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268篇 您的检索式:作者名="Ewan"
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1Advances in optical engineering for future telescopes显示文摘Significant optical engineering advances at the University of Arizona are being made for design, fabrication, and construction of next generation astronomical telescopes. This summary review paper focuses on the technological advances in three key areas. First is the optical fabrication technique used for constructing next-generation telescope mirrors. Advances in ground-based telescope control and instrumentation comprise the second area of development. This includes active alignment of the laser truss-based Large Binocular Telescope(LBT) prime focus camera, the new MOBIUS modular cross-dispersion spectroscopy unit used at the prime focal plane of the LBT, and topological pupil segment optimization. Lastly, future space telescope concepts and enabling technologies are discussed. Among these, the Nautilus space observatory requires challenging alignment of segmented multi-order diffractive elements. The OASIS terahertz space telescope presents unique challenges for characterizing the inflatable primary mirror, and the Hyperion space telescope pushes the limits of high spectral resolution, far-UV spectroscopy. The Coronagraphic Debris and Exoplanet Exploring Pioneer(CDEEP) is a Small Satellite(Small Sat) mission concept for high-contrast imaging of circumstellar disks and exoplanets using vector vortex coronagraph. These advances in optical engineering technologies will help mankind to probe, explore, and understand the scientific beauty of our universe.Daewook Kim Heejoo Choi Trenton Brendel Henry Quach Marcos Esparza Hyukmo Kang Yi-Ting Feng Jaren NAshcraft Xiaolong Ke Tianyi Wang Ewan SDouglas 2021Opto-Electronic Advances2021,4,6:10
2大面积头罩上类金刚石薄膜均匀性研究显示文摘根据军用光学仪器对红外窗口薄膜厚度均匀性的特殊要求,采用Femm42软件对射频等离子体化学气相沉积系统中真空室内的电场进行模拟分析,通过改变DOME的高度,并加入一金属圆环,解决了头罩边缘脱膜的问题。并利用田口实验方法指导实验,以减少实验次数,尽快找出影响薄膜性能的主次条件,同时可以分析各工艺参数对结果的影响趋势,最终确定最佳的工艺参数,在大面积头罩上成功镀制了厚度均匀性小于3%,且能承受恶劣环境测试的类金刚石薄膜。付秀华 杨永亮 刘国军 李琳 潘永刚 Ewan Waddell 2013红外与激光工程2013,42,1:10
3利用废弃玻璃研制高附加值预制混凝土产品显示文摘本文简单介绍了在英国谢菲尔德大学进行的将废弃玻璃作为混凝土中水泥和/或骨料的替代材料生产实际预制混凝土制品的试验研究。这一研究项目被认为是迄今对废弃玻璃应用于实际混凝土产品中研究范围最为广泛的,共在全英各地的多个预制混凝土生产企业和一个预拌混凝土企业进行了19个工业性试验子项目,配制了98个实际玻璃混凝土产品,并对这些产品依据现有英国国家标准进行了产品适应性能和碱骨料反应测试。试验结果表明:(1)玻璃混凝土制品具有与对比混凝土相当的产品性能;(2)采用混凝土棱柱体法一年的碱骨料反应测试结果表明绝大部分产品的膨胀值接近于零,只有个别产品由于使用了高碱含量的水泥而导致膨胀。此外,还在试验室配制了大量的彩色玻璃混凝土样品并对其进行了酸蚀或抛光处理。朱惠英 Ewan A Byar 2005混凝土2005,,8:10
4超细粉煤灰在混凝土中的应用显示文摘通过对超细粉煤灰 (SPFA)和常规粉煤灰 (PFA)减水性能的对比试验 ,发现SPFA具有良好的减水性能 ,并通过大量的掺加SPFA和PFA的混凝土试验配合比得到证实。对混凝土抗压强度发展趋势的分析表明SPFA作为水泥替代材料具有良好的胶凝性能 ,可将其应用于高强高性能混凝土中。朱惠英 Ewan A Byars 2002混凝土2002,,3:4
5Tree-ring reconstruction of streamflow for Palgong Mountain forested watershed in southeastern South Korea显示文摘Tree-ring chronologies from pine,oak and black locust tree species were used to reconstruct annual streamflow and examine hydrological drought years for Palgong Mountain forested watershed in southeastern South Korea for the period from 1954-2015. The backward elimination multiple regression analysis provided the statistically significant predictor chronologies of streamflow. The final calibration and verification test models accounted for 84.8% and 81.6%,respectively,of the variability in streamflow observed in the gage data. Further verification of the validity of the reconstructed model was undertaken with the Pearson Correlation Coefficient,the Reduction of Error Test,and the Durbin-Watson Statistics and indicated fidelity of the model for reconstructing the annual streamflow. Analyses of the reconstructed annual streamflow indicate that the most persistent years of high flows above the median annual discharge occurred from 1986-2008.This period included 7 single or multiple years of highest flow above the 90 th percentile discharge and multiple years of high flows with a time interval of 2-6 years,although with intervening multiple years of low flows below the 10 th and 50 th percentile. In comparison,the most persistent years of low flows below the median annual discharge occurred from 1954-1985 and 2009-2015. This period included 8 single or multiple years of lowest flow below the 10 th percentiledischarge and multiple years of low flows with a time interval of 2-9 years,although also with intervening multiple years of high flows above the 50 th percentile. No single years of extreme hydrological droughts below the 10 th percentile were identified from 1986-2015 whereas a greater proportion of high flows above the 90 th percentile occurred during this period. The persistent single or multiple years of lowest flows between 1954 and 1985 were the recent most critical hydrological drought years identified in the Palgong Mountain forested watershed providing supportive evidence of the severity of past hydrological droughts during that period,applicable to the southeastern South Korea where the study watershed is located. This interpretation agrees with the hydrological drought event years identified from 1951 to the early 1980 s in a related national study that used precipitation proxy data to reconstruct past occurrences of droughts in Korea.EWANE Basil Ewane Heon-Ho LEE 2017Journal of Mountain Science2017,14,1:3
6Management of opioid side effects in cancer-related and chronic noncancer pain: a systematic review显示文摘Ewan McNicol Nathalie Horowicz-Mehler Ruth A Fisk Kyle Bennett Maria Gialeli-Goudas Priscilla W Chew Joseph Lau Daniel Carr 2003Journal of Pain2003,,5:3
7患勃起功能障碍的男性应该检查其心血管问题吗?显示文摘具有重要里程碑意义的Massachusetts老年男性研究结果让我们对勃起功能障碍fED)的发病有了新的理解,同时也让我们认识到ED是一种老龄化疾病。在过去很多年里,ED已经在一些患者中被认为与心血管疾病(CVD)的形成有关。也有证据显示ED与CVD有共同和类似的风险因子。CVD是最容易鉴别的死亡原因之一。预防cVD引发死亡的早期筛查也成为许多学者热捧的领域。因此,很多学科都对“ED是否可以作为CVD的标志”这一提案产生了浓厚的兴趣。事实上,已经有了一些将ED用作CVD发病筛查工具的提案。因此,本文在两个主要数据库中(Pubmed和Cochrane library)进行了全面检索。关键词为:急性心肌梗塞(AMI),冠状动脉疾病(CAD)和勃起功能障碍(ED)。本文浏览了2000年1月至2011年6月期间发表的所有讨论ED和cVD关系的英文文章。对包括所有相关的随机对照试验,队列以及回顾性研究,综述进行分析,以探讨是否所有ED患者应该进行CVD的临床评估。结果显示,在一些患者中,ED与将来CVD的发病有关,但ED不是一个独立的,比传统的Framingham风险因子更好的预测因子。然而,这样的CVD筛查对于患有严重ED的年轻患者以及同时有其他CVD风险因素的患者是有好处的。Kenneth A Ewane Hao-Cheng Lin Run Wang 2012Asian Journal of Andrology2012,14,1:2
8Clinically active Crohn’s disease in the presence of a low C-reactive protein显示文摘Timothy H. J. Florin Ewan W. J. Paterson Elizabeth V. Fowler Graham L. Radford-Smith 2006Scandinavian Journal of Gastroenterology2006,,3:2
9An integrated approach for machine-learning-based system identification of dynamical systems under control:application towards the model predictive control of a highly nonlinear reactor system显示文摘Advanced model-based control strategies,e.g.,model predictive control,can offer superior control of key process variables for multiple-input multiple-output systems.The quality of the system model is critical to controller performance and should adequately describe the process dynamics across its operating range while remaining amenable to fast optimization.This work articulates an integrated system identification procedure for deriving black-box nonlinear continuous-time multiple-input multiple-output system models for nonlinear model predictive control.To showcase this approach,five candidate models for polynomial and interaction features of both output and manipulated variables were trained on simulated data and integrated into a nonlinear model predictive controller for a highly nonlinear continuous stirred tank reactor system.This procedure successfully identified system models that enabled effective control in both servo and regulator problems across wider operating ranges.These controllers also had reasonable per-iteration times of ca.0.1 s.This demonstration of how such system models could be identified for nonlinear model predictive control without prior knowledge of system dynamics opens further possibilities for direct data-driven methodologies for model-based control which,in the face of process uncertainties or modelling limitations,allow rapid and stable control over wider operating ranges.Ewan Chee Wee Chin Wong Xiaonan Wang 2022Frontiers of Chemical Science and Engineering2022,16,2:2
10Recurrence and survival after surgical management of rectal cancer显示文摘Alison Ross Conrad Rusnak Brian Weinerman Peter Kuechler Allan Hayashi Gordon MacLachlan Ewan Frew William Dunlop 1999The American Journal of Surgery1999,,5:2
11Perfluorinated Compounds in Aquatic Organisms at Various Trophic Levels in a Great Lakes Food Chain显示文摘Kurunthachalam Kannan Lin Tao Ewan Sinclair Stephanie D Pastva Dave J Jude John P Giesy 2005Archives of Environmental Contamination and Toxicology2005,,4:1
12Safety and efficacy of twice-daily exenatide in Taiwanese patients with inadequately controlled type 2 diabetes mellitus显示文摘Chieh-Hsiang Lu Ta-Jen Wu Kuang-Chung Shih Ewan Ni Victoria Reed Maria Yu Wayne H-H Sheu Lee-Ming Chuang 2012Journal of the Formosan Medical Association2012,,:1
13Effect of excess dietary copper,iron or zinc on the tocophero l and selenium status of grow ing pigs显示文摘Dove C R Ewan R C 1990J A nim Sci1990,68,8:1
14BSACI guidelines for the management of drug allergy 显示文摘Mirakian R Ewan PW Durham SR 2010Clin Exp Allergy2010,40,5:1
15, Chung M The Substitution of Information Technology for Other Factors of Production : A Firm Level Analy- sis 显示文摘ewan S 1997Management Science1997,43,12:1
16The steering of higher education systems : a public management perspective显示文摘Ewan Ferlie Christine Musselin Gianluca Andresani 2008High Educ2008,,2008:1
17Human calcitonin gene-related peptide activates adenylate eyelase and releases prostacyclin from human umbilical vein endothelial cells显示文摘Crossman D Mc Ewan T Macdermot J 1987Br J Pharmacol1987,92,:1
18Solar cell efficiency ta-bles(version 41)显示文摘Martin A Green Keith Emery Yoshihiro Hishikawa Wil-helm Warta and Ewan D Dunlop 0,,:1
19Effect of level of intake and diet dilution on energy metabolism in the young pig显示文摘DE GOEY L W EWAN R C 1975Journal of Animal Science1975,40,6:1
20Structure and functional properties of caseinate and whey protein isolate as affected by temperature and pH显示文摘Lee SY Mort CV Ewan YW 1992Journal of Food Science1992,57,5:1
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