79,029 research outputs found
Optimal estimates for the electric field in two dimensions
No full textAbstractWe establish both upper and lower bounds on the electric field in the case where two circular conductivity inclusions are very close but not touching. We also obtain such bounds when a circular inclusion is very close to the boundary of a circular domain which contains the inclusion. The novelty of these estimates, which improve and make complete our earlier results in [H. Ammari, H. Kang, M. Lim, Gradient estimates for solutions to the conductivity problem, Math. Ann. 332 (2005) 277–286], is that they give an optimal information about the blow-up of the electric field as the conductivities of the inclusions degenerate
Probing the CP-even Higgs sector via H(3) -> H(2)H(1) in the natural next-to-minimal supersymmetric standard model
No full textZhaofeng Kang, Jinmian Li, Tianjun Li, Da Liu, and Jing Sh
A Two-stage Signal Decomposition into Jump, Oscillation and Trend using ADMM
No full textWe present a thorough implementation of the two-stage framework proposed in [A. Cicone, M. Huska, S.H. Kang and S. Morigi, JOT: a Variational Signal Decomposition into Jump, Os-cillation and Trend, IEEE Transactions on Signal Processing, 2022]. The method assumes as input a 1D signal represented by a finite-dimensional vector in RN. In the first stage the signal is decomposed into Jump (piece-wise constant), Oscillation, and Trend (smooth) components, and in the second stage the results are refined using residuals of other components. We pro-pose an efficient numerical solution for the first stage based on alternating direction method of multipliers, and a solid algorithm for the solution of the second stage
Kinetic studies of Ca2+ binding and Ca2+ clearance in the cytosol of adrenal chromaffin cells
No full textThe Ca2+ binding kinetics of fura-2, DM-nitrophen, and the endogenous Ca2+ buffer, which determine the time course of Ca2+ changes after photolysis of DM-nitrophen, were studied in bovine chromaffin cells. The in vivo Ca2+ association rate constants of fura-2, DM-nitrophen, and the endogenous Ca2+ buffer were measured to be 5.17 x 10(8) M-1 s-1, 3.5 x 10(7) M-1 s-1, and 1.07 x 10(8) M-1 s-1, respectively. The endogenous Ca2+ buffer appeared to have a low affinity for Ca2+ with a dissociation constant around 100 microM. A fast Ca2+ uptake mechanism was also found to play a dominant role in the clearance of Ca2+ after flashes at high intracellular free Ca2+ concentrations ([Ca2+]), causing a fast [Ca2+]i decay within seconds. This Ca2+ clearance was identified as mitochondrial Ca2+ uptake. Its uptake kinetics were studied by analyzing the Ca2+ decay at high [Ca2+]i after flash photolysis of DM-nitrophen. The capacity of the mitochondrial uptake corresponds to a total cytosolic Ca2+ load of approximately 1 mM
Haliclona (Reniera) juckdoensis Kim & Kang 2020, sp. nov.
No full textHaliclona (Reniera) juckdoensis sp. nov. (Fig. 3 A–F, Table 3) Material examined. Korea, Gyeongsangbuk-do, Ulleung-gun, Ulleung-up, Juck-do, MAY 17, 2017, SCUBA, 18 m depth, coll. Kim H.S, MABIK IV00168258. Description. Shape (Fig. 3A): Sprawling masses of conical tube with fairly thin rims, tubes 1–2 cm, 1.5 cm in thickness and 5–6 cm in width. Colour: Ivory in life which gradually changes to beige in alcohol. Oscula: 0.7–1cm in diameter, open at top of tube. Texture: Soft, fragile, compressible. Surface: Smooth, even. Skeleton (Fig. 3 C–F): Ectosomal skeleton, a regular tangential, reticulation of single spicules, bound at the nodes by a small amount of sponging. Choanosomal skeleton, isotropic to ladder-like reticulation by unispicular primary lines regularly connected by unispicular secondary lines. Spicules (Fig. 3B): Two sizes of oxea, no microscleres. Thick oxea 180–210 × 10–12.5 μm in size. Thin oxea 130–160 × 2–5 μm in size. Distribution. Only found in the Ulleung-do Island, Juck do at depth of 18 m. Etymology. Named after from the locality, Juck-do, Korea. Remarks. H. (R.) juckdoensis sp. nov. is allocated in the subgenus by having choanosomal skeleton of regular, unispicular, isotropic reticulation. Spongin has always present at the nodes of spicules. This new species differs from other Haliclona (Reniera) in having two size categories of oxea. We compared our new species with Haliclona (Reniera) species in the northwestern part of the Indo-Pacific regions. H. (R.) juckdoensis sp. nov. differs from all other Haliclona (Reniera) species from Japan based on spicule composition (Table 3). Species recorded by Hoshino were not comparable due to differences in skeletal structure. The species that Hoshino announces are all bundles of primary skeletons, which require reconfirmation of Subgenus. Therefore, it is necessary to review the species of subgenus. So, we compared our species to other species in Korea in Table 1. The most similar species to H. (R.) juckdoensis sp. nov. is H. (R.) hongdoensis Kang & Sim, 2007. However, it differs from the latter by having one categories of oxea, while H. (R.) juckdoensis sp. nov. have two size category of oxea (Table 4). References: (1) Hoshino, 1981Published as part of Kim, Hyung June & Kang, Dong Won, 2020, Two New Species of the Genus Haliclona from Korea, pp. 289-295 in Zootaxa 4890 (2) on pages 291-294, DOI: 10.11646/zootaxa.4890.2.10, http://zenodo.org/record/430180
Haliclona (Reniera) oceanus Kim & Kang 2020, sp. nov.
No full textHaliclona (Reniera) oceanus sp. nov. (Fig. 2 A–G, Table 2) Material examined. Holotype. Korea, Jeju-do, Seogqipo-si, Daejeong-eup, Ieodo Ocean Research Station, 25 m depth, June 30, 2017, SCUBA, coll. Sang-Hui Lee, MABIK IV00168257. Description. Shape (Fig. 2A): Thickly encrusting to massive, with slightly elevated oscular rims, 2.5–3 cm in thickness and 8 × 7 cm in width. Oscula: 0.3–0.7 cm in diameter, scattered on surface. Colour: Gray in life which gradually changes to dark ivory in alcohol. Texture: Soft, fragile, and compressible. Surface: Smooth and even. Skeleton (Fig.2 D–G): Ectosomal skeleton, detachable, tangential, unispicular isotropic reticulation of single spicules with spongin. Choanosomal skeleton, isotropic to ladder-like reticulation by unispicular primary lines regularly connected by unispicular secondary lines. Spicules (Fig. 2 B–C): Two size categories of oxea, no microscleres. Large oxea 190–230 × 7–15 μm in size. Small oxea 70–100 × 2.5–5 μm in size. Distribution. Only found in Ieodo Ocean Research Station at depth of 25 m. Etymology. Named after from the locality, Ieodo Ocean Research Station, Korea. Remarks. Haliclona (Reniera) oceanus sp. nov. is similar to H. (H.) ieoensis Kim et al. 2017 in shape, habitat, growth form, but it differs in color, ectosomal, choanosomal skeleton and spicule size. The ectosomal skeleton of H. (H.) ieoensis is not specialized. It is reticularly arranged by unispicular oxea. However, ectosomal skeletal structure of H. (R.) oceanus sp. nov. arranged by unispicular isotropic reticulation of single spicules. The size of the oxeas of H. (H.) ieoensis is larger than that of H. (R.) oceanus sp. nov. (Table 2). 2017.Published as part of Kim, Hyung June & Kang, Dong Won, 2020, Two New Species of the Genus Haliclona from Korea, pp. 289-295 in Zootaxa 4890 (2) on page 291, DOI: 10.11646/zootaxa.4890.2.10, http://zenodo.org/record/430180
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