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Noncovalent cross-linked engineering hydrogel with low hysteresis and high sensitivity for flexible self-powered electronics

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Journal of Energy Chemistry 2024年第7期94卷 136-147页

作者： hang Yuan Shaowei Han jia Wei Songwei Li Peipei Yang Hao-Yang Mi Chuntai Liu Changyu Shen National Engineering Research Center for Advanced Polymer Processing Technology Key Laboratory of Materials Processing and Mold(Ministry of Education)Zhengzhou UniversityZhengzhou450002HenanChina Yunnan TobaccoQuality Inspection&Supervision Station Kunming 650106YunnanChina

In this study,the hydrogel network was reinforced by covalent-like hydrogen bonding,and the strong binding ability of boron-nitrogen coordination served as the main driving *** them,acrylamide(AM)and 3-acrylamidophenylboronic acid(AAPBA)were the main body,and the numerous hydroxyl groups in the trehalose(Treh)molecule and other polymer groups formed strong hydrogen bonding interactions to improve the mechanical properties of the PAM/PAAPBA/Treh(PAAT)hydrogel and ensured the simplicity of the synthesis *** hydrogel possessed high strain at break(1239%),stress(64.7 kPa),low hysteresis(100%to 500%strain,corresponding to dissipation energy from 1.37 to 7.80 kJ/m^(3)),and outstanding cycling stability(retained more than 90%of maximum stress after 200 ten-sile cycles).By integrating carbon nanotubes(CNTs)into PAAT hydrogel(PAATC),the PAATC hydrogel with excellent strain response performance was successfully *** PAATC conductive hydro-gel exhibited high sensitivity(gauge factor(GF)=10.58 and sensitivity(S)=0.304 kPa^(-1)),wide strain response range(0.5%-1000%),fast response time(450 ms),and short recovery time(350 ms),excellent fatigue resistance,and strain response ***,the PAATC-based triboelectric nanogener-ator(TENG)displayed outstanding energy harvesting performance,which shows its potential for appli-cation in self-powered electronic devices.

关键词： Low hysteresis Covalent-like hydrogen bonding Boron-nitrogen coordination Hydrogel sensor Triboelectric nanogenerator

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Corrosion behavior of Zr–Nb–Cr cladding alloys

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Rare Metals 2013年第5期32卷 480-485页

作者： Wei-jia Gong Cong-Feng Wu hang Tian Xiao-Dong Ni Hai-Long Zhang Xi-Tao Wang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing School of Mathematics and Physics University of Science and Technology Beijing

Zr-Nb-Cr alloys were used to evaluate the effects of alloying elements Nb and Cr on corrosion behavior of zirconium alloys. The microstructures of both Zr substrates and oxide films formed on zirconium alloys were characterized. Corrosion tests reveal that the corro- sion resistance of ZrxNb0.1Cr （x = 0.2, 0.5, 0.8, 1.1; wt%） alloys is first improved and then decreased with the increase of the Nb content. The best corrosion resistance can be obtained when the Nb concentration in the Zr matrix is nearly at the equilibrium solution, which is closely responsible for the formation of columnar oxide grains with protective characteristics. The Cr addition degrades the corrosion resistance of the *** alloy, which is ascribed to Zr（Cr,Fe,Nb）2 precipitates with a much larger size than β-Nb.

关键词： Zirconium alloys Corrosion Precipitates Alloying elements Transmission electron microscope

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Bone Microthrombus Promotes Bone Loss in Iron Accumulation Rats

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Current Medical Science 2020年第5期40卷 943-950页

作者： Hai-feng hang Long-jia DONG Xin-bing TANG Ai-fei WANG Fan YANG Hui Zhang You-jia XU Department of Orthopedics Second Affiliated Hospital of Soochow UniversitySuzhou 215004China Department of Orthopedics The Affiliated Baiyun Hospital of Guizhou Medical UniversityGuizhou 550014China Osteoporosis Institute Soochow UniversitySuzhou 215004China Department of Orhopedics Jiangdu People's Hospital of YangzhouYangzhou 225200China

In the present study,we investigated the changes of the coagulation state,bone microthrombus,microvascular bed and bone density levels in iron accumulation ***,the effect of anticoagulation therapy on bone mineral density was further *** established two groups:a control(Ctrl)group and an iron intervention(FAC)*** in coagulation function,peripheral blood cell counts,bone microthrombus,bone vessels and bone mineral density were compared between the two *** designed the non-treatment group and treatment group to study the changes of bone mineral density by preventing microthrombus formation with the anticoagulant *** found that the fbrinogen and D-dimer contents were significantly higher,whereas the thrombin time(TT)and prothrombin time(PT)were significantly shorter in the FAC *** ink staining,the microvascular bed in the FAC group was significantly reduced compared with that in the Ctrl *** and Martius Scarlet Blue(MSB)staining showed microthrombus in the bone marrow of the iron accumulation *** anticoagulation therapy,the bone microcirculation vascular bed areas in the treatment group rats were significantly ***,the bone mineral density was increased in the treatment group compared with that in the non-treatment *** experiments,we found that the blood in iron accumulation rat was relatively hypercoagulable;moreover,there was microthrombus in the bone marrow,and the bone vascular bed was ***,anticoagulation was helpful for improving bone microcirculation,reducing microthrombus and decreasing bone loss.

关键词： iron accumulation osteoporosis coagulation state microvascular bed bone microthrombus anticoagulant

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Hyperparameter Optimization for Machine Learning Models Based on Bayesian Optimization

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Journal of Electronic Science and Technology 2019年第1期17卷 26-40页

作者： jia Wu Xiu-Yun Chen Hao Zhang Li-Dong Xiong hang Lei Si-Hao Deng the School of Information and Software Engineering University of Electronic Science and Technology of China Université de Technologie de Belfort-Montbéliard

Hyperparameters are important for machine learning algorithms since they directly control the behaviors of training algorithms and have a significant effect on the performance of machine learning models. Several techniques have been developed and successfully applied for certain application domains. However, this work demands professional knowledge and expert experience. And sometimes it has to resort to the brute-force ***, if an efficient hyperparameter optimization algorithm can be developed to optimize any given machine learning method, it will greatly improve the efficiency of machine learning. In this paper, we consider building the relationship between the performance of the machine learning models and their hyperparameters by Gaussian processes. In this way, the hyperparameter tuning problem can be abstracted as an optimization problem and Bayesian optimization is used to solve the problem. Bayesian optimization is based on the Bayesian theorem. It sets a prior over the optimization function and gathers the information from the previous sample to update the posterior of the optimization function. A utility function selects the next sample point to maximize the optimization *** experiments were conducted on standard test datasets. Experiment results show that the proposed method can find the best hyperparameters for the widely used machine learning models, such as the random forest algorithm and the neural networks, even multi-grained cascade forest under the consideration of time cost.

关键词： Bayesian optimization Gaussian process hyperparameter optimization machine learning

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Schiff-base silver nanocomplexes formation on natural biopolymer coated mesoporous silica contributed to the improved curative effect on infectious microbes

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Nano Research 2021年第8期14卷 2735-2748页

作者： Ling Cai Yanqiang Huang Yuanyuan Duan Qiao Liu Qilan Xu jia jia jianming Wang Qian Tong Peipei Luo Yujie Wen Luming Peng Qian Wu Xudong hang Huijun jiang Ping Zhu Yanmei Yang Boshen zhou Liping Zeng Hongkai Bi Jin Chen Center for Global Health The Key Laboratory of Modern ToxicologyMinistry of EducationSchool of Public HealthNanjing Medical UniversityNanjing 211166China Department of Pathogen Biology Jiangsu Key Laboratory of Pathogen BiologyNanjing Medical UniversityNanjing 211166China Research Center for the Prevention and Treatment of Drug Resistant Microbial Infecting Youjiang Medical University for Nationalities Baise 533000China The Laboratory Center for Basic Medical Sciences Nanjing Medical UniversityNanjing 211166China Key Laboratory of Mesoscopic Chemistry of MOE and Collaborative Innovation Center of Chemistry for Life Sciences School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210023China School of Pharmacy Nanjing Medical UniversityNanjing 211166China Department of Gastroenterology Sir Run Run HospitalNanjing Medical UniversityNanjing 211166China Key Laboratory of Antibody Technique of National Health Commission Nanjing Medical UniversityNanjing 211166China

Infectious microbes that spread easily in healthcare facilities remain as the severe threat for the public health,especially among immunocompromised *** the intricate problem of dramatic increase in resistance to common biocides,the development of safe and efficient biocide formulated agents to alleviate drug resistance is highly *** this study,Schiff-base ligands were successfully formed on natural biopolymer of epsilon-poly-L-lysine(ε-PL)decorated aldehyde functionalized mesoporous silica SBA-15(CHO-SBA-15)for the selective coordination of silver ions,which was affirmed by various physicochemical *** the identified broad-spectrum antibacterial activities,the as-prepared Schiff-base silver nanocomplex(CHO-SBA-15/ε-PL/Ag,CLA-1)exhibited an improved inhibitory effect on infectious pathogen growth typified by Escherichia coli and Staphylococcus aureus in comparison with two control silver complexes without Schiff-base conjugates,SBA-15/ε-PL/Ag and CHO-SBA-15/Ag,*** addition,CLA-1 remarkably inhibited the growth of Mycobacterium tuberculosis due to the excellent antimicrobial activity of silver ***,CLA-1 kills Candida albicans cells,inhibits biofilm formation,and eliminates preformed biofilms,with no development of resistance during continuous serial *** antifungal activity is connected to disruption of bacterial cell membranes and increased levels of intracellular reactive oxygen *** mouse models of multidrug-resistant *** infection,CLA-1 exhibited efficient in vivo fungicidal efficacy superior to two antifungal drugs,amphotericin B and ***,CLA-1 treatment induces negligible toxicity against normal tissues with ***,this study reveals the pivotal role of the molecular design of Schiff-base silver nanocomplex formation on biopolymer surface-functionalized silica mesopores as a green and efficient nanoplatform to tackle infectious microbes.

关键词： biopolymer drug delivery mesoporous silica silver nanoparticles antimicrobial drug resistance

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Fermionic Analogue of High Temperature Hawking Radiation in Black Phosphorus

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Chinese Physics Letters 2020年第6期37卷 80-85页

作者： hang Liu jia-Tao Sun Chenchen Song Huaqing Huang Feng Liu Sheng Meng Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China Department of Materials Science and Engineering University of UtahSalt Lake CityUtah 84112USA Collaborative Innovation Center of Quantum Matter Beijing 100084China University of Chinese Academy of Sciences Beijing 100049China

Time-periodic laser driving can create nonequilibrium states not accessible in equilibrium,opening new regimes in materials engineering and topological phase *** report that black phosphorus(BP)exhibits spatially nonuniform topological Floquet-Dirac states under laser illumination,mimicking the"gravity"felt by fermionic quasiparticles in the same way as that for a Schwarzschild black hole(SBH).Quantum tunneling of electrons from a type-ⅡDirac cone(inside BH)to a type-ⅠDirac cone(outside BH)emits an SBH-like Planck radiation *** Hawking temperature T_H obtained for a fermionic analog of BH in the bilayer BP is approximately 3K,which is several orders of magnitude higher than that in previous *** work sheds light on increasing T_H from the perspective of engineering 2D materials by time-periodic light *** predicted SBH-like Hawking radiation,accessible in BP thin films,provides clues to probe analogous astrophysical phenomena in solids.

关键词： spectrum. illumination topological

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Channel Capacity and Power Allocation of MIMO Visible Light Communication System

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China Communications 2023年第2期20卷 122-138页

作者： Shuai Ma Ruixin Yang Guanjie Zhang hang Li Wen Cao Linqiong jia Yanyu Zhang Shiyin Li Peng Cheng Laboratory Shenzhen 518055China School of Information and Control Engineering China University of Mining and TechnologyXuzhou 221116China Shenzhen Research Institute of Big Data Shenzhen 518172China School of Electronics and Control Engineering Chang’an UniversityXi’an 710064China School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094China National Digital Switching System Engineering&Technological Research Center Zhengzhou 450000China

In this paper,the channel capacity of the multiple-input multiple-output(MIMO)visible light communication(VLC)system is investigated under the peak,average optical and electrical power *** the channel capacity of MIMO VLC is shown to be a mixed integer programming *** address this open problem,we propose an inexact gradient projection method to find the channel capacity-achieving discrete input distribution and the channel capacity of MIMO *** we derive both upper and lower bounds of the capacity of MIMO VLC with the closed-form ***,by considering practical discrete constellation inputs,we develop the optimal power allocation scheme to maximize transmission rate of MIMO VLC *** results show that more discrete points are needed to achieve the channel capacity as SNR *** the upper and lower bounds of channel capacity are tight at low SNR *** addition,comparing the equal power allocation,the proposed power allocation scheme can significantly increase the rate for the low-order modulation inputs.

关键词： visible light communication MIMO discrete constellation inputs power allocation

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A Potential Alternative to Polystyrene: Ring-opening Terpolymerization of Different Epoxides with Phthalic Anhydride Using Metal-free Dual Catalysts

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Chinese Journal of Polymer Science 2021年第3期39卷 337-343,I0006页

作者： Li-Miao Lin Yong-hang Xu Man Shen jia-Xin Liang Shuan-Jin Wang Min Xiao Yue-Zhong Meng The Key Laboratory of Low-carbon Chemistry&Energy Conservation of Guangdong Province/State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China School of Environmental and Chemical Engineering Foshan UniversityFoshan 528000China School of Materials Science&Energy Engineering Foshan UniversityFoshan 528000China

A series of semi-aromatic polyesters named as Poly(PO-CHO-PA) were facilely synthesized via ring-opening terpolymerization of biobased cyclohexane oxide(CHO)/propylene oxide(PO)/phthalic anhydride(PA) using economical U1/PPNCl as dual catalyst. The proportion of CHO-PA and PO-PA segments in polymer can be readily altered by changing the feed ratio of CHO/PO because the reactivity ratios of CHO and PO with PA calculated by Fineman-Ross method are comparable. All synthesized amorphous polyesters with various compositions show one Tg ranging from 62 ℃ to 133 ℃. Significantly, the mechanical, thermal and barrier properties of these amorphous semi-aromatic polyesters are also adjustable and investigated for the first time. The results indicate the semi-polyesters exhibit superior thermostability(T5% ranging from 306 ℃ to323 ℃) and high tensile strength(40.21-55.7 MPa) that is comparable with polystyrene(PS). Furthermore, Poly(PO-CHO-PA) films possess a promising prospect as packaging materials because of its colorless and highly transparent nature, along with low oxygen and water vapor transmission rate. All above performances may guarantee its potential alternative to commercial PS.

关键词： Aromatic polyester Ring-opening polymerization Metal-free catalyst Polystyrene Barrier properties

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Graphene oxide effects on the properties of Al2O3-Cu/35W5Cr composite

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Journal of Materials Science & Technology 2020年第2期37卷 185-199页

作者： Xiaohui Zhang Yi Zhang Baohong Tian Yanlin jia Ming Fu Yong Liu Kexing Song AlexAVolinsky Xiao Yang hang Sun School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China Collaborative Innovation Center of Nonferrous Metals Henan ProvinceLuoyang 471023China Henan Key Laboratory of Nonferrous Materials Science and Processing Technology Luoyang 471023China College of Materials Science and Engineering Beijing University of TechnologyBeijing 100124China China Airborne Missile Academy Luoyang 471023China Department of Mechanical Engineering University of South FloridaTampa 33620USA Luoyang Ship Material Research Institute Luoyang 471023China

Graphene oxide(GO)nanosheets were dispersed into premixed powders(Cu-0.4 wt%Al/35W5Cr)by wet grinding and vacuum freeze-drying *** 0.3 wt%GO/Al2O3-Cu/35W5Cr and 0.5 wt%GO/Al2O3-Cu/35W5Cr composites,used for electrical contacts,were fabricated by vacuum hot-pressing *** microstructure was analyzed by field emission scanning electron and transmission electron *** addition,the Raman spectroscopy and X-ray photoelectron spectroscopy were used to investigate the structural changes of GO before and after *** arc erosion behavior was investigated by the JF04 C electrical contact testing ***,the Al2O3 nanoparticles were evenly dispersed in the matrix,causing dislocation *** was converted to reduced graphene oxide after sintering.A group of carbon atoms combined with Cr forming Cr3C2 in situ during sintering,which enhanced the interface *** with the Al2O3-Cu/35W5Cr composite,the tensile strength of the two contact materials containing 0.3 wt%GO and 0.5 wt%GO was increased by 45%and 34%,***,pips and craters were present on the anode and cathode surfaces,*** has undergone re-sintering during arcing and formed needle-like *** with Al2O3-Cu/35W5Cr,the GO/Al2O3-Cu35W5Cr composites have better welding *** final mass transfer direction of the two composites was from the cathode to anode.

关键词： Graphene oxide Freeze-drying Electrical contact In situ formed Cr3C2 Tensile strength

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N6-methyladenosine modified LINC00901 promotes pancreatic cancer progression through IGF2BP2/MYC axis

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Genes & Diseases 2023年第2期10卷 554-567页

作者： Wan-Xin Peng Fei Liu jia-Hong jiang hang Yuan Ziqiang Zhang Liu Yang Yin-Yuan Mo Department of Surgical Oncology The Children's HospitalZhejiang University School of MedicineNational Research Center for Child HealthHangzhouZhejiang 310052China Cancer Center and Research Institute University of Mississippi Medical CenterJacksonMS 39216USA Department of Nephrology The Children's HospitalZhejiang University School of MedicineNational Research Center for Child HealthHangzhouZhejiang 310052China Department of Medical Oncology Zhejiang Provincial People's HospitalPeople's Hospital of Hangzhou Medical CollegeHangzhouZhejiang 310014China Department of Colorectal Surgery Zhejiang Provincial People's HospitalPeople's Hospital of Hangzhou Medical CollegeHangzhouZhejiang 310014China Department of Pulmonary Medicine Tongji HospitalTongji UniversityShanghai 200065China Key Laboratory of Tumor Molecular Diagnosis and Individualized Medicine of Zhejiang Province Zhejiang Provincial People's HospitalPeople's Hospital of Hangzhou Medical CollegeHangzhouZhejiang 310014China Department of Pharmacology/Toxicology University of Mississippi Medical CenterJacksonMS 39216USA

Accumulating evidence indicates that RNA methylation at N6-methyladenosine(m6A)plays an important regulatory role in gene expression and aberrant mRNA m6A modification is often associated with a variety of ***,little is known whether and how m6A-modification impacts long non-coding RNA(lncRNA)and lncRNA-mediated tumorigenesis,particularly in pancreatic ductal adenocarcinoma(PDAC).In the present study,we report that a previously uncharacterized lncRNA,LINC00901,promotes pancreatic cancer cell growth and invasion and moreover,LINC00901 is subject to m6A modification which regulates its *** this regard,YTHDF1 serves as a reader for the m6A modified LINC00901 and downregulates the LINC00901 ***,two conserved m6A sites in LINC00901 are critical to the recognition of LINC00901 by ***,RNA sequencing(RNA-seq)and gene function analysis revealed that LINC00901 positively regulates MYC through upregulation of IGF2BP2,a known RNA binding protein that can enhance MYC mRNA ***,our results suggest that there is a LINC00901-IGF2BP2-MYC axis through which LINC00901 promotes PDAC progression in an m6A dependent manner.

关键词： IGF2BP2 LINC00901 MYC N6-methyladenosine modification(m6A) PDAC YTHDF1

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