519 research outputs found
Future ground arrays for ultrahigh-energy cosmic rays: recent updates and perspectives
The origin and nature of ultrahigh-energy cosmic rays (UHECRs) are one of the
most intriguing mysteries in particle astrophysics and astronomy. The two
largest observatories, the Pierre Auger Observatory and the Telescope Array
Experiment, are steadily observing UHECRs in both hemispheres in order to
better understand their origin and associated acceleration mechanisms at the
highest energies. We highlight their latest results including on-going
upgrades, AugerPrime and TAx4, and then address the requirements for a
next-generation observatory. We share recent updates and perspectives for a
future ground array of fluorescence detectors, addressing the requirements for
a large-area, low-cost detector suitable for measuring the properties of the
highest energy cosmic rays with an unprecedented aperture.Comment: Invited talk in ISVHECRI 2018, Nagoya, Japa
The Mass Composition of Ultra-high Energy Cosmic Rays Measured by New Fluorescence Detectors in the Telescope Array Experiment
AbstractThe longitudinal development of an extensive air shower reaches its maximum at a depth, Xmax, that depends on the species of the primary cosmic ray. Using a technique based on Xmax, we measure the cosmic-ray mass composition from analyses of 3.7 years of monocular mode operations with the newly constructed fluorescence detectors of the Telescope Array experiment. The Xmax analysis shows our data to be consistent with a proton dominant composition at energies above 1018.0eV
INHIBITION OF TUBULIN-DEPENDENT ADENOSINE TRIPHOSPHATASE (ATPASE) ACTIVITY IN MICROTUBULE PROTEINS FROM PORCINE BRAIN BY COLCHICINE
ArticleJournal of the Faculty of Textile Science and Technology, Shinshu University. Ser. A, Biology 25: 1-7(1986)departmental bulletin pape
Early Rehabilitation with Weight-bearing Standing-shaking-board Exercise in Combination with Electrical Muscle Stimulation after Anterior Cruciate Ligament Reconstruction
The objective of early rehabilitation after anterior cruciate ligament (ACL) reconstruction is to increase the muscle strength of the lower extremities. Closed kinetic chain (CKC) exercise induces co-contraction of the agonist and antagonist muscles. The purpose of this study was to compare the postoperative muscle strength/mass of subjects who performed our new CKC exercise (new rehabilitation
group:group N) from week 4, and subjects who received traditional rehabilitation alone (traditional
rehabilitation group:group T). The subjects stood on the device and maintained balance. Then, low-frequency stimulation waves were applied to 2 points each in the anterior and posterior region of the injured thigh 3 times a week for 3 months. Measurement of muscle strength was performed 4 times (before the start, and then once a month). Muscle mass was evaluated in CT images of the extensor and flexor muscles of 10 knees (10 subjects) in each group. The injured legs of group N showed significant improvement after one month compared to group T. The cross-sectional area of the extensor muscles of the injured legs tended to a show a greater increase at 3 months in group N. This rehabilitation method makes it possible to contract fast-twitch muscles, which may be a useful for improving extensor muscle strength after ACL reconstruction
Revisiting ultrahigh-energy constraints on decaying super-heavy dark matter
We revisit constraints on decaying very heavy dark matter (VHDM) using the
latest ultrahigh-energy cosmic-ray (UHECR; eV) data and
ultrahigh-energy (UHE) -ray flux upper limits, measured by the Pierre
Auger Observatory. We present updated limits on the VHDM lifetime ()
for masses up to ~GeV, considering decay into quarks, leptons, and
massive bosons. In particular, we consider not only the UHECR spectrum but
their composition data that favors heavier nuclei. Such a combined analysis
improves the limits at ~GeV because VHDM decay does not
produce UHECR nuclei. We also show that the constraints from the UHE
-ray upper limits are more stringent for all of the Standard
Model final states we consider.Comment: 9 pages, 5 figure
Chemistry of Cu deposition by Cu(hfac)(tmvs) monitored by LiβΊ ion attachment mass spectrometry
Ion attachment mass spectrometry was used for continuous in situanalysis of coordinated products formed during copperchemical vapor deposition(CuCVD) by Cu(1,1,1,5,5,5-hexafluoroacetylacetonate)(vinyltrimethylsilane) [Cu(hfac)(tmvs)] in a simple tubular reactor. This study of the thermally labile Cu(hfac)(tmvs) demonstrated the utility of this method for detecting molecular ions of labile compounds. The results demonstrate the feasibility of monitoring the deposition chemistry of Cu(hfac)(tmvs) by generating LiβΊ adduct molecular ions by means of the LiβΊ ion attachment technique. The reaction pathways for CuCVD by Cu(hfac)(tmvs) were studied by analysis of the reaction products. H(hfac) and tmvs were identified as the main products when Cu(hfac)tmvs was heated at temperatures ranging from room temperature to 160Β°C in the reactor. The rate constant for Cu deposition, k (1/s), was determined to be 1.6Γ10βΆexp(β10.2kcal/molRt).This work was supported in part by The New Energy and
Industrial Technology Development Organization NEDO
under a fund for Fundamental Technology Research Facilitation
Program
Evaluation and design of function for tracing diffusion of classified information for file operations with KVM
Cases of classified information leakage have become increasingly common. To address this problem, we have developed a function for tracing the diffusion of classified information within an operating system. However, this function suffers from the following two problems: first, in order to introduce the function, the operating system's source code must be modified. Second, there is a risk that the function will be disabled when the operating system is attacked. Thus, we have designed a function for tracing the diffusion of classified information in a guest operating system by using a virtual machine monitor. By using a virtual machine monitor, we can introduce the proposed function in various environments without modifying the operating system's source code. In addition, attacks aimed at the proposed function are made more difficult, because the virtual machine monitor is isolated from the operating system. In this paper, we describe the implementation of the proposed function for file operations and child process creation in the guest operating system with a kernel-based virtual machine. Further, we demonstrate the traceability of diffusing classified information by file operations and child process creation. We also report the logical lines of code required to introduce the proposed function and performance overheads
Unveiling the roles of the glutathione redox system in vivo by analyzing genetically modified mice
Redox status affects various cellular activities, such as proliferation, differentiation, and death. Recent studies suggest pivotal roles of reactive oxygen species not only in pathogenesis under oxidative insult but also in intracellular signal transduction. Glutathione is present in several millimolar concentrations in the cytoplasm and has multiple roles in the regulation of cellular homeostasis. Two enzymes, Ξ³-glutamylcysteine synthetase and glutathione synthetase, constitute the de novo synthesis machinery, while glutathione reductase is involved in the recycling of oxidized glutathione. Multidrug resistant proteins and some other transporters are responsible for exporting oxidized glutathione, glutathione conjugates, and S-nitrosoglutathione. In addition to antioxidation, glutathione is more positively involved in cellular activity via its sulfhydryl moiety of a molecule. Animals in which genes responsible for glutathione metabolism are genetically modified can be used as beneficial and reliable models to elucidate roles of glutathione in vivo. This review article overviews recent progress in works related to genetically modified rodents and advances in the elucidation of glutathione-mediated reactions
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