High-capacity and high-speed DWDM and NWDM optical devices for telecom and datacom applications

2001 ◽  
Author(s):  
Joseph C. Chon ◽  
Benjamin B. Jian ◽  
Jerry R. Bautista
Keyword(s):  
High Speed ◽  
High Capacity ◽  
Optical Devices

scholarly journals Prototype Design and Experimental Evaluation of Autonomous Collaborative Communication System for Emerging Maritime Use Cases

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3871
Author(s):  
Jiri Pokorny ◽  
Khanh Ma ◽  
Salwa Saafi ◽  
Jakub Frolka ◽  
Jose Villa ◽  
...  
Keyword(s):  
Communication System ◽  
Autonomous Vehicles ◽  
High Speed ◽  
High Capacity ◽  
Workplace Safety ◽  
Unmanned Vehicles ◽  
Use Cases ◽  
Automated Systems ◽  
Collaborative Communication ◽  
Wide Range

Automated systems have been seamlessly integrated into several industries as part of their industrial automation processes. Employing automated systems, such as autonomous vehicles, allows industries to increase productivity, benefit from a wide range of technologies and capabilities, and improve workplace safety. So far, most of the existing systems consider utilizing one type of autonomous vehicle. In this work, we propose a collaboration of different types of unmanned vehicles in maritime offshore scenarios. Providing high capacity, extended coverage, and better quality of services, autonomous collaborative systems can enable emerging maritime use cases, such as remote monitoring and navigation assistance. Motivated by these potential benefits, we propose the deployment of an Unmanned Surface Vehicle (USV) and an Unmanned Aerial Vehicle (UAV) in an autonomous collaborative communication system. Specifically, we design high-speed, directional communication links between a terrestrial control station and the two unmanned vehicles. Using measurement and simulation results, we evaluate the performance of the designed links in different communication scenarios and we show the benefits of employing multiple autonomous vehicles in the proposed communication system.

Silicon-based nonlinear optical devices for high-speed optical communications

2008 ◽  
Author(s):  
Haisheng Rong ◽  
Simon Ayotte ◽  
Shengbo Xu ◽  
Oded Cohen ◽  
Mario Paniccia
Keyword(s):  
Optical Communications ◽  
High Speed ◽  
Nonlinear Optical ◽  
Optical Devices ◽  
Nonlinear Optical Devices ◽  
Silicon Based

scholarly journals Nanoprinted high-neuron-density optical linear perceptrons performing near-infrared inference on a CMOS chip

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Elena Goi ◽  
Xi Chen ◽  
Qiming Zhang ◽  
Benjamin P. Cumming ◽  
Steffen Schoenhardt ◽  
...  
Keyword(s):  
Machine Learning ◽  
High Speed ◽  
Near Infrared ◽  
Single Layer ◽  
Infrared Region ◽  
Optical Devices ◽  
Medical Diagnostics ◽  
Oxide Semiconductor ◽  
Process Data ◽  
Neuron Density

AbstractOptical machine learning has emerged as an important research area that, by leveraging the advantages inherent to optical signals, such as parallelism and high speed, paves the way for a future where optical hardware can process data at the speed of light. In this work, we present such optical devices for data processing in the form of single-layer nanoscale holographic perceptrons trained to perform optical inference tasks. We experimentally show the functionality of these passive optical devices in the example of decryptors trained to perform optical inference of single or whole classes of keys through symmetric and asymmetric decryption. The decryptors, designed for operation in the near-infrared region, are nanoprinted on complementary metal-oxide–semiconductor chips by galvo-dithered two-photon nanolithography with axial nanostepping of 10 nm1,2, achieving a neuron density of >500 million neurons per square centimetre. This power-efficient commixture of machine learning and on-chip integration may have a transformative impact on optical decryption3, sensing4, medical diagnostics5 and computing6,7.

Ultrafast optical devices for high-speed optical data links

1999 ◽  
Author(s):  
Todd G. Ulmer ◽  
Michael C. Gross ◽  
William S. Astar ◽  
Paul W. Juodawlkis ◽  
Barbara R. Washburn ◽  
...  
Keyword(s):  
High Speed ◽  
Optical Devices ◽  
Optical Data ◽  
Ultrafast Optical ◽  
Data Links

Remote Monitoring and Failure Diagnosis for a Microturbine Cogeneration System

2007 ◽  
Author(s):  
Tadashi Kataoka ◽  
Tadahiko Kishikawa ◽  
Shigeru Sakata ◽  
Takahiro Nakagawa ◽  
Jun Ishiguro
Keyword(s):  
Remote Monitoring ◽  
High Speed ◽  
High Capacity ◽  
Failure Detection ◽  
Failure Diagnosis ◽  
Remote Monitoring System ◽  
Cogeneration System ◽  
Trend Data ◽  
High Speed Data Acquisition ◽  
Detection And Diagnosis

This paper presents the implementation of failure detection and diagnosis, and predictive maintenance for a microturbine cogeneration system. It also introduces a remote monitoring system with capabilities for high-capacity high-speed data acquisition and storage, as well as data sharing via the Internet. Additionally, this paper provides failure diagnosis that uses high-speed transient data in order to determine the root cause of microturbine emergency shutdown or start failure, as well as failure prediction that uses long-range trend data in order to carry out the appropriate maintenance with some examples.

Needle Fatigue Analysis for High-Speed Knitting Machines

1995 ◽  
Author(s):  
Richard H. Lyon ◽  
Leonid M. Malinin
Keyword(s):  
High Speed ◽  
Transfer Functions ◽  
High Capacity ◽  
Time History ◽  
Stationary Problem ◽  
Element Analysis ◽  
Speed Increase ◽  
Design Engineers ◽  
Machine Element ◽  
Needle Longevity

Abstract In modern, high capacity circular knitting machines, the small and fragile latch needles are often a performance-limiting machine element (Schuler, 1980). For these machines, the operating circumferential speed may exceed 1.5 m/sec. Due to the kinematics of the process, the cam driven needles are exposed to periodic excitation with frequency proportional to the speed. Increase in rotational speed gives rise to needle head fatigue breakages unless special design measures are undertaken. Frequencies up to 15 kHz have been observed and up to 60 kHz may be expected in the vibration spectrum. To understand what particular features of needle design may be responsible for their longevity, several techniques were developed to apply Finite Element Analysis software to estimating the fatigue life under a non-harmonic periodic loading. The known FEA packages handle dynamics of a system with such loading as a general non-stationary problem, whereas much more efficient solution can be constructed by combining the analytical solution for a one DOF system under recurring impulses (5-functions of amplitude A) at the moments 0, T, 2T, …, and the natural modes of the system (with the driving point fixed) provided by FEA. As applied to the system in question, from the broad frequency range of the excitation forces and displacements, only frequencies close to those providing maxima to the transfer functions from the driving point to the head of the needle were selected. These frequencies are referred to further on as the response frequencies. Then the time history simulating polyharmonic stresses in the dangerous area was generated and processed according to the chosen fatigue criteria (a corrected linear hypothesis of damage summation, see below). Thus for any given node of the needle a point on the S-N diagram was obtained. A wide spread desktop package, ALGOR, was selected as a Linear Stress Analysis solver. The described procedure is built on top of this package and allows design engineers to make judgements as to what design is more advantageous for needle longevity.

scholarly journals High-Speed and High-Capacity Removal of Methyl Orange and Malachite Green in Water Using Newly Developed Mesoporous Carbon: Kinetic and Isotherm Studies

ACS Omega ◽  
2019 ◽  
Vol 4 (21) ◽  
pp. 19293-19306 ◽  
Author(s):  
Imran Ali ◽  
Irina Burakova ◽  
Evgeny Galunin ◽  
Alexandr Burakov ◽  
Elina Mkrtchyan ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Malachite Green ◽  
Mesoporous Carbon ◽  
High Speed ◽  
High Capacity

scholarly journals New insight into cavitation mechanisms in high-capacity tensiometers based on high-speed photography

2013 ◽  
Vol 50 (5) ◽  
pp. 550-556 ◽  
Author(s):  
J. Mendes ◽  
O. Buzzi
Keyword(s):  
High Speed ◽  
Soil Mechanics ◽  
Full Range ◽  
High Capacity ◽  
Water Reservoir ◽  
Bubble Nucleation ◽  
High Speed Photography ◽  
Small Water ◽  
Unsaturated Soil Mechanics ◽  
Large Water

The high-capacity tensiometer developed by Ridley and Burland in 1993 is a milestone in experimental unsaturated soil mechanics. This device, which relies on development of tension in an enclosed water body, permits direct measurement of negative water potential. Many tensiometers have been built since 1993, all being based on the same principle although the design may differ slightly from the original. In particular, the common characteristic is a very small water reservoir that is believed to be the location of bubble nucleation, a phenomenon referred to as cavitation that impedes the sensor from functioning properly. Many have studied cavitation and different explanations or cavitation mechanisms have been proposed. However, all the considerations put forward were derived without being able to capture what happened inside the water reservoir at cavitation. This is now achieved with the new tensiometer specifically designed to “see” inside the water reservoir during suction measurement. For the first time, cavitation has been captured via high-speed photography and the mechanisms of cavitation can be explained using physical evidence. The first outcome is that it is possible for a high-capacity tensiometer to function to its full range with a large water reservoir. Then, the analysis of high-speed photographs reveals that the bubbles triggering cavitation are nucleated in the ceramic and make their way to the water reservoir. Cavitation occurs only when the air phase reaches the water reservoir.

scholarly journals Evaluating Alternative Seed-Cotton Reclaimers for High-Speed Roller Ginning

2020 ◽  
Vol 36 (3) ◽  
pp. 245-256
Author(s):  
Carlos B. Armijo ◽  
Derek P. Whitelock ◽  
Paul A. Funk ◽  
Joe W. Thomas
Keyword(s):  
Upland Cotton ◽  
High Speed ◽  
High Capacity ◽  
Seed Storage ◽  
List Type ◽  
Seed Cotton ◽  
Seed Loss ◽  
Pima Cotton ◽  
Full Speed ◽  
In Series

HighlightsExperimental high-capacity seed-cotton reclaimers were evaluated for the growing high-speed roller-ginning industry.The experimental reclaimers minimized the amount of seed-cotton loss compared to the conventional reclaimer, but had more seed loss than a conventional reclaimer.The conventional reclaimer had the lowest combined seed and lint loss when processing Pima cotton.An experimental reclaimer based on a current cotton gin machine had seed and lint losses nearly $10 per cotton bale less than the conventional reclaimer when processing Upland cotton.Abstract. In a roller ginnery, a reclaimer machine removes partially-ginned or unginned seed cotton (carryover) from the mixture of carryover and ginned cottonseed that is expelled from the roller-gin stand during operation and returns the carryover to the gin stand for re-ginning. Conventional seed-cotton reclaimers are marginally adequate in their capacity to handle the increased carryover that high-speed roller ginning produces. Overloading a reclaimer often leads to choke-ups and downtime for the ginnery. The objective of this study was to develop and test high-capacity reclaimers. A modified 3-saw cylinder stick machine and a modified 2-saw cylinder gin-stand feeder were tested and compared to a conventional reclaimer. The saw-cylinders in the modified machines were operated at standard full speed, 1/2 of full speed, and 3/4 of full speed. Both Pima and Upland cotton were included in this study because there is a sizable amount of roller-ginned Upland cotton. Results showed that the experimental reclaimers reclaimed more carryover than the conventional reclaimer. An effective reclaimer will 1) reclaim carryover without also capturing residual seed that will likely be removed with cotton trash when returned to the gin stand feeder (seed loss) and 2) allow seed to pass through to the seed storage while minimizing the amount of residual carryover that escapes with the seed (carryover loss). The experimental reclaimers minimized the amount of residual carryover loss, but they had more residual seed loss than the conventional reclaimer. Increasing the saw-cylinder speeds of the experimental reclaimers decreased the residual seed loss but increased the residual carryover loss. Estimates of the value of the lost seed and of the lint on the lost carryover revealed that the conventional reclaimer had the lowest combined loss of $3.56 per bale when processing Pima cotton and the experimental 2-saw feeder with saw-cylinders operating at full speed had the lowest combined loss of $6.89 per bale when processing Upland cotton. The results suggest that losses of lint and seed may be further reduced by using a combination in series of different types of reclaimers to take advantage of each of their respective best features. Keywords: Cotton ginning, Roller ginning, Seed-cotton reclaimer.

scholarly journals HPQS: A Fast, High-Capacity, Hybrid Priority Queuing System for High-Speed Networking Devices

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 130672-130684
Author(s):  
Imad Benacer ◽  
Francois-Raymond Boyer ◽  
Yvon Savaria
Keyword(s):  
High Speed ◽  
High Capacity ◽  
Queuing System
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