检索结果-南通市图书馆

Advances in the Development of Gradient Scaffolds Made of Nano-Micromaterials for Musculoskeletal Tissue Regeneration

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 2025年第1期17卷 1-46页

作者： Fang, Lei Lin, Xiaoqi Xu, Ruian Liu, Lu Zhang, Yu Tian, feng Li, jiao jiao Xue, Jiajia Beijing Univ Chem Technol Beijing Lab Biomed Mat Beijing 100029 Peoples R China Beijing Univ Chem Technol State Key Lab Organ Inorgan Composites Beijing 100029 Peoples R China Univ Technol Sydney Fac Engn & IT Sch Biomed Engn Sydney NSW 2007 Australia

This review highlights the gradient variations in the structural composition of musculoskeletal tissues and comprehensively examines recent progress in the fabrication and application of biomimetic gradient scaffolds for musculoskeletal *** challenges and prospects of gradient scaffolds for clinical application are discussed. The intricate hierarchical structure of musculoskeletal tissues, including bone and interface tissues, necessitates the use of complex scaffold designs and material structures to serve as tissue-engineered substitutes. This has led to growing interest in the development of gradient bone scaffolds with hierarchical structures mimicking the extracellular matrix of native tissues to achieve improved therapeutic outcomes. Building on the anatomical characteristics of bone and interfacial tissues, this review provides a summary of current strategies used to design and fabricate biomimetic gradient scaffolds for repairing musculoskeletal tissues, specifically focusing on methods used to construct compositional and structural gradients within the scaffolds. The latest applications of gradient scaffolds for the regeneration of bone, osteochondral, and tendon-to-bone interfaces are presented. Furthermore, the current progress of testing gradient scaffolds in physiologically relevant animal models of skeletal repair is discussed, as well as the challenges and prospects of moving these scaffolds into clinical application for treating musculoskeletal injuries.

关键词： Gradient scaffolds Musculoskeletal tissues Advanced manufacturing Biomaterials Tissue regeneration

How to apply polar codes in high throughput space communications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2020年第8期63卷 1371-1382页

作者： feng BoWen jiao jian WU ShaoHua ZHANG QinYu Communication Engineering Research Center Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

This paper describes how to apply polar codes in high-throughput space *** high throughput space communications can enable terabit data rate capacity wideband wireless transmissions,and offer service availability of anywhere and *** paper investigates the channel characteristics in space *** channels are lossy,time-varying,intermittent,long-latency,and with imperfect channel state information(CSI).In order to make the polar codes suitable for the space channel,some improvements and designs on the polar codes are provided in this *** encoding and decoding methods of polar codes are discussed,which are the key to determine the *** describe some rateless polar coding schemes that can guide the construction of suitable codes for time-varying channels with no-CSI in long-haul ***,a high-rate parallel concatenation scheme of polar codes is introduced,which can improve the anti-interrupt ability of polar ***,in order to support the massive connectivity requirements of future space communication networks,polar-coded sparse-code-multiple-access(SCMA)schemes are investigated.

关键词： space communications polar code concatenated coding high throughput

Recent Advances in Fibrous Materials for Hydroelectricity Generation

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 109-133页

作者： Can Ge Duo Xu Xiao feng Xing Yang Zheheng Song Yuhang Song Jingyu Chen Yingcun Liu Chong Gao Yong Du Zhe Sun Weilin Xu jian Fang College of Textile and Clothing Engineering Soochow UniversitySuzhou 215123People’s Republic of China National Engineering Laboratory for Modern Silk Soochow UniversitySuzhou 215123People’s Republic of China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200People’s Republic of China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123People’s Republic of China Department of Electrical and Computer Engineering University of MassachusettsAmherstMA 01003USA Department of Materials Imperial College LondonSouth Kensington CampusLondon SW72AZUK College of Textile Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310018People’s Republic of China School of Materials Science and Engineering Shanghai Institute of Technology100 Haiquan RoadShanghai 201418People’s Republic of China

Depleting fossil energy sources and conventional polluting power generation pose a threat to sustainable *** generation from ubiquitous and spontaneous phase transitions between liquid and gaseous water has been considered a promising strategy for mitigating the energy *** materials with unique flexibility,processability,multifunctionality,and practicability have been widely applied for fibrous materials-based hydroelectricity generation(FHG).In this review,the power generation mechanisms,design principles,and electricity enhancement factors of FHG are first ***,the fabrication strategies and characteristics of varied constructions including 1D fiber,1D yarn,2D fabric,2D membrane,3D fibrous framework,and 3D fibrous gel are ***,the advanced functions of FHG during water harvesting,proton dissociation,ion separation,and charge accumulation processes are analyzed in ***,the potential applications including power supply,energy storage,electrical sensor,and information expression are also ***,some existing challenges are considered and prospects for future development are sincerely proposed.

关键词： Hydroelectricity Fibrous material Streaming potential Ion diffusion

基于尺寸效应的钛合金二维超声辅助精密切削特性研究

在线全文

学校读者我要写书评

暂无评论

河南理工大学学报（自然科学版） 2025年第1期44卷 117-123页

作者：王鑫刘建慧焦锋新乡航空工业(集团)有限公司河南新乡453000 河南理工大学机械与动力工程学院河南焦作454000

目的为了减少尺寸效应对精密加工的影响,提高钛合金微尺度切削的加工精度与表面质量,方法将特种加工理论和精密切削方法相结合,提出二维超声辅助精密切削方法。首先,基于ABAQUS力-热耦合模型分析二维超声辅助精密切削钛合金的切削过程,... 详细信息

目的为了减少尺寸效应对精密加工的影响,提高钛合金微尺度切削的加工精度与表面质量,方法将特种加工理论和精密切削方法相结合,提出二维超声辅助精密切削方法。首先,基于ABAQUS力-热耦合模型分析二维超声辅助精密切削钛合金的切削过程,探究精密切削与二维超声辅助精密切削的切削力学特性;其次,通过试验以超声振幅、切削深度与刃口半径的比值(a_(p)/r_(n))为因素,分析尺寸效应作用下超声振动切削中切削力及单位切削力的变化规律;最后,对比分析精密切削与二维超声辅助精密切削在不同切削深度与刃口半径的比值(a_(p)/r_(n))下的表面形貌特征。结果结果表明,随着切削深度与刃口半径的比值(a_(p)/r_(n))增大,精密切削钛合金表面形貌出现黏结、凹坑、耕犁现象,而二维超声辅助精密切削加工表面则出现均匀、完整的网状表面纹理特征。另外,二维超声辅助精密切削加工单位切削力远小于精密切削加工的,且随着振幅增大,单位切削力的增长比值由57.7%降至45.2%。结论二维超声辅助精密切削能够显著改善尺寸效应中产生的负前角效应和犁切现象,降低单位切削力,提高切削过程的稳定性,在提高钛合金微尺度切屑加工精度和表面质量方面具有重要应用价值。

关键词：二维超声辅助切削尺寸效应刃口半径切削力

Formation mechanism of the protective layer in a blast furnace hearth

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2015年第10期22卷 1017-1024页

作者： Ke-xin jiao jian-liang Zhang Zheng-jian Liu Meng Xu feng Liu School of Metallurgical and Ecological Engineering University of Science and Technology Beijing State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Shougang Research Institute of Technology

A variety of techniques, such as chemical analysis, scanning electron microscopy-energy dispersive spectroscopy, and X-ray diffraction, were applied to characterize the adhesion protective layer formed below the blast furnace taphole level when a certain amount of titanium-bearing burden was used. Samples of the protective layer were extracted to identify the chemical composition, phase assemblage, andistribution. Furthermore, the formation mechanism of the protective layer was determined after clarifying the source of each componenFinally, a technical strategy was proposed for achieving a stable protective layer in the hearth. The results show that the protective layemainly exists in a bilayer form in the sidewall, namely, a titanium-bearing layer and a graphite layer. Both the layers contain the slag phaswhose major crystalline phase is magnesium melilite（Ca2Mg Si2O7） and the main source of the slag phase is coke ash. It is clearly determinethat solid particles such as graphite, Ti（C,N） and Mg Al2O4play an important role in the formation of the protective layer, and the key factofor promoting the formation of a stable protective layer is reasonable control of the evolution behavior of coke.

关键词： blast furnaces hearths protective layers electroch

Formation mechanism of the graphite-rich protective layer in blast furnace hearths

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2016年第1期23卷 16-24页

作者： Ke-xin jiao jian-liang Zhang Zheng-jian Liu feng Liu Li-sheng Liang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Beijing 100083 China Baoshan Iron & Steel Co. Ltd. Shanghai 200941 China

A long campaign life of blast furnaces is heavily linked to the existence of a protective layer in their hearths. In this work, we conducted dissection studies and investigated damage in blast furnace hearths to estimate the formation mechanism of the protective layer. The results illustrate that a significant amount of graphite phase was trapped within the hearth protective layer. Furthermore, on the basis of the thermodynamic and kinetic calculations of the graphite precipitation process, a precipitation potential index related to the formation of the graphite-rich protective layer was proposed to characterize the formation ability of this layer. We determined that, under normal operating conditions, the precipitation of graphite phase ~om hot metal was thermodynamically possible. Among elements that exist in hot metal, C, Si, and P favor graphite precipitation, whereas Mn and Cr inhibit this process. Moreover, at the same hot-face temperature, an increase of carbon concentration in hot metal can shorten the precipitation time. Finally, the results suggest that measures such as reducing the hot-face tem- perature and increasing the degree of carbon saturation in hot metal are critically important to improve the precipitation potential index.

关键词： blast furnaces hearths graphite protective layers formation mechanisms

Classification of Arrhythmia Based on Convolutional Neural Networks and Encoder-Decoder Model

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第10期73卷 265-278页

作者： jian Liu Xiaodong Xia Chunyang Han jiao Hui Jim feng School of Computer&Communication Engineering University of Science and Technology BeijingBeijing100083China Beijing Satellite Navigation Center Beijing100093China The Institute of NBC Defense Chinese PLA ArmyBeijing102205China Amphenol Global Interconnect Systems San JoseCA 95131US

As a common and high-risk type of disease,heart disease seriously threatens people’s *** the same time,in the era of the Internet of Thing(IoT),smart medical device has strong practical significance for medical workers and patients because of its ability to assist in the diagnosis of ***,the research of real-time diagnosis and classification algorithms for arrhythmia can help to improve the diagnostic efficiency of *** this paper,we design an automatic arrhythmia classification algorithm model based on Convolutional Neural Network(CNN)and Encoder-Decoder *** model uses Long Short-Term Memory(LSTM)to consider the influence of time series features on classification ***,it is trained and tested by the MIT-BIH arrhythmia ***,Generative Adversarial Networks(GAN)is adopted as a method of data equalization for solving data imbalance *** simulation results show that for the inter-patient arrhythmia classification,the hybrid model combining CNN and Encoder-Decoder model has the best classification accuracy,of which the accuracy can reach 94.05%.Especially,it has a better advantage for the classification effect of supraventricular ectopic beats(class S)and fusion beats(class F).

关键词： Electroencephalography convolutional neural network long short-term memory encoder-decoder model generative adversarial network

Buckling Properties of Water-Drop-Shaped Pressure Hulls with Various Shape Indices Under Hydrostatic External Pressure

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Ocean Engineering 2024年第1期38卷 1-17页

作者： DING Xiao-de ZHANG jian WANG Fang jiao Hui-feng WANG Ming-lu School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Shanghai Engineering Research Center of Marine Renewable Energy College of Engineering Science and Technol-ogyShanghai Ocean UniversityShanghai 201306China China Ship Scientific Research Center Wuxi 214082China

The water-drop-shaped pressure hull has a good streamline,which has good application prospect in the underwater ***,this study conducted analytical,experimental and numerical investigation of the buckling properties of water-drop-shaped pressure hulls under hydrostatic pressure.A water-drop experiment was conducted to design water-drop-shaped pressure hulls with various shape *** critical loads for the water-drop-shaped pressure hulls were resolved by using Mushtari’s *** numerical simulations including linear buckling analysis and nonlinear buckling analysis including eigenmode imperfections were *** results indicated that the critical loads resolved by Mushtari's formula were in good agreement with the linear buckling loads from the numerical *** formula can be extended to estimate the buckling capacity of water-drop-shaped pressure *** addition,three groups of pressure hulls were fabricated by using stereolithography,a rapid prototyping ***,three groups of the pressure hulls were subjected to ultrasonic measurements,optical scanning,hydrostatic testing and numerical *** experimental results were consistent with the numerical *** results indicate that the sharp end of the water-drop-shaped pressure hulls exhibited instability compared with the blunt *** paper provides a new solution to the limitations of experimental studies on the water-drop-shaped pressure hulls as well as a new configuration and evaluation method for underwater observatories.

关键词： buckling pressure hull water drop underwater observatory

Biomechanics in plant resistance to drought

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2020年第5期36卷 1142-1157,I0004页

作者： Shaobao Liu Han Liu jiaojiao jiao Jun Yin Tian jian Lu feng Xu State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Nanjing Center for Multifunctional Lightweight Materials and Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China MOE Key Laboratory of Biomedical Information Engineering School of Life Science and TechnologyXi'an Jiaotong UniversityXi’an 710049China Bioinspired Engineering and Biomechanics Center(BEBC) Xi'an Jiaotong UniversityXi'an 710049China

During drought,plant functions at multi-levels(i.e.,tissue,.cellular and molecular)are adjustable with the change of water condition,which is known as drought *** biological,chemical and physical mechanisms have been found in plant drought resistance,among which the role of physical cues(especially mechanics)has attracted significantly increasing *** studies have shown that mechanics is one of the fundamental factors that control the responses and self-adaptation from tissue to molecular levels in plant when the external conditions *** the review,we examine how the factor of mechanics acts on the multi-level plant functions under drought stress,including water transport,tissue deformation,cell growth,cell movements,molecules interaction and signal pathway.

关键词： Water transport Deformation Molecule interaction Multi-level Self-adaptation