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A New Approach to Isothermal Precipitation Kinetics of Carbides

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Journal of Materials Science & Technology 1998年第5期14卷 478-480页

作者： Fu, WT Wang, Z Jing, TF Zheng, yz Ma, JG Yanshan Univ Dept Mat Engn Qinhuangdao 066004 Peoples R China Harbin Frame Factory Elect Cable Harbin Peoples R China

A new approach to isothermal precipitation kinetics of carbides in undercooled austenite has been proposed firstly, which is based on measuring the changes of M-s paint vs holding time at a certain temperature. The isothermal precipitation kinetics (PTT) curve of carbides was obtained by the use of the method for 13Cr-8Mn-0.07N stainless steel, and compared with the results of chemical phase analysis and TEM method. The results show that the new method is more sensitive and convenient than the other methods.

关键词： Stainless steel

Synthesis, characterization and electrical conductivity of poly [ethyl trifluorobuty-2-noate]

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Chinese Journal of Chemistry 1995年第6期13卷 545-551页

作者： Yang, SY Zhao, WY Huang, yz Zhang, XQ Zhang, JY CHINESE ACAD SCI SHANGHAI INST ORGAN CHEMSHANGHAI 200032PEOPLES R CHINA

Poly[ethyl trifluorobuty-2-noate] (PETFB) was prepared from ethyltrifluorobuty-2-noate by anionic polymerization. The polymer was examined by UV-Vis, IR and NMR spectrometries. It possessed pi-conjugated backbone in the main chain. No significant variation in the electrical conductivity of BF3-doped PETFB was observed after more than three months' storage, indicating improved conductive stability in air as compared with polyacetylene.

关键词： fluoro-polyacetylene doping synthesis characterization electrical conductivity

SARS-CoV-2-specific T cells in infection and vaccination

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Cellular & Molecular Immunology 2021年第10期18卷 2307-2312页

作者： Antonio Bertoletti Nina Le Bert Martin qui Anthony T.Tan Programme in Emerging Infectious Diseases Duke-NUS Medical SchoolSingaporeSingapore Singapore Immunology Network A*STARSingaporeSingapore

During viral infections,antibodies and T cells act together to prevent pathogen spread and remove virus-infected *** adaptive immunity can,however,also trigger pathological processes characterized by localized or systemic inflammatory *** protective and/or pathological role of virus-specific T cells in SARS-CoV-2 infection has been the focus of many studies in COVID-19 patients and in vaccinated ***,we review the works that have elucidated the function of SARS-CoV-2-specific T cells in patients and in vaccinated *** whether SARS-CoV-2-specific T cells are more linked to protection or pathogenesis is pivotal to define future therapeutic and prophylactic strategies to manage the current pandemic.

关键词： SARS-CoV-2 Vaccines T cells COVID-19

STUDIES　OF　THE　INTERACTION　BETWEEN　METALLOPORPHYRINS　OF　TMPYP－3　AND　SINGLE－STRANDED　DNA　ON　NC　MEMBRANE

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Chinese Chemical Letters 1995年第2期6卷 123-126页

作者： Chen, Y Li, yz Chang, WB Ci, YX Beijing Univ Dept Chem Beijing 100871 Peoples R China

We report here a fast staining method for single-stranded DNA fixed on nitrocellulose membrane using M-meso-letra(3-N-methylpyridyl)-porphrin (M-TMPyP, M: Mn3, Fe3, Pt3). The optimal staining solution consists of 54-108 μg/ml M-TMPyP in 25～200 mmol/l. phosphate buffer solution (pH 5.0～8.0).When DNA dot on NC membrane is treated with the staining solution at room temperature for 1～2 minutes with continuous stirring, it turns to brown-yellow.10pg per dot of single-stranded DNA is visible. It is a useful tool to sludy the DNA blotting, and for recognition of the special bands of DNA in a complete electrophoretogram of DNA blot. The staining mechanism is also *** staining techniques of DNA play a important role in DNA blotting,display of DNA elcctophoretogram and location of the special DNA band from *** R.J. Fiel and co-workers[1] reported that meso-tetra(4-N-methylpyridyl) porphyrin can intercalale in calf thymus DNA. the intercalation between TMPyP-4 and DNA in solution has been intensively investigated by several groups[2～8],but none of them concerned with the interaction of metalloporphyrin and filterbound DNA. In this report, the use of M-TMPyP as a fast and sensitive staining reagent for single-strand DNA on NC membrane is described.

关键词： NC MEMBRANE BETWEEN AND DNA

TWO NORDITERPENOID ALKALOIDS FROM ACONITUM LEUCOSTOMUM

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Chinese Chemical Letters 1996年第8期7卷 725-728页

作者： Yue, JM Xu, J Sun, HD Chen, SN Chen, yz ACAD SINICA KUNMING INST BOTLAB PHYTOCHEMKUNMING 650204PEOPLES R CHINA LANZHOU UNIV DEPT CHEMLANZHOU 730000PEOPLES R CHINA

Two new norditerpenoid alkaloids leucostines A (1) and B (2) have been isolated from the soot of Aconitum leucostomum. Their structures were elucidated on the basis of spectral data and chemical evidence.

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Rectangular tunnel heading stability in three dimensions and its predictive machine learning models

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第11期16卷 4683-4696页

作者： Jim Shiau Suraparb Keawsawasvong Van qui Lai Thanachon Promwichai Viroon Kamchoom Rungkhun Banyong School of Engineering University of Southern QueenslandQLDToowoomba4350Australia Department of Civil Engineering Thammasat School of EngineeringThammasat UniversityKlong LuangPathumthani12120Thailand Faculty of Civil Engineering Ho Chi Minh City University of Technology(HCMUT)Ho Chi Minh CityViet Nam Vietnam National University Ho Chi Minh City(VNU-HCM) Ho Chi Minh CityViet Nam Excellent Centre for Green and Sustainable Infrastructure Department of Civil EngineeringSchool of EngineeringKing Mongkut's Institute of Technology Ladkrabang(KMITL)BangkokThailand

Tunnel heading stability in two dimensions(2D)has been extensively investigated by numerous scholars in the past *** significant limitation of 2D analysis is the absence of actual tunnel geometry modeling with a considerable degree of ***,it is possible to study the stability of tunnels in three dimensions(3D)with a rectangular shape using finite element limit analysis(FELA)and a nonlinear programming *** paper employs 3D FELA to generate rigorous solutions for stability numbers,failure mechanisms,and safety factors for rectangular-shaped *** further explore the usefulness of the produced results,multivariate adaptive regression spline(MARS)is used for machine learning of big dataset and development of design equations for practical design *** study should be of great benefit to tunnel design practices using the developed equations provided in the paper.

关键词： Wide rectangular tunnel Finite element limit analysis(FELA) Multivariate adaptive regression spline(MARS) Three dimensions(3D) Stability analysis

A new strategy for the stereoselective synthesis of 2,3-dideoxy-3-fluoro-D-ribofuranose derivatives

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Chinese Journal of Chemistry 1995年第4期13卷 363-367页

作者： GUO, ZW HUANG, BG XIAO, WJ HUI, yz LANG, SA CHINESE ACAD SCI SHANGHAI INST ORGAN CHEMSHANGHAI 200032PEOPLES R CHINA AMER CYANAMID CO DIV MED RESPEARL RIVERNY 10965

The important intermediate for syntheses of various anti-HIV nucleoside analogues, methyl 2,3-dideoxy-3-fluoro-6-O-(p-methylbenzoyl)-alpha-D-ribofuranoside, was synthesized starting from 2-deoxy-D-ribose in 5 steps With an overall yield of 24%. This strategy can be also used for synthesizing other analogues with various substitutions at 3-C position.

关键词： NEW METHOD STEREOSELECTIVE SYNTHESIS 2,3-DIDEOXY-3-SUBSTITUTED-D-RIBOFURANOSIDE

Underground storage tank blowout analysis:Stability prediction using an artificial neural network

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Journal of Safety Science and Resilience 2023年第4期4卷 366-379页

作者： Nhat Tan Duong Van qui Lai Jim Shiau Rungkhun Banyong Suraparb Keawsawasvong Faculty of Civil Engineering Ho Chi Minh City University of Technology(HCMUT)VNU-HCMHo Chi Minh CityVietnam School of Engineering University of Southern QueenslandToowoomba 4350QLDAustralia Research Unit in Sciences and Innovative Technologies for Civil Engineering Infrastructures Department of Civil EngineeringThammasat School of EngineeringThammasat UniversityPathumthani 12120Thailand

Most geotechnical stability research is linked to“active”failures,in which soil instability occurs due to soil self-weight and external surcharge *** contrast,research on passive failure is not common,as it is predominately caused by external loads that act against the soil *** earlier active trapdoor stability investigation using the Terzaghi’s three stability factor approach was shown to be a feasible method for evaluating cohesive-frictional soil ***,this technical note aims to expand“active”trapdoor research to assess drained circular trapdoor passive stability(blowout condition)in cohesive-frictional soil under axisymmetric *** numerical finite element limit analysis(FELA)simulations,soil cohesion,surcharge,and soil unit weight effects are considered using three stability factors(Fc,Fs,and Fγ),which are all associated with the cover-depth ratio and soil internal friction *** upper-bound(UB)and lower-bound(LB)results are presented in design charts and tables,and the large dataset is further studied using an artificial neural network(ANN)as a predictive model to produce accurate design *** proposed passive trapdoor problem under axisymmetric conditions is significant when considering soil blowout stability owing to faulty underground storage tanks or pipelines with high internal pressures.

关键词： Blowout Passive stability Trapdoor Stability factors Limit analysis

Solid state diffusion welding by superplastic coordinate deformation between NiFeCrBSi(G112WC) and 3Cr2W8VA

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Chinese Science Bulletin 1997年第7期42卷 605-608页

作者： Zhang, yz Li, YX Chen, FX Huang, JL Superplastic Research Group of Luoyang Institute of Technology Luoyang China

As an effective and economical surface strengthening method, flame spray technology is now widely used in surface shielding of engineering materials and equipments or parts repairments. However, the porosities inside ... 详细信息

关键词： G112Wc alloy superplastic coordinate deformation 3Cr2W8VA steel solid state diffusion welding.