检索结果-南通市图书馆

Progress in Natural Science:Materials International 2022年第4期32卷 510-516页

作者： Mengyuan Yue Huinan Guo Zhaoxia Yuan weiqin li Yafei liu Kai Chen Yusang Guo Yijing Wang Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center College of Chemistry Nankai University

Sodium-ion batteries（SIBs） have been recently considered as an intriguing candidate for next-generation battery systems with their advantages in large-scale energy storage applications. However, the design of electrode materials of SIBs still suffers from severe volume expansion and low capacity caused by the larger ion radius, high redox potential and heavy atom weight of Na. Organic electrode materials with structural flexibility have attracted great attention recently for their potential in alleviating volume expansion. However, most organic electrode materials suffer from dissolution in electrolytes and consequent capacity fading during the long-term cycling process. In this work, a method coordinating with Co2+was applied to solve the shuttle effect of H4salphdc(N, N'-phenylene-bis-（salicylideneimine） dicarboxylic acid). By virtue of the Co2+coordination, the Co（H2salphdc）electrode delivered a desirable discharge capacity of 123 m Ah g-1after 1500 cycles at the current density of 200m A g-1, while the H4salphdc electrode exhibited severe capacity fading. Such excellent electrochemical performance can be credited to the Co2+coordination repressing the electrode dissolution and improving the structure stability.

关键词： Double-Schiff-base Sodium-ion battery Shuttle effects

Rational design of MnS nanoparticles anchored on N,S-codoped carbon matrix as anode for lithium-ion batteries

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2021年第5期31卷 649-655页

作者： weiqin li Mengyuan Yue Huinan Guo Zhaoxia Yuan Yafei liu Kai Chen Juming Gu Yijing Wang Key Laboratory of Advanced Energy Materials Chemistry Ministry of Education Renewable Energy Conversion and Storage Center College of Chemistry Nankai University Quick Gem Optoelectronic S and T Co. Ltd.

The manganese sulfide(MnS) has attracted more attention as anode material on energy storage and conversion field, owing to its high theoretical capacity(616 mA h g-1) and good electrochemical activity. However, low electronic conductivity and large volume expansion during charge-discharge processes have limited its further application. In order to address above mentioned problems, the composites, MnS nanoparticles embedded in N,Scodoped porous carbon skeleton(named as MnS/N,S–C composites), herein have been prepared successfully using metal organic framework(Mn-NTA) as template. The porous carbon skeleton not only can enhance electrode conductivity, but also relieve volume expansion during charge-discharge processes. Thus, the rational design towards electrode architectures has endowed MnS/N,S–C nanocomposites with superior electrochemical performance, which delivers the specific capacities of 676.7 mA h g-1at the current density of 100 mA g-1.

关键词： N S-codoped MnS Nanocomposites Rods-like lithium ion batteries

Hypertriglyceridemia and acute pancreatitis:clinical and basic research—a narrative review

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Pancreatology 2024年第1期7卷 53-60页

作者： lin Gao weiqin li Center of Severe Acute Pancreatitis(CSAP) Department of Critical Care MedicineJinling HospitalMedical School of Nanjing UniversityNanjing 210002JiangsuChina

Hypertriglyceridemia(HTG)is the third most common cause of acute pancreatitis(AP),and the incidence of HTG-induced AP(HTG-AP)is rising worldwide as a result of changes in lifestyle and dietary *** China,HTG accounts for 10%to 20%of the causes of AP,even becoming the second leading cause of *** presentation and diagnosis of HTG-AP is similar to that of AP from other causes,however,the complication rates and severe AP are significantly higher in patients with HTG-AP than in patients with other *** the management of HTG-AP,the initial management is similar to that of AP from other causes and mainly includes fluid resuscitation,pain control,and nutritional *** addition to supportive care,it is necessary to take appropriate measures to decrease serum TG levels,in order to alleviate the progression of AP and prevent *** review aims to summarize existing clinical and basic research evidence of HTG-AP and seeks to highlight the epidemiology,definition,pathogenesis,clinical course,diagnosis,management,prevention of recurrence,and specific clinical scenarios,such as HTG-AP during pregnancy,HTG-AP with diabetic ketoacidosis.

关键词： Acute pancreatitis Basic research Clinical research Hypertriglyceridemia Narrative review

在线全文

学校读者我要写书评

暂无评论

基于策略和流分类的MPLS显式路由算法

北京航空航天大学学报 2007年第9期33卷 1103-1106页

作者：黄河李蓬李伟琴北京航空航天大学软件学院北京100083 北京建筑工程学院电气与信息工程学院北京100037 北京航空航天大学计算机学院北京100083

提出一种基于策略和流分类的多协议标记交换(MPLS,Multi-Protocol Label Switch)流量工程显式路由算法,算法分离线计算和在线计算2个步骤实施.离线计算基于多商品流问题,计算使网络总体资源耗费最低,并且能够满足流的带宽需求的每链路... 详细信息

提出一种基于策略和流分类的多协议标记交换(MPLS,Multi-Protocol Label Switch)流量工程显式路由算法,算法分离线计算和在线计算2个步骤实施.离线计算基于多商品流问题,计算使网络总体资源耗费最低,并且能够满足流的带宽需求的每链路每流带宽分配值.在线计算根据这种带宽分配结果,实时计算最短路径作为单个流的显式路由.离线计算和在线计算相结合可使网络流按照其固有的流量分布特征合理地映射到网络物理拓扑中,在一定程度上避免了因路由计算不合理而导致的网络性能退化和资源使用不均衡等问题.算法综合考虑网络流量、资源、管理策略等要素,能够较好地平衡网络资源的使用,提高网络资源利用率,有效实施MPLS流量工程.

关键词：多协议标记交换流量控制服务质量流量工程显式路由

在线全文

学校读者我要写书评

暂无评论

数百eV低能电子束照射电介质样品带电效应

固体电子学研究与进展 2018年第2期38卷 95-100,105页

作者：李维勤李超西安理工大学自动化与信息工程学院西安710048 西安应用光学研究所西安710065

结合数值模拟和实验测量,以石英样品为例,研究了低于1keV的低能电子束照射下的动态带电特性。结果表明,使得电子总产额σ为1的第一临界能量约为200eV;随着电子束照射,表面电位逐渐趋于稳定;σ逐渐增大至一个略小于1的稳定值。随着电子... 详细信息

结合数值模拟和实验测量,以石英样品为例,研究了低于1keV的低能电子束照射下的动态带电特性。结果表明,使得电子总产额σ为1的第一临界能量约为200eV;随着电子束照射,表面电位逐渐趋于稳定;σ逐渐增大至一个略小于1的稳定值。随着电子束能量的增大,σ从不同初始值变化到相同稳定值的暂态时间基本不变;表面电位随电子束能量变化在约600eV时呈现一个极大值。随着束流的增大,暂态过程更容易趋于稳定。

关键词：电介质电子产额二次电子表面电位

Maternal serum branched-chain amino acids in early pregnancy and offspring growth patterns from 1 year to 8 years of age

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2024年第15期137卷 1876-1878页

作者： Ninghua li Junhong Leng Rui Zhang Hui Wang weiqin li Shuang Zhang Yijuan Qiao Jing li Zhijie Yu Gang Hu Zhongze Fang Xilin Yang Department of Epidemiology and Biostatistics School of Public HealthTianjin Medical UniversityTianjin 300070China Project Office Tianjin Women and Children’s Health CenterTianjin 300070China Tianjin Key Laboratory of Environment Nutrition and Public HealthTianjin 300070China Tianjin Center for International Collaborative Research on Environment Nutrition and Public HealthTianjin 300070China Population Cancer Research Program and Department of Pediatrics Dalhousie University15000HalifaxCanada Chronic Disease Epidemiology Laboratory Pennington Biomedical Research CenterBaton RougeLA 70808USA Department of Toxicology and Sanitary Chemistry School of Public HealthTianjin Medical UniversityTianjin 300070China

to persist into adulthood and be associated with many adverse health outcomes later in adulthood,including cardiovascular diseases and type 2 diabetes.[1]In utero exposure to“undernutrition”or“over-nutrition”plays an important role in obesity in childhood and diseases in adulthood.[2]It is established that high branchedchain amino acids(BCAAs)are associated with insulin resistance and gestational diabetes mellitus(GDM).[3]However,it is largely unknown whether in utero exposure to high BCAAs also plays a role in adverse childhood growth *** used 8-year children follow-up data of a case-control study nested within a population-based prospective cohort of pregnant women in Tianjin,China,to examine associations between maternal BCAAs levels in early pregnancy and obesity-related growth patterns if any,in offspring at 1-8 years of age.

关键词： BCAA pregnancy obesity

在线全文

学校读者我要写书评

暂无评论

压力封闭式苛化技术集成及装备

中国造纸 2022年第S1期41卷 127-132页

作者：李卫芹汶瑞机械(山东)有限公司山东潍坊262100

主要介绍了压力封闭式苛化技术的工艺流程、主要工艺参数、关键设备和系统工艺的优点。该工艺具有生产效率高、浓白液收获率高、白液澄清度高、节约能源、自动化程度高等优势特点。可满足日处理白液量为2000~10000 m3压力苛化的集成化技... 详细信息

主要介绍了压力封闭式苛化技术的工艺流程、主要工艺参数、关键设备和系统工艺的优点。该工艺具有生产效率高、浓白液收获率高、白液澄清度高、节约能源、自动化程度高等优势特点。可满足日处理白液量为2000~10000 m3压力苛化的集成化技术,实现了装备全部国产化,单线能满足年产100万t及以下规模的化学木浆和其他浆种苛化工程的建设配套。

关键词：碱回收压力苛化压力盘式过滤机白泥盘式过滤机白液白泥

Research Progress on Serum Porphyrin and Chronic liver Disease

在线全文

学校读者我要写书评

暂无评论

Journal of Clinical and Nursing Research 2022年第3期6卷 221-228页

作者： Xia Wang Yu Cai weiqin li Yuanyuan Jia Jiangfeng Fu Yaping Ni Kaige liu Department of General Medicine The First Affiliated Hospital of Xi'an Medical UniversityXi'an 710000China Department of General Surgery The First Affiliated Hospital of Xi'an Medical UniversityXi'an 710000China Department of Neonatology The First Affiliated Hospital of Xi'an Medical University Xi'an 710000China Faculty Development and Teaching Evaluation Office The First Affiliated Hospital of Xi'an Medical UniversityXi'an 710000China Department of Gastroenterology The First Affiliated Hospital of Xi'an Medical University Xi'an 710000China

liver cirrhosis is an important cause of chronic liver *** present,a breakthrough has been achieved in the development of chronic hepatitis C treatment,but there is no effective measure to completely cure chronic hepatitis *** are a class of macromolecular heterocyclic compounds formed by interconnecting the a-carbon atoms of four pyrrole-like substituents through hypomethyl *** and their derivatives widely exist in organelles related to energy transfer in *** are mainly involved in the synthesis of heme in human *** is an iron-containing porphyrin compound,15-20% of which is synthesized and utilized in the *** have found that porphyrin metabolism disorder can occur in patients with chronic liver *** early stage of viral hepatitis is accompanied by increased production of porphyrins and their compounds,increased levels of peripheral circulating porphyrins,porphyrin cholestasis,and biochemical changes of free porphyrins which precede the histological *** accumulation of serum and liver protoporphyrins and the oxidative stress can cause liver and extrahepatic *** the one hand,porphyrin metabolism disorder can aggravate chronic liver disease,and even progress to liver cirrhosis and liver *** the other hand,chronic liver disease can also aggravate porphyrin metabolism disorder,recurrent attacks,and damage to liver and extrahepatic tissues and organs.

关键词： Viral hepatitis Chronic hepatitis B Hemoglobin Protoporphyrin Porphyrin

假说—演绎法在“分离定律”教学中的运用误区与实践改进

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

生物学教学 2024年第11期49卷 24-26页

作者：李伟琴浙江省台州中学台州317000

假说—演绎法是一种重要的科学研究方法。本文以高中生物学“分离定律”内容的课堂教学为例,通过情境—任务—活动—评价四个教学环节,引导学生体验孟德尔用假说—演绎法发现分离定律的过程,促进学生科学探究和科学思维素养的发展。

关键词：假说—演绎法课堂教学分离定律

儿童川崎病丙种球蛋白治疗前后血清25-羟维生素D_3及白介素6水平的变化及意义

在线全文

学校读者我要写书评

暂无评论

南方医科大学学报 2014年第8期34卷 1230-1232页

作者：陈艳丽李伟琴西安医学院附属医院陕西西安710077

目的通过检测川崎病(KD)患儿丙种球蛋白治疗前后血清25-羟维生素D3[(25-(OH)D3)]及白介素6(IL-6)水平,探讨其与川崎病的关系。方法选取在我院住院的KD患儿35例,检测丙种球蛋白治疗前后血清25-(OH)D3和IL-6水平,并选取25例呼吸道感染发... 详细信息

目的通过检测川崎病(KD)患儿丙种球蛋白治疗前后血清25-羟维生素D3[(25-(OH)D3)]及白介素6(IL-6)水平,探讨其与川崎病的关系。方法选取在我院住院的KD患儿35例,检测丙种球蛋白治疗前后血清25-(OH)D3和IL-6水平,并选取25例呼吸道感染发热患儿作为发热对照组,25例正常儿童作为正常对照组,分别检测其血清25-(OH)D3和IL-6值,并对各组进行比较。结果 KD治疗前25-(OH)D3水平:正常儿童较发热儿童高(P=0.025);KD患儿较正常儿童高(P=0.023),均有统计学意义;血清IL-6水平:发热儿童虽较正常儿童高(P=0.4),但差异无统计学意义,KD患儿较发热儿童高(P=0.000),差异有统计学意义;将25-(OH)D3与IL-6水平进行相关分析,r=0.9,P=0.000。血清25-(OH)D3水平在丙种球蛋白治疗后较治疗前明显升高(P=0.012),差异有统计学意义;血清IL-6水平在丙种球蛋白治疗后较治疗前降低(P=0.325),但差异无统计学意义;治疗后血清25-(OH)D3与IL-6水平无相关性(r=0.18,P=0.4)。结论 KD患儿治疗前血清25-(OH)D3与IL-6水平呈正相关,治疗后无明显相关。25-(OH)D3可能参与KD的发病,可作为KD的潜在治疗靶点。

关键词：川崎病 25-(OH)D3 IL-6