面向资源发现的联合目录体系构建研究

[目的/意义]分析联合目录在资源发现中的功能作用,优化联合目录体系,提升资源发现服务效益。[方法/过程]通过调研国外典型联合目录建设现状,分析联合目录建设发展特征,结合中国文献资源建设现状提出构建新型联合目录体系,自下而上包括协调运行层、系统工具层、数据汇交层、数据管理层和数据服务层。[结果/结论]面向发现服务的联合目录体系特征突出表现在3个方面,参建主体多样化、建设对象同时涵盖印本资源和电子资源,数据、系统和服务的开放性得到明显强化,与数字出版时代的发展要求相一致,能够在一定程度上打破资源发现服务中的馆藏壁垒,进一步推动文献资源的共享利用。     

阜阳剪纸艺术在新媒体语境下的传播研究

纵观阜阳剪纸的渊源与现状,认为阜阳剪纸是一门古老的民间艺术,是安徽省国家级非物质文化遗产,在皖北地区颇具影响。然而阜阳剪纸"地域相承、亲缘相承、师徒相承"的传播方式,极大地限制了它的发展潜力。研究着重探讨了阜阳剪纸资源的整合方法与整合平台的建立,认为新媒体时代的到来为阜阳剪纸艺术的传播敞开了从区域到全国乃至世界的大门,因此,利用多种新媒体技术途径,对阜阳剪纸艺术进行资源整合,建立多媒体传播系统,使阜阳剪纸艺术在传承中得到更广泛的传播,显得尤为重要。     

论油气储运设施安全的重要性

油气储运设施是连接石油工业产、运、销各环节的纽带,其安全重要性日益凸显。介绍了油气储存和运输设施的分类依据及主要类型;从储运介质的易燃易爆和毒害性、油气储运设施易构成重大危险源两个方面论述了油气储运设施安全的重要性;通过总结近年发生的大连＂7.16＂爆炸事故、大型储罐火灾事故及油气管道泄漏事故的教训,指出第三方破坏是导致管道发生泄漏事故的主要原因,而打孔盗油又是其中的重要因素;提出了在工程立项、设计、施工及运行管理的各个阶段加强安全管理的具体措施。     

我国畜禽粪便处理利用现状及展望

随着农业结构调整和农业产业化的推进,以及规模化、集约化畜禽养殖业的迅猛发展,其规模由小到大,范围由点到面,但由于畜禽养殖业管理薄弱和农业与养殖业脱节,致使大量畜禽粪便与污染物随意排放和流失,破坏了生态环境.为此,介绍了畜禽粪便的处理方法和资源化技术,并根据我国现状提出了畜禽粪便处理利用的发展方向.     

Isolation of Pathogenicity Mutants of Fusarium oxysporum f. sp. melonis by Insertional Mutagenesis

Restriction enzyme-mediated integration (REMI) mutagenesis was used to isolate mutants of Fusarium oxysporum f. sp. melonis impaired in pathogenicity. The race 2 strain Mel02010 was transformed with linearized pSH75, conferring resistance to hygromycin B, with or without the enzyme used to linearize the plasmid. Addition of restriction enzymes did not affect the transformation frequency. A total of 2929 REMI transformants were tested for pathogenicity to three melon cultivars, Amus, Ogon 9 and Ohi. The race 2 strains are pathogenic to Amus and Ogon 9, but not to Ohi. Of 43 transformants with reduced pathogenicity on susceptible melon cultivars, 12 mutants were examined in detail for pathogenicity, vegetative growth and integrative mode of pSH75. The levels of pathogenicity varied among these mutants. Two mutants (B48 and B137) almost completely lost pathogenicity to both susceptible cultivars, and the others had reduced pathogenicity. Mutants B48, B241, B886 and X36 were also impaired in vegetative growth. Mutant B809 was a biotin auxotroph. By DNA gel blot analysis, nine mutants were found to contain a single copy of the transformation vector. These mutants may thus be useful in isolating genes involved in pathogenicity. Received 22 December 2000/ Accepted in revised form 16 April 2001     

油菜品种抗蚜性多目标模糊综合决策

作者采用模糊统计回归法，建立了油菜品种的自然感蚜量、蚜虫在品种上的“累积存活率”，平均发育历期、平均产仔量、内禀增长率及品种耐害性、干扰效应等抗性指的模糊隶属函数，建立了品种抗蚜性的模糊综合决策模型。结果表明，１２个品种抗性强弱为：红叶芥＞咸阳７４－１＞甘油５号＞８８６３１＞７２１１＞７５－１＞波力木耳＞８８６３８＞德国１５选株＞华油９号＞秦油３号＞秦油２号。同时作者提出的一套衡量品种抗性的指禁     

塔里木河下游生态输水对植物群落数量特征的影响

结合2002-2004年对塔里木河下游生态输水过程中5个断面固定植物群落样地的调查,运用群落数量分析法,分析了塔里木河下游植物群落对生态输水的响应.结果表明:在生态输水过程中,植被覆盖度普遍增加,草本植物覆盖度的增长率高于乔木和灌木;各断面乔木和草本植物的综合优势比普遍增加,但优势种的优势地位并没有改变,群落的类型没有变化;在整个研究区,物种的丰富度与均匀度仍很低.为提高输水生态效应,提出河道输水与面上供水相结合的输水方法和建立人工植被等建议.     

Pesticide use and residues on Queensland wool

Objective To determine practices for control of louse infestation and blowfly strike in Queensland sheep flocks that are associated with organophosphorous and synthetic pyrethroid residues on wool.
Design Information on residues was obtained from a survey of Queensland wool clips. Information on pesticide use was obtained from a trace-back postal survey. The association between pesticide use and residues was assessed using generalised linear models, controlling for potential confounding by flock location.
Procedure Between 1995 and 1997 Queensland wool clips were randomly sampled. Samples were tested for the presence and amount (mg per kg of greasy wool) of organophosphorous and synthetic pyrethroid pesticides. A questionnaire seeking information on flock characteristics and pesticide use was sent to the manager of each flock from which a wool sample was tested.
Results The median amount of OP and SP residue was 0.8 and 0.25 mg/kg, respectively, and 91 and 95% of wool samples contained < 8 mg/kg of OP and SP residues, respectively. The frequency of OP pesticide use for louse control was significantly (P = 0.005) associated with mean OP residue amount, and the timing of SP use for louse control, in relation to shearing, was significantly (P < 0.001) associated with mean SP residue amount.
Conclusion Most Queensland wool clips have acceptable amounts of residues after the use of OP and SP pesticides, but wool growers can further reduce residues by effectively controlling louse infestation with pesticide applications early after shearing and the use of non-chemical methods of ectoparasite control.     

基于Fuzzy-Smith控制器的营养液pH值调控系统研究

pH值的控制是水肥一体化营养液循环控制系统的重要环节，水肥控制过程中pH值在最优控制范围内有利于根系的发育以及多数矿物质的吸收。营养液调控过程中，由于循环管路以及酸液的缓慢扩散，使得pH值调节过程存在很大的时滞，传统PID难以取得良好效果。本研究根据被控对象特点，建立了描述该过程的数学模型，设计开发了一套具有二次混肥特性的以MSP430单片机为主控的营养液pH值控制系统。由于参数自整定模糊PID不需要精确数学模型以及Smith预估可对纯滞后进行补偿的特点，开发的系统将参数自整定模糊PID控制引入Smith预估当中，既缓解了滞后时间对控制系统的影响，又对模型的不精确性进行了补偿。为了验证该算法以及系统的有效性和优越性，分别对PID、Fuzzy-Smith控制算法进行仿真测试，同时在不同灌溉量下进行性能试验。试验结果表明，在不同灌溉量下Fuzzy-Smith控制算法pH值的平均最大超调量为0.83%，营养液pH值从8.0调节为6.0的平均时间为157s，优于常规PID控制的2.55%和189s。     

高职食品专业无机及分析化学教学改革与探索

介绍了无机及分析化学的课程特点、授课现状,及教学内容和教学方法上的改革实践,提出了在教学内容和教学方法上的改革与探索的想法。