High speed, high capacity ATM optical switches for future telecommunication transport networks

1996 ◽  
Vol 14 (5) ◽  
pp. 979-998 ◽  
Author(s):  
F. Masetti ◽  
J. Benoit ◽  
F. Brillouet ◽  
J.M. Gabriagues ◽  
A. Jourdan ◽  
...  
Keyword(s):  
High Speed ◽  
High Capacity ◽  
Optical Switches ◽  
Transport Networks

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.

eu Policy and Law Regarding Railways and the Environment

2016 ◽  
Vol 13 (1) ◽  
pp. 30-45
Author(s):  
Ludwig Krämer
Keyword(s):  
Air Pollution ◽  
High Speed ◽  
Short Description ◽  
Environmental Concerns ◽  
Environmental Aspects ◽  
Transport Networks ◽  
Technical Standards ◽  
Environment Friendly ◽  
Railway Freight ◽  
Planning And Operation

For decades, railway issues were considered, in Europe, as being almost entirely in the responsibility of the Member States. This history is even reflected in the present eu approach on railway issues which has, as one of its political priorities, the objective to ensure the interoperability of national legal and technical standards all over the eu. The development of trans-European transport networks, the upcoming of high-speed transboundary trains and the internationalisation of railway freight transport which are of relative recent date, all contribute to the greater awareness of railway impacts on the environment. Policies can no longer promote railways with the argument that rail is the most environment-friendly means of transport, but are more and more obliged to take into consideration, during the planning and operation of railways, local, provincial and regional environmental concerns. The contribution passes in review the most relevant environmental concerns with regard to railways. After a short description of the regulatory frame, the different environmental aspects of railways – land use, nature conservation, noise, water, air pollution, and waste management – are discussed. Some concluding remarks follow.

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.

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