施工进度计划编制的探讨

施工进度计划是施工单位的指导性文件。在工程建设活动中,施工进度计划宏观调控整个工程的进度,对工期准点到达起关键作用。从施工计划编制的实践出发,提出了施工进度计划编制的要求和依据,阐述了职工进度计划的编制和优化,为以后的现场施工工作提供一定的参考。     

浅析公路工程施工进度计划的编制

施工进度控制是公路建设的的重要内容之一,施工进度计划的编制是公路工程施工控制的基础,计划的科学合理性在一定程度上将会影响到施工企业的效益。本文简述了公路工程施工进度计划编制的依据及原则,介绍了横道图和网络计划技术两种进度计划表达形式,并分析了各自的优缺点,探讨了公路工程施工进度计划的编制程序和方法。     

广东电信广场智能化信息工程进度管理优化研究

本文尝试借助Project2003,以及网络计划．甘特图和挣得值法等方法对广东电信广场智能化信息工程项目进度管理加以优化,并针对该项目中进度管理存在的问题,给出了相应的改进措施。     

用网络计划技术优化企业生产计划问题

应用网络计划技术对杭州开关厂在生产计划控制中存在的实际问题进行了深入的研究。在充分剖析理论的基础上，结合实际工作情况，对大型机电一体化设备CTH500kW中频加热机的生产技术准备工作进行了网络计划的编制。其中有工程分解的“条块”结合、工序编码系统、资源优化与时间优化的兼容等，取得了良好的成果。     

网络计划技术在建设工程中的应用

网络计划技术在工程进度管理中应用较为成熟和广泛。动态调整和方案优化是其最主要的应用特点。目前,网络计划技术在建设工程中的应用效果不甚理想,原因是多方面的,既有认识上的误区,也有管理、技术上的原因。提高网络计划技术在建设工程中的应用水平,主要对策有:遵循进度控制的原则、保证工期的合理性、提高网络编制水平、实施动态控制以及加强工程监理审核监督制度等。     

建筑施工项目的进度计划与控制问题研究

施工项目的进度计划是针对建筑工程施工阶段按照工作内容、施工程序、持续时间和衔接关系,根据工程总进度计划、项目总工期目标及可利用资源的优化配置等原则编制好的计划。建筑施工企业在工程建设中实行施工进度控制是企业生存和发展的基础和核心,在施工阶段搞好施工进度控制,达到增收节支的目的,是项目经营活动中重要的环节。施工进度控制贯穿于项目施工准备工作阶段、施工阶段,一直到竣工结算阶段的全过程,它直接关系到旋工企业效益的好坏。对这一问题进行研究,以便在企业的生产经营中起指导作用。     

室内装饰工程项目管理存在问题分析

近年来，随着房地产业的飞速发展，我国室内装饰施工也有了相应发展，其进度计划及控制问题日益严重，缺少正规流程、工期延误、成本高居不下、资源严重浪费等问题对室内装饰工程项目的质量造成了直接影响。本文对室内装饰工程项目管理中的进度计划及控制问题进行深入探讨，在分析其存在的主要问题及原因的基础上，提出解决对策。     

项目管理中进度控制的几点思考

进度控制管理是项目管理的重要内容之一,它对确保项目工期目标按期实现起着重要作用,项目进度计划的合理编制是进度控制管理的基础和前提,项目进度控制实施是一个计划编制审核、检查分析与反馈调整的动态控制过程。     

某核电项目常规岛“汽轮机扣缸”专项进度计划管理方法及汽轮机扣缸前安装进度影响因素分析

在前期土建施工滞后严重、TG设备到货滞后、工期紧张的情况下,国内某核电工程通过对汽轮机本体安装进行合理有效的“汽轮机扣缸”专项进度管理,使得“汽轮机扣缸”这一重大节点提前实现。本文重点阐述了该工程专项进度计划实施的组织机构、专项进度计划的管理方法以及实施效果。该工程汽轮机本体安装从“2#低压缸外下缸就位”到“汽轮机扣缸完成”共7．5个月工期。采购物项到货滞后是影响本工程汽轮机安装进度的重因素。在工期紧张情况下,采用临时顶轴油系统可大大缩短顶轴油可用的施工工期。     

建筑施工中进度控制

建筑工程的进度控制是建立在合理的施工方案的基础之上的,影响工期的关键线路的各个分项工程都至关重要。施工进度计划是进行进度控制的基本依据。     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Synthesis of Alumina-Zirconia Nanocomposites by Solgel Process

Al₂O₃-ZrO₂ nanocomposites were developed starting with the solgel process. Composite alumina-zirconia nanopowders were synthesized from metallorganic precursors (Aluminium secondary butoxide and zirconium Iso propoxide) using the solgel process. The parameters affecting the synthesis—solvent, concentration of precursor, R/H ratio (i.e., dilution of water in solvent)—were varied as also the temperature and pH. BET and TEM were used to measure nanosize. Diffuse reflectance spectroscopy and also qualitative optical absorption led to identical particle size estimate. The variation of process parameters was used to study the effect and interdependence of process parameters. Artificial Neural Networks was used to rigorously analyze the process. Although this led to confirmation of interdependence of parameters, the presence of a single overwhelming solvent variable was also established. Then the optimal process was used to synthesize more nanopowder. To produce bulk nanocomposite the nanopowders were sintered by varying the temperature and time period. The sintered lithoids were probed with a vickers hardness tester to measure elastic modulus, hardness, and fracture toughness. The results showed high elastic modulus, modest hardness, and very high fracture toughness.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Friction Stir Processing Strategies for Uniform Distribution of Reinforcement in a Surface Composite

Friction stir processing (FSP) is an important technique for preparing surface composites. Fabricating defect-free surface composites with uniform particle distribution by FSP is a challenging task. In this study, silicon carbide particles reinforced AA5083 alloy surface composites was fabricated using different FSP strategies including variation in process parameters, dual-tool processing and tool offset overlapping. Material flow of the processed material with reinforcement particles demonstrated that the distribution of particles was influenced by the stirring action of the probe as well as the extrusion of the plasticized material due to the movement of the tool. Process parameters, particularly rotational speed, showed a dominant influence on the distribution of silicon carbide particles.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.