Showing papers by "Government of Canada published in 1977"
TL;DR: Full duplex transmission of television signals over a single optical fiber is demonstrated using directional couplers that possess high directivity and low insertion loss.
Abstract: Full duplex transmission of television signals over a single optical fiber is demonstrated The transmission link uses directional couplers that possess high directivity and low insertion loss
38 citations
TL;DR: In this article, the authors consider the determinants of different levels of private and social costs associated with different stocks of urban unemployed and make an attempt to quantify the major private costs of migration to determine whether they diverge significantly.
Abstract: In LDCs the level of urban wages tends to induce more people to seek employment in the towns than can be employed at this wage level. The existence of these urban unemployed causes the private costs of migration to diverge from the social costs. The individual rural resident decides to remain or migrate on the basis of perceived private costs of migration. The effect of a decision to migrate on the economy is the social cost of migration. In our study we consider the determinants of different levels of private and social costs associated with different stocks of urban unemployed. In addition, utilising survey data on Nairobi, Kenya, an attempt is made to quantify the major private and social costs of migration to determine whether they diverge significantly. On the basis of these estimates some policy options for limiting urban unemployment caused by urban in‐migration are considered.
12 citations
TL;DR: In this article, a method for deriving the distribution of future accidents at a particular crossing based on several crossing characteristics is presented, where the accident history of a crossing is assumed to be a Poisson process with its parameter a linear function of certain predictor variables.
11 citations
01 Jan 1977
TL;DR: The Communications Technology Satellite (CTS) is a joint program of the Canadian Department of Communications (DOC), the National Aeronautics and Space Administration (NASA), and the European Space Agency (ESA) as discussed by the authors.
Abstract: The Communications Technology Satellite (CTS) will be launched into synchronous orbit with a Thor Delta 2914 vehicle in early 1976. CTS is a joint program of the Canadian Department of Communications (DOC), the National Aeronautics and Space Administration (NASA), and the European Space Agency (ESA). The agreements between DOC and NASA formally identify several communications satellite systems technologies to be developed and flight tested in the course of the program, among which are a 3-axis stabilization system to maintain accurate antenna boresight pointing on a spacecraft with flexible appendages, and an extendible lightweight solar array with an initial power output greater than one kilowatt. The present paper describes the corresponding plan and technical activity which is presently being implemented by the Department of Communications in conjunction with SPAR Aerospace Products Limited, University of Toronto Institute for Aerospace Studies, and Telesat Canada. The 3-axis attitude stabilization system for CTS utilizes the ‘momentum wheel with offset thrusters’ principle for on-orbit stabilization. The accuracy of stabilization is projected to be ±0.1° in roll and pitch, and 1.1° in yaw. The solar array for CTS has a beginning-of-life power of 1.2 kilowatt. It employs two solar panels, each 653 cm long and 130 cm wide. The array folds up concertina fashion for stowage, and in deploying and deployed states has significant structural flexibility. CTS will carry instruments to enable flight test, among which are array accelerometers, an array deflection sensing system, array load cells, and temperature sensors. A number of passive ‘monitoring’ and active ‘special excitation’ events will be performed during the two-year mission, to flight test attitude stabilization and solar array design, and to explore structural flexibility and the flexibility and control interaction. In the paper, the stabilization system and solar array are briefly described. Pre-launch analysis, ground test, and parameter determination are discussed. Basic uncertainties which require flight test validation are discussed, and corresponding flight test objectives are outlined. The flight instrumentation to be carried on CTS is described. A computer-based data processing system to be used to handle, distribute, and analyse the flight data, is described. The passive and active events to be monitored during the CTS mission are outlined and discussed.
2 citations
TL;DR: In this paper, the authors investigate whether the presence of the intermediate good plays a significant role in the growing economy and find that the factor intensities of final goods sectors in both the gross and net sense are equally important in determining the properties of the model.
Abstract: The paper investigates whether the presence of the intermediate good plays a significant role in the growing economy. It also discusses the patterns of international specialization in relation to relative factor endowments. The paper finds that the factor intensities of final goods sectors in both the gross and the net sense are equally important in determining the properties of the model.(This abstract was borrowed from another version of this item.)
2 citations