五矿营钢1＃高炉空料线停炉操作实践

本次停炉采用无预休风,正常喷煤富氧、炉顶雾化打水、分段上停炉料、较高顶压、全风状态下降料面停炉,实现了降料面过程的快速、安全、环保。     

现代汉语句末语气词研究

在前人研究的基础上,对现代汉语句末语气词的来源、称谓、界定、分类、语气意义、语用功能以及连用等方面进行了考察,通过替换、对比等方法,分析语料,以期进一步概括句末语气词的特点及其功能。     

CAD/CAM在高炉炉壳制造中的应用

文章利用计算机计算及自动编程,CAD展开制图,钢板在平板状态下采用数控切割,一次性完成炉壳及表面一系列定位开孔,开孔位置精确,切割精度高,加工成本低,实现现代化生产,提高了结构件制作速度和高炉的建造质量.     

自由基与肺癌发病机制

肺癌是严重影响人类健康的疾病,其发病机制目前尚未阐明.自由基医学是近年来兴起的一门交叉学科,本文对自由基在吸烟、职业烟尘微粒、金属离子、石英、石棉等理化因素致肺癌过程中的发病机制进行探讨.     

工频炉高压起动柜控制系统研究

工频炉现在使用越来越广泛,但起动异常和烧高压起动柜中电抗器等现象一直是困扰生产的首要问题。通过对某机修厂铸铁车间工频炉起动异常和烧高压起动柜中起动电抗器情况的分析,制定了高压起动柜控制系统的改进方案,通过增设保护电路和报警电路等装置,提高了设备运行的稳定性。     

甲烷氧化偶联钙钛矿型纳米催化剂的制备及性能测定

采用溶胶-凝胶法制备了SrTiO3及其镁掺杂的钙钛矿型复合氧化物超细微粒催化剂,应用TEM、XRD等手段,研究所得超细微粒催化剂的粒子大小、组成结构与OCM反应催化性能。结果表明:高温、粒子细化、B位掺杂对OCM反应CH4的转化率、C2选择性都有提高。750℃时,SrTi0.9Me0.1O3对OCM反应的甲烷转化率为28.9％,C2选择性为60.0％。     

FRP Retrofitted RC Slabs Using Finite Difference Model

Current guidelines recommend using single-degree-of-freedom(SDOF) method for dynamic analysis of reinforced concretec (RC) structures against blast loads, which is not suitable for retrofitted members. Thus, a finite difference procedure developed in another study was used to accurately and efficiently analyze the dynamic response of fibre reinforced polymer (FRP) plated members under blast loads. It can accommodate changes in the mechanical properties of a member's cross section along its length and through its depth in each time step, making it possible to directly incorporate both strain rate effects (which will vary along the length and depth of a member) and non-uniform member loading to solve the partial differential equation of motion. The accuracy of the proposed method was validated in part using data from field blast testing. The finite difference procedure is implemented easily and enables accurate predictions of FRP-plated-member response.     

Numerical Simulation of Dynamic Response of an Existing Subway Station Subjected to Internal Blast Loading

In order to design and retrofit a subway station to resist an internal blast,the distribution of blast loading and its effects on structures should be investigated firstly.In this paper,the behavior of a typical subway station subjected to different internal blast Ioadings was analyzed.It briefly introduced the geometric characteristics and material constitutive model of an existing two-layer and three-span frame subway station.Then three cases of different explosive charges were considered to analyze the dynamic responses of the structure.Finally,the maximum principal stress,displacement and velocity of the columns in the three cases were obtained and discussed.It concluded that the responses of the columns are sensitive to the charge of explosive and the distance from the detonation.It's also found that the stairs between the two layers have significant effects on the distribution of the maximum principal stress of the columns in the upper layer.The explicit dynamic nonlinear finite element software-ANSYS/LS-DYNA was used in this study.     

Introduction to Enhanced Protective Film Systems

An explosive blast mitigation alternative has increased the safety of structures by using "catcher" systems.These systems " catch" or repel the failure of the window or in-fill wall protecting life and property from ballistic shards or fragments.They can be designed to be standalone in new construction and structural retrofits or used to augment structural hardening techniques.Cables,fabrics,and thin gauge sheet steel are examples of catcher systems used in the past.A new and evolving category of catcher systems are based on polymeric materials that can be used for both wall and window upgrades.These products are a proven blast mitigation concept and K&C Protective Technologies Pte Ltd (KCPT) together with Sherwin-Williams(SW) use KCPT's blast engineering capacity and SW's material engineering principles to create engineered systems for even greater in-use performance.     

Simulation of the Response of Glass Window Under Blast Load

In the investigation of accidental explosion scene, the damage on the glass is one of the typi-cal traces which can be used to decide the characteristic of the explosion source. To analyze the re-sponse of glass under the blast load, a numerical model was developed. In the model, the brittleness glass model was adopted. A‘node release’method, which had some special merits compared with the erosion method was used to simulate the rupture of the glass In the calculation, several problems which play major role in the response of the glass were discussed. The velocity and the displacement of the glass fragment were two major factors. The numerical results are very helpful for the design and hazard assessment.