检索结果-南通市图书馆

Nano Research 2022年第9期15卷 7896-7902页

作者： Yiqun Chen Guochang Li Yu Zeng Lijie Yan Xizhang Wang lijun yang Qiang Wu Zheng Hu Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Provincial Lab for Nanotechnology School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

The atomically dispersed Fe^(3+)sites of Fe-N-C single-site catalysts(SSCs)are demonstrated as the active sites for CO_(2)electroreduction(CO_(2)RR)to CO but suffer from the reduction to Fe^(2+)at~−0.5 V,accompanied by the drop of CO faradaic efficiency(FECO)and deterioration of partial current(JCO).Herein,we report the construction of F-doped Fe-N-C SSCs and the electron-withdrawing character of fluorine could stabilize Fe3+sites,which promotes the FECO from the volcano-like highest value(88.2%@−0.40 V)to the high plateau(>88.5%@−0.40-−0.60 V),with a much-increased JCO(from 3.24 to 11.23 mA·cm^(−2)).The enhancement is ascribed to the thermodynamically facilitated CO_(2)RR and suppressed competing hydrogen evolution reaction,as well as the kinetically increased electroactive surface area and improved charge transfer,due to the stabilized Fe^(3+)sites and enriched defects by fluorine *** finding provides an efficient strategy to enhance the CO_(2)RR performance of Fe-N-C SSCs by stabilizing Fe^(3+).

关键词： carbon dioxide electroreduction iron-nitrogen-carbon single-site catalysts fluorine-doping active site regulation

某三甲中医医院ICU感染发生率时间序列分析及趋势预测

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

西部中医药 2024年第9期37卷 78-82页

作者：杨丽萍程立军李潇杨雳畯丁淑玉王靖研黄文莉毛宝宏甘肃省中医院公共卫生与医院感染管理处甘肃中医药大学公共卫生学院甘肃省康泰医院甘肃省妇幼保健院/甘肃省中心医院医学教育部

目的：了解某三甲中医医院ICU感染发生率的时序分布特征，预测其发生规律和趋势，为中医医院ICU感染监测提供数据支持。方法：收集某三甲中医医院2019年1月至2024年2月ICU医院感染数据。利用求和自回归滑动平均模型（Autoregressive int... 详细信息

目的：了解某三甲中医医院ICU感染发生率的时序分布特征，预测其发生规律和趋势，为中医医院ICU感染监测提供数据支持。方法：收集某三甲中医医院2019年1月至2024年2月ICU医院感染数据。利用求和自回归滑动平均模型（Autoregressive integrated moving average,ARIMA）对ICU感染发生趋势进行预测并评价其预测效果。结果：2019年1月至2024年2月某三甲中医医院ICU医院感染发生率为2.61%(232/8895)；时间序列分析显示，ICU医院感染发生率波动较大且存在一定周期性，总体呈下降趋势。根据赤池信息准则和贝叶斯信息准则拟合，ARIMA(0,1,1)为最优预测模型。经参数估计与效果评价，感染发生率实际值均在预测值95%可信区间内，模型预测效果较好。结论：运用ARIMA对某三甲中医医院ICU医院感染发生率的预测结果良好，可显示其长期发生规律与趋势，能为医院感染监测提供科学依据。

关键词：医院感染重症监护病房求和自回归滑动平均模型时间序列趋势预测

同方期刊数据库

Hierarchical sulfur and nitrogen co-doped carbon nanocages as efficient bifunctional oxygen electrocatalysts for rechargeable Zn-air battery

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2019年第7期28卷 64-71页

作者： Hao Fan Yu Wang Fujie Gao Longqi yang Meng Liu Xiao Du Peng Wang lijun yang Qiang Wu Xizhang Wang Zheng Hu Key Laboratory of Mesoscopic Chemistry of MOE and Collaborative Innovation Center of Chemistry for Life Sciences Jiangsu Provincial Laboratory for NanotechnologySchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023.JiangsuChina National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210023JiangsuChina College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210023JiangsuChina

Exploring inexpensive and efficient bifunctional electrocatalysts for oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) is critical for rechargeable metal-air batteries. Herein, we report a new 3D hierarchical sulfur and nitrogen co-doped carbon nanocages(hSNCNC) as a promising bifunctional oxygen electrocatalyst by an in-situ MgO template method with pyridine and thiophene as the mixed precursor. The as-prepared h SNCNC exhibits a positive half-wave potential of 0.792 V(vs. reversible hydrogen electrode, RHE) for ORR, and a low operating potential of 1.640 V at a 10 mA cm-2 current density for OER. The reversible oxygen electrode index is 0.847 V, far superior to commercial Pt/C and IrO2,which reaches the top level of the reported bifunctional catalysts. Consequently, the hSNCNC as air cathodes in an assembled Zn-air battery features low charge/discharge overpotential and long lifetime. The remarkable properties arises from the introduced multiple heteroatom dopants and stable 3D hierarchical structure with multi-scale pores, which provides the abundant uniform high-active S and N species and efficient charge transfer as well as mass transportation. These results demonstrate the potential strategy in developing suitable carbon-based bi-/multi-functional catalysts to enable the next generation of the rechargeable metal-air batteries.

关键词： 3D hierarchical Carbon nanocages S,N co-doping Bifunctional electrocatalysis Zn-air battery

在线全文

学校读者我要写书评

暂无评论

唐山地区儿童毛发疾病流行病学特征分析

实用皮肤病学杂志 2024年第3期17卷 149-154页

作者：苏晨琳王春爽杨丽君刘春景河北省唐山市妇幼保健院皮肤科唐山063000

目的分析唐山地区儿童毛发疾病流行病学特点,为临床诊疗提供参考。方法收集2020年1月至2020年12月河北省唐山市妇幼保健院皮肤科确诊为毛发疾病的246例儿童的临床资料,统计分析毛发疾病病种构成及其临床特点。结果唐山地区儿童毛发... 详细信息

目的分析唐山地区儿童毛发疾病流行病学特点,为临床诊疗提供参考。方法收集2020年1月至2020年12月河北省唐山市妇幼保健院皮肤科确诊为毛发疾病的246例儿童的临床资料,统计分析毛发疾病病种构成及其临床特点。结果唐山地区儿童毛发疾病占皮肤科就诊儿童的1.12%。皮脂腺痣(7.72%)是最常见的先天性病因,斑秃(56.10%)、头癣(14.63%)和拔毛癖(8.94%)是最为常见的获得性病因。斑秃138例中,以多灶、轻症性脱发为主,且女性患儿居多(53.62%),少数病例有家族遗传史(3.62%),部分病例合并其他病症,如变应性疾病(17.39%)、注意缺陷与多动障碍(2.90%)和甲损害(2.90%)等,男女患儿各方面表现差异无统计学意义(P>0.05)。头癣36例中,男性患儿占多数(69.44%),白癣为最常见类型(75.00%),其中乡村患儿多于城区,多数患儿有宠物饲养史(特别是犬),真菌镜检和培养阳性率高。拔毛癖22例中,以头顶(59.09%)和颞部(22.73%)最为多见,且男性患儿居多(68.18%),男性患儿中单胎家庭发病率(73.33%)高于多胎家庭(26.67%),而女性患儿则相反(单胎家庭14.29%,多胎家庭85.71%)。结论唐山地区儿童毛发疾病以斑秃、头癣、拔毛癖、皮脂腺痣多见,且呈现地域性特征。

关键词：儿童毛发问题流行病学特征

Precious Fossil-Bearing Beds of the Lower Cretaceous Jiufotang Formation in Western Liaoning Province, China

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2007年第3期81卷 357-364页

作者： ZHANG lijun yang Yajun ZHANG Lidong GUO Shengzhe WANG Wuli ZHENG Shaolin Shenyang Institute of Geology and Mineral Resources Ministry of Land and Resources Shenyang Liaoning 110032

Based on the subdivision into three members of the Lower Cretaceous Jiufotang Formation in western Liaoning, this paper deals mainly with the division and correlation of precious fossil birdand reptile-bearing beds of the formation in the Dachengzi, Chaoyang, *** and Fuxin-Yixian basins. Among them, the precious fossil-bearing beds in the Dachengzi Basin may be recognized as the Xidagou Bed of the second member and the yangcaogoudonggou Bed of the third member; those in the Chaoyang Basin may be confirmed as the Shangheshou Bed of the second member and the Dongpochi Bed of the third member; those in the Dapingfang-Meileyingzi Basin are as the Lamagou Bed of the second member, the Huanghuagou Bed of the lower third member and the Yuanjiawa Bed of the upper third member; and those in the Fuxin-Yixian Basin are listed as the Tuanshanzi Bed of the second member and the Pijiagou Bed of the third member. Since these basins are distinctly separated and the bird and reptile fossils are mostly new genera and species, we have to use the associated fossil ostracod assemblages as index to correlate the Xidagou Bed with the Shangheshou Bed and the Lamagou Bed, and to correlate the Yuanjiawa Bed with the yangcaogoudonggou Bed and the Pijiagou Bed. Primarily, we established the sequence of the precious fossil-bearing beds of the Jiufotang Formation in western Liaoning. They are represented by, in ascending order, the Xidagou Bed of the second member, the Huanghuagou Bed of the lower third member, and the Yuanjiawa Bed of the upper third member. Obviously, this work has significance for the study on the time-space distribution and radiation of birds and dinosaurs during the period of the middle Early Cretaceous.

关键词： division correlation precious fossil-bearing beds Lower Cretaceous JiufotangFormation western Liaoning

Nitrogen and atomic Fe dual-doped porous carbon nanocubes as superior electrocatalysts for acidic H2-O_(2) PEMFC and alkaline Zn-air battery

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第8期30卷 388-395,I0008页

作者： Xiudong Shi Zonghua Pu Bin Chi Mingrui Liu Siyan Yu Long Zheng lijun yang Ting Shu Shijun Liao The Key Laboratory of Fuel Cell Technology of Guangdong Province&the Key Laboratory of New Energy Technology of Guangdong Universities School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510641China Ballard Power Systems 9000 Glenlyon ParkwayBurnaby V5J 5J8Canada

Air cathodes with high electrocatalytic activity are vital for developing H2/O_(2) proton exchange membrane fuel cells(PEMFC)and Zn-air ***,the state-of-the-art air cathodes suffer from either limited catalytic activity or high cost,which thus hinder their ***,we designed ZIF-8 derived nitrogen and atomic iron dual-doped porous carbon nanocubes as high-quality catalysts for ORR,through a novel gas-doping *** porous carbon nanocubic architecture and abundant Fe-Nxactive species endow ZIF-8 derived single atomic iron catalyst(PCN-A@Fe SA)with superior catalytic activity,and surpass Pt/C and a majority of the reported *** XAS and DFT calculations suggest that Fe2+N4 moieties are the main active centers that are favorable for oxygen affinity and OH*intermediate desorption,which can result in promising catalytic *** importantly,PCNA@Fe SA can achieve power density of 514 m W cm^(-2) as cathodic catalyst in a PEMFC and discharge peak power density of 185 m W cm^(-2) in an alkaline Zn-air *** outstanding performance is derived from both the high specific surface area and high-density of iron single atom in nitrogen doped nanocubic carbon matrix.

关键词： Gaseous doping Fe-Nx sites Fe single atoms Oxygen reduction reaction Electrocatalysts

Oligodendrocyte transcription factor 1 mRNA and protein expression in organotypic rat brain slices

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2010年第21期5卷 1639-1643页

作者： Hong Cui lijun yang Dezhuang Huang Wandong Zhang Weijuan Han Yanqing Yao Wenxing Jiang Pediatrics Department Beijing Friendship Hospital Capital Medical University Beijing 100050 China Hepatitis Institute Beijing YouAn Hospital Capital Medical University Beijing 100054 China Institute for Biological Sciences National Research Council of Canada Ottawa K1A OR6 Ontario Canada

Numerous studies have confirmed that oligodendrocyte transcription factor 1 （Olig-1） is vital for myelin repair. However, the effects of hypoxia and ischemia on Olig-1 expression remain unknown. In this study, Olig-1 mRNA and protein expressions were analyzed by in situ hybridization and immunohistochemistry, to determine the expression profile of Olig-1 in rat brain slices exposed to hypoxia and ischemia. Brains were obtained from 2-day-old Sprague-Dawley rats, and sections were randomly assigned to control and hypoxia/ischemia groups. Hematoxylin-eosin staining revealed karyorrhexis and karyopyknosis in cells from the hypoxia/ischemia group. Under electron microscopy, mitochondria swelling and neuropil edema were observed in the hypoxiaJischemia group. Olig-1 mRNA and protein expressions were increased at 1 day after hypoxia and ischemia treatment. These results suggest that in situ hybridization and immunohistochemistry could be used simultaneously to detect mRNA and protein expression in brain slices.

关键词： oligodendrocyte transcription factor 1 double staining brain slices immunohistochemistry in situ hybridization hypoxia and ischemia

在线全文

学校读者我要写书评

暂无评论

寄生虫大体标本制作技术的改良

热带医学杂志 2024年第1期24卷 139-141页

作者：陈熙王卫群吴嘉马佳杨立军昆明医科大学基础医学院病原生物学与免疫学系云南昆明650500 昆明医科大学基础医学院实验教学中心云南昆明650500

目的探索对传统寄生虫大体标本制作技术的改进,丰富教学标本的种类。方法环氧树脂AB(水晶滴胶)包埋寄生虫标本,固化、脱模后制成水晶滴胶寄生虫大体标本,制作过程不使用标本缸和保存液。结果技术改良后制成的水晶滴胶标本透明度高、结... 详细信息

目的探索对传统寄生虫大体标本制作技术的改进,丰富教学标本的种类。方法环氧树脂AB(水晶滴胶)包埋寄生虫标本,固化、脱模后制成水晶滴胶寄生虫大体标本,制作过程不使用标本缸和保存液。结果技术改良后制成的水晶滴胶标本透明度高、结构清晰、轻便、易观察、可永久保存。结论寄生虫水晶滴胶标本保存效果好,克服了传统大体标本制作存在的一些不足,可适应当前高循环的实验室教学需求。

关键词：水晶滴胶寄生虫标本制作改良

308 nm准分子光结合他克莫司治疗儿童白癜风临床效果及安全性观察

在线全文

学校读者我要写书评

暂无评论

中华生物医学工程杂志 2024年第2期30卷 119-123页

作者：王春爽苏晨琳刘春景杨丽君唐山市妇幼保健院皮肤科唐山

目的探究准分子光(308 nm)结合他克莫司在儿童白癜风治疗方面的效果及安全性。方法挑选2017年1月至2020年12月这一段时间收治的白癜风患儿100例为此次试验对象, 随机双盲将其分成2组, 给予对照组50例患儿实施他克莫司外用治疗, 研究组5... 详细信息

目的探究准分子光(308 nm)结合他克莫司在儿童白癜风治疗方面的效果及安全性。方法挑选2017年1月至2020年12月这一段时间收治的白癜风患儿100例为此次试验对象, 随机双盲将其分成2组, 给予对照组50例患儿实施他克莫司外用治疗, 研究组50例患儿另外加用准分子光(308 nm)治疗, 观察各组儿童数据包括临床疗效、面颈、躯干与四肢皮损复色时间、皮肤色素方面的评分以及白癜风具体的面积评分指数(VASI)改变情况、皮肤病生活质量量表(DLQI)评分改变情况、治疗的不良反应, 观察随访1年期间患儿疾病的具体复发情况。结果治疗总有效率方面, 研究组患儿(94.00%)较对照组(78.00%)高(P0.05);各组儿童治疗后上述各个指标全部出现了改善, 且研究组患儿这些指标优于对照组(均P0.05;研究组儿童1年复发率(8.51%)低于对照组儿童(27.65%), P<0.05。结论 308 nm准分子光结合他克莫司治疗儿童白癜风临床效果显著, 可较好改善儿童症状, 促进患儿更快恢复, 患儿生活质量一定程度提升, 且不良反应较少, 治疗较为安全可靠, 还可一定程度降低患儿疾病复发率。

关键词：儿童白癜风 308 nm准分子光他克莫司临床疗效皮损复色时间不良反应复发率

Development of Chrysomya megacephala at constant temperatures within its colony range in yangtze River Delta region of China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Forensic Sciences Research 2018年第1期3卷 74-82页

作者： Yingna Zhang Yu Wang lijun yang Luyang Tao Jiangfeng Wang Department of Forensic Medicine Soochow UniversitySuzhouChina

Chrysomya megacephala (Fabricius,1794) is the most abundant and predominant species which arrives and colonizes a cadaver first in most parts of ***,its growth and development patterns have great implications in the estimation of the minimum postmortem interval (PMImin).In this study,C megacephala was collected from the yangtze River Delta region and reared at seven constant temperatures ranging from 16 ℃ to 34 ℃.The developmental duration and accumulated degree hours,larval body length and morphological changes of *** were ***,we constructed three developmental models,isomorphen diagram,isomegalen diagram and thermal summation model,which can be used for estimating *** developmental durations of *** at 16 ℃,19 ℃,22 ℃,25 ℃,28 ℃,31 ℃ and 34 ℃ are (794.8 ± 14.7),(533.2 ± 10.1),(377.8 ± 16.8),(280.8 ± 15.1),(218.9 ± 8.5),(190.8 ± 10.1) and (171.8 ± 6.8) h,*** developmental threshold temperature D0 is (11.41 ± 0.32) ℃,and the thermal summation constant K is (3 418.7 ± 137.0) degree *** analysis was conducted to obtain equations of the variation in larval body length with time after hatching,and variation in time after hatching with body ***,our study divides the intra-puparial morphological changes of *** into 11 sub-stages,and provides the time range experienced by each *** results of this study provide fundamental development data for the use of *** in PMImin estimations.

关键词： Forensic science forensic entomology oriental latrine fly development time isomorphen/isomegalen diagram thermal summation model intra-puparial development