This paper deals with the scattering of a TM plane wave from a perfectly conductive sinusoidal surface with finite extent. For comparison, however, we briefly discuss the diffraction by the sinusoidal surface with infinite extent, where we use the concept of the total diffraction cross section per unit surface introduced previously. To solve a case where the sinusoidal corrugation width is much...

The section deformation distribution of reinforced concrete components is nonlinear due to the size effect. Existing analysis models such as plastic hinge and truss element are based on plane cross-section assumption. cannot be accurately simulated. Therefore, in this paper, non-planar strain functions sections established. law influence geometrical characteristics load distributions beam ends ...

Gravitational lensing of a quasar by a spiral galaxy should often be accompanied by damped Lyα absorption and dust extinction due to the intervening gaseous disk. In nearly edge-on configurations, the surface mass density of the gas and stars in the disk could by itself split the quasar image and contribute significantly to the overall lensing cross section. We calculate the lensing probability...

background: in general, measurements of solar ultraviolet (uv) radiation are related to horizontal surfaces. while the hu­mans walking and standing outdoors expose to the natural solar uv radiation, their eyes, cheeks, extremities, trunks, or many other anatomical sites are close to vertical plane and random orient to different directions. in this study, we character­ized the diurnal variations...

In modern microwave systems, a wide variety of frequency-selective devices are used, which performed according to certain technologies. Waveguide filters currently rapidly developing class functional devices. The manufacturing technologies, calculation methods and designs such is great. this paper, we consider band-pass filter on rectangular waveguide with cross section 35×15 mm, in which, inst...

We read with interest the work by Urfalıoğlu and colleagues about ultrasound-guided versus surgical transversus abdominis plane block in obese patients. The conclusion of this study is that ultrasound guided and surgical TAP blocks were safe and had similar efficacy in providing post-operative analgesia in obese pregnant women following cesarean section. We agree that TAP block, surgical or ult...

The Unreinforced Wall (URM) elements that are most susceptible to out-of-plane failure are wall elements of the upper storeys where the accelerations are largest. In modern URM buildings with reinforced concrete slabs, the out-of-plane mechanism involves typically a storey-high wall element, which is subjected at its base and top to the accelerations of the corresponding floor slabs. The accele...

This study focuses on the optimization of the plane structure. Sequential quadratic programming (SQP) will be utilized, which is one of the most efficient methods for solving nonlinearly constrained optimization problems. A new formulation for the second order sensitivity analysis of the two-dimensional finite element will be developed. All the second order required derivatives will be calculat...

The advancement in steel fabrication technology extends the structural and constructional advantages of cellular beams into arched structure members. However, less attention is given to understanding in-plane out-of-plane behavior performance beams. This article presents a numerical study using finite element package ABAQUS investigate effect arch axis geometry (circular parabolic) impact end s...

The article describes the features of work beams with a thin transverse corrugated web plate. Exponential fractional regression is presented, which allows one to estimate relative height plate sections working together flanges, obtained by authors based on an analysis numerical experiments. Based work, method proposed for describing stress state arbitrary cross-section I-beam (the profile corru...