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基于预连接镍链的高应变敏感度动态可调电磁干扰屏蔽弹性体

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science China Materials 2024年第2期67卷 629-641页

作者：卞敬周兴成周翔马林峰朱先军李建民刘淑娟赵强 College of Electronic and Optical engineering&College of Flexible Electronics(Future Technology) National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly TechnologyNanjing University of Posts and TelecommunicationsNanjing 210023China State Key Laboratory of Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Nanjing University of Posts&TelecommunicationsNanjing 210023China

具有动态可调电磁屏蔽性能的电磁干扰屏蔽材料备受关注,但其目前仍然存在制备复杂、厚度大、触发方式不便、调节范围窄等缺点.我们通过将尖刺镍微粒精确地分散到聚二甲基硅氧烷基体中形成预连接的链状结构,制备出了具有可开关电磁屏蔽... 详细信息

具有动态可调电磁屏蔽性能的电磁干扰屏蔽材料备受关注,但其目前仍然存在制备复杂、厚度大、触发方式不便、调节范围窄等缺点.我们通过将尖刺镍微粒精确地分散到聚二甲基硅氧烷基体中形成预连接的链状结构,制备出了具有可开关电磁屏蔽性能的弹性体材料.弹性体在机械拉伸和释放过程中表现出连续和可逆的电磁干扰屏蔽性能.原始弹性体具有良好的阻抗匹配和低介电损耗,允许大部分电磁波通过.拉伸使预连接的短链彼此接触,在内部形成大量的微尺度导电网络,显著增强了电导损耗能力,实现了较强的电磁干扰屏蔽能力.此外,我们通过无线应变传感系统验证了智能电磁干扰屏蔽弹性体的应用潜力,证明了可穿戴智能电磁干扰屏蔽精确监测人体运动的可能性.

关键词： adjustable electromagnetic interference shielding conductive elastomer electromagnetic sensing negative piezoresistivity

Recent advances in zwitterionic nanoscale drug delivery systems to overcome biological barriers

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Asian Journal of Pharmaceutical sciences 2024年第1期19卷 49-68页

作者： Xumei Ouyang Yu Liu Ke Zheng Zhiqing Pang Shaojun Peng Zhuhai Institute of Translational Medicine Zhuhai Precision Medical CenterZhuhai People’s Hospital(Zhuhai Hospital Affiliated with Jinan University)Zhuhai 519000China Key Laboratory of Smart Drug Delivery Ministry of EducationDepartment of PharmaceuticsSchool of PharmacyFudan UniversityShanghai 201203China School of Materials science and engineering Dongguan University of TechnologyDongguan 523808China

nanoscale drug delivery systems(nDDS)have been employed widely in enhancing the therapeutic efficacy of drugs against diseases with reduced side *** several nDDS have been successfully approved for clinical use up to now,biological barriers between the administration site and the target site hinder the wider clinical adoption of nDDS in disease *** glycol(PEG)-modification(or PEGylation)has been regarded as the gold standard for stabilising nDDS in complex biological ***,the accelerated blood clearance(ABC)of PEGylated nDDS after repeated injections becomes great challenges for their clinical *** polymer,a novel family of antifouling materials,have evolved as an alternative to PEG due to their super-hydrophilicity and *** nDDS could avoid the generation of ABC phenomenon and exhibit longer blood circulation time than the PEGylated *** impressively,zwitterionic nDDS have recently been shown to overcome multiple biological barriers such as nonspecific organ distribution,pressure gradients,impermeable cell membranes and lysosomal degradation without the need of any complex chemical *** realization of overcoming multiple biological barriers by zwitterionic nDDS may simplify the current overly complex design of nDDS,which could facilitate their better clinical ***,we summarise the recent progress of zwitterionic nDDS at overcoming various biological barriers and analyse their ***,prospects and challenges are introduced to guide the rational design of zwitterionic nDDS for disease treatment.

关键词： Zwitterionic polymer nano drug delivery system Biological barrier Targeting delivery Disease treatment

Jellyfish-inspired alginate composite hydrogel filter prepared by macro-micro double bionic strategy for efficient water purification

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Frontiers of Environmental science & engineering 2024年第4期18卷 141-157页

作者： Huiting Peng Yan Chen Jiaopan Lin Chelsea Benally Mohamed Gamal El-Din Junkai Gao School of Naval Architecture and Marinetime Zhejiang Ocean UniversityZhoushan 316022China department of Civil and Environmental engineering University of AlbertaEdmontonAB T6G 1H9Canada

Recently,research on hydrogel materials with a porous structure and superior water absorption capabilities significantly ***,the hydrogel under gravity-driven separation conditions often exhibit an unstable pore structure,poor mechanical properties,and limited *** this end,this work presents a novel approach that combines a macro-micro double bionic strategy with a triple crosslinking method to develop a multifunctional alginate composite hydrogel filter(2%-SA-κCG-PVA-Ca^(2+),2%-SKP-Ca^(2+)for short)with a stable pore structure and superior mechanical properties,which possessed an umbrella-shaped structure resembling that of *** 2%-SKPCa^(2+)filter was synthesized using polyvinyl alcohol(PVA)as a stable structure-directing agent,and sodium alginate(SA)andκ-carrageenan(κ-CG)as polymer *** distinctive umbrellashaped hydrogel of 2%-SKP-Ca^(2+)filter,formed through the triple crosslinking method,overcomes the limitations of unstable pore structure and poor durability seen in hydrogels prepared by traditional crosslinking ***,the utilization of the 2%-SKP-Ca^(2+)filter in water treatment demonstrates its good selective permeability,excellent resistance to fouling,and extended longevity,which enables it to simultaneously achieve the multifunctional water purification and the coating of multi-substrate anti-fouling ***,not only does this research provide an efficient,multifunctional,highly pollution-resistant preparation method for designing a new filter,but it also confirms the application prospect of the macro-micro dual bionic strategy developed in this study in complex water treatment.

关键词： Triple crosslinking method Alginate Umbrella-shaped Jellyfish Water purification

Design and Analysis of Power and Transmission System of Downhole Pure Electric Command Vehicle

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Journal of Transportation Technologies 2024年第1期14卷 31-52页

作者： Md Jahangir Alam Md Shahriar Sujan Md. Al Imran Tapu Joy Howlader College of Civil and Transportation engineering Hohai University Nanjing China College of Harbor Coastal & Offshore engineering Hohai University Nanjing China department of Computer science and Technology College of Computer and Information Hohai University Nanjing China

Electric vehicles use electric motors, which turn electrical energy into mechanical energy. As electric motors are conventionally used in all the industry, it is an established development site. It’s a mature technology with ideal power and torque curves for vehicular operation. Conventional vehicles use oil and gas as fuel or energy storage. Although they also have an excellent economic impact, the continuous use of oil and gas threatened the world’s reservation of total oil and gas. Also, they emit carbon dioxide and some toxic ingredients through the vehicle’s tailpipe, which causes the greenhouse effect and seriously impacts the environment. So, as an alternative, electric car refers to a green technology of decarbonization with zero emission of greenhouse gases through the tailpipe. So, they can remove the problem of greenhouse gas emissions and solve the world’s remaining non-renewable energy storage problem. Pure electric vehicles (PEV) can be applied in all spheres, but their special implementation can only be seen in downhole operations. They are used for low noise and less pollution in the downhole process. In this study, the basic structure of the pure electric command vehicle is studied, the main components of the command vehicle power system, namely the selection of the drive motor and the power battery, are analyzed, and the main parameters of the drive motor and the power battery are designed and calculated. The checking calculation results show that the power and transmission system developed in this paper meets the design requirements, and the design scheme is feasible and reasonable.

关键词： Pure Electric Vehicles Transmission Gears Electronic Differential Control Algorithms

Sensitive Information Security Based on Elliptic Curves

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World Journal of engineering and Technology 2024年第2期12卷 274-285页

作者： Nadine Nibigira Vincent Havyarimana Zhu Xiao School of engineering sciences University of Burundi Doctoral School Bujumbura Burundi department of Applied sciences Burundi Higher Institute of Education (ENS) Bujumbura Burundi College of Computer science and Electronic engineering Hunan University Changsha China

The elliptic curve cryptography algorithm represents a major advancement in the field of computer security. This innovative algorithm uses elliptic curves to encrypt and secure data, providing an exceptional level of security while optimizing the efficiency of computer resources. This study focuses on how elliptic curves cryptography helps to protect sensitive data. Text is encrypted using the elliptic curve technique because it provides great security with a smaller key on devices with limited resources, such as mobile phones. The elliptic curves cryptography of this study is better than using a 256-bit RSA key. To achieve equivalent protection by using the elliptic curves cryptography, several Python libraries such as cryptography, pycryptodome, pyQt5, secp256k1, etc. were used. These technologies are used to develop a software based on elliptic curves. If built, the software helps to encrypt and decrypt data such as a text messages and it offers the authentication for the communication.

关键词： Cryptography Elliptic Curves Digital Security Data Sensitive Data Implementation

Ta_(2)NiSe_(5)/GaN范德华异质结用于具有超高响应性和耐恶劣环境的紫外光电探测器

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science China Materials 2024年第3期67卷 863-870页

作者：雷剑鹏郑涛吴望龙郑照强郑筌升王小周肖文波李京波杨孟孟 Jiangxi engineering Laboratory for Optoelectronics Testing Technology Nanchang Hangkong UniversityNanchang 330063China Guangdong Provincial Key Laboratory of Chip and Integration Technology School of Semiconductor Science and TechnologySouth China Normal UniversityFoshan 528225China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China department of Applied Physics School of Physics and ElectronicsHunan UniversityChangsha 410082China College of Optical science and engineering Zhejiang UniversityHangzhou 310027China

氮化镓由于其直接带隙、固有的紫外吸收和高击穿电压引起了人们对其在紫外光电探测领域的极大研究兴趣.在本工作中,我们成功地将新型三元硫族化合物Ta_(2)NiSe_(5)与非故意掺杂的GaN堆叠,形成了具有典型I型能带排列的混合维度的Ta_(2)Ni... 详细信息

氮化镓由于其直接带隙、固有的紫外吸收和高击穿电压引起了人们对其在紫外光电探测领域的极大研究兴趣.在本工作中,我们成功地将新型三元硫族化合物Ta_(2)NiSe_(5)与非故意掺杂的GaN堆叠,形成了具有典型I型能带排列的混合维度的Ta_(2)NiSe_(5)/GaN(2D/3D)范德瓦尔斯异质结构.该异质结构表现出优异的紫外探测性能(光开关比为10~7,响应度为1.22×10^(4)A W^(-1)).此外,在365 nm的光照和4 V的偏压下,探测度提高至1.3×10^(16)Jones,并表现出1.22/31.6 ms的快速响应速率.值得注意的是,该器件还具有优异的稳定性、可重复性和抗恶劣环境条件(包括高温和酸性条件)的耐受性.得益于光电探测器的高响应度、探测度和光开关比,我们成功地将该异质结构器件集成到紫外光通信中,证明了Ta_(2)NiSe_(5)/GaN光电探测器在信息传输中有着优异的应用前景.

关键词： GaN Ta_(2)NiSe_(5) heterojunction UV photodetector super-high responsivity harsh environment-resistant

Active and switchable thermal control

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science China(Physics,Mechanics & Astronomy) 2022年第11期65卷 80-81页

作者： Chenhan Liu Yunfei Chen micro-and nano-scale Thermal Measurement and Thermal Management Laboratory School of Energy and Mechanical EngineeringNanjing Normal UniversityNanjing210046China Jiangsu Key Laboratory for Numerical Simulation of Large-Scale Complex Systems Nanjing Normal UniversityNanjing210046China Jiangsu Key Laboratory for Design and Manufacture of micro-nano Biomedical Instruments School of Mechanical EngineeringSoutheast UniversityNanjing211100China

In the past century, actively controlling electron transport has led to unprecedented advances in the digital world. Controlling phonon(i.e., thermal) transport like electron transport is a current topic of interest. To realize active and switchable thermal control(Figure 1), numerous studies have been conducted recently due to the emerging challenges in the fields of thermal management, heating and refrigeration.

关键词： thermal transport Figure

A Novel Cable-Driven Soft Robot for Surgery

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Journal of Shanghai Jiaotong university(science) 2024年第1期29卷 60-72页

作者：李茹陈方俞文伟 IGARASH Tatsuo 舒雄鹏谢叻 Institute of Forming Technology and Equipment School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200030China The Sixth People's Hospital Affiliated to Shanghai Jiao Tong University Shanghai 200233China Center for Frontier Medical engineering Chiba UniversityChiba 263-8522Japan Seirei Sakura Citizen Hospital Chiba 285-8765Japan Institute of Medical Robotics Shanghai Jiao Tong UniversityShanghai 200030China School of Mathematics and Computer science Quanzhou Normal UniversityQuanzhou 362000FujianChina

Robot-assisted laparoscopic radical prostatectomy(RARP)is widely used to treat prostate *** rigid instruments primarily used in RARP cannot overcome the problem of blind areas in surgery and lead to more trauma such as more incision for the passage of the instrument and additional tissue damage caused by rigid *** robots are relatively fexible and theoretically have infinite degrees of freedom which can overcome the problem of the rigid instrument.A soft robot system for single-port transvesical robot-assisted radical prostatectomy(STvRARP)is developed in this *** soft manipulator with 10 mm in diameter and a maximum bending angle of 270°has good fexibility and *** design and mechanical structure of the soft robot are *** kinematics of the soft manipulator is established and the inverse kinematics is compensated based on the characteristics of the designed soft *** master-slave control system of soft robot for surgery is built and the feasibility of the designed soft robot is verified.

关键词： soft robot kinematics model robot-assisted surgery

Damage Characteristics Analysis and Fractal Study of Shale With Prefabricated Fractures under Thermal-mechanical Coupling

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Journal of Wuhan University of Technology(Materials science) 2024年第3期39卷 570-586页

作者：张辉邬忠虎 SONG Huailei WANG Wentao TANG Motian CUI Hengtao College of Civil engineering Guizhou UniversityGuiyang 550025China

To study the damage and failure of shale with different fracture inclination angles under uniaxial compression loading,in this work,RFPA2D-Thermal,a two-dimensional real failure process analysis software,was used for numerical *** simulation results show that quartz in shale mainly affects the tensile and compressive strength of shale by increasing rock *** coupling of temperature and pressure will cause lateral and volume destruction of shale,which enables the shale body to be more easily *** inclination is the key factor affecting shale damage *** failure mode of shale with low-and high-angle fractures is mainly shear failure,and the compressive strength does not vary with crack *** damage mode of obliquely intersecting fractured shale is slip damage along the fracture face,the compressive strength decreases and then increases with the fracture inclination,and a minimum value *** acoustic emission simulation results of the damage process effectively reflect the accumulated internal damage and macroscopic crack appearance until fracture instability when the prefabricated fractured shale is subjected to uniaxial compressive *** crack inclinations of 0°and 120℃ corresponds to the most complex"N"shape damage *** crack inclinations of 30°and 60°,and the damage mode is an inverted"λ"shape.

关键词： shale temperature and pressure numerical simulation fracture dip angle fractal dimension