自引:0,他引:5
用十六烷基三甲基溴化铵(HDTMA)对浙江某地沸石进行改性,探讨了制备HDTMA-沸石的最佳条件、影响除去水中磷酸盐的因素和除磷机理。试验表明:改性前,天然沸石要用去离子水洗涤三次,在102℃下干燥进行预处理;改性时,改性剂HDTMA的浓度是3g/L,HDTMA和沸石的反应时间为12h,制得的有机沸石自然晾干。碱性条件下,振荡时间为1h,随着改性沸石的用量增加,磷酸盐的去除率升高。除磷机理为:磷酸盐阴离子和HDTMA阳离子在沸石表面形成缔合物沉淀。 相似文献
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网球水平的提高对网球击球的单个技术和动作细节要求很高,网球技术非持拍手是网球各个技术中最基本的、与击球效果有着密切的联系,因此,本研究对网球技术非持拍手的运用进行调查分析,针对已具有一定网球技术基础的学生,将网球技术非持拍手运用于网球教学和训练过程中进行技术分析,为提高教学质量和效果等提供一些可以借鉴的具体思路、依据和方法。 相似文献
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水性环氧树脂通常是一种稳定、分散的系统,由分散在水中的环氧树脂组成.可以是颗粒状的,也可以是胶状的.水性环氧涂料的重要应用之一是水性环氧涂料的制备.水性环氧树脂既保留了传统溶剂型环氧树脂的优点,又具有耐腐蚀、低VOC、低气味、清洗方面比较方便、安全性高等优点. 相似文献
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经国务院批准,财政部、国资委、证监会和社保基金会于今年8月19日联合印发了<境内证券市场转持部分国有股充实全国社会保障基金实施办法>(以下简称<办法>),明确从即日实施.按照<办法>规定,对于首次公开发行上市的公司,需要按一定比例由国有股转为社会保障基金理事会持有.本文对<办法>出台的背景及出台后的实施问题进行了一定的探讨. 相似文献
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本文关注供应链金融发展对商贸企业持现行为的影响,并考虑产权性质在其中的调节作用与产权的异质性,以2011-2020年上市商贸企业的非平衡面板数据进行实证研究,取得的研究结论为:商贸企业的供应链金融发展程度越高,则持现水平越低,供应链金融的发展对企业现金持有的行为呈一定的替代效应;产权性质能够显著地调节供应链金融发展与商... 相似文献
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洗涤剂中磷酸盐对水域的污染危害及防治对策 总被引:1,自引:0,他引:1
通过对洗涤剂中磷酸盐流入江河湖海引起赤潮污染造成巨大经济损失的分析。提出只有通过政府等部门立法洗涤剂禁磷,才是能决磷酸盐污染的最佳方法。并介绍了新型无磷助洗剂层硅是替代三聚磷酸钠的最佳产品。 相似文献
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This study investigates the drivers of customer retention in a liberalizing market. The authors address key retention issues that allow them to contribute to existing retention research in several critical ways. They (1) examine the effects of pricing and mass advertising, (2) account for (new entrants) competitors' actions, (3) investigate the dynamic impact of marketing tactics, and (4) study the proposed relationships in a market recently opened to competition. Using longitudinal data for a sample of 650 mobile phone consumers and a split-population hazard model that accounts for the notion that some customers are never at risk of defection, the authors show that both the focal firm's (incumbent) and the competitors' price and mass advertising exert a significant influence on the probability of terminating an existing incumbent relationship. They find that the relationships between marketing variables and retention are not static but vary over time. Price is generally less effective in the early stages of market liberalization, which suggests that customers become more price sensitive in later stages. Finally, the study findings can have important strategic implications on designing customer management and marketing resource allocation strategies, as well as on providing a competitive regulatory framework in liberalizing markets. 相似文献
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本文通过论述生物活性炭、生物接触氧化、膜生物反应器和生物过滤技术,分析当前生物技术在居民饮用水处理中的应用,并指出相关生物法在未来饮用水处理中的技术研究方向。 相似文献
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This research investigates the loss of flavour during the spray drying of banana-flavoured milk. The effect of encapsulation using gum arabic on the flavour loss compounds was investigated. The changes were investigated using gas chromatography headspace analysis, sensory panels and scanning electron microscopy. Spray drying without encapsulation showed a banana flavour loss of 74% as opposed to 34% with encapsulation. 相似文献
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采用火焰原子吸收分光光度法测定食品添加剂磷酸氢二铵中的铅含量,并对最低检出限、精密度、回收率、扣除背景及酸的控制等方面进行了实验,结果表明具有很好的可行性和实用性。 相似文献
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Product design and marketing mix decisions for segmented markets depend crucially on the correct specification of marketing models used as input to these decisions. With real-world data, the true number of segments in a market is unknown. Current evidence from simulation studies suggests that the accuracy of commonly used criteria for determining the number of segments in a market depends on the usage context, including the type of distribution being used to describe the data, the model specification, and the characteristics of the market. This study investigates via simulation the performance of seven segment retention criteria used with finite mixture regression models for normal data. This is one of the most important analysis contexts in marketing research since regression models are used, for example, in conjoint analysis and market response analysis, yet no previous study in either the marketing or statistics literatures explores the segment retention problem for mixture regression models. The study shows that one criterion, Akaike's Information Criterion (AIC) with a per-parameter penalty factor of 3 (AIC3), is clearly the best criterion to use across a wide variety of model specifications and data configurations, having the highest success rate and producing very low parameter bias. Currently, this criterion is rarely, if ever, used in the marketing literature. 相似文献
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历史上,关于农村土地的制度变革屡经变迁,几经波折期间农村土地开始面临来自社会外部和农民内部的压力,农村土地能否被合理留下开始引起各界关注。在现阶段可以从需求层面、价值层面和心理层面进行农村土地存留困境的分析,从农村人口结构以及农村人口心理进行相关影响因素的探析,并提出农村土地存留和管理的建设性对策和建议。 相似文献