查询词典 at time

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。

Face the unprecedented opportunity and challenges, be the university student the study English means to control a language, mean increased for oneself a pair of can at and at that time understand the world of eye, mean once and opportunity of outside exchanges, we can use English toward world to introduce the Chinese splendid history culture at the same time, letting the world promote the understanding to China, also promoting the China and comity between other nations of worlds.

面对着前所未有的机遇和挑战，当大学生学习英语就意味着掌握了一门语言，意味着给自己增加了一双可以在第一时间了解世界的眼睛，意味着一次与外界交流的机会，同时我们可以用英语向世界介绍中国光辉灿烂的历史文化，让世界增进对中国的了解，也增进中国与世界其他国家之间的友谊。

Observers of the annual elitist confab known as Bilderberg have long known that plans discussed at the conference quickly become reality. In 2002, Bilderberg researcher Jim Tucker correctly predicted that the Iraq war (not late 2002, as many were predicting at the time). In 2006, Daniel Estulin correctly forecast and subsequent economic crash, a possibility that most talking heads in the corporate media at the time.

比尔德伯格俱乐部的年度精英人物会议的观察者们早就知道在会议上讨论的计划会很快成为现实。2002年，彼尔德伯格研究员Jim Tucker正确预测伊拉克战争（而不是像许多人预测的2002年年底）。2006年，Daniel Estulin正确预测了经济危机并且描述了它的结果，当时仅仅是一种在公司媒体上的舆论倾向可能性。

Engine room counting fee management application, project structure and expansion solution guidebook A PC product need analysis: Engine room application besides need towards function had special request outside, other summarize to have 4:00:(1) PC fundamental that PC that stability, engine room use is up is everyday 24 hours request for be placed inning openning the machine and circulating the appearance, stability towards PC having more and strictly, then request PC at any time high low temperature start, stanza can manage, power supply manage, inside memory manage and keep on worked deathless machine very and strictly, this is not is what DIY can make to, these factors must be in the product system design inside factor that consider, at the same time at the factor that the machine produce adopt a 48 hour development test the machine can discover latent influence system stability;(2) PC of can manage the sex, engine room as if teach Teach the profession's electronics classroom, and management engine room as if management teacher to electronics teacher, and this is the PC network management, namely on-line management, for example early the machine of many sets proceed together the OS to install, application the procedure install, hardware management, usage supervise and control and report to the police the etc.

机房应用除了对性能有特殊要求之外，其它的需求概括起来有4点：（1）PC的稳定性，机房用的PC基本上是每天24小时处于开机及运行状态，对PC的稳定性有更加严格的要求，即对PC 随时高低温启动、节能管理、电源管理、内存管理以及持续工作不死机的要求非常严格，这并非是DIY所能做到的，这些因素必须是在产品系统设计中考虑的因素，同时在机器生产时采用48小时动态考机才能发现潜在的影响系统稳定性的因素；（2）PC的可管理性，机房如同教育行业的电子教室，对机房的管理如同对教师对电子教师的管理，这就是PC的网络管理，即在线管理，例如初始化多台机器并行OS安装、应用程序安装、硬件管理、使用监控以及报警等管理功能，针对机房PC，专门开发机房管理软件，实现对机房PC的管理；（3）易用性要求，机房PC如同傻瓜PC，在客户端不需要安装、设置，只须开机，满足易用性要求；（4）健康要求：静电、电磁辐射指标、显示器防眩、键盘鼠标抗菌设计及符合人体公学设计。

The bioaerosols are at the highest levels during the lunch time period. With either the impactor method or the sedimentation method, one of the major contributing factors is the crowdedness due to many students all at lunch at the same time.

主成分分析结果发现，无论是冲击式采样法或自然沉降法，用餐状态为影响学生餐厅空气中微生物含量的主要因子。

Autumn again, I remembered last autumn at this time, I walked on the lawn all full of defoliation, I imagined next year where I am at this time, ok, autumn again, I still at originally of place didn't move footstep, because of too oppressive.

秋天 又是一年秋天，记得在去年秋天的这个时刻，走在满是落叶的草地上心中有无限的感慨，想象着下一年的秋天自己将身处何处，是啊，又是一年的秋天，我还是在原来的地方原地踏步没有怎么挪动自己的脚步，因为太过沉重。

00 At night, I went to the radio. Because almost no one was on duty at night, and i was familiar with it, i entered the director room easily. A man was busy dialing, with a piece of paper before him, which was fully written with phone numbers and answers. He dialed one by one and ordered the same fake customers as me on the other end of the phone the answers they should say later. My arriving alerted him a little, looking back at me doubtingly. I pointed the host in the live broadcasting room the other side of the glass partition, and waved. After the host responded with a smiling face, he left me alone, and continued to dial. I pulled a stool and sat beside him, watching him busy about. From time to time, he would scold, because several calls put through but the other side was unwilling.

晚上8点我到了电台，因为晚上也没有什么人值班，再说对我也还熟悉，我很轻松的到了导播间，一个男子正在忙碌的打电话，面前放着一张纸，上面写满了电话号码和答案，他一个一个的拨打和交代电话那端"象我一样的托"，等下要说的答案，我的到来让他略显警觉，回头疑问的看着我，我指了指玻璃隔断那边直播间里的主持人，挥了下手，里面的主持人回了个笑脸后，男子即不再理我，而继续拨打着电话，我拉了张凳子坐在他的旁边，看着和他忙碌，间断里他会骂骂咧咧，因为个别电话拨通了，对方不愿意。

In the summer of 1998, over two frantic weeks in July, I wrote an essay titled The Future of Online Learning .(Downes, 1998) At the time, I was working as a distance education and new media design specialist at Assiniboine Community College, and I wrote the essay to defend the work I was doing at the time.

在西元一九九八年夏天，七月的两个疯狂的星期里，我写下了一篇文章《在线学习的未来》（唐棣芬，1998）当时，我从事远程教育工作，是一名阿西尼博因社区大学的新媒体设计专家，我写这篇文章是为了捍卫我当时的工作。

But Zai at the same time, you puts Xing at leaving this kind, at the same time Web2.0 company also is broken went inside the most high grade sale resource. Web2.0 enterprise made many flow, because of Ta inside the look is user generation, with Ta the look inside the most valuable this part resource, be a dropt instead.

但在同时，由于这种开放性，同时web2.0公司也失去了里面最优质的营销资源。web2.0企业做了大量的流量，因为它的内容都是用户产生的，所以它把最有价值的这部分资源内容，反而是开放掉了。

Material and MethodsRA Rabbit Model group: 15 early RA rabbits of the same weight and variety Control group:10 normal rabbits of the same weight and varietyMethods of making RA rabbit model:elect 15 normal rabbits of the same weight and variety, dissolve Ovalbumin in 0.9% sodium chloride solution, to make the solution of 20mg/ml concengtration, blend the same quantity of complete Freund′s Adjuvant equably ,inject the mixed solution into endermic tissue of the rabbit′s scapular section, making the rabbits allergic, inject 1 ml of the mixed solution to one rabbit every time, inject 1 ml of the mixed solution in 5 different places of the rabbit′s scapular section, inject the rabbit one time every week,inject 3 weeks continuously,it turned out to be that the rabbits will be allergic, inject Ovalbumin blent with the 0.9% sodium chloride solution into the knee joint cavity of the rabbits in the fourth week, 5 mg Ovalbumin every knee joint cavity,two knees of every rabbit of the 15 rabbits are both injected,the arthrosis diameter and the exterior temperature of the knees will be added obviously in 24 hours,and they will drop gradually,at the time of the 14th or 21th day, the arthrosis diameter and the exterior temperature of the knees will get to the balance time,the incidence rate of RA is 100%.after the RA model succeeds,it is the early time of RA from the first week to the fourth week,after the fourth week,it is the late time of RA, the cartilage of the femoral condyle and the subchondral bone cortices will be changed unrecoverily.

资料与方法RA模型组：早期RA家兔模型15只，品种及体重接近。对照组：正常家兔10只，品种及体重接近。RA家兔模型制作方法：选取15只成年家兔，体重、品种接近，将卵蛋白溶解于生理盐水，配成浓度为20mg/ml的溶液，与等量完全弗氏佐剂混匀，注入家兔肩胛区皮下致敏，每只家兔每次注射1ml，于肩胛区5个不同区域注射，每周一次，连续注射3周而致敏，第4周向膝关节腔注射卵蛋白生理盐水溶液，每只关节腔注射5mg卵蛋白，15只家兔膝关节全部注射，24h内此关节直径和表面温度大幅度上升，以后缓慢下降，至14～21d达到平台期，发病率达100%。造模成功后第1～4周为早期改变，第4周以后出现不可逆的关节软骨及骨破坏。采用高频超声对RA模型组与对照组的膝关节髌上囊液体厚度、滑膜及股骨髁软骨厚度及软骨下骨皮质的回声情况进行对比观察。结果RA组模型组膝关节髌上囊积液及滑膜的厚度明显厚于对照组，其股骨髁软骨的厚度与对照组相比无明显差异，其软骨下骨皮质与对照组相比无明显改变。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。