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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
#1
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
https://www.readbyqxmd.com/read/30013969/effects-of-zirconium-doping-into-a-monoclinic-scheelite-bivo-4-crystal-on-its-structural-photocatalytic-and-photoelectrochemical-properties
#2
Shigeru Ikeda, Takato Kawaguchi, Yui Higuchi, Naoto Kawasaki, Takashi Harada, Mikas Remeika, Muhammad M Islam, Takeaki Sakurai
Effects of zirconium (Zr) doping into BiVO4 powder on its structural properties and photocatalytic activity for O2 evolution were examined. The formation of BiVO4 powder crystallized in a monoclinic scheelite structure ( ms -BiVO4 ) was achieved when the sample was doped with a relatively small amount of Zr. The photocatalytic activity of Zr-doped ms -BiVO4 powder was much higher than that of non-doped ms -BiVO4 . However, further doping caused a reduction of photocatalytic activity for O2 evolution due to the occurrence of structural alterations into tetragonal scheelite and tetragonal zircon structures...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/30011914/loosening-monitoring-of-the-threaded-pipe-connection-using-time-reversal-technique-and-piezoceramic-transducers
#3
Yabin Liang, Qian Feng, Dongsheng Li
Threaded pipe connections are commonly used in the oil and gas industry in particular to connect casting strings, drill pipe strings, production and transportation risers, and pipelines. As the most critical components in the entire chain, maintaining a sealed and secure connection while being subjected to environmental loads and pollution is very important and necessary to reduce potential leakage risk and guarantee the safety of the entire chain. In this paper, an effective approach using time reversal technique and lead zirconate titanate (PZT) transducer was developed to monitor the looseness of the threaded pipe connection...
July 14, 2018: Sensors
https://www.readbyqxmd.com/read/29994063/direct-write-laser-greyscale-lithography-for-multi-layer-lead-zirconate-titanate-thin-films
#4
Robert R Benoit, Delaney M Jordan, Gabriel L Smith, Ronald G Polcawich, Sarah S Bedair, Daniel M Potrepka
Direct-write laser greyscale lithography has been used to facilitate a single step patterning technique for multi-layer lead zirconate titanate (PZT) thin films. A 2.55 μm thick photoresist was patterned with a direct-write laser. The intensity of the laser was varied to create both tiered and sloped structures that are subsequently transferred into multi-layer PZT(52/48) stacks using a single Ar ion mill etch. Traditional processing requires a separate photolithography step and an ion mill etch for each layer of the substrate, which can be costly and time consuming...
March 9, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29993379/influence-of-compositional-variation-on-the-electrical-properties-of-pb-zn-1-3-nb-2-3-o-3-pb-zr-ti-o-3-ceramics-and-their-transducer-application
#5
Mustafa Yunus Kaya, Ebru Mensur-Alkoy, Aysel Gurbuz, Mehmet Oner, Sedat Alkoy
The ternary system of x[Pb(Zn1/3 Nb2/3 O3 . ( )[Pb(Zry Ti1-y )O3 ] composition with " " varying from 0.1 to 0.6 with interval of 0.1 and " " varying from 0.46 to 0.52 with interval of 0.01 was studied. The main objective was to maximize the dielectric and electromechanical properties through compositional variation and then to establish the full property matrix of the optimized composition for further analysis and device applications. Ceramics with pure perovskite phase have been produced in the entire compositional range that was investigated...
July 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/29989790/a-porous-scandia-stabilized-zirconia-layer-for-enhanced-performance-of-reversible-solid-oxide-cells
#6
Muhammad Shirjeel Khan, Xiaoyong Xu, Ruth Knibbe, Zhonghua Zhu
Reversible solid oxide cells (RSOCs) developed so far display short-term stability during solid oxide electrolysis cell (SOEC) mode. This is due to the delamination of the strontium doped lanthanum manganite (LSM) air electrode when tested for a long time. Here, we report a highly stable RSOC operation of LSM for 5 cycles using half and full cells. A scandia-stabilized zirconia (SSZ) porous layer was applied between the dense SSZ electrolyte and the porous LSM electrode. The half-cells were tested under ±0...
July 10, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29986584/water-vapor-assisted-universal-non-matrix-matched-analytical-method-for-the-in-situ-u-pb-dating-of-zircon-monazite-titanite-and-xenotime-by-la-icp-ms
#7
Tao Luo, Zhaochu Hu, Wen Zhang, Yongsheng Liu, Keqing Zong, Lian Zhou, Junfeng Zhang, Shenghong Hu
The U-Pb geochronologic analysis of accessory minerals has played an important role in Earth and solar system science in constraining the ages of a wide variety of rocks and minerals. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is one of the most popular techniques for U-Pb geochronologic analysis. Currently, the significant matrix effects observed between different accessory minerals and the lack of high-quality standards for many minerals of interest are the major limitations of its geochronological applications...
July 10, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29986544/a-novel-damage-indicator-based-on-the-electromechanical-impedance-principle-for-structural-damage-identification
#8
Pin Zhou, Dansheng Wang, Hongping Zhu
This paper presents a novel structural damage detection indicator, i.e., fourth-order voltage statistical moment (FVSM) based on the electromechanical impedance (EMI) principle, and then proposes a two-step damage detection method based on the novel indicator and a differential evolution algorithm (DEA). In this study, several lead zirconate titanate (PZT) sensors bonded to an experimental steel beam were utilized to acquire the time-domain voltage responses. On this basis, the fourth-order voltage statistical moments (FVSMs) of the voltage responses are computed to locate the damage element in the detected structure, and the proposed damage detection method is utilized to quantify the damage...
July 8, 2018: Sensors
https://www.readbyqxmd.com/read/29978704/voltage-controlled-bistable-thermal-conductivity-in-suspended-ferroelectric-thin-film-membranes
#9
Brian M Foley, Margeaux Wallace, John Thomas Gaskins, Elizabeth A Paisley, Raegan L Johnson-Wilke, Jong-Woo Kim, Philip J Ryan, Susan Trolier-McKinstry, Patrick E Hopkins, Jon Ihlefeld
Ferroelastic domain walls in ferroelectric materials possess two properties known to affect phonon transport: a change in crystallographic orientation and a lattice strain. Changing populations and spacing of nanoscale-spaced ferroelastic domain walls leads to manipulation of phonon scattering rates enabling control of thermal conduction at ambient temperatures. In the present work, lead zirconate titanate (PZT) thin film membrane structures were fabricated to reduce mechanical clamping to the substrate and enable a subsequent increase in ferroelastic domain wall mobility...
July 6, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29978165/new-monolayer-ternary-in-containing-sesquichalcogenides-biinse-3-sbinse-3-biinte-3-and-sbinte-3-with-high-stability-and-extraordinary-piezoelectric-properties
#10
Huabing Yin, Guang-Ping Zheng, Yuanxu Wang, Bingjian Yao
Looking for the high-performance alternatives to conventional lead-containing piezoelectric materials such as lead zirconate titanate (PZT) is absolutely vital for the development of low-dimensional innovative piezoelectric devices. Herein, we present our first-principles calculations on several new monolayers consisting of ternary In-containing sesquichalcogenides, which exhibit high stability and extraordinary piezoelectric properties. Our calculations predict that the in-plane (d11) and out-of-plane (d31) piezoelectric coefficients of BiInSe3, SbInSe3, BiInTe3, and SbInTe3 monolayers are much larger than those of most previously reported two-dimensional (2D) materials and widely studied wurtzite-type bulk piezoelectrics...
July 6, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29965723/combined-modification-of-dual-phase-li4ti5o12-tio2-by-lithium-zirconates-to-optimize-rate-capabilities-and-cyclability
#11
Jian-Ping Han, Bo Zhang, Li-Ying Wang, Yong-Xin Qi, Huiling Zhu, Gui-Xia Lu, Long-Wei Yin, Hui Li, Ning Lun, Yu-Jun Bai
The low electrical conductivity and ordinary lithium ion transfer capability of Li4Ti5O12 (LTO) restrict its application to some degree. In this work, dual-phase Li4Ti5O12-TiO2 (LTOT) was modified by composite zirconates of Li2ZrO3, Li6Zr2O7 (LZO) to boost the rate capabilities and cyclability. When the homogeneous mixture of LiNO3, Zr(NO3)4•5H2O and LTOT was roasted at 700 ºC for 5h, the obtained composite achieved a superior reversible capacity of 183.2 mAh g-1 to the pure Li4Ti5O12 after cycling at 100 mA g-1 for 100 times due to the existence of a scrap of TiO2...
July 2, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29954505/negative-capacitance-fin-field-effect-transistor-beyond-the-7-nm-node
#12
Kuan-Ting Chen, Yu-Yan Qiu, Ming Tang, Chia-Feng Lee, Yi-Lu Dai, Min-Hung Lee, Shu-Tong Chang
In this paper, we investigate the negative-capacitance fin field-effect (NC-FinFET) and extend the design beyond the 7-nm technology node. A 7-nm-node NC-FinFET is presented using the Landau-Khalatnikov equation and the physical equations of a 3D technology computer-aided design simulation. We propose a new NC-FinFET with double ferroelectric hafnium zircon dioxide layers. This device exhibits noticeable voltage gains in the sub-threshold region, can decrease subthreshold swing (SS) effectively, has a wide-ranged uniform SS lower than 60 mV/dec, and can downscale the threshold voltage without increasing the off current...
October 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29954126/high-dynamic-micro-vibrator-with-integrated-optical-displacement-detector-for-in-situ-self-calibration-of-mems-inertial-sensors
#13
Yi-Jia Du, Ting-Ting Yang, Dong-Dong Gong, Yi-Cheng Wang, Xiang-Yu Sun, Feng Qin, Gang Dai
The scale factor drifts and other long-term instability drifts of Micro-Electro-Mechanical System (MEMS) inertial sensors are the main contributors of the position and orientation errors in high dynamic environments. In this paper, a novel high dynamic micro vibrator, which could provide high acceleration and high angular rate rotation with integrated optical displacement detector, is proposed. Commercial MEMS inertial sensors, including 3-axis accelerometer and 6-axis inertial measurement unit which is about 3 mm * 3 mm * 1 mm with 19 mg, could be bonded on the vibration platform of the micro vibrator to perform in-situ during the self-calibration procedure...
June 27, 2018: Sensors
https://www.readbyqxmd.com/read/29950620/evidence-for-extremely-rapid-magma-ocean-crystallization-and-crust-formation-on-mars
#14
Laura C Bouvier, Maria M Costa, James N Connelly, Ninna K Jensen, Daniel Wielandt, Michael Storey, Alexander A Nemchin, Martin J Whitehouse, Joshua F Snape, Jeremy J Bellucci, Frédéric Moynier, Arnaud Agranier, Bleuenn Gueguen, Maria Schönbächler, Martin Bizzarro
The formation of a primordial crust is a critical step in the evolution of terrestrial planets but the timing of this process is poorly understood. The mineral zircon is a powerful tool for constraining crust formation because it can be accurately dated with the uranium-to-lead (U-Pb) isotopic decay system and is resistant to subsequent alteration. Moreover, given the high concentration of hafnium in zircon, the lutetium-to-hafnium (176 Lu-176 Hf) isotopic decay system can be used to determine the nature and formation timescale of its source reservoir1-3 ...
June 2018: Nature
https://www.readbyqxmd.com/read/29944691/new-sims-u-pb-age-constraints-on-the-largest-lake-transgression-event-in-the-songliao-basin-ne-china
#15
Dangpeng Xi, Huaiyu He, Zhiqiang Yu, Qinghua Huang, Jianfang Hu, Yankang Xu, Zhongye Shi, Zuohuan Qin, Xiaoqiao Wan
The largest lake transgression event (LTE) associated with lake anoxic events (LAE) and periodic seawater incursion events (SWIE) in the Songliao Basin, northeastern China, occurred during deposition of the Cretaceous Nenjiang Formation. The Yaojia-Nenjiang Formation boundary (YNB) marks the beginning of the LTE, as well as LAE and SWIE. However, there is an absence of direct radioisotopic dating, and therefore the age of the YNB, as well as the beginning of LTE, together with their relationship with other geological events, is strongly debated...
2018: PloS One
https://www.readbyqxmd.com/read/29934553/uplift-and-denudation-in-the-continental-area-of-china-linked-to-climatic-effects-evidence-from-apatite-and-zircon-fission-track-data
#16
Nansheng Qiu, Shuai Liu
Approximately 2284 fission track data were collected to draw a fission track thermotectonic image of the continental area of China. The result exhibits features such that apatite fission track ages increase from the southwestern to eastern and northern continental areas of China. Thermal paths also reveal the different uplift/denudation processes and times between different tectonic units. At the same time, tectonic uplift of the continent has been among the causes of climate change in the continent since the Cenozoic...
June 22, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29934550/precisely-dating-the-frasnian-famennian-boundary-implications-for-the-cause-of-the-late-devonian-mass-extinction
#17
L M E Percival, J H F L Davies, U Schaltegger, D De Vleeschouwer, A-C Da Silva, K B Föllmi
The Frasnian-Famennian boundary records one of the most catastrophic mass extinctions of the Phanerozoic Eon. Several possible causes for this extinction have been suggested, including extra-terrestrial impacts and large-scale volcanism. However, linking the extinction with these potential causes is hindered by the lack of precise dating of either the extinction or volcanic/impact events. In this study, a bentonite layer in uppermost-Frasnian sediments from Steinbruch Schmidt (Germany) is re-analysed using CA-ID-TIMS U-Pb zircon geochronology in order to constrain the date of the Frasnian-Famennian extinction...
June 22, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29930999/high-energy-density-in-pvdf-nanocomposites-using-an-optimized-nanowire-array
#18
Ru Guo, Hang Luo, Weiwei Liu, Xuefan Zhou, Lin Tang, Kechao Zhou, Dou Zhang
TiO2 nanowire arrays are often utilized to prepare high performance polymer nanocomposites, however, the contribution to the energy density is limited due to their non-ferroelectric characteristics. A nanocomposite with an optimized nanowire array combining the ferroelectric properties of lead zirconate titanate (PZT) with TiO2, readily forming nanowires (denoted as a TiO2-P nanowire array), is prepared to enhance the permittivity. Poly(vinylidene fluoride) (PVDF) is used as the polymer matrix due to its high breakdown strength, e...
June 22, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29909613/discovery-of-an-antiperovskite-ferroelectric-in-ch-3-3-nh-3-mnbr-3-mnbr-4
#19
Zhenhong Wei, Wei-Qiang Liao, Yuan-Yuan Tang, Peng-Fei Li, Ping-Ping Shi, Hu Cai, Ren-Gen Xiong
It is known that perovskites with the general chemical formula of ABX3 (A, B = cations, X = anion) have been intensively studied over the last half century because of their diverse functional properties, such as ferroelectricity in BaTiO3 , piezoelectricity in PZT (lead zirconate titanate), and recently developed photovoltaic properties in CH3 NH3 PbI3 . However, rather less attention has been paid to their "inverse" analogs, antiperovskites, which have a chemical formula X3 BA, where A and B are anions and X is a cation...
June 19, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29906270/effect-of-different-esthetic-post-core-materials-on-color-of-direct-composite-restorations-a-preliminary-clinical-study
#20
Buket Ayna, Berivan D Yılmaz, Bozan S Izol, Emrah Ayna, İbrahim Halil Tacir
BACKGROUND The purpose of this study was to determine the influence of 2 different esthetic post materials on the final color of direct-composite restorations by using a digital technique under in vivo conditions. MATERIAL AND METHODS We included 22 pulpless incisor teeth treated with conventionally cemented zirconia (n=11) and polyethylene fiber (n=11) posts in the study. Teeth were restored with a hybrid resin. The color of direct-composite restorations and contralateral control teeth was measured using a digital technique...
June 15, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
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