Additive manufacturing (AM) has emerged as a very promising technique for creating highly complex and customized solid structures on the basis of digital models. AM successively joins layers of material of different shapes to form a finished part Numerous variants of this technique have been proposed over the past years. One special additive manufacturing process able to produce load bearing pa...

STATEMENT OF PROBLEM Cobalt-chromium (Co-Cr) alloys have been widely used for metal-ceramic fixed prostheses and can be fabricated using conventionally cast or new computer-aided technology. However, the effect of different manufacturing methods on the metal-ceramic bond strength needs further evaluation. PURPOSE The purpose of this in vitro study was to evaluate the metal-ceramic bond streng...

The selective laser melting (SLM) of aluminium alloys is of great current interest at both the industrial and research levels. Aluminium poses a challenge to SLM compared with other candidate materials, such as titanium alloys, stainless steels, and nickel-based alloys, because of its high thermal diffusivity and low infrared absorptivity and tendency to result in relatively porous parts. Howev...

Copper alloys, combined with selective laser melting (SLM) technology, have attracted increasing attention in aerospace engineering, automobile, and medical fields. However, there are some difficulties in SLM forming owing to low laser absorption and excellent thermal conductivity. It is, therefore, necessary to explore a copper alloy in SLM. In this research, manufacturing feasibility and form...

Thepeak to avemgepwer ratio (PAPR) dishihtion of the @odic orihogonnlfi.quency division multiplexing (OFDM) dain symbol sequence is ewluated and it is shown t h a the OFDM data symbol sequence with short period is wpcted to have high PAPR. Using this result, we identr& the optimal phase sequence set and pmpse mws of a cyclic Hndamard mahu. comtrucfed by msequence as phase sequences for selected...

It is known that in the selected mapping (SLM) scheme for orthogonal frequency division multiplexing (OFDM), correlation (CORR) metric outperforms the peak-to-average power ratio (PAPR) metric in terms of bit error rate (BER) performance. It is also well known that four times oversampling is used for estimating the PAPR performance of continuous OFDM signal. In this paper, the oversampling effe...

Adaptive optics is used to compensate for modal dispersion in digital transmission through multimode fiber (MMF). At the transmitter, a spatial light modulator (SLM) controls the launched field pattern. An estimate of intersymbol interference (ISI) caused by modal dispersion is formed at the receiver and fed back to the transmitter, where the SLM is adjusted to minimize ISI. Error-free transmis...

This paper presents performance analysis of Peak to Average Power Ratio (PAPR) Reduction techniques in Orthogonal Frequency Division Multiplexing (OFDM) System such as Clipping, Partial Transmit Sequence (PTS), Selective Mapping (SLM) and SLM with Clipping (Hybrid Scheme) .Complementary Cumulative Distribution Function (CCDF) is calculated for each technique with different number of sub carrier...

We have combined a spatial light modulator (SLM) and galvanometer-mounted mirrors into an optical tweezers set-up. This provides great flexibility by allowing us to create an array of traps which can be moved in a smooth and fast way. To optimise the performance we investigated the effect of incidence angle on the SLM with respect to phase and intensity response. Although it is possible to use ...

In this work, a novel single-longitudinal-mode (SLM) four-wavelength laser configuration for sensing applications in L-band is proposed and experimentally demonstrated. This spectral region presents some advantages for the detection of dangerous gases. The sensor system presented here is based on ring resonators, and employs fiber Bragg gratings to select the operation wavelengths. The stable S...