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Brominated Butyl Rubber Anticorrosive Coating and its Self-healing Behaviors

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Chinese Journal of Polymer Science 2023年第2期41卷 297-305页

作者： guang-Bing Luo Bo Pang Xing-Qi Luo Yi Wang hong Zhou Li-Juan zhao College of Chemistry and Materials Science Sichuan Normal UniversityChengdu610066China The Second Research Institute of Civil Aviation Administration of China(CAAC) Chengdu610041China

Self-healing anticorrosive coatings in extreme environment have attracted considerable interest from *** this work,4-tert-butylpyridine(TBP)was incorporated into brominated butyl rubber(BIIR)polymer networks to form a reversible ionic bond with the highly reactive bromine *** on the low glass transition temperature of the BIIR polymer and the electrostatic effects,a robust self-healing anticorrosive coating of TBP-BIIR was ***-BIIR coating showed a maximum protection efficiency(PE)of more than 94%(TBP-BIIR-acid,94.37%;TBP-BIIR-alkali,94.95%;TBP-BIIR-salt,95.49%)when treated with a strong acid(HNO_(3),pH=2),strong base(NaOH,pH=12)and high salt solution(3.5 wt%NaCl).In addition,the PE of coating repaired exceed 89%,and the maximum PE value was approximately 95%in different solutions,which demonstrated its extinguished self-healing *** results indicated that the TBP-BIIR anticorrosive coating could provide excellent safety and durability in special environment,which would be extremely beneficial to improve the working life of metal parts used in aviation and shipping,oil and gas and related industries.

关键词： Brominated butyl rubber Self-healing Anticorrosive Coating

Numerical Study of Collision and Penetration Behavior Between Particles and Screen Plate

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Journal of China University of Mining and Technology 2006年第2期16卷 137-140,146页

作者： JIAO hong-guang zhao Yue-min WANG Quan-qiang School of Material Science and Engineering Henan Polytechnic University Jiaozuo Henan 454003 China School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

For a screening process, the collision and penetration phenomena between particles and screen plate is standard behavior and with collision the mechanical energy of the vibrating screen can be transmitted to the feed. In order to recognize further the collision process and the law of penetrating motion, with the spring-dashpot-slider contact model of the distinct element method （DEM）, a mathematical model which can describe the collision process has been established and a program for simulating the motion of a single particle on the screen plate developed by VC＋＋. NET. To evaluate the handling capacity of the screen that deals with difficult screening material, an instantaneous penetrating coefficient is defined. The moving period of the screen plate is divided into four stages. By analyzing the state of contact collision at each stage, it is pointed out that the collision ranging from 3π/2 to 2π period is the most favorable aperture for penetration of particles, while the collision ranging from π/2 to n period is the most unfavorable. The numerical simulation result further indicates that increasing the amplitude of the screen plate has a much greater effect on the augmentation of instantaneous penetration coefficient than increasing the vibration frequency.

关键词： screening numerical simulation particle motion collision

A medical robot for needle placement therapy in liver cancer

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第4期11卷 263-269页

作者： Xing-guang DUAN Gui-bin BIAN hong-hua zhao Xing-tao WANG Qiang HUANG Intelligent Robotics Institute Beijing Institute of Technology Beijing 100081 China

Hepatocellular carcinoma (HCC) is the second most common malignancy in *** microwave ablation (MWA) is an effective method for liver cancer,a robotic surgical system with ultrasound-directed was designed to assist surgeons on positioning the *** robotic system includes a surgical robot with 5 degrees of freedom,a workstation for path-planning and image processing,a conventional 2D ultrasound device,and an electromagnetic (EM) tracking *** space,clinical operation requirements and optimal mechanical structure are the key factors to be considered in designing a medical robot suitable for use by *** on the mechanics of the needle placement robot,we have conducted detailed kinematic analysis,including a combined numerical algorithm and coordinate ***,the feasibility of the needle placement robot has been validated by experiment.

关键词： Surgical robot Needle insertion Inverse kinematics Numerical solution

Icotinib plus gemcitabine for metastatic pancreatic cancer:A case report

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World Journal of Gastroenterology 2015年第11期21卷 3441-3446页

作者： Jing zhao hong Shen Han-guang Hu Jian-Jin Huang Department of Medical Oncology The Second Affiliated HospitalZhejiang University School of Medicine

A large majority of patients diagnosed with pancreatic cancer have advanced metastatic disease with unresectable *** treatment advances,the survival benefit from chemotherapeutic regimens and targeted drugs is ***,their application is limited in China because of high toxicity and ***,inhibitors of epidermal growth factor receptor activity have shown promise for the treatment of solid cancers when used in combination with standard ***,these drugs have not been evaluated extensively for the treatment of pancreatic ***,we report the treatment of a 64-year-old male with metastatic pancreatic cancer using a novel regimen of icotinib with *** shrinkage of the mass was observed after two treatment cycles,and partial remission was *** abdominal pain was *** adverse effects were tolerable and treatment cost was *** is the first reported case for the treatment of advanced pancreatic cancer with icotinib plus gemcitabine and demonstrates a promising therapeutic alternative.

关键词： Epidermal growth factor receptor tyrosine kinase i

Fully actuated system approach to attitude control of flexible spacecraft with nonlinear time-varying inertia

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Science China(Information Sciences) 2022年第11期65卷 148-162页

作者： Tianyi zhao guang-Ren DUAN Center for Control Theory and Guidance Technology Harbin Institute of Technology

A high-order fully actuated(HOFA) system approach is proposed for the attitude control problem of a flexible spacecraft with nonlinear and time-varying inertia. Different from most existing results,the proposed method guarantees a linear time-invariant closed-loop system with arbitrarily assignable eigenvalues. Firstly, the HOFA model for the attitude system is derived from the original dynamic equations of the system by using state transformation and variable elimination. Then, by using the full-actuation characteristics of the obtained HOFA system, the nonlinearity in the system is completely canceled and a linear time-invariant system with arbitrarily assignable eigenvalues is derived. Finally, the control laws are designed for both problems of attitude stabilization and attitude maneuvering, and simulations are carried out based on practical engineering parameters, which demonstrate the effects of the proposed method.

关键词： high-order fully actuated system flexible spacecraft time-varying nonlinear systems attitude stabilization attitude maneuvering

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Investigation of the spike-stall warning method using the blade passing signal

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Science China(Technological Sciences) 2018年第6期61卷 830-842页

作者： zhao JiaYi XI guang WANG ZhiHeng zhao Yang School of Energy and Power Engineering Xi＇an Jiaotong University Xi ＇an 710049 China

The vaned-diffuser usually brings compressor instability problems under the small flow rate, for instance the spike-type rotating stall phenomenon which restricts the operation range and may cause the trouble of blade fatigue. Since it is difficult to mathematically predict the spike-type stall for its randomness, finding out a practical method to warning this stall precursor appears to be meaningful. The paper explains the relationship between the spike-type precursor and the blade passing irregularity coefficient to analyze whether this coefficient is appropriate for the spike-stall warning inside a centrifugal compressor with the vaned-diffuser. The advanced wireless measurements were conducted on a 1.5 stages test centrifugal compressor to capture the unsteady behavior progressing from the design to stall inception within the region between the impeller trailing edge(TE) and diffuser leading edge(LE). The circumferential distribution of the blade passing irregularity has been quantitatively *** steep increase of the blade passing irregularity at some "special locations", which is responsible for the onset of the spiketype precursor, is highlighted. Also, to further understand the spike precursor inside the diffuser passage corresponding to the circumferential "special location" with maximum irregularity, the high-response transient measurement within this passage is presented. With the help of full-annulus computational fluid dynamics(CFD) simulation and the mathematical model, it is proved that the blade passing irregularity precisely reflects the flow characteristics during the spike precursor, which presents the guidance for this stall warning method.

关键词： centrifugal compressor transient measurement stall warning blade passing irregularity coefficient

FedFV: A Personalized Federated Learning Framework for Finger Vein Authentication

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Machine Intelligence Research 2023年第5期20卷 683-696页

作者： Feng-zhao Lian Jun-Duan Huang Ji-Xin Liu guang Chen Jun-hong zhao Wen-Xiong Kang School of Automation Science and Engineering South China University of TechnologyGuangzhou 510641China GRG Banking Equipment Co.Ltd. Guangzhou 510663China School of Automation Guangdong University of Petrochemical TechnologyMaoming 525000China

Most finger vein authentication systems suffer from the problem of small sample ***,the data augmentation can alleviate this problem to a certain extent but did not fundamentally solve the problem of category *** the researchers resort to pre-training or multi-source data joint training methods,but these methods will lead to the problem of user privacy *** view of the above issues,this paper proposes a federated learning-based finger vein authentication framework(FedFV)to solve the problem of small sample size and category diversity while protecting user *** training under FedFV,each client can share the knowledge learned from its user′s finger vein data with the federated client without causing template *** addition,we further propose an efficient personalized federated aggregation algorithm,named federated weighted proportion reduction(FedWPR),to tackle the problem of non-independent identically distribution caused by client diversity,thus achieving the best performance for each *** thoroughly evaluate the effectiveness of FedFV,comprehensive experiments are conducted on nine publicly available finger vein *** results show that FedFV can improve the performance of the finger vein authentication system without directly using other client *** the best of our knowledge,FedFV is the first personalized federated finger vein authentication framework,which has some reference value for subsequent biometric privacy protection research.

关键词： Finger vein personalized federated learning privacy protection biometric authentication.

Application of rare-earth element Y in refining impure copper

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International Journal of Minerals,Metallurgy and Materials 2015年第5期22卷 453-459页

作者： Hai-hong Li Xue-qin Sun Shang-zhou Zhang Qin-yi zhao guang-zhen Wang School of Environment and Materials Engineering Yantai University

The effects of rare-earth element Y in refining impure copper were investigated in this paper. The composition, microstructures, and corrosion resistance properties of impure copper before and after refinement with Y were investigated using direct-reading spectrometry, inductively coupled plasma atomic emission spectrometry, optical microscopy, scanning electron microscopy, and potentiodynamic polariza- tion measurements. The results show that the concentrations of impurities S, As, Sb, Bi, A1, Cd, and Se are remarkably decreased. Adding an appropriate amount of Y refines the microstructure and enhances the corrosion resistance properties of impure copper in HC1 solution via a purification effect. The formation enthalpies of compounds formed between Y and various impurity elements were calculated on the basis of Miedema＇s theory. The thermodynamic mechanisms of the refinement of impure copper by Y were also discussed.

关键词： copper refining yttrium addition impurities removal microstructure corrosion resistance

Local Structure Determination of Mn^(2+)-Doped Fluoride Crystals by Superhyperfine Splitting Measurements

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Chinese Physics Letters 1998年第1期15卷 43-45页

作者： zhao Min-guang Institute of Solid State Physics Sichuan Normal UniversityChengdu 610068

A procedure is presented for the calculation of the Mn^(2+)-F^(-) bond length from the superhyperfine constants measured by magnetic resonance *** the present technique it is possible to detect the variation of the bond length,ΔR,down to 0.01Å.The technique is sensitive enough to determine the bond length R and its variationΔR experienced when pressure or temperature changes.

关键词： hyperfine constants bond