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Effect of water injection on hydrogen generation during severe accident in PWR

Nuclear Science and Techniques 2009年第5期20卷 312-316页

作者： tao jun cao Xuewu School of Mechanical and Power Engineering Shanghai Jiao Tong University Shanghai 200240 China

Effect of water injection on hydrogen generation during severe accident in a 1000 MWe pressurized water reactor was studied. The analyses were carried out with different water injection rates at different core damage stages. The core can be quenched and accident progression can be terminated by water injection at the time before cohesive core debris is formed at lower core region. Hydrogen generation rate decreases with water injection into the core at the peak core temperature of 1700 K, because the core is quenched and reflooded quickly. The water injection at the peak core temperature of 1900 K, the hydrogen generation rate increases at low injection rates of the water, as the core is quenched slowly and the core remains in uncovered condition at high temperatures for a longer time than the situation of high injection rate. At peak core temperature of 2100–2300 K, the Hydrogen generation rate increases by water injection because of the steam serving to the high temperature steam-starved core. Hydrogen generation rate increases significantly after water injection into the core at peak core temperature of 2500 K because of the steam serving to the relocating Zr-U-O mixture. Almost no hydrogen generation can be seen in base case after formation of the molten pool at the lower core region. However, hydrogen is generated if water is injected into the molten pool, because steam serves to the crust supporting the molten pool. Reactor coolant system (RCS) depressurization by opening power operated relief valves has important effect on hydrogen generation. Special attention should be paid to hydrogen generation enhancement caused by RCS depressurization.

关键词： PWR 核技术研究发展 RCS

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Capillary electrophoresis with electrochemiluminescence detection for the analysis of quinolone drugs and pharmacokinetics study

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Chinese Chemical Letters 2008年第8期19卷 962-964页

作者： Yan Ming Liu jun tao cao Hui Wang College of Chemistry and Chemical Engineering Xinyang Normal University Xinyang 464000 China

A novel method for the determination of two quinolone drugs norfloxacin （NOR） and levofloxacin （LVX） was described by capillary electrophoresis with electrochemiluminescence detection. The good relationship （r ≥ 0.9991） between peak area and concentration of analytes was established over two orders of magnitude. The limits of detection （LOD, S/N = 3） in standard solution are 4.8 × 10^-7 mol/L for NOR and 6.4 × 10^-7 mol/L for LVX, respectively. The limits of quantitation （LOQ, S/N = 10） in real human urine samples are 1.2 × 10^-6 mol/L for NOR and 1.4 × 10^-6 mol/L for LVX, respectively. The present method was successfully applied to the determination of NOR and LVX in human urine and the studv of oharmacokinetics of NOR.

关键词： Capillary electrophoresis Electrochemiluminescence detection Quinolone drugs Urine analysis Pharmacokinetics

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Comparison between double caliper,imaging logs,and array sonic log for determining the in-situ stress direction:A case study from the ultra-deep fractured tight sandstone reservoirs,the Cretaceous Bashijiqike Formation in Keshen8 region of Kuqa depress

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Petroleum Science 2022年第6期19卷 2601-2617页

作者： Song Wang Gui-Wen Wang Dong Li Xing-Neng Wu Xu Chen Qi-Qi Wang jun-tao cao Yi-Lin Zhang State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum BeijingBeijing102249China College of Geosciences China University of Petroleum BeijingBeijing102249China Research Institute of Petroleum Exploration and Development Tarim Oilfield CompanyCNPCKorla841000XinjiangChina Department of Geological Sciences University of Texas at Austin2275 Speedway Stop C9000AustinTX78712USA

The tight sandstone in the Tarim Basin has the characteristics of large burial depth and development of nature fractures due to concentrated in-situ stress. Identifying the present-day in-situ stress orientation is important in hydrocarbon exploration and development, but also a key scientific question in understanding naturally fractured reservoirs. This paper presents a case study where we integrate various methods using wireline and image-log data, to identify present-day in-situ stress direction of ultra-deep fractured tight sandstone reservoirs, in the Kuqa depression. We discuss the formation mechanism of the elliptical borehole, compares the advantages and applicable conditions of the double caliper method,resistivity image logs and array sonic logs method. The well borehole diameter is measured orthogonally,then the ellipse is fitted, and the in-situ stress orientation is identified by the azimuth of the short-axis borehole, but it fails in the borehole expansion section, the fracture development section and the borehole collapse section. The micro-resistivity image logs method reveals the borehole breakouts azimuth, and also the strike of induced fractures, which are used to determine the orientation of in-situ stress. However, under water-based mud conditions, it’s hard to distinguish natural fractures from induced fractures by image logs. Under oil-based mud conditions, the induced fractures are difficult to identify due to the compromised image quality. As for the sonic log, shear waves will split when passing through an anisotropic formation, shear waves will split during propagation, and the azimuth of fast shear waves is consistent with the orientation of in-situ stress. However, it is usually affected by the anisotropy caused by the excessively fast rotation of the well log tools, so that the azimuth of fast shear wave cannot effectively reflect the orientation of the in-situ stress. Based on comprehensive assessment and comparison, in this paper we

关键词： Fractured tight sandstone In-situ stress Orientation Well logs

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A label-free electrochemiluminescence immunosensor based on CdS–MoS2 composites for detection of cardiac troponin Ⅰ

A label-free electrochemiluminescence immunosensor based on ...

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河南省化学会2018年学术年会

作者： Fang Hou jun-tao cao Yan-Ming Liu College of Chemistry and Chemical Engineering Xinyang Normal University

A label-free electrochemiluminescence(ECL) immunosensor based on CdS-MoS composites as efficient luminescent material and sensing platform is fabricated for the detection of the acute myocardial infarction biomarker cardiac troponin I(cTnI). The CdS-MoS composites was synthesized by hydrothermal method, it has excellent luminescent properties. Owing to layer by layer modification of immunosensor, electron transfer is blocked between luminescent materials and coreactants, and the ECL signal gradually decreased. The immunosensor showed a wide linear detection range of 5.0 pg m L-1 to 100.0 ng mL-1 with a detection limit of 1.0 pg mL-1. The method has been successfully applied to the determination of cTnI in human serum samples. The proposed strategy can also be applied to the detection of other biomarkers.

关键词： Electrochemiluminescence CdS-MoS2 composites Cardiac troponin I

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CdS:Mn quantum dots-sensitized two-dimensional layered g-C3N4-MoS2 heterojunction for photoelectrochemical immunosensing coupled with polyclonal antibody CuO conjugates as signal amplification tags

CdS:Mn quantum dots-sensitized two-dimensional layered g-C3N...

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河南省化学会2018年学术年会

作者： Yan Ma jun-tao cao Yan-Ming Liu College of Chemistry and Chemical Engineering Xinyang Normal University

A sensitive signal-off photoelectrochemical(PEC)sensing platform for myoglobin(Myo)detection based on Mn-doped CdS quantum dots-sensitized two-dimensional(2D)layered g-CN-MoS heterojunction coupled with CuO labeled anti-Myo(anti-Myo-CuO)conjugates as signal amplification tags was ***,2D layered g-CN-MoS heterojunction was firstly prepared and then sensitized with CdS:Mn QDs as photoactive *** immobilized with the anti-Myo polyclonal antibody(anti-Myo),Myo,and anti-Myo-CuO conjugates,the sandwich type immunosensor was *** sensitivity of the immunosensor was resulted from the following *** 2D layered g-CN-MoS heterojunction could adequately harvest the exciting light,evidently promote the electron transfer,and effectively restrain the electron-hole pairs ***,the heterojunction could enrich plenty of CdS:Mn on its surface and thus could significantly enhanced photocurrent intensity of the *** target Myo antigen existed,the steric hindrance of anti-Myo-CuO conjugates impedes the diffusion of the ascorbic acid as electron donor to the ***,the CuO would competitively absorb the light and effectively consume the electron donor of the PEC platform,thus quenching the photocurrent of the *** fabricated photoelectrochemical immunosensor exhibited a wide linear range from 1.0 pg mL to 50 ng mL and a low limit of detection of 0.42 pg m ***,The PEC platform demonstrates high specificity,good stability and satisfied applicability in real biological *** strategy may furnish new insights for the construction of novel 2D/2D heterostructures with high PEC activity.

关键词： Photoelectrochemical immunosensor Two-dimensional layered heterojunction g-C3N4-MoS2/CdS:Mn compound Signal amplification

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Photogenerated hole-induced chemical redox cycling on Bi2S3/Bi2Sn2O7 heterojunction: Toward general amplified split-type photoelectrochemical immunoassay

Photogenerated hole-induced chemical redox cycling on Bi2S3/...

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河南省化学会2018年学术年会

作者： Bing Wang jun-tao cao Yan-Ming Liu College of Chemistry and Chemical Engineering Xinyang Normal University

This work reports the elegant bridging of enzymatic generation of electron donor with photogenerated hole-induced chemical redox cycling amplification(RCA)for innovative photoelectrochemical(PEC)immunoassay,by the aid of a heterojunction photoelectrode with split-type ***,the system was exemplified by the alkaline phosphatase(ALP)catalytic generation of ascorbic acid(AA),the redox cycling of AA by tris(2-carboxyethyl)phosphine(TCEP)as reductant,and the use of a novel BiS/BiSnO heterojunction and myoglobin(Myo)as the photoelectrode and the target,*** the immunoreaction and ALP-induced production of AA,the subsequent oxidation of AA by the photogenerated holes of the BiS/BiSnO heterojunction could be cycled via the regeneration of AA by TCEP from the oxidized product of dehydroascorbic acid,leading to easy signal amplification for the sensitive immunoassay of Myo in real *** is believed that this work provided a basis for further design and development of general RCA-based PEC immunoassays.

关键词： Photoelectrochemical immunoassay Chemical redox cycling Bi2S3/Bi2Sn2O7 heterojunction Split-type strategy Myoglobin

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Sensitive CE-ECL method for β-blockers detection with AuNPs-enhanced signal and the study of drug–protein interactions

Sensitive CE-ECL method for β-blockers detection with AuNPs...

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河南省化学会2016年学术年会

作者： Hong-Bing Duan jun-tao cao Yan-Ming Liu College of Chemistry and Chemical Engineering Xinyang Normal University

A sensitive capillary electrophoresis(CE) system coupled with electrochemiluminescence(ECL) of tris(2,2’-bipyridyl) ruthenium(II) is described for the detection of propranolol(Pro) and acebutolol(Ace). Au NPs were added to the end column luminescent reagents solution to enhance the sensitivity of the CE-ECL system. Experimental conditions of separation and detection as well as the amount of Au NPs were optimized. Under the optimum conditions, the linear range of Pro is 0.01 to 100 mmol Lwith the LOD of 3.6 × 10 mol L(S/N = 3) and with the LOQ of 1.1 × 10 mol L in human urine samples(S/N = 10). For Ace, the linear range is 0.02 to 100 mmol L with the LOD of 5.0 × 10 mol L(S/N = 3) and with the LOQ of 9.5 × 10 mol L in human urine samples(S/N = 10). RSDs(n = 3)of the migration time for Pro and Ace are from 1.9 to 2.4% intraday and from 2.9 to 3.8% *** of the peak area for Pro and Ace are from 3.2 to 3.7% intraday and from 4.3 to 4.6% interday,respectively. The developed method was successfully used to determine two analytes in human urine samples. In addition, the interaction between Pro as a model analyte and human serum albumin(HSA)was investigated;the number of binding site and the binding constant of Pro with HSA are 1.0 and 2.3 ×10 L mol, respectively.

关键词： Capillary electrophoresis Electrochemiluminescence AuNPs drug-protein interaction

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A label-free electrochemiluminescence aptasensor for protein detection based on electrodeposited ZnS–CdS on MoS2 decorated electrode

A label-free electrochemiluminescence aptasensor for protein...

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河南省化学会2016年学术年会

作者： Yu-Ling Wang jun-tao cao Yan-Ming Liu College of Chemistry and Chemical Engineering Xinyang Normal University

In this work, a novel, simple and label-free electrochemiluminescence(ECL) strategy was designed for sensitive carcinoembryonic antigen(CEA) assay on the basis of Zn S-Cd S nanoparticles(NPs)-decorated molybdenum disulfide(MoS) nanocomposites. Layered-MoS nanocomposites with large surface area were prepared with a facile hydrothermal method and used as electrode matrix for subsequent Zn S-Cd S NPs electrodeposition. The Zn S-Cd S NPs decorated MoS electrode shows higher ECL intensity than the electrode only with Zn S-Cd S electrodeposition. For the aptasensor fabrication,chitosan was coated on the Zn S-Cd S/MoS/glass carbon electrode for CEA aptamer immobilization through covalent coupling method. The ECL aptasensor for CEA detection exhibits a linear range from 0.05 to 20 ng m L(R = 0.9975) with a low detection limit of 0.031 ng m L, and presents a satisfactory specificity against some possible interfering proteins. Moreover, the method was successfully applied for the CEA determination in human serum with the recoveries of 80% – 111%, showing great promise for application in practice.

关键词： electrodeposited ZnS–CdS MoS2 decorated electrode Electrochemiluminescence aptasnesor CEA detection

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A spatial-resolved electrochemiluminescence aptasensor for protein detection in a double-check mode

A spatial-resolved electrochemiluminescence aptasensor for p...

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河南省化学会2018年学术年会

作者： Fu-Rao Liu jun-tao cao Yan-Ming Liu College of Chemistry and Chemical Engineering Xinyang Normal University

A spatial-resolved electrochemiluminescence(ECL)aptasensing platform for sensitive protein detection was constructed in a double-check ***-C composites as cathodic ECL emitters and luminol-gold nanoparticles(L-Au NPs)as anodic ECL emitters were immobilized on working electrode 1(WE1)and working electrode 2(WE2)of the dual-disk glassy carbon electrodes(DDCE),*** aptasensing platform was designed by integrating Ag-polyamidoamine NCs-labeled biotin-aptamer(Ag-PAMAM-bio-Apt)with the ECL emitters on the *** in-situ consumption of co-reactants,*** in the ECL system by Ag-PAMAM NCs resulted in the great ECL quenching on both WE1 and *** resonance energy transfer between L-Au NPs and Ag-PAMAM NCs made the ECL on WE2 further *** the presence of carcinoembryonic antigen(CEA),portions of Ag-PAMAM-bio-Apt detached from the DDCE because of the competitive reaction of CEA and cDNA toward to Ag-PAMAM-bio-Apt,generating an enhancement of ECL *** strategy achieves the detection of CEA in a double-check mode with detection limits of 0.39 pg m L for the cathodic assay(WE1)and 0.20 pg m L for the anodic assay(WE2),***,the proposed method had been successfully applied to determine CEA in human serum sample with recoveries of80.0?110.0%,showing great potential in cancer diagnosis.

关键词： Carcinoembryonic antigen Silver-polyamidoamine nanoparticles Resonance energy transfer CdS-C composites Luminol-gold nanoparticles

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Enhanced chemiluminescence by Au-Ag core-shell nanoparticles: A general and practical biosensing platform for tumor marker detection

Enhanced chemiluminescence by Au-Ag core-shell nanoparticles...

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河南省化学会2018年学术年会

作者： Wen-Sheng Zhang jun-tao cao Yan-Ming Liu College of Chemistry and Chemical Engineering Xinyang Normal University

A general and practical chemiluminescence(CL)biosensing platform for detection of tumor marker prostate-specific antigen(PSA)as a model analyte was developed for the first time based on the excellent catalytic performance of bimetallic Au-Ag core-shell nanoparticales(Au@Ag NPs)on luminol-KFe(CN) CL *** Au@Ag NPs were synthesized by a simple and green aqueous phase successive reduction *** prepared Au@Ag NPs with remarkable synergistic catalytic activity effect could significantly catalyze luminol-KFe(CN) CL reaction to produce a great CL *** on this synergistic catalytic activity,a luminol-KFe(CN)-Au@Ag NPs CL system combined with immunoassay was designed for the sensitive detection of *** this protocol,the Au@Ag NPs were modified with anti-PSA-antibody(Ab-Au@Ag NPs)to specifically capture target molecules *** the presence of PSA,a non-competitive immunoreaction occurred between Ab-Au@Ag NPs and PSA to form an immnunonanoshperes(PSA-Ab-Au@Ag NPs).The results show that the CL catalytic ability of the immnunonanospheres decreased with the PSA concentration *** the quenching degree of CL signals is proportional to the logarithm of PSA concentration in the range of 0.1 pg m L–100.0 ng m *** to the fine performance of the Au@Ag NPs,the detection limit of the method is down to 0.047 pg m L(S/N=3).Moreover,the applicability of the present method was successfully applied for PSA determination in human serum samples with recoveries of 86.1%–112.5%,demonstrating great promise for application in biochemical analysis.

关键词： Bimetallic Au-Ag core-shell nanoparticles Chemiluminescence biosensing platform Prostate-specific antigen

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