检索结果-南通市图书馆

Symptoms associated with nucleic acid turning-negative-time in COVID-19 patients?

Acupuncture and Herbal Medicine 2022年第3期2卷 207-209页

作者： Qiang Li Lei Zhang limin feng Hongyuan Sun Yan Ma Xiaoya Liu Cunzhong Shi Mingchi Luo Second Teaching Hospital of Tianjin University of Traditional Chinese Medicine TianjinChina Tianjin Hospital TianjinChina The First Hospital Affiliated to Tianjin University of Traditional Chinese Medicine TianjinChina

Objective:To explore on the association between nucleic acid turning-negative-time and traditional Chinese medicine(TCM)symptoms in coronavirus disease 2019(COVID-19)patients with the Omicron variant.Method:For this retrospective cross-sectional study,we enrolled 189 patients with COVID-19(age 20-90 years)were included.multiple linear regression models were used to investigate the TCM symptoms affecting the nucleic acid turning-negative-time of COVID-19 patients,during the process of data analysis,taking with nucleic acid turning-negative-time as the dependent variable,and TCM symptoms as independent variables,and at the same time,sex,age,hypertension,diabetes,and coronary heart disease were as confounding variables.Results:The study found that the most common TCM symptoms of COVID-19 patients with Omicron were cough,dry throat,expectoration,fever,sore throat,pharyngeal itching,running nose,and nasal congestion.Regression analysis showed that the fit regressive equation showed a significant difference(F=4.286,P<0.001),R=0.400,the adjusted R^(2)=0.123,and three variables in the regression equation showed significant difference(P<0.05).The results showed that nucleic acid turningnegative-time was mostly related to constipation,fever,and expectoration.If the patients had the symptoms of constipation,fever,and expectoration;that is,if patients showed these symptoms,the turning-negative-time of nucleic acid in patients with Omicron will be prolonged.Conclusions:Treatment based on symptoms for patients with constipation,fever,and expectoration may have important clinical significance for the COVID-19 patients with Omicron.

关键词： COVID-19 Omicron TCM symptoms nucleic acid turning-negative-time

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Efficacy of intrauterine balloon stent or oral estrogen on prevention of adhesion after transcervical resection of septum in septate uterus:Study protocol for a randomized controlled multicenter study in China

引用

Chinese Medical Journal 2023年第24期136卷 3016-3018页

作者： Shan Deng Zichen Zhao limin feng Xiaowu Huang Sumin Wang Xiang Xue Lei Yan Baorong Ma Lijuan Hao Xueying Li Lihua Yang Lan Zhu Department of Obstetrics and Gynecology National Clinical Research Center for Obstetric&Gynecologic DiseasesPeking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China Department of Obstetrics and Gynecology Beijing Tiantan HospitalCapital Medical UniversityBeijing 100070China Department of Hysteroscopic Center Fuxing HospitalCapital Medical UniversityBeijing 100038China Nanjing Maternity and Child Health Care Hospital Jiangsu Province 210004China The Second Affiliated Hospital of Xi’an Jiaotong University Shanxi Province 710004China Center for Reproductive Medicine Cheeloo College of MedicineShandong UniversityShandong Province 250012China Tianjin Central Hospital of Obstetrics and Gynecology Tianjin 300199China Chongqing Health Center for Women and Children Chongqing 401147China Hunan Provincial Maternal and Child Health Care Hospital Hunan Province 410008China Tangshan Maternal and Child Health Care Hospital Hebei Province 063000China

To the Editor:The septate uterus is the most common uterine anomaly and is associated with an increased risk of adverse reproductive outcomes.Transcervical resection of septum(TCRS)is widely performed in patients with adverse reproductive outcomes.The incidence of de novo intrauterine adhesions(IUAs)after TCRS is approximately 5%to 25%.[1]Various anti-adhesion methods are widely used in the clinical management of patients with septate uteri,including intrauterine devices,Foley balloons,estrogen,antibiotics,and hyaluronic acid gel.However,insufficient evidence supports or opposes any of these methods(Level C),[2]lacking high-grade evidence.

关键词： prevention septum after

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Study of bias voltage effect on the performance of ta-C coating prepared by high power impulse magnetron sputtering

引用

China Welding 2024年第1期33卷 7-12页

作者：冯利民何哲秋严森李建中石俊杰 Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China

The mechanical and frictional properties of ta-C coatings deposited on the substrate surface affect applications in the field of cutting tools and wear-resistant components.In this paper,the effect of bias parameters on the performance of ta-C coatings was investigated based on high power impulse magnetron sputtering(HiPIMS)technology.The results show that bias voltage has a significant effect on the deposition rate,structure,and wear resistance of the coating.In the range of bias voltage−50 V to−200 V,the ta-C coating performance was the best under bias voltage−150 V.The thickness reached 530.4 nm,the hardness value reached 35.996 GPa,and the bonding force in-creased to 14.2 N.The maximum sp3 bond content was 59.53% at this condition.

关键词： bias voltage magnetron sputtering deposition rate wear resistance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Elusive cats in our backyards:persistence of the North Chinese leopard(Panthera pardus japonensis)in a human-dominated landscape in central China

引用

Integrative Zoology 2021年第1期16卷 67-83页

作者： Haitao YANG Bing XIE Guojing ZHAO Yinan GONG Pu MOU Jianping GE limin feng National Forestry and Grassland Administration Amur Tiger and Amur Leopard Monitoring and Research Center Northeast Tiger and Leopard Biodiversity National Observation and Research StationMinistry of Education Key Laboratory for Biodiversity Science and EngineeringCollege of Life SciencesBeijing Normal UniversityBeijingChina Behavioural Ecology Group Section for Ecology and EvolutionDepartment of BiologyUniversity of CopenhagenDenmark

The North Chinese leopard(Panthera pardus japonensis),the least-known big cat,disappeared in most historical range for decades,following the development of modern civilization.Unfortunately,we have scarce knowledge about the status of this big cat so far,apart from anecdotal reports.In this study,we investigated density,distribution,and habitat use of the leopard,the apex predator,in a complex forest landscape in the Loess Plateau.We used a camera-trapping network to obtain population estimates for leopards over 2 years through spatially explicit capture-recapture models.Our results,based on maximum likelihood and Bayesian/MCMC methods,reveal that the largest wild population of the leopard was found widely distributed in remnant forests in central Loess plateau.The population is increasing in our study area,and the density of leopards(1.70(SE=0.48)−2.40(SE=0.67)/100 km^(2))is higher than other areas of China.According to the analysis of 2 seasonal occupancy models,prey species drive partially the leopard habitat use,predicting that the big cat thrives from the recovery of prey community.However,human disturbances,especially oil wells,seem to have negative impacts on the habitat use of leopards.Specifically,it is necessary to have joint efforts by the government and researchers to improve human disturbances management and prey species population density,as well as strengthen the investment in research on the North Chinese leopard,which could all further strengthen protection ability and ensure the long-term survival of this species.

关键词： habitat use North Chinese leopard occupancy population size spatially explicit capture-recapture

来源：

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

离子氮化对高速钢表面类金刚石膜性能的影响

引用

材料与冶金学报 2024年第1期23卷 54-59,85页

作者：张涛冯利民李建中东北大学冶金学院沈阳110819 上海新弧源涂层技术有限公司上海201112

根据空心阴极原理,研究了离子氮化对高速钢表面渗氮层的厚度、硬度等影响.在此基础上,研究了气体体积配比对渗氮后高速钢表面沉积的类金刚石膜的结合力、sp3键含量和耐磨性能的影响.研究结果表明:离子氮化后,高速钢表面镀膜结合力明显提... 详细信息

根据空心阴极原理,研究了离子氮化对高速钢表面渗氮层的厚度、硬度等影响.在此基础上,研究了气体体积配比对渗氮后高速钢表面沉积的类金刚石膜的结合力、sp3键含量和耐磨性能的影响.研究结果表明:离子氮化后,高速钢表面镀膜结合力明显提高,由10.35 N提高至18.56 N;降低气体体积配比中CH_(4)的含量有利于提高膜层中sp3键的含量,高速钢耐磨性能明显提升,摩擦系数由0.175降至0.1.离子氮化可有效提高高速钢表面沉积的类金刚石膜性能.

关键词：高速钢离子氮化类金刚石膜结合力磨损性能

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Estimating abundance and density of Amur tigers along the Sino- Russian border

引用

Integrative Zoology 2016年第4期11卷 322-332页

作者： Wenhong XIAO limin feng Pu MOU Dale GMIQUELLE Mark HEBBLEWHITE Joshua FGOLDBERG Hugh SROBINSON Xiaodan ZHAO Bo ZHOU Tianming WANG Jianping GE State Key Laboratory of Earth Surface Processes and Resource Ecology Ministry of Education Key Laboratory for Biodiversity Science and Engineeringand College of Life SciencesBeijing Normal UniversityBeijingChina Wildlife Biology Program Department of Ecosystem and Conservation SciencesCollege of Forestry and ConservationUniversity of MontanaMissoulaMontanaUSA Wildlife Conservation Society BronxNew YorkUSA Department of Ecology Far Eastern Federal UniversityAyaksRusski IslandVladivostokRussia Evolution Ecology and Organismal Biology ProgramDepartment of BiologyUniversity of CaliforniaRiversideCaliforniaUSA Panthera New YorkNYUSA

As an apex predator the Amur tiger(Panthera tigris altaica)could play a pivotal role in maintaining the integrity of forest ecosystems in Northeast Asia.Due to habitat loss and harvest over the past century,tigers rapidly declined in China and are now restricted to the Russian Far East and bordering habitat in nearby China.To facilitate restoration of the tiger in its historical range,reliable estimates of population size are essential to assess effectiveness of conservation interventions.Here we used camera trap data collected in Hunchun National Nature Reserve from April to June 2013 and 2014 to estimate tiger density and abundance using both maximum likelihood and Bayesian spatially explicit capture-recapture(SECR)methods.A minimum of 8 individuals were detected in both sample periods and the documentation of marking behavior and reproduction suggests the presence of a resident population.Using Bayesian SECR modeling within the 11400 km2 state space,density estimates were 0.33 and 0.40 individuals/100 km^(2) in 2013 and 2014,respectively,corresponding to an estimated abundance of 38 and 45 animals for this transboundary Sino-Russian population.In a maximum likelihood framework,we estimated densities of 0.30 and 0.24 individuals/100 km^(2) corresponding to abundances of 34 and 27,in 2013 and 2014,respectively.These density estimates are comparable to other published estimates for resident Amur tiger populations in the Russian Far East.This study reveals promising signs of tiger recovery in Northeast China,and demonstrates the importance of connectivity between the Russian and Chinese populations for recovering tigers in Northeast China.

关键词： Amur tiger camera traps density individual identification spatial capture-recapture

来源：

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

A preliminary study on designing ecological corridors in Xishuangbanna National Nature Reserve with 3S techniques

引用

Frontiers in Biology 2008年第1期3卷 101-105页

作者： Liu LIN Li ZHANG limin feng Xianming GUO Jianwei ZHAO Jianhong DAO Key Laboratory of Biodiversity Science and Ecological Engineering Ministry of EducationSchool of Life SciencesBeijing Normal UniversityBeijing 100875China Xishuangbanna National Nature Reserve Bureaus Jinghong 666100China

This paper is based on the fieldwork in Xishuang-banna Natioanl Nature Reserve in Yunnan Province of China.GPS data of Asian elephants were collected and analyzed with the remote sensing satellite photos of the region to estimate the landform physiognomy of different colors.We also analyzed a series of ecological factors includ-ing altitude,landform,relief,villages and roads which affected the distribution and movement of Asian elephants.The results suggested the possibility of designing and estab-lishing corridors in Xishuangbanna National Nature Reserve to protect the population of wild elephants in the region.

关键词： Asian elephant 3S ecological corridor Xishuangbanna

来源：

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

New challenges facing traditional nature reserves: Asian elephant (Elephas maximus) conservation in China

引用

Integrative Zoology 2006年第4期1卷 179-187页

作者： Li ZHANG Lichao MA limin feng Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering Beijing Normal UniversityBeijingChina

Traditional conservation strategies can effectively preserve biodiversity within nature reserves,but may fail to mitigate the conflicts between rural development and wildlife conservation.This paper discusses the magnitude of the conflict and its development over time,focusing on elephant conservation and land resource management within and around nature reserves.We suggest that regulations alone can satisfy neither the demands to maintain biodiversity and ecosystem services nor the demands to achieve human welfare.More innovative tools such as informed landuse planning and integrated conservation development projects are called for to reduce the agricultural interface with elephant range,and therefore to alleviate the damage caused by the conflict.

关键词： Asian elephant human-elephant conflicts nature reserve management

来源：

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

带有反向正脉冲的HiPIMS技术制备ta-C膜及性能研究

引用

表面技术 2024年第13期53卷 96-103页

作者：何哲秋冯利民李建中石俊杰高宣雯东北大学多金属共生矿生态化冶金教育部重点实验室沈阳110819 东北大学冶金学院沈阳110819

目的提高切削刀具和耐磨零件的表面硬度和摩擦性能,延长工具的使用寿命。方法基于高功率脉冲磁控溅射技术(HiPIMS),在每个脉冲周期尾部施加反向正脉冲,控制ta-C沉积过程,通过电镜测试、拉曼测试、XPS测试、纳米压痕硬度测试、摩擦磨损... 详细信息

目的提高切削刀具和耐磨零件的表面硬度和摩擦性能,延长工具的使用寿命。方法基于高功率脉冲磁控溅射技术(HiPIMS),在每个脉冲周期尾部施加反向正脉冲,控制ta-C沉积过程,通过电镜测试、拉曼测试、XPS测试、纳米压痕硬度测试、摩擦磨损实验分别分析脉冲频率、反向正脉冲能量对ta-C薄膜沉积速度、膜结构、硬度、结合强度、耐磨性能的影响。结果采用钨钢为基体进行实验,将频率从4000 Hz到1500 Hz依次降低,制备涂层。在频率为4000 Hz的处理条件下制备涂层时,ta-C膜层的厚度为479.2 nm,通过XPS可知,此时sp^(3)的原子数分数达到59.53%,硬度为32.65 GPa,且得到的薄膜在12.7 N时失效,耐磨性较差,摩擦因数约为0.163。在频率为1500 Hz的处理条件下制备涂层时,涂层各项性能均有所提升,ta-C膜层的厚度为488.6 nm,通过XPS可知,此时sp^(3)的原子数分数达到63.74%,硬度为40.485 GPa,且薄膜在14.9 N时失效,耐磨性较优,摩擦因数约为0.138。结论通过调节脉冲频率,可以有效提高ta-C薄膜的沉积效率,改善膜的结构和性能。随着沉积ta-C薄膜频率的降低,薄膜中sp^(3)的含量呈现增大趋势,摩擦因数也随之降低,有效改善了ta-C膜的耐磨性。

关键词：高功率脉冲磁控溅射技术类金刚石膜脉冲频率结合力硬度耐磨性

来源：

维普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

SGLT2抑制剂对动脉粥样硬化神经保护作用机制研究进展

引用

河北医药 2024年第7期46卷 1080-1085页

作者：边晓红罗威冯利民天津中医药大学天津市300193 天津中医药大学第二附属医院

动脉粥样硬化是一种多发性的血管内膜病变,易累及冠状动脉和脑动脉,是冠心病、高血压、脑卒中等心脑血管疾病的主要病理基础。动脉粥样硬化与认知障碍的发生密切相关,而糖尿病和动脉粥样硬化二者又互为危险因素,故临床中糖尿病患者是动... 详细信息

动脉粥样硬化是一种多发性的血管内膜病变,易累及冠状动脉和脑动脉,是冠心病、高血压、脑卒中等心脑血管疾病的主要病理基础。动脉粥样硬化与认知障碍的发生密切相关,而糖尿病和动脉粥样硬化二者又互为危险因素,故临床中糖尿病患者是动脉粥样硬化和认知障碍的高危人群。钠-葡萄糖协同转运蛋白2抑制剂(SGLT2i)是近年来上市的新型降糖药物,多项研究表明其对动脉粥样硬化和神经具有保护作用。其保护作用机制是多途径的。包括降低促炎细胞因子,M2巨噬细胞极化,抑制STAT1和NLRP3炎症小体及减轻氧化应激反应。同时SGLT2i也能改善内皮功能,防止重构,对神经血管单位、血脑屏障、周细胞、少突胶质细胞等具有保护作用。据研究SGLT2i还可以显著提高脑源性神经营养因子(BDNF)水平以及恢复mTOR激活的昼夜节律,降低动脉粥样硬化的程度,且能调节神经传递,确保神经元的生长、生存和可塑性。本文就SGLT2i对动脉粥样硬化及神经的保护作用机制最新进展展开综述,以期为临床进一步治疗动脉粥样硬化、认知障碍等相关心脑血管疾病提供新的思路。

关键词： SGLT2抑制剂神经保护动脉粥样硬化保护机制

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：