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https://www.readbyqxmd.com/read/29346296/highly-sensitive-strain-sensor-based-on-a-novel-mach-zehnder-interferometer-with-tcf-pcf-structure
#1
Xinran Dong, Haifeng Du, Zhi Luo, Ji'an Duan
A highly sensitive strain sensor based on a novel fiber in line Mach-Zehnder interferometer (MZI) was demonstrated experimentally. The MZI was realized by splicing a section of photonic crystal fiber (PCF) with the same length of thin core fiber (TCF) between two single mode fibers (SMFs). The fringe visibility of MZI can reach as high as 20 dB in air. In particular, the strain sensitivity of -1.95 pm/με was achieved within a range from 0 to 4000 με. Furthermore, the strain properties of different length of MZI was investigated...
January 18, 2018: Sensors
https://www.readbyqxmd.com/read/29346289/himawari-8-satellite-based-dynamic-monitoring-of-grassland-fire-in-china-mongolia-border-regions
#2
Li Na, Jiquan Zhang, Yulong Bao, Yongbin Bao, Risu Na, Siqin Tong, Alu Si
In this study, we used bands 7, 4, and 3 of the Advance Himawari Imager (AHI) data, combined with a Threshold Algorithm and a visual interpretation method to monitor the entire process of grassland fires that occurred on the China-Mongolia border regions, between 05:40 (UTC) on April 19th to 13:50 (UTC) on April 21st 2016. The results of the AHI data monitoring are evaluated by the fire point product data, the wind field data, and the environmental information data of the area in which the fire took place. The monitoring result shows that, the grassland fire burned for two days and eight hours with a total burned area of about 2708...
January 18, 2018: Sensors
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
#3
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/29345630/completely-flat-two-dimensional-zn-sub-3-sub-o-sub-2-sub-monolayer-with-triangle-and-pentangle-coordinated-networks
#4
Lingbiao Meng, Yingjuan Zhang, Jicheng Zhang, Weidong Wu
Two-dimensional (2D) materials with strictly planar hyper-coordinated motifs are of great importance in fundamental science and potential applications but extremely rare. Here we theoretically design a novel 2D IIB-VIA inorganic system, namely Zn3O2 monolayer, by comprehensive first-principles computations. This Zn3O2 monolayer is composed from highly symmetrical tri-coordinated oxygen and tetra-coordinated zinc, featuring planar and peculiar triangle and pentangle combined bonded network. The newly predicted Zn3O2 monolayer possesses excellent dynamic and thermal stabilities and is also the lowest-energy structure of its 2D space indicated by particle swarm search, supporting its experimentally synthetic viability...
January 18, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29345454/stability-and-performance-of-cspbi2br-thin-films-and-solar-cell-devices
#5
Silvia Mariotti, Oliver S Hutter, Laurie J Phillips, Peter J Yates, Biswajit Kundu, Ken Durose
In this manuscript, the inorganic perovskite CsPbI2Br is investigated as a photovoltaic material that offers higher stability than the organic-inorganic hybrid perovskite materials. It is demonstrated that CsPbI2Br does not irreversibly degrade to its component salts as in the case of methylammonium lead iodide but instead is induced (by water vapor) to transform from its metastable brown cubic (1.92 eV band gap) phase to a yellow phase having a higher band gap (2.85 eV). This is easily reversed by heating to 350 °C in a dry environment...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29345243/electronic-and-mechanical-response-of-graphene-on-batio-sub-3-sub-at-martensitic-phase-transitions
#6
Tim Verhagen, Vaclav Vales, Martin Kalbac, Jana Vejpravova
Graphene is extremely sensitive to optical, electrical and mechanical stimuli, which cause a significant variation of the band structure, thus physiochemical properties. In our work, we report on changes of strain and doping in graphene grown by chemical vapor deposition (CVD) and transferred onto a BaTiO3(100) (BTO) single-crystal. The BTO is known as a ferroelectric material, which undergoes several thermoelastic martensitic phase transitions when it is cooled from 300 K to 10K. In order to enhance the very weak Raman signal of the graphene monolayer (ML) on the BTO, a 15 nm thin gold layer was deposited on top of the graphene ML to benefit from the surface enhanced Raman scattering (SERS)...
January 18, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29344812/short-term-and-long-term-effects-of-osteoporosis-on-incisor-teeth-and-femoral-bones-evaluated-by-raman-spectroscopy-and-energy-dispersive-x-ray-analysis-in-ovariectomized-rats
#7
Fernanda Rossi Paolillo, Renan Arnon Romano, Luciana de Matos, Airton Abrahão Martin, Francisco Eduardo Gontijo Guimarães, Jarbas Caiado de Castro Neto, Vanderlei Salvador Bagnato
There are few published data on the relationship between loss of bone mass due to osteoporosis and poor tooth quality. This study analyzed the effects of osteoporosis on incisor teeth and femoral bones using optical techniques in rats. Twenty female Wistar rats aged 6 months (n = 20) were randomized into two groups: control group, non-ovariectomized rats (n = 10); ovariectomy group, ovariectomized rats to induce osteoporosis (n = 10). Each group was subdivided randomly into two groups containing five rats each as follows...
January 17, 2018: Journal of Bone and Mineral Metabolism
https://www.readbyqxmd.com/read/29343982/increased-theta-band-eeg-power-in-sickle-cell-disease-patients
#8
Michelle Case, Sina Shirinpour, Huishi Zhang, Yvonne H Datta, Stephen C Nelson, Karim T Sadak, Kalpna Gupta, Bin He
Objective: Pain is a major issue in the care of patients with sickle cell disease (SCD). The mechanisms behind pain and the best way to treat it are not well understood. We studied how electroencephalography (EEG) is altered in SCD patients. Methods: We recruited 20 SCD patients and compared their resting state EEG to that of 14 healthy controls. EEG power was found across frequency bands using Welch's method. Electrophysiological source imaging was assessed for each frequency band using the eLORETA algorithm...
2018: Journal of Pain Research
https://www.readbyqxmd.com/read/29343883/magnetoelectric-effect-in-nanogranular-feco-mgf-films-at-ghz-frequencies
#9
Kenji Ikeda, Nobukiyo Kobayashi, Ken-Ichi Arai, Shin Yabukami
The magnetoelectric effect is a key issue for material science and is particularly significant in the high frequency band, where it is indispensable in industrial applications. Here, we present for the first time, a study of the high frequency tunneling magneto-dielectric (TMD) effect in nanogranular FeCo-MgF films, consisting of nanometer-sized magnetic FeCo granules dispersed in an MgF insulator matrix. Dielectric relaxation and the TMD effect are confirmed at frequencies over 10 MHz. The frequency dependence of dielectric relaxation is described by the Debye-Fröhlich model, taking relaxation time dispersion into account, which reflects variations in the nature of the microstructure, such as granule size, and the inter-spacing between the granules that affect the dielectric response...
January 15, 2018: Journal of Magnetism and Magnetic Materials
https://www.readbyqxmd.com/read/29342929/morphology-controlled-synthesis-of-hematite-nanocrystals-and-their-optical-magnetic-and-electrochemical-performance
#10
Bangquan Li, Qian Sun, Hongsheng Fan, Ming Cheng, Aixian Shan, Yimin Cui, Rongming Wang
A series of α-Fe₂O₃ nanocrystals (NCs) with fascinating morphologies, such as hollow nanoolives, nanotubes, nanospindles, and nanoplates, were prepared through a simple template-free hydrothermal synthesis process. The results showed that the morphologies could be easily controlled by SO₄2- and H₂PO₄-. Physical property analysis showed that the α-Fe₂O₃ NCs exhibited shape- and size-dependent ferromagnetic and optical behaviors. The absorption band peak of the α-Fe₂O₃ NCs could be tuned from 320 to 610 nm...
January 15, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29341652/cascade-of-magnetic-field-induced-lifshitz-transitions-in-the-ferromagnetic-kondo-lattice-material-ybni_-4-p_-2
#11
H Pfau, R Daou, S Friedemann, S Karbassi, S Ghannadzadeh, R Küchler, S Hamann, A Steppke, D Sun, M König, A P Mackenzie, K Kliemt, C Krellner, M Brando
A ferromagnetic quantum critical point is thought not to exist in two- and three-dimensional metallic systems yet is realized in the Kondo lattice compound YbNi_{4}(P,As)_{2}, possibly due to its one-dimensionality. It is crucial to investigate the dimensionality of the Fermi surface of YbNi_{4}P_{2} experimentally, but common probes such as angle-resolved photoemission spectroscopy and quantum oscillation measurements are lacking. Here, we study the magnetic-field dependence of transport and thermodynamic properties of YbNi_{4}P_{2}...
September 22, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29341604/ce3-doping-to-modulate-photoluminescence-kinetics-for-efficient-cspbbr3-nanocrystals-based-light-emitting-diodes
#12
Jisong Yao, Jing Ge, Bo-Ning Han, Kun-Hua Wang, Hong-Bin Yao, Hao-Lei Yu, Jian-Hai Li, Bai-Sheng Zhu, Jizhong Song, Chen Chen, Qun Zhang, Haibo Zeng, Yi Luo, Shu-Hong Yu
Inorganic perovskite CsPbBr3 nanocrystals (NCs) are emerging, highly attractive light emitters with high color purity and good thermal stability for light-emitting diodes (LEDs). Their high photo/electroluminescence efficiencies are very important for fabricating efficient LEDs. Here, we propose a novel strategy to enhance the photo/electroluminescence efficiency of CsPbBr3 NCs through doping of heterovalent Ce3+ ions via a facile hot-injection method. The Ce3+ cation was chosen as the dopant for CsPbBr3 NCs by virtue of its similar ion radius and formation of higher energy level of conduction band with bromine in comparison with the Pb2+ cation to maintain the integrity of perovskite structure without introducing additional trap states...
January 17, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29341422/synthesis-and-luminescence-properties-of-cubic-shaped-ca1-x-tio3-eu3-particles
#13
Shang Zhou, Hua Wang, Li Zhong, Guanghai Li
In this article Ca1-x TiO3 :xEu3+ single crystalline particles with a cubic morphology and average size of 248 to 815 nm were synthesized by a solvothermal method. The structural and optical properties of the Ca1-x TiO3 :xEu3+ cubes were investigated, the formation mechanism of the cubes were analyzed and discussed, and the influence of Eu doping content and cubic size on the photoluminescence were examined. The differences in the photoluminescence between Ca1-x TiO3 :xEu3+ cubic crystals and nanoparticles was analyzed...
January 17, 2018: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29341331/the-relationship-between-thalamic-gaba-content-and-resting-cortical-rhythm-in-neuropathic-pain
#14
Flavia Di Pietro, Paul M Macey, Caroline D Rae, Zeynab Alshelh, Vaughan G Macefield, E Russell Vickers, Luke A Henderson
Recurrent thalamocortical connections are integral to the generation of brain rhythms and it is thought that the inhibitory action of the thalamic reticular nucleus is critical in setting these rhythms. Our work and others' has suggested that chronic pain that develops following nerve injury, that is, neuropathic pain, results from altered thalamocortical rhythm, although whether this dysrhythmia is associated with thalamic inhibitory function remains unknown. In this investigation, we used electroencephalography and magnetic resonance spectroscopy to investigate cortical power and thalamic GABAergic concentration in 20 patients with neuropathic pain and 20 pain-free controls...
January 17, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29340992/prospective-comparative-study-of-laparoscopic-narrow-band-imaging-nbi-versus-standard-imaging-in-gynecologic-oncology
#15
Alessia Aloisi, Yukio Sonoda, Ginger J Gardner, Kay J Park, Sarah L Elliott, Qin C Zhou, Alexia Iasonos, Nadeem R Abu-Rustum
BACKGROUND: Narrow band imaging (NBI) is an optic filtration enhancement for endoscopy that uses two wavelengths of light (415 and 540 nm) to highlight superficial microvascular patterns. It has been successfully utilized to improve identification of lesions with abnormal vasculature, which is associated with endometriosis and endometrial cancer. Case studies suggest it may also facilitate surgical staging of gynecologic cancer, which is critical in determining appropriate adjuvant therapies...
January 16, 2018: Annals of Surgical Oncology
https://www.readbyqxmd.com/read/29339948/update-on-functional-heartburn
#16
Takahisa Yamasaki, Jessica O'Neil, Ronnie Fass
The definition of functional heartburn has been refined over the years. It is currently described, based upon Rome IV criteria, as typical heartburn symptoms in the presence of normal upper endoscopy findings (including normal biopsies), normal esophageal pH testing, and a negative association between symptoms and reflux events. Functional heartburn is very common, affecting women more than men, and with reflux hypersensitivity makes up the majority of heartburn patients who fail twice-daily proton pump inhibitor therapy...
December 2017: Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/29339788/band-gap-maps-beyond-the-delocalization-limit-correlation-between-optical-band-gaps-and-plasmon-energies-at-the-nanoscale
#17
Wei Zhan, Vishnukanthan Venkatachalapathy, Thomas Aarholt, Andrej Yu Kuznetsov, Øystein Prytz
Recent progresses in nanoscale semiconductor technology have heightened the need for measurements of band gaps with high spatial resolution. Band gap mapping can be performed through a combination of probe-corrected scanning transmission electron microscopy (STEM) and monochromated electron energy-loss spectroscopy (EELS), but are rare owing to the complexity of the experiments and the data analysis. Furthermore, although this method is far superior in terms of spatial resolution to any other techniques, it is still fundamentally resolution-limited due to inelastic delocalization of the EELS signal...
January 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29339475/electron-mean-free-path-filtering-in-dirac-material-for-improved-thermoelectric-performance
#18
Te-Huan Liu, Jiawei Zhou, Mingda Li, Zhiwei Ding, Qichen Song, Bolin Liao, Liang Fu, Gang Chen
Recent advancements in thermoelectric materials have largely benefited from various approaches, including band engineering and defect optimization, among which the nanostructuring technique presents a promising way to improve the thermoelectric figure of merit (zT) by means of reducing the characteristic length of the nanostructure, which relies on the belief that phonons' mean free paths (MFPs) are typically much longer than electrons'. Pushing the nanostructure sizes down to the length scale dictated by electron MFPs, however, has hitherto been overlooked as it inevitably sacrifices electrical conduction...
January 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29338724/development-and-validation-of-hptlc-fingerprints-of-three-species-of-alpinia-with-biomarker-galangin
#19
Anuradha S Upadhye, Anagha Rajopadhye, Lourelle Dias
BACKGROUND: Alpinia galanga (L.) Willd. commonly called as Rasna, Greater galangal or Kulinjan is a medicinally important rhizome used in Indian traditional system of medicine to cure a number of ailments. A. galanga is the main source of a galangin -a medicinally important flavanol which has a number of pharmacological properties viz. anti-mutagenic, and anti-inflammatory. Due to the high demand for the rhizome of A. galanga traders are now substituting it with rhizomes of A. calcarata and A...
January 16, 2018: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/29338152/generation-and-characterization-of-siglec-f-specific-monoclonal-antibodies
#20
Sima Shahmohammadi-Farid, Roya Ghods, Mahmood Jeddi-Tehrani, Ali-Ahmad Bayat, Nazanin Mojtabavi, Alireza Razavi, Amir-Hassan Zarnani
Siglec-F (SF) is a surface glycoprotein expressed by mouse eosinophils and induces caspase- and mitochondria-dependent apoptosis after engagement with its cognate ligand or specific antibodies. This targeting eosinophils by monoclonal antibodies may help diverse diseases associated with increased frequency of eosinophils including allergy and asthma. In this paper, production of murine and rat monoclonal antibodies (mAbs) against Siglec-F has been addressed. Balb/c mice were immunized with siglec-F1 (SF1) and siglec-F2 (SF2) synthetic peptides conjugated to a carrier protein...
December 2017: Iranian Journal of Allergy, Asthma, and Immunology
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