Results 11 to 20 of about 441,585 (267)
The Electronic Journal of Combinatorics, 2011 Concave compositions are compositions (i.e. ordered partitions) of a number in which the parts decrease up to the middle summand(s) and increase thereafter. Perhaps the most surprising result is for even length, concave compositions where the generating function turns out to be the quotient of two instances of the pentagonal number theorem with ...
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SSRN Electronic Journal, 2013 Drilling expenses has increased sharply in recent years. Average meters drilled per day significantly influences exploration costs. Hence it is important to understand the factors that determine meter per day. In this study we analyse the effect of drilling depth on meter per day.
Osmundsen, Petter, Roll, Kristin Helen
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A New Approach to Concavity Fuzzification
Journal of Mathematics, 2021 In this paper, we introduce a more general approach to the fuzzification of fuzzy concavity. More specifically, the degree of L,M-fuzzy concavity is introduced and characterized as a generalization of L-concave structure and L,M-fuzzy concave structure ...
Ibtesam Alshammari +2 more
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Shock and Vibration, 2012 This paper presents the dynamic response of an Euler- Bernoulli beam supported on two-parameter Pasternak foundation subjected to moving load as well as moving mass. Modal analysis along with Fourier transform technique is employed to find the analytical
Rajib Ul Alam Uzzal +2 more
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Concave Diffraction Gratings by High-Precision Injection Moulding
Proceedings, 2019 As an example of the applicable process chain, a concave grating (1175 grooves/mm) with an active area of approx. 24 mm to 24 mm has been replicated by means of electroplating and further by injection moulding with polycarbonate, resulting in a surface ...
Manuel Walch, Alexander Wörle
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Log-concavity and strong log-concavity: A review
Statistics Surveys, 2014 We review and formulate results concerning log-concavity and strong-log-concavity in both discrete and continuous settings. We show how preservation of log-concavity and strongly log-concavity on $\mathbb{R}$ under convolution follows from a fundamental monotonicity result of Efron (1969).
Saumard, Adrien, Wellner, Jon A.
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Impact of Concave and Convex Solid Surfaces By Liquid-Like Projectiles
Tikrit Journal of Engineering Sciences, 2007 A theoretical and experimental investigation of the normal impact of a flat-ended liquid slug onto ductile cylindrical solid targets is presented. The liquid slug is simulated by wax which is known to behave as a liquid in high speed impact situations ...
Riyadh N. Kiter, Sabah A. L. Salem
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Nonlinear Concave Spiral Waves in Active Media Transferring Energy [PDF]
EPJ Web of Conferences, 2019 Spiral concave autowaves are widely implemented in physics, chemistry, hydrodynamics, meteorology and other fields. A mathematical model of spiral concave autowaves based on the Fitzhugh-Nagumo equation and modified axiomatic models are presented.
Mazurov Mikhail
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Multiplicative Concavity of the Integral of Multiplicatively Concave Functions [PDF]
Journal of Inequalities and Applications, 2010 A real-valued function \(f:I\subseteq {\mathbb R} \rightarrow (0,\infty)\) is said to be multiplicatively convex if \[ f(x^{1/2}y^{1/2}) \leq f^{1/2}(x)f^{1/2}(y) \] for all \(x,y \in I\). And \(f\) is called multiplicatively concave if \(1/f\) is multiplicatively convex. Multiplicatively convexity on \(E\subseteq {\mathbb R}_+^2\) is defined similarly.
Yu-Ming Chu, Xiao-Ming Zhang
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Behavior and model of grain separation for a small axial flow maize shelling unit
Engineering and Applied Science Research, 2023 Shelling and grain separation by a small axial flow maize sheller is influenced by the performance of both the maize shelling and cleaning units. For this study, the shelling and grain separation behavior were examined in a mini-maize grain separation ...
Waree Srison +3 more
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