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    GREY GM(1,1)MODEL IN FERROALLOY BURDENING
    铁合金生产中的灰色GM(1,1)模型
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    This thesis uses new econometric analytical tools,such as the cointegration theory and the vectorial autoregression(VAR)model , to forecast the amount and structure of the steel market demand.
    本文运用最新的计量分析方法,如协整理论、向量自相关(VAR)模型,对我国钢材市场需求的总量与结构进行了预测。
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    Thus in this paper a two-dimension thermal elasto-plastic and creep stress (TEPC) model for thin slab strand is developed.
    针对这一目的 ,文中建立了薄板坯连铸二维热弹塑性蠕变应力(TEPC)模型
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    then, under abnormal/unusual production conditions(or on the incomplete data section), an expertise and mechanism based(EM) model is built, in which some hypothetical or statistical parameters are modified by empirical rules;
    对于异常或不常用工况(即数据不完备区),通过专家经验规则修正部分假定或统计参数方式建立经验机理模型;
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    In this paper,a FNN(Fuzzy Neural Network) model to forecast the ingredient of the sintering block is brought forward and its feasibility is validated by simulation.
    文章提出了一种烧结块成分预测的模糊神经网络模型,并通过仿真验证了其可行性。
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Reductive group actions on affine quadrics with 1-dimensional quotient: Linearization when a linear model exists
      
A linear model for a given action is a linear orthogonal action with the same orbit types and equivalent slice representations.
      
We prove that if a reductive group action on an affine quadric with a 1-dimensional quotient has a linear model, then the action is linearizable.
      
Using the path model and the theory of crystals, we generalize the concept of patterns to arbitrary complex semi-simple algebraic groups.
      
In the model situationD is the Siegel disc,S is the manifold of Lagrangian subspaces andG is the symplectic group.
      
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The results of blowing "semi-steel", i.e. hot metal after removing elements like V, Cr etc., in a LD hot model and LD converter are presented. As "semi-steel" con-tains almost no silicon and manganese, so the addition of slag fluidizer rapid formation of slag to avoid formation of skull on the lance is the main topic to bediscussed in this paper. Lime, as the main slag forming substance, has a very high melting point. It is found that the presence of small amounts of high melting point compounds such as...

The results of blowing "semi-steel", i.e. hot metal after removing elements like V, Cr etc., in a LD hot model and LD converter are presented. As "semi-steel" con-tains almost no silicon and manganese, so the addition of slag fluidizer rapid formation of slag to avoid formation of skull on the lance is the main topic to bediscussed in this paper. Lime, as the main slag forming substance, has a very high melting point. It is found that the presence of small amounts of high melting point compounds such as V_2O_3, TiO_2 and Cr_2O_3, can also lower the slag melting point. In order to help the dissolution of lime, the natural minerals gangue diabase, basal and clay consisting of SiO_2, MgO, Al_2O_3, FeO and several other oxides have been tried. These natural minerals with low melting point, accelerate the dissolution of lime, and form a slag of high basicity and good fluidity suitable for desulphurization. The tests indicated that the blowing is quiet and desulphurization satisfactory. Low grade silicious manganese ore and tailings from the benecification of vanadium-bearing titaniferous magnatite(both available in our country are also suggested as possible slag fluidizer

提取了V、Cr等若干元素之后的铁水习惯称为"半钢".本文叙述了在顶吹转炉热模型和顶吹转炉所做的"半钢"吹炼生产和试验的若干结果.由于"半钢"几乎不含硅、锰等元素,快速加入炉渣助熔剂以避免粘枪成为本文讨论的主题.作为炼钢熔渣主要成分的石灰熔点很高.试验中发现一定含最的V_2O_3、TiO_2及Cr_2O_3(高熔点化合物)均能降低炉渣的熔点.为了溶解高熔点的石灰,我们试验采用了由SiO_2、Al_2O_3、MgO、FeO和一些其他氧化物组成的若干天然复合矿物,如辉绿岩,玄武岩、粘土等.这些天然复合矿物具有较低的熔点并且能满足流动性好的高碱度炉渣的去硫作用.试验结果表明冶炼过程是平稳的,而且脱硫是满意的.作者认为我国大量存在的高硅贫锰矿、钒钛磁铁矿尾矿也可能是"半钢"炼钢的良好炉渣助熔剂.

An investigation,on the basis of model experiments,to explore the influence of different profiles and positions of softening-melting zone in a blast furnace on gas distribution and gas energy utilization has been presented in the paper Better, permeability would be attained as coke slits being placed in between soffening-melting layers, thus passing the gas flow through coke slits more easily.Owing to an appropriate profile of softening-melting zone being kept, the optimum distribution of coke slits would...

An investigation,on the basis of model experiments,to explore the influence of different profiles and positions of softening-melting zone in a blast furnace on gas distribution and gas energy utilization has been presented in the paper Better, permeability would be attained as coke slits being placed in between soffening-melting layers, thus passing the gas flow through coke slits more easily.Owing to an appropriate profile of softening-melting zone being kept, the optimum distribution of coke slits would be formed, and so the smelting intensity may be of benifit to improve and the process of hard driving strengthend as well as the pressure drop in blast furnace decreased. The profile of inverse V-shaped softening-melting zone is of advantage to open up the gas passage from central part of furnace so as to impel the gas in central part to flow out unobstructedly. As a result, a "dendritic distribution" of streamlines,availabe to work more uniformly, actively and stably in furnace hearth, has been formed.This profile is such that may be advantageous to increase intensity, to develop the further utilization of gas energy and to gain high qualities of products. With the top layer of inverse V-shaped softening-melting zone as located at high position, the pressure drop in furnace be decreased, so that to increase blowing rate on hard driving is probable. As to the indirect reduction zone, however, would be con- traded. Conversely,while the top layer located low, the indirect reduction zone spreads out, thus resulting in the increase of pressure drop and the overdevelopment of peripteral gas flow. For generality, the optimum profile or/and the optimum position of softening-melting zone depend upon the comprehensive conditions in operation. Usually, such a position is gdod to start it from low part of shaft.

本文以模型实验为基础,研究了高炉内不同熔软带形状、位置对气流分布和煤气利用的影响。软熔层之间的焦炭夹层透气性良好,气流容易通过,维持适宜的软熔层藉以形成适宜的焦炭夹层分布,会使高炉压差降低,有利于提高强度,强化冶炼过程。倒V型的软熔带结构有利于疏通中心,促进中心气流开放,形成自下而上“树枝状”的流向线分布,使炉缸工作均匀、活跃、稳定。这种结构也有利于提高冶炼强度,改善煤气利用和获得优质生铁,倒V型软熔带的顶层出现位置高时,炉内压差降低,有利于加风强化,但使间接还原区缩小;顶层出现位置低时间接还原区扩大,但可能导致压差升高和边缘过于发展。软熔带的适宜位置应根据综合冶熔条件确定,一般以始于炉身下部为宜。

The increase of hot blast temperature by means of staggered parallel blasting in hot stoves is discussed.Through simulation study, it has been theoretically proved that two stoves staggered parallel on blast has a higher thermal efficiency than that of a single stove on blast. The thermal load is also higher than that of a single stove and the dome temperature is lower. The fundamental concepts relating to high temperature blasting operation are described.The amount of heat required for the next blast cycle...

The increase of hot blast temperature by means of staggered parallel blasting in hot stoves is discussed.Through simulation study, it has been theoretically proved that two stoves staggered parallel on blast has a higher thermal efficiency than that of a single stove on blast. The thermal load is also higher than that of a single stove and the dome temperature is lower. The fundamental concepts relating to high temperature blasting operation are described.The amount of heat required for the next blast cycle and the time available to get optimum results are calculated with the aid of a computer. The gas/air ratio and their individual flows are controlled for effective combustion in the hot stove in the staggered parallel blasting model. The staggered parallel blasting model is used to control the hot blast temperature. The computer controls the volume distribution between the stoves on blast by. directly contiolling the cold blast regulating valves.

本文讨论利用交错并联送风方式提高热风温度。通过模拟研究,从理论上证明交错并联送风比单独送风有高的热效率,热负荷也比单独送风高,而拱顶温度可以较低。这种高风温操作将使热风炉设计具有特征,还阐述了有关高风温操作的基本概念。交错并联送风的意义在于提高热风温度。计算机计算下次送风期所需要的热量和送风时间,以得到最好的结果。交错并联送风模型控制煤气与空气的比例和各自的流量使热风炉有效地燃烧。其功能是用交错并联送风模型来进行热风温度的控制。计算机是由直接控制送风调节阀来控制正在鼓风的两座热风炉的风量分配。

 
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