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https://www.readbyqxmd.com/read/29149725/a-method-for-the-design-of-ultrasonic-devices-for-scanning-acoustic-microscopy-using-impulsive-signals
#1
Mototaka Arakawa, Hiroshi Kanai, Kazuo Ishikawa, Ryo Nagaoka, Kazuto Kobayashi, Yoshifumi Saijo
Scanning acoustic microscopy (SAM) using impulsive signals is useful for characterization of biological tissues and cells. The operating center frequency of an ultrasonic device strongly depends on the performance characteristics of the device if the measurement is conducted by using impulsive signals. In this paper, a method for the design of ultrasonic devices for SAM using impulsive signals was developed. A new plane-wave model was introduced to calculate frequency characteristics of loss of ultrasonic devices by taking into account the conversion loss at the ultrasonic transducer, the transmission loss at the acoustic anti-reflection coating, and the propagation loss in the couplant...
November 2, 2017: Ultrasonics
https://www.readbyqxmd.com/read/29149695/rheo-optical-near-infrared-nir-spectroscopy-study-of-partially-miscible-polymer-blend-of-polymethyl-methacrylate-pmma-and-polyethylene-glycol-peg
#2
Hideyuki Shinzawa, Junji Mizukado
Tensile deformations of a partially miscible blend of polymethyl methacrylate (PMMA) and polyethylene glycol (PEG) is studied by a rheo-optical characterization near-infrared (NIR) technique to probe deformation behavior during tensile deformation. Sets of NIR spectra of the polymer samples were collected by using an acousto-optic tunable filter (AOTF) NIR spectrometer coupled with a tensile testing machine as an excitation device. While deformations of the samples were readily captured as strain-dependent NIR spectra, the entire feature of the spectra was overwhelmed with the baseline fluctuation induced by the decrease in the sample thickness and subsequent change in the light scattering...
November 11, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29149568/individual-atomic-imaging-of-multiple-dopant-sites-in-as-doped-si-using-spectro-photoelectron-holography
#3
Kazuo Tsutsui, Tomohiro Matsushita, Kotaro Natori, Takayuki Muro, Yoshitada Morikawa, Takuya Hoshii, Kuniyuki Kakushima, Hitoshi Wakabayashi, Kouichi Hayashi, Fumihiko Matsui, Toyohiko Kinoshita
The atomic scale characterization of dopant atoms in semiconductor devices to establish correlations with the electrical activation of these atoms is the essential to the advancement of contemporary semiconductor process technology. Spectro-photoelectron holography combined with first-principles simulations can determine the local three-dimensional atomic structures of dopant elements, which in turn affect their electronic states. In the work reported herein, this technique was used to examine arsenic (As) atoms doped into a silicon (Si) crystal...
November 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/29149545/mechanical-properties-in-metal-organic-frameworks-emerging-opportunities-and-challenges-for-device-functionality-and-technological-applications
#4
REVIEW
Nicholas C Burtch, Jurn Heinen, Thomas D Bennett, David Dubbeldam, Mark D Allendorf
Some of the most remarkable recent developments in metal-organic framework (MOF) performance properties can only be rationalized by the mechanical properties endowed by their hybrid inorganic-organic nanoporous structures. While these characteristics create intriguing application prospects, the same attributes also present challenges that will need to be overcome to enable the integration of MOFs with technologies where these promising traits can be exploited. In this review, emerging opportunities and challenges are identified for MOF-enabled device functionality and technological applications that arise from their fascinating mechanical properties...
November 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29149531/solution-adsorption-formation-of-a-%C3%AF-conjugated-polymer-graphene-composite-for-high-performance-field-effect-transistors
#5
Yun Liu, Wei Hao, Huiying Yao, Shuzhou Li, Yuchen Wu, Jia Zhu, Lei Jiang
Semiconducting polymers with π-conjugated electronic structures have potential application in the large-scale printable fabrication of high-performance electronic and optoelectronic devices. However, owing to their poor environmental stability and high-cost synthesis, polymer semiconductors possess limited device implementation. Here, an approach for constructing a π-conjugated polymer/graphene composite material to circumvent these limitations is provided, and then this material is patterned into 1D arrays...
November 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29149516/feasibility-of-percutaneous-left-atrial-appendage-closure-using-a-novel-lambre-occluder-in-patients-with-atrial-fibrillation-initial-results-from-a-prospective-cohort-registry-study
#6
Shaojie Chen, Boris Schmidt, Stefano Bordignon, Fabrizio Bologna, Takahiko Nagase, Nikolaos Tsianakas, Laura Perrotta, K R Julian Chun
BACKGROUND: The LAmbreۛ occluder is a novel device for percutaneous left atrial appendage closure (LAAC). The presented study aimed to report the initial experience in implantation of the novel LAmbre for LAAC in patients with non-valvular AF. METHODS: We conducted a prospective, observational, cohort registry study to evaluate the feasibility of percutaneous LAAC using the LAmbre occlude. RESULTS: Thirty patients (15 female, mean age 77...
November 17, 2017: Journal of Cardiovascular Electrophysiology
https://www.readbyqxmd.com/read/29149508/implementing-quantum-search-algorithm-with-metamaterials
#7
Weixuan Zhang, Kaiyang Cheng, Chao Wu, Yi Wang, Hongqiang Li, Xiangdong Zhang
Metamaterials, artificially structured electromagnetic (EM) materials, have enabled the realization of many unconventional EM properties not found in nature, such as negative refractive index, magnetic response, invisibility cloaking, and so on. Based on these man-made materials with novel EM properties, various devices are designed and realized. However, quantum analog devices based on metamaterials have not been achieved so far. Here, metamaterials are designed and printed to perform quantum search algorithm...
November 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29149268/mitral-valve-replacement-with-the-novel-tribio-and-an-established-stented-bioprosthesis-in-a-sheep-model
#8
Sina Stock, Hans-Hinrich Sievers, Doreen Richardt, Michael Scharfschwerdt
OBJECTIVES: Heart valve replacement with a bioprosthesis is one of the most frequently performed procedures in cardiac surgery and represents a highly effective therapy to relieve diseased heart valves. Nevertheless, as postoperatively elevated transvalvular gradients and prosthesis-patient mismatch are reported as shortcomings of the procedure or of the currently used devices, there is a need for novel bioprostheses with improved haemodynamics. This study presents preclinical haemodynamic results after mitral valve replacement with the novel TRIBIO bioprosthesis (TRIBIO) compared with an established bioprosthesis in a sheep model...
November 15, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29149190/improved-capture-of-drosophila-suzukii-by-a-trap-baited-with-two-attractants-in-the-same-device
#9
Rodrigo Lasa, Eduardo Tadeo, Ricardo A Toledo-Hérnandez, Lino Carmona, Itzel Lima, Trevor Williams
The improvement of trap-lure combinations is an important part of integrated pest management programs that involve monitoring pests for timely insecticide applications, or for their use in control strategies such as mass trapping or bait stations. In this study improvements in the capture of Drosophila suzukii were not observed following the inclusion of different color stimuli with respect to a red-black stripe cup trap. This red-black stripe trap with a hemispherical dome-shaped lid had a significantly improved physical retention of flies compared to traps fitted with a flat lid...
2017: PloS One
https://www.readbyqxmd.com/read/29149152/loss-of-efficacy-to-spinal-cord-stimulator-therapy-clinical-evidence-and-possible-causes
#10
Christopher M Aiudi, Roger Y Dunn, Sara M Burns, Sarah A Roth, Arissa Opalacz, Yi Zhang, Lucy Chen, Jianren Mao, Shihab U Ahmed
BACKGROUND: Although spinal cord stimulation (SCS) therapy has been shown to be efficacious in various pain conditions, the ability for SCS therapy to maintain long-term efficacy has been questioned. OBJECTIVE: The purpose of this study was to investigate whether a loss of efficacy (LOE) phenomenon exists with SCS therapy and to investigate if this phenomenon is more apparent in any specific patient population. STUDY DESIGN: A retrospective, observation chart review was conducted to evaluate the patient response to SCS therapy over time...
November 2017: Pain Physician
https://www.readbyqxmd.com/read/29149061/mechanical-corrosion-and-biological-properties-of-room-temperature-sputtered-aluminum-nitride-films-with-dissimilar-nanostructure
#11
Cristina Besleaga, Viorel Dumitru, Liliana Marinela Trinca, Adrian-Claudiu Popa, Constantin-Catalin Negrila, Łukasz Kołodziejczyk, Catalin-Romeo Luculescu, Gabriela-Cristina Ionescu, Razvan-George Ripeanu, Alina Vladescu, George E Stan
Aluminum Nitride (AlN) has been long time being regarded as highly interesting material for developing sensing applications (including biosensors and implantable sensors). AlN, due to its appealing electronic properties, is envisaged lately to serve as a multi-functional biosensing platform. Although generally exploited for its intrinsic piezoelectricity, its surface morphology and mechanical performance (elastic modulus, hardness, wear, scratch and tensile resistance to delamination, adherence to the substrate), corrosion resistance and cytocompatibility are also essential features for high performance sustainable biosensor devices...
November 17, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29149034/multiferroic-hysteresis-loop
#12
Alexander Ruff, Alois Loidl, Stephan Krohns
Multiferroics, showing both ferroelectric and magnetic order, are promising candidates for future electronic devices. Especially, the fundamental understanding of ferroelectric switching is of key relevance for further improvements, which however is rarely reported in literature. On a prime example for a spin-driven multiferroic, LiCuVO₄, we present an extensive study of the ferroelectric order and the switching behavior as functions of external electric and magnetic fields. From frequency-dependent polarization switching and using the Ishibashi-Orihara theory, we deduce the existence of ferroelectric domains and domain-walls...
November 17, 2017: Materials
https://www.readbyqxmd.com/read/29148955/experience-of-tubo-ovarian-abscess-a-retrospective-clinical-analysis-of-318-patients-in-a-single-tertiary-center-in-middle-turkey
#13
Zeynep Ozturk Inal, Hasan Ali Inal, Umit Gorkem
BACKGROUND: The objective was to identify the clinical and laboratory parameters, ultrasonographic (USG) morphology, and to predict surgical treatment for patients with tubo-ovarian abscess (TOA). PATIENTS AND METHODS: Data for a total of 318 patients with a diagnosis of TOA between January 2005 and December 2016 were analyzed retrospectively at a referral center in Turkey. Patients requiring surgical treatment were compared with those who did not with respect to demographic characteristics and clinical, USG, and laboratory findings...
November 17, 2017: Surgical Infections
https://www.readbyqxmd.com/read/29148851/airway-geometry-airway-flow-and-particle-measurement-methods-implications-on-pulmonary-drug-delivery
#14
A Kourmatzis, S Cheng, H-K Chan
The effectiveness of drug delivery to the lungs is inextricably linked to the fundamental interactions that occur between particles and flow in the extrathoracic airway. Research in this field requires time resolved in-vivo and in-vitro measurements of three separate, yet intricately linked parameters: i) airway flow, ii) airway geometry, and iii) drug particle characteristics. A number of recent significant developments have been made in the experimental diagnostic tools used to characterise these parameters...
November 17, 2017: Expert Opinion on Drug Delivery
https://www.readbyqxmd.com/read/29148829/volumetric-absorptive-microsampling-combined-with-impact-assisted-extraction-for-hematocrit-effect-free-assays
#15
Nikolay Youhnovski, Laurence Mayrand-Provencher, Eugénie-Raphaëlle Bérubé, Jeff Plomley, Hélène Montpetit, Milton Furtado, Anahita Keyhani
AIM: Volumetric absorptive microsampling (VAMS) is a recent technology available for sampling and analyzing low blood volume. The present work describes the utilization of VAMS for the quantitation of naproxen and ritonavir in human blood using a novel bead-based impact-assisted extraction (IAE) procedure. RESULTS: Sampling volume accuracy of the VAMS device was independent of the blood hematocrit (HCT) level, however analyte recovery decreased with increasing HCT when extracted using ultrasonication...
November 17, 2017: Bioanalysis
https://www.readbyqxmd.com/read/29148810/enhancement-of-light-absorption-in-silicon-nanowire-photovoltaic-devices-with-dielectric-and-metallic-grating-structures
#16
Jin-Sung Park, Kyoung-Ho Kim, Min-Soo Hwang, Xing Zhang, Jung Min Lee, Jungkil Kim, Kyung-Deok Song, You-Shin No, Kwang-Yong Jeong, James F Cahoon, Sun-Kyung Kim, Hong-Gyu Park
We report the enhancement of light absorption in Si nanowire photovoltaic devices with one-dimensional dielectric or metallic gratings that are fabricated by a damage-free, precisely aligning, polymer-assisted transfer method. Incorporation of a Si3N4 grating with a Si nanowire effectively enhances the photocurrents for transverse-electric polarized light. The wavelength at which a maximum photocurrent is generated is readily tuned by adjusting the grating pitch. Moreover, the electrical properties of the nanowire devices are preserved before and after transferring the Si3N4 gratings onto Si nanowires, ensuring that the quality of pristine nanowires is not degraded during the transfer...
November 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/29148808/detection-of-short-waved-spin-waves-in-individual-microscopic-spin-wave-waveguides-using-the-inverse-spin-hall-effect
#17
Thomas Brächer, Mathieu Fabre, Thomas Meyer, Tobias Fischer, Stéphane Auffret, Olivier Boulle, Ursula Ebels, Philipp Pirro, Gilles Gaudin
The miniaturization of CMOS devices becomes increasingly difficult due to fundamental limitations and the increase of leakage currents. Large research efforts are devoted to find alternative concepts that allow for a larger data-density and lower power consumption than conventional semiconductor approaches. Spin waves have been identified as a potential technology that can complement and outperform CMOS in complex logic applications, profiting from the fact that these waves enable wave computing on the nano-scale...
November 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/29148723/dna-microviscosity-characterization-with-particle-diffusometry-for-downstream-dna-detection-applications
#18
Katherine Noel Clayton, Gregory D Berglund, Jacqueline C Linnes, Tamara L Kinzer-Ursem, Steven T Wereley
Analytical characterization of DNA microviscosity provides critical biophysical insights into nuclear crowding, nucleic acid-based pharmaceutical development, and nucleic acid-based biosensor device design. However, most viscosity characterization methods require large sample volumes and destructive testing. In contrast, particle diffusometry, permits in situ analysis of DNA microviscosity with short measurement times (8 seconds) using small volumes (< 3L) which are compatible with DNA preparatory procedures...
November 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29148722/acoustic-wave-driven-functionalized-particles-for-aptamer-based-target-biomolecule-separation
#19
Raheel Ahmad, Ghulam Destgeer, Muhammad Afzal, Jinsoo Park, Husnain Ahmed, Jin Ho Jung, Kwangseok Park, Tae-Sung Yoon, Hyung Jin Sung
We developed a hybrid microfluidic device that utilized acoustic waves to drive functionalized microparticles inside a continuous flow microchannel and to separate particle-conjugated target proteins from a complex fluid. The acoustofluidic device comprised of an interdigitated transducer (IDT) that produced high-frequency surface acoustic waves (SAW) in a polydimethylsiloxane (PDMS) microfluidic channel. The SAW interacted with the sample fluid flow inside the microchannel and deflected particles from their original streamlines to achieve separation...
November 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29148718/atomic-layer-deposition-of-single-crystalline-beo-epitaxially-grown-on-gan-substrates
#20
Seung Min Lee, Jung Hwan Yum, Seonno Yoon, Eric S Larsen, Woo Chul Lee, Seong Keun Kim, Shahab Shervin, Weijie Wang, Jae-Hyun Ryou, Christopher W Bielawski, Jungwoo Oh
We have developed a beryllium oxide (BeO) thin film process by atomic layer deposition (ALD) and grown a single-crystal BeO on a gallium nitride (GaN) substrate for the first time. BeO has a higher thermal conductivity than all other metals except Cu, Ag, and Au, and it has a higher bandgap energy and dielectric constant than SiO2 and Al2O3. As an electrical insulator, diamond is the only material on Earth whose thermal conductivity exceeds that of BeO. Despite these advantages, there is no chemical vapor deposition technique for BeO thin film deposition, and thus, it is not used in nanoscale semiconductor device processing...
November 17, 2017: ACS Applied Materials & Interfaces
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