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6. Factors controlling the occurrence, distribution and physical properties of the Ordovician palaeokarstic reservoir in the Ordos Basin Daniudi gas field.

Author

Zhu, Ying, Ding, Xiaoqi, Zhang, Shaonan, Gao, Jingyun, Tian, Yinyu, Ma, Ning, Qi, Zhuang Zhuang, Liu, Xuan, and Hu, Xin

Subjects
PHYSICAL distribution of goods, DOLOMITE, PETROLOGY, BRECCIA, CALCITE, DIAGENESIS, ANHYDRITE
Abstract

The Daniudi gas field in China's Ordos Basin is located in the transitional zone between palaeo‐topographic highs and slopes, whereby dissolution‐collapse breccias are widespread within the palaeokarstic reservoir. Abundant cores, well logs and thin sections were used to study palaeo‐topography, palaeokarstic breccia types, diagenesis and reservoir pore characteristics. The results indicated that reservoir quality is controlled by lithology, palaeo‐topography and diagenesis. The extent of palaeokarstic reservoir dissolution was shown to be determined by lithologic differences, whilst only gypsiferous dolostones and finely crystalline dolostones emerged in reservoir formation. Palaeo‐topography was also found to regulate reservoir development. The reservoirs are primarily located 20 m below the Ordovician unconformity in palaeo‐topographic hills and palaeo‐topographic slopes, whilst their depth is palaeo‐topography dependent. Lithology and palaeo‐topography also coordinate the distribution of palaeokarst breccia facies. Clast‐supported and matrix‐supported chaotic breccias were found in argillaceous dolostone strata. However, crackle–mosaic breccias occurred in gypsiferous dolostones and crystalline dolostones, located in palaeogeomorphic residual hills and slopes. Reservoirs generally develop in crackle–mosaic breccias of Ma51 and Ma52 sub‐Members, the quality of such reservoirs is dependent on the development and distribution of palaeokarst breccia facies and diagenesis. Dissolution of dolomite and anhydrite nodules was found to result in moldic pores and dissolution‐enlarged pores. Overall, the most damaging effect on reservoir quality resulted from calcite cement infilling moldic pores, enlarged pores and fractures. [ABSTRACT FROM AUTHOR]

Published
2023
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7. Thickness Influence on the Creep Response of DD6 Ni-Based Single-Crystal Superalloy

Author

Wen Zhixun, Pei Haiqing, Li Dongfan, Yue Zhufeng, and Gao Jingyun

Subjects
nickel-based single-crystal superalloy, thickness effect, fracture mode, necking, creep cavities, oxide thickness, Technology, Chemical technology, TP1-1185, Chemicals: Manufacture, use, etc., TP200-248
Abstract

The effect of specimen thickness on the creep response of Ni-based single-crystal superalloy DD6 was investigated. With the thickness of 0.3 mm, 0.6 mm and 1.2 mm, a series of thin-wall specimens were tested in this paper respectively at 760℃, 980℃ and 1,100℃. Under the conditions of lower temperatures and higher stresses, the creep life of thin-wall specimens increases with the increase of δ, but it is almost equal under higher temperatures and lower stresses conditions. Compared with the standard specimens, an obvious reduction (about 60%) of creep life of the thin-wall specimens was found at 760℃, whereas it is almost the same at 980℃ and 1,100℃. Therefore, obvious thickness effect is prone to lower temperature and higher stress. The thickness effect is a comprehensive effect, which is caused by fracture mode, the degree of necking, the shape and quantity of creep cavities, oxide thickness, etc. Under each condition, an increased thickness resulted in increased creep strain to rupture.

Published
2016
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12. Identification of susceptibility variants to benign childhood epilepsy with centro-temporal spikes (BECTS) in Chinese Han population

Author

Shi, Xiu Yu, Wang, Geng, Li, Ting, Li, Zhixiu, Leo, Paul, Liu, Zhisheng, Wu, Gefei, Zhu, Hongmin, Zhang, Yuqin, Li, Dong, Gao, Li, Yang, Liu, Wang, Wei, Liao, Jianxiang, Wang, Jiwen, Zhou, Shuizhen, Wang, Hua, Li, Xiaojing, Gao, Jingyun, Zhang, Li, Shu, Xiaomei, Li, Dan, Li, Yan, Chen, Chunhong, Zhang, Xiuju, Partida, Gabriel Cuellar, Lundberg, Mischa, Reutens, David, Bartlett, Perry, Brown, Matthew A., Zou, Li Ping, Xu, Huji, Shi, Xiu Yu, Wang, Geng, Li, Ting, Li, Zhixiu, Leo, Paul, Liu, Zhisheng, Wu, Gefei, Zhu, Hongmin, Zhang, Yuqin, Li, Dong, Gao, Li, Yang, Liu, Wang, Wei, Liao, Jianxiang, Wang, Jiwen, Zhou, Shuizhen, Wang, Hua, Li, Xiaojing, Gao, Jingyun, Zhang, Li, Shu, Xiaomei, Li, Dan, Li, Yan, Chen, Chunhong, Zhang, Xiuju, Partida, Gabriel Cuellar, Lundberg, Mischa, Reutens, David, Bartlett, Perry, Brown, Matthew A., Zou, Li Ping, and Xu, Huji

Abstract

Background: Benign Childhood Epilepsy with Centro-temporal Spikes (BECTS) is the most common form of idiopathic epilepsy in children, accounting for up to 23% of pediatric epilepsy. The pathogenesis of BECTS is unknown, but it is thought that genetic factors play a role in susceptibility to the disease. Methods: To investigate the role of common genetic variants in BECTS pathogenesis, a 2-stage genome-wide association study (GWAS) was performed in 1,800 Chinese Han BECTS patients, and 7,090 healthy controls. Genetic findings were used in a Mendelian Randomization study in the UK Biobank dataset to investigate the potential role of smoking in BECTS. Findings: Definitive evidence of a role for common-variant heritability was demonstrated, with heritability of BECTS of >10% observed even with conservative disease prevalence assumptions. Although no individual locus achieved genome-wide significance, twelve loci achieved suggestive evidence of association (5 × 10-8

Published
2020

13. Identification of susceptibility variants to benign childhood epilepsy with centro-temporal spikes (BECTS) in Chinese Han population

Author

Shi, Xiu-Yu, primary, Wang, Geng, additional, Li, Ting, additional, Li, Zhixiu, additional, Leo, Paul, additional, Liu, Zhisheng, additional, Wu, Gefei, additional, Zhu, Hongmin, additional, Zhang, Yuqin, additional, Li, Dong, additional, Gao, Li, additional, Yang, Liu, additional, Wang, Wei, additional, Liao, Jianxiang, additional, Wang, Jiwen, additional, Zhou, Shuizhen, additional, Wang, Hua, additional, Li, Xiaojing, additional, Gao, Jingyun, additional, Zhang, Li, additional, Shu, Xiaomei, additional, Li, Dan, additional, Li, Yan, additional, Chen, Chunhong, additional, Zhang, Xiuju, additional, Partida, Gabriel Cuellar, additional, Lundberg, Mischa, additional, Reutens, David, additional, Bartlett, Perry, additional, Brown, Matthew A, additional, Zou, Li-Ping, additional, and Xu, Huji, additional

Published
2020
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14. A Day in the Life

Author

Grissmer, Jane A., primary, Allen, W. Jumbé, additional, Gao, Jingyun, additional, Hill, Paulette C., additional, and Felt, Robert L., additional

Published
2002
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17. Identification of Susceptibility Variants to BECTS in Chinese Han Population

Author

Shi, Xiu-Yu, primary, Wang, Geng, additional, Li, Ting, additional, Li, Zhixiu, additional, Leo, Paul, additional, Liu, Zhisheng, additional, Wu, Gefei, additional, Zhu, Hongmin, additional, Zhang, Yuqin, additional, Li, Dong, additional, Gao, Li, additional, Yang, Liu, additional, Wang, Wei, additional, Liao, Jianxiang, additional, Wang, Jiwen, additional, Zhou, Shuizhen, additional, Wang, Hua, additional, Li, Xiaojing, additional, Gao, Jingyun, additional, Zhang, Li, additional, Shu, Xiaomei, additional, Li, Dan, additional, Li, Yan, additional, Chen, Chunhong, additional, Zhang, Xiuju, additional, Reutens, David, additional, Bartlett, Perry, additional, Brown, Matthew A., additional, Zou, Li-Ping, additional, and Xu, Huji, additional

Published
2019
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18. Analysis of Multiaxial Fatigue Evaluation in Engine Components Using an Improved Multiaxial Fatigue Life Model

Author

Kun Yang, Zhang Chengcheng, Ren Yuan, Li Ying, and Gao Jingyun

Subjects
Vibration, Stress (mechanics), Computer science, business.industry, Fatigue testing, Structural engineering, business
Abstract

Current design methodologies for LCF/HCF of aero engine components are based on traditional uniaxial stress/strain methods like strain-life (ε-N), stress-life (S-N) and Goodman / Haigh diagram approaches, often applied with a wide safe factors to account for uncertainties in the understanding of multiaxial loading and other effects. With constantly striving to improve the performance and life of gas turbine engines, there is a need to increase accuracy of life prediction and reduce maintenance cost. Some multiaxial fatigue methods like Manson-McKnight, Sines, Smith-Watson-Topper etc. were developed to convert the multiaxial stresses into an equivalent uniaxial stress. This conversion simply provides the treatment of both the mean stress, the stress amplitude and directions. However, critical locations in engine components often experience significant multiaxial non-proportional loading conditions, such as blades and LP/HP shafts are subjected to HCF loading associated with mixed bending and torsional vibration modes. In this paper, the use of a new multiaxial fatigue life model was explored in the prediction of multiaxial fatigue behavior in aeronautic materials and structural steel. This new life model is based on the multiaxial S-N curve and an improved multiaxial high-cycle fatigue criterion which validated before by authors. The applied range of this new multiaxial fatigue life model were also compared with other models. Several groups of solid and hollow specimens with different ductile materials were conducted and evaluated under multiaxial loading cases. The predictions based on the proposed model give a better statistical result than other models.

Published
2016

19. Regrowth of Template ZnO Nanowires for the Underlying Catalyst-Free Growth Mechanism

Author

Xu, Hongjun, Hou, Yumin, Gao, Jingyun, Zhu, Huichao, Zhu, Rui, Sun, Yanghui, Zhu, Xinli, Wang, Yazhou, Wang, Xiaowei, and Yu, Dapeng

Abstract

Using pre-existing ZnO nanowires as lattice-matched templates, we have systematically studied the catalyst-free regrowth of ZnO nanostructures in a chemical vapor deposition (CVD) system. Because the templates (or crystal seeds) provided nanoscale preferential nucleation sites for the subsequent growth, changing ZnO supersaturation and growth temperature led to distinct growth modes, from nonepitaxy to homoepitaxy and from axial to radial epitaxy. The perfect borderless homoepitaxial ZnO nanostructures demonstrate the inherent growth behaviors that were especially researched with the help of their position-dependent optical properties. Neither the self-catalyst vapor–liquid–solid (VLS) growth mechanism nor the defects-induced growth mechanism could explain most of these homoepitaxial growth modes. Instead, two-dimensional nucleation and step propagation model based on avapor–solid (VS) scenario was suggested and all these phenomena were well interpreted. In addition, our work presents a very convenient and well-controlled way of fabricating useful nanostructures in a CVD system.

Published
2024
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20. Polyreactivity and Autoreactivity among HIV-1 Antibodies

Author

Liu, Mengfei, primary, Yang, Guang, additional, Wiehe, Kevin, additional, Nicely, Nathan I., additional, Vandergrift, Nathan A., additional, Rountree, Wes, additional, Bonsignori, Mattia, additional, Alam, S. Munir, additional, Gao, Jingyun, additional, Haynes, Barton F., additional, and Kelsoe, Garnett, additional

Published
2015
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22. Electronic and Mechanical Coupling in Bent ZnO Nanowires

Author

Han, Xiaobing, Kou, Liangzhi, Lang, Xiaoli, Xia, Jianbai, Wang, Ning, Qin, Rui, Lu, Jing, Xu, Jun, Liao, Zhimin, Zhang, Xinzheng, Shan, Xudong, Song, Xuefeng, Gao, Jingyun, Guo, Wanlin, Yu, Dapeng, Han, Xiaobing, Kou, Liangzhi, Lang, Xiaoli, Xia, Jianbai, Wang, Ning, Qin, Rui, Lu, Jing, Xu, Jun, Liao, Zhimin, Zhang, Xinzheng, Shan, Xudong, Song, Xuefeng, Gao, Jingyun, Guo, Wanlin, and Yu, Dapeng

Abstract

A red shift of the exciton of ZnO nanowires is efficiently produced by bending strain, as demonstrated by a low-temperature (81 K) cathodoluminescence (CL) study of ZnO nanowires bent into L- or S-shapes. The figure shows a nanowire (Fig. a) with the positions of CL measurements marked. The corresponding CL spectra-revealing a peak shift and broadening in the region of the bend-are shown in Figure b.

Published
2009

23. Electronic and Mechanical Coupling in Bent ZnO Nanowires

Author

Xiaobing, Han, Kou, Liangzhi, Lang, Xiaoli, Xia, Jianbai, Wang, Ning, Qin, Rui, Lu, Jing, Xu, Jun, Liao, Zhimin, Zhang, Xinzheng, Shan, Xudong, Song, Xuefeng, Gao, Jingyun, Guo, Wanlin, Dapeng, Yu, Xiaobing, Han, Kou, Liangzhi, Lang, Xiaoli, Xia, Jianbai, Wang, Ning, Qin, Rui, Lu, Jing, Xu, Jun, Liao, Zhimin, Zhang, Xinzheng, Shan, Xudong, Song, Xuefeng, Gao, Jingyun, Guo, Wanlin, and Dapeng, Yu

Abstract

A red shift of the exciton of ZnO nanowires is efficiently produced by bending strain, as demonstrated by a lowtemperature (81 K) cathodoluminescence (CL) study of ZnO nanowires bent into L- or S-shapes. The figure shows a nanowire (Fig. a) with the positions of CL measurements marked. The corresponding CL spectra - revealing a peak shift and broadening in the region of the bend - are shown in Figure b. (Figure Presented).

Published
2009

37. Electronic and Mechanical Coupling in Bent ZnO Nanowires

Author

Han, Xiaobing, primary, Kou, Liangzhi, additional, Lang, Xiaoli, additional, Xia, Jianbai, additional, Wang, Ning, additional, Qin, Rui, additional, Lu, Jing, additional, Xu, Jun, additional, Liao, Zhimin, additional, Zhang, Xinzheng, additional, Shan, Xudong, additional, Song, Xuefeng, additional, Gao, Jingyun, additional, Guo, Wanlin, additional, and Yu, Dapeng, additional

Published
2009
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41. Ultralow electron mobility of an individual Cu-doped Zn O nanowire.

Author

Jia, Xiaokai, Xu, Hongjun, Gao, Jingyun, Jia, Xiaoning, Zhu, Huichao, and Yu, Dapeng

Subjects
ELECTRON mobility, ELECTRIC conductivity research, NANOWIRES, ZINC oxide films, FIELD-effect transistors
Abstract

In this work, we synthesized Cu-doped ZnO nanowires through a vapor-liquid-solid process. We investigated their composition and photoluminescence properties; and we found the Cu-doped ZnO nanowires have a c-axis preferential growth direction, uniform Cu distribution and a characteristic spectrum. We further investigated their electrical property by fabricating a simple field effect transistor based on an individual C-shaped Cu-doped ZnO nanowire. The electrical studies reveal that the Cu-doped ZnO nanowire has n-type conductivity and ultralow electron mobility. [ABSTRACT FROM AUTHOR]

Published
2013
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42. Growth mechanism study viain situepitaxial growth of high-oriented ZnO nanowiresElectronic supplementary information (ESI) available: additional data. See DOI: 10.1039/c0ce00208a.

Author

Sun, Yanghui, Zhao, Qing, Gao, Jingyun, Zhu, Rui, Wang, Xiaowei, Xu, Jun, Chen, Li, Zhang, Jingmin, and Yu, Dapeng

Subjects
EPITAXY, ZINC oxide, NANOWIRES, ORGANOZINC compounds, PHOTOLUMINESCENCE, COMPARATIVE studies
Abstract

In situepitaxial growth of high-oriented ZnO nanowires on annealed zinc film was realized in an environmental scanning electron microscope. Energy dispersive spectra, X-ray diffraction and photoluminescence measurements demonstrated that a thin layer of [001] ZnO was formed on the surface of zinc film after annealing. Formation of a ZnO layer on annealed zinc film caused dense [001] oriented nanowires compared to the sparse random nanowires grown on unannealed zinc film. Possible growth mechanism for the nanowires grown on annealed and unannealed film was discussed. This work offers a novel approach for effective epitaxial growth of high-oriented ZnO nanowires and helps to understand the growth mechanism of ZnO nanowires. [ABSTRACT FROM AUTHOR]

Published
2010

44. MgB2 Superconducting Whiskers Synthesized by Using the Hybrid Physical—Chemical Vapor Deposition.

Author

Wang, Yazhou, Zhuang, Chenggang, Gao, Jingyun, Shan, Xudong, Zhang, Jingmin, Liao, Zhimin, Xu, Hongjun, Yu, Dapeng, and Feng, Qingrong

Subjects
*METALLIC whiskers, *CHEMICAL vapor deposition, *PHYSICAL vapor deposition, *MAGNESIUM diboride, *STAINLESS steel, *SCANNING electron microscopes
Abstract

The article presents a study which demonstrates the magnesium diboride (MgB2) superconducting whiskers synthesized by hybrid physical-chemical vapor deposition (HPCVD). The HPCVD setups that were employed in this experiment were quartz chamber with induction heating and stainless steel chamber with resistivity heating. A scanning electron microscope was used to analyze the morphologies of the whiskers. It has observed an onset temperature of 39 K.

Published
2009
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45. MgB2 superconducting whiskers synthesized by using the hybrid physical-chemical vapor deposition.

Author

Wang Y, Zhuang C, Gao J, Shan X, Zhang J, Liao Z, Xu H, Yu D, and Feng Q

Abstract

In this work, MgB(2) whiskers were fabricated on a copper substrate by using the hybrid physical-chemical vapor deposition, which was one of the most effective ways to make high quality pure MgB(2) films, with the possible growth mechanism discussed. The whiskers are hexagonal and conelike and grow along the [0001] direction with a single-crystal structure. The onset transition temperature is approximately 39 K, which is among the best in the published nanostructure MgB(2) papers. Fabrication of nanoscale MgB(2) whiskers provides the fundamental understanding of the effect of dimensionality and size on superconductivity.

Published
2009
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