Further Analysis of Vertical Crustal Movement Observations in the Lac St. Jean Area, Quebec

1972 ◽  
Vol 9 (9) ◽  
pp. 1139-1147 ◽  
Author(s):  
Petr Vaníček ◽  
Angus C. Hamilton
Keyword(s):  
Systematic Error ◽  
Confidence Limit ◽  
Statistical Tests ◽  
Crustal Movement ◽  
Quebec City ◽  
Confidence Limits ◽  
Downward Movement ◽  
Vertical Crustal Movement ◽  
Movement Rates ◽  
The North

Further statistical tests have been made on levelling data in the Lac St. Jean area of Québec. These tests confirm that relative to Québec City there is downward movement focussed about Stoneham at the rate of 45.7 cm per century with a 95% confidence limit of ± 14.5 cm per century, and that there is uplift to the north and west with rates and 95% confidence limits of 58.8 ± 12.5 cm per century at St. Félicien and 83.5 ± 22.8 cm per century at Senneterre.A test for correlation between elevation differences and movement rates showed no significant effect; this is interpreted as evidence there was no appreciable systematic error in the levelling. From these analyses the possibility that the results might be explained in terms of errors, either random or systematic, can be rejected without any reservations.

Geodetic observations for the detection of vertical crustal movement

1970 ◽  
Vol 7 (2) ◽  
pp. 602-606 ◽  
Author(s):  
L. A. Gale
Keyword(s):  
Survey Methods ◽  
Geodetic Survey ◽  
Vertical Movement ◽  
Crustal Movement ◽  
Quebec City ◽  
North Shore ◽  
The North ◽  
The Stability ◽  
St Lawrence River

The significant limits within which crustal movement can be determined by geodetic survey methods depend on the quality of the observations, the stability of the markers in the network, and the structure of the network. The paper presents a study of vertical movement in the Lac St. Jean area of Québec. The data used covers the periods 1919–1938 and 1962–1966. With reference to a line of levels from Ste. Anne de la Pérade to La Malbaie along the north shore of the St. Lawrence River, the results show annual uplift as high as 10 mm at Seneterre and subsidence amounting to 4 mm at Stoneham, north of Quebec City. Confidence intervals, at the 95% level, for rates of movement are given as indicators of the quality of the results.

scholarly journals Quality of wood in the stands of poplar clones

2008 ◽  
Vol 54 (No. 1) ◽  
pp. 9-16
Author(s):  
R. Petráš ◽  
J. Mecko ◽  
V. Nociar
Keyword(s):  
Root Mean Square Error ◽  
Systematic Error ◽  
Mean Square Error ◽  
Statistical Tests ◽  
Mean Square ◽  
Poplar Clones ◽  
Mean Diameter ◽  
Empirical Material ◽  
Relative Root

The results obtained in research on the quality of raw timber by means of the structure of assortments for the stands of poplar clones Robusta and I-214 are presented in the paper. Models for an estimation of the structure of basic assortments of poplar stands were constructed separately for each clone in dependence on mean diameter, quality of stems, and damage to stems in the stand. The clone Robusta has higher proportions of higher-quality assortments than the clone I-214. The accuracy of models was determined on empirical material. It was confirmed by statistical tests that the models did not have a systematic error. The relative root mean-square error for main assortments of the clone I-214 is 15–27% and Robusta 13–24%.

scholarly journals Anthelmintic treatment in horses : the extra-label use of products and the danger of under-dosing

2003 ◽  
Vol 74 (2) ◽  
Author(s):  
S. Matthee
Keyword(s):  
South Africa ◽  
Confidence Limit ◽  
Intramuscular Injection ◽  
Arithmetic Mean ◽  
Western Cape ◽  
Confidence Limits ◽  
Western Cape Province ◽  
Anthelmintic Efficacy ◽  
Pyrantel Pamoate ◽  
Faecal Egg Count

Anthelmintic products form the basis of helminth control practices on horse stud farms at present. Regular evaluation of the efficacy of these products is advisable, as it will provide information on the worm egg reappearance period and the resistance status in the worm population. The aim of this study was to evaluate the efficacy of doramectin, pyrantel pamoate, ivermectin and moxidectin on a Thoroughbred stud farm in the Western Cape Province, South Africa. The study also compared the anthelmintic efficacy of two moxidectin formulations administered at their recommended dosages (an injectable, at 0.2 mg / kg, not registered for horses, and an oral gel at 0.4 mg / kg, registered for horses). Two mixed-sex groups of 30 yearlings and 40 weaners were tested in 2001 and 2002, respectively, divided into 3 and 4 groups of equal size. In 2001, moxidectin was one of 3 drugs administered orally and at a dose rate of 0.4 mg / kg. In 2002, pyrantel pamoate and ivermectin were orally administered at 19 and 0.2 mg / kg. Moxidectin and doramectin (the latter not registered for horses) were administered by intramuscular injection at a dose of 0.2 mg / kg, the dosage registered for other host species. The faecal egg count reduction test was used to determine the anthelmintic efficacies in both years. Each animal acted as its own control and the arithmetic mean faecal egg count and lower 95 % confidence limit was calculated for each of the groups. A 100 % reduction in the faecal egg counts and a 100 % lower 95 % confidence limit was recorded for moxidectin (0.4 mg / kg) in 2001. In 2002, a 99 % and 96% reduction was recorded for pyrantel pamoate and ivermectin, respectively. In the same year doramectin and moxidectin (both injectable and given at 0.2 mg / kg) did not have any effect on worm egg counts. Of the 4 drugs tested in 2002, only pyrantel pamoate recorded lower 95 % confidence limits above 90 %.

The Denholm landslide, Saskatchewan, Canada, an update

1987 ◽  
Vol 24 (1) ◽  
pp. 163-168 ◽  
Author(s):  
E. Karl Sauer ◽  
E. A. Christiansen
Keyword(s):  
Shear Strength ◽  
Key Words ◽  
Residual Strength ◽  
Average Rate ◽  
Clay Shale ◽  
Movement Rates ◽  
The North ◽  
Lower Block ◽  
Geological Age ◽  
Retrogressive Landslide

The lower block of the Denholm landslide has moved 370 m over alluvium deposited by the North Saskatchewan spillway and river during the last 11 500 years at an average rate of 32 mm/year. These values must be considered minimal because erosion of the toe of the landslide is required for the formation of retrogressive landslides. The shear strength for the bedrock clay (shale) of the Lea Park Formation was back calculated to be [Formula: see text] assuming zero cohesion. Key words: retrogressive landslide, clay shale, residual strength, movement rates, geological age, inclinometer.

Spatial redistribution of Cs-137 and soil erosion on Orléans Island, Québec

1992 ◽  
Vol 72 (4) ◽  
pp. 543-554 ◽  
Author(s):  
Claude Bernard ◽  
Marc R. Laverdière
Keyword(s):  
Soil Erosion ◽  
Quebec City ◽  
Delivery Ratio ◽  
Sediment Delivery ◽  
Soil Movement ◽  
Movement Rates ◽  
Spatial Redistribution ◽  
Soil Redeposition ◽  
Soil Accumulation ◽  
Soil Losses

Cs-137 redistribution data have been used to estimate the extent and the pattern of long-term soil erosion in the Québec City area. Mean annual net soil movements ranging from a deposition of 10.8 t ha−1 yr−1 to a loss of 31.8 t ha−1 yr−1 were estimated. The slope steepness and the land use significantly influenced the estimated rates of soil movement, while soil texture was less important, probably because of the soils’ sandy texture or the high content of organic carbon, which kept their erodibility low. The net soil losses estimated from Cs-137 data were consistently higher than those predicted by the USLE. Besides net soil losses, it was possible to estimate separately the magnitude of soil detachment and soil deposition. Two–thirds of the stations sampled experienced net soil loss while the remaining third showed evidence of soil accumulation. These data suggest that the small net soil losses measured for low erosive conditions (flat slopes, dairy farming) result from important soil redeposition rates as much as from small soil detachment rates. Cs-137 redistribution data not only produce reliable estimates of soil movement rates, but also allow enhanced estimates of the agronomic and environmental impacts of soil erosion.Key words: Cs-137, erosion, sedimentation, USLE, sediment delivery ratio

Description and first occurrence of Myxidium zealandicum (Protozoa: Myxosporidia) in the North American eel Anguilla rostrata LeSueur

1977 ◽  
Vol 55 (1) ◽  
pp. 52-59 ◽  
Author(s):  
M. P. Komourdjian ◽  
W. C. Hulbert ◽  
J. C. Fenwick ◽  
T. W. Moon
Keyword(s):  
North American ◽  
Kidney Tissue ◽  
Quebec City ◽  
Anguilla Rostrata ◽  
Fast Green ◽  
American Eel ◽  
The North ◽  
First Occurrence ◽  
Scanning Electron ◽  
St Lawrence River

Myxidium zealandicum Hine, 1975 is described from gills and kidney of the North American eel Anguilla rostrata collected from the St. Lawrence River near Quebec City and Cornwall. Cysts of M. zealandicum on gills measured up to 1 by 2 mm and in kidneys up to 15 by 20 mm. In addition to single spherical cysts, several polymorphous forms were also observed on the gills. Polymorphous cysts were not found in the kidney. Different stages of spore development were evident in gill cysts and were differentiated by means of a lead hematoxylin – fast green stain. Number and pattern of spore striations were examined by scanning electron microscopy and were highly variable. The invasion of the parasite into kidney tissue appeared to result in less physiological damage to the host than did gill invasion. The existence of this parasite, previously found in eel species in New Zealand, in a North American eel species is discussed.

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