检索结果-南通市图书馆

BMP-2/mBGPs/PLGA复合支架对唇腭裂骨缺损修复的体内外研究

在线全文

学校读者我要写书评

暂无评论

生物医学工程研究 2024年第4期43卷 271-279页

作者：高国兴尹光福张洲李江峰曹舜泽四川大学生物医学工程学院成都610044

为制备具备促进成骨和血管生成能力的人工多孔生物材料支架并探索其性能,本研究采用引入扩孔剂的水热合成法制备了大孔径介孔生物活性玻璃(mBGPs),通过真空浸渍法将骨形态发生蛋白-2(BMP-2)负载到mBGPs介孔中,随后结合溶剂浇铸粒子沥滤... 详细信息

为制备具备促进成骨和血管生成能力的人工多孔生物材料支架并探索其性能,本研究采用引入扩孔剂的水热合成法制备了大孔径介孔生物活性玻璃(mBGPs),通过真空浸渍法将骨形态发生蛋白-2(BMP-2)负载到mBGPs介孔中,随后结合溶剂浇铸粒子沥滤法成功制备了BMP-2/mBGPs与PLGA复合支架。材料表征结果表明,mBGPs呈空心球壳形式,为非晶相结构,具有无序的三维泡沫孔道结构,能持续溶出钙离子、磷酸根离子和硅酸根离子,同时mBGPs具有蛋白质负载和缓释的能力。体外实验结果表明,BMP-2/mBGPs/PLGA多孔支架利于大鼠骨髓间充质干细胞(rBMSCs)的黏附与增殖,能显著提高生物活性物质的分泌和表达。大鼠牙槽骨缺损动物模型的修复实验表明,该支架加速了新骨组织的生长速度和成熟。

关键词：唇腭裂治疗生物活性材料介孔材料生长因子负载骨组织工程支架骨缺损修复

MBG/PGA-PCL composite scaffolds provide highly tunable degradation and osteogenic features

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2022年第9期7卷 53-67页

作者： Jiangfeng Li Chunyi Wang Guoxing Gao Xing yin Ximing Pu Bing Shi Yang Liu Zhongbing Huang Juan Wang Jingtao Li guangfu yin College of Biomedical Engineering Sichuan UniversityChengdu610065PR China State Key Laboratory of Oral Diseases National Clinical Research Center for Oral DiseasesDepartment of Oral and Maxillofacial SurgeryWest China Hospital of StomatologySichuan UniversityChengdu610041PR China State Key Laboratory of Oral Diseases National Clinical Research Center for Oral DiseasesDepartment of OrthodonticsWest China Hospital of StomatologySichuan UniversityChengdu610041PR China Shandong Provincial Key Laboratory of Biomedical Polymers Shandong Academy of Pharmaceutical SciencesJinan250101PR China

It remains a challenge to achieve satisfactory balance between biodegradability and osteogenic capacity in biosynthetic bone *** this study,we aimed to address this challenge by incorporating mesoporous bioactive glass(MBG)into poly(caprolactone-co-glycolide)(PGA-PCL)at gradient ***/PGA-PCL(PGC/M)scaffolds with MBG incorporation ratio at 0,10%,25%and 40%(PGC/M0-40)were synthesized using a modified solvent casting-particulate leaching method,and their physiochemical and biological properties were comprehensively ***/M scaffolds exhibited highly perforated porous structure with a large-pore size of 300-450μm,with ordered MBGs of around 6.0 nm mesopores size uniformly *** increase in MBG incorporation ratio significantly improved the scaffold surface hydrophilicity,apatite-formation ability and pH stability,increased the weight loss rate while insignificantly influenced the molecular chains degradation of PGA-PCL component,and facilitated the attachment,spreading,viability and proliferation of rat bone marrow stromal cells(rBMSCs)on ***,rBMSCs cultured on PGC/M10-40 scaffolds demonstrated enhanced ALP activity and osteogenesis-related gene expression in a MBG dose-dependent manner as compared with those cultured on PGC/M0 *** implanted to the rat cranial bone defect,PGC/M25 and PGC/M40 scaffolds induced significantly better bone repair as compared to PGC/M0 and PGC/M10 ***,the biodegradability of PGC/M scaffolds correlated with the MBG incorporation *** data suggested this novel PGC/M scaffolds as promising bone repair biomaterial with highly tunable hydrophilicity,bioactivity,cytocompatibility,osteogenic activity as well as biodegradability.

关键词： Mesoporous bioactive glasses Poly(caprolactone-co-glycolide) Osteogenic differentiation Bone repair

Pyridinic-N doping carbon layers coupled with tensile strain of FeNi alloy for activating water and urea oxidation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green Energy & Environment 2024年第4期9卷 684-694页

作者： guangfu Qian Wei Chen Jinli Chen Li Yong Gan Tianqi Yu Miaojing Pan Xiaoyan Zhuo Shibin yin Guangxi Key Laboratory of Electrochemical Energy Materials College of Chemistry and Chemical EngineeringState Key Laboratory of Processing for Non-Ferrous Metal and Featured MaterialsGuangxi University100 Daxue RoadNanning530004China Institute for Structure and Function and Department of Physics Chongqing UniversityChongqing400030China

Exploitation of oxygen evolution reaction(OER)and urea oxidation reaction(UOR)catalysts with high activity and stability at large current density is a major challenge for energy-saving H_(2) production in water ***,we use the pyridinic-N doping carbon layers coupled with tensile strain of FeNi alloy activated by NiFe_(2)O_(4)(FeNi/NiFe_(2)O_(4)@NC)for efficiently increasing the performance of water and urea *** to the tensile strain effect on FeNi/NiFe_(2)O_(4)@NC,it provides a favorable modulation on the electronic properties of the active center,thus enabling amazing OER(η_(100)=196 mV)and UOR(E_(10)=1.32 V)intrinsic ***,the carbon-coated layers can be used as armor to prevent FeNi alloy from being corroded by the electrolyte for enhancing the OER/UOR stability at large current density,showing high industrial *** work thus provides a simple way to prepare high-efficiency catalyst for activating water and urea oxidation.

关键词： Carbon-encapsulated Tensile strain Catalyst Oxygen evolution reaction Urea oxidation reaction

Preparation and characterization of Eu^(3+)-doped CaCO_3 phosphor by microwave synthesis

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2009年第5期28卷 439-444页

作者： KANG Ming LIU Jun yin guangfu SUN Rong School of Materials Science and Engineering Southwest University of Science and Technology Mianyang 621010 China College of Materials Sctence and Engmeering Stchuan University Chengdu 610065 China Shenzhen Ocean＇s King Lighting Science and Technology Co. LTD. Shenzhen 518000 China

A Eu^3＋-doped CaCO3 phosphor with red emission was prepared by microwave synthesis. The scanning electron microscopy （SEM） image and laser particle size analysis show that the CaCO3：Eu^3＋ particles are needle-like in the length range of 5.0-10.0 μm. The results of X-ray diffraction （XRD） analysis, Fourier transform infrared spectroscopy （FT-IR）, and Raman spectroscopy indicate that pure aragonite CaCO3：Eu^3＋ is prepared using microwave irradiation and the Eu^3＋ ion as a luminescence center inhabits the site of Ca^2＋. The photoluminescence excitation （PLE） spectrum shows that the strong broad band at around 270 nm and weak sharp lines in 300-550 nm are assigned to the charge transfer band of Eu^3＋-O^2- and intra-configurational 4f-4f transitions of Eu^3＋, respectively. The photoluminescence （PL） spectrum implies that the red luminescence can be attributed to the transitions from the ^5D0 excited level to the ^7FJ （J = 0, 1, 2, 3, 4） levels of Eu^3＋ ions with the mainly electric dipole transition ^5D0 → ^7F2 （614 and 620 nm）, and the Eu^3＋ ions prefer to occupy the low symmetric site in the crystal lattice.

关键词： phosphors calcium carbonate Eu^3+-doped microwave synthesis photoluminescence

Real-Time Intelligent Diagnosis of Co-frequency Vibration Faults in Rotating Machinery Based on Lightweight-Convolutional Neural Networks

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2024年第2期37卷 264-282页

作者： Xin Pan Xiancheng Zhang Zhinong Jiang guangfu Bin Beijing Key Laboratory of Health Monitoring and Self-recovery for High-End Mechanical Equipment College of Mechanical and Electrical EngineeringBeijing University of Chemical TechnologyBeijing 100029China Key Laboratory of Engine Health Monitoring-Control and Networking(Ministry of Education) College of Mechanical and Electrical EngineeringBeijing University of Chemical TechnologyBeijing 100029China College of Mechanical Engineering Hunan University of Science and TechnologyXiangtan 411201China

The co-frequency vibration fault is one of the common faults in the operation of rotating equipment,and realizing the real-time diagnosis of the co-frequency vibration fault is of great significance for monitoring the health state and carrying out vibration suppression of the *** engineering scenarios,co-frequency vibration faults are highlighted by rotational frequency and are difficult to identify,and existing intelligent methods require more hardware conditions and are exclusively ***,Lightweight-convolutional neural networks(LW-CNN)algorithm is proposed in this paper to achieve real-time fault *** critical parameters are discussed and verified by simulated and experimental signals for the sliding window data augmentation *** on LW-CNN and data augmentation,the real-time intelligent diagnosis of co-frequency is ***,a real-time detection method of fault diagnosis algorithm is proposed for data acquisition to fault *** is verified by experiments that the LW-CNN and sliding window methods are used with high accuracy and real-time performance.

关键词： Co-frequency vibration Real-time diagnosis LW-CNN Data augmentation

Fast fixed-time three-dimensional terminal guidance with non-concave trajectory constraint

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第3期37卷 208-218页

作者： Youmin GONG Yanning GUO Yueyong LYU Dongyu LI guangfu MA Department of Control Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Cyber Science and Technology Beihang UniversityBeijing 100191China

Focusing on the non-concave trajectory constraint,a sliding-mode-based nonsingular feedback fast fixed-time three-dimensional terminal guidance of rotor unmanned aerial vehicle landing,planetary landing and spacecraft rendezvous and docking terminal phase with external disturbance is investigated in this ***,a fixed-time observer based on real-time differentiator is developed to compensate for the external disturbance,whose estimation error can converge to zero after a time independent of the initial ***,a sliding surface ensuring fixed-time convergence is *** sliding surface can guarantee that the vehicle achieves a non-concave trajectory,which is better for avoiding collision and maintaining the visibility of the landing site or docking ***,the nonsingular guidance ensuring the fixed-time convergence of the sliding surface is proposed,which is continuous and chatter *** last,three numerical simulations of Mars landing are performed to validate the effectiveness and correctness of the designed scheme.

关键词： Three-dimensional Terminal guidance Non-concave trajectory constraint Fast fixed-time control Sliding mode control

Effective Ultra-High-Speed Identification Scheme of Lightning Strikes Suitable for VSC-Based DC Grids

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2024年第2期10卷 548-561页

作者： Longlong Chen Xiangyu Pei Xiaoguang Wei Pengzhi Li guangfu Tang North China Electric Power University(NCEPU) Beijing 102206China Changsha University of Science and Technology Changsha 410114China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co.Ltd.Beijing 102209China

To ensure their sound and continuous operation to the greatest extent,VSC-based DC girds have extremely stringent requirements for transmission line relay *** terms of guaranteeing their reliability,accurate identification of lightning strikes on DC transmission lines is one of the urgent key problems to be *** effective ultra-high-speed identification scheme of lightning strikes suitable for the VSC-based DC grid is proposed in this ***,an 1-mode reverse voltage traveling wave(RVTW)is constructed applying the pole-mode transformation ***,fault traveling wave propagation characteristics along the DC transmission line are analyzed in depth utilizing Peterson's ***,differences of time-frequency electromagnetic transient characteristics of 1-mode RVTWs between disturbances and faults caused by lightning strikes are distinguished in detail by means of the classical wavelet transformation multi-resolution analysis ***,extensive simulations are carried out to evaluate the performance of the proposed identification scheme,and by which its excellent rapidity,reliability and robustness are *** Terms-Lightning-strike identification,Multi-resolution analysis,Relay protection,Traveling-wave protection,VsC-based DC grid,Wavelet transformation.

关键词： Lightning-strike identification Multi-resolution analysis Relay protection Traveling-wave protection VsC-based DC grid Wavelet transformation

Surface-modified Biphasic Calcium Phosphate/Poly (L-lactide) Biocomposite

维普期刊数据库评论

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 Wuhan University of Technology(Materials Science) 2009年第1期24卷 81-86页

作者：杨为中尹光福 College of Material Science and Engineering Sichuan University

Biphasic calcium phosphate （BCP） powders were prepared by hydrolyzation proc-ess and surface-modified by directly grafted L-lactide （LLA） onto the surface of BCP through a chemical linkage. The grafting ratio of organic groups was 9 wt%. After surface modification, the surface of BCP powders was covered by the lamella-shaped crystal. Poly （L-lactide） was mixed with BCP to form the BCP/PLLA biocomposite. Modified BCP （mBCP） particles could be uniformly dis-persed in PLLA matrix. The compressive strength of the mBCP/PLLA composite is 115 MPa, 28% higher than that of unmodified-BCP/PLLA composite. The improved mechanical strength is attributed to the enhanced adhesion between the inorganic BCP filler and the organic PLLA matrix.

关键词： biphasic calcium phosphate (BCP) surface modification grafting composite poly L-lactide

在线全文

学校读者我要写书评

暂无评论

DLC表面特异性吸附血浆蛋白的机理研究

稀有金属材料与工程 2007年第A2期36卷 61-64页

作者：李伯刚殷杰那娟娟尹光福四川大学材料科学与工程学院四川成都610065

为探讨类金刚石薄膜(DLC)与金刚石薄膜(DF)、石墨具有不同血浆蛋白吸附特性的内在原因,进行了人血白蛋白(HSA)和纤维蛋白原(HFG)在3种碳素材料表面吸附前后的红外光谱分析。结果显示:通过-NH基,在DLC与HAS之间及DF、石墨与HFG之间有氢... 详细信息

为探讨类金刚石薄膜(DLC)与金刚石薄膜(DF)、石墨具有不同血浆蛋白吸附特性的内在原因,进行了人血白蛋白(HSA)和纤维蛋白原(HFG)在3种碳素材料表面吸附前后的红外光谱分析。结果显示:通过-NH基,在DLC与HAS之间及DF、石墨与HFG之间有氢键形成。有力支持并合理解释了DLC具有较高的HSA吸附活性、DF和石墨则优先吸附HFG的前期研究结论。

关键词：类金刚石薄膜血液相容性蛋白吸附氢键