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[en] This summarizes the talk given at the LCWS 2019 conference in Sendai, Japan, on the progress of the WHIZARD event generator in terms of new physics features and technical improvements relevant for the physics programme of future lepton and especially linear colliders. It takes as a reference the version 2.8.2 released in October 2019, and also takes into account the development until version 2.8.3 to be released in February 2020.
[en] The present global concern is on the adverse effect due to exposure to nuclides expelled from the disrupted nuclear power plant accident in Japan. The exposure can induce several adverse effects. In this specific brief review, the author summarizes the evidences on the effect on liver. Discussion is focused on several liver diseases
[en] Neonicotinoids and fipronil are the most widely used insecticides in the world. Previous studies showed that these compounds have high toxicity to a wide taxonomic range of non-target invertebrates. In rice cultivation, they are frequently used for nursery-box treatment of rice seedlings. The use of fipronil and neonicotinoid imidacloprid is suspected to be the main cause of population declines of red dragonflies, in particular Sympetrum frequens, because they have high lethal toxicity to dragonfly nymphs and the timing of the insecticides’ introduction in Japan (i.e., the late 1990s) overlapped with the sharp population declines. However, a causal link between application of these insecticides and population declines of the dragonflies remains unclear. Therefore, we estimated the amount of the insecticides applied for nursery-box treatment of rice seedlings and analyzed currently available information to evaluate the causality between fipronil and imidacloprid usage and population decline of S. frequens using Hill’s causality criteria. Based on our scoring of Hill’s nine criteria, the strongest lines of evidence were strength, plausibility, and coherence, whereas the weakest were temporality and biological gradient. We conclude that the use of these insecticides, particularly fipronil, was a major cause of the declines of S. frequens in Japan in the 1990s, with a high degree of certainty. The existing information and our analyses, however, do not allow us to exclude the possibility that some agronomic practices (e.g., midsummer drainage or crop rotation) that can severely limit the survival of aquatic nymphs also played a role in the dragonfly’s decline.
[en] The accelerator-based neutrino experiment Tokai-to-Kamioka (T2K) in Japan ran in the neutrino mode since 2010 and then switched to the antineutrino mode in 2014. The initial results of the data analysis obtained with antineutrinos are reported here.
[en] By reflecting the lessons learned from the accident of TEPCO's Fukushima-Daiichi Nuclear Power Plant which occurred on 11. March 2011, the new regulation body, Nuclear Regulation Authority (NRA), Japan has formulated the new regulatory requirements for the nuclear facilities. The feature of new regulatory requirements for the nuclear fuel facilities, such as fuel fabrication facilities and reprocessing facilities, are introduced in comparisons with the former requirements, focusing on the criticality safety issues. In addition, the present status of the safety review of nuclear fuel facilities under the new regulatory requirements is presented. (author)
[en] This study aims to determine a baseline for natural soil carbon dioxide (CO2) flux at the surface based on long-term field measurements, with the ultimate purpose to detect the gas leakage at CO2 geological storage sites. CO2 surface monitoring is a tool that measures the safety and effectiveness of CO2 capture and storage (CCS), a technology which is believed to be a reliable approach to mitigate the CO2 emission. However, the fluctuations of naturally occurring CO2 in soil layers complicate the leakage detection as the soil connects both the underground layers and the atmosphere. In this regard, this study not only investigates the natural surface CO2 flux behavior but also develops an equation to estimate the surface CO2 flux with respect to the soil moisture content and temperature. To meet this end, two values within the CO2 flux equation were defined and calculated based on the field measurements; a, representing a water saturation–dependent value, and b, representing the temperature sensitivity (independent of the water saturation). The results show a good agreement between estimated and measured data. Upon which, the maximum baseline for surface CO2 flux was derived and used as a threshold to detect the potential CO2 leakage in the candidate field (INAS, Japan).
[en] Automatic translation: As part of the 1974 between the Federal Republic of Germany and Japan concluded cooperation agreement on the Science and Technology Area was formed in 1979 Working agreement between Kernforschungsanlage Jülich GmbH (KFA) and the Japan Atomic Energy Research Institute (JAERI) on the Field of research and development of high temperature reactors completed. The subject of the contract was the promotion of HTR development in both countries up to the conclusion of commercial contracts between the Japanese and German HTR industries involved. The contract saw the delegation of one Scientist as ''Resident Officer'' at the research facility of the contractual partner. After the o.a. KFA-JAERI cooperation agreement entered into an agreement between KFA in February and JAERI on the exchange of information in the field of research and development of high temperature reactors in force, the takes into account the different status of HTR development in the Federal Republic of Germany and Japan.
[de]Im Rahmen des 1974 zwischen der Bundesrepublik Deutschland und Japan abgeschlossenen Abkommens über die Zusammenarbeit auf dem Gebiet ''Wissenschaft und Technologie'' wurde 1979 ein Zusammenar beitsabkommen zwischen der Kernforschungsanlage Jülich GmbH (KFA) und dem Japan Atomic Energy Research Institute (JAERI) auf dem Gebiet der Forschung und Entwicklung von Hochtemperaturreaktoren abgeschlossen. Gegenstand des Vertrages war die Förderung der HTR-Entwicklung in beiden Ländern bis hin zum Abschluß kommerzieller Verträge zwischen der beteiligten japanischen und bundes deutschen HTR-Industrie. Der Vertrag sah die Abordnung eines Wissenschaftlers als ''Resident Officer'' an die Forschungsanlage des Vertragspartners vor. Nach Auslaufen des o.a. KFA-JAERI-Zusammenarbeitsabkommens trat im Februar ein Abkommen zwischen KFA und JAERI über den Informationsaustausch auf dem Gebiet der For schung und Entwicklung von Hochtemperaturreaktoren in Kraft, das den unterschiedlichen Stand der HTR-Entwicklung in der Bundesrepublik Deutschland und Japan Rechnung trägt.
[en] A cleaning method using a laser ablation technology is widely used in various industries such as automobile, aviation, and semiconductor industries. Recently, applying this technology to decontamination works has been receiving attention as a useful and effective decontamination method. The laser decontamination method allows for decreasing a generation of secondary radioactive waste because materials like abrasive and water are not required. This is one of big advantages in use for decontamination works. Additionally, the system is compact and requires less than 100 W electric power. These features provide a low running cost. Remote operation obviously plays an important role in terms of a dose reduction in highly-radioactive and contaminated environment. The laser decontamination method is also suitable for remote works using manipulators as the laser head is light and compact, and a reaction force during operation is small, compared to the other types of decontamination tools. This paper provides an outline and a capability of the remote laser decontamination system developed by IHI Corporation (IHI) with some results of component tests for this system. (authors)
[en] Nuclear power generating capacity in Japan (mainly based on light water moderated concepts) is projected to be 6 000 MWe in 1975 and 30 - 40 000 MWe in 1985. This poses two main problems: (a) Fuel requirement will be 13 000 tonnes of U3O8 by 1975 (cumulative). (b) Cumulative Pu production will be 3 tonnes by 1975 and 15 tonnes by 1980.
[en] For a better understanding of possible physical links between geophysical observables and earthquake characteristics, it is important to analyze statistical spatiotemporal patterns in nature related to such events. For this purpose, characteristic changes in groundwater level (GWL) were observed before and after the 2016 Kumamoto earthquake in Japan. Previous research has shown that self-organizing maps (SOM) can be used to classify complex patterns of GWL-change during different parts of the earthquake sequence. In this study, we used before and after earthquake GWL data as input vectors to SOM. In total, 64 observed GWLs were classified into 12 different clusters. Most shallow wells displayed GWL difference that was small during the foreshock (first earthquake) and large during the main-shock (second earthquake). Upstream deep wells showed relatively large difference in water level from 1 to 2 days after the earthquakes. The GWL rapidly increased just after the earthquake, then tended to gradually decrease from September. Most of the shallow wells in the unconfined aquifer rapidly recovered to initial GWLs within several hours to several days, because of hydrostatic pressure. However, most of the deep wells in the confined aquifer needed longer time to recover, in some cases several weeks to several months. These findings are important for the physical understanding of earthquake effects on the groundwater environment, disaster prevention, and possibility for development of earthquake precursors.