检索结果-南通市图书馆

Facile electrochemical surface-alloying and etching of Au wires to enable high-performance substrates for surface enhanced Raman scattering

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

Nano Materials Science 2024年第3期6卷 305-311页

作者： Yawen zhan Guobin zhang Junda shen Binbin Zhou Chenghao Zhao Junmei Guo Ming Wen Zhilong Tan Lirong Zheng Jian lu Yang Yang Li Center of Super-Diamond and Advanced Films(COSDAF) City University of Hong Kong83 Tat Chee AvenueKowloonHong KongChina Department of Materials Science and Engineering City University of Hong Kong83 Tat Chee AvenueKowloonHong KongChina Kunming Institute of Precious Metals Sino-platinum Metals Co.Ltd.KunmingYunan ProvinceChina Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research Institute8 Yuexing 1st RoadShenzhen Hi-Tech Industrial ParkNanshan DistrictShenzhenChina shenzhen Key Laboratory on Power Battery Safety Research and shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen518055China Institute of High Energy Physics Beijing100049China

Surface-enhanced Raman Spectroscopy(SERS)is a nondestructive technique for rapid detection of analytes even at the single-molecule ***,highly sensitive and reliable SERS substrates are mostly fabricated with complex nanofabrication techniques,greatly restricting their practical applications.A convenient electrochemical method for transforming the surface of commercial gold wires/foils into silver-alloyed nanostructures is demonstrated in this *** substrates are treated with repetitive anodic and cathodic bias in an electrolyte of thiourea,in a one-pot one-step manner.X-rays absorption fine structure(XAFS)spectroscopy confirms that the AuAg alloy is induced at the *** unique AuAg alloyed surface nanostructures are particularly advantageous when served as SERS substrates,enabling a remarkably sensitive detection of Rhodamine B(a detection limit of 10^(-14)M,and uniform strong response throughout the substrates at 10^(-12)M).

关键词： Electrodeposition Dealloying Surface-alloyed Noble metals Surface enhanced Raman spectroscopy substrates

Visible Light-Promoted Three-Component Carboazidation of Unactivated Alkenes with TMSN3 and Acrylonitrile

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2018年第11期36卷 1017-1023页

作者： BO Yang Xiang Ren xuzhong shen Tongtong Li zhan lu Department of Chemistry Zhejiang University Hangzhou 310058 China

A novel difunctionalization of unactivated alkenes has been reported via visible light‐promoted three‐component carboazidation using TMSN3 and acrylonitrile as partners without any stoichiometric oxidants. This protocol is operationally simple for straightforward access to azido derivatives with good functional group tolerance from readily available starting materials. A facile azido radical‐catalyzed [3 + 2] cycloaddition reaction of vinylcyclopropane with acrylonitrile was also observed to deliver a multi‐substituted cyclopentane.

关键词： alkene difunctionalization visible light photocatalysis three‐component reaction redox‐neutral organoazide azidyl radical

Thermal defluorination behaviors of PFOS,PFOA and PFBS during regeneration of activated carbon by molten salt

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

Frontiers of Environmental Science & Engineering 2022年第8期16卷 183-192页

作者： Zhichao shen lu zhan Zhenming Xu School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Ecological and Environmental Sciences East China Normal UniversityShanghai 200241China

Current study proposes a green regeneration method of activated carbon(AC)laden with Perfluorochemicals(PFCs)from the perspective of environmental safety and resource *** defluorination efficiencies of AC adsorbed perfluorooctanesulfonate(PFOS),perfluorooctanoic acid(PFOA)and perfluorobutanesulfonate(PFBS)using three molten sodium salts and one molten alkali were *** showed that defluorination efficiencies of molten NaOH for the three PFCs were higher than the other three molten sodium salts at lower *** 700°C,the defluorination efficiencies of PFOS and PFBS using molten NaOH reached to 84.2%and 79.2%,respectively,while the defluorination efficiency of PFOA was 35.3%.In addition,the temperature of molten salt,the holding time and the ratio of salt to carbon were directly proportional to the defluorination *** low defluorination efficiency of PFOA was due to the low thermal stability of PFOA,which made it difficult to be captured by molten *** weight loss range of PFOA was 75°C–125°C,which was much lower than PFOS and PFBS(400°C–500°C).From the perspective of gas production,fluorine-containing gases produced from molten NaOH-treated AC were significantly reduced,which means that environmental risks were significantly *** molten NaOH treatment,the regenerated AC had higher adsorption capacity than that of pre-treated AC.

关键词： PFCs Molten sodium hydroxide Thermal degradation Activated carbon regeneration

High-precision alkali-atom density measurement and control methods using light absorption for dual-beam SERF magnetometers

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2024年第5期22卷 41-46页

作者：刘子傲陆吉玺胡朝晖李晓昱闫一凡詹迪李建利 Key Laboratory of Ultra-Weak Magnetic Field Measurement Technology Ministry of EducationSchool of Instrumentation and Optoelectronic EngineeringBeihang UniversityBeijing 100191China Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology Hangzhou Innovation InstituteBeihang UniversityHangzhou 310051China Hefei National Laboratory Hefei 230088China shen Yuan Honors College Beihang UniversityBeijing 100191China

The alkali-atom density measurement method based on light absorption is highly suitable for a spin-exchange relaxationfree(SERF)atomic magnetometer because of its high-precision measurement and complete nonmagnetic *** this study,the optical rotation angle detection system based on polarization balance detection is utilized to realize the alkali-atom density real-time measurement without affecting magnetic field *** discovered that there exists an optimal frequency detuning of the probe light,which offers the highest sensitivity in alkali-atom density measurement and the lowest susceptibility to temperature fluctuations in terms of the scale *** contrast to conventional light absorption measurements based on pump light,this method demonstrated a threefold improvement in alkali-atom density measurement sensitivity while remaining immune to ambient magnetic fields and incident light intensity ***,we utilized this method to achieve closed-loop temperature control with an accuracy of 0.04℃.

关键词： light absorption temperature measurement and control dual-beam SERF magnetometer

Functional magnetic resonace imaging in patients with optic neuritis

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2014年第3期127卷 588-590页

作者： shen xuzhong Tao Chenghua Sun Li lu Zhaoceng Ye Wen Tang Weijun Department of Ophthalmology Huashan Hospital Fudan University Shanghai 200040 China Department of Radiology Huashan Hospital Fudan University Shanghai 200040 China

Optic neuritis （ON）,an acute inflammatory optic neuropathy,causes conduction blocks in the optic nerve and a series of visual functional *** is characterized not only by the inflammation of the optic nerve but also the visual dysfunction caused by the neuropathy involving optic chiasm,lateral geniculate body,optic radiation,and visual *** diagnosis mainly relies on the visual function evaluation using electrophysiology,vision examination,and magnetic resonance imaging （MRI）.However,pattern-visual evoked potential （P-VEP） and visual field examination have ***-oxygenation level dependent functional magnetic resonance imaging （BOLD-fMRI）,an integrative modality of the function,images and anatomy,can be used to monitor the status of brain activity in the functional areas in *** present study aimed to examine the status of functional activities of the visual cortex in the patients with optic neuritis using of BOLD-fMRI technique and to evaluate the application of fMRI in the optic ***：optic neuritis; functional magnetic resonance imaging,; visual field; pattern-visual evoked potential

关键词： optic neuritis functional magnetic resonance imaging, visual field pattern-visual evoked potential

在线全文

学校读者我要写书评

暂无评论

交通大数据质量控制架构与清洗方法

黑龙江交通科技 2024年第1期47卷 150-154页

作者：席加熠詹璐沈凯龙沈湘萍中交信捷科技有限公司北京100011 北京北大千方科技有限公司北京100085 天翼云科技有限公司北京100007

针对综合交通运输大数据中心数据质量不足、难以支撑应用的问题,基于ISACA数据治理思想提出交通数据质量控制架构与清洗治理方法,从规范性、完整性、一致性、准确性、时效性和可访问性六个维度明确数据质量校验规则,给出人工与自动化结... 详细信息

针对综合交通运输大数据中心数据质量不足、难以支撑应用的问题,基于ISACA数据治理思想提出交通数据质量控制架构与清洗治理方法,从规范性、完整性、一致性、准确性、时效性和可访问性六个维度明确数据质量校验规则,给出人工与自动化结合的数据清洗方法论。经成都市的轨道交通刷卡数据验证,共识别出刷卡数据表中票卡类型不规范、数据传输不及时等11项数据质量问题,并通过技术与管理双重手段校正90.9%的数据质量问题,后续传入的数据均符合要求。

关键词：智能交通数据质量校验规则清洗方法

高效液相色谱-串联质谱法测定蜂蜜中10种氨基糖苷类药物

在线全文

学校读者我要写书评

暂无评论

分析测试学报 2024年第7期43卷 1046-1051,1057页

作者：孙婷沈鹭英何金麟占永超严丽娟徐敦明厦门海关技术中心福建厦门361026

建立了高效液相色谱-串联质谱(HPLC-MS/MS)检测蜂蜜中10种氨基糖苷类药物(安普霉素、庆大霉素C1、卡那霉素、潮霉素B、巴龙霉素、阿米卡星、依替米星、奈替米星、妥布霉素和核糖霉素)残留量的方法。蜂蜜样品采用100 mmol/L磷酸盐缓冲液(... 详细信息

建立了高效液相色谱-串联质谱(HPLC-MS/MS)检测蜂蜜中10种氨基糖苷类药物(安普霉素、庆大霉素C1、卡那霉素、潮霉素B、巴龙霉素、阿米卡星、依替米星、奈替米星、妥布霉素和核糖霉素)残留量的方法。蜂蜜样品采用100 mmol/L磷酸盐缓冲液(pH 8.0)提取,SupelMIP SPE-Aminoglycosides分子印迹聚合物固相萃取柱净化,Thermo Hypercarb色谱柱分离,以5%氨水和乙腈为流动相进行梯度洗脱,采用HPLC-MS/MS电喷雾正离子模式检测,基质匹配标准曲线外标法定量。结果表明,10种氨基糖苷类药物在20~500μg/L范围内线性关系良好,方法定量下限为25μg/kg。在25、50、250μg/kg 3个加标水平下,10种氨基糖苷类药物的平均回收率为73.4%~93.2%,相对标准偏差(RSD)为5.2%~11%。该方法简便、灵敏度高,无需离子对试剂,有效减少了对质谱仪的污染,能够较好地满足蜂蜜中氨基糖苷类药物残留量的检测需要。

关键词：氨基糖苷类药物高效液相色谱-串联质谱分子印迹固相萃取蜂蜜

维普期刊数据库博看期刊

A mild one-step solvothermal route to truncated octahedral magnetite crystals

在线全文

学校读者我要写书评

暂无评论

Particuology 2014年第4期12卷 51-55页

作者： Donghui zhang lu Shang Jun shen zhan Shi Lizhu Wu Chenho Tung Tierui zhang Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Inorganic Synthesis & Preparative Chemistry College of ChemistryJilin University

Perfect truncated octahedral magnetite crystals were successfully synthesized from FeCl3.6H2O and poly（acrylic acid）（PAA） in an alkaline ethylene glycol solution via a mild one-step solvothermal process. The structure and morphologies of the obtained products were characterized by powder X-ray diffraction （XRD）, Raman spectroscopy, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM）. The effects of synthetic parameters including reaction temperature, reaction time, and the amount of alkali on the morphological evolution of the truncated octahedral magnetite crystals were systematically explored. 160℃ was found to be the optimum temperature for the formation of truncated octahedral magnetite crystals. Below 160 ℃, little magnetite was formed. Above 160℃, the truncated octahedrons were gradually transformed into irregular-shaped polyhedrons. Alkali is indispensable in promoting the formation of magnetite at mild temperatures. The truncated octahedral magnetite crystals were found to be ferromagnetic and had a saturation magnetization of about 83 emu/g.

关键词： Truncated octahedron Magnetite Solvothermal synthesis Magnetic Energy storage

Hypoxia-degradable and long-circulating zwitterionic phosphorylcholine-based nanogel for enhanced tumor drug delivery

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2021年第2期11卷 560-571页

作者： Shaojun Peng Boshu Ouyang Yongjie Xin Wei Zhao Shun shen Meixiao zhan Ligong lu Zhuhai Precision Medical Center Zhuhai Interventional Medical CenterZhuhai People’s Hospital(Zhuhai Hospital Affiliated with Jinan University)Zhuhai 519000China The Institute for Translational Nanomedicine Shanghai East HospitalTongji University School of MedicineShanghai 200120China Zhejiang Cancer Hospital Institute of Cancer ResearchHangzhou 310012China Central Laboratory First Affiliated HospitalInstitute(College)of Integrative MedicineDalian Medical UniversityDalian 116021China

Tumor microenvironment has been widely utilized for advanced drug delivery in recent years,among which hypoxia-responsive drug delivery systems have become the research *** hypoxia-responsive micelles or polymersomes have been successfully developed,a type of hypoxia-degradable nanogel has rarely been reported and the advantages of hypoxia-degradable nanogel over other kinds of degradable nanogels in tumor drug delivery remain ***,we reported the synthesis of a novel hypoxia-responsive crosslinker and the fabrication of a hypoxia-degradable zwitterionic poly(phosphorylcholine)-based(HPMPC)nanogel for tumor drug *** obtained HPMPC nanogel showed ultra-long blood circulation and desirable immune compatibility,which leads to high and long-lasting accumulation in tumor ***,HPMPC nanogel could rapidly degrade into oligomers of low molecule weight owing to the degradation of azo bond in hypoxic environment,which leads to the effective release of the loaded ***,HPMPC nanogel showed superior tumor inhibition effect both in vitro and in vivo compared to the reduction-responsive phosphorylcholine-based nanogel,owing to the more complete drug ***,the drug-loaded HPMPC nanogel exhibits a pronounced tumor inhibition effect in a humanized subcutaneous liver cancer model with negligible side effects,which showed great potential as nanocarrier for advanced tumor drug delivery.

关键词： Hypoxia-degradable Zwitterionic nanogel Long blood circulation Drug release Drug delivery