检索结果-南通市图书馆

Preparation of WO3/C Composite and Its Application in Oxidative Desulfurization of Fuel

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2017年第2期19卷 65-73页

作者： Zhao Rongxiang Li Xiuping su jianxun Shi Weiwei Gao Xiaohan College of Chemistry Chemical Engineering and Environmental EngineeringLiaoning Shihua University Fushun 113001

The WO_3/C composite was successfully prepared by calcination of a mixture of WO_3 and g-C_3N_4 at 520 ℃. The as-synthesized samples were analyzed by X-ray diffraction(XRD), electronic differential system(EDS), scanning electron microscopy(SEM), infrared spectrometry(IR) and the Brunner-Emmet-Teller(BET) techniques. The WO_3/C composite, in comparison with the WO_3 and C_3N_4, features smaller particle size, bigger surface area and higher desulphurization performance. The influence of the reaction temperature, the catalyst dosage, the reaction time, the oxidant dosage, the sulfide type and the extractant dose on desulfurization reaction was studied. The results showed that the WO_3/C composite revealed a higher desulfurization activity than the WO_3. The desulfurization rate could reach up to 95.8% under optimal conditions covering a catalyst dosage of 0.02 g, a H_2O_2 amount of 0.2 mL, a 1-ethyl-3-methylimidazolium ethyl sulfate(EMIES) amount of 1.0 mL, a reaction temperature of 70 ℃ and a reaction time of 180 min. After five recycles, the desulfurization activity of catalyst did not significantly decline.

关键词： WO3/C ionic liquid 1-ethyl-3-methylimidazolium ethyl sulfate oxidative desulfurization

Observation of deuterium molecule emission spectra under an active feedback control of H-mod plasma divertor detachment experiment on the EAST tokamak

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第12期28卷 231-236页

作者： Wei Gao Juan Huang Jichan Xu Liang Wang Jing Zhang jianxun su Yingjie Chen Wei Gao Zhenwei Wu Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

Based on neon gas puffing, an active feedback control of H-mod plasma divertor detachment experiment was successfully operated on the EAST tokamak. During the feedback control discharge, the plasma was detached by puffing neon gas and the strike point splitting phenomenon on divertor target was also clearly observed by divertor probes *** boundary region, many neutral particle processes(atom and molecule) were happened and accompanied by their emission spectra under the detachment discharge. By studying these emission spectra, it is helpful for us to understand the role of atoms and molecules in boundary recycling, which is important for studying the physical mechanism of divertor detachment. For the Fulcher-α system(d(3 p)3Πu±→ a(2 s)3Σg+), D2 emission spectra in the range from 601 nm to 606 nm were observed, identified and fitted in the detachment experiment for the first time on the EAST, and the spectra in the Q(0–0) band(d3Πu-→ a(2 s)3Σg+) in the Q branch of the Fulcher-α system were used for detailed analysis to acquire the boundary region temperature Te(below 5eV), which could not be provided very well by other diagnostics on the EAST. An electronic version deuterium molecular spectral line database was established to identify the spectral lines and a multi-peak fitting program was developed to fit and analyze the observed spectra.

关键词： plasma detachment molecular spectrum deuterium

Analysis of asymmetry of the D_(α)emission spectra under the Zeeman effect in boundary region for D-D experiment on EAST tokamak

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第2期30卷 377-384页

作者： Wei Gao Juan Huang jianxun su Jing Fu Yingjie Chen Wei Gao Zhenwei Wu EAST Team Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

In 2015 campaign,deuterium atomic emission spectra(D_(α))under the Zeeman effect in boundary region had been measured by a high resolution optical spectroscopic multichannel analysis(OSMA)system based on passive spectroscopy during the deuterium plasma discharge on EAST tokamak,and part of the works about the Zeeman effect on D_(α)spectra had already been ***,the asymmetric phenomena of D_(α)emission spectra under the Zeeman effect were observed in process of analyzing the spectral *** understand the asymmetric phenomena and acquire the useful local plasma information,an algorithm was proposed and used to analyze the asymmetry of the emission spectra under the Zeeman effect with all polarization components(πand±σ).In the algorithm,the neutral atoms were considered to follow the Maxwell distribution on EAST,and I+σ=I-σwas considered and *** of the line-averaged spectra along the viewing chord,the emission spectra were considered from two different regions:low-field side(LFS)and high-field side(HFS).Each spectral line was classified into three energy categories(the cold,warm,and hot)based on different atomic production processes in boundary *** viewing angleθ(between the magnetic field B and the viewing chord),magnetic field B at two spectral emission positions(HFS and LFS)and the Doppler shift of all three energy categories of each spectral line were all considered in the *** effect of instrument function was also included *** information of the boundary plasma were acquired,the reason for the asymmetric phenomena was discussed,and the boundary recycling during the discharge were studied in the *** on fitting a statistical data of acquired fitting results,an important conclusion was acquired that the ratio of the spectral line intensity in HFS and LFS was proportional to the square of that of the corresponding magnetic field.

关键词： Zeeman effect deuterium atom spectral lineshape plasma

Hybrid PMM-MoM Method for the Analysis of Finite Periodic Structures

在线全文

学校读者我要写书评

暂无评论

Open Journal of Applied Sciences 2012年第4期2卷 175-178页

作者： Shan Zhao Naiqian Zhang Dong Li jianxun su Department of Microwave Technology East China Research Institute of Electronic Engineering Hefei China Information Engineering College Communication University of China Beijing China

In this paper, a hybrid method (hybrid PMM-MoM method) is presented for the effective and accurate analysis of finite periodic structures. This method divides a finite periodic structure into two parts. The inner part of an approximate infinite periodic structure is analyzed by periodic method of moment (PMM);the outer part is then analyzed by method of moments (MoM). For the finite periodic structures, the accuracy of the new method is much better than that of the pure PMM, and is almost the same as that of pure MoM. Because pure PMM uses the periodic boundary conditions, it takes much less memory resources and computation time. For hybrid PMM-MoM method, because the inner part is calculated by PMM, the calculation work concentrates on the outer part. Consequently, compared with the exact MoM, the new method saves much more memory resources and computation time, which provides a drastic reduction of unknowns.

关键词： hybrid method PMM-MoM infinite Periodic Structures RCS

Reconstructions of velocity distributions from fast-ion D-alpha(FIDA)measurements on EAST

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2021年第9期23卷 24-33页

作者： jianxun su Baonian WAN Juan HUANG Birgitte MADSEN Mirko SALEWSKI Yanxu suN Jinfang WANG Jing FU Jiafeng CHANG Chengrui WU Lizhen LIANG Yingjie CHEN Guoqiang ZHONG Haiqing LIU Qing ZANG Yingying LI Bo LYU Jinping QIAN Xianzu GONG EAST Team Institute of Plasma Physics Chinese Academy of Sciences University of Science and Technology of China Department of Physics Technical University of Denmark School of Science Hubei University of Automotive Technology

2D fast-ion velocity-space distributions have been reconstructed from two-view fast-ion D-alpha(FIDA)measurements on experimental advanced superconducting tokamak(EAST).To make up for the sparse data and incomplete velocity-space coverage with the dual-view,we use nonnegativity and null-measurements as prior information to reconstruct the velocity distribution in experiments with co-and counter-current neutral beam *** improved reconstructed fast-ion distribution is achieved by combining the existing O-and B-port FIDA measurements with the proposed A-port FIDA *** further improve the reliability of FIDA-based reconstructions on EAST,based on real multi-view FIDA measurements on EAST in the near future,various bases will be studied further.

关键词： fast-ion D-alpha(FIDA) FIDASIM.velocity-space tomography fast ion EAST tokamak

PATH PROBLEM SIMPLIFICATION WITH DESIRED BOUNDED LENGTHS IN ACYCLIC NETWORKS

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2015年第4期24卷 500-519页

作者： Zhixiong su jianxun Qi Hanying Wei Business Administration College Nanchang Institute of Technology School of Economics and Management North China Electric Power University

Path determination is a fundamental problem of operations research. Current solutions mainly focus on the shortest and longest paths. We consider a more generalized problem; specifically, we consider the path problem with desired bounded lengths （DBL path problem）. This problem has extensive applications; however, this problem is much harder, especially for large-scale problems. An effective approach to this problem is equivalent simplification. We focus on simplifying the problem in acyclic networks and creating a path length model that simplifies relationships between various path lengths. Based on this model, we design polynomial algorithms to compute the shortest, longest, second shortest, and second longest paths that traverse any arc. Furthermore, we design a polynomial algorithm for the equivalent simplification of the is O（m）, where m is the number of arcs. DBL path problem. The complexity of the algorithm

关键词： Operations research path problem with desired bounded lengths equivalent simplification,path length model acyclic network

Simplifying the Nonlinear Continuous Time-Cost Tradeoff Problem

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2017年第4期30卷 901-920页

作者： su Zhixiong QI jianxun WEI Hanying Business Administration College Nanchang Institute of Technology School of Economics and Management North China Electric Power University

Equivalent simplification is an effective method for solving large-scale complex problems. In this paper, the authors simplify a classic project scheduling problem, which is the nonlinear continuous time-cost tradeoff problem(TCTP). Simplifying TCTP is a simple path problem in a critical path method(CPM) network. The authors transform TCTP into a simple activity float problem and design a complex polynomial algorithm for its solution. First, the authors discover relationships between activity floats and path lengths by studying activity floats from the perspective of path instead of ***, the authors perform simplification and improve the efficiency and accuracy of the solution by deleting redundant activities and narrowing the duration intervals of non-redundant activities. Finally,the authors compare our method with current methods. The relationships between activity floats and path lengths provide new approaches for other path and correlative project problems.

关键词： Activity floats CPM networks operational research simplification time-cost tradeoff.

Immunologically effective poly(D-lactic acid) nanoparticle enhances anticancer immune response

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第4期66卷 1150-1160页

作者： Weiguo Xu Yuanzhen su Yang Ma Qi Wei Jiazhen Yang Xiuli Zhuang jianxun Ding Xuesi Chen School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Department of Thoracic surgery China-Japan Union Hospital of Jilin UniversityChangchun 130033China

Chiral materials with the same atomic compositions exhibit different chemical,physical,and biological properties because of their distinct spatial ***,a chiral strategy was proposed to develop poly(lactic acid)(PLA)nanoparticle as an efficient nanoadjuvant to activate adaptive anticancer *** chiral nanovaccines were prepared by directly mixing amino-terminated PLA(PLLA-NH2 or PDLA-NH2)with the model protein antigen ovalbumin(OVA).After being injected into mice subcutaneously,both nanovaccines efficiently migrated to the lymph nodes to initiate the sequential anticancer immune *** with the PLLA nanovaccine(PLLA-OVA),the PDLA one(PDLA-OVA)contributed to more robust dendritic cell(DC)maturation,antigen presentation,and T lymphocyte *** addition to the activation of cellular immunity,PDLA-OVA also triggered a more vigorous activation of humoral immunity,which induced the production of more anti-OVA immunoglobulin G(IgG)than *** used as prophylactic or therapeutic nanovaccine toward murine melanoma models,PDLA-OVA triggered more potent adaptive anticancer immune responses that more effectively inhibited the cancer genesis and progression,indicating the significant potential of immunologically effective PDLA nanoadjuvant in cancer immunotherapy.

关键词： poly(D-lactic acid) chiral nanomaterial immune nanoadjuvant nanovaccine cancer immunotherapy

Computational simulations reveal the binding dynamics between human ACE2 and the receptor binding domain of SARS-CoV-2 spike protein

在线全文

学校读者我要写书评

暂无评论

Quantitative Biology 2021年第1期9卷 61-72页

作者： Cecylia SLupala Xuanxuan Li Jian Lei Hong Chen jianxun Qi Haiguang Liu Xiao-Dong su Complex Systems Division Beijing Computational Science Research CenterBeijing 100193China Engingeering Physics Department Tsinghua UniversityBeijing 100084China State Key Laboratory of Biotherapy and Cancer Center National Clinical Research Center for GeriatricsWest China HospitalSichuan UniversityChengdu 610041China School of Life Sciences State Key Laboratory of Protein and Plant Gene Research and Biomedical Pioneering Innovation Center(BIOPIC)Peking UniversityBeijing 100871China CAS Key Laboratory of Pathogenic Microbiology and Immunology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China Physics Department Beijing Normal UniversityBeijing 100875China

Background:A novel coronavirus(the SARS-CoV-2)has been identified in January 2020 as the causal pathogen for COVID-19,a pandemic started near the end of *** Angiotensin converting enzyme 2 protein(ACE2)utilized by the SARS-CoV as a receptor was found to facilitate the infection of SARS-CoV-2,initiated by the binding of the spike protein to human ***:Using homology modeling and molecular dynamics(MD)simulation methods,we report here the detailed structure and dynamics of the ACE2 in complex with the receptor binding domain(RBD)of the SARS-CoV-2 spike ***:The predicted model is highly consistent with the experimentally determined structures,validating the homology modeling *** the binding interface reported in the crystal structures,novel binding poses are revealed from all-atom MD *** simulation data are used to identify critical residues at the complex interface and provide more details about the interactions between the SARS-CoV-2 RBD and human ***:Simulations reveal that RBD binds to both open and closed state of *** human ACE2 mutants and rat ACE2 are modeled to study the mutation effects on RBD binding to *** simulations show that the N-terminal helix and the K353 are very important for the tight binding of the complex,the mutants are found to alter the binding modes of the CoV2-RBD to ACE2.

关键词： SARS-CoV-2 COVID-19 ACE2 mutation molecular dynamics simulations