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Carbon Energy 2023年第5期5卷 48-56页

作者： Youchen Hao xifei Li Wen Liu Jingjing Wang Hui Shan Wenbin Li xingjiang Liu Liangxu Lin xianyou Wang Xueliang Sun Shaanxi International Joint Research Centre of Surface technology for Energy Storage Materials Xi'an Key Laboratory of New Energy Materials and DevicesInstitute of Advanced Electrochemical Energy&School of Materials Science and EngineeringXi'an University of TechnologyXi'anChina science and technology on Power Sources Laboratory Tianjin Institute of Power SourcesTianjinPR China Strait Institute of Flexible Electronics(SIFE Future Technologies)Fujian Normal UniversityFuzhouFuzhouChina Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education School of ChemistryXiangtan UniversityXiangtanHunanChina Department of Mechanical and Materials Engineering University of Western OntarioLondonOntarioCanada

The high-rate cyclability of Li-rich Mn-based oxide(LMO)is highly limited by the electrochemical polarization resulting from the slow kinetic of the Li2MnO3 ***,the Prussian blue(PB)coating layer with specific redox potential is introduced as a functionalized interface to overcome the side effect and the escaping of O on the surface of LMO,especially its poor rate *** detail,the PB layer can restrict the large polarization of LMO by sharing overloaded current at a high rate due to the synchronous redox of PB and ***,an enhanced high rate performance with capacity retention of 87.8%over 300 cycles is obtained,which is superior to 50.5%of the pristine *** strategies on the high-rate cyclability of Li-rich Mn-based oxide compatible with good low-rate performances may attract great attention for pursuing durable performances.

关键词： Li-rich Mn-based oxide Prussian blue coating layer synchronous redox high-rate cyclability

Recycling Carbon Resources from Waste PET to Reduce Carbon Dioxide Emission:Carbonization technology Review and Perspective

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Journal of Renewable Materials 2023年第5期11卷 2085-2108页

作者： xing Zhou Qi Wang Sai Feng Jingrui Deng Keming Zhu Yun xing xiaolian Meng xiaojun Wang Lu Li Faculty of Printing Packaging Engineering and Digital Media TechnologyXi’an University of TechnologyXi’an710048China School of Materials science and Engineering Jingdezhen Ceramic InstituteJingdezhen333403China Environmental Resources and Material Industry technology Research Institute of Zhongzhao Construction Groups Guangzhou510623China Research Institute Transfar Chemicals GroupHangzhou311215China Key Laboratory of Auxiliary Chemistry and technology for Chemical Industry Ministry of EducationShaanxi University of Science and TechnologyXi’an710021China Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry and technology Shaanxi University of Science and TechnologyXi’an710021China

Greenhouse gas emissions from waste plastics have caused global warming all over the world,which has been a central threat to the ecological environment for humans,flora and *** waste plastics,waste polyethylene terephthalate(PET)is attractive due to its excellent stability and ***,merging China’s carbon peak and carbon neutrality goals would be *** this review,we summarize the current state-of-the-art of carbon emission decrease from a multi-scale perspective *** suggest that the carbon peak for waste PET can be achieved by employing the closed-loop supply chain,including recycling,biomass utilization,carbon capture and *** PET can be a valuable and renewable resource in the whole life ***,all kinds of PET plastics can be ultimately converted into CO_(2),which can also be feedstock for various kinds of chemical products,including ethyl alcohol,formic acid,soda ash,PU,starch and so *** a result,the closed-loop supply chain can help the PET plastics industry drastically reduce its carbon footprint.

关键词： Carbon peak emission PET plastic recycling waste management

A Trojan horse biomimetic delivery system using mesenchymal stem cells for HIF-1α siRNA-loaded nanoparticles on retinal pigment epithelial cells under hypoxia environment

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International Journal of Ophthalmology(English edition) 2022年第11期15卷 1743-1751页

作者： Lei Zhang Jie-Jing Yan Hai-Yan Wang Mu-Qiong Li xi-xi Wang Li Fan Yu-Sheng Wang Shaanxi Eye Hospital Xi'an People's Hospital(Xi'an Fourth Hospital)Xi'an 710004Shaanxi ProvinceChina Department of Ophthalmology Xijing HospitalXi'an 710032Shaanxi ProvinceChina Ophthalmology Department Xi'an No.1 Hospitalthe First Affiliated Hospital of Northwest UniversityXi'an 710002Shaanxi ProvinceChina Department of Pharmaceutical Chemistry and Analysis School of Pharmacy Air Force Medical University Xi'an 710032Shaanxi ProvinceChina Department of Mathematics and Statistics University of Arkansas at Little RockLittle RockAR 72204USA

AIM: To demonstrate the feasibility of mesenchymal stem cell(MSC)-mediated nano drug delivery, which was characterized by the “Trojan horse”-like transport of hypoxiainducible factor-1α small interfering RNA(HIF-1α si RNA) between MSCs and retinal pigment epithelial cells(RPE) under hypoxia ***: Plasmid and lentivirus targeting the human HIF-1α gene were designed and constructed. HIF-1α si RNA was encapsulated into poly(lactic-co-glycolic acid) nanoparticles(PLGA-NPs) through the water-in-oil-in-water(w/o/w) multiple emulsion technique. The effect of PLGANPs uptake on the expression of HIF-1α m RNA was tested in RPE cells by real-time quantitative polymerase chain reaction(q PCR) and additional transfected conditions were used as control, including lentivirus group, nude plasmid group and blank PLGA group. MSCs were transfected with the NPs and the transfection efficacy was evaluated by flow cytometry. Transwell co-culture system of transfected MSCs and RPE cells was constructed under hypoxia environment. The effects of MSC-loaded HIF-1α si RNA PLGA-NPs on proliferation, apoptosis, and migration of RPE cells were then evaluated. The effect of transfected MSCs on HIF-1α expression of RPE cells was analyzed by using q PCR at the time points 24h, 3d, and ***: The average diameter of PLGA-NPs loaded with HIF si RNA was 314.1 nm and the zeta potential was-0.36 m V. The transfection efficiency of PLGA-NPs was 67.3%±5.2% into MSCs by using flow cytometry. Compared with the lentivirus group, the PLGA-NPs loaded with HIF-1α si RNA can effectively reduce the expression of HIF-1α m RNA up to 7d in RPE(0.63±0.05 at 7d, P<0.001). In the Transwell co-culture system of transfected MSCs and RPE, the abilities of proliferation(2.34±0.17, 2.40±0.28, 2.47±0.24 at 48h, F=0.23, P=0.80), apoptosis(14.83%±2.43%, 12.94%±2.19%, 12.39%±3.21%;F=0.70, P=0.53) and migration(124.5±7.78, 119.5±5.32, 130±9.89, F=1.33, P=0.33) of the RPE cells had no differences between MSClo

关键词： hypoxia mesenchymal stem cells poly(lactic-co-glycolic acid)nanoparticles hypoxia-inducible factor-1α retinal pigment epithelial cells

An attention-based cascade R-CNN model for sternum fracture detection in X-ray images

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CAAI Transactions on Intelligence technology 2022年第4期7卷 658-670页

作者： Yang Jia Haijuan Wang Weiguang Chen Yagang Wang Bin Yang School of Computer Xi'an University of Posts and TelecommunicationsXi'anShaanxiChina Shaanxi Key Laboratory of Network Data Intelligent Processing Xi'an University of Posts and TelecommunicationsXi'anShaanxiChina xi'an Key Laboratory of Big Data and Intelligent Computing Xi'anShaanxiChina Department of Radiology Xi'an Honghui HospitalXi'anChina

Fracture is one of the most common and unexpected *** not treated in time,it may cause serious consequences such as joint stiffness,traumatic arthritis,and nerve *** computer vision technology to detect fractures can reduce the workload and misdiagnosis of fractures and also improve the fracture detection ***,there are still some problems in sternum fracture detection,such as the low detection rate of small and occult *** this work,the authors have constructed a dataset with 1227 labelled X-ray images for sternum fracture *** authors designed a fully automatic fracture detection model based on a deep convolution neural network(CNN).The authors used cascade R-CNN,attention mechanism,and atrous convolution to optimise the detection of small fractures in a large X-ray image with big local *** authors compared the detection results of YOLOv5 model,cascade R-CNN and other state-of-the-art *** authors found that the convolution neural network based on cascade and attention mechanism models has a better detection effect and arrives at an mAP of 0.71,which is much better than using the YOLOv5 model(mAP=0.44)and cascade R-CNN(mAP=0.55).

关键词： attention mechanism cascade R-CNN fracture detection X-ray image

Phase-mediated cobalt phosphide with unique core-shell architecture serving as efficient and bifunctional electrocatalyst for hydrogen evolution and oxygen reduction reaction

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Chinese Chemical Letters 2022年第8期33卷 3752-3756页

作者： Junsheng Chen Jianfeng Huang Hai Wang Weihang Feng Tianmi Luo Yuzhu Hu Chengke Yuan Liyun Cao Yanni Jie Koji Kajiyoshi Yongqiang Feng School of Material science and Engineering International S&T Cooperation Foundation of Shaanxi ProvinceXi'an Key Laboratory of Green Manufacture of Ceramic MaterialsShaanxi University of Science and TechnologyXi'an 710021China Kochi University Research Laboratory of Hydrothermal ChemistryKochi 780-8520Japan

Hydrogen evolution reaction(HER)and oxygen reduction reaction(ORR)have been considered as two critical processes in the field of electrocatalytic water-splitting for hydrogen production and fuel ***,the sluggish reaction kinetics of HER and ORR required efficient electrocatalyst such as Pt to promote such *** metal phosphides(TMPs)exhibit great potential to replace noble metal electrocatalysts to accelerate HER and ORR due to their high activity and easy ***,a highly-efficient bifunctional CoP electrocatalyst for HER and ORR,featuring a unique core-shell structure decorated on nitrogen-doped carbon matrix was designed and constructed via etching a cobalt-based zeolitic imidazolate framework(ZIF-67)with phytic acid(PA)followed by pyrolysis treatment(PA-ZIF-67-900).Experimental results revealed that the pure-phase single-crystalline Co P exhibited outstanding electrocatalytic performance in HER and ORR,superior to Co(PO_(3))_(2) in PA-ZIF-67-700,hybrid phase of Co(PO_(3))_(2) and CoP in PA-ZIF-67-800 and Co_(2)P-doped CoP in *** reach the current density of 10 mA/cm^(2)the as-synthesized Co P required an overpotential of 120 m V for HER in 1 mol/L KOH and half-wave potential of 0.85 V in O_(2)-saturated 0.1 mol/L *** work present new clue for construction of efficient and bifunctional electrocatalyst in the field of energy conversion and storage.

关键词： Electrocatalyst Hydrogen evolution reaction Oxygen reduction reaction Transitional metal phosphide CoP

Spiking-free HGO-based DSC for flexible joint manipulator

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Chinese Journal of Aeronautics 2022年第3期35卷 419-431页

作者： Dezhi KONG Wendong WANG Yang WANG Junbo ZHANG Yikai SHI Lingyun KONG School of Mechanical Engineering Northwestern Polytechnical University Xi'an 710072China Shaanxi Engineering Research Center of Controllable Neutron Source School of ScienceXijing UniversityXi'an 710123China

The tracking control problem for Flexible Joint Manipulator Control System(FJMCS)with unmeasurable states is addressed in this ***,a High-Gain Observer(HGO)is constructed to estimate the unmeasurable states and the ***,a Dynamic Surface Control(DSC)scheme is developed by using the estimation of *** newly proposed controller has two advantages over the existing methods:(A)a novel Spike Suppression Function(SSF)is developed to avoid the estimation spike problem in the existing HGO-based controllers.(B)Unlike the existing observer-based partial feedback control scheme that can only estimate the unmeasurable states,the proposed HGO can estimate both the unmeasurable states and *** closed-loop system stability is proved by the Lyapunov *** results demonstrate the effectiveness of the proposed controller.

关键词： Dynamic surface control Flexible joint manipulator High-gain observer Mismatched uncertainties Partial states feedback Spike suppression

Fabrication of carbonized spent coffee grounds/graphene nanoplates/cyanate ester composites for superior and highly absorbed electromagnetic interference shielding performance

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Journal of Materials science & technology 2022年第7期102卷 123-131页

作者： Zhengzheng Guo Penggang Ren Zengping Zhang Zhong Dai Zhenxia Lu Yanling Jin Fang Ren School of Materials science and Engineering Xi’an University of TechnologyXi’an 710048China The Faculty of Printing Packaging Engineering and Digital Media TechnologyXi’an University of TechnologyXi’an 710048China Key Laboratory for Special Area Highway Engineering of Ministry of Education Chang’an UniversityXi’an 710064China

The conductive polymer composites(CPCs) with highly efficient electromagnetic interference(EMI)shielding effectiveness(SE) are always accompanied with excessive reflectivity, which would cause serious secondary EMI pollution. In this regard, the significant reduction of EMI reflection of CPCs to alleviate secondary pollution is deemed to be very important. Herein, a promising cyanate ester(CE) based composite was successfully fabricated by compounding carbonized spent coffee grounds(C-SCG) and graphene nanosheets(GNSs) via a facile solution blending followed by a hot-pressing method. Benefiting from the porous structure of C-SCG and the layered structure of GNSs, a three-dimensional(3 D)multi-interface conductive network in the CE was easily constructed. The EMI SE of the resultant 9 wt%C-SCG/CE composite(C9) is 15.38 d B and dramatically enhanced to 31.09 d B with the presence of 3 wt% GNSs. The remarkable enhancement is mainly attributed to the formation of the efficient conductive pathways as well as the well-dispersion of the incorporated fillers. Meanwhile, the absorption-dominated shielding mechanism in the prepared composites gets benefit from the synergistic effect of porous C-SCG and lamellar GNSs, which effectively captures and attenuates electromagnetic waves. These encouraging findings extend the practical applications of porous biocarbon materials in EMI shielding field.

关键词： Carbonized spent coffee grounds Graphene nanosheets Electromagnetic interference shielding Low reflection

Long‐time target tracking algorithm based on re‐detection multi‐feature fusion

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IET Cyber-Systems and Robotics 2022年第1期4卷 38-50页

作者： Junsuo Qu Chenxue Tang Yuan Zhang Kai Zhou Abolfazl Razi School of Automation Xi'an Key Laboratory of Advanced Control and Intelligent ProcessXi'an University of Posts and TelecommunicationsXi'anShaanxiChina School of Communication and Information Engineering Xi'an University of Posts and TelecommunicationsXi'anShaanxiChina School of Informatics Computing and Cyber SystemsNorthern Arizona UniversityFlagstaffAZUSA

This paper considers the problem of long-term target tracking in complex scenes when tracking failures are unavoidable due to illumination change,target deformation,scale change,motion blur,and other *** specifically,a target tracking algorithm,called re-detection multi-feature fusion,is proposed based on the fusion of scale-adaptive kernel correlation filtering and *** target tracking algorithm trains three kernel correlation filters based on the histogram of oriented gradients,colour name,and local binary pattern features and then obtains the fusion weight of response graphs corresponding to different features based on average peak correlation energy criterion and uses weighted average to complete the position estimation of the tracked *** order to deal with the problem that the target is occluded and disappears in the tracking process,a random fern classifier is trained to perform re-detection when the target is *** comparing the OTB-50 target tracking dataset,the experimental results show that the proposed tracker can track the target well in the occlusion attribute video sequence in the OTB-100 test dataset and has a certain improvement in tracking accuracy and success rate compared with the traditional correlation filter tracker.

关键词： machine learning pedestrian identification robustness visual surveillance visual tracking

Dual modulation of morphology and electronic structures of VN@C electrocatalyst by W doping for boosting hydrogen evolution reaction

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Chinese Chemical Letters 2022年第11期33卷 4781-4785页

作者： Danyang He Liyun Cao Liangliang Feng Shuainan Li Yongqiang Feng Guodong Li Yifei Zhang Jinhan Li Jianfeng Huang School of Materials science&Engineering International S&T Cooperation Foundation of Shaanxi ProvinceXi'an Key Laboratory of Green Manufacture of Ceramic MaterialsShaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsKey Laboratory of Auxiliary Chemistry and Technology for Chemical IndustryMinistry of EducationShaanxi University of Science&TechnologyShaanxi 710021China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China

Developing high-efficiency and robust durability electrocatalyst for hydrogen evolution reaction(HER)in water electrolysis functions as a crucial role for the construction of green hydrogen economy,herein,ultrafine W-doped vanadium nitride nanoparticles anchored on N-doped graphitic carbon framework(WVN@NGC)are synthesized through a one-step simple pyrolysis *** to the enlarged catalytically active sites,enhanced electrical conductivity and optimized electronic structure,the resultant VN/WN@NGC delivered the prominent HER performance with overpotentials of 143 mV and 158 mV at10 mA/cm^(2) in acid and alkaline media,respectively,accompanied by the long-term stability for at least50 *** work highlights a novel strategy for a metal-triggered modulation of nitride-based HER electrocatalyst for sustainable energy conversion device.

关键词： Tungsten doping Vanadium nitride Graphitic carbon Electronic structure Hydrogen evolution

A band-pass frequency selective surface with polarization rotation

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Chinese Physics B 2023年第2期32卷 281-285页

作者：林宝勤黄文准郭建新刘哲王衍文叶红军 School of Information Engineering Xijing UniversityXi'an 710123China

A band-pass frequency selective surface(FSS) with polarization rotation property is proposed. The proposed polarization rotating FSS(PR-FSS) is a two-dimensional periodic structure, its unit cell is an antenna-filter-antenna(AFA) module,and the polarization directions of the upper and lower antennas in each AFA module are orthogonal to each other, so the PR-FSS can achieve frequency selection and 90 degrees polarization rotation at the same time. The numerical simulation demonstrate that the anticipated frequency selection and polarization rotation are realized by the PR-FSS in the frequency band from 8.84 GHz to 10.30 GHz with a relative bandwidth of 15.26%, and the maximum insertion loss in the pass band is only 0.17 d B. Finally, one effective experiment validation is carried out, a reasonable agreement is observed between the experimental and simulated results except for a slight deviation caused by fabrication error and measurement tolerance.

关键词： frequency selective surface(FSS) polarization rotation band-pass