Pygmy Implements from Cornwall

1913 ◽  
Vol 1 (3) ◽  
pp. 334-336
Author(s):  
Edwin L. Arnold
Keyword(s):  
Water Supply ◽  
Fresh Water ◽  
Rain Water ◽  
North Coast ◽  
The North ◽  
Snow White ◽  
Fresh Water Supply ◽  
Made In

The pygmy and small implements shown to-night from Cornwall were found on the landward slope of Trevose Head, near Padstow, on the north coast of the county. The sea end of this promontory rises to some 200 feet, and thence the ground inclines rapidly back to the mainland, the connecting neck being not more than half a mile wide. At the narrowest part the rain-water, constantly filtering through the adjacent peat, wastes down the hard bedrock of slate, comes out as a small spring, which, in the course of ages, has cut a channel of a hundred yards in length to the cliff edge. At the springhead stands a cairn of a massive block of white quartz, obviously of great age, but whether coeval with the prehistoric settlpment it would be impossible to say. This cairn or beacon would be seen from a long way over the adjacent bay, and might have served to guide seafarers of any age to the fresh-water supply. Here, amongst the faint traces of trenching and hut circles, the small implements, and chips made in their manufacture, all of snow-white patina, were lying about in great profusion.

scholarly journals Experimental researches on the emission of oxygen by the pelvic filaments of the male lepidosiren with some experiments on symbranchus marmoratus

1932 ◽  
Vol 110 (766) ◽  
pp. 234-248 ◽  
Keyword(s):  
Dissolved Oxygen ◽  
North Coast ◽  
The Political ◽  
Medical College ◽  
The North ◽  
Gran Chaco ◽  
Glass Tubes ◽  
Political Conditions ◽  
Experimental Researches ◽  
Made In

The stage which the question of the function of the pelvic filaments of the male Lepidosiren had reached before the researches described in this paper can be seen by reference to the paper by Carter and Beadle (1930) and that by Cunningham in the previous year. The researches of Carter and Beadle as well as those previously carried out by Graham Kerr were made in the Gran Chaco of Paraguay, in the swamps of which region Lepidosiren is rather abundant. But when direct experiments on the function of the filaments were contemplated the political conditions made it inadvisable to attempt to visit this region, and it was suggested that Lepidosiren would be found in sufficient abundance on the island of Marajó at the mouth of the River Amazon. No evidence was obtained that the fish had recently been taken in that island, but three specimens, all from the same locality, namely a “papyrus meadow” near Fazenda Dunas on the north coast of the island, were recorded in 1896 and 1898 by Dr. Goeldi, Director and founder of the Muséu Goeldi at Belem. It was therefore decided to organise and carry out an expedition to Marajó. The equipment was prepared in the Physiological Department of the London Hospital Medical College and consisted of large glass tubes from 18 inches to 30 inches in length and 1½ inches to 3 inches in diameter; and weighed quantities in hermetically sealed tubes or bottles of the reagents required for the estimation of dissolved oxygen in water, together with the necessary accessories, and a special pump for obtaining water from below the surface of swamp pools.

scholarly journals Evidence for Freshwater Residualism in Coho Salmon, Oncorhynchus kisutch, From a Watershed on the North Coast of British Columbia

2017 ◽  
Vol 130 (4) ◽  
pp. 336 ◽  
Author(s):  
Eric A Parkinson ◽  
Chris J Perrin ◽  
Daniel Ramos-Espinoza ◽  
Eric B Taylor
Keyword(s):  
British Columbia ◽  
Fresh Water ◽  
Coho Salmon ◽  
Pacific Salmon ◽  
Oncorhynchus Kisutch ◽  
Water Levels ◽  
North Coast ◽  
The North ◽  
Seaward Migration ◽  
Mature Fish

The Coho Salmon, Oncorhynchus kisutch, is one of seven species of Pacific salmon and trout native to northeastern Pacific Ocean watersheds. The species is typically anadromous; adults reproduce in fresh water where juveniles reside for 1–2 years before seaward migration after which the majority of growth occurs in the ocean before maturation at 2–4 years old when adults return to fresh water to spawn. Here, we report maturation of Coho Salmon in two freshwater lakes on the north coast of British Columbia apparently without their being to sea. A total of 15 mature fish (11 males and four females) were collected in two lakes across two years. The mature fish were all at least 29 cm in total length and ranged in age from three to five years old. The occurrence of Coho Salmon that have matured in fresh water without first going to sea is exceedingly rare in their natural range, especially for females. Such mature Coho Salmon may represent residual and distinct breeding populations from those in adjacent streams. Alternatively, they may result from the ephemeral restriction in the opportunity to migrate seaward owing to low water levels in the spring when Coho Salmon typically migrate to sea after 1–2 years in fresh water. Regardless of their origin, the ability to mature in fresh water without seaward migration may represent important adaptive life history plasticity in response to variable environments.

A Novel OTEC-DCMD Integrated System for Sustainable Power And Fresh Water Supply

2021 ◽  
Author(s):  
Qingfen Ma ◽  
Yun Zheng ◽  
Hui Lu ◽  
Jingru Li ◽  
Shenghui Wang ◽  
...  
Keyword(s):  
Water Supply ◽  
Fresh Water ◽  
Integrated System ◽  
Sustainable Power ◽  
Fresh Water Supply

Thermoeconomic Analysis of a Solar MVC Desalination System

2018 ◽  
Author(s):  
Lei Gao ◽  
Yunho Hwang ◽  
Gyeong Sung Kim
Keyword(s):  
Water Supply ◽  
Fresh Water ◽  
Great Influence ◽  
Operating Conditions ◽  
Specific Power ◽  
World Population ◽  
Vapor Compression ◽  
Solar Pv ◽  
Pump System ◽  
Fresh Water Supply

Globally, about 10% of the world population does not have access to enough fresh water. In many hot-and-dry coastal regions and islands, the desalination of seawater might be the only practical option to have a fresh water supply. Therefore, low-cost desalination system is critical for freshwater demands. To address this issue, a desalination system consisting of solar photovoltaic (PV) and mechanical vapor compression subsystem is proposed in this study. The entire desalination system was modeled and designed to produce 10,000 m3 of fresh water per day at the coast of San Francisco, California. Key components such as water vapor compressor, solar PV panel, and three-stream heat recovery unit were designed, and their performances were analyzed. The effects of design variables and operating conditions on the system performance were investigated through a parametric study. Finally, an economic analysis was conducted and compared with current desalination technologies. The analysis results show that the specific power consumption of desalination system can reach 14.4 kWh/m3 when the evaporation temperature is 70°C. It is found that the evaporating temperature has a great influence on the heat pump system efficiency and evaporator design. The levelized cost of the proposed system is $0.76 per m3 of fresh water which is lower than current grid-powered vapor compression desalination system and other thermal desalination systems. The proposed solar PV driven desalination improves thermoeconomics of desalination system by applying low-lift operating condition to the vapor compression cycle so that it can contribute to solving the fresh water supply challenges.

scholarly journals Aspects of the Glaciology of Meighen Island, Northwest Territories, Canada

1965 ◽  
Vol 5 (40) ◽  
pp. 399-410 ◽  
Author(s):  
K. C. Arnold
Keyword(s):  
Snow Accumulation ◽  
The Arctic ◽  
North Coast ◽  
Ice Cap ◽  
The North ◽  
Four Seasons ◽  
Northern Half ◽  
Northern Edge ◽  
Summer Temperatures ◽  
Made In

Abstract Meighen Island lies in the centre of the north coast of the Queen Elizabeth Islands and fronts on the Arctic Ocean. An ice cap of about 76 km.2 covers about one-tenth of the island. Its greatest thickness of 150 m. occurs under the summit, near the south end, which was 268 m. above sea-level in 1960. The northern half of the ice cap is less than 30 m. thick; and the total volume is of the order of 2,000 × 106 m.3. Precipitation is low in the northern Queen Elizabeth Islands, and Meighen Island lies in an area where summer temperatures are lowest. In the winters of 1959–60, 1960–61 and 1961–62, the snow accumulation was 12.6, 18.2 and 14.1 cm. of water equivalent. Some snowfall remained on the higher part of the ice cap in the cold summer of 1961; but the ice cap diminished in volume in each year; by 36 × 106, 72 × 106, 22 × 106 and 91 × 106 m.3 in the 1959, 1960, 1961 and 1962 ablation seasons. If the conditions of these four seasons were maintained the ice cap would disappear in about 100 yr. However, a radio-carbon dating of a saxifrage exposed by the retreat of the ice from a small nunatak near the northern edge gave a date of less than 100 yr., and it appears that the existence of the ice cap might be sensitively related to recent climatic change. Careful surveys were made in 1959, 1960 and 1961 in an attempt to detect movement in the ice cap. Unequivocal evidence is not available from these surveys; but the stake network has been maintained and another survey has recently been completed.

scholarly journals Climate Proof Fresh Water Supply in Coastal Areas and Deltas in Europe

2016 ◽  
Vol 31 (2) ◽  
pp. 583-586 ◽  
Author(s):  
Ad Jeuken ◽  
Mette Termansen ◽  
Marco Antonellini ◽  
Theo Olsthoorn ◽  
Eelco van Beek
Keyword(s):  
Water Supply ◽  
Fresh Water ◽  
Coastal Areas ◽  
Fresh Water Supply
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