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21.
22.
Based on the adders with a minimum number of NOR gates discussed in Ref. 1, parallel multiplers are designed in Ref. 2, using fewer gates, fewer connections, and faster operation than conventional multipliers based on carry-save adders. In this paper, parallel multipliers of NOR gates are designed, by expressing two numbers to be multiplied in the sign and magnitude representation unlike those in Ref. 2. The multipliers in this paper are advantageous over the carry-save adder-type multipliers known to date, in terms of the number of gates and connections.This work is supported in part by the National Science Foundation under Grant No. MCS77-09744 and MCS81-08505. 相似文献
23.
The flow behavior of molding compounds such as phenolics, melamines, and ureas was examined by a monohole flow test in which the compounds were high frequency-preheated up to the test temperature just prior to being put into the monohole mold. The effect of temperature, pressure, and water content on the flowability has been clarified as follows: (1) The relation between log flow rate and reciprocal absolute temperature consists of two straight lines with different slopes, showing dual activation energies for flow above and below an inflection point. The phenomenon suggests the existence of a phase transition in a resin flow. (2) The inflection point shifts to the lower temperature side with an increase of pressure and water content. (3) The influence of water content on the flowability varies largely according to compatibility between resins and water. (4) The temperature dependence of flow rate in a urea compound decreases during storage due to the advancement of condensation. 相似文献
24.
25.
Hirohisa Maki Shyuji Saeki Isao Ikeda Saburo Komori 《Journal of the American Oil Chemists' Society》1969,46(12):635-638
The authors synthesized nonionic surfactants containing dimethylpolysilane, dimethylpolysilmethylene and dimethylopolysiloxane
as the hydrophobic groups, and investigated their surface activities. In their ability to lower the aqueous surface tension,
the polysiloxane surfactants were the most active, and there is little reason to choose between the other two kinds of surfactants.
With regard to the ability of lowering the interfacial tension between water and silicone oil, the polysilmethylene surfactants
were most effective when the concentration of aqueous solution was below 0.5 wt %. Above this concentration, however, the
polysiloxane surfactants were superior. Also investigated was the lowering of surface tension of nonaqueous polyols and their
ability to wet low energy hydrophobic surfaces such as polyethylene. 相似文献
26.
Saburo Hosokawa Yukihiro Hayashi Seiichiro Imamura Kenji Wada Masashi Inoue 《Catalysis Letters》2009,129(3-4):394-399
Ceria colloidal particles with a mean crystallite size of 2 nm were synthesized by a solvothermal reaction. The Ru/CeO2 catalyst prepared from the CeO2 colloids exhibited higher activity than the catalyst prepared from Ce(NO3)3. Temperature-programmed reduction analysis indicated that the reduction of surface Ce4+ was accelerated by highly dispersed Ru species on the CeO2 particles and occurred at low temperatures. The single component CeO2 sample prepared by the coagulation of the CeO2 colloid was more easily reduced and re-oxidized than the CeO2 sample prepared by the precipitation method from Ce(NO3)3. The higher activity of Ru/CeO2 prepared from the CeO2 colloids came from the inherent nature of the CeO2 support itself. 相似文献
27.
Dyeing wastewater collected in Kyoto city, Japan, was investigated for the occurrence of aryl hydrocarbon receptor (AhR) ligands by using an AhR-responsive reporter gene assay. Concentrated extracts of wastewater samples elicited a dose-dependent increase in AhR ligand activity, and several hydrophobic HPLC fractions of the extracts were highly effective in inducing AhR ligand activity. Three potential AhR ligands were isolated from these fractions and identified to be Disperse Red 92, Disperse Yellow 64, and 3'-hydroxybenzo[b]quinophthalone by using HPLC and LC-MS/MS. Disperse Red 92, which has also been detected in the treated effluent from a sewage plant receiving the wastewater, is an anthraquinone disperse dye showing weak AhR binding affinity in the assay. Disperse Yellow 64 and 3'-hydroxybenzo[b]quinophthalone are quinoline disperse dyes capable of activating the AhR at nanomolar concentrations. In particular, Disperse Yellow 64 is a highly potent AhR ligand that was 3 times more effective in inducing AhR ligand activity than beta-naphthoflavone in the assay. Quinoline disperse dyes are suggested to be a new class of xenobiotic AhR ligands which pose a danger to aquatic biota and human health. 相似文献
28.
Deposited road particles (DRPs) collected from 13 heavily traveled roadways in an urban area of Southern Lake Biwa, Japan, were analyzed for polycyclic aromatic hydrocarbons (PAHs) in seven different particle size fractions (< or = 20 to 1000-2000 microm) and evaluated for the aryl hydrocarbon receptor (AhR) ligand activity by using a yeast bioassay. The mean compositions of individual PAHs to total PAH concentrations in different particle size fractions were 19-21% for pyrene, which was the most dominant component, 14-16% for fluoranthene, and 7-13% for benzo[g,h,i]perylene, which were the next dominant components. The total PAH distribution pattern in different particle size fractions of DRPs was different from the organic matter distribution pattern which increased with decreasing particle size of DRPs, and could be explained by the differences in their sources. Moreover, AhR ligand activities were observed in the DRP extracts of all size fractions. The activity of the DRP extracts from the smallest size fraction was approximately 5 times more potent than that of the largest size fraction in a yeast AhR ligand activity assay. The mean contribution (%) of benzo[k]-fluoranthene, chrysene, benzo[b]fluoranthene, and benzo[a]pyrene to the AhR activity of DRP extracts in all size fractions was 1.43-4.11%, 1.63-3.53%, 0.63-1.69%, and 0.31-1.42%, respectively. Although the contribution of PAHs to AhR ligand activity presented in the DRP extracts was relatively low (below 10%), it may be best to remove these DRPs before discharge to receiving water environments. 相似文献
29.
Takashi Wakuda Kazuo Azuma Hiroyuki Saimoto Shinsuke Ifuku Minoru Morimoto Ichiro Arifuku Masahito Asaka Takeshi Tsuka Tomohiro Imagawa Yoshiharu Okamoto Tomohiro Osaki Saburo Minami 《Journal of Functional Foods》2013,5(1):516-523
The effects of pear vinegar (PV), which was specially brewed for enhanced galacturonic acid content, on the DSS-induced ulcerative colitis (UC) mouse model were evaluated. PV improved clinical symptoms, colon inflammation, and histological tissue injury in the DSS-induced acute UC mouse model. Moreover, PV suppressed inflammation due to acute UC by suppressing the myeloperoxidase (MPO)-mediated activation of inflammatory cells such as leukocytes and decreasing the serum concentration of IL-6. Our results demonstrated the protective action of PV in the DSS-induced acute UC mouse model. On the other hand, commercial apple vinegar did not show a protective effect in the DSS-induced acute UC mouse model. Our findings indicate that PV may act as a new functional food for inflammatory bowel disease patients. 相似文献
30.
Yuhei Ogawa Junichiro Yamabe Hisao Matsunaga Saburo Matsuoka 《International Journal of Hydrogen Energy》2017,42(26):16887-16900
In order to develop safer and more energy-efficient, hydrogen pre-cooling systems for use in hydrogen refueling stations, it is necessary to identify a high-strength metallic material with greater thermal conductivity and lower susceptibility to hydrogen embrittlement, as compared with ordinary, stable austenitic stainless steels. To accomplish this task, the hydrogen compatibility of a precipitation-hardened, high-strength, copper-based alloy was investigated by slow-strain-rate tensile (SSRT), fatigue-life, fatigue-crack-growth (FCG) and fracture toughness tests in 115-MPa hydrogen gas at room temperature. The hydrogen solubility and diffusivity of the alloy were also determined. The hydrogen solubility of the alloy was two or three orders of magnitude lower than that of austenitic stainless steels. The alloy also demonstrated absolutely no hydrogen-induced degradation of its strength properties, a factor which could contribute to the reduction of costs related to the construction and maintenance of hydrogen refueling stations, owing to the downsizing and improved cooling performance of the pre-cooling systems. 相似文献