检索结果-南通市图书馆

Chinese Chemical Letters 2020年第8期31卷 2145-2149页

作者： Jin Peng Jie Liao xiaozhan yang Wenlin Feng Department of Physics and Energy Chongqing University of TechnologyChongqing 400054China Chongqing Key Laboratory of Green Energy Materials Technology and Systems Chongqing 400054China

An optical fiber dual Fabry-Perot interferometric carbon monoxide gas sensor based on PANI/Co3 O4/GO(PCG)sensing membrane coated on the end face of the optical fiber is proposed and *** end face of photonic crystal fiber(PCF)without cut-off wavelength is fused with a single-mode fiber(SMF),and the other end face of the PCF is coated with PCG sensing *** collapsed layer formed during the air hole fusion of PCF is used as the first reflector,the interface between PCF and sensing membrane is used as the second reflector,and the interface between the sensing membrane and the air is used as the third reflector,thus the dual Fabry-Pe rot structure sensor is *** results show that the sensor has excellent sensitivity and selectivity to carbon *** the increasing concentration of carbon monoxide gas in the range of 0-60 ppm,the intensity of interference spectrum *** sensitivity of the sensor is 0.3473 dB m/ppm,and its linearity is *** response time and recovery time are 68 s and 106 s,*** sensor has the advantages of the compact size,low cost,high sensitivity,strong selectivity and simple *** is suitable for the sensing detection of low concentration carbon monoxide gas.

关键词： Carbon monoxide Dual Fabry-Perot interferometer Gas sensor PANI/Co3O4/GO Sensing membrane

Fabrication of 2D ZnO Nanosheet Thin Film by a Simple Two-Step Approach

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第A3期35卷 642-643页

作者： Ning Wang Hong Lin Jianbao Li xiaozhan yang Jun yang Chunfu Lin State Key Lab of New Ceramics ＆ Fine Processing Department of Materials Science ＆ Engineering Tsinghua University Beijing 100084 China

In this paper,2D single-crystalline ZnO nanosheets thin film was fabricated successfully on silicon wafer by a simple two-step ***,SEM and TEM were used to characterize the phase structures and morphologies of ZnO nan... 详细信息

关键词： ZnO nanosheets crystal growth thin film

Facile Synthesis of Long,Straight and Uniform Copper Nanowires via a Solvothermal Method

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第A3期35卷 644-645页

作者： Chunfu Lin Hong Lin Ning Wang Xing Zhang Jun yang Jianbo Li xiaozhan yang State Key Lab of New Ceramics ＆ Fine Processing Department of Materials Science ＆ Engineering Tsinghua University Beijing 100084 China

Copper nanowires were facilely prepared via a solvothermal *** this method,cetyitrimethylammonium bromide (CTAB) was used as a soft template,copper nitrate was an inorganic precursor,and absolute ethanol served as a reducing agent as well as a solvent.X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the as-prepared copper *** as-prepared copper nanowires are fairly uniform and *** majority of them are longer than 100μm and some even longer than 200μ***,most nanowires are quite *** addition, The mechanism of the growth process of copper nanowires was discussed.

关键词： copper nanowires solvothermal method template

Synthesis and Characterization of Radiate MgO Whiskers

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第A3期35卷 648-649页

作者： Yanli Gong Jianbao Li Hong Lin xiaozhan yang Xuguang Tong Xiangdong Huang State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 China Department of Materials Science and Engineering Fuzhou University Fuzhou 350002 China

In this paper,radiate MgO whiskers were fabricated in the system of Mg-B-NaCl-Ar at relatively low temperature. The Mg vapor reacted with trace O_2 contained in the reaction system and formed MgO *** appropriate conditions,the MgO vapor could reach supersaturation and grow into highly radiate *** were characterized by means of field emission scanning electronic microscopy (FE-SEM),transmission electronic microscopy (TEM) and energy dispersive spectrometer (EDS).The mechanism of the morphologies of MgO was discussed.

关键词： MgO whiskers Synthesis

Fabrication of Porous Nanocrystalline NiCo_2O_4 Electrode for Water Electrolysis

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

稀有金属材料与工程 2006年第A3期35卷 646-647页

作者： Jun yang xiaozhan yang Jianbao Li Hong Lin Ning Wang Chunfu Lin Gangfeng Guo State Key Lab of New Ceramics ＆ Fine Processing Department of Materials Science ＆ Engineering Tsinghua University Beijing 100084 China

A porous nanocrystalline NiCo_2O_4 compound electrode was *** morphology of the electrode was controlled by altering the concentration of precipitant (NaOH solution).The electrode was consisted of metal substrate (Ni) and porous nanocrystalline NiCo_2O_4 film which was stacked by homosized and pretty regular hexagonal nanoparticles,with thinner than 50 nm and about 200 nm in *** electrode exhibits good electrochemical properties compared with Ni electrode.

关键词： electrophoretic deposition nanocrystalline NiCo2O4 porous water electrolysis

Dietary intake and serum levels of copper and zinc and risk of hepatocellular carcinoma:A matched case-control study

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2024年第5期137卷 596-603页

作者： xiaozhan Liu Yaojun Zhang Dinuerguli Yishake Yan Luo Zhaoyan Liu Yuming Chen Huilian Zhu Aiping Fang Guangdong Provincial Key Laboratory of Food Nutrition and HealthSchool of Public HealthSun Yat-sen UniversityGuangzhouGuangdong 510080China State Key Laboratory of Oncology in South China Sun Yat-sen University Cancer CenterGuangzhouGuangdong 510060China

Background:Copper and zinc are involved in the development of multiple malignancies;yet,epidemiological evidence on hepatocellular carcinoma(HCC)is *** study aimed to investigate the association between dietary intake and serum levels of copper and zinc with the risk of ***:A total of 434 case-control pairs matched for sex and age(±1 year)were included in this *** with newly diagnosed HCC were from the Guangdong Liver Cancer Cohort(GLCC)study,and healthy controls were from the Guangzhou Nutrition and Health Study(GNHS).A semi-quantitative 79-item food frequency questionnaire(FFQ)was used to assess habitual dietary intakes of copper and *** levels of copper and zinc were measured by using inductively coupled plasma mass *** copper(Cu)/zinc(Zn)ratio was computed by dividing copper levels by zinc *** logistic regression models were performed to calculate the odds ratio(OR)and 95%confidence intervals(CI)for per 1 standard deviation increase(per-SD increase)in copper and zinc ***:Higher dietary intake(OR_(per-SD increase)=0.65,95%CI:0.44,0.96,P_(trend)=0.029)and serum levels of zinc(OR_(per-SD increase)=0.11,95%CI:0.04,0.30,P_(trend)<0.001)were both associated with a lower risk of *** analyses showed that the inverse association was only pronounced in men but not in women(P_(interaction)=0.041 for dietary zinc intake and 0.010 for serum zinc levels).Serum copper levels(OR_(per-SD increase)=2.05,95%CI:1.39,3.03,P_(trend)=0.020)and serum Cu/Zn ratio(OR_(per-SD increase)=6.53,95%CI:2.52,16.92,P_(trend)<0.001)were positively associated with HCC risk,while dietary copper intake and dietary Cu/Zn ratio were not associated with HCC ***:Zinc may be a protective factor for HCC,especially among men,but the effects of copper on HCC risk are not clear.

关键词： Copper Zinc Hepatocellular carcinoma risk Case-control studies Dietary intake Serum

在线全文

学校读者我要写书评

暂无评论

Co-TCPP包覆薄芯光纤的CO传感器

激光与光电子学进展 2023年第1期60卷 364-369页

作者：王恋陈雨豪石静杨晓占广州特种承压设备检测研究院广东广州510663 重庆理工大学理学院重庆400054 绿色能源材料技术与系统重庆市重点实验室重庆400054

提出了一种基于Co-四(4-羧苯基卟吩)(Co-TCPP)金属有机框架的马赫-曾德尔结构CO传感器。该传感结构在两段薄芯光纤以及薄芯光纤与单模光纤之间熔接粗锥,将Co-TCPP涂覆在薄芯光纤表面。Co-TCPP的纳米片状形貌和多孔微结构,使该传感器不... 详细信息

提出了一种基于Co-四(4-羧苯基卟吩)(Co-TCPP)金属有机框架的马赫-曾德尔结构CO传感器。该传感结构在两段薄芯光纤以及薄芯光纤与单模光纤之间熔接粗锥,将Co-TCPP涂覆在薄芯光纤表面。Co-TCPP的纳米片状形貌和多孔微结构,使该传感器不仅易于与光纤粘附,还对CO有较强的吸附能力。通过X射线衍射、扫描电子显微镜、红外光谱、热重分析等表征分析敏感材料Co-TCPP的结构、形貌和性质。结果表明,该传感器对CO质量分数的灵敏度为0.0497 dB/10^(-6),对质量分数-光强的拟合度高达0.99148,CO质量分数为40×10^(-6)时的响应时间约为120 s,且对CO具有良好的选择性和时间稳定性。

关键词：传感器气体检测 Co-四(4-羧苯基卟吩)(Co-TCPP)

Cathodic micro-arc electro-deposition of ZrO_2 coatings in an aqueous solution containing colloidal particles

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2002年第3期21卷 198-202页

作者： yangxiaozhan GAOWei 等 BeijingKeyLaporatoryforCorrosion ErosionandSurfaceTechnologyUniversityofScienceandTechnologyBeijingBeijing100083China SchoolofEngineering TheUniversityofAucklandNewZealand

By a novel technique-cathodic micro-arc electro-deposition (CMED), ZrO_2coatings were deposited on an FeCrAl alloy. Experimental results show that the necessary conditionsfor obtaining ZrO_2 coatings are to apply a pulse peak voltage over a critical value and addmoderate amounts of ZrO_2 colloidal particles and Zr(NO_3)_4 in the aqueous solution. Theas-deposited coatings are porous because hydrogen, water, and other vapors are generated andreleased from the coatings to the solution during the spark reaction. The coatings containmonoclinic and tetragonal crystalline ZrO_2 with certain degree of amorphous structure. Theprocessing parameters and mechanism of CMED were discussed.

关键词： cathodic micro-arc electro-deposition ZrO_2 coating FeCrAl alloy

基于离子印迹复合膜的马赫-曾德尔干涉光纤传感器及其对Cu^(2+)的检测应用

在线全文

学校读者我要写书评

暂无评论

光学学报 2021年第24期41卷 44-53页

作者：杨晓占陈红亮冯文林重庆理工大学理学院物理与能源系重庆400054 绿色能源材料技术与系统重庆市重点实验室重庆400054

提出一种基于离子印迹复合膜马赫-曾德尔干涉仪结构的Cu^(2+)传感器。两段三芯光纤中间熔接一段单模光纤,在两段三芯光纤两端再分别耦合单模光纤,构成三芯-单模-三芯的传感结构。将壳聚糖(CS)和聚乙烯醇(PVA)组成的CS/PVA复合膜、Cu^(2+... 详细信息

提出一种基于离子印迹复合膜马赫-曾德尔干涉仪结构的Cu^(2+)传感器。两段三芯光纤中间熔接一段单模光纤,在两段三芯光纤两端再分别耦合单模光纤,构成三芯-单模-三芯的传感结构。将壳聚糖(CS)和聚乙烯醇(PVA)组成的CS/PVA复合膜、Cu^(2+)印迹复合膜和优化Cu^(2+)印迹复合膜分别涂覆在三芯光纤表面,利用复合膜对于Cu^(2+)的特定吸附引起的三芯光纤包层相对折射率的变化,实现对于Cu^(2+)浓度的精确检测。实验结果表明,随着Cu^(2+)浓度的增加,涂覆CS/PVA复合膜、Cu^(2+)印迹复合膜和优化Cu^(2+)印迹复合膜的光纤传感器透射谱监测波谷分别发生了红移、红移和蓝移。对比分析发现,涂覆优化Cu^(2+)印迹复合膜的传感器对于Cu^(2+)的响应最优,其响应灵敏度为62.258 pm·μmol^(-1)·L,检测限约为0.602μmol·L^(-1),且具有优秀的选择性和良好的pH稳定性。该传感器具有易制备、结构简单等优点,在水质Cu^(2+)的高选择监测方面有潜在的应用价值。

关键词：光纤光学 Cu^(2+)印迹壳聚糖/聚乙烯醇三芯光纤马赫-曾德尔干涉仪

在线全文

学校读者我要写书评

暂无评论

基于FPGA的光伏电池板最大功率跟踪

红外与激光工程 2014年第8期43卷 2699-2703页

作者：薛继元冯文林杨晓占重庆理工大学电子信息与自动化学院重庆400054 重庆理工大学光电信息学院重庆400054 时栅传感及先进检测技术重庆市重点实验室重庆400054

在光伏电池板的最大功率跟踪方法中,扰动观察法是最易于实现的方法,但要快速、准确地跟踪,效率不高,而采用从最大功率点附近开始跟踪的模糊控制步长扰动方法就可以改善这种情况。由于现场可编程门阵列具有成本低、设计灵活的特点,以Cycl... 详细信息

在光伏电池板的最大功率跟踪方法中,扰动观察法是最易于实现的方法,但要快速、准确地跟踪,效率不高,而采用从最大功率点附近开始跟踪的模糊控制步长扰动方法就可以改善这种情况。由于现场可编程门阵列具有成本低、设计灵活的特点,以Cyclone II系列的EP2C8Q208C8N控制芯片为核心,采用先按照要求整体设计控制系统框架,再将其分成各个小部分逐个实现它们的功能,最后连接所有经过验证的部分作为整体仿真验证输出结果的思路,可以实现对最大功率快速、有效的跟踪。

关键词：最大功率跟踪光伏电池板现场可编程门阵列