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再论测速对NMR测井数据的影响
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作者 查传钰 车文华 《国外测井技术》 1999年第1期34-38,42,共6页
连续NMR测井没于实验室静态测量,由于仪器的运动,可能从多个方向造成测量信号幅度的衰减,同时也会使是的视T2时间偏小。如果忽略这一影响,就很可能给NMR资料 的释为较大的误差。
关键词 NMR测井 磁化强度 弛豫时间 测速影响 测井
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Considerations when using the activPAL monitor in field-based research with adult populations 被引量:5
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作者 Charlotte L.Edwardson Elisabeth A.H.Winkler +4 位作者 Danielle H.Bodicoat Tom Yates Melanie J.Davies David W.Dunstan Genevieve N.Healy 《Journal of Sport and Health Science》 SCIE 2017年第2期162-178,共17页
Research indicates that high levels of sedentary behavior(sitting or lying with low energy expenditure) are adversely associated with health. A key factor in improving our understanding of the impact of sedentary beha... Research indicates that high levels of sedentary behavior(sitting or lying with low energy expenditure) are adversely associated with health. A key factor in improving our understanding of the impact of sedentary behavior(and patterns of sedentary time accumulation) on health is the use of objective measurement tools that collect date and time-stamped activity information. One such tool is the activP AL monitor. This thigh-worn device uses accelerometer-derived information about thigh position to determine the start and end of each period spent sitting/lying, standing, and stepping, as well as stepping speed, step counts, and postural transitions. The activP AL is increasingly being used within field-based research for its ability to measure sitting/lying via posture. We summarise key issues to consider when using the activP AL in physical activity and sedentary behavior field-based research with adult populations. It is intended that the findings and discussion points be informative for researchers who are currently using activP AL monitors or are intending to use them. Pre-data collection decisions, monitor preparation and distribution, data collection considerations, and manual and automated data processing possibilities are presented using examples from current literature and experiences from 2 research groups from the UK and Australia. 展开更多
关键词 populations monitor lying collection accelerometer expenditure Australia stepping currently intended
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