scholarly journals Anti-Reflection Nanostructures on Tempered Glass by Dynamic Beam Shaping

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 289
Author(s):  
Petr Hauschwitz ◽  
Jan Brajer ◽  
Danijela Rostohar ◽  
Jaromír Kopeček ◽  
Tomáš Mocek ◽  
...  
Keyword(s):  
Mobile Phones ◽  
Thermal Damage ◽  
Pulsed Laser ◽  
Processing Parameters ◽  
Beam Shaping ◽  
Separation Distance ◽  
Tempered Glass ◽  
Fundamental Wavelength ◽  
Speed Up ◽  
Scanning Head

Reflectivity and surface topography of tempered glass were modified without any thermal damage to the surroundings by utilizing 1.7 ps ultrashort pulsed laser on its fundamental wavelength of 1030 nm. To speed up the fabrication, a dynamic beam shaping unit combined with a galvanometer scanning head was applied to divide the initial laser beam into a matrix of beamlets with adjustable beamlets number and separation distance. By tuning the laser and processing parameters, reflected intensity can be reduced up to 75% while maintaining 90% of transparency thus showing great potential for display functionalization of mobile phones or laptops.

The whole can be very much less than the sum of its parts

2019 ◽  
Vol 103 (556) ◽  
pp. 117-127
Author(s):  
Peter Shiu
Keyword(s):  
Signal Processing ◽  
Fourier Transform ◽  
Mr Imaging ◽  
Fast Fourier Transform ◽  
Data Compression ◽  
Mobile Phones ◽  
Processing Data ◽  
Speed Up ◽  
Indispensable Tool ◽  
Computing Machines

This Article is on the discrete Fourier transform (DFT) and the fast Fourier transform (FFT). As we shall see, FFT is a slight misnomer, causing confusion to beginners. The idiosyncratic title will be clarified in §4.Computing machines are highly efficient nowadays, and much of the efficiency is based on the use of the FFT to speed up calculations in ultrahigh precision arithmetic. The algorithm is now an indispensable tool for solving problems that involve a large amount of computation, resulting in many useful and important applications: for example, in signal processing, data compression and photo-images in general, and WiFi, mobile phones, CT scanners and MR imaging in particular.

Modeling Short-Range Interactions in Concentrated Newtonian Fiber Bundle Suspensions

2021 ◽  
Vol 36 (3) ◽  
pp. 255-263
Author(s):  
N. Meyer ◽  
A. N. Hrymak ◽  
L. Kärger
Keyword(s):  
Short Range ◽  
Development Process ◽  
Contact Point ◽  
Separation Distance ◽  
Fiber Bundles ◽  
Fiber Architecture ◽  
Simulation Framework ◽  
Transient Rheology ◽  
Speed Up ◽  
Cost Efficient

Abstract Sheet Molding Compounds (SMC) offer a cost efficient way to enhance mechanical properties of a polymer with long discontinuous fibers, while maintaining formability to integrate functions, such as ribs, beads or other structural reinforcements. During SMC manufacturing, fibers remain often in a bundled configuration and the resulting fiber architecture determines part properties. Accurate prediction of this architecture by simulation of flow under consideration of the transient rheology and transient fiber orientations can speed up the development process. In particular, the interaction of bundles is of significance to predict molding pressures correctly in a direct simulation approach, which resolves individual fiber bundles. Thus, this work investigates the tangential short-range lubrication forces between fiber bundles with analytical and numerical techniques. A relation between the effective sheared gap between bundles and the bundle separation distance at the contact point is found and compared to experimental results from literature. The result is implemented in an ABAQUS contact subroutine to incorporate short-range interactions in a direct bundle simulation framework.

scholarly journals Characterization of Ablated Bone and Muscle for Long-Pulsed Laser Ablation in Dry and Wet Conditions

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1338 ◽  
Author(s):  
Nguendon Kenhagho ◽  
Shevchik ◽  
Saeidi ◽  
Faivre ◽  
Meylan ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Thermal Damage ◽  
Pulsed Laser ◽  
Principal Component ◽  
Classification Error ◽  
Ablation Efficiency ◽  
Mahalanobis Distances ◽  
Dry Conditions ◽  
Fast Healing

Smart laser technologies are desired that can accurately cut and characterize tissues, such as bone and muscle, with minimal thermal damage and fast healing. Using a long-pulsed laser with a 0.5–10  ms pulse width at a wavelength of 1.07  µm, we investigated the optimum laser parameters for producing craters with minimal thermal damage under both wet and dry conditions. In different tissues (bone and muscle), we analyzed craters of various morphologies, depths, and volumes. We used a two-way Analysis of Variance (ANOVA) test to investigate whether there are significant differences in the ablation efficiency in wet versus dry conditions at each level of the pulse energy. We found that bone and muscle tissue ablated under wet conditions produced fewer cracks and less thermal damage around the craters than under dry conditions. In contrast to muscle, the ablation efficiency of bone under wet conditions was not higher than under dry conditions. Tissue differentiation was carried out based on measured acoustic waves. A Principal Component Analysis of the measured acoustic waves and Mahalanobis distances were used to differentiate bone and muscle under wet conditions. Bone and muscle ablated in wet conditions demonstrated a classification error of less than 6.66 % and 3.33 %, when measured by a microphone and a fiber Bragg grating, respectively.

An Experimental Approach to Continuous Dieless Wire Drawing (Variant A) Using ELI Ti–6Al–4V Alloy

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
M. D. Naughton ◽  
P. Tiernan
Keyword(s):  
Surface Oxidation ◽  
Processing Parameters ◽  
Wire Drawing ◽  
Separation Distance ◽  
Successful Operation ◽  
Cross Sectional ◽  
Stress Cracking ◽  
Heating And Cooling ◽  
Cooling Devices ◽  
The Wire

This research paper describes a specifically constructed Variant A continuous dieless wire-drawing machine to experimentally determine the principal processing parameters for dieless wire drawing using extra low interstitial Ti–6Al–4V wire alloy. It was experimentally determined that the process was limited by the ratio of the ingoing and outgoing axial velocities, also known as the reduction ratio R and influenced by the primary drawing velocity V1. Reductions of up to 36% per pass wire in cross-sectional area (CSA) were achieved. However, a direct relationship between the wire diameter variation and an increase in overall achievable reduction in CSA was observed. The separation distance between the wire heating and cooling devices (S) was identified as one of the principal governing process parameters. It was found that processing in an inert gas environment led to an increased reduction on CSA of approximately 3% per pass when compared with processing in compressed air. This was attributed to a reduction in surface oxidation and stress cracking. The experimentally determined results showed excellent agreement with a proposed mathematical model. It was also determined that the calculated strain rate for the process fell within the boundaries of previously determined strain rates for this particular alloy. The successful operation of this experimental machine effectively illustrates the possible commercial validity of continuous dieless wire drawing.

Effect of processing parameters on the properties of hydroxylapatite films grown by pulsed laser deposition

1995 ◽  
Vol 257 (1) ◽  
pp. 125-129 ◽  
Author(s):  
M. Jelínek ◽  
V. Olsˇan ◽  
L. Jastrabík ◽  
V. Studnicˇka ◽  
V. Hnatowicz ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Processing Parameters ◽  
Laser Deposition

Pulsed Laser Deposition of Epitaxial (110) Tin Films on (100) Gaas - Processing, Characterization and Modeling

1993 ◽  
Vol 317 ◽  
Author(s):  
Tsvetanka Zheleva ◽  
K. Jagannadham ◽  
N. Biunno ◽  
J. Narayan
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Processing Parameters ◽  
Laser Deposition ◽  
Room Temperature Resistivity ◽  
X Ray Diffraction ◽  
Tin Films ◽  
Transmission Electron ◽  
Crystal Films ◽  
Relationship Of

ABSTRACTEpitaxial (110) titanium nitride films have been grown on (100) GaAs by pulsed laser deposition technique. The film quality has been found to be a strong function of the processing parameters. The films have been characterized using four point probe resistivity technique, Raman spectroscopy, X-ray diffraction analysis, and transmission electron Microscopy. Single crystal films were obtained at the deposition temperature 450° C and the room temperature resistivity was found to be 49.7 ΜΩ-cm. The epitaxial orientation relationship of the TiN films with the substrate is given by [001]TiN//[110] GaAs and [īlO]TiN// [līO]GaAs. Modeling studies have been performed to characterize the domain epitaxial growth in these large mismatch systems.

THE APPLICATION OF PULSED LASER DEPOSITION IN PRODUCING BIOACTIVE CERAMIC FILMS

2005 ◽  
Vol 12 (03) ◽  
pp. 401-408 ◽  
Author(s):  
YAFAN ZHAO ◽  
CHUANZHONG CHEN ◽  
DIANGANG WANG
Keyword(s):  
Thin Films ◽  
Substrate Temperature ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Processing Parameters ◽  
Laser Wavelength ◽  
Laser Deposition ◽  
Future Application ◽  
Ceramic Films ◽  
Bioactive Ceramic

Pulsed laser deposition (PLD) is a relatively new technique for producing thin films. It presents unique advantages for the deposition of bioactive ceramics. The mechanism and characteristics of the technique PLD are introduced. Its applications and current research status in hydroxyapatite and bioglass thin films are reviewed. The effect of processing parameters of PLD, including atmosphere, substrate temperature, laser wavelength and target properties, on the structures and the properties of the hydroxyapatite film, is analyzed in detail. Future application trends are also analyzed.

scholarly journals NFC Solutions for Purchasing Public Transport Tickets at Babahoyo Terrestrial Terminal

2018 ◽  
Vol 3 (CITT2017) ◽  
pp. 50-55
Author(s):  
José Rosado Anzules ◽  
Wander Lindao Uchubanda ◽  
Angel Villagomez Gurumendi ◽  
Nelly Esparza Cruz
Keyword(s):  
Computer System ◽  
Mobile Phones ◽  
Exploratory Study ◽  
Positive Impact ◽  
High Impact ◽  
Qualitative And Quantitative ◽  
The People ◽  
Speed Up ◽  
Purchase Process ◽  
Quantitative Nature

Buying tickets at the Babahoyo terrestrial terminal can become a slow process, causing delays and costs for users to queue to be able to mobilize to the different destinations on o er. The objective of the project is to demonstrate the feasibility of using the computer system that implements NFC technology through mobile phones and smart cards that allow to speed up the purchase process, all for frequent travelers who must use this service. The data presented in this article were obtained through an exploratory study of qualitative and quantitative nature. The people who participated in the study were the users of the Babahoyo terrestrial terminal transport, who answered questions to determine their level of acceptance to a computer system using NFC technologies and the results determined that a large majority were available to use telephones and smart card readers. About 90% of respondents believe that the software will have a positive impact on the ticketing process at the Babahoyo terrestrial terminal. Even in the country, the advantages of NFC have not been seen, however, it is expected that by 2018 will have a high impact by the use of applications that make use of the benefits provided by this technology. NFC technology emerged about 15 years ago, however, in Ecuador has not yet become popular the use of it.

scholarly journals Perancangan Prototipe Aplikasi Customer Relationship Management (CRM) Berbasis SMS Gateway Untuk Mendukung Proses Penyetaraan Mahasiswa Pada Universitas Budi Luhur

2019 ◽  
Vol 1 ◽  
pp. 54
Author(s):  
Nofiyani Nofiyani ◽  
Yesi Puspita Dewi
Keyword(s):  
Mobile Phones ◽  
Customer Relationship Management ◽  
Research Methodology ◽  
Private Universities ◽  
Relationship Management ◽  
Customer Relationship ◽  
Easy Access ◽  
Access To Information ◽  
Communication Devices ◽  
Speed Up

The company began to aware potential sectors that could maintain and even increase revenue. So that, staying in touch with customers become serious point at Budi Luhur University, which is one of the private universities in Jakarta. Therefore various efforts made so that customer has good relations with the company. The solution is providing easy access to information using communication devices in the form of mobile phones, especially in the process of “penyetaraan mahasiswa”. Writer applies the Customer Relationship Management (CRM) approach which aims to convey information to customers more efficiently by using communication devices. The design of the system is based on the SMS gateway that become bridge between handphone and the SMS server. Based on the research methodology, the design of an SMS gateway-based system is obtained, so that it can help simplify and speed up the delivery of information about the timeline and checkpoint progress of “penyetaraan mahasiswa”.

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