scholarly journals U.S. National Defence Research Committee

Nature ◽  
1940 ◽  
Vol 146 (3693) ◽  
pp. 191-191
Keyword(s):  
Research Committee ◽  
National Defence Research ◽  
Defence Research ◽  
National Defence

New Canadian Black Flies (Diptera: Simuliidae).I

1952 ◽  
Vol 84 (2) ◽  
pp. 33-42 ◽  
Author(s):  
G. E. Shewell
Keyword(s):  
New Species ◽  
Field Studies ◽  
Black Flies ◽  
Medical Entomology ◽  
Valuable Data ◽  
National Defence Research ◽  
Defence Research ◽  
Insect Survey ◽  
Work Done ◽  
National Defence

The following descriptions of new species of black flies are based on material acquired from several sources in the Division of Entomology. The largest collections were made by field parties engaged in the Northern Insect Survey, a project commenced in 1947 and conducted by the Division in co-operation with the National Defence Research Board. Much of the simuliid material accumulated by this survey still remains to he examined and it will be several years before the valuable data on species distribution that it contains can be assembled into a form suitable for publication. Several collections of northern material have also been contributed by officers of the Household and Medical Entomology Unit. The rest of the material is the outcome of rnp own field studies in the Ottawa district, These studies, comnenced in 1949 and still continuing, are on a much smaller scale than the northern work and are designed chiefly to increase my knowledge of the group and to verify or supplement certain aspects of the work done by Twinn (1) in this area.

Holarctic Elements Among the Ichneumoninae of Canada

1956 ◽  
Vol 88 (11) ◽  
pp. 647-652 ◽  
Author(s):  
Gerd H. Heinrich
Keyword(s):  
Department Of Agriculture ◽  
Canada Department ◽  
Defence Research ◽  
Insect Survey ◽  
Department Of National Defence ◽  
National Defence

The fallowing records represent a supplement to my former publication “Holarctic Elements among the Ichneumoninae of Maine” (Jour. Wash. Acad. Science 43. May, 1953, p. 148-50). They are based mainly on material obtained by the Northern Insect Survey, which is a co-operative project of the Canada Department of Agriculture and the Defence Research Board, Canada Department of National Defence.

The formation of a blast wave by a very intense explosion I. Theoretical discussion

1950 ◽  
Vol 201 (1065) ◽  
pp. 159-174 ◽  
Keyword(s):  
Atomic Bomb ◽  
Nuclear Fission ◽  
Confined Space ◽  
Research Committee ◽  
Specific Heats ◽  
Mechanical Effects ◽  
Defence Research ◽  
Civil Defence ◽  
Recent Experimental Work ◽  
Spherical Shock

This paper was written early in 1941 and circulated to the Civil Defence Research Committee of the Ministry of Home Security in June of that year. The present writer had been told that it might be possible to produce a bomb in which a very large amount of energy would be released by nuclear fission—the name atomic bomb had not then been used—and the work here described represents his first attempt to form an idea of what mechanical effects might be expected if such an explosion could occur. In the then common explosive bomb mechanical effects were produced by the sudden generation of a large amount of gas at a high temperature in a confined space. The practical question which required an answer was: Would similar effects be produced if energy could be released in a highly concentrated form unaccompanied by the generation of gas? This paper has now been declassified, and though it has been superseded by more complete calculations, it seems appropriate to publish it as it was first written, without alteration, except for the omission of a few lines, the addition of this summary, and a comparison with some more recent experimental work, so that the writings of later workers in this field may be appreciated. An ideal problem is here discussed. A finite amount of energy is suddenly released in an infinitely concentrated form. The motion and pressure of the surrounding air is calculated. It is found that a spherical shock wave is propagated outwards whose radius R is related to the time t since the explosion started by the equation R = S (γ)t t E t ρ 0 -t , where ρ o is the atmospheric density, E is the energy released and S (γ) a calculated function of of γ, the ratio of the specific heats of air.

scholarly journals Closing the loop on Canada's National Food Policy: A food waste agenda

2018 ◽  
Vol 5 (3) ◽  
pp. 273-278
Author(s):  
Tammara Soma
Keyword(s):  
Food Waste ◽  
Food Policy ◽  
The World ◽  
Closing The Loop ◽  
Education And Awareness ◽  
Defence Research ◽  
Near Future ◽  
Waste Food ◽  
National Defence ◽  
Implementation Stage

In the near future, Canada will be implementing a national food policy; in doing so, it will be joining a growing number of countries with policies and strategies that address the growing problem of food waste. Food waste is a major economic drain estimated to cost Canada $31 billion dollars annually or $107 billion in true cost, when the costs of wasted water, energy, and resources are included (Gooch & Felfel, 2014). Despite the staggering cost, there is currently a limited number of scholars tackling the issue of food waste in Canada (Abdulla, Martin, Gooch, & Jovel, 2013; MacRae et al., 2016; Parizeau, von Massow, & Martin, 2015). Some of the leading think tanks and research institutions, such as the World Resources Institute (WRI), National Defence Research Council (NRDC), as well as inter-sectoral collaboratives such as Canada’s National Zero Waste Council (NZWC) have identified several priorities to address food waste. Key priorities include, but are not limited to: 1) education and awareness; 2) harmonizing food waste quantification through waste audits and establishing reduction targets; 3) addressing confusion over “best before” labels; 4) incentivizing surplus food donation; and 5) landfill bans on food waste. While these priorities are currently being debated and consulted upon in Canada, several countries around the world have already reached the implementation stage. Canada is therefore in a position to learn from the impacts of policies in other countries with a view to developing a more sustainable, systematic, and just approach to food waste prevention and reduction in Canada.  

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