物流系统是指在一定的时间和空间里，由所需输送的物料和包括有关设备、输送工具、仓储设备、人员以及通信联系等若干相互制约的动态要素构成的具有特定功能的有机整体。随着计算机科学和自动化技术的发展，物流管理系统也从简单的方式迅速向自动化管理演变，其主要标志是自动物流设备，如自动导引车(AGV-Automated guided vehicle)、自动存储、提取系统(AS/RS-Automated Storage/retrieve system)、空中单轨自动车(SKY-RAV-Rail automated vehicle)、堆垛机(Stacker crane)等，及物流计算机管理与控制系统的出现。
标签： 物流系统
上传时间： 2014-01-08
上传用户：zhaiyanzhong
一个基于VB的仓库管理系统，采用ACCESS数据库，ACCESS数据库密码为：prowind，登录帐号为Admin，密码为空。这个仓库管理系统功能还挺多，程序要用到FxPrint、Storage.dll控件，已打包。请先编译生成EXE文件再运行，否则会报错。这套仓库管理系统大致可分为信息输入、单据管理、查询统计、报表中心、维护设置等等。
标签： 仓库管理
上传时间： 2014-01-02
上传用户：huyiming139
PURPOSE OF THE PROJECT: This Application would facilitate the huge process of managing the Ad details along with the Preview of the Ad (Audio Storage and retrieval). The Application has the following functions User Validation. Viewing Advertisement details. Registration of New User. Reviewing Advertisement details. Saving data to the Database generating Unique records.
标签： Application facilitate the managing
上传时间： 2017-09-01
上传用户：fxf126@126.com
A generic widestring list for use in all versions of Delphi. It has all the capabilities you find in the TStrings class, can be sorted etc. Suitable for persistent Storage.
标签： capabilities widestring all versions
上传时间： 2013-12-26
上传用户：hn891122
FastDFS集群的安装、配置、使用。包括tracker，Storage，Nginx的配置。
标签： FastDFS
上传时间： 2017-03-02
上传用户：高山不再高
Lithium–sulfur batteries are a promising energy-Storage technology due to their relatively low cost and high theoretical energy density. However, one of their major technical problems is the shuttling of soluble polysulfides between electrodes, resulting in rapid capacity fading. Here, we present a metal–organic framework (MOF)-based battery separator to mitigate the shuttling problem. We show that the MOF-based separator acts as an ionic sieve in lithium–sulfur batteries, which selectively sieves Li+ ions while e ciently suppressing undesired polysulfides migrating to the anode side. When a sulfur-containing mesoporous carbon material (approximately 70 wt% sulfur content) is used as a cathode composite without elaborate synthesis or surface modification, a lithium–sulfur battery with a MOF-based separator exhibits a low capacity decay rate (0.019% per cycle over 1,500 cycles). Moreover, there is almost no capacity fading after the initial 100 cycles. Our approach demonstrates the potential for MOF-based materials as separators for energy-Storage applications.
上传时间： 2017-11-23
上传用户：653357637
Lithium–sulfur (Li–S) batteries with high energy density and long cycle life are considered to be one of the most promising next-generation energy-Storage systems beyond routine lithium-ion batteries. Various approaches have been proposed to break down technical barriers in Li–S battery systems. The use of nanostructured metal oxides and sulfides for high sulfur utilization and long life span of Li–S batteries is reviewed here. The relationships between the intrinsic properties of metal oxide/sulfide hosts and electrochemical performances of Li–S batteries are discussed. Nanostructured metal oxides/ sulfides hosts used in solid sulfur cathodes, separators/interlayers, lithium- metal-anode protection, and lithium polysulfides batteries are discussed respectively. Prospects for the future developments of Li–S batteries with nanostructured metal oxides/sulfides are also discussed.
上传时间： 2017-11-23
上传用户：653357637
Abstract—In the future communication applications, users may obtain their messages that have different importance levels distributively from several available sources, such as distributed Storage or even devices belonging to other users. This scenario is the best modeled by the multilevel diversity coding systems (MDCS). To achieve perfect (information-theoretic) secrecy against wiretap channels, this paper investigates the fundamental limits on the secure rate region of the asymmetric MDCS (AMDCS), which include the symmetric case as a special case. Threshold perfect secrecy is added to the AMDCS model. The eavesdropper may have access to any one but not more than one subset of the channels but know nothing about the sources, as long as the size of the subset is not above the security level. The question of whether superposition (source separation) coding is optimal for such an AMDCS with threshold perfect secrecy is answered. A class of secure AMDCS (S-AMDCS) with an arbitrary number of encoders is solved, and it is shown that linear codes are optimal for this class of instances. However, in contrast with the secure symmetric MDCS, superposition is shown to be not optimal for S-AMDCS in general. In addition, necessary conditions on the existence of a secrecy key are determined as a design guideline.
标签： Fundamental Limits Secure Class on of
上传时间： 2020-01-04
上传用户：kddlas
Electricity has been chosen as the most convenient and useful form of energy, due to its ease of transportation over large distances and easy conversion to other energy forms. The biggest inconvenience with electricity is that it cannot be stored and must be utilized at the moment of generation. The Storage of a large amount of electrical energy is usually connected with its conversion to other types of energy, which significantly reduces the efficiency of such processes. The aim of the power system, often treated as the biggest and the most complex machine ever built, is to deliver uninterruptible electric energy of demanded quality parameters to consumers.
标签： Electromagnetic Interference Conducted
上传时间： 2020-06-07
上传用户：shancjb
The author of this textbook intends to consider all stages of the life cycle of the energy resources: extraction of mineral energy resources and mastering for power engineering renewable energy, transportation of mineral energy raw materials to the place of consumption, the conversion of primary energy sources into electrical and/or thermal energy, transportation and distribution among the customers, and energy Storage (if necessary).
标签： Engineering Electrical Current Power State
上传时间： 2020-06-07
上传用户：shancjb
