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Reservoir forming conditions and key exploration and development technologies for marine shale gas fields in Fuling area, South China

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Petroleum Research 2018年第3期3卷 197-209页

作者： zhigang wang China Petroleum&Chemical Corporation Beijing100728China

Although shale gas resources are abundant in China,commercial discoveries have not been made before the discovery of Fuling Shale Gas *** has done lots of theoretical and technological studies on marine shale gas development in *** shows shale gas has dynamic accumulations with early preservation and late reconstruction and proposes high-quality shale developed in deep-water shelf as the base and good preservation conditions as the key factor for shale gas *** technologies and facilities were developed for geophysical survey of shale gas,design and optimization of shale gas development,drilling and completion of horizontal wells,and fracturing *** the first and largest shale gas field in China,the discovery and successful development of Fuling Shale Gas Filed has made China the first country to achieve large-scale development of shale gas after North *** August 2017,Fuling Shale Gas Field had declared 6008.14×10^(8)m^(3) proven reserves,76.8×10^(8)m^(3) production capacity and 133.9×10^(8)m^(3) cumulative *** construction of Fuling Shale Gas Field with high level,high speed and high quality has been a good example of shale gas development in *** successful experiences can be used to other fields and play an important role in optimizing energy structure and improving environment.

关键词： Shale gas Exploration Well drilling and completion Staged fracturing Environmental protection Commercial development Fuling area

Comparative study of two lay-up sequence dispositions for flexible skin design of morphing leading edge

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Chinese Journal of Aeronautics 2021年第7期34卷 271-278页

作者： Yu YANG zhigang wang Shuaishuai LYU Aircraft Strength Research Institute Xi’an 710065China

Morphing leading edge has great potential for noise abatement and aerodynamic efficiency *** drooping effect is realized by bending of the flexible skin which encloses to form the leading *** the flexible skin is often made of composite laminates of Glass Fiber Reinforced Plastics(GFRP),the lay-up sequences have become the determinant,which affects not only the morphing quality but also the manufacturing *** optimizing methods of layup sequences are comparatively *** the first method,the laminal quantities in 0,±45and 90vary independently,while in the second one,the concept of isotropic laminate unit[0/45/45/90]s is employed and the unit quantity is the unique *** evaluation demonstrates that for both methods there is insignificant impact to the overall morphing quality;however,specific concern is equally necessary for these two methods to the tip of the leading edge where the skin is at its minimum thickness and bears the most severe bending *** terms of computational efficiency and post-processing labor,the second method has better performance.

关键词： Composite laminates Flexible skin Glass fiber reinforced plastics Lay-up sequence Leading edge Morphing wing

Applications of the Kinetic Formulation for Scalar Conservation Laws with a Zero-Flux Type Boundary Condition

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Chinese Annals of Mathematics,Series B 2012年第3期33卷 351-366页

作者： zhigang wang Yachun LI Department of Mathematics Shanghai Jiao Tong UniversityShanghai 200240China Department of Mathematics Fuyang Teachers CollegeFuyang 236029AnhuiChina Department of Mathematics Shanghai Jiao Tong UniversityShanghai 200240China

The authors are concerned with a zero-flux type initial boundary value problem for scalar conservation ***,a kinetic formulation of entropy solutions is ***,by using the kinetic formulation and kinetic techniques,the uniqueness of entropy solutions is ***,the parabolic approximation is studied and an error estimate of order η 1/3 between the entropy solution and the viscous approximate solutions is established by using kinetic techniques,where η is the size of artificial viscosity.

关键词： Scalar conservation laws Entropy solutions Kinetic formulation Uniaueness Error estimate

DRPS:efficient disk-resident parameter servers for distributed machine learning

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Frontiers of Computer Science 2022年第4期16卷 79-90页

作者： Zhen Song Yu Gu zhigang wang Ge Yu School of Computer Science and Engineering Northeastern UniversityShenyang110819China College of Information Science and Engineering Ocean University of ChinaQingdao266100China

Parameter server(PS)as the state-of-the-art distributed framework for large-scale iterative machine learning tasks has been extensively ***,existing PS-based systems often depend on memory *** memory constraints,machine learning(ML)developers cannot train large-scale ML models in their rather small local ***,renting large-scale cloud servers is always economically infeasible for research teams and small *** this paper,we propose a disk-resident parameter server system named DRPS,which reduces the hardware requirement of large-scale machine learning tasks by storing high dimensional models on *** further improve the performance of DRPS,we build an efficient index structure for parameters to reduce the disk I/O *** on this index structure,we propose a novel multi-objective partitioning algorithm for the ***,a flexible workerselection parallel model of computation(WSP)is proposed to strike a right balance between the problem of inconsistent parameter versions(staleness)and that of inconsistent execution progresses(straggler).Extensive experiments on many typical machine learning applications with real and synthetic datasets validate the effectiveness of DRPS.

关键词： parameter servers machine learning disk resident parallel model

Actinide endohedral boron clusters： A closed-shell electronic structure of U@B40

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Nano Research 2018年第1期11卷 354-359页

作者： Tianrong Yu Yang Gao Dexuan Xu zhigang wang Institute of Atomic and Molecular Physics 2ilin University Changchun 130012 China Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy Jilin University Changchun 130012 China

The distinctive electronic bonding properties of actinide-containing clusters have made them the subject of increased attention. Herein, we use density functional theory calculations to examine a unique actinide-encapsulated U@B40 cage structure, revealing that it exhibits a 32-electron （1S2P61Dl01FTM） closed-shell singlet configuration in which all s, p, d, and f shells of the U atom are filled. Furthermore, the binding energy of 8.22 eV calculated for this cluster implies considerable stability, and the simulated infrared and Raman spectra feature U-B40 stretching and pure B40 breathing vibration modes, respectively. These spectral characteristics may aid future experimental investigations. Thus, this work not only describes a new member of the superatomic family, but also provides a method of encapsulating radioactive actinides.

关键词： actinide-containing cluster 32-electronprinciple superatomic orbital vibrational spectra density functional theory(DFT) calculation

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Optics-driven drone

Science China(Information Sciences) 2024年第2期67卷 322-324页

作者： Xuelong LI Guan HUANG zhigang wang Bin ZHAO School of Artificial Intelligence OPtics and Electro Nics (iOPEN)Northwestern Polytechnical University Shanghai Artificial Intelligence Laboratory

In the field of vicinagearth security, low-altitude flying vehicles such as drones play an indispensable role in aerial remote sensing, intelligent search and rescue, etc. [1]. It can be foreseen that the autonomous and intelligent execution of complex tasks by drones is an inevitable trend for future development.

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Design and validation of a variable camber wing structure

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Chinese Journal of Aeronautics 2024年第2期37卷 1-11页

作者： Xiasheng SUN Jingfeng XUE Jin ZHOU zhigang wang Wenjuan wang Mengjie ZHANG Chinese Aeronautical Establishment Beijing 100012China School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China Aircraft Strength Research Institute of China Xi’an 710065China Graduate School of Chinese Aeronautical Establishment Yangzhou 225002China

Variable camber wing technology is one of the important development trends of green aviation at *** smooth,seamless,continuous and adaptive change of wing camber,the aerodynamic performance is improved in achieving increase in lift and reduction in resistance and *** on the aerodynamic validation model CAE-AVM,Chinese Aeronautical Establishment(CAE)has carried out the design and validation of a variable camber wing,proposed an aerodynamic deformation matrix for the leading and trailing edges of aircraft wings in takeoff,landing and cruise *** structures and driving schemes are compared,and several key technology problems of leading and trailing edge deformation are solved.A full-size leading edge wind tunnel test piece with a span of 2.7 m and a trailing edge ground function test piece are *** deformation and shape maintenance capabilities of the leading edge is verified under real wind load conditions,and the load bearing and deformation capabilities of the trailing edge is verified under simulated follow-on *** results indicate that the leading and trailing edges of the variable camber wing can achieve the required deformation angle and have a certain load-bearing *** study can provide some insights into the application of variable camber wing technology for civil aircraft.

关键词： Variable camber wing Leading edge Trailing edge Structure Measurement and control Test

Difference analysis of Doppler ultrasound blood flow of Cunkou(radial artery)pulse,Renying(carotid artery)pulse,and Fuyang(anterior tibial artery)pulse

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Journal of Traditional Chinese Medicine 2023年第1期43卷 168-174页

作者： wang Chao WU Qiong wang zhigang WEI Yun XU Shijie Postdoctoral Mobile Station of Chinese Academy of Traditional Chinese medicine Beijing 100700China Zang-xiang Teaching and Research Department the Institute of Basic Theory for Chinese MedicineChina Academy of Chinese Medical SciencesBeijing 100700China Finance Office Shandong College of Traditional Chinese MedicineYantai 264199China Department of Doppler Ultrasound Beijing Anzhen HospitalCapital Medical UniversityBeijing 100029China

OBJECTIVE:To analyze the Doppler ultrasound blood flow of Renying(carotid artery)pulse,Cunkou(radial artery)pulse,and Fuyang(anterior tibial artery)pulse in the normal group and the functional constipation with gastrointestinal heat(FCGH)group,and to compare and explore the differences of Renying,Cunkou and Fuyang ***:Sixty normal subjects and 60 patients with gastrointestinal heat constipation were collected in the department of ultrasound,Beijing Anzhen Hospital,Capital Medical *** ultrasound was used to observe the blood flow indexes including maximum systolic velocity(Vp),maximum diastolic velocity(Vd),mean velocity(Vm),pulse index(PI),resistance index(RI),vascular diameter(D),and circulation blood flow cycle(ET)of Renying pulse,Cunkou pulse and Fuyang pulse in the normal group and patients with gastrointestinal heat *** differences of these three pulses were compared between the normal group and the FCGH ***:The PI,Vp,Vm,RI,and D of the three pulses in the normal group were statistically significant different(P<0.01).In the comparison of Doppler flow diagram of three pulses in the FCGH group,there were significant differences in PI,Vd,Vp,Vm,RI,and D(P<0.01).CONCLUSION:Under normal conditions,the indexes of Renying pulse Doppler flow diagram,Cunkou pulse Doppler flow diagram,and Fuyang pulse Doppler flow diagram are significantly *** the FCGH group,most of the indexes of Renying pulse Doppler flow diagram,Cunkou pulse Doppler flow diagram,and Fuyang pulse Doppler flow diagram are *** result verified the necessity of simultaneous examinations of all Renying,Cunkou,and Fuyang pulses in modern Chinese medicine.

关键词： Cunkou pulse Renying pulse Fuyang pulse Doppler flow diagram functional constipation gastrointestinal heat type pulse index resistance index

Thiel-embalming technique:investigation of possible modification in embalming tissue as evaluation model for radiofrequency ablation

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The Journal of Biomedical Research 2019年第4期33卷 280-288页

作者： Peiyu Liao zhigang wang Institute for Medical Science and Technology University of DundeeDundeeScotland DD2 1FDUnited Kingdom School of Engineering Physics and MathematicsUniversity of DundeeDundeeScotland DD1 4HNUnited Kingdom College of Chemistry and Chemical Engineering Hunan UniversityChangshaHunan 410000China College of Engineering Peking UniversityBeijing 100671China.

Contrary to freezing preservation and formalin embalming,Thiel embalmed cadaver presents soft texture and color very close to that of living organism,and many applications based on Thiel embalmed cadavers have been ***,Thiel embalmed cadavers cannot be used as reliable evaluation model for radiofrequency ablation(RFA)due to dramatic changes of electrical conductivity in the embalmed *** address this issue,we investigated various modifications of the original Thiel embalming *** altering the chemicals' species and concentration we figured out a formula that can greatly reduce the embalming fluid's electrical conductivity without significantly compromising the 18-day embalmed kidney samples' suppleness and *** also investigated a two-stage embalming technique by first submerging the kidney sample into original Thiel's tank fluid for 28 days,then the sample was withdrawn from the tank fluid and placed into modified dilution fluids for additional two *** and discoloration occurred in these diluted samples implying the reversibility of Thiel-embalmed tissues' suppleness and color with the removal of the strong *** study presents a modified embalming method which could be used for RPA evaluation and also helps our understanding of the mechanism of embalmment process.

关键词： Cadaver embalmment Thiel's embalming fluid electrical conductivity radiofrequency ablation