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Examples are industrial discharge such as brine, living sewage disposal, cooling water of power plant which is discharged to the river, dust or waste hot gas which is let to the atmosphere from chimney and cooling tower, and bilge water which is released to the port water area.

当废水或废气排放到环境流体中时,废流体的密度往往与环境流体的密度不同,这种由于密度差而产生的浮力不仅影响平均流本身,而且更主要的影响湍流及受湍流影响的动量、热量和质量的交换。

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。

Under the condition of the borehole and sandstone formation filling with oil and water, respectively, the ability is different when different energy windows are selected to distinguish formation by simulating the detector response spectrum of various diameters and length of NaI and BGO crystal. The C/O value difference of BGO crystal is higher than that of NaI crystal when the energy window includes photoelectric peak, the first and the second escape peaks, but it is less affected by the different sizes of detector crystal. Using photoelectric peak corresponding to the energy window, the C/O value difference of BGO crystal detector is much larger than that of NaI, but it increases with the crystal size increasing. The C/O value is greatly affected by energy drifting, while relatively a little by energy resolution.

对于井眼和地层流体分别为油和水砂岩地层,模拟改变NaI和BGO晶体探测器的直径和长度时的非弹性散射γ射线响应能谱,采用不同能窗处理方法对地层流体的分辨能力不同,选取光电峰和第一、第二逃逸峰对应的能量窗时,BGO晶体探测器比NaI晶体探测器测量的C/O差值大,但受尺寸的影响不大;采用光电峰对应的能量窗时,BGO晶体探测器测量的C/O差值比NaI的大得多,且随尺寸的增加差值增大;能量道的漂移对C/O值影响较大,而能量分辨率对差值影响相对较小。

It will take 56 to 63 days for the frist generetion of Asiatic corn borer to develop from egg to larva, pupa, and imago in Dewu region. 7. The primary imperilment period of first gemeration of Asiatic corn borer is shooting stage. And the heading stage, grain filling stage in early sowing corn and belling stage in late sowing cron is disserved by the second generation. The imperilment degree of second generation is more serious than frist generation. 8. The best way for the prevention of black cutworm is to spray on early larva and to trap and kill with poison bait in late larva.

7第一代玉米螟主要为害拔节期玉米,第二代玉米螟主要为害处于抽雄吐丝期、灌浆期的早播玉米和处于大喇叭口期的晚播玉米,第二代玉米螟对玉米的为害程度显著高于一代玉米螟;玉米螟的为害受玉米品种影响较大,自交系苏宁三号的受害程度明显高于其他各品种;植株长势对玉米螟发生为害程度有极显著影响,表现为长势好、生长旺盛的玉米受害重,长势差的玉米受害轻;海拔高低对玉米螟发生为害的影响不大。

After that this article promulgates the root of differences between impoverished and non-impoverished students.

本文的主要结论如下:所研究的大学场域的资本分配结构是:学生学业资本的积累会受到其经济资本的影响,而不会受文化资本和权力资本的影响;学生社会资本的积累会受到其文化资本和权力资本的影响,而不会受到经济资本的影响;贫困大学生的学业资本普遍高于非贫困大学生,而其社会资本普遍低于非贫困大学生;两类学生群体所拥有的资本总量和结构的不同,导致了他们生存心态和场内实践的差异。

The symbol color of Confucian ethic affects the color development of Chinese figure painting, esp. on the figure's dress. Buddhism has developed closely with the magnificent style of "Royal academic painting" in Sui and Tang Dynasties. While in Song and Yuan Dynasties, literati painting type that focus on adding washes of ink or color to a drawing affected by Taoist ideas holds the mainstream of the position in painting ciders and all lasts to modem times.

儒家的伦理象征色影响了中国人物的色彩发挥(主要是对人物服饰的影响),佛教与隋唐之际金碧辉煌的&院画&风格的形成有关系;到了宋元,受道家思想影响的水墨渲淡为主的文人画风占据了画坛的主流地位,并一直影响到近现代。

The result indicates the following:(1) for consumers, different endorsers' personal images are significantly different;(2) the effects of endorsers on brand personality of cell phones are significant; and (3) dimensions of the endorsers' personal image have effects on dimensions of brand personality, including positive and negative effects.

研究结果发现:一、不同的广告代言人的性格形象,在消费者心目中有显著差异;二、代言人对於手机品牌性格的各构面有显著影响;三、品牌性格的各构面受广告代言人性格形象的各构面影响甚深,有些是正向影响,有些则是负向的影响。

Besides being affected by ferromagnetic basic carrier liquid viscosity and magnetic solid granule in ferromagnetic liquid, ferromagnetic fluid viscosity is primarily concerned with additive magnetic field intensity and temperature.

分析了影响磁流体粘度的因素并导出了其可控参数与磁流体粘度系数间的函数关系;说明磁流体粘度除了受磁流体基载液粘度和磁性固相纳米颗粒的影响外,还与附加外磁场强度和温度有关,其中外磁场强度 H的影响要大于温度 T的影响,并指出了三种可能的控制外磁场强度的方

There is si加f cant relationship between Internet use and personality traits, the personality is a decisive factor on adolescent's Internet use;4 There are also some factors, including Internet use attitude, Internet use motivation, user's social support, self-consistency and congruence, self}steem and loneliness, which have an important impact on adolescent's Internet use;5 The pathological Internet use, which is influenced by the user's personality traits, is also affected by other factors mentioned above.

3青少年互联网使用与人格特征之间存在密切的关系,人格是影响青少年互联网使用的重要决定因素;4互联网使用动机、互联网态度、使用者的社会支持、自我和谐、自尊、孤独等因素也是影响青少年互联网使用的重要因素,它们通过复杂的柑互影响对互联网使用行为起作用;5青少年病理性互联网使用受使用者人格因素的影响,也与其他因素之间关系密切。

The effects of gas-liquid ratio, oil saturation and permeability on nitrogen foam flow law in porous media were studied systemly. Oil saturation is the main influential factor of foam's fluidity, and just for this, the aggravation of formation heterogeneity has little effect on the effect of the profile control, foam's flow law is decided by remaining oil distribution.

系统研究了气液比、含油饱和度、渗透率对氮气泡沫渗流规律的影响,结果表明,含油饱和度是影响氮气泡沫渗流阻力的最主要因素,泡沫渗流阻力随着含油饱和度的升高而降低,剩余油分布规律决定了调驱过程中氮气泡沫的渗流规律,受此影响,地层非均质性的增加对泡沫调剖效果的影响较小。

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推荐网络例句

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车,和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特,那个是爱朗。

Articulate the aims, objectives and key aspects of a strategic business plan.

明确的宗旨,目标和重点战略业务计划。