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水泥熟料率值和矿物计算新公式概述 被引量:1
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作者 叶国奎 《四川水泥》 2000年第1期12-14,共3页
1 引言 水泥工艺的基础理论,特别是表示水泥熟料中各氧化物之间相对含量的率值系数,对生产实际具有非常重要的意义。前苏联学者容克和金德的石灰饱和系数KH存在一定的缺陷,其主要原因是基本概念只是定性而不定量化,导致计算表述的不直... 1 引言 水泥工艺的基础理论,特别是表示水泥熟料中各氧化物之间相对含量的率值系数,对生产实际具有非常重要的意义。前苏联学者容克和金德的石灰饱和系数KH存在一定的缺陷,其主要原因是基本概念只是定性而不定量化,导致计算表述的不直观性。在进行矿物组成计算时,引入的硫酸盐碱度概念同样是定性的,同样不能有效地解决这一问题。 展开更多
关键词 水泥熟料 矿物组成 计算公式 氧化物 率值系数
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Experimental and CFD investigations on cooling process of end-quench test 被引量:4
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作者 Pei FU Ping ZHOU +2 位作者 Zi-wei XIE Hong-yu WU Ji-guang CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第11期2440-2446,共7页
The microstructure of an alloy is affected intensively by the cooling process.To figure out the inherent relation between the cooling rate and microstructure of an advanced nickel-based superalloy,experimental and num... The microstructure of an alloy is affected intensively by the cooling process.To figure out the inherent relation between the cooling rate and microstructure of an advanced nickel-based superalloy,experimental and numerical studies on the cooling process were conducted.Specifically,the measurement was performed concerning both the temperature of the specimen during the end-quench test and the size of the secondaryγ′phase of the specimen after that.The heat transfer coefficient of the quenched surface was determined by the inverse heat transfer method for simulation.The results show that the cooling rate of the quenched surface exceeds 1574 K/min.Based on the averaged cooling rate obtained from the simulation and the measured size of the secondaryγ′phase,an empirical correlation in a double logarithmic relationship between them is proposed.The relationship is verified by the experiment with specified cooling rates. 展开更多
关键词 end-quench test numerical simulation cooling rate heat transfer coefficient nickel-based superalloy
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Thin-bed thickness calculation formula and its approximation using peak frequency 被引量:13
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作者 Sun Luping Zheng Xiaodong Li Jingsong Shou Hao 《Applied Geophysics》 SCIE CSCD 2009年第3期234-240,299,共8页
Quantitative thickness estimation below tuning thickness is a great challenge in seismic exploration. Most studies focus on the thin-beds whose top and bottom reflection coefficients are of equal magnitude and opposit... Quantitative thickness estimation below tuning thickness is a great challenge in seismic exploration. Most studies focus on the thin-beds whose top and bottom reflection coefficients are of equal magnitude and opposite polarity. There is no systematic research on the other thin-bed types. In this article, all of the thin-beds are classified into four types: thin-beds with equal magnitude and opposite polarity, thin-beds with unequal magnitude and opposite polarity, thin-beds with equal magnitude and identical polarity, and thin-beds with unequal magnitude and identical polarity. By analytical study, an equation describing the general relationship between seismic peak frequency and thin-bed thickness was derived which shows there is a Complex implicit non-linear relationship between them and which is difficult to use in practice. In order to solve this problem, we simplify the relationship by Taylor expansion and discuss the precision of the approximation formulae with different orders for the four types of thin-beds. Compared with the traditional amplitude method for thin-bed thickness calculation, the method we present has a higher precision and isn't influenced by the absolute value of top or bottom reflection coefficient, so it is convenient for use in practice. 展开更多
关键词 thin-bed quantitative thickness calculation peak frequency Taylor expansion approximation
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Study Rheological Behavior for Rapeseed Oils 被引量:1
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作者 Ioana Stanciu 《Journal of Chemistry and Chemical Engineering》 2013年第2期184-186,共3页
Rheological behavior of this article presents rapeseed oil. Dynamic viscosity of rapeseed oil was determined at temperatures between 40 ℃-90 ℃ and shear rates ranging from 3.3-120 s1. All types of oils studied Bingh... Rheological behavior of this article presents rapeseed oil. Dynamic viscosity of rapeseed oil was determined at temperatures between 40 ℃-90 ℃ and shear rates ranging from 3.3-120 s1. All types of oils studied Bingham fluid behavior in the temperature range from 313-363 K. Correlation coefficients have similar values to one for all oils studied. 展开更多
关键词 Rheological behaviour rapeseed oil degummed rapeseed oil.
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Fluctuating Potential Barrier System with Correlated Spatial Noises
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作者 LIJing-Hui 《Communications in Theoretical Physics》 SCIE CAS CSCD 2004年第6期899-902,共4页
In this paper, we study a fluctuating potential barrier system with correlated spatial noises. Study shows that for this system, there is the resonant activation over the fluctuating potential barrier, and that the co... In this paper, we study a fluctuating potential barrier system with correlated spatial noises. Study shows that for this system, there is the resonant activation over the fluctuating potential barrier, and that the correlation between the different spatial noises can enhance (or weaken) the resonant activation. 展开更多
关键词 spatial noise resonant activation
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Investigation of the performance of the dish/stirling solar thermal electricity system
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作者 HUANG Hu-lin HAN Dong 《Journal of Energy and Power Engineering》 2007年第1期8-14,共7页
A dish/stifling solar thermal electricity system consists of two parts: a dish solar concentrator and a Stifling engine. For optimizing the system, in this paper, the mathematical model for concentrator design was es... A dish/stifling solar thermal electricity system consists of two parts: a dish solar concentrator and a Stifling engine. For optimizing the system, in this paper, the mathematical model for concentrator design was established and the effects of those design parameters of concentrator, such as the size and intensity of the focal point, the receiver temperature, on the efficiency of the Stifling engine and output power were numerically simulated. The results of the simulation revealed a close relationship between power and efficiency because of power losses, and there was a maximum for the engine efficiency and power with increasing solar radiation because there was a peak value of system efficiency with increasing receiver temperature. So, in view of our Stifling engine, the 450 rim angle and 6m focal length are optimal design for concentrator and the 800℃receiver temperature is best. 展开更多
关键词 dish concentrator stifling engine intensity of focal point power output system efficiency
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A Study on Energy Saving Rate for Variable Speed Condition of Multistage Centrifugal Pump 被引量:2
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作者 Sang-Ho Suh Rakibuzzaman +3 位作者 Kyung-Wuk Kim Hyoung-Ho Kim In Sik Yoon Min-Tae Cho 《Journal of Thermal Science》 SCIE EI CAS CSCD 2015年第6期566-573,共8页
Centrifugal pumps are being widely used in many industrial and commercial applications.Many of these pumps are being operated at constant speed but could provide energy savings through adjustable speed operations.The ... Centrifugal pumps are being widely used in many industrial and commercial applications.Many of these pumps are being operated at constant speed but could provide energy savings through adjustable speed operations.The purpose of this study was to get the energy saving rates of the multistage centrifugal pump with variable speed conditions.For this investigation an experimental set up of variable flow and pressure system was made to get energy saving rates and numerical analyses are applied to validate the pump performance.The energy saving and therefore the cost saving depends on the specific duty cycle of which the machine operates.Duty cycle is the proportion of time during which a component,device and system is operated.The duty cycle segmented into different flow rates and weighting the average value for each segment by the interval time.The system was operated at 50%or less of the pump capacity.The input power of the system was carried out by pump characteristics curve of each operating point.The energy consumption was done by the product of specific duty cycle and the input power of the system for constant speed and variable speed drive operation.The total energy consumed for constant speed drive pump was 75,770 k W.hr and for variable speed drive pump was 31,700 k W.hr.The total energy saving of the system was 44,070 k W.hr or 58.16%annually.So,this paper suggests a method of implementing an energy saving on variable-flow and pressure system of the multistage centrifugal pump. 展开更多
关键词 Multistage Centrifugal Pump Performance Analysis Energy saving rate SST Model Duty Cycle
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Application of wavelet transform in-ray spectra analysis
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作者 YU GuoLiang GU JianZhong +3 位作者 HOU Long LI ZhenYu WANG YanZhao ZHANG YiYun 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第9期1735-1739,共5页
The frequency distribution of different ingredients in-ray spectra,e.g.,photo-peak,fluctuations of counts and Compton region,is separately analyzed.After wavelet transform of-ray spectra,the wavelet coefficients of a ... The frequency distribution of different ingredients in-ray spectra,e.g.,photo-peak,fluctuations of counts and Compton region,is separately analyzed.After wavelet transform of-ray spectra,the wavelet coefficients of a photo-peak increase with transforming scales and these coefficients show direct proportion with intensity of peak at determinate scale.A novel algorithm based on wavelet transform is proposed and studied.The results indicate that most of the photo-peaks in multi-spectra can be determined accurately,the-rays energy and intensity of the peak can also be determined.This method has the prospect of being applied in on-line multi-spectra analysis in such fields as radioprotection and nuclear safety monitoring. 展开更多
关键词 wavelet transform -ray spectra photo-peak
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