Two Species of Koellikerina Medusae (Cnidaria, Hydrozoa, Anthomedusae) from Japan

We fully described two Koellikerina species from shallow waters in Japan with illustrations and photographs. Koellikerina constricta (Menon, 1932), bearing characteristic bell constriction, expands its distribution to Kuchinoerabu Island, Kagoshima Prefecture (northern limit). Koellikerina bouilloni n. sp. is added to eight known species of the genus Koellikerina on the basis of an absence of bell constriction, a colorless body, and the presence of adaxial ocelli, perradial gonads, and a peduncle by examining a specimen from Tanabe Bay, Wakayama Prefecture and 18 specimens formerly collected from Papua New Guinea. Although bell constriction has been criticized as a taxonomic character, we conclude that it is reliable among Koellikerina because all the K. bouilloni specimens at variable developmental stages lack bell constriction and are clearly distinguishable from K. constricta

Current status on pair-produced muon-philic vectorlike leptons in multilepton channels at the LHC

In this work, we obtain the current limits on the pair production of vectorlike leptons decaying to a Standard Model gauge boson and a lepton in the second generation using the Run-2 data at the LHC. Since there is no dedicated search, we recast the ATLAS analyses searching for the type-III seesaw heavy leptons in the multi-lepton channels. There is no limit for the $SU(2)_L$ singlet vectorlike lepton beyond about 100 GeV, while the limit is about 780 GeV for the doublet one. Thus, dedicated searches for the vectorlike leptons are necessary, especially for the singlet one. We also study the general cases of the vectorlike lepton decays and future sensitivities the HL-LHC.Comment: 8 pages, 4 figure

Monitoring Foraging Behavior in Ruminants in a Diverse Pasture

Symposium mini revie

The relationship between fine rings in the statolith and growth of the cubomedusa Chiropsalmus quadrigatus (Cnidaria: Cubozoa) from Okinawa Island, Japan

Sixty-nine Chiropsalmus quadrigatus medusae were collected from Okinawa Island, Japan, in June-August 2000. The bell height ranged from 2.5 to 97.6 mm. The numbers of fine rings on polished statoliths were counted, and the coefficient of variation for the within-individual counts for the four statoliths was 3.3± 1.9% (mean::tSD, n=17). The slope of the linear regression of the number of rings against collecting date in 61 medusae was near 1.0, suggesting that the statolith rings are daily increments. The relationship between bell height and number of rings fitted a logistic growth curve. And, the relationship between statolith length and number of rings fitted the Gompertz growth curve. A check ring was present at a position of 5-10 rings from the center of each statolith. The backcalculated dates of check ring formation dated mainly from early to mid June, suggesting that the polyp of C. quadrigatus finished the metamorphosis to medusa and the medusa was liberated from a substratum during this period

A Study on High Efficiency Wing-vane Compressor - Part.3: Experimental Evaluation of the Prototype -

Low global warming refrigerants such as HFO (hydro fluoro olefin) -1234yf are attracted as an alternative working fluid in air-conditioning and cooling systems to address global warming. However, it used to require larger compressor size due to the lower fluid density compared with conventional refrigerants such as R410A. Thus, a new wing-vane compressor which has no contraction between the vane and the cylinder is developed to prevent increase in the size without performance degradation. The structure of the wing-vane compressor is different from the conventional vane compressor. Therefore, a prototype of the wing-vane compressor was operated using R134a refrigerant to simulate HFO-1234yf refrigerant. The results are as follows: (1) The steady operation is observed in the general operating condition. (2) The steady mechanism of vane is clarified by both experiment and simulation. (3) A simple lubrication structure is achieved by supplying the oil to the friction surface through the grooves with the partial arc guide bearings

A Study on High Efficiency Wing-Vane Compressor - Part.2: Lubrication Characteristic of The Partial Arc Guide Bearing -

Low global warming refrigerants such as HFO (hydro fluoro olefin) -1234yf are attracted as an alternative working fluid in air-conditioning and cooling systems to address global warming. However, it used to require larger compressor size due to the lower fluid density compared with conventional refrigerants such as R410A. Thus, a new wing-vane compressor which has no contraction between the vane and the cylinder is developed to prevent increase in the size without performance degradation. Â Rotary motion of the vane is supported by the partial arc guide on the upper and lower ends of the vane. Revealing the lubricating properties of the guide was one of the development issues. Â So we have analyzed the guide bearing performance such as friction coefficient and oil film thickness with fluid dynamics lubrication model of the guide bearing. And we measured the friction coefficient of the guide bearing by experiment. The analysis model was validated by comparing the simulated friction coefficient and that of experiment. In addition, we examined the effect of the shape of the guide bearing on the lubricating properties. The results are as follows: (1)When the load is applied to the center of the guide arc angle, the friction coefficient of the analysis and experiment result is in good agreement. (2)The friction coefficient of the guide bearing can be organized in Stribeck diagram as well as full journal bearing in the fluid lubrication region

研究計画「南極氷床と気候の変動及び相互作用」の紹介

第6回極域科学シンポジウム分野横断セッション：[IG] 全球環境変動を駆動する南大洋・南極氷床11月17日（火）　国立極地研究所 2階 大会議

Analysis of cement pastes and mortars by a combination of backscatter-based SEM image analysis and calculations based on the Powers model

Formation of microstructure in cement pastes and mortars were quantitatively analyzed by the SEM-BSE image analysis. Effects of water/cement ratio and of the addition of mineral admixtures on the contents of unhydrated cement particles and pores were discussed. The proportions of each phase obtained by the analyses were compared with proportions calculated on the Powers model. It was found from comparisons that the volume fractions of the residual cement and pores obtained by the image analysis did not contradict those estimated from the Powers model. Lower water/cement ratio pastes and those undergoing pozzolanic reaction showed less fine capillary pores. It was also found that large capillary pores still remained in the mixtures at long ages. The gel/space ratio in the Powers and Brownyard equation was calculated from the phase constituents determined by the image analysis. For mortars without mineral admixture, the gel/space ratio by the image analysis could be related to the strength