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Nano Research 2017年第7期10卷 2395-2404页

作者： Sanggon Kim Sabrina Bailey Ming Liu ruoxue yan Department of Chemical and Environmental Engineering University of California Riverside California 9252 1 USA Department of Electrical Engineering University of California Riverside California 92521 USA

Knowledge of surface plasmon polariton （SPP） modes in one-dimensional （1D） metallic nanostructures is essential for the development of subwavelength optical devices such as photonic circuits, integrated light sources, and photo- detectors. Despite many efforts to characterize the propagation parameters of these subwavelength 1D plasmonic waveguides, such as Ag nanowires, large discrepancies exist among available reports owing to their sensitivity to the relative weights of co-existing SPP modes and the lack of a method of decoupling these modes and analyzing them separately. In this work, we develop an interference method to distinguish different SPP modes that are simultaneously excited in a Ag nanowire waveguide and measure their propagation parameters separately. By extracting information from the propagation-distance- dependent intensity oscillations of the scattered light from the nanowire tip, the effective refractive indices, propagation lengths, and relative mode weights of co-existing SPP modes supported by the nanowire are derived from a mode interference model. These parameters depend strongly on the nanowire diameter and excitation wavelength. In particular, we demonstrate the possibility of selective excitation of different SPP modes by varying the nanowire diameter. This new mode analysis technique provides unique insights into the develop- ment and optimization of SPP-based applications.

关键词： surface plasmon polariton(SPP) silver nanowire propagation length effective refractive index mode weight

Alumina-coated Ag nanocrystal monolayers as surfaceenhanced Raman spectroscopy platforms for the direct spectroscopic detection of water splitting reaction intermediates

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Nano Research 2014年第1期7卷 132-143页

作者： Xing Yi Ling ruoxue yan Sylvia Lo Dat Tien Hoang Chong Liu Melissa A. Fardy Sher Bahadar Khan Abdullah M. Asiri Salem M. Bawaked Peidong yang Department of Chemistry University of California Berkeley CA 94720-1460 USA Center of Excellence for Advanced Materials Research (CEAMR) King Abdulaziz University Jeddah 21589 P.O. Box 80203 Saudi Arabia Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore Department of Chemical and Environmental Engineering. University of California Riverside CA 9252 1 USA These authors contributed equally to this work.

A novel Ag-alumina hybrid surface-enhanced Raman spectroscopy （SERS） platform has been designed for the spectroscopic detection of surface reactions in the steady state. Single crystalline and faceted silver （Ag） nanoparticles with strong light scattering were prepared in large quantity, which enables their reproducible self-assembly into large scale monolayers of Raman sensor arrays by the Langrnuir-Blodgett technique. The close packed sensor film contains high density of sub-nm gaps between sharp edges of Ag nanoparticles, which created large local electromagnetic fields that serve as ＂hot spots＂ for SERS enhancement. The SERS substrate was then coated with a thin layer of alumina by atomic layer deposition to prevent charge transfer between Ag and the reaction system. The photocatalytic water splitting reaction on a monolayer of anatase TiO2 nanoplates decorated with Pt co-catalyst nanoparticles was employed as a model reaction system. Reaction intermediates of water photooxidation were observed at the TiO2/solution interface under UV irradiation. The surface-enhanced Raman vibrations corresponding to peroxo, hydroperoxo and hydroxo surface intermediate species were observed on the TiO2 surface, suggesting that the photo-oxidation of water on these anatase TiO2 nanosheets may be initiated by a nucleophilic attack mechanism.

关键词： surface-enhanced Ramanspectroscopy water splitting reaction reaction intermediates Ag nanocrystals

Ultrathin-shell epitaxial Ag@Au core-shell nanowires for high-performance and chemically-stable electronic, optical, and mechanical devices

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Nano Research 2021年第11期14卷 4294-4303页

作者： yangzhi Zhu Sanggon Kim Xuezhi Ma Peter Byrley Ning Yu Qiushi Liu Xiaoming Sun Da Xu Sangshan Peng Martin C.Hartel Shiming Zhang Vadim Jucaud Mehmet R.Dokmeci Ali Khademhosseini ruoxue yan Department of Chemical and Environmental Engineering Bourns College of EngineeringUniversity of California-RiversideRiversideCA92521USA Terasaki Institute for Biomedical Innovation Los AngelesCA90064USA Department of Electrical and Computer Engineering University of California-RiversideRiversideCA92521USA State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha410082China Department of Bioengineering University of California-Los AngelesLos AngelesCA90095USA Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina Material Science and Engineering Program University of California-RiversideRiversideCA92521USA

Silver nanowires (AgNWs) hold great promise for applications in wearable electronics, flexible solar cells, chemical and biological sensors, photonic/plasmonic circuits, and scanning probe microscopy (SPM) due to their unique plasmonic, mechanical, and electronic properties. However, the lifetime, reliability, and operating conditions of AgNW-based devices are significantly restricted by their poor chemical stability, limiting their commercial potentials. Therefore, it is crucial to create a reliable oxidation barrier on AgNWs that provides long-term chemical stability to various optical, electrical, and mechanical devices while maintaining their high performance. Here we report a room-temperature solution-phase approach to grow an ultra-thin, epitaxial gold coating on AgNWs to effectively shield the Ag surface from environmental oxidation. The Ag@Au core-shell nanowires (Ag@Au NWs) remain stable in air for over six months, under elevated temperature and humidity (80 °C and 100% humidity) for twelve weeks, in physiological buffer solutions for three weeks, and can survive overnight treatment of an oxidative solution (2% H2O2). The Ag@Au core-shell NWs demonstrated comparable performance as pristine AgNWs in various electronic, optical, and mechanical devices, such as transparent mesh electrodes, surface-enhanced Raman spectroscopy (SERS) substrates, plasmonic waveguides, plasmonic nanofocusing probes, and high-aspect-ratio, high-resolution atomic force microscopy (AFM) probes. These Au@Ag core-shell NWs offer a universal solution towards chemically-stable AgNW-based devices without compromising material property or device performance.

关键词： epitaxial growth core-shell nanowire plasmonic waveguides atomic force microscopy(AFM)probe transparent electrode wearable electronics

论我国受控制冷剂销毁的紧迫性及潜在新技术开发的重要性

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制冷与空调 2021年第7期21卷 61-66页

作者：史琳安青松戴晓业闫若雪清华大学热科学与动力工程教育部重点实验室天津大学中低温热能高效利用教育部重点实验室

含氢氯氟烃HCFCs和具有高全球升温潜能值的氢氟烃HFCs,作为《蒙特利尔议定书》规定替代和削减的主要对象,未来几十年间处理需求量巨大,因此受控制冷剂的销毁处理是制冷剂替代工作推进的重要一环。常用的受控制冷剂销毁处理方式主要有液... 详细信息

含氢氯氟烃HCFCs和具有高全球升温潜能值的氢氟烃HFCs,作为《蒙特利尔议定书》规定替代和削减的主要对象,未来几十年间处理需求量巨大,因此受控制冷剂的销毁处理是制冷剂替代工作推进的重要一环。常用的受控制冷剂销毁处理方式主要有液体喷射焚烧法、转炉焚烧法、等离子分解法及催化降解法等。本文首先综述了受控制冷剂销毁处理技术的研究进展及应用现状,同时介绍了一种低能耗、环境友好的连续高效降解废弃制冷剂的潜在新工艺路线——太阳能光热催化降解技术,并希望通过提出制冷剂回收销毁环节的发展建议来给制冷剂产业注入新的活力。

关键词：制冷剂销毁焚烧销毁催化降解光热协同催化

地方院校设计学类专业学位论文写作质量提升研究

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湖南包装 2024年第3期39卷 202-205页

作者：李妍梁若雪保定学院美术与设计学院河北保定071000

设计学类专业学位论文能够综合体现设计学类学生的学术规范、学术素养、知识创新、解决实际问题的能力,提升地方院校设计学类专业学位论文写作质量具有重要意义。研究对地方学院设计学类专业学位论文质量进行分析,从导师层面、文本层面... 详细信息

设计学类专业学位论文能够综合体现设计学类学生的学术规范、学术素养、知识创新、解决实际问题的能力,提升地方院校设计学类专业学位论文写作质量具有重要意义。研究对地方学院设计学类专业学位论文质量进行分析,从导师层面、文本层面对设计学类专业学位论文质量问题进行多维度剖析。基于研究结果,从导师队伍建设、学生自主性提升、建立本科导师制等角度,提出地方院校设计学类专业学位论文写作质量提升的对策与建议,以期助力地方学院设计学类专业论文质量提升与发展。

关键词：设计学类专业本科学位论文论文质量地方院校

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“双碳”背景下天然工质的改革及减排潜力

华电技术 2021年第11期43卷 85-90页

作者：安青松闫若雪孙博阳马一太天津大学中低温热能高效利用教育部重点实验室天津300350

工质通常被称为热力循环系统的"血液",在热工循环中起着至关重要的作用。随着我国"双碳"目标的确立,以及《〈关于消耗臭氧层物质的蒙特利尔议定书〉基加利修正案》的生效,我国开启了协同应对臭氧层损耗和气候变化的新篇章,这对工质的选... 详细信息

工质通常被称为热力循环系统的"血液",在热工循环中起着至关重要的作用。随着我国"双碳"目标的确立,以及《〈关于消耗臭氧层物质的蒙特利尔议定书〉基加利修正案》的生效,我国开启了协同应对臭氧层损耗和气候变化的新篇章,这对工质的选用提出了更高的要求。介绍了工质发展简史及现阶段面临的主要挑战,并详细阐述天然工质的物性及应用情况。R744(CO_(2)),R718(H_(2)O),R717(NH_(3)),碳氢类(HCs)等天然工质有较优的环保性能,在工质改革中被寄予很大的希望,成为了替代传统工质(HFCs)的主要研究对象。如何以天然工质替代传统工质在制冷热泵系统中的应用需要进一步的审视,同时,开发者应更加重视工质与系统和技术的适匹性。最后,通过对未来各应用场景下可实现的碳减排效果进行测算,希望为全面了解"双碳"目标下的天然工质替代方案和减排潜力提供参考。

关键词：天然工质 “双碳”目标基加利修正案制冷与热泵碳减排潜力零臭氧破坏潜能全球变暖潜能

基于改进模糊神经网络的变压器故障诊断的研究

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成都工业学院学报 2019年第2期22卷 43-45页

作者：祁萌王艳何若雪成都工业学院电子工程学院成都611730 成都工业学院网络与通信工程学院成都611730

电网在全国联网运行的现有格局下,对变压器故障的监测、诊断和预报提出了更高的技术要求。针对电力行业中有效监测变压器运行状况、及时准确进行故障诊断的实际需求,提出了一种基于模糊神经网络的变压器故障诊断算法。该算法通过利用PS... 详细信息

电网在全国联网运行的现有格局下,对变压器故障的监测、诊断和预报提出了更高的技术要求。针对电力行业中有效监测变压器运行状况、及时准确进行故障诊断的实际需求,提出了一种基于模糊神经网络的变压器故障诊断算法。该算法通过利用PSO算法获得模糊神经网络参数,并结合变压器油中溶解气体分析法对变压器进行故障诊断。相对于网络参数随机生成的传统模式模糊神经网络算法,本文所提出的方法,具有故障诊断准确率高、网络训练时间短等优势。Matlab实验仿真表明,本文所提出的方法在变压器故障诊断方面切实可行,且相对于传统方法具有明显优势。

关键词：电力变压器粒子群算法模糊神经网络故障诊断 Matlab仿真

基于改进PSO-BP算法的中药材适生地选址研究

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成都工业学院学报 2019年第1期22卷 45-47页

作者：祁萌王艳何若雪成都工业学院电子工程学院成都611730 成都工业学院网络与通信工程学院成都611730

中药材品质的形成和环境因子有着密切的关系,以黄岑为例,分析其生境环境因子,根据不同地理位置的环境因子,结合生物适生地分析系统数据,通过构建改进的基于大数据的神经网络模型对其进行训练,从而找到收益最高的地理位置,挖掘更高的商... 详细信息

中药材品质的形成和环境因子有着密切的关系,以黄岑为例,分析其生境环境因子,根据不同地理位置的环境因子,结合生物适生地分析系统数据,通过构建改进的基于大数据的神经网络模型对其进行训练,从而找到收益最高的地理位置,挖掘更高的商业价值。

关键词：神经网络模型大数据种植基地生物适生地分析系统

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水铝英石对Cs的吸附及固化性能研究

原子能科学技术 2023年第2期57卷 234-243页

作者：辜证成邹若雪崔政郭建锋吴艳上海交通大学核科学与工程学院上海200240 中核四〇四有限公司甘肃嘉峪关732850

^(137)Cs在乏燃料中具有高产额、强放射性、高释热等特点,为将^(137)Cs进行稳定固化保证其长期处置安全,本文研究了水铝英石对Cs的吸附性能、固封性能和固封机制。通过调控溶液的初始浓度和pH值,研究了水铝英石对Cs的吸附性能。结果显示... 详细信息

^(137)Cs在乏燃料中具有高产额、强放射性、高释热等特点,为将^(137)Cs进行稳定固化保证其长期处置安全,本文研究了水铝英石对Cs的吸附性能、固封性能和固封机制。通过调控溶液的初始浓度和pH值,研究了水铝英石对Cs的吸附性能。结果显示,在pH=5条件下,Cs的吸附率为90%,饱和吸附容量达11.1 mg/g。Cs在水铝英石上的吸附为单层吸附与多层吸附的共同作用。通过冷压-烧结工艺制备了铯榴石陶瓷固化体,研究了烧结温度和固化配方对烧结产物性能的影响。实验表明,烧结温度为1200℃时,可生成铯榴石晶相,减容率超过55%,Cs固定率接近100%,说明水铝英石能稳定固封Cs。固化体的晶相结构与Cs的含量有关,当Cs质量含量为1%时,K原子在高温下能与Cs发生类质同象,形成Cs_(x)K_(1-x)AlSi_(2)O_(6)混晶结构,达到10%时主要为铯榴石晶相。密度泛函(DFT)计算揭示,Cs以离子键和共价键形式与铯榴石晶体中的其他原子结合。

关键词：固化吸附铯水铝英石 DFT