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In situ non-destructive measurement of Josephson junction resistance using fritting contact technique
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作者 Lei Du Hao-Ran Tao +7 位作者 Liang-Liang Guo Hai-Feng Zhang Yong Chen Xin Tian Chi Zhang Zhi-Long Jia Peng Duan Guo-Ping Guo 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第11期57-61,共5页
Conventional four-probe methods for measuring the resistance of Josephson junctions can damage superconducting thin films,making them unsuitable for frequency measurements of superconducting qubits.In this study,we pr... Conventional four-probe methods for measuring the resistance of Josephson junctions can damage superconducting thin films,making them unsuitable for frequency measurements of superconducting qubits.In this study,we present a custom probe station measurement system that employs the fritting contact technique to achieve in situ,non-destructive measurements of Josephson junction resistance.Our experimental results demonstrate that this method allows for accurate prediction of qubit frequency with an error margin of 17.2 MHz.Moreover,the fritting contact technique does not significantly affect qubit coherence time or the integrity of the superconducting film,confirming its non-destructive nature.This innovative approach provides a dependable foundation for frequency tuning and addressing frequency collision issues,thus supporting the advancement and practical deployment of superconducting quantum computing. 展开更多
关键词 NON-DESTRUCTIVE fritting contact qubit frequency Josephson junction resistance
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Developing Low Temperature Glazes for Omani Clay Artworks: Laboratory Investigation to Reduce Costs by Using Frits
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作者 Badar Almamari Najlaa Alsaadi Qais Alsalhi 《New Journal of Glass and Ceramics》 CAS 2023年第2期17-34,共18页
The role of using frits in developing glazes for ceramics has increasingly received attention across a number of industrial ceramics fields in recent years. Over the past decade, the link between using frits for devel... The role of using frits in developing glazes for ceramics has increasingly received attention across a number of industrial ceramics fields in recent years. Over the past decade, the link between using frits for developing ceramics glazes and the reduction of financial costs has been at the center of much attention. Determining the impact of using frits in the local ceramics industry in Oman is important for the future study of this creative field. Using imported ready-made glazes, despite their long commercial success, is associated with a number of problems, including a shortage of suppliers, high costs, and logistical difficulties. Consequently, there is an urgent need to address the importance of developing glazes locally to help establish some workable solutions for the aforementioned problems. To date, no research studies have investigated using local Omani earthenware clays to make glazes by combining them with commercial frits using empirical laboratory methodologies. By developing low temperature chemical glaze recipes, the main aim of this study is to explore the possibilities of using Omani earthenware clays (OECs) and frits to create glazes that are suitable for local Omani ceramic works. 展开更多
关键词 Omani Earthenware Clays CERAMICS Frits
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基于Finite Ridgelet变换的去噪算法研究 被引量:1
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作者 刘祝华 邹道文 +2 位作者 钟华 邓承志 汪胜前 《计算机工程与应用》 CSCD 北大核心 2005年第18期42-44,87,共4页
该文对Ridgelet变换以及FRIT(FiniteRidgeletTransform)变换作了介绍,并在此基础上提出了基于FRIT变换的平移不变去噪算法。实验证明该算法能有效地去除图像的高斯噪声,同时能很好地保留图像的细节信息。
关键词 Ridgelet 变换 FRIT 平移不变去噪
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基于小波基向量的改进FRIT去噪方法 被引量:5
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作者 郭旭静 侯正信 《电子测量与仪器学报》 CSCD 2005年第6期49-54,共6页
计算小波变换的Mallat算法需要逐级分解和重构,而本文通过矩阵变换方法,给出不需逐级计算的小波分解和重构矩阵的构造方法,并给出9/7小波的分解和重构矩阵的基向量及波形图。另外,本文改进了一种新型的图像方向性表示方法———有限域Ri... 计算小波变换的Mallat算法需要逐级分解和重构,而本文通过矩阵变换方法,给出不需逐级计算的小波分解和重构矩阵的构造方法,并给出9/7小波的分解和重构矩阵的基向量及波形图。另外,本文改进了一种新型的图像方向性表示方法———有限域Ridgelet变换(FRIT),通过折叠分块和增加零行的方法克服了原FRIT需要构造素数长度的小波基的缺点,使小波变换的基向量可直接应用于FRIT中,计算方法和计算量都得到简化。实验表明,在对具有直线特征的图像去噪方面其性能优于FRIT。 展开更多
关键词 有限域Ridgelet变换(FRIT) 小波变换 基向量 图像去噪
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基于小波变换矩阵的改进脊波变换图像去噪 被引量:6
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作者 王宏志 刘媛媛 孙琦 《吉林大学学报(理学版)》 CAS CSCD 北大核心 2010年第1期99-103,共5页
针对Mallat算法构造小波变换矩阵处理图像.为解决有限域脊波变换(FRIT)只能应用于素数像素大小的图像且图像处理中产生随机信号和"环绕"的问题,提出3种改进型FRIT方法,并将其与不同边界延拓方法相结合应用于图像去噪中.实验... 针对Mallat算法构造小波变换矩阵处理图像.为解决有限域脊波变换(FRIT)只能应用于素数像素大小的图像且图像处理中产生随机信号和"环绕"的问题,提出3种改进型FRIT方法,并将其与不同边界延拓方法相结合应用于图像去噪中.实验结果表明,所给方法在对于具有直线特征的图像去噪方面性能较优. 展开更多
关键词 MALLAT算法 小波变换矩阵 有限域脊波变换(FRIT) 边界延拓 图像去噪
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BRIGHT LONG AFTERGLOW PHOSPHORESCENCE GLASS MADE OF SrAl_(2)O_(4): Eu^(2+), Dy^(3+) AND GLASS FRITS 被引量:1
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作者 X. Y. Zhang Z. F. Cao L.P. Lu Z.H. Bai W.Z. Wang X. C. Wang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2005年第6期736-740,共5页
Bright long afterglow phosphorescence glasses were prepared by using SrAl2O4: Eu^2+, Dy^3+ phosphors and suitable glass frits together. The SrAl2O4: Eu^2+, Dy^3+ phosphors were initially prepared by the solid re... Bright long afterglow phosphorescence glasses were prepared by using SrAl2O4: Eu^2+, Dy^3+ phosphors and suitable glass frits together. The SrAl2O4: Eu^2+, Dy^3+ phosphors were initially prepared by the solid reaction method. Three kinds of glass frits were prepared to match the SrAl2O4: Eu^2+, Dy^3+ phosphors. Effects of the compositions of the glass frits, the ratios of the phosphors to the frits us well us the firing temperature and firing times on the properties of the samples were discussed. XRD analysis indicated the samples exhibited the typical diffraction peaks of SrAlwO4: Eu^2+, Dy^3+. The emission spectra of the samples showed broad bands peaking at 510nm.The excitation spectra of the samples showed broad bands ranging from 300 to 480hm. These are believed due to the 5d4f-4f transitions of Eu^2+ in the SrAl2O4: Eu^2+, Dy^3+ phosphors. The afterglow luminescence of the samples excited by a 40W fluorescence lamp for 30min can be observed in the dark for more lOh with the naked eyes. It can find wide applications in many fields. 展开更多
关键词 long afterglow phosphorescence glass StAl2O4 :Eu^2+ Dy^3+ glass frit
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Preparation of silver-coated glass frit and its application in silicon solar cells 被引量:2
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作者 向锋 李碧渊 +2 位作者 黎应芬 周健 甘卫平 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第7期520-524,共5页
A simple electroless plating process was employed to prepare silver-coated glass frits for solar cells. The surface of the glass frits was modified with polyvinyl-pyrrolidone(PVP) before the electroless plating proc... A simple electroless plating process was employed to prepare silver-coated glass frits for solar cells. The surface of the glass frits was modified with polyvinyl-pyrrolidone(PVP) before the electroless plating process. Infrared(IR) spectroscopy,field emission scanning electron microscopy(FESEM), and x-ray diffraction(XRD) were used to characterize the PVP modified glass frits and investigate the mechanism of the modification process. It was found that the PVP molecules adsorbed on the glass frit surface and reduced the silver ions to the silver nanoparticles. Through epitaxial growth, these nanoparticles were uniformly deposited onto the surface of the glass frit. Silicon solar cells with this novel silver coating exhibited a photoelectric conversion efficiency increase of 0.33%. Compared with the electroless plating processes, this method provides a simple route to prepare silver-coated glass frits without introducing impurity ions. 展开更多
关键词 electroless plating silver nanoparticle glass frit solar cell
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Study on Thermal Expansion Coefficient of Sealing Materials for Ceramic Metal Halide Lamps
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作者 刘玉柱 耿志挺 +1 位作者 庄卫东 何华强 《Journal of Rare Earths》 SCIE EI CAS CSCD 2007年第2期249-252,共4页
With Al2O3, Dy2O3, and SiO2 as starting materials, the basic glass of Al2O3-Dy2O3-SiO2 system was prepared by conventional melting technology, and their thermal expansion coefficients (TECs) at different anneal time... With Al2O3, Dy2O3, and SiO2 as starting materials, the basic glass of Al2O3-Dy2O3-SiO2 system was prepared by conventional melting technology, and their thermal expansion coefficients (TECs) at different anneal time were investigated. TECs of the basic glass, which were heat-treated under different temperature, were also investigated. The result showed that TECs of the basic glass gradually approached a fixed value as the anneal time was extended, which suggested that most of the inner stress had been eliminated. After heat treatment, the contents of Dy2O3, Dy2Si2O7, and a new crystal increased up to 1200 ℃ and decreased below 1250 ℃, which was consistent with the TEC change of crystallized samples. This suggests that the crystal has a direct effect on TECs of the crystallized samples. 展开更多
关键词 thermal expansion coefficient sealing frit material ceramic metal halide lamp rare earths
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Corrosion Behaviour of Al6061-Frit Particulate Metal Matrix Composites in Sodium Chloride Solution
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作者 Dasappa Ramesh Ragera Parameshwarappa Swamy Tumkur Krishnamurthy Chandrashekar 《Journal of Minerals and Materials Characterization and Engineering》 2013年第1期15-19,共5页
In this investigation, an attempt has been made to develop Al6061-Frit particulate metal matrix composites through stir casting technique using metal molds and to study the corrosion behaviour. Pre heated frit particl... In this investigation, an attempt has been made to develop Al6061-Frit particulate metal matrix composites through stir casting technique using metal molds and to study the corrosion behaviour. Pre heated frit particles were added to matrix as reinforcement. Al6061 containing 2 wt% to 8 wt % in steps of 2 wt % of frit particulate composites were prepared. Corrosion tests were conducted by using Potentiostat model SEP238C where 3.5% NaCl solution was used as corrodent. The corrosion rate of metal matrix composites was lower than that of matrix material Al6061 under the corrosive atmosphere for both un-heat treated and heat treated conditions. 展开更多
关键词 Al6061 Alloy FRIT STIR CASTING POTENTIOSTAT Corrosion Rate (mmpy)
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示证屏中红外多重触控快速标定算法
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作者 李铁柱 朱文华 蔡宝 《计算机与数字工程》 2019年第5期1244-1248,共5页
论文以受抑全内反射(FTIR)技术为核心,针对互动示证屏系统的技术特点,设计并实现了激光多重触控快速标定算法。分析实际应用场景中,不同光线、距离而产生的不同掩膜(MASK)的标定算法和估算方法,系统采用C/C++实现,NURBS曲面拟合,应用结... 论文以受抑全内反射(FTIR)技术为核心,针对互动示证屏系统的技术特点,设计并实现了激光多重触控快速标定算法。分析实际应用场景中,不同光线、距离而产生的不同掩膜(MASK)的标定算法和估算方法,系统采用C/C++实现,NURBS曲面拟合,应用结果表明,论文设计的算法具有较好的实时性、运行效果稳定,用户体验效果良好,达到了系统设计要求。 展开更多
关键词 FRIT 掩膜 标定 曲面拟合
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Nano-sized stationary phase packings retained by single-particle frit for microchip liquid chromatography
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作者 Wangyan Hu Ke Li +2 位作者 Xiangnan Dou Ning Li Xiayan Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第4期486-489,共4页
Modern chromatography is increasingly focused on miniaturization and integration. Compared to conventional liquid chromatography, microfluidic chip liquid chromatography(microchip-LC) has the potential due to its zero... Modern chromatography is increasingly focused on miniaturization and integration. Compared to conventional liquid chromatography, microfluidic chip liquid chromatography(microchip-LC) has the potential due to its zero-dead volume connection and ease of integration. Nano-sized packings have the potential to significantly enhance separation performance in microchip-LC. However, their application has been hindered by packing difficulties. This study presents a method for packing nano-sized silica particles into a microchannel as the stationary phase. The microchip-LC packed column was prepared by combining the weir and the porous silica single-particle as frit to retain the packing particles. A surface tensionbased single-particle picking technique was established to insert porous single-particle frit into glass microchannels. Additionally, we developed a slurry packing method that utilizes air pressure to inject nano-sized packing into the microchannel. Pressure-driven chromatographic separation was performed using this nano-packed column integrated into a glass microchip. The mixture of four PAHs was successfully separated within just 8 min using a 5 mm separation channel length, achieving high theoretical plates(10~6plates/m). Overall, these findings demonstrate the potential of utilizing nano-sized packings for enhancing chromatographic performance in microchip systems. 展开更多
关键词 Nano-size packing Single-particle frit Packed column Microchip LC Chromatographic separation
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基于FRIT框架的制造业国际竞争力评价研究--兼析环境规制的非线性效应 被引量:6
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作者 孙婷 余东华 李捷 《经济问题探索》 CSSCI 北大核心 2017年第9期153-162,共10页
后金融危机时代,制造业对稳定经济增长的积极作用受到各国普遍重视。面对发达国家"再工业化"与发展中国家全球价值链不断攀升的双重挤压,中国制造业是否仍具备竞争优势、竞争力如何变化,成为近年来新的研究热点。通过构建FRI... 后金融危机时代,制造业对稳定经济增长的积极作用受到各国普遍重视。面对发达国家"再工业化"与发展中国家全球价值链不断攀升的双重挤压,中国制造业是否仍具备竞争优势、竞争力如何变化,成为近年来新的研究热点。通过构建FRIT分析框架、借助熵值法的实证研究发现,我国制造业竞争力虽有波动但总体呈上升趋势,东部地区竞争力最强、西部次之、中部地区竞争力略弱但上升势头平稳。就对制造业竞争力的影响因素而言,要素价格与制度贡献最大,技术创新稳中有升,环境规制则是一个短板。因此,为进一步检验环境规制与制造业竞争力是否存在非线性关系,利用面板固定效应模型的实证分析发现,环境治理投入与制造业国际竞争力确实存在显著"U"型关系,验证了"波特假说"的存在性。最后,从合理利用环境规制措施、鼓励技术创新及完善制度环境等方面总结了进一步增强我国制造业竞争力的政策启示。 展开更多
关键词 制造业 国际竞争力 FRIT框架 环境规制
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基于有限脊波变换的图像融合研究 被引量:5
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作者 刘坤 郭雷 +1 位作者 李晖晖 常威威 《光电子.激光》 EI CAS CSCD 北大核心 2007年第11期1382-1385,共4页
将有限脊波变换(FRIT)应用于图像融合能更好地提取图像边缘特征,为融合提取更多的特征信息。基于FRIT的图像融合算法是将图像进行FRIT,在不同的频率域利用融合规则融合有限脊波系数,最后通过重构得到融合图像。通过对多聚焦图像的实验,... 将有限脊波变换(FRIT)应用于图像融合能更好地提取图像边缘特征,为融合提取更多的特征信息。基于FRIT的图像融合算法是将图像进行FRIT,在不同的频率域利用融合规则融合有限脊波系数,最后通过重构得到融合图像。通过对多聚焦图像的实验,对比了基于FRIT的图像融合算法和基于小波变换的融合算法,并对实验结果进行了主观和客观的评价,试验结果表明,基于FRIT的图像融合算法取得了比基于小波变换算法更好的融合结果,是一种有效可行的图像融合算法。 展开更多
关键词 图像融合 有限脊波变换(FRIT) 有限Radon变换(FRAT) 脊波变换
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对称延拓小波变换矩阵用于FRIT去噪 被引量:5
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作者 侯正信 杨爱萍 《光电子.激光》 EI CAS CSCD 北大核心 2007年第5期603-607,共5页
给出了对称延拓方式下有限长信号不需逐级计算而直接得到小波系数的分解矩阵和由这些小波系数重构原信号的重构矩阵的构造方法,并给出了常用的相应于9/7小波的分解矩阵和重构矩阵及其基向量,它们可广泛用于基于小波的图像分块处理中。... 给出了对称延拓方式下有限长信号不需逐级计算而直接得到小波系数的分解矩阵和由这些小波系数重构原信号的重构矩阵的构造方法,并给出了常用的相应于9/7小波的分解矩阵和重构矩阵及其基向量,它们可广泛用于基于小波的图像分块处理中。作为一种应用实例,将构造的小波变换矩阵用于FRIT图像去噪,不仅计算大大简化,而且相对于周期延拓的小波变换而言边界效应明显减少。 展开更多
关键词 小波变换 有限域脊波变换(FRIT) 图像去噪 基向量 边界效应
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基于有限脊波变换的图像内容认证算法 被引量:2
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作者 祝瑞玲 王欣 《光电子.激光》 EI CAS CSCD 北大核心 2009年第8期1087-1091,共5页
在有限脊波变换(FRIT,finite ridgelet transform)域,提出了一种用于图像内容认证的半易损数字水印算法。提取图像在FRIT时产生的均值信息作为图像内容特征,并由它生成认证水印。利用Bayesian最小风险函数估计选择FRIT系数,把认证水印... 在有限脊波变换(FRIT,finite ridgelet transform)域,提出了一种用于图像内容认证的半易损数字水印算法。提取图像在FRIT时产生的均值信息作为图像内容特征,并由它生成认证水印。利用Bayesian最小风险函数估计选择FRIT系数,把认证水印嵌入这些系数。实验结果表明,此算法简便高效,能很好地区分图像内容的恶意篡改和偶然修改,并能确切指出篡改的位置。 展开更多
关键词 有限脊波变换(FRIT) 认证 Bayesian估计 半易损水印
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基于FRIT数据驱动方法的水轮机调节系统优化控制 被引量:1
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作者 陈志盛 聂成翔 +1 位作者 刘雁俊 李勇刚 《水力发电学报》 EI CSCD 北大核心 2014年第2期242-245,共4页
虚拟参考迭代整定(FRIT)是一种新的无模型数据驱动方法,只需闭环系统的一次输入/输出响应数据即可直接整定控制器参数。针对水轮机发电系统,设计了三自由度控制器型水轮机调速器,并利用FRIT方法实现控制器参数的优化整定。仿真结果表明:... 虚拟参考迭代整定(FRIT)是一种新的无模型数据驱动方法,只需闭环系统的一次输入/输出响应数据即可直接整定控制器参数。针对水轮机发电系统,设计了三自由度控制器型水轮机调速器,并利用FRIT方法实现控制器参数的优化整定。仿真结果表明:FRIT算法简单且易于实现,能有效优化整定控制器参数;三自由度控制器可保证水轮机系统对参考模型的良好跟随特性,以及对负荷扰动的快速抑制,效果优于常规PID控制。 展开更多
关键词 自动化技术应用 水轮机优化调节 虚拟迭代参考整定(FRIT) 三自由度(3-DOF)控制
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Energy-based adaptive orthogonal FRIT and its application in image denoising 被引量:1
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作者 LIU YunXia PENG YuHua +1 位作者 QU HuaiJing YIN Yong 《Science in China(Series F)》 2007年第2期212-226,共15页
Efficient representation of linear singularities is discussed in this paper. We analyzed the relationship between the "wrap around" effect and the distribution of FRAT (Finite Radon Transform) coefficients first, ... Efficient representation of linear singularities is discussed in this paper. We analyzed the relationship between the "wrap around" effect and the distribution of FRAT (Finite Radon Transform) coefficients first, and then based on study of some properties of the columnwisely FRAT reconstruction procedure, we proposed an energy-based adaptive orthogonal FRIT scheme (EFRIT). Experiments using nonlinear approximation show its superiority in energy concentration over both Discrete Wavelet Transform (DWT) and Finite Ridgelet Transform (FRIT). Furthermore, we have modeled the denoising problem and proposed a novel threshold selecting method. Experiments carried out on images containing strong linear singularities and texture components with varying levels of addictive white Gaussian noise show that our method achieves prominent improvement in terms of both SNR and visual quality as compared with that of DWT and FRIT. 展开更多
关键词 orthogonal transform FRIT image denoising THRESHOLD
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Particulate capillary precolumns with double-end polymer monolithic frits for on-line peptide trapping and preconcentration
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作者 Si-Min Xia Hui-Ming Yuan +2 位作者 Zheng Liang Li-Hua Zhang Yu-Kui Zhang 《Chinese Chemical Letters》 SCIE CAS CSCD 2015年第9期1068-1072,共5页
In this work,a novel kind of particulate capillary precolumns with double-end polymer monolithic frits has been developed.Firstly,the polymer monolithic frit at one end was prepared via photo-initiated polymerization ... In this work,a novel kind of particulate capillary precolumns with double-end polymer monolithic frits has been developed.Firstly,the polymer monolithic frit at one end was prepared via photo-initiated polymerization of a mixture of lauryl methacrylate and ethyleneglycol dimethacrylate with 1-propanol and 1,4-butanediol as porogens and 2,2-dimethoxy-2-phenylacetophenone as a photo-initiator in UV transparent coating capillary(100 μm i.d.).Subsequently,C18 particles(5 μm,100 A) were packed into the capillary,and sealed with the polymer monolithic frit at another end.To prevent the reaction of monomers and C18 particles,the packed C18 particles were masked during UV exposure.The loading capacity of such a precolumn was determined to be about 9 μg by frontal analysis with a synthetic peptide APGDR1 YVHPF as a model sample.Furthermore,two parallel precolumns were incorporated into a two-dimensional nano-liquid chromatography(2D nano-LC) system with dual capillary trap columns for peptide trapping and concentration.Compared to 2D nano-LC system with a single trap column,such two dimensional separations could be operated simultaneously to improve the analysis throughput.All these results demonstrated that such capillary precolumns with double frits would be promising for high-throughput proteome analysis. 展开更多
关键词 Capillary precolumn Double-end frits Peptide trapping 2D nano-LC
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