检索结果-南通市图书馆

Surface integral analogy approaches for predicting noise from 3d high-lift low-noise wings

Acta Mechanica Sinica 2014年第3期30卷 326-338页

作者： Hua-dong Yao Lars davidson Lars-Erik Eriksson Shia-Hui Peng Olof Grundestam Peter E.Eliasson department of Applied Mechanics Chalmers University of Technology department of Aeronautics and Systems Technology Swedish Defence Research Agency (FOI)

Three surface integral approaches of the acoustic analogies are studied to predict the noise from three concep- tual configurations of three-dimensional high-lift low-noise wings. The approaches refer to the Kirchhoff method, the Ffowcs Williams and Hawkings （FW-H） method of the permeable integral surface and the Curle method that is known as a special case of the FW-H method. The first two approaches are used to compute the noise generated by the core flow region where the energetic structures exist. The last approach is adopted to predict the noise specially from the pressure perturbation on the wall. A new way to con- struct the integral surface that encloses the core region is proposed for the first two methods. Considering the local properties of the flow around the complex object-the actual wing with high-lift devices-the integral surface based on the vorticity is constructed to follow the flow structures. The surface location is discussed for the Kirchhoff method and the FW-H method because a common surface is used for them. The noise from the core flow region is studied on the basis of the dependent integral quantities, which are indicated by the Kirchhoff formulation and by the FW-H formulation. The role of each wall component on noise contribution is analyzed using the Curle formulation. Effects of the volume integral terms of Lighthill＇s stress tensors on the noise pre-diction are then evaluated by comparing the results of the Curle method with the other two methods.

关键词： Aero-acoustics High-lift facilities Surface integral approaches of acoustic analogy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

100-Gb/s undersea transmission with high spectral efficiency using pre-filtered QPSK modulation format

引用

Chinese Optics Letters 2010年第9期8卷 831-836页

作者： J.-X. Cai Y. Cai C. R. davidson d. G. Foursa A. Lucero O. Sinkin W. Patterson A. Pilipetskii G. Mohs Neal S. Bergano Tyco Electronics Subsea Communications LLC ("TE SubCom" formerly known as ~co Telecommunications (US) Inc.) 250 Industrial Way West Eatontown NJ 07724 USA

We provide a review of our recent 100-Gb/s, high spectral efficiency （SE） experiment targeting transoceanic and regional undersea transmission distances. We demonstrated that simple pre-filtering at the transmitter together with a maximum a posteriori probability （MAP） detection algorithm can significantly improve SE. We transmitted 96×100-Gb/s pre-filtered polarization division multiplexed return-to-zero quadrature phase shift keyed （PdM-RZ-QPSK） channels with 300% SE over 10608 km using 52-km spans of 150-μm 2 fiber and simple single-stage erbium-doped fiber amplifiers （EdFAs）. We also achieved 400% SE over 4368 km using similar techniques.

关键词： Bit error rate Erbium doped fiber amplifiers Modulation Optical signals Quadrature phase shift keying Signal processing

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Iris manipulation during phacoemulsification:intraoperative and postoperative complications

引用

International Journal of Ophthalmology(English edition) 2021年第5期14卷 676-683页

作者： Eric R.Williams Jennifer L.Patnaik d.Claire Miller Anne M.Lynch Richard S.davidson Malik Y.Kahook Leonard K.Seibold department of Ophthalmology Sue Anschutz-Rodgers Eye CenterUniversity of Colorado School of MedicineAuroraCO 80045USA

AIM:To quantify intraoperative and postoperative complications in complex phacoemulsification cataract extraction(phacoemulsification)with iris manipulation compared to non-complex and complex phacoemulsification without iris ***:All phacoemulsification cases at the University of Colorado between January 1,2014,and June 30,2017 were *** criteria for the primary outcome of intraoperative complications were planned combination surgery and eyes with less than 28 d *** criteria for the secondary outcomes of postoperative complications were unplanned additional surgery,and chronic steroid eye drop use prior to *** including sex,race/ethnicity,surgery length,visual acuity,intraoperative and postoperative complications,and intraocular pressures(IOP)were collected and analyzed utilizing general linear and Logistic regression ***:The medical records of 5772 eyes were reviewed(500 complex without iris manipulation,367 with iris manipulation).The number of any intraoperative complication in the complex with iris manipulation and complex without iris manipulation groups was 15(4.1%)and 26(5.2%),respectively,compared to 41(0.8%)in the non-complex *** inflammation was found in 135(2.8%)non-complex cases,20(4.1%)complex cases without iris manipulation,and 20(5.6%)complex cases with iris *** adjusted odds ratio of postoperative inflammation in phacoemulsification with iris manipulation compared to non-complex was 2.3(95%CI:1.3-4.0,P=0.005).The rate of IOP spikes>10 mm Hg was significantly greater in cases with iris manipulation(P=0.001).CONCLUSION:Complex cases have more intraoperative ***,only complex cases with iris manipulation led to increase rates of postoperative inflammation and IOP spikes>10 mm Hg.

关键词： phacoemulsification iris manipulation inflammation

来源：

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

High‐throughput formation of miniaturized cocultures of 2d cell monolayers and 3d cell spheroids using droplet microarray

引用

droplet 2023年第1期2卷 36-46页

作者： Haijun Cui Tina Tronser Xianxian Wang Janine Wesslowski Gary davidson Anna A.Popova Pavel A.Levkin Institute of Biological and Chemical Systems‐Functional Molecular Systems(IBCS‐FMS) Karlsruhe Institute of Technology(KIT)Eggenstein‐LeopoldshafenGermany Key Laboratory of Biorheological Science and Technology Ministry of EducationCollege of BioengineeringChongqing UniversityChongqingChina Institute of Organic Chemistry Karlsruhe Institute of Technology(KIT)KarlsruheGermany

Most of the biological processes,including cell signaling,cancer invasion,embryogenesis,or neural development,are dependent on and guided by the complex architecture and composition of cellular *** such microenvironments in cell coculture models is crucial for fundamental and applied biology *** ability to combine different cell types grown as both two‐dimensional(2d)monolayers and three‐dimensional(3d)spheroids in specific defined location inside a microculture environments is a key towards in vitro tissue modeling and towards mimicking complex in vivo cellular *** this study,we introduce and investigate a method to create in vitro models of 2d cell monolayers cocultured with 3d spheroids in defined *** demonstrate the possibility of creating such complex cellular microenvironments in a high‐throughput and automated manner by creating arrays of such droplets containing prearranged 2d and 3d cellular ***,we demonstrate an application of this approach to study paracrine propagation of Wnt signaling between 2d and 3d cellular *** method provides a general approach for the miniaturized,high‐throughput,and automated formation of complex coculture cellular microarchitectures that will be useful for mimicking various in vivo complex cellular structures and for studying complex biological processes in vitro.

关键词： invasion architectures coculture

来源：

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

The regulatory genome

引用

丛书名：科爱传播.

2007年

作者： davidson Eric H.

"导读版."

ISBN: (纸本)9787900224026

"导读版."

关键词： Gene Expression Regulation.

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

Are there sex-based disparities in cataract surgery?

引用

International Journal of Ophthalmology(English edition) 2024年第1期17卷 137-143页

作者： Matthew d.Geiger Anne M.Lynch Alan G.Palestine Nathan C.Grove Karen L.Christopher Richard S.davidson Michael J.Taravella Naresh Mandava Jennifer L.Patnaik department of Ophthalmology University of Colorado School of MedicineAuroraCO 80045USA

AIM:To investigate sex-based differences in the occurrence of intra-operative and post-operative complications and associated visual outcomes following cataract ***:This was a retrospective study of patients who had phacoemulsification cataract surgery at the University of Colorado School of *** collected included the patient’s health history,ocular comorbidities,operative and post-operative complications,and the post-operative best corrected visual acuity(BCVA).The data were analyzed using univariate and multivariable logistic regression with generalized estimating equations to account for the correlation of some patients having two eyes included in the ***:A total of 11977 eyes from 7253 patients were included in the *** comorbidities differed by sex,with males having significantly higher percentages of traumatic cataracts(males 0.7%vs females 0.1%),prior ocular surgery(6.7%vs 5.5%),and mature cataracts(2.8%vs 1.9%).Conversely,females had significantly higher rates of pseudoexfoliation(2.0%vs 3.2%).In unadjusted analysis,males had higher rates of posterior capsular rupture(0.8%vs 0.4%)and vitreous loss(1.0%vs 0.6%),but this difference was not significant after adjustment for *** had a significantly increased risk of post-operative retinal detachment,but in multivariable analysis this was no longer *** were significantly less likely to undergo post-operative neodymium-doped yttrium aluminum garnet(Nd:YAG)laser capsulotomy for posterior capsule opacification(OR=0.8,95%CI=0.7-0.9,P=0.0005).The BCVA was slightly worse for males pre-operatively;but post-operatively,both sexes exhibited similar visual acuity of Snellen equivalent 20/***:The study finds that in a cohort of patients presenting for cataract surgery,sex differences exist in pre-operative comorbidities and surgical characteristics that contribute to higher rates of some complications for ***,observed surgical complicatio

关键词： cataract surgery sex-based disparity phacoemulsification outcomes

来源：

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

聚乙烯乙二醇诱导水分亏缺对春小麦分蘖的影响

引用

国外农学（麦类作物） 1989年第1期 38-40页

作者： d.J.davidson P.M.Chevalier 肖凯

小麦的分蘖受栽培措施和坏境条件的影响。许多研究表明,干旱可减少小麦的分蘖成穗数。本试验旨在确定在人工控制条件下降低根系周围渗透势对春小麦各级分蘖数的影响。在人工气候室内水培睿小麦品种"Edwall"和"Waverly"。除对照外,用聚... 详细信息

小麦的分蘖受栽培措施和坏境条件的影响。许多研究表明,干旱可减少小麦的分蘖成穗数。本试验旨在确定在人工控制条件下降低根系周围渗透势对春小麦各级分蘖数的影响。在人工气候室内水培睿小麦品种"Edwall"和"Waverly"。除对照外,用聚乙烯乙二醇把培养液的水势维持在—0.1、—0.3和—0.5兆帕三个水平上。在植株营养生长期间测定了它们的分蘖状况、叶面积、植株干物质重量和水分关系。改变根系周围营养液的渗透浓度可推迟分蘖始期,并且使叶面积、干物质、三级和四级分蘖数减少,一级和二级分蘖不受 PEG(聚乙烯乙二醇)处理影响。在播种后40天,PEG 处理植株的水势和渗透势比对照植株负值更大,但二者的压力势则相似。植株通过积累溶质降低渗透势和维持正常的膨压来适应 PEG 诱导的胁迫。适应之后重新开始分蘖,但这时产生的分蘖较小。因此,这种分蘖对渗透胁迫不太敏感,而其后来的营养生长对渗透胁迫则较敏感。

关键词：小麦聚乙烯二醇水分亏缺分蘖

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

超级计算机设计的折衷考虑与CEdAR系统

引用

计算机工程与科学 1989年第2期11卷 56-63页

作者： E.davidson d.Kuck d.Lawrie A.Sameh 常春喜

一、引言计算机设计人员常常必须在所期望获得的体系结构特点与实际用来制造一个系统的硬件之间进行折衷。在超级计算机的设计中,由于希望获得高速度,而这样又容易加大成本,因而这些折衷就更加重要了。今天,设计人员在以每秒1亿多次算... 详细信息

一、引言计算机设计人员常常必须在所期望获得的体系结构特点与实际用来制造一个系统的硬件之间进行折衷。在超级计算机的设计中,由于希望获得高速度,而这样又容易加大成本,因而这些折衷就更加重要了。今天,设计人员在以每秒1亿多次算术运算的峰值速度执行的系统上工作,用户费用高达1千多万美元。需要超级计算机设计人员另外考虑的是,在过去,超级计算机为多数用户提供的性能只是其峰值性能的一小部分(例如5％～10％)。通过大量计算获得高效率是当今超级计算机系统还未达到的一个目标。在八十年代初的五年中,由于种种限制,人们纷纷转向多处理机超级计算机的研制。单处理机超级计算机具有专门的向量指令,它可利用在科学计算中出现的大量向量数据。这些处理机依赖流水算术运算。

关键词：计算机设计 CEdAR系统多处理机算术运算向量指令并行性峰值速度向量形式时钟速度并行执行

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Low-loss and polarization insensitive 32×4 optical switch for ROAdM applications

引用

Light(Science & Applications) 2024年第5期13卷 875-884页

作者： Xiaotian Zhu Xiang Wang Yanlu Huang Liyan Wu Chunfei Zhao Mingzhu Xiao Luyi Wang Roy davidson Yanni Ou Brent E.Little Sai T.Chu department of Physics City University of Hong KongTat Chee AvenueHong KongChina. QXP Technologies Inc. NO.15th Shanglinyuan 1st RoadXi’anShaanxi 710119China. State Key Laboratory of Information of Photonics and Optical Communications School of Electronic EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China

Integrated switches play a crucial role in the development of reconfigurable optical add-drop multiplexers(ROAdMs)that have greater flexibility and compactness,ultimately leading to robust single-chip *** decades of research on switches with various structures and platforms,achieving a balance between dense integration,low insertion loss(IL),and polarization-dependent loss(PdL)remains a significant *** this paper,we propose and demonstrate a 32×4 optical switch using high-index doped silica glass(HdSG)for ROAdM *** switch is designed to route any of the 32 inputs to the express ports or drop any channels from 32 inputs to the target 4 drop ports or add any of the 4 ports to any of the 32 express *** switch comprises 188 MachZehnder Interferometer(MZI)type switch elements,88 optical vias for the 44 optical bridges,and 618 waveguidewaveguide crossings with three-dimensional(3d)*** 1550 nm,the fiber-to-fiber loss for each express channel is below 2 dB,and across the C and L bands,below 3 *** each input channel to all 4 drop/add channels at 1550 nm,the loss is less than 3.5 dB and less than 5 dB across the C and L *** PdLs for all express and input channels to the 4 drop/add channels are below 0.3 dB over the C band,and the crosstalk is under−50 dB for both the C and L bands.

关键词： polarization ROAdM optical

来源：

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

作者： davidson

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：