Results 1 to 10 of about 44,228 (247)

On Expansive Mappings

open access: yesMathematics, 2019
When finding an original proof to a known result describing expansive mappings on compact metric spaces as surjective isometries, we reveal that relaxing the condition of compactness to total boundedness preserves the isometry property and nearly that of
Marat V. Markin, Edward S. Sichel
doaj   +1 more source

Local Squeezing Casting Influence on the Compactness of AlSi10Mg Alloy Castings [PDF]

open access: yesMetalurgija, 2007
The aim of the local squeezing casting process examination has been to eliminate the hot spot i.e. the place of potential formation of shrinkage porosity. The influence of variation of process parameters on the density i.e.
Brodarac, Z.   +3 more
doaj  

Excess paste method to formulate a self-compacting concrete

open access: yesJournal of Building Materials and Structures, 2014
On the basis of the principle that a concrete is composed of a liquid phase (paste) and a solid phase (aggregates with fixed gravel/sand ratio), the concrete self-compacting properties come necessarily from those of the paste.
Abdelkader Mebrouki   +3 more
doaj   +1 more source

Dual Toeplitz Operators on Bounded Symmetric Domains

open access: yesMathematics
We give some characterizations of dual Toeplitz operators acting on the orthogonal complement of the Bergman space over bounded symmetric domains. Our main result characterizes those finite sums of products of Toeplitz operators that are themselves dual ...
Jianxiang Dong
doaj   +1 more source

Impact of urban spatial compactness on air pollution in China

open access: yesFrontiers in Environmental Science
As China’s urbanization advances, it is necessary to explore the path of reducing air pollution from the perspective of urban spatial compactness. We established a dataset containing Landcover data, PM2.5 surface annual average concentration data, urban ...
Changyi Liang   +3 more
doaj   +1 more source

Pre-Compactness of Sets and Compactness of Commutators for Riesz Potential in Global Morrey-Type Spaces

open access: yesMathematics
In this paper, we establish sufficient conditions for the pre-compactness of sets in the global Morrey-type spaces GMpθw(·). Our main result is the compactness of the commutators of the Riesz potential b,Iα in global Morrey-type spaces from GMp1θ1w1 ...
Nurzhan Bokayev   +3 more
doaj   +1 more source

High-Power Hydromechanical Transmissions: Patent-Informational and Computational Investigation. Part 3. Gearboxes with Four Degrees of Freedom and General Analysis

open access: yesМеханика машин, механизмов и материалов, 2015
This article finishes publication of results of high-power hydromechanical transmissions investigation. The first and the second parts were published in previous editions of journal. In this part gearboxes with four and more degrees of freedomareanalyzed
Vladimir B. Algin   +2 more
doaj  

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