WorldCat Identities

DEFENCE RESEARCH ESTABLISHMENT OTTAWA (Ont.)

Overview
Works: 675 works in 698 publications in 1 language and 730 library holdings
Classifications: U395.C3, 629.136
Publication Timeline
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Most widely held works by DEFENCE RESEARCH ESTABLISHMENT OTTAWA (Ont.)
Nickel/Cadmium Aircraft Batteries: Rapid Electrolyte Exchange Technique by K Feldman( Book )

2 editions published in 1977 in English and held by 5 WorldCat member libraries worldwide

The potassium hydroxide electrolyte in nickel/cadmium aircraft batteries may become increasingly more contaminated by carbonate with battery use. When the carbonate concentration exceeds certain limits it is advisable to exchange the electrolyte. However, most of the electrolyte in a cell is soaked into the separator materials and plate pores, and is held in the pack, so only a small portion of it may be poured out. Repeated removal and replacement of these small amounts can accomplish the desired exchange if the clean added electrolyte is adequately mixed with the contaminated electrolyte each time. In the normal procedures, mixing is accomplished by discharging and recharging the battery after each small exchange and hence is very time consuming. This paper discusses the various factors involved and presents a vacuum technique for mixing the added with the retained electrolyte in each cell. The method presented reduces the time required for the above operation from a week or more to a day or two. (Author)
Personal Protection against Biting Flies: The Relative Effectiveness of Overjackets Treated with Various Insect Repellents( Book )

1 edition published in 1976 in English and held by 5 WorldCat member libraries worldwide

Wide-mesh overjackets treated with six different insect-repellent formulations were tested against a local biting-fly population. The overjacket treatments included N, N-diethyl-m-toluamide (deet), two mixtures containing deet and vanillin, two morpholine derivatives and an oxazolidine derivative. The overjackets treated with deet and deet-vanillin mixtures provided the most protection against biting flies. In protecting the facial area, these overjackets were as effective as applying deet liquid directly to the skin. (Author)
A High-Range Solid-State Radiacmeter with Digital Display( Book )

1 edition published in 1977 in English and held by 4 WorldCat member libraries worldwide

A high-range radiacmeter using a solid-state detector and a digital readout has been designed and constructed. The detector is an inexpensive silicon diode of area 0.8 square millimeters developed for use as a photodiode. The instrument is capable of measuring dose rates from 0.1 to 999 rad/h, readout being provided by a three-digit LED display with automatic range switching. (Author)
Nickel/Cadmium Aircraft Batteries: Multichannel Gassing-Rate Meter by K Feldman( Book )

1 edition published in 1977 in English and held by 3 WorldCat member libraries worldwide

The instrument described is used to assess the state of health of separators in nickel/cadmium aircraft batteries and thus to permit removal from service of those cells which may be expected to fail catastrophically in the near future. Twenty channels are provided to permit simultaneous observation of all cells in a complete battery. Each channel measures the rate of emission of gas from one cell during overcharge by means of the pressure build up in a chamber from which the gas escapes via a suitable orifice. Construction, calibration and cleaning are discussed. (Author)
Additional Studies on Clothing Treatments for Personal Protection against Biting Flies( Book )

1 edition published in 1979 in English and held by 3 WorldCat member libraries worldwide

Experiments were continued on field studies of repellent or insecticide treated mesh clothing items conducted at DREO between 1975 and 1977. Several small tests were carried out at Canadian Forces Base Petawawa to evaluate various mesh jackets with hoods, or separate hoods, against adult mosquitoes or blackflies. The items had been treated with diethyltoluamide, a repellent, or permethrin, an insecticide. It is confirmed that: (a) permethrin treated jackets with hoods will provide an acceptable level of protection to the wearer against the species of blackflies and mosquitoes that were present during the field studies and (b) initially, at least, the permethrin treated hoods do not give the level of face protection against biting flies that deep repellent treated hoods will
A Low-Range Extension for the AN/FDR-502 Radiacmeter( Book )

1 edition published in 1974 in English and held by 3 WorldCat member libraries worldwide

A plug-in module and detector are described which extend the range of the AN/FDR-502 Remote Reading Radiation Monitor and Alarm System from 100 mR/h down to background (10 to 15 microR/h). The detector, an 18504 Geiger-Mueller tube, is connected to the control console by a single-core screened cable which can be up to 500 feet in length. (Author)
Nickel/Cadmium Aircraft Batteries: High Rate Discharge Equipment by Defence Research Establishment Ottawa( Book )

1 edition published in 1976 in English and held by 3 WorldCat member libraries worldwide

Factors that are not of major significance in low rate battery discharges become quite important when a battery is used to crank an aircraft turbine engine. Apparatus was designed and built to facilitate the study of nickel/cadmium aircraft batteries when used in this and other high rate applications. Maximum discharge rates of 1000 amperes or more are possible with 24-volt batteries. Load configurations may be readily modified. Discharge profiles are simulated by use of fixed load steps which may be timed either automatically or manually. This document describes the equipment and gives instructions for its use. (Author)
Sverdrup Channel( Book )

1 edition published in 1974 in English and held by 3 WorldCat member libraries worldwide

The report assesses the available physical and environmental information on Sverdrup Channel
A Physiological Comparison of Two Types of Duffel Sock for Use with the Canadian Forces Mukluk( Book )

1 edition published in 1976 in English and held by 2 WorldCat member libraries worldwide

A series of physiological trials was conducted in the DREO cold chamber to compare the durability, comfort and thermal protection offered by the standard Canadian Forces duffel sock and an experimental duffel sock worn with the Arctic mukluk. No significant differences in levels of foot perspiration or foot temperature were observed. However, since the correct sizes were not available, none of the test subjects could be fitted properly with the experimental duffel sock and varying degrees of foot discomfort were experienced. (Author)
Insulated Tents for Cold Weather Operations( Book )

1 edition published in 1987 in English and held by 2 WorldCat member libraries worldwide

Analyses of the insulation requirements and ventilation rates for small, insulated tents were made and compared with both laboratory and field observations on two proto-type tents used during a winter trial. Predicted values of thermal resistance were in good agreement with measured values, although it was found that construction techniques could significantly alter the value of thermal insulation for the tent. Two analyses of the ventilation rate were made, one based on the conservation of thermal energy and the second based on a buoyancy driven pipe flow analysis. Predicted ventilation rates agreed with measured values to within a factor of two under calm conditions. An estimate of the minimum acceptable ventilation rate was made based on a stoichiometric combustion analysis of a generalized hydrocarbon fuel. It was found that, for the insulated tents studied, this minimum ventilation rate could be achieved by natural convection alone. This may not be the case for uninsulated tents as resulting tent air temperatures may be insufficient to produce adequate natural convection ventilation. Observations of carbon monoxide levels, made while heating the tents during the winter trial, indicated that the levels where well within acceptable occupational levels and often within acceptable public exposure levels. The use of insulated tents may indirectly help reduce the hazards of carbon monoxide by providing a more comfortable environment within the tent thereby reducing the incentive to restrict the ventilation of the tent. Water accumulation by the tents was found to be larger than expected, possibly due to the warmer than expected weather during field trial
A Least-Squares Straight-Line Fitting Algorithm with Automatic Error Determination( Book )

2 editions published in 1998 in English and held by 2 WorldCat member libraries worldwide

We demonstrate a new generalized least squares fitting method which can be used to estimate the slope of the best fitting straight line that results when two separate data sets which are expected to be linearly correlated are subject to different uncertainties in their measurements. The algorithm determines not only the optimum slope, but also produces estimates of the intrinsic errors associated with each data set. It requires almost no initial information about the errors in each technique
Evaluation of the marisat satellite uhf wideband channel by W. R Seed( Book )

2 editions published in 1990 in English and held by 2 WorldCat member libraries worldwide

The Department of National Defense (DND) is making increasing use of satellite communications (SATCOM) to relay voice and data between land, sea and air resources. SATCOM is being used by DND for both domestic and NATO exercises. DND is currently considering leasing UHF transponder time on the MARISAT F-1 satellite. In this report the feasibility of using the MARISAT UHF transponder for the transmission of digital voice at rates of 2.4, 4.8 and 16 kbps is investigated. The MARISAT satellite has three independent transponding UHF repeaters. There are two 25 kHz channels and one 500 kHz channel, each of which is a fully redundant repeater. It is the wideband (500 kHz) channel that is of particular interest in this report. The channel is divided into twenty subchannels each having a 25 kHz bandwidth. The data rates typically used within the subchannels vary from 75 to 2400 bps, although higher rates are possible. The link analysis, which is based on deriving the terminal carrier-power-to-noise-power-spectral-density ratio (C/No), shows that only 2 or 3 users at most can be supported at a data rate of 16 kbps, assuming a 3 dB line margin. For the majority of the loading cases considered, at least 10 users could be supported at the 2.4 and 4.8 kbps data rates, again with a 3 dB link margin. The results of a limited 24-hour terminal C/No test using the MARISAT transponder and terminal test equipment demonstrate the terminal C/No fluctuations when the transponder is only lightly loaded. An investigation of the spectrum usage during this test period shows two subchannels to be occupied by unauthorized users/sources
Detection and tracking of low-altitude aircraft using HF surface-wave radar by Hing C Chan( Book )

2 editions published in 1998 in English and held by 2 WorldCat member libraries worldwide

A series of aircraft-detection trials was conducted using experimental high frequency surface wave radar (HFSWR) facilities located on the east coast of Canada. These trials were part of a research and development project undertaken by DND to demonstrate the HFSWR technology in a wide-area coastal surveillance role. Several aircraft were used in these trials, including a Beechcraft King-Air 200, a Lockheed T-33 and a Canadair Challenger 601 aircraft. Experimental results were in excellent agreement with theoretical predictions. With relatively low averaged power, the King-Air and the Challenger were tracked to beyond 120 km. The ability of the HFSWR to track manoeuvring targets was demonstrated. In addition the radar was shown to be capable of long-range tracking of high-altitude aircraft. Signal processing algorithms for the HFSWR can be improved by exploiting the characteristics of the signal environment measured in these trials
Characterization measurements on new nickel/cadmium aircraft batteries manufactured by Marathon and SAFT by K Feldman( Book )

1 edition published in 1979 in English and held by 2 WorldCat member libraries worldwide

A set of measurements has been found useful in the laboratory at DREO for characterizing nickel/cadmium aircraft cells. It is thought such measurements would also be useful in the battery shop to aid in the making of decisions on the need for reconditioning or for discarding cells which are no longer safe or satisfactory. Most of the experience at DREO has, however, dealt with old or rebuilt batteries. Recently one new 22Ah battery from Marathon and two new 36Ah batteries from SAFT were obtained. Results of the measurements on these are therefore of special interest. This paper briefly outlines the measurements and presents the data obtained. (Author)
New DREO mobile nuclear laboratory by Defence Research Establishment Ottawa( )

2 editions published between 1992 and 1993 in English and held by 2 WorldCat member libraries worldwide

The new DREO Mobile Nuclear Laboratory (MNL) has just recently completed successful field trials. The capabilities of the new MNL are examined, and seen to be far superior to its predecessor. This lab will help keep DREO at the forefront of nuclear radiation research within the NATO community for many years to come
Ice Drift in Robeson Channel as Determined Using Television Moving Target Circuitry( Book )

1 edition published in 1974 in English and held by 2 WorldCat member libraries worldwide

The movement of ice floes in Robeson Channel was followed over a one-week period during August 1973 using television moving-target circuitry from a cliffside base 350 m above sea level. The basis of the method was to subtract a current TV picture from a video tape recording of the same scene made some time previously, the difference imagery being displayed on a monitor. The TV camera was aimed to produce coincidence of a reference point selected near the center of the pre-recorded imagery, and the changes in azimuth and elevation recorded. From these, ice drift velocities were calculated
Accelerated Storage Trials of Two Components of the Detector Kit, Chemical Agent, C2( Book )

1 edition published in 1977 in English and held by 2 WorldCat member libraries worldwide

Accelerated storage trials indicate that both the methanol solution of N-ethyl-N-(2-hydroxyethyl)aniline and the 'blue-band' tubes, as packaged for the Detector Kit, Chemical Agent, C2 have shelf lives in excess of five years. (Author)
Measurements of multipath and its effects on terrestrial VHF radio direction finding by Defence Research Establishment Ottawa( Book )

2 editions published in 1997 in English and held by 2 WorldCat member libraries worldwide

This report details the investigation of VHF radio direction finding (DF) and the effects of multipath propagation for terrestrial paths. For this investigation, an eight channel DF system was used to make field measurements of a transmitter as it was slowly moved along a designated route. This allowed the fine scale effects of multipath on the measured signal bearing and power to be observed - effects which had been previously observed as being noise like in nature. Computer modeling was also used in order to develop simulations able to reproduce the effects observed in the field measurements. This has lead to the identification of the main sources of multipath, and a statistical assessment of their numbers and distribution. The computer models also allowed other factors affecting DF accuracy to be investigated which include: the transmitter receiver path length, the size of the clearing at the DF site, the DF antenna height, and the DF algorithm. The main conclusions are that multipath is a major impediment to very high accuracy DF for terrestrial VHF DF systems, but that steps can be taken to mitigate its effects
A system study of requirements for SHF/EHF-terminal phased-array antennas by E. B Felstead( Book )

2 editions published in 1997 in English and held by 2 WorldCat member libraries worldwide

There is much current interest in the use of phased array antennas for military satellite communications terminals. These antennas present definite advantages over conventional dish antennas, such as electronic steering capability, conformal surface potential, and graceful degradation. In view of the potential of phased arrays, CRAD initiated an R & D project, as part of the Military Information and Technology Infrastructure (MITI) thrust, to provide advice on issues such as performance benefits, potential technical improvements, implementation issues, and potential market niche areas. In this report, this process is initiated by generating a set of specifications for the development of such phased array antennas. Five types of terminals are analyzed, namely: EHF manpack, EHF airborne, EHF land transportable, multi-band vehicle mounted, and multi-band shipboard. For the five strawman applications, performance specifications such as EIRP, G/T, etc. are provided
 
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English (26)