水基钻井液高温高压密度预测新模型

高温深井中,钻井液密度是温度和压力的函数,高温会使井眼中的钻井液发生膨胀,密度降低,而在深井中的高压则会压缩钻井液,使密度增加。随着井深的增加,钻井液密度不再是一个常数。用地面恒定的测试结果计算井下当量循环密度,使计算结果和井下压力测试结果存在差异,对于窄安全密度窗口的高温深井,对井控存在一定的安全隐患。因此,建立准确的钻井液高温高压密度预测模型,确保钻井液静压和动压计算准确,能够为钻井工程技术人员合理调配钻井液性能参数和控制钻井参数提供准确的参考数据和依据,从而减少复杂事故的发生。这对井下压力的精确计算具有重要意义。首先对影响钻井液密度的敏感因素:温度、压力、岩屑溶度和井口回压进行了理论分析;然后通过水的高温高压密度数据,利用多元非线性回归分析,建立了水基钻井液高温高压密度预测模型。现场实测数据验证,吻合较好,相比经验模型,使用方便、实用。     

小麦新品种“白粒2号”的选育及栽培措施研究

“白粒二号”是凉山州西昌农科所和四川农业大学采用弄地联合育种的形式培育的小麦新品种。经1994～1999年试验示范及较大面积生产应用结果表明:该产品丰产性好,一般可比西辐5号增产10%以上,抗条锈病的能力明显优于绵阳20、26等系列品种.分蘖成穗率高,适应性强,籽粒品质好,是一个具有良好推广应用价值的新品种。在适宜地区肥水条件稍好的田块种植,因地制宜地适期播种,合理密植,优化施肥并加强田间管理,一般亩产可达400kg 以上。     

苦荞麦新品种“西荞一号”的选育及利用

采用地方苦荞品种“额洛乌且”作原始材料,用γ射线500Gy 0.1%秋水仙素对其处理后,从其变异后代中按单株选择法选出“西荞一号”新品种,该新品种具有高产、优质、高抗落粒的特性。     

论美国单极战略及其与中俄多极战略的矛盾

冷战后,由于时代特点、各国实力对比、美国国内政治思潮,以及国际政治自身的特点,美国积极谋划单极战略,并逐渐付诸实施。中俄提出多极战略以反对美国单极战略并形成相持局面。     

广义向量相补问题的解的存在性定理

本文在Hausdorff线性拓扑空间的框架下 ,得到广义向量相补问题的解的存在性定理 ,其中利用了escaping序列的概念     

The transcendental method from Newton to Kant

Kant’s transcendental method, as applied to natural philosophy, considers the laws of physics as conditions of the possibility of experience. A more modest transcendental project is to show how the laws of motion explicate the concepts of motion, force, and causal interaction, as conditions of the possibility of an objective account of nature. This paper argues that such a project is central to the natural philosophy of Newton, and explains some central aspects of the development of his thinking as he wrote the Principia. One guiding scientific aim was the dynamical analysis of any system of interacting bodies, and in particular our solar system; the transcendental question was, what are the conceptual prerequisites for such an analysis? More specifically, what are the conditions for determining “true motions” within such a system—for posing the question of “the frame of the system of the world” as an empirical question? A study of the development of Newton’s approach to these questions reveals surprising connections with his developing conceptions of force, causality, and the relativity of motion. It also illuminates the comparison between his use of the transcendental method and that of Euler and Kant.     

Two new species of the genus Chilibathynella Noodt, 1963 and Onychobathynella bifurcata gen. et sp. nov (Crustacea: Syncarida: Parabathynellidae) from New South Wales,Australia

Two new species of the parabathynellid genus Chilibathynella Noodt, 1963 Noodt, W. 1963. Estudios sobre Crustaceos de aguas subterraneas, III. Crustacea Syncarida de Chile Central. Investig Zool Chilenas, 10: 151–167.  [Google Scholar] are described from Australia. Chilibathynella joshuai sp. nov. has a unique combination of morphological characters, which includes five-segmented antenna, no epipodite on thoracopod I, two setae on the endopod of the male thoracopod VIII, homonomous row of 17 spines on uropodal sympod, uropodal exopod with four distal spines and a flat anal operculum. Chilibathynella digitus sp. nov. has two exclusive characters: six teeth on the pars incisiva of the mandible and a large, elongated digitiform protuberance (resembling a finger) on the basipod of male thoracopod VIII. The species also displays a unique combination of morphological characters, which includes five-segmented antenna, no epipodite on thoracopod I, no outer marginal seta on the first and second segments of the endopod of thoracopod I to VII, two setae on the endopod of the male thoracopod VIII, homonomous row of 12 spines on uropodal sympod, uropodal exopod with three distal spines and an unprotruded anal operculum. The two new species extend the distribution of the Chilibathynella genus in Australia from Victoria to New South Wales. A new genus and species of the family Parabathynellidae, Onychobathynella bifurcata gen. nov. sp. nov., is described from New South Wales, Australia. The new genus displays an evolutionary novelty, for Parabathynellidae and the entire group of Bathynellacea: the antennule, antenna, thoracopods, pleopod I and uropod have setae that are strong, thick, short, barbed and claw-like. This new genus is the first in the family without smooth setae on the antennule and antenna. The new genus also has a combination of characters that makes it unique in Parabathynellidae: the antennule is eight-segmented like Octobathynella Camacho and Hancock, 2010 Camacho, AI and Hancock, P. 2010. A new record of Parabathynellidae (Crustacea, Bathynellacea) in Australia: a new genus and species from New South Wales. J Nat Hist, 44(17–18): 1081–1094. [Taylor & Francis Online], [Web of Science ®] , [Google Scholar]; the antenna is five-segmented; the labrum has 20 teeth; the exopod of thoracopod I to VII has only one segment; the endopod lacks dorsal setae on the first segment and the epipod is absent from thoracopod I; first pleopods are present and resemble two barbed curved claws; there are 18 bifid spines on the sympod, two spines and four setae resembling strong barbed claws on the endopod and six robust setae on the exopod of the uropod.     

Five new Uropodina species from New Caledonia (Acari: Mesostigmata)

Five new species – Deraiophorus pinesensis sp. nov., Oplitis hallidayi sp. nov., Castriidinychus neocaledonicus sp. nov., Trigonuropoda neocaledonica sp. nov. and Trigonuropoda fendai sp. nov. – are described and illustrated on the basis of specimens collected in New Caledonia. http://www.zoobank.org/urn:lsid:zoobank.org:pub:2F6876E3-948B-4EDC-93EF-4623033BD71E     

惯性购买市场中的品牌竞争扩散模型

通过引入反映惯性购买市场对新产品(新品牌)扩散阻滞作用的一组系数,对Bass模型进行差异性柔化,并运用马尔柯夫链的方法对顾客期望状态转移概率进行估计,建立了惯性购买市场中更新换代产品的品牌竞争扩散模型.