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Facile preparation and property analyses of L-CNc/SiO_(2)-based composite superhydrophobic coating

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Frontiers of Materials Science 2022年第4期16卷 37-47页

作者： Wentao HUANG Qihui YE Changying REN Youwei LU yuxin cai Wenbiao ZHANG Jingda HUANG College of Chemistry and Materials Engineering Zhejiang A&F UniversityHangzhou 311300China

In recent years,superhydrophobic coatings have received extensive attention due to their functions of waterproof,antifouling,self-cleaning,***,wide applications of superhydrophobic coatings are still affected by their disadvantages of complex preparation,low mechanical properties,and poor ultraviolet(UV)*** this study,cellulose nanocrystal containing a small amount of lignin(L-CNC)/SiO_(2)composite particles were usedas the main material,polydimethylsiloxane(PDMS)as the adhesive and perfluorooctyltrichlorosilane(FOTS)as the modifier to prepare superhydrophobic coatings by a one-step spray *** resulted coating showed excellent superhydrophobicity(water contact angle(WCA)of 161°and slide angle(SA)of 7)and high abrasion resistance(capable of withstanding 50 abrasion cycles under the load of 50 g).Moreover,it still maintained good superhydrophobicity after 5 h of exposure to the UV light(1000 W),displaying its good UV *** study provides theoretical and technical referencefor thesimple preparationof organic-inorganic composite superhydrophobic coatings with high abrasion resistance and good UV resistance,which is beneficial to improving the practicability and broadening the application scope of superhydrophobic coatings.

关键词： uperhydrophobic coating L-CNc/SiO_(2) abrasion resistance UV resistance

Knowledge Graph:Applications in Tracing the Source of Large-Scale Outbreak—Beijing Municipality,China,2020–2021

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China CDC weekly 2023年第4期5卷 90-95页

作者： Ying Shen Yonghong Liu Xiaokang Jiao yuxin cai Xiang Xu Hui Yao Xiaoli Wang Beijing Office of Global Health Beijing Center for Disease Prevention and ControlBeijingChina Yidu Cloud Technology Co Ltd BeijingChina School of Public Health Capital Medical UniversityBeijingChina

Introduction:Tracing transmission paths and identifying infection sources have been effective in curbing the spread of coronavirus disease 2019(COVID-19).However,when facing a large-scale outbreak,this is extremely time-consuming and laborintensive,and resources for infection source tracing become *** this study,we aimed to use knowledge graph(KG)technology to automatically infer transmission paths and infection ***:We constructed a KG model to automatically extract epidemiological information and contact relationships from case *** then used an inference engine to identify transmission paths and infection *** test the model’s performance,we used data from two COVID-19 outbreaks in ***:The KG model performed well for both *** the first outbreak,20 infection relationships were identified manually,while 42 relationships were determined using the KG *** the second outbreak,32 relationships were identified manually and 31 relationships were determined using the KG *** discrepancies and omissions were ***:The KG model is a promising tool for predicting and controlling future COVID-19 epidemic waves and other infectious disease *** automatically inferring the source of infection,limited resources can be used efficiently to detect potential risks,allowing for rapid outbreak control.

关键词： infection consuming automatically

Anisotropic phonon thermal transport in two-dimensional layered materials

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Frontiers of physics 2023年第4期18卷 217-225页

作者： yuxin cai Muhammad Faizan Huimin Mu Yilin Zhang Hongshuai Zou Hong Jian Zhao Yuhao Fu Lijun Zhang State Key Laboratory of Integrated Optoelectronics Key Laboratory of Automobile Materials of MOEInternational Center of Computational Method and SoftwareSchool of Materials Science and EngineeringJilin UniversityChangchun 130012China State Key Laboratory of Superhard Materials International Center of Computational Method and SoftwareCollege of PhysicsJilin UniversityChangchun 130012China

Two-dimensional layered materials(2DLMs)have attracted growing attention in optoelectronic devices due to their intriguing anisotropic physical *** members of 2DLMs exhibit unique anisotropic electrical,optical,and thermal properties,fundamentally related to their crystal *** them,directional heat transfer plays a vital role in the thermal management of electronic ***,we use density functional theory calculations to investigate the thermal transport properties of representative layered materials:β-InSe,γ-InSe,MoS2,and *** found that the lattice thermal conductivities ofβ-InSe,γ-InSe,MoS_(2),and h-BN display diverse anisotropic behaviors with anisotropy ratios of 10.4,9.4,64.9,and 107.7,*** analysis of the phonon modes further indicates that the phonon group velocity is responsible for the anisotropy of thermal ***,the low lattice thermal conductivity of the layered InSe mainly comes from low phonon group velocity and atomic *** findings provide a fundamental physical understanding of the anisotropic thermal transport in layered *** hope this study could inspire the advancement of 2DLMs thermal management applications in next-generation integrated electronic and optoelectronic devices.

关键词： thermal conductivity two-dimensional layered materials firstprinciples calculation Boltzmann transport theory

Preparation of PVA@PEI@BAC@CNC composite nanofibrous film with high efficiency filtration for PM2.5

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Frontiers of Materials Science 2023年第4期17卷 171-182页

作者： Jingda Huang Yi Wang yuxin cai Yipeng Liang Shite Lin Enfu Wang Jinhuan Zhong Wenbiao Zhang Kuichuan Sheng College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058China College of Chemistry and Materials Engineering Zhejiang A&F UniversityHangzhou 311300China

It is still a challenge to prepare a water-and polymer-based electrospun air filter film with high efficiency filtration,low pressure drop,and good mechanical *** address this issue,polyvinyl alcohol(PVA)was employed as the main material,mixing polyethyleneimine(PEI),bamboo-based activated carbon(BAC)and cellulose nanocrystal(CNC)to construct the air filter film by electrostatic *** this system,the negatively charged BAC and CNC are fixed in the system through bonding with the positively charged PEI,showing a double adsorption *** is the mechanical filtration of the porous network structure constructed by PVA@PEI electrospun nanofibers,and the other is the electrostatic adsorption of PM2.5 on the surface of BAC and *** is significant that the resulting composite air filter displays a high filtration efficiency of 95.86%,a pressure drop of only 59 Pa,and good thermal ***,the introduced methyltrimethoxysilane(MTMS)endows it with good *** these excellent performances,this system can provide theoretical and technical references for the development of water-and polymerbased electrospun air filter film.

关键词： polyvinyl alcohol polyethyleneimine bamboo-based activated carbon cellulose nanocrystals electrospun nanofibrous film PM2.5

Efficient preparation of perovskite solar devices as well as the improvement of fill factor

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Efficient preparation of perovskite solar devices as well as...

Research on the Development of Hospice Care in Beijing

第五届新型太阳能电池学术研讨会

作者： Chao Ji yuxin cai Xuejian Wan Chunjun Liang Key Laboratory of Luminescence and Optical Information Ministry of EducationInstitute of Optoelectronics Beijing Jiaotong University

Recently, researchers focus on simple approach to the preparation of high performance perovskite solar cell device, high performance device have a lot in previously reported article, but most of them need high temperature and evaporation method cumbersome steps, and the repeatability is not good. In this paper we report a very simple method for preparation of high efficient perovskite solar cell device. In addition to the electrode, all of our film is spin up, and get the high efficiency and almost no hysteresis of high-performance *** this work,we can through the comparison between different modified layer to observe influence on device performance and draw the best preparation of high-performance device. It is highly possible that the hysteresis of perovskite devices is connected with the ionic behavior of the perovskite but the detailed mechanism is not clear. Here, we find that the ionic interface charge,which is unique in perovskite devices, is linked with the hysteresis, reproducibility and working stability of the PSCs. Our best device can achieve 18.8% efficiency, and can get a great deal of FF(best 0.826), hysteresis is small in our devices, and have long service life, repeatability is very good. The simple preparation method make high performance mechanism of perovskite solar cell research more convenient. [1] [2]

关键词： hysteresis interface charge

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Journal of Biosciences and Medicines 2021年第2期9卷 33-41页

作者： Shuli Gao Yiping Liu yuxin cai Jixin Jiao Jianqing Bi Business College Beijing Union University Beijing China

In recent years, hospice care in Beijing has developed rapidly. In order to further promote the development of hospice care in Beijing, this paper first analyzes the current situation of hospice care in Beijing, and then analyzes the existing problems of hospice care in Beijing, such as insufficient funds, lack of medical staff, no unified public information platform and low acceptance of hospice care. In view of the existing problems, the paper puts forward relevant policy suggestions for the development of hospice care in Beijing, such as increasing financial support, strengthening the propaganda and education of hospice care, strengthening the training of professional talents, improving the voluntary service system, formulating reasonable access standards, and building a unified public information platform, so as to further promote the effective, healthy and rapid development of hospice care in Beijing development.

关键词： Beijing Hospice Care Current Status

Study on the mechanical properties and service life of H13 mandrels

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Baosteel Technical Research 2011年第2期5卷 53-58页

作者： TIAN yuxin LU Minghe cai Haman ZHANG Jinghai GUO Junxia Special Steel Technology Center Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200940 China

The microstructures and mechanical properties of H13 mandrels made by Baosteel and foreign companies were investigated in this study. Based on the comparison research, the processes were optimized, such as steelmaking, heat treatment and multiple forging processes. The quality of Baosteel mandrels was greatly improved by increasing the homogenizing of an annealing temperature and refining processes. The results of the pilot trial showed that the average number of piercing steel tubes for Baosteel mandrels was over 3000 ,which reached the level of imported mandrels.

关键词： H13 mandrel steer mechanical properties service life

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碱激发混凝土抗氯离子侵蚀性能的数值研究

建筑材料学报 2023年第6期26卷 596-603,622页

作者：蔡渝新刘清风上海交通大学海洋工程国家重点实验室上海200240 上海市公共建筑和基础设施数字化运维重点实验室上海200240

综合考虑碱激发粉煤灰/矿渣(AAFS)混凝土的孔隙率影响、氯离子结合作用和多种离子间电化学耦合效应,在细微观尺度下建立多相多离子传输模型,并通过第三方试验对模型的可靠性进行验证.基于该模型,开展了粉煤灰/矿渣比和激发剂模数对AAFS... 详细信息

综合考虑碱激发粉煤灰/矿渣(AAFS)混凝土的孔隙率影响、氯离子结合作用和多种离子间电化学耦合效应,在细微观尺度下建立多相多离子传输模型,并通过第三方试验对模型的可靠性进行验证.基于该模型,开展了粉煤灰/矿渣比和激发剂模数对AAFS混凝土抗氯离子侵蚀性能影响的数值研究.结果表明:较低的粉煤灰/矿渣比可明显提高AAFS混凝土抗氯离子侵蚀性能,这归因于其对降低孔隙率的贡献;激发剂模数为1.00时AAFS混凝土抗氯离子侵蚀性能最佳,过低或过高的激发剂模数均会增加氯离子在混凝土中的渗透深度.

关键词：碱激发混凝土氯离子耐久性数值模型

Real-time reception of NHS-OFDM signal with SPA- enhanced channel estimation for intensity-modulated direct-detection systems

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Chinese Optics Letters 2022年第5期20卷 7-13页

作者： Gang Chen Ming Chen Wen Chen Lede Yin Aitao Deng yuxin cai Dengqiao Wang School of Physics and Electronics Hunan Normal UniversityChangsha 410081China

In this Letter,we have experimentally verified a low-complexity subcarrier pairwise-averaging(SPA)-enhanced channel estimation(CE)method for small-size fast Fourier transform(FFT)non-Hermitian symmetric orthogonal frequency-division multiplexing(NHS-OFDM)*** with intra-symbol frequency averaging(ISFA),more than 20% look-up tables and 10%logic power consumption can be *** least-square(LS),ISFA,and SPA CE methods are compared by offline and real-time digital signal processing *** results show that the receiver sensitivity of the SPA NHS-OFDM transmission system with 64/128-point FFT can be improved by more than 1 dB at the bit error rate of 3.8 ×10^(-3) compared to the LS.

关键词： NHS-OFDM least-square intra-symbol frequency-averaging subcarrier pairwise-averaging