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Juri Barthel, Markus Lentzen, Andreas Thust
We investigate a possible dependence between the applied electron dose-rate and the magnitude of the resulting image contrast in HRTEM of inorganic crystalline objects. The present study is focussed on the question whether electron irradiation can induce excessively strong atom vibrations or displacements, which in turn could significantly reduce the resulting image contrast. For this purpose, high-resolution images of MgO, Ge, and Au samples were acquired with varying dose rates using a CS-corrected FEI Titan 80-300 microscope operated at 300kV accelerating voltage...
November 22, 2016: Ultramicroscopy
Federico Romano, Francesco Legge, Giovanni Scambia, Maurizio Guido
STUDY OBJECTIVE: To evaluate the feasibility, efficacy and safeness of nerve-sparing laparoscopic colposacropexy performed with a minimally invasive approach by using 2,9 mm Percuvance(TM) Percutaneous Surgical System (PSS) (The Percuvance(TM) System, Teleflex Inc., USA). DESIGN: Step-by-step video demonstration of the surgical technique. The Internal Department Committee approved this study. The patient was adequately informed about the possible risks and benefits of this experimental technique and a written consent agreeing to undergo the described procedure was signed...
December 2, 2016: Journal of Minimally Invasive Gynecology
Nidal W Elshereksi, Mariyam J Ghazali, Andanastuti Muchtar, Che H Azhari
OBJECTIVES: This study aimed to fabricate and characterise silanated and titanated nanobarium titanate (NBT) filled poly(methyl methacrylate) (PMMA) denture base composites and to evaluate the behaviour of a titanate coupling agent (TCA) as an alternative coupling agent to silane. The effect of filler surface modification on fracture toughness was also studied. METHODS: Silanated, titanated and pure NBT at 5% were incorporated in PMMA matrix. Neat PMMA matrix served as a control...
December 1, 2016: Journal of Dentistry
Almonir Abdulgader Mansour, Thottam S Kalkur
A switchable and tunable bulk acoustic wave (BAW) duplexer for RF applications is presented in this paper. The fabricated BAW duplexer was built on sapphire substrate using solidly mounted resonators. A metal-organic solution deposition technique was used to form resonators with barium strontium titanate (BST) thin film and six layers of silicon dioxide and tantalum oxide as Bragg reflector. By applying dc bias, the BST thin film shows an electrostrictive effect, and the two filter paths of the BAW duplexer switch to a bandpass response with center frequencies at 4...
December 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
J F Seely, L T Hudson, Albert Henins, U Feldman
A Cauchois transmission-crystal spectrometer has been developed with high crystal resolving power in the 6 keV-15 keV energy range and sufficient sensitivity to record single-shot spectra from the Lawrence Livermore National Laboratory (LLNL) Titan laser and other comparable or more energetic lasers. The spectrometer capabilities were tested by recording the W L transitions from a laboratory source and the extended x-ray absorption fine structure (EXAFS) spectrum through a Cu foil.
November 2016: Review of Scientific Instruments
M Gauthier, J B Kim, C B Curry, B Aurand, E J Gamboa, S Göde, C Goyon, A Hazi, S Kerr, A Pak, A Propp, B Ramakrishna, J Ruby, O Willi, G J Williams, C Rödel, S H Glenzer
We report on the successful operation of a newly developed cryogenic jet target at high intensity laser-irradiation. Using the frequency-doubled Titan short pulse laser system at Jupiter Laser Facility, Lawrence Livermore National Laboratory, we demonstrate the generation of a pure proton beam a with maximum energy of 2 MeV. Furthermore, we record a quasi-monoenergetic peak at 1.1 MeV in the proton spectrum emitted in the laser forward direction suggesting an alternative acceleration mechanism. Using a solid-density mixed hydrogen-deuterium target, we are also able to produce pure proton-deuteron ion beams...
November 2016: Review of Scientific Instruments
Ahmed Allam, Adel Elsabbagh, Wael Akl
A two-dimensional active acoustic metamaterial with controllable anisotropic density is introduced. The material consists of composite lead-lead zirconate titanate plates clamped to an aluminum structure with air as the background fluid. The effective anisotropic density of the material is controlled, independently for two orthogonal directions, by means of an external static electric voltage signal. The material is used in the construction of a reconfigurable waveguide capable of controlling the direction of the acoustic waves propagating through it...
November 2016: Journal of the Acoustical Society of America
Peter Girouard, Zhifu Liu, Pice Chen, Young Kyu Jeong, Yongming Tu, Seng-Tiong Ho, Bruce W Wessels
We report a photonic crystal (PhC) optical modulator operating in the optical C band (1530-1565 nm) using barium titanate epitaxial thin films as the electro-optic (EO) medium. The PhC has hexagonal lattice symmetry and an extinction ratio of 9 dB. Due to the slow light enhancement of the EO coefficient near the PhC band edge, the driving electrode can be as short as a one millimeter. We report for the first time, to the best of our knowledge, at microwave frequencies from 10 to 45 GHz the effective EO coefficient and its enhancement through slow light effects...
December 1, 2016: Optics Letters
R Aimard, C Lalloué, C Ho Quoc, D Girodet, P Zrounba, E Delay
INTRODUCTION: The mucosal cylindroma or adenoid cystic carcinoma is the second sinonasal non-epithelial malignant tumor frequency argument. Due to the achievement of the nasal mucosa and a late diagnosis reconstructions are often complex. We report the case of a mucous cylindroma recurrence of nasal septum requiring a wide and deep excision of the root of the nose with nasal reconstruction. CASE REPORT: A patient aged 66 years whose history resection two years ago with a mucous adenoid cystic carcinoma of the right side of the nasal septum, had a local recurrence T2NOM0 imposing a wide excision with amputation nasal septum own bones of nose, the anterior portion of the triangular cartilages...
November 25, 2016: Annales de Chirurgie Plastique et Esthétique
Víctor Parro, Yolanda Blanco, Fernando Puente-Sánchez, Luis A Rivas, Mercedes Moreno-Paz, Alex Echeverría, Guillermo Chong-Díaz, Cecilia Demergasso, Nathalie A Cabrol
Oligotrophic glacial lakes in the Andes Mountains serve as models to study the effects of climate change on natural biological systems. The persistent high UV regime and evolution of the lake biota due to deglaciation make Andean lake ecosystems potential analogues in the search for life on other planetary bodies. Our objective was to identify microbial biomarkers and metabolic patterns that represent time points in the evolutionary history of Andean glacial lakes, as these may be used in long-term studies as microscale indicators of climate change processes...
November 28, 2016: Astrobiology
You-Lin Tu, Shih-Jui Chen, Yean-Ren Hwang
In this paper, acoustic tweezers which use beam forming performed by a Fresnel zone plate are proposed. The performance has been demonstrated by finite element analysis, including the acoustic intensity, acoustic pressure, acoustic potential energy, gradient force, and particle distribution. The acoustic tweezers use an ultrasound beam produced by a lead zirconate titanate (PZT) transducer operating at 2.4 MHz and 100 Vpeak-to-peak in a water medium. The design of the Fresnel lens (zone plate) is based on air reflection, acoustic impedance matching, and the Fresnel half-wave band (FHWB) theory...
November 23, 2016: Sensors
A Cafarelli, A Verbeni, A Poliziani, P Dario, A Menciassi, L Ricotti
: Materials with tailored acoustic properties are of great interest for both the development of tissue-mimicking phantoms for ultrasound tests and smart scaffolds for ultrasound mediated tissue engineering and regenerative medicine. In this study, we assessed the acoustic properties (speed of sound, acoustic impedance and attenuation coefficient) of three different materials (agarose, polyacrylamide and polydimethylsiloxane) at different concentrations or cross-linking levels and doped with different concentrations of barium titanate ceramic nanoparticles...
November 21, 2016: Acta Biomaterialia
Haiqiang Wang, Penglu Wang, Xiongbo Chen, Zhongbiao Wu
In this work, protonated titanate nanotubes was performed as a potential useful support and different vanadium precursors (NH4VO3 and VOSO4) were used to synthesize deNOx catalysts. The results showed that VOSO4 exhibited better synergistic effect with titanate nanotubes than NH4VO3, which was caused by the ion-exchange reaction. Then high loading content of vanadium, uniformly active phase distribution, better dispersion of vanadium, more acid sites, better V(5+)/V(4+) redox cycles and superior oxygen mobility were achieved...
November 9, 2016: Journal of Hazardous Materials
Sean Taylor, Alexander Samokhvalov
Alkaline earth metal titanates are broad bandgap semiconductors with applications in electronic devices, as catalysts, photocatalysts, sorbents, and sensors. Strontium titanate SrTiO3 is of interest in electronic devices, sensors, in the photocatalytic hydrogen generation, as catalyst and sorbent. Both photocatalysis and operation of electronic devices rely upon the pathways of relaxation of excited charge in the semiconductor, including relaxation through the midgap states. We report characterization of nanocrystalline SrTiO3 at room temperature by "conventional" vs...
November 13, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Almonir Mansour, Thottam Kalkur
This paper presents the design, fabrication and experimental evaluation of switchable and tunable thin film bulk acoustic wave (BAW) resonators and filters with MOSD deposited BST for radio frequency (RF) applications. The switchability and tunability of these devices come from utilizing the electrostrictive effect of ferroelectric materials such as barium strontium titanate (BST) with the application of an external dc bias voltage. The BAW resonators and filters in this paper were fabricated on high resistivity silicon substrate as solidly mounted resonator (SMR) structure with eight layers of silicon dioxide and tantalum oxide as a Bragg reflector...
November 18, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Ralph D Lorenz, Nathalie A Cabrol
A scale model of the proposed Titan Mare Explorer capsule was deployed at the Planetary Lake Lander field site at Laguna Negra, Chile. The tests served to calibrate models of wind-driven drift of the capsule and to understand its attitude motion in the wave field, as well as to identify dynamic and acoustic signatures of shoreline approach. This information enables formulation of onboard trigger criteria for near-shore science data acquisition. Key Words: Titan-Vehicle dynamics-Science autonomy-Lake. Astrobiology 17, xxx-xxx...
November 21, 2016: Astrobiology
Danious Pratheep Sounthararajah, Paripurnanda Loganathan, Jayakumar Kandasamy, Saravanamuthu Vigneswaran
Permeable pavement systems (PPS) are a widely-used treatment measure in sustainable stormwater management and groundwater recharge. However, PPS are not very efficient in removing heavy metals from stormwater. A pilot scale study using zeolite or basalt as bed material in PPS removed 41-72%, 67-74%, 38-43%, 61-72%, 63-73% of Cd, Cu, Ni, Pb, and Zn, respectively, from synthetic stormwater (pH 6.5; Cd, Cu, Ni, Pb, and Zn concentrations of 0.04, 0.6, 0.06, 1.0, and 2.0 mg L(-1), respectively) over a period of 80 h...
November 14, 2016: Chemosphere
Giedrius Janusas, Sigita Ponelyte, Alfredas Brunius, Asta Guobiene, Andrius Vilkauskas, Arvydas Palevicius
With increasing technical requirements in the design of microresonators, the development of new techniques for lightweight, simple, and inexpensive components becomes relevant. Lead zirconate titanate (PZT) is a powerful tool in the formation of these components, allowing a self-actuation or self-sensing capability. Different fabrication methods lead to the variation of the properties of the device itself. This research paper covers the fabrication of a novel PZT film and the investigations of its chemical, surface, and dynamic properties when film thickness is varied...
November 10, 2016: Sensors
Yang-Yen Yu, Ai-Hua Jiang, Wen-Ya Lee
The organic material soluble polyimide (PI) and organic-inorganic hybrid PI-barium titanate (BaTiO3) nanoparticle dielectric materials (IBX, where X is the concentration of BaTiO3 nanoparticles in a PI matrix) were successfully synthesized through a sol-gel process. The effects of various BaTiO3 contents on the hybrid film performance and performance optimization were investigated. Furthermore, pentacene-based organic thin film transistors (OTFTs) with PI-BaTiO3/polymethylmethacrylate or cyclic olefin copolymer (COC)-modified gate dielectrics were fabricated and examined...
December 2016: Nanoscale Research Letters
Yan Li, Binrui Cao, Mingying Yang, Ye Zhu, Junghae Suh, Chuanbin Mao
Ferroelectric materials, such as tetragonal barium titanate (BaTiO3), have been widely used in a variety of areas including bioimaging, biosensing, and high power switching devices. However, conventional methods for the synthesis of tetragonal phase BaTiO3 usually require toxic organic reagents and high temperature treatments, and are thus not environment-friendly and energy-efficient. Here, we took advantage of the phage display technique to develop a novel strategy for the synthesis of BaTiO3 nanowires. We identified a short BaTiO3-binding/nucleating peptide, CRGATPMSC (named RS), from a phage-displayed random peptide library by biopanning technique and then genetically fused the peptide to the major coat protein (pVIII) of filamentous M13 phages to form the pVIII-RS phages...
November 1, 2016: ACS Applied Materials & Interfaces
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