检索结果-南通市图书馆

ligand enabled none-oxidative decarbonylation of aliphatic aldehydes

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第7期34卷 107-111页

作者： Bo li Shihao liu Wu Fan Xiaotong Shen Jing Xu suhua li School of Chemistry Sun Yat-Sen UniversityGuangzhou 510275China Key Laboratory of Tobacco Flavor Basic Research Zhengzhou Tobaco Research Institute of CNTCZhengzhou 450001China

Decarbonylation of aldehydes is a basic organic transformation, which has been developed for more than six-decade. However, as comparing to well-studied aromatic aldehydes, fewer examples for catalytic decarbonylation of aliphatic aldehydes were reported, mainly on simple or special *** α-bulky or highly functionalized ones, stoichiometric Rh(I) were usually required for decent ***, we present a rare example of Ir(I)-catalyzed direct decarbonylation of α-quaternary aldehydes with broad substrate scope and good functional group compatibility via judicious selection of ligand. Theα-chirality is memorized in this decarbonylation process. In addition, we report a broad-spectrum decarbonylation of α-secondary and α-tertiary aldehydes containing multifunctional groups with an improved Rh(I)/DPPP recipe. Finally, we realized selective decarbonylation of α-tertiary aldehydes in the presence of α-quaternary one via the reactivity differences.

关键词： Decarbonylation Aliphatic aldehydes Rhodium Iridium ligand

血糖变异性与糖尿病肾脏疾病相关性的研究进展

在线全文

学校读者我要写书评

暂无评论

医学综述 2025年第1期31卷 75-79页

作者：白兆玲黄萱李素华新疆医科大学第一附属医院肾脏疾病中心乌鲁木齐830054 新疆维吾尔自治区肾脏病研究所乌鲁木齐830054 新疆肾脏替代治疗临床医学研究中心乌鲁木齐830054

糖尿病肾脏疾病(DKD)是由糖尿病引起的慢性肾脏病,是糖尿病患者中的常见疾病,可以导致肾功能受损,从而引起肾功能病变,甚至导致终末期肾病。DKD的病因包括肾小管纤维化、系膜肥大、炎症细胞渗出、细胞外基质结构的形成以及肾脏内足细胞... 详细信息

糖尿病肾脏疾病(DKD)是由糖尿病引起的慢性肾脏病,是糖尿病患者中的常见疾病,可以导致肾功能受损,从而引起肾功能病变,甚至导致终末期肾病。DKD的病因包括肾小管纤维化、系膜肥大、炎症细胞渗出、细胞外基质结构的形成以及肾脏内足细胞的自我修复。血糖变异性是影响DKD的危险因素,在严格控制血糖基础上减少血糖波动也是阻止DKD进展的关键因素。目前已知血糖变异性与氧化应激、炎症和内皮功能障碍等有关,但具体的分子机制、信号通路等尚不十分清楚。未来需要进一步研究血糖波动触发这些病理生理过程的机制,以及它们之间的相互作用和调控网络,以明确血糖变异性导致糖尿病并发症的机制。

关键词：糖尿病肾脏疾病血糖波动糖尿病

Virtual straightening of scraper conveyor based on the position and attitude solution of industrial robot model

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

International Journal of Coal Science & Technology 2021年第5期8卷 1149-1170页

作者： suhua li Jiacheng Xie Fang Ren Xin Zhang Xuewen Wang Binbin Wang Shanxi Key Laboratory of Fully Mechanized Coal Mining Equipment College of Mechanical and Vehicle EngineeringTaiyuan University of TechnologyTaiyuan 030024China

The movement of the floating connecting mechanism between a hydraulic support and scraper conveyor is space movement;thus,when the hydraulic support pushes the scraper conveyor,there is an error between the actual distance of the scraper conveyor and the theoretical moving *** a result,the scraper conveyor cannot obtain the straightness ***,the movement law of the floating connecting mechanism between the hydraulic support and scraper conveyor is analyzed and programmed into the Unity3D to realize accurate pushing of the scraper conveyor via hydraulic *** Coal Seam?Equipment Joint Virtual Straightening System is established,and a straightening method based on the motion law of a floating connection is proposed as the default method of the *** addition,a straightening simulation of the scraper conveyor was performed on a complex coal seam floor,the results demonstrate that the average straightening error of the scraper conveyor is within 2-8 mm,and is in direct proportion to the fluctuation of the coal seam floor in the strike of the seam with high accuracy,the straightness of scraper conveyor is more affected by the subsidence terrain during straightening than by the bulge *** some conclusions are verified by *** on the verification of the relevant conclusions,a comparison and analysis of Longwall Automation Steering Committee(LASC)straightening technology and default straightening method in the simulation system shows that the straightness accuracy of LASC straightening technology under complex floor conditions is slightly less than that of the default straightening method in the proposed system.

关键词： Virtual reality Scraper conveyor Hydraulic support Posture solution Straightness control

Haplotype-resolved and chromosome-level genome assembly of Colorado potato beetle

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

Journal of Genetics and Genomics 2023年第7期50卷 532-535页

作者： Ziqi Ye Ruirui Lu Chao li Doudou Yang Zhuozhen Zeng Weichao lin Jie Cheng Zhongmin Yang li Wang Yulin Gao Sanwen Huang Xingtan Zhang suhua li Shenzhen Branch Guangdong Laboratory of Lingnan Modern AgricultureKey Laboratory of Synthetic BiologyMinistry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenGenome Analysis Laboratory of the Ministry of Agriculture and Rural AffairsChinese Academy of Agricultural SciencesShenzhenGuangdong 518000China Key Laboratory of Prevention and Control of Invasive Alien Species in Agriculture&Forestry of the North-western Desert Oasis Ministry of Agriculture and Rural AffairsCollege of AgronomyXinjiang Agricultural UniversityUrumqiXinjiang Uygur Autonomous Region 830052China School of life Sciences Henan UniversityKaifengHenan 475004China Shenzhen Research Institute of Henan University ShenzhenGuangdong 518000China College of Horticulture Xinjiang Agricultural UniversityUrumuqiXinjiang Uygur Autonomous Region 830052China State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193China Chinese Academy of Tropical Agricultural Sciences HaikouHainan 571101China

As the most important non-cereal food crop,potatoes are a staple food for 1.3 billion people(Stokstad,2019).However,these cultivated potatoes are challenged with multiple biotic stresses(i.e.,pathogens and pests),some of which can evade host resistance,leading to a serious dampening of potato *** of these pests is the Colorado potato beetle(hereafter referred to as CPB,Leptinotarsa decemlineata Say).CPB is a member of the order Coleoptera,and originated in the southwestern United States and Mexico(Alyokhin et al.,2008).

关键词： originated hereafter

The “1-3-7” Approach to Malaria Surveillance and Response--Henan Province, China, 2012−2018

在线全文

学校读者我要写书评

暂无评论

China CDC weekly 2020年第17期2卷 289-292页

作者： Qunqun Zhang Ying liu Yabo Hu Yuling Zhao Chengyun Yang Dan Qian Ruimin Zhou suhua li Zhou Guan Deling Lu Hongwei Zhang Wanshen Guo Henan Center for Disease Prevention and Control ZhengzhouChina College of Public Health Zhengzhou UniversityZhengzhouChina.

What is already known about this topic?The“1-3-7”approach to malaria surveillance and response was a key measure for malaria elimination in China and was first introduced into the World Health Organization(WHO)as an international guideline for malaria surveillance and response in *** is added by this report?The“1-3-7”approach was well implemented in Henan Province from 2012−*** this study period,a total of 1,294 malaria cases were detected and reported,and all cases were diagnosed and reported within 1 day with 99.23%(1,284/1,294)of cases were investigated within 3 *** addition,93.7%(1,212/1,294)of foci were investigated and vector control was implemented within 7 days at all residual non-active foci to prevent further *** are the implications for public health practice?The“1-3-7”controlling pattern would be an effective and approachable method for implementation especially in malaria-eliminating countries and regions,but the interval from symptom onset to diagnosis cannot be ***,the roles and responsibilities that all actors involved in the health sector must be specified too.

关键词： Henan specified eliminating

四川盆地资阳地区龙王庙组优质储层识别与分布预测

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

海相油气地质 2017年第1期22卷 55-61页

作者：李素华中国石化西南油气分公司勘探开发研究院

四川盆地资阳地区龙王庙组局限台地台内滩沉积厚度薄,且在工区西北部剥蚀尖灭,有效识别资阳地区龙王庙组优质储层分布是油气取得突破的关键。基于ZY1井及三维地震资料,在储层精细标定及层位解释基础上,首先利用地震相及振幅属性刻画有... 详细信息

四川盆地资阳地区龙王庙组局限台地台内滩沉积厚度薄,且在工区西北部剥蚀尖灭,有效识别资阳地区龙王庙组优质储层分布是油气取得突破的关键。基于ZY1井及三维地震资料,在储层精细标定及层位解释基础上,首先利用地震相及振幅属性刻画有利的沉积相带,再结合分频属性及波阻抗反演确定有利储层的边界及厚度,最终利用古地貌及裂缝预测确定优质白云岩储层的空间分布规律。综合预测结果表明,资阳地区龙王庙组储层纵向上主要分布在中上部,横向上主要发育两个呈北东向条带状展布的滩体。工区西北部位于二叠系沉积前的古地貌高部位,且暴露剥蚀区更易形成有利的溶蚀孔隙型白云岩储层,是有利的油气聚集区带。

关键词：四川盆地下寒武统龙王庙组碳酸盐岩储层储层预测

在线全文

学校读者我要写书评

暂无评论

日本民主党兴起的政治社会基础

当代亚太 2007年第10期 47-54,64页

作者：李素华中国社会科学院亚太研究所

日本民主党自1996年成立以来,不断发展壮大,成为仅次于自民党的第二大党。本文从三个方面分析了民主党兴起的政治社会基础,其一是冷战后日本政治的整体保守化,其二是各政党的分裂与合并,其三是日本社会的变迁。从中可见经济、科技与社... 详细信息

日本民主党自1996年成立以来,不断发展壮大,成为仅次于自民党的第二大党。本文从三个方面分析了民主党兴起的政治社会基础,其一是冷战后日本政治的整体保守化,其二是各政党的分裂与合并,其三是日本社会的变迁。从中可见经济、科技与社会变迁等因素对政党兴衰的影响。

关键词：日本民主党政党兴衰

在线全文

学校读者我要写书评

暂无评论

预制桩竖向承载性能设计理论研究

岩石力学与工程学报 2001年第2期20卷 256-261页

作者：李素华杨位洸广东省建筑科学研究院广州510500 华南理工大学土木工程系广州510641

对预制桩的竖向承载性能进行计算研究 ,提出了一种分析预制桩竖向承载性能的新方法。将优化反分析理论与改进的弹性理论法相结合 ,所编制的预制桩轴向承载性能优化反分析计算程序 ,不仅可模拟计算预制桩静载试验的荷载沉降曲线 ,而且可... 详细信息

对预制桩的竖向承载性能进行计算研究 ,提出了一种分析预制桩竖向承载性能的新方法。将优化反分析理论与改进的弹性理论法相结合 ,所编制的预制桩轴向承载性能优化反分析计算程序 ,不仅可模拟计算预制桩静载试验的荷载沉降曲线 ,而且可根据静载试验实测的桩顶荷载沉降曲线反演分析计算出桩周土力学参数。对大量的静载试验资料进行优化反分析计算 ,并对所得到的土力学参数进行统计分析 ,得出一整套较能反映实际、实用可靠的土力学参数值。

关键词：预制桩弹性理论法优化理论竖向承载力

在线全文

学校读者我要写书评

暂无评论

政治认同的辨析

当代亚太 2005年第12期 15-22页

作者：李素华中国社会科学院亚太研究所

本文首先评述了各种关于认同的理论,在此基础上提出认同的涵义和特征。然后对比分析各种政治认同理论,并提出了本文对政治认同的概念界定:公民对某种政治权力的认同,即公民对某种政治权力的承认、赞同和同意,并且自觉地以该政治权力的... 详细信息

本文首先评述了各种关于认同的理论,在此基础上提出认同的涵义和特征。然后对比分析各种政治认同理论,并提出了本文对政治认同的概念界定:公民对某种政治权力的认同,即公民对某种政治权力的承认、赞同和同意,并且自觉地以该政治权力的要求来规范自己的政治行为。政治认同主要是指一个稳定政治体系即一个国家执政的政治权力如何获得所需要的认同。

关键词：认同政治认同概念