检索结果-南通市图书馆

高效锻轧工艺对C192异型铜带组织及性能的影响

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

锻压技术 2024年第9期49卷 43-49页

作者：韩振斌赵昭于国军刘冬刘建斌齐啸天杨述天金昌镍都矿山实业有限公司甘肃金昌737100 金川集团铜业有限公司甘肃金昌737100

为探究异型铜带材料的组织演变规律及性能,采用自主研制的高频锻轧自动化生产线对C192异型铜带进行制备,并通过光学显微镜(OM)、电子背散射衍射(EBSD)和万能拉力试验等方法对锻轧模锻过程中的组织演变进行了分析。试验结果表明:模锻过... 详细信息

为探究异型铜带材料的组织演变规律及性能,采用自主研制的高频锻轧自动化生产线对C192异型铜带进行制备,并通过光学显微镜(OM)、电子背散射衍射(EBSD)和万能拉力试验等方法对锻轧模锻过程中的组织演变进行了分析。试验结果表明:模锻过程中晶粒细化,晶粒取向以择优为主,且薄料部位晶粒表现出明显的形变方向。通过力学性能测试,发现薄料的抗拉强度、屈服强度和维氏硬度均优于厚料,而塑性方面厚料略优于薄料。对导电性能进行了测试,发现薄料在模锻后实施固溶退火处理,其晶粒尺寸逐步恢复至模锻初始状态,缩小了厚、薄料导电性能方面的差异。模锻工艺对异型铜带的组织结构和性能有显著影响,优化工艺参数可提高异型铜带的综合性能。

关键词：锻轧 C192异型铜带微观组织力学性能晶粒取向

Precise electro-reduction of alkyl halides for radical defluorinative alkylation

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2022年第4期65卷 762-770页

作者： Xingxiu Yan Shengchun Wang Zhao Liu Yujie Luo Pengjie Wang Wenyan Shi xiaotian qi Zhiliang Huang Aiwen Lei Institute for Advanced Studies(IAS)and College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China

Reported here is a precise electro-reduction strategy for radical defluorinative alkylation towards the synthesis of gem-difluoroalkenes from α-trifluoromethylstyrenes. According to the redox-potential difference of the radical precursors, direct or indirect electrolysis is respectively adopted to realize the precise reduction. An easy-to-handle, catalyst-and metal-free condition is developed for the reduction of alkyl radical precursors that are generally easier to be reduced than α-trifluoromethylstyrenes,while a novel electro-Ni-catalytic system is established for the electro-reduction of alkyl bromides or chlorides towards the electrochemical synthesis of gem-difluoroalkenes. The merit of this protocol is exhibited by its mild conditions, wide substrate scope, and scalable preparation. Mechanistic studies and DFT calculations proved that the coordination of α-trifluoromethylstyrenes to Ni-catalyst prevents the direct reduction of the alkene and, in turn, promotes the activation of alkyl bromide through halogen atom transfer mechanism.

关键词： electro-reductive cross-coupling gem-difluoroalkenes radical defluorinative alkylation electro/nickel catalysis C-C bonds formation

Switching Frequency Improvement of a High Speed on/off Valve Based on Pre-excitation Control Algorithm

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2024年第4期37卷 94-106页

作者： qi Zhong xiaotian Li Yongxin Mao Enguang Xu Tiwei Jia Yanbiao Li Huayong Yang College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310023China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China Key Laboratory of Special Purpose Equipment and Advanced Processing Technology Ministry of Education and Zhejiang ProvinceZhejiang University of TechnologyHangzhou 310023China

The high-speed on/off valve(HSV)serves as the fundamental component responsible for generating discrete fluids within digital hydraulic *** the switching frequency of the HSV increases,the properties of the generated discrete fluid approach those of continuous ***,a higher frequency response characteristic of HSV is the key to ensure the control accuracy of digital hydraulic ***,the current research mainly focuses on its dynamic performance,but neglect its *** paper presents a theoretical analysis demonstrating that the FRC of the HSV can be enhanced by minimizing its switching *** maximum switching frequency(MSF)is mainly determined by opening dynamic performance when HSV operates with low switching duty ratio(SDR),whereas the closing dynamic performance limits the MSF when HSV operates with high *** upon these findings,the pre-excitation control algorithm(PECA)is proposed to reduce the switching time of the HSV,and consequently enhance its *** results demonstrate that PECA shortens the opening delay time of HSV by 1.12 ms,the closing delay time by 2.54 ms,and the closing moving time by 0.47 ms in comparison to the existing advanced control *** a result,a larger MSF of 417 Hz and a wider controllable SDR range from 20%to 70%were achieved at a switching frequency of 250 ***,the proposed PFCA in this paper has been verified as an effective and promising approach for enhancing the control performance of digital hydraulic systems.

关键词： High speed on/off valve Switching frequency Pre-excitation Dynamic performance Switching duty ratio

视觉动力学分析和量子化学计算揭示铑催化[5+2+1]环加成反应机制

在线全文

学校读者我要写书评

暂无评论

有机化学 2022年第4期42卷 1258-1259页

作者：蓝宇戚孝天郑州大学化学学院郑州450001 武汉大学化学与分子科学学院武汉430072

八元碳环是一类重要的结构骨架,广泛存在于天然产物、药物分子及其它功能分子中^([1]).然而受限于成环过程中的熵损和焓变等不利因素,八元碳环的构建极具挑战性^([2]),相关合成策略报道较少.过渡金属催化的环加成反应被认为是合成环状... 详细信息

八元碳环是一类重要的结构骨架,广泛存在于天然产物、药物分子及其它功能分子中^([1]).然而受限于成环过程中的熵损和焓变等不利因素,八元碳环的构建极具挑战性^([2]),相关合成策略报道较少.过渡金属催化的环加成反应被认为是合成环状化合物的有效方法^([3-4]),具有原子经济性高等优点.Wender课题组^([5])曾报道了铑催化炔-乙烯基环丙烷(yne-vinylcyclopropanes)的分子内炔烃(2C合成子)与乙烯基环丙烷(5C合成子)的[5+2]环加成反应.

关键词：环加成反应量子化学计算环状化合物合成子环丙烷合成策略铑催化碳环

基于锻轧成形工艺的KFC异型铜带组织性能研究

在线全文

学校读者我要写书评

暂无评论

有色冶金设计与研究 2024年第2期45卷 20-24页

作者：韩振斌赵昭于国军刘冬蔺永花齐萧天杨述天刘建斌金昌镍都矿山实业有限公司甘肃金昌737100 金川集团铜业有限公司甘肃金昌737100

研究了KFC热轧合金带坯在锻轧工艺制备异型铜带过程中,通过冷锻、在线退火和轧制等工艺处理后内部组织的演变规律,并采用金相显微镜、电导率测试仪、维氏硬度仪及拉伸试验等检测了产品的综合性能指标。结果表明,带坯在冷锻加工率为69.45... 详细信息

研究了KFC热轧合金带坯在锻轧工艺制备异型铜带过程中,通过冷锻、在线退火和轧制等工艺处理后内部组织的演变规律,并采用金相显微镜、电导率测试仪、维氏硬度仪及拉伸试验等检测了产品的综合性能指标。结果表明,带坯在冷锻加工率为69.45%时,带材薄料区域处晶粒不断细化,内部产生大量位错带,加工硬化作用显著,带材的强度、硬度增大。对锻轧材料进行固溶退火处理后,晶粒不断加粗,且部分FeCu_(4)固溶物质转变为Fe相的Cu相。经过锻轧复合加工,材料的总形变量为74.79%,其抗拉强度和硬度由热轧态的289 MPa和65.3HV提升至336 MPa和112HV,电导率由85.12%IACS提升至89.23%,折弯次数在5次以上,展现出优异的综合性能。

关键词：锻轧异型铜带晶粒综合性能

The Mechanism of N-O Bond Cleavage in Rhodium-Catalyzed C-H Bond Functionalization of Quinoline N-oxides with Alkynes:A Computational Study

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

The Mechanism of N-O Bond Cleavage in Rhodium-Catalyzed C-H ...

Effects of Heterologously Overexpressing PIP5K-Family Genes in Arabidopsis on Inflorescence Development

中国化学会第九届全国有机化学学术会议

作者： Yingzi Li Song Liu Zisong qi xiaotian qi Xingwei Li Yu Lan School of Chemistry and Chemical Engineering Chongqing University Dalian Institute of Chemical Physics Chinese Academy of Sciences

＜正＞The mechanism and regioselectivity of the[RhⅢCl2Cp*]2-catalyzed C-H bond functionalization and N-O bond cleavage of quinoline N-oxide with alkynes were studied by using

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2024年第1期93卷 97-117页

作者： Mingda Yin Rui Luo Tana Liang qi Wen xiaotian Liang Yanpeng Wen Xuemei Hu Zhiyan Wang Chang Gao Wenjing Ren Fenglan Huang College of Life Science and Food Engineering Inner Mongolia Minzu UniversityTongliao028000China Key Laboratory of Castor Breeding of the State Ethnic Affairs Commission Inner Mongolia Minzu UniversityTongliao028000China Inner Mongolia Industrial Engineering Research Center of Universities for Castor Inner Mongolia Minzu UniversityTongliao028043China Inner Mongolia Key Laboratory of Castor Breeding and Comprehensive Utilization Inner Mongolia Minzu UniversityTongliao028000China Inner Mongolia Engineering Research Center of Industrial Technology Innovation of Castor Inner Mongolia Minzu UniversityTongliao028000China

Castor is one of the top 10 oil crops in the world and has extremely valuable *** inflorescences directly affect yield,so the study of inflorescence development is very important in increasing castor *** previous studies have shown that the PIP5K gene family(PIP5Ks)is associated with inflorescence *** this study,to determine the function of each PIP5K gene in castor,a female Lm-type castor line,aLmAB2,was used to determine the relative expression levels of the PIP5Ks in castor *** PIP5K genes were heterologously overexpressed in Arabidopsis thaliana,the relative expression of each gene and the effect on plants was determined in ***,and the relationships among the PIP5Ks in castor were *** expression levels of the PIP5Ks in the female Lm-type castor line aLmAB2 were *** relative expression levels of the PIP5K9 and PIP5K11 genes were high(p<0.05)in isofemale inflorescences,and those of PIP5K1,PIP5K2,PIP5K6,and PIP5K8 were high(p<0.05)in female inflorescences but low(p<0.05)in bisexual *** PIP5Ks were heterologously overexpressed in ***,and T3-generation plants with stable genetic resistance,i.e.,AT-PIP5K^(+)plants(AT-PIP5K1^(+),AT-PIP5K2^(+),AT-PIP5K6^(+),AT-PIP5K8^(+),AT-PIP5K9^(+),and ATPIP5K11^(+) plants),were *** tests of the AT-PIP5K+plants showed that the growth of the main stem was significantly delayed in AT-PIP5K+plants compared with Columbia wild-type(WT)*** plants;the PIP5K1 and PIP5K2 genes promoted lateral stem growth and flower and silique development;and the PIP5K6,PIP5K8,PIP5K9 and PIP5K11 genes inhibited lateral stem growth and flower and silique *** correlations among PIP5Ks in castor suggest that there may be a synergistic relationship among PIP5K1,PIP5K2,and PIP5K6 in castor inflorescences,and PIP5K8,PIP5K9,and PIP5K11 are complementary to the other three genes.

关键词： Castor inflorescence development PIP5K gene family gene overexpression

Mechanism,Chemoselectivity and Enantioselectivity for Rhodium-Catalyzed Desymmetric Synthesis of Hydrobenzofurans:A Theoretical Study

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

Mechanism,Chemoselectivity and Enantioselectivity for Rhodiu...

Clinicopathological significance and immunotherapeutic outcome of claudin 18.2 expression in advanced gastric cancer:A retrospective study

中国化学会第九届全国有机化学学术会议

作者： Zhaoyuan Yu xiaotian qi Yingzi Li Song Liu Yu Lan College of Chemistry and Chemical Engineering Chongqing University

Rhodium-catalyzed desymmetrlzation of cyclohexadienones is an efficient method for the asymmetric synthesis of *** newly reported density functional theory（DFT） method MN12-L is used to investigate the mechanism,chemoselectivity and enantiosclectiviry for this type reactions,Computational results indicate that the preferred pathway involves transmetallation to form an aryl-rhodium compound,alkyne insertion,intramolecular olefin *** protonation to generate the hydrobenzofurans *** enantioselectivity is controlled by the intramolecular olefin insertion step,which is ascribed to the steric repulsions between ligand and *** addition,the generation of side product via a second intermolecular alkyne insertion has also been considered in calculation.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Journal of Cancer Research 2024年第1期36卷 78-89页

作者： Changsong qi Xiaoyi Chong Ting Zhou Mingyang Ma Jifang Gong Miao Zhang Jian Li Jun Xiao Xiaohui Peng Zhen Liu Zonghai Li Lin Shen xiaotian Zhang State Key Laboratory of Holistic Integrative Management of Gastrointestinal Cancers Beijing Key Laboratory of Carcinogenesis and Translational ResearchDepartment of Gastrointestinal OncologyPeking University Cancer Hospital&InstituteBeijing 100142China Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing) Department of Gastrointestinal OncologyPeking University Cancer Hospital&InstituteBeijing 100142China CARsgen Therapeutics Co. LtdShanghai 200231China CARsgen Life Sciences Co. LtdShanghai 200131China

Objective: Immunotherapeutic outcomes and clinical characteristics of claudin 18 isoform 2 positive(CLDN18.2-positive) gastric cancer(GC) vary in different clinical studies, making it difficult to optimize antiCLDN18.2 therapy. We conducted a retrospective analysis to explore the association of CLDN18.2 expression with clinicopathological characteristics and immunotherapeutic outcomes in ***: A total of 536 advanced GC patients from 2019 to 2021 in the CT041-CG4006 and CT041-ST-01clinical trials were included in the analysis. CLDN18.2 expression on ≥40% of tumor cells(2+, 40%) and CLDN18.2 expression on ≥70% of tumor cells(2+, 70%) were considered the two levels of positively expressed GC. The clinicopathological characteristics and immunotherapy outcomes of GC patients were analyzed according to CLDN18.2 expression ***: CLDN18.2 was expressed in 57.6%(cut-off: 2+, 40%) and 48.9%(cut-off: 2+, 70%) of *** death-ligand 1(PD-L1) and CLDN18.2 were co-expressed in 19.8% [combined positive score(CPS)≥1, CLDN18.2(cut-off: 2+, 40%)] and 17.2% [CPS≥5, CLDN18.2(cut-off: 2+, 70%)] of ***18.2 expression positively correlated with younger age, female sex, non-gastroesophageal junction(nonGEJ), and diffuse phenotype(P<0.001). HER2 and PD-L1 expression were significantly lower in CLDN18.2-positive GC(both P<0.05). Uterine adnexa metastasis(P<0.001) was more frequent and liver metastasis(P<0.001)was less common in CLDN18.2-positive GC. Overall survival and immunotherapy-related progression-free survival(ir PFS) were inferior in the CLDN18.2-positive ***: CLDN18.2-positive GC is associated with poor prognosis and worse immunotherapeutic outcomes. The combination of anti-CLDN18.2 therapy, anti-PD-L1/PD-1 therapy, and chemotherapy for GC requires further investigation.

关键词： Gastric cancer claudin18.2 CT041 PD-L1 immunotherapy