摘要：本文对用于满足新版IEC10 0 0 3 2 (第二版 )电流谐波限制标准规定的单相全桥LC滤波整流器进行了分析和设计。结果表明 ,如果设计适当的滤波电感值 ,本文所述的无源功率因数校正方法可以满足标准所要求的规定。本文分析了新版IEC10 0 0 3 2标准中划分为A类和D类电力电子产品满足标准规定的条件情况。计算机仿真和实验验证理论分析和计算结果。

摘要：网络能耗问题是当前网络研究和发展的重要问题,影响着网络的设计、应用和发展.当前网络能效算法的研究大多从网络局部角度关注于网络某一(些)设施的能耗问题,缺乏从网络全局的角度研究网络整体能耗的算法和策略.文中从网络全局角度研究网络的能耗模型和算法问题.文中基于3种基本网络数据传递模式和3种基本网络能耗机制,构建了网络能耗系统优化模型,对其中5种关键系统模型给出了详细的描述.针对几个关键系统模型,文中给出了形式化描述并且提出了相应的优化的节能路由算法.文中给出的网络系统能耗优化模型有助于对于网络能耗的理解和分析,所提出的能耗优化的网络数据包路由算法可以从网络路由的角度有效降低网络能耗.

摘要：The ability to finely control the structure of protein folds is an important prerequisite to functional protein design. The TIM barrelfold is an important target for these efforts as it is highly enriched for diverse functions in nature. Although a TIM barrel proteinhas been designed de novo, the ability to finely alter the curvature of the central beta barrel and the overall architecture of the foldremains elusive, limiting its utility for functional design. Here, we report the de novo design of a TIM barrel with ovoid (twofold)symmetry, drawing inspiration from natural beta and TIM barrels with ovoid curvature. We use an autoregressive backbonesampling strategy to implement our hypothesis for elongated barrel curvature, followed by an iterative enrichment sequencedesign protocol to obtain sequences which yield a high proportion of successfully folding designs. Designed sequences arehighly stable and fold to the designed barrel curvature as determined by a 2.1Å resolution crystal structure. The designs showrobustness to drastic mutations, retaining high melting temperatures even when multiple charged residues are buried in thehydrophobic core or when the hydrophobic core is ablated to alanine. As a scaffold with a greater capacity for hosting diversehydrogen bonding networks and installation of binding pockets or active sites, the ovoid TIM barrel represents a major steptowards the de novo design of functional TIM barrels.

摘要：Jesus fernandez为我们展示如何制作一个像居家男一样,可爱的毛茸茸3D角色本教程将带你领略一个崭新的3D生物的建模并设计全过程。我们将从零开始,完成整个创建过程,直到实现最终效果——一个柔软的让人心动的小怪物,并与环境产生互动效果。为了打造这个3D小毛怪。

摘要：孙子,这位“不朽”的大师,虽然生活在2500年前的中国古代,但是他的理论却完全适用于21世纪的企业经营管理。它可以帮你在竞争激烈。

摘要：In recent years,there has been an increasing interest in finding sustainable strategies for the efficient removal of contaminants from *** objective of this review is to examine the biochemical principles of specific genetic modifications in plants,their applications in the field for specific contaminants as phytotechnologies,and their international *** addition,the review presents some biological aspects of rhizosphere-related phenomena,the interactions of organic and inorganic pollutants with plants,and the performance of the phytotechnologies across the *** the last few decades,at least eight genera of genetically modified plants(GMPs)have been tested and used for soil remediation with outstanding ***,Nicotiana,and Oryza are the plant genera most widely *** plant genes such as metal transporters,chelators,metallothioneins,phytochelatins,and oxygenases have been transferred to plants to improve the elimination of contaminants in *** discuss some important aspects of gene manipulation and its application for removal of diverse contaminants.A key challenge faced by phytotechnologies is the final disposal of the generated biomass,from a safety *** argue that the commercial success of phytotechnologies depends on the generation of valuable biomass on contaminated land and its use for bioenergy *** use of such technologies would promote a broader understanding of the importance of plants,especially GMPs,in the environment and their contribution to environmental sustainability.

摘要：西班牙杂志《Juguetes》最近刊文对该国的女孩玩具市场进行了分析。目前西班牙女孩玩具市场有两个主要特点:首先,大量的产品融入了电子及电脑的设计元素,而且这种趋势日盛。另外,授权产品的竞争相当激烈,而其中不少的授权项目涵盖了所有商品类别。了解当今女孩玩具的多样性,熟悉上述两方面的特点是至关重要的。因为现在的制造商都致力于拓展自己的产品线,而不再拘泥于传统的产品类别。

摘要：本文提出针对心脏设备市场的完善、成本高效的硬件和软件解决方案,使设计人员能够选择应用所需的最佳处理核心、外设和连接选项。

摘要：由土壤保持局提供的关于土系及土壤制图单元的信息,已输入关系型数据库管理系统中。数据库的设计涉及到运用数据库管理系统的数据模型及对实施方案的评价。该数据库是地理信息系统的一部分,它将提供关于土壤侵蚀、土壤管理研究及土地税收预估评价的信息。土壤数据库的逻辑设计结果用以建立关系型数据模型,所得数据库是不受新的异态所约束,同时,又可以保存属性间所有的关系。

摘要：正值全球乱套之际,芬兰却是一个可以让世界回归正轨的典范。这个星球面临的生态和经济两大危机相互间推波助澜,已然有分崩离析之势。芬兰的做法或许可供借鉴:他们一方面小心看护着自己的城市和乡村景观,同时也充分享受着自由和福利。面对能源、气候以及环境等各种灾难,面对金融、政治以及体制等各类疾患。