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Innovative coaxial high-temperature thin-film sensor with core-shell structure surpassing traditional multilayer films

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Rare Metals 2024年第8期43卷 3854-3867页

作者： Chao Wu Guo-Chun Chen Fu-Xin Zhao Fan Lin Ying-Jun Zeng Yan-Zhang Fu Yan-Song Zhang Li-Da Xu Qin-Nan Chen Rui Tang Dao-Heng Sun zhen.Yin Hai pen.Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China AECC Shenyang Engine Institute Shenyang 110015China School of Aerospace Engineering Xiamen UniversityXiamen 361005China

High-temperature thin-film sensors(TFSs)often suffer from inadequate tolerance to elevated *** this study,an innovative approach is presented to fabricate in situ integrated TFSs with a core-shell structure on alloy components using coaxial multi-ink printing *** method replaces traditional layerby-layer(LbL) deposition and LbL sintering processes and achieves simplified one-step *** coaxial TFS includes a conductive Pt core for conducting and sensing and a dielectric shell for electrical isolation and high-temperature *** coaxial Pt resistance grid demonstrates excellent high-temperature stability,with a resistance drift rate of only 0.08%·h^(-1) at 800 ℃,significantly lower than traditional Pt *** employing this method,a Pt thin-film strain gauge(TFSG) is fabricated that boasts remarkable high-temperature electromechanical *** effectively addresses the problem of sensitivity degradation experienced by traditional LbL Pt TFSGs when subjected to high *** demonstrate the system integration potential of the technique by printing and verifying the functionality of a long-path thinfilm resistance grid on turbine blades,which can withstand butane flame up to ~1300℃.These results showcase the potential of core-shell structure of the coaxial TFS for high-temperature applications,providing a novel approach to develop high-performance TFS beyond traditional multilayer structure.

关键词： Coaxial printing Core-shell structure Thinfilm strain gauge High-temperature stability

An Efficient Method of Generating Parameters for Pairing-Based Cryptosystems

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China Communications 2010年第4期7卷 167-171页

作者： WANG Maocai DAI Guangming pen.Lei zhen.Chang QIN Ruijie School of Computer China University of Geosciences Wuhan 430074 China

Efficient computation of Tate pairing is a crucial factor for practical applications of pairing-based cryptosystems(PBC).Recently,there have been many improvements for the computation of Tate pairing,which focuses on the arithmetical operations above the finite *** this paper,we analyze the structure of Miller’s algorithm firstly,which is used to implement Tate *** on the characteristics that Miller’s algorithm will be improved tremendous if the order of the subgroup of elliptic curve group is low hamming prime,a new method for generating parameters for PBC is put forward,which enable it feasible that there is certain some subgroup of low hamming prime order in the elliptic curve group ***,we analyze the computation efficiency of Tate pairing using the new parameters for PBC and give the test *** is clear that the computation of Tate pairing above the elliptic curve group generating by our method can be improved tremendously.

关键词： Pairing-based Cryptosystems Miller's Algorithm Tate Pairing Low Hamming Elliptic Curve

养老保险省级统筹对养老保险基金平衡的影响研究

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南方经济 2024年第1期 22-38页

作者：苏春红耿嫚嫚李真山东大学经济学院山东大学国家治理研究院 250100

提高基本养老保险统筹层次是增强养老金支付能力的重要改革举措,也是实现养老金制度安全规范发展的关键。文章基于养老保险省级统筹改革的准自然实验,利用2008-2019年中国A股上市公司数据,构建双重差分模型实证评估了养老保险统筹改革... 详细信息

提高基本养老保险统筹层次是增强养老金支付能力的重要改革举措,也是实现养老金制度安全规范发展的关键。文章基于养老保险省级统筹改革的准自然实验,利用2008-2019年中国A股上市公司数据,构建双重差分模型实证评估了养老保险统筹改革对企业实际缴费率及基本养老保险基金平衡的影响。研究发现:省级统筹显著降低了企业养老保险实际缴费率,该结果在更改变量度量方式、排除竞争性解释、考虑异质性处理效应等一系列稳健性检验中仍然成立。养老保险省级统筹在不同征管模式、企业类型及地区层面对企业养老保险实际缴费率存在异质性影响,对于社保征收和税务代征模式、劳动密集度高的企业、所在地区老龄化程度低和财政压力小的企业影响更明显。机制分析发现,市县政府由于“相对剥夺效应”和“逐底竞争效应”所产生的征管强度不足是造成省级统筹改革后企业缴费率下降的重要因素。进一步分析表明,省级统筹改革降低了基金收支平衡,并对中西部省份影响更明显。研究对于加强地方政府征管治理、促进养老保险基金平衡发展具有重要启示,为征管主体间利益关系的平衡及养老保险全国统筹的顺利推进提供了经验证据。

关键词：养老保险统筹征管强度实际缴费率基金平衡

激光溅射电离飞行时间质谱快速定量分析钛合金中的氢

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质谱学报 2024年第4期45卷 457-464,I0001页

作者：洪周怡张振建王煜兵徐周毅郭伟杭纬厦门大学化学化工学院谱学分析与仪器教育部重点实验室福建厦门361005 厦门大学萨本栋微米纳米科学技术研究院福建厦门361102 中国地质大学生物地质与环境地质国家重点实验室湖北武汉430078

本研究使用自行搭建的激光溅射电离飞行时间质谱(LAI-TOF MS)对钛合金标准样品进行检测,建立了钛合金中氢的直接定量分析方法,得到氢元素标准曲线的线性关系良好,线性相关系数0.9913,检出限低至0.0004%,计算得到氢元素的原子化和离子化... 详细信息

本研究使用自行搭建的激光溅射电离飞行时间质谱(LAI-TOF MS)对钛合金标准样品进行检测,建立了钛合金中氢的直接定量分析方法,得到氢元素标准曲线的线性关系良好,线性相关系数0.9913,检出限低至0.0004%,计算得到氢元素的原子化和离子化效率约为13.4%。将该方法应用于其他钛合金样品中氢元素的分析,氢测定值相对标准偏差(RSDs)均小于14%;将该测定结果与惰性气体熔融-红外法测定值进行对比,相对误差均在5%以内。同时,通过分析LAI-TOF MS谱图,可实现钛合金样品中Be、C、Al、Si、P、Ca、Cr、Fe、Zr、Mo、Pd、In、Sn等微量元素的定性和半定量检测。结果表明,基于LAI-TOF MS建立的钛合金中氢定量检测方法几乎无需样品前处理、操作简便、分析时间短、灵敏度高,可用于钛合金中氢元素的快速直接定量检测。

关键词：钛合金氢定量激光溅射电离飞行时间质谱(LAI-TOF MS) 微量元素半定量分析

基于最优有效度的电力系统可靠性原始参数的线性组合预测模型

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继电器 2007年第6期35卷 30-33,67页

作者：王遂任震华南理工大学电力学院广东广州510640

针对电力系统可靠性原始参数缺乏和开发可靠性原始参数小样本的需要,提出了电力系统可靠性原始参数的线性组合预测模型。为了提高预测精度,分别应用灰色优化模型和Verhulst模型等改进模型进行可靠性原始参数的预测。与此同时,建立以有... 详细信息

针对电力系统可靠性原始参数缺乏和开发可靠性原始参数小样本的需要,提出了电力系统可靠性原始参数的线性组合预测模型。为了提高预测精度,分别应用灰色优化模型和Verhulst模型等改进模型进行可靠性原始参数的预测。与此同时,建立以有效度为目标函数的最优组合预测模型,并用简化的计算公式得到权系数的最优近似解,将预测值进行线性组合。基于该文所开发的预测模型的预测结果表明,组合预测模型的预测结果优于单一模型的预测结果。

关键词：可靠性原始参数最优有效度线性组合预测模型电力系统

An examination of handwritten signatures forged using photosensitive signature stamp

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Forensic Sciences Research 2021年第2期6卷 168-182页

作者： zhen.Li Xinlai Liu Department of Documents examination criminal investigation Police University of chinashenyangChina

Signature examination is the most common examination performed by any document *** of the authenticity of a handwritten signature on a questioned document is an important task for forensic document examiners in the forensic science *** a result of continuous developments in technology,a signature stamp can now be created using a photosensitive seal to enable the reproduction of a handwritten *** stamps are commonly used in China and several other *** this study,10 types of black photosensitive stamp-pad ink,10 brands of fountain pen.ink,15 types of black gel ink and six types of black erasable gel ink found on the Chinese domestic market were collected and 10 photosensitive signature stamps were created using the signatures of 10 *** analysis,infrared(IR)and fluorescence analyses and microspectrophotometry(MSP)techniques were used to examine the resulting photosensitive signature stamp impressions when applied to printing papers,writing papers and invoice *** comparing the printing and spectral characteristics of the photosensitive signature stamp impressions with those of the signatures executed using the fountain pen.,gel pen. and erasable gel pen.,it was possible to determine whether each signature was written or stamped using a photosensitive signature *** validate these results,a 96.7%absolute accuracy and a 99.3%detection rate were achieved over a total of 150 blind tests conducted by five forensic document examiners,thus demonstrating that a combination of the four analysis methods used in this work can provide a more scientific approach and improve the accuracy and the detection rate of the examination process.

关键词： Forensic sciences questioned document forensic document examination signature examination photosensitive stamp microspectrophotometry IR analysis fluorescence analysis

石灰性潮土上三种磷肥的肥效、后效及增施磷肥的效果

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土壤通报 2010年第2期41卷 367-372页

作者：王少仁夏培桢中国农业科学院资源区划所北京100081

3种不同性质磷肥在石灰性潮土上的用量定位试验,明确了其肥效、后效、残磷后效和增施磷肥效果之间的相互关系。同时还明确了增磷与残磷增产量之间的比值变化规律。还从该大差额磷肥用量的试验结果中,总结出对"作物施磷"、"土壤施磷"和"... 详细信息

3种不同性质磷肥在石灰性潮土上的用量定位试验,明确了其肥效、后效、残磷后效和增施磷肥效果之间的相互关系。同时还明确了增磷与残磷增产量之间的比值变化规律。还从该大差额磷肥用量的试验结果中,总结出对"作物施磷"、"土壤施磷"和"储备施磷"的概念及量的界定,并对其进行了评价。通过此试验还发现,在石灰性潮土上使用强碱性的钙镁磷肥时对土壤酸碱度和作物产量的不良影响。

关键词：石灰性潮土磷肥肥效后效

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我国国家主权财富基金运营的困难与对策分析

中国流通经济 2009年第10期23卷 73-76页

作者：任熹真刘永芝哈尔滨工业大学黑龙江哈尔滨150001

国家主权财富基金是许多国家积极推崇的投资工具,我国国家主权财富基金成立后在股权、债权、资本金运营方面取得了一定的进展,但同时存在着法律监管缺位、定位模糊、市场化程度低和投资区域结构不合理等方面的缺陷。为此,应尽快制定一... 详细信息

国家主权财富基金是许多国家积极推崇的投资工具,我国国家主权财富基金成立后在股权、债权、资本金运营方面取得了一定的进展,但同时存在着法律监管缺位、定位模糊、市场化程度低和投资区域结构不合理等方面的缺陷。为此,应尽快制定一整套切实可行的法律制度,加强对国家主权财富基金的内部和外部监督;完善投资程序,建立合理的绩效评估体系,适当提高透明度;以市场化、商业化的标准约束其行为,尽可能降低政府的影响;建立主权财富基金的风险防范体系,降低投资的风险,提高我国国家主权财富基金的运营效率。

关键词：国家主权财富基金投资运营对策

Efficient photoelectrodes based on two-dimensional transition metal dichalcogenides heterostructures:from design to construction

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Rare Metals 2022年第4期41卷 1142-1159页

作者： Xiang-Chao Lu Yi-zhen.Lu Cong Wang Yang Cao State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China pen.Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China

Hydrogen production by photoelectrochemical(PEC) water splitting converts the inexhaustible supply of solar radiation to storable H2 as clean energy and thus has received widespread *** efficiency of PEC water splitting is largely determined by the properties of the ***-dimensional(2 D) layered transition metal dichalcogenides(TMDs) are promising candidates for photoelectrodes due to their atomic layer thickness,tunable bandgap,large specific surface area,and high carrier ***,the construction of 2 D TMDs heterostructures provides freedom in material design,which facilitates the further improvement of PEC water *** review begins by describing the mechanism of PEC water splitting and the advantages of 2 D TMDbased heterostructures for photo ***,the design considerations of the heterostructures for enhanced PEC efficiency are comprehensively reviewed with a focus on material selection,band engineering,surface modification,and long-term ***,current challenges and future perspectives for the development of photoelectrodes based on 2 D TMDs heterostructures are addressed.

关键词： Two-dimensional transition metal van der Waals heterostructure Photoelectrode Photoelectrochemical cell Water splitting