Laser technology

This article presents a breakthrough in the field of laser engraving from the perspective of polar coordinates. The system has applied scientific and technical principles to the automation of production, enhancing productivity, and reducing human labor.

9p viengfa 28-10-2024 5 2   Download

The objectives of the present study are: Justifying the possibility of using laser cladding technology as a repair method for refurbishment of worn railway axles without jeopardizing their fatigue properties; Analysis of crack initiation and propagation in laser clad samples.

130p runthenight07 01-03-2023 6 3   Download

Continuing from part 1, part 2 of the textbook English for mechanical engineering presents the remaining content as follows: lasers, corrosion, plastic injection molding, welding technology, computer integrated manufacturing, special machining technologies, applying for a Job. We invite you to consult!

64p gaogao2708 21-04-2022 41 14   Download

The intelligent vehicle system is the primary trend in the development of modern transportation. This paper introduces several kinds of ranging technology used in smart transportation, such as the existing ultrasonic ranging, millimeter-wave radar going, laser ranging, machine vision running, etc. Firstly, the development status is explained. Secondly, the principle is elaborated. Next, their performance is analyzed and compared. Finally, we introduce the development trend of vehicle ranging technology.

7p linyanjun_2408 21-04-2022 13 4   Download

The results show that ultimate strength under static loading can not be used as a quality criterion for zirconium alloys welds. Increased shielding gas flow rate does not allow to protect weld metal totally and contributes to defect formation without using special nozzles. Several types of imperfections of the welds have been found, but the major problem is branching microcracks on the surface of the welds.

8p minhxaminhyeu3 12-06-2019 18 0   Download

Why to deal with lasers? Lasers are used for medical applications Lasers may be the key part for future power plants (fusion reactors) tubes contain the laser beams 1 ns pulse duration, 45 kJ/pulse, 100 TW peak power Lawrence-Livermore Laboratory, USA, National Ingnition Facilty, NOVA laser system Lasers are a key part of todays consumer electronics, telecommunication, and computer technology Digital Video Disk (DVD)

71p dq_vinh 24-10-2012 126 37   Download

 Infrared (IR) Spectroscopy: – First real IR spectra measured by Abney and Festing in 1880’s – Technique made into a routine analytical method between 1903- 1940 (especially by Coblentz at the US NBS) – IR spectroscopy through most of the 20th century is done with dispersive (grating) instruments, i.e. monochromators – Fourier Transform (FT) IR instruments become common in the 1980’s, led to a great increase in sensitivity and resolution  Raman Spectroscopy: – In 1928, C. V. Raman discovers that small changes occur the frequency of a small portion of the light scattered by molecules.

31p qdung92ct 03-07-2012 96 10   Download

Analytical chemists work to improve the reliability of existing techniques to meet the demands of for better chemical measurements which arise constantly in our society They adapt proven methodologies to new kinds of materials or to answer new questions about their composition. They carry out research to discover completely new principles of measurements and are at the forefront of the utilization of major discoveries such as lasers and microchip devices for practical purposes.

24p qdung92ct 03-07-2012 60 4   Download

LIF (laser-induced fluorescence) is a very popular CE detector – These have ~0.01 attomole sensitivity for fluorescent molecules (e.g. derivatized proteins). Direct absorbance (UV-Vis) can be used for organics. For inorganics, indirect absorbance methods are used instead, where a absorptive buffer (e.g. chromate) is displaced by analyte ions – Detection limits are in the 50-500 ppb range. Alternative methods involving potentiometric and conductometric detection are also used – Potentiometric detection: a broad-spectrum ISE – Conductometric detection: like IC...

21p qdung92ct 03-07-2012 64 6   Download

Introduction to LEDs: How LEDs work + some points. Comparison with other sources of light. LED in communication. Blue &White LED technologies. How they are made? Their application? Brief about blue laser? Stands for light emitting diode. Semiconductor device: p-n junction forward-biased.current emits incoherent narrow spectrum light (due to recombination in transition region near the junction.) Color of the emitted light depends on the chemical of the semiconducting material used. (Near-ultraviolet, visible or infrared.)...

52p lehieukutek 26-12-2009 217 135   Download