What is the smallest circular or square wall hole that a regular tetrahedron can pass? This problem was solved by Itoh–Tanoue– Zamfirescu [8]. Then, we settled the case of equilateral triangular hole in [1]. Motivated by these results, we consider the corresponding problems in higher dimensions. Among other results, we determine the minimum (n−1)-dimensional ball hole that a unit regular n-simp...

Figure 1. Spray gun used in electron microscopy. A. Assembled spray gun. B. Outer envelope. C. Insert tube. The component parts have the following specifications: 1. Nozzle head X inch threads, 0.030 inch aperture. 2. "O" ring, Y8 inch outside diameter (o.d.) and Y inch inside diameter (i.d.). S. X8 inch threads, tapered end. 4. Brass tubing %6 inch o.d.; 0.035 inch wall. .946 inch threads, mov...

a new method for determination of residual stresses in the bottom layers of laminated composites is developed. in this method the residual stresses are determined by performing a consecutive drilling of laminated composites in the center of the rosette and recording the strains after drilling each layer. the depth of the hole in each step is equal to the thickness of each layer and the maximum ...

Radius of quantum dot Exciton binding energy and electron-hole recombination probability are presented as the two important metrics for investigating effect of dot size on electronhole interaction in CdSe quantum dots. Direct computation of electron-hole recombination probability is challenging because it requires an accurate mathematical description of electron-hole wavefunction in the neighbo...

INTRODUCTION The aim of this study was to evaluate the outcome of Osteoplug, a novel biodegradable polymer burr-hole cover implant, used in patients with burr holes done for drainage of chronic subdural haematoma. METHODS 12 patients with chronic subdural haematoma had Osteoplug implants inserted into their burr holes after evacuation of the haematoma. Osteoplug is a biodegradable polycaprola...

Sudden falls of large-area hard roofs in a mined area release a large amount of elastic energy, generate dynamic loads, and cause disasters such as impact ground pressure and gas outbursts. To address these problems, in this study, the sleeve fracturing method (SFM) was applied to weaken a hard roof. The numerical simulation software FLAC3D was used to develop three models based on an analysis ...

13  Abstract-In this study, the wok is carried out to analyzed, the stresses of plate with oblique hole with the Finite Element Analysis. Stress analysis of a series of flat plates with oblique holes subjected to axial tension has been carried out using the finite element method (FEM). Different plate hole diameter-width ratios, angles of hole obliquity have been considered to provide stress c...