ptv

Study on the PTV Technique and 3D Movement of Particles

PTV技术和颗粒三维运动规律的研究

Development of the Microscopic PIT / PTV System for Two-Phase Flows

两相流显微PIV/PTV系统的开发

Simulation System composed by ramp controllers , data transfer interface software and PTV traffic simulation software .

仿真系统由匝道控制器、数据传输接口软件和PTV交通仿真软件组成。

Investigation to Gas-Particle Two-Phase Flow in CFB using PTV Technology

采用PTV技术研究循环流化床内气固两相流动

Research on particle collision applying PTV Technology

应用PTV技术对颗粒碰撞规律的研究

Large volume injection of samples with a temperature-programmed vaporizer ( PTV ) system was investigated .

探讨了具有溶剂排空模式的程序升温蒸发（PTV）对大体积进样的作用。

The software system is composed by the improved circle extraction algorithm , various image processing algorithms and PIV / PTV algorithms .

软件系统由改进的球形颗粒图像识别算法、各种图像处理算法和各种先进的PIV/PTV算法组成。

Results ① 90 % isodose curve in all the four plans could cover 100 % of the PTV ;

结果①90%的等剂量曲线四种条件下均能覆盖100%的PTV；

The principle of PTV and its phosphor 's property in Luminesence

投影电视的原理及其三基色荧光粉的发光性质

Objective To study the clinical effects of patient-triggered ventilation assist / control ( PTV A / C ) support on respiratory failure in neonates .

目的探讨患者触发通气（PTV）辅助/控制（A/C）模式治疗新生儿呼吸衰竭的临床疗效。

PIV method uses Fast Fourier cross correlation , PTV method needs the center of every air bubble image , finds bubble pairs and then calculates velocity .

PIV算法采用快速傅立叶互相关分析法，而PTV算法需要获得每幅图像中每个气泡的形心，根据连续图像中的粒子对，计算速度。

The PTV of test matrix is different for each other , but has same weight value . And the weight value can be appointed by fault diagnosis system designer .

在其生成的测试矩阵中各PTV互不相同，但都具有相同的权值，而权值可以由故障诊断系统的设计者予以指定。

Based on what mentioned above , dispatch problems of static and dynamic state for PTV are studied and discussed with genetic algorithm ( GA ) and Hybrid GA .

进一步运用遗传算法和混合遗传算法进行了公交车辆静态调度方法和动态调度策略研究。

The influence of parameter setting on calculation accuracy and calculation time is studied , and compared the matching rate , error matching rate and computing time of the four PTV algorithms .

本文研究了各算法中参数设定对计算精度，计算速度等的影响，并比较了四种PTV算法的匹配率、误匹配率及运算时间，分析了四种算法的特点及适用性。

With the help of mechanical design and software control high-speed motor , high-level transducer and high-speed CCD is combined for the new PTV rheometer for polymer melts .

借助于机械设计和软件控制这些手段将高扭矩电机、高频率扭矩传感器和高速CCD（数字摄像机）整合成为完整的高分子熔体PTV流变仪。

Objective To study the measurement of the movement of residue thoracic stomach after surgical resection for esophageal cancer and define the optimal planning target volume ( PTV ) .

目的为了获得胸腔残胃肿瘤精确照射的适宜合理计划靶体积（PTV），进行了放疗中胸腔残胃位置移动的观察，目的是为确定三维适形放疗PTV的适宜范围。

The prescribed dose was 45 Gy at PTV for whole pelvic irradiation , and 60 Gy at CTV for recurrent patients .

盆腔预防性放疗PTV处方剂量为45Gy，复发患者CTV处方剂量为60Gy。

In order to make a meaningful comparison , it was defined that the 95 % isodose surface had to cover 100 % of the PTV in each plan ;

剂量均采用百分剂量，95%的等剂量面必须包括100%的计划靶体积（PTV）。

With regard to actual case and operation environment of public traffic vehicles ( PTV ), intelligent dispatching method of PTV is studied by using intelligent characteristics of genetic algorithm ( GA ) .

针对公交车辆调度现状及所处的运营环境，利用遗传算法（GeneticAlgorithm，GA）的智能化特征，进行了公交车辆智能调度方法的研究。

The paper introduces the general situation of America PTV and analyses the developing space of educational TV in our country . It also presents some points of view considering our educational development through comparing study .

本文从经费筹措、节目播出形式等方面介绍了美国公共电视事业发展概况，分析了我国教育电视事业的发展空间，并通过对比研究对我国教育电视事业的发展提出了看法。

Results : ( 1 ) 3D-CRT plans could generally meet the demand of dose-volume constraints for PTV ( Planning Target Volume ) but less conformity for organs at risk .

结果：（1）三维适形放疗计划可满足计划靶体积（PTV）剂量要求，但重要器官的剂量分布较差。

Conclusion The organ motion range in the direction of Z axis induced by respiration is reduced by ventral thoracic covering , which is important to reduce the range of PTV .

结论用胸腹体罩可减少呼吸所产生的器官上下（Z轴）移动的范围，对减少PTV范围有显著意义。

These technology makes the tumors in the plan target volume ( PTV ) and shape more close to the clinical target volume ( CTV ), dose distribution on target area conformal better adjust .

这些技术使得计划中的肿瘤靶区的容积和形状（PTV）更加贴近临床靶区容积（CTV），靶区剂量与分布适形性得到更好的调整。

Split vent flow , purge time , PTV system temperature , and maximum sample volume were optimized . In comparison with conventional methods , the detection limits were improved by one order of magnitude .

通过对分流排空量、吹扫时间、PTV温度及其进样体积等PTV参数的优化，提高了检测灵敏度。

Hybrid IMRT planning reduced the maximum dose of PTV ( V105 % and V110 % ) significantly and has the best dosimetric uniformity .

HybridIMRT降低了PTV的最大剂量，明显减少了PTV中接受高剂量照射的区域（V105%、V110%），靶区剂量均匀性最好。

The velocity field measurement by use of the particle image velocimetry and particle tracking velocimetry ( PIV / PTV ) system in a tidal estuary model test has advantages of high speed and accuracy .

在潮汐河口河工模型试验中采用粒子测速（PIV/PTV）系统测量流场，具有快速、精度高的优点。

Nowadays the radiotherapy technology is quickly developing , from previous physical modulated intensity radiotherapy to biological modulated intensity radiotherapy , accordingly the accurate delineation of PTV is becoming more and more important .

现代放射治疗技术快速发展，从物理调强发展到生物调强，照射靶区的确定更为重要。

This article expounds basic principles of genetic algorithm , and with regard to actual status of public traffic vehicles , intelligent dispatching of PTV was studied with GA , and has carried on the simulation experiment .

阐述遗传算法GA（GeneticAlgorithm）的基本原理，针对公交车辆调度现状，利用遗传算法智能化特征，进行公交车辆调度研究，进行仿真实验。

When with the 20 ° wedge or with the 30 ° wedge , 95 % isodose curve could cover almost 100 % of the PTV , and CI were high .

加20°、30°楔形板，95%等剂量曲线覆盖接近100%的PTV，CI高；

Considering the confinement of traditional PIV algorithm , a new PTV algorithm based on correlation was developed and realized , which can improve the spatial resolution and accuracy , especially in measurement of flow with high velocity gradient .

鉴于传统PIV算法存在的分辨率和精度问题，本文发展了一种基于粒子成像相关特性的PTV算法，大幅度提高了PIV测量方法的空间分辨率与测量精度，尤其是在速度梯度比较大的流场中。