地下车库排风排烟合用系统的分析

根据《汽车库、修车库、停车库设计防火规范》的要求,针对地下车库的特点,对其排风排烟系统选用进行分析。     

某地下车库排风、防排烟系统设计研究

本文以某建筑地下车库为例,根据地下车库空间特点,结合相关规范要求,对风机选型进行了对比分析,并介绍了地下车库排风、防排烟系统的设计计算及设备的选型,做到了"一案一系统",可为类似系统的设计提供借鉴经验。     

地下车库CO浓度分布及排风方式的实验研究

新规范针对地下车库排风宜全部上排还是上下同排没有明确规定。以商业建筑地下车库作为实验平台,在排风方式、汽车排气口与排风口是否对齐等情况下进行实验,在排风口不同高度布置测量点,实测CO浓度和排风口风速。通过分析实验数据,选择出最合理的排风方式。     

地下汽车库通风与排烟设计探讨

通过对比《建筑设计防火规范》和《汽车库、修车库、停车场设计防火规范》中关于地下汽车库通风排烟设计方面的内容,探讨地下车库排烟系统与通风系统的几种常用方式,阐述了地下汽车库的排烟系统与通风系统兼用的可行性和实用性。     

建筑地下车库防火设计要点与防火安全

随着当前社会经济快速地发展,人们生活水平有了大幅度的提升,私家车成为人们日常出行的重要工具。随着私家车车辆的增加,地下车库的应用也不断增多。因此要做好地下车库设计,特别是要重视地下车库防火设计,全面提高地下车库防火安全。该文从建筑地下车库火灾危险性入手,分析了地下车库防火设计要点,并进一步对提高建筑地下车库防火安全提出了具体的建议。     

高层建筑地下车库的通风排烟问题分析

我国城市化发展不断推进，城市高层建筑和城市汽车的数量也在迅速增加，这便直接导致了地下停车库设计项目需求的扩增。在高层建筑的地下停车库项目设计的过程中，通风排烟问题的处理直接关系到地下室的功能分配和使用安全，因此为了更加全面的保证高层建筑地下车库的高效率安全使用．就必须强调地下车库的通风排烟问题。本文从高层建筑地下车库通风排烟设计方式的角度出发，对车库的通风和排烟问题进行了综合分析，并结合《高层民用建筑设计防火规范》等法规内容，探究了高层建筑地下车库通风排烟的最佳方式。     

射流风机通风系统在地下车库的应用

文章结合射流风机无管道通风系统的设计要点,对其在地下车库排风系统中的应用提出详细的计算方法.对该系统与排烟排风共用通风管道的投资效益进行分析比较.     

地下汽车库设备管线综合布置设计实例浅谈

受地下车库排风、人防、建造成本等因素的影响,各专业设备管线综合布置问题在地下车库设计中越来越突出。以某实际工程地下车库设计为例,对各专业管线综合布置设计的原则、布置方案和排布的方法和相应技术措施进行分析,结果表明当设计者遵循合理的布置原则和步骤进行管道综合设计时,不仅能提高计效率,满足指导施工安装的要求,还可以改善建筑使用效果并降低建造成本。     

浅议高层建筑地下车库防火设计

本文通过分析高层建筑地下车库火灾危险性和特点，着重探讨了车库的防排烟设计，提出提高地下车库防火安全性能的几点建议。     

建筑地下车库设计的关键问题研究

本文结合工程实例,从地下车库平面布置、竖向布置、防火分区布置等方面的优化设计内容,就如何加强地下车库设计中的关键问题方面提出了一些建设性的意见和建议。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

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.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

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.