Low energy indium or gallium ion implantations to SiO2 thin films for development of novel catalysts

It has been demonstrated that indium (In) implanted silicon dioxide (SiO thin films catalyze a reaction of benzhydrol with acetylacetone. In this study, it is found that the threshold In ion incident energy for manifestation of the catalytic effect exists between 400 and 470 eV. Furthermore, a technique to implant gallium (Ga) to SiOfilms has been developed with highly controlled doses and injection energies for the formation of thin films that promote Ga catalysts. The efficiency of catalytic reactions by Ga implanted SiOthin films is yet to be improved. Unlike In implanted SiO2, the reason why no significant reaction was observed in the case of Ga implanted SiOfilms examined in this study seems that the Ga ion energy was so low that deposited surface Ga atoms should lack interactions with Si atoms for the manifestation of catalytic reaction. © 2014 The Surface Science Society of Japan.Satoru Yoshimura, Masato Kiuchi, Yoshihiro Nishimoto, Makoto Yasuda, Akio Baba, Satoshi Hamaguchi, Low Energy Indium or Gallium Ion Implantations to SiO2 Thin Films for Development of Novel Catalysts, e-Journal of Surface Science and Nanotechnology, 2014, Volume 12, Pages 197-202, Released April 26, 2014, Online ISSN 1348-0391, https://doi.org/10.1380/ejssnt.2014.197, https://www.jstage.jst.go.jp/article/ejssnt/12/0/12_197/_article/-char/e

Wireless data transmission in a 560-GHz band using low-phase-noise terahertz wave generated by photomixing of a pair of distributed feedback lasers injection-locking to Kerr micro-resonator soliton comb

The demand for higher data rates in next-generation mobile wireless communication systems (6G) has led to significant interest in terahertz (THz) waves as a high-frequency, broad modulation bandwidth carrier wave. In this study, we propose and demonstrate a wireless data transfer in the 560-GHz band using low-phase-noise THz waves generated by photomixing of a pair of distributed feedback lasers injection-locking to Kerr micro-resonator soliton comb. Experimental results showed near-error-free on-off keying (OOK) data transfer at 1 Gbit/s in the 560-GHz band, with a Q-factor of 6.23, surpassing the error-free limit. Also, modulation formats of binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK) were successfully used, showing clear constellation diagrams and relatively low root mean squared error vector magnitude (rms EVM) values of 23.9% and 23.6%, respectively. Moreover, data transfer at 0.4 Gbit/s in 16 quadrature amplitude modulation (16QAM) demonstrated clear isolated symbols and achieved a low rms EVM value of 8.1%, complying with the IEEE 802.15.3d standard amendment. These demonstrations highlight the potential of using injection-locked DFB lasers with the Kerr micro-resonator soliton comb to achieve high-quality, high-speed wireless data transfer in the 560-GHz band. These findings contribute significantly to the advancement of wireless communication technology in the THz frequency range and pave the way for the realization of 6G wireless communication systems

Development of Free-Cutting Brass without Pb by Hot Extrusion

A direct consolidation of brass machined chips wastes has been attempted from a viewpoint of energy-saving and recyclability. A direct consolidation process from machined chips wastes has successfully been developed in our laboratory. So a free-cutting brass without Pb has been developed using this consolidation process in our laboratory by adding graphite powder and Cu2S powder as a substitution for Pb. However, ZnS formed during the extrusion processing disturbs the improvement of machinability of the extruded rod to which Cu2S is added. In this study, therefore, a surface of 6-4 brass machined chips was oxidized and dezincificated by heating in air in order to suppress the formation of ZnS. After extruding, the density and mechanical properties such as hardness, tensile strength and elongation of extruded rods decreased with an increment of Cu2S addition while an application of heat-treatment to machined chips suppressed a degree of drop in density and mechanical properties of extruded rods. Moreover, a machinability of extruded rods improved with increasing Cu2S addition and more obviously by heat-treatment

Consolidation of Free-Cutting Lead-Free Brass by Hot Extrusion and its Properties

Proceedings of 17th International Federation for Heat Treatment and Surface Engineering Congress (IFHTSE 2008), 27-30 October 2008, Kobe, Japa

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Mechanism of color development of the mud-mordanting dyed Oshima Tsumugi was studied by color measuring of dyed fabrics by defferent process ("Sharinbai" dyeing, Ca mordanting, Fe mordanting, mud-mordanting, separately). The result was as follows : [table

Possible Phytoremediation of Cadmium Pollution Soil with Kenaf

Kenaf (Hibiscus cannabinus L.), which can grow rapidly and maintain high primary production, was examined for its ability to decontaminate cadmium ions (Cd) from polluted soil. Although its germination and growth were not affected at first, its photosynthesis dependent growth was disturbed by Cd in the soil. No growth after expanding the true leaves was observed at above 111ppm Cd. At 74.1ppm Cd, kenaf could acclimate and began to grow after a few weeks lag. The biomass increased by 2.4 times from 4 to 6 weeks after sawing. Higher accumulation rates were observed in the plant body at below 74.1ppm Cd. The rate increased to 6.4 times in the plant body at 1.48ppm Cd. Assuming the same productions of kenaf as on the soil without Cd, it could decontaminate 1.48ppm Cd from the polluted soil for ca. 16 years and could more efficiently from the soil containing lower concentrations of Cd. These results suggested the possible phytoremediation with kenaf applied to the polluted soil with lower concentrations of Cd

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Mechanism of flame retardation of the mud-mordanting dyed Oshima Tsumugi has been studied by several flammability tests (FF3-71,JIS L 1091 A-4,MAFT, Oxygen index) and SEM observation. The results were as follows : (1) Silk protein : High nitrogen content and low heat of combustion (2) Tannin : Char forming characteristics→suppress flaming combustion (3) Fe, (Ca) : Promoting the carbornization→increase in the char (4) Tannin-Ca-Fe complex : Covering the fiber→form an insulating char on the surface of the fiber→thermal barrier (1)+(2)+(3)+(4)→High flame retardanc

Antigenic Change in Human Influenza A(H2N2) Viruses Detected by Using Human Plasma from Aged and Younger Adult Individuals

Human influenza A(H2N2) viruses emerged in 1957 and were replaced by A(H3N2) viruses in 1968. The antigenicity of human H2N2 viruses has been tested by using ferret antisera or mouse and human monoclonal antibodies. Here, we examined the antigenicity of human H2N2 viruses by using human plasma samples obtained from 50 aged individuals who were born between 1928 and 1933 and from 33 younger adult individuals who were born after 1962. The aged individuals possessed higher neutralization titers against H2N2 viruses isolated in 1957 and 1963 than those against H2N2 viruses isolated in 1968, whereas the younger adults who were born between 1962 and 1968 possessed higher neutralization titers against H2N2 viruses isolated in 1963 than those against other H2N2 viruses. Antigenic cartography revealed the antigenic changes that occurred in human H2N2 viruses during circulation in humans for 11 years, as detected by ferret antisera. These results show that even though aged individuals were likely exposed to more recent H2N2 viruses that are antigenically distinct from the earlier H2N2 viruses, they did not possess high neutralizing antibody titers to the more recent viruses, suggesting immunological imprinting of these individuals with the first H2N2 viruses they encountered and that this immunological imprinting lasts for over 50 years

Heat Shock Factor 1 Contributes to Ischemia-Induced Angiogenesis by Regulating the Mobilization and Recruitment of Bone Marrow Stem/Progenitor Cells

Bone marrow (BM)-derived stem/progenitor cells play an important role in ischemia-induced angiogenesis in cardiovascular diseases. Heat shock factor 1 (HSF1) is known to be induced in response to hypoxia and ischemia. We examined whether HSF1 contributes to ischemia-induced angiogenesis through the mobilization and recruitment of BM-derived stem/progenitor cells using HSF1-knockout (KO) mice. After the induction of ischemia, blood flow and microvessel density in the ischemic hindlimb were significantly lower in the HSF1-KO mice than in the wild-type (WT) mice. The mobilization of BM-derived Sca-1- and c-kit-positive cells in peripheral blood after ischemia was significantly lower in the HSF1-KO mice than in the WT mice. BM stem/progenitor cells from HSF1-KO mice showed a significant decrease in their recruitment to ischemic tissue and in migration, adhesion, and survival when compared with WT mice. Blood flow recovery in the ischemic hindlimb significantly decreased in WT mice receiving BM reconstitution with donor cells from HSF1-KO mice. Conversely, blood flow recovery in the ischemic hindlimb significantly increased in HSF1-KO mice receiving BM reconstitution with donor cells from WT mice. These findings suggest that HSF1 contributes to ischemia-induced angiogenesis by regulating the mobilization and recruitment of BM-derived stem/progenitor cells