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https://www.readbyqxmd.com/read/29346280/a-multi-band-body-worn-distributed-radio-frequency-exposure-meter-design-on-body-calibration-and-study-of-body-morphology
#1
Reza Aminzadeh, Arno Thielens, Sam Agneessens, Patrick Van Torre, Matthias Van den Bossche, Stefan Dongus, Marloes Eeftens, Anke Huss, Roel Vermeulen, René de Seze, Paul Mazet, Elisabeth Cardis, Hendrik Rogier, Martin Röösli, Luc Martens, Wout Joseph
A multi-band Body-Worn Distributed exposure Meter (BWDM) calibrated for simultaneous measurement of the incident power density in 11 telecommunication frequency bands, is proposed. The BDWM consists of 22 textile antennas integrated in a garment and is calibrated on six human subjects in an anechoic chamber to assess its measurement uncertainty in terms of 68% confidence interval of the on-body antenna aperture. It is shown that by using multiple antennas in each frequency band, the uncertainty of the BWDM is 22 dB improved with respect to single nodes on the front and back of the torso and variations are decreased to maximum 8...
January 18, 2018: Sensors
https://www.readbyqxmd.com/read/29343601/the-evolution-of-sexual-signal-modes-and-associated-sensor-morphology-in-fireflies-lampyridae-coleoptera
#2
Kathrin F Stanger-Hall, Sarah E Sander Lower, Lauri Lindberg, Andrew Hopkins, Jenna Pallansch, David W Hall
Animals employ different sexual signal modes (e.g. visual, acoustic, chemical) in different environments and behavioural contexts. If sensory structures are costly, then evolutionary shifts in primary signal mode should be associated with changes in sensor morphology. Further, sex differences are expected if male and female signalling behaviours differ. Fireflies are known for their light displays, but many species communicate exclusively with pheromones, including species that recently lost their light signals...
January 31, 2018: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/29342305/analysis-of-electric-field-strength-and-power-around-selected-mobile-base-stations
#3
P Deatanyah, J K Amoako, E K K Abavare, A Menyeh
The analysis of channel power and electric field strength at various locations from mobile base stations using power sensor, spectrum analyzer and log-periodic antenna revealed maximum potential exposure between the range of 61.1 and 254.7 m. Generally, the potential exposure values ranged from 0.0717 to 0.8950 mW m-2 with a maximum deviation of 22.22%. GSM900 was found to be more pronounced than GSM1800 and UMTS2100. Though the results complied with ICNIRP reference levels with a wide margin of 0.01%, it was higher than some previous work and South African mean value of 0...
January 12, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29341302/twisted-charge-transfer-antennas-for-ultra-bright-terbium-iii-and-dysprosium-iii-bioprobes
#4
Anh Thy Bui, Amandine Roux, Alexei Grichine, Alain Duperray, Chantal Andraud, Olivier Maury
The design of original twisted charge transfer antennas where a non planar geometry is enforced thanks to one or two bulky ortho-Me substituents allows us to prepare the corresponding ultra-bright Tb(III) and Dy(III) bioprobes. The brightness of the Tb(III) derivative compares well with that of the benchmark Tb-Lumi4 complex. The first bio-imaging experiments with a Dy(III) luminescent bioprobe are also reported.
January 17, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29339023/calculated-shape-dependence-of-electromagnetic-field-in-tip-enhanced-raman-scattering-by-using-a-monopole-antenna-model
#5
Yasutaka Kitahama, Tamitake Itoh, Toshiaki Suzuki
To evaluate the shape of an Ag tip with regard to tip-enhanced Raman scattering (TERS) signal, the enhanced electromagnetic (EM) field and scattering spectrum, arising from surface plasmon resonance at the apex of the tip, were calculated using a finite-difference time domain (FDTD) method. In the calculated forward scattering spectra from the smooth Ag tip, the band appeared within the visible region, similar to the experimental results and calculation for a corrugated Ag cone. In the FDTD calculation of TERS, the Ag tip acting as a monopole antenna was adopted by insertion of a perfect electric conductor between the root of the tip and a top boundary surface of the calculation space...
January 5, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29337914/acoustic-transducers-as-passive-cooperative-targets-for-wireless-sensing-of-the-sub-surface-world-challenges-of-probing-with-ground-penetrating-radar
#6
Jean-Michel Friedt, Gilles Martin, Gwenhael Goavec-Mérou, David Rabus, Sébastien Alzuaga, Lilia Arapan, Marianne Sagnard, Émile Carry
Passive wireless transducers are used as sensors, probed by a RADAR system. A simple way to separate the returning signal from the clutter is to delay the response, so that the clutter decays before the echoes are received. This can be achieved by introducing a fixed delay in the sensor design. Acoustic wave transducers are ideally suited as cooperative targets for passive, wireless sensing. The incoming electromagnetic pulse is converted into an acoustic wave, propagated on the sensor substrate surface, and reflected as an electromagnetic echo...
January 16, 2018: Sensors
https://www.readbyqxmd.com/read/29337884/monitoring-strategies-of-earth-dams-by-ground-based-radar-interferometry-how-to-extract-useful-information-for-seismic-risk-assessment
#7
Andrea Di Pasquale, Giovanni Nico, Alfredo Pitullo, Giuseppina Prezioso
The aim of this paper is to describe how ground-based radar interferometry can provide displacement measurements of earth dam surfaces and of vibration frequencies of its main concrete infrastructures. In many cases, dams were built many decades ago and, at that time, were not equipped with in situ sensors embedded in the structure when they were built. Earth dams have scattering properties similar to landslides for which the Ground-Based Synthetic Aperture Radar (GBSAR) technique has been so far extensively applied to study ground displacements...
January 16, 2018: Sensors
https://www.readbyqxmd.com/read/29337581/light-harvesting-by-equally-contributing-mechanisms-in-a-photosynthetic-antenna-protein
#8
Matthew J Guberman-Pfeffer, Jordan A Greco, Robert Richards Birge, Harry A Frank, José A Gascón
We report supramolecular quantum mechanics/molecular mechanics simulations on the peridinin-chlorophyll a protein (PCP) complex from the causative algal species of red tides. These calculations reproduce for the first time quantitatively the distinct peridinin absorptions, identify multichromophoric molecular excitations, and elucidate the mechanisms regulating the strongly-allowed S0 (11Ag-) → S2 (11Bu+) absorptions of the bound peridinins that span a 58 nm spectral range in the region of maximal solar irradiance...
January 16, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29337089/thermal-field-distributions-of-ablative-experiments-using-cyst-mimicking-phantoms-comparison-of-microwave-and-radiofrequency-ablation
#9
Xiao-Wen Huang, Fang Nie, Zeng-Cheng Wa, Hang-Tong Hu, Qing-Xiu Huang, Huan-Ling Guo, Qiao Zheng, Xiao-Yan Xie, Wei Wang, Ming-De Lu
RATIONALE AND OBJECTIVES: The objective of this study was to explore the thermal field distribution of cystic lesions undergoing microwave ablation (MWA) and radiofrequency ablation (RFA) using in vitro phantoms. MATERIALS AND METHODS: Cyst-mimicking lesions filled with sodium chloride (NaCl) solution in acrylamide phantoms were treated with MWA and RFA in vitro. The radiofrequency electrodes or MWA antennas were implanted in the centers of the artificial cystic lesions...
January 11, 2018: Academic Radiology
https://www.readbyqxmd.com/read/29334982/genome-wide-identification-characterization-and-classification-of-ionotropic-glutamate-receptor-genes-iglurs-in-the-malaria-vector-anopheles-sinensis-diptera-culicidae
#10
Ting-Ting Wang, Feng-Ling Si, Zheng-Bo He, Bin Chen
BACKGROUND: Ionotropic glutamate receptors (iGluRs) are conserved ligand-gated ion channel receptors, and ionotropic receptors (IRs) were revealed as a new family of iGluRs. Their subdivision was unsettled, and their characteristics are little known. Anopheles sinensis is a major malaria vector in eastern Asia, and its genome was recently well sequenced and annotated. METHODS: We identified iGluR genes in the An. sinensis genome, analyzed their characteristics including gene structure, genome distribution, domains and specific sites by bioinformatic methods, and deduced phylogenetic relationships of all iGluRs in An...
January 15, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29330721/transcriptomic-analysis-and-discovery-of-genes-in-the-response-of-arachis-hypogaea-to-drought-stress
#11
Xiaobo Zhao, Chunjuan Li, Shubo Wan, Tingting Zhang, Caixia Yan, Shihua Shan
The peanut (Arachis hypogaea) is an important crop species that is threatened by drought stress. The genome sequences of peanut, which was officially released in 2016, may help explain the molecular mechanisms that underlie drought tolerance in this species. We report here a gene expression profiling of A. hypogaea to gain a global view of its drought resistance. Using whole-transcriptome sequencing, we analysed differential gene expression in response to drought stress in the drought-resistant peanut cultivar J11...
January 12, 2018: Molecular Biology Reports
https://www.readbyqxmd.com/read/29329248/performance-analysis-of-millimeter-wave-multi-hop-machine-to-machine-networks-based-on-hop-distance-statistics
#12
Haejoon Jung, In-Ho Lee
As an intrinsic part of the Internet of Things (IoT) ecosystem, machine-to-machine (M2M) communications are expected to provide ubiquitous connectivity between machines. Millimeter-wave (mmWave) communication is another promising technology for the future communication systems to alleviate the pressure of scarce spectrum resources. For this reason, in this paper, we consider multi-hop M2M communications, where a machine-type communication (MTC) device with the limited transmit power relays to help other devices using mmWave...
January 12, 2018: Sensors
https://www.readbyqxmd.com/read/29329243/characteristics-of-beidou-navigation-satellite-system-multipath-and-its-mitigation-method-based-on-kalman-filter-and-rauch-tung-striebel-smoother
#13
Qiuzhao Zhang, Wei Yang, Shubi Zhang, Xin Liu
Global Navigation Satellite System (GNSS) carrier phase measurement for short baseline meets the requirements of deformation monitoring of large structures. However, the carrier phase multipath effect is the main error source with double difference (DD) processing. There are lots of methods to deal with the multipath errors of Global Position System (GPS) carrier phase data. The BeiDou navigation satellite System (BDS) multipath mitigation is still a research hotspot because the unique constellation design of BDS makes it different to mitigate multipath effects compared to GPS...
January 12, 2018: Sensors
https://www.readbyqxmd.com/read/29328131/low-cost-three-dimensional-millimeter-wave-holographic-imaging-system-based-on-a-frequency-scanning-antenna
#14
Vahid Amin Nili, Ehsan Mansouri, Zahra Kavehvash, Mohammad Fakharzadeh, Mahdi Shabany, Amin Khavasi
In this paper, a closed-form two-dimensional reconstruction technique for hybrid frequency and mechanical scanning millimeter-wave (MMW) imaging systems is proposed. Although being commercially implemented in many imaging systems as a low-cost real-time solution, the results of frequency scanning systems have been reconstructed numerically or have been reported as the captured raw data with no clear details. Furthermore, this paper proposes a new framework to utilize the captured data of different frequencies for three-dimensional (3D) reconstruction based on novel proposed closed-form relations...
January 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328103/mode-diversity-of-weakly-modulated-cavity-antennas
#15
Daniel L Marks, David R Smith
The radiating mode of a cavity antenna at a particular frequency is fixed. However, by actively modulating the permittivity inside the cavity, the radiating mode may be changed. Using time-independent perturbation theory, we derive the modes of a cavity perturbed by many modulating elements. It is found that with a sufficient number of modulators of sufficient strength, the number of unique fields radiated by the cavity may reach a limit determined by the number of unperturbed cavity modes. The number of addressable radiated fields increases exponentially with the number of modulators; however, perturbations involving the interaction of several modulators become progressively weaker...
January 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29328094/matched-and-wideband-flat-lens-antennas-using-symmetric-graded-dielectrics
#16
Mohammad Khalaj-Amirhosseini, Mohammad-Mahdi Taskhiri
Matched and wideband flat lens antennas using a two-dimensional symmetric graded dielectric (SGD) are considered. An explicit relation for refractive index of this type of antenna is presented. This design relation is obtained in two steps. The variations of refractive index are determined first in the radial direction and then in the axial direction. Additionally, reflector-lens antennas are introduced using two-dimensional SGD. The validity of design methodology is verified by simulation.
January 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
https://www.readbyqxmd.com/read/29327416/comparative-proteomics-studies-of-insect-cuticle-by-tandem-mass-spectrometry-application-of-a-novel-proteomics-approach-to-the-pea-aphid-cuticular-proteins
#17
Masson Victor, Arafah Karim, Voisin Sébastien, Bulet Philippe
The exoskeleton of arthropods, called cuticle, is a biological composite material consisting principally of N-acetylglucosamine polymer embedded in cuticular proteins (CPs). The CPs have been studied and characterized by mass spectrometry in several cuticular structures and in many arthropods. Such analyses were usually carried out by protein extraction using SDS detergent followed by electrophoresis, allowing detection and identification of a large number of CPs. To build a repertoire of cuticular structures from Bombyx mori, Apis mellifera and Anopheles gambiae we avoided the use of SDS and electrophoresis...
January 12, 2018: Proteomics
https://www.readbyqxmd.com/read/29322483/structural-integrity-of-synechocystis-sp-pcc-6803-phycobilisomes-evaluated-by-means-of-differential-scanning-calorimetry
#18
Nia Petrova, Svetla Todinova, Hajnalka Laczko-Dobos, Tomas Zakar, Sindhujaa Vajravel, Stefka Taneva, Zoltan Gombos, Sashka Krumova
Phycobilisomes (PBSs) are supramolecular pigment-protein complexes that serve as light-harvesting antennae in cyanobacteria. They are built up by phycobiliproteins assembled into allophycocyanin core cylinders (ensuring the physical interaction with the photosystems) and phycocyanin rods (protruding from the cores and having light-harvesting function), the whole PBSs structure being maintained by linker proteins. PBSs play major role in light-harvesting optimization in cyanobacteria; therefore, the characterization of their structural integrity in intact cells is of great importance...
January 10, 2018: Photosynthesis Research
https://www.readbyqxmd.com/read/29320203/electronically-tunable-perfect-absorption-in-graphene
#19
Seyoon Kim, Min Seok Jang, Victor W Brar, Kelly W Mauser, Laura Kim, Harry A Atwater
The demand for dynamically tunable light modulation in flat optics applications has grown in recent years. Graphene nanostructures have been extensively studied as means of creating large effective index tunability, motivated by theoretical predictions of the potential for unity absorption in resonantly-excited graphene nanostructures. However, the poor radiative coupling to graphene plasmonic nanoresonators and low graphene carrier mobilities from imperfections in processed graphene samples have led to low modulation depths in experimental attempts at creating tunable absorption in graphene devices...
January 10, 2018: Nano Letters
https://www.readbyqxmd.com/read/29318991/in-vitro-investigation-of-the-pediculicidal-activities-of-the-volatile-oil-components-of-some-medical-plants-raised-in-turkey
#20
M Emin Limoncu, Cüneyt Balcıoğlu, Tuğba Oyur, Gizem Zeybek, Ulvi Zeybek
OBJECTIVE: The human head louse Pediculus capitis has recently acquired resistance to commercially available insecticides, which has expanded the search concerning the pediculicidal activities of some herbal products. The present study aimed to assess the in vitro pediculicidal activities of volatile oils extracted from 10 medical plants raised in Turkey: Rosa damascena (red provins rose), Pelargonium graveolens (geranium), Lavandula angustifolia (lavender), Salvia triloba (salvia), Rosmarinus officinalis (rosemary; two different chemotypes), Citrus bergamia (citrus tree), Cymbopogon nardus (citronella), Citrus limonum (lemon), and Cymbopogon flexuosus (lemongrass)...
December 2017: Türkiye Parazitolojii Dergisi
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