检索结果-南通市图书馆

Regenerative Biomaterials 2024年第1期3卷 94-107页

作者： Shiao li dawei Niu Haowei Fang Yancheng chen Jinyan li Kunxi zhang Jingbo Yin Peiliang Fu Department of Orthopedics Shanghai Changzheng HospitalNaval Medical UniversityShanghai 200003P.R.China Department of Polymer Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444P.R.China

Platelet-rich plasma(PRP)that has various growth factors has been used clinically in cartilage ***,the short residence time and release time at the injury site limit its therapeutic *** present study fabricated a granular hydrogel that was assembled from gelatin microspheres and tannic acid through their abundant hydrogen *** microspheres with the gelatin concentration of 10wt%and the diameter distribution of 1-10 lm were used to assemble by tannic acid to form the granular hydrogel,which exhibited elasticity under low shear strain,but flowability under higher shear *** viscosity decreased with the increase in shear ***,the granular hydrogel exhibited self-healing feature during rheology ***,granular hydrogel carrying PRP not only exhibited well-performed injectability but also performed like a‘plasticine’that possessed good *** granular hydrogel showed tissue adhesion ability and reactive oxygen species scavenging *** hydrogel carrying PRP transplanted to full-thickness articular cartilage defects could integrate well with native cartilage,resulting in newly formed cartilage articular fully filled in defects and well-integrated with the native cartilage and subchondral *** unique features of the present granular hydrogel,including injectability,plasticity,porous structure,tissue adhesion and reactive oxygen species scavenging provided an ideal PRP carrier toward cartilage tissue engineering.

关键词： cartilage regeneration granular hydrogel gelatin tannic acid PRP

Joint fuzzy background and adaptive foreground model for moving target detection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2024年第2期18卷 93-106页

作者： dawei zhang Peng WANG Yongfeng DONG linhao li Xin li School of Artificial Intelligence Hebei University of TechnologyTianjin 300401China Lane Department of Computer Science and Electrical Engineering West Virginia UniversityMorgantownWV 26506-6109USA

Moving target detection is one of the most basic tasks in computer *** conventional wisdom,the problem is solved by iterative optimization under either Matrix Decomposition(MD)or Matrix Factorization(MF)*** utilizes foreground information to facilitate background *** uses noise-based weights to fine-tune the *** both noise and foreground information contribute to the recovery of the *** jointly exploit their advantages,inspired by two framework complementary characteristics,we propose to simultaneously exploit the advantages of these two optimizing approaches in a unified framework called Joint Matrix Decomposition and Factorization(JMDF).To improve background extraction,a fuzzy factorization is *** fuzzy membership of the background/foreground association is calculated during the factorization process to distinguish their contributions of both to background *** describe the spatio-temporal continuity of foreground more accurately,we propose to incorporate the first order temporal difference into the group sparsity constraint *** temporal constraint is adjusted *** foreground and the background are jointly estimated through an effective alternate optimization process,and the noise can be modeled with the specific probability *** experimental results of vast real videos illustrate the effectiveness of our *** with the current state-of-the-art technology,our method can usually form the clearer background and extract the more accurate ***-noise experiments show the noise robustness of our method.

关键词： matrixdecomposition matrix factorization generalized sparsity noise modeling

Engineering and finetuning expression of SerC for balanced metabolic flux in vitamin B6 production

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Synthetic and Systems Biotechnology 2024年第2期9卷 388-398页

作者： Kai chen linxia liu Jinlong li Zhizhong Tian Hongxing Jin dawei zhang School of Chemical Engineering and Technology Hebei University of TechnologyTianjinChina Tianjin Institute of Industrial Biotechnology Chinese Academy of SciencesTianjinChina National Center of Technology Innovation for Synthetic Biology TianjinChina Key Laboratory of Engineering Biology for Low-Carbon Manufacturing Tianjin Institute of Industrial BiotechnologyChinese Academy of SciencesTianjinChina University of Chinese Academy of Sciences BeijingChina

Vitamin B6 plays a crucial role in cellular metabolism and stress response,making it an essential component for growth in all known ***,achieving efficient biosynthesis of vitamin B6 faces the challenge of maintaining a balanced distribution of metabolic flux between growth and *** this study,our focus is on addressing this challenge through the engineering of phosphoserine aminotransferase(SerC)to resolve its redundancy and *** enzyme SerC was semi-designed and screened based on sequences and predicted kcat values,*** and heterologous proteins showing potential were then fine-tuned to optimize the production of vitamin *** resulting strain enhances the production of vitamin B6,indicating that different fluxes are distributed to the biosynthesis pathway of serine and vitamin *** study presents a promising strategy to address the challenge posed by multifunctional enzymes,with significant implications for enhancing biochemical production through engineering processes.

关键词： Vitamin B6 Phosphoserine aminotransferase SerC Protein engineering Multifunctional enzymes Metabolic flux distribution

Multi-scale design of silicon/carbon composite anode materials for lithium-ion batteries:A review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第10期97卷 30-45,I0002页

作者： liu Yang Shuaining li Yuming zhang Hongbo Feng Jiangpeng li Xinyu zhang Huai Guan Long Kong zhaohui chen State Key Laboratory of Heavy Oil Processing China University of Petroleum-BeijingBejing 102249China State Key Laboratoryof Mesoscience and Engineering Institute of Process EngineeringChinese Academy of Sciences Beijing 100190China Institute of Flexible Electronics(IFE) Northwestern Polytechnical UniversityXi'an 710129ShaanxiChina

Silicon/carbon composites,which integrate the high lithium storage performance of silicon with the exceptional mechanical strength and conductivity of carbon,will replace the traditional graphite electrodes for high-energy lithium-ion *** strategies have been designed to synthesize silicon/carbon composites for tackling the issues of anode pulverization and poor stability in the anodes,thereby improving the lithium storage *** effect of the regulation method at each scale on the final negative electrode performance remains ***,it has not been fully clarified how the regulation methods at each scale influence the final anode *** review will categorize the materials structure into three scales:molecular scale,nanoscale,and ***,the review will examine modification methods at the molecular scale,focusing on the interfacial bonding force between silicon and ***,it will summarize various nanostructures and special shapes in the nanoscale to explore the construction of silicon/carbon ***,the review will provide an analysis of microscale control approaches,focusing on the formation of composite particle with micron size and the utilization of *** review provides a comprehensive overview of the multi-scale design of silicon/carbon composite anode materials and their optimization strategies to enhance the performance of lithium-ion batteries.

关键词： lithium-ion batteries Silicon/carbon composites Molecular scale Nanoscale Microscale

Direct observation of oxygen vacancy formation and migration over ceria surface by in situ environmental transmission electron microscopy

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第4期42卷 676-682页

作者： dawei Pang Wei li Ningqiang zhang Hong He Shengcheng Mao Yanhui chen liwei Cao Chong li Ang li Xiaodong Han Beijing Key Laboratory of Solid Microstructure and Properties Department of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Beijing Key Laboratory for Green Catalysis and Separation The Faculty of Environment and LifeBeijing University of TechnologyBeijing10124China International Joint Research Laboratory for Quantum Functional Materials of Henan School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou450001China

The extremely high structural tolerance of ceria to oxygen vacancies(Ov)has made it a desirable catalytic material for the hydrocarbon oxidation to chemicals and pharmaceuticals and the reduction of gaseous *** is proposed that the formation and diffusion of Ov originate from its outstanding reduction ***,the formation and diffusion process of Ov over the surface of ceria at the atomic level is still ***,the structural and valence evolution of CeO_(2)(111)surfaces in reductive,oxidative and vacuum environments from room temperature up to 700℃was studied with in situ aberration-corrected environmental transmission electron microscopy(ETEM)*** is found to form under a high vacuum at elevated temperatures;however,the surface can recover to the initial state through the adsorption of oxygen atoms in an oxygen-contained ***,in hydrogen environment,the step-CeO_(2)(111)surface is not stable at elevated temperatures;thus,the steps tend to be eliminated with increasing *** with first-principles density function calculations(DFT),it is proposed that O-terminated surfaces would develop in a hypoxic environment due to the dynamic diffusion of Ov from the outer surface to the ***,in a reductive environment,H2 facilitates the formation and diffusion of Ov while Ce-terminated surfaces *** results reveal dynamic atomic-scale interplay between the nanoceria surface and gas,thereby providing fundamental insights into the Ov-dependent reaction of nano-CeO_(2) during catalytic processes.

关键词： Ceria Direct observation In situ ETEM Oxygen vacancy Density function calculations Rareearths

The influence of inter-band rock on rib spalling in longwall panel with large mining height

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2024年第4期34卷 427-442页

作者： Jiachen Wang Meng li zhaohui Wang Zheng li Han zhang Shixiong Song School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China Coal Industry Engineering Research Center of Top-coal Caving Mining Beijing 100083China Faculty of Engineering Hokkaido UniversitySapporo 060-8628Japan

In order to improve rib stability,failure criteria and instability mode of a thick coal seam with inter-band rock layer are analysed in this study.A three-dimensional mechanical model is established for the rib by considering the rock layer.A safety factor is defined foy the rib,and it is observed that the safety factor exhibits a positive correlation with the thickness and strength of the inter-band rock.A calculation method for determining critical parameters of the rock layer is presented to ensure the rib *** is revealed that incomplete propagation of the fracture at the hard rock constitutes a fundamental prerequisite for ensuring the rib *** influence of the position of the inter-band rock in the coal seam on failure mechanism of the rib was thoroughly investigated by developing a series of physical models for the rib at the face *** best position for the inter-band rock in the coal seam is at a height of 1.5 m away from the roof line,which tends to provide a good stability state for the *** different inter-band rock positions,two ways of controlling rib by increasing supports stiffness and flexible grouting reinforcement are proposed.

关键词： Rib spalling Inter-band rock Large mining height limit analysis Physical model experiment Numerical simulation

Regulating the crystal phase of bismuth-based semiconductors for promoted photocatalytic performance

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第6期67卷 1839-1864页

作者： zhaohui Wu Mei-Chi Chong Shiying zhang Junshan li Yongfa Zhu Hunan Key Laboratory of Applied Environmental Photocatalysis Changsha UniversityChangsha410022China Department of Chemistry Tsinghua UniversityBeijing100084China Institute for Advanced Study Chengdu UniversityChengdu610106China

Numerous bismuth-based semiconductors(BBSs)with sophisticated and desirable structures used as photocatalysts for efficient photocatalytic degradation of water organic contaminants have attracted considerable ***,regulating the crystal phases and phase transition of BBSs for promoted photocatalytic performance is ***,the unique crystal structure and band structure features of each typical BBSs,and the vital roles on phase controlling of each phase were systematically presented based on the classification of ***,the critical factors for the phase transition of BBSs and intrinsic driving forces endowed by phases of BBSs for enhanced photocatalytic performance of organic contaminants removal were also *** review will provide systematical guidelines and horizons for regulating the crystal phase and phase transition of BBSs,promoting photocatalytic degradation and mineralization of organic contaminants.

关键词： bismuth-based semiconductors phase regulation photocatalytic performances organic contaminants

Deformation characteristics and analog modeling of transtensional structures in the Dongying Sag,Bohai Bay Basin

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2024年第1期18卷 227-241页

作者： dawei DONG li ZHAO Weizhong zhang Jiyan li Ruixiang zhang Jianlei YANG Guangzeng WANG Shandong Institute of Petroleum and Chemical Technology Dongying 257061China College of Resources and Environment Shandong Agriculture UniversityTai᾽an 271018China Geophysical Research Institute of Shengli Oilfield Branch Company SINOPECDongying 257022China Research Institute of Petroleum Exploration&Development Shengli Oilfield CompanySINOPECDongying 257000China College of Marine Geosciences Ocean University of ChinaQingdao 266100China

Hydrocarbon exploration in the Dongying Sag is constrained by the development of many Cenozoic transtensional structures with complex patterns and dynamic *** study uses seismic interpretation and analog modeling to investigate these transtensional *** results include dividing these transtensional structures into boundary fault,oblique rifting,and deep strike-slip fault controlled structures,according to the relationships between main and secondary *** developed in the steep slope zone,the central sag zone,and the slope zone,*** profile,the transtensional structures formed appear to be semi-flower-like,step-like,or *** plan-view,they appear to be broom-like,soft-linked,or en-echelon ***,these transtensional structures are controlled by the oblique normal slip of boundary faults,by the oblique extension of sub-sags,and by the later extension of deep strike-slip *** geometric deformation of these transtensional structures is controlled by the angles between the regional extension direction and the strike of boundary faults,deep faults,or sub-sags,where a larger angle corresponds to less developed transtensional ***,the transtensional structures in the Dongying Sag were created by multi-phase and multi-directional extensions in the Cenozoic—which is also controlled by pre-existing *** strike of newborn secondary faults was determined by the regional extension direction and pre-existing structures.

关键词： transtensional structure seismic interpretation analogue modeling dynamic mechanism Dongying Sag

Ionization Engineering of Hydrogels Enables Highly Efficient Salt‑Impeded Solar Evaporation and Night‑Time Electricity Harvesting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第1期16卷 131-146页

作者： Nan He Haonan Wang Haotian zhang Bo Jiang dawei Tang lin li School of Energy and Power Engineering Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of EducationDalian University of TechnologyDalian 116024People’s Republic of China

Interfacial solar evaporation holds immense potential for brine desalination with low carbon footprints and high energy ***,as a tunable material platform from the molecular level to the macroscopic scale,have been considered the most promising candidate for solar ***,the simultaneous achievement of high evaporation efficiency and satisfactory tolerance to salt ions in brine remains a challenging scientific bottleneck,restricting the widespread ***,we report ionization engineering,which endows polymer chains of hydrogels with electronegativity for impeding salt ions and activating water molecules,fundamentally overcoming the hydrogel salt-impeded challenge and dramatically expediting water evaporating in *** sodium dodecyl benzene sulfonate-modified carbon black is chosen as the solar *** hydrogel reaches a ground-breaking evaporation rate of 2.9 kg m−2 h−1 in 20 wt%brine with 95.6%efficiency under one sun irradiation,surpassing most of the reported *** notably,such a hydrogel-based evaporator enables extracting clean water from oversaturated salt solutions and maintains durability under different high-strength deformation or a 15-day continuous ***,on the basis of the cation selectivity induced by the electronegativity,we first propose an all-day system that evaporates during the day and generates salinity-gradient electricity using waste-evaporated brine at night,anticipating pioneer a new opportunity for all-day resource-generating systems in fields of freshwater and electricity.

关键词： Solar evaporation Hydrogel evaporators Salt impeding Ionization engineering Cyclic vapor-electricity generation