We are developing a new technique to apply transition-edge sensors (TESs) to X-ray spectroscopy of exotic atoms, especially of kaonic atoms. To demonstrate the feasibility of this pioneering project, ...performance of a TES-based X-ray detector was evaluated in pion- and kaon-beam environments at particle accelerators. We successfully observed X-rays from pionic-carbon atoms with a resolution as good as 7 eV FWHM at 6 keV. Also at a kaon beamline, we confirmed that the TES spectrometer will be able to achieve our resolution goal, 6 eV, in our first scientific campaign to measure X-rays from kaonic-helium atoms.
Using Cd arachidate films formed on Ag and Si substrates, secondary ion intensities were investigated by TOF-SIMS. The intensities of M+H
+, M+Cd
+ and Ag cationized ions from samples on the Ag and ...Si substrates were found to change as a function of LB film thickness, as well as the primary beam energy. The intensities of M+H
+ and M+Cd
+ were seen to be (1) the highest at a one-layer LB film, (2) to decrease as the LB film becomes thicker, (3) change slightly with the primary ion beam energy. On the other hand, the intensities of Ag cationized secondary ions were almost constant with the changes of LB thickness and the energy of the primary ion beam, after normalized by Ag
+ intensity. The results were discussed in terms of the energy transfer of the primary beam to the LB films, the property of the substrate materials, and the strength of chemical bondings.
The impact of large-scale grid-connected photovoltaics (PV) on power system transient stability is discussed in this paper. In response to an increase of PV capacity, the capacity of conventional ...synchronous generator needs to be reduced relatively. This leads to the lower system inertia and the higher generator reactance, and hence the power system transient stability may negatively be affected. In particular, the impact on the transient stability may become more serious when the considerable amounts of PV systems are disconnected simultaneously during voltage sag. In this work, the potential impact of significant PV penetration on the transient stability is assessed by a numerical simulation using PSCAD/EMTDC.
We propose an anomaly detection technique for high-resolution X-ray spectroscopy. The method is based on the neural network architecture variational autoencoder, and requires only {\it normal} ...samples for training. We implement the network using Python taking account of the effect of Poisson statistics carefully, and deonstrate the concept with simulated high-resolution X-ray spectral datasets of one-temperature, two-temperature and non-equilibrium plasma. Our proposed technique would assist scientists in finding important information that would otherwise be missed due to the unmanageable amount of data taken with future X-ray observatories.
The authors proposed the hybrid tuber structure with steel reinforced concrete wall-column and steel beam in order to realize a versatile space in a building. The peripheral frame in this structure ...consists of a steel reinforced concrete wall-column and a peripheral steel beam just embedded to the wall-column, resulting in a rigid connection. In the orthogonal direction of the peripheral frame, a long spanned steel beam is rigidly connected by welding to the H-shaped steel inside the wall-column. This paper investigates the bearing stress transfer mechanism in the in-plane direction of the wall-column. A total number of seven beam-column joint specimens, in half scale of the actual structure, were tested under cyclic loading to simulate the seismic loads. The test parameters include the width and depth, and the embedded length of the steel beam. Based on experimental knowledge, the authors propose the design formula for the structure in terms of the ultimate strength and bearing capacity of concrete.
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