检索结果-南通市图书馆

Theoretical and experimental assessment of a novel method to establish the complete measurement range of the calorimeter and its limit of detection and quantification

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第4期35卷 466-473页

作者： Vesna Krstic af005 Mining and Metallurgy Institute Bor Zeleni Bulevar 3519210 BorSerbia af010.University of Belgrade Technical Faculty BorVJ 1219210 BorRepublik of Serbia

For determining the accuracy of a calorimeter over the instrument’s entire measuring range,a novel method has been established.For this new approach,(a)benzoic acid(C_(6)H_(5)CO_(2)H) as a certified reference material(CRM),(b)SiO_(2) and(c)a mixture of CRM benzoic acid and SiO_(2) have been used.To illustrate the essential difference between 1)the novel analytical method for control of the entire measurement range and 2)the calorimeter calibration,both applications of benzoic acid(BA)have been demonstrated.An experimental result showed that BA was successfully used to check the whole calorimeter measurement range.The results also showed that the same new method was successfully applied to determine the limit of detection and quantification.A new instrument testing process and a new measurement technique have thus been established.In this way,the cost of using CRM to control the accuracy of measuring the entire measuring range of the calorimeter,as shown in this paper,is minimized.The requirements of the ISO/IEC 17025:2017 standard are satisfied.ISO/IEC 17025:2017,together with ISO 9001:2015(quality management systems),ISO 14001:2015(relate to environmental protection)and ISO45001:2018(occupational safety),constitute an integrated quality system by which a testing laboratory may also accredit.

关键词： Benzoic acid Certified reference material The limit of detection/quantification Measurement range Quality control calorimeter Environmental protection

Comparison of Proton Shower Developments in the BGO calorimeter of the Dark Matter Particle Explorer between GEANT4 and FLUKA Simulations

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2020年第11期37卷 114-120页

作者：蒋维岳川崔明阳李翔袁强 Francesca Alemanno Paolo Bernardini Giovanni Catanzani 陈占方 Ivan De Mitri 董铁矿 Giacinto Donvito David Francois Droz Piergiorgio Fusco Fabio Gargano 郭东亚 Dimitrios Kyratzis 雷仕俊刘杨 Francesco Loparco 马鹏雄 Giovanni Marsella Mario Nicola Mazziotta 潘旭彭文溪 Antonio Surdo Andrii Tykhonov 魏逸丰余玉洪藏京京张亚鹏张永杰张云龙 Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China Gran Sasso Science Institute(GSSI) Viale F.Crispi 7I-67100L'AquilaItaly Istituto Nazionale di Fisica Nucleare Laboratori Nazionali del Gran SassoVia G.Acitelli 22I-67100AssergiL'AquilaItaly Dipartimento di Matematica e Fisica E.De Giorgi Universitàdel SalentoI-73100 LecceItaly Istituto Nazionale di Fisica Nucleare(INFN)-Sezione di Lecce I-73100 LecceItaly INFN Section of Perugia I-06100 PerugiaItaly University of Perugia I-06100 PerugiaItaly Istituto Nazionale di Fisica Nucleare(INFN)-Sezione di Bari I-70125BariItaly Department of Nuclear and Particle Physics University of GenevaCH-1211Switzerland Dipartimento Interateneo“M.Merlin”dell'Universitàdegli Studi di Bari e del Politecnico di Bari I-70125BariItaly Dipartimento di Fisica e Chimica“E.Segrè” via delle Scienze Edificio 17UniversitàDegli Studi di PalermoI-90128PalermoItaly Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

The DArk Matter Particle Explorer(DAMPE)is a satellite-borne detector for high-energy cosmic rays and y-rays.To fully understand the detector performance and obtain reliable physical results,extensive simulations of the detector are necessary.The simulations are particularly important for the data analysis of cosmic ray nuclei,which relies closely on the hadronic and nuclear interactions of particles in the detector material.Widely adopted simulation softwares include the GEANT4 and FLUKA,both of which have been implemented for the DAMPE simulation tool.Here we describe the simulation tool of DAMPE and compare the results of proton shower properties in the calorimeter from the two simulation softwares.Such a comparison gives an estimate of the most significant uncertainties of our proton spectral analysis.

关键词： material. GEANT4 calorimeter

Energy loss correction for a crystal calorimeter

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2008年第4期32卷 269-274页

作者：何苗王贻芳边渐明曹国富邓子艳何康林黄彬季晓斌李刚李海波李卫东刘春秀刘怀民马秋梅马想冒亚军毛泽普莫晓虎邱进发孙胜森孙永昭王纪科王亮亮文硕频伍灵慧谢宇广杨明尤郑昀俞国威苑长征袁野臧石磊张长春张建勇张令张学尧张瑶郑志鹏朱永生邹佳恒 Institute of High Energy Physics CAS Peking University Hunan University Shandong University

Material effect of inner-detectors on the performances of the BESⅢ Electromagnetic calorimeter （EMC） is investigated. The BESⅢ Time-Of-Flight counters （TOF） have been utilized to improve the energy resolution and detection efficiency for photons after a careful energy calibration. A matching algorithm between TOF and EMC energy deposits is developed, and the effects of beam-related background are discussed. The energy resolution is improved and the photon detection efficiency can be increased by the combined measurement of EMC and TOF detectors.

关键词： BESⅢ calorimeter material effect calibration resolution efficiency

Environmental test of the BGO calorimeter for DArk Matter Particle Explorer

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2016年第11期40卷 120-127页

作者：胡一鸣常进陈灯意郭建华张云龙封常青 Key Laboratory of Dark Matter and Space Astronomy CAS 2010DP173032Nanjing 210008China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China University of Science and Technology of China Hefei 230026China

DArk Matter Particle Explorer （DAMPE） is the first Chinese astronomical satellite, successfully launched on Dec. 17 2015. As the most important payload of DAMPE, the BGO calorimeter contains 308 bismuth germanate crystals, with 616 photomultiplier tubes, one coupled to each end of every crystal. Environmental tests have been carried out to explore the environmental adaptability of the flight model of the BGO calorimeter. In this work we report the results of the vibration tests. During the vibration tests, no visible damage occurred in the mechanical assembly. After random or sinusoidal vibrations, the change of the first order natural frequency of BGO calorimeter during the modal surveys is less than 5%. The shift ratio of Most Probable Value of MIPs changes in cosmic-ray tests axe shown, the mean value of which is about -4%. The comparison of results of cosmic-ray tests before and after the vibration shows no significant change in the performance of the BGO calorimeter. All these results suggest that the calorimeter and its structure have passed through the environment tests successfully.

关键词： detector dark matter calorimeter environmental test

Design studies on the 4π γ-ray calorimeter for the ETF experiment at HIRFL-CSR

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2011年第1期35卷 67-71页

作者：岳珂徐瑚珊孙志宇苏光辉王建松郑川李松林胡正国陈若富肖志刚胡强张雪荧余玉洪陈俊岭 Institute of Modern Physics CAS Graduate University of Chinese Academy of Sciences Department of Physics Tsinghua University

A high detection efficiency calorimeter which is used to detect γ-rays with energies from 1 MeV up to 10 MeV as well as light charged particles has been proposed. Design of the geometry, results of the crystal tests and Monte Carlo simulations are presented in this paper. The simulation results confirm that the calorimeter can obtain high detection efficiency and good energy resolution with the current designed geometry. And the calorimeter is competent for the future External Target Facility （ETF） experiments.

关键词： calorimeter detector design scintillator detector ETF simulation

NATIONAL STANDARD OF HEAT CAPACITY MEASUREMENT OF SOLIDS IN THE RANGE OF 4.2—90K——AN AUTOMATED ADIABATIC calorimeter FROM 25 TO 90K AND MOLAR HEAT CAPACITIES OF α-ALUMINA

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 1991年第5期34卷 560-569页

作者：谭志诚尹安学陈淑霞周立幸李福学蔡明忠张淑珍潘儒文 Dalian Institute of Chemical Physics Academia Sinica Dalian 116012 PRC National Institute of Metrology Beijing 100013 PRC

The construction of an automated adiabatic calorimeter for heat capacity measurement ofsolids in the temperature range of 25- 90K is described in detail. The sample vessel of thecalorimeter has thin radial vanes which make no contact with its inner wall and are distrib-uted evenly, thus greatly improving the internal thermal equilibration of the vessel. Theprecision of temperature control for the adiabatic shields and electrical leads of the calori-metric system are heightened to a great extent by using the high precision ACD- 79 modeladiabatic controller specially developed by us for this purpose. Measurements of the heatcapacities of high purity α-Al2O3, one of the internationally-accepted standard referencematerials, agree with those of the National Bureau of Standards （NBS）, USA within ±0.3%,demonstrating the reliability of this apparatus.

关键词： heat capacity adiabatic calorimeter α-Al2O3 low temperature automatic temperaturc control

A double-parameter theoretical model of the conduction calorimeter

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 1995年第6期38卷 658-667页

作者：刘劲松曾宪诚田安民邓郁 Department of Chemistry Sichuan University Chengdu 610064 China

A double-parameter theoretical model for the conduction calorimeter, in which the delay of sensing has been considered, is suggested, and a simple method for the determination of the parameters of the model is proposed. The experimental results show that on the basis of this model, the phenomenon of thermogram maximum in thermogram reconstruction can be eliminated, and it can be applied to the thermokinetic investigations of faster thermal change processes.

关键词： conduction calorimeter theoretical model thermogram maximum calorimetry thermokinetics.

Heat of Boron Trifluoride–Methanol System Determined by Bunsen Ice calorimeter

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2018年第4期24卷 370-374页

作者： Weijiang Zhang Yace Zhang Yuvaraja Gutha Jiao Xu School of Chemical Engineering and Technology Tianjin University

The complex heat of BF_3 with methanol was measured by utilizing the principle of the Bunsen ice calorimeter. The complex heat of BF_3 –methanol was found to be 49.2 and 58.1 kJ/mol when the molar ratio of BF_3 to methanol was 1:2 and 1:1,respectively. In addition,the complex heat of BF_3 –anisole was also measured to test the apparatus error. The BF_3 –anisole result showed a calorimeter value of 53.1 kJ/mol with a system error of 2.3% as compared with the value reported in the literature. The mechanism of the reaction of BF_3 and methanol was interpreted based on our obtained results. This apparatus is useful and suitable for measuring the heat of other liquid–gas and liquid–liquid reactions.

关键词： Heat of reaction BF 3–methanol BF 3–anisole Bunsen ice calorimeter Gas–liquid system measurement apparatus

Study of backward terahertz radiation from intense picosecond laser–solid interactions using a multichannel calorimeter system

在线全文

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2019年第1期7卷 47-53页

作者： H. Liu G.-Q. Liao Y.-H. Zhang B.-J. Zhu Z. Zhang Y.-T. Li G. G. Scott D. Rusby C. Armstrong E. Zemaityte P. Bradford N. Woolsey P. Huggard P. McKenna D. Neely Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Key Laboratory for Laser Plasmas (MoE) and School of Physics and Astronomy Shanghai Jiao Tong University Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiao Tong University Central Laser Facility Rutherford Appleton Laboratory Department of Physics SUPA University of Strathclyde Department of Physics York Plasma Institute University of York Space Science Department STFC Rutherford Appleton Laboratory

A multichannel calorimeter system is designed and constructed which is capable of delivering single-shot and broadband spectral measurement of terahertz(THz) radiation generated in intense laser–plasma interactions. The generation mechanism of backward THz radiation(BTR) is studied by using the multichannel calorimeter system in an intense picosecond laser–solid interaction experiment. The dependence of the BTR energy and spectrum on laser energy, target thickness and pre-plasma scale length is obtained. These results indicate that coherent transition radiation is responsible for the low-frequency component(3 THz) of BTR.

关键词： multichannel calorimeter backward terahertz radiation generation mechanisms