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排序方式: 共有80条查询结果,搜索用时 15 毫秒
21.
N. Gunasekara T. Takahashi F. Maeda T. Sagawa H. Suematsu 《Zeitschrift für Physik B Condensed Matter》1988,70(3):349-355
The electronic band structure of the first stage alkali-metal graphite intercalation compounds (C8K, C8Rb and C8Cs) was determined by angle-resolved ultraviolet photoelectron spectroscopy. The dispersive feature of the * bands at
point in the Brillouin zone was clearly observed in all the compounds. The electron occupancies in the * band of C8K, C8Rb and C8Cs were estimated to be 0.5±0.05 e (e; unit electronic charge), 0.45±0.05 e and 0.4±0.05 e, respectively. This strongly suggests that another half of the unit electronic charge is accommodated in the three-dimensional band at point, which forms a spherical Fermi surface at the center of the Brillouin zone. The character of the three-dimensional band at point was also discussed.He died on 27th of September, 1986 相似文献
22.
23.
The enumeration theory is extended in this work into a more general theory, taking back-reactions into consideration. The solutions may faithfully reproduce real processes from arbitrary starting points to a steady-state. Therefore, the presented theory includes the equilibrium theory by Jacobson-Stockmayer, the numerical solution by Gordon-Temple, and the irreversible theory by the present authors. The solutions are described first in general forms of transition probabilities {P}, and then explicitly with the aid of rate equations; simple proofs are given. The presented theory was applied to an experimental data: the distribution of cyclic species in poly(ethylene terephthalate). We shall show that agreement between theory and experiment is nearly perfect.AB model
N
0
Total number of units
-
V
System volume
-
C
0=N
0/N
A
·V
Initial concentration (N
A
: Avogadro's number)
-
L
x
AB type chain x-mer; (AB)x
-
N
x
Number of AB type x-mers
-
R
x
Ring x-mer
-
N
Rx
Number of ring x-mers
-
E
Small molecule eliminated by bond-formation
-
N
E
Number of small molecules eliminated by bond-formation
-
h
k
Number of reacted functional units (f.u.) in statek
-
k
Number of reacted functional units (f.u.) in chains in statek
-
k
Total number of units in chains in statek
-
D=h
k
/N
0
Extent of reaction in statek
-
D
*=
k
/
k
Extent of reaction in chains in statek
-
k
L
Chain-propagation rate constant
-
k
Rx
Cyclization rate constant of chain x-mers
-
k
B
Bond breakage rate constant of chains
-
k
B,Rx
Bond breakage rate constant of cyclic x-mers
- <k
Rx
>
k
Mean cyclization rate constant in statek
-
g(x)=k
B,Rx
/k
B
Ring-opening factor of cyclic x-mers
-
P
Lx,k
Probability that a chain x-mer will be formed in statek
- {P}
Set of transition probabilities per single jump in forward direction or reverse direction (see the text on individual transition probabilities)
AB model
M
A
Total AA monomer unit number
-
M
B
Total BB monomer unit number
-
M
0=M
A
+M
B
Total particle number
-
A,i
=2M
A
–h
i
Unreacted A functional unit (f.u.) number in statei
-
B,i
=2M
B
–h
i
Unreacted B f.u. number in statei
-
Ax
Unreacted A f.u. number on x-mers
-
h
i
Number of reacted A (or B) f.u. in statei
-
i
Number of reacted A (or B) f.u. in chains in statei
-
A,i
=2M
A
–h
i
+
i
A f.u. number in chains in statei
-
B,i
=2M
B
–h
i
+
i
B f.u. number in chains in statei
-
i
=2(M
0–h
i
+
i
)
Total f.u. number in chains in statei
-
D=h
i
/M
0
Extent of reaction in statei
-
D
A
*
=
i
/
A,i
Extent of reaction of A f.u. in chains in statei
-
D
B
*
=
i
/
B,i
Extent of reaction of B f.u. in chains in statei
-
D
*=2
i
/
i
Extent of reaction in chains in statei
-
L
x
(AA-BB)x-1-AA type chain x-mer;x=1,2,3,...
-
L
x
BB-(AA-BB)x type chain x-mer;x=0,1,2,...
-
L
x
(AA-BB)x type chain x-mer;x=1,2,3,...
-
N
x
Number of type x-mers
-
N
x
Number of type x-mers
-
N
x
Number of type x-mers 相似文献
24.
Periodic Oscillatory Motion of a Self-Propelled Motor Driven by Decomposition of H2O2 by Catalase
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Prof. Satoshi Nakata Mio Nomura Hiroya Yamamoto Prof. Shunsuke Izumi Prof. Nobuhiko J. Suematsu Prof. Yumihiko Ikura Prof. Takashi Amemiya 《Angewandte Chemie (International ed. in English)》2017,56(3):861-864
A self-propelled motor driven by the enzymatic reaction of catalase adsorbed onto a filter paper floating on an aqueous solution of H2O2 was used to study nonlinear behavior in the motor's motion. An increase in the concentration of H2O2 resulted in a change from no motion to irregular oscillatory motion, periodic oscillatory motion, and continuous motion. The mechanisms underlying oscillation and mode bifurcation are discussed based on experimental results on O2 bubble formation and growth on the underside of the motor. 相似文献
25.
M. Karppinen H. Yamauchi H. Suematsu K. Isawa M. Nagano R. Itti O. Fukunaga 《Journal of solid state chemistry》1997,130(2):213-222
The LaCuO3−yperovskite is considered as the first member of the 01(n−1)nseries of “layered cuprates.” Highly oxidized, stoichiometric LaCuO3is stabilized under very high oxygen pressures, and was synthesized in a cubic-anvil-type high-pressure apparatus at 5 GPa and 1400°C using excess amounts of KClO4as an external oxidizing agent. Upon heating under ambient pressure the rhombohedral high-pressure phase loses oxygen yielding tetragonal, monoclinic, and orthorhombic forms of LaCuO3−yas intermediate products before the final decomposition into La2CuO4and CuO or Cu2O around 800°C. All three oxygen-deficient LaCuO3−yphases could be isolated and their stability limits and corresponding oxygen contents conveniently investigated by annealing stoichiometric LaCuO3in a thermobalance of high sensitivity in order toin situdetect the exact amount of oxygen loss. The nominal copper valence values calculated from the oxygen contents are compared and discussed with XPS data as well as with the results evaluated from magnetic susceptibility measurements. 相似文献
26.
Yoshichika Ōnuki Hiroyoshi Suematsu Sei-Ichi Tanuma 《Journal of Physics and Chemistry of Solids》1977,38(4):419-429
The cyclotron resonances in lead in field tipped geometry have been observed for large tipping angles up to 40° from the sample surfaces of the (111) and (100) planes. In addition to the resonance of the orbit ζ on a cylindrical arm of the electron Fermi surface, two new series of resonances, ζA and ζB have been found, of which the clotron masses are very close to that of ζ but which differ slightly in tipping angle dependence. The mass of ζA is dependent on microwave frequency, so that ζA is attributed to the Doppler-shifted cyclotron resonance of a non-stationary orbit near, ζ, whose location is discussed in relation to the Fermi surface model of Van Dyke. In field geometry normal to the (100) surface, two series of resonances have been observed, which are characterized as the extinction of even numbered harmonic resonances. This effect arises from the skipping orbit which has a trajectory topologically similar to a baseball seam in real space. One of these series is attributed to the orbit v around the junction of four electron arms. 相似文献
27.
28.
Kazumi Suematsu 《Colloid and polymer science》2012,290(6):481-490
The concentration dependence of the excluded volume effects in polymer solutions is investigated. Through thermodynamic arguments
for the interpenetration of polymer segments and the free energy change, we show that the disappearance of the excluded volume
effects should occur at medium concentration. The result is in accord with the recent experimental observations. 相似文献
29.
D. Suematsu 《Zeitschrift fur Physik C Particles and Fields》1990,48(1):151-157
We show that under a certain assumption systems with second-class constraints can be regarded as gauge-fixed systems with first-class constraints. The massive Yang-Mills theory, a point particle on a sphere and theO(N) symmetric non-linear σ-model are considered as concrete examples. 相似文献
30.
Suematsu NJ Nishimura S Yamaguchi T 《Langmuir : the ACS journal of surfaces and colloids》2008,24(7):2960-2962
We studied the release and transfer of polystyrene (PS) microdots on mica. The PS dots were released from the mica in water. The release was affected by the density of K(+) ions on the mica surface, which was controlled by pretreatment with K(2)CO(3) solutions. The release of PS dots became dominant at the concentrations above [K(+)]crit = 1 x 10(-4) M in the K(2)CO(3) solution. In this concentration region, repulsive forces appeared as a result of the hydration of K(+) ions on the mica (J. Colloid Interface Sci. 1981, 83, 531). This result suggests that the repulsive hydration force causes the release of the PS dots. Followed by the release process, we successfully demonstrated the transfer of the array of PS dots from the mica to another substrate. 相似文献