14 research outputs found
Supply Chain Status, Firm Performances and Stock Returns: Evidence from A-Share Listed Firms in China
面临着竞争日益激烈和市场环境复杂多变的生存与发展格局,企业往往会依靠自身的要素禀赋将资源配置能力拓展至上下游供应链中,使得企业与企业之间的竞争已经转变为供应链与供应链之间的竞争。企业供应链地位及其经济后果已经成为近年来理论与实务界研究的热点。阐明企业供应链地位带来的经济后果对推动企业综合平衡自身在供应链中的地位、实现企业价值最大化具有重要的理论与现实意义。然而,已有研究却局限于静态的竞合关系,仅对企业上游或下游集中度进行探讨,研究范畴狭窄。鉴于此,本文将研究聚焦于企业供应链地位对企业财务、运营,成长、市值、股票收益率等的影响。全文分为七章,各章主要内容如下: 第一章为引言,阐明了研究的主要问...With thedevelopment of fierce competition and complex market environment, enterprises tend to rely on their own factor endowment to expand the allocation of resources to suppliers and customers, making the competition among enterprises evolved into competition among supply chains. Supply chain status and its economic consequences have become a hot issue that lead to concern in theoretical and prac...学位:管理学硕士院系专业:管理学院_财务学学号:3212014115066
Nutrient requirements and development of formulated diets of mud crab,Scylla sp.
【中文摘要】 青蟹属(Scylla)有锯缘青蟹(Scylla serrata),拟穴青蟹(S.paramamosain),紫螯青蟹(S.tranquebarica)和榄绿青蟹(S.olivacea)等4个种。我国以拟穴青蟹占绝对优势,它有个体大、生长快、适应性强、肉味鲜美、营养丰富等特点,已成为具有重要经济价值的海水养殖蟹类之一。随着青蟹人工育苗技术的突破、养殖技术的改进和多种养蟹形式的开发,养蟹业得到了蓬勃发展,其养殖规模不断扩大,产量不断提高,据统计,2004年全国青蟹养殖产量已达10.85万吨。养蟹产业的形成和持续发展必然要走健康养殖的道路,而健康养殖除了供应高质量苗种和保持良好的养殖环境外,必须供应量足质优的饲料,以满足青蟹的营养需求。然而,尽管我国青蟹养殖已有100多年的历史,但对其营养需求研究和配合饲料研发起步较晚,国外的相关研究也较少,故目前市场上尚未生产出能满足其正常生长发育所需营养需求的配合饲料,养蟹所用的饲料主要是天然低质鱼、虾、贝类等。鲜杂鱼等天然生物饵料资源有限,供应不稳定,使用不方便(需要冷冻保存),营养不全面,自身携带病原菌,且投喂后容易腐烂分解,败坏水质,易导致病害蔓延,难以满足日益扩大的养蟹...
【英文摘要】 The mud crab,Scylla sp.,is an important crustacean species farmed on a commercial scale in China.They are polycultured with fish or shrimp,but mud crabs are now monocultured in increasing density to supply the growing market.This trend has made diet development more important.Information on the nutrients required for growth of mud crabs is vital for the formulation of an effective feed.This paper reviews the current knowledge on Scylla sp.nutrition with special reference to developments during the last deca...国家“八六三”计划项目(2002AA603013); 厦门大学高层次人才引进科研启动项目; 厦门大学“九八五”计划科技创新项目“青蟹亲体脂肪酸营养与幼体发育关系研究
Are Analysts Inclined to Follow Up Corporations with Good Social Responsibility Performance?
本文以2008年-2010年沪深上市公司为样本,运用短面板数据以及个体和时间双向固定效应模型,实证检验了分析师跟进与企业社会责任表现之间的关系。研究发现(1)企业社会责任表现对分析师跟进程度具有正向影响,且这种影响具有滞后性;(2)高公司治理水平能够增强社会责任表现对分析师跟进程度的正向影响。研究结果为推动企业积极履行社会责任、优化公司治理结构和引入社会责任报告第三方鉴证指引了方向。Using a sample of listed companies in SSE and SZSE for the period 2008-2010, this paper introduces short panel data and two-way fixed effects model to test the relationship between analyst follow-up and the performance of corporate social responsibility(CSR).We find that CSR performance has a positive impact on analyst follow-up, however such impact is a little lagged.We also find that high level of corporate gov-ernance can enhance the positive relationship between analyst follow-up and CSR performance.The results indicate that corporations should fulfill their social responsibilities, optimize the corporate governance structure and introduce the independent third parties to attest the social responsibili-ty reports.国家自然科学基金项目“全球金融风暴背景下中国企业财务决策行为研究”(批准号70972110)的资
天津国际大学生龙舟赛运动员心理状态的分析研究
民族传统体育龙舟运动员的心理状态,是指心理活动在一定的时间内的特征,竞赛中的成功与失败息息相关。评价运动员的心理状态,有助于教练的合理安排赛前实施的专门化心理训练与调节,有效地控制运动员技术、战术、心理竞技水平和身体潜能充分发挥。本文通过观摩2005年天津国际大学生龙舟邀请赛以及结合多年训练女子龙舟运动队参加国内国际龙舟竞赛的研究实践,运用运动心理训练的归因理论,探讨龙舟运动员心理状态与竞赛成绩
小儿癫痫治疗前后脑细胞葡萄糖代谢改变及临床价值研究
[目的] 探讨小儿癫痫治疗前后脑细胞葡萄糖代谢改变与临床关系。[方法] 对22例临床确诊为癫痫患儿在治疗前后癫痫发作间期各查一次18F-FDG正电子发射计算机断层扫描(PET)脑显像,同时查EEG、PET与EEG检查相隔时间在两周以内。根据癫痫发作类型,常规使用一线抗癫痫药一种或两种,统计学配对设计符合秩和检验。[结果] 治疗前后小儿癫痫发作间期18F-FDG PET显像有显著差异(P<0.005)。治疗前检查22例,有20例结果为脑葡萄糖低代谢异常,表现为弥漫性低代谢灶11例,单侧低代谢灶9例,正常2例,经过2年以上治疗,复查:无变化3例(其中原正常2例,异常1例),7例由原来异常转为正常(正常率59.9%),较前好转11例(好转率50%),加重2例。脑电图结果显示,治疗前后差异有统计学意义(P<0.005)。22例异常脑电图中,经治疗后,正常2例,好转18例,加重2例,治疗后PET与脑电图结果一致性比较显示,完全一致的改善11例,加重2例,正常2例。完全不一致的改善5例,正常2例。[结论]小儿癫痫脑细胞葡萄糖代谢变化与临床发作轻重有相关性。18F-FDG PET脑显像对预测癫痫愈后及评估脑损伤程度有重要临床价值
Comparative studies on the intermediate rearing of the seeds(Scylla paramamosain﹠Scylla serreta) in outdoor pool with the net cages
在水温25~27℃、盐度13~16、PH值7.5~8.5、连续充气的条件下,以PVC管和筛绢网制成的网箱进行拟穴青蟹(Ⅰ组)和锯缘青蟹(Ⅱ组)两种蟹苗的中间培育。结果表明:网箱培育的拟穴青蟹与锯缘青蟹的蜕壳率分别为47.28%和42.72%,彼此差异显著(P<0.05);死亡率分别为32.88%和42.19%,彼此差异显著(P<0.05)。Ⅰ组、Ⅱ组的增肉系数分别为21.10,14.17;甲长增长率分别为337.25%,304.99%;甲宽增长率分别为275.00%,204.42%。Ⅰ组、Ⅱ组的甲长与甲宽的关系分别为yⅠ=1.6455XⅠ-1.8486,yⅡ=1.7406XⅡ-2.7513;甲宽与体质量的关系分别为WⅠ=0.0264EⅠ0.2818X,WⅡ=0.0308E0Ⅱ.2772X;在本实验条件下青蟹密度为417只/M2时的存活率最高。表明水泥池套养网箱的中间培育模式是可行的。Under the condition of water temperature of 25~27℃,pH of 7.5~8.5,salinity of 13~16 and continuous aeration,the experiment was conducted on two different species of juvenile crabs(Scylla paramamosain,Scylla serrata) with the cages which were made of PVC pipe and silk screen net in pools.The result showed the rates of mortality were Scylla paramamosain( 42.19%) and of Scylla serrata (32.88% ) ; the molting rates were Scylla paramamosain(42.72%) and of Scylla serrata (47.28% ).The weight coefficient were the groups Ⅰ(21.10) and the group Ⅱ(14.17); the increase of carapace length were the groups Ⅰ(337.25%) and the group Ⅱ(304.99%; the increase of carapace width are 275.00%,204.42%,had signification difference(p<0.05).The relationships between the carapace length and width of three groups (Ⅰ,Ⅱ) were yⅠ= 1.6455x -1.8486,yⅡ = 1.7406x -2.7513; the relationships between the carapace width and weight of two groups were wⅠ = 0.0264e0.2818x,w Ⅱ= 0.0308e0.2772x.In conclusion ,under the condition of this experiment ,the density of juvenile crab was 417/ m2 had the highest rate of survival,the model of cultured.crabs with the cages which were made of PVC pipe and silk screen net in pools is feasible.福建省科技计划重点项目(2008X10040);国家高技术研究发展计划863项目(2006AA10A-406)资
荒漠地区公路建设环境保护与生态恢复技术
《荒漠地区公路建设环境保护与生态恢复技术》项目组通过资料收集、理论分析、室内外试验和工程实践,系统开展了荒漠地区公路建设与自然环境相互影响、荒漠地区公路建设的生态环境敏感性、荒漠地区公路建设环境保护与生态恢复技术集成以及典型区域公路建设环保与生态建设示范四方面研究,取得了如下主要创新性成果: 1.分析揭示了荒漠地区公路与环境的相互影响关系,建立了公路建设环境保护与生态恢复的基础平台。 2. 提出了荒漠地区公路路域生态功能重要性、环境敏感性和景观类型区划的原则与方法,建立了相应的区划体系。 3.构建了荒漠地区公路路域生态修复技术评价指标体系和评价数学模型。 4.提出了荒漠..
