Experimental research on the Stirling engine

Experiments on Stirling engines of the 50 KW class were conducted to clarify the characteristics of the engine and its problems. The problems involve durability of the high temperature heat exchanger which is exposed to high flame temperatures above 1600 C, thermal distortion and high temperature corrosion of the devices near combustion, and of the preheater

The relationship between childhood aerobic fitness and brain functional connectivity

AbstractSeveral studies have indicated that higher levels of childhood aerobic fitness is associated with superior cognitive function, and this association is disproportionately observed in tasks requiring greater top-down control. We designed the current study to clarify the relationship between childhood fitness and top-down control in terms of functional connectivity among brain regions, by evaluating phase-locking values (PLVs), which is a measure of frequency-specific phase synchrony between electroencephalographic signals during a visual search task. Lower-fit and higher-fit children performed a visual search task that included feature search and conjunction search conditions. The conjunction search condition required greater top-down control to reduce interference from task-irrelevant distractors that shared a basic feature with the target. Results indicated that higher-fit children exhibited higher response accuracy relative to lower-fit children across search conditions. The results of PLVs showed that higher-fit children had greater functional connectivity for the conjunction relative to the feature search condition, whereas lower-fit children showed no difference in functional connectivity between search conditions. Furthermore, PLVs showed different time courses between groups; that is, higher-fit children sustained upregulation of top-down control throughout the task period, whereas lower-fit children transiently upregulated top-down control after stimulus onset and could not sustain the upregulation. These findings suggest that higher levels of childhood aerobic fitness is related to brain functional connectivity involved in the sustained upregulation of top-down control

Reexamination of Mocs and Tauti chondritic meteorites: Classification with shock degree

The Mocs meteorite, which fell on February 3,1882,in Transylvania over a large area (15km by 3km) has been reclassified from a L6 to a L5-6 chondrite in this study. Six fragments of the Mocs chondrite were observed by optical microscopy and measured using electron microprobe analyses and standard wet chemical analysis. Although the petrologic type of the 6 samples is almost the same, 2 fragments : Mocs-1 and Mocs-3 show heterogeneous features (opaque shock veins and melt pockets) due to different shock degrees (S-5 and S-4,respectively). Therefore the mean shock degree of the Mocs chondrite was found to be S3-5. The Tauti meteorite which fell in 1937 in Transylvania was previously classified as L6 chondrite using the bulk chemical analyses of H. SAVU (St. Cerc. Geol., 2 (IV), 272,1959) (A. L. GRAHAM; Meteoritics, 14,1,1979; A. L. GRAHAM et al.; Catalogue of Meteorites, London, British Museum, Natural History, 1985). The chemical compositions of olivines and orthopyroxenes determined by electron microprobe analysis, the bulk chemical analysis, along with textural characteristics classify Tauti shower as L6 chondrite with a shock degree of S-3

Bulk composition and classification of the Tahara meteorite fell in Central Japan on March 1991

The Tahara meteorite which fell on March 26,1991 on a ship\u27s deck anchored at Tahara, Aichi-ken, Japan was found at Matsue-shi, Shimaneken on December 28,1992. It has been classified as an H4-5 chondrite using optical and electron microscopy and bulk chemical analysis. This equilibrated chondrite is completely different from the Mihonoseki L chondrite which fell on December 10,1992 in the same area of Japan, Shimane-ken. The retrieval process of new Japanese meteorites is similar to Antarctic meteorites of different origins which are collected in the same area

Bulk chemical compositions of meteorites in the NIPR collection

第6回極域科学シンポジウム[OA] 南極隕石11月16日（月）　国立極地研究所１階交流アトリウ

La agenda setting en la construcción del candidato: casos de Ricardo Belmont y Renzo Reggiardo en la elecciones municipales 2018

La agenda setting es un concepto definido por Gómez (2009) como el poder de los medios de comunicación para atraer la atención hacia ciertos temas y al mismo tiempo crear los marcos de interpretación de los acontecimientos sociales. Por lo que, dado el contexto electoral, nos pareció de suma importancia analizar su uso mediante el caso específico de dos candidatos que fueron parte de las elecciones municipales para Lima, Perú en el 2018. El primer candidato que analizaremos será Ricardo Belmont, el cual tuvo un despliegue notable a través de las redes sociales usando la agenda setting hablando sobre la inmigración venezolana al país. El otro caso es de Renzo Reggiardo que usó la agenda setting mediante el tema de la inseguridad ciudadana a través de la señal abierta de la televisión peruana. Lo anterior impulsó a ambos candidatos, en la primera fase de las elecciones, como los favoritos de las encuestas solo por el uso de la agenda

Comparative study on the major element chemical compositions of Antarctic chondrites to those of non-Antarctic falls with reference to terrestrial weathering

Antarctic ordinary chondrites contain variable amounts of Fe_2O_3 and water as terrestrial weathering products. The Fe_2O_3 contents have a positive correlation with water contents, and a negative correlation with metallic Fe. Therefore, oxygen and water were added to Antarctic chondrites during weathering to form limonitic alteration from metallic iron. Other major elements and total Fe slightly decrease with increasing Fe_2O_3. This decrease is caused by the "dilution" effect due to additional water and oxygen, suggesting that most of the Antarctic chondrites seem to have undergone terrestrial weathering in a quasi-closed system insofar as major elements are concerned. Weathering index has minimal or no relation with the Fe_2O_3 contents of chondrites. Extensive weathering obscures petrographic features of some chondrites, leading to the misclassification, and they are revised on the basis of UC diagram. The major element compositions of Antarctic ordinary chondrites are the same as those of non-Antarctic falls, and they show slight difference in Mg and Na contents among H, L, and LL chondrites; H chondrites have the highest Mg/Si ratio and the lowest Na/Si ratio on average. Some LL chondrite breccias have higher K contents than non-brecciated LL chondrites

Age‐related differences in kinematics and kinetics of sprinting in young female

This study aimed to investigate the age‐related differences in sprinting performance, kinematic and kinetic variables in girls aged between 7.0 to 15.3 years. Step‐to‐step spatiotemporal variables and ground reaction impulses during sprinting were collected in 94 Japanese girls across a 50 m in‐ground force plate. From the results, a difference in rate of development in sprinting performance in girls over 12.7 years compared with younger girls (YG) was observed. The older girls (OG) became slightly slower each year (−0.09 m/s/year) compared to the YG (0.24 m/s/year) who increased their running speed. Moreover, height increased by 6.3 cm/year in YG and only 3.6 cm/year in OG, while step length during the maximal speed phase increased by 0.07 m/year in YG and plateaued in OG (0.01 m/year). Propulsive impulse during the initial acceleration phase was the only kinetic variable to differ in rate of development between the age groups with an increase of 0.024 Ns/year in the YG compared to −0.010 Ns/year in OG. The development of sprinting ability in Japanese girls was more rapid before age 12.7 years. The difference in rate of development in sprinting ability can be primarily attributed to greater growth rates in YG, contributing to increases in the propulsive impulse during the initial acceleration phase and step length during the maximal speed phase. The limited gains in step length and the propulsive impulse in OG may reflect their reduced growth rate in height and the fact that increases in fat mass with maturation impaired relative force production