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https://www.readbyqxmd.com/read/28931195/hereditary-hemorrhagic-telangiectasia-laser-treatment-of-epistaxis
#1
Gorazd Poje, Marcel Marjanović Kavanagh
Hereditary hemorrhagic telangiectasia (HHT) is a rare, autosomal dominant disorder characterized by recurrent epistaxis, telangiectasias, and multiorgan vascular dysplasia. Various modalities exist for the treatment of HHT-related chronic epistaxis, although no method is preferred over another. The aim of this study was to review the effectiveness of diode laser photocoagulation in the treatment of epistaxis in patients with HHT. The study included 17 patients (7 men, 10 women) treated with diode laser photocoagulation from year 2008 to 2012...
September 2017: Ear, Nose, & Throat Journal
https://www.readbyqxmd.com/read/28931040/newborn-skin-reflection-proof-of-concept-for-a-new-approach-for-predicting-gestational-age-at-birth-a-cross-sectional-study
#2
Zilma Silveira Nogueira Reis, Gabriela Luiza Nogueira Vitral, Ingrid Michelle Fonseca de Souza, Maria Albertina Santiago Rego, Rodney Nascimento Guimaraes
BACKGROUND: Current methods to assess the gestational age during prenatal care or at birth are a global challenge. Disadvantages, such as low accessibility, high costs, and imprecision of clinical tests and ultrasonography measurements, may compromise health decisions at birth, based on the gestational age. Newborns' organs and tissues can indirectly indicate their physical maturity, and we hypothesized that evolutionary changes in their skin, detected using an optoelectronic device meter, may aid in estimating the gestational age...
2017: PloS One
https://www.readbyqxmd.com/read/28930790/photography-in-dermatologic-surgery-selection-of-an-appropriate-lighting-solution-for-a-particular-clinical-application
#3
Brian R Chen, Emily Poon, Murad Alam
BACKGROUND: Lighting is an important component of consistent, high-quality dermatologic photography. There are different types of lighting solutions available. OBJECTIVE: To evaluate currently available lighting equipment and methods suitable for procedural dermatology. MATERIALS AND METHODS: Overhead lighting, built-in camera flashes, external flash units, studio strobes, and light-emitting diode (LED) light panels were evaluated with regard to their utility for dermatologic surgeons...
September 19, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28930347/a-paper-triboelectric-nanogenerator-for-self-powered-electronic-systems
#4
Yanchao Mao, Nan Zhang, Yingjie Tang, Meng Wang, Mingju Chao, Erjun Liang
Paper, as one of the most important inventions of mankind, is still widely used in our daily life. In this study, the paper is explored as a platform for power sources based on the universally known triboelectric friction. A novel paper triboelectric nanogenerator (P-TENG) was successfully developed, which could harvest mechanical energy from ambient sources and generate considerable electrical energy. The maximum power density of the P-TENG reached 53 W m(-2). In addition, the P-TENG possesses a natural advantage of being able to be integrated within a book, and thus can effectively convert mechanical energy from the action of turning book pages into electricity...
September 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28930319/revealing-the-correlation-between-charge-carrier-recombination-and-extraction-in-an-organic-solar-cell-under-varying-illumination-intensity
#5
Abhishek Sharma, Mihirsinh Chauhan, Vishal Bharti, Manoj Kumar, Suresh Chand, Brijesh Tripathi, J P Tiwari
The design and fabrication of better excitonic solar cells are the need of the hour for futuristic energy solutions. This designing needs a better understanding of the charge transport properties of excitonic solar cells. One of the popular methods of understanding the charge transport properties is the analysis of the J-V characteristics of a device through theoretical simulation at varied illumination intensity. Herein, a J-V characteristic of a polymer:fullerene based bulk heterojunction (BHJ) organic solar cells (OSCs) of structure ITO/PEDOT:PSS (∼40 nm)/PTB7:PC71BM (∼100 nm)/Al (∼120 nm) is analyzed using one- and two-diode models at varied illumination intensity in the range of 0...
September 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28929624/structural-mimics-of-phenyl-pyridine-ppy-substituted-phosphorescent-cyclometalated-homo-and-heteroleptic-iridium-iii-complexes-for-organic-light-emitting-diodes-an-overview
#6
REVIEW
Aravind Babu Kajjam, Sivakumar Vaidyanathan
Today organic light emitting diodes are a topic of significant academic and industrial research interest. OLED technology is used in commercially available displays, and efforts have been directed to improve this technology. Design and synthesis of phosphorescent based transition metals are capable of harvesting both singlet and triplet excitons and achieve 100 % internal quantum efficiency is an active area of research. Among all the transition metals, iridium is considered a prime candidate for OLEDs due to its prominent photophysical characteristics...
September 20, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28929358/green-synthesis-of-inp-zns-core-shell-quantum-dots-for-application-in-heavy-metal-free-light-emitting-diodes
#7
Tsung-Rong Kuo, Shih-Ting Hung, Yen-Ting Lin, Tzu-Lin Chou, Ming-Cheng Kuo, Ya-Pei Kuo, Chia-Chun Chen
Quantum dot light-emitting diodes (QD-LEDs) have been considered as potential display technologies with the characterizations of high color purity, flexibility, transparency, and cost efficiency. For the practical applications, the development of heavy-metal-free QD-LEDs from environment-friendly materials is the most important issue to reduce the impacts on human health and environmental pollution. In this work, heavy-metal-free InP/ZnS core/shell QDs with different fluorescence were prepared by green synthesis method with low cost, safe, and environment-friendly precursors...
September 19, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28929136/allochroic-thermally-activated-delayed-fluorescence-diodes-through-field-induced-solvatochromic-effect
#8
Chunmiao Han, Chunbo Duan, Weibo Yang, Mingchen Xie, Hui Xu
Allochroic organic light-emitting devices (AOLEDs) characterized by field-dependent emissive color variation are promising as visible signal response units for intelligent applications. Most of the AOLEDs were realized by changing their recombination zones or inter- and intramolecular energy transfer, rendering the limited repeatability, stability, and electroluminescence (EL) performance. We report a novel thermally activated delayed fluorescence (TADF) diode that featured a successive and irreversible emission color change from bluish green to deep blue during voltage increase, which uses the significant influence of host polarity on the emission color of TADF dyes, namely, solvatochromic effect...
September 2017: Science Advances
https://www.readbyqxmd.com/read/28927602/solid-state-photoluminescence-thermoplastic-starch-film-containing-graphene-quantum-dots
#9
Siamak Javanbakht, Hassan Namazi
Fluorescent polymer films, a matrix of thermoplastic starch (TPS) based bio-polymer and graphene quantum dots (GQDs) were fabricated by a casting method. The GQDs provide solid state fluorescent properties to the prepared thermoplastic starch graphene quantum dots (TPS/GQD). The fluorescent, thermal, mechanical and optical properties of TPS/GQD were investigated. High optical transparency (88-91%) and well dispersion of GQDs (1-17wt%) in the polymeric matrix of TPS/GQD nanocomposite was observed. The maximum photoluminescence intensity of materials has been obtained at 50wt% of GQD content...
November 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28926863/evaluation-of-cannabinoid-and-terpenoid-content-cannabis-flower-compared-to-supercritical-co2-concentrate
#10
Michelle Sexton, Kyle Shelton, Pam Haley, Mike West
A recent cannabis use survey revealed that 60% of cannabis users rely on smelling the flower to select their cannabis. Olfactory indicators in plants include volatile compounds, principally represented by the terpenoid fraction. Currently, medicinal- and adult-use cannabis is marketed in the United States with relatively little differentiation between products other than by a common name, association with a species type, and Δ-9 tetrahydrocannabinol/cannabidiol potency. Because of this practice, how terpenoid compositions may change during an extraction process is widely overlooked...
September 19, 2017: Planta Medica
https://www.readbyqxmd.com/read/28926231/resonance-emission-enhancement-ree-for-narrow-band-red-emitting-a2gef6-mn-4-a-na-k-rb-cs-phosphors-synthesized-via-a-precipitation-cation-exchange-route
#11
Hongzhou Lian, Qingming Huang, Yeqing Chen, Kai Li, Sisi Liang, Mengmeng Shang, Manman Liu, Jun Lin
Narrow band red-emitting A2GeF6:Mn(4+) (A = Na, K, Rb, Cs) phosphors were prepared through a two-step precipitation-cation exchange route using a K2MnF6 precursor as the Mn(4+) source. The phase purity, morphology, and constituent were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectric spectroscopy (XPS), and electron paramagnetic resonance (EPR) examination. Optical properties were investigated by photoluminescence spectra (PL and PLE) and high-resolution PL. A temperature-dependent PL examination was performed to investigate the electron-phonon coupling emission mechanism of Mn(4+) in these alkali fluorogermanates...
September 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28926227/vertically-stacked-and-self-encapsulated-van-der-waals-heterojunction-diodes-using-two-dimensional-layered-semiconductors
#12
Jinshui Miao, Zhihao Xu, Li Qing, Arthur Bowman, Suoming Zhang, Weida Hu, Zhixian Zhou, Chuan Wang
Van der Waals heterojunctions using 2D semiconducting materials could overcome the defect issues included by lattice mismatch in conventional epitaxially-grown heterojunctions with bulk materials and could enable a much wider palette for choice of materials and more sophisticated device design. Such 2D heterojunction devices are of great interest for important functional devices such as diodes, bipolar junction transistors, light-emitting diodes, and photodetectors. In this paper, we demonstrate a truly vertical p-n heterojunction diode built from 2D semiconductors (MoS2 and BP) and compare its performance against conventional lateral 2D heterojunction devices...
September 19, 2017: ACS Nano
https://www.readbyqxmd.com/read/28926203/qualitative-and-quantitative-analysis-of-chemical-constituents-in-ardisiae-japonicae-herba
#13
Ke-Yun Yu, Wen Gao, Shang-Zhen Li, Wei Wu, Pei Li, Li-Li Dou, Yuan-Zhong Wang, E-Hu Liu
Ardisiae Japonicae Herba is a well-known traditional Chinese medicine for the treatment of bronchitis conjunctivitis, pneumonia and trauma. In this work, a high-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry method was firstly established for the separation and structural identification of the chemical constituents in Ardisiae Japonicae Herba. A total of 15 compounds including coumarins, flavonoid glycosides, and catechins were identified or tentatively characterized based on their chromatographic behaviors and mass spectral fragmentation and by comparisons with the reference standards...
September 19, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28926075/high-efficiency-quantum-dot-light-emitting-diodes-from-positive-aging
#14
Krishna P Acharya, Alexandre Titov, Jake Hyvonen, Chenggong Wang, Jean Tokarz, Paul H Holloway
Colloidal quantum dot-polymer hybrid light emitting diodes (QLEDs) that exhibit external quantum efficiencies >12% for all three primary colors (21% from green) have been demonstrated. These high efficiencies result in part from a positive aging effect reported here for the first time, where positive aging means the efficiency of the QLED increased with time. We have achieved 470 h operational life time (T90) at 2550 nits for red QLEDs. At longer times, negative aging phenomena lead to lower luminance and limit the lifetime of the QLEDs...
September 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28925706/field-effect-transistors-based-on-van-der-waals-grown-and-dry-transferred-all-inorganic-perovskite-ultrathin-platelets
#15
Chengxue Huo, Xuhai Liu, Xiufeng Song, Ziming Wang, Haibo Zeng
Nowadays, the research on perovskite transistors is still in its infancy, despite the fact that perovskite-based solar cells and light-emitting diodes have been widely investigated. Two major hurdles exist before obtaining reliable perovskite-based transistors: the processing difficulty for their sensitivity to polar solvents and unsatisfactory perovskite quality on the transistor platform. Here, for the first time, we report on high-performance all-inorganic perovskite FETs profiting from both van der Waals epitaxial boundary-free ultrathin single crystals and completely dry-processed transfer technique without chemical contaminant...
September 20, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28924567/rearrangeable-and-exchangeable-optical-module-with-system-on-chip-for-wearable-functional-near-infrared-spectroscopy-system
#16
Tsukasa Funane, Takashi Numata, Hiroki Sato, Shinsuke Hiraizumi, Yuichi Hasegawa, Hidenobu Kuwabara, Kiyoshi Hasegawa, Masashi Kiguchi
We developed a system-on-chip (SoC)-incorporated light-emitting diode (LED) and avalanche photodiode (APD) modules to improve the usability and flexibility of a fiberless wearable functional near-infrared spectroscopy (fNIRS) system. The SoC has a microprocessing unit and programmable circuits. The time division method and the lock-in method were used for separately detecting signals from different positions and signals of different wavelengths, respectively. Each module autonomously works for this time-divided-lock-in measurement with a high sensitivity for haired regions...
January 2018: Neurophotonics
https://www.readbyqxmd.com/read/28924329/a-computational-tool-for-accelerated-analysis-of-oligomeric-proanthocyanidins-in-plants
#17
Mengliang Zhang, Jianghao Sun, Pei Chen
A computational tool was developed to facilitate proanthocyanidin analysis using data collected by ultra-high-performance liquid chromatography-diode array detection-high resolution accurate mass-mass spectrometry (UHPLC-DAD-HRAM-MS). Both identification and semi-quantitation of proanthocyanidins can be achieved by the developed computational tool. It can extract proanthocyanidin chromatographic peaks, deconvolute the isotopic patterns of A-type, B-type, and multi-charged proanthocyanidins ions, and predict proanthocyanidin structures...
March 2017: Journal of Food Composition and Analysis
https://www.readbyqxmd.com/read/28924166/determination-of-unique-power-conversion-efficiency-of-solar-cell-showing-hysteresis-in-the-i-v-curve-under-various-light-intensities
#18
Ludmila Cojocaru, Satoshi Uchida, Koichi Tamaki, Piyankarage V V Jayaweera, Shoji Kaneko, Jotaro Nakazaki, Takaya Kubo, Hiroshi Segawa
Energy harvesting at low light intensities has recently attracted a great deal of attention of perovskite solar cells (PSCs) which are regarded as promising candidate for indoor application. Anomalous hysteresis of the PSCs a complex issue for reliable evaluation of the cell performance. In order to address these challenges, we constructed two new evaluation methods to determinate the power conversion efficiencies (PCEs) of PSCs. The first setup is a solar simulator based on light emitting diodes (LEDs) allowing evaluation of the solar cells at wider range of light intensities, ranging from 10(2) to 10(-3) mW·cm(-2)...
September 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28921963/direct-vapor-growth-of-perovskite-cspbbr3-nanoplate-electroluminescence-devices
#19
Xuelu Hu, Hong Zhou, Zhenyu Jiang, Xiao Wang, Shuangping Yuan, Jianyue Lan, Yongping Fu, Xuehong Zhang, Weihao Zheng, Xiaoxia Wang, Xiaoli Zhu, Lei Liao, Gengzhao Xu, Song Jin, Anlian Pan
Metal halide perovskite nanostructures hold great promises as nanoscale light sources for integrated photonics due to their excellent optoelectronic properties. However, it remains a great challenge to fabricate halide perovskite nanodevices using traditional lithographic methods, because the halide perovskites can be dissolved in the polar solvents that are required in the traditional device fabrication process. Herein, we report single CsPbBr3 nanoplate electroluminescence (EL) devices fabricated by directly growing CsPbBr3 nanoplates on pre-patterned indium tin oxide (ITO) electrodes via a vapor-phase deposition...
September 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28921874/polaronic-charge-carrier-lattice-interaction-in-lead-halide-perovskites
#20
Christoph Wolf, Young-Hoon Kim, Himchan Cho, Tae-Woo Lee
Almost ten years after the renaissance of the popular perovskite-type semiconductors based on lead-salts with general formula AMX3 (A=organic or inorganic cation, M=divalent metal, X=halide), many facets of photophysics continue to puzzle researchers. In this review, we shed some light on the low mobilities of charge carriers in lead-halide perovskites with special focus on the lattice properties at non-zero temperature. The polar and soft lattice leads to pronounced electron-phonon coupling, limiting carrier mobility and retarding recombination...
September 18, 2017: ChemSusChem
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