The notation and terminology used in this paper have been introduced in the following papers: [2], [7], [1], [3], [4], [5], [17], [11], [13], [6], [9], [14], [10], [8], [12], and [18]. One can prove the following propositions: (1) Let n, i be elements of N, q be an element of Rn, and p be a point of En T. If i ∈ Seg n and q = p, then |pi| ≤ |q|. (2) For every real number x and for every element...

Let S be a non empty 1-sorted structure, let E be a set, let A be an action of the carrier of S on E, and let s be an element of S. We introduce A a s as a synonym of A(s). Let S be a non empty 1-sorted structure, let E be a set, let A be an action of the carrier of S on E, and let s be an element of S. Then A a s is a function from E into E. Let S be a unital non empty groupoid, let E be a set...

kopet-dagh basin is located in north and northeast of iran. khangiran formation is one of the most important formations of paleogene deposits. for study of khangiran formation bivalves, chehelkaman syncline section has been selected. this section located in west of sarakhs city, east of kopet-dagh basin. lithology of this formation in the sarakhs region composed of marl, marly limestone and sil...

Abstract The valorisation of oil palm solid wastes is always a fascinating subject. industries produce millions tons these high lignocellulose materials in empty fruit bunch, kernel shells, fronds, and others. technological considerations are based on selecting the best pretreatment methods, fermentation, chemical processing technologies. Nevertheless, selected method faces multiple concerns, s...

The high efficiency of monocoque cylindrical shells in carrying axial loads is curtailed by their extreme sensitivity to imperfections. For practical applications, this issue has been alleviated by introducing closely stiffened shells which, however, require expensive manufacturing. Here we present an alternative approach that provides a fundamentally different solution. We design symmetry-brea...

In engineering applications, especially in the field of modern military defence, the cylindrical shells, conical shells and coupled conical-cylindrical shells are basically simplified models of many types of weapons and equipment, such as aircraft, missiles, and submarines. The study of free vibrational characteristics of cylindrical shells is comprehensive. Initially, researchers1-5 investigat...

Estimation of the nonlinear buckling capacity of thin walled shells is one of the most important aspects of structural mechanics. In this study the axial buckling load of 132 stiffened shells were numerically calculated. The applicability of artificial neural networks (ANN) in predicting the buckling capacity of vertically stiffened shells was studied. To this end feed forward (FF) multi-layer ...

     Due to the environmental problems caused by the accumulation of significant amounts of waste from peanut cultivation, it seems necessary to provide a solution for the reuse of this organic waste. Therefore, this experiment was conducted to investigate the possibility of using compost of peanut shells in potting Begonia rex. This research was based on randomized complete block desi...

The spherically symmetric thin shells of the barotropic fluids with the linear equation of state are considered within the frameworks of general relativity. We study several aspects of the shells as completely relativistic models of stars, first of all the neutron stars and white dwarfs, and circumstellar shells. The exact equations of motion of the shells are obtained. Also we calculate the pa...