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https://www.readbyqxmd.com/read/28087976/the-role-of-diode-array-ultraviolet-detection-for-the-identification-of-synthetic-cathinones
#1
Walter F Rowe, Ioan Marginean, Stephanie Carnes, Ira S Lurie
The utility of diode array UV detection for aiding in the identification of synthetic cathinones, including different sub classes and positional isomers is presented. For 35 synthetic cathinones' unique UV spectra are obtained for seven sub classes including mostly beta ketones, where position and type of substitution on benzene rings give rise to differences in UV maxima and relative intensity of the spectral bands. This aspect is key to distinguishing positional isomers which contain differences in R substitution (mono and di) around the benzene ring, which provides complementary information to electron ionization mass spectrometry, where the latter technique cannot distinguish between these types of positional isomers...
January 14, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28059375/anomalous-plasmon-resonance-from-confined-diffusive-charges-high-quality-and-tunability-from-mid-to-far-infrared-wavebands
#2
Yu Gu, Xiaoming Li, Jun Chen, Haibo Zeng
For heavily-doped semiconductor nanocrystals, a new class of plasmonic materials, the abundant dopants provide sufficient free carriers, but also act as scattering impurities, which have been limiting the merit of localized surface plasmon resonance (LSPR). To resolve this intrinsic contradiction, we propose a core-shell (heavily-lightly doped) semiconductor nanosystem to generate plasmon resonance from the highly mobile diffusive charges rather than the strongly scattered charges. We develop a complete theory to describe the spatial distribution of the diffusive charges as well as their resonance under the light excitation and predict a LSPR tunable from mid to far infrared band with a 15-fold field enhancement near the resonance...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28059311/pre-equalization-technique-enabling-70-gbit-s-photonic-wireless-link-at-60-ghz
#3
F C Abrecht, R Bonjour, S Welschen, A Josten, B Baeuerle, D Hillerkuss, M Burla, J Leuthold
In this paper, we demonstrate a 70 Gbit/s photonic-based wireless link at 60 GHz using a single RF carrier and a single polarization. This high capacity is achieved by using 32QAM modulation with a symbol rate of 14 GBd. We show a novel pre-equalization technique that enables usage of such very high bandwidths at 60 GHz. Our work indicates that the consumer oriented 60 GHz band could be a viable alternative to more expensive E-band or sub-THz links for high capacity photonic wireless transmission, mobile backhauling and last-mile high-capacity connections...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28058442/%C3%AF-phosphorene-a-new-allotrope-of-phosphorene
#4
Haidi Wang, Xingxing Li, Zhao Liu, Jinlong Yang
Based on the crystal structure prediction, we propose a new allotrope of phosphorene, ψ-phosphorene (ψ-P), with a porous structure, which is both thermally and dynamically stable in comparison with the previously reported allotropes. Due to its unique atom configuration, ψ-P has highly orientation-dependent mechanical properties and excellent flexibility. Calculations using the HSE functional predict that ψ-P is semiconducting with an indirect band gap of 1.57 eV and possesses anisotropic transport properties...
January 6, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28054603/large-scale-synthesis-of-uniform-hexagonal-boron-nitride-films-by-plasma-enhanced-atomic-layer-deposition
#5
Hamin Park, Tae Keun Kim, Sung Woo Cho, Hong Seok Jang, Sang Ick Lee, Sung-Yool Choi
Hexagonal boron nitride (h-BN) has been previously manufactured using mechanical exfoliation and chemical vapor deposition methods, which make the large-scale synthesis of uniform h-BN very challenging. In this study, we produced highly uniform and scalable h-BN films by plasma-enhanced atomic layer deposition, which were characterized by various techniques including atomic force microscopy, transmission electron microscopy, Raman spectroscopy, and X-ray diffraction. The film composition studied by X-ray photoelectron spectroscopy and Auger electron spectroscopy corresponded to a B:N stoichiometric ratio close to 1:1, and the band-gap value (5...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28054071/structural-elastic-electronic-and-optical-properties-of-the-tricycle-like-phosphorene
#6
Yang Zhang, Zhi-Feng Wu, Peng-Fei Gao, Dang-Qi Fang, Er-Hu Zhang, Sheng-Li Zhang
Phosphorene exhibits great potential applications in nanoelectronics due to its relatively large and direct band gap and good charge carrier mobility, and thus has attracted extensive attentions over the past few years. In this study, a novel hybrid phosphorene with a tricycle-like bulge is proposed using density functional theory calculations. Herein, structural stability, elastic, electronic, and optical properties have been addressed. It is found that all the hybrid phosphorenes are stable, and their cohesive energies are very close to that of black phosphorene monolayer...
January 5, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28054045/solution-processing-of-two-dimensional-black-phosphorus
#7
Edward A Lewis, Jack R Brent, Brian Derby, Sarah J Haigh, David J Lewis
Phosphorene, or two-dimensional (2D) black phosphorus (BP) was the first synthetic 2D elemental allotrope beyond graphene to be isolated and studied. It is useful due to its high p-type carrier mobility and direct band gap that is tunable in the range ca. 0.3-2 eV thus bridging the energy gap between graphene and transition metal dichalcogenides such as molybdenum disulfide. Beyond the 'Scotch-Tape' method that was used to isolate the first samples of 2D BP for prototype studies, a range of potentially scalable solution processing techniques emerged later that can produce electronics grade material...
January 5, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28054044/enhancing-the-low-energy-absorption-band-and-charge-mobility-of-antiaromatic-ni-ii-norcorroles-by-their-substituent-effects
#8
Takuya Yoshida, Daisuke Sakamaki, Shu Seki, Hiroshi Shinokubo
Dissymmetrical substitution of norcorrole enables the preparation of various norcorrole derivatives as air- and moisture-stable species. Intramolecular charge transfer interactions between electron-donating substituents and the norcorrole core in these norcorroles significantly enhanced their low-energy absorption bands, which were forbidden in symmetrical Ni(II) dimesitylnorcorrole.
January 5, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28052568/0d-2d-heterojunctions-of-vanadate-quantum-dots-graphitic-carbon-nitride-nanosheets-for-enhanced-visible-light-driven-photocatalysis
#9
Meng-Yang Ye, Zhi-Hao Zhao, Zhuo-Feng Hu, Le-Quan Liu, Hui-Ming Ji, Zhu-Rui Shen, Tian-Yi Ma
0D/2D heterojunctions, especially quantum dots (QDs)/nanosheets (NSs) have attracted significant attention for use of photoexcited electrons/holes due to their high charge mobility. Herein, unprecedent heterojunctions of vanadate (AgVO3 , BiVO4 , InVO4 and CuV2 O6 ) QDs/graphitic carbon nitride (g-C3 N4 ) NSs exhibiting multiple unique advances beyond traditional 0D/2D composites have been developed. The photoactive contribution, up-conversion absorption, and nitrogen coordinating sites of g-C3 N4 NSs, highly dispersed vanadate nanocrystals, as well as the strong coupling and band alignment between them lead to superior visible-light-driven photoelectrochemical (PEC) and photocatalytic performance, competing with the best reported photocatalysts...
January 4, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28051184/strain-modulated-electronic-structure-and-infrared-light-adsorption-in-palladium-diselenide-monolayer
#10
Xiaobiao Liu, Hongcai Zhou, Bo Yang, Yuanyuan Qu, Mingwen Zhao
Two-dimensional (2D) transition-metal dichalcogenides (TMDs) exhibit intriguing properties for both fundamental research and potential application in fields ranging from electronic devices to catalysis. Based on first-principles calculations, we proposed a stable form of palladium diselenide (PdSe2) monolayer that can be synthesized by selenizing Pd(111) surface. It has a moderate band gap of about 1.10 eV, a small in-plane stiffness, and electron mobility larger than that of monolayer black phosphorus by more than one order...
January 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28042863/evaluating-the-more-suitable-ism-frequency-band-for-iot-based-smart-grids-a-quantitative-study-of-915-mhz-vs-2400-mhz
#11
Ruben M Sandoval, Antonio-Javier Garcia-Sanchez, Felipe Garcia-Sanchez, Joan Garcia-Haro
IoT has begun to be employed pervasively in industrial environments and critical infrastructures thanks to its positive impact on performance and efficiency. Among these environments, the Smart Grid (SG) excels as the perfect host for this technology, mainly due to its potential to become the motor of the rest of electrically-dependent infrastructures. To make this SG-oriented IoT cost-effective, most deployments employ unlicensed ISM bands, specifically the 2400 MHz one, due to its extended communication bandwidth in comparison with lower bands...
December 31, 2016: Sensors
https://www.readbyqxmd.com/read/28040939/design-and-characterization-of-microstrip-based-e-field-sensor-for-gsm-and-umts-frequency-bands
#12
N Narang, S K Dubey, P S Negi, V N Ojha
An Electric (E-) field sensor based on coplanar waveguide-fed microstrip antenna to measure E-field strength for dual-band operation at 914 MHz and 2.1 GHz is proposed, designed, and characterized. The parametric optimization of the design has been performed to obtain resonance at global system for mobile communication and universal mobile telecommunication system frequency band. Low return loss (-17 dB and -19 dB), appropriate gain (0.50 dB and 1.55 dB), and isotropic behaviour (directivity ∼ 1 dB), respectively, at 914 MHz and 2...
December 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28038972/personal-radiofrequency-electromagnetic-field-exposure-measurements-in-swiss-adolescents
#13
Katharina Roser, Anna Schoeni, Benjamin Struchen, Marco Zahner, Marloes Eeftens, Jürg Fröhlich, Martin Röösli
BACKGROUND: Adolescents belong to the heaviest users of wireless communication devices, but little is known about their personal exposure to radiofrequency electromagnetic fields (RF-EMF). OBJECTIVES: The aim of this paper is to describe personal RF-EMF exposure of Swiss adolescents and evaluate exposure relevant factors. Furthermore, personal measurements were used to estimate average contributions of various sources to the total absorbed RF-EMF dose of the brain and the whole body...
December 27, 2016: Environment International
https://www.readbyqxmd.com/read/28036219/linear-magnetoresistance-in-a-quasifree-two-dimensional-electron-gas-in-an-ultrahigh-mobility-gaas-quantum-well
#14
T Khouri, U Zeitler, C Reichl, W Wegscheider, N E Hussey, S Wiedmann, J C Maan
We report a high-field magnetotransport study of an ultrahigh mobility (μ[over ¯]≈25×10^{6}  cm^{2} V^{-1} s^{-1}) n-type GaAs quantum well. We observe a strikingly large linear magnetoresistance (LMR) up to 33 T with a magnitude of order 10^{5}% onto which quantum oscillations become superimposed in the quantum Hall regime at low temperature. LMR is very often invoked as evidence for exotic quasiparticles in new materials such as the topological semimetals, though its origin remains controversial...
December 16, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/28032606/melt-growth-and-properties-of-bulk-basno3-single-crystals
#15
Z Galazka, R Uecker, K Irmscher, D Klimm, R Bertram, A Kwasniewski, M Naumann, R Schewski, M Pietsch, U Juda, A Fiedler, M Albrecht, S Ganschow, T Markurt, C Guguschev, M Bickermann
We present the first-time growth of bulk BaSnO3 single crystals from the melt by direct solidification, their basic electrical and optical properties as well as their structural quality. Our measurement of the melting point (MP) of BaSnO3 amounts to 1855 °C  ±  25 K. At this temperature an intensive decomposition and non-stoichiometric evaporation takes place as the partial pressure of SnO(g) is about 90 times higher than that of BaO(g). X ray powder diffraction identified only the BaSnO3 perovskite phase, while narrow rocking curves having a full width at half maximum of 26 arcsec and etch pit densities below 10(6) cm(-2) confirm a high degree of structural perfection of the single crystals...
February 22, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28024350/some-like-it-flat-decoupled-h-bn-monolayer-substrates-for-aligned-graphene-growth
#16
Silvan Roth, Thomas Greber, Jürg Osterwalder
On the path to functional graphene electronics, suitable templates for chemical vapor deposition (CVD) growth of high-mobility graphene are of great interest. Among various substrates, hexagonal boron nitride (h-BN) has established itself as one of the most promising candidates. The nanomesh, a h-BN monolayer grown on the Rh(111) surface where the lattice mismatch of h-BN and rhodium leads to a characteristic corrugation of h-BN, offers an interesting graphene/h-BN interface, different from flat graphene/h-BN systems hitherto studied...
December 27, 2016: ACS Nano
https://www.readbyqxmd.com/read/28005333/spin-orbit-coupling-induced-gap-in-graphene-on-pt-111-with-intercalated-pb-monolayer
#17
Ilya I Klimovskikh, Mikhail M Otrokov, Vladimir Yu Voroshnin, Daria Sostina, Luca Petaccia, Giovanni Di Santo, Sangeeta Thakur, Evgueni V Chulkov, Alexander M Shikin
Graphene is one of the most promising materials for nanoelectronics owing to its unique Dirac cone-like dispersion of the electronic state and high mobility of the charge carriers. However, to facilitate the implementation of the graphene-based devices, an essential change of its electronic structure, a creation of the band gap should controllably be done. Brought about by two fundamentally different mechanisms, a sublattice symmetry breaking or an induced strong spin-orbit interaction, the band gap appearance can drive graphene into a narrow-gap semiconductor or a 2D topological insulator phase, respectively, both cases being technologically relevant...
December 22, 2016: ACS Nano
https://www.readbyqxmd.com/read/28004581/precise-side-chain-engineering-of-thienylenevinylene-benzotriazole-based-conjugated-polymers-with-coplanar-backbone-for-organic-field-effect-transistors-and-cmos-like-inverters
#18
Min-Hye Lee, Juhwan Kim, Minji Kang, Jihong Kim, Boseok Kang, Hansu Hwang, Kilwon Cho, Dong-Yu Kim
Two donor-acceptor (D-A) alternating conjugated polymers based on thienylenevinylene-benzotriazole (TV-BTz), PTV6B with a linear side chain and PTVEhB with a branched side chain, were synthesized and characterized for organic field effect transistors (OFETs) and complementary metal-oxide-semiconductor (CMOS)-like inverters. According to density functional theory (DFT), polymers based on TV-BTz exhibit a coplanar and rigid structure with no significant twists, which could cause to an increase in charge-carrier mobility in OFETs...
January 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28002942/atomic-scale-study-on-growth-and-heteroepitaxy-of-zno-monolayer-on-graphene
#19
Hyo-Ki Hong, Junhyeon Jo, Daeyeon Hwang, Jongyeong Lee, Na Yeon Kim, Seungwoo Son, Jung Hwa Kim, Mi-Jin Jin, Young Chul Jun, Rolf Erni, Sang Kyu Kwak, Jung-Woo Yoo, Zonghoon Lee
Atomically thin semiconducting oxide on graphene carries a unique combination of wide band gap, high charge carrier mobility, and optical transparency, which can be widely applied for optoelectronics. However, study on the epitaxial formation and properties of oxide monolayer on graphene remains unexplored due to hydrophobic graphene surface and limits of conventional bulk deposition technique. Here, we report atomic scale study of heteroepitaxial growth and relationship of a single-atom-thick ZnO layer on graphene using atomic layer deposition...
December 8, 2016: Nano Letters
https://www.readbyqxmd.com/read/27984482/time-to-update-the-gross-motor-function-classification-system-gmfcs-for-early-age-bands-by-incorporation-of-assisted-mobility
#20
Tjitske Hielkema, Anke G Boxum, Elisa G Hamer, Jan H B Geertzen, Mijna Hadders-Algra
No abstract text is available yet for this article.
January 2017: Pediatric Physical Therapy
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