期刊文献+
共找到6篇文章
< 1 >
每页显示 20 50 100
Development of process energy intensity formula under different state variables 被引量:3
1
作者 陈光 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2004年第6期694-696,共3页
In a production process, the actual energy consumption is greatly affected by the production state. Certain processing operations are classified into six states, including normal production, abnormal production, plann... In a production process, the actual energy consumption is greatly affected by the production state. Certain processing operations are classified into six states, including normal production, abnormal production, planned overhaul, unplanned overhaul, transitional period from unplanned overhaul to normal production (referred for short as unplanned transition) and transitional period from planned overhaul to normal production (referred for short as planned transition). The article takes the analysis of relationship between different states of a certain processing operation and corresponding energy consumptions as a startup point to develop a process energy intensity formula with variables of operating rate, yielding rate and operating frequency, etc. This process energy intensity formula can be used to analyze effectively the pattern of impact exerted by different state variables on energy consumption. 展开更多
关键词 process energy intensity production state production variable operating rate yielding rate
下载PDF
Evaluation of rope shovel operators in surface coal mining using a Multi-Attribute Decision-Making model 被引量:2
2
作者 Vukotic Ivana Kecojevic Vladislav 《International Journal of Mining Science and Technology》 SCIE EI 2014年第2期259-268,共10页
Rope shovels are used to dig and load materials in surface mines. One of the main factors that influence the production rate and energy consumption of rope shovels is the performance of the operator. This paper presen... Rope shovels are used to dig and load materials in surface mines. One of the main factors that influence the production rate and energy consumption of rope shovels is the performance of the operator. This paper presents a method for evaluating rope shovel operators using the Multi-Attribute Decision-Making (MADM) model. Data used in this research were collected from an operating surface coal mine in the southern United States. The MADM model consists of attributes, their weights of importance, and alter- natives. Shovel operators are considered the alternatives, The energy consumption model was developed with multiple regression analysis, and its variables were included in the MADM model as attributes. Preferences with respect to min/max of the defined attributes were obtained with multi-objective opti- mization. Multi-objective optimization was conducted with the overall goal of minimizing energy con- sumption and maximizing production rate. Weights of importance of the attributes were determined by the Analytical Hierarchy Process (AHP), The overall evaluation of operators was performed by one of the MADM models, i.e., PROMETHEE If. The research results presented here may be used by mining professionals to held evaluate the performance of rode shovel operators in surface mining. 展开更多
关键词 Rope shovel Operator evaluation Production rate Energy consumption AHP
下载PDF
ON THE RATE OF POINTWISE CONVERGENCE OF THE DURRMEYER-TYPE OPERATORS 被引量:1
3
作者 G. Aniol P. Pych-Taberska 《Analysis in Theory and Applications》 1995年第2期94-105,共12页
For bounded or some locally bounded functions f measurable on an interval I there is estimated the rate of convergence of the Durrmeyer-type operators Lnf at those points x∈IntI at which the one-sided limits f(x±... For bounded or some locally bounded functions f measurable on an interval I there is estimated the rate of convergence of the Durrmeyer-type operators Lnf at those points x∈IntI at which the one-sided limits f(x± 0) exist. In the main theorems the Chanturiya's modulus of variation is used. 展开更多
关键词 ON THE RATE OF POINTWISE CONVERGENCE OF THE DURRMEYER-TYPE OPERATORS LIM
下载PDF
Process optimization of billet continuous caster and practice verification
4
作者 DI Mingjun and WANG Jianxin Steelmaking Plant,Xinjiang Bayi Iron & steel Co.,Ltd.,Baosteel Group, Urumqi 830022,Xinjiang,China 《Baosteel Technical Research》 CAS 2010年第S1期26-,共1页
This study analyzes the factors of influence on 0~# continuous caster in No.1 Steelmaking Plant of Xinjiang Bayi Iron & Steel Corporation(hereinafter referred to as Basteel).Diameter of tundish upper nozzle is sma... This study analyzes the factors of influence on 0~# continuous caster in No.1 Steelmaking Plant of Xinjiang Bayi Iron & Steel Corporation(hereinafter referred to as Basteel).Diameter of tundish upper nozzle is small,and the molten steel leakage accidents have been greatly manifolded in the high casting speed.In order to increase yield of 0~# continuouse caster in No.1 Steelmaking Plant of Xinjiang Bayi Iron & Steel Corporation,and a series of amelioration measure was put forward.Through enlarging diameter of tundish upper nozzle(fromφ21 mm toφ21.5 mm ),after the water distribution of the secondary cooling was optimized.Based on stabilizing the quality,improving the average casting speed and work rate of the caster,the capacity of the billet continuous caster was improved.A better results was gained;the average casting speed had been increased from 3.04 m/min to 3.21 m/min.Production of the caster had been improved from 1 005 179.926 t in 2008 to 1 040 853.075 t in 2009.Quality of the concasting billets and production had also been stabilized. 展开更多
关键词 casting speed operation rate secondary cooling scheme tundish upper nozzle
下载PDF
Dephosphorization stability of hot metal by double slag operation in basic oxygen furnace 被引量:7
5
作者 Wei Wu Shi-fan Dai Yue Liu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2017年第9期908-915,共8页
Double slag process was adopted to produce low-phosphorus steel from middle-phosphorus hot metal.To achieve a stable dephosphorization operation,conventional process was modified as follows:the blowing time was exten... Double slag process was adopted to produce low-phosphorus steel from middle-phosphorus hot metal.To achieve a stable dephosphorization operation,conventional process was modified as follows:the blowing time was extended by approximately 1min by reducing the oxygen supply flow rate;calcium ferrite pellets were added to adjust the slag composition and viscosity;the dumping temperature was lowered by 30-50°C by the addition of calcium ferrite pellets during the double slag process to prevent phosphorus in the slag from returning to the molten steel;and the bottom-blown gas flow was increased during the blowing process.For 40 heats of comparative experiments,the rate of dephosphorization reached 91% and ranged between 87% and 95%;the phosphorus,sulfur,manganese,and oxygen contents calculated according to the compositions of molten steel and slag as well as the temperature of molten steel at the end-point of the basic oxygen furnace process were similar to the equilibrium values for the reaction between the slag and the steel.Less free calcium oxide and metallic iron were present in the final slag,and the surface of the slag mineral phase was smooth,clear,and well developed,which showed that the slag exhibited better melting effects than that produced using the conventional slag process.A steady phosphorus capacity in the slag and stable dephosphorization effects were achieved. 展开更多
关键词 Medium-phosphorus hot metal Double slag operation Dephosphorization rate Phosphorus capacity Basic oxygen furnace
原文传递
Applications of an IS-MP Model with Yield Curve
6
作者 Henry Wang Bill Z. Yang 《Frontiers of Economics in China-Selected Publications from Chinese Universities》 2016年第1期142-155,共14页
This paper interest rates (i.e., the recent macroeconomic presents an IS-MP model with the term structure of yield curve) and discusses some of its applications to activities and policy issues. Specifically, the mod... This paper interest rates (i.e., the recent macroeconomic presents an IS-MP model with the term structure of yield curve) and discusses some of its applications to activities and policy issues. Specifically, the model is employed to explain (1) why a steepening yield curve may signal the subsequent economic expansion, (2) why long-term zero interest rate policy (ZIRP) may not completely avoid recessions, but disables the yield curve from being inverted to signal the following economic recession, (3) how Operation Twist (OT) may help ease the recession, in particular, under ZIRP, and what limit it may face. 展开更多
关键词 IS-MP model yield curve zero interest rate policy (ZIRP) operation Twist (OT)
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部