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从地面地震数据确定各向异性:一项实例研究

从地面地震数据确定各向异性:一项实例研究

美国勘探地球物理学家学会第66届年会

作者： p．Berthet p．williamson C．Lafond 黄子齐 Elf Aquitaine production Elf Geoscience Research Center Elf Aquitaine production

利用地面地震数据标准分析求出的速度确定地震反射层的深度,并与相应的井内的标志层进行对比观察其误差,常常能够确定有效各向异性（参见Banik,1984）。在这种情况下,我们一般面临有关获得深度图象（这种图象对于两种数据集都一致）的...

利用地面地震数据标准分析求出的速度确定地震反射层的深度,并与相应的井内的标志层进行对比观察其误差,常常能够确定有效各向异性（参见Banik,1984）。在这种情况下,我们一般面临有关获得深度图象（这种图象对于两种数据集都一致）的两个问题。首先我们必须确定一种各向异性模型（例如,具有一个垂直轴的椭圆横向各向同性）,以及估计模型参数值（Vp0,δ和ε）。第二, 我们需要采用一种处理技术,它能够考虑推导的各向异性的参数数值。本文利用来自北海中央地堑的一项实例研究,表明相对于标准处理后的结果,采用这种方法已经在井的对比和图象方面取得了进步。本文假定存在椭圆各向异性,并利用井标志层作为约束条件（williamson等,1996）通过叠加速度反演（SVI）来估计参数。我们利用TIV介质的CSM软件包进行处理,并将结果与用Ver- west（1989）的分裂各向异性深度偏移（SADM）算法的结果进行了比较。

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自清洁型喷嘴——印制电路板工业的革新

印制电路信息 1995年第12期3卷 31-33页

作者： D.p.williamson 李海 Dynamic Engineering Ltd

1.索引在印制板湿处理过程中遇到的最大问题是喷嘴常常堵塞,有时是部分堵塞,有时是全部堵塞。这样,生产受到损失,产品也常常报废。还要浪费大量的生产时间取下不能使用的喷管,或疏通堵塞的喷嘴。英国最近开发了一种新产品,经过几年的... 详细信息

1.索引在印制板湿处理过程中遇到的最大问题是喷嘴常常堵塞,有时是部分堵塞,有时是全部堵塞。这样,生产受到损失,产品也常常报废。还要浪费大量的生产时间取下不能使用的喷管,或疏通堵塞的喷嘴。英国最近开发了一种新产品,经过几年的完善,已能非常经济有效地解决堵塞问题。

关键词：自清洁喷嘴印制电路板印制板制造洗模标准喷嘴退铅水清洗活塞湿处理

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男性包皮环切术预防男性的HIV异性感染

生殖与避孕 2007年第8期27卷 553-556页

作者： Charles Morrison Robert Salata Siegfried N Muller M Volmink J Deeks J Egger M Low N Weiss H Walker S williamson p 单位不详

现有观察性研究表明,男性包皮环切术与HIV预防有高度相关性,高危人群尤为如此。然而,由于观察性研究的固有局限性,仅凭这些发现尚不能下结论。极有必要开展评估男子包皮环切术对HIV-1传播干预效果的随机对照试验。

关键词： HIV-1传播包皮环切术男性预防感染异性随机对照试验高危人群

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带电镀层接触表面之间收缩电阻的计算

机电元件 1990年第1期10卷 7-13页

作者： J.B.p.williamson J.A.Greenwood 丁方正

当电流通过两个匀质导体之间的一个很小的、圆形的接触点时,所产生的收缩电阻,其数学分析计算方法已是大家熟知的了。而且,对于在接触面之间由于众多接触点的复杂分布形态而出现的收缩电阻,也已经有了简单的数学计算公式,能对其作出很... 详细信息

当电流通过两个匀质导体之间的一个很小的、圆形的接触点时,所产生的收缩电阻,其数学分析计算方法已是大家熟知的了。而且,对于在接触面之间由于众多接触点的复杂分布形态而出现的收缩电阻,也已经有了简单的数学计算公式,能对其作出很好的近似计算。但是,具有电镀层的导体却使接解界面的电导情况发生变化,在此条件下,分析收缩电阻这个问题,用传统的椭圆座标方法;便不再是切合实际的了。对此,本文提出了一个基于最小能量原理的新的研讨,同时,展示了求出具有电镀层的导体之间的收缩电阻的方法。

关键词：电镀层导体接触表面计算电阻

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透视:德克萨斯州的当代艺术思维之路

雕塑 2006年第5期 70-71页

作者：马克.p.威廉森国际雕塑家领域

作为一名目前就职于“国际雕塑家领域”这一美国组织的执行编辑，我也曾经是生产欧洲细瓷的奢侈品生产厂商——Herend瓷器公司（匈牙利）的合伙人，师从于国际闻名的大师级石雕艺术家Jesus Moroles和Xavier Corbero，在中国深圳、曼哈... 详细信息

作为一名目前就职于“国际雕塑家领域”这一美国组织的执行编辑，我也曾经是生产欧洲细瓷的奢侈品生产厂商——Herend瓷器公司（匈牙利）的合伙人，师从于国际闻名的大师级石雕艺术家Jesus Moroles和Xavier Corbero，在中国深圳、曼哈顿、桑塔非和新墨西哥等地居住过。2001年我成了一名职业雕塑家。

关键词：当代艺术艺术品经销商艺术产品贸易商雕塑家美术家当代雕塑德克萨斯州艺术画廊

英国炎症性肠病费用调查:一项单中心回顾性研究

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世界核心医学期刊文摘（胃肠病学分册） 2005年第3期1卷 40-41页

作者： Bassi A. Dodd S. williamson p. Bodger K. 杨瑗 University Department of Medicine Clinical Sciences Centre University Hospital Aintree Liverpool L9 7AL United Kingdom Dr.

Background and aims: The potentially high costs of care associated with inflammatory bowel disease (IBD) are recognised but we have little knowledge of the scale, profile, or determinants of these costs in the UK. This study aimed to describe costs of illness for a group of IBD patients and determine factors associated with increased healthcare costs. Setting: A university hospital serving a target population of approximately 330 000. patients and methods: A six month cohort of IBD patients receiving any form of secondary care was identified, comprising 307 cases of ulcerative (or indeterminate) colitis and 172 cases of Crohns disease. Demographic and clinical data were abstracted from clinical records and individual resource use was itemised for all attributable costs (including extraintestinal manifestations). Item costs were derived from national and local sources. Cost data were expressed as mean six month costs per patient (with 95%confidence interval (CI)) obtained using non parametric bootstrapping. Determinants of cost were analysed using generalised linear regression modelling. A postal survey of patients was undertaken to examine indirect costs, out of pocket expenses, and primary care visits. Results: Inpatient services (medical and/or surgical) were required by 67 patients (14%) but accounted for 49%of total secondary care costs. Drug costs accounted for less than a quarter of total costs. Individual patient costs ranged from ￡73 to ￡33 254 per six months. Mean (95%CI) six month costs per patient were ￡1256 (￡988, ￡1721) for colitis and ￡1652 (￡1221, ￡2239) for Crohns disease. Hospitalisation, disease severity grade, and disease extent correlated positively with cost of illness but costs were independent of age or sex. Comparedwith quiescent cases of IBD, disease relapse was associated with a 2-3-fold increase in costs for non hospitalised cases and a 20-fold increase in costs for hospitalised cases. Survey data suggested average six month costs were<

关键词：炎症性肠病单中心克罗恩病二级护理大学医院费用增加费用问题临床数据患者群临床记录

High rate production of concentrated sulfides from metal bearing wastewater in an expanded bed hydrogenotrophic sulfate reducing bioreactor

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Environmental Science and Ecotechnology 2022年第3期11卷 49-56页

作者： pieter Ostermeyer Josefien Van Landuyt Luiza Bonin Karel Folens Adam williamson Tom Hennebel Korneel Rabaey Center of Microbial Ecology and Technology(CMET) Faculty of Bioscience EngineeringGhent UniversityCoupure Links 653B-9000GentBelgium CApTURE Frieda Saeysstraat 19000GentBelgium CENBG Universite de BordeauxCNRS-IN2P3/19 chemin du SolariumCS1012033175GradignanFrance Umicore Group Research&DevelopmentCompetence Area Recycling and Extraction TechnologiesWatertorenstraat 33B-2250OlenBelgium

Metallurgical wastewaters contain high concentrations of sulfate,up to 15 g L^(-1).Sulfate-reducing bioreactors are employed to treat these wastewaters,reducing sulfates to sulfides which subsequently coprecipitate *** loading and reduction rates are typically restricted by the total H2S *** stripping,sulfide precipitation and dilution are the main strategies employed to minimize inhibition by H2S,but can be adversely compromised by suboptimal sulfate reduction,clogging and additional energy ***,metallurgical wastewater was treated for over 250 days using two hydrogenotrophic granular activated carbon expanded bed bioreactors without additional removal of sulfides.H2S toxicity was minimized by operating at pH 8±0.15,resulting in an average sulfate removal of 7.08±0.08 g L^(-1),sulfide concentrations of 2.1±0.2 g L^(-1) and peaks up to 2.3±0.2 g L^(-1).A sulfate reduction rate of 20.6±0.9 g L^(-1)d^(-1) was achieved,with maxima up to 27.2 g L^(-1)d^(-1),which is among the highest reported considering a literature review of 39 *** rates reported here are 6e8 times higher than those reported for other reactors without active sulfide removal and the only reported for expanded bed sulfate-reducing bioreactors using *** increasing the influent sulfate concentration and maintaining high sulfide concentrations,sulfate reducers were promoted while fermenters and methanogens were *** wastewater containing 4.4 g L^(-1) sulfate,0.036 g L^(-1) nitrate and various metals(As,Fe,Tl,Zn,Ni,Sb,Co and Cd)was successfully treated with all metal(loid)s,nitrates and sulfates removed below discharge limits.

关键词： Sulfate reduction Sulfides High rate Metallurgical wastewater Hydrogenotrophic expanded bed Microbial community analysis

On the character of certain tilting modules

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Science China Mathematics 2018年第2期61卷 295-298页

作者： George Lusztig Geordie williamson Department of Mathematics Massachusetts Institute of Technology Cambridge MA 02139-4307 USA Max planck Institut fur Mathematik Bonn 53111 Germany

Let G be a semisimple group over an algebraically closed field of characteristic p > 0. We give a(partly conjectural) closed formula for the character of many indecomposable tilting rational G-modules assuming that p ... 详细信息

关键词：特性模块代数学

Forage and breed effects on behavior and temperament of pregnant beef heifers

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Journal of Animal Science and Biotechnology 2013年第3期4卷 165-169页

作者： Angela R Mays Michael L Looper Benjamin C williamson Kenneth p Coffey Wayne K Coblentz Glen E Aiken Charles F Rosenkrans Jr Department of Animal Science University of ArkansasFayetteville AR 72701 USA Department of Agricultural Sciences Morehead StateUniversity327 Reed Hall Morehead KY 40351 USA USDA-ARS US Dairy Forage Research CenterMarshfield WI 54449 USA USDA-ARS Forage Animal Production Research UnitLexingtonKY 40546 USA

Background： Integration of behavioral observations with traditional selection schemes may lead to enhanced animal well-being and more profitable forage-based cattle production ***-influenced（BR;n = 64） and Gelbvieh × Angus（GA;n = 64） heifers consumed either toxic endophyte-infected tall fescue（E＋） or one of two nontoxic endophyte-infected tall fescue（NT） cultivars during two *** were weighed at midpoint and termination of *** behavior（grazing,resting in the shade,lying,or standing without grazing） was recorded（n = 13 visual observations per yr in June and July） for each *** yr 2,exit velocity（EV） and serum prolactin（pRL） were ***： Grazing behavior was influenced（p 0.05） by an interaction between fescue cultivar and breed *** × Angus heifers assigned to E＋ pastures had the lowest percentage of animals grazing and the largest percentage of animals resting in the ***-influenced heifers had faster EV（p 0.001） than GA heifers（0.52 vs.0.74 ± 0.04 s/m,respectively）.Body weight（BW） was affected（p 0.01） by an interaction of tall fescue cultivar and d,and an interaction of tall fescue cultivar and breed *** grazing NT pastures were heavier（p 0.01） than heifers grazing E＋ pastures at midpoint and *** × Angus heifers grazing NT pastures were heavier（p 0.01） than GA and BR heifers grazing E＋ and BR heifers grazing NT *** interaction of forage cultivar and breed type occurred on serum pRL（p 0.01）.Conclusion： Collectively fescue cultivar,EV,and concentrations of serum pRL were associated with grazing *** grazing NT pastures were observed to be grazing more than heifers assigned to E＋ pastures,regardless of breed type,which may have contributed to changes in BW and average daily gain（ADG） in *** of behavioral observations along with traditional selection schemes may lead to enhanced animal well-being and more profitable forage-based cattle prod

关键词： Cattle Endophyte-infected tall fescue Grazing behavior prolactin Temperament