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排序方式: 共有319条查询结果,搜索用时 15 毫秒
41.
Fujikawa H Yano K Morozumi S 《Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan》2006,47(3):95-98
Characteristics of the growth kinetics of Escherichia coli cells in pouched mashed potatoes under various conditions were studied with a mathematical model. Bacterial cells were inoculated in sterile mashed potatoes and then sealed in vinyl pouches, in which a very small amount of air was included. The growth curves of cells in the pouched mashed potatoes at constant temperature (12-34 degrees C) were sigmoidal with time on a semi-logarithmic plot and were successfully described with a new logistic model recently developed by us. The rate constant of growth showed a highly linear relationship to the temperature with the square-root model, and the lag period was longer at lower temperatures. The growth curve in glass tubes containing a large volume of air was similar to that in pouches, showing that the rate of growth was not affected by the volume of the surrounding air. The growth curves in pouched mashed potatoes were very similar to those in nutrient broth or on the surface of nutrient agar, which we previously reported. These results suggested that the growth kinetics of the bacterial cells under various conditions of rich nutrition might be almost identical, and can be described with a simple growth model like ours. 相似文献
42.
43.
Muto S Tatsumi K Puetter RC Yoshida T Yamamoto Y Sasano Y 《Journal of electron microscopy》2006,55(4):225-230
We applied Pixon deconvolution as introduced in Part I to several practical, examples of low signal-to-noise ratio (SNR), electron energy-loss spectra with a goal toward restoring their fine spectral features and/or improving the energy resolution. We demonstrate that by directly fitting the two-dimensional spectral data recorded on the CCD; the method enables us to reveal fine spectral structures. Consequently, Pixon reconstruction extends the ability to probe electronic states in very spatially localized areas, a capability currently unique to our method. 相似文献
44.
Seong Su Kim Ha Na Yu In Uk Hwang Dai Gil Lee Seong Nam Kim Kazuyoshi Suzuki Hiroyuki Sada 《Tribology Letters》2009,35(3):211-219
The friction and wear behaviour of SiC, Si3N4 and SiC/Si3N4 composite ceramics were investigated with oscillating sliding (gross slip fretting) at room temperature. The influence of
counter body material and the humidity of the surrounding air was studied with a ball-on-disc configuration with different
ball materials (1000Cr6, Al2O3 SiC and Si3N4). The effect of RH on friction is marginal with exception of SiC (low friction) as counter body material. The wear behaviour,
however, is strongly affected by humidity, showing inverse trends for different counter body materials. Consequently, the
wear behaviour of a tribo couple can be improved by selecting an adequate mating material. The results reveal the necessity
to control RH in tribological tests. For estimation of the performance of tribo couples under varying environmental conditions,
a variation of RH is required. In tribo couples with single phase SiC, either as ball or disc, the tribological behaviour
of the system is dominated by SiC. The friction behaviour of the composite material is in between the behaviour of the two
single phase materials, Si3N4 and SiC, whereas the wear behaviour is very similar to that of single phase Si3N4. 相似文献
45.
Toru Nakajima Kazuyoshi Shiba Kazuya Tamegaya Kiyokazu Tsukamoto 《Welding International》2013,27(10):752-758
Recently, the electron beam welders with high acceleration voltage (more than 100 kV) and high electrical power (more than 15 kW) have been reviewed the role of the high-energy electron beam density again, due to space or aircraft development or automobile industry desired high productivity and high accurate welding for saving energy. NEC group have supplied these electron beam welders. This time, the automatic alignment adjustment system of the electron beam orbit and the automatic adjustment system of filament current were developed and put to a practical use. As a result, the great effectiveness for the stability of welding quality was apparent. 相似文献
46.
Chiba T Wauke T Sadamasu K Yano K Morozumi S 《Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan》2007,48(1):1-7
The identification of 20 strains of yeasts isolated from foods by means of DNA sequence analysis with two kinds of universal primers for the rDNA region was examined, and the results were compared with those of the conventional phenotyping test using API 20C AUX. In the analysis of the 26S region, all 20 yeast strains tested were identified at the species level. In the ITS1 region, 16 strains were also classified at the species level. In addition, all results of DNA sequence analysis were consistent with those of the phenotyping test at the genus level. Furthermore, DNA sequence analysis was able to identify causative yeasts observed in two suspect foods, though phenotyping tests alone failed to identify them. 相似文献
47.
Ryo Ishihara Shiho Asai Shigeyoshi Otosaka Shinsuke Yamada Hideyuki Hirota Kazuyoshi Miyoshi 《溶剂提取与离子交换》2013,31(2):171-180
An octadecylamino-group-introduced polymer chain grafted onto a porous sheet was impregnated with bis(2-ethylhexyl)hydrogen phosphate (HDEHP). A mixture of HDEHP and ethanol of various HDEHP concentrations was used for the impregnation. The porous sheet into which a C18H37NH group was introduced was immersed in HDEHP/ethanol solution before ethanol evaporation. The liquid permeability of a cartridge charged with the HDEHP-impregnated porous sheet in disk form prepared in 50 (v/v)% HDEHP/ethanol solution was 96% that of the starting-porous-disk-packed cartridge. The equilibrium binding capacity of the HDEHP-impregnated porous disk for yttrium ions was 0.32 mol per kg of the disk. In addition, the HDEHP-impregnated-porous-disc-packed cartridge was found to be applicable to the preconcentration of trace amounts of lanthanides in a multielement solution prior to their measurement by inductively coupled plasma mass spectrometry. 相似文献
48.
Kazuyoshi Yata 《Sequential Analysis》2013,32(4):463-482
We consider fixed-size estimation for a linear function of mean vectors from π i : N p (μ i , Σ i ), i = 1,…, k. The goal of inference is to construct a fixed-span confidence region with required accuracy. We find a new sample-size formulation and propose a two-stage estimation methodology to give the fixed-span confidence region satisfying the probability requirement approximately. We show that the proposed methodology greatly reduces the sample size to enjoy the asymptotic first-order consistency when the dimensionality p is extremely high. With the help of simulation studies, we show that the proposed methodology is still efficient even when p is moderate. We give an actual example to illustrate how it should be done by using the proposed methodology in the inference. 相似文献
49.
Tadao Shibuya Masahiro Yoshinaka Futoshi Utsuno Kazuyoshi Inoue Jung J. Kim Masaaki Obata 《Thin solid films》2010,518(11):3008-3011
The electronic structural analysis of the conductive transparent films was carried out using bulk sensitive hard X-ray photoelectron spectroscopy (HAXPES). The In2O3-ZnO film has amorphous structure before and after annealed, and the conduction band spectrum around Fermi level showed the similar spectra with that of as-deposited amorphous In2O3 film. In these amorphous films, the conduction band minimum locates at the deeper level than the crystalline In2O3 film. The electronic state which comes from randomness of amorphous structure possibly exists around this level or below. These electrons are expected to act as scattering center. We concluded that the electron mobility depends on the density of this electronic state. 相似文献
50.
Surface properties of carbon micro-coils oxidized by a low concentration of oxygen gas 总被引:1,自引:0,他引:1
Vapor-grown carbon micro-coils were oxidized under a low O2 flow-rate for introducing oxygen-containing functional groups on the surface. The surface characteristics were then examined. The O1s/C1s intensity ratios of the XPS spectra measured on the surface increased on using the oxidation treatment. The maximum O1s/C1s ratio of 11.4 at.% was obtained under the following conditions: (a) the flow-rate of the mixed gas of O2+Ar (O2/Ar=1/10) was 82.5 sccm; (b) the oxidation temperature was 600°C; and (c) the treatment time was 30 min. The maximum O1s/C1s ratio is about 3.5 times that of the source carbon coils. The specific surface area significantly increased due to the oxidation treatment and attained a maximum value of 1050 m2 g−1, which is about 10 times that of the source carbon coils. As the specific surface area increased, the surface morphology of the carbon coils became more complicated on a nanometer scale. 相似文献