24,551 research outputs found
Fish and fisheries of Bakolori Reservoir
Details are given of fisheries activities carried out in Bakolori Reservoir within the context of many and varied functions of Sokoto Rima River Basin Development Authority. Experimental fishing was conducted for 55 days in 1979 when the reservoir was only one year old and the exercise continued in 1980 and 1981 also for 85 and 52 days respectively. During the exercise, the catch per unit effort showed an increasing trend with increasing efforts by four times to that of the initial. The fish harvest was 1.205 kg/day when 3.8 nets were operated in 1979, this went up to 3.2 kg when the number of nets were increased to 8.37/day in 1980. This increasing trend continued in 1981 season also when 16.15 nets caught 5.756 kg fish per day. A direct relationship was observed in the fishing efforts and catch. Tilapia, Clarias, Labeo, Schilbe and Synodontis spp, were the most predominant fish species in the catch and contributed more than 97% of the total fish harves
On similarity solutions for boundary layer flows with prescribed heat flux
This paper is concerned with existence, uniqueness and behavior of the
solutions of the autonomous third order nonlinear differential equation
on with the boundary conditions
, and . This problem arises when
looking for similarity solutions for boundary layer flows with prescribed heat
flux. To study solutions we use some direct approach as well as blowing-up
coordinates to obtain a plane dynamical system.Comment: v2: new page-settin
Optimal observables to determine entanglement of a two qubit state
Experimental determination of entanglement is important not only to
characterize the state and use it in quantum information, but also in
understanding complicated phenomena such as phase transitions. In this paper we
show that in many cases, it is possible to determine entanglement of a two
qubit state, as represented by concurrence, with a few observables, most of
which are local. In particular, rank 1 and rank 2 states need exclusively
measurement of local observables while rank 3 states need measurement of just
one correlation observable in addition to local observables. Only the rank 4
states are shown to require a more detailed tomography. The analysis also sheds
light on the other measure, non separability since it is a lower bound on
concurrence.Comment: 8 pages, 1 figur
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