内网补丁系统在宣钢局域网中的应用

随着宣钢办公信息化的不断推进,办公网络已成为办公信息化应用的基础平台,在宣钢办公和生产中发挥着重要的作用。由于大多数网络攻击或者是病毒入侵是系统本身的漏洞造成的,而且局域网内计算机的分布呈高密度状态,计算机之间极易发生病毒的交叉感染。因此,在微软补丁推出的第一时间安装,已经成为局域网安全的重要一环。     

服务器系统的安全配置

为确保服务器的安全,在安装Windows2000系统时,对硬盘分区、组件和管理应用程序及安装顺序的选择应引起足够的注意。文章对Windows2000系统的补丁和安全配置的方法也作了必要说明。     

升级优化大镁资源利用

<正>扩大及推广镁的规模化应用是镁业爆发式发展的必然选择。中国是世界镁资源大国,可利用的镁资源占世界储量的70%,是世界上原镁生产和出口量最大的国家。但是,中国的镁产品和镁合金加工技术水平较发达国家比较目前还处在较低的水平,属于典型的牺牲资源和环境为代价的原料出口型产业。而由于镁在国防、航天航空、汽车及轨道交通领域等领域的应用已被广泛关注和重视,如何升级镁及镁合金材料的应用,不但是为满足这些领域的需求更是成为优化大镁资源     

搭建"创先争优"平台创新开展实践活动

本文结合车辆管理处的工作实际,阐述了创先争优活动的重要性,并提出了开展创先争优活动的具体做法,有一定的借鉴意义.     

以安全助推钢铁企业转型升级

目前中国经济已进入由高速增长向中高速增长转换的新常态,钢铁行业正经历着转型升级的“阵痛期”,立足“安全化、市场化、专业化”发展路径,发展与安全并重,确保企业高速、稳定转型。     

关于升级安全生产标准化管理的思考与探讨

阐述铜冶炼行业当前面临的安全生产形势,分析安全生产标准化管理的现状,坚持应用系统管理方法解决安全生产问题的工作思路,基于安全风险管控的思想,提出安全生产标准化升级管理的主要措施和改进方向,促进工厂安全生产管理的全面升级,达到提升安全风险管控能力和水平的目标。     

利用Moodle搭建的高校网络课程平台的研究

针对目前高校网络课程平台多为商业软件的现状,提出利用开源软件Moodle搭建课程平台.本文分析了Moodle搭建网络课程平台的优势,并从教学资源共享、在线专题讨论、无纸化作业布置和批改、在线测试、过程记录和多元化评价五大环节具体阐述了Moodle平台在课程教学中的应用.     

浅谈水钢炼钢区域葫芦吊维护与升级

随着钢铁工业的发展,钢铁企业为了生存、发展,都在原有设备的基础上不断做大产能,降低成本。在做大产能的同时,无形中就加大了区域内行车作业率,系统生产对设备稳定的容错能力极端减少,突显了行车的检修、维护工作的重要性,怎样保证行车大型备件的及时、安全吊装,已成为当前行车维护检修面临的一大难题。     

铜山矿业压风装备多元化升级

安徽铜陵有色铜山矿业公司在生产中打破常规,实现管网供风与就地供风相结合的方法,并对压风设备重新配置,不仅提高工作效益,而且每年节省电费100多万元。铜山矿业公司40多年一直沿袭由地表压风机房空压机通过管网输送供风,由于管网路线长而且易腐蚀,跑风漏风现象严重,容易造成放矿气缸压力不足,导致卡矿现象发生,直接危及到矿山安全生产。为此,公司进行技术攻关,利用液压系统作为气缸的制动系统,打破制约生产多年的“瓶颈”。针对地表钻岩机需要供风情况,     

利用EXCEL辅助机房运行环境分析

机房运行环境的正常与否,将直接影响到机房各项业务能否正常开展,本文介绍了如何在机房巡检的基础上利用EXCEL来及时分析环境参数的异常变化,使机房运行环境处于良好的状态     

In-Plane Seismic Response of URM Walls Upgraded with FRP

Recent earthquakes have shown the vulnerability of unreinforced masonry (URM) buildings, which have led to an increasing demand for techniques to upgrade URM buildings. Fiber reinforced polymer (FRP) can provide an upgrading alternative for URM buildings. This paper presents results of dynamic tests investigating the in-plane behavior of URM walls upgraded with FRP (URM-FRP). These tests represent pioneer work in this area (dynamic and in-plane). Five half-scale walls were built, using half-scale brick clay units, and upgraded on one face only. Two moment/shear ratios (1.4 and 0.7), two mortar types (M2.5 and M9), three composite materials (carbon, aramid, and glass), three fiber structures (plates, loose fabric, and grids), and two upgrading configurations (diagonal “X” and full surface shapes) were investigated. The test specimens were subjected to a series of synthetic earthquake motions with increasing intensities on a uniaxial earthquake simulator. The tests validate the effectiveness of the one side upgrading: the upgrading technique improved the lateral resistance of the URM walls by a factor ranging from 1.3 to 2.9; however, the improvement in the lateral drift was less significant. Moreover, no uneven response was observed during the test due to the single side upgrading. Regarding the upgrading configurations, the bidirectional surface type materials (fabrics and grids) applied on the entire surface of the wall (and correctly anchored) can help postpone the three classic failure modes of masonry walls: rocking (“flexural failure”), step cracking, and sliding (“shear failures”). Additionally, in some situations, they will postpone collapse by “keeping the bricks together” under large seismic deformations. On the other hand, the diagonal “X” shape was less successful and premature failure was developed during the test.     

Behavior of Cyclically Loaded Squat Reinforced Concrete Bridge Columns Upgraded with Advanced Composite-Material Jackets

This paper summarizes comprehensive experimental studies on scaled models of squat bridge columns repaired and retrofitted with advanced composite-material jackets. In the experimental program, a total of 14 half-scale squat circular and rectangular reinforced concrete columns were tested under fully reversed cyclic shear in a double bending configuration. In order to provide a basis for comparison, a total of three as-built columns were tested. Another 10 column samples were tested after being retrofitted with different composite jacket systems. One circular as-built column was repaired after failure. The repair process involved both crack injection as well as addition of carbon/epoxy composite jacket. The repaired column was then retested and evaluated. Experimental results showed that all as-built columns developed an unstable behavior and failed in brittle shear mode. The common failure mode for all retrofitted samples was due to flexure with significant improvement in the column ductility. The repaired column demonstrated ductility enhancement over the as-built sample.     

Seismic Response of Interior RC Beam-Column Joints Upgraded with FRP Sheets. I: Experimental Study

In this paper, efficiency and effectiveness of carbon fiber-reinforced polymers (CFRP) in upgrading the shear strength and ductility of seismically deficient beam-column joints have been studied. For this purpose, four reinforced concrete interior beam-column sub-assemblages were constructed with nonoptimal design parameters (inadequate joint shear strength with no transverse reinforcement) representing preseismic code design construction practice of joints and encompassing the vast majority of existing beam-column connections. Out of these four, two specimens were used as baseline specimens (control specimens) and the other two were strengthened with CFRP sheets under two different schemes (strengthened specimens). In the first scheme, CFRP sheets were epoxy bonded to the joint, beams, and part of the column regions. In the second scheme, however, sheets were epoxy bonded to the joint region only but they were effectively prevented against any possible debonding through mechanical anchorages. All four subassemblages were subjected to cyclic lateral load histories so as to provide the equivalent of severe earthquake damage. Further, the damaged control specimens were repaired after filling the cracks through epoxy and wrapping them with CFRP sheets under the same two above-mentioned schemes. These repaired specimens were subjected to the similar cyclic lateral load history and their response histories were obtained. Hence, a total of six specimens were tested: two control; two strengthened; and two repaired. Response histories of control, repaired, and strengthened specimens were then compared. The results were compared through hysteretic loops, load-displacement envelopes, column profiles (maximum horizontal displacements of column along its height), joint shear distortion, ductility, and stiffness degradation. The comparison shows that CFRP sheets improve the shear resistance of the joint and increase its ductility. Results of two chosen schemes of strengthening were also compared and the importance of beam upgrading was highlighted.     

Seismic Response of Interior RC Beam-Column Joints Upgraded with FRP Sheets. II: Analysis and Parametric Study

In this paper a procedure for analytical prediction of joint shear strength of interior beam-column joints, strengthened with externally bonded fiber-reinforced polymer (FRP) sheets, has been presented. The procedure is based on the formulation available in the literature. To implement the available formulation for shear capacity prediction a computer program has been developed. Using this program shear capacity of the joint and joint shear stress variation at various stages of loading have been predicted and compared with experimental observations; presented in Part I of this study. Predictions show good agreement with experimental test results. The formulation is further extended to predict diagonal tensile stresses in the joint. The effectiveness of FRP quantity on joint shear strength and on various strains has been studied on parametric basis. It is observed that even a low quantity of FRP can enhance shear capacity of the joint significantly and its effectiveness can be further increased if debonding is suppressed (e.g., through mechanical anchorages). Effect of column axial load on shear strength of the joint has also been studied. It is observed that axial load increases the confinement of the joint core, which in turn increases the shear capacity of the joint.     

Information System for Building Products

In a building process that enables a proper flow of product information among the “Users of Information” (Agents), a “Product Information System” is proposed. The system established in connection with a set of criteria involves five subsystems (Thesaurus, Summarized Data, Manufacturers, Compatibility Tables, and Detailed Data) linked with each other. Agents looking for product information can enter the system through the subsystems Thesaurus or Manufacturers, and they can decide on the choice of appropriate products at the first stage (Summarized Data), whereby they can find access to the subsystem Detailed Data afterwards for the detailed information needed. The complete code presents a medium for a common language among the users of product information.     

Products approved for marketing during 1997

The aim of this study was to objectify and to clarity some mechanisms of the immune response of the professional sensitization with MDI. 26 workers were tested for sensitization of immediate type (ST with a broad set of indoor allergens and serum MDI-IgE) and of delayed type (ST with a standard battery of antigens for cellular immunity and with MDI), also the lymphocyte sub-populations and their functional state by flow cytometric analysis. The most frequent allergic complaints were: rhinits (70%), skin manifestations (53%), conjunctivitis (35%) and initial bronchial asthma in two cases (12%). We found indoor sensitization in 41% and normal cellular immune reactivity in all the workers tested. Specific MDI sensitization of immediate type was found in 28.5% of the workers and of delayed type--in 70% of the workers with allergic complaints. The laboratory immune indices suggest prevalence of cell--mediated mechanisms for the workers with allergic symptoms--production of INF gamma, responding to stimulation and deficient or insignificant production of IL-4, as well as linear correlation between the data for CMI, INF gamma, and IL-4. Our results suggest the participation of more than one mechanism of immune injury in the clinically manifested allergic reactions.     

中国钨品贸易概述及展望

主席先生、女士们、先生们 :今天有幸参加第１４届国际钨协年会 ,非常高兴。请允许我代表中国五矿集团与大家一起 ,共同回顾近５年来中国钨品的出口情况 ,特别介绍今年中国钨市场发生的变化 ,以及对未来中国钨品贸易的展望。１中国近５年钨制品贸易情况１．１钨品出口现状众所周知 ,５年来尽管国际钨市场波动反复 ,但总需求量没有大的变化 ,市场供应也相对稳定。作为主要供应国的中国 ,在市价持续低迷情况下 ,保持稳定供货 ,满足了市场需求 ,供应情况详见表１。从表１中可以看出 ,出口量从１９９６年的１．５万ｔ增加到１９９８年的２．３万…     

中国钨品贸易概述及展望

主席先生、女士们、先生们: 　　今天有幸参加第14届国际钨协年会,非常高兴.请允许我代表中国五矿集团与大家一起,共同回顾近5年来中国钨品的出口情况,特别介绍今年中国钨市场发生的变化,以及对未来中国钨品贸易的展望. 　　1中国近5年钨制品贸易情况 　　1.1钨品出口现状 　　众所周知,5年来尽管国际钨市场波动反复,但总需求量没有大的变化,市场供应也相对稳定.作为主要供应国的中国,在市价持续低迷情况下,保持稳定供货,满足了市场需求,供应情况详见表1. 　　从表1中可以看出,出口量从1996年的1.5万t增加到1998年的2.3万t,然后3年基本平稳,其中配额管理钨品出口逐年下降,见图1. 　　随着市场需求的变化,中国政府及时调整出口政策,逐年削减配额产品出口总量,加大深加工产品的出口,近几年来的出口商品结构发生了很大变化,见表2. 　　1.2钨品出口特点 　　近几年钨制品的出口具有如下特点. 　　(1)保证市场供应,并通过有效的管理使钨市场恢复合理的价格水平,中国的出口量更接近国际市场实际需求量. 　　……