Higher order vortex gyrotropic modes in circular ferromagnetic nanodots

Magnetic vortex that consists of an in-plane curling magnetization configuration and a needle-like core region with out-of-plane magnetization is known to be the ground state of geometrically confined submicron soft magnetic elements. Here magnetodynamics of relatively thick (50-100 nm) circular Ni80Fe20 dots were probed by broadband ferromagnetic resonance in the absence of external magnetic field. Spin excitation modes related to the thickness dependent vortex core gyrotropic dynamics were detected experimentally in the gigahertz frequency range. Both analytical theory and micromagnetic simulations revealed that these exchange dominated modes are flexure oscillations of the vortex core string with n = 0,1,2 nodes along the dot thickness. The intensity of the mode with n = 1 depends significantly on both dot thickness and diameter and in some cases is higher than the one of the uniform mode with n = 0. This opens promising perspectives in the area of spin transfer torque oscillators.

1978 Fisheries statistics - Kariba

Fishery statistics for 1978 are presented for: (1) total production; (2) effort and landings; (3) gill-net fisheries production landings and purchases; (4) monthly percentage composition of catch for Kariba area; (5) African camp effort statistics: (6) sardine fisheries.

The proposed Lune net limitation order 1999 and associated byelaws

The River Lune rises in the hills around Tebay in thje North of England and runs through rural farming country to Morecambe bay. It is generally considered as a river of high purity and unspoiled nature. The salmon fishery was at one time considered amongst the best in England and Wales, with very high catches to both rod and net fishermen. During the late 1960's the disease UDN decimated the stock. Since then there has been a recovery of the stock, but this is considered by most anglers and netsmen to be a partial recovery of some of the previous stock components. In recent years anglers and netsmen have voiced their concerns over the Lune stock and have lobbied for action to improve the Lune fishery. This net limitation order (NLO) and the separate byelaw in conjunction with habitat improvement are proposed as part of the strategy for future conservation and management of this salmon fishery. The fishery is currently exploited by 37 licensed netsmen, the highest number of any single estuary in England and Wales. There are 26 haaf, 10 drift and 1 seine nets available. Current estimates of the rod fishery are that 1100 to 1400 anglers fish 14 000 days per year. The River Luhe is one of the few rivers within England and Wales that has the benefit of an accurate fish counter. The counter is at Forge Weir approximately 4 km upstream of the tidal limit. The counts, together with records of the catches from the rod and net fishery, enable a reasonably accurate assessment of both rod and net exploitation. Extensive surveys of the juvenile population, carried out in 1991 and 1997, provide additional information. The purpose of this document is to describe and explain the current state of the salmon population in the River Lune and in doing so, demonstrate the current need for stock conservation. A second purpose is to demonstrate that the proposed NLO and byelaw package should allow the salmon population to reach its conservation target (spawning escapement target).

1994 annual report on fisheries in the North west incorporating the annual summary of fishery statistics.

This report provides national and regional developments, statistics on fisheries finance, including income and expenditure, salmon and sea trout catches, including rod and line, commercial catches, and angler log book returns, monitoring and special projects, including salmon microtagging, salmon egg survival in Swanside Beck, and fish stock assessments, one with hydroacoustics, and one of surveys of different areas in Cumbria. The appendix includes a summary of fish statistics for 1994.

1995 annual report on fisheries in the North west incorporating the annual summary of fishery statistics.

This fisheries report summarises national and regional developments focussing on the North West region of the Environment Agency. The North West region covers around 14,000 square km, from Cheshire in the south to its northern border with Scotland. The report provides statistics on fisheries finance, including income and expenditure, salmon and sea trout catches, including rod and line and net catches, and special projects, including fish stock assessments, and surveys. The appendix includes a summary of fish statistics for 1995.

1998 annual report on fisheries in the North west incorporating the annual summary of fishery statistics.

This fisheries report summarises national and regional developments focussing on the North West region of the Environment Agency. The North West region covers around 14,000 square km, from Cheshire in the south to its northern border with Scotland. This report provides national and regional developments,and special projects, including fish stocking assessments, radiotracking, and Cumbria surveys. Salmon and sea trout catches, including rod and line and net catches appear in the appendix.

1999 annual report on fisheries in the North west incorporating the annual summary of fishery statistics

This fisheries report summarises national and regional developments focussing on the North West region of the Environment Agency. The North West region covers around 14,000 square km, from Cheshire in the south to its northern border with Scotland. The report provides statistics on fisheries finance, including salmon and sea trout catches, including rod and line and net catches, and special projects, including fish stock assessments, radiotracking, and various surveys. The appendix includes a summary of fish statistics for 1999.

Summary of fishery statistics, 1974-77

This fisheries report summarises developments of the years 1974-77 in the region of the North West Water Authority. This report provides catch statistics, rod and line and commercial for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at Authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions.

Summary of fishery statistics, 1978

This fisheries report summarises developments of the year 1978 in the region of the North West Water Authority. This report provides catch statistics, rod and line and commercial for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at Authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions.

Summary of fishery statistics, 1979

This fisheries report summarises developments of the year 1979 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions.

Summary of fishery statistics, 1980

This fisheries report summarises developments of the year 1980 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at Authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions.