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https://www.readbyqxmd.com/read/30229026/data-on-recovery-rates-and-external-morphologies-of-zircon-grains-from-mechanical-and-electrical-pulverization-of-rock-samples
#1
Mami Takehara, Kenji Horie, Tomokazu Hokada, Shoichi Kiyokawa
In this data article, we provide information on the recovery rate and scanning electron microscope (SEM) images of the external morphology of zircon grains separated from two rock samples (AS3 and TEMORA 2) using both mechanical and electrical pulverization systems. The data in this article are related to the research article entitled "New insight into disturbance of U-Pb and trace-element systems in hydrothermally altered zircon via SHRIMP analyses of zircon from the Duluth Gabbro" (Takehara et al...
August 2018: Data in Brief
https://www.readbyqxmd.com/read/30223502/a-feasibility-study-on-timber-moisture-monitoring-using-piezoceramic-transducer-enabled-active-sensing
#2
Jicheng Zhang, Yong Li, Yongshui Huang, Jinwei Jiang, Siu-Chun M Ho
In recent years, the piezoceramic transducer-enabled active sensing technique has been extensively applied to structural damage detection and health monitoring, in civil engineering. Being abundant and renewable, timber has been widely used as a building material in many countries. However, one of the more challenging applications of timber, in construction, is the potential damage caused by moisture. Increased moisture may cause easier warping of timber components and encourage corrosion of integrated metal members, on top of potentially causing rot and decay...
September 14, 2018: Sensors
https://www.readbyqxmd.com/read/30221836/detrimental-effect-of-sintering-additives-on-conducting-ceramics-yttrium-doped-barium-zirconate
#3
Donglin Han, Shigeaki Uemura, Chihiro Hiraiwa, Masatoshi Majima, Tetsuya Uda
Y-doped BaZrO3 (BZY) is currently the most promising proton conductive ceramic-type electrolyte, showing perspective application in electrochemical devices, including fuel cells, electrolyzer cells. However, due to its refractory nature, sintering additives, such as NiO, CuO or ZnO was commonly added to reduce its high sintering temperature from 1600 oC to around 1400 oC. And even without deliberately adding the sintering additive, the NiO anode substrate provides another source of the sintering additive; that is, during the co-sintering process, NiO diffuses from the anode into the BZY electrolyte layer...
September 17, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30218039/late-pleistocene-glacial-transitions-in-north-america-altered-major-river-drainages-as-revealed-by-deep-sea-sediment
#4
Andrea Fildani, Angela M Hessler, Cody C Mason, Matthew P McKay, Daniel F Stockli
Sediment eroded from continents during ice ages can be rapidly (<104 years) transferred via rivers to the deep-sea and preserved in submarine fans, becoming a viable record of landscape evolution. We applied chemical weathering proxies and zircon geo-thermo-chronometry to late Pleistocene sediment recovered from the deep-sea Mississippi fan, revealing interactions between the Laurentide ice sheet (LIS) and broader Mississippi-Missouri catchment between ca. 70,000 and 10,000 years ago (70 to 10 ka). Sediment contribution from the Missouri catchment to the Mississippi fan was low between 70 and 30 ka but roughly doubled after the Last Glacial Maximum (LGM)...
September 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30197466/slow-long-term-exhumation-of-the-west-central-andean-plate-boundary-chile
#5
Nikita N Avdievitch, Todd A Ehlers, Christoph Glotzbach
We present a regional analysis of new low-temperature thermochronometer ages from the Central Andean fore arc to provide insights into the exhumation history of the western Andean margin. To derive exhumation rates over 10 million-year timescales, 38 new apatite and zircon (U-Th)/He ages were analyzed along six ~500-km long near-equal-elevation, coast parallel, transects in the Coastal Cordillera (CC) and higher-elevation Precordillera (PC) of the northern Chilean Andes between latitudes 18.5°S and 22.5°S...
July 2018: Tectonics
https://www.readbyqxmd.com/read/30189639/a-new-structural-health-monitoring-strategy-based-on-pzt-sensors-and-convolutional-neural-network
#6
Mario A de Oliveira, Andre V Monteiro, Jozue Vieira Filho
Preliminaries convolutional neural network (CNN) applications have recently emerged in structural health monitoring (SHM) systems focusing mostly on vibration analysis. However, the SHM literature shows clearly that there is a lack of application regarding the combination of PZT-(lead zirconate titanate) based method and CNN. Likewise, applications using CNN along with the electromechanical impedance (EMI) technique applied to SHM systems are rare. To encourage this combination, an innovative SHM solution through the combination of the EMI-PZT and CNN is presented here...
September 5, 2018: Sensors
https://www.readbyqxmd.com/read/30189629/application-of-pzt-technology-and-clustering-algorithm-for-debonding-detection-of-steel-uhpc-composite-slabs
#7
Banfu Yan, Qiqi Zou, You Dong, Xudong Shao
A lightweight composite bridge deck system composed of steel orthotropic deck stiffened with thin Ultra-High Performance Concrete (UHPC) layer has been proposed to eliminate fatigue cracks in orthotropic steel decks. The debonding between steel deck and UHPC layer may be introduced during construction and operation phases, which could cause adverse consequences, such as crack-induced water invasion and distinct reduction of the shear resistance. The piezoelectric lead zirconate titanate (PZT)-based technologies are used to detect interfacial debonding defects between the steel deck and the UHPC layer...
September 5, 2018: Sensors
https://www.readbyqxmd.com/read/30156366/violet-blue-emission-property-of-the-cerium-ion-doped-cahfo-3-doping-and-temperature-dependence
#8
Seungmin Lee, Junhwi Lim, Y S Lee
We investigated the emission property of perovskite CaHfO3 polycrystals with various concentrations of cerium ion (Ce3+ ). With a wide range of UV photoexcitation, we observed a strong emission near 430 nm which should originate from 5d-4f transitions in the Ce3+ ions. Combining these emission spectra with the photoluminescence excitation spectra, we estimated the Stokes shift to be 6700 cm-1 , irrespective of the Ce3+ ion doping concentration. We found that the violet-blue emissions in Ce3+ ions showed non-trivial temperature dependence in their peak position and intensity...
August 29, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/30150780/experimental-evidence-for-the-preservation-of-u-pb-isotope-ratios-in-mantle-recycled-crustal-zircon-grains
#9
Fernando Bea, Pilar Montero, Jose Francisco Molina Palma
Zircon of crustal origin found in mantle-derived rocks is of great interest because of the information it may provide about crust recycling and mantle dynamics. Consideration of this requires understanding of how mantle temperatures, notably higher than zircon crystallization temperatures, affected the recycled zircon grains, particularly their isotopic clocks. Since Pb2+ diffuses faster than U4+ and Th+4 , it is generally believed that recycled zircon grains lose all radiogenic Pb after a few million years, thus limiting the time range over which they can be detected...
August 27, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30150757/nanophotonic-pockels-modulators-on-a-silicon-nitride-platform
#10
Koen Alexander, John P George, Jochem Verbist, Kristiaan Neyts, Bart Kuyken, Dries Van Thourhout, Jeroen Beeckman
Silicon nitride (SiN) is emerging as a competitive platform for CMOS-compatible integrated photonics. However, active devices such as modulators are scarce and still lack in performance. Ideally, such a modulator should have a high bandwidth, good modulation efficiency, low loss, and cover a wide wavelength range. Here, we demonstrate the first electro-optic modulators based on ferroelectric lead zirconate titanate (PZT) films on SiN, in both the O-band and C-band. Bias-free operation, bandwidths beyond 33 GHz and data rates of 40 Gbps are shown, as well as low propagation losses (α ≈ 1 dB cm-1 )...
August 27, 2018: Nature Communications
https://www.readbyqxmd.com/read/30143648/zircon-u-pb-geochronology-of-crystal-tuff-on-lingshan-island-and-its-geological-implications-for-magmatism-stratigraphic-age-and-geological-events
#11
Jindong Gao, Qiao Feng, Xiaoli Zhang, Lifa Zhou, Zunsheng Jiao, Yu Qin
Due to the unique location in the Ludong region, geochronological study of this area is essential for the understanding of the Cretaceous tectonic evolution of Eastern China. Sedimentary sequences interbedded with tuff layers unconformably overlay metamorphic rocks in the Sulu Orogen. This research presents a more reliable geochronological dataset of a tuff layer on Lingshan Island in Qingdao. A total of 103 valid age values from 216 zircon grains were obtained in three fresh tuff samples. Approximately 87% of these zircon ages are dated as the Early Cretaceous, and their peak ages shift from the Aptian stage to the Albian stage...
August 24, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30118205/transparent-antiradiative-ferroelectric-heterostructure-based-on-flexible-oxide-heteroepitaxy
#12
Chun-Hao Ma, Jie Jiang, Pao-Wen Shao, Qiang-Xiang Peng, Chun-Wei Huang, Ping-Chun Wu, Jyun-Ting Lee, Yu-Hong Lai, Din-Ping Tsai, Jyh-Ming Wu, Shen-Chuan Lo, Wen-Wei Wu, Yi-Chun Zhou, Po-Wen Chiu, Ying-Hao Chu
In the era of Internet of Things, the demand for flexible and transparent electronic devices has shifted to the forefront of materials science research. However, the radiation damage to key performance of transparent devices under radiative environment remains as a critical issue. Here, we present a promising technology for nonvolatile transparent electronic devices based on flexible oxide heteroepitaxy. A direct fabrication of epitaxial lead lanthanum zirconate titanate on transparent flexible mica substrate with indium tin oxide electrodes is presented...
September 12, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30110967/dielectric-properties-and-switching-processes-of-barium-titanate%C3%A2-barium-zirconate-ferroelectric-superlattices
#13
Alexander Sidorkin, Lolita Nesterenko, Yaovi Gagou, Pierre Saint-Gregoire, Eugeniy Vorotnikov, Nadezhda Popravko
This article is devoted to the investigation of the dielectric and repolarization properties of barium zirconate and barium titanate BaZrO₃/BaTiO₃ superlattices with a period of 13.322 nm on a monocrystal magnesium oxide (MgO) substrate. Synthesized superlattices demonstrated a ferroelectric phase transition at a temperature of approximately 393 °C, which is far higher than the Curie temperature of BaTiO₃ thin films and bulk samples. The dielectric permittivity of the superlattice reached more than 10⁴ at maximum...
August 14, 2018: Materials
https://www.readbyqxmd.com/read/30109064/a-long-forgotten-dinosaur-bone-from-a-museum-cabinet-uncovered-to-be-a-japan-s-iconic-extinct-mammal-paleoparadoxia-desmostylia-mammalia
#14
Kumiko Matsui, Yuri Kimura, Mitsuhiro Nagata, Hiroaki Inose, Kazuya Ikeda, Brian Lee Beatty, Hideyuki Obayashi, Takafumi Hirata, Shigeru Otoh, Tatsuya Shinmura, Sachiko Agematsu, Katsuo Sashida
Here, we report a new 'discovery' of a desmostylian fossil in the geological collection at a national university in Japan. This fossil was unearthed over 60 years ago and donated to the university. Owing to the original hand-written note kept with the fossil in combination with interview investigation, we were able to reach two equally possible fossil sites in the town of Tsuchiyu Onsen, Fukushima. Through the interviews, we learned that the fossil was discovered during construction of a debris flow barrier and that it was recognized as a 'dinosaur' bone among the locals and displayed in the Village Hall before/until the town experienced a fire disaster in 1954...
July 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/30104507/real-time-monitoring-of-bond-slip-between-gfrp-bar-and-concrete-structure-using-piezoceramic-transducer-enabled-active-sensing
#15
Kai Xu, Changchun Ren, Qingshan Deng, Qingping Jin, Xuemin Chen
Glass fiber-reinforced polymers (GFRPs) have received increasing attention in recent years due to their overall performance of light weight, low cost and corrosion resistance, and they are increasingly used as reinforcement in concrete structures. However, GFRP material has low elastic modulus and linear elastic properties compared with steel bars, which introduces different bonding characteristics between bars and concrete. Therefore, a reliable monitoring method is urgently needed to detect the bond slip in GFRP-reinforced concrete structures...
August 13, 2018: Sensors
https://www.readbyqxmd.com/read/30085483/effect-of-zirconia-pigmentation-on-translucency
#16
I Gomes, L P Lopes, M Fonseca, J Portugal
PURPOSE: the aim of this study was to investigate the effect of shading on translucency and mean grain size of three Zirconia systems (Lava Frame, Ice Zirkon Translucent and Prettau Zirkon). MATERIALS AND METHODS: specimens pigmented in A1, A4 and a non-pigmented specimen was evaluated with Scanning Electron Microscopy and spectrophotometery. RESULTS: the transmittance ranged between 0.18 and 0.52, in Ice Zirkon Translucent A4 and Prettau Zircon non-pigmented, respectively...
August 30, 2018: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/30072601/high-efficiency-output-pressure-performance-using-capacitive-micromachined-ultrasonic-transducers-with-substrate-embedded-springs
#17
Byung Chul Lee, Amin Nikoozadeh, Kwan Kyu Park, Butrus T Khuri-Yakub
Capacitive micromachined ultrasonic transducers (CMUTs) with substrate-embedded springs offer highly efficient output pressure performance over conventional CMUTs, owing to their nonflexural parallel plate movement. The embedded silicon springs support thick Si piston plates, creating a large nonflexural average volume displacement efficiency in the operating frequency range from 1⁻3 MHz. Static and dynamic volume displacements of the nonflexural parallel plates were examined using white light interferometry and laser Doppler vibrometry...
August 2, 2018: Sensors
https://www.readbyqxmd.com/read/30059299/ferroelastic-properties-of-pzt-characterization-under-compressive-and-tensile-stress-finite-element-simulation-and-lifetime-calculation
#18
Gunnar Picht, Valerie Bouvier, Stephan Frank, Jurij Koruza, Frank Felten, Gert Lindemann
Finite-element (FE) simulations, based on a phenomenological nonlinear constitutive model, were carried out to show the impact of ferroelastic switching on compressive and tensile loading of a soft and hard ferroelastic polycrystalline lead zirconate titanate ceramic (PbZr1-xTixO3, PZT). Hereby, a model assembly is used that simulates mechanical stresses generated by the contact of a ceramic element with a concave counterpart. In order to parameterize the constitutive model, the elastic and piezoelectric tensors are determined by the small signal resonance method and by the direct measurement under compressive/tensile loads...
September 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/30033262/comparative-investigation-of-porous-nano-hydroxyapaptite-chitosan-nano-zirconia-chitosan-and-novel-nano-calcium-zirconate-chitosan-composite-scaffolds-for-their-potential-applications-in-bone-regeneration
#19
Bipin Gaihre, Ambalangodage C Jayasuriya
Zirconium (Zr) based bioceramic nanoparticles, as the filler material to chitosan (CS), for the development of composite scaffolds are less studied compared to hydroxyapatite nanoparticles. This is predominantly due to the biological similarity of nano-hydroxyapatite (nHA; Ca10 (PO4 )6 (OH)2 ) with bone inorganic component. In this study, we compared the physical and biological properties of CS composite scaffolds hybridized with nHA, nano-zirconia (nZrO; ZrO2 ), and nano-calcium zirconate (nCZ; CaZrO3 ). For the first time in this study, the properties of CS-nCZ composite scaffolds have been reported...
October 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/30018191/multi-scale-stress-wave-simulation-for-aggregates-segregation-detection-of-concrete-core-in-circular-cfst-coupled-with-pzt-patches
#20
Hongbing Chen, Bin Xu, Yilung Mo, Tianmin Zhou
In this study, the numerical investigation of the detectability of concrete aggregate segregation in circular concrete-filled steel tubulars (CCFST) based on piezoelectric lead zirconate titanate (PZT) measurement is performed. The stress wave propagation in the concrete core of circular CCFST excited with a surface-mounted PZT actuator is studied with multi-scale and multi-physical field coupling analysis. The piezoelectric effect of PZT patches and its coupling effect with CFSTs are considered. Numerical concrete modeling technology is employed to construct the concrete core composed of randomly distributed aggregates with and without aggregate segregation at different levels, mortar, and an interfacial transition zone (ITZ)...
July 17, 2018: Materials
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