Mechanochemical Synthesis of Visible-light Induced Photocatalyst with Nitrogen and Carbon Doping

Nitrogen and/or carbon doped titania photocatalysts were prepared by a novel mechanochemical method. The prepared powders possessed two absorption edges around 400 and 540 nm wavelengths and showed excellent photocatalytic ability for nitrogen monoxide oxidation under visible light irradiation. Under the irradiation of visible light of wavelength >510 nm,37% of nitrogen monoxide could be continuously removed by the carbon and nitrogen co-doped titania prepared by planetary ball milling of P-25 titania–10% hexamethylenetetramine mixture followed by calcination in air at 400-C.

SYNTHESIS OF ORGANOGERMANE OLIGOMERS VIA LIGAND SUBSTITUTION POLYMERIZATION FROM 1, 4-DIOXANE COMPLEX OF GERMANIUM DICHLORIDE

Some organogermanium oligomers with different side groups were synthesized via ligand substitution polymerization from I, l-dioxane complex of germanium dichloride with different organolithium compounds. The oligomers were isolated through either precipitation from methanol or extraction using toluene with a yield of no less than 50%. The weight average molecular weight (M-w) of the oligomers is ranging from 1.4 x 10(3) to 5.9 x 10(3) depending on the type and alkyl length of the organolithium compounds used.

Evaluation of activated area in the electrostatic accelerator facilities

In order to clear the activated area in electrostatic accelerator facilities,four accelerator facilities were selected and typical neutron emission experiments were performed.Neutron flux during operation and induced activity caused by charged particles on the accelerator and its surrounding area after irradiation were measured.Also the monitored neutron flux and calculated value by Monte Carlo calculation using PHITS code were compared.It was confirmed that the results between calculated data and measured data showed the good agreement with each other.Finally,it was concluded that we have to take care the activation of beam line and target.But,it is not necessary to treat accelerator tank,surrounding materials,and building concrete as radioactive materials in case of decommissioning.

Plume-type Ophiolites, Large Igneous Provinces and Geology of the Earth-like Planets

Plume-type is a new branch of ophiolite classification introduced by Dilek and Fumes （2011; GSAB, 123,387-）. Its most typical example is the komatiite-basalt-gabbro- wehrlite assemblage that is exposed on the Gorgona Island off Colombia, South America and is interpreted as a part of the Caribbean large igneous province （LIP）. Analogous rock assemblage occur in the accretionary complexes in the circum-Pacific orogenic belts such as in Japan （Ishiwatari and Ichiyama, 2004; Int.

Effects of Sn^+ Ion Implantation on the Thermoelectric Properties of n-type Lead Telluride

The n-type PbTe doped with 0.05 mol fraction PbI2 was hot-pressed, and the sintered samples were implanted by Sn+ ions at 200 KeV with doses of 6x10(16) and 1x10(17) ions/cm(2). The effect of Sn+ implantation on thermoelectric properties was then investigated. The results show that Sn+ ion implantation can modify thermoelectric properties of the n-type PbTe and greatly improve the dimensionless figure-of-merit.

Preface

Nuclear fuel cycle chemistry is a growing interdisciplinary field that includes radiochemistry, nuclear chemistry, and radiation chemistry. It covers a diverse range of topics in- cluding the basic chemistry of actinides and fission products, nuclear chemistry and radiochemistry related to the nuclear fuel cycle, separation science, and isotope production. As a high-density form of energy that has almost no as- sociated discharge of greenhouse gases, nuclear energy plays a pivotal role in long-term energy security and the prevention of global warming. Although the accident at the Fukushima nuclear power plant has raised intense public concern about the safety of nuclear energy around the world, we believe that nuclear energy is still an inevitable option to ensure energy supply and to reduce carbon emissions in many countries. However, to realize the sustainable devel- opment of nuclear energy in the future it is necessary to maximize uranium resources and minimize radioactive waste. An advanced nuclear fuel cycle can efficiently use uranium resources and reduce the volume and radiotoxicity of nuclear waste, thus greatly contributing to the peaceful use of nuclear power by mankind.

Structural origin of magnetic softening in a Fe-based amorphous alloy upon annealing

The underlying structural origin of magnetic properties is still elusive in Fe-based amorphous alloys.In this study,distinctive soft magnetic properties were developed in Fe_(76)Si_(9)B_(10)P_(5)amorphous ribbons through systematic design of annealing process.Combining with synchrotron radiation,high-resolution transmission electron microscopy and first principle ab initio molecular dynamic simulation,it is found that the atomic structural evolution both in short range order and medium range order is responsible for the magnetic softness at proper annealing temperature.In short range,formation of separated and densely coordinated Fe-metalloid clusters is instigated to adapt energy minimization,resulting in strengthening of ferromagnetic exchange interaction locally.In medium range,a homogeneous exchangecoupling from the uniformly strong and weak ferromagnetic regions is generated,which significantly weakens magnetic heterogeneity and leads to the excellent magnetic softness.Our findings may provide an effective/promising pathway to modulate the magnetic properties for Fe-based amorphous alloys,and give a comprehensive and quantitative understanding of the structure-properties relationship in amorphous materials.