检索结果-南通市图书馆

Natural products inspired[3+2]cycloaddition enables efficient construction of hydroxylated tetrahydrofuran acetals and concise syntheses of lignans

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第7期67卷 2306-2313页

作者： Dong-yue Cai weiming Shi Zhao-Hui Jin Zhi-Xiang Yu Jin-Xin Zhao Jian-Min yue State Key Laboratory of Drug Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China University of Chinese Academy of Sciences Beijing 100049China Beijing National Laboratory for Molecular Sciences(BNLMS) Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of EducationCollege of ChemistryPeking UniversityBeijing 100871China

Mimicking biosynthetic pathways of hongkonoids led to the development of a new Cu(Ⅰ)-catalyzed[3+2]cycloaddition ofα-hydroxyketone andβ-keto enol ethers,affording tetrahydrofuran acetals in a highly diastereoselective manner and 100%atom *** studies on the mechanism disclosed a concerted but asynchronous Michael addition/aldol *** the same importance,this methodology provides a practical biomimetic approach for one-step construction of the dibenzylbutyrolactol lignan backbone starting from two phenyl propane derivatives,opening up a powerful new approach for lignan synthesis,which is showcased by succinct total syntheses of two biologically important aryltetralin-type lignans,β-apopicropodophyllin and *** the mild and operationally simple conditions,the developed chemistry might have a promising prospect in potential industrial applications.

关键词： [3+2]cycloaddition transition-metal catalysis tetrahydrofuran lignans natural products

Bioactive compounds in Hericium erinaceus and their biological properties:a review

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第4期13卷 1825-1844页

作者： yue Qiu Genglan Lin weiming Liu Fuming Zhang Robert J.Linhardt Xingli Wang Anqiang Zhang College of Food Science and Engineering Zhejiang University of TechnologyHangzhou 310014China Zhejiang Biosan Biotech Co. Ltd.Hangzhou 310052China Department of Chemical and Biological Engineering Center for Biotechnology and Interdisciplinary StudiesRensselaer Polytechnic InstituteTroyNY 12180USA Departments of Chemistry and Chemical Biology and Biomedical Engineering Biological ScienceCenter for Biotechnology and Interdisciplinary StudiesRensselaer Polytechnic InstituteTroyNY 12180USA

Hericium erinaceus is a nutritious edible and medicinal fungi,rich in a variety of functional active ingredients,with various physiological functions such as antioxidation,anticancer,and enhancing *** is also effective in protecting the digestive system and preventing neurodegenerative *** this review paper,we summarize the sources,structures and efficacies of the main active components in *** fruiting body,mycelium,and culture media,and update the latest research progress on their biological activities and the related molecular *** on this information,we provide detailed challenges in current research,industrialization and information on the active ingredients of *** for future studies and new applications of *** are proposed.

关键词： Hericium erinaceus Bioactive compounds Biological activities Antioxidation Neuroprotection Immunoregulation

基于瘦煤煤质特性的炼焦配煤方案优化试验研究

在线全文

学校读者我要写书评

暂无评论

煤质技术 2024年第2期39卷 73-79,86页

作者：岳伟明周文艳侯晓瑞周瑞李鹄飞申岩峰王美君山西焦化股份有限公司山西洪洞041606 太原理工大学省部共建煤基能源清洁高效利用国家重点实验室山西太原030024 太原理工大学煤科学与技术教育部重点实验室山西太原030024

在炼焦配煤中合理利用瘦煤并提升其占比,可实现焦化企业降本增效和保护优质炼焦煤资源。为探究焦化厂配煤方案中瘦煤比例添加及方案优化调整对焦炭质量的影响,选取贫瘦煤(MC)和瘦煤(LC1和LC2)及采用工业分析、岩相分析等了解单种煤的基... 详细信息

在炼焦配煤中合理利用瘦煤并提升其占比,可实现焦化企业降本增效和保护优质炼焦煤资源。为探究焦化厂配煤方案中瘦煤比例添加及方案优化调整对焦炭质量的影响,选取贫瘦煤(MC)和瘦煤(LC1和LC2)及采用工业分析、岩相分析等了解单种煤的基本煤质特性,利用红外光谱、热重分析确定煤样的结构特征和挥发分释放行为,并基于瘦煤的煤质特性,采用40 kg焦炉试验对不同瘦煤比例的配合煤进行焦炭质量评价,探究焦炭质量差异原因。结果表明:基于基础配煤方案,将LC1和LC2的占比增加至35%时,焦炭反应性(CRI)降低,反应后强度(CSR)升高,焦炭质量依然优于基础方案所制备的焦炭质量;在基础方案中,MC能对LC1和LC2进行替换,且替换后的CRI降低及CSR升高,焦炭光学组织中的细粒和中粒镶嵌结构增加,焦炭质量未发生劣化;MC占比增加至11%时,CRI升高以及CSR降低,焦炭质量发生明显劣化。基于瘦煤的煤质特性,配煤中的瘦煤比例可达到较高的配比,为后续工业配煤方案中利用高阶煤提供理论依据。

关键词：瘦煤煤质特性炼焦配煤方案 40 kg焦炉焦炭反应性焦炭质量焦炭光学组织

6-8 Volume Production of HWR010 Cavities in IMP

在线全文

学校读者我要写书评

暂无评论

IMP & HIRFL Annual Report 2015年第1期 269-270页

作者： yue weiming Zhang Shenghu He Yuan Linac Group 不详

The development of the Half Wave Resonator (HWR010) is based on the China ADS project. The HWR010 operates at 162.5 MHz and can provide more than 0.78 MV of accelerating voltage per cavity for proton with opt=0.10. The goal of the RF properties is to get a lower heat load and a higher accelerating gradient, which are determined by a higher R/Q0 and lower peak surface fields (Bpk/Eacc and Epk/Eacc). In order to optimize the HWR geometry parameters, CST-MWS is used to conduct the RF simulation. The optimized RF parameters are show in Table 1.

关键词： HWR010 Cavities IMP

6 - 11 IMP Superconducting HWR Design, Fabrication and Cold Test

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IMP & HIRFL Annual Report 2012年第1期 251-253页

作者： yue weiming Zhang Shenghu He Yuan Chang Wei You Zhiming Guo Xiaohong Xiong Pingran

6 - 15 Vertical and Horizontal Test of Superconducting Half Wave Resonator for Injector II in C-ADS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IMP & HIRFL Annual Report 2013年第1期 243-244页

作者： yue weiming Zhang Shenghu He Yuan Chang Wei You Zhiming Li Chunlong Zhang Junhui Zhao Hongwei

IMP HWR010 Mechanical Optimization Design

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IMP & HIRFL Annual Report 2017年第1期 236-237页

作者： yue weiming Zhang Shengxue Huang Lvlu Zhang Cong Evgeny Zaplatin Tan Teng Zhang Shenghu He Yuan 不详

SRF cavities are the common accelerating structures for many accelerators *** a series of external loads on the resonator walls predetermine the main working conditions of the SC cavities,the detailed investigation of their mechanical properties should be conducted in parallel with the main RF *** effects of very high electromagnetic fields that result in strong Lorentz forces and the pressure on cavity walls from the helium tank that also deforms the cavity shape,the tuning scheme resulting in the change of accelerating field profile and mechanical eigen resonance of cavities which are the main source of the microphonics must be taken into account during integrated design of the resonator and its liquid helium vessel.

关键词： walls cavity Lorentz

Relationship between Cavity String Assembling in Cleanroom and the Onset of Field Emission

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IMP & HIRFL Annual Report 2017年第1期 240-241页

作者： Xiong Pingran Song Yukun Shi Zhixiong Guo Hao You Zhiming Jiang Tiancai Zhang Shengxue yue weiming Li Yongming Zhang Shenghu He Yuan 不详

The pilot ADS project hosted by IMP and IHEP,which aims to produce a CW proton beam with beam current 10 mA@25 MeV,has successfully ejected out a pulsed proton beam with beam current 12.6 mA@26.1 *** has four cryomodules,totally 22 superconducting *** first two cryomodules,each consists of six Half Wave Resonators(HWRs)with=0.1,have the same *** third cryomodule is made up of five tapered HWRs with=*** first three cryomodules are supplied by IMP and the fourth one by IHEP,which consists of five elliptical cavities with=*** paper will show some interesting results about cavity string assembling in cleanroom and the onset of field emission.

关键词： structure. beam totally

6-11 SRF Power Input Coupler for HWR010 at IMP

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IMP & HIRFL Annual Report 2016年第1期 257-258页

作者： Li Yongming Jiang Tiancai Wang Ruoxu Zhang Shenghu yue weiming Xiong Pingran Li Chunlong Liu Lubei Zhang Shengxue Song Yukun He Yuan 不详

The high power superconducting radiofrequency(SRF)input coupler is the connecting part between the SRF cavity and the RF transmission *** the RF power transferred through the coupler,the SRF cavity can built up the electromagnetic field and then accelerate the *** addition to this RF transmission function,it also has to serve as a vacuum barrier for the SRF cavity *** HWR010 coupler which designed by IHEP is a single ceramic window coupler.

关键词：