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| 1 | Surface decoration of Halloysite nanotubes with POSS for fire-safe thermoplastic polyurethane nanocomposites显示文摘Halloysite nanotubes(HNTs)have been considered as a promising flame retardant fillers for polymers.In this work,the polyhedral oligomericsilsesquioxane(POSS)containing amino group was covalently grafted on the surface of HNTs with 3-(2,3-epoxypropoxy)propytrimethoxysilane as a chemical bridge.The POSS modified HNTs(HNTs-POSS)dispersed uniformly in the thermoplastic polyurethane(TPU)matrix and endowed TPU nanocomposites with enhanced tensile properties and fire safety.Cone calorimeter tests revealed that the introduction of 2 wt%HNTs-POSS to TPU matrix remarkably reduced the peak of heat release rate(PHRR)and total heat release(THR)by 60.0%and 18.3%,respectively.In addition,the peak CO production rate and total smoke release(TSR)could be significantly suppressed by the addition of HNTsPOSS.The well dispersed HNTs in combination with the ceramified silicon network from the thermal decomposition of POSS contributed to the formation of a continuous and compact char layer,exhibiting a tortuous effect by inhibiting heat diffusion and evaporation of volatile gaseous.In addition,the released crystal water from HNTs could dilute the combustible volatiles and then decline the combustion intensity.The tensile tests demonstrated that introduction of 2 wt%HNTs-POSS would enhance the maximum stress of TPU nanocomposite with a slight decrease of elongation at break.The combination of HNTs and POSS through the construction of effective interfacial interactions provides a feasible way to effectively enhance the fire safety of TPU nanocomposites without scarifying ductility. | Wei Wu Wanjing Zhao Xianjing Gong Qijun Sun Xianwu Cao Yujun Su Bin Yu Robert K.Y.Li Roy A.L.Vellaisamy | 2022 | Journal of Materials Science & Technology2022，，6： | 2 |
| 2 | Facilely prepared layer-by-layer graphene membrane-based pressure sensor with high sensitivity and stability for smart wearable devices显示文摘With the prosperous development of artificial intelligence,medical diagnosis and electronic skins,wearable electronic devices have drawn much attention in our daily life.Flexible pressure sensors based on carbon materials with ultrahigh sensitivity,especially in a large pressure range regime are highly required in wearable applications.In this work,graphene membrane with a layer-by-layer structure has been successfully fabricated via a facile self-assembly and air-drying(SAAD)method.In the SAAD process,air-drying the self-assembled graphene hydrogels contributes to the uniform and compact layer structure in the obtained membranes.Owing to the excellent mechanical and electrical properties of graphene,the pressure sensor constructed by several layers of membranes exhibits high sensitivity(52.36 kPa……-1)and repeatability(short response and recovery time)in the loading pressure range of 0–50 kPa.Compared with most reported graphene-related pressure sensors,our device shows better sensitivity and wider applied pressure range.What’s more,we demonstrate it shows desired results in wearable applications for pulse monitoring,breathing detection as well as different intense motion recording such as walk,run and squat.It’s hoped that the facilely prepared layer-by-layer graphene membrane-based pressure sensors will have more potential to be used for smart wearable devices in the future. | Tao Liu Caizhen Zhu Wei Wu Kai-Ning Liao Xianjing Gong Qijun Sun Robert K.Y.Li | 2020 | Journal of Materials Science & Technology2020，42，10： | 2 |
| 3 | Double-Layer-Optimizing Method of Hybrid Energy Storage Microgrid Based on Improved Grey Wolf Optimization显示文摘To reduce the comprehensive costs of the construction and operation of microgrids and to minimize the power fluctuations caused by randomness and intermittency in distributed generation,a double-layer optimizing configuration method of hybrid energy storage microgrid based on improved grey wolf optimization(IGWO)is proposed.Firstly,building a microgrid system containing a wind-solar power station and electric-hydrogen coupling hybrid energy storage system.Secondly,the minimum comprehensive cost of the construction and operation of the microgrid is taken as the outer objective function,and the minimum peak-to-valley of the microgrid’s daily output is taken as the inner objective function.By iterating through the outer and inner layers,the system improves operational stability while achieving economic configuration.Then,using the energy-self-smoothness of the microgrid as the evaluation index,a double-layer optimizing configuration method of the microgrid is constructed.Finally,to improve the disadvantages of grey wolf optimization(GWO),such as slow convergence in the later period and easy falling into local optima,by introducing the convergence factor nonlinear adjustment strategy and Cauchy mutation operator,an IGWO with excellent global performance is proposed.After testing with the typical test functions,the superiority of IGWO is verified.Next,using IGWO to solve the double-layer model.The case analysis shows that compared to GWO and particle swarm optimization(PSO),the IGWO reduced the comprehensive cost by 15.6%and 18.8%,respectively.Therefore,the proposed double-layer optimizationmethod of capacity configuration ofmicrogrid with wind-solar-hybrid energy storage based on IGWO could effectively improve the independence and stability of the microgrid and significantly reduce the comprehensive cost. | Xianjing Zhong Xianbo Sun Yuhan Wu | 2023 | Computers, Materials & Continua2023，76，8： | 0 |
| 4 | Study on the technology of 3W1 superconducting magnet显示文摘Introduction The superconducting wiggler magnet named as 3W1 is the key device for the test facility for the High Energy Photon Source(HEPS).The magnet structure is 1430 mm long with a gap of 68 mm,and the designed peak field is 2.6 T.The main magnet part is comprised by 28 main coils and 4 correction coils at both ends.Due to the large gap and high field,the manufacturing process is extremely difficult.Method During R&D,the problems of coil winding,impregnation,pre-stress evaluation and quench risk control were solved by optimizing the technology.The coils were divided into groups to complete the cryogenic test,and the qualified coils were selected to complete the assembly of the magnet.Conclusion The bare magnet has been tested with liquid helium bath in April 2018 in IHEP,and the loading current reached up to 345 A resulting in the expected 2.61 T.In this paper,the technology about the coil winding,impregnation,assembling and test is presented in detail. | Xiangchen Yang Fusan Chen Xianjing Sun Xiaojuan Bian Wan Chen Huihua Lu Zhiqiang Li | 2022 | Radiation Detection Technology and Methods2022，6，1： | 0 |
| 5 | Themagnetic field measurement system for HEPS-TF superconducting wiggler显示文摘Background High Energy Photon Source(HEPS)is the fourth-generation synchrotron radiation source to be established in China.HEPS is a high-performance and high-energy synchrotron radiation light source with a beam energy of 6 GeV and an ultra-low emittance of better than 0.06 nm×rad(http://gffzz0c2c778f4fee478bhpfof6bncwncx6voo.ffgz.tsg.suse.edu.cn/heps/index.html).Superconducting 3W1 wiggler magnet is one of the insertion devices in High Energy Photon Source Test Facility project(HEPS-TF).And it is also the key component to obtain higher brightness in high photon energy range.Purpose In the development process of superconducting wiggler,in order to ensure the magnetic field quality of each processing,it is necessary to monitor the magnetic field performance of before and after the full length bare magnet installed with cryostat.Therefore,different magnetic field measuring devices are being developed for different develop stages.Methods The magnetic field performance of the full length bare magnet should be tested in vertical at low temperature.After the magnetic structure is installed in the horizontal cryostat,the horizontal test is carried out.In view of these two processes,the vertical magnetic field measurement system and the horizontal magnetic field measurement system have been developed,respectively.Results The magnetic performances of the full length bare magnet and assembled with the horizontal cryostat were measured by the vertical and horizontal magnetic field measurement system.The first and second field integrals are corrected to better than the Physical requirements according to the magnetic field measurement results.Detailed magnetic field performances are described in this paper.Conclusion After more than a year operation of 3W1-SCW on the BII line station,the characteristic energy and photon flux of synchrotron radiation have been greatly improved,and the performance is excellent.It indicates that the measurement results of the magnetic field measurement system are reliable and credible. | Wan Chen ZhiQiang Li Zhuo Zhang XiangChen Yang FuSan Chen XianJing Sun Huihua Lu | 2022 | Radiation Detection Technology and Methods2022，6，1： | 0 |
| 6 | Intrinsic superconducting transport properties of ultra-thin Fe_(1+y)Te_(0:6)Se_(0:4) microbridges显示文摘We investigated the superconducting properties of Fe_(1+y)Te_(0:6)Se_(0:4) single-crystalline microbridges with a width of 4 m and thicknesses ranging from 20.8 to 136.2 nm. The temperature-dependent in-plane resistance of the bridges exhibited a type of metalinsulator transition in the normal state. The critical current density(J_c) of the microbridge with a thickness of 136.2 nm was82.3 kA/cm^2 at 3K and reached 105 kA/cm^2 after extrapolation to T = 0 K. The current versus voltage characteristics of the microbridges showed a Josephson-like behavior with an obvious hysteresis. These results demonstrate the potential application of ultra-thin Fe-based microbridges in superconducting electronic devices such as bolometric detectors. | HanCong Sun YangYang Lv DaChuan Lu ZhiBao Yang XianJing Zhou LuYao Hao XiangZhuo Xing Wei Zou Jun Li ZhiXiang Shi WeiWei Xu HuaBing Wang PeiHeng Wu | 2017 | Science China(Physics,Mechanics & Astronomy)2017，60，11： | 0 |
| 7 | Anti-inflammatory Activity of Phenolic Acids on HAECs Induced by TNF-α显示文摘[Objectives] To study the anti-inflammatory activity and mechanism of salvianolic acid A(Sal A), salvianolic acid C(Sal C), and rosmarinic acid(RA) on HAECs induced by TNF-α. [Methods] VE was used as a positive control and TNF-α induced human aortic endothelial cells(HAECs) were selected as the inflammation model cells. The levels of IL-6, MCP-1 were determined using ELISA. The mRNA levels of IL-6, MCP-1, ICAM-1, P-selectin and NF-κB were analyzed by quantitative RT-PCR. The protein expression of NF-κB was determined by western blot. The adhesion of U937 to HAECs was assessed by BCECF/AM labeling assay. Immunohistochemistry detection was used for ICAM-1 and P-selectin expression levels in TNF-induced HAECs, and DHE detection for the ROS production in HAECs induced by TNF-α. [Results] TNF-α-induced over-expressions of IL-6, MCP-1, NF-κB, ICAM-1 and P-selectin in HAECs were down-regulated by Sal A, Sal C and RA both in mRNA or protein levels, respectively. Meanwhile Sal A, Sal C and RA could significantly inhibit the production of ROS and U937 cells adhesion to HAECs. [Conclusions] Phenolic acids could inhibit TNF-α-induced inflammatory responses on HAECs and the mechanism might be related to inhibition of the production of ROS and blocking NF-κB signaling pathway. | Xiaoyu ZHANG Xianjing ZHENG Hongrui XIA Longru SUN | 2019 | Medicinal Plant2019，10，2： | 0 |
| 8 | Fabrication of Al/AlO_x/Al Josephson junctions on silicon and sapphire substrates using a cold-development technique显示文摘In order to obtain high-quality superconducting qubits, we employed a cold-development technique, using temperatures down to-20°C, to fabricate Al/AlOx/Al Josephson junctions. Cold development greatly reduced the sensitivity of the electron-beam resist to the developer, eliminated molecules of the electron-beam resist at trench edges, and improved the repeatability and reliability of the nanopatterning process. The fabricated samples have well-defined geometries and increased dose margins, with lateral sizes of 100 nm×100 nm on both silicon and sapphire substrates. Together with the bridge-free fabrication method we used in these experiments, we believe that the cold-development technique can play an important role in quantum information technology that employs superconducting qubits. | Wei Chen JiaZheng Pan ZuYu Xu YangYang Lv XianJing Zhou XueCou Tu Jun Li GuoZhu Sun HuaBing Wang | 2019 | Science China(Physics,Mechanics & Astronomy)2019，62，6： | 0 |
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