A5021663676- Seismic Imaging and Inversion Techniques
- Hydraulic Fracturing and Reservoir Analysis
- Seismic Waves and Analysis
- Agricultural pest management studies
- Potato Plant Research
- Plant tissue culture and regeneration
- Genetic and Environmental Crop Studies
- Plant Pathogens and Resistance
- Agronomic Practices and Intercropping Systems
- Drilling and Well Engineering
- Astro and Planetary Science
- Magnetic properties of thin films
- Magnetic and transport properties of perovskites and related materials
- Credit Risk and Financial Regulations
- Spacecraft and Cryogenic Technologies
- High Entropy Alloys Studies
- Blind Source Separation Techniques
- Cassava research and cyanide
- Hydrocarbon exploration and reservoir analysis
- Pacific and Southeast Asian Studies
- Magnetic Properties and Synthesis of Ferrites
- Electromagnetic wave absorption materials
- Multiferroics and related materials
- Visual Attention and Saliency Detection
- Aluminum toxicity and tolerance in plants and animals
Bhabha Atomic Research Centre
2022-2025
Homi Bhabha National Institute
2022-2025
Bangladesh Agricultural Research Institute
2020-2022
Bidhan Chandra Krishi Viswavidyalaya
2017
University of Oklahoma
1999-2014
Colorado School of Mines
2000-2006
Central Potato Research Institute
1997-2004
AT&T (United States)
1997
Nonhydrostatic stress, an often‐ignored source of seismic anisotropy, is universally present in the subsurface and may be as common intrinsic or fracture‐induced anisotropy. applied to initially transversely isotropic solid with vertical symmetry axis (VTI), results effective medium having almost orthorhombic (provided that one principal stresses aligned axis). The planes observed this are orientations stresses, anisotropic parameters (ε (1,2) , δ (1,2,3) γ ) can reveal information about...
Societal Impact Statement Lentil is a staple in many diets around the world and growing popularity as quick‐cooking, nutritious, plant‐based source of protein human diet. varieties are usually grown close to where they were bred. Future climate change scenarios will result increased temperatures shifts lentil crop production areas, necessitating expanded breeding efforts. We show how we can use daylength temperature model identify most likely succeed these new environments, expand genetic...
PNR data for a Ni/Gd multilayer in front (a) and back (b) surface reflectivity modes are presented. The corresponding magnetization depth profiles (c) (d) indicate helical at interfaces room temperature.
One of the main challenges in anisotropic velocity analysis and imaging is simultaneous estimation gradients parameters from reflection data. Approximating subsurface by a factorized VTI (transversely isotropic with vertical symmetry axis) medium provides convenient way building vertically laterally heterogeneous models for prestack depthmigration. The algorithm P‐wave migration (MVA) introduced here designed composed layers or blocks constant lateral V P0 . MVA method implemented as an...
Conventional semblance velocity analysis is equivalent to modeling prestack seismic data with events that have hyperbolic moveout but no amplitude variation offset (AVO). As a result of its assumption independent offset, this method might be expected perform poorly for strong AVO—especially polarity reversals at large such as reflections from tops some class 1 and 2 sands. We find substantial even phase change do not compromise the conventional measure greatly. Polarity reversal, however,...
Velocity analysis using semblance estimates velocities based on a constant amplitude model for seismograms and does not take variation with offset (AVO) into account. In the presence of AVO, becomes inaccurate, particularly events which exhibit polarity reversals. An AVO sensitive velocity procedure, is generalization traditional method, can be devised by giving an dependence to modeled seismograms. Incorporating requires additional parameters describe reflectivity. This results in reduced...
Sago, a processed (gelatinized) edible starch, was successfully used as gelling agent in culture medium. The efficacy of sago-gelled (80 g dm-3) medium studied ten potato (Solanum tuberosum L.) genotypes during micropropagation and minimal growth conservation. Sago starch provided firm surface throughout the entire period, fostered optimum plantlet terms shoot height, number nodes per plant, leaves fresh mass. No softening occurred over prolonged (six months) storage. study showed that sago...
Because events in image gathers generated after prestack depth migration are sensitive to the velocity field, they often used analysis for isotropic media. Here, we present an analytic and numerical study of P‐wave transversely media with a vertical symmetry axis (VTI) establish conditions flattening such positioning them at true reflector depth. Application weak‐anisotropy approximation leads concise expressions reflections from homogeneous factorized v(z) terms VTI parameters gradient k z...
ABSTRACT Although it is widely recognized that anisotropy can have a significant influence on the focusing and positioning of migrated reflection events, conventional depth imaging methods still operate with isotropic velocity fields. Here, we present an application 2D migration analysis (MVA) algorithm, designed for factorized v ( x , z ) VTI (transversely vertical symmetry axis) media, to offshore data set from West Africa. By approximating subsurface blocks, possible decouple spatial...
The effect of different hermetic and non-hermetic closure-types (aluminum foil, cotton bung, plug, polypropylene cap Steristopper) on potato (Solanum tuberosum L.) plantlets growth chlorophyll contents was studied in three genotypes belonging to maturity groups. Plantlets grown culture tubes closed with aluminum foils caps had higher fresh mass shoot length, but lower contents, senescence index various morphological abnormalities. Non-hermetic closures like plugs Steristoppers were found...
Legumes in Conservation Agriculture (CA) have the potential to increase crop productivity and sustainability of rice-based system. However, there is limited information available on importance legume crops CA system Eastern Indo-Gangetic Plain (EIGP). Rice-based cropping mainstay people Bangladesh, EIGP. These systems are major food supplier region. In addition, they provide income employment opportunities majority facing unprecedented challenges increased risk due water, energy, labour...
AT&T Capital Corporation, the largest publicly held leasing and financing company in US, owns manages over $12 billion assets. In 1992, we began work to enhance viability profitability of its small-ticket business. We designed three sets decision automation systems associated strategies for front-end credit decisions, life-cycle credit-line management, delinquent account collections. The majority (73 percent) credit-granting decisions Capital's business are now made automatically,...
Abstract Lentil ( Lens culinaris Medik) is the third‐most important grain legume in world. In Bangladesh, it for human food and nutrition, animal feed, sustainable rice‐based cropping systems. However, lentil area declining due to competition with other winter spring crops, particularly irrigated rice (boro rice; Oryza sativa L.). To increase production, extra‐early (<95 d) line LRIL‐22‐70 was selected grow short fallow period between monsoon under a proposed new pattern. identified from...
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Plasmonic photocatalysts can catalyze chemical reactions using visible and infrared light, but their widespread adoption is hindered by the limited availability of noble plasmonic metals challenges associated with engineering nanostructures in large quantities. To address these challenges, a method developed for rapidly synthesizing an efficient photocatalyst derived from earth-abundant metal: copper. The widely utilized industrial technique spray-drying used one-step synthesis copper...
PreviousNext No AccessSEG Technical Program Expanded Abstracts 2003Migration velocity analysis in factorized VTI mediaAuthors: Debashish SarkarIlya TsvankinDebashish SarkarDepartment of Geophysics, Colorado School Mines and Ilya TsvankinDepartment Mineshttps://doi.org/10.1190/1.1817741 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Permalink: https://doi.org/10.1190/1.1817741FiguresReferencesRelatedDetails SEG...
Although it is widely recognized that anisotropy can have a significant influence on the focusing and positioning of migrated reflection events, conventional imaging methods still operate with isotropic velocity fields. Here, we present an application migration analysis (MVA) algorithm designed for factorized v(x, z) VTI (transversely vertical symmetry axis) media to offshore data set from West Africa. By approximating subsurface blocks, possible decouple spatial variations in anisotropic...
PreviousNext No AccessSEG Technical Program Expanded Abstracts 1999AVO and velocity analysisAuthors: Debashish SarkarBill LambJohn CastagnaDebashish SarkarInstitute for Exploration Development Geosciences, University Of Oklahoma, Bill LambInstitute John CastagnaInstitute Oklahomahttps://doi.org/10.1190/1.1821160 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Permalink:...