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World Journal of Clinical Cases 2021年第31期9卷 9577-9583页

作者： guo-feng liu Xiao-Ze Wang Xue-feng Luo Department of Gastroenterology and Hepatology Sichuan University-University of Oxford Huaxi Joint Centre for Gastrointestinal CancerWest China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina

BACKGROUND Hepatic encephalopathy(HE)is a frequent and debilitating complication of chronic liver *** HE is strongly linked with spontaneous portosystemic shunts(SPSSs).Intrahepatic arterioportal fistulas(IAPFs)occur rarely but pose a major clinical challenge and may lead to or worsen portal ***,we present a rare case of recurrent HE secondary to a SPSS combined with an *** SUMMARY A 63-year-old female with primary biliary cirrhosis presented with recurrent disturbance of consciousness for 4 *** communicating the superior mesenteric vein with the inferior vena cava and IAPF linking the intrahepatic artery with the portal vein were found on contrast-enhanced abdominal computed *** patient did not respond well to medical ***,simultaneous embolization of SPSS and IAPF was *** embolization,the symptoms of HE showed obvious *** The presence of liver vascular disorders should not be neglected in patients with chronic liver disease,and interventional therapy is a reasonable choice in such patients.

关键词： Spontaneous portosystemic shunts Intrahepatic arterioportal fistula Endovascular embolization Hepatic encephalopathy Liver disease Case report

Acute extensive portal and mesenteric venous thrombosis after splenectomy:Treated by interventional thrombolysis with transjugular approach

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World Journal of Gastroenterology 2009年第24期15卷 3038-3045页

作者： Mao-Qiang Wang Han-Ying Lin Li-Ping guo feng-Yong liu feng Duan Zhi-Jun Wang Department of Interventional Radiology Chinese PLA General Hospital Beijing 100853 China

AIM:To present a series of cases with symptomatic acute extensive portal vein(PV)and superior mesenteric vein(SMV)thrombosis after splenectomy treated by transjugular intrahepatic approach catheter-directed thrombolysis. METHODS:A total of 6 patients with acute extensive PV-SMV thrombosis after splenectomy were treated by transjugular approach catheter-directed thrombolysis. The mean age of the patients was 41.2 *** access to the portal system via the transjugular approach,pigtail catheter fragmentation of clots, local urokinase injection,and manual aspiration thrombectomy were used for the initial treatment of PV-SMV thrombosis,followed by continuous thrombolytic therapy via an indwelling infusion catheter in the SMV,which was performed for three to six days. Adequate anticoagulation was given during treatment, throughout hospitalization,and after discharge. RESULTS:Technical success was achieved in all 6 *** improvement was seen in these patients within 12-24 h of the *** complications were *** 6 patients were discharged 6-14 d(8±2.5 d)after *** mean duration of follow-up after hospital discharge was 40±16.5 *** and contrast-enhanced computed tomography confirmed patency of the PV and SMV,and no recurrent episodes of PV-SMV thrombosis developed during the follow-up period. CONCLUSION:Catheter-directed thrombolysis via transjugular intrahepatic access is a safe and effective therapy for the management of patients with symptomatic acute extensive PV-SMV thrombosis.

关键词： Mechanical thrombectomy Portal vein Splenectomy Superior mesenteric vein Thrombolysis Thrombosis

Analysis of photonic crystal fiber sensor character

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Optoelectronics Letters 2007年第3期3卷 199-202页

作者： guo Xuan liu feng BI Wei-hong College of lnformation Science and Engineering Yanshan University Qinhuangdao 066004 China

The special character of a PCF which is used as a gas or liquid sensor is discussed. The field distribution is analyzed when the solid core PCF is injected with different medium that has different relative dielectric constant （or refractive index）. And the experiential formulas of the relation between refractive index of some kinds of liquid and their concentration are given, in order to measure the concentration of the relative liquid. At the same time, the effect of propagation constant on PCF sensor character is also discussed. Furthermore, the photonic medium relative dielectric constant, when it is injected with . band-gap （PBG） of PCF （PBG-PCF） is calculated at different different medium. That is the principle basis for this kind of PCF sensors.

关键词：光子晶体光纤传感器性能分析介电常数

Functional imaging and endoscopy

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World Journal of Gastroenterology 2011年第38期17卷 4277-4282页

作者： Jian-guo Zhang Hai-feng liu Department of Gastroenterology General Hospital of Chinese Armed Police Forces Beijing 100039 China

The emergence of endoscopy for the diagnosis of gastrointestinal diseases and the treatment of gastrointestinal diseases has brought great *** mere observation of anatomy with the imaging mode using modern endoscopy has played a significant role in this ***,increasing numbers of endoscopies have exposed additional deficiencies and defects such as anatomically similar *** can be used to examine lesions that are difficult to identify and *** disease detection requires that substantive changes in biological function should be observed,but in the absence of marked morphological changes,endoscopic detection and diagnosis are *** detection requires not only anatomic but also functional imaging to achieve a comprehensive interpretation and ***,we must ask if endoscopic examination can be integrated with both anatomic imaging and functional *** recent years,as molecular biology and medical imaging technology have further developed,more functional imaging methods have *** paper is a review of the literature related to endoscopic optical imaging methods in the hopes of initiating integration of functional imaging and anatomical imaging to yield a new and more effective type of endoscopy.

关键词： Endoscopy Functional imaging Multi-modal imaging Optical coherence tomography Fluores-cence molecular imaging Photoacoustic tomography Cerenkov luminescence tomography

Precise Asymptotics of Error Variance Estimator in Partially Linear Models

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Acta Mathematicae Applicatae Sinica 2008年第1期24卷 59-74页

作者： Shao-jun guo, Min Chen, feng liu Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing 100080, China Department of Statistics, Chongqing Institute of Technology, Chongqing 630000, China Academy of Mathematics Systems Science Chinese Academy of Sciences Beijing 100080 China Department of Statistics Chongqing Institute of Technology Chongqing 630000 China

In this paper, we focus our attention on the precise asymptotics of error variance estimator in partially linear regression models, yi = xiτβ+ g(ti) +εi, 1≤i≤n, {εi,i = 1,…, n} are i.i.d random errors with mean 0 and positive finite varianceσ2. Following the ideas of Allan Gut and Aurel Spatarut and Zhang, on precise asymptotics in the Baum-Katz and Davis laws of large numbers and precise rate in laws of the iterated logarithm, respectively, and subject to some regular conditions, we obtain the corresponding results in partially linear regression models.

关键词： Precise asymptotics partially linear models error variance estimator

Seismic imaging based on spectral differentiation matrix and GPU implementation

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Seismic imaging based on spectral differentiation matrix and...

Electrochemical extraction of lead from urea-1-ethyl-3-methylimidazolium fluoride system containing PbO at 353 K

中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： Jing-Bo Chen guo-feng liu Hong liu Key laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of Sciences

Finite-difference depth migration based on one-way wave equation uses second-order,fourth-order,or other finite-order approximations for spatial *** finite-order approximations often lead to spatial dispersion errors and low *** avoid these errors,smaller mesh spacings are used,which results in huge increase in computation *** this paper,we develop a new spectral differentiation matrix method for approximating spatial *** approximation of spectral differentiation matrix is of infiniteorder, and therefore avoids dispersion errors and increases accuracy by using a smaller number of grid points. Recently-developed GPU computational technology is well suited to the seismic migration based on frequency-domain wavefield-continuation methods because such approaches can be sufficiently decoupled. We present a frequency-domain wavefield-continuation algorithm based on spectral differentiation matrix, and realize GPU implementation of this new algorithm on Marmousi model.

关键词： Seismic migration Imaging Spectral differentiation GPU

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Transactions of Nonferrous Metals Society of China 2021年第4期31卷 1140-1150页

作者： Wen-cai HE feng-guo liu Xiong-wei ZHONG Shan YANG Zhong-ning SHI Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China Department of Chemistry Physics and Atmospheric ScienceJackson State UniversityJacksonMS 39217USA Shenzhen Geim Graphene Center Tsinghua−Berkeley Shenzhen Institute&Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

To electrochemically extract Pb from PbO at room temperature, a new electrolyte, urea-1-ethyl-3-methylimidazolium fluoride(urea-[EMIM]F), was synthesized to dissolve PbO. Afterwards, the electrochemical behavior of Pb in this electrolyte was studied. The density, viscosity and conductivity of this electrolyte were investigated before electroextraction. The electrochemical behavior of Pb in the urea-[EMIM]F system was recorded via cyclic voltammograms, chronoamperometry and potentiostatic electrolysis. The results illustrate that Pb can be electrochemically extracted from PbO in this system at room temperature and that Pb reduction involves a quasireversible process and follows a one-step and two-electron transfer process. The reduction of Pb proceeds with a three-dimensional(3 D) progressive model. With an increase in temperature, the onset potentials for Pb reduction shift anodically. The diffusion coefficient of Pb(II) is determined to be 6.88×10-10 cm2/s at 353 K. Additionally, spherical Pb particles are obtained after electrodeposition in the urea-[EMIM]F system via potentiostatic electrolysis.

关键词： Pb ionic liquids imidazolium fluoride electrodeposition viscosity

Physicochemical properties of 1,3-dimethyl-2-imidazolinone−ZnCl_(2)solvated ionic liquid and its application in zinc electrodeposition

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Transactions of Nonferrous Metals Society of China 2021年第3期31卷 832-841页

作者： Ai-min liu Meng-xia guo Zhong-ning SHI Yu-bao liu feng-guo liu Xian-wei HU You-jian YANG Wen-ju TAO Zhao-wen WANG Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China

Zinc chloride(ZnCl_(2))was dissolved in the 1,3-dimethyl-2-imidazolinone(DMI)solvent,and the metallic zinc coatings were obtained by electrodeposition in room-temperature ambient *** conductivity(σ),viscosity(η),and density(ρ)of the DMI−ZnCl_(2)solvated ionic liquid at various temperatures(T)were measured and ***,cyclic voltammetry was used to study the electrochemical behavior of Zn(II)in the DMI−ZnCl_(2)solvated ionic liquid,indicating that the reduction of Zn(II)on the tungsten electrode was a one-step two-electron transfer irreversible *** and SEM−EDS analysis of the cathode product confirmed that the deposited coating was metallic ***,the effects of deposition potential,temperature and duration on the morphology of zinc coatings were *** results showed that a dense and uniform zinc coating was obtained by potentiostatic electrodeposition at−2 V(vs Pt)and 353 K for 1 h.

关键词： electrodeposition zinc 1,3-dimethyl-2-imidazolinone physicochemical properties cyclic voltammetry

Physicochemical properties of DMI-LiNO_(3) solvated ionic liquid and its application in electrodeposition of neodymium at room temperature

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Transactions of Nonferrous Metals Society of China 2021年第8期31卷 2522-2531页

作者： Ai-min liu Yu YAO Meng-xia guo Yu-bao liu Zhong-ning SHI feng-guo liu Xian-wei HU Wen-cai HE Zhao-wen WANG Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

The density,conductivity,and viscosity of the 1,3-dimethyl-2-imidazolinone and lithium nitrate(DMILiNO_(3))solvated ionic liquid were measured as a function of ***,the electrochemical mechanism and electrodeposition of neodymium from the DMI-LiNO_(3) solvated ionic liquid were *** voltammetry results indicate that the electrochemical reduction of Nd(Ⅲ)is irreversible and proceeds via one-step with three-electron transfer,which is controlled by diffusion with a diffusion coefficient of 5.08×10^(-8) cm^(2)/*** X-ray spectrometry and X-ray photoelectron spectroscopy data confirm that the electrodeposit obtained after electrodeposition at-4 V(vs Ag)using the DMI-LiNO_(3)-Nd(CF_(3)SO_(3))_(3) solvated ionic liquid contains metallic neodymium.

关键词： electrodeposition neodymium ionic liquid physicochemical properties cyclic voltammetry

Electrochemical behavior of tantalum in ethylene carbonate and aluminum chloride solvate ionic liquid

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Transactions of Nonferrous Metals Society of China 2020年第8期30卷 2283-2292页

作者： Ai-min liu Meng-xia guo Zi-yang LÜ Bao-guo ZHANG feng-guo liu Wen-ju TAO You-jian YANG Xian-wei HU Zhao-wen WANG Yu-bao liu Zhong-ning SHI Key Laboratory for Ecological Metallurgy of Multimetallic Mineral Ministry of EducationNortheastern UniversityShenyang 110819China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

To investigate the electrochemical reduction mechanism of Ta(Ⅴ)in ethylene carbonate and aluminum chloride(EC-AlCl3)solvate ionic liquid,cyclic voltammetry experiments were conducted on a tungsten working *** reduction peaks were observed in the cyclic voltammogram of the EC-AlCl3-TaCl5 ionic *** reduction peaks at-0.55,-0.72,and-1.12 V(vs Al)were related to the reduction of Ta(Ⅴ)to tantalum metal by three stages including the formation of Ta(Ⅳ)and Ta(Ⅲ)complex *** reduction of Ta(Ⅲ)to tantalum metal was an irreversible diffusion-controlled reaction with a diffusion coefficient of 3.7×10^-7 cm^2/s at 323 K,and the diffusion activation energy was 77 k J/***,the cathode products at 323 K were characterized by scanning electron microscopy,energy-dispersive spectroscopy,and X-ray photoelectron *** results showed that tantalum metal and tantalum oxides were obtained by potentiostatic electrodeposition at-0.8 V for 2 h.

关键词： electrochemical behavior ionic liquid cyclic voltammetry aluminum chloride tantalum