缢蛏亲见暂养及人工摧产方法的初步研究     

周学家  刘信艺  贺先明  孙坤言  于惠亭  张常盛 《海洋湖沼通报》1995,(2)

本文根据缢蛏的生态习性和摄食特点等，设计了缢蛏亲贝模拟自然生态暂养方式，与挂笼暂养及底播暂养等进行了比较试验，并对暂养亲贝的性腺发育情况进行了比较观察。结果发现，模拟自然生态暂养蛏成活率明显高于挂笼暂养和底播暂养，且亲贝暂养促熟效果明显。另外，作者对缢蛏的人工催产方法等进行了比较试验，结果发现，阴干──低温处理对缢蛏亲贝具有良好的催产效果，其排卵率可达68％。  相似文献   

The role of international business in clean technology transfer and development     

Ans Kolk 《Climate Policy》2015,15(1):170-176

While research has generated very useful insights, usually at the macro level, regarding the multifaceted nature of environmental innovation and regulation, the characteristics and drivers peculiar to international companies have remained underexposed in the policy-related literature on clean technology transfer and development. This article aims to help open the ‘black box’ of business, also as input for future policy making, by discussing aspects that influence corporate responses: sector-specific and company-specific peculiarities as well as those related to country contexts (both origin countries and host countries for companies). Most of the climate-related investments in ‘developing’ countries turn out to have been geared to a few emerging economies, generally involving established technologies with limited transfer, and a major role for developed-country utilities, particularly from Europe. Despite these limitations, there is a base with experience being built up, and a potential for extension to lesser-developed areas, but that requires market co-creation by joint business and governmental efforts. As viable business models are largely lacking, the article suggests three main modalities, ranging from fully commercial to primarily publicly funded, involving different types of actors and countries. Gearing policies more towards corporate realities and reaping the international momentum of sustainable energy might also further climate goals.  相似文献   

The Decentred Firm and the Adoption of Sustainable Office Space in Sydney,Australia     

Thomas Boyle 《The Australian geographer》2012,43(4):393-410

As the social, ecological and economic benefits of green buildings become more established, firms, especially professional service firms, are responding by adopting sustainable office space (SOS). Accelerating this uptake demands a nuanced appreciation of firms’ understandings of and motivations for adopting SOS. Through a qualitative study of professional service firms in Sydney, this paper brings together a decentred understanding of the contemporary firm drawn from the ‘new economic geographies’ approach and theories of corporate social responsibility to trace and interpret the diverse and overlapping motivations shaping the uptake of SOS amongst these firms. The firm is shown to be a site of plurality and agency, governed by multiple logics. Whilst motivations informed by economic logic remain persuasive and pervasive, the adoption of SOS is simultaneously informed by a wider palette of logics, including environmental and social logics. The paper argues that a decentred conceptualisation of the firm brings the multiplicity of firms’ orientations towards SOS into view and, in so doing, has the potential to inform a politics of intervention for steering firms towards more socially and environmentally sustainable behaviours.  相似文献   

企业文化的战略价值浅析     

罗拱北 《中国勘察设计》2010,(7):72-75

企业文化对企业长期经营业绩有着重要的影响,它很可能成为决定企业兴衰的关键因素,但是直到今天把企业文化发扬光大并成为核心竞争力的企业仍然是极少数。究其原因,主要是理论研究的多,企业家在实践中把企业文化建设当作一种自觉行动的少,没有把企业文化的价值上升到战略高度来加以认识,企业文化缺少核心思想和系统规划,缺乏对企业愿景的描绘,对职工群众缺乏吸引力和凝聚力,以至在市场竞争中难以发挥文化制胜的作用。如何把企业文化培育成一种不可复制的重要战略资源,笔者认为首先要对企业文化进行提炼,找出企业的核心价值观,系统策划企业文化内容,并在员工队伍及客户全体中持续宣贯培育,最终达到员工拥护、客户认同的目标,以文化的软实力为企业创造出硬价值。  相似文献   

The impact of land use change on soil water holding capacity and river flow modelling in the Nakambe River, Burkina-Faso   总被引：3，自引：0，他引：3  

Gil Mahe  Jean-Emmanuel Paturel  Eric Servat  Declan Conway  Alain Dezetter 《Journal of Hydrology》2005,300(1-4):33-43

The annual hydrological regime of the Nakambe River shows substantial changes during the period 1955–1998 with a shift occurring around 1970. From 1970 to the mid-1990s, despite a reduction in rainfall and an increase in the number of dams in the basin, average runoff and maximum daily discharges increased. This paper reviews the hydrological behaviour of the Nakambe River from 1955 to 1998 and examines the potential role of land use change on soil water holding capacity (WHC) in producing the counter-intuitive change in runoff observed after 1970. We compare the results of two monthly hydrological models using different rainfall, potential evapotranspiration and WHC data sets. Model simulations with soil WHC values modified over time based upon historical maps of land use, are compared against simulations with a constant value for WHC. The extent of natural vegetation declined from 43 to 13% of the total basin area between 1965 and 1995, whilst the cultivated areas increased from 53 to 76% and the area of bare soil nearly tripled from 4 to 11%. The total reduction in WHC is estimated to range from 33 to 62% depending on the method used, either considering that the WHC values given by the FAO stand for the environmental situation in 1965 or before. There is a marked improvement in river flow simulation using the time-varying values of soil WHC. The paper ends with a discussion of the role of other factors such as surface runoff processes and groundwater trends in explaining the hydrological behaviour of the Nakambe River.  相似文献   

Sustainability,corporate growers,regionalisation and Pacific‐Asia links in the Tasmanian and Hawkes Bay apple industries     

S. Grosvenor  R. Le Heron  M. Roche 《The Australian geographer》1995,26(2):163-172

This paper examines the differing modes of insertion of the Australian and New Zealand apple industries into world apple markets, part of the evolving global fresh fruit complex. It is argued that the mix and behaviours of key actors in the global apple industry are realigning market links and production systems. Industry actors in Australia and New Zealand are confronting issues of quality and sustainability as a result of pressures from consumers, regulatory measures in traditional and emerging markets, and new technologies of production and distribution. Governments are laying the foundations of national, regional and industry sustainability policies. An examination of the detailed structure and adjustments of the apple industry in Hawkes Bay and Tasmania reveals considerable differences in local responses, institutions and degree of restructuring of markets. The preferences and quality control requirements of export markets are increasingly important, to the extent that cultural dimensions appear to be altering the commodification process.  相似文献   

2020年1月19日新疆伽师MS6.4地震强震动记录特征初步分析     

李文倩  朱皓清  何金刚 《内陆地震》2020,(1):63-69

2020年1月19日新疆伽师发生M S6.4地震,新疆强震动观测台网共获取44组强震动记录,西克尔强震台获得本次地震最大峰值加速度633.3×10-2 m·s-2。本文对获取到的强震动记录进行初步整理、分析,拟合得到本次地震地震动峰值加速度衰减关系,在300 km范围内与经验性衰减关系相差不大。计算分析了峰值加速度大于100×10-2 m·s-2的5个典型强震台站加速度反应谱,并与设计反应谱进行对比分析,同时计算了这5个台站地震动70%及90%能量持时,两者相差较大,反映出地震主要能量释放集中在相对较短的时间内。  相似文献   

粤港澳大湾区城市网络的时空演化     

熊瑶  黄丽 《世界地理研究》2019,28(5):83-94

城市网络演化是城市-区域规划及建设的重要依据。通过链锁网络模型及社会网络分析法,利用上市企业总部-分支机构数据,分析粤港澳大湾区城市网络的演化特征。结果显示：粤港澳大湾区上市企业总部呈高度集聚分布,总部经济的辐射范围逐步扩大。港深广之间高强度联系构筑一条联通廊道,香港、深圳的双核心地位凸显。城市网络单向流动特征明显,除香港为输出型城市,其他城市均为输入型,流入-流出不对称性逐渐减弱。粤港澳大湾区城际联系由地理邻近的片区化组团向跨片区融合发展转变。整体城市网络呈现高密度、去中心化趋势,并由形式多中心向功能多中心转变,进入离心化的功能多中心发展阶段。  相似文献   

地理学视角的京津冀地区工业企业融资成本分析   总被引：1，自引：1，他引：0  

李博  李启航  孙威 《地理学报》2019,74(6):1149-1162

企业融资难和融资成本高是近年来制约中国实体经济发展的重要因素,但是哪些又是影响企业融资成本高的因素呢?基于京津冀地区商业银行分支机构和工业企业的大数据挖掘,定量分析了企业融资成本与商业银行分支机构的距离、1~5 km半径内商业银行分支机构的数量的相关性,解释了地理因素对企业融资成本的作用机制。研究表明：① 总体上看,与商业银行分支机构的距离越近、1~5 km半径内商业银行分支机构的数量越多,工业企业的融资成本越低。② 与商业银行分支机构的距离、1~5 km半径内商业银行分支机构的数量对国有工业企业和非国有工业企业都有显著影响,其中对非国有工业企业的影响显著性更高。③ 北京和天津的工业企业融资成本与商业银行分支机构的距离无关,与1~5 km半径内商业银行分支机构的数量负相关;河北省的工业企业融资成本与商业银行分支机构的距离正相关,与1~5 km半径内商业银行分支机构的数量负相关。④ 与商业银行分支机构的距离对重工业企业和劳动密集型企业的影响更显著,1~5 km半径内商业银行分支机构的数量对不同行业的影响差异性不大。  相似文献   

海带膳食纤维的理化特性及通便作用研究     

谭姣姣  王晶  岳洋  张全斌 《海洋科学》2018,42(6):53-56

海带富含褐藻胶、纤维素和半纤维素等成分,是生产膳食纤维的优质原料。本文以海带为原料制备海带膳食纤维,并开展了海带膳食纤维与两种常见膳食纤维的理化性质及通便作用的比较研究。结果表明,海带膳食纤维持水力和膨胀力优于燕麦膳食纤维和魔芋膳食纤维;在通便实验中,小鼠给予海带膳食纤维一段时间,小鼠墨汁推进率和便秘模型小鼠排便粒数以及排便重量均明显优于空白对照小鼠以及其他膳食纤维处理小鼠。上述研究表明海带膳食纤维各项生理指标作用最好,并具有较好的通便作用。  相似文献