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https://www.readbyqxmd.com/read/28651119/experimental-ultrasonic-characterization-of-polyester-based-materials-for-cultural-heritage-applications
#1
Andres Arciniegas, Loic Martinez, Arnaud Briand, Sophie Prieto, Stéphane Serfaty, Nicolas Wilkie-Chancellier
For several years, the Réunion des musées nationaux - Grand-Palais has produced polyester resin reproductions in order to replace marble sculptures that have weakened by outdoor exposure. These objects are made of a complex multilayered polyester composite material including reinforcements to ensure the mechanical strength of the final structure and mineral fillers that allow to imitate the original aesthetics. However, the final structure also weakens because of constant outdoor exposure and ageing. This observation leads today to conduct research related to the structural health monitoring of reproductions for preventive conservation of cultural heritage...
June 17, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28649831/non-abelian-parton-fractional-quantum-hall-effect-in-multilayer-graphene
#2
Yinghai Wu, Tao Shi, Jainendra K Jain
The current proposals for producing non-Abelian anyons and Majorana particles, which are neither fermions nor bosons, are primarily based on the realization of topological superconductivity in two dimensions. We show theoretically that the unique Landau level structure of bilayer graphene provides a new possible avenue for achieving such exotic particles. Specifically, we demonstrate the feasibility of a ``parton" fractional quantum Hall (FQH) state, which supports non-Abelian particles without the usual topological superconductivity...
June 26, 2017: Nano Letters
https://www.readbyqxmd.com/read/28649686/a-visible-light-active-tio2-photocatalyst-multilayered-with-wo3
#3
Junjun Jia, Kenta Taniyama, Masaaki Imura, Toshimasa Kanai, Yuzo Shigesato
Sputter-deposited TiO2 films with high visible-light photocatalytic activity were successfully realized by a hybrid TiO2/Pt/WO3 film structure with Pt nanoparticles uniformly distributed at the interface of the TiO2 and WO3 films. The TiO2/Pt/WO3 hybrid films enable the complete decomposition of CH3CHO under visible-light irradiation. The water contact angle of the TiO2/Pt/WO3 hybrid films reaches below 5° under visible-light irradiation. Pt nanoparticles are considered to act as a cocatalyst to improve the electron-hole separation efficiency...
June 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28648244/the-tales-athletes-tell-narrative-structure-and-identity-in-great-british-medalists
#4
Tristan J Coulter, Clifford J Mallett, Jefferson A Singer
Using a life story approach, Hardy and colleagues present a study examining the similarities and differences in the psychosocial development of UK-based elite and super-elite athletes. We found this work to be a highly personal account into the lives of these cohorts, which advances knowledge concerning the psychology and influencing events and circumstances that separate the good from the great performers. We make some suggestions for how to enrich the study's findings and approach, by (1) adopting McAdams' multilayer framework of personality, as an overarching structure for assessing the whole person, and (2) encouraging the authors to explore the narrative structure of the presented life stories and go beyond simply an interpretation of their content...
2017: Progress in Brain Research
https://www.readbyqxmd.com/read/28647414/effect-of-different-packaging-materials-containing-poly-2-tert-butylamino-methylstyrene-on-the-growth-of-spoilage-and-pathogenic-bacteria-on-fresh-meat
#5
S Dohlen, C Braun, F Brodkorb, B Fischer, Y Ilg, K Kalbfleisch, R Lorenz, M Kreyenschmidt, J Kreyenschmidt
The objective of this study was to investigate the effect of novel antimicrobial packaging materials containing poly-[2-(tertbutylamino) methylstyrene] (poly(TBAMS)) on the growth of typical spoilage and pathogenic bacteria present on meat. The antimicrobial activity of materials containing different poly(TBAMS) concentrations was determined by comparing the bacterial counts on reference and sample materials at different temperatures and times and in the presence of meat components. Storage tests with poultry fillets and veal cutlets were conducted with samples vacuum packaged in the reference foil and foil containing 10% poly(TBAMS)...
June 13, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28646763/deep-neural-mapping-support-vector-machines
#6
Yujian Li, Ting Zhang
The choice of kernel has an important effect on the performance of a support vector machine (SVM). The effect could be reduced by NEUROSVM, an architecture using multilayer perceptron for feature extraction and SVM for classification. In binary classification, a general linear kernel NEUROSVM can be theoretically simplified as an input layer, many hidden layers, and an SVM output layer. As a feature extractor, the sub-network composed of the input and hidden layers is first trained together with a virtual ordinary output layer by backpropagation, then with the output of its last hidden layer taken as input of the SVM classifier for further training separately...
June 21, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28646563/cohesive-network-reconfiguration-accompanies-extended-training
#7
Qawi K Telesford, Arian Ashourvan, Nicholas F Wymbs, Scott T Grafton, Jean M Vettel, Danielle S Bassett
Human behavior is supported by flexible neurophysiological processes that enable the fine-scale manipulation of information across distributed neural circuits. Yet, approaches for understanding the dynamics of these circuit interactions have been limited. One promising avenue for quantifying and describing these dynamics lies in multilayer network models. Here, networks are composed of nodes (which represent brain regions) and time-dependent edges (which represent statistical similarities in activity time series)...
June 24, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28645509/a-fast-and-reliable-method-for-daily-quality-assurance-in-spot-scanning-proton-therapy-with-a-compact-and-inexpensive-phantom
#8
Nicola Bizzocchi, Francesco Fracchiolla, Marco Schwarz, Carlo Algranati
In a radiotherapy center, daily quality assurance (QA) measurements are performed to ensure that the equipment can be safely used for patient treatment on that day. In a pencil beam scanning (PBS) proton therapy center, spot positioning, spot size, range, and dose output are usually verified every day before treatments. We designed, built, and tested a new, reliable, sensitive, and inexpensive phantom, coupled with an array of ionization chambers, for daily QA that reduces the execution times while preserving the reliability of the test...
June 20, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28645044/mussel-inspired-nano-multilayered-coating-on-magnesium-alloys-for-enhanced-corrosion-resistance-and-antibacterial-property
#9
Bi Wang, Liang Zhao, Weiwei Zhu, Liming Fang, Fuzeng Ren
Magnesium alloys are promising candidates for load-bearing orthopedic implants due to their biodegradability and mechanical resemblance to natural bone tissue. However, the high degradation rate and the risk of implant-associated infections pose grand challenges for their clinical applications. Herein, we developed a nano-multilayered coating strategy through polydopamine and chitosan assisted layer-by-layer assembly of osteoinductive carbonated apatite and antibacterial sliver nanoparticles on the surface of AZ31 magnesium alloys...
June 17, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28644818/fabrication-and-optical-properties-of-nanostructured-plasmonic-al2o3-au-al2o3-al2o3-metamaterials
#10
Hicham Bakkali, Eduardo Blanco, Manuel Dominguez, Jose S Garitaonandia
Discontinuous multilayer (DML) thin films, which consist of nano-granular metals (NGMs) embedded in a dielectric matrix, have attracted significant interest as engineered plasmonic metamaterials. In this study, a systematic layer-by-layer deposition of three-dimensional sub-wavelength periodic plasmonic DML structures via the radio frequency sputtering of a composite target has been reported. The overall optical response of the DML films composed of AuAl2O3 NGM homogenous layers, which are periodically sandwiched between two amorphous Al2O3 layers, are studied using reflection spectroscopic ellipsometry and transmission spectroscopy techniques...
June 23, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28644681/treatment-results-of-corneal-collagen-cross-linking-combined-with-riboflavin-and-440-nm-blue-light-for-bacterial-corneal-ulcer-in-rabbits
#11
Shufang Wei, Cuiying Zhang, Shaoru Zhang, Yanyun Xu, Guoying Mu
PURPOSE: To study the treatment effect of corneal collagen cross-linking (CXL) combined with 440 nm blue light and riboflavin on bacterial corneal ulcer using animal experiments. METHODS: A total of 21 New Zealand white rabbits that developed Staphylococcus aureus corneal ulcer were randomly divided into three groups. Seven rabbits were used as blank control groups; seven rabbits were treated with CXL combined with riboflavin and 440 nm blue light; and seven rabbits were treated with CXL combined with riboflavin and 370 nm ultraviolet A light...
June 23, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28642051/a-revisited-concept-contact-inhibition-of-growth-from-cell-biology-to-malignancy
#12
REVIEW
Domenico Ribatti
In cell biology, contact inhibition refers to two different but closely related phenomena, contact inhibition of locomotion and contact inhibition of proliferation, exhibited by fibroblasts when in contact with one another. Normal fibroblasts migrate across the surface of a culture dish until they make contact with a neighboring cell. Further cell migration is then inhibited, and normal cells adhere to each other, forming an orderly array of cells on the culture dish surface. Tumor cells, in contrast, continue moving after contact with their neighbors, migrating over adjacent cells, and growing in disordered, multilayered patterns...
June 20, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28641522/advances-on-ppar%C3%AE-research-in-the-emerging-era-of-precision-medicine
#13
Pinyi Lu, Zhongming Zhao
BACKGROUND: Peroxisome proliferator-activated receptor gamma (PPARγ) is a member of the nuclear receptor superfamily that functions as a ligand-inducible transcription factor. It regulates glucose and lipid metabolism, immunity, and cellular growth and differentiation. Thiazolidinediones (TZDs) are potent insulin sensitizers that function by activating PPARs, with a high specificity for PPARγ. Due to their ability to preserve pancreatic beta cell function and reduce insulin resistance, TZDs have become one of the most prescribed classes of medications for type 2 diabetes (T2D) since their approval by the US Food and Drug Administration (FDA) and initial use in 1997...
June 21, 2017: Current Drug Targets
https://www.readbyqxmd.com/read/28640583/fluffy-and-ordered-graphene-multilayer-films-with-improved-electromagnetic-interference-shielding-over-x-band
#14
Zicheng Wang, Renbo Wei, Xiaobo Liu
Highly ordered nitrogen-doped graphene multilayer films with large interlayer void are successfully fabricated by thermal annealing the compact stacking graphene oxide/copper phthalocyanine (GO/CuPc) multilayer films. Scanning electron microscopic (SEM), X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopic (XPS) and electrical conductivity measurements indicate that the breakaway of oxygen functional groups on/in the GO sheets at high temperature and the in-situ pyrolysis of CuPc molecules in the interlayer of graphene sheets synergistically facilitate the restoration of GO in graphitization, the effective nitrogen doping by replacing carbon atoms in graphene frameworks, the retention of layer-by-layer stacking structure of graphene sheets in plane and the formation of interlayer voids, leading to the enhancement in the electrical conductivity (3...
June 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28640581/molecular-insight-of-water-desalination-across-multilayer-graphene-oxide-membranes
#15
Bo Chen, Haifeng Jiang, Xiang Liu, Xuejiao Hu
Transport of ionic solutions through graphene oxide (GO) membranes is a complicated issue because the complex and tortuous structure inside make it very hard to clarify. Using molecular dynamics (MD) simulations, we investigated the mechanism of water transport and ions movement across the multilayer graphene oxide. The significant flow rate is considerably influenced by the structural parameters of GO membranes. Due to the size effect on shrunken real flow area, there is disagreement between classical continuum model and nano-scaled flow...
June 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28640294/space-confined-synthesis-of-multilayer-cu-n-doped-graphene-nanosheets-for-efficient-oxygen-electroreduction
#16
Yangyang Ni, Zhengyan Chen, Fantao Kong, Yu Qiao, Aiguo Kong, Yongkui Shan
Cu-based carbon electrocatalysts for the oxygen reduction reaction are difficult to compare with the corresponding Fe- or Co-based electrocatalytic materials, owing to their insufficient catalytic activity and stability. Herein, as an impressive Cu-based electrocatalyst, a multilayer Cu-N-doped graphene sheet (Cu-N-GR) is directly synthesized by the thermal conversion of copper(ii) 2,2'-bipyridine in the confined space of lamellar montmorillonites. The open layered morphology of Cu-N-GR materials facilitated the exposure of more active centers and enhanced the flexibility and mobility of charge carriers...
June 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28639636/hyperbolic-metamaterials-for-dispersion-assisted-directional-light-emission
#17
Lorenzo Ferrari, Joseph Stephen Thomas Smalley, Yeshaiahu Fainman, Zhaowei Liu
A novel method is presented to outcouple high spatial frequency (large-k) waves from hyperbolic metamaterials (HMMs) without the use of a grating. This approach relies exclusively on dispersion engineering, and enables preferential power extraction from the top or from the side of a HMM. Multilayer (ML) HMMs are shown to be better suited for lateral outcoupling, while nanowire HMMs are the most convenient choice for top outcoupling. A 6-fold increase in laterally extracted power is predicted for a dipole-HMM system with a Ag/Si ML operating at λ = 530 nm, when metallic filling ratio is changed from an unoptimized to the optimized one...
June 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28639563/the-role-of-apical-contractility-in-determining-cell-morphology-in-multilayered-epithelial-sheets-and-tubes
#18
Rui Zhen Tan, Tanny Lai, Keng-Hwee Chiam
A multilayered epithelium is made up of individual cells that are stratified in an orderly fashion, layer by layer. In such tissues, individual cells can adopt a wide range of shapes ranging from columnar to squamous. From histological images, we observe that, in flat epithelia such as the skin, the cells in the top layer are squamous while those in the middle and bottom layers are columnar, whereas in tubular epithelia, the cells in all layers are columnar. We develop a computational model to understand how individual cell shape is governed by the mechanical forces within multilayered flat and curved epithelia...
June 22, 2017: Physical Biology
https://www.readbyqxmd.com/read/28639401/van-der-waals-epitaxial-growth-of-atomic-layered-hfs2-crystals-for-ultrasensitive-near-infrared-phototransistors
#19
Lei Fu, Feng Wang, Bin Wu, Nian Wu, Wei Huang, Hanlin Wang, Chuanhong Jin, Lin Zhuang, Jun He, Lei Fu, Yunqi Liu
As a member of the group IVB transition metal dichalcogenides (TMDs) family, hafnium disulfide (HfS2 ) is recently predicted to exhibit higher carrier mobility and higher tunneling current density than group VIB (Mo and W) TMDs. However, the synthesis of high-quality HfS2 crystals, sparsely reported, has greatly hindered the development of this new field. Here, a facile strategy for controlled synthesis of high-quality atomic layered HfS2 crystals by van der Waals epitaxy is reported. Density functional theory calculations are applied to elucidate the systematic epitaxial growth process of the S-edge and Hf-edge...
June 22, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28639300/multiparametric-mri-of-the-breast-a-review
#20
REVIEW
Maria Adele Marino, Thomas Helbich, Pascal Baltzer, Katja Pinker-Domenig
During their development, cancers acquire several functional capabilities, which are defined as the hallmarks of cancer. For a deeper understanding of the hallmarks of cancer, and, consequently, improved personalized patient care, diagnostic tests must be multilayered and complex to identify the relevant underlying processes of cancer development and progression. In this context, magnetic resonance imaging (MRI) has emerged as an exceptionally powerful, versatile, and precise imaging technique. MRI of the breast is an essential tool in breast imaging, with multiple indications...
June 22, 2017: Journal of Magnetic Resonance Imaging: JMRI
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