45 research outputs found
Photoluminescence Enhancement of β-FeSi2 Nanocrystals Controlled by Transport of Holes in Cu-doped n-type Si Substrates
We have investigated PL behavior of β-FeSi2 nanocrystals controlled by transport of holes in Cu-doped n-type Si substrates. PL enhancement was observed and PCI-PL measurements revealed that PL enhancement was attributed to a transport process of holes with a larger time constant in Cu-doped n-Si substrate in which an interval trap process is controlled by Cu doping.International Conference and Summer School on Advanced Silicide Technology 2014, July 19–21, 2014, Tokyo, Japa
Enhancement of Photoluminescence from Cu-doped β-FeSi2/Si Heterostructures
We have investigated photoluminescence (PL) behaviors of the Cu-doped β-FeSi2 thin film/Si heterostructure. Pronounced enhancement of an intrinsic A band and an impurity-related C band emissions has been observed in all the Cu-doped samples. The photo-carrier injection (PCI)-PL measurements have revealed that the PL enhancement is attributed to dynamic process of migration of holes where a repeated trap process of holes can be controlled by Cu-doping.International Conference and Summer School on Advanced Silicide Technology 2014, July 19–21, 2014, Tokyo, Japa
医療用・一般用漢方製剤の情報の比較検討:葛根湯
[Purpose] Kampo medicine is widely used in Japan. Although traditional Kampo medicines were used through the decoction and combination of constituent crude drugs, powdered preparations such as extract granules are often used for the sake of simplicity. Kakkonto is a decoction made of seven kinds of crude drugs, including Kakkon. Many Kakkonto preparations exist for both prescription drugs and over-the-counter (OTC) drugs in Japan and are often prescribed by doctors. Furthermore, Kakkonto is well-known by citizens and used frequently as a general purpose medicine. Therefore, in this research, we aimed to compare prescription contents and formulations of Kakkonto in prescription and OTC drugs existing in Japan and identify differences.[Method] We searched for “Kakkonto” on the website of the Pharmaceuticals and Medical Devices Agency and obtained a package insert.[Result] As a result of our search of “Kakkonto,” we found 14 and 127 items for prescription and OTC drugs, respectively. For prescription drugs, 11 items were one of four prescriptions prescribed in the Japanese Pharmacopoeia, and the other item referred to Keishi instead of Keihi. The dosage was one time for all items. For OTC drugs, everything was one of the four prescriptions, but the dosage was 1/3 to 1 times the dose. As for formulations, 12 were in the form of powders and two were in tablet form for prescription drugs. For OTC drugs, 62 were formulated as powders, 13 as tablets, 48 as liquids, and four as decoctions. Many kinds of additives were used; even products by the same company included different additives, though dosage levels were often the same.[Conclusion] Kakkonto in prescription and OTC drugs had a wide range of herbal composition ratios and amounts thereof. Pharmacists should be aware of such differences and appropriately provide information to medical staffs, patients, and general consumers.論
Fluence enhancement of a 4 MeV‐C4+ ion beam transmitted through a cylindrical glass channel after charging
Fluence enhancement of a 4 MeV‐C4+ ion beam transmitted through a cylindrical glass channel after charging
一対の凸面と凹面で構成される円筒形ガラスチャネル(CGC)を通過するイオンビームによって誘起される表面の帯電がイオンの運動に与える効果について研究を行った。実験では、4MeV C4+イオンビームがCGCを通過する際、その前後でのイオン数をCR-39固体核飛跡検出器で、またイオンのエネルギーをシリコン半導体検出器で測定した。その結果、CGCを通過してもイオンのエネルギーは変化せず、表面の帯電後のフルエンス比(出射イオンビーム/入射イオンビーム)が増加することがわかった。 さらに、イオン通過の幾何学的限界を超えた1.5°のCGCの傾斜角に対して、帯電後に凹面近くを通過するイオンのフルエンス比は1を超えることも確認した。これらより、今回用いたCGCはイオンのエネルギーを変えることなく、イオンビームを偏向や集束できることがわかった
Development of a highly-intense negative C60 ion source for a tandem accelerator and its applications
A Comparative Study on Lethal Effect of Monomer and Cluster Proton Ion Beams in Bacterial Spores
Novel Approaches for Intensifying Negative C60 Ion Beams Using Conventional Ion Sources Installed on a Tandem Accelerator
A Comparative Study on Lethal Effect of Monomer and Cluster Proton Ion Beams in Bacterial Spores
クラスターイオンは、複数の原子がnm距離に近接した状態で物質に入射することから、材料表面の改質や分析では単原子イオンに比べて特異なエネルギー付与を示すことが知られている。しかしながら、生物試料における研究は実施されていなかった。我々は、枯草菌の胞子を生物試料のモデルとし、クラスターイオンの生物効果の特徴について明らかにすることを目的とした研究を行っている。原子あたり2MeVの炭素イオンの致死効果を評価した結果、LETが非常に高いために1原子のヒットで致死するため、致死効果に関するクラスター化の効果は確認されないことがわかった。そこで、炭素よりも低いLETを持つプロトンのクラスターイオンの致死効果を評価した。2 MeV H2は1MeV Hに比べて原子あたりの致死効果が低く、負のクラスター効果を示す可能性が示唆された。これは、2つのプロトンが近接して通過するために、同じ遺伝子に影響する確率が高いことによると解釈できる。340 keV Hは2MeV H2と粒子あたりで同じLETを持つが、致死効果は340 keV Hの方が明らかに高かった。これは、イオントラック中心付近でのエネルギー密度が致死効果に大きく影響することによると考えられる
Development of a highly-intense negative C60 ion source for a tandem accelerator and its applications
高崎量子応用研究所イオン照射研究施設(TIARA)におけるMeV級C60イオンビームを安定に利用するための、タンデム加速器用の負イオン源の開発について報告した。次にこのイオン源開発により可能になった研究として、MeV級C60イオンビーム照射を利用した、金のスパッタリング収量の測定をはじめとしたいくつかの成果を紹介した。23rd International Workshop on Inelastic Ion-Surface Collisions (IISC-23