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Ultra‑Efficient and Cost‑Effective Platinum Nanomembrane Electrocatalyst for Sustainable Hydrogen Production

Nano-Micro Letters 2024年第6期16卷 95-110页

作者： Xiang Gao shicheng Dai Yun Teng Qing Wang Zhibo zhang Ziyin Yang Minhyuk Park Hang Wang Zhe Jia Yunjiang Wang Yong Yang Department of Mechanical Engineering College of EngineeringCity University of Hong KongTat Chee AvenueKowloon TongKowloonHong KongPeople’s Republic of China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijingPeople’s Republic of China School of Engineering Science University of Chinese Academy of SciencesBeijingPeople’s Republic of China Laboratory for Microstructures Institute of MaterialsShanghai UniversityShanghaiPeople’s Republic of China School of Materials Science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjingPeople’s Republic of China Department of Materials Science and Engineering College of EngineeringCity University of Hong KongTat Chee AvenueKowloon TongKowloonHong KongPeople’s Republic of China

Hydrogen production through hydrogen evolution reaction(HER)offers a promising solution to combat climate change by replacing fossil fuels with clean energy sources.However,the widespread adoption of efficient electrocatalysts,such as platinum(Pt),has been hindered by their high cost.In this study,we developed an easy-to-implement method to create ultrathin Pt nanomembranes,which catalyze HER at a cost significantly lower than commercial Pt/C and comparable to non-noble metal electrocatalysts.These Pt nanomembranes consist of highly distorted Pt nanocrystals and exhibit a heterogeneous elastic strain field,a characteristic rarely seen in conventional crystals.This unique feature results in significantly higher electrocatalytic efficiency than various forms of Pt electrocatalysts,including Pt/C,Pt foils,and numerous Pt singleatom or single-cluster catalysts.Our research offers a promising approach to develop highly efficient and cost-effective low-dimensional electrocatalysts for sustainable hydrogen production,potentially addressing the challenges posed by the climate crisis.

关键词： Platinum Hydrogen evolution reaction Lattice distortion Heterogeneous strain

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Pump-stopping pressure drop model considering transient leak-off of fracture network

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Petroleum Exploration and Development 2023年第2期50卷 473-483页

作者： WANG Fei XU Jiaxin ZHOU Tong zhang shicheng State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China Chongqing Fuling Shale Gas Exploration and Development Co. Ltd.SinopecChongqing 408014China Petroleum Exploration and Production Research Institute SinopecBeijing 102206China

By introducing the coupling flow expressions of main fracture-matrix, secondary fracture-matrix and main fracture-secondary fracture into the traditional main fracture material balance equation, the “main fracture-secondary fracture-matrix” leak-off coupling flow model is established. The pressure-dependent fracture width equation and the wellbore injection volume equation are coupled to solve the pressure-rate continuity problem. The simulation and calculation of the bottomhole pressure drop and fracture network closure after the pump stopping in slickwater volumetric fracturing treatment are realized. The research results show that the log-log curve of pump-stopping bottomhole pressure drop derivative presents five characteristic slope segments, reflecting four dominant stages, i.e. inter-fracture crossflow, fracture network leak-off, fracture network closure and residual leak-off, after pump shutdown. At the initial time of pump shutdown for volumetric fracturing treatment of horizontal well, the crossflow between main and secondary fractures is obvious, and then the leak-off becomes dominant. The leak-off of main and secondary fractures shows a non-uniform decreasing trend. Specifically, the leak-off of main fractures is slow, while that of secondary fractures is fast;the fracture network as a whole presents the leak-off law of fast first, then slow, until close to zero. The influence of fracture network conductivity on the shape of pressure decline curve is relatively weaker than that of fracture network size. The fracture network conductivity is positively correlated with leak-off volume and fracture closure. The secondary fracture size is positively correlated with leakoff volume and closure of the secondary fracture, but negatively correlated with closure of the main fracture. Field data validation proves that the proposed model and simulation results can effectively reflect the closure characteristics of the fracture network, and the interpretation results are reliable and can reflect the non-uniform sti

关键词： volume fracturing stop-pumping pressure drop fracture network characteristic curve transient leak-off frac-ture closure stimulation performance

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Gene replacement therapy in Bietti crystalline corneoretinal dystrophy:an open-label,single-arm,exploratory trial

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Signal Transduction and Targeted Therapy 2024年第5期9卷 2275-2284页

作者： Jinyuan Wang Jinlu zhang shicheng Yu Hongyan Li Shaohong Chen Jingting Luo Haibo Wang Yuxia Guan Haihan zhang Shiyi Yin Huili Wang Heping Li Junle Liu Jingyuan Zhu Qiong Yang Ying Sha Chuan zhang Yuhang Yang Xuan Yang Xifang zhang Xiuli Zhao Likun Wang Liping Yang Wenbin Wei Beijing Tongren Eye Center Beijing Key Laboratory of Intraocular Tumor Diagnosis and TreatmentBeijing Ophthalmology&Visual Sciences Key LabMedical Artificial Intelligence Research and Verification Key Laboratory of the Ministry of Industry and Information TechnologyBeijing Tongren HospitalCapital Medical University100730 BeijingChina School of Clinical Medicine Tsinghua University100084 BeijingChina Chigenovo Co. Ltd.102206 BeijingChina Department of Ophthalmology Peking University Third HospitalBeijing Key Laboratory of Restoration of Damaged Ocular NervePeking University Third Hospital100191 BeijingChina Department of Ophthalmology The Third People’s Hospital of Dalian116091 DalianChina Department of Biomedical Informatics School of Basic Medical SciencesPeking University Health Science Center100191 BeijingChina Institute of Systems Biomedicine Department of PathologySchool of Basic Medical SciencesPeking University Health Science Center100191 BeijingChina

Bietti crystalline corneoretinal dystrophy is an inherited retinal disease caused by mutations in CYP4V2,which results in blindness in the working-age population,and there is currently no available treatment.Here,we report the results of the first-in-human clinical trial(NCT04722107)of gene therapy for Bietti crystalline corneoretinal dystrophy,including 12 participants who were followed up for 180-365 days.This open-label,single-arm exploratory trial aimed to assess the safety and efficacy of a recombinant adeno-associated-virus-serotype-2/8 vector encoding the human CYP4V2 protein(rAAV2/8-hCYP4V2).Participants received a single unilateral subretinal injection of 7.5×10^(10)vector genomes of rAAV2/8-hCYP4V2.Overall,73 treatment-emergent adverse events were reported,with the majority(98.6%)being of mild or moderate intensity and considered to be procedure-or corticosteroid-related;no treatment-related serious adverse events or local/systemic immune toxicities were observed.Compared with that measured at baseline,77.8%of the treated eyes showed improvement in best-corrected visual acuity(BCVA)on day 180,with a mean±standard deviation increase of 9.0±10.8 letters in the 9 eyes analyzed(p=0.021).By day 365,80%of the treated eyes showed an increase in BCVA,with a mean increase of 11.0±10.6 letters in the 5 eyes assessed(p=0.125).Importantly,the patients’improvement observed using multifocal electroretinogram,microperimetry,and Visual Function Questionnaire-25 further supported the beneficial effects of the treatment.We conclude that the favorable safety profile and visual improvements identified in this trial encourage the continued development of rAAV2/8-hCYP4V2(named ZVS101e).

关键词： cor dystrophy crystalline

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Hydraulic fracture geometry and proppant distribution in thin interbedded shale oil reservoirs

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Petroleum Exploration and Development 2022年第5期49卷 1185-1194页

作者： ZOU Yushi SHI Shanzhi zhang shicheng LI Jianmin WANG Fei WANG Junchao zhang Xiaohuan State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Engineering Technology Research Institute PetroChina Xinjiang Oilfield CompanyKaramay 834000China

Small-scale true triaxial sand fracturing experiments are conducted on thin interbedded shale samples made from cores of Permian Lucaogou Formation shale oil reservoir in Jimsar sag, Junggar Basin, NW China. Combined with high-precision CT scanning digital core model reconstruction technology, hydraulic fracture geometry and proppant distribution in thin interbedded shale oil reservoirs are studied. The research shows that: In thin interbedded shale oil reservoir, the interlayer difference of rock mechanics and the interlayer interface near the wellbore cannot restrain the growth of fracture height effectively, but has a significant impact on the fracture width distribution in the fracture height direction. Hydraulic fractures in these reservoirs tend to penetrate into the adjacent layer in “step-like” form, but have a smaller width at the interface deflection, which hinders the transport of proppant in vertical direction, resulting in a poor effect of layer-crossing growth. In shale layers with dense laminae, hydraulic fractures tend to form “丰” or “井” shapes. If the perforated interval is large in rock strength and high in breakdown pressure, the main fracture is fully developed initially, large in width, and supported by enough sand. In contrast, if the perforated interval is low in strength and rich in laminae, the fracturing fluid filtration loss is large, the breakdown pressure is low, the main fracture will not open wide initially, and likely to have sand plugging. Proppant is mainly concentrated in the main hydraulic fractures with large width near the perforated layer, activated laminae, branch fractures and fractures in adjacent layers contain only a small amount of(or zero) proppant. The proppant is placed in a limited range on the whole. The limit width of fracture that proppant can enter is about 2.7 times the proppant particle size.

关键词： shale oil thin interbedded reservoir rock mechanics lithologic interface hydraulic fracturing fracture shape proppant distribution

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Evolution mechanism of optical fiber strain induced by multi-fracture growth during fracturing in horizontal wells

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Petroleum Exploration and Development 2022年第1期49卷 211-222页

作者： CHEN Ming GUO Tiankui XU Yun QU Zhanqing zhang shicheng ZHOU Tong WANG Yunpeng College of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China College of Petroleum Engineering China University of PetroleumBeijing 102249China Research Institute of Petroleum Exploration&Development SinopecBeijing 100083China

A forward model for optical fiber strain was established based on a planar 3D multi-fracture model. Then the forward method calculating distributed fiber strain induced by multi-fracture growth was proposed. Based on this method, fiber strain evolution during fracturing of the horizontal well was numerically simulated. Fiber strain evolution induced by fracture growth can be divided into three stages: strain increasing, shrinkage convergence, and straight-line convergence, whereas the evolution of fiber strain rate has four stages: strain rate increasing, shrinkage convergence, straight-line convergence, and strain rate reversal after pumping stops. Fiber strain does not flip after pumping stop, while the strain rate flips after pumping stop so that strain rate can reflect injection dynamics. The time when the fracture extends to the fiber and inter-well pressure channeling can be identified by the straight-line convergence band of distributed fiber strain or strain rate, and the non-uniform growth of multiple fractures can be evaluated by using the instants of fractures reaching the fiber monitoring well.When the horizontal section of the fiber monitoring well is within the height range of a hydraulic fracture, the instant of the fracture reaching the fiber can be identified;otherwise, the converging band is not apparent. In multi-stage fracturing, under the influence of stress shadow from previous fracturing stages, the tensile region of fiber strain may not appear, but the fiber strain rate can effectively show the fracture growth behavior in each stage. The evolution law of fiber strain rate in single-stage fracturing can be applied to multi-stage fracturing.

关键词： horizontal well multi-stage fracturing optical fiber strain strain distribution forward model identification of multi-fracture growth

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Fracture propagation,proppant transport and parameter optimization of multi-well pad fracturing treatment

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Petroleum Exploration and Development 2023年第5期50卷 1225-1235页

作者： YANG Peng zhang shicheng ZOU Yushi LI Jianmin MA Xinfang TIAN Gang WANG Junchao State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Engineering Technology Research Institute PetroChina Xinjiang Oilfield CompanyKaramay 834000China

This paper establishes a 3D multi-well pad fracturing numerical model coupled with fracture propagation and proppant migration based on the displacement discontinuity method and Eulerian-Eulerian frameworks,and the fracture propagation and proppant distribution during multi-well fracturing are investigated by taking the actual multi-well pad parameters as an example.Fracture initiation and propagation during multi-well pad fracturing are jointly affected by a variety of stress interference mechanisms such as inter-cluster,inter-stage,and inter-well,and the fracture extension is unbalanced among clusters,asymmetric on both wings,and dipping at heels.Due to the significant influence of fracture morphology and width on the migration capacity of proppant in the fracture,proppant is mainly placed in the area near the wellbore with large fracture width,while a high-concentration sandwash may easily occur in the area with narrow fracture width as a result of quick bridging.On the whole,the proppant placement range is limited.Increasing the well-spacing can reduce the stress interference of adjacent wells and promote the uniform distribution of fractures and proppant on both wings.The maximum stimulated reservoir volume or multi-fracture uniform propagation can be achieved by optimizing the well spacing.Although reducing the perforation-cluster spacing also can improve the stimulated reservoir area,a too low cluster spacing is not conducive to effectively increasing the propped fracture area.Since increasing the stage time lag is beneficial to reduce inter-stage stress interference,zipper fracturing produces more uniform fracture propagation and proppant distribution.

关键词： multi-well pad multi-well fracturing fracture propagation proppant transport coupled numerical model fracturing parameter optimization

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Micro-mechanical properties of shale due to water/supercritical carbon dioxide-rock interaction

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石油勘探与开发:英文版 2023年第4期50卷 1001-1012页

作者： LI Ning JIN Zhijun zhang shicheng WANG Haibo YANG Peng ZOU Yushi ZHOU Tong State Key Laboratory of Shale Oil and Gas Enhancement Mechanisms and Effective Development Beijing 100083China SINOPEC Key Laboratory of Shale Oil/Gas Exploration and Production Technology Beijing 100083China State Energy Center for Shale Oil Research and Development Beijing 100083China SINOPEC Petroleum Exploration and Production Research Institute Beijing 100083China Institute of Energy Peking UniversityBeijing 100871China State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China

To investigate the impacts of water/supercritical CO_(2)-rock interaction on the micro-mechanical properties of shale,a series of high-temperature and high-pressure immersion experiments were performed on the calcareous laminated shale samples mined from the lower submember of the third member of Paleogene Shahejie Formation in the Jiyang Depression,Bohai Bay Basin.After that,grid nanoindentation tests were conducted to analyze the influence of immersion time,pressure,and temperature on micro-mechanical parameters.Experimental results show that the damage of shale caused by the water/supercritical CO_(2)-rock interaction was mainly featured by the generation of induced fractures in the clay-rich laminae.In the case of soaking with supercritical CO_(2),the aperture of induced fracture was smaller.Due to the existence of induced fractures,the statistical averages of elastic modulus and hardness both decreased.Meanwhile,compaction and stress-induced tensile fractures could be observed around the laminae.Generally,the longer the soaking time,the higher the soaking pressure and temperature,the more significant the degradation of micro-mechanical parameters is.Compared with water-rock interaction,the supercritical CO_(2)-rock interaction caused a lower degree of mechanical damage on the shale surface.Thus,supercritical CO_(2)can be used as a fracturing fluid to prevent the surface softening of induced fractures in shale reservoirs.

关键词： shale hydration supercritical CO_(2) micro-mechanical properties nanoindentation shale damage

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A new method to optimize the fracture geometry of a frac-packed well in unconsolidated sandstone heavy oil reservoirs

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Science China(Technological Sciences) 2012年第6期55卷 1725-1731页

作者： BIAN XiaoBing zhang shicheng zhang JingChen WANG Fei MOE Key Laboratory of Petroleum Engineering China University of PetroleumBeijing 102249China Heriot-Watt University Edinburgh EH144ASU.K.

The worldwide proven recoverable reserves of conventional oil are less than the amount of the heavy oil.Owing to weakly consolidated formation,sand production is an important problem encountered during oil production in heavy oil reservoirs,for which frac-pack technique is one of the most common treatments.Hence,how to obtain the optimal fracture geometry is the key to increasing well production and preventing sand.Due to the faultiness that current optimization of the fracture geometry only depends on well productivity,fracture-flow fraction was used to describe the contribution of the fracture collecting and conducting fluids from the reservoir.The higher the fracture-flow fraction,the more likely bilinear flow pattern occurs,thus leading to smaller flow resistance and better results in oil productivity and sand prevention.A reservoir numerical simulation model was established to simulate the long-term production dynamic of a fractured well in rectangular drainage areas.In order to reach the aim of increasing productivity meanwhile preventing sand,a new method based on Unified Fracture Design was developed to optimize the fracture geometry.For a specific reservoir and a certain amount of proppant injected to the target layer,there exits an optimal dimensionless fracture conductivity which corresponds to the maximum fracture-flow fraction,accordingly we can get the optimal fracture geometry.The formulas of the optimal fracture geometry were presented on square drainage area conditions,which are very convenient to apply.Equivalent Proppant Number was used to eliminate the impact of aspect ratios of rectangular drainage area,then,the same method to optimize the fracture geometry as mentioned for square drainage areas could be adopted too.

关键词：压裂充填技术几何形态稠油油藏疏松砂岩裂缝优化数值模拟模型包装

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Genomic Selection for Frogeye Leaf Spot Resistance in Soybean

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Journal of Northeast Agricultural University(English Edition) 2024年第1期31卷 11-19页

作者： Yao Lanning Chen Yizhi Li Haochen zhang Yue Xia Mingyu Ning shicheng Ning Hailong College of Arts and Sciences Northeast Agricultural UniversityHarbin 150030China College of Life Sciences Northeast Agricultural UniversityHarbin 150030China College of Economics and Management Northeast Agricultural UniversityHarbin 150030China College of Veterinary Medicine Northeast Agricultural UniversityHarbin 150030China Key Laboratory of Soybean Biology Ministry of EducationKey Laboratory of Soybean Biology and Breeding/GeneticsMinistry of AgricultureCollege of AgricultureNortheast Agricultural UniversityHarbin 150030China Zhongnongfa Wudalianchi Agricultural Technology Co. LtdWudalianchi 164100HeilongjiangChina

Soybean frogeye leaf spot(FLS) disease is a global disease affecting soybean yield, especially in the soybean growing area of Heilongjiang Province. In order to realize genomic selection breeding for FLS resistance of soybean, least absolute shrinkage and selection operator(LASSO) regression and stepwise regression were combined, and a genomic selection model was established for 40 002 SNP markers covering soybean genome and relative lesion area of soybean FLS. As a result, 68 molecular markers controlling soybean FLS were detected accurately, and the phenotypic contribution rate of these markers reached 82.45%. In this study, a model was established, which could be used directly to evaluate the resistance of soybean FLS and to select excellent offspring. This research method could also provide ideas and methods for other plants to breeding in disease resistance.

关键词： LASSO regression stepwise regression genomic selection model soybean frogeye leaf spot(FLS)disease

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Principal whitened gradient-projection algorithm for distribution control

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Science China(Information Sciences) 2013年第3期56卷 202-209页

作者： zhang shicheng Sun HuaFei LI ChunHui School of Mathematics Xuzhou Normal University Department of Mathematics Beijing Institute of Technology

In this paper,we use an information geometric algorithm to solve the distribution control problem.The new designed algorithm is called principal whitened gradient-projection algorithm.In the principal natural gradient step,we use principal whitened gradient algorithm to obtain an optimal trajectory of the weight vector on the B-spline manifold from the viewpoint of information geometry.In the projection step,we project the selected points on B onto M.The coordinates of the projections on M give the trajectory of the control input u.

关键词： principal whitened gradient distribution control Kullback divergence

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