A restrictive analysis based on a new model is presented for the prediction of thermal contact resistance in vacuum environment. It demonstrated that, many surfaces commonly encountered engineering practice, macroscopic constriction has commanding influence. Extensive results are given brass, magnesium, stainless steel, and aluminum which show effects material properties degree conformity mating under load. Limited to influence surface films, roughness, creep, additional interstitial...

Emerging spatial computing systems seamlessly superimpose digital information on the physical environment observed by a user, enabling transformative experiences across various domains, such as entertainment, education, communication and training

Abstract Measurements of solids motion in a fluidized bed have been made computer‐aided particle tracking facility. A radioactive tracer particle, dynamically identical to the solid particles be studied, was mixed with bed. The gamma radiation from continuously monitored by large number scintillation detectors located around bed, providing information on tracer's instantaneous location. Prudent use purposely introduced redundant distance data achieve improved accuracy. recognition existence...

The mechanics of vapor bubble collapse under spherically symmetrical conditions is examined to ascertain the relative importance effects liquid inertia and heat transfer on rate. A dimensionless parameter, Beff, identified characterize mode collapse. Discriminating values this parameter are suggested for simple case where initiated by a step change in pressure or temperature. For controlled collapse, model also proposed account influence permanent gas present bubble. Experimental results...

Abstract This paper presents an analytical method for the determination of metal-cutting temperatures. The average tool-chip interface temperature is calculated by considering mechanism heat generation during operations in which a type 2 chip formed. results agree well with those obtained test methods, and theoretical analysis has also yielded some important physical quantities measurements affect cutting

An analysis is made for the transient response behavior of thermal or concentration boundary layers a fluid sphere moving at constant velocity with internal circulation in another large extent under condition Reynolds and Peclet numbers. The disturbance initiated by step change temperature solute either continuous disperse region fluids. governing energy mass conservation equations are solved using similarity transformations. result shows that growth independent properties but governed...

The collapse of vapor bubbles in a subcooled liquid is studied under conditions that heat transfer the controlling mechanism. Emphasis placed on effect translatory motion and presence noncondensable gas rate. governing conservation equations are cast into appropriate dimensionless forms, numerical solutions presented for bubble history with Jakob number, Pe´clet persistent radius as parameters. predicted behavior agrees satisfactorily experimental data which cover ranges number from 7 to 45,...

A rapid computation procedure is described for the prediction of heat transfer in laminar free convection boundary layers, either two-dimensional or axisymmetrical, over isothermal smooth objects with fairly arbitrary shape. The analysis employs suitable coordinate transformation which makes it possible to express solutions governing conservation equations terms a sequence universal functions that depend on fluid Prandtl number and configuration function. latter completely determined by body...

An analysis is presented for the unsteady laminar, forced-convection heat transfer at a two-dimensional and axisymmetrical front stagnation due to an arbitrarily prescribed wall temperature or flux variation. The flow incompressible steady. procedure begins with consideration of thermal boundary-layer response caused by either step change in surface flux. Two appropriate asymptotic solutions, valid small large times, respectively, are found satisfactorily joined Prandtl numbers ranging from...

Abstract A rapid, iterative method is presented for computing the distribution of temperature at tool-chip interface. Calculation shows that maximum occurs a point near trailing edge contact when chips are produced conventional feeds and speeds with sintered-carbide tools. The heat-flux interface also obtained. analysis reveals that, under usual conditions, heat being conducted from tool into chip over small region close to cutting edge. It has been found thermal conductivity material only...

Abstract This paper presents an analysis of tool-wear data in terms fundamental variables consistent with the nature contact and rubbing clean metallic surfaces. Wear cemented-carbide tools on top surface is examined light mechanism frictional wear as proposed originally by Holm recently modified Burwell, Strang, Archard. It has been found that at essentially transfer type formation crater strongly temperature-dependent. For a given tool-work combination, face can be correlated tool-chip...

Covers advancements in spacecraft and tactical strategic missile systems, including subsystem design application, mission analysis, materials structures, developments space sciences, processing manufacturing, operations, applications of technologies to other fields.

To rectify fisheye distortion from a single image, we advance self-supervised learning strategies and propose unique deep model of Fisheye GAN (FE-GAN). Our FE-GAN learns pixel-level flow sets distorted images distortion-free ones (but not requiring such correspondences), with cross-rotation intra-warping consistency introduced. With novel techniques, our FEGAN is able to recover the image directly input. experiments quantitatively qualitative confirm effectiveness robustness proposed model,...

The measurement of temperature distribution at the flank surface a cutting tool is characterized by extremely small extent over which field explored. This paper describes technique makes use moving lead-sulfide, photoconductive, infrared radiation detector. in question quickly scanned detector’s view field. For level encountered, data are reproducible and method may be used to determine sliding contacts general. From measured temperatures, tool-chip interface was deduced using geometrical,...

Abstract The theoretical analysis of heat flow in conjunction with cutting data high-speed orthogonal metal-machining operations reveals that, for a given tool rake, the temperature distribution along shear plane is solely dependent on thermal number, Vct/k. An explanation offered difference chip curvature as conditions are changed. Further significance number metal machining presented.

When the cutting speed or feed of a metal tool is increased, most striking effect on rate wear, but there are other changes which take place at same time. These in geometry chip, forces, and build-up surface finish. An attempt made this paper to form logical theory explain these variations mechanics process. The problem wear not attempted. A series tests has been conducted mild steel copper, over wide range speed, feed, angle; developed. results arrived are:— (1) That local temperature chip...

We propose a holographic projection system that achieves high image quality, brightness, and light efficiency. Using novel, to the best of our knowledge, light-efficiency loss function, we are able concentrate more on region improve display brightness compared with conventional projectors. Leveraging emerging artificial intelligence-driven computer-generated holography camera-in-the-loop calibration techniques, learn wave propagation model using experimentally captured images demonstrate...