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  • 1
    Electronic Resource
    Electronic Resource
    Surface-Induced Asymmetries during Spinodal Decomposition in Off-Critical Polymer Mixtures (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 6768-6776 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00101a015
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  • 2
    Electronic Resource
    Electronic Resource
    High power, high efficiency optically pumped NH3 lasers (1990)
    Springer
    Applied physics 51 (1990), S. 371-373 
    Details
    ISSN: 1432-0649
    Keywords: 33.80.Be ; 42.55.Hq ; 42.60.By
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A simple and efficient NH3 laser was tuned over more than 70 vibrational band transitions between 10.08 and 14.14 μm. The active medium was a dilute mixture of ammonia in argon and was optically pumped by the 9R(30) transition of a pulsed TEA-CO2 laser. Output energies greater than 1 J per pulse were observed on several of the strongest lines. In a non-selective cavity an energy conversion efficiency of greater than 35% was obtained with a maximum output energy of 4.6J. Optically pumped NH3 is shown to be a flexible and efficient system for the downconversion of CO2 radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348975
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  • 3
    Electronic Resource
    Electronic Resource
    Modified braid equations for SOq(3) and noncommutative spaces (2002)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 43 (2002), S. 1569-1583 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: General solutions of the R(circumflex)TT equation with a maximal number of free parameters in the specrtal decomposition of vector SOq(3) R(circumflex) matrices are implemented to construct modified braid equations (MBE). These matrices conserve the given, standard, group relations of the nine elements of T, but are not constrained to satisfy the standard braid equation (BE). Apart from q and a normalization factor our R(circumflex) contains two free parameters, instead of only one such parameter for deformed unitary algebras studied in a previous paper [Math. QA/0009178] where the nonzero right hand side of the MBE had a linear term proportional to (R(circumflex)(12)−R(circumflex)(23)). In the present case the rhs is, in general, nonlinear. Several particular solutions are given (Sec. II) and the general structure is analyzed (Appendix A). Our formulation of the problem in terms of projectors yields also two new solutions of standard (nonmodified) braid equation (Sec. II) which are further discussed (Appendix B). The noncommutative three-spaces obtained by implementing such generalized R(circumflex) matrices are studied (Sec. III). The role of coboundary R(circumflex) matrices (not satisfying the standard BE) is explored. The MBE and Baxterization are presented as complementary facets of the same basic construction, namely, the general solution of R(circumflex)TT equation (Sec. IV). A new solution is presented in this context. As a simple but remarkable particular case a nontrivial solution of BE is obtained (Appendix B) for q=1. This solution has no free parameter and is not obtainable by twisting the identity matrix. In the concluding remarks (Sec. V), among other points, generalization of our results to SOq(N) is discussed. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1413225
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  • 4
    Electronic Resource
    Electronic Resource
    Implementation of an iterative map in the construction of (quasi)periodic instantons: Chaotic aspects and discontinuous rotation numbers (1999)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 40 (1999), S. 635-673 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: An iterative map of the unit disk in the complex plane is used to explore certain aspects of self-dual, four-dimensional gauge fields (quasi)periodic in the Euclidean time. These fields are characterized by two topological numbers and contain standard instantons and monopoles as different limits. The iterations do not correspond directly to a discretized time evolution of the gauge fields. They are implemented in an indirect fashion. First, (t,r,θ,φ) being the standard coordinates, the (r,t) half-plane is mapped on the unit disk in an appropriate way. This provides an (r,t) parametrization of Z0, the starting point of the iterations and makes the iterates increasingly complex functions of r and t. These are then incorporated as building blocks in the generating function of the fields. We explain in what sense and to what extent some remarkable features of our map (indicated in the title) are thus carried over into the continuous time development of the fields. Special features for quasiperiodicity are studied. Spinor solutions and propagators are discussed from the point of view of the mapping. Several possible generalizations are indicated. Some broader topics are also discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.532680
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  • 5
    Electronic Resource
    Electronic Resource
    Canonical structure in SO(4)q and relations to E(3)q and SO(3,1)q (1993)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 34 (1993), S. 1964-1985 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Starting with the SU(2)q⊗SU(2)q basis and using q-CG coefficients the closest possible q deformation of the classical canonical Gelfand–Zetlin formalism is constructed explicitly for SO(4)q. Simple introduction of q brackets for each factor of the classical matrix elements, valid for SU(n)q, is shown to need significant and unexpected modifications for SO(n)q even when n=4. Contraction to E(3)q and continuation to SO(3,1)q are studied, making explicit the possibilities and the problems that arise. Periodic representations for q, a root of unity, are commented upon briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.530149
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  • 6
    Electronic Resource
    Electronic Resource
    How overdetermined are the generalized self-duality relations? (1991)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 32 (1991), S. 2532-2539 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: It is shown that the self-duality equations of the generalized Yang–Mills (GYM) models are overdetermined except when they are subjected to the spherical or axial symmetry. It is also found that the Bogomol'nyi equations on Rd, of the GYM–Higgs (GYM–H) models descended from the GYM system on Rd×S8−d, are overdetermined for d=3,4,5, and 6 only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.529147
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  • 7
    Electronic Resource
    Electronic Resource
    q-analogs of IU(n) and U(n,1) (1991)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 32 (1991), S. 1227-1234 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The starting point is the nonsemisimple, inhomogeneous Lie algebra Un×I2n [denoted also as IU(n)], where I2n represents an Abelian subalgebra in semidirect product with the homogeneous part U(n). This is realized by explicitly giving the matrix elements of the generators on a modified Gelfand–Zetlin basis that allows representations of infinite dimensions. The enveloping algebra is q lifted by introducing q brackets in the matrix elements giving Uq(IU(n)). The deformation of the Abelian structure of I2n is studied for q≠1. Some implications are pointed out. The important invariants are constructed for arbitrary n. The results are compared to the corresponding ones for Jimbo's construction of Uq (U(n+1)) on a Gelfeld–Zetlin basis. Finally, the related construction of Uq(U(n,1)) is presented and discussed. Here, Uq(SU(1,1)), the q-analog of relativistic motion in a plane, is analyzed in the context of this formalism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.529319
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  • 8
    Electronic Resource
    Electronic Resource
    Geometry of linear pairs for self-dual gauge fields (1990)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 31 (1990), S. 1643-1651 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: A linear pair for self-dual gauge fields is constructed for the metric ds2=gzz¯dzdz¯+gyy¯dyd¯. It is shown that for consistency gzz¯ and gyy¯, apart from a possible overall conformal factor, are given in terms of two Liouville fields of equal and opposite curvatures. The null surface corresponding to the pair and the homogeneous solutions, playing a fundamental role, are constructed explicitly. The five-dimensional space of y,y¯,z,z¯ and the spectral parameter λ is studied. The proper transformation of λ corresponding to holomorphic ones of y and z is found. Known monopole, instanton, and (quasi)periodic solutions are all shown to emerge systematically as particular cases of our formalism. As examples of new possibilities, the case of accelerated observers and that of cosmic string backgrounds are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528709
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  • 9
    Electronic Resource
    Electronic Resource
    Contact dermatitis in agricultural workers: rôle of common crops fodder and weeds (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 35 (1996), S. 0 
    Details
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0536.1996.tb02428.x
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  • 10
    Electronic Resource
    Electronic Resource
    Common contact sensitizers in Chandigarh, India (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 38 (1998), S. 0 
    Details
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 200 patients (122 male, 78 female) with suspected allergic contact dermatitis were patch tested with the European standard series (ESS) and the results compared with other Asian centres. 131 (65.5%) patients showed 1 or more patch test positives to the ESS. Patch tests were positive to all allergens except primin. Potassium dichromate was the most common allergen (20.5%) followed by nickel sulfate (16.5%), SQL mix (14%), PPD (11.5%), cobalt (8%), fragrance mix (7.5%), formaldehyde (6.5%), colophony (5.5%), neomycin sulfate and mercapto mix (5% each). In women, nickel sulfate was the commonest allergen (30.8%) followed by SQL mix (16.7%) and potassium dichromate (15.4%). In men, potassium dichromate was the commonest sensitizer (23.8%) followed by SQL mix and PPD (12.3% each). Our results are at variance with other centres in Asia. SQL mix was able to detect less than ½ (42.2%) of patients allergic to ethanolic dilutions of ether extracts of parthenium. We conclude that the European standard series, with exclusion of primin, is suitable for detection of allergic contact dermatitis in India. However, SQL mix is not a adequate screen for parthenium sensitivity and patch testing with extracts of the plant should be continued, wherever indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0536.1998.tb05677.x
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