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Diphylleia Grayi-Inspired Intelligent temperature-Responsive Transparent Nanofiber Membranes

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Nano-Micro Letters 2024年第4期16卷 67-78页

作者： Cengceng Zhao Gaohui Liu Yanyan Lin Xueqin Li Na Meng Xianfeng Wang Shaoju Fu Jianyong Yu Bin Ding Shanghai Frontier Science Research Center of Advanced Textiles College of TextilesDonghua UniversityShanghai 201620People’s Republic of China

Nanofiber membranes(NFMs) have become attractive candidates for next-generation flexible transparent materials due to their exceptional flexibility and breathability. However, improving the transmittance of NFMs is a great challenge due to the enormous reflection and incredibly poor transmission generated by the nanofiber-air interface. In this research, we report a general strategy for the preparation of flexible temperature-responsive transparent(TRT) membranes,which achieves a rapid transformation of NFMs from opaque to highly transparent under a narrow temperature window. In this process, the phase change material eicosane is coated on the surface of the polyurethane nanofibers by electrospray technology. When the temperature rises to 37 ℃, eicosane rapidly completes the phase transition and establishes the light transmission path between the nanofibers, preventing light loss from reflection at the nanofiber-air interface. The resulting TRT membrane exhibits high transmittance(> 90%), and fast response(5 s). This study achieves the first TRT transition of NFMs, offering a general strategy for building highly transparent nanofiber materials, shaping the future of next-generation intelligent temperature monitoring, anti-counterfeiting measures, and other high-performance devices.

关键词： Biomimetic Transparent Nanofibrous membrane temperature response Phase change materials

INFLUENCE OF temperature-DEPENDENT PROPERTIES ON temperature response AND OPTIMUM DESIGN OF C/M FGMS UNDER THERMAL CYCLIC LOADING

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Journal of Wuhan University of Technology(Materials Science) 1997年第3期12卷 19-25页

作者：翟鹏程 Wuhan University of Technology China State Key Lab. Mater Synth./Proc. Wuhan Univ. of Tech. Wuhan 430070 China

The influence of temperature-dependent properties on temperature response and optimum design of newly developed ceramic-metal functionally graded materials under cyclic thermal loading and high temperature gradient environment is studied. The thermal conductivity of the material is considered to be dependent on the temperature. In this paper, the temperature response of the material is calculated using a nonlinear finite element method. Emphasis is placed on the influence of temperatue-dependent properties on the thermal response and insulation property of the material render the different graded compositional distributions and different heat flux magnitudes. Through the analysis, it is suggested that the influence of temperature-dependent properties can not be neglected in the temperature response analysis and the optimum design process of the material must be based on the temperature-dependent temperature analysis theory.

关键词： functionally graded materials temperature-dependent properties cyclic thermal load temperature response

Site preference and the optical thermometry strategy by different temperature response from two sites environment of Mn2+ in K7ZnSc2B15O30

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Site preference and the optical thermometry strategy by diff...

temperature and structural responses of a single-section utility tunnel throughout fire exposure

中国稀土学会2021学术年会

作者： Ying Fu Chao Li Feng Zhang Shixiang Huang Zhangyue Wu Yuhua Wang Zhengzheng Zhang Key Lab of Photovoltaic Materials of Henan Province Henan University National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology Lanzhou University

A novel optical thermometry strategy based on different temperature response from two sites environment of Mnin KZnScBO:Mnhad been reported.The color tunable Mndoped KZnScBO luminescence materials were successfully prepared,and the photoluminescence properties were studied.Using density functional theory,the electronic structure was estimated.The calculated result showed that KZnScBO was a direct-band gap material with the energy gap of 4.22 eV.Upon the excitation of UV light,the photoluminescence spectra of KZnScBO:Mnphosphors demonstrated two emission bands centered at 584 nm and 675 nm attributed to the substitution of Znand Scsites with Mnrespectively.Depending on the concentration of Mn,the emitting color can be tunable from yellow to red in the Mndoped single-phase phosphors.The temperature-dependent luminescence properties of KZnScBO:Mnwas anlysized range from 300 to 520 K.The results indicated that the thermal quenching properties of Mnat the two kinds of lattice sites are different.When Mnoccupied the position of Sc,the luminescence intensity decreased significantly with the increasing of temperature,on the contrary,when Mnoccupied the position of Zn,the luminescence intensity decreased slightly with the rise of temperature.This situation caused a significant change in the fluorescence intensity ratio of the two emission bands.Further study showed that the typical phosphor had a high relative and absolute sensitivity respectively with maximum value of 1.84%K and 0.0311 K at 520 K,and the temperature resolution is about 0.8 K.These results indicated that the single Mndoped KZnScBO materials showed a potential application for optical thermometry.

关键词： site preference photoluminescence properties multiband emission temperature response optical thermometry

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Frontiers of Structural and Civil Engineering 2022年第10期16卷 1351-1364页

作者： Yanmin YANG Ying XIONG Yongqing LI Xiangkun MENG Peng WANG Tianyuan CAI School of Civil Engineering Jilin Jianzhu UniversityChangchun 130118China Institute of Water Conservancy and Planning Research Changchun 130000China

In this study,fire tests of four single-section scaled-down utility tunnels were conducted.By analyzing temperature and structural responses of the utility tunnel throughout the fire exposure,the effects on the fire behavior of two different construction methods,cast-in-situ and prefabricated,and of two different materials,ordinary concrete and full lightweight concrete,were explored.The results of the study showed that the shear failure of the cast-in-situ utility tunnel occurred at the end of the top or bottom plate,and the failure of the prefabricated utility tunnel occurred at the junction of the prefabricated member and post-cast concrete.As the temperature increased,the temperature gradient along the thickness direction of the tunnel became apparent.The maximum temperature difference between the inner and outer wall surfaces was 531.7°C.The highest temperature occurred in the cooling stage after stopping the heating,which provided a reference for the fire protection design and rescue of the utility tunnel.The displacement of the top plate of the prefabricated utility tunnel was 16.8 mm,which was 41.8%larger than that of the cast-in-situ utility tunnel.The bearing capacities of the ordinary concrete utility tunnel and full lightweight concrete utility tunnel after the fire loss were 27%and 16.8%,respectively.The full lightweight concrete utility tunnel exhibited good ductility and fire resistance and high collapse resistance.

关键词： full lightweight concrete construction methods temperature response structural response fire test

temperature Modulates Tissue-Specification Program to Control Fruit Dehiscence in Brassicaceae

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Molecular Plant 2018年第4期11卷 598-606页

作者： Xin-Ran Li Joyita Deb S. Vinod Kumar Lars Фstergaard John Innes Centre Norwich Research Park Norwich NR4 7UH UK

Plants respond to diurnal and seasonal changes in temperature by reprogramming vital developmental pathways. Understanding the molecular mechanisms that define environmental modulation of plant growth and reproduction is critical in the context of climate change that threatens crop yield worldwide. Here, we report that elevated temperature accelerates fruit dehiscence in members of the Brassicaceae family including the model plant Arabidopsis thaliana and important crop species. Arabidopsis fruit development is controlled by a network of interacting regulatory genes. Among them, the INDEHISCENT （IND） gene is a key regulator of the valve-margin tissue that mediates fruit opening, hence facilitating fruit dehiscence. We demonstrated that the valve-margin development is accelerated at higher temperature and that IND is tar- geted for thermosensory control. Our results reveal that IND upregulation is facilitated via temperature- induced chromatin dynamics leading to accelerated valve-margin specification and dispersal of the seed. Specifically, we show that temperature-induced changes in IND expression are associated with ther- mosensory H2A.Z nucleosome dynamics. These findings establish a molecular framework connecting tis- sue identity with thermal sensing and set out directions for the production of temperature-resilient crops.

关键词： Brassicaceae seed dispersal fruit dehiscence temperature response gene regulation nucleosomedynamics

Thermal behavior of materials in laser-assisted extreme manufacturing:Raman-based novel characterization

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International Journal of Extreme Manufacturing 2020年第3期2卷 86-102页

作者： Ridong Wang Shen Xu Yanan Yue Xinwei Wang State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin 300072People's Republic of China School of Mechanical and Automotive Engineering Shanghai University of Engineering ScienceShanghai 201620People's Republic of China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072People's Republic of China Department of Mechanical Engineering Iowa State UniversityAmesIA 50011United States of America

Laser-assisted manufacturing(LAM)is a technique that performs machining of materials using a laser heating process.During the process,temperatures can rise above over 2000°C.As a result,it is crucial to explore the thermal behavior of materials under such high temperatures to understand the physics behind LAM and provide feedback for manufacturing optimization.Raman spectroscopy,which is widely used for structure characterization,can provide a novel way to measure temperature during LAM.In this review,we discuss the mechanism of Raman-based temperature probing,its calibration,and sources of uncertainty/error,and how to control them.We critically review the Raman-based temperature measurement considering the spatial resolution under near-field optical heating and surface structure-induced asymmetries.As another critical aspect of Raman-based temperature measurement,temporal resolution is also reviewed to cover various ways of realizing ultrafast thermal probing.We conclude with a detailed outlook on Raman-based temperature probing in LAM and issues that need special attention.

关键词： Raman spectroscopy temperature response spatial resolution temporal resolution ultrafast characterization

THE ROLE PLAYED BY THE STRATOSPHERE IN GREENHOUSE EFFECT

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Acta meteorologica Sinica 1993年第1期7卷 50-60页

作者：郭彩丽李维亮刘煜 Chinese Academy of Meteorological Sciences Beijing 100081

Two one-dimensional radiative-convective models with the same scheme and the different ranges that one is from surface to stratopause and the other is from surface to tropopause,have been developed to study the role played by the stratosphere in greenhouse effect.It is shown that the addition of stratospheric response may lead to an increase of 7—50 percent in radiative forcing at the tropopause,and an increase of 20—60 percent in surface temperature when the con- centration of the same gas in the two models increases at the same time;and when the same change in radiative forcing at the tropopause due to the same agent in the two models occurs,the addition of stratospheric response may lead to an in- crease of 5—20 percent in surface temperature;and allowing for the stratospheric adjustment means that the tempera- ture responses to the same flux change due to different causes are in far disagreement.

关键词： greenhouse effect stratosphere 1-D radiative-convective model temperature response

Recent developments of Bragg gratings in PMMA and TOPAS polymer optical fibers

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Recent developments of Bragg gratings in PMMA and TOPAS poly...