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Growth of BeO Nanograins Synthesized by Polyacrylamide Gel Route

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Journal of Materials Science & Technology 2011年第2期27卷 147-152页

作者： Xiaofeng wang Richu wang chaoqun Peng Tingting Li Bing Liu School of Materials Science and Engineering Central South UniversityChangsha 410083China

BeO nanoparticles were synthesized by polyacrylamide gel *** effects of the processing parameters on the morphology and size of the synthesized BeO nanoparticles were *** calcination temperature of the gel precursor containing beryllium sulfate was determined by thermogravimetry and differential scanning calorimetry（TG-DSC）,which is around 690 C and 160 C lower than the general *** diffractometry（XRD）,transmission electron microscopy（TEM）,and specific surface area measurements（BET） showed that the synthesized nanoparticles under 700 C were pure,globular and about ～5-20 nm with narrow ***,the nanograins coalesced and grew under higher calcination temperatures and longer calcination *** influence of calcination temperature on the morphology and growth behavior is greater than that of its *** activation energy for grain growth was estimated to be 24.53 kJ/mol,and the dominant growth mechanism was most likely to be related to the vapor transport in pore control mode and grain-rotation-induced grain coalescence（GRIGC） mechanism.

关键词： Nanograins BeO Grain growth Polycrylamide gel

LncRNA AFAP1-AS1 exhibits oncogenic characteristics and promotes gemcitabine-resistance of cervical cancer cells through miR-7-5p/EGFR axis

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Oncology Research 2024年第12期32卷 1867-1879页

作者： chaoqun wang TING ZHANG CHAOHE ZHANG Department of Gynecology Aviation General HospitalBeijing100020China Department of Burn and Skin Surgery First Affiliated Hospital of Air Force Military Medical UniversityXi’an710032China Department of Oncology and Hematology Second Hospital of Jilin UniversityChangchun130000China

Background:Drug resistance is the main factor contributing to cancer recurrence and poor *** of drug resistance-related mechanisms and effective therapeutic targets are the aim of molecular targeted *** our study,the role of long non-coding RNA(lncRNA)AFAP1-AS1 in gemcitabine resistance and related mechanisms were explored in cervical cancer ***:Gemcitabine-resistant cervical cancer cell lines HT-3-Gem and SW756-Gem were constructed using the gemcitabine concentration gradient *** overall survival rates and recurrence-free survival rates were evaluated by Kaplan-Meier *** interaction was veriﬁed through a Dual-luciferase reporter gene assay and a Biotinylated RNA pull-down *** proliferation ability was assessed through methyl-thiazolyl-tetrazolium(MTT),soft agar,and colony formation *** cycle and apoptosis were detected byﬂow ***:Up-regulation of AFAP1-AS1 in cervical cancer predicted a poor ***,patients in the gemcitabine-resistance group had higher levels of AFAP1-AS1 than the gemcitabine-sensitive ***1-AS1 promoted tumor growth and induced gemcitabine tolerance of cervical cancer *** addition,AFAP1-AS1 mediated epidermal growth factor receptor(EGFR)expression by serving as a molecular sponge for microRNA-7a-5p(miR-7-5p).This present study also proved that the knockdown of EGFR or overexpression of miR-7a-5p abolished the accelerative role of AFAP1-AS1 overexpression in cancer progression and gemcitabine ***:In general,the AFAP1-AS1/miR-7-5p/EGFR axis was tightly related to the progression and gemcitabine tolerance of cervical cancer,providing potential targets for the management of cervical cancer.

关键词： Long non-coding RNA(lncRNA)AFAP1-AS1 miR-7-5p Epidermal growth factor receptor(EGFR) Gemcitabine-resistance Cervical cancer

Photodegradable polar-functionalized polyethylenes

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National Science Review 2023年第7期10卷 124-133页

作者： chaoqun wang Jian Xia Yuxing Zhang Xiaoqiang Hu Zhongbao Jian State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences School of Applied Chemistry and Engineering University of Science and Technology of China

The degradation of plastics has attracted much attention from the global ***(PEs),as the most abundant synthetic plastics,are most frequently *** is non-degradable and non-polar because of the sole presence of the pure hydrocarbon *** incorporation of both in-chain cleavable and functional groups into the PE chain is an effective pathway to overcome the non-degradable and non-polar issue;however,the method for achieving this pathway remains ***,we report a strictly non-alternating(>99%) terpolymerization of ethylene with CO and fundamental polar monomers via a coordination-insertion mechanism using late transition metal catalysts,which effectively prevents the formation of undesired chelates originating from both co-monomers under a low CO ***-molecular-weight linear PEs with both in-chain isolated keto(>99%) and main-chain functional groups are *** incorporation of key low-content isolated keto groups makes PEs photodegradable while retaining their desirable bulk material properties,and the introduction of polar functional groups considerably improves their surface properties.

关键词： degradable plastic homogeneous catalysis C1 chemistry non-alternating copolymerization polyolefin

CNN Feature Boosted SeqSLAM for Real-Time Loop Closure Detection

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Chinese Journal of Electronics 2018年第3期27卷 488-499页

作者： BAI Dongdong wang chaoqun ZHANG Bo YI Xiaodong YANG Xuejun College of Computer National University of Defense Technology State Key Laboratory of High Performance Computing National University of Defense Technology National Institute of Defense Technology Innovation

This paper proposes an efficient and robust Loop closure detection(LCD) method based on Convolutional neural network(CNN) feature. The primary method is called SeqCNNSLAM, in which both the outputs of the intermediate layer of a pre-trained CNN and the outputs of traditional sequence-based matching procedure are incorporated, making it possible to handle the viewpoint and condition variance properly. An acceleration algorithm for SeqCNNSLAM is developed to reduce the search range for the current image, resulting in a new LCD method called A-SeqCNNSLAM. To improve the applicability of A-SeqCNNSLAM to new environments, O-SeqCNNSLAM is proposed for online parameters adjustment in A-SeqCNNSLAM. In addition to the above work, we further put forward a promising idea to enhance Seq SLAM by integrating the both CNN features and VLAD’s advantages called patch based Seq CNNSLAM(P-SeqCNNSLAM), and provide some preliminary experimental results to reveal its performance.

关键词： Simultaneous localization and mapping(SLAM) Loop closure detection(LCD) Convolutional neural network(CNN) SeqSLAM SeqCNNSLAM A-SeqCNNSLAM O-SeqCNNSLAM P-SeqCNNSLAM

Scene text removal via cascaded text stroke detection and erasing

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Computational Visual Media 2022年第2期8卷 273-287页

作者： Xuewei Bian chaoqun wang Weize Quan Juntao Ye Xiaopeng Zhang Dong-Ming Yan National Laboratory of Pattern Recognition Institute of AutomationBeijing 100049China School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100084China

Recent learning-based approaches show promising performance improvement for the scene text removal task but usually leave several remnants of text and provide visually unpleasant *** this work,a novel end-to-end framework is proposed based on accurate text stroke ***,the text removal problem is decoupled into text stroke detection and stroke removal;we design separate networks to solve these two subproblems,the latter being a generative *** two networks are combined as a processing unit,which is cascaded to obtain our final model for text *** results demonstrate that the proposed method substantially outperforms the state-of-the-art for locating and erasing scene text.A new large-scale real-world dataset with 12,120 images has been constructed and is being made available to facilitate research,as current publicly available datasets are mainly synthetic so cannot properly measure the performance of different methods.

关键词： scene text removal text stroke detection generative adversarial networks cascaded network design real-world dataset

A novel method for singularity analysis of the 6-SPS parallel mechanisms

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Science China(Technological Sciences) 2011年第5期54卷 1220-1227页

作者： CHENG ShiLi WU HongTao wang chaoqun YAO Yu ZHU JianYing College of Mechanical & Electrical Engineering Nanjing University of Aeronautics & Astronautics Nanjing 210016 China College of Engineering Nanjing Agricultural University Nanjing 210031 China College of Aerospace Engineering Nanjing University of Aeronautics & Astronautics Nanjing 210016 China

Singularity analysis is a basic problem of parallel mechanism, and this problem cannot be avoided in both workspace and motion planning. How to express the singularity locus in an analytical form is the research emphasis for many researchers for a long time. This paper presents a new method for the singularity analysis of the 6-SPS parallel mechanism. The rotation matrix is described by quaternion, and both the rotation matrix and the coordinate vectors have been expanded to four-dimensional forms. Through analyzing the coupling relationship between the position variables and the orientation variables, utilizing properties of the quaternion, eight equivalent equations can be obtained. A new kind of Jacobian matrix is derived from those equations, and the analytical expression of the singularity locus is obtained by calculating the determinant of the new Jacobian matrix. The singularity analysis of parallel mechanisms, whose moving platform actuated by 6 links and the vertices of both the base and the moving platforms has been placed on a circle respectively, can be solved by this analytical expression.

关键词： parallel mechanism singularity analysis quaternion Jacobian matrix

Old commercialized magnetic particles new trick: Intrinsic internal standard

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Chinese Chemical Letters 2022年第3期33卷 1267-1270页

作者： chaoqun wang Ziqiang Deng Hu Zhang Rui Liu Yi Lv Analytical&Testing Center Sichuan UniversityChengdu 610064China Key Laboratory of Green Chemistry and Technology of Ministry of Education College of ChemistrySichuan UniversityChengdu 610064China Department of Gastroenterology West China HospitalSichuan UniversityChengdu 610041China

Magnetic particles (MPs) are the most widely used commercialized engineering particles, which gained great success in various biological applications. Inspired by their intrinsic Fe isotope composition, we discovered a commercialized MPs-internal standard's novel function to realize the accurate quantification of biomolecules. The bioassay of carcinoembryonic antigen (CEA) was chosen as a modal system. The Fe isotope in MPs and Au isotope in report probes were simultaneously and sensitively detected by the elemental mass spectrometry. ^(197)Au/^(57)Fe isotopic ratios and CEA concentrations showed good linearity in the range of 0.6-300 ng/mL, with a detection limit of 0.09 ng/mL (3σ). The accuracy and precision of the proposed MPs-based immunoassay were greatly improved, by eliminating potential MPs loss during magnetic separation and absolute intensity fluctuations. Considering the exceptional availability and universality of commercialized MPs, the proposed method might open a new avenue for MPs' biological applications.

关键词： Magnetic particles Ratiometric Immunoassay ICPMS Carcinoembryonic antigen

Learning cross-modal interaction for RGB-T tracking

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Science China(Information Sciences) 2023年第1期66卷 320-321页

作者： Chunyan XU Zhen CUI chaoqun wang Chuanwei ZHOU Jian YANG Key Laboratory of Intelligent Perception and Systems for High-Dimensional Information of Ministry of Education School of Computer Science and Engineering Nanjing University of Science and Technology

Dear editor,Visual object tracking, which has attracted increasing attention in the field of general visual understanding, aims to track each temporally changing object in a video sequence, with the target specified only in the first *** most tracking algorithms have facilitated significant advances in RGB video sequences, object tracking using only RGB information is unreliable under extreme lighting conditions(e.g., dark night, rain, and foggy).

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Frost Resistance of Pervious Concrete Mixed with Waste Glass Powder

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1325-1336页

作者： AN Baofeng LI Qiong QIAO Hongxia SU Rui wang Xi wang chaoqun JIAO Daowei School of Civil Engineering Lanzhou University of TechnologyLanzhou 730050China Gansu Advanced Civil Engineering Materials Engineering Research Center Lanzhou 730050China China Construction First Group The Fifth Construction Co.Ltd Beijing 100000China

The contents of waste glass powder(WGP)(0%,10%,15%,20%,25%)and water-binder ratio(W/C)(0.24,0.26,0.28)were used as influencing factors,and the quality loss rate(Δm)and compressive strength loss rate(Δfc)were used as characterization *** Ca/Si ratio and main element contents of C-S-H gels with different WGP content were investigated by energy dispersive spectrometry(EDS).The pore structure evolution characteristics of WGP composite cementing materials were investigated by low field nuclear magnetic resonance(NMR).UsingΔfc as the index of frost resistance degradation and Weibull function,the frost resistance degradation of glass doped pervious concrete(WGP-PC)was *** results show that,with WGP,for the same number of cycles,Δm andΔfc decrease and increase with the increase of *** the same WGP content,Δm andΔfc decrease first and then increase with the increase of W/*** 100 freeze-thaw cycles,the samples with WGP content of 20%and W/C of 0.26 have the best *** tests show that with the increase of WGP content,the Ca/Si ratio of C-S-H gel decreases at first and then increases with the increase of WGP *** extreme value of Ca/Si is 2.36 when WGP is added by 20%.The pore volume of hardened paste with 20%WGP content decreased by 18.6%compared with that of cement system without *** overall compactness of the specimen was *** the basis of the test data,a life prediction model was established according to Weibull *** experiment showed thatΔfc could be used as a durability degradation index,and the slope of the reliability curve became gentle after WGP was added,which reduced the damage degradation rate of PC.W/C was ***'s about 5000 hours.

关键词： pervious concrete glass powder frost resistance energy dispersive analysis test low field nuclear magnetic resonance instrument life prediction