厂房监控系统软件的设计与实现     

张聪  董玉德 《中国科技信息》2011,(7):133-134

根据厂房安防监控的实际问题,提出现场、前台、后台三层架构的解决方案。在阐述方案总体结构和硬件平台的基础上,设计软件框架,设计实现了信息检索、移动侦测算法、广域网监控等关键技术。实验表明,移动侦测算法比常规的移动侦测算法稳定性好效率高,监控软件成本低、易于维护、运行稳定,具有推广应用价值。  相似文献   

浅谈三维角色动画中人物动作的设计     

夏博 《科教文汇》2011,(12):62-63

随着科技与技术的迅速发展和逐渐成熟,三维动画领域逐步扩大,三维动画制作软件也随之增多。本文以三维软件与动画运动规律来讲解三维动画片中角色动画的制作方法。在三维角色动画片中,角色的动作表现是动画片的重要组成部分。  相似文献   

金属液滴的电毛细运动规律     

郭胜荣  刘润聪  戴晓天  王晓东  那贤昭 《中国科学院大学学报》2021,38(1):54-61

通过理论推导得出电毛细运动的公式,并通过自行设计的实验装置研究金属液滴在重力作用下,在NaOH-淀粉混合液中的电毛细运动规律。在上述模拟体系中施加电场,拍摄金属液滴的运动轨迹并进行图像处理,获得液滴的瞬时运动规律。研究发现施加电场后液滴的水平速度分量经历迅速增加到极大值、缓慢减小到稳定值以及维持稳定速度3个阶段。研究结果表明混合液黏度在853~1 760 mPa·s,电场强度在90~135 V/m或液滴半径在0.91~1.31 mm时液滴运动速度满足电毛细运动公式,即电毛细运动速度与电场强度和液滴半径成正比,与混合液黏度成反比。  相似文献   

有阻力抛体运动的数值分析     

王雁冰 《包头职业技术学院学报》2014,(1):44-46

分析了球体有空气阻力时的受力情况,建立了运动方程;用Runnge-kutta方法,借助计算机C语言求其数值解,据所得数据用Excel软件画出图线,并与无阻力时进行对比,得出有阻力与无阻力情况下球体能达到最大射程的抛射角度的差别。  相似文献   

正交各向异性薄膜沉浮运动流固耦合效应的数值研究     

隋晓飞  管子武  鲍麟 《中国科学院大学学报》2014,31(1):24-31

采用非线性有限单元法和非定常面元法,实现了正交各向异性矩形薄膜在拍动中的流固耦合数值模拟,并研究薄膜在小攻角沉浮运动时,在惯性力和气动力共同作用下的非定常变形响应及对应的气动特性. 结果显示,在相同的沉浮运动条件下,薄膜的柔性有助于改善其气动性能,即薄膜弦向、展向弹性模量减小,引起柔性变形幅度的较大增加,则作用于膜上的平均气动升力也相应显著增高,而平均升力与平均气动功率的比值仅略有降低.  相似文献   

档案工作时间论     

丁海斌 《档案学通讯》2012,(1):31-34

本文从哲学时空观的角度出发,分别论述了档案工作时间的过程性与连续性;档案工作的时间属性与档案管理三大体系;档案工作的时间属性与文档连续体的运动循环论;档案工作的时间属性与档案定义;档案工作的时间属性与档案管理的过程与环节等诸多档案学重要理论问题。  相似文献   

Generation of vertical angular momentum in single,double, and triple-turn pirouette en dehors in ballet     

Jemin Kim  Margaret A. Wilson  Kunal Singhal  Sarah Gamblin  Cha-Young Suh 《Sports biomechanics / International Society of Biomechanics in Sports》2014,13(3):215-229

The purpose of this study was to investigate the vertical angular momentum generation strategies used by skilled ballet dancers in pirouette en dehors. Select kinematic parameters of the pirouette preparation (stance depth, vertical center-of-mass motion range, initial shoulder line position, shoulder line angular displacement, and maximum trunk twist angle) along with vertical angular momentum parameters during the turn (maximum momentums of the whole body and body parts, and duration and rate of generation) were obtained from nine skilled collegiate ballet dancers through a three-dimensional motion analysis and compared among three turn conditions (single, double, and triple). A one-way (‘turn’) multivariate analysis of variance of the kinematic parameters and angular momentum parameters of the whole body and a two-way analysis of variance (‘turn’ × ‘body’) of the maximum angular momentums of the body parts were conducted. Significant ‘turn’ effects were observed in the kinematic/angular momentum parameters (both the preparation and the turn) (p < 0.05). As the number of turns increased, skilled dancers generated larger vertical angular momentums by predominantly increasing the rate of momentum generation using rotation of the upper trunk and arms. The trail (closing) arm showed the largest contribution to whole-body angular momentum followed by the lead arm.  相似文献   

Scapulothoracic kinematics during tennis forehand drive     

Isabelle Rogowski  Thomas Creveaux  Laurence Chèze  Raphaël Dumas 《Sports biomechanics / International Society of Biomechanics in Sports》2014,13(2):166-175

Scapular dyskinesis is recognized as an abnormality in the kinetic chain; yet, there has been little research quantifying scapular motion during sport tasks. Tennis forehand drives of eight highly skilled tennis players were studied to assess the scapulothoracic kinematics and evaluate repeatability using video-based motion analysis. Scapulothoracic downward/upward rotation, posterior/anterior tilt, and internal/external rotation were computed using an acromial marker cluster. On average, the upward rotation, anterior tilt, and internal rotation varied from 1° to 26°, from 7° to 32°, and from 42° to 100°, respectively, during the tennis forehand drive. During the backswing and forward swing phases of the forehand stroke, small changes were observed for the three scapular angle values, while all angles increased rapidly during the follow-through phase. This suggests that the tennis forehand drive may contribute to scapula dyskinesis, mainly due to the great amplitude in scapulothoracic anterior tilt and internal rotation observed during the follow-through phase. Knowledge of normal scapula motion during sport tasks performed at high velocity could improve the understanding of various sport-specific adaptations and pathologies.  相似文献   

The effect of active sitting on trunk motion     

《运动与健康科学(英文)》2014,3(4):333-337

BackgroundProlonged sitting is a risk factor for low-back pain. The primary purpose of this study is to determine if prolonged active sitting will result in increased trunk motion.MethodsFifteen healthy female participants volunteered to sit for 30 min on each of three surfaces including an air-cushion, a stability ball, and a hard surface. Trunk motion was monitored using a Vicon motion capture system, and foot center of pressure was collected with two AMTI force plates.ResultsOur findings indicated that the average speed of the trunk center of mass significantly increased with seating surface compliance. There were significant differences in right and left foot centers of pressure in the antero-posterior direction between the ball and air-cushion conditions and the ball and chair conditions.ConclusionActive sitting results in increased trunk motion and could have a positive effect on low-back health.  相似文献   

晕动习服运动处方的构建研究     

张玲燕  施开华 《体育科技文献通报》2014,(3):43-43,84

运用文献资料、逻辑分析等研究方法,以适应性规律和晕动康复案例作为基础,结合体育运动实践提供的晕动刺激,对晕动习服运动处方构建的构建进行了研究,旨在为患者晕动减轻晕动之痛苦。  相似文献