矿用输送带纵撕图像检测和纵撕故障识别方法

矿用输送带是当前最经济的矿用运输手段,但因为矿用输送带长时间处于较高荷载的运输状态和故障事故的频发,导致输送带经常出现纵向撕裂的事故,给矿企造成许多经济损失。本文概述了造成矿用输送带纵撕现象的原因,讨论了图像阈值法分割技术的应用。     

针对砂泥岩薄互层地层的测井资料标准化处理新方法

测井资料标准化是油藏描述中必不可少的基础工作,是实现由单井解释到多井评价的关键。然而在砂泥岩薄互层地层中由于缺少有效的标准层,常规的测井资料标准化方法难以有效实施。首先针对目标地层开展首次的快速标准化处理,然后通过神经网络等技术判断出纯泥岩的目标测井曲线特征,再针对所识别的泥岩曲线开展二次精细标准化处理,获得最终的标准化校正量。通过实际资料测试,该方法提高了标准化精度,能够满足勘探需求。     

工件碱性镀锡后焊接性差的原因分析

针对碱性镀锡零件在装配过程中出现的焊接性差问题进行原因分析,并通过焊接实验使问题再现。结果表明,锡条阳极、中间镀层和锡层厚度是影响碱性镀锡工件焊接性的主要因素,中和工序和贮存时间则为次要因素。为制得具有良好焊接性的镀锡零件,电镀时应选用符合标准的锡条阳极,根据基体材料选择中间镀层,并且镀锡层厚度应在5μm以上。     

复方七芍降压片对自发性高血压大鼠肠系膜动脉中Ⅰ、Ⅲ型胶原蛋白表达及血压的影响

目的:探究复方七芍降压片对自发性高血压大鼠（SHR）血压及血管重塑的作用机制。方法:SHR大鼠随机分为模型组、厄贝沙坦片组、复方七芍降压片组,每组10只,另设10只WKY大鼠为正常对照组,给药6周,无创血压仪测量各周大鼠血压变化;HE染色观察大鼠肠系膜动脉病理变化并测量管壁厚度、血管中膜厚度及相同位置的管腔直径,比值记为WT;免疫组化法检测肠系膜动脉中基质金属蛋白酶-2（MMP-2）及Ⅰ、Ⅲ型胶原蛋白（COⅠ、COⅢ）表达情况。结果:给药6周后,与正常对照组比较,模型组大鼠各周血压均明显升高（P<0.01）,管壁厚度及WT值增高（P<0.01或P<0.05）,肠系膜动脉中MMP-2及Ⅰ、Ⅲ型胶原蛋白表达均明显升高（P<0.01）;与模型组比较,复方七芍降压片组大鼠各周血压均明显降低（P<0.01）,管壁厚度及WT值降低（P<0.05）,肠系膜动脉中MMP-2及Ⅰ、Ⅲ型胶原蛋白表达均明显降低（P<0.05）,且病理变化得到改善。结论:复方七芍降压片具有降低SHR大鼠血压,改善血管重塑的作用,其机制可能与降低MMP-2表达及Ⅰ、Ⅲ型胶原蛋白沉积有关。     

HL-HGM高强无收缩灌浆料性能及其应用实践

HL-HGM高强无收缩灌浆料是一种高强度、无收缩、流动性大的灌浆材料,本文研究了不同水料比对灌浆料的流动度、泌水率、凝结时间、强度等性能的影响,简要介绍了产品在杭州湾跨海大桥50m简支箱梁支座安装中的应用,与环氧树脂砂浆灌浆相比,具有施工工艺简单,施工进度快,工程质量高,节约成本,环保等特点。     

ISO14000标准在供水企业中的实施——以广州开发区供水管理中心为例

本文通过对广州开发区供水管理中心现状的分析,提出了实施ISO14000标准环境管理体系的重点和步骤,最后提出了在供水企业实施ISO14000环境管理体系的一些建议。     

Design of the poloidal field system for KTX

The design of the poloidal field (PF) system includes the ohmic heating field system and the equilibrium (EQ) field system, and is the basis for the design of a magnetic confinement fusion device. A coupling between the poloidal and plasma currents, especially the eddy current in the stabilizing shell, yields design difficulties. The effects of the eddy current in the stabilizing shell on the poloidal magnetic field also cannot be ignored. A new PF system design is thus proposed. By using a low-μ material (μ=0.001, ε=1) instead of a conductive shell, an electromagnetic model is established that can provide a continuous eddy current distribution on the conductive shell. In this model, a 3D time-domain problem with shells translates into a 2D magnetostatic problem, and the accuracy of the calculation is improved. Based on these current distributions, we design the PF system and analyze how the EQ coils and conductive shell affect the plasma EQ when the plasma ramps up. To meet the mainframe design requirements and achieve an efficient power-supply design, the position and connection of the poloidal coils are optimized further.     

Simulation of Multi-Steady States in Low Temperature Gas Discharge

This article presents hydrodynamics simulation of multi-steady states and mode transition by DC-beam-injected gas discharge, and provides a model approach to hysteresis and distinct forms of multi-steady states. The critical transition conditions of the three discharge modes (temperature limited mode, Langmuir mode, and space charge limited mode) are estimated to be dependent on the gas pressure and the filament temperature. Various forms of the multi-steady states in gas discharge can be uniformly explained by the displacement of the mutant positions.The simulation results are in a good agreement with those of the experiments.     

运用法律手段开展电费回收的思考

电费回收是供电企业的一项核心业务,是供电企业实现经营成果的最终环节,也是企业经营成果的最重要体现。但南于电能“产、供、销、用”同时进行的特殊性,以及长期沿袭的“先用电、后交费”的交易习惯,使得供电企业在经营活动中不得不要承担客户用电后不按期按约缴费、拒绝逃避缴费或丧失偿债能力等电费风险。