659 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
Miscellaneous Literary Texts of Byzantium in Translation (3): Excerpt from Theodorus Metochites’ Semeioseis gnomikai
Miscellaneous Literary Texts of Byzantium in Translation (5): A Theory of State etc. by Manuel Moschopoulos
Miscellaneous Literary Texts of Ancient Greece and Byzantium in Translation: Alcidamas, On Those Who Write Written Speeches or On Sophists
Miscellaneous Literary Texts of Byzantium in Translation : Michael Psellus, For his Grandson, Still Infant
First records of two invasive species of thrips (Insecta: Thysanoptera) from Kyoto and Wakayama Prefectures
Two invasive species of thrips were recorded from Kyoto and Wakayama Prefectures. Adults and larvae of Haplothrips nigricornis were collected on flower heads of Tagetes patula at the University Farm, Kyoto Prefectural University in Shimogamo, Kyoto City and on those of Senecio madagascariensis in Gobo City, Wakayama Prefecture. Some adults of Tenothrips frici were captured on flower heads of Hypochaeris radicata on roadsides in Minamiyamashiro-mura, Kyoto, and in Wakayama City, Wakayama. We noted T. frici found in Sapporo City, Hokkaido, as the most northern locality in Japan
Comparative study on neural oscillation in the procerebrum of the terrestrial slugs Incilaria bilineata and
Coherent oscillatory activities in procerebral neurones have been described in Limax maximus; however, the electrical properties of the procerebrum of other terrestrial molluscs are less well understood. We have examined oscillatory activity in the procerebrum of Incilaria bilineata and Limax marginatus. The local field potential measured in the procerebrum of I. bilineata showed repetitive peaks which had the opposite polarity from those measured in L. marginatus. Optical measurement of membrane potential using a potential-sensitive dye, di-4-ANEPPS, showed that the oscillations in I. bilineata occurred mainly in the internal mass while those in L. marginatus were located in the cell mass. An analysis of the waveform revealed that the depolarizing phase of the oscillations consists of both a slow and a rapid component in both species. The rapid component was most pronounced in the internal mass of I. bilineata but was prominent in the cell mass of L. marginatus. The superior tentacle nerve, which projects to the terminal mass, also showed oscillations in synchrony with those of the procerebrum. These results suggest that oscillations in procerebral interneurones are commonly generated in a region adjacent to the terminal mass and that these oscillations may affect the membrane potential of the neurones constituting the superior tentacle nerve
Superconducting zinc heat switch for continuous nuclear demagnetization refrigerator and sub-mK experiments
We have developed and tested a zinc superconducting heat switch suitable for
magnetic refrigeration and calorimetric experiments at sub-millikevin (sub-mK)
temperatures. The specific application here is an adiabatic demagnetization
refrigerator with two PrNi nuclear stages, which can keep a temperature
of 0.8 mK continuously, (CNDR) proposed by Toda et al. (J. Phys.: Conf. Ser.
969, 012093 (2018). The switch consists of six high-purity zinc foils of 0.25
mm thick which contact seven silver foils by diffusive bonding. The silver
foils are electron beam welded to silver rods that are thermal links to other
components. The choice of the thin zinc foils is due to reduce the magnetic
latent heat on switching and the contact thermal resistance under a constraint
on the aspect ratio of the switch element. The measured thermal conductance of
the whole switch assembly in the normal (closed) state, ,
agrees very well down to 70 mK with the value estimated from the residual
electrical resistance 114 n at 4.2 K, indicating the validity
of the Wiedemann-Franz law for zinc. The measured thermal conductance in the
superconducting (open) state, , follows nicely the prediction
from the BCS theory and approaches the value expected from the Debye model for
thermal phonons near 70 mK. The heat leak through the HSW from the higher
temperature side of 30 mK at most is estimated to be less than 0.5 nW, which is
much lower than the expected cooling power ( nW) of the CNDR at 0.8 mK .
The switching ratio extrapolated to 30 mK,
is as high as 5. All the test results meet the requirements for the
CNDR and, for example, heat capacity measurements at sub-mK.Comment: 15 pages, 5 figure
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