美洲狼尾草与象草杂交种生产的花期相遇及积温稳定性研究

通过分期短日处理和分期播种的方法，研究了美洲狼尾草与象草杂交种生产中双亲的光温特性，探讨杂交制种适宜花期的选择。试验结果表明：1．象草N51短日处理至抽穗期的积温值在年度间及年内的差异均较大。而处理至抽穗的天数较稳定为36．7±4．5天。2．美洲狼尾草不育系Tift23A为喜温短日作物，由于年度间气候差异表现为不同年份播种至抽穗的天数差异极大，可达20天以上。积温值年度间及年内差异也极大。3．象草的有效下限温度为13．6℃，美洲狼尾草不育系Tift23A约为14．8℃。4．杂交制种的适宜花期为8月下旬，即美洲狼尾草不育系Tift23A在6月1日、10日分期播种，而象草N51在7月15日进行短日处理，可实现花期相遇。     

会宁县马铃薯产业发展现状及对策

通过会宁县马铃薯产业现状分析,指出会宁县马铃薯产业中存在着品种混杂、增产普及率低、脱毒种薯应用规模过小、缺乏“龙头”企业组织带动作用、服务体系薄弱、中介组织短缺等问题。认为应推广马铃薯的栽培增产技术,建立马铃薯脱毒快繁中心,重点培养“龙头”加工企业,改善马铃薯产业的投资结构,建立马铃薯系列化服务体系,发展订单农业和品牌战略。     

Shellfish farming and Coastal Zone Management (CZM) development in the Marennes-Oléron Bay and Charentais Sounds (Charente Maritime, France): A review of recent developments

France is currently one of theleading shellfish production countries inEurope, harvesting more than 150,000 metrictons of the Pacific cupped oyster (Crassostrea gigas) and 60,000 tons ofmussels (Mytilus edulis and M.galloprocincialis) each year. Amongrearing areas, the Charentais Sounds and theMarennes-Oléron Bay rank first in Europe,with an annual production of 40,000 and 15,000tons of oysters and mussels respectively. Morethan a third of French production is marketedfrom the Marennes-Oléron area. As naturalC. gigas and M. edulis spatfall islimited to the Atlantic coast, theMarennes-Oléron Bay and the CharentaisSounds play a critical role nationally,representing more than half of French oysterand mussel spat production. The stockingbiomass in this area was recently estimated at125,000 and 20,000 tons of oysters and musselsrespectively. This biomass is deployed over4,000 ha of leasing grounds along the coastalarea and 3,000 ha of wetlands (oyster ponds),which are environmentally sensitive and subjectto numerous recent regulations.Although a traditional, century-old activity,the shellfish industry now has to addressvarious new internal and external constraintsaffecting overall economic yield andsustainability. These include the management offreshwater inputs into the coastal area,impacted at the watershed level by agriculturefrom a qualitative and quantitative point ofview (e.g. irrigation activity). Moreover, theCharentais Sounds need to remain competitive onthe open market with other French and Europeanproduction sites, whereas its biological yieldremains one of the lowest in France. This hasprompted the industry to optimize spatialdistribution, restructure current leasinggrounds and assess new management practices aswell as new rearing techniques (offshore, longlines), which have led to conflicts overavailable space. In addition to technicalconstraints, local, national and Europeanregulations have increased significantly. Thecoastal law, water law, bird directives, andregulations concerning the preservation ofnatural habitats, wild flora and fauna andprotected areas are among the acts likely tohave an impact on the shellfish industry in thenear future.These internal and external constraints onaquaculture sustainability are analyzed, andcertain case studies in the Charentais Soundsthat have led to user conflicts are reviewed.The diversity of habitats, human activities andinterests along this coast have resulted inhighly complex situations in which somemanagement attempts have been partly successfuland others have failed. These managementoptions are analyzed, and ongoing newapproaches are described, including cooperativestrategies among marine biologists,sociologists, economists, managers, coastalusers, and the shellfish industry. Based onthis analysis, requirements for the developmentof an integrated CZM plan in the CharentaisSounds are suggested, including the use of aproactive approach, geomatics and operationalmodels, as well as the development ofintegrated decision making structure to developCZM and then, the use of a stepwise model ofagreement-focused negociation for furtherconsensus building.     

Agreement between invasive blood pressures measured in three peripheral arteries in anaesthetized horses under clinical conditions

Objective

To determine agreement between invasive blood pressures measured in three peripheral arteries in anaesthetized horses undergoing elective surgery.

对Cache一致性问题的探讨

在多处理器系统中普遍使用高速缓存(Cache)来提高系统的性能,高速缓存的使用虽然提高了数据的存取速度,但也引出了高速缓存一致性问题。主要讨论了高速缓存出现不一致性的各种情况,并综述了目前针对高速缓存不一致问题的解决方案。     

基于LT码数据分发协议性能分析

中国证监会发行审核委员会作为实施我国股票发行核准制的一个配套制度设置,其命运与核准制一样,自成立以来就逃不脱业界与公众的诟病,其组成和运作机制虽在2003年后经重大改革,仍远未满足公众的要求。为帮助其获取业界与公众的信任与支持,对发审委的法律地位、目前的组成和运作机制之不足进行研究并予以改善,是比对发审委及其委员进行事后问责成本更低但更为有效的方法。     

浅析IPV4向IPV6的过渡

IPv4地址资源的短缺决定了基于IPv6技术的网络时代的必然到来.本文主要分析了IPv4面临的问题.IPv6的定义、发展现状及优势,存在的问题以及IPv6发展趋势等,试着探讨下一代互联网协议IPV6发展.     

《中越北部湾渔业合作协定》对我国南海各省（区）海洋渔业影响的初步分析

在初步分析了《中华人民共和国政府和越南社会主义共和国政府北部湾 渔业合作协定》的签定背景和主要内容的基础上，本文针对我国在北部湾业现状，由此可能产生的影响以及应采取的对策进行了初步探讨，认为划界后，南海区将有大批渔船湾西部渔场退出，造成经济损失约99．3亿元，同时渔民转产难度较大，会对近海渔业资源造成更大压力，增大机动渔船禁渔区和禁渔期等制度实施难度。此外，由于渔船的装备和渔民的水平等，难以确切把握北部湾的分界线，容易造成纠纷。本文据此对我国在北部渔业管理中应注意的问题提出几点看法；（1）扩大宣传，提高全社会保护渔业资源的理解；（2）降低捕捞强度，继续调整作业结构；（3）调查渔业资源，合理制定资源开发，利用方案；（4）成立专门机构，统一贯彻落实新规定。     

日本“家族经营协议的内容与模式分析

“家族经营协方”在日本农业经济中已经越来越被重视和推广。“家族经营协议”是指在日本农业经济中,为培育法人经营,确保务农事业后继有人,确立 家族务农场的法律地位而形成的一种民法。它的中心目标是把农业作为一种职业,认人们自由选择。同时,“家族经营协议”：以形式确定劳动力在生产经营中的重要作用,也给日本经济带来了新生命力,根据得中国学习借鉴。     

中国加入世界贸易组织后农产品面临的市场机遇与挑战

本文论述了中国加入世界贸易组织后，农产品市场面临的挑战和影响，以及面临的市场机遇，挑战及采取的对策。