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https://www.readbyqxmd.com/read/28550413/glottal-gap-tracking-by-a-continuous-background-modeling-using-inpainting
#1
Gustavo Andrade-Miranda, Juan Ignacio Godino-Llorente
The visual examination of the vibration patterns of the vocal folds is an essential method to understand the phonation process and diagnose voice disorders. However, a detailed analysis of the phonation based on this technique requires a manual or a semi-automatic segmentation of the glottal area, which is difficult and time consuming. The present work presents a cuasi-automatic framework to accurately segment the glottal area introducing several techniques not explored before in the state of the art. The method takes advantage of the possibility of a minimal user intervention for those cases where the automatic computation fails...
May 27, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28548088/direct-observation-of-coherent-energy-transfer-in-nonlinear-micromechanical-oscillators
#2
Changyao Chen, Damián H Zanette, David A Czaplewski, Steven Shaw, Daniel López
Energy dissipation is an unavoidable phenomenon of physical systems that are directly coupled to an external environmental bath. In an oscillatory system, it leads to the decay of the oscillation amplitude. In situations where stable oscillations are required, the energy dissipated by the vibrations is usually compensated by replenishment from external energy sources. Consequently, if the external energy supply is removed, the amplitude of oscillations start to decay immediately, since there is no means to restitute the energy dissipated...
May 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28548085/ultrafast-coherence-transfer-in-dna-templated-silver-nanoclusters
#3
Erling Thyrhaug, Sidsel Ammitzbøll Bogh, Miguel R Carro-Temboury, Charlotte Stahl Madsen, Tom Vosch, Donatas Zigmantas
DNA-templated silver nanoclusters of a few tens of atoms or less have come into prominence over the last several years due to very strong absorption and efficient emission. Applications in microscopy and sensing have already been realized, however little is known about the excited-state structure and dynamics in these clusters. Here we report on a multidimensional spectroscopy investigation of the energy-level structure and the early-time relaxation cascade, which eventually results in the population of an emitting state...
May 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28546892/nanoantenna-assisted-plasmonic-enhancement-of-ir-absorption-of-vibrational-modes-of-organic-molecules
#4
Alexander G Milekhin, Olga Cherkasova, Sergei A Kuznetsov, Ilya A Milekhin, Ekatherina E Rodyakina, Alexander V Latyshev, Sreetama Banerjee, Georgeta Salvan, Dietrich R T Zahn
Nanoantenna-assisted plasmonic enhancement of IR absorption and Raman scattering was employed for studying the vibrational modes in organic molecules. Ultrathin cobalt phthalocyanine films (3 nm) were deposited on Au nanoantenna arrays with specified structural parameters. The deposited organic films reveal the enhancement of both Raman scattering and IR absorption vibrational modes. To extend the possibility of implementing surface-enhanced infrared absorption (SEIRA) for biological applications, the detection and analysis of the steroid hormone cortisol was demonstrated...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28546342/intrinsic-frequency-response-patterns-in-mechano-sensory-neurons-of-the-leech
#5
Linda Fischer, Frank Scherbarth, Boris Chagnaud, Felix Felmy
Animals employ mechano-sensory systems to detect and explore their environment. Mechano-sensation encompasses stimuli like constant pressure, surface movement or vibrations at various intensities that need to be segregated in the central nervous system. Besides different receptor structures sensory filtering via intrinsic response properties could provide a convenient way to solve this problem. In leech, three major mechano-sensory cell types can be distinguished according to their stimulus sensitivity into nociceptive, pressure and touch cells...
May 25, 2017: Biology Open
https://www.readbyqxmd.com/read/28545245/multimodal-bio-inspired-tactile-sensing-module-for-surface-characterization
#6
Thiago Eustaquio Alves de Oliveira, Ana-Maria Cretu, Emil M Petriu
Robots are expected to recognize the properties of objects in order to handle them safely and efficiently in a variety of applications, such as health and elder care, manufacturing, or high-risk environments. This paper explores the issue of surface characterization by monitoring the signals acquired by a novel bio-inspired tactile probe in contact with ridged surfaces. The tactile module comprises a nine Degree of Freedom Microelectromechanical Magnetic, Angular Rate, and Gravity system (9-DOF MEMS MARG) and a deep MEMS pressure sensor embedded in a compliant structure that mimics the function and the organization of mechanoreceptors in human skin as well as the hardness of the human skin...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28545236/thermal-characterization-of-dynamic-silicon-cantilever-array-sensors-by-digital-holographic-microscopy
#7
Marjan Zakerin, Antonin Novak, Masaya Toda, Yves Emery, Filipe Natalio, Hans-Jürgen Butt, Rüdiger Berger
In this paper, we apply a digital holographic microscope (DHM) in conjunction with stroboscopic acquisition synchronization. Here, the temperature-dependent decrease of the first resonance frequency (S₁(T)) and Young's elastic modulus (E₁(T)) of silicon micromechanical cantilever sensors (MCSs) are measured. To perform these measurements, the MCSs are uniformly heated from T₀ = 298 K to T = 450 K while being externally actuated with a piezo-actuator in a certain frequency range close to their first resonance frequencies...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28544895/vibrational-spectroscopy-of-the-mass-selected-tetrahydrofurfuryl-alcohol-monomers-and-its-dimers-in-gas-phase-using-ir-depletion-and-vuv-single-photon-ionization
#8
Pengchao Wang, Yongjun Hu, Huaqi Zhan, Jiaxin Chen, Shan Jin, Wentao Song, Yujian Li
Tetrahydrofurfuryl alcohol (THFA, C5H10O2) is a close chemical analog of the sugar rings present in the phosphate-deoxyribose backbone structure of the nucleic acids. In present report, the infrared (IR) spectra of the size-selected THFA monomer and its dimer have been investigated in a pulsed supersonic jet using infrared-vacuum ultraviolet (VUV) ionization. Herein, the laser light at 118nm wavelength served as the source of "soft" ionization in a time-of-flight mass spectrometer. The IR features for the monomers located at 3622cm(-1) can be assigned to the intramolecular hydrogen bonding stretch vibrations mainly referring to A and C conformers...
May 1, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28542633/new-chamber-stapes-prosthesis-a-preliminary-assessment-of-the-functioning-of-the-prototype
#9
Monika Kwacz, Magdalena Sołyga, Maciej Mrówka, Konrad Kamieniecki
Piston-stapedotomy is the most common method for hearing restoration in patients with otosclerosis. In this study, we have experimentally examined a prototype of a new chamber stapes prosthesis. The prototype was implanted in a human cadaver temporal bone. The round window vibrations before and after implantation were measured for the acoustic signal (90 dB SPL, 0.8-8 kHz) in the external auditory canal. In comparison with a 0.4-mm piston prosthesis, the chamber prosthesis induced significantly higher vibration of the round window, especially for frequencies above 1...
2017: PloS One
https://www.readbyqxmd.com/read/28542287/the-relationship-between-occupational-noise-and-vibration-exposure-and-headache-eyestrain-based-on-the-fourth-korean-working-condition-survey-kwcs
#10
Jihyun Kim, Wanhyung Lee, Jong-Uk Won, Jin-Ha Yoon, Hongdeok Seok, Yeong-Kwang Kim, Seunghyun Lee, Jaehoon Roh
INTRODUCTION: The individual and combined effect of occupational noise and vibration exposures, on workers' health has not been thoroughly investigated. In order to find better ways to prevent and manage workers' headache, this study aimed to investigate the effects of occupational noise and vibration exposure on headache/eyestrain. METHODS: We used data from the fourth Korean Working Condition Survey (2014). After applying inclusion and exclusion criteria, 25,751 workers were included...
2017: PloS One
https://www.readbyqxmd.com/read/28541703/molecular-origin-of-the-vibrational-structure-of-ice-ih
#11
Daniel R Moberg, Shelby C Straight, Christopher Knight, Francesco Paesani
An unambiguous assignment of the vibrational spectra of ice Ih remains a matter of debate. This study demonstrates that an accurate representation of many-body interactions between water molecules, combined with an explicit treatment of nuclear quantum effects through many-body molecular dynamics (MB-MD), leads to a unified interpretation of the vibrational spectra of ice Ih in terms of the structure and dynamics of the underlying hydrogen-bond network. All features of the infrared and Raman spectra in the OH stretching region can be unambiguously assigned by taking into account both the symmetry and the delocalized nature of the lattice vibrations as well as the local electrostatic environment experienced by each water molecule within the crystal...
May 26, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28541350/ultrasensitive-and-reproducible-sers-platform-of-coupled-ag-grating-with-multibranched-au-nanoparticles
#12
Yevgeniya Kalachyova, David Mares, Vitezslav Jerabek, Pavel Ulbrich, Ladislav Lapcak, Vaclav Svorcik, Oleksiy Lyutakov
Surface-enhanced Raman scattering (SERS) spectroscopy is an extremely sensitive analytical technique that is capable of identifying the vibration signatures of target molecules up to single-molecule sensitivity. In this work, the ultrahigh sensitivity of SERS has been achieved through the immobilization of sharp-edges specific nanoparticles - so-called gold multibranched NPs (AuMs) on the silver grating surface through the biphenyl dithiol. This approach allows combining the extremely high SERS enhancement factor (better than that in the case of AuMs immobilized on the flat Ag film) with perfect reproducibility of Raman signals...
May 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28541151/morphological-evaluation-of-merkel-cells-and-small-lamellated-sensory-receptors-in-the-equine-foot
#13
Robert M Bowker, Lisa S Lancaster, Diane A Isbell
OBJECTIVE To examine the equine foot for the presence of sensory receptors including Merkel cells and small lamellated Pacinian-like corpuscles (SLPCs). SAMPLE Forefeet obtained from 7 horses following euthanasia for reasons other than foot disease. PROCEDURES Disarticulated feet were cut into either sagittal sections or cross sections and immersed in neutral-buffered 4% formalin. Following fixation, samples were obtained from the midline of the dorsal aspect of the hoof wall and from the frog (cuneus ungulae) between the apex and central sulcus...
June 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28541052/janus-particles-templated-by-janus-emulsions-and-application-as-pickering-emulsifier
#14
Duo Wei, Lingling Ge, Shuhui Lu, Jingjing Li, Rong Guo
One-step vibrational mixing has afforded batch-scale preparation of Janus emulsion. Fabrication of Janus particles (JPs) templated by the Janus emulsions was motivated as the topology and composition of the Janus droplets were highly tunable and controllable. Two immiscible polymerizable monomers were introduced as inner phases of Janus emulsion. The advanced geometry of the resultant JPs was easily and precisely controlled from "snowman" to "dumbbell" by adjusting the mass ratio of two oils in initial emulsion...
May 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28540819/a-remote-temperature-sensor-for-an-ultrasound-hyperthermia-system-using-the-acoustic-signal-derived-from-the-heating-signals
#15
Dibbyan Mazumder, Ram Mohan Vasu, Debasish Roy, Rajan Kanhirodan
We demonstrate a non-invasive technique, based on the modal frequency shift of a region insonified by a dual-beam ultrasound (US) transducer (region of interest, ROI), to remotely assess the temperature of the region in a tissue-mimicking object. The application is in ultrasound hyperthermia systems for controlled maintenance of tumour temperature during chemotherapy. Towards this, we have characterised the variation of the storage modulus with the temperature of two tissue-mimicking visco-elastic materials...
May 16, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28540461/quantitative-analysis-of-curcumin-loaded-alginate-nanocarriers-in-hydrogels-using-raman-and-attenuated-total-reflection-infrared-spectroscopy
#16
Lynda Miloudi, Franck Bonnier, Dominique Bertrand, Hugh J Byrne, Xavier Perse, Igor Chourpa, Emilie Munnier
Core-shell nanocarriers are increasingly being adapted in cosmetic and dermatological fields, aiming to provide an increased penetration of the active pharmaceutical or cosmetic ingredients (API and ACI) through the skin. In the final form, the nanocarriers (NC) are usually prepared in hydrogels, conferring desired viscous properties for topical application. Combined with the high chemical complexity of the encapsulating system itself, involving numerous ingredients to form a stable core and quantifying the NC and/or the encapsulated active without labor-intensive and destructive methods remains challenging...
May 25, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28540439/characterization-of-silver-nanoparticles-produced-by-biosynthesis-mediated-by-fusarium-oxysporum-under-different-processing-conditions
#17
Édipo S Almeida, Débora de Oliveira, Dachamir Hotza
The goal of this study was the biosynthesis of silver nanoparticles (SNPs) mediated by the fungus Fusarium oxysporum, as well as the characterization of these nanoparticles including evaluation of the particles size and stability under different processing conditions. The results showed that the biosynthesis produced silver nanoparticles having a mean size of 34 nm and zeta potential values below -30 mV at the conditions used, characterizing the nanoparticles as being stable in suspension. Ultraviolet-visible spectroscopy and flame atomic absorption spectroscopy confirmed the formation of silver nanoparticles and Fourier transform infrared spectroscopy detected the bands corresponding to the binding vibration of amide I and II bands of proteins in addition to the presence of cyclic alkanes, cyclohexane, ethers, and aromatic hydrocarbons...
May 24, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28538603/a-systematic-review-of-the-exercise-effect-on-bone-health-the-importance-of-assessing-mechanical-loading-in-perimenopausal-and-postmenopausal-women
#18
Borja Sañudo, Moisés de Hoyo, Jesús Del Pozo-Cruz, Luis Carrasco, Borja Del Pozo-Cruz, Sergio Tejero, Elwyn Firth
OBJECTIVE: The aims of this systematic review were to determine the general effects of exercise on areal bone mineral density (BMD) in perimenopausal and postmenopausal women, and to provide information on the most suitable bone-loading exercise regimens that may improve bone health in this population group. METHODS: A computerized, systematic literature search was performed in the electronic databases PubMed, Web of Science, CINAHL, SPORTDiscus, and The Cochrane Library, from January 2005 to November 2015, to identify all randomized controlled trials related to exercise in perimenopausal and postmenopausal women...
May 22, 2017: Menopause: the Journal of the North American Menopause Society
https://www.readbyqxmd.com/read/28538593/dynamic-response-of-the-lumbar-spine-to-whole-body-vibration-under-a-compressive-follower-preload
#19
Li-Xin Guo, Wei Fan
STUDY DESIGN: A finite element study of dynamic response of the lumbar spine to whole-body vibration. OBJECTIVE: To develop and validate a finite element model for exploring the impact of whole-body vibration on the entire lumbar spine with a compressive follower preload applied. SUMMARY OF BACKGROUND DATA: Several finite element studies have investigated the biodynamic characteristics of the human lumbar spine when exposed to whole-body vibration...
May 22, 2017: Spine
https://www.readbyqxmd.com/read/28538206/spectroscopic-far-or-terahertz-mid-infrared-and-raman-investigation-thermal-analysis-and-biological-activity-of-piplartine
#20
Anubha Srivastava, T Karthick, B D Joshi, Rashmi Mishra, Poonam Tandon, A P Ayala, Javier Ellena
Research in the field of medicinal plants including Piper species like long pepper (Piper longum L.- Piperaceae) is increasing all over the world due to its use in traditional and Ayurvedic medicine. Piplartine (piperlongumine, 5,6-dihydro-1-[(2E)-1-oxo-3-(3,4,5-trimethoxyphenyl)-2-propenyl]-2(1H)-pyridinone), a biologically active alkaloid/amide was isolated from the phytochemical investigations of Piper species, as long pepper. This alkaloid has cytotoxic, anti-fungal, anti-diabetic, anti-platelet aggregation, anti-tumoral, anxiolytic, anti-depressant, anti-leishmanial, and genotoxic activities, but, its anticancer property is the most promising and has been widely explored...
May 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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