Wheat Genomics: Present Status and Future Prospects (2008)
P. K. Gupta, R. R. Mir, A. Mohan, J. Kumar
Wheat (Triticum aestivum L.), with a large genome (16000 Mb) and high proportion (∼80%) of repetitive sequences, has been a difficult crop for genomics research. However, the...
High Tension Electric Current Injury and Silent Myocardial Infarction - A case report (2007)
A 55-year-old male, non-diabetic, sustained severe electric current injury as evidenced by the grievous exit wound on the left dorsum of foot as well as entry wound in both palms. There was silent...
Seismic bearing capacity for embedded footings on sloping ground (2006)
Seismic bearing capacity for embedded footings on sloping ground
Chittibabu, K. G., Li, L., Kamath, M., Kumar, J., Tripathy, S. K.
A new, solution processable, thiophene copolymer with a side chain nonlinear optical (NLO) chromophore namely Poly(3-octylthiophene-co-N-(3-thenyl) -4-amino-2-nitro phenol) (POMDT) has been...
Kim, W. H., Bihari, B., Moody, R., Kodali, N. B., Kumar, J., Tripathy, S. K.
The polymer chains of a novel asymmetric polydiacetylene, namely poly((8-butoxy carbonyl) methyl urethanyl) 1-(5-pyrimidyl)-octa-1,3-diyneD), in the absence of nonlinear optically active chromophores...
Kim, W. H., Bihari, B., Moody, R., Kodali, N. B., Kumar, J.
The polymer chains of a novel asymmetric polydiacetylene, namely poly((8-butoxy carbony)methyl urethanyl) 1-(5-pyrimidyl)-octa-1,3-diyne)(BPOD), in the absence of nonlinear optically active...
Nonlinear Optical Polymers Derived from Organic/Inorganic Composites (2006)
Tripathy, S. K., Kumar, J., Chen, J. I., Marturunkakul, S., Jeng, R. J., Li, L., ...
A general approach to the development of multicomponent multifunctional stable NLO materials based on sol-gel reactions has been discussed. We have shown that these second order NLO organic/inorganic...
Low Loss Second-Order Nonlinear Optical Polymers Based on All Organic Sol-Gel Materials (2006)
Jeng, R. J ., Hsiue, G. H., Chen, J. I., Marturunkakul, S., Li, L., Jiang, X. L., ...
A new class of all organic sol-gel second-order nonlinear optical (NLO) materials based on hexa(methoxymethyl)melamine (HMM) has been developed. Two NLO active chromophores,...
Novel Polydiacetylenes as Materials for Second and Third Order Nonlinear Optics (2006)
Kim, W. H., Bihari, B., Masse, C.E., Kumar, J., Tripathy, Sukany K.
The objective of this investigation was to develop stable nonlinear optical (NLO) materials which possess both second and third order NLO properties. These materials were envisioned as having a...
Marturunkakul, Sutiyao, Chen, Jeng I., Chen, Y. M., Kumar, J., Tripathy, Sukany K.
The relaxation of poled nonlinear optical (NLO) chromophores in polymer films was characterized by infrared reflection-absorption spectroscopy. Both a guest-host system and a photo-crosslinkable...
New Developments in Second-Order Nonlinear Optical Polymeric Materials (2006)
Tripathy, S. K., Kim, W. K., Bihari, B., Cheong, D. W., Kumar, J.
Second harmonic generation from the spin coated films of an asymmetrically substituted polydiacethlene, namely poly((8-butoxy cardonylmethyl urethanyl) 1-(5-pyrimidyl)-octa-1,3- diyne(BPOD) is...
In this paper a model for fluidized bed spray agglomeration is presented. To describe the processes of heat and mass transfer, a physical based model is derived. The model takes evaporation process...
Kumar, S. S., Kumar, R. S., Samuelson, L. A., Kumar, J., Kumar, J.
Organic materials have recently been recognized as promising candidates for nonlinear optics (NLO) applications in view of their fast response time and large non-resonant nonlinear effects in...
Raiders of the Lost AdS (2000)
We demonstrate that under certain conditions a theory of conformal quantum mechanics will exhibit the symmetries of two half-Virasoro algebras. We further demonstrate the conditions under which these...
Conformal Mechanics and the Virasoro Algebra (1999)
We demonstrate that any scale-invariant mechanics of one variable exhibits not only 0+1 conformal symmetry, but also the symmetries of a full Virasoro algebra. We discuss the implications for the...
Far Infrared Dielectric Properties of Polypyrrole Doped with the Tosylate Anion. (1998)
Phillips, G. C., Suresh, R., Chen, J. I., Kumar, J., Huang, J. C.
The dielectric constants and optical conductivities of films of conducting polypyrrole with different doping levels were investigated. Measurements were carried out in the far infrared region...
Dynamics Simulation of Langmuir-Blodgett Films. (1998)
Clough, S. B., Sun, X. F., Kumar, J., Tripathy, S.
Langmuir-Blodgett film monolayers are formed when amphiphilic molecules in solution are deposited on water surface followed by compression. During the compression, the randomly oriented molecules...
NonLinear Optical Spectroscopy of Polymers. (1998)
Tripathy, Sukant, Cavicchi, E., Kumar, J.
In linear optical spectroscopy, atomic and molecular structure is probed by light. The intensity, frequencies, and spectral width observed in the signal output from a sample--whether by reflection,...
Approaches to the Design of a Novel Macromolecular System with Tailored Optical Properties. (1998)
Tripathy, Sukant, Kumar, J., Kumar, S. S., Blumstein, A.
A systematic approach towards the development of polymeric nonlinear optical material has been presented. The optimally designed functional molecular elements are carefully assembled to incorporate...
Nonlinear Optics and Organic Materials. (1998)
Tripathy, Sukant, Cavicchi, E., Kumar, J., Saikumar, R.
In glancing through a flat windowpane we confront light's interaction with glass, but ignore it. We assume that the world's image is not perceptibly altered when light passes through the glass. Yet...
All Optical Switching Using Optical Fibers and Nonlinear Organic Liquids. (1998)
Domash, L., Lavin, P., Ahn, J., Kumar, J., Tripathy, S.
Nonlinear optical organic liquids based on 2-methyl-4 nitroaniline (MNA)-type molecule in solution are potentially practical as third-order materials, featuring a large and fast intensity dependent...
Molecular Design of Stable Second Order Nonlinear Optical Polymers. (1998)
Mandal, B. K., Tripathy, S., Kumar, J.
The temporal and thermal stability of second order nonlinear optical properties of polymers is an important issue in the development of polymeric electro-optic devices. This has been addressed by...
Optimized Processing Condition for a Photocrosslinkable Stable Nonlinear Optical Polymer. (1998)
Lee, J. Y., Kim, W. H., Mandal, B. K., Kumar, J., Tripathy, S. K.
The optimum processing condition for a photocrosslinking nonlinear optical (NLO) polymeric system was established. Parameters such as change in heat capacity at glass transition temperature, rate of...
Design and Synthesis of a New Class of Photocrosslinkable Nonlinear Optical Polymers. (1998)
Tripathy, S. K., Mandal, B. K., Jeng, R. J., Lee, J. Y., Kumar, J.
We have developed a new class of photocrosslinkable polymers with stable second and third order nonlinear optical (NLO) properties. The polymers have significant processing advantages over their...
Steady State and Transient Photoconductivity of Thin Film Polydiacetylene Single Crystals. (1998)
Yang, Y., Lee, J. Y., Miller, P., Li, L., Kumar, J.
Charge carrier generation and transport mechanisms in polydiacetyle ne thin film single crystals, poly-PTS (2,4-hexadiyne-1,6-diol bis(p-toluenesulfonate)) and poly-BTFP...
Photocross-Linked Second Order Nonlinear Optical Polymers. (1998)
Chen, Y. M., Mandal, B. K., Lee, J. Y., Miller, P., Kumar, J.
We report a novel method to obtain stable second order nonlinear optical (NLO) properties in polymeric thin films. Photocross-linking between the NLO active molecules and a photoreactive polymer is...
New Photocrosslinkable Polymers for Second Order Nonlinear Optical Processes. (1998)
Mandal, B. K., Jeng, R. J., Kumar, J., Tripathy, S.
Polymeric systems have been established as useful materials for second order nonlinear optical (NLO) processes, viz. frequency doubling, linear electro-optic effect, frequency mixing and parametric...
Samuelson, L. A., Miller, P., Galotti, D. M., Marx, K. A., Kumar, J.
This paper focuses on a novel methodology for the two-dimensional ordering of a photodynamic protein system using the Langmuir-Blodgett (LB) technique. The specific versus non-specific surface...
Optical and Electro-Optical Properties of a Photocross-Linkable Polymer. (1998)
Rahman, A. K., Mandal, B. K., Zhu, X. F., Kumar, J., Tripathy, S. K.
Planar waveguides from a photocross-linkable polymer have been fabricated on glass and SiO2 on silicon using the spin coating process. The polymer has been cross-linked by exposure to UV radiation...
New Photocrosslinking Polymers for Second Order Nonlinear Optical Processes. (1998)
Mandal, B. K., Jeng, R. J., Kumar, J., Tripathy, S.
Polymeric systems have been established as useful materials for second order nonlinear optical (NLO) processes, viz. frequency doubling, linear electro-optic effect, frequency mixing and parametric...
Stable Second-Order Optical Nonlinearity in Novel Photocrosslinkable Polymers. (1998)
Li, L., Zhu, X., Jeng, R. J., Chen, Y. M., Kumar, J.
Optical Characterization of novel photocrosslinkable second-order nonlinear optical (NLO) polymers are presented. These polymer systems have been designed with nonlinear optical moieties in the...
Jeng, R. J., Chen, Y. M., Mandal, B. K., Kumar, J., Tripathy, S. K.
Epoxy based material incorporating 4-(4'-nitrophenylazo) phenylamine has been synthesized and subsequently functionalized with cinnamoyl groups. These materials can be easily solution-processed into...
A New Guest-Host System: Towards Stable Second-Order Optical Nonlinearity. (1998)
Jeng, R. J., Chen, Y. M., Jain, A. K., Tripathy, S. K., Kumar, J.
A new guest-host system based on the azo dye disperse red 1 and phenyl siloxane polymer has been investigated. The second order susceptibility of the polymer cured at 220 deg C was found to be stable...
Third-Order Optical Nonlinearities in a Photocrosslinkable Polymer. (1998)
Li, L., Lee, J. Y., Zhu, X. F., Kumar, J., Tripathy, S. K.
Quadratic electro-optic coefficient measurements on a dye doped photocrosslinkable nonlinear optical (NLO) polymer-PVCN (polyvinylcinnamate)/CNNB-R...
Photoconductivity in a Photocrosslinkable Second Order Nonlinear Optical Polymer. (1998)
Li, L., Lee, J. Y., Yang, Y., Kumar, J., Tripathy, S. K.
Photoconductivity measurements on stable photocrosslinkable nonlinear optical polymer - PVCN (polyvinylcinnamate)/CNNB-R (3-cinnamoyloxy-4-4-(N,N-diethylamino)-2-cinnamoyloxy phenvlazo nitrobenzene)...
Photoprocessable Second Order Nonlinear Optical Polymers. (1998)
Kumar, J., Tripathy, S. K., Mandal, B. K., Chen, Y. M., Jeng, R. J.
Dye-doped polymers and polymers with covalently attached nonlinear-optical (NLO) moieties have demonstrated that large second-order susceptibilities in polymers are achievable. For practical...
Nonlinear Optical Properties of New Dye Doped Photocrosslinkable Polymers. (1998)
Tripathy, S., Li, L., Mandal, B. K., Lee, J. Y., Kumar, J.
Extensive studies have been made on poled Nonlinear Optical (NLO) guest-host systems. The limited solubility of the NLO species in a host matrix and the thermal relaxation of the induced nonlinear...
Novel Crosslinked Guest-Host System with Stable Second Order Nonlinearity. (1998)
Jeng, R., Chen, Y. M., Kumar, J., Tripathy, S.
An epoxy based nonlinear optical (NLO) polymeric material incorporating 4-(4'-nitrophenylazo) phenylamine has been synthesized and subsequently functionalized with acryloyl groups. A glass transition...
Dynamic Mechanical Behavior of Photocrosslinkable Nonlinear Optical Polymers. (1998)
Marturunkakul, S., Lee, J. Y., Sengupta, S. K., Kumar, J., Tripathy, S. K.
An easily processable photocrosslinking guest-host system with stable second o properties using polyvinylcinnamate as a host polymer has been developed. Samples were made as free standing films from...
Efficient Cerenkov Second-Harmonic Generation in Crosslinked Poled Polymer Waveguides. (1998)
Zhu, X. F., Chen, Y. M., Kamath, M., Jeng, R. J., Kumar, J.
This paper presents frequency doubling results by Cerenkov radiation from stable poled polymer slab waveguides. For a 1064 nm Nd-YAG laser, the harmonic wavelength is away from the strong absorption...
Li, L., Jeng, R. J., Kamath, M., Kumar, J., Tripathy, S. K.
Photoconductivity in photocrosslinkable second order nonlinear optical (NLO) polymeric materials and photovoltage generation in a poled guest-host polymer are reported. These NLO polymers have been...
Cerenkov Type Phase-Matched Second Harmonic Generation in Polymeric Channel Waveguides. (1998)
Chen, Y., Kamath, M., Jain, A., Kumar, J., Tripathy, S.
Fabrication of polymer channel waveguides by etching on glass is reported. Results on second harmonic generation (SHG) in the Cerenkov mode from stable poled polymeric channel waveguides are...
Functionalized Polymeric Materials for Electronics and Optics. (1998)
Sengupta, S., Kumar, J., Jain, A., Tripathy, S.
Polymeric materials are being developed to possess unique electronic and optical properties. A number of polymeric nonlinear optical polymers and electrically conducting polymers have been reported...
Chen, J. I., Marturunkakul, S., Chen, Y. M., Kumar, J., Tripathy, S. K.
The relaxation of poled nonlinear optical (NLO) chromophores in polymer films was characterized by infrared reflection-absorption spectroscopy. Both a guest-host system and a photocrosslinkable...
Marturunkakul, S., Kumar, J., Tripathy, S. K.
Polymeric materials with second order nonlinear optical (NLO) properties are of much interest for applications such as waveguide electrooptic modulation and frequency doubling devices. These NLO...
Dipolar Relaxation in a Second-Order Nonlinear Optical Interpenetrating Polymer Network. (1998)
Chen, J. I., Marturunkakul, S., Li, L., Jeng, R. J., Kumar, J.
The nature of the relaxation process of the poled order in an interpenetrating polymer network (IPN) system is found to be fundamentally different from that of a guest/host system. The IPN (Tg= 176...
Laser-Induced Holographic Surface Relief Gratings on Nonlinear Optical Polymer Films. (1998)
Kim, D. Y., Li, L., Kumar, J., Tripathy, S. K.
We report observation of holographic surface relief gratings with relatively large amplitude on a second order nonlinear optical polymeric material. Surface relief gratings on these polymer films...
An Interpenetrating Polymer Network for Second-Order Nonlinear Optics. (1998)
Li, L., Chen, J. I., Marturunkakul, S., Kumar, J., Tripathy, S. K.
The linear optical and second order nonlinear optical (NLO) properties of an interpenetrating polymer network (IPN) have been investigated. For the poled and cured IPN samples, large second order NLO...
Masse, C. E., Vande Wiede, K., Kim, W. H., Jiang, X. L., Kumar, J.
The objective of this investigation was to develop stable nonlinear optical (NLO) materials which possess both second and third order NLO properties. These materials were envisioned as having a...
Laser-Induced Holographic Surface Relief Gratings on Nonlinear Optical Polymer Films. (1998)
Kim, D. Y., Li, L., Kumar, J., Tripathy, S. K.
We report observation of holographic surface relief gratings with relatively large amplitude on a second order nonlinear optical polymeric material. Surface relief gratings on these polymer films...
Polarized Laser Induced Holographic Surface Relief Gratings on Polymer Films. (1998)
Kim, D. Y., Li, Lian, Shivshankar, V., Kumar, J., Tripathy, S. K.
Large amplitude holographic surface relief gratings on azobenzene containing polymer films were optically induced without any subsequent processing steps. The surface relief structures were observed...
Cheong, D. W., Kim, W. H., Samuelson, L. A., Kumar, J., Tripathy, S. K.
A soluble, asymmetric polydiacetylene has been shown to form stable monolayers at the air-water interface of a Langmuir trough. The monolayers of this unconventional amphiphilic polymer could be...
Jiang, X. L., Li, L., Kumar, J., Kim, D. Y., Shivshankar, V.
Experimental studies on the recording of surface relief gratings on azobenzene containing polymer films using laser beams with different polarizations were carried out. The results indicate that the...
Enzymatic Polymerization of Phenolic Biomonomers Derived from Cashew Nut Shell Liquid (CNSL). (1998)
Alva, K. S., Nayak, P. L., Kumar, J., Tripathy, S. K.
Enzymatic polymerization of alkyl phenols derived from a renewable resource, viz. cashew nut shell, has been carried out in dioxane-water mixture. The reaction and reaction products have been...
Dispersion of X(3) in Polydiacetylene Films from Electroabsorption Spectroscopy (1998)
Yang, K., Kim, W., Li, L., Tripathy, S., Kumar, J.
Electroabsorption spectroscopy was carried out on a polydiacetylene, poly?8-BUTOXY CARBONYL methyl urethanyl 1-(5-pyrimidyl) -octa-1, 3-diyne! (poly(BPOD)) film from 470nm to 730nm, and on a...
Yang, K., Cheong, D. W., Tripathy, S., Kumar, J.
The relation between the dispersions of nonlinear optical susceptibilities X(n)(w;w,0...0) and X(n-1)(w;w,0...0) (for electro-optic process) of organic polymeric materials is studied based on the...
Optical Properties of Distyrylbenzene Chromophores and Their Segmented Copolymers (1998)
Benfaremo, N., Sandman, D. J., Tripathy, S., Kumar, J., Yang, K.
A new segmented polymer (3) consisting of a distyrylbenzene chromophore separated by polyethylene glycol segments has been