1) dual X-ray absorptiometry
双能X线
1.
Aim:To investigate the influence of pre-or post-meal factor on the bone mineral density (BMD) measurement by dual X-ray absorptiometry(DXA) at lumbar spine in females.
采用美国GE公司Lunar型双能X线骨密度仪测量腰椎正位(L2～4)骨密度,每个年龄组选取10例作为实验组,于检查当日上午空腹状态下行腰椎骨密度测量,并于进餐约2h后行第2次腰椎骨密度测量。
3) dual-energy X-ray
双能X射线
1.
The dual-energy X-ray bone mineral density instrument,with the measuring control core which is based on the high speed and high performance C8051F020 Microcontroller,using VC++ to the high and the low energy data to carry on the analysis,has been designed and carried on the experiment with the dual-energy X-ray.
以高速高性能单片机C8051F020为测量控制核心,采用VC++对高、低两种能量的数据进行分析,设计并实现了应用双能X射线进行测量的骨密度仪,改善了单光子骨密度仪定位困难,测量精度差的缺点。
4) dual-energy X-ray technology
双能量X线技术
5) dual-energy X-ray absorptionetry
双能X线吸收法
1.
【Methods】 With random sampling 0～1-year-old infants from Wuhan,the dual-energy X-ray absorptionetry(DEXA) was applied to measure their BMD,176 infants whose BMD were under normal were randomly assigned to two groups,one was the intervention group,in which infants were accepted synthetical interventional measures included sleep,dietary structure,activity in outdoors and appropriate calcium supply.
【方法】随机抽取武汉地区0~1岁婴儿,采用双能X线吸收法(the dual-energy X-ray absorptionetry,DEXA)检测其骨密度,将BMD异常的婴儿176例随机分为两组:一组为干预组,从第一次测试之日起在睡眠、膳食结构、活动量、日照时间及补充维生素D和钙剂方面采取综合干预措施,另一组为对照组,采用自然育儿方法。
6) Dual-energy X-ray absorptiometry(DXA)
双能X线吸收法
1.
Aim: To measure the precision of bone mineral density(BMD)and body composition in rats using dual-energy X-ray absorptiometry(DXA) and evaluate its reliability.
目的:采用双能X线吸收法(DXA)进行大鼠骨密度(BMD)和身体软组织成分测量的精密度试验,探讨DXA对大鼠骨密度和身体软组织成分测量结果的可靠性。
补充资料：焊接线能量
焊接线能量
energy input
hanJ一ex一an nengllang焊接线能量(Energy Input)由移动热源输入给单位长焊缝的能量。焊接线能量是焊接过程中各种热现象的重要影响因素，它不但影响峰值温度的分布和冷却速度，还影响凝固时间，从而影响金属焊接接头的冶金特性和力学性能。其计算式为H~尸/v，式中H为线能量，J/mm;尸为由热源输入的总能量，W;v为热源移动速度，mm/s。若热源为电弧，则H~El/v，式中E为电弧电压，V;I为焊接电流，A。若要精确计算热源对焊件的作用，则Hne，~人，El/v，式中Hne:为净得线能量。fl为热传导系数，其值为实际传给工件的热能与热源产生的总能量之比。热影响区的宽度与H二:成正比，焊缝的冷速与H、，成反比，而凝固时间与之成正比。所以焊接线能量对金属焊接性有一定的影响。 (李维茜)
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条