291 research outputs found
Carrier Relaxation Dynamics in the Organic Superconductor kappa-(BEDT-TTF)(2)Cu(NCS)(2) Under Pressure
Photo-induced carrier relaxation dynamics have been investigated for the organic superconductor kappa-(BEDT-TTF)(2)Cu(NCS)(2) with different probe polarization under 1.3 kbar at low temperatures. We successfully observed the isotropic and anisotropic responses for the probe polarization, which were found to appear at 56 K. By comparing the responses with and without applying pressure, we found that those were slightly changed, indicating that the application of pressure has effect on the carrier relaxation dynamics
Low temperature heat capacity of severely deformed metallic glass
The low temperature heat capacity of amorphous materials reveals a
low-frequency enhancement (boson peak) of the vibrational density of states, as
compared with the Debye law. By measuring the low-temperature heat capacity of
a Zr-based bulk metallic glass relative to a crystalline reference state, we
show that the heat capacity of the glass is strongly enhanced after severe
plastic deformation by high-pressure torsion, while subsequent thermal
annealing at elevated temperatures leads to a significant reduction. The
detailed analysis of corresponding molecular dynamics simulations of an
amorphous Zr-Cu glass shows that the change in heat capacity is primarily due
to enhanced low-frequency modes within the shear band region.Comment: 5 pages, 2 figure
Spontaneous Erythroid Leukemia in a 7-Week-Old Crl:CD (SD) Rat
A young male Crl:CD (SD) rat with erythroid leukemia that presented with
emaciation, abdominal distension and a pale visible mucosal membrane was
euthanized at 7 weeks of age. At necropsy, enlargement of liver, spleen and
pancreatic lymph node was noted. Analysis of blood smear samples revealed many
mono- or binucleated erythroblasts that had PAS-positive vacuoles in the
cytoplasm. Histopathologically, neoplastic proliferation of atypical cells was
observed in the hepatic sinusoids, splenic red pulp, bone marrow, pancreatic
lymph node, kidney and lung. Neoplastic cells showed a round to spindle shape,
and some neoplastic cells had deeply stained small nuclei and small cytoplasms
and resembled erythroblasts. Immunohistochemically, many neoplastic cells were
positive for hemoglobin. To our knowledge, this is the first report of erythroid
leukemia in a rat of this age. The observed features were similar to those of
pure erythroid leukemia in humans
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