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So it is urgent to find a method todetect underground pipeline and its branches conveniently. In order to solve the above problem, based on the fact that the heated petroleumradiates heat to the soil and then the especial temperature distribution will be formedon the ground, this paper reach out a method creatively using the infrared imaging todetect the underground pipeline.

本文的研究内容正是从这一实际需求出发,根据石油在管道中传输时因加热而向周围土壤辐射红外能量,进而在管道上方地表形成特殊的温场分布的特点,创造性地提出了用红外热成像技术来检测埋地输油管道方法,并重点完成了几下几方面工作。

Considering the technical requirements,the stability andthe steady performance,the quantitative requirement for sampling frequency is present indiscrete control system.Considering that there is a step delay in discrete control in grid on inverter with a Lfilter,the quantitative relationship between critical FCCR and sampling frequency isanalyzed,and the steady performance is analyzed.Considering the technical requirements,the stability and the steady performance,the quantitative requirement for samplingfrequency is present in discrete control system with a step delay.

在L型并电加热管网中,考虑到离散化控制存在滞后一拍的问题时,本文分析并获得了离散PI控制系统稳定范围时闭环根临界频率fnmax和采样频率fs之间的定量关系;针对存在滞后一拍可能引起系统稳态特性下降的问题,分析了PI控制滞后一拍对频域特性造成的影响,综合考虑并网指标、稳定性要求和离散化对稳态特性影响三个主要因素,推导了存在滞后一拍的离散化PI控制对最低采样频率的量化要求。

The results showed that under 200 W power, in the present of various alkalis, e.g. Na2CO3, NaF, KF, NaHCO3, and DMF-H2O (V∶V=5∶3) used as solvent, PVC-TETA-Pd could catalyze sodium tetraphenylborate to react quantificationally with iodobenzene in 20 min without inert gas protection, and all the phenyl g...

实验发现:在微波功率为200W时,在Na2CO3,NaF,KF,NaHCO3等多种碱的存在下,以DMF的水溶液(V∶V=5∶3)为溶剂,在无惰性气体保护下,PVC-TETA-Pd催化四苯硼钠与碘代苯在20min内即可定量反应,与常规加热方式相比,节省了大量时间;同时也证明了四苯硼钠的四个苯基均可参与Suzuki偶联反应;该催化剂回收再利用3次后,仍具有较高的催化活性。

The determining method of nitrogen isotopic compositions for the granites collected from the northeastern part of China is studied.

通过对中国东北地区花岗岩类样品的分段加热,探讨了岩石中氮气同位素组成的测定方法,并测定了释放出的N含量及δN值。

The effects of four factors (concentration and the quantity of NaOH,temperature and heating time) on the protein recovery were studied on the base of the analysis of mycelium residue of itaconic acid fermentation.

研究了衣康酸工业化生产中所产生的土曲霉废菌丝体的主要组成成分,用碱液提取的方法进行了蛋白质的提取回收实验,考察了NaOH溶液浓度、用量、加热温度及时间对菌丝体脱蛋白效果的影响,结果表明衣康酸菌体脱蛋白的最优条件为:NaOH液浓度0。

In 1888, when he was working at Heidelberg under Quincke, Lenard had done his first work with cathode rays.

莱纳德很快对磷光和荧光现象发生了兴趣,这种在黑暗中发出的神秘的微弱亮光,从小就吸引了莱纳德,他曾和他的同学加热氟晶体让它发出荧光。

Resultantly, the individual warm/cold events in ENSO cycle appear to be partially locked to the annual cycle, and also exhibit obvious irregularity both in amplitude and in lasting time.

本文第四章研制设计了一包含海洋表面边界层和大气辐合反馈过程的热带太平洋海气耦合异常模式,进而利用该模式对ENSO循环进行了较为真实的模拟,通过对模式ENSO循环的演变特征及其形成机制的细致分析,建立了-ENSO循环的非线性分析模式,并提出了ENSO循环形成的一种更为客观的理论,指出:1)和观测事实类似,模式ENSO循环确实涉及了三种主要时间尺度过程即LF、QB和AC,其中LF为3-4年主周期振荡,QB占总方差10~20%;2)ENSO循环的正反馈机制是不稳定海气相互作用过程,且这一不稳定过程的发展在暖态中明显强于冷态;3)ENSO循环的负反馈机制在冷暖态中表现不同,在冷态消亡过程中,这种负反馈过程主要表现为西边界反射产生的时滞效应,但在暖态消亡过程中不存在类似的时滞效应,其负反馈过程主要表现为在海气耦合不稳定充分发展时伴随的赤道两侧冷水上翻过程的加强以及非线性过程的衰减作用抑制了不稳定的发展并最终使得系统回复至冷态;4)ENSO循环的3-4年主周期振荡是一非线性系统的自激振荡现象,其形成是线性系统的本征模即准两年振荡通过非线性机制产生的周期加倍所致,其中&单向性&大气辐合反馈加热过程对其形成至关重要;5)虽然年循环过程对ENSO循环形成没有本质影响,但它可明显影响ENSO循环的具体振幅和位相,使得ENSO对季节循环有明显的&锁相&特征,并且也使得ENSO循环在振幅大小和时间长短方面呈现出明显的不规则性。

A furnace equipped with a removable measuring scale in the side was applied to study on the shrinkage characteristics of semicoke/coke under gradient temperature during coking process.

利用炉侧安装了移动测量标尺的加热炉(φ150 mm×300 mm),分别以三种加热速率(1.0℃/m in、1.5℃/m in和3.0℃/m in)及两种堆密度(880 kg/m3和1 080 kg/m3)模拟工业炼焦,研究了1 500 g的炼焦用煤在焦化过程中径向收缩与焦化时间、中心温度、焦化升温速率及梯度温度的关系。

The phenomena of improved confinement has been observed with ECRH auxiliary heating under limiter discharge condition on the HL-2A tokamak, and electron line average density, plasma stored energy, radiated power within the separatrix, energy confinement time, H-alpha line emission etc, have been studied for the transition from L-mode to improved mode.

在HL-2A装置孔栏位形放电的等离子体实验中,电子回旋辅助加热期间观察到了等离子体约束改善的现象,并对等离子体从低约束模式向约束改善模式转换时的等离子体线平均电子密度、等离子体储能、分界面内辐射功率、能量约束时间、H辐射等进行了研究。

The hardened case ununiformity and quenching cracks of H32058 driven ring gear after the medium frequency induction quenching were analyzed.

分析了H32058从动齿圈经中频淬火后出现的淬硬层分布不均和淬火裂纹等缺陷的原因,通过重新设计感应器和反复工艺调试,利用两次中频加热淬火方式实现预热中频淬火,获得了沿齿廓分布的淬硬层。

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Do you know, i need you to come back

你知道吗,我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书,王祥生,李德昌。安徽省首次发现嗜群血蜱。

Chapter Three: Type classification of DE structure in Sino-Tibetan languages.

第三章汉藏语&的&字结构的类型划分。