Proceedings of the Scientific-Practical Conference "Research and Development - 2016"

talent management; sensor arrays; automatic speech recognition; dry separation technology; oil production; oil waste; laser technolog

Cumulative index to NASA Tech Briefs, 1986-1990, volumes 10-14

Tech Briefs are short announcements of new technology derived from the R&D activities of the National Aeronautics and Space Administration. These briefs emphasize information considered likely to be transferrable across industrial, regional, or disciplinary lines and are issued to encourage commercial application. This cumulative index of Tech Briefs contains abstracts and four indexes (subject, personal author, originating center, and Tech Brief number) and covers the period 1986 to 1990. The abstract section is organized by the following subject categories: electronic components and circuits, electronic systems, physical sciences, materials, computer programs, life sciences, mechanics, machinery, fabrication technology, and mathematics and information sciences

High-throughput, high-quality laser engraving using nanosecond pulsed fibre lasers

The work presented in this thesis investigates the use of 100 W and 200 W nanosecond pulsed fibre lasers for high-throughput and high-quality engraving of metals. The use of these lasers for most applications is a challenge, owing to laser-induced thermal accumulation within the workpiece. Over the years, researchers have tackled this issue, but focused on ultrashort pulsed lasers, leaving a research gap in terms of nanosecond pulsed lasers, which was the motivation for this thesis. This study features a single line machining technique, to aid understanding of the fundamental laser-material interactions in the high-power nanosecond regime, and to establish a phenomenological model through which an outline parameter space for area engraving can be deduced. Full factorial and Taguchi experimental methods are then used to optimise process parameters during area engraving. The influence of pulse duration, energy dose (i.e. total energy deposited per unit area), pulse repetition frequency, spot size, and laser beam scanning strategies during the engraving of aluminium (5251), brass (508L), and stainless steel (316L) were examined. Analysis of the material removal rate, surface quality, surface elemental composition, and microstructural changes, was conducted using an Alicona surface profilometer, optical microscope, SEM-EDX, and XRD. The study has found that the pulse duration, pulse repetition frequency, spot size, energy dose, and scanning strategies significantly influence process performance. In particular, the use of interlaced laser beam scanning reduces thermal accumulation and offers higher throughput and better surface quality when compared to conventional scanning methods. It was found that there is a trade-off between throughput and surface quality, and hence the optimised parameters will to some extent always depend on the application requirements. Ultimately, this study demonstrates high-throughput, high-quality laser engraving using higher average power pulse tuneable nanosecond fibre lasers, whilst discussing existing challenges and proposing potential remedies

NASA Tech Briefs, Summer 1984

Topics include: NASA TU Services: Technology Utilization services that can assist you in learning about and applying NASA technology. New Product Ideas: A summary of selected innovations of value to manufacturers for the development of new products; Electronic Components and Circuits; Electronic Systems; Physical Sciences; Materials; Life Sciences; Mechanics; Machinery; Fabrication Technology; Mathematics and Information Science

Experimental and Numerical Investigations in Shallow Cut Grinding by Workpiece Integrated Infrared Thermopile Array

The purpose of our study is to investigate the heat distribution and the occurring temperatures during grinding. Therefore, we did both experimental and numerical investigations. In the first part, we present the integration of an infrared thermopile array in a steel workpiece. Experiments are done by acquiring data from the thermopile array during grinding of a groove in a workpiece made of steel. In the second part, we present numerical investigations in the grinding process to further understand the thermal characteristic during grinding. Finally, we conclude our work. Increasing the feed speed leads to two things: higher heat flux densities in the workpiece and higher temperature gradients in the material

NASA Tech Briefs, Fall 1985

Topics include: NASA TU Services; New Product Ideas; Electronic Components and Circuits; Electronic Systems; Physical Sciences; Materials; Life Sciences Mechanics; Machinery; Fabrication Technology; Mathematics and Information Sciences

NASA Tech Briefs, Summer 1985

Topics include: NASA TU Services; New Product Ideas; Electronic Components and Circuits; Electronic Systems; Physical Sciences; Materials; Life Sciences; Mechanics; Machinery; Fabrication Technology; Mathematics and Information Sciences

Cumulative index to NASA Tech Briefs, 1970-1975

Tech briefs of technology derived from the research and development activities of the National Aeronautics and Space Administration are presented. Abstracts and indexes of subject, personal author, originating center, and tech brief number for the 1970-1975 tech briefs are presented