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https://www.readbyqxmd.com/read/28821726/the-switching-of-strong-spin-wave-beams-in-patterned-garnet-films
#1
R Gieniusz, P Gruszecki, M Krawczyk, U Guzowska, A Stognij, A Maziewski
The application of spin waves in communication with information encoded in amplitude and phase could replace or enhance existing microelectronic and microwave devices with significantly decreased energy consumption. Spin waves (SW) are usually transported in a magnetic material shaped to act as a waveguide. However, the implementation of SW transport and switching in plane homogeneous magnetic films and running as a narrow beam with a small divergence angle still present a challenge. We propose a realization of a strong SW switchers based on a patterned yttrium iron garnet (YIG) film that could serve as a magnonic fundamental building block...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821651/role-of-somatostatin-positive-cortical-interneurons-in-the-generation-of-sleep-slow-waves
#2
Chadd M Funk, Kayla Peelman, Michele Bellesi, William Marshall, Chiara Cirelli, Giulio Tononi
During non-rapid eye movement (NREM) sleep cortical and thalamic neurons oscillate every second or so between ON periods characterized by membrane depolarization and wake-like tonic firing, and OFF periods characterized by membrane hyperpolarization and neuronal silence. Cortical slow waves - the hallmark of NREM sleep - reflect near-synchronous OFF periods in cortical neurons. However, the mechanisms triggering such OFF periods are unclear, as there is little evidence for somatic inhibition. We studied cortical inhibitory interneurons that express somatostatin (SOM), because ∼70% of them are Martinotti cells that target diffusely layer I and can block excitatory transmission presynaptically, at glutamatergic terminals, and postsynaptically, at apical dendrites, without inhibiting the soma...
August 16, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28820573/magnetically-aligned-co-c-mwcnts-composite-derived-from-mwcnts-interconnected-zeolitic-imidazolate-frameworks-for-lightweight-and-highly-efficient-electromagnetic-wave-absorber
#3
Yichao Yin, Xiaofang Liu, Xiaojun Wei, Ya Li, Xiaoyu Nie, Ronghai Yu, Jianglan Shui
Developing lightweight and highly efficient electromagnetic wave (EMW) absorbing materials is crucial but challenging for anti-electromagnetic irradiation and interference. Herein, we used MWCNTs as templates for growth of Co-based zeolitic imidazolate frameworks (ZIFs), and obtained Co-C/MWCNTs composite by post pyrolysis. The MWCNTs interconnected the ZIF-derived Co-C porous particles, constructing a conductive network for electron hopping and migration. Moreover, the Co-C/MWCNTs composite was aligned in paraffin matrix under an external magnetic field, which led to the stretch of MWCNTs along the magnetic field direction...
August 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28819642/from-the-generalized-reflection-law-to-the-realization-of-perfect-anomalous-reflectors
#4
Ana Díaz-Rubio, Viktar S Asadchy, Amr Elsakka, Sergei A Tretyakov
The use of the generalized Snell's law opens wide possibilities for the manipulation of transmitted and reflected wavefronts. However, known structures designed to shape reflection wavefronts suffer from significant parasitic reflections in undesired directions. We explore the limitations of the existing solutions for the design of passive planar reflectors and demonstrate that strongly nonlocal response is required for perfect performance. A new paradigm for the design of perfect reflectors based on energy surface channeling is introduced...
August 2017: Science Advances
https://www.readbyqxmd.com/read/28817764/limited-functioning-after-remission-of-an-anxiety-disorder-as-a-trait-effect-versus-a-scar-effect-results-of-a-longitudinal-general-population-study
#5
Simone M E Schopman, Margreet Ten Have, Saskia van Dorsselaer, Ron de Graaf, Neeltje M Batelaan
OBJECTIVE: After remission of an anxiety disorder, subjects often experience persistent functional impairments. We examined whether impairments in mental and physical functioning following remission are a continuation of premorbid lower functioning (trait effect), due to impairments that develop during the anxiety disorder and persist beyond recovery (scar effect), or both. METHODS: Data were derived from the Netherlands Mental Health Survey and Incidence Study-2 (NEMESIS-2), a prospective psychiatric epidemiologic study among the general population with a 3-wave design (6-year follow-up, with the study starting in 2007 and ending in 2015)...
August 15, 2017: Journal of Clinical Psychiatry
https://www.readbyqxmd.com/read/28812868/light-and-strong-hierarchical-porous-sic-foam-for-efficient-electromagnetic-interference-shielding-and-thermal-insulation-at-elevated-temperatures
#6
Caiyun Liang, Zhenfeng Wang, Lina Wu, Xiaochen Zhang, Huan Wang, Zhijiang Wang
A novel light but strong SiC foam with hierarchical porous architecture are fabricated by using dough as raw material via carbonization and followed carbothermal reduction with silicon source. A significant synergistic effect is achieved by embedding meso and nano pores in micro-sized porous skeleton, which endows the SiC foam with high-performance electromagnetic interference shielding (EMI), thermal insulation and mechanical properties. The micro-sized skeleton withstands the high stress. The meso- and nano-sized pores enhance the multiple reflection of the incident electromagnetic waves and elongate the path of heat transfer...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28811484/sea-of-majorana-fermions-from-pseudo-scalar-superconducting-order-in-three-dimensional-dirac-materials
#7
Morteza Salehi, S A Jafari
We suggest that spin-singlet pseudo-scalar s-wave superconducting pairing creates a two dimensional sea of Majorana fermions on the surface of three dimensional Dirac superconductors (3DDS). This pseudo-scalar superconducting order parameter Δ5, in competition with scalar Dirac mass m, leads to a topological phase transition due to band inversion. We find that a perfect Andreev-Klein reflection is guaranteed by presence of anomalous Andreev reflection along with the conventional one. This effect manifests itself in a resonant peak of the differential conductance...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28808435/double-cone-of-eigendirections-in-optically-active-ethylenediammonium-selenate-crystals
#8
Alexander T Martin, Shane M Nichols, Sichao Li, Melissa Tan, Bart Kahr
Circular birefringence (CB) is generally responsible for only a small perturbation to the state of light polarization in crystals that also exhibit linear birefringence (LB). As such, the magnetoelectric tensor of gyration, which gives rise to CB and optical activity, is less well determined than the electric permittivity tensor in optical models of the Mueller matrix. To visualize the effect of the magnetoelectric tensor on polarimetric measurements, reported here are experimental mappings of the Mueller matrix and of the CB in a new chiral crystal with accidental null LB at an accessible optical frequency...
August 1, 2017: Journal of Applied Crystallography
https://www.readbyqxmd.com/read/28808250/polarization-tunable-all-dielectric-color-filters-based-on-cross-shaped-si-nanoantennas
#9
Vishal Vashistha, Gayatri Vaidya, Pawel Gruszecki, Andriy E Serebryannikov, Maciej Krawczyk
Polarization sensitive and insensitive color filters have important applications in the area of nano-spectroscopy and CCD imaging applications. Metallic nanostructures provide an efficient way to design and engineer ultrathin color filters. These nanostructures have capability to split the white light into fundamental colors and enable color filters with ultrahigh resolution but their efficiency can be restricted due to high losses in metals especially at the visible wavelengths. In this work, we demonstrate all-dielectric color filters based on Si nanoantennas, which are sensitive to incident-wave polarization and, thus, tunable with the aid of polarization angle variation...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28805436/event-related-potentials-discriminate-familiar-and-unusual-goal-outcomes-in-5-month-olds-and-adults
#10
Christine Michel, Katharina Kaduk, Áine Ní Choisdealbha, Vincent M Reid
Previous event-related potential (ERP) work has indicated that the neural processing of action sequences develops with age. Although adults and 9-month-olds use a semantic processing system, perceiving actions activates attentional processes in 7-month-olds. However, presenting a sequence of action context, action execution and action conclusion could challenge infants' developing working memory capacities. A shortened stimulus presentation of a highly familiar action, presenting only the action conclusion of an eating action, may therefore enable semantic processing in even younger infants...
August 14, 2017: Developmental Psychology
https://www.readbyqxmd.com/read/28801517/effect-of-densely-ionizing-radiation-on-cardiomyocyte-differentiation-from-human-induced-pluripotent-stem-cells
#11
Erdene Baljinnyam, Sundararajan Venkatesh, Richard Gordan, Satvik Mareedu, Jianyi Zhang, Lai-Hua Xie, Edouard I Azzam, Carolyn K Suzuki, Diego Fraidenraich
The process of human cardiac development can be faithfully recapitulated in a culture dish with human pluripotent stem cells, where the impact of environmental stressors can be evaluated. The consequences of ionizing radiation exposure on human cardiac differentiation are largely unknown. In this study, human-induced pluripotent stem cell cultures (hiPSCs) were subjected to an external beam of 3.7 MeV α-particles at low mean absorbed doses of 0.5, 3, and 10 cGy. Subsequently, the hiPSCs were differentiated into beating cardiac myocytes (hiPSC-CMs)...
August 2017: Physiological Reports
https://www.readbyqxmd.com/read/28800493/efficient-simulation-of-elastic-guided-waves-interacting-with-notches-adhesive-joints-delaminations-and-inclined-edges-in-plate-structures
#12
Hauke Gravenkamp
This paper presents an approach to model transmission and reflection phenomena of elastic guided waves in plates. The formulation is applied to plate structures containing notches, inclined edges, delaminations or (adhesive) joints. For these cases, only the thickness direction of the structure needs to be discretized at several locations, while the direction of propagation is described analytically. Consequently, the number of degrees of freedom is very small. Semi-infinite domains can be modeled, in which case the radiation condition is fulfilled exactly...
August 1, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28799331/flexible-sic-si3n4-composite-nanofibers-with-in-situ-embedded-graphite-for-highly-efficient-electromagnetic-wave-absorption
#13
Peng Wang, Laifei Cheng, Yani Zhang, Litong Zhang
SiC/Si3N4 composite nanofibers with in situ embedded graphite, which show highly efficient electromagnetic (EM) wave absorption performance in gigahertz frequency, were prepared by electrospinning with subsequent polymer pyrolysis and annealing. By means of incorporating graphite and Si3N4 into SiC , the EM wave absorption properties of the nanofibers were improved. The relationship among processing, fibers microstructure and their superior EM absorption performance were systematically investigated. The EM wave absorption capability, effective absorption bandwidth (EAB) of nanofibers can be simply controlled by adjusting annealing atmosphere and temperature...
August 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28797904/influence-of-inhibitory-tagging-it-on-emotional-and-cognitive-conflict-processing-evidence-from-event-related-potentials
#14
Xudong Zhao, Xiujun Li, Wendian Shi
Inhibitory tagging (IT), a flexible central control mechanism based on the current task goals, reduces the cognitive conflict effect at the cued location by blocking the incompatible stimulus-response (S-R) code. However, it is unknown whether IT has a similar effect on emotional conflict. Thus, we combined the face-word Stroop task with the manipulation of inhibition of return (IOR) and used event-related potential (ERP) technology to simultaneously examine the modulation effect of IT on emotional and cognitive conflict processing...
August 7, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28796179/design-and-implementation-of-2-45-ghz-passive-saw-temperature-sensors-with-bpsk-coded-rfid-configuration
#15
Chen Fu, Yabing Ke, Min Li, Jingting Luo, Honglang Li, Guangxing Liang, Ping Fan
A surface acoustic wave based passive temperature sensor capable of multiple access is investigated. Binary Phase Shift Keying (BPSK) codes of eight chips were implemented using a reflective delay line scheme on a Y-Z LiNbO₃ piezoelectric substrate. An accurate simulation based on the combined finite- and boundary element method (FEM/BEM) was performed in order to determine the optimum design parameters. The scaling factor 's' and time delay factor 'τ' were extracted using signal processing techniques based on the wavelet transform of the correlation function, and then evaluated at various ambient temperatures...
August 10, 2017: Sensors
https://www.readbyqxmd.com/read/28794323/development-of-an-attenuated-total-reflection-based-fiber-optic-sensor-for-real-time-sensing-of-biofilm-formation
#16
Tatsuya Orii, Takuya Okazaki, Noriko Hata, Kazuharu Sugawara, Faidz A Rahman, Hideki Kuramitz
A fiber-optic sensor capable of real-time monitoring of biofilm formation in water was developed. The sensor can be easily fabricated by removing the cladding of a multimode fiber optic to expose the core. The sensing action is based on the penetration of an evanescent wave through a biofilm formed on the surface of the exposed fiber core during total internal reflection. The proposed setup can be used to analyze the transmittance response over a wide wavelength range using a white-light source and a spectroscopy detector...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28794106/flow-mediated-dilation-and-peripheral-arterial-tonometry-are-disturbed-in-pre-eclampsia-and-reflect-different-aspects-of-endothelial-function
#17
Dominique Mannaerts, Ellen Faes, Inge Goovaerts, Tibor Stoop, Jerome Cornette, Wilfried Jozef Gyselaers, Marc E A Spaanderman, Emeline M Van Craenenbroeck, Yves Jacquemyn
BACKGROUND: Endothelial function and arterial stiffness are known to be altered in pre-eclamptic pregnancies. Previous studies have shown conflicting results regarding the best technique for assessing vascular function in pregnancy. In this study, we made a comprehensive evaluation of in vivo vascular function (including flow-mediated dilatation (FMD), peripheral arterial tonometry (PAT), and arterial stiffness) in pre-eclamptic patients and compared them to normal pregnancies. In addition, we assessed the relation between vascular function and systemic inflammation...
August 9, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28793250/mir-7-buffers-differentiation-in-the-developing-drosophila-visual-system
#18
Elizabeth E Caygill, Andrea H Brand
The 40,000 neurons of the medulla, the largest visual processing center of the Drosophila brain, derive from a sheet of neuroepithelial cells. During larval development, a wave of differentiation sweeps across the neuroepithelium, converting neuroepithelial cells into neuroblasts that sequentially express transcription factors specifying different neuronal cell fates. The switch from neuroepithelial cells to neuroblasts is controlled by a complex gene regulatory network and is marked by the expression of the proneural gene l'sc...
August 8, 2017: Cell Reports
https://www.readbyqxmd.com/read/28782310/ecg-changes-in-young-healthy-smokers-a-simple-and-cost-effective-method-to-assess-cardiovascular-risk-according-to-pack-years-of-smoking
#19
Nirmal Kumar Sharma, Kapil Kumar Jaiswal, S R Meena, Rahul Chandel, Saurabh Chittora, Prem Singh Goga, H B Harish, Rajesh Sagar
OBJECTIVE: To document the prevalence of ECG abnormalities in young healthy smokers and compare ECG changes in smokers, young healthy non-smokers and amongst smokers with different pack years. METHODS: This was a prospective case-control study consisting of 200 young healthy male and female individuals, 150 smokers and 50 non-smokers between ages 25-40 years, further categorized and compared according to age, sex and pack years of smoking. The ECG recordings were analyzed for different ECG parameters like heart rate, P-wave duration, P-wave amplitude, PR interval, QRS duration, RR-interval, ST-segment duration, QT interval and QTc interval...
June 2017: Journal of the Association of Physicians of India
https://www.readbyqxmd.com/read/28782036/deadly-heat-waves-projected-in-the-densely-populated-agricultural-regions-of-south-asia
#20
Eun-Soon Im, Jeremy S Pal, Elfatih A B Eltahir
The risk associated with any climate change impact reflects intensity of natural hazard and level of human vulnerability. Previous work has shown that a wet-bulb temperature of 35°C can be considered an upper limit on human survivability. On the basis of an ensemble of high-resolution climate change simulations, we project that extremes of wet-bulb temperature in South Asia are likely to approach and, in a few locations, exceed this critical threshold by the late 21st century under the business-as-usual scenario of future greenhouse gas emissions...
August 2017: Science Advances
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