1,547 research outputs found
Economic Analysis of Sub-Surface Drainage under Indira Gandhi Nahar Priyojna Command Area - A Case Study
This paper has attempted to ascertain whether the sub-surface drainage (SSD) in waterlogged and saline lands of Indira Gandhi Nahar Priyojna Command area is a cost-effective technique. The study has shown that waterlogging adversely affects crop yields. The cost on SSD installation in the command area comes out to be Rs 23767 per hectare. The returns on crop yields before and after the drainage system have been compared. Land utilization has been intensified after the installation of drainage, as a sizeable area of formerly fallow land has been brought under cultivation. The B-C ratio and the NPV have been found as 2.44 and Rs 34275/ha, respectively. The IRR has been found to be 25.88 per cent. These indicators have well established the financial feasibility of the project in the IGNP area.Resource /Energy Economics and Policy,
Optimal relaxed causal sampler using sampled-date system theory
This paper studies the design of an optimal relaxed causal sampler using sampled data system theory. A lifted frequency domain approach is used to obtain the existence conditions and the optimal sampler. A state space formulation of the results is also provided. The resulting optimal relaxed causal sampler is a cascade of a linear continuous time system followed by a generalized sampler and a discrete system
Dielectric breakdown and avalanches at non-equilibrium metal-insulator transitions
Motivated by recent experiments on the finite temperature Mott transition in
VO2 films, we propose a classical coarse-grained dielectric breakdown model
where each degree of freedom represents a nanograin which transitions from
insulator to metal with increasing temperature and voltage at random thresholds
due to quenched disorder. We describe the properties of the resulting
non-equilibrium metal-insulator transition and explain the universal
characteristics of the resistance jump distribution. We predict that by tuning
voltage, another critical point is approached, which separates a phase of
"bolt"-like avalanches from percolation-like ones.Comment: 4 pages, 3 figure
Fracture strength: Stress concentration, extreme value statistics and the fate of the Weibull distribution
The fracture strength distribution of materials is often described in terms
of the Weibull law which can be derived by using extreme value statistics if
elastic interactions are ignored. Here, we consider explicitly the interplay
between elasticity and disorder and test the asymptotic validity of the Weibull
distribution through numerical simulations of the two-dimensional random fuse
model. Even when the local fracture strength follows the Weibull distribution,
the global failure distribution is dictated by stress enhancement at the tip of
the cracks and sometimes deviates from the Weibull law. Only in the case of a
pre-existing power law distribution of crack widths do we find that the failure
strength is Weibull distributed. Contrary to conventional assumptions, even in
this case, the Weibull exponent can not be simply inferred from the exponent of
the initial crack width distribution. Our results thus raise some concerns on
the applicability of the Weibull distribution in most practical cases
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