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广东某地食用农产品快速检测实验室监督评价与分析

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实验室检测

实验室检测 2024年第9期2卷 122-126页

作者：苏焕斌冯观萍黄钟标符嘉诚梁祖培广东产品质量监督检验研究院阳江技师学院

目的监督评价食用农产品快速检测实验室，检验当地快速检测工作落实情况。方法在广东省市场监督管理局相关评价细则的基础上，结合政府快速检测实验室运营管理相关要求，从实验室场地、快速检测制度建立、完成情况、抽样情况、原始记... 详细信息

目的监督评价食用农产品快速检测实验室，检验当地快速检测工作落实情况。方法在广东省市场监督管理局相关评价细则的基础上，结合政府快速检测实验室运营管理相关要求，从实验室场地、快速检测制度建立、完成情况、抽样情况、原始记录、后续处理、快速检测操作、快速检测产品及设备管理等环节对快速检测实验室进行全面评价。结果本次对12家食用农产品政府快速检测实验室进行监督评价，综合得分均在89分以上。每个政府快速检测实验室考核6个盲样，只有E政府快速检测实验室盲样考核准确率未达到100%，监督评价结果较为理想。结论当地食用农产品快速检测实验室在发挥快速检测筛查的“防火墙”方面取得一定的成效，但仍存在一定的问题及风险点，建议从人员培训、原始记录、快速检测产品与设备管理、快速检测质量控制、监督考核等方面入手，推动快速检测实验室检测能力不断提升。

关键词：食品安全食用农产品快速检测实验室监督评价

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创新是技术转移推动经济发展的第一要素

研究与发展管理 2022年第4期34卷 17-20页

作者：冯冠平清华大学北京100084

很多人说我的人生跨度之大让人称奇。50岁之前在清华园,从当年清华大学最年轻的教授到科技处处长、校长助理;50岁之后在深圳湾,担任深圳清华大学研究院创始院长,开启科技成果转化和创业投资的探索之路,2020年深圳经济特区建立40周年之际... 详细信息

很多人说我的人生跨度之大让人称奇。50岁之前在清华园,从当年清华大学最年轻的教授到科技处处长、校长助理;50岁之后在深圳湾,担任深圳清华大学研究院创始院长,开启科技成果转化和创业投资的探索之路,2020年深圳经济特区建立40周年之际,被评为创业创新人物和先进模范人物。来深圳20多年,我的个人经历和实践可以总结为“成功的奥秘就是大胆创新”。

关键词：科技成果转化创业创新校长助理深圳经济特区科技处处长推动经济发展深圳湾创业投资

Comparative transcriptomic evidence of physiological changes and potential relationships in vertebrates under different dormancy states

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Zoological Research 2024年第2期45卷 341-354页

作者： Yu-Han Niu Li-Hong guan Cheng Wang Hai-feng Jiang Guo-Gang Li Lian-Dong Yang Shun-ping He State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhanHubei 430072China College of Life Sciences Qinghai Normal UniversityXiningQinghai 810008China Academy of Plateau Science and Sustainability Qinghai Normal UniversityXiningQinghai 810016China Key Laboratory of Biodiversity Formation Mechanism and Comprehensive Utilization of the Qinghai-Tibet Plateau in Qinghai Province Qinghai Normal UniversityXiningQinghai 810008China College of Life Sciences and Technology Xinxiang Medical UniversityXinxiangHenan 453003China College of Animal Science and Technology Northwest A&F UniversityYanglingShaanxi 712100China

Dormancy represents a fascinating adaptive strategy for organisms to survive in unforgiving *** a period of dormancy,organisms often exhibit exceptional *** period is typically divided into hibernation and aestivation based on seasonal ***,the mechanisms by which organisms adapt to their environments during dormancy,as well as the potential relationships between different states of dormancy,deserve further ***,we selected Perccottus glenii and Protopterus annectens as the primary subjects to study hibernation and aestivation,*** on histological and transcriptomic analysis of multiple organs,we discovered that dormancy involved a coordinated functional response across *** analyses revealed noteworthy disparities between the two dormant species in their responses to extreme ***,similarities in gene expression patterns pertaining to energy metabolism,neural activity,and biosynthesis were noted during hibernation,suggesting a potential correlation between hibernation and *** further explore the relationship between these two phenomena,we analyzed other dormancy-capable species using data from publicly available *** comparative analysis revealed that most orthologous genes involved in metabolism,cell proliferation,and neural function exhibited consistent expression patterns during dormancy,indicating that the observed similarity between hibernation and aestivation may be attributable to convergent *** conclusion,this study enhances our comprehension of the dormancy phenomenon and offers new insights into the molecular mechanisms underpinning vertebrate dormancy.

关键词： Hibernation Aestivation Multi-organs Convergent evolution

Regulated polarization degree of upconversion luminescence and multiple anti-counterfeit applications

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Rare Metals 2024年第5期43卷 2172-2183页

作者： Dong-ping Wen ping Chen Yi Liang Xiao-Ming Mo Cao-feng Pan Center On Nanoenergy Research Guangxi Key Laboratory for Relativistic AstrophysicsSchool of Physical Science and TechnologyGuangxi UniversityNanning 530004China Key Laboratory of Micronano Energy and Sensor CAS Center for Excellence in NanoscienceBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100140China

Polarization upconversion luminescence(PUCL)of lanthanide ions(Ln^(3+))has been widely used in single particle tracking,microfluidics detection,three-dimensional displays,and so ***,no effective strategy has been developed for modulating *** we report a strategy to regulate PUCL in Ho^(3+)-doped NaYF4single nanorods based on the number of upconversion *** constructing a multiphoton upconversion system for Ho^(3+),we regulate the degree of polarization(DOP)of PUCL from 0.590 for two-photon luminescence to 0.929 for three-photon upconversion luminescence(UCL).Furthermore,our strategy is verified from cross-relaxation between Ho^(3+)and Yb^(3+),excitation wavelength,excitation power density,and local site *** this regulation strategy of PUCL has also been achieved in Tm^(3+),with the DOP ranging from 0.233 for two-photon luminescence to 0.925 for four-photon UCL Besides,multi-dimensional anti-counterfeiting display has been explored with *** work provides an effective strategy for regulating PUCL and also provides more opportunities for the development of polarization display optical encoding,anti-counterfeiting,and integrated optical devices.

关键词： Polarization upconversion luminescence Degree of polarization Population density of excited state Number of upconversion photons Polarization anti-counterfeitingdisplay

High-current pulsed electron beam modification on microstructure and performance of Cu/CuW diffusion bonding joints

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Rare Metals 2024年第6期43卷 2819-2831页

作者： Na-Na Tian Cong-Lin Zhang Peng Lyu Jin-Tong guan Jie Cai Qing-feng guan Shun Guo School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China School of Material Science and Engineering Yancheng Institute of TechnologyYancheng 221051China Engineering Institute of Advanced Manufacturing and Modern Equipment Technology Jiangsu UniversityZhenjiang 212013China

This study investigates the influence of high-current pulsed electron beam(HCPEB)modification on the microstructure and shear strength of Cu/CuW *** solid-state diffusion bonding of modified-Cu(MCu)and modified-CuW(M-CuW)was achieved by HCPEB modification pretreatment at a temperature of 800-900℃and a pressure of 5 MPa for 10-50 *** demonstrate that HCPEB modification facilitates the dissolution of W and Cu,resulting in the formation of a Cu_(0.4)W_(0.6)solid solution and thus enhancing the uniform distribution of ***,HCPEB-induced defects play a beneficial role in promoting the diffusion process by providing fast diffusion paths for *** optimal joints with the maximum shear strength of 213.7 MPa were obtained through bonding M-Cu and M-CuW at 900℃and 5 MPa for 30 min,which attributes to the combined effects of fine-grained strengthening and solid solution ***,the application of HCPEB modification showcases its effectiveness in promoting element diffusion and enhancing the mechanical performance of the joints.

关键词： HCPEB Element diffusion Shear strength Crystal defects Surface modification

Multi-layer perceptron-based data-driven multiscale modelling of granular materials with a novel Frobenius norm-based internal variable

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2198-2218页

作者： Mengqi Wang Y.T.feng Shaoheng guan Tongming Qu Zienkiewicz Centre for Computational Engineering Faculty of Science and EngineeringSwansea UniversitySwanseaWalesSA18EPUK Institute of Theoretical and Computational Physics Graz University of TechnologyGraz8010Austria Department of Civil and Environmental Engineering Hong Kong University of Science and TechnologyClearwater BayKowloonHong KongChina

One objective of developing machine learning(ML)-based material models is to integrate them with well-established numerical methods to solve boundary value problems(BVPs).In the family of ML models,recurrent neural networks(RNNs)have been extensively applied to capture history-dependent constitutive responses of granular materials,but these multiple-step-based neural networks are neither sufficiently efficient nor aligned with the standard finite element method(FEM).Single-step-based neural networks like the multi-layer perceptron(MLP)are an alternative to bypass the above issues but have to introduce some internal variables to encode complex loading *** this work,one novel Frobenius norm-based internal variable,together with the Fourier layer and residual architectureenhanced MLP model,is crafted to replicate the history-dependent constitutive features of representative volume element(RVE)for granular *** obtained ML models are then seamlessly embedded into the FEM to solve the BVP of a biaxial compression case and a rigid strip footing *** obtained solutions are comparable to results from the FEM-DEM multiscale modelling but achieve significantly improved *** results demonstrate the applicability of the proposed internal variable in enabling MLP to capture highly nonlinear constitutive responses of granular materials.

关键词： Granular materials History-dependence Multi-layer perceptron(MLP) Discrete element method FEM-DEM Machine learning

How Does Urban Shrinkage Affect Land Use Efficiency?A Case Study of Shrinking Cities in Northeast China

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Chinese Geographical Science 2024年第1期34卷 34-51页

作者： XIE Mingke feng Zhangxian SONG Yang guan Haoming WANG Shijun School of Geographical Sciences Northeast Normal UniversityChangchun130024China

The effect of urban shrinkage has gradually become a new ***,urban shrinkage may exert great influence on land use efficiency(LUE)through various urban subsystems,but there is currently limited research examining these *** the Super-SBM-Undesirable model and the Structural Equation Model(SEM),this study calculates the LUE of shrinking cities in Northeast China and simulates the process of urban shrinkage affecting *** quantify the process of urban shrinkage affecting LUE,three mediation variables,namely the economy,public services,and innovation,are used as latent variables to apply *** results show that urban shrinkage will affect LUE through a direct path and indirect *** the direct path,urban shrinkage leads to an improvement in *** the indirect paths,the economy and innovation will transmit the negative effect of urban shrinkage on LUE,while public services will reverse this *** important contribution of this study is that it quantifies the paths of urban shrinkage affecting LUE,thereby expanding the understanding of urban shrinkage effect and laying a foundation for the sustainable development of shrinking cities.

关键词： urban shrinkage land use efficiency Super-SBM-Undesirable model Structural Equation Model(SEM) Northeast China

Design of the Stripping Foil Exchanger for CYCIAE-100

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Design of the Stripping Foil Exchanger for CYCIAE-100

Design of Coaxial Target for Pulsed Beam Test

作者： XIE Huai-dong AN Shi-zhong guan feng-ping

A 100 MeV H compact cyclotron(CYCIAE-100) is under construction at CIAE,and proton beams of 75-100 MeV will be extracted in dual opposite directions by charge exchange stripping *** stripping foil is one of the most important devices in the stripping extraction,and changing target is critical in all operations. In order to ensure the reliability,a test has been conducted for target changing before machining the whole device.A simple device is machined for the *** order to shorten the machining time and reduce the costs,the cooling and driving systems have been *** test has a good result,which indicates

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Design of Coaxial Target for Pulsed Beam Test