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  • 1
    Electronic Resource
    Electronic Resource
    Photoluminescence spectroscopy and the effective mass theory of strained (In,Ga)As/GaAs heterostructures grown on (112)B GaAs substrates (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 843-848 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The photoluminescence characteristics of pseudomorphic In0.19Ga0.81As/GaAs quantum well structures grown on both the conventional (001) and the unconventional (112)B GaAs substrate are investigated. It is found that the emission spectra of the structures grown on the (112)B surface exhibit some spectral characteristics not observed on similar structures grown on the (001) surface. A spectral blue shift of the e→hh1 transition with increasing optical pump intensity is observed for the quantum wells on the (112) surface. This shift is interpreted to be evidence of a strain-induced piezoelectric field. A second spectral feature located within the band gap of the In0.19Ga0.81As layer is also observed for the (112) structure; this feature is thought to be an impurity-related emission. The expected transition energies of the quantum well structures are calculated using the effective mass theory based on the 4×4 Luttinger valence band Hamiltonian, and a related strain Hamiltonian. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359009
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  • 2
    Electronic Resource
    Electronic Resource
    Strain and crystallographic orientation effects on interband optical matrix elements and band gaps of [11l ]-oriented III-V epilayers (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 2447-2455 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a derivation of the 4×4 Luttinger valence band and Bir–Pikus strain Hamiltonians valid for any [11l]-oriented epilayers. It is shown that epitaxial layers grown on substrates oriented in certain of the [11l] directions exhibit anisotropic optical transition matrix elements. This anisotropy is predicted to have its maximum for the (110) surface. For pseudomorphic epitaxial layers, calculations indicate that the zone center band gap of these structures is changed due to the effects of strain, with the largest changes occurring for those structures grown on the (111) surface. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360098
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  • 3
    Electronic Resource
    Electronic Resource
    Effective mass theory for III-V semiconductors on arbitrary (hkl) surfaces (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2029-2037 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of arbitrary substrate orientation on the electronic and optical properties of III-V zinc-blende semiconductors are considered. A unitary transformation matrix is used to rotate the 4×4 Luttinger valence band Hamiltonian, and the Bir-Pikus strain Hamiltonian from the conventional (001) surface to any arbitrary (hkl) surface of interest. The effects of strain on several electronic and optical properties are examined. It is found that the strain-induced change in the forbidden gap is largest for the (111) plane and other equivalent planes. Furthermore, the strain is also found to induce both a longitudinal and a transverse piezoelectric field. The longitudinal field reaches a maximum for the (111) surface and its other equivalent planes, while the transverse field reaches a maximum for the (110) surface and its other equivalent planes. The orientation-dependence of the hole effective masses is also examined; it is found that the (111) surface, and other equivalent planes, exhibits the largest heavy-hole mass among all possible planes. Finally, this article examines the effects of orientation on the optical transition matrix elements. For incident light with in-plane polarization vectors, the matrix elements are, in general, anisotropic—with the largest anisotropies predicted for two new surfaces: the ((square root of)310) and the (1(square root of)30) surface. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361057
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  • 4
    Electronic Resource
    Electronic Resource
    TRANSFER OF LIMECYCLINE AND CEPHALORIDINE FROM MOTHER TO FETUS—A COMPARATIVE STUDY (1970)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 77 (1970), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Limecycline was given by mouth 6-hourly and cephaloridine was given intramuscularly 12-hourly in two doses to 60 women undergoing amniotomy for induction of labour in order to study the absorption and transfer of the antibiotics to the fetus as a protection against intrapartum infections.Both drugs were shown to provide useful inhibitory concentrations in maternal serum, amniotic fluid and umbilical cord blood.The advantages and disadvantages of the two drugs, and the appropriate dose schemes for each antibiotic are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1970.tb03515.x
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  • 5
    Electronic Resource
    Electronic Resource
    Reaction of diethyl pyrocarbonate with nucleic acid components. Adenosine (1971)
    s.l. : American Chemical Society
    Biochemistry 10 (1971), S. 3335-3342 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00794a003
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  • 6
    Electronic Resource
    Electronic Resource
    The Role of Neighboring Groups in Replacement Reactions. VII. The Methoxyl Group (1943)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 65 (1943), S. 2196-2200 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01251a054
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  • 7
    Electronic Resource
    Electronic Resource
    Renormalized contact potential in two dimensions (1998)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 39 (1998), S. 749-759 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: We obtain for the attractive Dirac δ-function potential in two-dimensional quantum mechanics a renormalized formulation that avoids reference to a cutoff and running coupling constant. Dimensional transmutation is carried out before attempting to solve the system, and leads to an interesting eigenvalue problem in N−2 degrees of freedom (in the center of momentum frame) when there are N particles. The effective Hamiltonian for N−2 particles has a nonlocal attractive interaction, and the Schrodinger equation becomes an eigenvalue problem for the logarithm of this Hamiltonian. The three-body case is examined in detail, and in this case a variational estimate of the ground-state energy is given. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.532350
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  • 8
    Electronic Resource
    Electronic Resource
    Renormalized path integral in quantum mechanics (1997)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 38 (1997), S. 2171-2180 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: We obtain direct, finite, formulations of a renormalized quantum mechanical system with no reference to ultraviolet cutoffs and running coupling constants, in both the Hamiltonian and path integral pictures. The path integral description requires a modification to the Wiener measure on continuous paths that describes an unusual diffusion process wherein colliding particles occasionally stick together for a random interval of time before going their separate ways. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.531967
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  • 9
    Electronic Resource
    Electronic Resource
    Yang–Mills theory on a cylinder coupled to point particles (1994)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 35 (1994), S. 3845-3865 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: A model of quantum Yang–Mills theory with a finite number of gauge invariant degrees of freedom is studied. The gauge field has only a finite number of degrees of freedom since it is assumed that space–time is a two-dimensional cylinder. The gauge field is coupled to matter, modeled by either one or two nonrelativistic point particles. These problems can be solved without any gauge fixing, by generalizing the canonical quantization methods of S. G. Rajeev [Phys. Lett. B 212, 203 (1988)] to the case including matter. For this, the geometry of the space of connections is used, which has the structure of a principal fiber bundle with an infinite-dimensional fiber. Both problems are reduced to finite-dimensional, exactly solvable, quantum mechanics problems. In the case of one particle, it is found that the ground state energy will diverge in the limit of infinite radius of space, consistent with confinement. In the case of two particles, this does not happen if they can form a color singlet bound state ("meson'').
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.530451
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  • 10
    Electronic Resource
    Electronic Resource
    Enhanced corrosion resistance in noble metal containing amorphous chromium alloys (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1724-1726 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The addition of noble metals to Cr-based amorphous alloys can dramatically improve their corrosion resistance. The results of x-ray photoemission spectroscopy and cathodic polarization measurements show that the noble metals concentrate on the surface of the alloys and affect both the cathodic and anodic reaction kinetics. The amorphous Cr alloys require far less noble metal content to provide corrosion resistance in HCl compared to the corresponding crystalline Cr alloys. This allows the development of amorphous Cr alloys that are extremely stable in both reducing and oxidizing acids at high temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102317
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