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Analytical solution of electromagnetic field generated by induction logging tool in a fan-ring slot of drill collar while drilling

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Science China(Technological Sciences) 2009年第7期52卷 2128-2137页

作者： LIU FuPing WANG AnLing YANG ChangChun Beijing Institute of Graphic Communication Beijing 102600China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China

Based on the structural characteristic of metal drill collar for induction logging while drilling, we have given the analytical formulae of lengthways fields Ez and Hz when the tool is located in a fan-ring shaped slot of drill collar by the boundary conditions of electromagnetic field, and derived the other components of electromagnetic field in and out the fan-ring slot from Ez and Hz. In the other intervals of formation, where the drill collar is a solid cylinder, the analytical formulae of field are educed through the method of variable coefficient. The total analytical solutions of field in whole space have been obtained. With the help of the analytical formulae, we have also given numerical examples and analyzed the distributive characteristic of electromagnetic field. From the computational results we find that the secondary scattering field Hz is in a linear relation with the conductivity of stratum. The characteristic of field is very useful for induction logging while drilling, which can be used to measure and analyze the logging responses of the stratum conductivity. This paper sets up a theoretical foundation for us to study the distrbutions of field and to direct the design of logging instruments.

关键词： drill collar logging while drilling induction logging while drilling fan-ring shaped slot

Predictors and Risk Perceptions of Using Cell Phones while Driving among Young Adult Drivers

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Journal of Traffic and Transportation Engineering 2019年第2期7卷 71-84页

作者： Scarlett Mia S.Tabunar Department of Emergency Medicine University of the Philippines-Philippine General HospitalUP-College of MedicineManila 1000Philippines

The Philippines is expecting a rise in the number of drivers that use mobile phones while *** is known as the“texting capital of the world”.The objectives of this study were to determine the predictors,risk perceptions and the prevalence of cell phone use while driving among trainee residents of the University of the Philippines-Philippine General *** cross-sectional study employed total enumeration.A survey was first distributed to the target population,followed by a focus group ***-square and multiple logistic regression were used to analyze *** in the final analysis were 175 drivers aged 25-30 years(mean=27.90+1.34).There was no significant difference in the risk perceptions of cell phone users ***-users,and most perceived hands-free devices safer to use(p=0.030).The reported prevalence is 90.68%;drivers have a significant overall unsafe attitude(p=0.007),and an unsafe attitude when using handsets when driving,even when this is known to be dangerous(p=0.003).In conclusion,driving with hands-free devices was perceived to be safer,although drivers have a high overall unsafe *** for more than two years and having an unsafe attitude were found to be significant predictors of cell phone use while *** must take into account these factors when instituting behavioral modification strategies and road safety policies concerning unsafe and distracted driving.

关键词： Attitude cell phone use while driving driving experience distracted driving risk perceptions young adult drivers

Mature while Growing up, Innovative while Inheriting——Exclusive Interview with Zhao Xinli, the Associate Dean of the Advertising School of Communication University of China

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China's Foreign Trade 2019年第3期 24-27页

作者： Liu Xinwei 不详

As the Chinese proverb goes,a man of his thirties should be *** a person,it s time to shoulder the responsibility he or she longs *** a major and a School,it s time to root deep,to take responsibility and to fulfill its dream of 'a School stands for a hundred years as a tree for a thousand years'.As the Advertising School of Communication University of China embraces its 30th 'birthday',Zhao Xinli,the Associate Dean of the School,was exclusively interviewed by China’s Foreign Trade.

关键词： the Associate Dean of the Advertising School of Communication University of China China Innovative while Inheriting Mature while Growing up Exclusive Interview with Zhao Xinli

THE HAIF-SPACE RESPONSE ANALYSIS OF DUAL-INDUCTION LOGGING while DRILLING BASED ON COMSOL

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国外测井技术 2014年第5期34卷 3-4页

The response characteristics of the dual-induction logging tool while drilling in a half-spaceare computed and analyzed when the instrument slots opening direction, instrument height, ground conductivity is changed respectively. The results show that the haJ^-space response of the different opening direction of instrument slots has a nonlinear change with the increase of the ground conductivity. The effect of half-space response on the instrument slots downward opening direction is greatest and the upward is minimal The half-space response of the deep induction reaches the maximum near the 0.4m height when tool is above ground. The peak position does not change with the ground conductivity *** results have a practical significance to determine accurately the sonde error of the dual-induction logging tool while drilling.

关键词： dual-induction logging while drilling half-space response sonde error COMSOL finite-element software

Reinforcing the Results After poverty alleviation,rural areas focus on new development goals while consolidating previous outcomes

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ChinAfrica 2021年第12期13卷 24-25页

作者： Lu Yan 不详

Shi Liping is famous for her clever *** her mother and grandmother,the 55-year-old inherited the skills of Miao embroidery,the traditional art of the Miao ethnic group known for its rich colors and delicate designs,an... 详细信息

关键词： mother while listed

TRANSFORMING LIVES New homes spell a new life for villagers while retaining traditional culture

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Beijing Review 2020年第39期63卷 20-21页

作者： Xia Yuanyuan 不详

Anyone who visits the new home of Jize Munai is greeted with a welcoming ritual. Once comfortably seated, the guest is shown a large photo of his old house that hangs proudly on a wall. Jize, 48, believes this photo t... 详细信息

关键词： while has culture

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例析while从句的多种含义

中小学英语教学与研究 2019年第10期 80-80,F0003页

作者：陈涛上海电机学院

***表示时间表示时间时,while意为“在……期间、当…的时候、与……同时”。1)表示现在We must strike while the iron is hot.我们必须趁热打铁。while you are young,you’d better study hard.趁着年轻,你最好努力学习。2)表示过去W... 详细信息

***表示时间表示时间时,while意为“在……期间、当…的时候、与……同时”。1)表示现在We must strike while the iron is hot.我们必须趁热打铁。while you are young,you’d better study hard.趁着年轻,你最好努力学习。2)表示过去while I was in Madrid there was a carnival.我在马德里的时候正赶上狂欢节。

关键词： while 狂欢节马德里趁热打铁

in a while 与 for a while 辨析

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中小学英语教学与研究 2019年第2期 75-76页

作者：安淑红江苏省运河高等师范学校

现代英语中,while兼有连词、动词和名词词性。作为连词使用时,while主要有三种用法:一是引导时间状语从句,意为“当……的时候,和……同时”;二是可以引导让步状语从句,意为“虽然,尽管”;三是可以连接两个并列的句子,表示“而,却”,含... 详细信息

现代英语中,while兼有连词、动词和名词词性。作为连词使用时,while主要有三种用法:一是引导时间状语从句,意为“当……的时候,和……同时”;二是可以引导让步状语从句,意为“虽然,尽管”;三是可以连接两个并列的句子,表示“而,却”,含有相对或对比之意。while作为动词时仅用于while sth. away,表示“消磨(时间),闲混(时间)”,如while afew hours away(闲混几个小时)。

关键词： while for 时间状语从句让步状语从句现代英语连词动词引导

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while作让步状语连词的时间特征

西华师范大学学报（哲学社会科学版） 1990年第1期 99-107页

作者：王首川

一 1988年第6期《英语世界》,有一篇从国外报刊上选载的文章,记述了美国军舰“文森斯”号7月3日在海湾地区用导弹击落一架伊朗客机的详细经过及原因。其中有这么一句话: But while captain Rogers knew what had apparently been transm... 详细信息

一 1988年第6期《英语世界》,有一篇从国外报刊上选载的文章,记述了美国军舰“文森斯”号7月3日在海湾地区用导弹击落一架伊朗客机的详细经过及原因。其中有这么一句话: But while captain Rogers knew what had apparently been transmitted by the plane on coded military frequencies, he was not aware that the aircraft had been exchanging routine flight instructions with the civilian control tawer, broadcast on open radio channels.

关键词：英语世界状语从句时间特征语义学家 while apparently 从属连词 military broadcast aircraft