检索结果-南通市图书馆

WHMA-1000型水质多参数重金属在线监测仪的性能评估

在线全文

学校读者我要写书评

暂无评论

分析仪器 2021年第6期 65-72页

作者：方哲王雷王超刚朱丽娟李瑞超唐林鑫刘海艺胡少成钢研纳克检测技术股份有限公司北京100094

介绍了WHMA-1000型多参数重金属在线监测仪的模块组成和原理,并进行了条件优化实验,做出了性能参数的评估数据。结果如下:以Cr、Pb、As为测试元素,精密度均小于3%;进样时间10min,以二次水为空白,检出限分别为0.0027mg/L、0.0024mg/L、0.... 详细信息

介绍了WHMA-1000型多参数重金属在线监测仪的模块组成和原理,并进行了条件优化实验,做出了性能参数的评估数据。结果如下:以Cr、Pb、As为测试元素,精密度均小于3%;进样时间10min,以二次水为空白,检出限分别为0.0027mg/L、0.0024mg/L、0.0033mg/L;零点漂移均小于2%,量程漂移在5%左右;线性相关系数R^(2)均大于0.99;记忆效应在20%和80%量程浓度值下均小于5%。该仪器可以实现连续的多元素同测,且无干扰,无二次污染,稳定性高,现场适用强。

关键词： X射线荧光光谱法水质多参数重金属

在线全文

学校读者我要写书评

暂无评论

母语为汉语患者应用多道人工耳蜗的言语识别

听力学及言语疾病杂志 1999年第4期7卷 169-172页

作者：魏朝刚曹克利王直中曾凡钢中国协和医科大学北京协和医院耳鼻咽喉科 100730 江西省九江市妇幼保健院美国马里兰大学听力和言语科学系

目的　对母语为汉语的多通道人工耳蜗使用者进行言语评估及结果分析。方法　５例语后聋成人中，应用ＭＡＣＣ（汉语最低听觉功能）测试材料，分别进行了包括封闭项列（机会水平０．２５）和开放项列两大部分的言语识别测试。结果... 详细信息

目的　对母语为汉语的多通道人工耳蜗使用者进行言语评估及结果分析。方法　５例语后聋成人中，应用ＭＡＣＣ（汉语最低听觉功能）测试材料，分别进行了包括封闭项列（机会水平０．２５）和开放项列两大部分的言语识别测试。结果　韵母平均正确识别率５７．７１％（２５．６９％～８８．１９％）；声母７２．０４％（４６．２３％～９０．４８％）；数词８３．２６％（４８．００％～１００．０％）；声调６１．６８％（４６．４０％～７１．４０％）；单字词３８．２７％（１．７１％～７９．５５％）；双字词４４．１２％（０．００％～９５．９４％）；短句中关键字识别率４７．８８％（０．５３％～９７．３４％）；噪声中短句识别全部患者均为０％；环境声识别率５０．５２％（７．１４％～８０．９５％）。全部患者封闭项列的正确识别率均大于机会水平，而开放项列识别表现不一。结论　国人应用多导人工耳蜗装置后能获得较好的听觉能力和语言交流能力。

关键词：普通话汉族人工耳蜗言语识别率多道人工耳蜗

Optimizing the key parameter to accelerate the recovery of AMOC under a rapid increase of greenhouse gas forcing

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2025年第1期18卷 39-45页

作者： Haolan Ren Fei Zheng Tingwei Cao Qiang wang International Center for Climate and Environment Science(ICCES) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina College of Oceanography Hohai UniversityNanjingChina CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences and Pilot National Laboratory for Marine Science and Technology(Qingdao)QingdaoChina

Atlantic Meridional Overturning Circulation(AMOC)plays a central role in long-term climate variations through its heat and freshwater transports,which can collapse under a rapid increase of greenhouse gas forcing in climate *** studies have suggested that the deviation of model parameters is one of the major factors in inducing inaccurate AMOC *** this work,with a low-resolution earth system model,the authors try to explore whether a reasonable adjustment of the key model parameter can help to re-establish the AMOC after its *** a new optimization strategy,the extra freshwater flux(FWF)parameter is determined to be the dominant one affecting the AMOC’s *** traditional ensemble optimal interpolation(EnOI)data assimilation and new machine learning methods are adopted to optimize the FWF parameter in an abrupt 4×CO_(2) forcing experiment to improve the adaptability of model parameters and accelerate the recovery of *** results show that,under an abrupt 4×CO_(2) forcing in millennial simulations,the AMOC will first collapse and then re-establish by the default FWF parameter ***,during the parameter adjustment process,the saltier and colder sea water over the North Atlantic region are the dominant factors in usefully improving the adaptability of the FWF parameter and accelerating the recovery of AMOC,according to their physical relationship with FWF on the interdecadal timescale.

关键词： Recovery of AMOC 4×CO_(2)forcing Key parameter Parameter estimation Data assimilation Machine learning

Regulating local coordination environment of Mg-Co single atom catalyst for improved direct methanol fuel cell cathode

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2023年第6期11卷 1959-1969页

作者： Kaiwen wang Hanjun Zou Jiazhi Meng chaogang Ban Xue Liu Jiangping Ma Cong wang Liyong Gan Xiaodong Han Xiaoyuan Zhou College of Physics and Center of Quantum Materials and Devices Chongqing UniversityChongqing 401331China Beijing Key Laboratory of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100024China Institute of Emerging Energy Storage Materials and Equipment Chongqing 401135China Analytical and Testing Center Chongqing UniversityChongqing 401331China

Fuel cells operated with a reformate fuel such as methanol are promising power systems for portable electronic devices due to their high safety,high energy density and low pollutant ***,several critical issues including methanol crossover effect,CO-tolerance electrode and efficient oxygen reduction electrocatalyst with low or non-platinum usage have to be addressed before the direct methanol fuel cells(DMFCs)become commercially available for industrial ***,we report a highly active and selective Mg-Co dualsite oxygen reduction reaction(ORR)single atom catalyst(SAC)with porous N-doped carbon as the *** catalyst exhibits a commercial Pt/C-comparable half-wave potential of 0.806 V(versus the reversible hydrogen electrode)in acid media with good ***,practical DMFCs test achieves a peak power density of over 200 m W cm^(-2)that far exceeds that of commercial Pt/C counterpart(82 m W cm^(-2)).Particularly,the Mg-Co DMFC system runs over 10 h with negligible current loss under 10 M concentration methanol work *** results and theoretical calculations reveal that the N atom coordinated by Mg and Co atom exhibits an unconventional d-band-ditto localized p-band and can promote the dissociation of the key intermediate*OOH into*O and*OH,which accounts for the near unity selective 4e-ORR reaction pathway and enhanced ORR *** contrast,the N atom in SAC–Co remains inert in the absorption and desorption of*OOH and**** local coordination environment regulation strategy around active sites may promote rational design of high-performance and durable fuel cell cathode electrocatalysts.

关键词： Single atom catalyst Mg−N−Co DMFC Cathode

在线全文

学校读者我要写书评

暂无评论

贵阳地区低产梨园改造技术与成效

贵州农业科学 2007年第5期35卷 127-127,129页

作者：王朝刚罗发庆倪家军李琼英白启秀贵阳乌当区新场乡农业服务中心贵州贵阳550011

梨是贵阳地区种植的主要水果之一，也是城市近郊果农的主要经济收入来源。但大部分梨园为20世纪80年代初所建，树龄较长，品种单一、老化和管理粗放，导致单产较低，效益不高，基本上失去了市场竞争能力。为了适应农业产业结构调整，促... 详细信息

梨是贵阳地区种植的主要水果之一，也是城市近郊果农的主要经济收入来源。但大部分梨园为20世纪80年代初所建，树龄较长，品种单一、老化和管理粗放，导致单产较低，效益不高，基本上失去了市场竞争能力。为了适应农业产业结构调整，促进新农村建设和可持续发展，推进观光农业、旅游产业与民族风情资源的优化结合，笔者等对贵阳地区梨园的基本情况进行了普查，

关键词：梨园改造技术

Design of a cationic accelerator enabling ultrafast ion diffusion kinetics in aqueous zinc-ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 377-384页

作者： Yawei Xiao Qianqian Gu Haoyu Li Mengyao Li Yude wang National Center for International Research on Photoelectric and Energy Materials School of Materials and Energy Yunnan University Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources School of Chemistry and Chemical Engineering Hainan University College of Chemical Engineering Fuzhou University Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies Yunnan University

Aqueous zinc-ion batteries are highly favored for grid-level energy storage owing to their low cost and high safety,but their practical application is limited by slow ion *** address this,a strategy has been developed to create a cation-accelerating electric field on the surface of the cathode to achieve ultrafast Zn2+diffusion *** employing electrodeposition to coat MoS2on the surface of BaV6O16·3H2O nanowires,the directional built-in electric field generated at the heterointerface acts as a cation accelerator,continuously accelerating Zn2+diffusion into the active *** optimized Zn2+diffusion coefficient in CC@BaV-6O16·3H2O@MoS2(7.5×10～8cm2s-1) surpasses that of most reported V-based ***,MoS2serving as a cathodic armor extends the cycling life of the Zn-CC@BaV6O16·3H2O@MoS2full batteries to over 10000 *** work provides valuable insights into optimizing ion diffusion kinetics for high-performance energy storage devices.

关键词： Internal electric field Cationic accelerator Ion diffusion kinetics Cathode modification strategy Aqueous zinc ion battery

StAR基因高表达对DEHP致MCF-7细胞凋亡作用的影响

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

癌变．畸变．突变 2018年第2期30卷 126-131页

作者：彭鹏王潮岗徐新云夏俊杰黄海燕王利黄奕钦杨晨深圳市疾病预防控制中心毒理研究所广东深圳518055 深圳大学生命与海洋科学学院广东深圳518060 南华大学公共卫生学院湖南衡阳421001

目的:构建类固醇合成急性调节蛋白(St AR)基因高表达载体,建立St AR基因高表达细胞,研究St AR基因高表达对邻苯二甲酸二-(2-乙基己)酯(DEHP)毒性作用的影响。方法:根据Gen Bank提供的St AR基因c DNA序列设计引物,PCR扩增St AR基因并将... 详细信息

目的:构建类固醇合成急性调节蛋白(St AR)基因高表达载体,建立St AR基因高表达细胞,研究St AR基因高表达对邻苯二甲酸二-(2-乙基己)酯(DEHP)毒性作用的影响。方法:根据Gen Bank提供的St AR基因c DNA序列设计引物,PCR扩增St AR基因并将其克隆到慢病毒载体中,构建St AR基因高表达MCF-7细胞,通过基因测序、荧光定量PCR和Western blot鉴定细胞。用不同剂量DEHP染毒MCF-7细胞和St AR基因高表达MCF-7细胞24 h,检测细胞凋亡相关基因Bax、Caspase-3、Caspase-8在m RNA和蛋白表达水平的变化。结果:基因测序证明构建的St AR基因高表达载体序列正确,荧光定量PCR检测St AR基因转染细胞比正常MCF-7细胞St AR m RNA表达水平升高591.9倍(P<0.01),Western blot实验结果显示,St AR基因转染细胞比正常MCF-7细胞St AR蛋白表达水平升高190%(P<0.01)。不同剂量DEHP染毒St AR基因高表达细胞后,荧光定量PCR结果显示,St AR基因高表达细胞中Bax、Caspase-3和Caspase-8 m RNA表达水平较对照组(0 mmol/L DEHP)显著升高,差异均有统计学意义(P<0.05或P<0.01)。Western blot实验显示,St AR基因高表达细胞中Bax、Caspase-3和Caspase-8蛋白表达水平比对照组显著升高,差异均有统计学意义(P<0.05或P<0.01)。结论:本实验成功构建了St AR基因高表达细胞,DEHP处理后St AR基因高表达细胞的凋亡相关基因表达水平较MCF-7细胞升高,提示St AR基因具有促进DEHP致细胞凋亡作用。

关键词：邻苯二甲酸二-(2-乙基己)酯类固醇合成急性调节蛋白基因高表达凋亡基因

缺血性脑血管病患者支架置入术后再狭窄危险因素分析及预测模型的构建

在线全文

学校读者我要写书评

暂无评论

河南医学研究 2023年第12期32卷 2164-2168页

作者：王朝刚张晓曼李兆妍徐远杰范建江郑州市第一人民医院神经内科河南郑州450004

目的分析缺血性脑血管病患者支架置入术后再狭窄危险因素,并进行预测模型的构建。方法选取郑州市第一人民医院2019年3月至2021年8月156例行支架置入术的缺血性脑血管病患者,依据术后是否再狭窄,分为狭窄组与非狭窄组,比较两组临床资料,... 详细信息

目的分析缺血性脑血管病患者支架置入术后再狭窄危险因素,并进行预测模型的构建。方法选取郑州市第一人民医院2019年3月至2021年8月156例行支架置入术的缺血性脑血管病患者,依据术后是否再狭窄,分为狭窄组与非狭窄组,比较两组临床资料,应用logistic回归分析再狭窄危险因素,构建预测模型,并以受试者工作特征(ROC)曲线分析模型应用价值。结果随访发现,1 a内再狭窄共34例(21.79%);狭窄组与非狭窄组糖尿病、吸烟史、支架类型、支架长度、随访时胱抑素C(CysC)、D-二聚体(D-D)、高半胱氨酸(Hcy)、高密度脂蛋白(HDL)、规范进行抗血小板治疗情况比较差异有统计学意义(P15 mm、未规范进行抗血小板治疗、高CysC、高D-D、高Hcy与低HDL水平为术后再狭窄的危险因素(P15 mm、未规范进行抗血小板治疗、高CysC、高D-D、高Hcy与低HDL水平等,根据这些危险因素构建的预测模型,具有较高的预测效能。

关键词：缺血性脑血管病支架置入手术再狭窄危险因素预测模型

Photoinduced radical sulfur dioxide insertion with asymmetric cyclization of alkenes: accessing β-chiral sulfones bearing S-stereocentric cyclic sulfinamides

同方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

Science China Chemistry 2025年第01期 257-263页

作者： Jiapian Huang Chenxin wang Xu wang Xiaoyu Zhou Wei Xiao Jie Wu School of Pharmaceutical and Chemical Engineering & Institute for Advanced Studies Taizhou University State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences School of Chemistry and Chemical Engineering Henan Normal University

The generation of various β-chiral sulfones bearing chiral cyclic sulfinamides through photoredox-catalyzed sulfur dioxide insertion with asymmetric radical cyclization is described. This method features a broad substrate scope and excellent stereospecificity. Computational studies reveal that the dispersion interaction between sulfinyl group and CH2SO2Ph group plays a crucial role in the stereoselectivity control.

关键词：

同方期刊数据库