中厚板十一辊热矫直机应用与研究

中厚板在生产的各个过程中会产生各种浪型缺陷,为了保证钢板的平直度,唐钢中厚板轧机加速冷却装置后设置了一台热矫直机,用于轧后及加速冷却后钢板的矫直。主要介绍了热矫直机的控制方式和控制特性,并对其中重要的控制功能进行了详述。通过对矫直机的控制,提高了钢板的平直度,满足了市场和用户对钢板的质量要求。     

济钢中厚板厂3000T热矫直机辊缝调整系统研究

通过分析3000T热矫直机辊缝调整装置,系统研究了3000T热矫直机辊缝调整功能的实现,为矫直机的在线使用提供了重要的参考依据。     

六辊矫直机噪声治理

六辊矫直机噪声治理何文趱，司志强，王滨之，李建伟，许新灵（杭州钢铁集团公司杭州钢铁集团公司安环处杭州钢铁集团公司无缝钢管厂）钢管厂矫直机扣瓦是（冷拨）无缝管进行矫直加工的重要设备之一。矫直机将无缝钢管限制在扣瓦内，以防止未被矫直部分钢管由于受矫直辊作...     

九辊中厚板热矫直机故障分析及解决方案

根据河北钢铁集团舞钢公司九辊中厚板热矫直机应用现状,重点分析了我厂热矫机经常出现的故障,最后经过对故障了分析,改进设备不完善方面,很好的解决了问题。     

矫直机换辊装置改造

介绍了矫直机更换辊系装置的改造方案及应用效果,实现了快速更换辊系。     

十九辊矫直机结构设计及调整要点分析

钢材作为支撑经济发展的重要基础性材料,在工业生产、房地产等各个行业都发挥着积极的作用。矫直机作为一种重要的金属塑形设备,能够实现对于金属棒材、管材以及线材等进行矫直作业。在钢铁的生产过程中,轧制出的钢材由于热膨胀、以及轧制设备所存在的误差等导致轧制后的钢材需要对其进行矫直以满足工业生产以及经济快速发展对于钢材等的精度的需求。本文将在分析矫直机的结构原理的基础上对十九辊矫直机的结构和参数等进行设计。     

矫直机辊系快速更换的探索与应用

通过对影响矫直机辊系快速更换的问题进行探索,解决了辊系更换过程中的制约因素,大幅降低了更换作业时间,实现了辊系的快速更换。     

机组参数在冷轧拉弯矫直机中的应用

通过对矫直机理的分析,并结合莱钢冷轧拉矫机现场调试经验,详细描述拉弯矫直机组主要参数确定方法。     

二辊滚光矫直机结构分析及力学模型建立

经济的快速发展促进了民众对于棒材的需求,同时为加快工作效率,对于棒材的加工精度也提出了更高的要求。本文将在分析矫直机工作原理的基础上对如何做好二辊滚光矫直机进行分析阐述。     

轧机液压辊缝控制系统的原理及应用

介绍邯宝公司2080冷轧酸轧联合机组轧机液压辊缝控制,通过分析HGC液压缸可以在位置控制模式和轧制力控制模式下运行的模式,由液压辊缝控制(HGC)系统调节轧机对带钢的压下量,直接影响到板型效果。     

基于随机Petri网的铜带拉弯矫直机可用度分析

为了合理确定铜带拉弯矫直机的校验周期,提高其生产效率,确保其矫直精度,根据某铜板带公司拉弯矫直机9个月的维修数据,对拉弯矫直机的失效模式进行随机Petri网建模,将系统失效模式转换成相应的随机Petri网;基于马尔科夫过程对随机Petri网进行瞬态概率求解,并得到该拉弯矫直机失效模式的稳态概率;利用或门对应的随机Petri网模型分析,计算不同校验周期下拉弯矫直机的可用度.综合考虑设备可用度和经济效益,确定了合理的校验周期,为拉弯矫直机的长周期运行提供了依据.     

Gap acceptance of violators at signalised pedestrian crossings

Gap acceptance of violating pedestrians was studied at seven stretches of signalised pedestrian crossings in Singapore. The provision of the traffic light signals provide a ‘safer’ crossing option to these pedestrians, as compared to uncontrolled crossings and mid-block arterial roads. However, there are still people choosing to cross at the riskier period (Red Man phase). The paper discusses about the size of traffic gaps rejected and accepted by pedestrians and the behaviour of riskier pedestrians (those adapting partial gap). The likelihood of pedestrians accepting gaps between vehicular traffic as a combination of different influencing independent variables such as traffic, environmental and personal factors was studied and modelled using logistic regression.     

速调管双耦合口输出回路间隙阻抗频率特性的计算

采用等效电路理论,建立了双耦合口输出腔间隙阻抗频率特性的冷测模拟计算方法。运用该方法,并借助CST-MWS三维电磁场计算软件,计算分析了某S波段单间隙双耦合口输出腔的间隙阻抗频率特性。结果显示,本方法与采用场分析法及散射曲线法得到的结果符合良好。     

X波段三间隙耦合腔型输出回路间隙阻抗的模拟计算

本文基于理论分析和数值模拟,对一个X波段重叠模工作的三间隙耦合输出回路进行了分析计算.讨论了总间隙阻抗与群时延之间的关系以及回路的群时延对总间隙阻抗的影响.通过合理优化群时延曲线,该X波段三间隙耦合输出腔在三模重叠的情况下获得了1dB输出带宽大于14.5%(约1.3GHz)的结果.     

三间隙耦合输出回路间隙阻抗频率特性的测量

从多端口微波网络等效的角度,讨论多间隙耦合输出回路间隙阻抗频率特性的测试问题,并以X波段三间隙耦合输出回路为例,分别从模拟测量和实际测量两个方面确定了其间隙耦合阻抗的频率特性,简化了测量过程,为三间隙耦合输出电路工程应用提供了有效的实验手段.     

Effect of Gap Size on Coating Extrusion of Pb-GF Composite Wire by Theoretical Calculation and Experimental Investigation

1.IntroductionContinuous fiber composite wire has been of great im-portance for its high market potential in recent decade.Lead-clad glass fiber(Pb-GF)composite wire can bewidely used in various fields,including grid plates in bat-teries for electric vehicles(EVs)and hybrid electric vehi-cles(HEVs),radiation protective grid plates and soundinsulation,due to its high tensile strength,good resis-tance to acid corrosion,sound electric conductivity,highdamping and radiation protection of lead[1…     

用空间电荷限制电流法测量非晶硅基薄膜的隙态密度

利用常规的层状结构的空间电荷限制电流法,测得了具有一定厚度 d 的 GD-a-Si_(1-x)C_x∶H 和 GD-a-Si_(1-x)N_x∶H 膜不同含量 x 时的隙态分布 N(E):对 GD-a-Si_(1-x)C_x∶H 膜(d(?)1μm),当 x 为0、0.1、0.8时,平衡费米能级附近处的隙态密度 N(E_(?)~o)分别为2×10~(15)、4×10~(15)、6.2×10~(16)/cm~3·eV,对 GD-a-Si_(1-x)N_x∶H 膜(d(?)1μm),当 x 为0、0.05、0.2时,N(E_F~o)分别为2×10~(15)、3×10~(15)、4.5×10~(16)/cm~3·eV;得到了 GD-a-Si∶H 膜的隙态分布与膜厚度的关系,发现随着膜厚度的增加 N(E_F~o)在减小,当 d<1μm 时,N(E_F~o)约为10~(16)/cm~3·eV 的数量级,当 d>1μm 时,N(E_F~o)约为10~(15)/cm~3·eV 的数量级。对共面电极结构的样品,用温度调制空间电荷限制电流法(TM-SCLC),测得了 GD-a-Si∶H 膜的隙态分布,并对光处理前后的样品进行比较,发现强光照后存在有光诱导效应。我们对所得结果作了初步说明。     

Admixture of an s-Wave Component to the d-Wave Gap Symmetry in High-Temperature Superconductors

Neutron crystal-field spectroscopy experiments in the Y- and La-type high-temperature superconductors HoBa₂Cu₃O_6.56, HoBa₂Cu₄O₈, and La_1.81Sr_0.15Ho_0.04- CuO₄ are reviewed. By this bulk-sensitive technique, information on the gap function is obtained from the relaxation behavior of crystal-field transitions associated with the Ho³⁺ ions which sit as local probes close to the superconducting copper-oxide planes. The relaxation data exhibit a peculiar change from a convex to a concave shape between the superconducting transition temperature T _c and the pseudogap temperature T ^* which can only be modeled satisfactorily if the gap function of predominantly d-wave symmetry includes an s-wave component of the order of 20–25%, independent of the doping level. Moreover, our results are compatible with an unusual temperature dependence of the gap function in the pseudogap region (T _c≤T≤T ^*), i.e., a break up of the Fermi surface into disconnected arcs.     

Effects of Butt Design and Gap Width on the Microstructure and Mechanical Properties of Magnesium Alloy Welds

The effects of parallel and angular butt designs with different gap widths on the microstructure and mechanical properties of the resultant magnesium joints in gas tungsten arc welding were investigated.The experimental results displayed that the tensile strength of the joint made with angular butt joint and 0.3 mm-wide gap reached 266 MPa,the joint fractured through the heat-affected zone or base metal during tensile testing,and the microstructure examination showed that no macropore appeared in the fusion zone.However,macropores in diameter of larger than 200 micron occurred for other joint designs,the tensile strength of the resultant joints decreased,and the joints fractured through the fusion zone during tensile testing.The fracture surfaces were examined by scanning electron microscopy and the microhardness distribution in the joints was measured by using a Vickers microhardness tester.     

热连轧精轧温度控制的自适应策略研究

分析了热轧带钢生产过程中在精轧机组各机架间的温度变化过程,考虑机架间水冷综合换热系数对终轧温度的影响,提出了针对水冷综合换热系数的自适应策略.在现场实测数据的基础上,编制了精轧温度控制模型系数自适应计算的离线模拟软件,预先设定虚拟的通条带钢温度实测值,检验模型自适应系数的变化及其对下一次同规格带钢温度计算值的影响.计算结果表明,在本文建立的模型自适应策略下,自适应系数针对不同的轧件温度实测值可以进行迅速而有效的变化,使计算值迅速逼近实测值,表明本文建立的自适应策略有效.