频谱分析仪在测量过程中的优化使用

为了在测量中高效使用频谱分析仪,需要对其进行优化设置。主要阐述了如何在测量过程中根据测试目的优化设置频谱分析仪相关参数和状态,以获得高的测量精度、快的测量速度和大的动态范围从而达到优化使用频谱分析仪、提高测量效能的目的。     

LG气田三维应急地理信息系统的建设

中国石油西南油气田公司作业区较为分散,区域内人口密度大,生产场站远离公司机关。因此各级管理部门快速了解突发事件现场情况,正确判断事态发展,科学利用周边应急资源,对保障油气田安全平稳生产意义十分重大。为此,开展了LG气田试采工程三维应急地理信息系统建设。2009年11月利用该系统在LG气田开展了大型多方应急演练。演练结果表明,该系统按建设方案实现了现场应急监控、数据传输、应急方案制订、疏散线路规划、应急力量整合以及应急资源调配等功能。该系统是LG气田应急体系的重要组成部分,主要针对气田突发事件应急反应和日常应急事务管理而开发研制,除具备区域地理信息外,还包含有环境敏感区数据库、应急救援力量数据库和事故后果模拟模型库等,具有预测突发事件后果和在人机交互情况下模拟处理突发事故等功能。该系统已正式投入使用。     

气象气球爆破性能与升空性能的相关性研究

通过研究气象气球地面爆破性能与高空爆破性能数据之间的关系,分析不同硫化程度生产工艺、高空的温度和湿度、高空气压对气球高空爆破性能的影响,从而得出气球地面爆破直径和气球施放高度的相互关系。     

鸭溪电厂输灰不畅原因分析与处理

针对贵州鸭溪电厂气力输灰不畅原因及带来后果进行了全面仔细分析,找到了解决问题根源的有效方法,不仅为机组安全经济运行提供了有力保证,而且为节能降耗、美化环境起到积极的推进作用。     

接地与电气安全探讨

接地是电力系统中不可缺少的电气安全技术。接地是否合理,不仅影响电力系统的正常运行,而且也影响到人身安全。正确的接地方式和安全的接地装置,是保证电气安全的重要措施。     

(Cu50Zr50)92Al8块体非晶合金高温塑性变形过程中的晶化行为

采用水冷铜模吸铸法制备直径2mm的(Cu50Zr50)92Al8块体非晶合金。利用X射线衍射(XRD)、差示扫描量热分析仪(DSC)对该非晶合金的结构及热力学参数进行表征。利用万能试验机在过冷液相区内对该非晶合金进行压缩变形,研究变形量(20%,60%和80%)对非晶合金显微结构和热稳定性的影响。结果表明,塑性变形使得该非晶合金的热稳定性降低,并导致其部分晶化,其晶化程度取决于合金的变形量的大小,当变形量为80%时,该合金的XRD图谱中出现了明显的晶化峰。晶化相的析出使得变形后的非晶合金的显微硬度有明显提高。     

Microstructure and mechanical properties of graphitic a-C:H:Si films

A series of graphitic a-C:H:Si films with different Si content were prepared by altering the sputtering current in a hybrid RF-PECVD and magnetron sputtering system. Microstructures and mechanical properties of them were characterized by IR, Raman, XPS, nanoindentation and scratch tests. Results show that although the sp³/sp² ratio increases with increasing Si content and as high as 8.2 at.% of silicon was doped, the a-C:H:Si films remain graphitic in nature and the I_D/I_G ratio is nearly constant for all. The coupling effects of sputtering-induced heating and strong ion bombarding due to negatively biasing were considered to be responsible for the film graphitization. The graphitic nature also accounts for the lower nanohardness of prepared a-C:H:Si films than the diamond-like a-C:H and a-C:H:Si films.     

Microstructure and magnetic properties of (0 0 1)-oriented L10 FePt films: Role of Ag underlayer and Fe/Pt ratio

FePt multilayer films were deposited on Si(1 0 0) substrate with thermally grown SiO₂ film and sputtered Ag underlayer at room temperature by dc magnetron sputtering and subsequently annealing in vacuum. Experimental results suggest that proper thickness of Ag underlayer and slightly rich of Fe content can effectively induce the (0 0 1) texture of FePt films. A Fe_57.4Pt_42.6 thin film on the 8 nm Ag underlayer exhibits a large perpendicular coercivity of 7.6 kOe with magnetic remanence close to 1.     

Compressive Viscoplastic Response of 6082‐T6 and 7075‐T6 Aluminium Alloys Under Wide Range of Strain Rate at Room Temperature: Experiments and Modelling

Abstract: In this work, the viscoplastic behaviour of 6082‐T6 and 7075‐T6 aluminium alloys is examined over a wide range of strain rates. Three different testing techniques were applied to this investigation: low‐rate experiments were performed using a regular servo‐hydraulic testing machine, high‐rate tests were conducted using a split Hopkinson bar apparatus and very‐high‐rate experiments were carried out using a miniaturised direct impact test arrangement. The latter testing set‐up allowed for the characterisation of material flow at strain rates up to . These experimental results showed a sharp increase in the rate sensitivity of the materials once a threshold loading rate of is exceeded. This behaviour may be attributed to the presence of viscous drag on high‐velocity dislocation motion. In addition, the thermo‐viscoplastic behaviour of the 6082‐T6 and 7075‐T6 aluminium alloys was analytically described using the extended Rusinek–Klepaczko model of viscous drag effects. Satisfactory correlation was observed between the experiments and the constitutive model results over the entire range of strain rates studied,      

Preparation of lipid aspirin sustained-release pellets by solvent-free extrusion/spheronization and an investigation of their stability

A novel solvent-free extrusion/spheronization technique was investigated for preparing stable aspirin sustained-release pellets. Lipids as binders and the matrix in this technique were extruded below their melting points, and spheronized in a thermomechanical process. Four types of lipids (adeps solidus, Compritol(?) 888 ATO, Precirol(?) ATO5 and Compritol(?) HD5 ATO) and their admixture in different ratios were used to obtain spherical and extended-release pellets. Pellets containing 80% aspirin, 15% adeps solidus and 5% Compritol(?) 888 ATO had the best spherical geometry and met the dissolution requirements of aspirin extended-release tablets in USP 31. Storage stability studies showed that the content of free salicylic acid increased sharply in the traditional pellets produced by wet extrusion/spheronization, from 1.91 to 7.84%, whereas there was little increase in the lipid pellets (from 0.48 to 1.08%). The dissolution rate from the optimal pellets (F11) stored at 26°C did not change, but became faster at 40°C/RH75% after 5 months. Powder X-ray diffraction, scanning electron microscopy (SEM) and differential scanning calorimetry were used to investigate the physical properties of the pellets during stability testing. The increase in the rate of drug release from aged pellets (40°C/RH75%) may result from the partially melted adeps solidus observed in SEM photographs. This study suggests that it is possible to prepare sustained-release pellets by solvent-free extrusion/spheronization using an appropriate mixture of lipids with high stability. In particular, this novel technique is excellent for hygroscopic drugs.