气候变化与生命能

通过分析生命能与气候变化之间的相互关系．探讨了气候要素：气温、降水对人类生存能力——生命能的影响。     

基于回归方程的流通企业破产风险模型

流通企业与生产企业所处行业性质的差异,决定了其与生产企业破产风险的差异。对企业破产风险的估计,目前流行两种模型:一种是F.Lundberg提出的专门研究保险企业破产风险的古典模型,另一种是A ltm an提出的Z值模型。该两种模型预测企业破产风险非常有效,但它们只预测经济学意义上的企业破产风险。法律意义上的破产风险不同于经济学意义上的破产风险,它的影响因素取决于国家法律的规定。中国破产法规定企业破产的原因有两个:支付不能和资不抵债。本文以此为依据,提出了法律意义上的流通企业破产风险回归模型,并对其进行了检验,最后对与模型相关的问题和改良思路进行了介绍。     

城乡结合部未成年人犯罪原因及对策分析

城乡结合部因其人员构成的多元性以及环境的复杂性,使该区域成为关注的焦点.而生活在该环境之下的未成年人的健康成也就成为不容忽视的问题.调查显示,城乡结合部的未成年人犯罪现象呈上升趋势.本文从城乡结合部未成年人犯罪的定义和特点两个方面进行论述,并以此为基础分析了城乡结合部未成年人犯罪的原因.     

潍坊青萝卜上粉虱类的发生及防治

本文介绍了目前严重危害潍坊青萝卜的粉虱种类,发生规律及其危害情况,分析了其重发原因,并结合潍坊当地的实际情况提出了几种切实可行的防治措施.     

浅谈DK77系列数控线切割机床断丝原因及对策

近年来数控线切割机床已经在模具加工生产中得到广泛的应用。然而 ,在生产过程中经常出现的断丝故障 ,影响着厂家的生产效率和经济效益。该文结合DK77系列数控线切割机床的结构原理和笔者的工作经验 ,分析总结其断丝故障的原因及对策。     

榛属内种的分布与气候因子关系的研究

在我国整个榛属分布区内机械布设52个样区，以榛属在各区内分布的种数得分及对应的环境气候指标，对榛属内种的分布与气候因子的关系进行了定量研究，获得了数学模型．结果表明：榛属内种的分布受气候因子的综合作用，其主导因子为降水量，是紧密负相关；其次为温度，呈弱的正相关．据此认为，在榛子的引种工作中首先应重点考虑的气候因子是引种区环境的湿润状况，其次是温度。     

建筑物沉降裂缝产生的原因及防治措施

沉降裂缝是1个普遍存在且难以解决的工程问题，本文着重分析裂缝形成原因，提出设计和施工2个阶段的预防措施，以及裂缝的治理方法。     

天然色素的变质原因及其提取应用中应注意的问题

通过分析天然色素的变质原因，提出了天然色素在提取和应用中应注意的一些问题．     

Reflection of the Neogene–Quaternary phylogeography in the recent distribution limiting climatic factors of eight Mediterranean Phlebotomus species (Diptera: Psychodidae)

The diversification of Mediterranean Phlebotomus species occurred during the Neogene and Quaternary periods. The climatic and geographical history of the Mediterranean area plausibly influenced the climatic requirements of recent sand fly species. Our aim was to investigate the European zoogeography and the climate-based ecological groups of eight Phlebotomus species considering the phylogeography of the studied taxa. Jaccard index calculation, hierarchical cluster and principal component analyses were performed. The results of Jaccard-coefficient calculations may indirectly refer to the former existence of three possible glacial refuges of sand fly populations in Europe: an Iberian, an Apennine and a Balkan Peninsula–Asia Minor refuge. Three main climatic groups of the studied sand fly species were distinguished, namely the so-called ‘Trans-Mediterranean’, ‘East Mediterranean’ and ‘West Mediterranean’ groups. Our results suggest that the ancestor of Phlebotomus similis and Phlebotomus sergenti was adapted to the hot, dry summer Mediterranean climate during the late Neogene. The third member of this climate group, Phlebotomus papatasi because of co-adaptation shows similar climatic requirements as P. similis and P. sergenti. The five Larroussius species studied should have evolved under moister climatic conditions. Species of the ‘West Mediterranean’ group were adapted to the milder and wetter oceanic climate of Atlantic coasts. The species of the ‘East Mediterranean’ group diversified under the less balanced climate of the East Mediterranean. The recent climatic requirements and the European distribution of the studied species is the consequence of the complex Quaternary–Neogene geographical and climatic history of their former habitats in the Old continent. The adaptation of the ancestors of the studied sand fly species to the changing geographical and climatic factors of Europe are discussed.     

公关危机环境下有效实施危机营销

企业生存在一个充满危机的市场环境中,稍不注意就会陷入经营困境。近年来公关危机事件层出不穷,由此危机营销越来越受到重视,建立完善的危机营销体系迫在眉睫。本文首先明确了进行危机营销的必要性,其次分析了产生危机的原因,最终根据控制理论将危机管理划分为三个环节即前期控制、同期管理、反馈控制,并指出了各管理环节的措施方法。力求帮助企业有效实施危机营销,最大程度的减少损失,维护企业形象。