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Microstructure and impact toughness of 16MND5 reactor pressure vessel steel manufactured by electrical additive manufacturing

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Journal of Iron and Steel Research International 2020年第8期27卷 992-1004页

作者： xi-kou He Chang-sheng xie Li-jun xiao Ying Luo Di Lu Zheng-dong Liu xi-tao Wang Institute for Special Steels China Iron and Steel Research InstituteBeijing 100081China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610041SichuanChina Southern Additive Science and Technology Co. Ltd.Foshan 528225GuangdongChina

Electrical additive manufacturing can improve manufacturing efficiency and reduce the cost of 16MND5 reactor pres-sure vessel steel. Impact tests were conducted to compare the impact toughness of 16MND5 steels manufactured by the electrical additive manufacturing and conventional forging, respectively. It is found that the impact toughness of electrical additive manufacturing specimen was slightly higher than that of conventional forging specimen. The characterizations of microstructure show that there were large ferrites and carbides in electrical additive manufacturing specimen. The fracture mechanisms of electrical additive manufacturing specimen were that microvoids or microcracks were prone to nucleate at the large ferrite/bainite interface and large carbide/bainitic ferrite interface, where the stress concentration was high. In addi-tion, the block size and high-angle grain boundaries played a vital role in hindering crack propagation of electrical additive manufacturing specimen, helping to improve the impact energy and leading to a low ductile–brittle transition temperature. The results suggest that the electrical additive manufacturing technology was an effective method to enhance the impact toughness of 16MND5 steel.

关键词： Electrical additive manufacturing 16MND5 steel Impact toughness Fracture High-angle grain boundary

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Molecular mechanism for the unusual enhancement of the second-step chemiluminescence production from the carcinogenic tetrabromohydroquinone and H2O_(2)

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Journal of Environmental Sciences 2024年第7期141卷 330-342页

作者： Zi-Han Wang Chun-Hua Huang Zhi-sheng Liu Li Mao Ben-zhan Zhu State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China College of Environment and Resources University of Chinese Academy of SciencesBeijing 100049China

We have found recently that two-step intrinsic hydroxyl radical(·OH)-dependent chemiluminescence(CL)could be produced by carcinogenic tetrahaloquinone and H_(2)O_(2).However,the first-step CL was too fast to clearly detect the stepwise generation of·OH and CL,and to distinguish the exact dividing point between the first-step and second-step *** we found that,extremely clear two-step intrinsic CL could be produced by the relative slow reaction of tetrabromohydroquinone(TBHQ)with H_(2)O_(2),which was directly dependent on the two-step·OH ***,the second-step,but not the first-step CL production of TBHQ/H_(2)O_(2)(CRET donor)was markedly enhanced by fluorescein(a typical xanthene dye,CRET acceptor)through a unique chemiluminescence resonance energy transfer(CRET)*** novel CRET system of TBHQ/H_(2)O_(2)/fluorescein was successfully applied for the sensitive detection of TBHQ with the detection limit as low as 2.5μmol/*** findings will help to develop more sensitive and highly efficient CL or CRET systems and specific CL sensor to detect the carcinogenic haloquinones,which may have broad environmental applications.

关键词： Two-step chemiluminescence Bromohydroquinone Hydrogen peroxide Hydroxyl radical CRET

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Insulation structure design and electric field simulation of 500 kV isolation energy supply transformer for HVDC breaker

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High Voltage 2022年第1期7卷 185-196页

作者： sheng zhang Yadong Fan Qingquan Lei Jianguo Wang Yuan Liu Ting zhan School of Electrical Engineering and Automation Wuhan UniversityWuhanChina Global Energy Interconnection Research Institute Co. LtdBeijingChina Institute of Advanced Electrical Materials Qingdao University of Science and TechnologyQingdaoChina China EPRI Electric Power Engineering Co.Ltd. BeijingChina

The high‐voltage isolated energy supply transformer(HIET)is the key component of the HVDC breaker,which is used for energy transmission and the potential *** is a lack of research results that can meet engineering applications at home and *** design of a 500 kV HIET with dry‐type insulation is proposed,using 10 cascade connected 50 kV sub‐transformers(STs),which uses silicon rubber suitable for DC voltage as the main insulation ***‐voltage(HV)winding of ST adopts double‐shielding structure of coil semi‐conductive shielding and inner semi‐conductive shielding to improve electric field *** simulation analysis of an electric field at different insulation thicknesses and temperatures shows that the electric field decreases with an increase in thickness of *** the thickness is greater than 25 mm,the electric field reduction effect is significantly *** electric field is closely related to temperature,when at 20℃,the electric field between double‐shielding is relatively *** at 70℃,the inner shielding electric field is much higher than coil shielding,and undergoes obvious *** addition,the 500 kV HIET's electric field has been *** 500kV HIET prototype has been manufactured and passed the type test,and successfully applied to the 500 kV zhangbei DC grid project.

关键词： winding insulation field

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Phosphoryl choline-grafted water-soluble carbon nanotube

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Chinese Chemical Letters 2008年第1期19卷 105-109页

作者： Tao zhang Kai xi Min Gu Zheng sheng Jiang Department of Material Science and Engineering Nanjing University Nanjing 210093 China College of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China Physics Department Nanjing University Nanjing 210093 China

Water-soluble property is the precondition of biomedical evaluation and application of carbon nanotube （CNT）. Novel water- soluble CNT was synthesized in this letter by grafting phosphoryl choline （PC） onto multi-wall CNTs. Utilizing FTIR, XPS, TGA and TEM, the title CNTs were characterized and it was found that the target products could facilely dissolve in water. 2007 Tao zhang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Carbon nanotube Water-soluble Phosphoryl choline

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Two new cytotoxic sesquiterpenoids from Solanum lyratum

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Chinese Chemical Letters 2013年第11期24卷 1030-1032页

作者： Gui-sheng Li Fang Yao Lei zhang xi-Dian Yue sheng-Jun Dai School of Pharmaceutical Science Yantai University

Two new sesquiterpenoids,attributable to eudesmane-type（1 and 2,named solajiangxins F and G）,were isolated from the whole plant of Solanum *** structures were elucidated on the basis of integrated spectroscopic *** vitro,compounds 1 and 2 were found to show signifcant cytotoxic activity against selected cancer cells,including P-388,HONE-1 and HT-29.

关键词： Solanum lyratum Solanaceae Sesquiterpenoid Solajiangxins F–G Cytotoxic activity

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Two bicistronic DNA vaccines against Vibrio anguillarum and the immune eff ects on flounder Paralichthys olivaceus

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Journal of Oceanology and Limnology 2022年第2期40卷 786-804页

作者： Hanlin LI Jing xiNG xiaoqian TANG xiuzhen sheng Heng CHI Wenbin zhan Laboratory of Pathology and Immunology of Aquatic Animals KLMMEOcean University of ChinaQingdao 266003China Laboratory for Marine Fisheries Science and Food Production Processes Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266071China

Chemokines are cytokines that can promote the activation and migration of immune cells,and increase the recognition of antigen by antigen-presenting cells(APC).Previous studies showed that a DNA vaccine can induce humoral and cellular immune responses of flounder after *** explore the improvement of chemokines on the efficiency of OmpK vaccine,two bicistronic DNA candidate vaccines were constructed and the immune responses they induced in the flounder were investigated by reverse transcription polymerase chain reaction(RT-PCR),indirect immunofl uorescent assay(IFA),H&E staining,fl ow cytometry(FCM),and quantifi cational real-time polymerase chain reaction(qRT-PCR).pBudCE4.1 plasmid as an expression vector,bicistronic DNA vaccines encoding OmpK gene and CC-motif ligand 4 gene(p-OmpK-CCL4),or Ompk gene and CC-motif ligand 19 gene(p-OmpK-CCL19)were successfully *** results showed that two bicistronic DNA vaccines expressed Ompk protein of Vibrio anguillarum and CCL4/CCL19 proteins of fl ounder both in vitro and in *** immunization,a large number of leucocytes in muscle were recruited at the injection site in treatment *** constructed vaccines induced signifi cant increases in CD4-1^(+) and CD4-2^(+) T lymphocytes,and sIgM^(+) B lymphocytes in peripheral blood,spleen,and head *** percentage of T lymphocytes peaked on the 14^(th) post-vaccination day whereas that of B lymphocytes peaked in the 6^(th) post-vaccination ***,the expression profi les of 10 immune-related genes increased in muscles around the injection site,spleen,and head *** the challenge,p-OmpK-CCL4 and p-OmpK-CCL19 conferred a relative percentage survival(RPS)of 74.1%and 63.3%,respectively,higher than p-OmpK alone(40.8%).In conclusion,both CCL4 and CCL19 can improve the protection of p-OmpK via evoking local immune response and then humoral and cellular ***4 and CCL19 will be potential molecular adjuvants for use in DNA vaccines.

关键词： Vibrio anguillarum outer membrane protein K bicistronic DNA vaccines CC-motif ligand 4 CC-motif ligand 19 immune response

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Quantum Wavefunctions and Fluctuations of Mesoscopic RLC Circuit

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Chinese Physics Letters 2000年第7期17卷 528-529页

作者： WANG Ji-Suo LIU Tang-Kun zhan Ming-sheng State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071 Laser Spectroscopy Laboratory Anhui Institute of Optics and Fine MechanicsChinese Academy of SciencesHefei 230031 Department of Physics Liaocheng Teachers UniversityLiaocheng 252059 Department of Physics Hubei Normal UniversityHuangshi 435002

The quantum wavefunctions and the corresponding energy levels of a RLC (Resistance-Inductance-Capacity) electric circuit are obtained by using canonical quantization method and unitary transformation from the classical equation of motion. The quantum fluctuations of charge and current in an arbitrary eigenstate of the system have also been given as wellas the uncertainty relation. It is showed that even if at 0 K charge and current in the circuit exhibit quantum fluctuations, which originates from fluctuations of zero point vibrations of the system.

关键词： motion quantum charge

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Public Emotional Diffusion over COVID-19 Related Tweets Posted by Major Public Health Agencies in the United States

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Data Intelligence 2022年第1期4卷 66-87页

作者： Haixu xi Chengzhi zhang Yi Zhao sheng He School of Economics and Management Nanjing University of Science and TechnologyNanjing 210094China School of Computer Engineering Jiangsu University of TechnologyChangzhou 213001China

Since the end of 2019,the COVID-19 outbreak worldwide has not only presented challenges for government agencies in addressing public health emergency,but also tested their capacity in dealing with public opinion on social media and responding to social *** understand the impact of COVID-19 related tweets posted by the major public health agencies in the United States on public emotion,this paper studied public emotional diffusion in the tweets network,including its process and characteristics,by taking Twitter users of four official public health systems in the United States as an *** extracted the interactions between tweets in the COVID-19-Tweet Ids data set and drew the tweets diffusion *** proposed a method to measure the characteristics of the emotional diffusion network,with which we analyzed the changes of the public emotional intensity and the proportion of emotional polarity,investigated the emotional influence of key nodes and users,and the emotional diffusion of tweets at different tweeting time,tweet topics and the tweet posting *** results show that the emotional polarity of tweets has changed from negative to positive with the improvement of pandemic management *** public’s emotional polarity on pandemic related topics tends to be negative,and the emotional intensity of management measures such as pandemic medical services turn from positive to negative to the greatest extent,while the emotional intensity of pandemic related knowledge changes the *** tweets posted by the Centers for Disease Control and Prevention and the Food and Drug Administration of the United States have a broad impact on public emotions,and the emotional spread of tweets’polarity eventually forms a very close proportion of opposite emotions.

关键词： Emotional diffusion Tweets COVID-19 Pandemic management US Public Health Agency

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Structural Characterization of Chloroplast Genome in Alpinia japonica(Thunb.)Miq.,a Medicinal Plant of the Genus Alpinia

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Phyton-International Journal of Experimental Botany 2024年第8期93卷 1897-1911页

作者： Wentao sheng xi Lei xinjie Chen Quan Kuang Department of Biological Technology Nanchang Normal UniversityNanchang330032China

The analysis of chloroplast gene characteristics in Alpinia japonica(Thunb.)*** of great significance for developing relevant genetic *** high-throughput sequencing and bioinformatic research were performed to analyze the chloroplast genome characteristics of *** total chloroplast genome length of *** was 161,906 bp,with a typical circular tetrameric *** 133 genes were annotated,comprising 87 protein-coding,38 tRNA,and 8 rRNA ***,22 genes contained two copies,and 18 genes owned *** sequence analysis showed that it contains 321 simple sequence repeats(SSRs)and 37 long segment *** with the chloroplast genomes of eight representative plants in the genus Alpinia,the gene structure,type,and quantity were relatively ***12 was the highest variation site in the entire chloroplast gene.A phylogenetic tree showed that the genus Alpinia was the most closely related to the genus ***,*** is the most closely related to Alpinia chinensis belonging to the genus ***,the chloroplast genome of a new species was reported in the genus Alpinia,and a basis was provided for the utilization of Alpinia plants as a medical resource.

关键词： The genus Alpinia Alpinia japonica(Thunb.)Miq chloroplast genome phylogenetic tree

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Fine Structure in the Electron Emission Process for Two DX-Like Centers in Sn-Doped AlGaAs

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Chinese Physics Letters 1998年第1期15卷 60-61页

作者： zhan Hua-han KANG Jun-yong HUANG Qi-sheng Department of Physics Xiamen UniversityXiamen 361005

Fine structure in the electron emission process for DX(Sn)centers in AlGaAs has been studied with high resolution Laplace defect *** influence of the different local configuration of Al and Ga atoms around the centers on the electron thermal emissions was *** experimental evidence for the microscopic structure of two DX-like centers in Sn-doped AlGaAs is provided.

关键词： AlGaAs centers DX

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