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A novel ice slurry producing system with vacuum freezing

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Journal of Central South University 2017年第3期24卷 736-742页

作者： tang yi-fang School of Energy Science and Engineering Central South University Changsha 410083 China Collaborative Innovation Center of Building Energy Conservation & Environmental Control Zhuzhou 412007 China

A novel vacuum ice slurry producing system with jet-pumps was proposed to deal with the problems of high energy consumption and ice *** this novel system,one steam driven by a jet-pump was used to create vacuum in a hermetic vessel where water was sprayed through a nozzle to produce ice slurry,while the other steam was used to provide enough cold energy to make the left vapor in the hermetic vessel *** models of this novel system were established and theoretical simulation on the performance characteristics was also implemented based on the MATLAB *** show that the novel system is feasible and practicable,and the system performance is affected by many factors,such as the temperature of the generators,condensing temperature,evaporation temperature,and the cooling load of the refrigerator *** findings are helpful to improve the performance of ice slurry producing system.

关键词： ice slurry vacuum freezing ejector solar energy

A novel method for extracting and optimizing the complex permittivity of paper-based composites based on an artificial neural network model

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Science China(Technological Sciences) 2024年第10期67卷 3190-3204页

作者： XIA ChenBin SHEN Junyi LIAO ShaoWei WANG yi HUANG ZhengSheng XUE Quan tang min LONG Jin HU Jian School of Light Industry and Engineering South China University of TechnologyGuangzhou 510641China School of Electronic and Information Engineering South China University of TechnologyGuangzhou 510641China

Measuring the complex permittivity of ultrathin,flexible materials with a high loss tangent poses a substantial challenge with precision using conventional methods,and verifying the accuracy of test results remains *** this study,we introduce a methodology based on a back-propagation artificial neural network(ANN)to extract the complex permittivity of paper-based composites(PBCs).PBCs are ultrathin and flexible materials exhibiting considerable complex permittivity and dielectric loss *** the absence of mature measurement methods for PBCs and a lack of sufficient data for ANN training,a mapping relationship is initially established between the complex permittivity of honeycomb-structured microwave-absorbing materials(HMAMs,composed of PBCs)and that of PBCs using simulated *** the ANN model,the complex permittivity of PBCs can be extracted from that of HMAMs obtained using standard ***,two published methods are cited to illustrate the accuracy and advancement of the results obtained using the proposed ***,specific error analysis is conducted,attributing discrepancies to the conductivity of PBCs,the homogenization of HMAMs,and differences between the simulation model and actual ***,the proposed method is applied to optimize the cell length parameters of HMAMs for enhanced absorption *** conclusion discusses further improvements and areas for extended research.

关键词： paper-based composite honeycomb complex permittivity artificial neural networks inverse modeling

Development of a 50-year daily surface solar radiation dataset over China

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Science China Earth Sciences 2013年第9期56卷 1555-1565页

作者： tang WenJun YANG Kun QIN Jun min min Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of Sciences Graduate School of Chinese Academy of Sciences Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites National Satellite Meteorological CenterChina Meteorological Administration

Although solar radiation is a crucial parameter in designing solar power devices and studying land surface processes,long-term and densely distributed observations of surface solar radiation are usually not *** paper describes the development of a 50-year dataset of daily surface solar radiation at 716 China Meteorological Administration(CMA) ***,a physical model,without any local calibration,is applied to estimate the daily radiation at all 716 CMA routine ***,an ANN-based(Artificial Neural Network) model is applied to extend radiation estimates to earlier periods at each of all 96 CMA radiation *** ANN-based model is trained with recent reliable radiation data and thus its estimate is more reliable than the physical ***,the ANN-based model is used to correct the physical model dynamically at a monthly *** correction generally improves the accuracy of the radiation dataset estimated by the physical model:the mean bias error(MBE) averaged over all the 96 radiation stations during 1994-2002 is reduced from 0.68 to 0.11 MJ m-2 and the root mean square error(RMSE) from 2.01 to 1.80 MJ *** new radiation dataset shows superior performance over previous estimates by locally calibrated ngstr m-Prescott *** on the new radiation dataset,the annual mean daily solar radiation over China is 14.3 MJ *** maximal seasonal mean daily solar radiation occurs in the Tibetan Plateau during summer with a value of 27.1 MJ m-2,whereas the minimal seasonal mean daily solar radiation occurs in the Sichuan Basin during winter with a value of 4.7 MJ m-2.

关键词： Development of a 50-year daily surface solar radiation dataset over China

Dilemmas in diagnosis and management of hemophagocytic lymphohistiocytosis in children

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World Journal of Pediatrics 2020年第4期16卷 333-340页

作者： Xiao-Jun Xu Yong-min tang Division of Hematology-Oncology Children’s HospitalZhejiang University School of MedicineKey Laboratory of Reproductive Genetics of Ministry of EducationZhejiang UniversityHangzhou310003China

Background Hemophagocytic lymphohistiocytosis(HLH)is a life-threatening entity which is characterized by severe *** the HLH-2004 protocol has been widely accepted and clinically used;however,many questions still remain in clinical *** this review,we discuss the dilemmas in the diagnosis and treatment of HLH in *** sources Original research for articles and literature reviews published in PubMed was carried out using the key term“hemophagocytic lymphohistiocytosis”.Results As the gene sequencing technology progresses,the range of causal mutations and primary HLH has been *** monoallelic variants may contribute to the pathogenesis of the *** conditions without defective cytotoxicity of T or NK cells may lead to HLH,such as primary immunodeficiency(PID)and dysregulated immune activation or proliferation(DIAP).HLH shares overlapping clinical and laboratory characteristics with severe sepsis,but usually the single values are more pronounced in HLH than sepsis.H score is another approach to help the diagnosis of secondary *** Th1/Th2 cytokine patterns are very helpful tools to differentiate HLH(reactivation of HLH)from ***,it also has been used successfully to stratify the therapy *** treatment of HLH should consider underlying diseases,triggers and ***-94 is recommended for patients who need etoposide-based *** Dramatic progress has been made during the past decades in understanding the pathophysiology of ***,diagnosis and treatment of HLH remain with many dilemmas because of the heterogeneous nature of the *** understanding new gene defects and more effective diagnostic approaches and salvage regimens are goals for the future.

关键词： Cytokine Hemophagocytic lymphohistiocytosis Sepsis Transplantation

紫外荧光法测定航天煤油硫含量的影响因素研究

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石油炼制与化工 2025年第1期56卷 181-186页

作者：周建臣俞少行唐毅吴奖君西昌卫星发射中心海南文昌571300 航天发射场可靠性技术重点实验室

系统地研究了紫外荧光法各参数对航天煤油硫含量测试结果的影响,分析了硫信号积分值随进样速率、进样量、负高压、裂解氧流量、氩气流量、进口氧流量和裂解温度的变化规律,得到了最佳测试条件。结果表明:进样速率、裂解氧流量、氩气流... 详细信息

系统地研究了紫外荧光法各参数对航天煤油硫含量测试结果的影响,分析了硫信号积分值随进样速率、进样量、负高压、裂解氧流量、氩气流量、进口氧流量和裂解温度的变化规律,得到了最佳测试条件。结果表明:进样速率、裂解氧流量、氩气流量、负高压是紫外荧光法精确测定硫含量的主要影响因素;最佳进样速率和最佳氩气流量会受航天煤油热裂解反应的影响,最佳裂解氧流量与进样速率有关,负高压范围由基线噪声情况确定,最佳进样量可根据负高压对最小进样量的影响来确定。本研究为紫外荧光法准确、高效地测定航天煤油硫含量提供了测试参数参考,也给探究最佳测试条件提供了试验方法。

关键词：航天煤油硫含量紫外荧光法热裂解

An Operational Precipitable Water Vapor Retrieval Algorithm for Fengyun-2F/VISSR Using a Modified Three-Band Physical Split-Window Method

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Journal of Meteorological Research 2019年第2期33卷 276-288页

作者： Juyang HU Shihao tang Hailei LIU min min Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites National Satellite Meteorological Center China Meteorological Administration Key Laboratory of Atmospheric Sounding Chengdu University of Information Technology

The Visible and Infrared Spin-Scan Radiometer(VISSR) onboard the Fengyun-2(FY-2) satellite can provide valuable thermal infrared observations to help create a precipitable water vapor(PWV) product with high spatial and temporal resolutions. The current FY-2/VISSR PWV product in operation is produced by using a traditional two-band physical split-window(PSW) method, which produces low quality results under dry atmospheric conditions. Based on the sensitivity characteristics of FY-2 F/VISSR water vapor channel and two split-window channels to atmospheric water vapor, this study developed a new, robust operational PWV retrieval algorithm for FY-2 F to improve the operational precision of the current PWV product. The algorithm uses a modified three-band PSW method, which adds a scale for the water vapor channel in the improved three-band PSW method. Integrated PWV products from the radiosonde data in 2016 are used here to validate the precision of the PWV retrieved by the modified three-band and traditional two-band PSW methods. The mean bias, root mean square error(RMSE), and correlation coefficient of the PWV retrieved by the modified three-band PSW method are 0.28 mm, 4.53 mm, and 0.969, respectively. The accuracy is much better than the PWV retrieved by the two-band method, whose mean bias, RMSE, and correlation coefficient are 12.67 mm, 29.35 mm, and 0.23. Especially, in mid-or high-latitude regions, the RMSE of the PWV is improved from 10 to 2 mm by changing the inversion in the two-band method to the modified three-band PSW method. Furthermore, the modified three-band PSW results show a better consistency with the radiosonde PWV at any zonal belt and season than the two-band PSW results. This new algorithm could significantly improve the quality of the current FY-2 F/VISSR PWV product, especially at sites where the actual PWV are lower than 15 mm.

关键词： physical split-window (PSW) method precipitable water vapor (PWV) FY-2F/VISSR thermal infrared

Derivations of the Positive Part of the Two-parameter Quantum Group of Type G_(2)

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Acta Mathematica Sinica,English Series 2021年第9期37卷 1471-1484页

作者： Yong Yue ZHONG Xiao min tang School of Mathematical Sciences Harbin Engineering UniversityHarbin 150001P.R.China. School of Mathematical Sciences Heilongjiang UniversityHarbin 150080P.R.China

In this paper,we compute the derivations of the positive part of the two-parameter quantum group of type G_(2) by embedding it into a quantum *** also show that the first Hochschild cohomology group of this algebra is... 详细信息

关键词： Two-parameter quantum group derivation Hochschild cohomology group

Distribution and ecological effect of mercury in Laogang landfill,Shanghai,China

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Journal of Environmental Sciences 2007年第2期19卷 200-204页

作者： DING Zhen-hua tang Qing-he LIU Cai-e WANG Wen-hua ZHUANG min LIN yi-ming School of Life Sciences Xiamen University Xiamen 361005 China Key Laboratory of Industrial Biotechnology MEC Jiangnan University Wuxi 214036 China School of Environmental Science and Engineering Shanghai Jiaotong University Shanghai 200240 China College of Oceanography and Environmental Science Xiamen University Xiamen 361005 China

Laogang landfill near Shanghai is the largest landfill in China, and receives about 10000 t of daily garbage per day, Samples of topsoil and plants were analyzed to evaluate mercury pollution from the landfill. For topsoil samples, there were significant correlations among total mercury （HgT）, combinative mercury （Hgc） and gaseous mercury （HgG）, and content of total organic carbon （TOC）, but, no significantly relationship was found between Hg content and filling time. Hg content changes in vertical profiles with time showed that the average Hgv of profiles 1992, 1996, and 2000 was similar, but their average HgG was quite different. HgT was significantly correlated with Hgc in profile 1992 and 2000, and Hgv was significantly correlated with Hg6 in profile 1996. HgG/Hgv ratio in profile samples decreased in the order of （HgG,/HgT）1992〉（HgG/HgT）1996〉〉（HgG/HgT）2000. A simple outline of Hg release in landfill could be drawn： with increasing of filling time, degradation undergoes different biodegradation, accordingly, gaseous mercury goes through small, more, and small proportion to total mercury. Distribution of Hg in plants was inhomogeneous, following the order of leaf〉root〉stem. The highest value of leaf may be associated with higher atmospheric Hg from landfill. Ligneous plants （e.g. Phyllostachys glanca, Prunus salicina and Ligustrum lucidum） are capable of enriching more Hg than herbaceous plants.

关键词： mercury landfill distribution plant topsoil

Field validation of the GLASS land surface broadband emissivitydatabase using pseudo-invariant sand dune sites in northern China

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International Journal of Digital Earth 2013年第S01期6卷 96-112页

作者： Lixin Dong Juyang Hu Shihao tang min min Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites National Satellite Meteorological CenterBeijingChina

The land surface broadband emissivity (LSBE) is a key parameter for estimatingsurface radiation, and there have been many studies of the LSBE at global orlocal scales. However, few studies have validated the surface emissivity databasewith multi-point field measurement data using infrared radiometry, especially inChina. In this study, we focus on the validation of the emissivity product of theglobal land surface satellite (GLASS) LSBE database for northern China for theperiod from 2006 to 2011. Specifically, we have employed an eight-day averaged,gridded emissivity product in the 813.5 mm spectral range produced at a spatialresolution of 1000 m from the Moderate Resolution Imaging Spectrometeralbedo product using a new algorithm. The GLASS LSBE database was validatedover bare surfaces with field measurement data from sand samples collected atmany pseudo-invariant sand dune sites located in western and northwesternChina. By comparing measured emissivity for different land surface types atdifferent sites and different times, it was shown that the results were consistentand that the accuracy of the field measurements was reliable. The results of thevalidation of GLASS LSBE with these field emissivity data showed very goodagreement.

关键词： validation broadband emissivity field measurement emissivity GLASS northern China