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The bedform morphology of Chinese sturgeon spawning sites in the Yangtze River

International Journal of Sediment Research 2013年第3期28卷 421-429页

作者： Yu-jun YI shang-hong ZHANG zhao-yin WANG Ministry of Education Key Laboratory of water and sediment Scienc Beijing Normal University State Key Joint Laboratory of Environment Simulation and Pollution Contro Beijing Normal University Renewable Energy School North China Electric Power University State Key Laboratory of Hydroscience and Engineering Department of Hydraulic EngineeringTsinghua University

Quantitative measures of the relationships between channel morphology and the habitat use of Chinese sturgeon(Acipenser sinensis) can help management and regulatory agencies to quantify potential spawning habitats and develop recovery goals in view of the decreasing area of sturgeon spawning *** study determined the specific bedform types at the pool-riffle scale and evaluated the slopes,aspects and bed load gradation composition of Chinese sturgeon spawning areas in the Yangtze River,China.A bedform differencing technique was used to objectively quantify the longitudinal riverbed profile into four distinct pool-riffle units that were independent of *** vertical location of thalweg points within these units was quantified with a riffle proximity *** sturgeon spawning areas were mapped and correlated with the pool-riffle units,slopes and *** results indicate that Chinese sturgeon spawning areas occur primarily in *** majority of Chinese sturgeon spawning occurred at elevations greater than 75%of the difference in elevation between the nearest riffle crest and the pool *** slope of spawning sites was distributed between 0.05 and 6.36,and the average aspects were 219.92 and 207.63,*** bed load is mainly composted of gravel and pebble,sediment diameter concentrated on *** analyses of bedform morphology will assist regional fish managers in quantifying existing and potential Chinese sturgeon spawning habitats and will provide a quantitative framework for evaluating general ecological implications of channel morphology in the Yangtze River.

关键词： Riverbed morphology Pool-riffle units Slope Aspect Chinese sturgeon

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Developing sensor materials for screening intestinal diseases

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Materials Futures 2022年第2期1卷 64-88页

作者： Cheng zhao Xiaoxuan Zhang Guopu Chen Luoran shang shanghai Xuhui Central Hospital Zhongshan-Xuhui Hospitaland the Shanghai Key Laboratory of Medical EpigeneticsInternational Co-laboratory of Medical Epigenetics and Metabolism(Ministry of Science and TechnologyInstitutes of Biomedical Sciences)Fudan UniversityShanghaiPeople’s Republic of China Department of Gastroenterology Institute of Translational MedicineThe Affiliated Drum Tower Hospital of Nanjing University Medical School210008 NanjingPeople’s Republic of China State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096People’s Republic of China Oujiang Laboratory(Zhejiang Laboratory for Regenerative Medicine Vision and Brain Health)Wenzhou HospitalWenzhouZhejiang325001People’s Republic of China

Intestinal diseases that have high mortality and morbidity rates and bring huge encumbrance to the public medical system and economy worldwide,have always been the focus of clinicians and scientific *** diagnosis and intervention are valuable in the progression of many intestinal ***,the emergence of sensor materials can effectively assist clinical early diagnosis and health *** accurately locating the lesion and sensitively analyzing the level of disease markers,these sensor materials can help to precisely diagnose the stage and state of lesions,thereby avoiding delayed *** this review,we provide comprehensive and in-depth knowledge of diagnosing and monitoring intestinal diseases with the assistance of sensor materials,particularly emphasizing their design and application in bioimaging and *** review is dedicated to conveying practical applications of sensor materials in the intestine,critical analysis of their mechanisms and applications and discussion of their future roles in *** believe that this review will promote multidisciplinary communication between material science,medicine and relevant engineering fields,thus improving the clinical translation of sensor materials.

关键词： sensors intestine disease bioimaging biodetection

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基于视频游戏的空间能力测评

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心理科学进展 2025年第1期33卷 11-24页

作者：尚俊杰石祝沈科杰北京大学教育学院学习科学实验室北京100871

空间能力是个体对客体或空间图形在头脑中进行识别、编码、贮存、表征、分解组合和抽象概括的能力,是个体理解自身所处环境并解决问题的认知基础。准确、便捷、有效地测评空间能力,对增强STEM教育教学水平和人才培养质量都具有重要意义... 详细信息

空间能力是个体对客体或空间图形在头脑中进行识别、编码、贮存、表征、分解组合和抽象概括的能力,是个体理解自身所处环境并解决问题的认知基础。准确、便捷、有效地测评空间能力,对增强STEM教育教学水平和人才培养质量都具有重要意义。由于空间能力受多因素共同作用,具有复杂性、多维度、内隐性的特点,使得利用计算机评价空间能力比较困难。本研究旨在准确、有效、大规模地测评空间能力,将使用多模态学习分析方法探索学习者空间认知行为表现特征,并基于视频游戏环境研发空间能力隐形测评关键技术与工具。具体包括:1)构建空间能力内在表征框架和评价指标体系;2)基于多模态学习分析构建学习者空间能力行为表现模型;3)探索视频游戏影响空间能力的关键因素,并使用游戏引擎开发基于视频游戏的测评工具;4)使用以证据为中心的设计框架和贝叶斯网络模型,开发并部署能够推断和预测空间能力的测评算法;5)在实验室和真实课堂情境开展实证研究,验证测评工具有效性。研究成果将有利于理解人类空间认知过程和行为表现,拓展和丰富空间能力相关理论,并为大规模数字化测评提供关键技术支撑。

关键词：基于游戏的测评空间能力多模态学习分析游戏化学习隐形测评

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Wettability control of defective TiO_(2)with alkyl acid for highly efficient photocatalytic ammonia synthesis

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Nano Research 2023年第8期16卷 10770-10778页

作者： Renquan Guan Xueying Cheng Yunning Chen Zhengkai Wu zhao zhao Qingkun shang Yingnan Sun Zaicheng Sun Faculty of Chemistry Northeast Normal UniversityChangchun 130024China Faculty of Physics Northeast Normal UniversityChangchun 130024China Instrumental Analysis Center Yancheng Teachers UniversityYancheng 224007China Center of excellence for environmental safety and biological effects Beijing Key Lab for Green Catalysis and SeparationFaculty of Environment and lifeBeijing University of TechnologyBeijing 100124China

Ammonia is an important chemical raw material and non-carbon-based *** ammonia production technology as a mild alternative to the traditional Harbor–Bosch route is carried out at the air,liquid,and solid three-phase *** the activation of N_(2),depressing hydrogen evolution reaction(HER),and increasing the local N_(2) concentration around the catalyst surface are critical factors in achieving high conversion *** this paper,we proposed that defective TiO_(2)is surfacemodified by alkyl acids with different carbon chain lengths(C_(2),C_(5),C_(8),C_(11),and C_(14))to tune the catalyst surface *** defect sites greatly promote N_(2) adsorption and *** wettability of the catalyst can be regulated from hydrophilic to hydrophobic by the length of the alkyl *** hydrophobic surface enhances the N_(2) adsorption and increases the local N_(2) concentration due to its ***,it depresses the proton adsorption and ***,the nitrogen reduction reaction(NRR)is greatly *** the series of samples,they present a systematic change and have a maximal NRR performance for n-octanoic acid-defective TiO_(2)(C8-Vo-TiO_(2);Vo=oxygen vacancy).The rate of ammonia production can be as high as 392μmol·g^(−1)·h^(−1).This work provides a new strategy for efficient ammonia synthesis at the three-phase interface using photocatalyst technology.

关键词： aerophilic modification alkyl acids defective TiO_(2) photocatalytic ammonia synthesis

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SegNet-based first-break picking via seismic waveform classification directly from shot gathers with sparsely distributed traces

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Petroleum Science 2022年第1期19卷 162-179页

作者： San-Yi Yuan Yue zhao Tao Xie Jie Qi shang-Xu Wang State Key Laboratory of Petroleum Resources and Prospecting CNPC Key Laboratory of Geophysical ExplorationChina University of PetroleumBeijing 102249China China Oilfield Services Ltd. TangguTianjin 300452China University of Oklahoma ConocoPhillips School of Geology and GeophysicsNormanOKUSA

Manually picking regularly and densely distributed first breaks(FBs)are critical for shallow velocitymodel building in seismic data ***,it is time *** employ the fullyconvolutional Seg Net to address this issue and present a fast automatic seismic waveform classification method to pick densely-sampled FBs directly from common-shot gathers with sparsely distributed *** feeding a large number of representative shot gathers with missing traces and the corresponding binary labels segmented by manually interpreted fully-sampled FBs,we can obtain a welltrained Seg Net *** any unseen gather including the one with irregular trace spacing is inputted,the Seg Net can output the probability distribution of different categories for waveform *** FBs can be picked by locating the boundaries between one class on post-FBs data and the other on pre-FBs *** land datasets with each over 2000 shots are adopted to illustrate that one well-trained 25-layer Seg Net can favorably classify waveform and further pick fully-sampled FBs verified by the manually-derived ones,even when the proportion of randomly missing traces reaches50%,21 traces are missing consecutively,or traces are missing regularly.

关键词： First-break picking Deep learning Irregular seismic data Waveform classification

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Exploration of the metabolic flexibility of glycogen accumulating organisms through metatranscriptome analysis and metabolic characterization

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Journal of Environmental Sciences 2023年第4期126卷 234-248页

作者： Bin zhao Yanping Yang Chen zhao Chunchun Zhang zhaohui Zhang Liang Wang shang Wang Jingfeng Wang School of Environmental Science Engineering Tiangong UniversityTianjin 300387China Department of Hygienic Toxicology and Environmental Hygiene Tianjin Institute of Environmental and Operational MedicineTianjin 300201China

Glycogen accumulating organisms(GAOs) are closely related to the deterioration of enhanced biological phosphorus removal systems. However, the metabolic mechanisms that drive GAOs remain unclear. Here, the two-thirds supernatant of a reactor were decanted following the anaerobic period to enrich GAOs. Long-term monitoring demonstrated that the system was stable and exhibited typical characteristics of GAOs metabolism. Acetate was completely consumed after 60 min of the anaerobic phase. The level of glycogen decreased from 0.20 to 0.14 g/gSS during the anaerobic phase, whereas the level of glycogen significantly increased to 0.21g/gSS at the end of the aerobic period. Moreover, there was almost no phosphate release and absorption in the complete periods, thus confirming the successful construction of a GAOs enrichment system. Microbial community analysis demonstrated that Ca. Contendobacter was among the core functional genera and showed the highest activity among all of the communities. Furthermore, our study is the first to identify the involvement of the ethyl-malonyl-CoA pathway in the synthesis of polyhydroxyvalerate via croR, ccr, ecm, mcd, mch and mcl genes. The Embden-Meyerhof-Parnas(EMP) pathway was preferentially used via glgP. Furthermore, the glyoxylate cycle was the main source of ATP under anaerobic conditions, whereas the tricarboxylic acid cycle provided ATP under aerobic conditions. aceA and mdh appeared to be major modulators of the glyoxylate pathway for controlling energy flow. Collectively, our findings not only revealed the crucial metabolic mechanisms in a GAOs enrichment system but also provided insights into the potential application of Ca. Contendobacter for wastewater treatment.

关键词： Glycogen accumulating organisms Intracellular storage Metatranscriptome Bacterial community Glyoxylate pathway

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Bio-inspired dual-adhesive particles from microfluidic electrospray for bone regeneration

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Nano Research 2023年第4期16卷 5292-5299页

作者： Lei Yang Xiaocheng Wang Yunru Yu Luoran shang Wei Xu Yuanjin zhao Department of Rheumatology and Immunology Nanjing Drum Tower HospitalSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)Wenzhou InstituteUniversity of Chinese Academy of SciencesWenzhou 325001China shanghai Xuhui Central Hospital Zhongshan-Xuhui Hospitaland the Shanghai Key Laboratory of Medical Epigeneticsthe International Colaboratory of Medical Epigenetics and Metabolism(Ministry of Science and Technology)Institutes of Biomedical SciencesFudan UniversityShanghai 200032China Department of Orthopedics Tongren HospitalShanghai Jiao Tong University School of MedicineShanghai 200336China

Bioadhesive hydrogels have demonstrated great potential in bone ***,the relatively simple adhesion mechanism and lack of intricate structural design restrict their further ***,inspired by multiple adhesion mechanisms of pollen particles and marine mussels,we present a novel type of dual-adhesive hydrogel particles fabricated from microfluidic electrospray for bone *** the particles are rapidly solidified via liquid nitrogen-assisted cryogelation,they exhibit pollen-mimicking hierarchical porous morphology and gain structure-related ***,the particles are further coated by polydopamine(PDA)to achieve molecular-level adhesion especially to physiological wet surfaces of bone *** from such dual-adhesion mechanisms,the particles can strongly adhere to bone tissue defects,and function as porous ***,the dual-adhesive particles can serve as effective vehicles to release key growth factors more than two *** vitro experiments showed that the growth factors-loaden particles have excellent biocompatibility and more significantly promote angiogenesis(~2-fold)and osteogenic differentiation(~3-fold)than *** vivo experiments indicated that the dual-adhesive particles could significantly enhance bone regeneration(~4-fold)than control by coupling osteogenesis and angiogenesis *** on these features,the bio-inspired dual-adhesive particles have great potentials for bone repair and wound healing applications.

关键词： microfluidics particles growth factors adhesion bone regeneration

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Probing magnetic-proximity-effect enlarged valley splitting in monolayer WSe2 by photoluminescence

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Nano Research 2018年第12期11卷 6252-6259页

作者： Chenji Zou Chunxiao Cong Jingzhi shang Chuan zhao Mustafa Eginligil Lishu Wu Yu Chen Hongbo Zhang Shun Feng Jing Zhang Hao Zeng Wei Huang ting Yu Address correspondence to ting Yu yuting@ntu.edu.sg Chunxiao Cong cxcong@*** Hao Zeng haozeng@bufalo.edu Wei Huang lamwhuang( ***

Possessing a valley degree of freedom and potential in information processing by manipulating valley features (such as valley splitting), group-VI monolayer transition metal dichalcogenides have attracted enormous interest. This valley splitting can be measured based on the difference between the peak energies of σ+ and σ− polarized emissions for excitons or trions in direct band gap monolayer transition metal dichalcogenides under perpendicular magnetic fields. In this work, a well-prepared heterostructure is formed by transferring exfoliated WSe2 onto a EuS substrate. Circular-polarization-resolved photoluminescence spectroscopy, one of the most facile and intuitive methods, is used to probe the difference of the gap energy in two valleys under an applied out-of-plane external magnetic field. Our results indicate that valley splitting can be enhanced when using a EuS substrate, as compared to a SiO2/Si substrate. The enhanced valley splitting of the WSe2/EuS heterostructure can be understood as a result of an interfacial magnetic exchange field originating from the magnetic proximity effect. The value of this magnetic exchange field, based on our estimation, is approximately 9 T. Our findings will stimulate further studies on the magnetic exchange field at the interface of similar heterostructures.

关键词： valley splitting transition metal dichalcogenides magnetic proximity effect heterostructure magnetic exchange field

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Efficient Computational Approach for Predicting the 3D Acoustic Radiation of the Elastic Structure in Pekeris Waveguides

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Journal of Ocean University of China 2022年第4期21卷 903-916页

作者： QIAN Zhiwen HE Yuanan shang Dejiang zhao Haihan ZHAI Jingsheng School of Marine Science and Technology Tianjin UniversityTianjin 300072China Systems Engineering Research Institute Beijing 100036China College of Underwater Acoustics Engineering Harbin Engineering UniversityHarbin 150001China

Ocean boundaries present a significant effect on the vibroacoustic characteristics and sound propagation of an elastic structure in *** this study,an efficient finite element/wave superposition method(FE/WSM)for predicting the three-dimen-sional acoustic radiation from an arbitrary-shaped radiator in Pekeris waveguides with a lossy seabed is *** method is based on the FE method(FEM),WSM,and sound propagation ***,a near-field vibroacoustic model is established by the FEM to obtain vibration information on a radiator ***,the WSM based on the Helmholtz boundary integral is used to pre-dict the far-field acoustic radiation and ***,the rigorous image source method and complex normal mode are employed to obtain the near-and far-field Green’s function(GF),*** former,which is based on the spherical wave decomposition,is adopted to accurately solve the near-field source strength,and the far-field acoustic radiation is calculated by the latter and perturbation *** simulations of both models are compared to theoretical wavenumber integration ***,numerical experiments on elastic spherical and cylindrical shells in Pekeris waveguides are presented to validate the accuracy and efficiency of the proposed *** results show that the FE/WSM is adaptable to complex radiators and ocean-acoustic envi-ronments,and are easy to implement and computationally efficient in calculating the structural vibration,acoustic radiation,and sound propagation of arbitrarily shaped radiators in practical ocean environments.

关键词： elastic structure acoustic radiation Pekeris waveguide wave superposition method Green’s function image source method spherical wave decomposition

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A GQD-based composite film as photon down-converter in CNT/Si solar cells

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Nano Research 2021年第11期14卷 3893-3899页

作者： Xuewei zhao Yizeng Wu Zhiyuan Xia Shulong Chang Yuanyuan shang Anyuan Cao School of Materials Science and Engineering Peking UniversityBeijing100871China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou450001China

Graphene quantum dots (GQDs), have unique quantum confinement effects, tunable bandgap and luminescence property, with a wide range of potential applications such as optoelectronic and biomedical areas. However, GQDs usually have a strong tendency toward aggregation especially in making solid films, which will degrade their optoelectronic properties, for example, causing undesired fluorescence quenching. Here, we designed a composite film by embedding GQDs in a polyvinyl pyrrolidone (PVP) matrix through hydrogen bonding with well-preserved fluorescence, with a small addition of acid for compensating the poor conductivity of PVP. As a multifunctional solid coating on carbon nanotube/silicon (CNT/Si) solar cells, the photon down-conversion by GQDs and the PVP anti-reflection layer for visible light lead to enhanced external quantum efficiency (by 12.34% in the ultraviolet (UV) range) and cell efficiency (up to 14.94%). Such advanced optical managing enabled by low-cost, carbon-based quantum dots, as demonstrated in our results, can be applied to more versatile optoelectronic and photovoltaic devices based on perovskites, organic and other materials.

关键词： graphene quantum dots polyvinyl pyrrolidone energy-down-shift external quantum efficiency CNT/Si solar cells

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