皮褶厚度推测昆明地区老年女性体脂率公式的研究

选取昆明地区退休的老年女性为研究对象,以双能量X光吸收法（DEXA）为校标,建立老年女性皮褶厚度推测体脂率公式.结果表明,皮褶厚度和全身体脂率相关性显著;昆明地区老年女性皮褶厚度推测全身体脂率公式为：全身体脂率=27.796＋0.321×肱三头肌部皮褶.建议在今后的研究中扩大昆明地区样本量和不同地区样本,进一步对该公式的有效性进行检验.     

基于ANSYS的脱挥器封头强度设计及优化

脱挥器封头结构不连续部位的应力情况十分复杂,设计时通常是凭借经验来确定各部位的壁厚。文章基于ANSYS Workbench有限元方法对脱挥器封头结构进行了应力分析,得到了各部位厚度对不连续处当量应力的敏感度,进行了优化设计。该方法不仅满足了结构强度要求,且用钢量最小,取得了较为理想的实验结果,对此类设备的设计具有一定的参考价值。     

任楼煤矿10煤层厚度变化成因探析

任楼煤矿10煤层位于山西组中部,结合10煤层变化的特点,分别从沉积环境、沼泽基底不均衡沉降和河流的同期冲刷、后期构造变动、基底不平、岩浆侵入作用等方面进行了分析研究,得出沉积环境、河流的同期冲刷、后期构造运动是影响任楼煤矿10煤层厚度变化的主要因素,沼泽基底不均衡沉降、基底不平影响甚微,与岩浆侵入无关的结论。这对充分利用煤炭资源和今后煤炭的开采具有重大意义。     

Correlation between architectural variables and torque in the erector spinae muscle during maximal isometric contraction

Abstract

This study analysed whether a significant relationship exists between the torque and muscle thickness and pennation angle of the erector spinae muscle during a maximal isometric lumbar extension with the lumbar spine in neutral position. This was a cross-sectional study in which 46 healthy adults performed three repetitions for 5 s of maximal isometric lumbar extension with rests of 90 s. During the lumbar extensions, bilateral ultrasound images of the erector spinae muscle (to measure pennation angle and muscle thickness) and torque were acquired. Reliability test analysis calculating the internal consistency (Cronbach's alpha) of the measure, correlation between pennation angle, muscle thickness and torque extensions were examined. Through a linear regression the contribution of each independent variable (muscle thickness and pennation angle) to the variation of the dependent variable (torque) was calculated. The results of the reliability test were: 0.976–0.979 (pennation angle), 0.980–0.980 (muscle thickness) and 0.994 (torque). The results show that pennation angle and muscle thickness were significantly related to each other with a range between 0.295 and 0.762. In addition, multiple regression analysis showed that the two variables considered in this study explained 68% of the variance in the torque. Pennation angle and muscle thickness have a moderate impact on the variance exerted on the torque during a maximal isometric lumbar extension with the lumbar spine in neutral position.     

Generalizability of the AAHPERD Health Related Skinfold Test

Abstract

Generalizability theory was utilized to investigate the amount of variation associated with various facets in the assessment of skinfolds as suggested by the American Alliance for Health, Physical Education, Recreation and Dance (AAHPERD) Health Related Physical Fitness Test. The facets utilized were testers, instruments, and repeated trials. Results indicate that the variation associated with the tester, instrument, and trial facets was small. Components of variance and G coefficients indicate that skinfold measures vary little depending upon the tester, instrument, or trial used. Suggestions are made for accurate assessment of the skinfolds recommended in the AAHPERD Health Related Physical Fitness Test.     

Effect of intensive multifactorial treatment on the intima-media thickness of large arteries in patients with new-onset type 2 diabetes mellitus

Objective  

To quantify the changes in blood glucose, blood lipids, blood pressure, and the intima-media thickness (IMT) of large arteries in patients with new-onset type 2 diabetes mellitus who received either intensive multifactorial treatment or conventional treatment.     

关于牛顿圈的几个问题

本文讨论了关于牛顿圈的五个问题