Vogel型IPR的解析推导

１９６２年，Ｖｏｇｅｌ基于数值模拟结果，提出了一种溶解气驱油藏井底流压与产量的经验关系（ＩＰＲ），其关系式为：ｑｏ／ｑｏｍａｘ＝１－０．２Ｐｗｆ／Ｐｒ－０．８（Ｐｗｆ／Ｐｒ）＾２该式对岩石及流体特征的适用范围较广，同时，由于其使用方便，且能够满足工程粗度要求，因而获得了广泛应用。本文以多相流系统的物理特征为基础，提出了Ｖｏｇｅｌ型ＩＰＲ的理论基础。文中由多相流方程的Ｔａｙｌｏｒ级数展开获得ＩＰＲ解     

海军新的标准数字信号处理机:AN/UYS-2

与AN/UYS-2多处理机数字信号处理机结构摘要一起提出的是处理机中使用的主要技术的简要描述。讨论集中在为取得异常高的计算信息吞吐速度而采取的数据流并行处理方法的实现。另外,也讨论了它的功能部件以及采用标准电子模块实现其硬件功能元件。支援这种多处理机结构的是称作处理图解法(PGM)的一种信号处理图形语言方法,它用来为AN/UYS-2有效地和合算地编程序。最后突出了可用于AN/UYS-2的下一代的可供选择的技术。     

澳大利亚坑采煤矿瓦斯的排放

澳大利亚坑采煤矿瓦斯的排放ＭｉｃｈａｅｌＬ．Ｏｇｉｌｖｉｅ在过去的十年中，坑采煤矿在澳大利亚煤炭总产量中所占的份额呈下降趋势，其产量仅保持在５３００万ｔ左右。但由于该国采用了现代化的长壁采矿系统，地下煤矿采矿业已成了一个可发展的工业。在１９９３～１９...     

Integration of data systems and technology improves research and collaboration for a superfund research center

Large collaborative centers are a common model for accomplishing integrated environmental health research. These centers often include various types of scientific domains (e.g., chemistry, biology, bioinformatics) that are integrated to solve some of the nation's key economic or public health concerns. The Superfund Research Center (SRP) at Oregon State University (OSU) is one such center established in 2008 to study the emerging health risks of polycyclic aromatic hydrocarbons while using new technologies both in the field and laboratory. With outside collaboration at remote institutions, success for the center as a whole depends on the ability to effectively integrate data across all research projects and support cores. Therefore, the OSU SRP center developed a system that integrates environmental monitoring data with analytical chemistry data and downstream bioinformatics and statistics to enable complete "source-to-outcome" data modeling and information management. This article describes the development of this integrated information management system that includes commercial software for operational laboratory management and sample management in addition to open-source custom-built software for bioinformatics and experimental data management.     

Healthcare industry to benefit from 'Baby Bell' court ruling

Courts have cleared the way for regional Bell operating companies to sell electronic information. Although critics are fearful of the Baby Bells' power, others say the decision will open a myriad of possibilities that could have far-reaching effects on the healthcare industry.     

Quantitative ECT: Comparison of Recovery Coefficient and Linearity of Detector Response for Single Photon and Coincidence Detection (F-18, B+ 511 keV)

The response characteristics of two tomographic systems were compared for imaging of positron emitters: a) a SPECT system with a 3/8 in crystal and 511 keV detector shielding, equipped with a specially designed 511 keV collimator, and b) a PET V system using coincidence detection. SPECT transverse plane resolution was 19 mm FWHM and 35 mm FWTM for a radius of rotation of 16 cm. Corresponding resolution for PET was 14 mm FWHM and 28 mm FWTM. Transverse images through a phantom containing cylindrical sources of various cross sections and uniform activity were obtained for each detector. The measured count density or recovery coefficient was found to decrease with source size, the dependence being similar for both systems. The theoretical values for recovery coefficients were calculated by convolution of a Gaussian fit to the SPECT resolution (FWHM, FWTM) values with the uniform cross section of each source. This simple mathematical model confirmed that the recovery coefficient dependence on source size was primarily related to the limited resolution of the detector. Experimental measurements demonstrated that the SPECT resolution for volume sources was sufficient for quantitation, although some limitations exist with respect to source sizes smaller than the detector resolution.     

Effect of iridoid glycoside content on oviposition host plant choice and parasitism in a specialist herbivore

The Glanville fritillary butterfly Melitaea cinxia feeds upon two host plant species in Å land, Finland, Plantago lanceolataand Veronica spicata, both of which produce iridoid glycosides. Iridoids are known to deter feeding or decrease the growth rate of many generalist insect herbivores, but they often act as oviposition cues to specialist butterflies and are feeding stimulants to their larvae. In this study, two iridoid glycosides (aucubin and catalpol) were analyzed by micellar electrokinetic capillary chromatography. We measured the spatial and temporal variation of iridoid glycosides in natural populations of the host plants of M. cinxia. We also analyzed the aucubin and catalpol content in plants in relation to their use by ovipositing females, and in relation to the incidence of parasitism of M. cinxia larvae in natural populations. The mean concentrations of aucubin and catalpol were higher in P. lanceolata than in V. spicata, and catalpol concentrations were higher than aucubin concentrations in both host species. Plantago lanceolata individuals that were used for oviposition by M. cinxia had higher aucubin concentrations than random plants and neighboring plants. Additionally, oviposition and random plants had higher catalpol concentrations than neighboring plants, indicating that ovipositing females select for high iridoid glycoside plants or that oviposition induces iridoid glycoside production in P. lanceolata. Parasitism by the specialist parasitoid wasp Cotesia melitaearum occurred most frequently in larval groups that were feeding on plants with low concentrations of catalpol, irrespective of year, population, and host plant species. Therefore, parasitoids appear to avoid or perform poorly in host larvae with high catalpol content.