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Dimensionality reduction

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https://www.readbyqxmd.com/read/28734151/magnetically-recyclable-reduced-graphene-oxide-nanosheets-magnetite-palladium-aerogel-with-superior-catalytic-activity-and-reusability
#1
Yan Feng, Hui Zhang, Baifu Xin, Jie Wu
A two-step method was employed to synthesize reduced graphene oxide nanosheets/magnetite-palladium (rGSs/Fe3O4-Pd) aerogel, with excellent catalytic activity and recyclability. Firstly, graphene oxide nanosheet (GS) hydrogels were formed by the self-assembly of GSs during the hydrothermal process. Meanwhile, hematite (α-Fe2O3) and Pd nanoparticles (NPs) were synthesized and anchored onto the surface of the hydrogel. During heat-treatment, GSs were reduced to rGSs, while nonmagnetic α-Fe2O3NPs were converted to magnetic Fe3O4 NPs...
July 14, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28728709/counterclockwise-maxillomandibular-advancement-surgery-and-disc-repositioning-can-condylar-remodeling-in-the-long-term-follow-up-be-predicted
#2
L R Gomes, L H Cevidanes, M R Gomes, A C Ruellas, D P Ryan, B Paniagua, L M Wolford, J R Gonçalves
This study investigated predictive risk factors of condylar remodeling changes after counterclockwise maxillomandibular advancement (CCW-MMA) and disc repositioning surgery. Forty-one female patients (75 condyles) treated with CCW-MMA and disc repositioning had cone beam computed tomography (CBCT) scans taken pre-surgery, immediately after surgery, and at an average 16 months post-surgery. Pre- and post-surgical three-dimensional models were superimposed using automated voxel-based registration on the cranial base to evaluate condylar displacements after surgery...
July 17, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28727548/mr-ntd-manifold-regularization-nonnegative-tucker-decomposition-for-tensor-data-dimension-reduction-and-representation
#3
Xutao Li, Michael K Ng, Gao Cong, Yunming Ye, Qingyao Wu
With the advancement of data acquisition techniques, tensor (multidimensional data) objects are increasingly accumulated and generated, for example, multichannel electroencephalographies, multiview images, and videos. In these applications, the tensor objects are usually nonnegative, since the physical signals are recorded. As the dimensionality of tensor objects is often very high, a dimension reduction technique becomes an important research topic of tensor data. From the perspective of geometry, high-dimensional objects often reside in a low-dimensional submanifold of the ambient space...
August 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28726685/enhanced-thermoelectric-performance-of-bi-sub-2-sub-te-sub-3-sub-by-uniform-dispersion-of-single-wall-carbon-nanotubes
#4
Kaleem Ahmad, Chunlei Wan
The advancement in nanostructured powder processing has attracted recently great interest as a cost effective and scalable strategy for high performance thermoelectric bulks. However, the level of technical breakthrough as realized in quantum dot supperlattice/wire has not yet demonstrated in these materials. Here, we report first ever study on the uniform dispersion of single wall carbon nanotubes (SWCNTs) in nanostructured Bi2Te3 bulk and their effect on thermoelectric parameters above room temperature. The Bi<sub>2</sub>Te<sub>3</sub> based SWCNTs composites were prepared through controlled powder processing and their thermoelectric properties were finely tuned at nanoscale by regulating various (0...
July 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28724794/apol1-variants-change-c-terminal-conformational-dynamics-and-binding-to-snare-protein-vamp8
#5
Sethu M Madhavan, John F O'Toole, Martha Konieczkowski, Laura Barisoni, David B Thomas, Santhi Ganesan, Leslie A Bruggeman, Matthias Buck, John R Sedor
APOL1 variants in African populations mediate resistance to trypanosomal infection but increase risk for kidney diseases through unknown mechanisms. APOL1 is expressed in glomerular podocytes and does not vary with underlying kidney disease diagnoses or APOL1 genotypes, suggesting that the kidney disease-associated variants dysregulate its function rather than its localization or abundance. Structural homology searches identified vesicle-associated membrane protein 8 (VAMP8) as an APOL1 protein interactor. VAMP8 colocalizes with APOL1 in the podocyte, and the APOL1:VAMP8 interaction was confirmed biochemically and with surface plasmon resonance...
July 20, 2017: JCI Insight
https://www.readbyqxmd.com/read/28723718/three-dimensional-head-mounted-gaming-task-procedure-maximizes-effects-of-vestibular-rehabilitation-in-unilateral-vestibular-hypofunction-a-randomized-controlled-pilot-trial
#6
Alessandro Micarelli, Andrea Viziano, Ivan Augimeri, Domenico Micarelli, Marco Alessandrini
Considering the emerging advantages related to virtual reality implementation in clinical rehabilitation, the aim of the present study was to discover possible (i) improvements achievable in unilateral vestibular hypofunction patients using a self-assessed head-mounted device (HMD)-based gaming procedure when combined with a classical vestibular rehabilitation protocol (HMD group) as compared with a group undergoing only vestibular rehabilitation and (ii) HMD procedure-related side effects. Therefore, 24 vestibular rehabilitation and 23-matched HMD unilateral vestibular hypofunction individuals simultaneously underwent a 4-week rehabilitation protocol...
July 18, 2017: International Journal of Rehabilitation Research. Revue Internationale de Recherches de Réadaptation
https://www.readbyqxmd.com/read/28723082/mixed-valency-in-a-3d-semiconducting-iron-fluoranilate-coordination-polymer
#7
Ryuichi Murase, Brendan F Abrahams, Deanna M D'Alessandro, Casey G Davies, Timothy A Hudson, Guy N L Jameson, Boujemaa Moubaraki, Keith S Murray, Richard Robson, Ashley L Sutton
A pair of coordination polymers of composition (NBu4)2[M2(fan)3] (fan = fluoranilate; M = Fe and Zn) were synthesized and structurally characterized. In each case the compound consists of a pair of interpenetrating three-dimensional, (10,3)-a networks in which metal centers are linked by chelating/bridging fluoranilate ligands. Tetrabutylammonium cations are located in the spaces between the two networks. Despite the structural similarity, significant differences exist between (NBu4)2[Fe2(fan)3] and (NBu4)2[Zn2(fan)3] with respect to the oxidation states of the metal centers and ligands...
July 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28722733/a-polyacrylonitrile-copolymer-silica-template-for-three-dimensional-hierarchical-porous-carbon-as-a-pt-catalyst-support-for-the-oxygen-reduction-reaction
#8
Minmin Liu, Jian Li, Chao Cai, Ziwei Zhou, Yun Ling, Rui Liu
Herein, we report a novel route to construct a hierarchical three-dimensional porous carbon (3DC) through a copolymer-silica assembly. In the synthesis, silica acts as a hard template and leads to the formation of an interconnected 3D macropore, whereas styrene-co-acrylonitrile polymer has been used as both a carbon source and a soft template for micro- and meso-pores. The obtained 3DC materials possess a large surface area (∼550.5 m(2) g(-1)), which facilitates high dispersion of Pt nanoparticles on the carbon support...
July 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28722426/tunable-volatile-organic-compound-sensor-by-using-au-nanoparticle-incorporation-on-mos2
#9
Soo-Yeon Cho, Hyeong-Jun Koh, Hae-Wook Yoo, Jong-Seon Kim, Hee-Tae Jung
Controlling the charge concentrations of two-dimensional (2D) materials is a critical requirement for realizing versatility and potential application of these materials in high-performance electronics and sensors. In order to exploit the novel chemical-sensing characteristics of 2D materials for sensitive and selective sensors, various functionalization methods are needed to ensure efficient doping of channels based on 2D materials. In the present study, the gas-sensing performance of MoS2 has been significantly enhanced by controlled Au nanoparticle functionalization...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722392/self-assembled-curved-macroporous-photonic-crystal-based-surfactant-detectors
#10
Chien-Fu Chiu, Hui-Ping Tsai, Ying-Chu Chen, Yi-Xuan He, Kun-Yi Andrew Lin, Hongta Yang
Surfactants are extensively used as detergents, dispersants, as well as emulsifiers. Thus, wastewater containing high-concentration surfactants discharged to the environment poses a serious threat to the ecosystem. Unfortunately, conventional detection methods for surfactants suffer from the use of sophisticated instruments, and cannot perform detections for various surfactants by a single analysis. The article reports the development of simple and sensitive surfactant detection using doctor blade coated three-dimensional curved macroporous photonic crystals on a cylindrical rod...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28722277/in-situ-growth-and-wrapping-of-aminoanthraquinone-nanowires-within-3d-graphene-framework-as-high-performance-foldable-organic-cathode-for-lithium-ion-batteries
#11
Guanhui Yang, Fanxing Bu, Yanshan Huang, Yu Zhang, Imran Shakir, Yuxi Xu
Small conjugated carbonyl compounds are intriguing candidates of organic electrode materials because of their abundance, high theoretical capacity and adjustable molecular structure. However, their dissolution in aprotic electrolytes and poor conductivity eclipse them in terms of practical capacity, cycle life and rate capability. Herein, we report a foldable and binder-free nanocomposite electrode consisting of 2-aminoanthraquinone (AAQ) nanowires wrapping within three-dimensional (3D) graphene framework, which is prepared through antisolvent crystallization followed by a facile chemical reduction and self-assembly process...
July 19, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28719849/selective-cathodic-microbial-biofilm-retention-allows-a-high-current-to-sulfide-efficiency-in-sulfate-reducing-microbial-electrolysis-cells
#12
Guillermo Pozo, Yang Lu, Sebastien Pongy, Jürg Keller, Pablo Ledezma, Stefano Freguia
Selective microbial retention is of paramount importance for the long-term performance of cathodic sulfate reduction in microbial electrolysis cells (MECs) due to the slow growth rate of autotrophic sulfate-reducing bacteria. In this work, we investigate the biofilm retention and current-to-sulfide conversion efficiency using carbon granules (CG) or multi-wall carbon nanotubes deposited on reticulated vitreous carbon (MWCNT-RVC) as electrode materials. For ~2months, the MECs were operated at sulfate loading rates of 21 to 309gSO4 -S/m(2)/d...
July 12, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28719555/the-influence-of-shortening-on-clinical-outcome-in-healed-displaced-midshaft-clavicular-fractures-after-nonoperative-treatment
#13
E B Goudie, N D Clement, I R Murray, C R Lawrence, M Wilson, A J Brooksbank, C M Robinson
BACKGROUND: We aimed to evaluate the effect of clavicular shortening, measured with 3-dimensional computed tomography (3DCT), on functional outcomes and satisfaction in patients with healed displaced midshaft clavicular fractures up to 1 year following injury. METHODS: The data used in this study were collected as part of a multicenter, prospective randomized controlled trial of open reduction and plate fixation compared with nonoperative treatment for acute, displaced midshaft clavicular factures...
July 19, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28718634/porous-uranyl-borophosphates-with-unique-three-dimensional-open-framework-structures
#14
Yucheng Hao, Gabriel L Murphy, Dirk Bosbach, Giuseppe Modolo, Thomas E Albrecht-Schmitt, Evgeny V Alekseev
Two novel alkali-metal uranyl borophosphates have been prepared and characterized for the first time, namely, K5(UO2)2[B2P3O12(OH)]2(OH)(H2O)2 and K2(UO2)12[B(H2PO4)4](PO4)8(OH)(H2O)6 denoted as KUPB1 and KUPB2, respectively. KUPB1 was obtained hydrothermally at 220 °C and crystallizes in a monoclinic structure in the chiral space group P21. The unit cell parameters of KUPB1 are a = 6.7623(2) Å, b = 19.5584(7) Å, c = 11.0110(4) Å, α = γ = 90°, β = 95.579(3)°, and V = 1449.42(8) Å(3). It features a unique three-dimensional (3D) open-framework structure, composed of two corner-sharing linked one-dimensional (1D) anionic borophosphates (BP), [B2P3O13](5-), along the a axis and uranyl phosphate (UP), [(UO2)(PO4)3](7-), chains along the c axis, further bridged by PO4 tetrahedra...
July 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28718343/application-of-t-sne-to-human-genetic-data
#15
Wentian Li, Jane E Cerise, Yaning Yang, Henry Han
The t-distributed stochastic neighbor embedding t-SNE is a new dimension reduction and visualization technique for high-dimensional data. t-SNE is rarely applied to human genetic data, even though it is commonly used in other data-intensive biological fields, such as single-cell genomics. We explore the applicability of t-SNE to human genetic data and make these observations: (i) similar to previously used dimension reduction techniques such as principal component analysis (PCA), t-SNE is able to separate samples from different continents; (ii) unlike PCA, t-SNE is more robust with respect to the presence of outliers; (iii) t-SNE is able to display both continental and sub-continental patterns in a single plot...
June 23, 2017: Journal of Bioinformatics and Computational Biology
https://www.readbyqxmd.com/read/28716925/symmetry-related-proton-transfer-pathways-in-respiratory-complex-i
#16
Andrea Di Luca, Ana P Gamiz-Hernandez, Ville R I Kaila
Complex I functions as the initial electron acceptor in aerobic respiratory chains of most organisms. This gigantic redox-driven enzyme employs the energy from quinone reduction to pump protons across its complete approximately 200-Å membrane domain, thermodynamically driving synthesis of ATP. Despite recently resolved structures from several species, the molecular mechanism by which complex I catalyzes this long-range proton-coupled electron transfer process, however, still remains unclear. We perform here large-scale classical and quantum molecular simulations to study the function of the proton pump in complex I from Thermus thermophilus The simulations suggest that proton channels are established at symmetry-related locations in four subunits of the membrane domain...
July 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28716820/complex-object-motion-represented-by-context-dependent-correlated-activity-of-visual-interneurones
#17
Paul C Dick, Nicole L Michel, John R Gray
Accurate and adaptive encoding of complex, dynamic visual information is critical for the survival of many animals. Studies across a range of taxa have investigated behavioral and neuronal responses to objects that represent a threat, such as a looming object approaching along a direct collision course. By investigating neural mechanisms of avoidance behaviors through recording multineuronal activity, it is possible to better understand how complex visual information is represented in circuits that ultimately drive behaviors...
July 2017: Physiological Reports
https://www.readbyqxmd.com/read/28711621/length-of-axons-expressing-the-serotonin-transporter-in-orbitofrontal-cortex-is-lower-with-age-in-depression
#18
Grazyna Rajkowska, Gouri Mahajan, Beata Legutko, Lavanya Challagundla, Michael Griswold, Paul R Albert, Mireille Daigle, Jose J Miguel-Hidalgo, Mark C Austin, Randy D Blakely, David C Steffens, Craig A Stockmeier
Studies of major depressive disorder (MDD) in postmortem brain tissue report enhanced binding to inhibitory serotonin-1A autoreceptors in midbrain dorsal raphe and reductions in length of axons expressing the serotonin transporter (SERT) in dorsolateral prefrontal cortex. The length density of axons expressing SERT in the orbitofrontal cortex (OFC) was determined in 18 subjects with MDD and 17 age-matched control subjects. A monoclonal antibody was used to immunohistochemically label the SERT in fixed sections of OFC...
July 13, 2017: Neuroscience
https://www.readbyqxmd.com/read/28711053/representations-in-neural-network-based-empirical-potentials
#19
Ekin D Cubuk, Brad D Malone, Berk Onat, Amos Waterland, Efthimios Kaxiras
Many structural and mechanical properties of crystals, glasses, and biological macromolecules can be modeled from the local interactions between atoms. These interactions ultimately derive from the quantum nature of electrons, which can be prohibitively expensive to simulate. Machine learning has the potential to revolutionize materials modeling due to its ability to efficiently approximate complex functions. For example, neural networks can be trained to reproduce results of density functional theory calculations at a much lower cost...
July 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28709280/collapse-of-resilience-patterns-in-generalized-lotka-volterra-dynamics-and-beyond
#20
Chengyi Tu, Jacopo Grilli, Friedrich Schuessler, Samir Suweis
Recently, a theoretical framework aimed at separating the roles of dynamics and topology in multidimensional systems has been developed [Gao et al., Nature (London) 530, 307 (2016)10.1038/nature16948]. The validity of their method is assumed to hold depending on two main hypotheses: (i) The network determined by the the interaction between pairs of nodes has negligible degree correlations; (ii) the node activities are uniform across nodes on both the drift and the pairwise interaction functions. Moreover, the authors consider only positive (mutualistic) interactions...
June 2017: Physical Review. E
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