scholarly journals Parameter monitoring and control in industrial sewing machines - an integrated approach

2008 ◽  
Author(s):  
Helder Carvalho ◽  
Ana Rocha ◽  
Joao L. Monteiro ◽  
Luis F. Silva
Keyword(s):  
Integrated Approach ◽  
Monitoring And Control ◽  
And Control ◽  
Parameter Monitoring

Asset Integrity Management – Natural Gas Slug Catcher Facility

2014 ◽  
Author(s):  
D.. Williams ◽  
A.. Boodoosingh
Keyword(s):  
Natural Gas ◽  
Continuous Monitoring ◽  
Integrated Approach ◽  
Process Control System ◽  
Monitoring And Control ◽  
Operational Strategies ◽  
Maintenance System ◽  
Integrity Management ◽  
And Control ◽  
Management Report

Abstract Reliable operations of the Natural Gas {Slug catcher} Facility are heavily dependent on flawless operations and also the maintenance system implemented. The maintenance system is driven by the Asset Integrity Management System (AIMS), which incorporates corrosion control, equipment maintenance, pipeline operations and vessel inspection. This system is also supported by continuous monitoring and control using a Process Control System for the natural gas facility. This paper presents an integrated approach to operations of the Slug catcher facility based on AIMS and operational strategies, which are implemented to ensure efficient and effective operations. Additionally, recommendations for further improvement are documented based on a recent Asset Integrity Management Report.

scholarly journals Efficient Wireless Monitoring and Control of a Grid-Connected Photovoltaic System

2021 ◽  
Vol 11 (5) ◽  
pp. 2287
Author(s):  
Jonathan Medina-García ◽  
Aránzazu D. Martín ◽  
Juan M. Cano ◽  
Juan A. Gómez-Galán ◽  
Adoración Hermoso
Keyword(s):  
Wireless Communication ◽  
Low Cost ◽  
Integrated Approach ◽  
Maximum Power ◽  
Photovoltaic System ◽  
Sensor Nodes ◽  
Effective Control ◽  
Monitoring And Control ◽  
System Solution ◽  
And Control

The design, monitoring, and control of photovoltaic (PV) systems are complex tasks that are often handled together, and they are made even more difficult by introducing features such as real-time, sensor-based operation, wireless communication, and multiple sensor nodes. This paper proposes an integrated approach to handle these tasks, in order to achieve a system efficient in tracking the maximum power and injecting the energy from the PV modules to the grid in the correct way. Control is performed by means of an adaptive Lyapunov maximum power point tracking (MPPT) algorithm for the DC/DC converters and a proportional integral (PI) control for the inverters, which are applied to the system using low latency wireless technology. The system solution exploits a low-cost wireless multi-sensor architecture installed in each DC/DC converter and in each inverter and equipped with voltage, current, irradiance, and temperature sensors. A host node provides effective control, management, and coordination of two relatively independent wireless sensor systems. Experimental validation shows that the controllers ensure maximum power transfer to the grid, injecting low harmonic distortion current, thus guaranteeing the robustness and stability of the system. The results verified that the MPPT efficiency is over 99%, even under perturbations and using wireless communication. Moreover, the converters’ efficiency remains high, i.e., for the DC/DC converter a mean value of 95.5% and for the inverter 93.3%.

Application of Desorption Mass Spectrometry to Molecular Beam Epitaxy

1994 ◽  
Vol 340 ◽  
Author(s):  
Keith R. Evans
Keyword(s):  
Molecular Beam ◽  
Growth Parameters ◽  
Growth Parameter ◽  
Surface Processes ◽  
Monitoring And Control ◽  
Mbe Growth ◽  
Desorption Mass Spectrometry ◽  
And Control ◽  
Parameter Monitoring

ABSTRACTMolecular beam epitaxy (MBE) is the most powerful crystal growth technique available in terms of the range of structures which can be produced. However, further advances in MBEprocess monitoring and control are required to produce the most demanding structures. Also, process yield, cost, and throughput must be improved for MBE to gain in production worthiness. Because of these issues, there currently is much research activity focusing on the development of advanced in-situ sensors for improved growth parameter monitoring and control. Desorption mass spectrometry (DMS) is an in-situ sensor technique for detecting species leaving the substrate during MBE growth processing. Since in general all surface processes affect desorption rates, and all growth parameters affect surface processes, DMS can be utilized to monitor a variety of MBE growth parameters and phenomena. Theimplementation of simple feedback techniques which link DMS error signals to changes in one or more growth parameters then provides for continuous control of desorption rates. This paper reviews some of the most recent accomplishments in the application of DMS forimproved growth parameter monitoring and control. Additionally, anticipated future directions in the application of DMS to epitaxial growth are discussed.

Effluent reuse options in Athens metropolitan area: A case study

1996 ◽  
Vol 33 (10-11) ◽  
pp. 127-138 ◽  
Author(s):  
Yiannis Tselentis ◽  
Stella Alexopoulou
Keyword(s):  
Metropolitan Area ◽  
Integrated Approach ◽  
Primary Treatment ◽  
Monitoring And Control ◽  
Effluent Reuse ◽  
Local Municipalities ◽  
The Government ◽  
Increasing Demand ◽  
Reuse Options ◽  
And Control

In the Athens Metropolitan area nearly 700,000 m3 of effluent is produced per day which after its primary treatment is being discharged into the sea. A serious concern has been expressed by local municipalities and the government on wasting a valuable potential resource. An integrated approach has been selected, which takes into account the water resources management aspects, the growing population and the increasing demand for improving the environmental standards in the greater Athens area. The methodology developed includes: the geographical distribution of prospective users, the quantities required and the availability and cost of the existing sources, the quality standards required and the treatment needed per use, the associated public health and environmental hazards, the institutional and political aspects, the monitoring and control requirements, the social awareness and the need for education and public acceptance for effluent reuse. The various uses examined include: crop irrigation, irrigation of afforestated areas, industrial water supply and domestic non potable use. Twelve different reuse schemes were evaluated. The conclusions are of great interest, since the quantities of the available effluent are enormous and allow the development of an overall reuse strategy for a typical Mediterranean metropolitan area like Athens.

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