智能变电站中预制舱式组合二次设备的运用

使用预制舱式组合二次设备,能够有效的缩短施工工期,土建工程与二次屏柜安装、接线可以同步开展,现场仅仅只需要安装预制舱就可以。随着国网标准配送式智能变电站建设的推进,预制舱式组合二次设备的运用将会越来越广泛。在文中分析了当前变电站二次系统建设现状进行了分析,并就预制舱式组合二次设备的优势及其布置方式进行了探讨。     

基于渗透检测的网络安全运维框架设计与实现

高效发现所运维网络及其应用的安全隐患,并及时部署相应的安全防护手段是网络安全运维的关键.针对日益频发的网络安全威胁,本文提出了一种便捷、规范且可扩展的网络安全运维框架,并设计开发了相应的运维工具.该框架能够充分利用最新的网络安全漏洞情报,定制化地对所管理网络资产开展漏洞扫描,进而及早确认漏洞分布情况,能较大程度地提高网络安全运维的效率.通过针对某校园网进行测试,所设计开发的工具表现出较高准确性和效率.     

用热处理方法收缩内孔超差零件

在机械加工或热处理时,零件内孔增大,超出设计要求,造成废品的现象时有发生。采用适当方法收缩内孔,使废品变成合格零件,对节约原材料,降低产品成本,提高经济效益具有重要意义。 生产实践证明,应力和塑性是金属材料产生变形的必要条件,应力越大,塑性越好的材料,变形也就越大。钢件无组织转变的情况下,加热后     

Synthesis and properties of nanocrystalline nonferrous metals prepared by flow-levitation-molding method

Nanocrystalline nonferrous metals （Cu, A1, and Ag） were synthesized by flow-levitation-molding method. The microstructure of the as-prepared nanocrystalline metals was characterized by XRD and FESEM. The microhardness and electrical resistivity were tested by the HMV-2 type Microhardness Tester and 6157 type Electrometer, respectively. The synthesis process was also studied. The results show that the spheriform particles in nanocrystalline metals have average grain size of 20-30 nm. The relative density of nanocrystalline Cu, A1, and Ag are 95.1%, 98.1% and 98.3%, respectively. The microhardness of nanocrystalline Cu, Al and Ag are 2.01, 2.11 and 1.26 GPa respectively, which are larger than those of their coarse-grained counterparts by the factor of 4.5, 14, and 2.5, respectively. The electrical resistivity of nanocrystalline Cu at room temperature is 1.5× 10^-7Ω.m, which is higher than coarse-grained Cu by a factor of 7.5. The pressure is the predominant factor influencing the density of the as-prepared nanocrystalline nonferrous metals.     

Influence of the Source to Substrate Distance on the Growth,Tribological Properties and Optical Properties of Be Films

The Be films were prepared by thermal evaporation at different sources to substrate distances (SSD) on glass substrates. The decrease of SSD from 90 mm to 50 mm caused the increase of substrate temperature and the rising density of incident Be atoms, thus the properties of Be films greatly changed accordingly. The experimental results showed that the grain diameter in the Be films transited from below 100 nm to 300 nm, the film growth rate increased from 2.35 nm/min to 4.73 nm/min and the roughness increased from 7 nm to 49 nm. The performance study suggested that the friction coefficient of Be films increased from 0.13 to 0.27 and was related to the surface roughness and inner structure, the near-infrared reflectance of Be films increased from 40% to 85% with the increase of wavelength and concurrently decreased with the decrease of SSD, respectively. The performance study indicated that the Be film had the potential application in specific near-infrared reflectance optical system.     

形成白云边酒风味特征的典型原核微生物菌系的研究

采用DGGE技术,对白云边酒酿酒工艺过程中的大曲、堆积发酵产物、酒醅和窖泥,以及酱香型和浓香型酒相应工艺中的原核微生物进行了分子水平分析.结果表明,不同香型的酒,存在着不同的原核微生物群落,每种样品都有其特有的优势原核微生物,其可能是影响着酒的香型.白云边酒整个工艺过程中的原核微生物种类和酱香型酒相近,但窖底泥的原核微生物种类比酱香型多,和浓香型酒的窖泥接近,可能是窖底原核微生物决定了兼香型白云边酒的浓香风格.     

油田含油污水生化处理系统快速启动技术

受油田含油污水高矿化度及其他生物抑制剂等条件的影响,微生物酶活性难以提高,抑制其生长,导致生化系统启动时间长甚至失败。因此对生物接触氧化法中微生物强化剂配方分析筛选,提高微生物对油田污水的耐受度,同时对挂膜工艺研究,确定合理的盐度增加速度,从而缩短生化系统启动时间,为现场系统启动提供基础设计参数。