Possible Effects of Passamaquoddy Tidal Power Structures on the Canadian Lobster Industry

1960 ◽  
Vol 17 (4) ◽  
pp. 553-563
Author(s):  
D. G. Wilder
Keyword(s):  
Power Structures ◽  
Tidal Power ◽  
Modest Increase ◽  
Distribution Centre ◽  
Passamaquoddy Bay ◽  
Average Size

Lobster stocks outside Passamaquoddy Bay are not expected to be affected by the proposed development. Within the bay, the hatch, survival and settlement of larvae are expected to increase. An increased rate of exploitation, a modest increase in poundage of commercial landings, and a decrease in the average size of the lobsters caught are to be expected. The use of the bay as an important commercial collection, storage and distribution centre for live lobsters will be seriously affected.

Herring Movements in the Bay of Fundy and Gulf of Maine, 1957 and 1958

1961 ◽  
Vol 18 (2) ◽  
pp. 221-252 ◽  
Author(s):  
R. A. McKenzie ◽  
S. N. Tibbo
Keyword(s):  
Gulf Of Maine ◽  
Far East ◽  
Bay Of Fundy ◽  
Power Structures ◽  
Tidal Power ◽  
Straight Line ◽  
Apparent Relationship ◽  
Passamaquoddy Bay ◽  
Straight Line Distance ◽  
Surface Drift

During 1957 and 1958, 137,469 herring were tagged in the southern part of the Bay of Fundy and the western part of the Gulf of Maine. These fish were immature and ranged in mean total length from 9.9 to 20.0 cm and in age from 1 to 3 years. Recovery of 3,582 (2.6%) tagged individuals showed that herring moved in and out of Passamaquoddy Bay irregularly throughout the summer and autumn with some tendency to concentrate at the head of this bay. Outward movement reached a peak in July when there was a considerable movement eastward towards Point Lepreau. Herring moved into Passamaquoddy from as far south as Grand Manan and from as far east as Point Lepreau. Little interchange of herring took place between the Passamaquoddy area and the coasts of Maine and Nova Scotia. The greatest straight-line distance from release to recovery points was 55 miles. More than half of the recaptures were made within 2 miles of the tagging sites and nearly two-thirds within 5 miles. About 28% of the recaptures were made within 1 week after tagging and 63% within 2 weeks. The average time before recapture was 12 days in 1957 and 17 days in 1958. The longest time between release and recapture for both years was 165 days. Drift bottles released with tagged herring showed no apparent relationship between herring movements and surface drift. The results of tagging support a general conclusion that the proposed Passamaquoddy tidal power structures will have no significant effect on the herring fisheries of the Passamaquoddy area.

Herring Fishery in Southern New Brunswick

1960 ◽  
Vol 17 (2) ◽  
pp. 133-168
Author(s):  
R. A. McKenzie ◽  
S. N. Tibbo
Keyword(s):  
New Brunswick ◽  
Tidal Power ◽  
Annual Variations ◽  
Significant Relationships ◽  
Passamaquoddy Bay

Most of the herring taken in the Passamaquoddy area of southern New Brunswick are caught in stationary weirs built close to shore. Analyses of weir catches show no significant relationships between average catches inside Passamaquoddy Bay and catches in outside areas for the same year. Weirs inside Passamaquoddy Bay are more efficient and catch about twice as many herring per weir as those outside the Bay.Seasonal and annual variations both in individual weir catches and in total catches in the various statistical districts of Charlotte County are far greater now than any changes that can be forecast as resulting from the installation of the proposed Passamaquoddy tidal power dams.

scholarly journals POTENTIALS OP TIDAL POWER ON THE NORTH ATLANTIC COAST IN CANADA AND UNITED STATES

1964 ◽  
Vol 1 (9) ◽  
pp. 49 ◽  
Author(s):  
Jan T. Laba
Keyword(s):  
North Atlantic ◽  
Power Plants ◽  
Atlantic Coast ◽  
Tidal Power ◽  
Power Sources ◽  
The North ◽  
Auxiliary Power ◽  
Passamaquoddy Bay ◽  
Limited Length ◽  
The North Atlantic

In this paper the most suitable locations for erection of tidal power plants on the North Atlantic Coast are reviewed and classified in respect to the possible pool arrangement. The harnessing of the tides to produce power in various layouts is described. Due to the limited length of this paper, it was only possible to discuss and compare the power output from two proposed tidal power projects, Passamaquoddy Bay and Shepody Bay, and also to discuss some auxiliary power sources to supplement the varying output of tidal power. The tide producing forces and the effect of the coastline on the tide height is also briefly introduced.

Energy Considerations in the Bay of Fundy System

1958 ◽  
Vol 15 (2) ◽  
pp. 115-134 ◽  
Author(s):  
H. J. McLellan
Keyword(s):  
Mixed State ◽  
Roughness Length ◽  
Tidal Range ◽  
Bay Of Fundy ◽  
The Moon ◽  
Tidal Friction ◽  
Roughness Elements ◽  
Passamaquoddy Bay ◽  
The Mean ◽  
Average Size

Following developments of Taylor, Allard and Redfield, the rates at which energy is dissipated in the Bay of Fundy in various ways are calculated. A total of 30.9 × 106 kw. is transmitted into the bay of which 1.26 × 106 kw. is transmitted into Passamaquoddy Bay. Work is done on the moon at the rate of 2.48 × 106 kw. and 0.03 × 106 kw. is used to maintain the mixed state in the waters of the Bay of Fundy. The remaining 27.1 × 106 kw. must be dissipated by tidal friction. This value is compatible with the usual concepts of turbulent flow over a rough surface if the "roughness length" (Z0) is equal to 0.4 cm. or the average size of the roughness elements (E) is about 11 cm.The effect which the extraction of additional power from the system would have on tidal ranges is evaluated. The range at the head of the Bay of Fundy would decrease at the rate of 0.84 foot (26 cm.) for each million kilowatts. The proposed Passamaquoddy Project would probably increase the mean tidal range at Hopewell Cape by 0.6 foot (18 cm.)

Predicted Effects of Proposed Tidal Power Structures on Groundfish Catches in Charlotte County, N.B.

1960 ◽  
Vol 17 (2) ◽  
pp. 169-173 ◽  
Author(s):  
W. R. Martin
Keyword(s):  
Measurable Effect ◽  
Power Structures ◽  
Tidal Power

It is predicted that the construction of power structures will have no measurable effect on Charlotte County groundfish landings as a whole. It is expected that the 1,700,000 lb or 12% of the Charlotte County groundfish catch, taken in 1958 inside the dam sites, will be greatly reduced. Specifically, it is forecast that the pollock line fishery in Head Harbour Passage, which yielded 1,500,000 lb in 1958, will be greatly reduced, the haddock dragger fishery will be reduced or eliminated in the high pool, and the flounder fishery in Passamaquoddy and Cobscook Bays will probably increase.

Studies of Haddock in the Passamaquoddy Bay Region

1960 ◽  
Vol 17 (2) ◽  
pp. 175-180 ◽  
Author(s):  
F. D. McCracken
Keyword(s):  
New England ◽  
Early Summer ◽  
Small Fish ◽  
Large Fish ◽  
Power Structures ◽  
Passamaquoddy Bay

From 1954 to 1957 haddock within Passamaquoddy Bay have been of intermediate sizes. Few small fish or large fish have been captured either by commercial fishermen or in small-mesh research nets. Tagged fish of the Passamaquoddy Bay region moved out of the Bay during winter and mingled mainly with haddock stocks off the New England States. In the following summer recaptures of tagged fish were again most numerous within Passamaquoddy Bay. Stocks of haddock within the Bay appear to result from annual migrations into the Bay in early summer. It is predicted that the proposed power structures would have no effect on haddock stocks outside the high and low pools but that they would probably seriously reduce the haddock population within the high pool.

Grain Refinement in Titanium-Erbium Alloys

1974 ◽  
Vol 32 ◽  
pp. 522-523
Author(s):  
B. B. Rath ◽  
J. E. O'Neal ◽  
R. J. Lederich
Keyword(s):  
Electron Microscopy ◽  
Size Distribution ◽  
Grain Refinement ◽  
Grain Growth ◽  
Volume Fraction ◽  
Pure Titanium ◽  
Systematic Investigation ◽  
Second Phase ◽  
Titanium Matrix ◽  
Average Size

Addition of small amounts of erbium has a profound effect on recrystallization and grain growth in titanium. Erbium, because of its negligible solubility in titanium, precipitates in the titanium matrix as a finely dispersed second phase. The presence of this phase, depending on its average size, distribution, and volume fraction in titanium, strongly inhibits the migration of grain boundaries during recrystallization and grain growth, and thus produces ultimate grains of sub-micrometer dimensions. A systematic investigation has been conducted to study the isothermal grain growth in electrolytically pure titanium and titanium-erbium alloys (Er concentration ranging from 0-0.3 at.%) over the temperature range of 450 to 850°C by electron microscopy.

Identification by Electron Microdiffraction of Intermetallic Phases in a Duplex Stainless Steel

1990 ◽  
Vol 48 (2) ◽  
pp. 494-495
Author(s):  
A. Redjaïmia ◽  
J.P. Morniroli ◽  
G. Metauer ◽  
M. Gantois
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Convergent Beam Electron Diffraction ◽  
Intermetallic Phases ◽  
Small Particles ◽  
Parallel Beam ◽  
Diffraction Patterns ◽  
Average Size ◽  
Convergent Beam ◽  
Electron Microdiffraction

2D and especially 3D symmetry information required to determine the crystal structure of four intermetallic phases present as small particles (average size in the range 100-500nm) in a Fe.22Cr.5Ni.3Mo.0.03C duplex stainless steel is not present in most Convergent Beam Electron Diffraction (CBED) patterns. Nevertheless it is possible to deduce many crystal features and to identify unambiguously these four phases by means of microdiffraction patterns obtained with a nearly parallel beam focused on a very small area (50-100nm).From examinations of the whole pattern reduced (RS) and full (FS) symmetries the 7 crystal systems and the 11 Laue classes are distinguished without ambiguity (1). By considering the shifts and the periodicity differences between the ZOLZ and FOLZ reflection nets on specific Zone Axis Patterns (ZAP) which depend on the crystal system, the centering type of the cell and the glide planes are simultaneously identified (2). This identification is easily done by comparisons with the corresponding simulated diffraction patterns.

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