Autor: Nakamura, T. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Precise measurement of complex permittivity of materials for telecommunications devices
Autorzy:: Nakamura, T.
Nikawa, Y.
Powiązania:: https://bibliotekanauki.pl/articles/309568.pdf
Data publikacji:: 2001
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: perturbation method
TLM method
cavity resonator
simulation model
temperature dependence of complex permittivity
microwave measurement
Opis:: In order to obtain precise complex permittivity of the dielectric materials obtained from the perturbation method a correction curve is made using the electromagnetic field simulator which applies transmission line modeling (TLM) method. In this experiment, generated microwave power with the frequency of 2.45 GHz is applied to heat dielectric material while measuring temperature dependence of complex permittivity of dielectric material. To obtain these objectives cavity resonator with cooling system is designed. It is found from the result that the accurate temperature dependence of complex permittivity of the materials can be obtained by the method presented here.
Źródło:: Journal of Telecommunications and Information Technology; 2001, 3; 66-71
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effect of robot utterances using onomatopoeia on collaborative learning
Autorzy:: Jimenez, F.
Kanoh, M.
Yoshikawa, T.
Furuhashi, T.
Nakamura, T.
Powiązania:: https://bibliotekanauki.pl/articles/91733.pdf
Data publikacji:: 2014
Wydawca:: Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:: robot
onomatopoeia
collaborative learning
Opis:: We investigated the effect of robot’s utterances using onomatopoeia in collaborative learning. The robot was designed to provide encouragement using onomatopoeia when students are given problems to be solved issued by a learning system. Eight college students used a mathematics learning system with a robot for three weeks and then took exams. The results indicated that the robot using utterances with onomatopoeia could comfort learners more than the robot without onomatopoeia. It suggests that the robot that praises or comforts using onomatopoeia helps learners maintain their motivation in collaborative learning.
Źródło:: Journal of Artificial Intelligence and Soft Computing Research; 2014, 4, 2; 125-131
2083-2567
2449-6499
Pojawia się w:: Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Micro-Raman Study of $BiFeO_3$ Thin Films Fabricated by Chemical Solution Deposition Using Different Bi/Fe Ratio Precursors
Autorzy:: Nakamura, T.
Fukumura, H.
Hasuike, N.
Harima, H.
Nakamura, Y.
Kisoda, K.
Nakashima, S.
Okuyama, M.
Powiązania:: https://bibliotekanauki.pl/articles/1807821.pdf
Data publikacji:: 2009-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.30.Hv
63.20.D-
78.30.-j
Opis:: $BiFeO_3$ thin films were grown by chemical solution deposition using precursors with different elemental ratios, Bi/Fe = 1.1/1.0, 1.0/1.0 and 1.0/1.1. All the samples consisted of two easily distinguishable components of crystalline and amorphous phases. We have found that the electric properties of $BiFeO_3$ thin films are closely connected to the crystallinity of the films.
Źródło:: Acta Physica Polonica A; 2009, 116, 1; 72-74
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Synthesis and Characterization of Mn-Doped $BiFeO_3$ Nanoparticles
Autorzy:: Fukumura, H.
Matsui, S.
Tonari, N.
Nakamura, T.
Hasuike, N.
Nishio, K.
Isshiki, T.
Harima, H.
Kisoda, K
Powiązania:: https://bibliotekanauki.pl/articles/1807808.pdf
Data publikacji:: 2009-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.30.Hv
63.20.D-
78.30.-j
Opis:: $BiFeO_3$ is a multiferroic material showing antiferromagnetic ordering and ferroelectric behavior simultaneously. Here, Mn-doped $BiFeO_3$ nanoparticles were synthesized up to 10% of Mn composition by a sol-gel process. The samples showed high crystallinity with no secondary phase up to 2% of Mn doping. A phonon peak at 1250 $cm^{-1}$ in undoped $BiFeO_3$ showed anomalous intensity enhancement in the magnetically ordered phase below $T_N$ = 643 K due to a spin-phonon coupling. This behavior was less pronounced in the Mn-doped samples, suggesting a suppression of magnetic ordering between $Fe^{3+}$ spins by Mn doping.
Źródło:: Acta Physica Polonica A; 2009, 116, 1; 47-50
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Involvement of cyclooxygenase (COX)-2 products in acceleration of ulcer healing by gastrin and hepatocyte growth factor
Autorzy:: Brzozowski, T.
Konturek, P.C.
Konturek, S.J.
Pajdo, R.
Schuppan, D.
Drozdowicz, D.
Ptak, A.
Pawlik, M.
Nakamura, T.
Hahn, E.G.
Powiązania:: https://bibliotekanauki.pl/articles/69750.pdf
Data publikacji:: 2000
Wydawca:: Polskie Towarzystwo Fizjologiczne
Tematy:: gastric ulcer
gastric blood flow
prostaglandin
ulcer healing
hepatocyte
cyclooxygenase-2
cyclooxygenase-1
growth factor
gastrin
Źródło:: Journal of Physiology and Pharmacology; 2000, 51, 4,1
0867-5910
Pojawia się w:: Journal of Physiology and Pharmacology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Body weight of high and low aggression mice under various population densities
Autorzy:: Oikawa, T
Kawamoto, Y.
Nakamura, S.
Morimasa, T.
Sato, K.
Powiązania:: https://bibliotekanauki.pl/articles/2043138.pdf
Data publikacji:: 2000
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: population density
statistical analysis
mice
aggressive behaviour
sex
animal
growth
mouse
phenotypic mean
genotype
environment interaction
body weight
heterogeneity
aggression
Źródło:: Journal of Applied Genetics; 2000, 41, 1; 35-42
1234-1983
Pojawia się w:: Journal of Applied Genetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Effect of substrate temperature on the crystal properties of LiMn2O4 films prepared by RF magnetron sputtering
Autorzy:: Isai, M.
Nakamura, K.
Hosokawa, T.
Izumichi, T.
Sekikawa, S.
Powiązania:: https://bibliotekanauki.pl/articles/384289.pdf
Data publikacji:: 2009
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: LiMn2O4 thin film
RF magnetron sputtering
Li secondary batteries
Opis:: The LiMn2O4 films for Li secondary batteries have been prepared by a RF magnetron sputtering method. The LiMn2O4 powder was used as a target material. The deposition rate, XRD, and surface morphology were investigated as a function of substrate temperature (Tsub). It was found that the deposition rate had a peak at around the of 200 °C. This research was also designed for preventing the target material being oxidized during the reactive sputtering process. A quartz tube was inserted between shutter and target. It seems that the quartz tube is effective to prevent oxidation of target material.
Źródło:: Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 65-68
1897-8649
2080-2145
Pojawia się w:: Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Structural characterization of room-temperature synthesized fullerene nanowhiskers
Autorzy:: Miyazawa, K.
Minato, J.
Mashino, T.
Nakamura, S.
Fujino, M.
Suga, T.
Powiązania:: https://bibliotekanauki.pl/articles/146219.pdf
Data publikacji:: 2006
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: carbon
C60
fullerene
nanowhisker
structure
TEM
Opis:: Structural properties of various kinds of room-temperature synthesized C60 fullerene nanowhiskers were investigated by TEM and XRD. The C60 nanowhiskers prepared by use of toluene lost their initial solvated hexagonal structure faster than the C60 nanowhiskers prepared by use of m-xylene. The hexagonal structure of C60 nanowhiskers prepared by use of toluene was stabilized by adding C60[C(COOC2H5)2]. These results suggest that large solute molecules in the C60 nanowhisker matrix stabilize their initially solvated hexagonal structure. Furthermore, the addition of a sufficient amount of C60(2-methoxycarbonyl-N-methylpyrrolidine) into the m-xylene solution of C60 produced the C60 nanowhiskers indicating the formation of ordered solid solution of C60 and C60(2-methoxycarbonyl-N-methylpyrrolidine).
Źródło:: Nukleonika; 2006, 51,suppl.1; 41-48
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: HRTEM observation of the precipitates in Cu and Ag added Al-Mg-Si alloys
Obserwacja wydzieleń w stopach Al-Mg-Si z dodatkiem Cu i Ag techniką wysokorozdzielczej transmisyjnej mikroskopii elektronowej
Autorzy:: Tokuda, M.
Matsuda, K.
Nagai, T.
Kawabata, T.
Nakamura, J.
Ikeno, S.
Powiązania:: https://bibliotekanauki.pl/articles/353776.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Al-Mg-Si alloy
precipitation
effect of Ag/Cu
TEM
stop AlMgSi
wydzielenia
wpływ Cu i Ag
Opis:: It has been known that Cu- and Ag-added Al-1.0mass%Mg2Si alloys (Al-Mg-Si-Cu alloy and Al-Mg-Si-Ag alloy) have higher hardness and elongation than those of Al-1.0mass%Mg2Si alloy. In this study, the aging behaviour of Al-Mg-Si-Cu alloy, Al-Mg-Si-Ag alloy and (Cu+Ag)-addition Al -1.0 mass% Mg2Si alloy has been investigated by hardness test and TEM observation. The Al-Mg-Si-Cu-Ag alloy has the fastest age-hardening rate in the early aging period and the finest microstructure at the peak hardness among three alloys. Therefore the microstructure of the precipitate in Al-Mg-Si-Cu-Ag alloy has been investigated by HRTEM observation to understand the effect of Cu and Ag addition on aging precipitation.
Znanym jest, że stopy Al-1.0 %wag. Mg2Si z dodatkiem Cu i Ag (stopy Al-Mg-Si-Cu i Al-Mg-Si-Ag) charakteryzują się wyższą twardością i większym wydłużeniem niż stopy Al-1.0 %wag. Mg2Si. W pracy badano proces starzenia stopów Al-Mg-Si-Cu, Al-Mg-Si-Ag oraz Al-1.0 %wag. Mg2Si z dodatkiem (Cu+Ag) przy użyciu pomiarów twardości i transmisyjnej mikroskopii elektronowej. Stop Al-Mg-Si-Cu-Ag charakteryzuje się najszybszym wzrostem twardości w początkowym etapie starzenia i najbardziej rozdrobniona mikrostruktura dla maksimum twardości sposród trzech badanych stopów.Wzwiązku z tym, mikrostruktura wydzieleń w stopach Al-Mg-Si-Cu-Ag zbadana została technika wysokorozdzielczej mikroskopii elektronowej w celu zrozumienia wpływu Cu i Ag na proces wydzielenia podczas starzenia.
Źródło:: Archives of Metallurgy and Materials; 2013, 58, 2; 363-364
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Development of a magnetic field monitoring system for the JAERI AVF cyclotron
Autorzy:: Okumura, S.
Arakawa, K.
Fukuda, M.
Nakamura, Y.
Yokota, W.
Ishimoto, T.
Kurashima, S.
Ishibori, I.
Nara, T.
Agematsu, T.
Nakajima, T.
Powiązania:: https://bibliotekanauki.pl/articles/148733.pdf
Data publikacji:: 2003
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: compensation coil
cyclotron
magnetic field
Opis:: We have developed a probe of a nuclear magnetic resonance (NMR) magnetometer for measurement of a fluctuation of an AVF cyclotron field. The stability of the magnetic field of the JAERI AVF cyclotron, measured with the NMR probe, was within 1 × 10-5. A field-measurement accuracy of the order of 1 × 10-6 was achieved using a set of field-compensation coils and optimizing the probe position to obtain enough homogeneity of the magnetic field around the probe for measuring the cyclotron field with a high gradient. To eliminate a major bottleneck in the field measurement inside the cyclotron, the probe was specially produced with the cable shielding against RF noises and proper materials applied.
Źródło:: Nukleonika; 2003, 48,suppl.2; 35-37
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Pressure Effect on Yb-Based Strongly Correlated Electron Systems
Autorzy:: Mito, T.
Otani, M.
Nakamura, M.
Koyama, T.
Wada, S.
Kotegawa, H.
Kobayashi, T.
Idzikowski, B.
Reiffers, M.
Sarrao, J.
Powiązania:: https://bibliotekanauki.pl/articles/1810284.pdf
Data publikacji:: 2009-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.27.+a
75.30.Kz
75.30.Mb
76.60.-k
Opis:: We studied pressure effects on $YbCu_5$ and $YbInCu_4$, good examples of the Yb-based compounds to investigate the nonmagnetic-magnetic transition in Yb-based strongly correlated electron systems. With increasing pressure, the low-temperature Fermi liquid state of $YbCu_5$ is gradually suppressed, suggesting the second-order like nonmagnetic-magnetic transition around the pressure of 5-6 GPa. On the other hand, in $YbInCu_4$ which has a pressure-induced magnetic ordered ground state above $P_C$=2.45 GPa, both high-temperature paramagnetic and low-temperature intermediate valence phases are insensitive to pressure. Our results confirm the first-order nature of the transition between the intermediate valence and magnetic ordered phases with pressure.
Źródło:: Acta Physica Polonica A; 2009, 115, 1; 47-52
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Single-electron transport characteristics in quantum dot arrays due to ionized dopants
Autorzy:: Moraru, D.
Ligowski, M.
Tarido, J. C.
Miki, S.
Nakamura, R.
Yokoi, K.
Mizuno, T.
Tabe, M.
Powiązania:: https://bibliotekanauki.pl/articles/384277.pdf
Data publikacji:: 2009
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: single dopant
silicon nanowire
single-electron transport
single-electron transfer
Opis:: Single charge manipulation for useful electronic functionalities has become an exciting and fast-paced direction of research in recent years. In structures with dimensions below about 100 nm, the physics governing the device operation turn out to be strikingly different than in the case of larger devices. The presence of even a single charge may completely suppress current flow due to the basic electronelectron repulsion (so called Coulomb blockade effect) [1]. It is even more exciting to control this effect at the level of single-electron/single-atom interaction. The atomic entity can be one donor present in silicon lattice with a Coulombic potential well. In principle, it can accommodate basically a single electron. We study the electrical behavior of nanoscale-channel silicon-on-insulator field-effect transistors (SOI-FETs) that contain a discrete arrangement of donors. The donors can be utilized as "stepping stones" for the transfer of single charges. This ability opens the doors to a rich world of applications based on the simple interplay of single charges and single atoms, while still utilizing mostly conventional and well established fabrication techniques. In this work, we distinguish the effects of single-electron transport mediated by one or few dopants only. Furthermore, we show how the single-electron/single-donor interaction can be tuned by using the external biases. We demonstrate then by simulation and experiment the feasibility of single-electron/bit transfer operation (single-electron turnstile).
Źródło:: Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 52-54
1897-8649
2080-2145
Pojawia się w:: Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: R&D of novel medicinal materials for curing cancer: sugar modified Gd-DTPA MRI contrast agents and phospha sugar anti-cancer agents
Autorzy:: Yamashita, Y.
Yamashita, M.
Fujie, M.
Suyama, K. A. T.
Ito, S.
Reddy, V. K.
Yamada, M.
Ogawa, K.
Ozaki, N.
Nakamura, S.
Aoki, T.
Yu, G.
Aoshima, K.
Kato, T.
Kamikage, N.
Kiyofuji, K.
Takehara, Y.
Sakahara, H.
Takayanagi, H.
Oshikawa, T.
Laurent, S.
Burtea, C.
Van der Elst, L.
Muller, R. N.
Powiązania:: https://bibliotekanauki.pl/articles/385218.pdf
Data publikacji:: 2009
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: MRI contrast agent
sugar-ball-dendrimer
Gd (III)-DTPA complex
phospha sugars
phospholanes
anticancer agent
tumor
Opis:: Novel Sugar Dendritic Gd-DTPA Complexes for MRI Contrast Agents were prepared and evaluated by in vitro and in vivo methods. The sugar dendritic MRI contrast agents have a good blood vesse pool character, and draw blood vessels and liver cancer remarkably clearer than the clinically using Gd-DTPA. Phospha sugar derivatives or phosphorus heterocyclic derivatives provided by functional groups such as epoxide, bromide, etc., were prepared and evaluated by MTT in vitro method. These phospha sugar derivatives showed excellent activities against leukemia cells as well as solid cancer cells in fashions of (i) higher activity, (ii) wider spectra, (iii) higher selectivity and specificity distingushing healthy and cancer cells, etc., compared with the molecular targeting chemotheraputic anti-cancer agent, Gleevec.
Źródło:: Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 80-83
1897-8649
2080-2145
Pojawia się w:: Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:: Biblioteka Nauki

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