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Smart Gas Sensors: Recent Developments and Future Prospective

NANO-MICRO LETTERS 2025年第1期17卷 1-32页

作者： Zong, Boyang Wu, Shufang Yang, Yuehong Li, Qiuju Tao, Tian Mao, Shun Tongji Univ Biomed Multidisciplinary Innovat Res Inst Coll Environm Sci & Engn Shanghai East HospState Key Lab Pollut Control & 1239 Siping Rd Shanghai 200092 Peoples R China Shanghai Inst Pollut Control & Ecol Secur Shanghai 200092 Peoples R China Southern Med Univ Zhujiang Hosp Microbiome Med Ctr Dept Lab Med Guangzhou 510280 Peoples R China

Recent developments of advanced electronic and optoelectronic gas sensors are *** array with artificial intelligence algorithms and smart gas sensors in "Internet of Things" paradigm are *** of smart gas sensors in environmental monitoring, medical and healthcare applications, food quality control, and public safety are described. Gas sensor is an indispensable part of modern society with wide applications in environmental monitoring, healthcare, food industry, public safety, etc. With the development of sensor technology, wireless communication, smart monitoring terminal, cloud storage/computing technology, and artificial intelligence, smart gas sensors represent the future of gas sensing due to their merits of real-time multifunctional monitoring, early warning function, and intelligent and automated feature. Various electronic and optoelectronic gas sensors have been developed for high-performance smart gas analysis. With the development of smart terminals and the maturity of integrated technology, flexible and wearable gas sensors play an increasing role in gas analysis. This review highlights recent advances of smart gas sensors in diverse applications. The structural components and fundamental principles of electronic and optoelectronic gas sensors are described, and flexible and wearable gas sensor devices are highlighted. Moreover, sensor array with artificial intelligence algorithms and smart gas sensors in "Internet of Things" paradigm are introduced. Finally, the challenges and perspectives of smart gas sensors are discussed regarding the future need of gas sensors for smart city and healthy living.

关键词： Smart gas sensor Electronic sensor Optoelectronic sensor Flexible and wearable sensor Artificial intelligence

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Simulation study on transition mechanisms of microstructures during forming processes of amorphous metals

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中国有色金属学会会刊：英文版 2001年第1期11卷 35-39页

作者：郑采星刘让苏董科军彭平刘海蓉徐仲榆谢泉 Hunan Univ Dept Phys Changsha 410082 Peoples R China Hunan Univ Dept Chem Changsha 410082 Peoples R China Changsha Commun Inst Dept Basic Courses Changsha 410076 Peoples R China

For the first time, a molecular dynamics simulation study of 50000 atoms has been performed for the transition mechanisms of the microstructure configurations of liquid metal Al during forming processes of amorphous state by rapid cooling. Not only have various bond types been researched, but also icosahedra, defective icosahedra and Frank Kasper polyhedra cluster structures were discussed. A very clear picture of how the metal atoms gather to form clusters and how the clusters evolve further has been obtained. Some discussion corresponding to the microscopic mechanisms of the simulation results was also given. These will give an important enlightenment to understand the forming mechanisms and their microscopic processes of amorphous structures. [

关键词： amorphous metals microstructures transition mechanism computer simulation

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Coacervate Structures of CdI_2 Thin Film Grown during Phase Transformation

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Journal of Materials Science & Technology 1997年第4期13卷 296-298页

作者： Xiaoyan YE and Lili CAO(dept. of Chemistry, Tsinghua University, Beijing 100084, China)Jizhong ZHANG and Hengde LI(dept. of Materials Scieuce & Engineering, Tsinghua University, Beijing 100084, China) dept. of Chemistry Tsinghua University Beijing 100084 China dept. of Materials Science and Engineering Tsinghua University Beijing 100084 China

The microstructure of CdI2 thin film grown during vapor-phase deposition was investigated by scanning electron microscopy (SEM). The thin film deposited on Si crystal consists of numerous sunflower-like aggregates. These aggregates display well self-assembly characteristics. The size of Sunflower-like aggregates is between 12 and 44 μm. Each sunflower-like aggregate is surrounded with many adjacent wings-'petals'. The structure of central region of the 'sunflower' is obviously difFerent from that of the 'petal'. Electron spectroscopy for chemical analysis (ESCA) was employed in determining the chemical valence of the thin film. Self-organization efFect is used to explain the coring growth process of CdI2 thin film

关键词： Thin Coacervate Structures of CdI2 Thin Film Grown during Phase Transformation

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Influence of Experimental Parameters on Reactive Magnetron Sputtering CN_x Thin Films

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Journal of Materials Science & Technology 1997年第2期13卷 154-156页

作者： Zheng, WT Ding, T Ivanov, I Sundgren, JE JILIN UNIV DEPT MAT SCICHANGCHUN 130023PEOPLES R CHINA LINKOPING UNIV DEPT PHYSS-58183 LINKOPINGSWEDEN

Carbon nitride thin films were deposited on Si(001) using unbalanced magnetron sputtering at different experimental parameters. The effects of nitrogen partial pressure, substrate temperature and substrate bias on the... 详细信息

关键词： Carbon

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Microstructural Transitions during the Rapid Cooling Process of Liquid Metal Al

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Journal of Materials Science & Technology 1998年第5期14卷 461-464页

作者： Li, Jiyong Liu, Rangsu Xie, Quan Peng, Ping Zhou, Zheng Hunan Univ Dept Chem Changsha 410012 Peoples R China Hunan Univ Dept Phys Changsha 410012 Peoples R China

From a molecular-dynamics simulation study, it was demonstrated that the microscopic structure transitions is mainly determined by the changes of various microstructural configurations. There are two obvious phase transition points during the rapid cooling process. The first transition point is consistent with the well-known glass transition. The second one is a new weaker transition at low temperature. The cluster having 7-fold symmetry still exist in the supercooled liquid metal Al, though it occupies only 0.1% of the total number of clusters in the system and disappears below 550 K, namely, it can not exist in the glassy state. These results will give us a new way to understand the structural transition at microscopic level. (Edited author abstract) 15 Refs.

关键词： Aluminum

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Reinforcement learning for mobile robot:fromreaction to deliberation

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Journal of Systems Engineering and Electronics 2005年第3期16卷 611-617页

作者：陈春林陈宗海 dept .of Automation Univ .of Science and Technology of China

Reinforcement learning has been widely used for mobile robot learning and control. Some progress of this kind of appreaches is surveyed and argued in a new way which emphasizes on different levels of algorithms according to different complexity of tasks. The central conjecture is that approaches which combine reactive and deliberative control to robotics scale better to complex real-world applications than purely reactive or deliberative ones. This paper describes ha,sic reactive reinforcement learning algorithms and two classes of approaches to achieve deliberation, which are modular methods and hierarchical methods. By combining reactive and deliberative paradigms,the whole system gains advantages from different control levels. The paper gives results of experiments as a case study to verify the effectiveness of the proposed approaches.

关键词： reinforcement learning mobile robot reactive control deliberative control.

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Power allocation for MIMO-OFDM systems with multi-user decoupling and scheduling

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Journal of Systems Engineering and Electronics 2005年第3期16卷 715-720,F0003页

作者：段世平徐友云宋文涛 dept .of Electronic Engineering Shanghai Jiaotong Univ

A power allocation scheme for multi-user multiple-input multiple-output orthogonal frequency division multiplexing （MI- MO-OFDM） systems with channel state information （CSI） on transmitter and receiver is pressed. Multi-user lower allocation can be decoupled into single user lower allocation throughout null space mapping of multi-user channel and lower allocation can be performed throughout spatial-spectral water-filling for per *** deal with more users in system and fading correlation,scheduling is oerformed to maintain the gain of power *** proposed scheme can substantially improve system＇s spectral efficiency with low *** results validate the accuracy of theoretic analyses.

关键词： power allocation multi-user information theory radio resource management,MIMO,OFDM.

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SHAPE OF POLYMER CHAINS ON A TETRAHEDRAL LATTICE

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Chinese Journal of Polymer Science 2000年第5期18卷 419-422页

作者： Jian-hua Huang Me+ng-bo Luo Wen-hua Jiang Shi-jun Han Department of Chemistry, Zhejiang University, Hangzhou 310027, China Department of Physics, Zhejiang University, Hangzhou 310027, China Zhejiang Univ Dept Chem Hangzhou 310027 Peoples R China Zhejiang Univ Dept Phys Hangzhou 310027 Peoples R China

The shape of unperturbed polymer chains was studied using the Monte Carlo technique on a tetrahedral lattice. The asphericity A, the ratios / and / were calculated for different Values of polymer chain length n, conformational energy epsilon (epsilon greater than or equal to 0) and temperature T. The asphericity A decreases with the increase of chain length and tends to reach its limiting value rapidly with the decrease of gamma (gamma = epsilon/k(B)T). For large n, A is about 0.525 +/- 0.005, the ratios / and / are about 2.7 and 12.0, respectively, and are almost independent of gamma, but for short chains, they depend on gamma.

关键词： shape polymer chain Monte Carlo technique

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SYNTHESIS AND CHARACTERIZATION OF LIQUID CRYSTAL POLYMERS WITH T-SHAPED TWO-DIMENSIONAL MESOGENIC UNITS (Ⅱ)

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Chinese Journal of Polymer Science 1997年第1期15卷 65-73页

作者：李自法郑世军张淑媛曹少魁李磊刘广胜周其凤 Mater. Eng. dept. Zhengzhou Univ. Zhengzhou 450052 Chem. dept. Peking Univ. Beijing 100871

A series of liquid crystalline polymers with T-shaped two-dimensional mesogenic unitswere synthesized via low temperature solution polycondensation of 2-(4'-alkoxy-phenyl)hydroquinone with various diacyl dichlorides. The polymers were found to be nematic andshown thermotropic liquid crystalline behaviors through observations using DSC, polarizedmicroscopy and X-ray diffraction. The melting temperature T_m and the isotropizationtemperature T_i of the polymers change regularly with varying of the monomer structures.

关键词： T-shaped two-dimensional mesogenic units Liquid crystal polymer Polymer synthesis

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Friction assisted solid state lap seam welding and additive manufacturing method

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Defence Technology（防务技术） 2016年第1期12卷 16-24页

作者： Prasad Rao KALVALA Javed AKRAM Mano MISRA dept. of Metallurgical Engineering University of Utah

This paper describes results of seam welding of relatively high temperature melting materials, AISI 304, C-Mn steels, Ni-based alloys, CP Cu, CP Ni, Ti6Al4V and relatively low temperature melting material, AA6061. It describes the seam welding of multi-layered similar and dissimilar metallic sheets. The method described and involved advancing a rotating non-consumable rod(CP Mo or AISI 304) toward the upper sheet of a metallic stack clamped under pressure. As soon as the distal end of the rod touched the top portion of the upper metallic sheet, an axial force was applied. After an initial dwell time, the metallic stack moved horizontally relative to the stationery non-consumable rod by a desired length, thereby forming a metallurgical bond between the metallic sheets. Multi-track and multi-metal seam welds of high temperature metallic sheets, AISI 304, C-Mn steel,Nickel-based alloys, Cp Cu, Ti6Al4V and low temperature metallic sheets, AA6061 were obtained. Optical and scanning electron microscopy examination and 180 degree U-bend test indicated that defect free seam welds could be obtained with this method. Tensile- shear testing showed that the seam welds of AISI 304, C-Mn steel, Nickel-based alloy were stronger than the starting base metal counterparts while AA6061 was weaker due to softening. The metallurgical bonding at the interface between the metallic sheets was attributed to localized stick and slip at the interface, dynamic recrystallization and diffusion. The method developed can be used as a means of welding, cladding and additive manufacturing.

关键词： Lap seam welding Friction assisted welding Solid-state welding Cladding Additive manufacturing

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