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排序方式: 共有67条查询结果,搜索用时 15 毫秒
1.
Carbon fibre/poly (ether-ether-ketone) (PEEK) composites were fabricated from plain weave cloth using the commingled yarn of carbon fibres with PEEK filaments. The undirectional specimen was made from the warp of commingled yarn and the weft of PEEK yarn, while the two-dimensional specimen was made from commingled yarns both of the warp and the weft. During the hot-pressing process, PEEK filaments melt to form the matrix of the composite. The interlaminar fracture toughness of the commingled composite was measured and compared with that of the prepreg composite. The critical strain energy release rates,/'G
Ics, obtained for the commingled composites were higher than the prepreg composite. In particular, the two-dimensional composite exhibited higherG
Ic than the unidirectional commingled composite. Factors increasing the fracture toughness of commingled composites have also been investigated by SEM observation of the fractured surface. 相似文献
2.
Yutaka Takahasi 《国际水资源开发杂志》2001,17(4):555-561
One of the most important issues in avoiding a global water crisis is to solve the confrontation between developed and developing countries. As Japan in the 20th century has experienced the shift from a developing country to a developed country, it should candidly share its precious historical experience, both its merits and demerits, with people throughout Monsoon Asia. Two practical proposals to economize water demand are as follows: to economize toilet water in a way that meets the conditions of each region; and to develop the effective utilization of water for irrigated rice paddies, not only in the Monsoon Asia but throughout the world. In short, new life-styles are necessary if the global water crisis is to be averted. 相似文献
3.
4.
Yasuki Kakishita Kazutoshi Sasahara Tetsuro Nishino Miki Takahasi Kazuo Okanoya 《Data mining and knowledge discovery》2009,18(3):446-471
We propose an efficient automata-based approach to extract behavioral units and rules from continuous sequential data of animal
behavior. By introducing novel extensions, we integrate two elemental methods—the N-gram model and Angluin’s machine learning algorithm into an ethological data mining framework. This allows us to obtain the
minimized automaton-representation of behavioral rules that accept (or generate) the smallest set of possible behavioral patterns
from sequential data of animal behavior. With this method, we demonstrate how the ethological data mining works using real
birdsong data; we use the Bengalese finch song and perform experimental evaluations of this method using artificial birdsong
data generated by a computer program. These results suggest that our ethological data mining works effectively even for noisy
behavioral data by appropriately setting the parameters that we introduce. In addition, we demonstrate a case study using
the Bengalese finch song, showing that our method successfully grasps the core structure of the singing behavior such as loops
and branches.
Yasuki Kakishita and Kazutoshi Sasahara have contributed equally to this work. 相似文献
5.
L Wang K Yokoyama H Takahasi N Kase Y Hanya K Yashiro M Miyaji K Nishimura 《International journal of food microbiology》2001,71(1):75-86
The partial sequences of the mitochondrial (mt) cytochrome b gene (402 bp) were determined for species of Aspergillus section Flavi. On the basis of identities of DNA sequences, 77 strains were divided into seven DNA types, from D-1 to D-7. The type strains of A. sojae, A. parasiticus, A. flavus and A. oryzae together, A. tamarii, and A. nomius were placed in DNA types D-1. D-2, D-4, D-5 and D-7, respectively. These species could be differentiated from each other. Furthermore, two other DNA types, D-3 and D-6 were found. DNA type D-3 was closely related to A. parasiticus (D-2) and included one strain that deposited as A. flatus var. flavus and produced aflatoxins B and G. DNA types D-6 included one strain named A. flavus and closely related to A. tamarii. The observations of conidial wall texture by SEM (Scanning Electron Microscopy) supported the relationships derived from the cytochrome b gene. The production of aflatoxins was also examined. Using the DNA sequence of cytochrome b gene, several strains were reidentified. The derived amino acids sequences were all the same in the studied strains. The mt cytochrome b gene is useful and reliable in distinguishing and identifying the species in Aspergillus section Flavi. 相似文献
6.
Summary Dilatometrically determined initial rate of alternating copolymerization of anethole (M1) and maleic anhydride (M2) in methyl ethyl ketone (MEK) is reported for the total monomer concentrations of 1M, 2M and 3M polymerized at 50°C with AIBN. The rate is larger than the first order with respect to the monomer concentration. The simplified complex model adopted by Shirota et al is found to be consistent with the data. The equilibrium constant of donor-acceptor complexation (C) of the comonomers is measured to be K=0.057 M–1 in MEK at 26°C. The ratios of the propagation rate constants are calculated to be k1c/k12=D=2 and k2c/k21=A=6. 相似文献
7.
In humans and animals, intestinal flora is indispensable for bile acid transformation. The goal of our study was to establish
gnotobiotic mice with intestinal bacteria of human origin in order to examine the role of intestinal bacteria in the transformation
of bile acids in vivo using the technique of gnotobiology. Eight strains of bile acid-deconjugating bacteria were isolated from ex-germ-free mice
inoculated with a human fecal dilution of 10−6, and five strains of 7α-dehydroxylating bacteria were isolated from the intestine of limited human flora mice inoculated
only with clostridia. The results of biochemical tests and 16S rDNA sequence analysis showed that seven out of eight bile
acid-deconjugating strains belong to a bacteroides cluster (Bacteroides vulgatus, B. distasonis, and B. uniformis), and one strain had high similarity with Bilophila wadsworthia. All five strains that converted cholic acid to deoxycholic acid had greatest similarity with Clostridium hylemonae. A combination of 10 isolated strains converted taurocholic acid into deoxycholic acid both in vitro and in the mouse intestine. These results indicate that the predominant bacteria, mainly Bacteroides, in human feces comprise one of the main bacterial groups for the deconjugation of bile acids, and clostridia may play an
important role in 7α-dehydroxylation of free-form primary bile acids in the intestine although these strains are not predominant.
The gnotobiotic mouse with bacteria of human origin could be a useful model in studies of bile acid metabolism by human intestinal
bacteria in vivo. 相似文献
8.
Nozomu Takeuchi Mitsuharu Murase Yasuharu Nomura Haruto Takase Kiyohisa Uchida 《Lipids》1987,22(8):566-571
In order to investigate the effect of hepatic cholesterol flux on biliary bile acids, Triton WR 1339 and orotic acid were
administered to rats, and the biliary cholesterol, phospholipids and bile acids were analyzed together with serum lipoproteins
and hepatic lipids. Triton, which raised serum very low density lipoprotein and lipid levels and decreased serum high density
lipoprotein liver lipid levels, increase the biliary cholic acid group/chenodeoxycholic acid group ratio (CA/CDCA) in the
bile without affecting the total amount of bile acids and the other biliary lipids. Orotic acid, which decreased serum lipid
and lipoprotein concentrations and increased liver lipid levels, increased the biliary excretion of cholesterol and phospholipids,
but produced no significant change in the total amount of bile acids and in the CA/CDCA ratio in bile. 相似文献
9.
Satoshi Kaneco Kenji Iiba Nobu-hide Hiei Kiyohisa Ohta Takayuki Mizuno Tohru Suzuki 《Electrochimica acta》1999,44(26):4701
The electrochemical reduction of CO2 with a Cu electrode in CsOH/methanol-based electrolyte was investigated. The main products from CO2 were methane, ethylene, ethane, carbon monoxide and formic acid. A maximum Faradaic efficiency of ethylene was 32.3% at −3.5 V vs. Ag/AgCl saturated KCl. The best methane formation efficiency was 8.3% at −4.0 V. The ethylene/methane current efficiency ratio was in the range 2.9–7.9. In the CsOH/methanol, the efficiency of hydrogen formation, being a competitive reaction against CO2 reduction, was depressed to below 23%. 相似文献
10.
The role of fatty acids (FA) as a mediator and modulator of central nervous system activity in general, and peptides in particular, is only recently becoming understood. This paper reviews numerous findings concerned with the activity of fatty acids, particularly with their interaction with diverse neurochemical systems and their consequences for better understanding neurotransmitters, hormones and peptides. The effects include FA as precursors in the manufacture of neurochemical elements, including enzymes, neurotransmitters, and hormones. Of particular interest is the important changes in neuronal membrane composition that have been attributed to FA. Such changes may account for the changes in thermoregulation, learning, and other functions that accompany dietary manipulation of FA intake. While the total level of FA has been the object of many investigations, this report addresses the need to focus on the ratio of FA, especially alpha-linolenic/linoleic acid, which has been shown to be a critical factor in a number of research studies. 相似文献