路井凹陷的构造特征与油气远景分析

20世纪80年代末,路井凹陷(又称麻木鸟苏凹陷)开始成为油气勘探的目标。1995年,在额1井首次获得工业油气流,证实该凹陷具备油气生成聚集条件。随后钻探额2井、额3井,均遭失败。为了探索该区下一步的勘探方向,本文从凹陷的构造和沉积演化着手,重点研究了该区的生油层、储层的沉积相带特征和有利的油气聚集带。中下侏罗统大山口群和白垩系麻木鸟苏组为该区主要生油岩系;下白垩统额济纳组为良好储层;燕山运动早期和中期形成的各类局部构造圈闭,均可能成为油气聚集场所;桃西低凸起、麻二号和麻三号构造带是有利的油气聚集带。本文认为该区展示了良好的油气远景。     

Prognostics of PEM fuel cell in a particle filtering framework

Proton Exchange Membrane Fuel Cells (PEMFC) suffer from a limited lifespan, which impedes their uses at a large scale. From this point of view, prognostics appears to be a promising activity since the estimation of the Remaining Useful Life (RUL) before a failure occurs allows deciding from mitigation actions at the right time when needed. Prognostics is however not a trivial task: 1) underlying degradation mechanisms cannot be easily measured and modeled, 2) health prediction must be performed with a long enough time horizon to allow reaction. The aim of this paper is to face these problems by proposing a prognostics framework that enables avoiding assumptions on the PEMFC behavior, while ensuring good accuracy on RUL estimates. Developments are based on a particle filtering approach that enables including non-observable states (degradation through) into physical models. RUL estimates are obtained by considering successive probability distributions of degrading states. The method is applied on 2 data sets, where 3 models of the voltage drop are tested to compare predictions. Results are obtained with an accuracy of 90 h around the real RUL value (for a 1000 h lifespan), clearly showing the significance of the proposed approach.     

Characterisation of volatile compounds in Tunisian fenugreek seeds

In this study, we intend to develop a simple and fast analytical procedure to identify the volatile compounds implicated in the odour of Tunisian fenugreek (Trigonella foenum-graceum L.) seeds. Two procedures, solvent extraction and static headspace solid-phase microextraction (SHS-SPME), have been used under different conditions. The volatile compounds extracted were systematically identified using gas chromatography–mass spectrometry, based on their mass spectrum and Kovats index on two columns of different polarity. A total of 67 compounds were identified, some of them being reported for the first time in fenugreek seeds (e.g. several pyrazines, 2,5-dimethyl-4-hydroxy-3(2H)-furanone or 1-epi-cubenol). Methanol was found to be the preferred solvent for high and medium boiling point volatile compounds, such as sotolone and nitrogen compounds. For SHS-SPME, the fibre coated with divinylbenzene/carboxen/polydimethylsiloxane 2 cm was the most suitable for extracting volatile compounds from ground seeds. The efficiency of this fibre was confirmed by direct gas chromatography–olfactometry, with a global odour similar to that of fenugreek seeds.     

射流管电液伺服阀专题讲座

第三章射流管伺服阀的污染控制概述 现代的液压控制系统越来越多地采用伺服控制和比例控制阀,这些部件同制造过程和最终产品质量的控制密切相关,而保证液压流体的清洁度和化学成分是维持液压系统工作的关键,其中阀滤器的适当选取和工作环境影响清洁度,因此在过滤方面应对阀、阀的设计、回路布局以及工作环境加以认真考虑.如此,才能在多数恶劣的环境中获得高的可靠性和长的使用寿命.     

基于GPU计算平台的三维波动方程叠前深度偏移

GPU/CPU协同并行计算是一项全新的、具有革命性的技术,将对地震资料处理行业产生深远的影响。本文在充分发挥GPU存储带宽宽、多寄存器和多处理器结构特点的基础上,通过改进地震成像并行计算模块的核心函数,形成一套波动方程地震成像GPU高效并行算法,并取得理想的加速比和可扩展性。所形成的一套GPU/CPU平台下波动方程叠前深度偏移软件,已投入地震资料处理实际应用。理论模型试算和实际资料的处理验证了本方法的有效性和实用性。     

Comparison of health status, socioeconomic characteristics, and knowledge and use of HIV-related resources between HIV-infected women and men

OBJECTIVES: The authors compared socioeconomic characteristics, and knowledge and use of human immunodeficiency virus (HIV)-related resources and health status measures between HIV-infected women and men registered within the Denver Health and Hospitals health care system. METHODS: Data collected through two Centers for Disease Control-funded surveillance initiatives (Adult Spectrum of Disease and Supplement to HIV/AIDS Surveillance) were linked. Health status measures were obtained using the Medical Outcomes Study (MOS-20) questionnaire. To compare health status measures between genders, men were matched to women based on disease stage, intravenous drug use, race, years of education, employment status, and age. RESULTS: Among all patients interviewed (n = 419), women (n = 52) were more likely to be minority, uneducated, intravenous drug users, and at earlier stages of HIV-disease than men (n = 367). Employment status was not significantly different. Knowledge of available services was generally good among both genders. Women received public assistance and had health insurance (Medicaid) more often than men. Women used support services, social work, and shelter assistance less often than men. The matched pairs analysis (n = 46 pairs) showed no significant differences between genders in physical and social function, mental health, pain, or general health perceptions; however, role function was better in women than in men (P<0.02). CONCLUSIONS: When controlling for factors that may influence health and access to health care, HIV disease generally impacts the health status of both genders similarly. Women scored higher in role function which may reflect family caretakers' responsibilities. Although knowledge of HIV-related resources was similar by gender, men made contact more often suggesting areas for enhanced outreach toward women.     

NUMERICAL INVESTIGATION ON THE AEROELASTIC BEHAVIOR OF AN AIRSHIP WITH HULL-FIN CONFIGURATION

Numerical investigation was conducted on an airship of hull-fin configuration for aerodynamic and aeroelastic characteristics in three-dimensional viscous flows. The mathematical model was built and the corresponding numerical code was developed for the fluid-structure interaction problem. The governing equations of the viscous flow with LL-Low Reynolds modified model were solved by the standard SIMPLE algorithm based on the finite volume method. A fluid-structure coupled method was employed to solve the nonlinear aeroelasticity problem for the airship. The computational results of the viscous flow are in good agreement with the experimental measurements. The simulation on the aeroelastic behavior of the airship in a trimmed flight reveals the effect of structure flexibility on the aerodynamic performance.     

Orientation Relationships between Ferrite and Cementite by Edge-to-edge Matching Principle

The crystallographic features of pearlite were investigated by experiments and edge-to-edge matching principle. Two new orientation relationships between ferrite and cementite were determinated by selected area electron diffraction and then explained by our modified edge-to-edge matching method. The consistence of the experimental results with theoretical prediction confirms the practicability of the modified edge-to-edge matching model.     

碱性药芯焊丝的四种设计类型的比较

全面研究了药芯焊丝的碱性渣系,归纳出四种可能的设计类型,并对它们进行了比较研究。