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6篇 您的检索式:作者名="K.Campbell"
    题名 作者 年代 出处 被引量
1Old and New Public Administration in the 1970''''s显示文摘Alan K.Campbell 0,,04:1
2What interventions should we add to weight reducing diets in adults with obesity? A systematic review of randomized controlled trials of adding drug therapy, exercise, behaviour therapy or combinations of these interventions显示文摘A.Avenell T. J.Brown M. A.McGee M. K.Campbell A. M.Grant J.Broom R. T.Jung W. C. S.Smith 2004Journal of Human Nutrition and Dietetics2004,,4:1
3A system for probing Casimir energy corrections to the condensation energy显示文摘In this article,we present a nanoelectromechanical system(NEMS)designed to detect changes in the Casimir energy.The Casimir effect is a result of the appearance of quantum fluctuations in an electromagnetic vacuum.Previous experiments have used nano-or microscale parallel plate capacitors to detect the Casimir force by measuring the small attractive force these fluctuations exert between the two surfaces.In this new set of experiments,we aim to directly detect the shifts in the Casimir energy in a vacuum due to the presence of the metallic parallel plates,one of which is a superconductor.A change in the Casimir energy of this configuration is predicted to shift the superconducting transition temperature(T_(c))because of the interaction between it and the superconducting condensation energy.In our experiment,we take a superconducting film,carefully measure its transition temperature,bring a conducting plate close to the film,create a Casimir cavity,and then measure the transition temperature again.The expected shifts are smaller than the normal shifts one sees in cycling superconducting films to cryogenic temperatures,so using a NEMS resonator in situ is the only practical way to obtain accurate,reproducible data.Using a thin Pb film and opposing Au surface,we observe no shift in T_(c)>12µK down to a minimum spacing of~70 nm at zero applied magnetic field.Diego Perez-Morelo Alexander Stange Richard W.Lally Lawrence K.Barrett Matthias Imboden Abhishek Som David K.Campbell Vladimir A.Aksyuk David J.Bishop 2020Microsystems & Nanoengineering2020,6,1:1
4Interventions for preventing obesity in childhood. A systematic review显示文摘K.Campbell E.Waters S.O'Meara C.Summerbell 2001Obesity Reviews2001,,3:1
5Analysis of a Casimir-driven parametric amplifier with resilience to Casimir pull-in for MEMS single-point magnetic gradiometry显示文摘The Casimir force,a quantum mechanical effect,has been observed in several microelectromechanical system(MEMS)platforms.Due to its extreme sensitivity to the separation of two objects,the Casimir force has been proposed as an excellent avenue for quantum metrology.Practical application,however,is challenging due to attractive forces leading to stiction and device failure,called Casimir pull-in.In this work,we design and simulate a Casimir-driven metrology platform,where a time-delay-based parametric amplification technique is developed to achieve a steady-state and avoid pull-in.We apply the design to the detection of weak,low-frequency,gradient magnetic fields similar to those emanating from ionic currents in the heart and brain.Simulation parameters are selected from recent experimental platforms developed for Casimir metrology and magnetic gradiometry,both on MEMS platforms.While a MEMS offers many advantages to such an application,the detected signal must typically be at the resonant frequency of the device,with diminished sensitivity in the low frequency regime of biomagnetic fields.Using a Casimir-driven parametric amplifier,we report a 10,000-fold improvement in the best-case resolution of MEMS single-point gradiometers,with a maximum sensitivity of 6 Hz/(pT/cm)at 1 Hz.Further development of the proposed design has the potential to revolutionize metrology and may specifically enable the unshielded monitoring of biomagnetic fields in ambient conditions.Josh Javor Zhancheng Yao Matthias Imboden David K.Campbell David J.Bishop 2021Microsystems & Nanoengineering2021,7,5:0
6“身处危难”之中的DBA们——介绍两种不同的数据库管理工具显示文摘正当DBA们对不断增长的日常工作量一筹莫展时,作者为他们带来了两款可以帮助他们减轻压力的数据库管理软件,虽然价格都颇为不菲,但阅读完本文后,你会觉得它们物有所值。Michael K.Campbell 杨岩(译) 2006Windows IT Pro Magazine(国际中文版)2006,,12:0
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