Design and Implementation of elevator car caller controller

随着社会的发展和科技的进步，众多的高层建筑和智能化建筑大量涌现。电梯作为现代建筑内部的交通工具，已成为人们生活中不可或缺的一部分。人们对电梯的智能化和安全性也提出了越来越高的要求。电梯控制领域经历了继电器控制技术，微机控制技术之后，现场总线控制技术也已开始逐步进入。相比其它类型的现场总线，CAN总线以其高性能与高可靠性赢得了工业界的高度认可，在众多领域被广泛应用。 本文论述的基于CAN总线的电梯轿厢呼梯控制器设计，以CAN总线方式实现与电梯主控制器的实时通信，轿厢内的楼层显示，语音播报和乘客在轿厢内的楼层选择等功能，使整个控制系统的控制信号线数量大为减少，增强了电梯运行的实时性控制，充分体...With the development of society and economy, high-rise buildings and intellectualizing buildings have increased greatly in number. Being the main transporter within buildings, elevators have become an indispensable part of people's lives. Hence, there's an increasing demand in the intelligentization and the security in elevator control system. Developed from the relay control and micro-computer co...学位：工学硕士院系专业：信息科学与技术学院自动化系_控制理论与控制工程学号：X200522301

Three-dimensional CT angiography for anatomic measurements of the carotid artery bifurcation

背景:解剖测量是临床医学的基础,可为临床影像学诊断与外科手术提供依据与参考。利用三维 CT 血管成像技术进行相关解剖测量具有明显的技术优势与很好的应用前景。目的:应用 64 排螺旋 CT 血管成像对颈动脉分叉部的形态结构进行测量,为相关研究提供解剖基础。方法:查阅 2008 年 6 月至 2010 年 6 月于厦门大学附属中山医院影像科行头颈部 64 排螺旋 CT 血管成像受检者的扫描图像,随机选取颈动脉分叉部无明显病变者 92 例。其中男 45 例,女 47 例;≤40 岁者40 例,> 40 岁者 52 例。利用其断面图像进行三维成像处理,获得满意的三维图像后,对颈动脉分叉部相关结构进行解剖学测量。结果与结论:三维图像可清晰显示颈动脉分叉部结构,实现其结构的单独和多结构、多方向观察及测量。测量结果显示受试者颈动脉分叉角为(43.5±12.3)°,颈总动脉远端内径(6.83±0.65) MM,颈内动脉膨大区近端内径(7.25±1.04) MM,颈内动脉膨大区最大内径(8.15±1.35) MM,颈内动脉膨大区远端内径(5.03± 0.55) MM,颈外动脉内径(4.22±0.60) MM。与≤40 岁组比较,>40 岁组颈动脉分叉角度、颈内动脉膨大区近端内径、颈内动脉膨大区最大内径、颈内动脉膨大区远端内径均明显粗大,颈外动脉内径明显细小(P 0.05)。与男性组比较,女性组颈动脉分叉部各测量指标均显著细小(P 0.05)。三维 CT 可客观、准确测量颈动脉分叉部相关解剖值,具有个体化特征,可为相关应用解剖、疾病诊断及介入或手术治疗提供客观依据。BACKGROUND: Anatomic measurement is the basis of clinical medicines.It can provide basis and reference for clinical diagnosis and surgical operation.The anatomical measurement with 64-spiral CT angiography has the obvious technical superiority and good application prospect.OBJECTIVE: To measure the anatomical structure of the carotid artery bifurcation with 64-spiral CT angiography, and to provide anatomic basis for relevant researches.METHODS: A total of 92 subjects, who underwent 64-spiral CT angiography in head and neck without any pathology of carotid artery bifurcation from June 2008 to June 2010, were selected from Department of Radiology, Zhongshan Hospital Xiamen University.There were 40 male cases (≤40 years old) and 52 female cases (> 40 years old).The cross-sectional images were processed with three-dimensional imaging to obtain the three-dimensional image and to measure the anatomical structure of the carotid artery bifurcation.RESULTS AND CONCLUSION: The three-dimensional images could clearly display the structure of carotid artery bifurcation and could achieve the mono- or multi-structure and multi-directional observation of structure.The measurement results showed the carotid artery bifurcation angle was (43.5±12.3)°, the distal inner diameter of the common carotid artery was (6.83±0.65) mm, the proximal inner diameter of the internal carotid artery enlargement area was (7.25±1.04) mm, the width of the internal carotid artery enlargement area was (8.15±1.35) mm, the distal inner diameter of the internal carotid artery enlargement area was (5.03±0.55) mm, and the inner diameter of the external carotid artery was (4.22±0.60) mm.Compared with the ≤ 40 years old group, the carotid artery bifurcation angle, proximal inner diameter of the internal carotid artery enlargement area, width of the internal carotid artery enlargement area and the distal inner diameter of the internal carotid artery enlargement area in the > 40 years old group were increased significantly, while the inner diameter of the external carotid artery was small (P 0.05).Compared with the male group, the measurement indexes of carotid artery bifurcation in the female group were significantly smaller (P 0.05).Three-dimensional CT image can objectively and accurately measure the anatomical values of carotid artery bifurcation.It has individual characteristics that can provide the objective basis for applied anatomy, disease diagnosis and surgery treatment.国家自然科学基金面上项目(81071214)~

Study of Gliding Arc Discharge Plasma

研究了滑动弧放电过程中电参数的变化，并对滑动弧等离子体中的非平衡度和各个参数之间的关系进行了讨论。应用双通道电弧模型，对电弧在气流作用下运动规律进行了数值模拟。模拟所得的结果有助于分析滑动弧非平衡等离子体的产生机理

带有屈服应力非牛顿流体搅拌中空穴的数学模型及CFD研究

搅拌槽作为过程工程中常常遇到的一种化工反应器,广泛的应用在矿物冶炼、废水处理、造纸以及食品工程等众多领域。工业搅拌中的工质往往为非牛顿流体,而搅拌带有屈服应力的流体往往会在搅拌桨周围形成混合较好的空穴和外部几乎不流动的死区两部分。准确的预测搅拌槽中的空穴形状和尺寸对于工业搅拌槽的设计和优化都有重要意义。现有的数学模型能适用于较低雷诺数的工况,但雷诺数偏高时,存在只适用于径流桨,或者没考虑空穴和壁面作用等问题,本文在环状模型的基础上做了相应改进,并考虑空穴和搅拌槽壁面作用,提出了对轴流桨体系也适用的修正环形模型。经过和实验数据以及CFD模拟结果的对比,发现在较低雷诺数时,各种模型都表现良好,但是...</p