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Tuning plasmon absorption of unmodified silver nanoplates for sensitive and selective detection of copper ions by introduction of ascorbate

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Chinese Chemical Letters 2014年第10期25卷 1403-1406页

作者： xiao-dong xia Tian-Lun Wang xiao-Yuan Yuan Key Laboratory of Theoretical Chemistry and Molecular Simulation Minister of EducationSchool of Chemistry and Chemical EngineeringHunan University of Science and Technology

Silver nanoplates as novel optical sensors for Cu^2＋ detection have been *** nanoplates are synthesized via previous H_2O_2-NaBH_4 cyclic oxidation-reduction *** introduction of ascorbate as mild reductants,Cu^2＋ ions are reduced into Cu~＋ and the Cu^＋ is further reduced to Cu,which is deposited on the surface of the silver *** deposition of the Cu on the surface of the silver nanoplates allows a significant red-shift of their plasmon ***,trace Cu^2＋ can be *** shift of the plasmon absorption wavelength of silver nanoplates is proportional to the Cu^2＋concentration over a range of 40-340 μmol L^（-1） with a limit of detection of 9.0 μmol L^（-1）.Moreover,such silver nanoplate-based optical sensors provide good selectivity for Cu^2＋ detection,and most other metal ions do not disturb its ***,the practicality of the proposed sensor was *** Cu^2＋assay is advantageous in its simplicity,selectivity,and cost-effectiveness.

关键词： Silver nanoplate Plasmon absorption Wavelength shift Optical sensor Copper ions Ascorbate

Two New C_(19)-Diterpenoid Alkaloids from Delphinium davidii Franch

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Chinese Chemical Letters 2006年第11期17卷 1473-1476页

作者： xiao xia LIANC dong Lin CHEN Feng Peng WANG Department of Chemistry of Medicinal Natural Products West China College of Pharmacy Sichuan University Chengdu 610041

Two new C19-diterpenoid alkaloids, davidisines A （1） and B （2） along with thirteen known alkaloids were isolated from the whole herb of Delphinium davidii Franch. Their structures were established by spectral meth... 详细信息

关键词： Delphinium davidii Franch. C19-diterpenoid alkaloids davidisine A davidisine B

A quantitative colorimetric assay of H_2O_2 and glucose using silver nanoparticles induced by H_2O_2 and UV

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Chinese Chemical Letters 2013年第12期24卷 1053-1058页

作者： Yu Zhang Yan-Jun Zhang xiao-dong xia xiao-Qi Hou Cheng-Ting Feng Jian-Xiu Wang Liu Deng College of Chemistry and Chemical Engineering Central South University

A simple spectrophotometric assay of H2O2 and glucose using Ag nanoparticles has been carried out. Relying on the synergistic effect of H2O2 reduction and ultraviolet （UV） irradiation, Ag nanoparticles with enhanced absorption signals were synthesized. H2O2 served as a reducing agent in the Ag nanoparticles formation in which Ag＋ was reduced to Ago by O2- generated via the decomposition of H2O2 in alkaline media. On the other hand, photoreduction of Ag＋ to Ago under UV irradiations also contributed to the nanoparticles formation. The synthesized nanoparticles were characterized by TEM, XPS, and XRD. The proposed method could determine H2O2 with concentrations ranging from 5.0× 10^-7 to 6.0× 10^-5 tool/ L The detection limit was estimated to be 2.0 × 10^-7 mol/L. Since the conversion of glucose to gluconic acid catalyzed by glucose oxidase was companied with the formation of H2O2, the sensing protocol has been successfully utilized for the determination of glucose in human blood samples. The results were in good agreement with those determined by a local hospital. This colorimetric sensor thus holds great promises in clinical applications.

关键词： Silver nanoparticles Colorimetric assay H2O2 Glucose

Dosimetry Comparison between Volumetric Modulated Arc Therapy with RapidArc and Fixed Field Dynamic IMRT for Local-Regionally Advanced Nasopharyngeal Carcinoma

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Chinese Journal of Cancer Research 2011年第4期23卷 259-264页

作者： Bao-min Zheng xiao-xia dong Hao Wu You-jia Duan Shu-kui Han Yan Sun Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education) Department of RadiotherapyPeking University School of Oncology Beijing Cancer Hospital & Institute Beijing 100142 China

Objective: A dosimetric study was performed to evaluate the performance of volumetric modulated arc radiotherapy with RapidArc on locally advanced nasopharyngeal carcinoma (NPC). Methods: The CT scan data sets of 20 patients of locally advanced NPC were selected randomly. The plans were managed using volumetric modulated arc with RapidArc and fixed nine-field coplanar dynamic intensity-modulated radiotherapy (IMRT) for these patients. The dosimetry of the planning target volumes (PTV), the organs at risk (OARs) and the healthy tissue were evaluated. The dose prescription was set to 70 Gy to the primary tumor and 60 Gy to the clinical target volumes (CTV) in 33 fractions. Each fraction applied daily, five fractions per week. The monitor unit (MU) values and the delivery time were scored to evaluate the expected treatment efficiency. Results: Both techniques had reached clinical treatment’s requirement. The mean dose (Dmean), maximum dose (Dmax) and minimum dose (Dmin) in RapidArc and fixed field IMRT for PTV were 68.4±0.6 Gy, 74.8±0.9 Gy and 56.8±1.1 Gy; and 67.6±0.6 Gy, 73.8±0.4 Gy and 57.5±0.6 Gy (P0.05). Compared to IMRT, RapidArc allowed a reduction of Dmean to the brain stem, mandible and optic nerves of 14.1% (P<0.05), 5.6% (P<0.05) and 12.2% (P<0.05), respectively. For the healthy tissue and the whole absorbed dose, Dmean of RapidArc was reduced by 3.6% (P<0.05), and 3.7% (P<0.05), respectively. The Dmean to the parotids, the spinal cord and the lens had no statistical difference among them. The mean MU values of RapidArc and IMRT were 550 and 1,379. The mean treatment time of RapidArc and IMRT was 165 s and 447 s. Compared to IMRT, the delivery time and the MU values of RapidArc were reduced by 63% and 60%, respectively. Conclusion: For locally advanced NPC, both RapidArc and IMRT reached the c

关键词： Volumetric modulated arc therapy Intensity-modulated radiotherapy Dosimetry Target volume Nasopharyngeal carcinoma

股权分置改革中的产权重置、价值重估与多重博弈

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西北大学学报（哲学社会科学版） 2007年第5期37卷 174-176页

作者：夏小东西安交通大学经济与金融学院陕西西安710061

为了对股权分置改革进行经济学解释,通过构建一个均衡对价模型和一个多重动态博弈模型,结果发现,建立多种产权形式之间基于对价博弈的产权交易机制、实现产权激励相容,远比对价本身是否合理更为重要,从而揭示了改革得以成功的逻辑。

关键词：二元产权结构对价股权分置改革

中国银行业经济资本管理的实施路径——从巴塞尔新资本协议获得的启示

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金融论坛 2007年第7期12卷 54-57页

作者：夏小东西安交通大学经济金融学院

经济资本是加强商业银行内部资本管理和风险管理的重要手段。借助经济资本和其他基于风险的管理工具,金融机构可以对其面临的风险进行量化,计算应对这些风险所需的资本及得出根据实际风险进行调整后的收益。对大多数国内银行而言,经济... 详细信息

经济资本是加强商业银行内部资本管理和风险管理的重要手段。借助经济资本和其他基于风险的管理工具,金融机构可以对其面临的风险进行量化,计算应对这些风险所需的资本及得出根据实际风险进行调整后的收益。对大多数国内银行而言,经济资本的应用已经落后于其他先进国家,本文试图从新资本协议IRB方法的基本思路入手,提出国内银行业在现有条件下提升经济资本计量水平的解决方案。并提出在目前条件下,为实现有效资本管理的最终目标,要尽快开发关键风险参数的量化模型,加强资本管理IT系统建设以及建立资本计划的制定和实施程序。

关键词：经济资本管理巴塞尔新资本协议信用风险违约概率违约损失率

Potential dependence in electrocatalysis: a theoretical perspective

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Science China Chemistry 2025年第1期68卷 21-25页

作者： Leyu Liu Zhaoming xia Zeyu Wang Yinjuan Chen Hai xiao Department of Chemistry Tsinghua University Fundamental Science Center of Rare Earths Ganjiang Innovation Academy Chinese Academy of Sciences Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation Center Changzhou University

Electrocatalysis is a key technology for the new energy era and sustainable development, serving as the interface for interconversion of electrical and chemical energies, which spans a wide spectrum of applications in sustainable energy and environmental engineering. Electrocatalytic reactions including electrochemical CO2reduction reaction （eCO2RR）, hydrogen evolution reaction （HER）, and oxygen evolution/reduction reactions （OER/ORR）, hold essential promise for renewable energy technologies as well as complement the biogeochemical carbon and oxygen cycles.

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基于单片机的远程无线控制系统设计

煤矿机械 2011年第8期32卷 222-224页

作者：夏小东中国矿业大学机电工程学院江苏徐州221008

主要介绍了一种以单片机AT89C2051、无线模块APC200A-43和继电器为核心的远程智能控制系统。该系统通过对单片机功能的研究,使用单片机的输入输出口和中断实现对控制信号的处理,通过调试无线通讯模块,控制接近开关实现对远程电机的启动... 详细信息

主要介绍了一种以单片机AT89C2051、无线模块APC200A-43和继电器为核心的远程智能控制系统。该系统通过对单片机功能的研究,使用单片机的输入输出口和中断实现对控制信号的处理,通过调试无线通讯模块,控制接近开关实现对远程电机的启动、停止等控制。

关键词：单片机远程无线控制无线模块接近开关

产权约束、租金效应与资本市场制度博弈——对中国资本市场发展的一种解释

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西安交通大学学报（社会科学版） 2007年第4期27卷 24-27页

作者：夏小东西安交通大学经济与金融学院陕西西安710061

自1999-2000年以来,中国资本市场的发展开始延伸到了以推动存量股份交易为主要内容的产权结构调整阶段,并且伴随着不同产权主体的利益冲突,市场均衡逐步经历了一个由均衡到失衡再到新均衡建立的变迁过程。立足于国家理论及其资本市场租... 详细信息

自1999-2000年以来,中国资本市场的发展开始延伸到了以推动存量股份交易为主要内容的产权结构调整阶段,并且伴随着不同产权主体的利益冲突,市场均衡逐步经历了一个由均衡到失衡再到新均衡建立的变迁过程。立足于国家理论及其资本市场租金效应,以中国资本市场的二元产权结构及其产权约束为为切入点,对中国资本市场制度变迁予以了经济学解释,指出以实现产权激励相容为核心的市场化改革取向是资本市场最终打破初始制度的低效率均衡并实现新均衡的基本途径。

关键词：国家模型二元产权结构制度变迁