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中国三大农业相关数据库比较研究 总被引:1,自引:0,他引:1
江洪涛 《农业图书情报学刊》2004,16(10):160-164
农业数据库是科研工作的基础工具,在选择和续订数据库中,由于我国数据库事业的发展迅速,往往难以用有限的经费购置最适合的数据库。本文在实际工作的基础上,根据各个数据库的特色,提出依据数据库的统计功能,定量地选择数据库,把数据库的订购工作贯穿于整个年度中。 相似文献
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狐狸养殖场生产管理信息系统的设计与应用 总被引:1,自引:0,他引:1
利用Visual Basic 6.0并结合数据库为开发工具,设计出一套狐狸养殖场生产管理的计算机摩用管理系兢。系统主要包括狐群管理、个体信息管理、统计分析、销售管理、仓库管理、系统维护6大功能模块及其下设的20余个子模块,能够实现对狐狸数据信息的录入、查询、删除、统计等功能。该系统的建立,可提高劳动生产率和狐狸养殖场的总体生产水平,促进狐狸养殖业向高产、优质、高效方向持续发展,以适应经济发展和人民的生活需要。 相似文献
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基于面向对象数据库db4o,利用AutoCAD 2006提供的二次开发工具ObjectARX.NET,采用Visual C#.NET2005开发了地籍测量系统。该系统不仅能满足地籍测量的日常工作要求,而且具有土地面积自动量算、信息查询、报表输出等功能。 相似文献
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circRNA(Circular RNAs)是一类不具有5'末端帽子和3'末端poly(A)尾巴并以共价键形成封闭环状结构的内源性非编码RNA(ncRNA)分子,根据circRNA的剪接来源不同,可分为外显子circRNA(Exonic cirRNAs)、内含子circRNA(cirRNAs)和外显子—内含子circRNA(Exon-in-troncircRNA,EIciRNA).文章从分子特征、研究历程、形成过程、作用机制及其数据库及分析工具等方面对circRNA研究现状和生物学功能进行综述,结果显示随着高通量测序技术的进步和生物信息学的快速发展,越来越多的circRNA被挖掘,其具有稳定性、广泛性、保守性及组织特异性等性质,在基因表达调控中发挥重要作用,可作为一种疾病的生物标志物,在临床诊断和治疗方面具有广阔的应用前景.但circRNA还有许多尚未知悉的重要生物学功能,如其在绒毛生长发育中的作用机理,且在疾病诊断和治疗方面研究不够深入.在今后研究中,应深入研究circRNA及其在疾病诊断、治疗方面及绒毛发育的作用机制,充分了解其更多的生物学功能,使其广泛应用于各研究领域. 相似文献
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Interventions shown to aid executive function development in children 4 to 12 years old 总被引:1,自引:0,他引:1
To be successful takes creativity, flexibility, self-control, and discipline. Central to all those are executive functions, including mentally playing with ideas, giving a considered rather than an impulsive response, and staying focused. Diverse activities have been shown to improve children's executive functions: computerized training, noncomputerized games, aerobics, martial arts, yoga, mindfulness, and school curricula. All successful programs involve repeated practice and progressively increase the challenge to executive functions. Children with worse executive functions benefit most from these activities; thus, early executive-function training may avert widening achievement gaps later. To improve executive functions, focusing narrowly on them may not be as effective as also addressing emotional and social development (as do curricula that improve executive functions) and physical development (shown by positive effects of aerobics, martial arts, and yoga). 相似文献
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农村集体经济组织产权问题会直接关系到“三农”发展的全局,农村集体经济组织产权所具有的“政社不分”、“产权不明”等一系列制度缺陷已经严重制约了农村集体经济的可持续发展。本文首先阐述了农村集体经济组织产权的内涵,其次,针对农村集体经济组织产权制度改革的基本原则,深入探讨了农村集体经济组织产权制度改革的相应措施,包括:注重培训提升能力、全面有序推进改革任务、保障农民集体股权权能行使等。 相似文献
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The models and simulation tools available to design functionally complex synthetic biological devices are very limited. We formulated a design-driven approach that used mechanistic modeling and kinetic RNA folding simulations to engineer RNA-regulated genetic devices that control gene expression. Ribozyme and metabolite-controlled, aptazyme-regulated expression devices with quantitatively predictable functions were assembled from components characterized in vitro, in vivo, and in silico. The models and design strategy were verified by constructing 28 Escherichia coli expression devices that gave excellent quantitative agreement between the predicted and measured gene expression levels (r = 0.94). These technologies were applied to engineer RNA-regulated controls in metabolic pathways. More broadly, we provide a framework for studying RNA functions and illustrate the potential for the use of biochemical and biophysical modeling to develop biological design methods. 相似文献
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《Computers and Electronics in Agriculture》1999,22(2-3):187-197
We present an opportunity to use a combination of computer based tools for generating risk functions, simulation, classical decision rules and linear programming (LP) as tools for decision making. This new approach is demonstrated by the use of an example which addresses the optimal assemblage of a pig fattening enterprise, whereby some basic data (e.g. prices, labour costs and average daily weight increases) are risk functions. Some coefficients, especially in the objective function (maximum gross margin) are stochastic values calculated with those ‘risky’ basic data. Various scenarios for different cases of risk behaviour are formulated and solved using decision rules. The optimal LP results are interpreted in deterministic and stochastic ways. 相似文献
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众所周知,连续函数的Gronwall-Bellman型积分不等式是研究微分方程和积分方程的解的定性性质的重要工具.同样地,非连续函数的积分不等式是研究脉冲微分方程的有用工具.文章研究了具有两个非常数因子的非连续函数的积分不等式,用分析的技巧给出了未知函数的上界估计,并用得到的结果给出了脉冲积分方程解的估计. 相似文献
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Chemical tools have proven indispensable for studies in glycobiology. Synthetic oligosaccharides and glycoconjugates provide materials for correlating structure with function. Synthetic mimics of the complex assemblies found on cell surfaces can modulate cellular interactions and are under development as therapeutic agents. Small molecule inhibitors of carbohydrate biosynthetic and processing enzymes can block the assembly of specific oligosaccharide structures. Inhibitors of carbohydrate recognition and biosynthesis can reveal the biological functions of the carbohydrate epitope and its cognate receptors. Carbohydrate biosynthetic pathways are often amenable to interception with synthetic unnatural substrates. Such metabolic interference can block the expression of oligosaccharides or alter the structures of the sugars presented on cells. Collectively, these chemical approaches are contributing great insight into the myriad biological functions of oligosaccharides. 相似文献
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杨文军 《农业图书情报学刊》2014,26(7):15-18
自跨平台开发技术概念出现以来, 跨平台移动开发工具已成为移动开发人员的首选, 移植、测试工作量也随之减少。但这些工具各有特点, 适应范围各不相同, 在此试图以PhoneGap开发移动图书馆门户的过程, 探索一种基于PhoneGap、标准Web开发语言(HTML、CSS、JavaScript、xml)及JavaScript框架环境下移动信息发布系统开发模式的可能性和现实性, 测试结果表明技术路线可行。 相似文献
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昆虫标本数据库管理系统 总被引:2,自引:0,他引:2
严乃胜 《云南农业大学学报(自然科学版)》1997,12(1):12-14
报道用FoxBase+2.1 设计的昆虫标本管理系统的功能及实现这些功能的途径和方法。该系统具有录入与修改功能6种,查寻功能5种,统计功能4种,打印名录及标签功能5种,系统工具功能6种,文献检索功能2种,所有功能均包括于下拉菜单中。 相似文献
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重视高校大学生智力因素的培养 总被引:3,自引:0,他引:3
本文简要论述了非智力因素对提高高校大学生综合素质和全面成才的作用和必要性,并对培养大学生非智力因素的主要内容和途径作了初步探讨。 相似文献