※一部利用できない機能があります
| 1.
論文 |
論文
|
HUANG, Zuohua ; SHIGA, Seiichi ; UEDA, Takamasa ; JINGU, Nobuhisa ; NAKAMURA, Hisao ; ISHIMA, Tsuneaki ; OBOKATA, Tomio ; TSUE, Mitsuhiro ; KONO, Michikata
概要:
application/pdf<br />Journal Article<br />A basic characteristics of compressed natural gas direct-injection (CNG DI) co
…
mbustion was studied by using a rapid compression machine. Results show that comparing with homogeneous mixture, CNG DI has short combustion duration, high pressure rise due to combustion, and high rate of heat release, which are considered to come from the charge stratification and the gas flow generated by .the fuel injection. CNG DI can realize extremely lean combustion which reaches 0.03 equivalence ratio, φ. Combustion duration, maximum pressure rise due to combustion and combustion efficiency are found to be insensitive to the injection modes. Unburned methane showed almost the same level as that of homogeneous mixture combustion. CO increased steeply with the increase in φ when φ was greater than 0.8 due to the excessive stratification, and NO_x peak value shifted to the region of lower φ. Combustion inefficiency maintains less than 0.08 in the range of φ from 0.1 to 0.9 and increases at very low φ due to bulk quenching and at higher φ due to excessive stratification. The combustion efficiency estimated from combustion products shows good agreement with that of heat release analysis.
続きを見る
|
||
| 2.
論文 |
論文
|
Harasawa, J ; Uehara, H ; Yamanobe, T ; Komoto, T ; Terano, M
概要:
application/pdf<br />Journal Article<br />Morphological studies were conducted to investigate the drawability of melt-quenched (MQ) and slowly cooled (MSC) films of syndiotactic polypropylene (sPP) with a high syndiotactic pentad
…
fraction. Transmission electron microscopy (TEM) using the ruthenium tetraoxide staining and ultrathin sectioning method revealed that amorphous chains as the matrix of MQ film played a role in drawability of the film by their alignment to machine direction (MD) and partial crystallizations into nanofibrils. On the other hand, the initial strain induced, rotations of clusters of long lamellar crystals as the major entity of MSC film accompanying breaks of long lamellae and formation of crazes and microvoids at the cluster boundary. Compared with a homogeneous thinning of MQ film by drawing, ca. 100 nm-thick layer slips along MD and parallel to the film surface took place in MSC film. This gave rise to the formation of V-shaped bent lamellar morphology and their further break into a smaller cluster of stacked lamellae which were aligned oblique by ca. 35 from MD. With elongation, some nanofibrils formed from chains generated by the partial breaks of lamellae are aligned perpendicular to the remained oblique lamellae and others parallel to MD in region where lamellar morphology almost disappeared. No chain slips in the nanofibrils can be related to a low elongation at break, i.e. a low ductility of sPP films. The lower elongation at break for MSC film than for MQ one can be interpreted by microvoids initially formed in the neck region and later moved to the fully drawn part, the microvoids initiating the break of the drawn film.
続きを見る
|
||
| 3.
論文 |
論文
|
Ido, Ryo
概要:
application/pdf<br />Departmental Bulletin Paper<br />We will be concerned with repetition and will investigate its contribution to the hearer's interpretation of an utterance. Sperber and Wilson (1986/1995^2) and Jucker (1994) suggest the
…
analyzability of repetition from the principle of relevance. We will elaborate on these analyses from the processing effort side of relevance, and show that repetition is used not only to increase cognitive effects, but also to save the hearer's processing effort, so that it is considered as encoding procedural information.
続きを見る
|
||
| 4.
論文 |
論文
|
概要:
application/pdf<br />Departmental Bulletin Paper
|
||
| 5.
論文 |
論文
|
HAYASHIDA, Kazuhiro ; SHIRAI, Hiroyuki ; AMAGAI, Kenji ; ARAI, Masataka
概要:
application/pdf<br />Journal Article<br />Rotational temperature of NO molecule in methane/air premixed flame was estima
…
ted by a spectral matching method. A tunable narrow band ArF excimer laser was used to excite the D^2Σ^+ ← X^2∏(0,1) band system of NO. Laser beam was introduced in a flame, and the laser-induced fluorescence was resolved into a spectrum by using a spectrograph. On this spectrum, e and δ bands of upper vibrational level of v'=0 were analyzed. In order to use a spectral matching method, profiles of ε and δ band spectra were calculated theoretically in detail with reliable molecular constants and exact equations, and they were modulated by an experimental slit function. Since the profile of band spectrum was determined as a function of a rotational temperature, a rotational temperature could be estimated using the temperature where the profile of every band spectrum obtained theoretically is fitted to that of experimentally obtained. Applying a spectral matching method on the ε(0,3), ε(0,4) and δ(0,2) band of NO, it was obtained that the rotational temperature is about 1000 K. The obtained rotational temperature is almost agreed with the thermocouple temperature.
続きを見る
|
||
| 6.
論文 |
論文
|
Naito, Y ; Komoto, T ; Yamanobe, T
概要:
application/pdf<br />Journal Article<br />VT CPMAS NMR measurements were carried out for a series of poly(alkyl L-glutamate)s (PALG) which have n-alkyl side chains with carbon numbers ranging from 2 to 12 in order to investigate the
…
structure and mobility of the main and the side chains. From the temperature dependencies of the peak intensities for the PALGs, the relative mobilities of the main and side chains are discussed. For PG-2 and PG-4, the molecular motions of both the main and side chains are not very fast. From the amount ratio between the main and side chains, the main chain dominates the entire mobility of the polymer. As the side chain length increases, the side chain motion is drastically activated by a temperature change. In addition, the main chain motion is induced by the side chain motion. For PALGs with long alkyl side chains, the mobilities of the polymers are governed by the structure and mobility of the side chain.
続きを見る
|
||
| 7.
論文 |
論文
|
7. Molecular motion of the main chain for a series of poly(alkyl L-glutamate)s as studied by H-2 NMR
Yamanobe, T ; Naito, Y ; Iwakura, Y ; Komoto, T
概要:
application/pdf<br />Journal Article<br />H-2 NMR measurements were carried out for a series of poly(alkyl L-glutamate)s (PALG) in which the H-1 of the amide group in the main chain is replaced by H-2 in order to investigate the mobility
…
and motional mode of the main chain. At low temperature, the H-2 spectra were typical powder patterns, which have three principal values. The temperature dependencies for the H-2 NMR spectra varied with the side chain length. For PALG with a short side chain length, Deltanu(1), Deltanu(2), and Deltanu(3) are almost constant in all temperature ranges. As the side chain length increases, the difference between the peaks and shoulders decreased with temperature. For PG-12-N-D, the peaks and shoulders are fused at high temperature in a liquid crystalline state. The mobility and molecular motion of the main chain is discussed based on the obtained H-2 NMR spectra.
続きを見る
|
||
| 8.
論文 |
論文
|
Takayama, Kiyoshige ; Kumaki, Iku ; Motegi, Shunichi ; Hou, Xing Hua ; Tatemoto, Kazuhiko
概要:
application/pdf<br />Departmental Bulletin Paper<br />We examined cardiovascular responses to the injection of apelin-12 (AP12) into the ventral medullary surface (VMS) in Wistar rats anesthetized with ethyl carbamate and
…
pentobaribital sodium. We found that the injection of AP12 into the VMS induced pressor and tachycardiac responses. With stepwise increases in the dose (1nmol/kg. 5 nmol/kg. lOnmol/kg), the pressor and tachycardiac responses increased dose-dependently. The present results suggest that apelin peptides may play some roles in central ardiovascular regulation.
続きを見る
|
||
| 9.
論文 |
論文
|
Ichimura, Sachiko ; Nemoi, Mitsuru ; Hamana, Koei
概要:
application/pdf<br />Departmental Bulletin Paper<br />Changes of cellular polyamine levels in HeLa S3 cells after carbon-ion beam irradiation were determined. The increase in DNA level of the irradiated cells was similar to
…
that of nonirradiated population until 40 hr. Putrescine in irradiated cells remains lower level in spite of the remarkable increase in normal cells.
続きを見る
|
||
| 10.
論文 |
論文
|
Iwasaki, Kiyotaka ; Uchiyama, Yasushi
概要:
application/pdf<br />Departmental Bulletin Paper<br />An anonymous questionnaire was administered to 14 and OT students of Gunma University who participated in the study tour to 2 universities in US, which was conducted on March 2001. The
…
questions were asked in 4 areas that respectively dealt with (1) content of the program, (2) interaction with American students and faculties, (3) overall schedule of the program, and (4) tasks for a future program. The results showed that most of the students expressed that this program inspired them academically. Based on the result, appropriateness of length, schedule, content of the program, and tasks were discussed and proposed as 10 suggestions for a next program.
続きを見る
|
