486 research outputs found
Reliability and need for standardisation of electrical systems in small wooden fishing vessels
The working condition and atmosphere in a wooden fishing vessel are generally most injurious to the electrical systems. Therefore great care has to be taken in designing electrical systems for small c1afts. This paper deals with the difficult operating conditions and standardisation of electrical systems as applicable to small fishing vessels
Modified water spray chumming system for pole and line fishing of tuna
A water spray chumming system consisting of a 65 x 50 mm centrifugal pump driven by the propulsion engine through a PTO clutch and 'V' pulley power transmission system has been developed for the pole and line fishing of tuna. Water is sprayed through pipe loop system fitted on the edge of the fishing platform of the boat through small holes. The distance of the spray length can be adjusted by controlling the flow of the pump discharge water through a wheel valve
Development of an electric shrimp trawl 1. Reaction of shrimps to low volt direct current
Preliminary attempts were made to assess the effect of direct current on shrimps and to see whether the shrimp could be guided in large numbers into the fishing net by using a current of appropriate voltage without scattering them away as it happens at present. This communication is the first in the series of studies and primarily deals with laboratory equipment and experimental procedures followed
A general theory of intertemporal decision-making and the perception of time
Animals and humans make decisions based on their expected outcomes. Since
relevant outcomes are often delayed, perceiving delays and choosing between
earlier versus later rewards (intertemporal decision-making) is an essential
component of animal behavior. The myriad observations made in experiments
studying intertemporal decision-making and time perception have not yet been
rationalized within a single theory. Here we present a
theory-Training--Integrated Maximized Estimation of Reinforcement Rate
(TIMERR)--that explains a wide variety of behavioral observations made in
intertemporal decision-making and the perception of time. Our theory postulates
that animals make intertemporal choices to optimize expected reward rates over
a limited temporal window; this window includes a past integration interval
(over which experienced reward rate is estimated) and the expected delay to
future reward. Using this theory, we derive a mathematical expression for the
subjective representation of time. A unique contribution of our work is in
finding that the past integration interval directly determines the steepness of
temporal discounting and the nonlinearity of time perception. In so doing, our
theory provides a single framework to understand both intertemporal
decision-making and time perception.Comment: 37 pages, 4 main figures, 3 supplementary figure
The narcotising impulse threshold values of certain fresh water fishes
The effect of impulse current on the fish at a particular impulse rate and voltage depends on the size and kind of the fish. It is directly proportional to the temperature and inversely proportional to the conductivity of the medium
Combinatorial Multi-Access Coded Caching: Improved Rate-Memory Trade-off with Coded Placement
This work considers the combinatorial multi-access coded caching problem
introduced in the recent work by Muralidhar \textit{et al.} [P. N. Muralidhar,
D. Katyal, and B. S. Rajan, ``Maddah-Ali-Niesen scheme for multi-access coded
caching,'' in \textit{IEEE Inf. Theory Workshop (ITW)}, 2021] The problem
setting consists of a central server having a library of files and
caches each of capacity . Each user in the system can access a unique set of
caches, and there exist users corresponding to every distinct set of
caches. Therefore, the number of users in the system is . For the
aforementioned combinatorial multi-access setting, we propose a coded caching
scheme with an MDS code-based coded placement. This novel placement technique
helps to achieve a better rate in the delivery phase compared to the optimal
scheme under uncoded placement, when . For a lower memory regime, we
present another scheme with coded placement, which outperforms the optimal
scheme under uncoded placement if the number of files is no more than the
number of users. Further, we derive an information-theoretic lower bound on the
optimal rate-memory trade-off of the combinatorial multi-access coded caching
scheme. Finally, using the derived lower bound, we show that the first scheme
is optimal in the higher memory regime, and the second scheme is optimal if
.Comment: 15 pages and 5 figure
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