视地层水电阻率正态分布分析及应用

通过多组随机正态分布序列数据正态频率分布绘图分析，指出正态分布序列数据的方差值越大，即储层段的视地层水电阻率分布范围较大时，正态频率分布曲线的斜率就越大；反之，正态分布序列数据的方差值越小，即储层段的视地层水电阻率分布比较集中时，正态频率分布曲线的斜率就越小。实际数据显示P^1/2 值越大，含气性越好；水层段P^1/2 值小，斜率小；通过该方法计算的地层水电阻率与水分析资料显示一致。     

亚跨音速栅格的升阻特性数值研究

栅格几何参数对栅格翼的气动力特性影响很大,针对此问题,采用数值模拟方法研究了亚跨音速条件下栅格形状、翼弦格宽比对栅格升阻特性的影响.栅格形状主要为正置与斜置45°正方形、正六边形、正三角形等4种,翼弦格宽比变化范围为0.7～3.0.结果表明, 形状和翼弦格宽比对栅格阻力系数、升力系数、升阻比都有显著影响,存在使气动力特性最佳的形状和翼弦格宽比,为研究亚跨音速下栅格翼的气动特性提供了基础.     

介绍一种铝加工用新型UCF离心式净油器

介绍了新型UCF离心式系列净油器新结构工作原理与特点,例举了部分使用效果和数据。     

Rheological properties and gel characteristics of polysaccharides from fruit-bodies of Sparassis crispa

Rheological properties and gel characteristics of Sparassis crispa polysaccharides (SCPs) were investigated under various concentrations, temperature, pH, salt concentrations, and sucrose concentrations. SCP solutions behaved as shear thinning pseudoplastic fluids; apparent viscosity increased with concentrations but decreased with extreme conditions and was highest for 1% SCPs at 80 ℃ under neutral conditions; 5% SCPs solutions formed a hysteresis loop and exhibited thixotropic properties. By oscillatory measurements, SCPs were viscoelastic materials. 0.5% and 1% SCPs solutions exhibited viscous behavior at low frequency and enhanced elastic property with the oscillation frequency increased. With the concentration increased to 3% and 5%, the elastic property was predominant in solutions and exhibited gel-like behavior. SCPs gel textural properties and water holding capacity increased with concentration (to 20%) and decreased with salinity, extreme sucrose, and pH. 10% SCPs gels were optimized at 10% sucrose in neutral conditions. Thus, these results implied SCPs had the potential utilization as a new hydrocolloid source in food industries.     

基于缸孔珩磨表面微观特征的质量检测模式与提升监控水平的探索

分析了缸孔珩磨表面微观构造对汽车发动机性能产生极大影响的原因,指出对珩磨表面平台网纹形貌进行质量检测的重要性。强调了随着机动车节能和减排法律法规的日趋严苛,企业在质量监控方面也应持续完善提高,并对近年来在该领域的技术进展进行了介绍。     

沟槽结构对水润滑轴承润滑特性影响机制

为了研究沟槽结构对船用水润滑轴承润滑特性的影响机制，采用有限元法，通过对简化后的椭圆形沟槽的二维模型进行流体动力学CFD分析，从迹线以及涡流等方面分析沟槽结构参数对沟槽内部流体特征的影响，得到不同状态下沟槽内部的压力轮廓，并分析沟槽结构参数对水润滑轴承摩擦因数的影响和轴承的润滑机制。结果表明：沟槽的大小影响轴承间隙内流体的流通面积，沟槽的结构特征影响沟槽内的流体黏度。研究结果可为水润滑轴承优化设计提供参考。     

Study of traffic characteristics based on internet web real-time traffic conditions by image identification technology

With the rapid development of Internet, it is increasingly convenient to obtain real-time traffic condition information, which has greatly stimulated the improvement of urban traffic guidance. Traffic conditions are generally divided into four grades in the existing network platform, which are expressed in different colours. The understanding of traffic condition is still at the level of abstract senses. Therefore, it is difficult to grasp the characteristics of urban traffic. To this end, a new idea is proposed in this paper, and the new idea is to study the urban traffic characteristics based on real-time traffic condition information extraction with image identification technology. With this method, we can not only quantify the abstract traffic condition information, but also solve the loss of traffic condition information. In addition, an instance is analysed in this paper, it shows that it can provide references for urban traffic organization management very well.     

Antibacterial mode of action of seed essential oil of Eleutherococcus senticosus against foodborne pathogens

This study investigated the antibacterial mechanism of action of the seed essential oil of Eleutherococcus senticosus (ESEO) against foodborne pathogenic bacteria. Preliminarily, the ESEO (1000 μg disc^?1) showed potential antibacterial effect as diameter of inhibition zones (12.0 ± 0.2–37.0 ± 2.0 mm) against the tested foodborne pathogens. The MIC and MBC values of ESEO against the tested bacteria were found in the range of 125–500 and 500–1000 μg mL^?1, respectively. At MIC concentration, the ESEO had potential inhibitory effect on the cell viability of the tested pathogens. In addition, SEM analysis showed the inhibitory effect of ESEO as confirmed by considerable morphological alterations on the cell wall of B. cereus ATCC 13061 and E. coli O157:H7 ATCC 43889. Moreover, the ESEO revealed its mode of action against foodborne pathogens on membrane integrity as confirmed by release of extracellular ATP, 260‐nm absorbing materials and leakage of potassium ions. These findings confirm that the ESEO can be used as a potential antibacterial agent in food industry to inhibit the growth of various foodborne pathogens.     

500 kV GIS及罐式断路器分合闸时间测试结果探讨

对于目前500 kV GIS及罐式双断口断路器分合闸时间测试方法只能得出一个断口时间结果的实际情况,指出并不能完全反映断路器整个机构的工作状态,并提出比较多次断路器分合闸时间的方法,通过历史数据的变化来考察断路器两个断口的实际工作状态。     

Indication to distinguish the burst region of coal gas from seismic data

The velocity of an over-burst coal seam is about 1/3 compared to a normal coal seam based on laboratory test results. This can be considered as a basis to confirm the area of coal and gas burst by seismic exploration technique. Similarly, the simulation result of the theoretical seismic model shows that there is obvious distinction between over-burst coal and normal coal based on the coal reflection’s travel-time, energy and frequency. The results from the actual seismic data acquired in the coal and gas over-burst cases is consistent with that of the laboratory and seismic modeling; that is, in the coal and gas burst region, seismic reflection travel time is delayed, seismic amplitude is weakened and seismic frequency is reduced. Therefore, it can be concluded that seismic exploration technique is promising for use in distinguishing coal and gas over-burst regions based on the variation of seismic reflection travel time, amplitude and frequency. Supported by the Key Program of National Basic Research Program(973) of China (2006CB202208); the CBM Important Project of 2008ZX05040-003 in China