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A new deep-reading look-ahead method in electromagnetic loggingwhile-drilling using the scattered electric field from magnetic dipole antennas

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Petroleum Science 2022年第1期19卷 180-188页

作者： Lei Wang Shao-Gui Deng guan-Bao xie Shan-jun Li Zhen-guan Wu Yi-Ren Fan School of Geosciences China University of Petroleum(East China)QingdaoShandong 266580China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdaoShandong 266071China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing100083China Beyond Bits Technoogy Inc.Houston78741USA

This paper presents a new deep-reading logging-while-drilling electromagnetic(EM)logging method to detect bed boundaries ahead of *** all existing EM logging approaches,the new method is based on the scattered electric field radiated by a magnetic dipole *** analyzing the characteristics of electric tensor responses in layered formations,optimal look-ahead electric component is *** selected scattered field contributes to a large portion of the total field and is strongly sensitive to the boundary *** measured voltage from the scattered electric component can be tens of times larger than that from the scattered magnetic fields and it attenuates ***,the detection capability improves significantly.A coaxial open-loop half-circle antenna is then proposed to measure the electric field in logging while drilling environment.A practical tool implementation equipped with two tilted close-loop antennas and two open-loop antennas is further developed for look-ahead *** results demonstrate that the detection depth of the new look-ahead tool can be up to 40 m under favorable *** with current look-ahead logging tools,the new method not only significantly shortens the tool size,but also can recognize the boundary position and azimuth.

关键词： Electromagnetic logging-while-drilling look-ahead Deep reading Scattered electric field Short spacing

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Adaptive sampling strategy for characterizing spatial distribution of soil liquefaction potential using cone penetration test

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journal of Rock Mechanics and Geotechnical Engineering 2022年第4期14卷 1221-1231页

作者： Zheng guan Yu Wang Tengyuan Zhao Department of Architecture and Civil Engineering City University of Hong KongTat Chee AvenueKowloonHong KongChina School of Human Settlements and Civil Engineering Xi’an Jiaotong UniversityXi’an710049China

Characterizing spatial distribution of soil liquefaction potential is critical for assessing liquefactionrelated hazards(*** damages caused by liquefaction-induced differential settlement).However,in engineering practice,soil liquefaction potential is usually measured at limited locations in a specific site using in situ tests,*** penetration tests(CPTs),due to the restrictions of time,cost and access to subsurface *** these cases,liquefaction potential of soil at untested locations requires to be interpreted from limited measured data points using proper interpolation method,leading to remarkable statistical uncertainty in liquefaction *** underlines an important question of how to optimize the locations of CPT soundings and determine the minimum number of CPTs for achieving a target reliability level of liquefaction *** tackle this issue,this study proposes a smart sampling strategy for determining the minimum number of CPTs and their optimal locations in a selfadaptive and data-driven *** proposed sampling strategy leverages on information entropy and Bayesian compressive sampling(BCS).Both simulated and real CPT data are used to demonstrate the proposed *** examples indicate that the proposed method can adaptively and sequentially select the required number and optimal locations of CPTs.

关键词： Liquefaction potential Information entropy Cone penetration test(CPT) Site characterization Compressive sampling

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Ecological footprint of Shandong,China

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journal of Environmental Sciences 2004年第1期16卷 167-172页

作者： CUIYu-jing LucHens ZHUYong-guan ZHAOjing-zhu ResearchCenterforEco-EnvironmentalSciences ChineseAcademyofSciencesBeijing100085China HumanEcologyDepartment FreeUniversityofBrusselsBelgium

Ecological footprint has been given much attention and widely praised as an effective heuristic and pedagogic device for presenting current total human resource use in a way that communicates easily to almost everyone since 1996 when Wackernagel and Rees proposed it as a sustainable development indicator. Ecological footprint has been improving on its calculation and still can be a benchmark to measure sustainable development although there are still ongoing debates about specific methods for calculating the ecological footprint. This paper calculates the ecological footprint of Shandong Province, China with the methodology developed by Wackernagel and analyzes the current situation of sustainable development in Shandong.

关键词： ecological footprint carrying capacity sustainable development Shandong

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Ligand Engineering in Metal Nanoclusters: from Structural Control to Functional Modulation

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Chinese journal of Structural Chemistry 2020年第7期39卷 1194-1200页

作者： guan Zong-jie WANG Quan-Ming Department of Chemistry Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of EducationTsinghua UniversityBeijing 100084China

Ligand-protected metal nanoclusters have drawn increasing research interest because of their unique physicochemical properties and practical *** efforts have been made in pursuing rational synthesis of metal nanoclusters and establishing the structure-property *** an indispensable part of ligand-protected metal nanoclusters,ligands play multiple roles in determining their structures and *** this perspective,we demonstrate the importance of ligand engineering in terms of the control of structures,optical and catalytic properties of metal ***,we will show that ligand engineering is prospective in structural design and preorganization of surface metal sites.

关键词： metal nanoclusters physicochemical properties structure-property relationship ligand engineering

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W-band millimeter wave vialess microstrip-to-microstrip vertical transition in multilayer LCP substrate

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The journal of China Universities of Posts and Telecommunications 2024年第3期31卷 87-94页

作者： Liu Weihong Zhang xu guan Dongyang School of Electronic Engineering Xian University of Posts and TelecommunicationsXi'an 710121China

In this paper,a W-band broadband vialess microstrip(MS)-to-MS vertical transition in multilayer liquid crystal polymer(LCP)substrate is presented,which consists of two MS lines in the top layer,a common ground plane and slotline resonators in the second layer,and a close-loop transmission-line in the third *** increase the passband of the vialess vertical transition,an H-shaped slotline resonator is introduced,which greatly improves the impedance performance of the slotline resonator,and the full-wave simulated results indicate that insertion loss(IL)is less than 2 dB and return loss(RL)is better than 10 dB at *** verify this design,the broadband vertical transition is fabricated and *** measured results indicate that a broadband vertical transition with RL better than 10 dB and IL less than 5.67 dB can be obtained in the frequency range from 70.00 GHz to 104.09 *** to the fabrication error in the preparation process,the measured results are deteriorated compared to the simulated results,and the investigation indicates that the deviation is caused by the thickness error of the LCP substrate.

关键词： W-band broadband microstrip(MS)-to-MS vialess vertical transition liquid crystal polymer(LCP)

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Analytically Derived Wind Wave Growth Relations

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China Ocean Engineering 2002年第3期17卷 359-368页

作者： guan Changlong(管长龙) SUN Qun(孙群) Physical Oceanography Laboratory and Institute of Physical Oceanography Ocean University of Qingdao Qingdao 266003 China Physical Oceanography Laboratory and Institute of Physical Oceanography Ocean University of Qingdao Qingdao 266003 China

By the use of the 3/2 power law presented by Toba combined with the significant wave energy balance equation for wind wave, wind wave growth at a limited fetch is analytically investigated. The new wind wave growth relations (WWGRs) are analytically derived with sheltering coefficient and wind drag coefficient as parameters. The geometrical average of observational values of sheltering coefficient and the arithmetic average of observational values of wind drag coefficient are applied to determine the new WWGRs. Comparisons with existing empirical WWGRs are made.

关键词： wind wave wind wave growth relation 3/2 power law

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Establishment of Core Collection and Analysis of Genetic Diversity for Both Hunan and Hubei Soybean Germplasm Resources

Establishment of Core Collection and Analysis of Genetic Div...

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2003年全国作物遗传育种学术研讨会

作者： Y.guan R.x.guan L.j.Qiu R.Z.Chang Key lab of crop germplasm and Biotechnology

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Achieving privacy-preserving big data aggregation with fault tolerance in smart grid

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Digital Communications and Networks 2017年第4期3卷 242-249页

作者： Zhitao guan guanlin Si School of Control and Computer Engineerir~ North China Electric Power University Belting 102206 China

In a smart grid, a huge amount of data is collected for various applications, such as load monitoring and demand response. These data are used for analyzing the power state and formulating the optimal dispatching strategy. However, these big energy data in terms of volume, velocity and variety raise concern over consumers＇ privacy. For instance, in order to optimize energy utilization and support demand response, numerous smart meters are installed at a consumer＇s home to collect energy consumption data at a fine granularity, but these fine-grained data may contain information on the appliances and thus the consumer＇s behaviors at home. In this paper, we propose a privacy-preserving data aggregation scheme based on secret sharing with fault tolerance in a smart grid, which ensures that the control center obtains the integrated data without compromising privacy. Meanwhile, we also consider fault tolerance and resistance to differential attack during the data aggregation. Finally, we perform a security analysis and performance evaluation of our scheme in comparison with the other similar schemes. The analysis shows that our scheme can meet the security requirement, and it also shows better performance than other popular methods.

关键词： Big data Smart grid Privacy-preserving Fault tolerance

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Analysis of Vibrational Performance of A Piezoelectric Micropump with Diffuse/Nozzle Microchannel

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Nanotechnology and Precision Engineering 2018年第2期1卷 138-144页

作者： Yanfang guan xiang Li School of Mechanical and Electrical Engineering Henan University of TechnologyZhengzhou 450001China

Piezoelectric transducers of different external diameters are designed and fabricated and incorporated into micropumps. Through finite element analysis, it is shown that the volume efficiency of the micropump reaches its maximum value for the first mode of vibration. The variation of maximum displacement with frequency is determined under free and forced vibration. Results demonstrate that this variation shows the same trend for different driving waves at the same driving voltage. The maximum displacement under forced vibration is less than that under free vibration. The displacement increases with decreasing distance from the center of the transducer. The maximum displacement is inversely proportional to the diameter of the transducer and proportional to the driving voltage under both free and forced vibrations. Finally, the micropump flow rate and pressure are measured and are found to manifest the same trend as the maximum displacement under the same driving conditions. For a piezoelectric transducer of 12 mm external diameter, the maximum flow rate and pressure value are 150 μL/min and 346 Pa, respectively, under sine-wave driving at 100 Vpp driving voltage.

关键词： Micropump Vibrational displacement Piezoelectric transducer Microflow

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A method of predicting visual detectability of low-velocity impact damage in composite structures based on logistic regression model

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Chinese journal of Aeronautics 2021年第1期34卷 296-308页

作者： Fengyang jIANG Zhidong guan Zengshan LI xiaodong WANG School of Aeronautic Science and Engineering Beihang UniversityBeijing 100083China

This paper proposed a new method for quantitative assessment of visual detectability of damage based on logistic regression,using the Probability of Detection(POD)as a *** were performed to establish the massive hit/miss data of visual *** investigations verified the reliability of the *** prediction function concluded comprises more than one flaw size parameters,including the depth and diameter of the *** results show that the depth and diameter of the dents are pivotal for the evaluation of detectability;the type of detection,the detection distance,and the qualifications of personnel are critical external factors to be *** function,with an accuracy rate of nearly 85%,is capable of predicting the visual detection probability of impact damage under various detection environments,which will provide a reference for the damage tolerance design of composite materials and field maintenance in the NonDestructive Testing(NDT)field.

关键词： Composite materials Damage tolerance Machine learning NDT Logistic regression

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