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Jaw Crushers Most operations prefer jaw crushers for primary crushing. A large feed opening allows these crushers to receive larger-sized material than most other types of machines. Bearing speeds and loads are generally moderate, but, on occasion, the load spikes as uncrushable material passes through the chamber. In a typical jaw crusher, two outer bearings located on either side of the main

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The term "primary crusher," by definition, might embrace any type and size of crushing machine. The term implies that at least two stages of crushing are involved, but in many cases the machine which performs the function of initial crusher is the only crusher in the plant. The factors influencing the selection of a crusher for this service are much the same, regardless of how many

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In mathematics, a conic section (or simply conic) is a curve obtained as the intersection of the surface of a cone with a plane.The three types of conic section are the hyperbola, the parabola, and the ellipse; the circle is a special case of the ellipse, though historically it was sometimes called a fourth type. The ancient Greek mathematicians studied conic sections, culminating around 200

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The operation of a crusher is periodic with each period consisting of a nipping action and an opening action. During the opening part of the cycle material moves downward into the crusher and some material falls through and out. A certain amount of fresh feed is also taken in. This is illustrated in Figure 5.3. Let us now describe this behavior quantitatively. It is best to work with a

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Definition. A subset C of a vector space V is a cone (or sometimes called a linear cone) if for each x in C and positive scalars α, the product αx is in C. Note that some authors define cone with the scalar α ranging over all non-negative reals (rather than all positive reals, which does not include 0).. A cone C is a convex cone if αx + βy belongs to C, for any positive scalars α, β

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The term "primary crusher," by definition, might embrace any type and size of crushing machine. The term implies that at least two stages of crushing are involved, but in many cases the machine which performs the function of initial crusher is the only crusher in the plant. The factors influencing the selection of a crusher for this service are much the same, regardless of how many

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2 denotes the Euclidean norm. This problem arises in many situations, for example in statistical estima-tion problems such as linear regression. The problem dates back many years, at least to Gauss (1777-1855), who solved it to predict the trajec-tory of the planetoid Ceres. Linear programming problem: min cTx : aT ix b; i= 1;:::;m; where c2Rn

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8 CHAPTER 1. INTRODUCTION 1.1.2 Examples Least-squares problem: min x kAx bk2 2 where A2Rm n, b2Rm, and kk 2 denotes the Euclidean norm. This problem arises in many situations, for example in statistical estima-

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