极软岩矿井巷道优化设计

根据小康矿的煤层赋存状况及自然地质条件 ,围绕极软岩矿井巷道设计优化的问题进行了研究和实践。     

利用微生物吞吐技术开采稠油、特稠油

冷家油田冷43块S1+2油层稠油属特稠油,50℃脱气原油粘度在10 000mPa@s以上.通过优选的假单胞菌L1,LH-18与短杆菌HY-21对冷43块8口油井进行吞吐试验,共增产原油947t.单井最长有效期超过6个月,最高增产原油280t.该研究拓宽了微生物采油在稠油油藏中应用范围,为稠油、特稠油的转换开发方式提供了一条新途径.     

Experimental study of the Relaxation Phenomena in Non-Equilibrium MHD Generator Duct

The non-equilibrium electrical conductivity and the relaxation of electron density in seeded plasma for MHD power generators were studied experimentally. The experiments were performed with use made of potassium seeded argon plasma (A+0.14%K) at 1,800°2,000°K, flowing in a rectangular duct at constant velocity (about 240m/sec) under atmospheric pressure. The dependence of the electrical conductivity on the electric current density was found to agree well with theoretical prediction based on the two-temperature model, if a value of 40 was chosen for the collision loss parameter. The effect of the radiative energy loss of potassium atoms was not significant in the present experiments. Furthermore, it was found that the relaxation of the electron density can be well expressed by the recombination coefficient for the electronic three-body recombination processes, and that the relaxation time is about 4 × 10⁴ sec for the present experimental conditions.     

DISSIPATION OF WAVE ENERGY ON VERY MILD SLOPE

1.　INTRODUCTIONOffshoreareasarewherepeoplefrequentlyengagevariouskindsofhumanactivities,forexamples,portbuilding.seawallconstruction,installationofoildrillingplatformandseashorepowerstation,etc.Whenstructuresplacedinshallowwateraredesigned,thedesignwaveheightalwaystakesthecriticalwaveheight-breakingwaveheight.ThecriticalwaveheightadoptedinChineseCodeisdeterminedbyGoda′smethod,whichiswidelyusedinmanycountries.Thismethodisbasedonthestudyofregularwavesonbottomslopei≥1/50.Themaximumwavehe…     

Process and device modeling for VISI

The appearance of Very Large Scale Integration caused a pronounced interest in concentrating on process and device modeling. The fundamental properties which represent the basis for all device modeling activities are summarized. The sensible use of physical and technological parameters is discussed and the most important physical phenomena which are required to be taken into account are scrutinized. The assumptions necessary for finding a reasonable trade-off between efficiency and effort for a model synthesis are recollected. Methods to bypass limitations induced by these assumptions are pin-pointed. Formulae that are applicable in a simple and easy way for the physical parameters of major importance are presented. The necessity of a careful parameter-selection, based on physical information, is shown. Some glimpses on the numerical solution of the semiconductor equations are given. The discretisation of the partial differential equations with finite differences is outlined. Linearisation methods and algorithms for the solution of large sparse linear systems are sketched. Results of our two dimensional MOSFET model — MINIMOS — are discussed. Much emphasis is laid on the didactic potential of such a complex high order model.     

超高强混凝土基本力学性能的研究

对100MPa以上混凝土的强度发展特征、轴心抗压强度、弹性模量、劈裂抗拉强度等一些基本力学性能进行了试验研究，并将实验数据和其他研究者的实验数据进行了比较。结果表明，不同研究的数据之间，以及它们与我国现行规范之间都有较大差异。高强和超高强混凝土力学性能的数据还需大量积累。     

A very large-scale switching system by using nested ring-based architecture

In recent years, network applications and hardware technology have been developed in impressive speed. That is, a large-scale network switching system is needed to satisfy all demand among network service providers and population, such as data, voice, image, video on demand, videoconferencing, telecommunications, remote control and teaching, etc. A general large-scale network switching system cannot fulfill various application needs, such as the correctness of data transmission and the capacity of extension for input/output port of switching system. In this paper, we propose a nested ring-based architecture to build a very large-scale network switching system. In order to satisfy the various network application needs, a nested ring-based architecture is designed as a switching element. It can make input data exchange fast to the destined output port, and input/output port of switching system can easily be extended up to 100 ports or 1000 ports to construct a very large-scale network switching system. The simulation results show that a better performance can be achieved in data transmission, delay, throughput and extensibility for the proposed system.     

Relationship between satellite-derived land surface temperatures, arctic vegetation types, and NDVI

Arctic vegetation distribution is largely controlled by climate, particularly summer temperatures. Summer temperatures have been increasing in the Arctic and this trend is expected to continue. Arctic vegetation has been shown to change in response to increases in summer temperatures, which in turn affects arctic fauna, human communities and industries. An understanding of the relationship of existing plant communities to temperature is important in order to monitor change effectively. In addition, variation along existing climate gradients can help predict where and how vegetation changes may occur as climate warming continues. In this study we described the spatial relationship between satellite-derived land surface temperature (LST), circumpolar arctic vegetation, and normalized difference vegetation index (NDVI). LST, mapped as summer warmth index (SWI), accurately portrayed temperature gradients due to latitude, elevation and distance from the coast. The SWI maps also reflected NDVI patterns, though NDVI patterns were more complex due to the effects of lakes, different substrates and different-aged glacial surfaces. We found that for the whole Arctic, a 5 °C increase in SWI along the climate gradient corresponded to an increase in NDVI of approximately 0.07. This result supports and is of similar magnitude as temporal studies showing increases of arctic NDVI corresponding to increases in growing season temperatures over the length of the satellite record. The strongest positive relationship between NDVI and SWI occurred in partially vegetated and graminoid vegetation types. Recently deglaciated areas, areas with many water bodies, carbonate soil areas, and high mountains had lower NDVI values than predicted by SWI. Plant growth in these areas was limited by substrate factors as well as temperature, and thus is likely to respond less to climate warming than other areas.     

军事用途的图象甚低码率传输的研究

针对军事图象的特点采用了离散余弦变换及类RLE编码相结 合的方案,对军事静止图象的传输作了研究。实验结果表明此方案在保持军事目标清晰的前 提下,能达到10倍以上的压缩效果;在波特率为9 600的情况下,可在30s内传输一幅图象, 基本满足实时性要求。     

超大规模数字系统控制器的验证实现

数字系统的验证是一个复杂的过程。结合当前数字电路设计的高复杂度、高度集成化的特性,介绍了模拟验证和形式验证两种验证方法,并对它们进行了分析与比较,然后详细介绍了基于STG图同构求解的控制器综合验证方法。该方法需要两组有限状态机的STG(状态转换图),通过验证两个STG是否同构来验证控制器综合结果的正确与否。实践表明该方法可以有效地克服算法级描述到底层实现之间跨度太大的问题。