Quantum Beam Science最新文献_第9页

Proton-Cluster-Beam Lethality and Mutagenicity in Bacillus subtilis Spores 枯草芽孢杆菌孢子的质子束致死性和致突变性

IF 1.4

Quantum Beam Science Pub Date : 2021-08-28 DOI: 10.3390/qubs5030025

Y. Hase, K. Satoh, A. Chiba, Y. Hirano, K. Moribayashi, K. Narumi

{"title":"Proton-Cluster-Beam Lethality and Mutagenicity in Bacillus subtilis Spores","authors":"Y. Hase, K. Satoh, A. Chiba, Y. Hirano, K. Moribayashi, K. Narumi","doi":"10.3390/qubs5030025","DOIUrl":"https://doi.org/10.3390/qubs5030025","url":null,"abstract":"The unique energy transfer characteristics of swift cluster ions have attracted the attention of many researchers working on the analysis or processing of material surfaces, but the effects on living organisms remain unclear. We irradiated B. subtilis spores with monomer and cluster proton beams and examined their lethality; the 2 MeV H2+ shows a clearly lower lethality than 340 keV H+, even though both have a comparable linear energy transfer. The 2 MeV H2+ dissociates into a pair of 1 MeV H+ by losing the bonding electrons at the target surface. The estimated internuclear distance and the radial dose distribution suggest that the spread of deposited total energy over two areas separated by just several nanometers greatly diminishes beam lethality and that the energy density in the very center of the trajectory, possibly within a 1 nm radius, has a great impact on lethality. We also performed a whole genome resequencing of the surviving colonies to compare the molecular nature of mutations but failed to find a clear difference in overall characteristics. Our results suggest that cluster beams may be a useful tool for understanding biological effects of high linear energy transfer radiation.","PeriodicalId":31879,"journal":{"name":"Quantum Beam Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48855981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Erratum: Cureton et al. Review of Swift Heavy Ion Irradiation Effects in CeO2. Quantum Beam Sci. 2021, 5, 19 勘误:柯顿等人。快速重离子辐照在CeO2中的研究进展。量子光束科学，2021,5,19

IF 1.4

Quantum Beam Science Pub Date : 2021-08-06 DOI: 10.3390/qubs5030024

W. Cureton, C. Tracy, M. Lang

引用次数: 0

Control and Modification of Nanostructured Materials by Electron Beam Irradiation 电子束辐照对纳米结构材料的控制与改性

IF 1.4

Quantum Beam Science Pub Date : 2021-07-21 DOI: 10.3390/QUBS5030023

S. Tanaka

{"title":"Control and Modification of Nanostructured Materials by Electron Beam Irradiation","authors":"S. Tanaka","doi":"10.3390/QUBS5030023","DOIUrl":"https://doi.org/10.3390/QUBS5030023","url":null,"abstract":"I have proposed a bottom-up technology utilising irradiation with active beams, such as electrons and ions, to achieve nanostructures with a size of 3–40 nm. This can be used as a nanotechnology that provides the desired structures, materials, and phases at desired positions. Electron beam irradiation of metastable θ-Al2O3, more than 1019 e/cm2s in a transmission electron microscope (TEM), enables the production of oxide-free Al nanoparticles, which can be manipulated to undergo migration, bonding, rotation, revolution, and embedding. The manipulations are facilitated by momentum transfer from electrons to nanoparticles, which takes advantage of the spiral trajectory of the electron beam in the magnetic field of the TEM pole piece. Furthermore, onion-like fullerenes and intercalated structures on amorphous carbon films are induced through catalytic reactions. δ-, θ-Al2O3 ball/wire hybrid nanostructures were obtained in a short time using an electron irradiation flashing mode that switches between 1019 and 1022 e/cm2s. Various α-Al2O3 nanostructures, such as encapsulated nanoballs or nanorods, are also produced. In addition, the preparation or control of Pt, W, and Cu nanoparticles can be achieved by electron beam irradiation with a higher intensity.","PeriodicalId":31879,"journal":{"name":"Quantum Beam Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3390/QUBS5030023","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45938191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Validation of a Sapphire Gas-Pressure Cell for Real-Time In Situ Neutron Diffraction Studies of Hydrogenation Reactions 蓝宝石气体压力电池用于氢化反应实时原位中子衍射研究的验证

IF 1.4

Quantum Beam Science Pub Date : 2021-07-15 DOI: 10.3390/QUBS5030022

R. Finger, T. Hansen, H. Kohlmann

引用次数: 2

Fabrication of Size- and Shape-Controlled Platinum Cones by Ion-Track Etching and Electrodeposition Techniques for Electrocatalytic Applications 用离子轨迹蚀刻和电沉积技术制备尺寸和形状可控的铂锥，用于电催化应用

IF 1.4

Quantum Beam Science Pub Date : 2021-07-01 DOI: 10.3390/QUBS5030021

Yuma Sato, H. Koshikawa, S. Yamamoto, M. Sugimoto, S. Sawada, T. Yamaki

{"title":"Fabrication of Size- and Shape-Controlled Platinum Cones by Ion-Track Etching and Electrodeposition Techniques for Electrocatalytic Applications","authors":"Yuma Sato, H. Koshikawa, S. Yamamoto, M. Sugimoto, S. Sawada, T. Yamaki","doi":"10.3390/QUBS5030021","DOIUrl":"https://doi.org/10.3390/QUBS5030021","url":null,"abstract":"The micro/nanocone structures of noble metals play a critical role as heterogeneous electrocatalysts that provide excellent activity. We successfully fabricated platinum cones by electrodeposition using non-penetrated porous membranes as templates. This method involved the preparation of template membranes by the swift-heavy-ion irradiation of commercially available polycarbonate films and subsequent chemical etching in an aqueous NaOH solution. The surface diameter, depth, aspect ratio and cone angle of the resulting conical pores were controlled in the ranges of approximately 70–1500 nm, 0.7–11 μm, 4–12 and 5–13°, respectively, by varying the etching conditions, which finally produced size- and shape-controlled platinum cones with nanotips. In order to demonstrate the electrocatalytic activity, electrochemical measurements were performed for the ethanol oxidation reaction. The oxidation activity was found to be up to 3.2 times higher for the platinum cone arrays than for the platinum plate. Ion-track etching combined with electrodeposition has the potential to be an effective method for the fabrication of micro/nanocones with high electrocatalytic performance.","PeriodicalId":31879,"journal":{"name":"Quantum Beam Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3390/QUBS5030021","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42276621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Phase Transformation by 100 keV Electron Irradiation in Partially Stabilized Zirconia 部分稳定氧化锆的100 keV电子辐照相变

IF 1.4

Quantum Beam Science Pub Date : 2021-06-25 DOI: 10.3390/qubs5030020

Y. Okuno, N. Okubo

{"title":"Phase Transformation by 100 keV Electron Irradiation in Partially Stabilized Zirconia","authors":"Y. Okuno, N. Okubo","doi":"10.3390/qubs5030020","DOIUrl":"https://doi.org/10.3390/qubs5030020","url":null,"abstract":"Partially stabilized zirconia (PSZ) is considered for use as an oxygen-sensor material in liquid lead-bismuth eutectic (LBE) alloys in the radiation environment of an acceleration-driven system (ADS). To predict its lifetime for operating in an ADS, the effects of radiation on the PSZ were clarified in this study. A tetragonal PSZ was irradiated with 100 keV electrons and analyzed by X-ray diffraction (XRD). The results indicate that the phase transition in the PSZ, from the tetragonal to the monoclinic phase, was caused after the irradiation. The deposition energy of the lattice and the deposition energy for the displacement damage of a 100 keV electron in the PSZ are estimated using the particle and heavy ion transport code system and the non-ionizing energy loss, respectively. The results suggest that conventional radiation effects, such as stopping power, are not the main mechanism behind the phase transition. The phase transition is known to be caused by the low-temperature degradation of the PSZ and is attributed to the shift of oxygen ions to oxygen sites. When the electron beam is incident to the material, the kinetic energy deposition and excitation-related processes are caused, and it is suggested to be a factor of the phase transition.","PeriodicalId":31879,"journal":{"name":"Quantum Beam Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3390/qubs5030020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44835014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Review of Swift Heavy Ion Irradiation Effects in CeO2 快速重离子辐照在CeO2中的研究进展

IF 1.4

Quantum Beam Science Pub Date : 2021-06-16 DOI: 10.3390/QUBS5020019

W. Cureton, C. Tracy, M. Lang

{"title":"Review of Swift Heavy Ion Irradiation Effects in CeO2","authors":"W. Cureton, C. Tracy, M. Lang","doi":"10.3390/QUBS5020019","DOIUrl":"https://doi.org/10.3390/QUBS5020019","url":null,"abstract":"Cerium dioxide (CeO2) exhibits complex behavior when irradiated with swift heavy ions. Modifications to this material originate from the production of atomic-scale defects, which accumulate and induce changes to the microstructure, chemistry, and material properties. As such, characterizing its radiation response requires a wide range of complementary characterization techniques to elucidate the defect formation and stability over multiple length scales, such as X-ray and neutron scattering, optical spectroscopy, and electron microscopy. In this article, recent experimental efforts are reviewed in order to holistically assess the current understanding and knowledge gaps regarding the underlying physical mechanisms that dictate the response of CeO2 and related materials to irradiation with swift heavy ions. The recent application of novel experimental techniques has provided additional insight into the structural and chemical behavior of irradiation-induced defects, from the local, atomic-scale arrangement to the long-range structure. However, future work must carefully account for the influence of experimental conditions, with respect to both sample properties (e.g., grain size and impurity content) and ion-beam parameters (e.g., ion mass and energy), to facilitate a more direct comparison of experimental results.","PeriodicalId":31879,"journal":{"name":"Quantum Beam Science","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2021-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3390/QUBS5020019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44574558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Effect of 1.5 MeV Proton Irradiation on Superconductivity in FeSe0.5Te0.5 Thin Films 1.5MeV质子辐照对FeSe0.5Te0.5薄膜超导性的影响

IF 1.4

Quantum Beam Science Pub Date : 2021-06-04 DOI: 10.3390/QUBS5020018

T. Ozaki, Takuya Kashihara, I. Kakeya, R. Ishigami

引用次数: 2

Internal Strain Distribution of Laser Lap Joints in Steel under Loading Studied by High-Energy Synchrotron Radiation X-rays 高能同步辐射X射线研究激光搭接接头在载荷作用下的内部应变分布

IF 1.4

Quantum Beam Science Pub Date : 2021-06-02 DOI: 10.3390/QUBS5020017

T. Shobu, A. Shiro, Fumiaki Kono, T. Muramatsu, Tomonori Yamada, M. Naganuma, T. Ozawa

引用次数: 1

Modification of Critical Current Density Anisotropy in High-Tc Superconductors by Using Heavy-Ion Irradiations 重离子辐照对高温超导体临界电流密度各向异性的影响

IF 1.4

Quantum Beam Science Pub Date : 2021-05-21 DOI: 10.3390/QUBS5020016

T. Sueyoshi

{"title":"Modification of Critical Current Density Anisotropy in High-Tc Superconductors by Using Heavy-Ion Irradiations","authors":"T. Sueyoshi","doi":"10.3390/QUBS5020016","DOIUrl":"https://doi.org/10.3390/QUBS5020016","url":null,"abstract":"The critical current density Jc, which is a maximum value of zero-resistivity current density, is required to exhibit not only larger value but also lower anisotropy in a magnetic field B for applications of high-Tc superconductors. Heavy-ion irradiation introduces nanometer-scale irradiation tracks, i.e., columnar defects (CDs) into high-Tc superconducting materials, which can modify both the absolute value and the anisotropy of Jc in a controlled manner: the unique structures of CDs, which significantly affect the Jc properties, are engineered by adjusting the irradiation conditions such as the irradiation energy and the incident direction. This paper reviews the modifications of the Jc anisotropy in high-Tc superconductors using CDs installed by heavy-ion irradiations. The direction-dispersion of CDs, which is tuned by the combination of the plural irradiation directions, can provide a variety of the magnetic field angular variations of Jc in high-Tc superconductors: CDs crossing at ±θi relative to the c-axis of YBa2Cu3Oy films induce a broad peak of Jc centered at B || c for θi < ±45°, whereas the crossing angle of θi ≥ ±45° cause not a Jc peak centered at B || c but two peaks of Jc at the irradiation angles. The anisotropy of Jc can also modified by tuning the continuity of CDs: short segmented CDs formed by heavy-ion irradiation with relatively low energy are more effective to improve Jc in a wide magnetic field angular region. The modifications of the Jc anisotropy are discussed on the basis of both structures of CDs and flux line structures depending on the magnetic field directions.","PeriodicalId":31879,"journal":{"name":"Quantum Beam Science","volume":"5 1","pages":"16"},"PeriodicalIF":1.4,"publicationDate":"2021-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3390/QUBS5020016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46335546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11