固体相变时光热位移信号的分析

本文给出了固体相变时光热位移信号的模型,提出了用迈克尔逊干涉装置检测固体相变的测量方案,并进行了分析。     

常村矿N3-3掘进工作面通风风量计算及局扇选型

为了保障井下工作面作业人员的身体健康和劳动安全,对常村矿N3—3掘进工作面风量分别按瓦斯涌出量、工作面人数、风速、局部通风机供风量及最小全压进行了计算,确定了工作面采用两台功率为45Kw的FBDN07．2型通风杌,并安设合适的局扇管理牌板．出风口距工作面不大于12m,风筒出风口必须上风筒圈,从而保证掘进巷道通风系统的正常运行,以达到安全生产的目的。     

基于灰色系统理论的绝对关联度图像边缘检测方法研究

边缘检测主要是对图像的灰度变化进行度量、检测.解决图像边缘的有无、真假、定向和定位.基于边缘检测的灰色系统理论中的绝对关联度方法对处理非典型规律的图像数据与其它一些方法相比,具有明显的优势.根据绝对关联度分析方法,将仿射变换和最小二乘法原理与绝对关联度模型相结合的边缘检测方法在克服绝对关联度分析方法的规范性和序数效应问题上有一定效果.     

音叉的速度共振与位移共振曲线的测量和研究

利用接收线圈和压电换能片2种传感器测得音叉受迫振动的速度、位移共振曲线,通过实验比较和理论分析,证明这2种传感器所测得的物理量并不相同,同时分析和验证了2种幅频曲线的区别。对影响位移共振曲线测量结果的阻尼系数进行讨论和分析,得出:用接收线圈做传感器测得的音叉共振曲线为速度共振曲线,而用压电换能片做传感器测得的音叉共振曲线为位移共振曲线。实验的研究有利于学生对受迫振动和共振概念的深入理解,也有利于对2种传感器的正确运用。     

环渤海区域理性协调发展的战略思考

科学发展观统领下的理性协调具有时空上的丰富内涵.环渤海区域理性协调发展战略的重点主要包括非均衡发展与均衡发展的协调、局部利益与整体利益协调、城市关系协调、城乡关系协调、产业布局协调、竞争与合作协调、市场机制与调控政策协调、内源型经济与外源型经济协调八个方面.理性协调是环渤海经济区理顺关系、加快发展的关键.落实理性协调发展战略应从区域一体化角度分析合作中存在的问题,选择切实有效的途径.     

A comparison of the agreement,internal consistency,and 2-day test stability of the InBody 720, GE iDXA,and BOD POD® gold standard for assessing body composition

The study compared the agreement, internal consistency, and measurement stability of the GE iDXA, BOD POD, and InBody 720. Body composition of 43 men and 37 women (31.4 ± 10.7 years; 90% Caucasian and 10% other) was assessed in triplicate using each method over two different days. Mean percent body fat (% BF) of the participants was different for all three machines (27.6 ± 10.0% [GE iDXA)] 25.6 ± 10.4% [BOD POD], and 21.3 ± 10.6% [InBody 720]; p < .05). The coefficient of variation for same day repeated measures was 1.06% (GE iDXA), 3.29% (BOD POD), and 2.97% (InBody 720). The coefficient of variation for 2-day repeated measures was 1.81% (GE iDXA), 4.61% (BOD POD), and 4.24% (InBody 720). The difference between the GE iDXA and BOD POD was within acceptable variability, while the InBody 720 significantly underestimated % BF. The internal consistency was highest for the GE iDXA, followed by the InBody 720, and then the BOD POD.     

3DS MAX中凹凸贴图与置换贴图比较

3DS MAX中给建模对象赋予材质时,要表现对象表面凹凸不平的效果,可以用凹凸贴图通道,置换贴图通道两种方法来完成．通过实例来辅助说明并比较这两种方法的利弊和适用范围．凹凸贴图通道渲染速度快,但渲染质量不高,适合于对渲染质量不高或是测试时使用;置换贴图通道会产生很多三角面,所以渲染质量很高,但渲染速度慢,适合于对渲染质量要求较高且机器配置较好时使用．     

平行光束在单层弱吸收Ⅱ型界面上反射时的纵向位移

提出了单层弱吸收Ⅱ型界面的一种构型,分析了TE偏振的平行光束在这种界面上反射时的纵向位移,并进行了计算.结果表明,存在着一个临界角,当入射角小于临界角时,其纵向位移随入射角的增大而增大,而当入射角大于临界角时,纵向位移则随入射角的增大而减小.此外,还分析了纵向位移随介质层厚度以及折射率等参数的变化情况.     

The influence of a 6.5% carbohydrate-electrolyte solution on performance of prolonged intermittent high-intensity running at 30°C

Nine male student games players consumed either flavoured water (0.1 g carbohydrate, Na⁺ 6 mmol · l^?1), a solution containing 6.5% carbohydrate-electrolytes (6.5 g carbohydrate, Na⁺ 21 mmol · l^?1) or a taste placebo (Na⁺ 2 mmol · l^?1) during an intermittent shuttle test performed on three separate occasions at an ambient temperature of 30°C (dry bulb). The test involved five 15-min sets of repeated cycles of walking and variable speed running, each separated by a 4-min rest (part A of the test), followed by 60 s run/60 s rest until exhaustion (part B of the test). The participants drank 6.5 ml · kg^?1 of fluid as a bolus just before exercise and thereafter 4.5 ml · kg^?1 during every exercise set and rest period (19 min). There was a trial order effect. The total distance completed by the participants was greater in trial 3 (8441 ± 873 m) than in trial 1 (6839 ± 512, P < 0.05). This represented a 19% improvement in exercise capacity. However, the trials were performed in a random counterbalanced order and the participants completed 8634 ± 653 m, 7786 ± 741 m and 7099 ± 647 m in the flavoured water (FW), placebo (P) and carbohydrate-electrolyte (CE) trials, respectively (P = 0.08). Sprint performance was not different between the trials but was impaired over time (FW vs P vs CE: set 1, 2.41 ± 0.02 vs 2.39 ± 0.03 vs 2.39 ± 0.03 s; end set, 2.46 ± 0.03 vs 2.47 ± 0.03 vs 2.47 ± 0.02 s; main

effect time, P < 0.01). The rate of rise in rectal temperature was greater in the carbohydrate-electrolyte trial (rise in rectal temperature/duration of trial, °C · h^?1; FW vs CE, P < 0.05; P vs CE, N.S.). Blood glucose concentrations were higher in the carbohydrate-electrolyte than in the other two trials (FW vs P vs CE: rest, 4.4 ± 0.1 vs 4.3 ± 0.1 vs 4.2 ± 0.1 mmol · l^?1; end of exercise, 5.4 ± 0.3 vs 6.4 ± 0.6 vs 7.2 ± 0.5 mmol · l^?1; main effect trial, P < 0.05; main effect time, P < 0.01). Plasma free fatty acid concentrations at the end of exercise were lower in the carbohydrate-electrolyte trial than in the other two trials (FW vs P vs CE: 0.57 ± 0.08 vs 0.53 ± 0.11 vs 0.29 ± 0.04 mmol · l^?1; interaction, P < 0.01). The correlation between the rate of rise in rectal temperature (°C · h^?1) and the distance completed was ?0.91, ?0.92 and ?0.96 in the flavoured water, placebo and carbohydrate-electrolyte conditions, respectively (P < 0.01). Heart rate, blood pressure, plasma ammonia, blood lactate, plasma volume and rate of perceived exertion were not different between the three fluid trials. Although drinking the carbohydrate-electrolyte solution induced greater metabolic changes than the flavoured water and placebo solutions, it is unlikely that in these unacclimated males carbohydrate availability was a limiting factor in the performance of intermittent running in hot environmental conditions.     

世界优秀女子铅球运动员背向滑步推铅球技术的生物力学分析

运用文献资料法、数理统计法和比较分析法,对2009年柏林世界田径锦标赛女子铅球前八名运动员的技术动作进行生物力学分析。结果表明：优越的身体形态条件是成为世界一流铅球运动员的基础;在滑步开始阶段奖牌获得者就具备了较高的身体重心速度,滑步和最后用力阶段与其他运动员没有太大区别,过渡阶段要高于其他运动员;过渡阶段奖牌获得者的肩轴和髋轴平均角速度大于其他运动员,两者之差呈减小趋势;在最后用力阶段奖牌获得者能在最短的时间获得较大的速度增量和加速度;出手速度是获得较好运动成绩的主导因素,出手角度、出手高度与运动员各自技术特点有一定的关系。