EASL ... a digital computer language for "hands-on" simulation

SIMULATION ◽  
1966 ◽  
Vol 6 (2) ◽  
pp. 110-120
Author(s):  
S.I. Schlesinger ◽  
L. Sashkin
Keyword(s):  
Visual Inspection ◽  
Computer Applications ◽  
Computer Language ◽  
Simulation Studies ◽  
Computer User ◽  
Algebraic Representation ◽  
Hands On ◽  
Rapid Control ◽  
Simple Language ◽  
And Control

EASL was developed to provide a simple language which would be easy to use by the occasional computer user, whether his background was analog or digital computing, and yet be powerful enough for use in programming com plicated computer applications. The language borrows liberally from the concepts of both analog and digital com puting in order to provide a framework in which a pro grammer from either field would feel at home. At the same time, the user has available the advantages of both disciplines so that he can operate as if he has a very sophis ticated hybrid system in which analog and digital com ponents can be readily intermixed. In order to facilitate the use of EASL for engineering simulation studies, the capability of loading data and pro ducing graphical and tabular reports is provided in a man ner which is easily implemented by the user. Convenient algebraic representation is provided by FORTRAN state ments, and a simply-applied integration operation permits solution of systems of differential equations. The inherent simplicity of data input and output, where all references are made by the variable's name (which is provided by the user), lends itself to the adaptation of consoles to en able the user to monitor and control his computation. These consoles provide a "hands-on" capability for rapid control of computation based upon visual inspection of graphical output.

scholarly journals Mating Disruption of Pseudococcus calceolariae (Maskell) (Hemiptera, Pseudococcidae) in Fruit Crops

Insects ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 343
Author(s):  
Carolina Ballesteros ◽  
Alda Romero ◽  
María Colomba Castro ◽  
Sofía Miranda ◽  
Jan Bergmann ◽  
...  
Keyword(s):  
Visual Inspection ◽  
Mating Disruption ◽  
Economic Importance ◽  
Fruit Crops ◽  
Potential Control ◽  
The Third ◽  
Pseudococcus Calceolariae ◽  
And Control ◽  
Potential Use ◽  
Control Tool

Pseudococcus calceolariae, the citrophilous mealybug, is a species of economic importance. Mating disruption (MD) is a potential control tool. During 2017–2020, trials were conducted to evaluate the potential of P. calceolariae MD in an apple and a tangerine orchard. Two pheromone doses, 6.32 g/ha (2017–2018) and 9.45 g/ha (2019–2020), were tested. The intermediate season (2018–2019) was evaluated without pheromone renewal to study the persistence of the pheromone effect. Male captures in pheromone traps, mealybug population/plant, percentage of infested fruit at harvest and mating disruption index (MDI) were recorded regularly. In both orchards, in the first season, male captures were significantly lower in MD plots compared to control plots, with an MDI > 94% in the first month after pheromone deployment. During the second season, significantly lower male captures in MD plots were still observed, with an average MDI of 80%. At the third season, male captures were again significant lower in MD than control plots shortly after pheromone applications. In both orchards, population by visual inspection and infested fruits were very low, without differences between MD and control plots. These results show the potential use of mating disruption for the control of P. calceolariae.

scholarly journals Optimization of the Bi-Axial Tracking System for a Photovoltaic Platform

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 535
Author(s):  
Cătălin Alexandru
Keyword(s):  
Computer Aided Design ◽  
Tracking System ◽  
Control Device ◽  
Computer Applications ◽  
Optimization Study ◽  
Solar Tracker ◽  
Diurnal Movement ◽  
Multi Body ◽  
Aided Design ◽  
And Control

The article deals with the optimization of the azimuthal tracking mechanism for a photovoltaic (PV) platform, which uses linear actuators as actuation elements for both movements (diurnal and elevation). In the case of diurnal movement, where the platform’s angular field of orientation is large, a mechanism with a relatively simple structure is used for amplifying the actuator’s stroke and avoiding the risk of the system locking itself (by limiting the values of the transmission angle). The optimization study targets the mechanical device, the control device, and the bi-axial tracking program (embodied by the laws of motion in time for the platform’s diurnal and elevation angles) with the purpose of obtaining a high input of solar radiation, with a minimal energy consumption to achieve tracking. The study is carried out by using a virtual prototyping platform, which includes Computer Aided Design (CAD), Multi-Body Systems (MBS), and Design for Control (DFC) computer applications. The mechanical and control devices of the solar tracker are integrated and tested in mechatronic concept. The simulations’ results, which were performed for a set of representative days throughout the year, prove the effectiveness of the proposed design.

The Merging of Computers and Business Communication

1987 ◽  
Vol 15 (4) ◽  
pp. 383-389 ◽  
Author(s):  
Joan C. Roderick ◽  
Karen A. Forcht
Keyword(s):  
College Students ◽  
Organizational Communication ◽  
Teaching Strategies ◽  
Educational Experience ◽  
Business Communication ◽  
Computer Applications ◽  
Hard Copy ◽  
Hands On ◽  
User Friendly ◽  
The Way

Because of the availability of user-friendly software and the affordability of hardware, computers have become a common means of organizational communication. Users have had to change the way they process thoughts and ideas and to transfer them into hard-copy documentation. The integration of the computer into the business communication curriculum allows the instructor to provide a relevant and practical educational experience for college students. This article examines the importance of incorporating hands-on usage of a microcomputer in the business communication class and discusses computer applications and teaching strategies for text editing, punctuation review, and grammar assistance.

scholarly journals Semi-Active Magnetic Levitation System for Education

2021 ◽  
Vol 11 (12) ◽  
pp. 5330
Author(s):  
Gisela Pujol-Vázquez ◽  
Alessandro N. Vargas ◽  
Saleh Mobayen ◽  
Leonardo Acho
Keyword(s):  
Pid Control ◽  
Magnetic Levitation ◽  
Low Cost ◽  
Control Scheme ◽  
Hands On ◽  
Levitation System ◽  
Magnetic Levitation System ◽  
And Control ◽  
Active Control Strategy ◽  
Cost Components

This paper describes how to construct a low-cost magnetic levitation system (MagLev). The MagLev has been intensively used in engineering education, allowing instructors and students to learn through hands-on experiences of essential concepts, such as electronics, electromagnetism, and control systems. Built from scratch, the MagLev depends only on simple, low-cost components readily available on the market. In addition to showing how to construct the MagLev, this paper presents a semi-active control strategy that seems novel when applied to the MagLev. Experiments performed in the laboratory provide comparisons of the proposed control scheme with the classical PID control. The corresponding real-time experiments illustrate both the effectiveness of the approach and the potential of the MagLev for education.

Flight Simulation for Research

1964 ◽  
Vol 68 (646) ◽  
pp. 645-652 ◽  
Author(s):  
D. H. Perry ◽  
J. M. Naish
Keyword(s):  
Flight Simulation ◽  
Simulation Studies ◽  
Aircraft Control ◽  
Motion Cues ◽  
Stability And Control ◽  
Research Problems ◽  
And Control ◽  
The Relationship ◽  
Aircraft Stability And Control ◽  
Vtol Aircraft

SummarySome of the uses of ground based flight simulation as a research tool to aid the design of new aircraft and their equipment are described. The function of the simulator is to provide a method for investigating humon flying tasks in the laboratory, so that the relationship between the pilot's capabilities and the equipment's characteristics can be systematically studied. The paper is presented in two parts describing recent work on two research simulators at the RAE.Part I deals with the use of simulation for studying aircraft stability and control characteristics. The equipment used at RAE for this work is described, with particular emphasis on methods of presenting to the pilot a simulated view of the outside world, and for reproducing some of the motion cues which he experiences in flight. Experimental evidence of the importance of these simulation cues when making aircraft control assessments is also presented. Several examples of simulation studies into the control of conventional and VTOL aircraft are given, to illustrate the type of research problems in this field which may be tackled and the techniques involved in solving them.

FFG7 Class Frigate and DD963 Class Destroyer Marine Gas Turbine Propulsion Systems Maintenance and Operational Training Facility

1985 ◽  
Vol 22 (01) ◽  
pp. 1-27
Author(s):  
Ralph J. Della Rocca ◽  
John D. Stehn
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Mechanical Equipment ◽  
Propulsion Systems ◽  
Electrical Systems ◽  
Training Facility ◽  
Hands On ◽  
Systems Maintenance ◽  
And Control ◽  
Major Emphasis

The need for a gas turbine training facility became apparent with the introduction into the U.S. Navy fleet of the first ships of the FFG7 Frigate and DD963 Destroyer Classes with gas turbine propulsion plants. This facility, constructed at the Great Lakes Naval Training Center, provides "hands-on" training for maintenance and operation of marine gas turbines and associated propulsion plant components and controls and their piping and electrical systems. The Navy intends to train at this facility approximately 1000 personnel per year in the use of their latest and newest propulsion plants. The design of the facility reproduces as closely as possible the existing machinery and control spaces of the two different classes of ships and integrates them into a single main building with the school and the mechanical equipment wings. This paper presents an overview of the need for well-trained, qualified naval personnel to man the expanding fleet of marine gas turbine propulsion systems, existing training facilities and the various stages in the development of the FFG7/DD963 Gas Turbine Maintenance and Operational Training Facility. In regard to the facility, the paper discusses the planning and managing of the project; development of the designs for the building and propulsion plants; construction of the building facilities and FFG7 plant; the fabrication, transportation and erection of the FFG7 within the building; and the testing and operation of the FFG7 plant since light-off. Major emphasis is given to the FFG7 plant since the DD963 plant is being reconsidered in conjunction with the CG47 upgrading and is awaiting a decision to proceed.

scholarly journals Y-site Incompatibility between Premix Concentrations of Vancomycin and Piperacillin-Tazobactam: Do Current Compatibility Testing Methodologies Tell the Whole Story?

2017 ◽  
Vol 52 (2) ◽  
pp. 132-137 ◽  
Author(s):  
Wesley D. Kufel ◽  
Christopher D. Miller ◽  
Paul R. Johnson ◽  
Kaleigh Reid ◽  
James J. Zahra ◽  
...  
Keyword(s):  
Clinical Setting ◽  
Visual Inspection ◽  
Compatibility Studies ◽  
Site Testing ◽  
Visual Evidence ◽  
Site Evaluation ◽  
Smart Pumps ◽  
Intravenous Tubing ◽  
And Control ◽  
Antibiotic Infusion

Background Published literature has demonstrated commercially available premix vancomycin (5 mg/mL) and piperacillin-tazobactam (67.5 mg/mL) as physically compatible via simulated Y-site methodology. Compatibility via actual Y-site infusion has yet to be established. Objective To assess and compare the compatibility of commercially available premix concentrations of vancomycin and piperacillin-tazobactam via simulated and actual Y-site evaluation. Methods Vancomycin and piperacillin-tazobactam were tested using simulated and actual Y-site infusion methodologies. Simulated Y-site compatibility was performed using previously published methods via visual inspection, turbidity evaluation, and pH evaluation. Evaluation occurred immediately, 60 minutes, 120 minutes, and 240 minutes following mixing for each mixture and control. Mixtures were considered physically incompatible if there was visual evidence of precipitation or haze, an absorbance value was greater than 0.01 A, or an absolute change of 1.0 pH unit occurred. Actual Y-site infusion was simulated to mirror antibiotic infusion in the clinical setting by nursing personnel using smart pumps and intravenous tubing. Results No evidence of physical incompatibility was observed during simulated Y-site testing via visual inspection, turbidity assessment, and pH evaluation. Conversely, physical incompatibility was observed to the unaided eye within 2 minutes during actual Y-site infusion. Conclusions Despite observed compatibility between vancomycin and piperacillin-tazobactam via simulated Y-site testing, visual evidence of physical incompatibility was observed during actual Y-site infusion. This poses a potential compromise to patient safety if these antibiotics are administered simultaneously in the clinical setting. Actual Y-site testing should be performed prior to clinical adoption of compatibility studies that are based solely on simulated methodologies.

Self-Powered Wireless Corrosion Detection System

Aerospace ◽  
2006 ◽  
Author(s):  
Gerardo Pen˜a ◽  
Kenneth Hunziker ◽  
Christopher Davis ◽  
Matthew Malkin
Keyword(s):  
Visual Inspection ◽  
Detection System ◽  
Detection Methods ◽  
Sensing Element ◽  
Wireless Transceivers ◽  
Corrosion Detection ◽  
Control Programs ◽  
Require Power ◽  
Self Powered ◽  
And Control

Corrosion affects the maintenance of metal aircraft. Because the onset of corrosion is unpredictable, sensing corrosion is a challenge and scheduled inspections are mandated by corrosion prevention and control programs. Visual inspection is the most common method of corrosion detection. Visual inspections of aircraft structures that are difficult to access are costly and invasive. Beyond visual inspection, several non-destructive corrosion detection methods exist, such as ultrasonic scanners and pulsed eddy current systems. The functionality of these systems, however, does not minimize the invasiveness of inspections. Access to the structure under inspection is required to use these systems or to perform visual inspections. This paper describes a self-powered, wireless corrosion detection system which could enable modification of existing inspection schemes in difficult-to-access areas where corrosion is expected to develop, for example, on structure beneath an aircraft galley or lavatory. The system consists of an energy harvester, an energy storage and conditioning circuit, a corrosion sensing element, and a wireless transceiver network. Advances in energy harvesting and low-power wireless transceivers have enabled the design. The system allows users to download corrosion data from a sensor through a wireless connection, without the need for costly structural disassembly. Because the device is self-powered and wireless, it operates indefinitely without battery replacement, and does not require power or data wiring from the aircraft.

Development of Display Design and Command Usage Guidelines for Spacelab Experiment Computer Applications

1979 ◽  
Vol 23 (1) ◽  
pp. 70-74
Author(s):  
Daniel W. Dodson ◽  
Nicholas L. Shields
Keyword(s):  
Operating System ◽  
System Design ◽  
Response Times ◽  
Error Rates ◽  
Computer Applications ◽  
Monitoring And Control ◽  
Dynamic Update ◽  
Flight Operations ◽  
Computer Operating System ◽  
And Control

Individual Spacelab experimenters are responsible for developing their CRT display formats and interactive command scenarios for payload crew monitoring and control of experiment operations via the Spacelab Data Display System (DDS). In order to enhance crew training and flight operations, it was important to establish some standardization of the crew/experiment interface among different experiments by providing standard methods and techniques for data presentation and experiment commanding via the DDS. In order to establish optimum usage guidelines for the Spacelab DDS, the capabilities and limitations of the hardware and Experiment Computer Operating System design had to be considered. Since the operating system software and hardware ware design had already been established, the Display and Command Usage Guidelines were constrained to the capabilities of the existing system design. Empirical evaluations were conducted on a DDS simulator to determine optimum operator/system interface utilization of the system capabilities. Display parameters such as information location, display density, data organization, status presentation and dynamic update effects were evaluated in terms of response times and error rates.

scholarly journals Accelerated recombination of lophyl radicals and control of the surface tension with amphiphilic lophine dimers

2019 ◽  
Vol 55 (66) ◽  
pp. 9769-9772
Author(s):  
Masaaki Akamatsu ◽  
Kazuki Kobayashi ◽  
Kenichi Sakai ◽  
Hideki Sakai
Keyword(s):  
Aqueous Solution ◽  
Surface Tension ◽  
Interfacial Properties ◽  
Rapid Control ◽  
And Control

The accelerated photoisomerization of amphiphilic lophine dimers enabled rapid control of the interfacial properties of aqueous solution with photoirradiation.

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