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[en] This article describes the analytical method of measuring the secondary power consumption, necessitated by the installation of a grading device in the peripheral part of the grinding chamber in the desintegrator. There is a calculation model for defining the power input of the disintegrator increased by the extra power demand, required to rotate the grading device and to grind the material in the area between the external row of hammers and the grading device. The work has determined the inertia moments of a cylindrical section of the grading device with armour plates. The processing capacity of the grading device is adjusted to the conveying capacity of the auger feeder. The grading device enables one to increase the concentration of particles in the peripheral part of the grinding chamber and the amount of interaction between particles and armour plates as well as the number of colliding particles. The perforated sections provide the output of the ground material with the proper size granules, which together with the effects of armour plates, improves the efficiency of grinding. The power demand to rotate the grading device does not exceed the admissible value. (paper)
[en] Here, a recent article [McAlister et al., J. Appl. Phys. 122, 144501 (2017)] claims to show the existence of new'' higher order re-entrant post modes. Indeed, such modes do exist and are known to scientists and engineers for a very long time as modes of a foreshortened quarter-wave coaxial resonator. It is a textbook problem. In this comment, I briefly review the higher order modes in such cavities and provide relevant references.
[en] It is offered the new plasmaoptics device that are representing an elementary plasmaoptics cylindrical cell with the gas discharge of magnetron type in a mode of direct magnetron. Such device can work both in a high-voltage low-current mode and in high-current low-voltage with generation of a plasma torch. The measured rate of etching is about 100...150 nm/min in the low-current high-voltage discharge and on the order rises in high-current mode. Density of torch current up to 3% from density of discharge current and the floating potential up to 0,8 from the anode potential are formed.
[en] This work derives the set of acoustic parameters of a metamaterial for an ideal cylindrical cloak through scattering theory. A multilayered cloak with homogeneous isotropic materials is introduced to approximate the ideal cloak. An active metamaterial, consisting of active arrays of acoustic cavities separated by piezo-diaphragms, is addressed to achieve the required parameters for each layer of the multilayered cloak. In particular, with the aid of a multi-control strategy that takes into account the coupling between adjacent cells, the effective parameters for the cloak can be accurately realized. (paper)
[en] A micro projection lithography process has been implemented using a photomask having arrays of cylindrical or spherical plano-convex microlenses formed by thermal reflow in proximity exposure mode. This approach provides a practical means to generate patterns inside deep cavities without proximity-based pattern size increases. The generated pattern size can be controlled by controlling the focal depth of the microlens. A maximum pattern size reduction of 62% has been achieved at the bottom of a 216 µm deep trench with a cylindrical microlens having a focal length of 254 µm for a 60 µm square pattern. The effect of the microlens on the lithography process, including the relationship between the focal depth, exposure dose and pattern size, has been analyzed. (technical note)
[en] An analytical approach is developed to study the pre- and post-buckling responses of circular cylindrical nanoscale shells subjected to lateral and axial loads as well as thermal environment. The effect of surface free energy as one of the key nanoscale effects is considered in the context of Gurtin-Murdoch surface elasticity theory. The nanoshell is made of functionally graded materials (FGMs) whose properties are calculated using power-law functions. The basic formulation is derived according to the classical shell theory together with the von-Karman nonlinear relations. Moreover, the physical neutral plane position is taken into consideration. Using the Ritz energy method, an analytical approach is also proposed to solve the problem. Comprehensive numerical results are presented to investigate the behavior of nanoshell under lateral pressure and axial load in thermal environment, in pre- and post-buckling domains. The influences of various parameters including the surface stress, FGM gradient index, temperature and geometrical parameters on the non-linear critical axial stress/lateral pressure are illustrated. (paper)
[en] The effect of pre-strain on the stretch flange deformation limit of steel sheets was investigated by hole expansion tests under various pre-strain conditions. Pre-strain was given by stretch forming with a cylindrical punch. The strain ratio and amount of pre-strain were controlled by changing the blank shape and forming height. The hole expansion tests were carried out with a conical punch and cylindrical punch in order to clarify the effect of the strain gradient. The effect of the strain ratio of pre-strain on the stretch flange deformation limit can be expressed by equivalent strain. In the case of higher strain gradients, the stretch flange deformation limit increased with increasing pre-strain. However, at lower strain gradients, the stretch flange deformation limit was almost constant. These results suggest that the formability of the stretch flange deformation area given by pre-strain should be determined from not only the total equivalent strain but also the strain gradient and the amount of pre-strain expressed by equivalent strain. (paper)
[en] A new pattern of hollow cathode effect (H.C.E.) in cylindrjcal geometry by using as cathode two coaxial cylinders is presented. The interior electrode was made of wire sieve of 900 holes/cm2. In the cavity of the interior electrode a simple or aided H.C.E. is produced by electronic injection from the external cylinder. In the case of aided H.C.E. the current and radiation amplification are higher thanin the case of the simple one. (author)