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Elimination of LWD (Logging While Drilling) Tool modes Using Seismoelectric Data

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Communications in Computational Physics 2010年第1期7卷 47-63页

作者： Xin Zhan Zhenya Zhu Shihong Chi m.nafi tok.oz Earth Resources Laboratory Massachusetts Institute of TechnologyBuilding 54-181577 Massachusetts AveCambridgeMA 02142USA Petrophysics ConocoPhillips600 North Dairy AshfordHoustonTX 77252USA

Borehole acoustic logging-while-drilling (LWD) for formation evaluationhas become an indispensable part of hydrocarbon reservoir assessment [F. Citt ´a, C. Rus-sell, R. Deady and D. Hinz, The Leading Edge, 23 (2004), pp. 566-573]. However,the detection of acoustic formation arrivals over tool mode contamination has beena challenging problem in acoustic LWD technology. In this paper we propose a newmethod for separating tool waves from formation acoustic waves in acoustic *** method is to measure the seismoelectric signal excited by the LWD acoustic *** LWD tool waves which propagate along the rigid tool rim can not excite any elec-tric signal. This is due to the effectively grounding of the drill string during the LWDprocess makes it impossible to accumulate any excess charge at the conductive tool —borehole fluid interface. Therefore, there should be no contribution by the tool modesto the recorded seismoelectric signals. To theoretically understand the seismoelectricconversion in the LWD geometry, we calculate the synthetic waveforms for the multi-pole LWD seismoelectric signals based on Pride’s theory [S. R. Pride, Phys. Rev. B, 50(1994), pp. 15678-15696]. The synthetic waveforms for the electric field induced by theLWD-acoustic-wave along the borehole wall demonstrate the absence of the tool *** also designed the laboratory experiments to collect simulated LWD monopole anddipole acoustic and seismoelectric signals in a borehole in sandstone. By analyzing thespectrum of acoustic and electric signals, we can detect and filter out the differencebetween the two signals, which are the mainly tool modes and noise.

关键词： Logging While Drilling acoustoelectric logging multipole LWD seismoelectric sig-nal laboratory experiment numerical simulation

美国Cove Fort-Sulphurdale地热区地震震源机制和各向异性研究

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地震学报 2015年第6期37卷 899-915,1页

作者：张佩张海江刘影王华 m.nafi tok.oz 中国科学技术大学地球和空间科学学院中国合肥230026 中国科学技术大学地震与地球内部物理实验室中国合肥230026 麻省理工学院地球资源实验室美国剑桥02139

Cove Fort-Sulphurdale位于美国犹他州中西部,是一个地质特征独特的地热资源富集区.为了有效开发地热资源,有必要了解该地区的应力分布和裂缝分布.本文在前人工作的基础上使用地震资料,利用波形匹配、P波极性和横纵波振幅比联合约束反... 详细信息

Cove Fort-Sulphurdale位于美国犹他州中西部,是一个地质特征独特的地热资源富集区.为了有效开发地热资源,有必要了解该地区的应力分布和裂缝分布.本文在前人工作的基础上使用地震资料,利用波形匹配、P波极性和横纵波振幅比联合约束反演的方法,研究该地区地震的震源机制解;同时结合该地区的横波分裂分析研究,确定该地区的应力分布和断层/裂隙走向.波形反演结果显示,实际数据与模拟数据的波形匹配度非常高,且二者的P波初动极性和横纵波振幅比也都非常相近.由震源机制分析得出的断层面走向大部分趋于南北向,与美国区域应力图显示的最大水平主应力指向(南北方向),具有较好的一致性,符合目前研究对该地区的构造认知.横波分裂分析结果也表明如果各向异性主要是由该地区的断裂构造所引起,那么该地区的主要断层或裂缝的方向可能为南北向.

关键词： Cove Fort-Sulphurdale 震源机制波形匹配区域地震横纵波振幅比地热横波分裂各向异性

Vegetative Compatibility and Virulence Diversity of Verticillium dahliae from Okra (Abelmoschus esculentus) Plantations in Turkey and Evaluation of Okra Landraces for Resistance to V. dahliae

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Phyton-International Journal of Experimental Botany 2020年第2期89卷 303-314页

作者： Fatih m.tok.Sibel Dervis Halit Yetisir Hatay mustafa Kemal University Department of Plant ProtectionFaculty of AgricultureAntakyaHatay31034Turkey mardin Artuklu University Vocational School of KızıltepeDepartment of Plant and Animal ProductionMardin47000Turkey Erciyes University Department of HorticultureFaculty of AgricultureKayseri38225Turkey

Forty-four *** isolates were collected from symptomatic vascular tissues of okra plants each from a different field in eight provinces located in the eastern mediterranean and western Anatolia regions of Turkey during ***-nonutilizing(nit)mutants of *** from okra were used to determine heterokaryosis and genetic relatedness among *** isolates from okra plants were grouped into two vegetative compatibility groups(VCGs)(1 and 2)and three subgroups as 1A(13.6%,6/44),2A(20.5%,9/44)and 2B(65.9%,29/44)according to international *** tests were performed on a susceptible local okra(***)landrace in greenhouse *** isolates from VCG1A and VCG2B induced defoliation(D)and partial defoliation(PD)symptoms,*** isolates from VCG2A gave rise to typical leaf chlorosis symptoms without *** obtained data showed that the virulence level of *** isolates from okra was related to their VCG *** okra landraces from diverse geographical origins were screened for resistance to VCG2B and VCG1A of *** results indicated that all landraces were more susceptible to highly virulent VCG1A-D pathotype displaying D or PD symptoms depending on their susceptibility levels with a mean disease severity index of 3.52 than to less virulent VCG2B-PD pathotype of *** displaying PD and ND symptoms with a mean disease severity index of *** differences were observed among the landraces;however,none of them exhibited a level of *** landraces;Çorum,Hatay Has and Sanlıurfa displayed the lowest level of susceptibility or little tolerance to both D and PD ***2B of PD was prevailing in the surveyed areas and VCG1A of D was the most virulent of the VCGs *** of resistant genotypes to Turkish okra germplasm from different sources and breeding new resistant okra cultivars are critical for the sustainability of okra production.

关键词： Landraces malvaceae nit mutants pathotypes VCGs defoliating wilt

Petrographic of Northwestern Sudan

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Journal of China University of Geosciences 2003年第2期14卷 137-143页

作者： nafi Abdullatif O m m Faculty of Earth Resources China University of Geosciences Wuhan 430074 Department of Geology Faculty of Science University of Khartoum Sudan

The sedimentology of the Northwestern Sudan consists of lower, middle and upper cycles. The lower and upper cycles are composed of intercalated fluvial and shallow marine facies, whereas the middle cycle consists entirely of fluvial and glaciofluvial facies. The petrographic analysis shows that the lower and upper cycles consist of quartz and lithic arenite sandstones, whereas the middle cycle consists of arkosic and lithic arenite sandstones. The lower and upper cycle sandstones reflect derivation mainly from recycled orogens with minor contribution from craton interior provenances. However, the middle cycle sandstones indicate derivation from basement uplift, transitional and mainly recycled orogens provenances.

关键词： glaciofluvial recycled orogen marine facies.

Transfer of single dose of intravitreal injection of ranibizumab and bevacizumab into milk of sheep

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International Journal of Ophthalmology(English edition) 2017年第7期10卷 1069-1075页

作者： Tugba Cakmak Argun ozlem Yalcin tok.Levent tok.Gulsen Yilmaz Fatma meric Yilmaz Alime Gunes mehmet Argun Osman Butuner Department of Ophthalmology Hatay Dortyol State Hospital Faculty of medicine Ophthalmology Suleyman Demirel University ministry of Health Ankara HospitalBiochemistry Biochemistry Department Faculty of MedicineYildirim Beyazit University The management of Veterinary Service

AIm： To investigate whether single-dose intravitreal injections of bevacizumab and ranibizumab transfer into milk. mETHODS： This study included lactating 12 sheep and a single 3-month old suckling lamb of each sheep. Two groups consisting of 6 sheep and their lambs were constituted; the ranibizumab group and the bevacizumab group before the administration of intravitreal injections, blood and milk samples were obtained from all sheep and, following the injections, blood and milk samples of all sheep and blood samples of all lambs were collected at regular time points. Serum and milk concentrations of bevacizumab and ranibizumab were measured using an enzyme-linked immunosorbent assay（ELISA） kit. The limit of determination was 0.9 ng/m L for bevacizumab and 0.62 ng/m L for ***： At 6h after intravitreal injections, bevacizumab concentration was above the limit of determination in the blood of all sheep. At 3wk, when the study was terminated, bevacizumab concentrations were high in 4 sheep. Even though bevacizumab concentrations in milk showed fluctuations, the drug transferred into the milk of all sheep at detectable concentrations. Ranibizumab drug concentrations in the blood and milk of sheep and those in the blood of lambs were below the limit of determination by the ELISA ***： This sheep model study demonstrate that intravitreal injection of ranibizumab, which did not transfer into the milk of sheep and suckling lambs, is safer than bevacizumab during lactation period.

关键词： bevacizumab ranibizumab lactation milk vascular endothelial growth factor

Crustal structure of the central Tibetan plateau and geological interpretation

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Earthquake Science 2012年第5期25卷 363-370页

作者： Can Ge Youshun Sun m.nafi tok.z Yingcai Zheng Yong Zheng Xiong Xiong Diming Yu State Key Laboratory of Geodesy and Earth Geodynamics Institute of Geodesy and GeophysicsChinese Academy of Sciences University of Chinese Academy of Sciences Department of Earth Atmosphere and Planetary SciencesMassachusetts Institute of Technology

Based on teleseismic data obtained from 225 stations from two networks in the central Tibetan plateau, we have generated detailed crustal structure images using P-wave receiver function techniques with more accurate piercing-depth-correction and time-depth-correction than what have previously been available. Our images indicate an undulatory moho beneath the Tibetan plateau with a steep jump beneath the northern Himalaya, and obviously different structures in proximity to the Bangong-Nujiang suture. In several sections of the Tibetan plateau, the lower crust is characterized by pervasive high-velocity regions, which are consistent with the preservation of eclogite bodies beneath the plateau, whose presence affects the dynamics of the Tibetan plateau.

关键词： receiver function crustal structure Tibetan plateau

Depth determination of the moho interface beneath the Tibetan plateau and other areas of China

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Earthquake Science 2012年第5期25卷 415-431页

作者： Youshun Sun Diming Yu m.nafi tok.z F Dale morgan Xiyu Wang Jinrong Su Jun Liu State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and GeophysicsChinese Academy of Sciences Department of Earth Atmospheric and Planetary SciencesMassachusetts Institute of Technology Earthquake Administration of Sichuan Province School of Civil Engineering and Architecture Wuhan University of Technology

We apply the adaptive moving window method of Sun et al. to the most recent catalog data and the data recorded by portable stations to construct the velocity structure of the crust and upper mantle, and to determine the depth of the moho interface beneath the Tibetan plateau and other areas of China. We first select 2 600 locations in the study region with 1° intervals, then at each location invert for a five-layer 1-D P-wave velocity model from the surface down to the uppermost mantle by performing a monte Carlo random search. The moho depth at each location is then determined, and the moho interface beneath the study region is obtained through proper interpolation with certain smoothing. Compared to depths obtained by previous studies, our results show more accurate moho depths in the Tibetan plateau, Tianshan region and other areas of the study region.

关键词： moho depth moho interface Tibetan plateau

modernization, Globalization and Europeanization in the Cities of Anatolia, Turkey in Post 1980s

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International Relations and Diplomacy 2016年第10期4卷 617-629页

作者： m. Evren tok Hamad Bin Khalifa University Doha Qatar

This study will portray the socio-economic and cultural bases of the alternative modernity claims of three Anatolian cities： Kayseri, Gaziantep and Eskisehir. The intention is to build a picture of the local socio-economic and cultural capacities of these cities and compare them. This comparative analysis will also involve a temporal dimension in the differentiation between the pre-1980s and post-1980s periods. It is hoped that this will offer a better perspective on the different starting points of the cities that resulted from historical levels of state involvement, which in turn produced variation in the formation of industrial and manufacturing capacities. Various practices of market based policies, which influenced the socio-economic conditions in these cities, will be presented to help us conceive of the differential impacts of these policies. Similarly, by looking at export capacities and labor market indicators in each city, we will have a more complete picture of the basis for claims of success. Two external processes, globalization and Europeanization and the changes and transformations they elicited, will also be discussed as additional and significant components in these cities＇ claims to success.

关键词： local economic development Anatolian tigers Turkey globalization Europeanization

犹他州Cove Fort-Sulphurdale地区微地震震源机制研究与应用

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犹他州Cove Fort-Sulphurdale地区微地震震源机制研究与应用