突出地域特色的植物科学与技术专业教学改革

培养富有创新精神和开拓能力,理论坚实并具有现代植物生产技能,能够献身生态重建和区域农业发展的应用型高级技术人才。以此作为专业教学改革的基础目标,通过教师队伍素质和水平培养提高,着力相关课程改革,坚持理论教学面对区域农业发展实际,跟踪农业技术发展前沿,强化具有就业市场竞争能力的专业技能培养,通过办学条件的改善,使富有地域特色的专业教学改革取得初步而又明显的成效。     

Towards Enhancement of the Economy of a Thermal Power Generating System through Prediction of Plant Efficiency

The plant ‘Heat Rate’ (HR) is a measure of overall efficiency of a thermal power generating system. It depends on a large number of factors, some of which are non-measurable, while data relating to others are seldom available and recorded. However, coal quality (expressed in terms of ‘effective heat value’ (EHV) as kcal/kg) transpires to be one of the important factors that influences HR values and data on EHV are available in any thermal power generating system. In the present work, we propose a prediction interval of the HR values on the basis of only EHV, keeping in mind that coal quality is one of the important (but not the only) factors that have a pronounced effect on the combustion process and hence on HR. The underlying theory borrows the idea of providing simultaneous confidence interval (SCI) to the coefficients of a p-th p(≥1) order autoregressive model (AR(p)). The theory has been substantiated with the help of real life data from a power utility (after suitable base and scale transformation of the data to maintain the confidentiality of the classified document). Scope for formulating strategies to enhance the economy of a thermal power generating system has also been explored.     

外来物种入侵的生态危害

外来物种是指某种生物从原来的分布区域扩展到了一个新的地区,在新的区域里进行繁殖扩散并维持下去。这些外来物种会对入侵地的生态环境及生物多样性造成极其严重的威胁和破坏。     

Redesigning a Cellular Manufacturing System to Handle Long-Term Demand Changes: A Methodology and Investigation*

Cellular manufacturing systems have been proposed as an alternative to the job shop since they provide some of the operational benefits of a flow line production process, while retaining to some extent the flexibility of job shops. However, this must be balanced against the possibility of additional initial investments in equipment to form the cells and a certain loss in manufacturing flexibility, particularly in terms of the ability to deal with long-term demand changes. This paper presents a model-based heuristic cell system redesign methodology to deal with such demand changes. The methodology is validated and applied to system designs generated from several data sets published in the literature. Results show that different kinds of demand changes incur distinct kinds of costs. Further, characteristics of cell designs that can handle long-term demand changes at least cost are identified.     

Resource Flexibility Issues in Multistage Manufacturing

We test the situational impact of two types of resource flexibility, machine flexibility and labor flexibility, in a material requirements planning (MRP)-driven production system. Machine flexibility has not been treated in prior multistage research, only labor flexibility. Machine flexibility is closely related to a plant's positioning strategy. A process-focused plant opts for considerable machine flexibility by choosing general-purpose equipment. Resource flexibility, if effective, can be an attractive alternative to two other types of buffers, inflated inventories and costly capacity cushions. Our simulation results, using factor settings established earlier by a panel of managers, show that resource flexibility is indeed an effective buffer against uncertainties such as end-item demand variability, capacity bottlenecks, equipment failures, and yield losses. Machine flexibility is especially helpful in environments characterized by high uncertainties, tight capacities, and large lot sizes. Worker flexibility has a similar, but less dramatic, impact. Benefits are most striking with customer service, rather than with inventory or labor productivity. Finally, we show that simultaneous introduction of both machine and labor flexibility yields only marginal improvements over either kind of flexibility alone.     

“人肉搜索”的法理思考

"人肉搜索"作为一种网络新兴事物与现象,根据其对象和涉及事件类型的不同,可分为公众人物涉公事件型、非公众人物涉公事件型、公众人物涉私事件型和非公众人物涉私事件型四种类型.从法律角度而言,四类"人肉搜索"对个人隐私的侵入程度,呈依次递增趋势.同时,"人肉搜索"事件中涉及的网络信息发布者、网络信息传播者、网站三方,各主体责任也有所不同.     

雪兔子叶的组织培养及植株再生

以雪兔子无菌苗的幼叶为外植体 ,接种到MS补加NAA(1 0～ 2 0 )mg/L、6 -BA(0 1～ 1 0 )mg/L的培养基上诱导愈伤组织 ,其中以MS NAA 2 0mg/L 6 -BA 0 5mg/L的诱导效果最好 ,经 6周培养即可形成大量的黄绿色愈伤组织 ,诱导率可达 1 0 0 % 经 2～ 3次继代培养后 ,将生长良好的愈伤组织转接到MS附加 6 -BA(0 5～ 2 0 )mg/L、IAA(0 0 5～ 0 1 )mg/L、NAA(0 0 5～ 0 1 )mg/L、GA30 5mg/L不同组合培养基上诱导不定芽 ,适宜诱导芽的组合为MS 6 -BA 1 0mg/L IAA 0 1mg/L GA30 5mg/L 不定芽转接到MS IAA(0 1～ 0 5)mg/L培养基上 ,放入冰箱冷藏室处理 1 0天 ,然后 2 5℃培养一个月即可生根     

加拿大一枝黄花在安徽省的入侵现状、机理及对策

入侵生物加拿大一枝黄花近几年在安徽省迅速扩散蔓延,如果不加以控制,加拿大一枝黄花极易形成单一群落,严重破坏生物多样性。本文从加拿大一枝黄花在安徽省的入侵现状出发,着重探讨7其形成机制和防治对策。     

警惕经济全球化进程中美国的“文化侵略”政策

经济全球化的进程给广大发展中国家带来的机遇是不言而喻的,但在得到发达国家经济支持和先进管理理念的同时,以美国为首的西方发达资本主义国家的"文化侵略"也同时登陆,并已取得显著的成效,本文旨在通过分析美国文化侵略的现状和手段,根据中国的实情,提出自己的看法和解决方案,希望引起世界范围内对这一现象的重视.     

对外开放条件下产业安全研究的生态学思路

随着中国加入WTO,对外开放程度不断加大,产业安全问题越来越引起人们的重视。以往的研究多采用经济学和数学方法,从生态学角度对产业安全进行研究在国内外尚未见报道。论题借鉴生态系统健康理论提出了产业生态系统的概念、产业安全的健康指数和敏感性指标;借鉴生态入侵理论提出了产业入侵假说,如多样性阻抗假说、天敌逃避假说、空生态位假说、资源机遇假说、干扰假说、生态位机遇假说。生态学方法为产业安全研究提供了一种新的思路。