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Resistive Switching Multistate Nonvolatile Memory Effects in a Single Cobalt Oxide Nanowire
Nagashima, Kazuki,Yanagida, Takeshi,Oka, Keisuke,Taniguchi, Masateru,Kawai, Tomoji,Kim, Jin-Soo,Park, Bae Ho American Chemical Society 2010 NANO LETTERS Vol.10 No.4
<P>A multistate nonvolatile memory operated at sublithographic scale has been strongly desired since other nonvolatile memories have confronted the fundamental size limits owing to their working principles. Resistive switching (RS) in metal−oxide−metal junctions, so-called ReRAM, is promising for next generation high-density nonvolatile memory. Self-assembled oxide nanowire-based RS offers an attractive solution not only to reduce the device size beyond the limitation of current lithographic length scales but also to extract the underlying nanoscale RS mechanisms. Here we demonstrate the multistate bipolar RS of a single Co<SUB>3</SUB>O<SUB>4</SUB> nanowire (10 nm scale) with the endurance up to 10<SUP>8</SUP>. In addition, we succeeded to extract a voltage-induced nanoscale RS mechanism rather than current-induced RS. These findings would open up opportunities to explore not only for the intrinsic nanoscale RS mechanisms with the ultimate size limit but also for next generation multistate three-dimensional ReRAM.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2010/nalefd.2010.10.issue-4/nl9042906/production/images/medium/nl-2009-042906_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl9042906'>ACS Electronic Supporting Info</A></P>
Seismic response analysis of an oil storage tank using Lagrangian fluid elements
Nagashima, Toshio,Tsukuda, Takenari Techno-Press 2013 Coupled systems mechanics Vol.2 No.4
Three-dimensional Lagrangian fluid finite element is applied to seismic response analysis of an oil storage tank with a floating roof. The fluid element utilized in the present analysis is formulated based on the displacement finite element method considering only volumetric elasticity and its element stiffness matrix is derived by using one-point integration method in order to avoid volumetric locking. The method usually adds a rotational penalty stiffness to satisfy the irrotational condition for fluid motion and modifies element mass matrices through the projected mass method to suppress spurious hourglass-mode appeared in compensation for one-point integration. In the fluid element utilized in the present paper, a small hourglass stiffness is employed. The fluid and structure domains for the objective oil storage tank are modeled by eight-node solid elements and four-node shell elements, respectively, and the transient response of the floating roof structure or the free surface are evaluated by implicit direct time integration method. The results of seismic response analyses are compared with those by other method and the validation of the present analysis using three-dimensional Lagrangian fluid finite elements is shown.
Nagashima, Fumiaki,Nishiyama, Ryohta,Iwao, Beniko,Kawai, Yuiko,Ishii, Chikanao,Yamanaka, Tsuyoshi,Uchino, Hiroyuki,Inazu, Masato The Korean Society of Applied Pharmacology 2018 Biomolecules & Therapeutics(구 응용약물학회지) Vol.26 No.4
In this study, we examined the molecular and functional characterization of choline uptake in the human esophageal cancer cells. In addition, we examined the influence of various drugs on the transport of [$^3H$]choline, and explored the possible correlation between the inhibition of choline uptake and apoptotic cell death. We found that both choline transporter-like protein 1 (CTL1) and CTL2 mRNAs and proteins were highly expressed in esophageal cancer cell lines (KYSE series). CTL1 and CTL2 were located in the plasma membrane and mitochondria, respectively. Choline uptake was saturable and mediated by a single transport system, which is both $Na^+$-independent and pH-dependent. Choline uptake and cell viability were inhibited by various cationic drugs. Furthermore, a correlation analysis of the potencies of 47 drugs for the inhibition of choline uptake and cell viability showed a strong correlation. Choline uptake inhibitors and choline deficiency each inhibited cell viability and increased caspase-3/7 activity. We conclude that extracellular choline is mainly transported via a CTL1. The functional inhibition of CTL1 by cationic drugs could promote apoptotic cell death. Furthermore, CTL2 may be involved in choline uptake in mitochondria, which is the rate-limiting step in S-adenosylmethionine (SAM) synthesis and DNA methylation. Identification of this CTL1- and CTL2-mediated choline transport system provides a potential new target for esophageal cancer therapy.
Nagashima, Kazuki,Yanagida, Takeshi,Oka, Keisuke,Kanai, Masaki,Klamchuen, Annop,Rahong, Sakon,Meng, Gang,Horprathum, Mati,Xu, Bo,Zhuge, Fuwei,He, Yong,Park, Bae Ho,Kawai, Tomoji American Chemical Society 2012 NANO LETTERS Vol.12 No.11
<P>This study demonstrates the effect of surroundings on a memristive switching at nanoscale by utilizing an open top planar-type device. NiO<SUB><I>x</I></SUB> and CoO<SUB><I>x</I></SUB> planar-type devices have exhibited a memristive behavior under atmospheric pressure, whereas TiO<SUB>2-<I>x</I></SUB> planar-type devices did not show a memristive switching even under the same surroundings. A memristive behavior of TiO<SUB>2-<I>x</I></SUB> planar-type devices has emerged when reducing an ambient pressure and/or employing a SiO<SUB>2</SUB> passivation layer. These results reveal that a thermodynamical interaction with surroundings critically determines the occurrence of memristive switching via varying a stability of nonstoichiometry. Since this effect tends to be more significant for smaller devices with larger specific surface area, tailoring the surrounding effect by an appropriate passivation will be essential for high density devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2012/nalefd.2012.12.issue-11/nl302880a/production/images/medium/nl-2012-02880a_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl302880a'>ACS Electronic Supporting Info</A></P>
Hydrodynamics of a Spouted Bed with an Impermeable Draft Tube for Binary Particle Systems
Nagashima, Hiroshi,Ishikura, Toshifumi,Ide, Mitsuharu 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.5
A spouted bed with an impermeable draft tube was employed to obtain fundamental data of binary mixtures of glass beads for both the operating conditions and the design factors. These data were compared with those for the coarser particle system only. From this view point, minimum spouting velocity, pressure drop, hold-up of solid particles within a draft tube, upward gas flow rate within the annulus and solids circulation rate were determined by changing the total gas flow rate and mass fraction of finer particles as operating parameters and by changing distance of entrainment zone and draft tube diameter as geometric parameters.
Intrinsic Mechanisms of Memristive Switching
Nagashima, Kazuki,Yanagida, Takeshi,Oka, Keisuke,Kanai, Masaki,Klamchuen, Annop,Kim, Jin-Soo,Park, Bae Ho,Kawai, Tomoji American Chemical Society 2011 Nano letters Vol.11 No.5
<P>Resistive switching (RS) memory effect in metal-oxide-metal junctions is a fascinating phenomenon toward next-generation universal nonvolatile memories. However the lack of understanding the electrical nature of RS has held back the applications. Here we demonstrate the electrical nature of bipolar RS in cobalt oxides, such as the conduction mechanism and the switching location, by utilizing a planar single oxide nanowire device. Experiments utilizing field effect devices and multiprobe measurements have shown that the nanoscale RS in cobalt oxides originates from redox events near the cathode with p-type conduction paths, which is in contrast with the prevailing oxygen vacancy based model.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2011/nalefd.2011.11.issue-5/nl200707n/production/images/medium/nl-2011-00707n_0003.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl200707n'>ACS Electronic Supporting Info</A></P>
Impacts to the Micronesian islands by environmental change of globalization and climate change
Nagashima, Shunsuke The Ecological Society of Korea 2010 Journal of Ecology and Environment Vol.33 No.2
This article focused on the environmental changes on atolls in Micronesia. First, we considered the problem. Second, we designed research that focused on the impacts of environmental changes especially in relation to globalization and global warming in the Federated States of Micronesia (FSM). The results were in accordance to the hypotheses that globalization had impacted prominently in communities on main islands and impact was lessened with increased distance from the centre. The fact that the islands are remotely situated and thus, in theory, do not have much outside influence, has not alleviated them from having societal concerns. The earth's environmental change is causing an impact on the main islands as well. This has been governed by distinctive characteristics in their geographical, regional, and contents. Moreover, they showed stronger concerns about impacts on the environment than globalization. A set of questionnaires was used as the principal assessment method to quantify the concerns relating to the environmental changes.
Spontaneous formation of aligned DNA nanowires by capillarity-induced skin folding
Nagashima, So,Ha, Hyun Dong,Kim, Do Hyun,Koš,mrlj, Andrej,Stone, Howard A.,Moon, Myoung-Woon National Academy of Sciences 2017 Proceedings of the National Academy of Sciences Vol.114 No.24
<P>Although DNA nanowires have proven useful as a template for fabricating functional nanomaterials and a platform for genetic analysis, their widespread use is still hindered because of limited control over the size, geometry, and alignment of the nanowires. Here, we document the capillarity-induced folding of an initially wrinkled surface and present an approach to the spontaneous formation of aligned DNA nanowires using a template whose surface morphology dynamically changes in response to liquid. In particular, we exploit the familiar wrinkling phenomenon that results from compression of a thin skin on a soft substrate. Once a droplet of liquid solution containing DNA molecules is placed on the wrinkled surface, the liquid from the droplet enters certain wrinkled channels. The capillary forces deform wrinkles containing liquid into sharp folds, whereas the neighboring empty wrinkles are stretched out. In this way, we obtain a periodic array of folded channels that contain liquid solution with DNA molecules. Such an approach serves as a template for the fabrication of arrays of straight or wrinkled DNA nanowires, where their characteristic scales are robustly tunable with the physical properties of liquid and the mechanical and geometrical properties of the elastic system.</P>