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8篇 您的检索式:作者名="Jonathan Harper"
    题名 作者 年代 出处 被引量
1How Effective is Low Vision Service Provision? A Systematic Review显示文摘Alison M. Binns Catey Bunce Chris Dickinson Robert Harper Rhiannon Tudor-Edwards Margaret Woodhouse Pat Linck Alan Suttie Jonathan Jackson Jennifer Lindsay James Wolffsohn Lindsey Hughes Tom H. Margrain 2012Survey of Ophthalmology2012,,1:1
2Urgent Surgical Decompression Compared to Methylprednisolone for the Treatment of Acute Spinal Cord Injury: A Randomized Prospective Study in Beagle Dogs显示文摘Richard S. Rabinowitz Jason C. Eck C Michel Harper Dirk R. Larson Miguel A. Jimenez Joseph E. Parisi Jonathan A. Friedman Michael J. Yaszemski Bradford L. Currier 2008Spine2008,,21:1
3Risk Factors for Renal Cell Carcinoma in the Vitamin and Lifestyle (VITAL) Study显示文摘Liam C. Macleod James M. Hotaling Jonathan L. Wright Michael T. Davenport John L. Gore Jonathan Harper Emily White 2013The Journal of Urology2013,,:1
4Cystic renal cell carcinoma carries an excellent prognosis regardless of tumor size显示文摘Brian R. Winters John L. Gore Sarah K. Holt Jonathan D. Harper Daniel W. Lin Jonathan L. Wright 2015Urologic Oncology: Seminars and Original Investig2015,,12:1
5如何实现高功率密度的工业电源显示文摘工业电源必需满足一些特殊的要求,如低功耗(以减轻机箱冷却方面的负担)、高功率密度(以减小空间要求)、高可靠性和高耐用性,以及其它在普通电源中不常见的特性,如易于并联、遥控和某些过载保护功能等。Jonathan Harper Michael Weirich Alfred Hesener 2009世界电子元器件2009,,6:0
6选择正确的MOSFET:工程师所需要知道的显示文摘随着制造技术的发展和进步,系统设计人员必须跟上技术的发展步伐,才能为其设计挑选最合适的电子器件。MOSFET是电气系统中的基本部件,工程师需要深入了解它的关键特性及指标才能做出正确选择。本文将讨论如何根据RDS(ON)、热性能、雪崩击穿电压及开关性能指标来选择正确的MOSFET。Jonathan Harper Enrique Rodriguez 2007今日电子2007,,11:0
7电源模块设计考量及逆变器电机驱动的优化显示文摘当今的电机驱动器使用变频器来控制电机的速度和转矩。使用变频器不仅可以提高在全速运行时的能效,而且进一步节能。智能功率模块(IPM)是用于可变速驱动器的一项赋能技术,把逆变器和内部驱动器集成在单个模块中。对于低功率工业三相交流输入应用,IPM模块和凝胶填充模块都已得到广泛使用。安森美半导体TMPIM系列可以将转移成型模块的使用范围扩大到更高的功率水平,还为工业电机驱动器的逆变器设计人员提供方便、紧凑、可靠的方案。Jonathan Harper 2020变频器世界2020,,9:0
8An enhanced functional ability questionnaire(faVIQ) to measure the impact of rehabilitation services on the visually impaired显示文摘AIM: To develop a short,enhanced functional ability Quality of Vision(faVIQ) instrument based on previous questionnaires employing comprehensive modern statistical techniques to ensure the use of an appropriate response scale,items and scoring of the visual related difficulties experienced by patients with visual impairment. · METHODS: Items in current quality-of-life questionnaires for the visually impaired were refined by a multi-professional group and visually impaired focus groups. The resulting 76 items were completed by 293 visually impaired patients with stable vision on two occasions separated by a month. The faVIQ scores of 75 patients with no ocular pathology were compared to 75 age and gender matched patients with visual impairment. ·RESULTS: Rasch analysis reduced the faVIQ items to 27. Correlation to standard visual metrics was moderate(r =0.32-0.46) and to the NEI-VFQ was 0.48. The faVIQ was able to clearly discriminate between age and gender matched populations with no ocular pathology and visual impairment with an index of 0.983 and 95% sensitivity and 95% specificity using a cut off of 29.·CONCLUSION: The faVIQ allows sensitive assessment of quality-of-life in the visually impaired and should support studies which evaluate the effectiveness of low vision rehabilitation services.James Stuart Wolffsohn Jonathan Jackson Olivia Anne Hunt Charles Cottriall Jennifer Lindsay Richard Gilmour Anne Sinclair Robert Harper 2014International Journal of Ophthalmology(English edition)2014,7,1:0
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