检索结果-南通市图书馆

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

电磁兼容原理与应用

电磁兼容原理与应用

提高多模式MIMO接收器性能,同时减小占板面积

作者： (加)大卫·A. 韦斯顿(David A. weston)

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

电子产品世界 2012年第5期19卷 42-43,48页

作者： Vlad Dvorkin Tom Schiltz weston Sapia James Wong 凌力尔特公司高频产品部凌力尔特公司高频产品部RFIC部

为方便4G网络的部署,无线基站正面临着许多严苛的性能挑战,提高基站的MIMO(多输入、多输出)性能成为当前亟需解决的问题之一。本文重点论述了目前在改善无线基站方面的几个热点问题。

关键词： 4G 无线基站 MIMO 带宽占板面积

Biosystems Design to Accelerate C3-to-CAM Progression

在线全文

学校读者我要写书评

暂无评论

BioDesign Research 2020年第1期2020卷 18-33页

作者： Guoliang Yuan MdMahmudul hassan Degao Liu Sung Don Lim Won Cheol Yim John C.Cushman Kasey Markel Patrick M.Shih haiwei Lu David J.weston Jin-Gui Chen Timothy J.Tschaplinski Gerald A.Tuskan Xiaohan Yang Biosciences Division Oak Ridge National LaboratoryOak RidgeTN 37831USA The Center for Bioenergy Innovation Oak Ridge National LaboratoryOak RidgeTN 37831USA Department of Genetics and Plant Breeding Patuakhali Science and Technology UniversityDumkiPatuakhali 8602Bangladesh Department of Genetics Cell Biology and DevelopmentCenter for Precision Plant Genomicsand Center for Genome EngineeringUniversity of MinnesotaSaint PaulMN 55108USA Department of Applied Plant Sciences Kangwon National UniversityChuncheon 24341Republic of Korea Department of Biochemistry and Molecular Biology University of NevadaRenoNVUSA Department of Plant Biology University of CaliforniaDavisDavisCAUSA Feedstocks Division Joint BioEnergy InstituteEmeryvilleCAUSA

Global demand for food and bioenergy production has increased rapidly,while the area of arable land has been declining for decades due to damage caused by erosion,pollution,sea level rise,urban development,soil salinization,and water scarcity driven by global climate *** order to overcome this conflict,there is an urgent need to adapt conventional agriculture to water-limited and hotter conditions with plant crop systems that display higher water-use efficiency(WUE).Crassulacean acid metabolism(CAM)species have substantially higher WUE than species performing C3 or C4 *** plants are derived from C3 photosynthesis ***,it is extremely unlikely that the C3 or C4 crop plants would evolve rapidly into CAM photosynthesis without human ***,there is growing interest in improving WUE through transferring CAM into C3 ***,engineering a major metabolic plant pathway,like CAM,is challenging and requires a comprehensive deep understanding of the enzymatic reactions and regulatory networks in both C3 and CAM photosynthesis,as well as overcoming physiometabolic limitations such as diurnal stomatal *** advances in CAM evolutionary genomics research,genome editing,and synthetic biology have increased the likelihood of successful acceleration of C3-to-CAM ***,we first summarize the systems biology-level understanding of the molecular processes in the CAM ***,we review the principles of CAM engineering in an evolutionary ***,we discuss the technical approaches to accelerate the C3-to-CAM transition in plants using synthetic biology toolboxes.

关键词： overcome acceleration evolve

Biological Parts for Plant Biodesign to Enhance Land-Based Carbon Dioxide Removal

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

BioDesign Research 2021年第1期2021卷 17-38页

作者： Xiaohan Yang Degao Liu haiwei Lu David J.weston Jin-Gui Chen Wellington Muchero Stanton Martin Yang Liu Md Mahmudul hassan Guoliang Yuan Udaya C.Kalluri Timothy J.Tschaplinski Julie C.Mitchell Stan D.Wullschleger Gerald A.Tuskan Biosciences Division Oak Ridge National LaboratoryOak RidgeTN 37831USA The Center for Bioenergy Innovation Oak Ridge National LaboratoryOak RidgeTN 37831USA Department of Genetics Cell Biology and DevelopmentCenter for Precision Plant Genomicsand Center for Genome EngineeringUniversity of MinnesotaSaint PaulMN 55108USA Department of Academic Education Central Community College-HastingsHastingsNE 68902USA Environmental Sciences Division and Climate Change Science Institute Oak Ridge National LaboratoryOak RidgeTN 37831USA

A grand challenge facing society is climate change caused mainly by rising CO_(2) concentration in Earth’s *** plants are linchpins in global carbon cycling,with a unique capability of capturing CO_(2) via photosynthesis and translocating captured carbon to stems,roots,and soils for long-term ***,many researchers postulate that existing land plants cannot meet the ambitious requirement for CO_(2) removal to mitigate climate change in the future due to low photosynthetic efficiency,limited carbon allocation for long-term storage,and low suitability for the *** address these limitations,there is an urgent need for genetic improvement of existing plants or construction of novel plant systems through biosystems design(or biodesign).here,we summarize validated biological parts(e.g.,protein-encoding genes and noncoding RNAs)for biological engineering of carbon dioxide removal(CDR)traits in terrestrial plants to accelerate land-based decarbonization in bioenergy plantations and agricultural settings and promote a vibrant ***,we first summarize the framework of plant-based CDR(e.g.,CO_(2) capture,translocation,storage,and conversion to value-added products).Then,we highlight some representative biological parts,with experimental evidence,in this ***,we discuss challenges and strategies for the identification and curation of biological parts for CDR engineering in plants.

关键词： dioxide roots locating

收治医师专业和医院类型对2004—2005年间英格兰和威尔士心肌梗死患者医疗和转归的影响:观察性研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

世界核心医学期刊文摘（心脏病学分册） 2007年第2期3卷 1-2页

作者： Birkhead J. weston C. Lowe D. 郭俊 Clinical Effectiveness and Evaluation Unit Royal College of Physicians of London London NW1 4LE United Kingdom

目的:确定英格兰和威尔士因急性心肌梗死住院患者的医疗过程及转归与顾问医疗类型和医院类型的关系。设计:利用心肌梗死国家审核项目(MINAP)数据库,对在2004—2005年间因心肌梗死住院的88782例患者进行观察性研究。

关键词：观察性研究威尔再灌注治疗并存病介入性心脏病学血管造影二级预防校正死亡率死亡风险

InSAR地震源模型与地震学方法地震源模型的系统比较

在线全文

学校读者我要写书评

暂无评论

地壳构造与地壳应力 2013年第1期 12-38页

作者： Jennifer weston Ana M.G.Ferreira Gareth J.Funning 高敏英国诺维奇东英吉利大学环境科学学院葡萄牙里斯本理工大学美国加利福尼亚大学地球科学院

鲁棒震源参数(如位置、震矩、断层几何要素)对于鲁棒地震灾害风险评估和大规模的构造调查而言是至关重要的。通常应用近期的地震学方法和合成孔径雷达干涉测量技术(InSAR)来估计这些参数,但仅通过这两个数据并不能很全面地进行估计。本... 详细信息

鲁棒震源参数(如位置、震矩、断层几何要素)对于鲁棒地震灾害风险评估和大规模的构造调查而言是至关重要的。通常应用近期的地震学方法和合成孔径雷达干涉测量技术(InSAR)来估计这些参数,但仅通过这两个数据并不能很全面地进行估计。本综述把来自全球地震目录和区域地震目录的震源参数与来自一个近期数据集的InSAR震源参数进行比较,其中这个数据集随着这项研究的18个附加震源模型的加入而有所扩大。研究表明这两个数据集的矩震级(Mw)估计值比较一致,在InSAR模拟的逆冲断层中矩震级(Mw)的估计值有稍微增大的趋势。用InSAR确定的地震地点与区域目录中公布的地震地点相一致,两者的中值差为6.3km,小于其与全球地震目录中公布的地震地点的中值差。对于矩震级Mw≥6.5的地震,通过比较ISC震源与全球质心矩张量目录(GCMT)和国际质心矩张量目录(ICMT)的质心位置来研究震源参数和震源方向性的一致性。在某些情况下震源的方向性与先前的研究可定性地比较,尤其是在比较ISC和ICMT的震源位置时。如果在InSAR数据反演中使用一个层状半空间,那么InSAR所确定的深度与EhB目录中的深度之间的平均差值会减小。总体而言,断层几何要素(走向、倾向和倾角)与GCMT目录中公布的值保持一致,并且任何大的差值都可以归因于参数之间的权衡。随着雷达干涉测量卫星的不断发展,InSAR逐渐成为估计震源参数的一项重要技术。InSAR确定的震源参数与用地震学方法确定的震源参数之间所观察到的趋势和差异是由数据、不同反演技术以及假定的地球结构模型而导致的。

关键词： InSAR 震源参数联合反演空间测量

基于深度学习法的CT扫描自动腹部分割对人体组成的分析

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2019年第3期 354-355页

作者：庞国栋 A.D.weston P.Korfiatis T.L.Kline K.A.Philbrick P.Kostandy T.Sakinis Department of Radiology Mayo Clinic

摘要目的开发和评估一种从CT影像中分割腹部来量化身体组成成分的全自动算法。材料与方法这项回顾性研究通过训练应用基于U-Net体系结构的卷积神经网络对

关键词： CT hCC

慢性胃食管反流病(GERD)高危患者Barrett食管的发病率

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

世界核心医学期刊文摘（胃肠病学分册） 2005年第8期1卷 27-28页

作者： Westhoff B Brotze S weston A P. Sharma 郝筱倩 Div.of Gastroenterol. and hepatol. Univ. of Kansas School of Medicine VA Medical Center 4801 E. Linw ood Blvd.KansasCityMO64128United States.Dr

Background: The reported frequency of Barrett’s esophagus(BE) in patients wit h reflux symptoms varies from 5%to 15%.The exact frequency of long-segment BE (LSBE) (>3 cm) and short-segment BE (SSBE) (h chronic s ymptoms of GERD is uncertain. The aim of this study was to determine the frequen cy of LSBE and SSBE in consecutive patients presenting for a first endoscopic ev aluationwith GERD as the indication. Methods: Consecutive patients presenting to the endoscopy unit of a Veterans Affairs Medical Center for a first upper endos copy with the indication of GERD were prospectively evaluated. Demographic infor mation (gender,race, age), data on tobacco use and family history of esophageal disease, and body mass index (BMI) were recorded for all patients. Before endosc opy, all patients completed a validated GERD questionnaire. The diagnosis of BE was based on the presence of columnar-appearing mucosa in the distal esophagus, with confirmation by demonstration of intestinal metaplasia in biopsy specimens . All patients with erosive esophagitis on the initial endoscopy underwent a sec ond endoscopy to document healing and to rule-out underlying *** with a history of BE, alarm symptoms (dysphagia,weight loss, anemia, evidence of GI bl eeding), or prior endoscopy were excluded. Results: A total of 378 consecutive p atients with GERD (94%men, 86%white; median age 56 years, range 27-93 years) were evaluated. A diagnosis of BE was made in 50 patients (13.2%). The median l ength of Barrett’s esophagus (BE) was 1.0 cm (range 0.5-15.0 cm). Of the patie nts with BE, 64%had short-segment BE (SSBE) (overall SSBE frequency 8.5%). Th e overall frequency of long-segment BE (LSBE) was 4.8%. A hiatal hernia was de tected in 62%of the pati- entswith BE. Of the 50 patientswith BE (median age 62 years, range 29-81 year s), 47 (94%) were men and 98%were white. Eighteen patients (36%) were using t obacco at the time of endoscopy; 23 (46%) were former users. Th

关键词： Barrett食管胃食管反流食管疾病反流症状消化道内镜检查食管裂孔疝统计学资料短节段症状持续时间内镜组

在线全文

学校读者我要写书评

暂无评论

美国低碳电力行业监管的国际经验

电力需求侧管理 2015年第4期17卷 61-64页

作者： Max Dupuy Riley Allen David Crossley Rick weston Fritz Kahrl Kevin Porter 睿博能源智库北京100004

从全球来看，电力行业的排放占能源相关排放的比例高于1／3，占煤炭消费的比例高于2／3。无论是监管程序、决策还是机制，均会对电力行业的投资、运作和排放量产生复杂而微妙的深远影响。尽管监管的许多方面并未明确旨在解决气候或环境... 详细信息

从全球来看，电力行业的排放占能源相关排放的比例高于1／3，占煤炭消费的比例高于2／3。无论是监管程序、决策还是机制，均会对电力行业的投资、运作和排放量产生复杂而微妙的深远影响。尽管监管的许多方面并未明确旨在解决气候或环境问题，但其仍能对排放产生巨大影响。因此，有关电力行业的减排主题，需要对监管问题进行深入了解。本文将对美国的电力行业监管的发展和趋势，及其与行业排放量之间的关系进行介绍。

关键词：行业监管电力行业国际经验美国低碳排放量煤炭消费环境问题