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ABSTRACT: High-temperature vibrational densitometer for chemically active media was developed. The principle of operation of the densitometer
is based on recording and analyzing the natural frequency of a U-shaped high-pressure capillary filled with the test medium.
The placement of the capillary in a thermostat capable of maintaining its temperature to within ±0.1°C makes it possible to
measure the density and study the phase behavior of aggressive media over pressure and temperature ranges of 0.1–50 MPa and
20–500°C, respectively. Measurements of the carbon dioxide density with the densitometer developed at temperature below, near,
and above its critical point (31°C), as well as water density measurements at temperatures up to 375°C demonstrated good agreement
with the data from the NIST (National Institute of Standards and Technology) interactive database. The density of a methanol-water
mixture was measured at temperatures up to 300°C.
Key wordssupercritical fluids–density measurements–high-temperature media at high pressure–phase behavior
Russian Journal of Physical Chemistry B 04/2012; 3(7):1125-1130. · 0.26 Impact Factor
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ABSTRACT: We have investigated the temperature and bias-voltage dependences in the tunneling magnetoresistance (TMR) curves for (Ga,Mn)As-based double-barrier magnetic tunnel junctions (DB MTJs). The coercive fields in each magnetic (Ga,Mn)As layer drastically decrease depending on the variations in the temperature. TMR ratios decrease monotonically with increasing temperature. Furthermore, we have demonstrated that DB-MTJs not only enhance the TMR ratio effectively but also improve the strong bias-voltage characteristics.
Journal of Applied Physics 02/2008; 103(7):07A908-07A908-3. · 2.17 Impact Factor
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ABSTRACT: A variety of metallic powder particles were thermally sprayed onto the mirror polished metallic substrate surface and the
effect of both substrate temperature and ambient pressure on the flattening behavior of the particle was systematically investigated.
In the flattening behavior of the sprayed particle onto the substrate surface, critical conditions were recognized both in
the substrate temperature and ambient pressure. That is, the flattening behavior changed transitionally on that critical temperature
and pressure range, respectively. A transition temperature, T
t, and transition pressure, P
t, were defined and introduced, respectively for those critical conditions. The fact that the dependence of both transition
temperature and transition pressure on the sprayed particle material had similar tendency indicated that the wetting of the
substrate by the molten particles seemed to be a domination in the flattening. Three-dimensional transition curvature by combining
both transition temperature and transition pressure dependence was proposed as a practical and effective controlling principle
of the thermal spray process.
Journal of Thermal Spray Technology 11/2007; 16(5):905-912. · 1.81 Impact Factor
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ABSTRACT: We have investigated the current pulse width dependence on current-driven magnetization reversal in double-barrier structures
using GaMnAs-based magnetic tunneling junctions (MTJ) in order to clarify the origin of low threshold current density for
current-driven magnetization reversal. Comparing with the case of single-barrier MTJ, the pulse-width dependence reveals that
threshold current density is reduced by double-barrier MTJ. We confirmed that the threshold current density in the order of
104A/cm2 is estimated considering the effect of current pulse width.
Journal of Superconductivity and Novel Magnetism 07/2007; 20(6):443-446. · 0.65 Impact Factor
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ABSTRACT: A 1.85 M Ga(ClO4)3-4.1 M HClO4 aqueous solution was studied by the XRD method at 273, 298, and 333 K. It was established that, over the temperature range
covered, the Ga3+ cation in the solution under study coordinates six water molecules located at a distance of 0.195 ± 0.002 nm and forms a
second coordination sphere at a distance of 0.401 ± 0.003 nm. It was demonstrated that solvent-separated ion pairs are formed
and that their concentration increases irrespective of whether the temperature is increased or decreased from 298 K.
Russian Journal of Physical Chemistry 12/2005; 80(1):84-89. · 0.46 Impact Factor
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ABSTRACT: Hot-rolling workability, texture and grain boundary character distribution of B2-type FeAl, NiAl and CoTi intermetallic compounds were investigated as a function of alloy stoichiometry. All the FeAl (i.e., Fe-38Al, -43Al and -48Al, denoted by at.%), and stoichiometric NiAl and CoTi were successfully hot-rolled at 1273 K but off-stoichiometric NiAl (Ni-48Al and -52Al) and CoTi (Co-48Ti and -49Ti) failed. After hot-rolling, all the FeAl showed microstructures with recrystallized coarse grains while (stoichiometric) CoTi retained a deformed microstructure. Hot-rolled (stoichiometric) NiAl showed an intermediate microstructure between FeAl and CoTi. The hot-rolling and annealing textures of FeAl essentially consisted of {111}u v w. For NiAl and CoTi, {111}110 and {111}112 were prominent in the hot-rolling texture, respectively. Both the hot-rolled NiAl and CoTi showed fully-recrystallized microstructures by subsequent annealing, but the resultant recrystallization textures were similar to their hot-rolling textures. On the other hand, grain boundary character distributions of FeAl, NiAl and CoTi with fully-recrystallized microstructures were similar to one another and characterized by a high frequency of low angle boundaries (i.e. 1 boundaries). Based on these results, recrystallization and grain boundary structure of the B2-type ordered intermetallic compounds were briefly discussed.
Journal of Materials Science 01/2005; 40(3):733-740. · 2.02 Impact Factor
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ABSTRACT: A small single bubble was generated with a single-hole nozzle facing upward in a water bath contained in a rotating cylindrical
vessel. The bubble size falls in the surface tension force dominant regime. The vertical, radial, and tangential migration
velocities of the bubble were measured with two CCD cameras and a high-speed video camera. The tangential velocity component
of water flow was measured with particle image velocimetry. A helical motion of the bubble was observed under every experimental
condition. The direction of the helical motion was the same as that of the tangential velocity component. This helical motion
is associated with the large initial shape deformation of the bubble near the nozzle exit and the subsequent regular shedding
of vortices behind it. The period and amplitude of the helical motion were obtained by analyzing the trajectory of the bubble.
These quantities were non-dimensionalized by the volume equivalent bubble diameter and the terminal bubble velocity in the
vertical direction and correlated as functions of the Eotvos number. Empirical equations were proposed for the period and
amplitude.
Experimental Mechanics 09/2004; 44(5):533-540. · 1.52 Impact Factor
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ABSTRACT: This paper describes a method for the separation, by high-performance thin-layer chromatography (HPTLC), of a series of polar,
ionic, and hydrophilic double conjugates of bile acids amidated at the C-24 carboxyl group with glycine or taurine and sulfonated
or glucosylated at hydroxyl groups in the 5β-steroid nucleus. The method involves two-dimensional (2D) reversed-phase (RP)
HPTLC with the combined use of tetra-n-butylammonium phosphate (TBAP) and methyl β-cyclodextrin (Me-β-CD) as mobile phase additives. Complete separation of the
hydrophilic bile acid conjugates, particularly of the recalcitrant pairs of chenodeoxycholic acid and deoxycholic acid conjugates
in each group, was achieved by 2D inclusion RPHPTLC by developing with methanol-water-0.5 mol L−1 TBAP, 90:10:5–75:25:5 (ν/ν) in the first dimension and the same mobile phase containing 5mm Me-β-CD in the second dimension. The method could be usefully applied to biosynthetic and metabolic studies of bile acids
in biological materials.
Chromatographia 05/1999; 49(11):681-685. · 1.20 Impact Factor
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ABSTRACT: Fifteen local spiking interneurons (LSIs) and twentyone local non-spiking interneurons (LNIs) were identified in the terminal abdominal ganglion (TAG) of the cricket Gryllus bimaculatus on the basis of intracellular recording and staining (Figs. 1, 5, 6). Although the majority of LNIs showed sharp directionalities (Fig. 7) the LSIs did not (Fig. 3). The directionality of LNIs varied with the recording sites within a single cell (Fig. 8). Electrical stimulations of the cereal sensory nerve suggested that the LNIs are connected monosynaptically with the sensory afferents of both the cerci, and that LSIs may possess a variety of bilateral combinations of polysynaptic connections with the sensory afferents. We found that the spiking and the non-spiking local interneurons in the cereal sensory system differ not only in their membrane properties, but also in their afferent connections, and concluded that their differing connectivity to the sensory afferents will associate them with different roles in signal processing.
Journal of Comparative Physiology 12/1994; 176(1):17-30. · 2.01 Impact Factor
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K. Takahashi,
N. Yamamoto,
H. Egawa,
T. Takeuchi, T. Yamaguchi,
Y. Takada,
F. Nishizawa,
T. Takayasu,
M. Narita,
K. Mori,
Y. Yamaoka,
K. Ozawa
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ABSTRACT: This study investigated whether prostaglandin E1 (PGE1) could reduce hepatic injury to the liver graft caused by harvesting and 24-h preservation in University of Wisconsin (UW) solution in a canine model. The PGE1-treated group was intravenously administered 0.5 g/kg per minute of PGE1 for 30 min before harvesting, as well as a concentration of 1 mg/l PGE1 in the washout and UW solutions. In both the PGE1-treated and the control group, all recipients survived for 1 week or more after transplantation. Arterial ketone body ratio (AKBR) remained over 1.0 in the early postoperative period. The PGE1 group showed significant reductions in guanase, GOT, and LDH during the early postoperative period compared to the untreated control group. Histological examination disclosed partial mitochondrial swelling, hepatocyte vacuolation, and necrosis in the control group, while such abnormalities were rarely seen in the PGE1 group. These results suggest that PGE1 can effectively reduce hepatic injury to liver grafts preserved in UW solution prior to transplantation.
Transplant International 01/1993; 6(5):245-250. · 2.92 Impact Factor
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ABSTRACT: In anesthetized cats single motor units (MUs) of the extensor carpi ulnaris (ECU) and extensor digitorum communis (EDC) muscles were selectively activated by stimulation of cervical ventral root filaments. The distribution of force developed by single MUs at the four distal tendons of the EDC muscle and at three portions of the distal tendon of the ECU muscle was analysed. In general, single MUs of both muscles distributed force over all tendons in a unimodal pattern, with the maximal force levels generated at one specific tendon which was termed the best-tendon. Distributions of force were quantitatively described by a parameter representing the mean direction of force output (output-index) and a further one representing the dispersion of force over the distal tendons (divergence). Generally, these parameters and the best-tendon remained stable when a MU was stimulated at different frequencies, but varied from MU to MU. Despite the general stability of the force distribution, slight systematic changes were regularly found in EDC MUs, when they developed a higher amount of force due to a higher frequency of stimulation: the relative amount of force at the best-tendon increased; e.g. the MUs got more selective for the best-tendon. These changes were partly due to overcoming mechanical cross-coupling between neighbouring compartments of the EDC muscle. Such changes of force distribution were only found in a part of the ECU MUs; other ECU MUs did not change their force distribution at all or became less selective for the best-tendon. The phenomenon that MUs of multi-tendoned muscles distribute their force output to the distal tendons in specific patterns is probably due to mechanical partitioning of the parent muscles: the localization of spatial territories of MUs within different anatomical muscle compartments should correspond to the best-tendon. Complex mechanisms allowing passive transmission of force from limited territories along the transverse axis of both muscles must be assumed in order to explain why most MUs act on all tendons and why force distributions change with increasing stimulus frequency. In addition, specific relations between unit type and force distributions were found within both muscles. Fatigue-resistant EDC MUs have broader force distributions than fatigue-sensitive EDC MUs and slow ECU MUs were found to act predominantly on the most ulnar part of the distal tendon. These biomechanical properties of MUs are discussed as supporting the specific functions of the respective muscles.
Experimental Brain Research 02/1992; 88(2):411-21. · 2.39 Impact Factor
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[show abstract]
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ABSTRACT: In anesthetized cats single motor units (MUs) of the extensor carpi ulnaris (ECU) and extensor digitorum communis (EDC) muscles were selectively activated by stimulation of cervical ventral root filaments. The distribution of force developed by single MUs at the four distal tendons of the EDC muscle and at three portions of the distal tendon of the ECU muscle was analysed. In general, single MUs of both muscles distributed force over all tendons in a unimodal pattern, with the maximal force levels generated at one specific tendon which was termed the best-tendon. Distributions of force were quantitatively described by a parameter representing the mean direction of force output (output-index) and a further one representing the dispersion of force over the distal tendons (divergence). Generally, these parameters and the best-tendon remained stable when a MU was stimulated at different frequencies, but varied from MU to MU. Despite the general stability of the force distribution, slight systematic changes were regularly found in EDC MUs, when they developed a higher amount of force due to a higher frequency of stimulation: the relative amount of force at the best-tendon increased; e.g. the MUs got more selective for the best-tendon. These changes were partly due to overcoming mechanical cross-coupling between neighbouring compartments of the EDC muscle. Such changes of force distribution were only found in a part of the ECU MUs; other ECU MUs did not change their force distribution at all or became less selective for the best-tendon. The phenomenon that MUs of multi-tendoned muscles distribute their force output to the distal tendons in specific patterns is probably due to mechanical partitioning of the parent muscles: the localization of spatial territories of MUs within different anatomical muscle compartments should correspond to the best-tendon. Complex mechanisms allowing passive transmission of force from limited territories along the transverse axis of both muscles must be assumed in order to explain why most MUs act on all tendons and why force distributions change with increasing stimulus frequency. In addition, specific relations between unit type and force distributions were found within both muscles. Fatigue-resistant EDC MUs have broader force distributions than fatigue-sensitive EDC MUs and slow ECU MUs were found to act predominantly on the most ulnar part of the distal tendon. These biomechanical properties of MUs are discussed as supporting the specific functions of the respective muscles.
Experimental Brain Research 01/1992; 88(2):411-421. · 2.39 Impact Factor
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ABSTRACT: Investigation of genomic polymorphisms detected by a minisatellite named tentatively Myo, which is expected to correspond to the minisatellite in human myoglobin gene of Jeffreys et al., gives distinct and different aspects of chorionic villus and the decidual membrane in the same placenta. The chorionic villus, which is regarded as the extraembryonal tissue, represents the essential embryonal DNA fingerprint pattern, while the decidual membrane reveals the maternal one. A comparison between the DNA fingerprints from the chorion villus and from the blood sample of the suspected father provides the possibility of setting a paternity determination which can be achieved during the first trimester of a pregnancy.Die genomischen Eigenschaften der Plazenta wurden mit Hilfe von einer Sonde Myo gegenber dem Minisatellit, der im Bereich vom humanen Myoglobinen vorhanden ist, analysiert. Der DNS Fingerabdruck von Chorionzotten stimmt vllig mit dem des Ftus berein, whrend der Fingerabdruck der Dezidua die mtterliche Herkunft darstellt. Die Analyse von verschiedenen DNS Fingerabdrcken aus Ftus, Chorionzotten, Mutter und Vater bei einer knstlichen Schwangerschaftsunterbrechung hat gezeigt, da der DNS Fingerabdruck von Chorionzotten, die gewhnlich bei der klinischen Chorionzottenbiopsie entnommen werden knnen, die entscheidende Auskunft darber gibt, das Bestehen der Vaterschaft vollstndig zu beweisen.
Deutsche Zeitschrift für die Gesamte Gerichtliche Medizin 01/1988; 99(4):241-248. · 2.59 Impact Factor
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ABSTRACT: A correlation between lithium and psoriasis has been observed. In this paper, the case of a 17-yr-old girl is reported who
developed psoriatic lesions after administration of lithium carbonate. Further-more, serum lithium levels in some psoriatic
patients are disclosed, and induction of psoriasis by lithium in experimental animals is described. Serum lithium levels in
27 patients were significantly higher (p<0.025) than those of controls. Uninvolved parts of skin tissues obtained from three cases of psoriasis were transplanted
to nude mice. After supplementing lithium as the chloride, these skin grafts developed the histologic change characteristic
of psoriasis. However, the lithium compound by itself did not increase superoxide production of polymorphonuclear leukocytes
in psoriasis.
Biological Trace Element Research 04/1987; 14(3):169-177. · 1.92 Impact Factor
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ABSTRACT: Microcrystalline and amorphous hydrogenated silicon films were preparaed by rf planar magnetron sputtering in the four kinds of inert gas, i.e., He, Ne, Ar, and Kr. The dependence of such properties as x-ray diffraction, ir spectra, absorption coefficient, hydrogen content, dark conductivity and photoconductivity on the kind of inert gas was investigated. Such deposition conditions as hydrogen partial pressure, sputtering pressure and rf power were also studied mainly in relation to the microcrystallization of the films. Microcrystalline films with noticeably high deposition rate could be obtained in the case of Kr and Ar, compared to the case of He and Ne. Hydrogen concentration was found to correlate to the photoconductivity and activation energy of dark conductivity except for the case of He. Photosensitivity was appreciably larger for amorphous film than for microcrystalline one. Especially in the case of Kr, it was considerably larger than in other cases.
Applied Physics A 11/1984; 35(4):241-247. · 1.63 Impact Factor
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Naturwissenschaften 01/1984; 71(3):154-156. · 2.28 Impact Factor
