In this paper, using Creager and Paris's blunt elliptical hole stress distribution area equation, it is applied to crack circular shaped defects the theoretical radius value, which equalizes maximum at defect tip in terms of value fracture toughness. By providing equality, critical stresses all dimensions tensile strength material were determined with a single mechanical test data. Compared pre...

Seeking the law of through-crack in double hole shaped charge can help reveal rock failure mechanism directional controlled blasting. Using LS-DYNA numerical simulation analysis, dynamic mechanical behaviors double-hole crack development and penetration elliptical bipolar linear-shaped blasting ordinary were compared studied. The results showed that it was difficult to form a straight line thro...

The permeability of the preform composite materials used in liquid molding processes such as resin transfer molding and structural reaction injection molding is a complex function of weave pattern and packing characteristics. The development of tools for predicting permeability as a function of these parameters is of great industrial importance. Such capability would speed process design and op...

This paper presents the design of rejection band centered at 5.5 GHz is obtained by etching out incomplete inverted C type slots coplanar waveguide (CPW) with band notch. The FR4 material is used as substrate here having a dielectric constant of 4.3. The impedance bandwidth of the proposed antenna covers the frequency range from 2.6GHz to13.89 GHz. The group delay shows a flat response lying wi...

The Grad–Shafranov plasma equilibrium equation was originally solved analytically in toroidal geometry, which fitted the geometric shape of first Tokamaks. poloidal surface Tokamak has evolved over years from a circular to D-shaped ellipse. natural geometry that describes such is prolate elliptical one, i.e., cap-cyclide coordinate system. When written this can be terms general Heun function. I...

We present results from a 49.4 ks Chandra ACIS-S observation of the nearby (z 1⁄4 0:059) X-shaped FR type II (FR II) radio galaxy 3C 403. This is the firstChandra observation of an X-shaped radio galaxy, and one of the goals of this pioneering study is to determine the relationship between the X-ray–emitting gas and the X-shaped radio morphology. We find that the X-ray isophotes of the hot gas ...

Study of permeability of Fibrous Composites is important in several natural and industrial processes in mechanical engineering. In this study, a comprehensive mathematical model is presented for calculation of normal permeability of ordered elliptical fibrous media. An innovative scale-analysis technique is employed for determining the normal permeability of elliptical fibrous media. In this te...

We present results from a 49.4 ks Chandra/ACIS-S observation of the nearby (z=0.059) X-shaped FRII radio galaxy 3C 403. This is the first Chandra observation of an X-shaped radio galaxy, and one of the goals of this pioneering study is to determine the relationship between the X-ray emitting gas and the X-shaped radio morphology. We find that the X-ray isophotes of the hot gas within ∼3.5 ′′ of...

the role of some ring structures in the distribution of porphyry copper deposits in south kerman porphyry copper belt is discussed. in the study area, ring structures are circular or elliptical shaped features which are partly recognized on satellite images. in this study, landsat multispectral images were used to identify ring structures in the area. the rudimentary identification stages of th...