查询词典 location

At the same time, combining with the actual condition of delivery pipeline of our country and some prevalent leak detection and location methods, this paper raised a method, which is based on wavelet analysis and negative- pressure-wave to detect and locate the leakage. Jobs in the paper are as follows:As affected by gas density, pressure, specific heat and pipe material, the velocity of negative-pressure-wave improved depending on the energy conservation. At one time, taking the affection of velocity of gas flow, the location formula was modified in some degree.When locating the leaks with location formula, the iterative approach algorithm was adopted as a new method to increase the location accuracy level of system.Multi-scale decomposition and reconstruction of wavelet transform is utilized to filter the noise of negative-pressure-wave, which was brought by leakage. With the capacity to detect the signal singularity fast and accurately, wavelet transform was used to catch the break point of pressure signal. The work improved the accuracy of At in location formula, accordingly improved the location accuracy.Wavelet is a suitable tool for signal analysis. The distinct character is that the mother-wavelet is of optional. That means choosing different mother-wavelet will get different analysis result. So we studied how to choose mother-wavelet and its scale for signal singularity detection. The method is to choose a wavelet by regularities of the wavelet and the signal.Finally, a plan, which bases on SCADA system for inspection and detection of natural gas leakage, is proposed in the article.

其中，主要进行了以下几方面的工作：针对泄漏产生的负压波在管道中的传播速度受媒介的密度、压力、比热及材质等因素的影响，而非声波在空气中传播的速度，本文利用能量守恒原理，对其进行了修正；考虑到管内气体流速对压力波速的影响，对原始的负压波定位公式进行了一定程度的改进，并在利用定位公式进行泄漏点定位时采用逐步迭代逼近算法，提高了系统的定位精度；利用小波变换的多分辨率分解和重构技术，对采集到的管道发生泄漏时产生的负压波信号进行了降噪处理；并利用小波变换技术对信号奇异点的快速、准确的识别能力，对经上述消噪后的负压波信号进行了奇异点捕捉，精确捕捉的结果提高了定位公式中上下游站点采集到的负压波奇异点的时间差△t的精度，从而进一步提高了定位的精度；考虑到小波变换是一种基波可变的信号分析工具，也就是说，不同的小波基波对信号分析的结果将有很大差别，这势必影响最终的处理结果，因此，我们又对比分析了本课题中小波基及尺度的选择问题，依据规则性系数相似性原理对母小波的选择进行了探索性研究；最后，还提出了基于SCADA的泄漏检测与定位系统的软件开发构想及系统的嵌入方案。

The Filter By Distance to UV Location compound reduces the number of particles based on their distance to a specific UV location on a NURBS surface or curve object.

Filter By Distance to UV Location（通过UV坐标距离过滤粒子发射）复合节点是通过测量到曲面或者是曲线的一个特殊的UV坐标来过滤粒子发射。

The category location of Xi'an Shiyou University:teaching university; hierarchy location of running the school: give priority to undergraduate course, positively develop postgraduate course; special subject location: focus on project, take petroleum and petrify as characteristic, theory、project、economy、manage、literature、law、education more subjects develop harmonizly; cultivate talent location: culture strong basic、take delight in dedicatory appliance advanced special man that petroleum interest and area economy society need; service location: depend on petroleum,base on shan xi, facing to the western, serve nationwide.

西安石油大学学校类型定位：教学研究型大学；办学层次定位：以本科教育为主，积极发展研究生教育；学科专业定位：以工为主，以石油石化为特色，理、工、经、管、文、法、教多学科协调发展；人才培养定位：培养石油行业和区域经济社会发展需要的基础扎实、乐于奉献的应用型高级专门人才；服务面向定位：依托石油，立足陕西，面向西部，服务全国。

Based on the analytical results and Rule K algorithm which constructs the connected dominating set, a location-independent connected coverage protocol is proposed.

根据分析结果，基于构建连通支配集CDS的Rule K算法，提出了一种与节点位置无关网络连通性覆盖协议LICCP(location-independent connected coverage protocol)。

New bar and floater response: Move To Location.

新的动作条和浮动按钮响应：Move To Location。

Location is within the bounds of any of our hot spots we have defined.

Location事件处理程序），是对我们在我们所定义的任何热点地区的范围。

One-location files Centralise file storage in one location.

一个位置的档案集中文件存储在一个location。

Location and General Description The hollow, four-chambered, muscular heart is roughly the size of a clenched fist.

Location和概述 The挖空，四有房间，肌肉心脏大致是一个握紧拳头的大小。

However, RFID stands for Radio Frequency Identification, and is also called as Electronic Label. It goes through radio signals to identify specific targets, and reading and writing information, as well as don't need identity system and specific targets to create such as electronic, optics or machinery. Properties of wireless communication, space-penetrating, information tracking and real-time location system/ RTLS will apply for increasing the system capability of safety and protection to Robot.

而「RFID， Radio Frequency Identification 」称之为「无线射频识别」，又称「电子标签」，是一种通信技术，可透过无线电讯号识别特定目标并读写相关资料，而无需识别系统与特定目标即可建立含电子、光学或机械接触，其特性：无线通讯、空间穿透性、资讯历程可追踪与「即时定位系统 RTLS， Real Time Location System」等，必然将成为机器人、机械手臂安全设计与防护的新应用。

node location is one of the key technologies in wireless sensor network.rssi－based location is a hotspot in nowadays.for resolving biggish error in rssi－based location,the paper presents a new method of location,rssi－based triangle and centroid location,using triangle and centroid method to reduce the error of rssi measurement.simulation experiments prove that this algorithm can obviously improve the location accuracy compared to trilateration.

摘 要：节点定位是无线传感器网络中的关键技术之一。基于rssi的定位技术是现阶段研究的热点，为解决rssi测量方法定位误差较大的问题，提出一种将rssi测量方法与三角形质心算法相结合的新型定位算法，该算法用三角形质心算法减小rssi的测量误差。仿真表明该算法比基于rssi的三边测量法定位算法的定位精度有较大提高。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。