7,694 research outputs found
Evolution from Non-Fermi to Fermi Liquid Transport Properties by Isovalent Doping in BaFe2(As1-xPx)2 Superconductors
The normal-state charge transport is studied systematically in high-quality
single crystals of BaFe(AsP) (). By
substituting isovalent P for As, the spin-density-wave (SDW) state is
suppressed and the dome-shaped superconducting phase ( K)
appears. Near the SDW end point (), we observe striking linear
temperature () dependence of resistivity in a wide -range, and remarkable
low- enhancement of Hall coefficient magnitude from the carrier number
estimates. We also find that the magnetoresistance apparently violates the
Kohler's rule and is well scaled by the Hall angle as
. These non-Fermi liquid
transport anomalies cannot be attributed to the simple multiband effects. These
results capture universal features of correlated electron systems in the
presence of strong antiferromagnetic fluctuations.Comment: 4 pages, 4 figure
Microscopic Model for Photoinduced Magnetism in the Molecular Complex Perchlorate
A theoretical model for understanding photomagnetism in the heptanuclear
complex perchlorate is developed. It is a
many-body model involving the active orbitals on the transition metal ions. The
model is exactly solved using a valence bond approach. The ground state
solution of the model is highly degenerate and is spanned by five S=0 states,
nine S=1 states, five S=2 states and one S=3 state. The orbital occupancies in
all these states correspond to six ions and one diamagnetic
ion. The optically excited charge-transfer (CT) state in each spin sector occur
at nearly the same excitation energy of 2.993 eV for the physically reasonable
parameter values. The degeneracy of the CT states is largest in the S=3 sector
and so is the transition dipole moment from the ground state to these excited
states. Thus laser irradiation with light of this energy results in most
intense absorption in the S=3 sector. The life-time of the S=3 excited states
is also expected to be the largest as the number of states below that energy is
very sparse in this spin sector when compared to other spin sectors. These twin
features of our model explain the observed photomagnetism in the
complex.Comment: 8 pages, 6 figures and 1 tabl
Flavor Mixing in the Gauge-Higgs Unification
Gauge-Higgs unification is the fascinating scenario solving the hierarchy
problem without supersymmetry. In this scenario, the Standard Model (SM) Higgs
doublet is identified with extra component of the gauge field in higher
dimensions and its mass becomes finite and stable under quantum corrections due
to the higher dimensional gauge symmetry. On the other hand, Yukawa coupling is
provided by the gauge coupling, which seems to mean that the flavor mixing and
CP violation do not arise at it stands. In this talk, we discuss that the
flavor mixing is originated from simultaneously non-diagonalizable bulk and
brane mass matrices. Then, this mechanism is applied to various flavor changing
neutral current (FCNC) processes via Kaluza-Klein (KK) gauge boson exchange at
tree level and constraints for compactification scale are obtained.Comment: 5 pages, prepared for the proceedings of the International Workshop
on Grand Unified Theories (GUT2012) held at Yukawa Institute for Theoretical
Physics, March 15-17 2012, Kyoto, Japa
Combined immunosuppressive therapy with low dose FK506 and antimetabolites in rat allogeneic heart transplantation
Following rat heterotopic heart allotransplantation, low to lethal doses of the antimetabolites mizoribine (MIZ), RS-61443 (RS), and AZA were given alone or in combination with subtherapeutic doses of FK506 (0.04 mg/kg/day) for 14 days after transplantation. With the median effect analysis of Chou and Kahan for quantitative drug interactions, substantial therapeutic synergism was demonstrated between FK506 and nontoxic doses of MĪZ (2.5, 5, and 10 mg/kg/day) or AZA (5, 30, and 45 mg/kg/day), which was particularly evident with the lowest dose MIZ (2.5 mg/kg/day). When FK506 was used in combination with MIZ or AZA but not with RS, the maximum effect (peak median graft survival) was enhanced significantly from 15 days (MIZ alone) to 26 days (P<0.05), and from 19 days (AZA alone) to 32 days (P<0.0l). In contrast, RS interacted with FK506 no more than additively. Although RS was the most powerful single antimetabolite, the best overall survival was obtained by combining AZA and FK506. The addition of FK506 did not significantly increase the percent mortality and LD50 of the antimetabolites. © 1994 by Williams and Wilkins
Homeless Education: Analyzing the Problematic Legal Remedies Available to Homeless School Children
Given the extent to which our society values education, it is perplexing to learn that we continue to struggle to provide all children, especially homeless children, an adequate education. This troubling issue is the focus of this paper. Specifically, this paper will center around two basic questions; 1) what has the legal system done to ensure that homeless children receive an adequate education, and 2) what might be done, legally, to advocate for the educational well-being of such children? In addressing these two questions, this paper will begin by problematizing the definition of homelessness and by analyzing some national statistics on homelessness and homeless education. It will go on to discuss a few barriers to resolving the problem of homeless education. Then, it will examine two potential remedies to this problem. The first is the McKinney-Vento Homeless Assistance Act. The second is an alternative schooling arrangement that is uniquely designed to address the educational needs of homeless students. Ultimately, I hope to show that homeless children and families face a number of debilitating barriers to receiving an adequate education and that while the available remedies to these barriers (legal and non-legal) have offered some relief, they are not without problems
Bone marrow augmentation for heart, liver, and small bowel transplantation: Prolongation of graft survival and incidence of graft- versus-host disease
Small bowel transplantation in sensitized recipients: Comparison with heart, kidney, and liver grafts
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