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Spontaneous anchoring Cl intoα-Co(OH)_(2) as efficient and stable oxygen reduction electrocatalysts for seawater battery

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Rare Metals 2024年第7期43卷 3074-3083页

作者： Wang Zheng Xue-Rong Zheng Qi Lu Yan-Hui Cao Yang Wang Hai-Peng Fu jin-feng zhang Yi-Da Deng Wen-Bin Hu School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin UniversityTianjin 300072China State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

Seawater battery is an advanced energy storage system that enables conversion of chemical energy to electricity by consuming metals,dissolved oxygen and seawater in anode,cathode and electrolyte,***,the oxygen reduction reaction(ORR)activity and stability of electrocatalysts can be easily deactivated due to the severe Cl~-permeation and corrosion in seawater ***,we developed a structural buffer engineering strategy by spontaneously anchoring Cl~-intoα-Co(OH)_(2) as efficient and stable ORR electrocatalysts,in which the ultrathinα-Co(OH)_(2) nanosheets were synthesized using an ultrafast solution high-temperature shock(SHTS)*** large lattice space(~0.8 nm)of layeredα-Co(OH)_(2) ensured the spontaneously penetration of Cl~-into the lattice structure and replaced part of OH~-to formα-Co(OH)_(2-x)Cl_*** continuous leaching and compensating of saturated Cl inα-Co(OH)_(2-x)Cl_x could enhance the Cl~-corrosion resistance and modulate electronic structure of Co metallic sites,thus improving the ORR electrocatalytic activity and stability in seawater ***α-Co(OH)_(2-x)Cl_x seawater batteries display superior onset and half-wave potentials of 0.71 and 0.66 V,respectively,which are much better than the counterparts ofα-Co(OH)_(2) and ofβ-Co(OH)_(2) with no Cl~-penetrating and no buffer ***α-Co(OH)_(2-x)Cl_x-based seawater batteries display stable open-circuit potential of 1.69 V and outstanding specific capacity of 1345 mAh·g^(-1).

关键词： Seawater battery Oxygen reduction electrocatalyst Solution high-temperature shock Structural buffer engineering

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Development of two-dimensional numerical wave tank based on lattice Boltzmann method

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Journal of Hydrodynamics 2020年第1期32卷 116-125页

作者： Guang-wei Liu Qing-he zhang jin-feng zhang State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China

A 2-D numerical wave tank(NWT)is developed using the lattice Boltzmann method(LBM)and a multi-relaxation-time(MRT)collision model coupled with an algebraic volume of fluid(VOF)scheme for free surface *** external force based on the momentum source function is used to generate the waves,and a zone of porous media is used to absorb the *** simulations of the progressive and standing waves show that the NWT can generate stable wave trains in agreement with the analytical solutions and eliminate the re-reflection *** NWT is used to simulate two problems encountered in practice,namely:the wave transformation over a submerged breakwater and the wave runup on a sea *** numerical predictions are in good agreement with the measured data.

关键词： Numerical wave tank(NWT) wave generation method volume of fluid(VOF) lattice Boltzmann method(LBM)

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Successful treatment of congenital palate perforation: A case report

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World Journal of Clinical Cases 2020年第1期8卷 175-178页

作者： jin-feng zhang Wen-Bin zhang Department of Oral and Craniomaxillofacial Surgery Ninth People’s Hospital Shanghai Jiaotong University School of MedicineNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of Stomatology

BACKGROUND Congenital palate perforation is extremely rare. There is controversy about its exact etiology and appropriate management. Here, a case of congenital palatal perforation is reported. The diagnosis and treatment of the disease are *** SUMMARY A full-term neonate boy was referred for oral and craniomaxillofacial surgery with a finding of a hole in the palate at birth. The operation was postponed after pediatric consultation because of the patient’s poor nutrition and underweight for his age. At the age of 10 mo, the patient underwent modified von Langenbeck palatoplasty. He was followed for four years after surgery without any signs of re-rupture. His speech was *** Considering the anatomy and etiology, congenital palate perforation can be classified as isolated or associated with submucous cleft palate, and the treatment procedure should be altered accordingly.

关键词： Congenital Palate Perforation Craniomaxillofacial Submucous cleft palate etiology von Langenbeck palatoplasty

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Influence of pump noise on the health of fish in a large pumping station

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Journal of Hydrodynamics 2022年第3期34卷 522-531页

作者： Fan zhang Lu-feng Zhu Xiao-tao Shi Ke Chen Desmond Appiah Shou-qi Yuan jin-feng zhang National Research Center of Pumps Jiangsu UniversityZhenjiang212013China Hubei International Science and Technology Cooperation Base of Fish Passage China Three Gorges UniversityYichang443002China

The axial flow pump,characteristic of a large flow,is widely used in pumping stations of hydraulic ***,the internal noise of the axial-flow pump of a high sound pressure level is notable,with a great influence on the fishing *** present,the studies of the impact of the noise on fish are mainly focused on the explosion,the offshore wind power plant,the ship and other fields,with little attention on the noise generated by the pumping *** paper applies the combination of the computational fluid dynamics and the Actran to study the sound pressure level distribution in the high-noise area inside the axial-flow pump and the noise distribution in the downstream areas of the pumping *** comparisons are made of the hearing threshold and the hearing damage threshold of fish,and it is revealed that the noise inside the axial-flow pump exceeds the hearing damage threshold of fish,which could lead to the hearing damage of over-pumped ***,the noises emitted from the pumping station to the downstream are beyond the fish hearing threshold and will also have a significant impact on the fish around the pumping *** study can provide a reference for studying the impact of the noise generated by various large-scale water transfer projects on fish.

关键词： Fish numerical analysis axial flow pump ACTRAN hearing impairment

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Effects of organic matter and salinity on the flocculation of kaolinites in a settling column

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Journal of Hydrodynamics 2021年第1期33卷 150-156页

作者： Zhong-yue Li jin-feng zhang Qing-he zhang Xiao-teng Shen Tong-qing Chen State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration Tianjin UniversityTianjin 300350China Key Laboratory of Ministry of Education for Coastal Disaster and Protection Hohai UniversityNanjing 210098China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing 210029China

The flocculation and the settling of the cohesive sediment play an important role in the sediment transport process,and they are affected by many *** the coasts and in the estuaries,the organic matter and the salinity are two significant *** this study,experiments are carried out to evaluate the flocculation and the settling of the kaolinite in cases of various organic matter and salinity solutions in quiescent *** optical multi-channel suspended concentration monitoring system is used to measure the sediment concentration and the floc *** results show that the settling velocity decreases with the increase of the organic matter content,and the floc size increases with the increase of the organic matter *** addition,an empirical formula for the settling velocity under the influence of the organic matter and the salinity based on the experimental results is proposed.

关键词： Kaolinite humic acid salinity settling velocity floc size distribution

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Wave effects on the anti-liquefaction of the seabed around composite bucket foundation of offshore wind turbines

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Journal of Hydrodynamics 2021年第6期33卷 1291-1302页

作者： Li-hua Wang jin-feng zhang Run-bo Cai jing-yuan Li State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Tianjin 300072China Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration Tianjin UniversityTianjin 300350China

By using the open-source software OpenFOAM and the grid generation tool the integrated computer engineering and manufacturing code for computational fluid dynamics(ICEM CFD),a computational fluid dynamics-computational structural dynamics(CFD-CSD)coupling model is *** dynamic response and the liquefaction of the seabed around the composite bucket foundation of the offshore wind turbines in the Xiangshui area of Jiangsu Province are *** pore water pressure,the effective stress,the liquefaction depth and the anti-liquefaction effect of the overlying stones are *** is shown that the seabed around the composite bucket foundation will be liquefied under 50 year return waves,the liquefaction width is approximately 1/3 of the wavelength,and the maximum liquefaction depth is approximately 1/4 of the wave *** addition,the overlying stones provide an effective anti-liquefaction ***,less porous overlying stones have a better anti-liquefaction effect.

关键词： Offshore wind turbine composite bucket foundation wave anti-liquefaction overlying stones

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Dissociation of gas hydrates by hydrocarbon migration and accumulation-derived slope failures:An example from the South China Sea

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Geoscience Frontiers 2022年第2期13卷 295-310页

作者： Zhi-feng Wan Wei zhang Chong Ma jin-Qiang Liang Ang Li Da-Jiang Meng Wei Huang Cheng-Zhi Yang jin-feng zhang Yue-feng Sun School of Marine Sciences Sun Yat-sen UniversityZhuhai 519082China Gas Hydrate Engineering Technology Center Guangzhou Marine Geological SurveyChina Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China School of Mathematics and Physics China University of Geosciences(Wuhan)Wuhan 430074China Qingdao Institute of Marine Geology Qingdao 266071China Department of Geology&Geophysics Texas A&M UniversityCollege Station 77843-3115United States

The mechanism of slope failure associated with overpressure that is caused by hydrocarbon migration and accumulation remains ***-resolution seismic data and gas hydrate drilling data collected from the Shenhu gas hydrate field(site SH5)offer a valuable opportunity to study the relations between submarine slope failure and hydrocarbon accumulation and flow that is associated with a~2 kmdiameter gas chimney developed beneath site SH5 where none gas hydrates had been recovered by drilling and sampling despite the presence of distinct bottom simulating reflectors(BSRs)and favorable gas hydrate *** mechanism of submarine slope failure resulted from buoyancy extrusion and seepage-derived deformation which were caused by overpressure from a~1100 m-high gas column in a gas chimney was studied via numerical ***~9.55 MPa overpressure caused by hydrocarbons that migrated through the gas chimney and then accumulated beneath subsurface gas hydratebearing impermeable *** may have resulted in a submarine slope failure,which disequilibrated the gas hydrate-bearing zone and completely decomposed the gas hydrate once precipitated at site *** the gas hydrate decomposition,the largely impermeable sediments overlying the gas chimney may have undergone a major upward deformation due to the buoyancy extrusion of the overpressure in the gas chimney,and slope failure was initiated from plastic strain of the sediments and reduced internal *** failure subsequently resulted in partial gas hydrate decomposition and sediment permeability *** pressurized gas in the gas chimney may have diffused into the overlying sediments controlled by seepage-derived deformation,causing an effective stress reduction at the base of the sediments and significant plastic *** may have formed a new cycle of submarine slope failure and finally the total gas hydrate *** modeling results of buoyancy extrusion and seepage-deri

关键词： Natural gas hydrate Submarine slope failure Gas chimney Buoyancy extrusion Seepage-derived deformation Shenhu area Northern South China Sea

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Clinical-radiomics predictors to identify the suitability of transarterial chemoembolization treatment in intermediate-stage hepatocellular carcinoma:A multicenter study

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Hepatobiliary & Pancreatic Diseases International 2023年第6期22卷 594-604页

作者： Dan-Dan Wang jin-feng zhang Lin-Han zhang Meng Niu Hui-Jie Jiang Fu-Cang Jia Shi-Ting feng Department of Radiology the Second Affiliated Hospital of Harbin Medical UniversityHarbin 150086China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055China Department of Breast Surgery Harbin Medical University Cancer HospitalHarbin 150081China Department of PET/CT the First Affiliated Hospital of Harbin Medical UniversityHarbin 150007China Department of Interventional Therapy the First Affiliated Hospital of China Medical UniversityShenyang 110001China Department of Radiology the First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510080China

Background: Although transarterial chemoembolization(TACE) is the first-line therapy for intermediatestage hepatocellular carcinoma(HCC), it is not suitable for all patients. This study aimed to determine how to select patients who are not suitable for TACE as the first treatment choice. Methods: A total of 243 intermediate-stage HCC patients treated with TACE at three centers were retrospectively enrolled, of which 171 were used for model training and 72 for testing. Radiomics features were screened using the Spearman correlation analysis and the least absolute shrinkage and selection operator(LASSO) algorithm. Subsequently, a radiomics model was established using extreme gradient boosting(XGBoost) with 5-fold cross-validation. The Shapley additive explanations(SHAP) method was used to visualize the radiomics model. A clinical model was constructed using univariate and multivariate logistic regression. The combined model comprising the radiomics signature and clinical factors was then established. This model’s performance was evaluated by discrimination, calibration, and clinical application. Generalization ability was evaluated by the testing cohort. Finally, the model was used to analyze overall and progression-free survival of different groups. Results: A third of the patients(81/243) were unsuitable for TACE treatment. The combined model had a high degree of accuracy as it identified TACE-unsuitable cases, at a sensitivity, specificity, and area under the receiver operating characteristic curve(AUC) of 0.759, 0.885, 0.906 [95% confidence interval(CI): 0.859-0.953] in the training cohort and 0.826, 0.776, and 0.894(95% CI: 0.815-0.972) in the testing cohort, respectively. Conclusions: The high degree of accuracy of our clinical-radiomics model makes it clinically useful in identifying intermediate-stage HCC patients who are unsuitable for TACE treatment.

关键词： Transarterial chemoembolization Hepatocellular carcinoma Radiomics Machine learning Prediction

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Rate-distortion optimized bitstream switching for peer-to-peer live streaming

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第4期9卷 445-456页

作者： jin-feng zhang Rong-gang WANG Jian-wei NIU Yuan DONG Hai-la WANG School of Computer Science and Technology Beijing University of Aeronautics and Astronautics Beijing 100083 China France Telecom R＆D Beijing Beijing 100080 China

Peer-to-peer (P2P) technology provides a cost-effective and scalable way to distribute video data. However, high heterogeneity of the P2P network, which rises not only from heterogeneous link capacity between peers but also from dynamic variation of available bandwidth, brings forward great challenge to video streaming. To attack this problem, an adaptive scheme based on rate-distortion optimization (RDO) is proposed in this paper. While low complexity RDO based frame dropping is exploited to shape bitrate into available bandwidth in peers, the streamed bitstream is dynamically switched among multiple available versions in an RDO way by the streaming server. Simulation results show that the proposed scheme based on RDO achieves great gain in overall perceived quality over simple heuristic schemes.

关键词： Stream switching Frame dropping Peer-to-peer (P2P) Rate-distortion optimization (RDO)

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Morphologic characters and element content during development of Pinus tabuliformis seeds

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Journal of Forestry Research 2016年第1期27卷 67-74页

作者： Hui Li Jian Zhao Chen Zhou Scott A.Merkle jin-feng zhang National Engineering Laboratory for Tree Breeding College of Biological Sciences and Biotechnology Beijing Forestry University Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants Ministry of Education Beijing Forestry University The Tree and Ornamental Plant Breeding and Biotechnology Laboratory of State Forestry Administration Beijing Forestry University Warnell School of Forestry and Natural Resources The University of Georgia

An embryo classification system for Pinus tabuliformis Carr. was established by time-tracing sam- pling and observation of zygotic embryos. The zygotic embryos were divided into nine stages. Key elements of the zygotic embryo and female gametophyte （FG） tissue of P. tabuliformis were analyzed, using inductively coupled plasma-emission spectroscopy. Several elements--includ- ing aluminum, iron, sodium, and copper--are found in both embryo and FG tissue. Boron, phosphorus, magnesium,zinc, and calcium are also required for zygotic embryo development and therefore accumulated. Manganese is selectively excluded from the embryo. The zygotic embryo development needs a low-sodium and high-potassium nutrition proportion. The results of elemental analysis from zygotic embryos and FGs can provide the mineral targets for optimizing the formulation of culture medium for somatic embryogenesis.

关键词： Embryo classification system Zygoticembryo Female gametophyte Element content analysis

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