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1
Content available Study on the subgrade service depth of moving vehicles under multi-wheeled superposition effect
Zhou Yanmin, Wang Haiyang, Kong Lingyun, Liu Jialiang, Wang Jie, Wang Zhimei
Archives of Civil Engineering
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2022
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Vol. 68, nr 2
483--499
EN
The stress superposition effect in the midline area of the multi-wheeled vehicles produced by moving vehicles load is generally ignored, which leads to smaller results in research of subgrade service depth. Based on the elastic mechanics theory, the analytical solution of subgrade dynamic response under moving vehicles load is derived with compound elastic layers. The characteristics of subgrade dynamic stress distribution under the action of moving vehicles are analyzed by using Midas Gts Nx numerical simulation software, and the influence of static and dynamic axle load on the subgrade service depth is compared. The results demonstrate that the subgrade dynamic stress in the under-wheel area attenuates rapidly along the depth direction, while the subgrade dynamic stress in the midline area increases at first and subsequently decreases along the same direction. With the increase of subgrade dynamic stress, the shape of dynamic stress isosurface changes from bimodal to unimodal. Whether in the form of static or dynamic axle load, the subgrade service depth in the middle line area is larger than that in under-wheel area, and the influence of dynamic axle load on the subgrade service depth is greater than that of static axle load. The wheel distance and vehicle velocity have a significant influence on the subgrade service depth. With the increase of vehicle velocity, the subgrade service depth decreases. With the increase of wheel distance, the subgrade service depth decreases.
2
Content available A screw dislocation located outside, inside or on the interface of a parabolic elastic inhomogeneity
Wang X., Schiavone P.
Archives of Mechanics
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2021
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Vol. 73, nr 3
219--235
EN
Using conformal mapping techniques, superposition and analytic continuation, we derive analytic solutions to the problem of a screw dislocation interacting with a parabolic elastic inhomogeneity. The screw dislocation can be located anywhere either in the surrounding matrix or in the parabolic inhomogeneity or simply on the parabolic interface itself. We obtain explicit expressions for the two analytic functions in the image plane characterizing the elastic fields describing displacement and stresses in the two-phase composite. Using the Peach-Koehler formula, we also obtain the image force acting on the screw dislocation. The analytic function defined in the parabolic inhomogeneity in the physical plane can be interpreted in terms of real and image screw dislocations for any location of the real screw dislocation.
3
Content available Multi-direction digital moving mask method for fabricating continuous microstructures
Zhang Z, Gao Y, Luo N, Zhong K, Liu Z
Optica Applicata
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2015
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Vol. 45, nr 1
79--88
EN
The multi-direction digital moving mask method, employing the superposition of the exposure along various moving directions, is developed for fabricating continuous microstructures. The mask pattern corresponding to each moving direction is determined by projecting the target dose profile in the corresponding moving direction. All the mask patterns are dynamically exposed on the same substrate layer by layer so as to form a 3D profile of the exposure dose. The selection criterion of a quantization number and moving-direction number is discussed. For verification of the multi-direction moving method, experiments are performed to fabricate a square pyramid array and square-based microlens array by moving along two orthogonal directions, and round-based microlens array by moving along six directions.
4
Content available Elementy potencjałowej teorii bezpieczeństwa wielkich systemów prakseologicznych
Ficoń K.
Zeszyty Naukowe Akademii Marynarki Wojennej
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2011
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R. 52 nr 3 (186)
163-188
PL
W artykule podjęto nowatorską próbę ilościowego wyrażenia stanu bezpieczeństwa modelowanego systemu prakseologicznego za pomocą syntetycznego wskaźnika jakości, wyrażonego w postaci umownego potencjału bezpieczeństwa. Wypadkowy potencjał bezpieczeństwa jest złożonym funkcjonałem dwóch niejawnych funkcji — potencjału realnych zagrożeń systemowych i potencjału rzeczywistych zdolności operacyjnych systemu przeciwdziałania kryzysowego. Każdy z powyższych potencjałów składowych jest superpozycją potencjału dwóch rozłącznych kategorii — potencjału hipotetycznego i potencjału rzeczywistego, odpowiednio systemu zagrożeń bezpieczeństwa i systemu reagowania kryzysowego.
EN
The study is an innovative attempt to quantify the safety of the modeled praxeological system using synthetic performance index, expressed in terms of contractual security capabilities. The resultant potential for security is a complex functional of two functions — the real potential systemic risks and the potential of actual operational capabilities of the system for crisis prevention. Each of these potential components is a superposition of two discrete categories of potential — the hypothetical potential and the actual potential of the threat to security system and of the emergency response system respectively.
5
Content available remote On the quasi N-almost periodic functions
Stoiński S.
Commentationes Mathematicae
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2010
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Vol. 50, [Z] 1
61-67
EN
In this note we present the definition, examples and some properties of quasi N–almost periodic functions, i. e. certain almost periodic functions in the sense of Levitan.
6
Content available remote On the almost periodic functions in the sense of Levitan
Michałowicz A., Stoiński S.
Annales Societatis Mathematicae Polonae. Seria 1: Commentationes Mathematicae
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2007
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Vol. 47, [Z] 2
149-159
EN
In this note we present some theorems on the superposition of an (NVp)-almost periodic (a.p. for short) function, a μ-a.p. function and an (Nμ)-a.p. function. Moreover, we prove a theorem on the bounded primary function of an (NS^p)-a.p. function. Finally, we prove that the inverse of a V_p-a.p. function is (NV_p)-a.p.
7
Content available Programowanie właściwości sorpcyjnych kakao instant w postaci sypkiej z zastosowaniem zasady superpozycji
Ostrowska-Ligęza E., Lenart A.
Inżynieria Rolnicza
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2006
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R. 10, nr 4(79)
29-35
PL
Materiał badawczy stanowiły następujące surowce w postaci sypkiej: cukier kryształ, kakao, mleko w proszku i maltodekstryna. Wyznaczono kinetykę adsorpcji pary wodnej przy trzech poziomach aktywności wody środowiska (0,34, 0,65 i 0,90). Do uzyskanych danych empirycznych dopasowano równanie wykładnicze i zastosowano zasadę superpozycji uwzględniającą skład surowcowy mieszanin. Wykazano, że zasadę superpozycji można wykorzystywać przy trzech poziomach aktywności wody środowiska 0,34; 0,65 i 0,90 w początkowej fazie procesu adsorpcji pary wodnej.
EN
The materials were following powders: crystal sugars, pure cacao, milk powder and maltodextrin. Kinetic of water adsorption were determinated in three levels of environment at water activity (0,34; 0,65; 0,90). For empirical date were adjusted exponential equation and were complied superposition with considerations of material composition. It was proved that superposition could use in three levels of environment at water activity (0,34; 0,65; 0,90) in initial phase of water adsorption kinetic.
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