103,057 research outputs found
Effects of oxidation and annealing temperature on grain boundary properties in polycrystalline silicon probed using nanometer-scale point-contact devices
No full textCarrier transport in polycrystalline silicon (poly-Si) is affected significantly byelectronic properties of grain boundaries (GBs). As future nanometre-scale devices, such as single-electron transistors (SETs), will have only a few GBs in the active region, the control and characterization of individual GBs will be vital to obtain reliable and reproducible device operation. We have characterized individual GBs in poly-Si using nanometer-scale devices.[1,2]In this work, we focus on the effects of oxidation and annealing temperature on the electrical characteristics of GBs. We have fabricated 30-nm-wide point-contact devices in a 50-nm-thick highly-doped n-type poly-Si film. The channel length was varied from 20 nm to 80 nm. These devices were subjected to oxidation in dry O2 gas at 650oC -1000oC for 1 hr. Some devices were followed by annealing in Ar ambient at 1000oC for15min after the oxidation. We have observed that oxidation at 650oC - 750oC oxidises the grain boundaries selectively, and that subsequent annealing increases the associated potential barrier height and tunnel resistance. These are explained by structural changes in the Si-O network at the grain boundaries and the competition between surface oxygen diffusion and oxidation from the GBs into the crystalline grains
Xestoleberis petrosa Chand & Kamiya, 2016, n. sp.
No full textXestoleberis petrosa n. sp. Type series. Holotype: male UMUT RA32524 (Figs. 9 A–B’, E–F, J, 2M–N). Paratypes: male—UMUT RA32528 (Fig. 13 A–B, F1–F2), females—UMUT RA32526 (Fig. 9 C–D), UMUT RA32527 (Fig. 9 G–I, K), UMUT RA32529 (Fig. 13 D–E), UMUT RA32530 (Fig. 13 C). All type material was collected from the type locality. The holotype and paratypes are deposited at the University Museum, University of Tokyo, Japan. Valves on paleontological paper/cavity slides and soft parts mounted on glass slides. Additional paratypes preserved in 70% ethanol: two males and one female UMUT RA32525. Type locality. The rocky, open northwest coast of Tavewa Island in the Yasawa Group (P1, Fig. 1, Table 1); habitat: cushion like green algae (Dictyosphaeria versluysii). Etymology. Petrosa is Latin for rocky. This species was characteristic of algae growing on a rocky headland on the north west of Tavewa Island (Fig. 1). Diagnosis. Posterior end of carapace more widely rounded than anterior end. Carapace dorsoventrally flattened, coloration in living animals translucent, smooth and dotted with pores. Prominent ventral indentation two fifths of way from anterior. BO short segment with five terminating setae. Ejaculatory duct appears as two stacked layers separated by a single loop. Furca reduced to a short seta. Description. Carapace reniform, inflated and elongated (Figs. 2 M–N, 13A–F2). Maximum valve length range: 328 µm–377 µm, maximum valve height range: 104 µm–165 µm (Table 2). Maximum height at mid-length. Dorsal margin convex, ventral margin with conspicuous indentation. Wide anterior and narrow posterior vestibula. Merodont hinge. Carapace surface scattered with normal sieve pores. Normal simple pores concentrated on anterior and antero-ventral edges of valve. Scar pattern; topmost scar of posterior row of four adductor scars, trefoil and single anterior scar U-shaped. An1 with six podomeres; first two big and elongated, third–sixth small and quadrate (Fig. 9 A–A’). Second, third and fourth podomeres with one dorsal apical seta each, two dorsal apical setae on fifth podomere, sixth podomere with three fine and one slender, round-tipped terminating setae. An2 with one dorsal apical seta on first endopodite podomere, one dorsal and ventral medial seta and one ventral apical seta of second endopodite podomere (Fig. 9 B–B’). Pectinate terminating claws. Md coxa with six pointed teeth and two fine setae (Fig. 9 C– D). Palp with four podomeres: one dorsal and two ventral apical setae on second podomere, three medial setae at junction of second and third podomeres, two dorsal, two ventral medial setae and one ventral apical seta on third podomere, two medial setae at junction of third and fourth podomere and three stout terminating setae of fourth podomere. Mx with two segmented palp; first segment with three distal dorsal-apical setae and second segment with four terminating setae (Fig. 8 E–E’). Branchial plate with 12–14 setuled setae. BO symmetrical short segment with five terminating setae (Fig. 8 F). Basal setal formula for L5 1:2:1 and L6 and L7 1:1:1 (Fig. 8 G–I). Terminating claws of thoracic legs: L5 and L6 curved, L7 straight. Hp with asymmetrical triangular distal processes; one with sharply pointed tip, other with rounded tip (Fig. 8 J). Proximal ends of capsules sub-rounded and proximal support structure T-shaped. Furca, short fine setae on round base. Distribution. Out of the eight locations sampled for ostracods across Fiji, X. petrosa n. sp. was only collected at one site (type locality above). Specimens of X. petrosa n. sp. were also collected from a short red alga inhabiting the same rocky substrate as Dictyosphaeria versluysii (holotype habitat) and a bluegreen alga. Remarks. Carapace appearance and size of Xestoleberis petrosa n. sp. is similar to Xestoleberis planuventer Sato & Kamiya, 2007 (Fig. 13 Sato & Kamiya 2007) reported from Okinawa, Japan. However, the soft part morphologies of both species differ. X. planuventer —hirsute An2 and leg (L5, L6, L7) setae, crown of setae on the base of L6 and L7 claw and tip of L7 is serrated. These features are absent in X. petrosa n. sp. In addition, the ejaculatory duct arrangement, the shape of the distal processes and the proximal structure of the Hp of both species are different.Published as part of Chand, Prerna & Kamiya, Takahiro, 2016, Seven new species of the genus Xestoleberis (Ostracoda: Podocopida: Cytheroidea) from the Fiji Archipelago, pp. 325-348 in Zootaxa 4208 (4) on pages 340-342, DOI: 10.11646/zootaxa.4208.4.2, http://zenodo.org/record/20833
粒子法による嚥下シミュレータを用いた嚥下中の食塊挙動の数値評価に関する研究
No full text岩手大学博士（農学）原著論文
1. Kamiya, T., Toyama, Y., Hanyu, K., Takai, M., Kikuchi, T., Michiwaki, Y., and Koshizuka, S.
Numerical visualization of physical values during human swallowing using a three-dimensional swallowing simulator ‘Swallow Vision®’ based on the moving particle simulation method: Part 1: quantification of velocity, shear rate and viscosity during swallowing
Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization, 7 (4), 382-388, 2019
2. Kamiya, T., Toyama, Y., Hanyu, K., Kikuchi, T., and Michiwaki, Y.
Visualization of aspiration due to changes in rheological and tribological parameters using a three-dimensional swallowing simulator
Nihon Reoroji Gakkaishi, 51 (3), 149-156, 2023
3. Kamiya, T., Toyama, Y., Hanyu, K., Kikuchi, T., and Michiwaki, Y.
Newtonian and non-Newtonian food bolus behaviors obtained from validated swallowing simulator based on moving particle simulation
Food Science and Technology Research, 29 (5), 385-402, 2023
4. Kamiya, T., Toyama, Y., Hanyu, K., Kikuchi, T., and Michiwaki, Y.
Development and preliminary validity evaluation of numerical simulation of human swallowing using a particle method
Japan Journal of Food Engineering, 24 (3), 57-66, 2023
5. Kamiya, T., Toyama, Y., Hanyu, K., Kikuchi, T., and Michiwaki, Y.
Correlation between forces acting on bolus and bolus behavior during swallowing using graph matrix obtained from computer simulations with the MPS method
Food Science and Technology Research, 30 (1), 13-24, 2024doctoral thesi
Single-electron charging phenomena in nano/polycrystalline silicon point-contact transistors
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Characterisation of tunnel barriers in polycrystalline silicon point-contact single-electron transistors
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Mesoplodon ginkgodens Nishiwaki and Kamiya 1958
No full text<i>Mesoplodon ginkgodens</i> Nishiwaki and Kamiya, 1958 —Ginkgo-toothed Beaked Whale <p> <i>Mesoplodon ginkgodens</i> Nishiwaki and Kamiya, 1958 p.53; Type locality- Oiso Beach, Sagami Bay (near Tokyo), Japan; Kim <i>et al</i>., p.79; Kim, 2004 p.236.</p> <p> <b>Range:</b> The overall range of the species covers temperate and tropical waters in the North Pacific and Indian Oceans. Most of the records have originated from the seas around Japan (Taylor <i>et al</i>. 2008). Despite the regular stranding of ginkgo-toothed beaked whales in Japan (Yamada 2009), no stranding or by-catch has been reported in the waters of Korea (Fig. 89).</p> <p> <b>Remarks:</b> Despite the absence of records in Korea, the species has been listed as present since the National Fisheries Research Institute published <i>Whales of Korea</i> in 2000. Dalebout <i>et al</i>. (2012) presented genetic and morphological data supporting the resurrection of <i>M</i>. <i>hotaula</i> as either a separate species or a subspecies of <i>M</i>. <i>ginkgodens</i>. Three <i>Mesoplodon</i> stocks were identified in the Pacific Ocean. However, at this point, no subspecific classification has been proposed.</p>Published as part of <i>Jo, Yeong-Seok, Baccus, John T. & Koprowski, John L., 2018, Mammals of Korea: a review of their taxonomy, distribution and conservation status, pp. 1-216 in Zootaxa 4522 (1)</i> on page 133, DOI: 10.11646/zootaxa.4522.1.1, <a href="http://zenodo.org/record/2610198">http://zenodo.org/record/2610198</a>
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