The construction of a large-scale cryogenic gravitational wave telescope, KAGRA, has been completed, and four sapphire test masses have been installed in cryostat vacuum chambers. Recently, it was ...observed that a sapphire substrate used for one of the input test masses showed a characteristic structure in its transmission map due to nonuniformity of the crystal. We performed an interferometer simulation to observe the influence of the nonuniformity using measured transmission/reflection maps. Shot noise increased by 7% at low frequencies and by 16% at high frequencies. Laser frequency noise coupling increased by 1 order of magnitude. We also found deformation of an alignment control signal and higher tilt coupling in the output optics.
We have been developing radiation-resistant warm magnets insulated by cyanate ester (CE) resins. A glass fiber cloth prepreg tape was fabricated using CE pre-polymers supplied by Mitsubishi Gas ...Chemical Company Inc. Proton beam irradiation tests were carried out for evaluation of the radiation hardness. We prepared cured resin samples of cyanate ester, bismaleimide triazine (BT), and epoxy resins using the same glass fiber cloth. The resin samples were irradiated by a 70-MeV proton beam at doses up to 10 9 Gy at the Cyclotron and Radioisotope Center, Tohoku University. The results of tensile tests after irradiation showed that the radiation resistance of the CE resins was almost same as that of BT resins and more than 10 times as high as that of epoxy resins. We also developed a CE putty for use in coil moldings. A curing test was performed on a coil mock-up made of a stack of hollow conductors wrapped with the CE prepreg tapes and putty. We successfully cured the coil mock-up without causing thermal runaway.
The new species of Zanclea sango sp. nov. is described from Okinawajima Island, Ryukyu Archipelago, south-western Japan. The new hydrozoan species is associated with at least three scleractinian ...corals (Pavona divaricata, P. venosa and Psammocora contigua). Zanclea sango sp. nov. is a polymorphic hydroid and the hydrorhiza grows between the coral skeleton and calicoblastic ectoderm. The hydrocaulus and hydrorhiza are surrounded by perisarc. Newly released medusae are almost spherical, with four perradial exumbrellar nematocyst pouches including stenoteles, and two long marginal tentacles with cnidophores containing macrobasic euryteles. Zanclea sango sp. nov. is allied to Zanclea gilii Boero et al., 2000 and Zanclea margaritae Pantos & Bythell, 2010, but it is distinguished by its cnidome, the presence of a perisarc around hydrorhiza, and lower host-specificity. According to a hypothetical Zanclea phylogeny, the ancestral species of Zanclea had an opportunistic association with some benthic organisms, such as algae or bivalves, and its hydrorhiza was covered by a perisarc. Later, some species established specific associations with benthic animals, after which the hydrorhiza lost the perisarc and became directly covered with host tissue. Among Zanclea inhabiting corals, the present species, with multiple coral host species and a perisarc around the hydrorhiza, seems to retain more ancestral character states than Z. gilii and Z. margaritae, which have specific coral host species and no perisarc around the hydrorhiza.
Four morphotypes are recognized in the photosymbiotic ascidian Didemnum molle in the Ryukyu Archipelago: three color morphs (white, dark gray, and brown) of small-type colonies and one large-type ...colony (white with gray patches). The genetic variation among these four morphotypes was investigated by constructing phylogenetic trees based on a 401-bp fragment of the cytochrome oxidase subunit I (COI) gene of 29 specimens collected from five islands (Okinawajima, Sesokojima, Ikeijima, Kumejima, and Ishigakijima). The results support the monophyly of the genus Didemnum and that of the four morphotypes of D. molle. Moreover, the phylogenetic trees discriminated four clades corresponding to each morphotype. The geographic differences of the sequences were much smaller than the differences among the morphotypes, suggesting that the four morphotypes in D. molle are discrete sibling species.
Successful biological control requires detailed knowledge about the mass rearing conditions of the control agents in order to ensure higher quality of field-released insects. Thus, we investigated ...whether rearing fluctuating thermal condition would affect the fitness and costs of the parasitoid wasp
Telenomus podisi
Ashmead (a biocontrol agent used for controlling the Neotropical brown stink bug
Euschistus heros
(Fabricius)) when compared with parasitoid reared at constant temperature condition, which is commonly used in insect facilities. Parasitoids were reared under either constant (continuous exposure at 25 ± 2°C) or fluctuating temperature conditions (i.e., 30 ± 2°C during day and 20 ± 2°C at night) during four consecutive generations. Our results indicated that tested fluctuating temperature is more suitable for rearing of
T. podisi
as such temperature condition not only resulted in fitness benefits (e.g., shorter developmental time, longer female longevity, higher fecundity/fertility) but also reduced (approximately 23.5%) the estimated costs for producing the parasitoids. Furthermore, rearing
T. podisi
under fluctuating temperatures improved tolerance to low constant temperatures (i.e., 20°C) without changing the tolerance to constant high temperatures (30°C) in the fourth generation. Surprisingly, even parasitoids that developed under fluctuating thermal conditions performed better than those reared at constant temperature of 25°C. Collectively, our findings suggest that
T. podisi
reared under fluctuating thermal condition can tolerate better fluctuating temperatures that normally occur both during long periods of transport and in agricultural ecosystems, which will increase the quality and productivity of mass-reared
T. podisi
for inundative releases.
Construction of a new primary beam line, called the B-line, started in 2013 at the J-PARC Hadron Experimental Facility. The B-line is branched at the middle of an existing primary proton beam line ...(A-line) in the beam switching yard (SY), which is the connecting tunnel between the Main Ring (MR) and the Hadron experimental hall (HD-hall). At the branching point, about 0.1% of the primary beam is kicked off at 5 degrees using a Lanbertson magnet and two septum magnets. The Lambertson magnet has a field free hole in its yoke. The proton beam that goes through a field region is separated from the A-line, and it is extracted to the B-line. The rest of the beam that goes through the field free hole is transported through the existing primary beam line. Since a significant beam loss as much as 420 W occurs at the edge of field free hole, the magnets near the Lambertson magnet are operated under a very high radioactive environment. We have developed a "mini-chimney system" regarding easy maintenance of those magnets. The mini-chimney means a vertical tower of approximately 1m in height. The tower is comprised of water pipes, power electrodes, and signal cables for safety interlock. Those can be easily connected and disconnected at the top of chimney on the ceiling iron shields. In this paper we summarize the maintenance scheme developed for the B-line, as well as the design of B-line.In May 2020, the first proton beam was successfully extracted to the B-line by means of the Lambertson and the septum magnets. Up to now, the 10 10 protons per 5.2 sec accelerator cycle shot have been available.
Abstract
A double-$\Lambda$ hypernucleus, _{\Lambda\Lambda}\mathrm{Be}$, was observed by the J-PARC E07 Collaboration in nuclear emulsions tagged by the ($K^{-}, K^{+}$) reaction. This event was ...interpreted as the production and decay of $ {}_{\Lambda\Lambda}^{\;10}\mathrm{Be}$, _{\Lambda\Lambda}^{\;11}\mathrm{Be}$, or _{\Lambda\Lambda}^{\;12}\mathrm{Be}^{*}$ via $\Xi^{-}$ capture in ^{16}\mathrm{O}$. By assuming capture in the atomic 3D state, the binding energies of two $\Lambda$ hyperons ($B_{\Lambda\Lambda}$) of these double-$\Lambda$ hypernuclei are obtained to be $15.05 \pm 0.11\,\mathrm{MeV}$, $19.07 \pm 0.11\,\mathrm{MeV}$, and $13.68 \pm 0.11\,\mathrm{MeV}$, respectively. Based on the kinematic fitting, _{\Lambda\Lambda}^{\;11}\mathrm{Be}$ is the most likely explanation for the observed event.
Cardiodectes shini is a mesoparasitic copepod found on the heads of pygmy gobies. The copepod inserts its cephalothorax with antennary processes into the host tissues, while the trunk and egg sacs ...remain outside the host. The ultrastructure of the epicuticle surface differs among the antennary processes, cephalothorax, and trunk. In the antennary process, the epicuticle appears fuzzy and is less electron-dense than other parts of the body. This loose cuticle structure may be related to the absorption of nutrients in the host hemolymph. The cephalothorax and trunk have an electron-dense epicuticle: there is an array of minute protuberances on the epicuticle of the cephalothorax, whereas the trunk cuticle has no protuberances. This array of protuberances might be involved in suppression of the host immune response, because the cephalothorax has direct contact with the host connective tissues and similar structures are found on other parasitic copepods inhabiting host tissue.
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