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https://www.readbyqxmd.com/read/28454483/efficient-carrier-injection-transport-relaxation-and-recombination-associated-with-a-stronger-carrier-localization-and-a-low-polarization-effect-of-nonpolar-m-plane-ingan-gan-light-emitting-diodes
#1
Fann-Wei Yang, Yu-Siang You, Shih-Wei Feng
Based on time-resolved electroluminescence (TREL) measurement, more efficient carrier injection, transport, relaxation, and recombination associated with a stronger carrier localization and a low polarization effect in a nonpolar m-plane InGaN/GaN light emitting diode (m-LED), compared with those in a polar c-LED, are reported. With a higher applied voltage in the c-LED, decreasing response time and rising time improve device performance, but a longer recombination time degrades luminescence efficiency. By using an m-LED with a stronger carrier localization and a low polarization effect, shorter response, rising, and recombination times provide more efficient carrier injection, transport, relaxation, and recombination...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28454482/effects-of-environmental-factors-and-metallic-electrodes-on-ac-electrical-conduction-through-dna-molecule
#2
S Abdalla, A Obaid, F M Al-Marzouki
BACKGROUND: Deoxyribonucleic acid (DNA) is one of the best candidate materials for various device applications such as in electrodes for rechargeable batteries, biosensors, molecular electronics, medical- and biomedical-applications etc. Hence, it is worthwhile to examine the mechanism of charge transport in the DNA molecule, however, still a question without a clear answer is DNA a molecular conducting material (wire), semiconductor, or insulator? The answer, after the published data, is still ambiguous without any confirmed and clear scientific answer...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28454480/immobilization-of-ph-sensitive-cdte-quantum-dots-in-a-poly-acrylate-hydrogel-for-microfluidic-applications
#3
M Franke, S Leubner, A Dubavik, A George, T Savchenko, C Pini, P Frank, D Melnikau, Y Rakovich, N Gaponik, A Eychmüller, A Richter
Microfluidic devices present the basis of modern life sciences and chemical information processing. To control the flow and to allow optical readout, a reliable sensor material that can be easily utilized for microfluidic systems is in demand. Here, we present a new optical readout system for pH sensing based on pH sensitive, photoluminescent glutathione capped cadmium telluride quantum dots that are covalently immobilized in a poly(acrylate) hydrogel. For an applicable pH sensing the generated hybrid material is integrated in a microfluidic sensor chip setup...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28454477/in-situ-analysis-of-oxygen-vacancies-and-band-alignment-in-hfo2-tin-structure-for-cmos-applications
#4
Da-Peng Xu, Lin-Jie Yu, Xu-Dong Chen, Lin Chen, Qing-Qing Sun, Hao Zhu, Hong-Liang Lu, Peng Zhou, Shi-Jin Ding, David Wei Zhang
The density of oxygen vacancies characterization in high-k/metal gate is significant for semiconductor device fabrication. In this work, a new approach was demonstrated to detect the density of oxygen vacancies by in situ x-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) measurement. Moreover, the band alignment of the structure with optical band gap measured by spectroscopic ellipsometry (SE) and valence band offset by UPS were reported. The specific areal density of oxygen vacancies in high-k dielectric of HfO2/TiN was obtained by fitting the experiment data to be 8...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28454181/demonstration-of-a-highly-efficient-terahertz-flat-lens-employing-tri-layer-metasurfaces
#5
Chun-Chieh Chang, Daniel Headland, Derek Abbott, Withawat Withayachumnankul, Hou-Tong Chen
We demonstrate a terahertz flat lens based on tri-layer metasurfaces allowing for broadband linear polarization conversion, where the phase can be tuned through a full 2π range by tailoring the geometry of the subwavelength resonators. The lens functionality is realized by arranging these resonators to create a parabolic spatial phase profile. The fabricated 124-μm-thick device is characterized by scanning the beam profile and cross section, showing diffraction-limited focusing and ∼68% overall efficiency at the operating frequency of 400 GHz...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454180/cryogenically-cooled-cef3-crystal-as-media-for-high-power-magneto-optical-devices
#6
Aleksey Starobor, Evgeniy Mironov, Ilya Snetkov, Oleg Palashov, Hiroaki Furuse, Shigeki Tokita, Ryo Yasuhara
The thermally induced depolarization and Verdet constant of CeF<sub>3</sub> crystals-their most important characteristics-have been studied in the 79-293 K temperature range. It has been found that thermal effects reduce substantially upon cooling down to 79 K and the Verdet constant grows in inverse proportion to the temperature. It was shown that CeF<sub>3</sub> crystals are not inferior to TGG as a medium for Faraday isolators, including cryogenic ones.
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454159/modal-interferometer-based-on-a-single-mechanically-induced-long-period-fiber-grating-and-a-nanoparticles-coated-film-section
#7
Karla M Salas-Alcántara, Laura Aparicio-Ixta, Ismael Torres-Gómez, Mario Rodríguez, Gabriel Ramos-Ortiz, Rafael Espinosa-Luna, Juan L Pichardo-Molina
A modal interferometer by a single mechanically induced long-period fiber grating (MI-LPFG) using a half-length coating fiber is presented. The coating material used for this Letter is a film of silica nanoparticles doped with an organic chromophore. The silica nanoparticles, with diameters within the range of 40-50 nm, were deposited over 3.5 cm length of fiber by the dip-coating method, forming a film with a thickness between 500 and 1250 nm. Then the modal interferometer was implemented by inscribing the MI-LPFG over the coated fiber section and a similar fiber length of the uncoated fiber...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454138/programmable-single-pixel-based-broadband-stimulated-raman-scattering
#8
Pascal Berto, Camille Scotté, Frédéric Galland, Hervè Rigneault, Hilton B de Aguiar
We report a simple add-on for broadband stimulated Raman scattering (SRS) microscopes to enable fast and programmable spectroscopy acquisition. It comprises a conventional dispersive spectrometer layout incorporating a fast digital micromirror device (DMD). The approach is validated by acquiring SRS spectra of standard chemicals. We demonstrate a DMD's advantage in broadband SRS by showing higher signal-to-noise ratio using a multiplexed Hadamard spectral basis and compressive sensing detection. Our results apply to a variety of frequency-domain pump-probe spectroscopy...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454133/aperture-scalable-high-average-power-capable-hybrid-electrode-pockels-cell
#9
Jun Zhang, Xiongjun Zhang, Jiangang Zheng, Jiao Long, Xiaolin Tian, Kuixing Zheng, Qihua Zhu, Xiaofeng Wei
We demonstrate a hybrid-electrode Pockels cell (HEPC) using a thin z-cut deuterated potassium dihydrogen phosphate (DKDP) crystal. The device is a reflective, longitudinally driven, longitudinally cooled Pockels cell, constructed with a plasma chamber providing the incident-side electrode and a silicon-substrate mirror serving the three purposes of a mirror, a back-side electrode, and a heat sink. The mirror and the DKDP are thermally coupled through a sub-millimeter, inert gas-filled gap. A time-multiplex pass-by driving method is proposed to favor low-voltage and fast-response operation...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454131/uni-directional-wavelength-conversion-in-silicon-using-four-wave-mixing-driven-by-cross-polarized-pumps
#10
Bryn A Bell, Chunle Xiong, David Marpaung, Colin J McKinstrie, Benjamin J Eggleton
We demonstrate optical frequency conversion between telecom wavelengths using four-wave mixing Bragg scattering powered by two pump pulses polarized on orthogonal axes of a silicon waveguide. This allows conversion in a single frequency direction while, with co-polarized pumps, the signal is redshifted or blueshifted with similar efficiency. Our approach exploits the birefringence of the waveguide and its effect on the phase matching of the four-wave mixing process. The blue or red direction can be selected by the input polarization of the signal, and 20 dB extinction ratios are observed with the unintended direction...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28453977/measurement-of-the-effective-energy-of-pulsed-x-rays-emitted-from-a-mather-type-plasma-focus-device
#11
Seyed Milad Miremad, Babak Shirani Bidabadi
The current study examined the effective energy of pulsed x-rays emitted from a Mather-type plasma focus device with copper anodes at an energy range of 2-3kJ using x-ray transmission radiography. Aluminum filters of different thicknesses and dental x-ray film were used. When air gas was used at a constant voltage of 21kV at 0.3, 0.6, 0.9 and 1.2 mbar, the effective energy of pulsed the x-ray was 10.9, 10.7, 17.3 and 15.8keV, respectively. At 0.6 mbar of air, as the operating voltage increased to 19, 21 and 23kV, the effective energy of the x-ray radiation was 10...
April 23, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28453969/reducing-intrusive-traumatic-memories-after-emergency-caesarean-section-a-proof-of-principle-randomized-controlled-study
#12
Antje Horsch, Yvan Vial, Céline Favrod, Mathilde Morisod Harari, Simon E Blackwell, Peter Watson, Lalitha Iyadurai, Michael B Bonsall, Emily A Holmes
Preventative psychological interventions to aid women after traumatic childbirth are needed. This proof-of-principle randomized controlled study evaluated whether the number of intrusive traumatic memories mothers experience after emergency caesarean section (ECS) could be reduced by a brief cognitive intervention. 56 women after ECS were randomized to one of two parallel groups in a 1:1 ratio: intervention (usual care plus cognitive task procedure) or control (usual care). The intervention group engaged in a visuospatial task (computer-game 'Tetris' via a handheld gaming device) for 15 min within six hours following their ECS...
April 6, 2017: Behaviour Research and Therapy
https://www.readbyqxmd.com/read/28453872/cross-sectional-study-of-the-feasibility-of-urinating-in-a-standing-position-among-women-in-the-third-trimester-of-pregnancy
#13
Pei-Yu Yang, Chi-Cheng Chen, Cherry Yin-Yi Chang, Eric Chieh-Lung Chou, Nai-Hsin Meng
Using a homemade auxiliary device, urinating in a standing position was a feasible alternative to a seated position for women during pregnancy. Pregnant women can experience difficulty voiding in a squatting or crouching position in the absence of a sitting toilet; voiding in a standing position represents a potential alternative. In previous studies [1, 2], voiding in the standing position using a homemade auxiliary device was demonstrated to be a feasible alternative for both young, healthy women [1] and elderly patients with knee osteoarthritis [2]...
April 28, 2017: International Journal of Gynaecology and Obstetrics
https://www.readbyqxmd.com/read/28453851/eradication-of-staphylococcus-aureus-biofilm-infections-using-synthetic-antimicrobial-peptides
#14
Marta Zapotoczna, Éanna Forde, Siobhan Hogan, Hilary Humphreys, James P O'Gara, Deirdre Fitzgerald-Hughes, Marc Devocelle, Eoghan O'Neill
Here, we demonstrate that antimicrobial peptides (AMPs) are an effective antibiofilm treatment when applied as catheter lock solutions (CLSs) against S. aureus biofilm infections. The activity of synthetic AMPs (Bac8c, HB43, P18, Omiganan, WMR, Ranalexin, and Polyphemusin) was measured against early and mature biofilms produced by methicillin-resistant S. aureus and methicillin-susceptible S. aureus isolates from patients with device-related infections grown under in vivo-relevant biofilm conditions. The cytotoxic and hemolytic activities of the AMPs against human cells and their immunomodulatory potential in human blood were also characterized...
March 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28453827/factors-constraining-patient-engagement-in-implantable-medical-device-discussions-and-decisions-interviews-with-physicians
#15
Anna R Gagliardi, Pascale Lehoux, Ariel Ducey, Anthony Easty, Sue Ross, Chaim M Bell, Patricia Trbovich, Julie Takata, David R Urbach
Objective: Patient engagement (PE) is warranted when treatment risks and outcomes are uncertain, as is the case for higher risk medical devices. Previous research found that patients were not engaged in discussions or decisions about implantable medical devices. This study explored physician views about engaging patients in such discussions. Design: Qualitative interviews using a basic descriptive approach. Setting: Canada. Participants: Practicing cardiovascular and orthopaedic physicians...
April 1, 2017: International Journal for Quality in Health Care
https://www.readbyqxmd.com/read/28453795/closing-the-gap-in-paediatric-ventricular-assist-device-therapy-with-the-berlin-heart-excor%C3%A2-15-ml-pump%C3%A2
#16
Fabrizio De Rita, Massimo Griselli, Eugen Sandica, Oliver Miera, Ann Karimova, Yves d'Udekem, Ranny Goldwasser, Katarzyna Januszewska, Antonio Amodeo, Nadine Jurrmann, Simon Ersel, Ares K Menon
OBJECTIVES: The Berlin Heart EXCOR ® (EXCOR) paediatric ventricular assist device is used worldwide for mechanical support of infants and small children with end-stage heart failure. A clinically important gap between the smallest EXCOR blood pump (10 ml) and the next larger size (25 ml) limited the choice of pump size in patients with a body surface area (BSA) between 0.33 and 0.5 m 2 . We present the first clinical experience from the early product surveillance (EPS) of the new EXCOR 15-ml blood pump...
May 1, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28453577/abdominal-aortic-aneurysm-screening-program-using-hand-held-ultrasound-in-primary-healthcare
#17
Antoni Sisó-Almirall, Belchin Kostov, Marta Navarro González, Daniel Cararach Salami, Alfonso Pérez Jiménez, Rosa Gilabert Solé, Concepció Bru Saumell, Lluís Donoso Bach, Mireia Villalta Martí, Luis González-de Paz, Rafael Ruiz Riera, Vicenç Riambau Alonso, Nihan Acar-Denizli, Marta Farré Almacellas, Manuel Ramos-Casals, Jaume Benavent Àreu
We determined the feasibility of abdominal aortic aneurysm (AAA) screening program led by family physicians in public primary healthcare setting using hand-held ultrasound device. The potential study population was 11,214 men aged ≥ 60 years attended by three urban, public primary healthcare centers. Participants were recruited by randomly-selected telephone calls. Ultrasound examinations were performed by four trained family physicians with a hand-held ultrasound device (Vscan®). AAA observed were verified by confirmatory imaging using standard ultrasound or computed tomography...
2017: PloS One
https://www.readbyqxmd.com/read/28453556/characterization-of-interfragmentary-motion-associated-with-common-osteosynthesis-devices-for-rat-fracture-healing-studies
#18
Nicholaus Meyers, Matthias Sukopp, Rudolf Jäger, Malte Steiner, Romano Matthys, Bernd Lapatki, Anita Ignatius, Lutz Claes
Rat models are widely used in preclinical studies investigating fracture healing. The interfragmentary movement at a fracture site is critical to the course of healing and therefore demands definition in order to aptly interpret the experimental results. Estimation of this movement requires knowledge of the fixation stiffness and loading. The characteristic loading for the rat femur has been estimated, but the stiffness of fixation used in rat studies has yet to be fully described. This study aimed to determine the 6 degree of freedom stiffness of four commonly used implants, two external fixators (RatExFix and UlmExFix), a locking plate, and a locking intramedullary nail, in all degrees of freedom and estimate the interfragmentary movement under specific physiological loads...
2017: PloS One
https://www.readbyqxmd.com/read/28453441/fetal-cardiac-time-intervals-in-healthy-pregnancies-an-observational-study-by-fetal-ecg-monica-healthcare-system
#19
Annette Wacker-Gussmann, Cordula Plankl, Maria Sewald, Karl-Theo Maria Schneider, Renate Oberhoffer, Silvia M Lobmaier
BACKGROUND: Fetal electrocardiogram (fECG) can detect QRS signals in fetuses from as early as 17 weeks' gestation; however, the technique is limited by the minute size of the fetal signal relative to noise ratio. The aim of this study was to evaluate precise fetal cardiac time intervals (fCTIs) with the help of a newly developed fetal ECG device (Monica Healthcare System). METHODS: In a prospective manner we included 15-18 healthy fetuses per gestational week from 32 weeks onwards...
April 28, 2017: Journal of Perinatal Medicine
https://www.readbyqxmd.com/read/28453428/reality-check-basics-of-augmented-virtual-and-mixed-reality
#20
Tara J Brigham
Augmented, virtual, and mixed reality applications all aim to enhance a user's current experience or reality. While variations of this technology are not new, within the last few years there has been a significant increase in the number of artificial reality devices or applications available to the general public. This column will explain the difference between augmented, virtual, and mixed reality and how each application might be useful in libraries. It will also provide an overview of the concerns surrounding these different reality applications and describe how and where they are currently being used...
April 2017: Medical Reference Services Quarterly
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