In steel plants, estimation of the production system characteristic is highly critical to adjust the system parameters for best efficiency. Although the system parameters may be tuned very well, due to the machine and...In steel plants, estimation of the production system characteristic is highly critical to adjust the system parameters for best efficiency. Although the system parameters may be tuned very well, due to the machine and human factors involved in the production line some deficiencies may occur in product. It is important to detect such problems as early as possible. Surface defects and dimensional deviations are the most important quality problems. In this study, it is aimed to develop an approach to measure the dimensions of metal profiles by obtaining images of them. This will be of use in detecting the deviations in dimensions. A platform was introduced to simulate the real-time environment and images were taken from the metal profile using 4 laser light sources. The shape of the material is generated by combining the images taken from different cameras. Real dimensions were obtained by using image processing and mathematical conversion operations on the images. The results obtained with small deviations from the real values showed that this method can be applied in a real-time production line.展开更多
This paper presents the scheme,function and technical specifications of170-325GHz waveband radar cross sec-tion(RCS) measurement system.Some steps are taken to improve the performance of the system,including multileve...This paper presents the scheme,function and technical specifications of170-325GHz waveband radar cross sec-tion(RCS) measurement system.Some steps are taken to improve the performance of the system,including multilevel ampl-i fication and frequency multiplication,low-order harmonic mixing,using external signal generators and intermediary fre-quency(IF) receiver.Considerable dynamic range and other characteristics are obtained with these approaches.Finally,the concrete implementation and experiment of1mm RCS measurement system are described,and feasibility of the system stud-ied in this paper is verified.展开更多
The publisher regrets that some misprints appeared in the formula for the correction factork on page 343.It is reprinted correctly as the following:k=n(1-e<sup>-λ（t<sub>1</sub>-t<sub>0</su...The publisher regrets that some misprints appeared in the formula for the correction factork on page 343.It is reprinted correctly as the following:k=n(1-e<sup>-λ（t<sub>1</sub>-t<sub>0</sub>）/n</sup>)/e<sup>λ（t<sub>1</sub>-t<sub>0</sub>）</sup>-1·(sum from i=1 to n N<sub>ai</sub>e<sup>iλ（l<sub>1</sub>-l<sub>0</sub>）/n</sup>)/sum from i=1 to n N<sub>ai</sub>展开更多
Work face 3312 of coal mining in a colliery was taken as an example in which methane data in a series of locations was analyzed.For the purpose of data analysis, work face 3312 was divided into sections with 20 powere...Work face 3312 of coal mining in a colliery was taken as an example in which methane data in a series of locations was analyzed.For the purpose of data analysis, work face 3312 was divided into sections with 20 powered supports and some measur- ing-points in a section.Through analysis based on the sectional control volume model,the following points are concluded: (1) the location of gob air flow begins flow into coal face in 70 m away from the haulage gallery;(2) in the control volumes No.10 and No.30,the ra- tios of methane intensity from coal face into gob to the methane intensity in the corre- sponding control volume are 30% and 22%;(3) in the control volume No.50 to No.110,the ratios of methane intensity from gob into coal face to the methane intensity in the corre- sponding control volume are 4%,17%,22% and 53%,respectively.展开更多
Revised January 2014 by G.P. Zeller （Fermilab） Neutrino cross sections are an essential ingredient in all neutrino experiments. Interest in neutrino scattering has recently increased due to the need for such informa...Revised January 2014 by G.P. Zeller （Fermilab） Neutrino cross sections are an essential ingredient in all neutrino experiments. Interest in neutrino scattering has recently increased due to the need for such information in the interpretation of neutrino oscillation data. Historically, neutrino scattering results on both charged current （CC） and neutral current （NC） channels have been collected over many decades using a variety of targets,展开更多
Using data taken at 29 center-of-mass energies between 4.16 and 4.70 GeV with the BESⅢdetector at the Beijing Electron Positron Collider corresponding to a total integrated luminosity of approximately 18.8 fb^(-1),th...Using data taken at 29 center-of-mass energies between 4.16 and 4.70 GeV with the BESⅢdetector at the Beijing Electron Positron Collider corresponding to a total integrated luminosity of approximately 18.8 fb^(-1),the process e^(+)e^(-)→pppñπ+c.c.is observed for the first time with a statistical significance of 11.5σ.The average Born cross sections in the energy ranges of(4.160,4.380)GeV,(4.400,4.600)GeV and(4.610,4.700)GeV are measured to be(21.5±5.7±1.2)fb,(46.3±10.6±2.5)fb and(59.0±9.4±3.2)fb,respectively,where the first uncertainties are statistical and the second are systematic.The line shapes of the pñ and ppπ^(-)invariant mass spectra are consistent with phase space distributions,indicating that no hexaquark or di-baryon state is observed.展开更多
文摘In steel plants, estimation of the production system characteristic is highly critical to adjust the system parameters for best efficiency. Although the system parameters may be tuned very well, due to the machine and human factors involved in the production line some deficiencies may occur in product. It is important to detect such problems as early as possible. Surface defects and dimensional deviations are the most important quality problems. In this study, it is aimed to develop an approach to measure the dimensions of metal profiles by obtaining images of them. This will be of use in detecting the deviations in dimensions. A platform was introduced to simulate the real-time environment and images were taken from the metal profile using 4 laser light sources. The shape of the material is generated by combining the images taken from different cameras. Real dimensions were obtained by using image processing and mathematical conversion operations on the images. The results obtained with small deviations from the real values showed that this method can be applied in a real-time production line.
文摘This paper presents the scheme,function and technical specifications of170-325GHz waveband radar cross sec-tion(RCS) measurement system.Some steps are taken to improve the performance of the system,including multilevel ampl-i fication and frequency multiplication,low-order harmonic mixing,using external signal generators and intermediary fre-quency(IF) receiver.Considerable dynamic range and other characteristics are obtained with these approaches.Finally,the concrete implementation and experiment of1mm RCS measurement system are described,and feasibility of the system stud-ied in this paper is verified.
文摘The publisher regrets that some misprints appeared in the formula for the correction factork on page 343.It is reprinted correctly as the following:k=n(1-e<sup>-λ（t<sub>1</sub>-t<sub>0</sub>）/n</sup>)/e<sup>λ（t<sub>1</sub>-t<sub>0</sub>）</sup>-1·(sum from i=1 to n N<sub>ai</sub>e<sup>iλ（l<sub>1</sub>-l<sub>0</sub>）/n</sup>)/sum from i=1 to n N<sub>ai</sub>
文摘Work face 3312 of coal mining in a colliery was taken as an example in which methane data in a series of locations was analyzed.For the purpose of data analysis, work face 3312 was divided into sections with 20 powered supports and some measur- ing-points in a section.Through analysis based on the sectional control volume model,the following points are concluded: (1) the location of gob air flow begins flow into coal face in 70 m away from the haulage gallery;(2) in the control volumes No.10 and No.30,the ra- tios of methane intensity from coal face into gob to the methane intensity in the corre- sponding control volume are 30% and 22%;(3) in the control volume No.50 to No.110,the ratios of methane intensity from gob into coal face to the methane intensity in the corre- sponding control volume are 4%,17%,22% and 53%,respectively.
文摘Revised January 2014 by G.P. Zeller （Fermilab） Neutrino cross sections are an essential ingredient in all neutrino experiments. Interest in neutrino scattering has recently increased due to the need for such information in the interpretation of neutrino oscillation data. Historically, neutrino scattering results on both charged current （CC） and neutral current （NC） channels have been collected over many decades using a variety of targets,
基金Supported in part by National Key R&D Program of China under Contracts Nos.Supported in part by National Key R&D Program of China(2020YFA0406300,2020YFA0406400)National Natural Science Foundation of China(NSFC)(11975118,11625523,11635010,11735014,11822506,11835012,11935015,11935016,11935018,11961141012,12022510,12025502,12035009,12035013,12061131003,12075252,12192260,12192261,12192262,12192263,12192264,12192265)+19 种基金the Natural Science Foundation of Hunan Province of China(2019JJ30019)the Science and Technology Innovation Program of Hunan Province(2020RC3054)the Chinese Academy of Sciences(CAS)Large-Scale Scientific Facility ProgramJoint Large-Scale Scientific Facility Funds of the NSFC and CAS(U1732263,U1832207)CAS Key Research Program of Frontier Sciences(QYZDJ-SSW-SLH040)100 Talents Program of CASINPAC and Shanghai Key Laboratory for Particle Physics and CosmologyERC(758462)European Union Horizon 2020 research and innovation programme under Contract No.Marie Sklodowska-Curie grant agreement(894790)German Research Foundation DFG(43159800)Collaborative Research Center CRC 1044,FOR 2359,GRK 2149Istituto Nazionale di Fisica Nucleare,ItalyMinistry of Development of Turkey(DPT2006K-120470)National Science and Technology fundOlle Engkvist Foundation(200-0605)STFC(United Kingdom)The Knut and Alice Wallenberg Foundation(Sweden)(2016.0157)The Royal Society,UK(DH140054,DH160214)The Swedish Research CouncilU.S.Department of Energy(DE-FG02-05ER41374,DE-SC-0012069)。
文摘Using data taken at 29 center-of-mass energies between 4.16 and 4.70 GeV with the BESⅢdetector at the Beijing Electron Positron Collider corresponding to a total integrated luminosity of approximately 18.8 fb^(-1),the process e^(+)e^(-)→pppñπ+c.c.is observed for the first time with a statistical significance of 11.5σ.The average Born cross sections in the energy ranges of(4.160,4.380)GeV,(4.400,4.600)GeV and(4.610,4.700)GeV are measured to be(21.5±5.7±1.2)fb,(46.3±10.6±2.5)fb and(59.0±9.4±3.2)fb,respectively,where the first uncertainties are statistical and the second are systematic.The line shapes of the pñ and ppπ^(-)invariant mass spectra are consistent with phase space distributions,indicating that no hexaquark or di-baryon state is observed.
