170 research outputs found
Erratum: Cloaking using anisotropic multilayer circular cylinder (AIP Advances (2020) 10 (095312) DOI: 10.1063/5.0012769)
No full textCo-author Mehwish Nisar should have had an additional affiliation noted in the byline of our original manuscript.1 The correct affiliations for this manuscript are as listed above
Investor influence in portfolio company growth and development strategy
No full textThe author empirically investigates these ideas, especially how investors, through a network of contacts, affect portfolio company growth and development
Hydraulic simulations to evaluate and predict design and operation of the Chashma Right Bank Canal
No full textIrrigation systems / Irrigation canals / Flow control / Velocity / Canal regulation techniques / Hydraulics / Simulation models / Design / Operations / Crop-based irrigation / Distributary canals / Water delivery / Policy / Protective irrigation / Water allocation / Water requirements / Sedimentation / Water distribution / Equity / Water conveyance / Pakistan / Chashma Right Bank Canal
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Everyday Energy Transitions in Pakistan
No full textHamza Jilani interviews his maternal grandfather, Nisar A. Memon, about the energy transformations he has witnessed in Pakistan during his lifetime. Memon describes changes in transportation, including the decline of the colonial-era tram in Karachi and the family's car. He discusses the early arrival of electricity in the city, and the continued reliance on wood and coal by people unable to afford kerosene to cook with. He notes changing dietary practices around eating meat, the local nature of food production, and everyday practices of accessing water. He discusses animal-powered transportation and the colonial lineage of the port. Finally, Memon recalls his time working in Kuwait, when he was involved in the "Kuwaitization" of IBM and saw the rapid transformation of the country due to new oil wealth
A Novel Reversible Watermarking Method based on Adaptive Thresholding and Companding Technique
No full textEmbedding and extraction of a secret information as
well as the restoration of the original un-watermarked image is
highly desirable in sensitive applications like military, medical, and
law enforcement imaging. This paper presents a novel reversible
data-hiding method for digital images using integer to integer
wavelet transform and companding technique which can embed and
recover the secret information as well as can restore the image to its
pristine state. The novel method takes advantage of block based
watermarking and iterative optimization of threshold for companding
which avoids histogram pre and post-processing. Consequently, it
reduces the associated overhead usually required in most of the
reversible watermarking techniques. As a result, it keeps the
distortion small between the marked and the original images.
Experimental results show that the proposed method outperforms the
existing reversible data hiding schemes reported in the literature
Study of moldboard and chisel plow action on the properties of compacted soil, crop growth and plant yield.
No full textExperiments with subsurface irrigation and drainage on a sandy soil in Quebec
No full textField experiments were conducted on St-Samuel sandy loam soil in 1982 and 1983, with eight replicates of irrigated and non-irrigated maize plots. Soil moisture regime, root density and maize yields were determined to demonstrate the effect of subsurface irrigation and drainage systems.Laboratory experiments were conducted on large and small undisturbed soil cores to determine pertinent soil properties, relating drainable volume and steady upward flux to water table depth.A water balance model was developed and used with a stress-day-index to predict water table depth, excessive and deficit soil moisture conditions and effects on corn yield. Economic analyses were made to identify subsurface irrigation/drainage designs which optimize the profit for a corn crop.A simple method based on first and second order moments was proposed to determine the effects of parameter uncertainty in the relationship of steady upward flux vs water table depth on subsurface irrigation/drainage design parameters.Based on the above information, a realistic subsurface irrigation/drainage design was proposed and operational recommendations were made for an example field
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