惠民凹陷中央隆起带西端复式油气成藏特征

惠民凹陷中央隆起带由于构造的复杂性和多物源等条件 ,中央隆起带西端勘探难度较大。运用三维地震资料 ,结合临区地质分层 ,对该区进行了综合地质研究 ,详细分析了该区的地层和沉积特征 ,构造面貌和油气成藏条件。研究表明 ,该区发育背斜油气藏、断块油气藏、构造 -岩性油气藏及地层不整合油气藏等多种油气藏 ;油藏纵向上从沙三段—沙一段都有分布 ,平面上由南向北油气藏的层位依次抬高 ,全区各层位油气藏叠合连片构成复式油气藏。并指出下一步勘探的方向。     

黄铜矿原地氨浸的研究

美国矿务局研究人员正在按今后原地浸出的条件，对黄铜矿的氨／氧浸出进行研究。在某篇评述性文献中指出两个主要问题：（１）提供充足的氧化剂可以推进浸出反应；（２）由于在矿物表面形成一层Ｆｅ２Ｏ３的反应产物，故会降低浸出动力学。初步性能研究在２Ｌ、充分搅拌的高压釜中进行，包括自动取样及数据采集，利用统计实验设计确定了从较纯黄铜矿样品中浸出铜的最重要参数，即温度、氧化剂浓度、氢氧化铵浓度、以及温度与氢氧化铵浓度之间的相互制约作甩。结果表明，为了评估氧化剂进人原地矿体的情况，需要作进一步的研究工作；并表明，添加某些有机化合物（例如单糖、聚乙烯醇）至少能使溶液中已反应的某些铁得以稳定，从而减少由于Ｆｅ２Ｏ３包裹作用造成的钝化作用。为了确认这种方法的实用效果，已研究了几种类型的有机添加剂、添加剂对铁较合的程度以及控制螯合铁的一些方法。     

Advanced concepts flight simulation facility

The cockpit environment is changing rapidly. New technology allows airborne computerised information, flight automation and data transfer with the ground. By 1995, not only will the pilot's task have changed, but also the tools for doing that task. To provide knowledge and direction for these changes, the National Aeronautics and Space Administration (NASA) and the Lockheed-Georgia Company have completed three identical Advanced Concepts Flight Simulation Facilities.

Many advanced features have been incorporated into the simulators — e g, cathode ray tube (CRT) displays of flight and systems information operated via touch-screen or voice, print-outs of clearances, cockpit traffic displays, current databases containing navigational charts, weather and flight plan information, and fuel-efficient autopilot control from take-off to touchdown. More importantly, this cockpit is a versatile test bed for studying displays, controls, procedures and crew management in a full-mission context. The facility also has an air traffic control simulation, with radio and data communications, and an outside visual scene with variable weather conditions. These provide a veridical flight environment to evaluate accurately advanced concepts in flight stations.     

陶瓷磨光弧面板的开发与应用

研究了陶瓷板材在各种温度及压力下产生的应力、应变与板材断裂之间的关系和规律,提出了陶瓷板材的弯曲方法,研制各种专用试验、生产设备,将成品陶瓷平板加工成为园柱板、弧面、球面、圆锥面、双曲面等各种曲面板.     

我国拟在南极地区建立遥感卫星接收站

国家卫星海洋应用中心、国家海洋环境预报中心主任蒋兴伟透露．我国拟在南极地区建立遥感卫星接收站．以完善我国海洋卫星应用体系．从而进一步加强对全球海洋环境的实时监测．为我国应对全球气候变化提供数据支持。     

基于熵权未确知测度模型的烟气脱硫技术综合评价

在燃煤电厂建设中,评估、筛选出一种环境、技术、经济三方面都较理想的烟气脱硫技术很重要。在综合分析6种典型烟气脱硫技术基础上,建立了熵权未确知测度评价模型。首先,确定了烟气脱硫技术的单指标未确知测度矩阵;其次,利用熵权计算得到各指标权重;再次,确定了多指标综合测度;最后,通过置信度识别准则对6种烟气脱硫技术进行了评价等级划分,通过量化得分对其进行了优劣排序,这样可以得到最理想的烟气脱硫技术。实证表明,基于熵权未确知测度的评价模型可以客观、有效地对燃煤电厂烟气脱硫技术进行综合评价。     

Quantitation of the human basal ganglia with positron emission tomography: a phantom study of the effect of contrast and axial positioning

The accurate measurement of the concentration of a radioisotope in small structures with positron emission tomography (PET) requires a correction for quantitation loss due to the partial volume effect and the effect of scattered radiation. To evaluate errors associated with measures in the human basal ganglia (BG), a unilateral model of the BG has been inserted in a 20-cm cylinder. The recovery coefficient (RC=measured activity/true activity) for the BG phantom has been measured on a CTI tomograph with different background concentrations (contrast) and at different axial locations in the gantry. The BG was visualized on four or five slices, depending on its position in the gantry and on the contrast used. The RC was 0.75 with no background (contrast equal to 1.0). Increasing the relative radioactivity concentration in the background increased the RC from 0.75 to 2.00 when the contrast was -0.7 (BG相似文献   

Age is more than just a number: implications for an aging workforce in the US transportation sector

The US workforce is aging. At the same time, there are a record number of open positions in the transportation sector, which has traditionally been a well-paying, but stressful and schedule-dependent, occupation. Due to increasing longevity, need, and ability to work, a possible solution to the transportation workforce shortfall may lie within the retention and recruitment of older workers. This paper uses a socio-technical framework to examine the pertinent, though scant, literature and data related to older workforce demographics and operational needs, the regulatory environment, requisite knowledge, skills and abilities, and application of support technology and training. Although there is evidence of age-related changes in physiology and cognition, the current science remains unable to resolve how an older workforce may most appropriately be applied to transportation to maximize system safety and minimize negative impact to worker well-being.