4,294 results match your criteria studies harmonic


Elliptic Flow of Electrons from Beauty-Hadron Decays in Pb-Pb Collisions at sqrt[s_{NN}]=5.02  TeV.

Phys Rev Lett 2021 Apr;126(16):162001

Central China Normal University, Wuhan, China.

The elliptic flow of electrons from beauty hadron decays at midrapidity (|y|<0.8) is measured in Pb-Pb collisions at sqrt[s_{NN}]=5.02  TeV with the ALICE detector at the LHC. Read More

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Nonlinear dynamics of topological Dirac fermions in 2D spin-orbit coupled materials.

Sci Rep 2021 May 6;11(1):9734. Epub 2021 May 6.

Theoretical Division, Los Alamos National Laboratory, MS B262, Los Alamos, NM, 87545, USA.

The graphene family materials are two-dimensional staggered monolayers with a gapped energy band structure due to intrinsic spin-orbit coupling. The mass gaps in these materials can be manipulated on-demand via biasing with a static electric field, an off-resonance circularly polarized laser, or an exchange interaction field, allowing the monolayer to be driven through a multitude of topological phase transitions. We investigate the dynamics of spin-orbit coupled graphene family materials to unveil topological phase transition fingerprints embedded in the nonlinear regime and show how these signatures manifest in the nonlinear Kerr effect and in third-harmonic generation processes. Read More

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High-Order Wave-Damage Interaction Coefficients (WDIC) Extracted through Modal Decomposition.

Sensors (Basel) 2021 Apr 13;21(8). Epub 2021 Apr 13.

Department of Mechanical Engineering, University of South Carolina, 300 Main Street, Columbia, SC 29208, USA.

This paper presents a new technique for the extraction of high-order wave-damage interaction coefficients (WDIC) through modal decomposition. The frequency and direction dependent complex-valued WDIC are used to model the scattering and mode conversion phenomena of guided wave interaction with damage. These coefficients are extracted from the harmonic analysis of local finite element model (FEM) mesh with non-reflective boundaries (NRB) and they are capable of describing the amplitude and phase of the scattered waves as a function of frequency and direction. Read More

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Optical Voltage Transformer Based on FBG-PZT for Power Quality Measurement.

Sensors (Basel) 2021 Apr 12;21(8). Epub 2021 Apr 12.

Photonics and Instrumentation Laboratory, Electrical Engineering Program, COPPE-Universidade Federal do Rio de Janeiro, Rio de Janeiro 21949-598, Brazil.

Optical Current Transformers (OCTs) and Optical Voltage Transformers (OVTs) are an alternative to the conventional transformers for protection and metering purposes with a much smaller footprint and weight. Their advantages were widely discussed in scientific and technical literature and commercial applications based on the well-known Faraday and Pockels effect. However, the literature is still scarce in studies evaluating the use of optical transformers for power quality purposes, an important issue of power system designed to analyze the various phenomena that cause power quality disturbances. Read More

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Individual Differences in the Vocal Communication of Malayan Tapirs () Considering Familiarity and Relatedness.

Animals (Basel) 2021 Apr 5;11(4). Epub 2021 Apr 5.

Cognitive Ethology Laboratory, German Primate Center, Kellnerweg 4, 37077 Göttingen, Germany.

Studies in animal communication have shown that many species have individual distinct calls. These individual distinct vocalizations can play an important role in animal communication because they can carry important information about the age, sex, personality, or social role of the signaler. Although we have good knowledge regarding the importance of individual vocalization in social living mammals, it is less clear to what extent solitary living mammals possess individual distinct vocalizations. Read More

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A Novel Method for Estimating and Balancing the Second Harmonic Error of Cylindrical Fused Silica Resonators.

Micromachines (Basel) 2021 Apr 1;12(4). Epub 2021 Apr 1.

College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China.

The cylindrical resonator gyroscope (CRG) is a type of Coriolis vibratory gyroscope which measures the angular velocity or angle through the precession of the elastic wave of the cylindrical resonator. The cylindrical fused silica resonator is an essential component of the CRG, the symmetry of which determines the bias drift and vibration stability of the gyroscope. The manufacturing errors breaking the symmetry of the resonator are usually described by Fourier series, and most studies are only focusing on analyzing and reducing the fourth harmonic error, the main error source of bias drift. Read More

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A Phase I Clinical Trial to Assess Safety and Tolerability of Injectable Collagenase in Women with Symptomatic Uterine Fibroids.

Reprod Sci 2021 Apr 29. Epub 2021 Apr 29.

Department of Gynecology and Obstetrics, Division of Reproductive Sciences & Women's Health Research, Johns Hopkins University School of Medicine, 720 Rutland Avenue, Ross Research Building, Room 624, Baltimore, MD, 21205, USA.

Uterine fibroids feature excessive deposition of types I and III collagen. Previous ex vivo studies showed an FDA-approved collagenase (EN3835)-digested types I and III collagen fibers in fibroid tissues; however, collagenase had not been evaluated in vivo for effects on uterine fibroids. The objective was to assess the safety and tolerability of collagenase injection directly into uterine fibroids. Read More

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First chiral fluorinated lead vanadate selenite Pb(VOF)(VO)(SeO) with five asymmetric motifs and large optical properties.

Dalton Trans 2021 Apr 29. Epub 2021 Apr 29.

China-Australia Joint Research Center for Functional Molecular Materials, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China.

The first fluorinated lead vanadate selenite Pb2(V2O4F)(VO2)(SeO3)3 (PVOFS) was successfully synthesized via a mild hydrothermal method. This compound crystallizes in the chiral space group P212121 of the orthorhombic system and it is the first noncentrosymmetric structure in the PbII-VV-SeIV-O-F system. PVOFS is composed of five kinds of second-order Jahn-Teller susceptible asymmetric motifs, including three distinct types of vanadium-centered polyhedral units ([VO5F], [VO6] and [VO5]), [SeO3] pyramids and Pb2+ cations. Read More

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The effects of a simple optical clearing protocol on the mechanics of collagenous soft tissue.

J Biomech 2021 Apr 5;122:110413. Epub 2021 Apr 5.

Department of Biomedical Engineering, University of Texas at Austin, Austin, TX, United States; Department of Aerospace Engineering & Engineering Mechanics, University of Texas at Austin, Austin, TX, United States; Oden Institute for Computational Engineering and Sciences, University of Texas at Austin, Austin, TX, United States. Electronic address:

Optical clearing of biological tissues improves imaging depth for light transmission imaging modalities such as two-photon microscopy. In studies that investigate the interplay between microstructure and tissue-level mechanics, mechanical testing of cleared tissue may be useful. However, the effects of optical clearing on soft tissue mechanics have not been investigated. Read More

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Noise Suppression for Ultrasound Attenuation Coefficient Estimation based on Spectrum Normalization.

IEEE Trans Ultrason Ferroelectr Freq Control 2021 Apr 20;PP. Epub 2021 Apr 20.

Ultrasound attenuation coefficient estimation (ACE) has great diagnostic potential for fatty liver detection and assessment. In a previous study, we proposed a reference-phantom-free ACE method, called reference frequency method (RFM), which does not require a calibrated phantom for normalization. The power of each frequency component can be normalized by the power of an adjacent frequency component in the spectrum to cancel system-dependent effects such as focusing and time gain compensation (TGC). Read More

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Spiers Memorial Lecture: Introduction to ultrafast spectroscopy and imaging of photochemical reactions.

Authors:
Toshinori Suzuki

Faraday Discuss 2021 Apr 20. Epub 2021 Apr 20.

Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.

A brief overview is presented on ultrafast spectroscopy and imaging of photochemical reactions by highlighting several experimental studies reported in the last five years. A particular focus is placed on new experiments performed using high-order harmonic generation, X-ray free electron lasers, and relativistic electron beams. Exploration of fundamental chemical reaction dynamics using these advanced experimental methodologies is in an early stage, and exciting new research opportunities await in this rapidly expanding and advancing research field. Read More

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Quantum and semiclassical dynamical studies of nonadiabatic processes in solution: achievements and perspectives.

Phys Chem Chem Phys 2021 Apr 30;23(14):8181-8199. Epub 2021 Mar 30.

CNR-Consiglio Nazionale delle Ricerche, Istituto di Chimica dei Composti Organo Metallici (ICCOM-CNR), SS di Pisa, Area della Ricerca, via G. Moruzzi 1, I-56124 Pisa, Italy.

We concisely review the main methodological approaches to model nonadiabatic dynamics in isotropic solutions and their applications. Three general classes of models are identified as the most used to include solvent effects in the simulations. The first model describes the solvent as a set of harmonic collective modes coupled to the solute degrees of freedom, and the second as a continuum, while the third explicitly includes solvent molecules in the calculations. Read More

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High-Harmonic Generation and Spin-Orbit Interaction of Light in a Relativistic Oscillating Window.

Authors:
Longqing Yi

Phys Rev Lett 2021 Apr;126(13):134801

Department of Physics, Chalmers University of Technology, 41296 Gothenburg, Sweden.

When a high power laser beam irradiates a small aperture on a solid foil target, the strong laser field drives surface plasma oscillation at the periphery of this aperture, which acts as a "relativistic oscillating window." The diffracted light that travels though such an aperture contains high-harmonics of the fundamental laser frequency. When the driving laser beam is circularly polarized, the high-harmonic generation (HHG) process facilitates a conversion of the spin angular momentum of the fundamental light into the intrinsic orbital angular momentum of the harmonics. Read More

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Genetically related singers-acoustic feature analysis and impact on singer identification.

J Appl Genet 2021 Apr 15. Epub 2021 Apr 15.

Walchand College of Engineering, Sangli, India.

Studies relating music with genetics have been one of the fascinating fields of research. In this study, we have attempted to answer the most curious question-how acoustically close are the genetically related singers? The present study has investigated this perception using two genetically different relations-three female sibling singers and father-son singer relation. These are famous Indian playback singers and the acoustic features are extracted using the songs of Bollywood films. Read More

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Harmonics, evolutionary generators, DANCE, and HEAR-functional dimensions.

Environ Sci Pollut Res Int 2021 Apr 12. Epub 2021 Apr 12.

Control and Systems Engineering Department, University of Technology, Alsinaah Street, P.O. Box: 19006, Baghdad, 10066, Iraq.

Evolution of the major kingdoms of life has spanned over the last 4 billion years on Earth. Studies of the process comprise different fields of study with alternative perspectives. This paper focuses on mathematic unification of the subject area; enriching an engineering based structure to advance our understanding of pathways which lead to distinct constructs in life, furthering geographic bordering processes with biological context. Read More

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Synthesis, crystal growth, characterization and DFT investigation of a nonlinear optically active cuminaldehyde derivative hydrazone.

Acta Crystallogr B Struct Sci Cryst Eng Mater 2021 Apr 17;77(Pt 2):249-259. Epub 2021 Mar 17.

School of Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013, People's Republic of China.

Single crystals of (E)-N'-(4-isopropylbenzylidene)isonicotinohydrazide monohydrate (IBIHM) were grown from ethanol by the slow evaporation from solution growth technique at room temperature. The structure was elucidated by single-crystal X-ray diffraction analysis and crystallized in the orthorhombic system with noncentrosymmetric space group P222. Optical studies reveal that the absorption was minimum in the visible region and the band-gap energy was estimated using the Kubelka-Munk algorithm. Read More

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First-Principles Study on Electronic, Magnetic, Optical, Mechanical, and Thermodynamic Properties of Semiconducting Gadolinium Phosphide in GGA, GGA+U, mBJ, GGA+SOC and GGA+SOC+U approaches.

J Supercond Nov Magn 2021 Apr 4:1-16. Epub 2021 Apr 4.

Center for Advanced Studies in Physics (CASP), GC University, Lahore, 54000 Pakistan.

In the current article, the electronic, magnetic, and optical properties of GdP in the hypothetical zinc blende structure have been discussed by using GGA, GGA+U, mBJ, GGA+SOC, and GGA+SOC+U approaches. The energy vs volume plots in the three magnetic states suggest the ferromagnetic phase to be the stable phase of GdP. The cohesive energy calculated for GdP is negative, suggesting the stability of the compound. Read More

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Longitudinal Flow Decorrelations in Xe+Xe Collisions at sqrt[s_{NN}]=5.44  TeV with the ATLAS Detector.

Phys Rev Lett 2021 Mar;126(12):122301

Department of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, Romania.

The first measurement of longitudinal decorrelations of harmonic flow amplitudes v_{n} for n=2-4 in Xe+Xe collisions at sqrt[s_{NN}]=5.44  TeV is obtained using 3  μb^{-1} of data with the ATLAS detector at the LHC. The decorrelation signal for v_{3} and v_{4} is found to be nearly independent of collision centrality and transverse momentum (p_{T}) requirements on final-state particles, but for v_{2} a strong centrality and p_{T} dependence is seen. Read More

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Spin-Orbit Torque Switching of a High-Quality Perpendicularly Magnetized Ferrimagnetic Heusler MnGe Film.

ACS Appl Mater Interfaces 2021 Apr 6;13(15):18294-18300. Epub 2021 Apr 6.

Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.

Current-induced spin-orbit torque (SOT) switching of magnetization has attracted great interest due to its potential application in magnetic memory devices, which offer low-energy consumption and high-speed writing. However, most of the SOT studies on perpendicularly magnetized anisotropy (PMA) magnets have been limited to heterostructures with interfacial PMA and poor thermal stability. Here, we experimentally demonstrate a SOT magnetization switching for a ferrimagnetic D0-MnGe film with high bulk PMA and robust thermal stability factor under a critical current density of 6. Read More

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Machine Learning-Based Multiparametric Magnetic Resonance Imaging Radiomics for Prediction of H3K27M Mutation in Midline Gliomas.

World Neurosurg 2021 Apr 2. Epub 2021 Apr 2.

Department of Radiology, University of Iowa Hospital and Clinics, Iowa City, Iowa, USA.

Objective: H3K27M mutation in gliomas has prognostic implications. Previous magnetic resonance imaging (MRI) studies have reported variable rates of tumoral enhancement, necrotic changes, and peritumoral edema in H3K27M-mutant gliomas, with no distinguishing imaging features compared with wild-type gliomas. We aimed to construct an MRI machine learning (ML)-based radiomic model to predict H3K27M mutation in midline gliomas. Read More

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Detection of Genetic Overlap Between Rheumatoid Arthritis and Systemic Lupus Erythematosus Using GWAS Summary Statistics.

Front Genet 2021 18;12:656545. Epub 2021 Mar 18.

Department of Epidemiology and Biostatistics, School of Public Health, Xuzhou Medical University, Xuzhou, China.

Background: Clinical and epidemiological studies have suggested systemic lupus erythematosus (SLE) and rheumatoid arthritis (RA) are comorbidities and common genetic etiologies can partly explain such coexistence. However, shared genetic determinations underlying the two diseases remain largely unknown.

Methods: Our analysis relied on summary statistics available from genome-wide association studies of SLE ( = 23,210) and RA ( = 58,284). Read More

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Acoustic Properties of Axial and Centrifugal Flow Left Ventricular Assist Devices and Prediction of Pump Thrombosis.

Mayo Clin Proc 2021 04;96(4):887-900

Department of Cardiac Surgery, Mayo Clinic, Rochester, MN.

Objective: To characterize the properties of the audible tones produced by current left ventricular assist device (LVAD) pumps approved for use, and to ascertain if changes in those may be present in the setting of pump thrombosis.

Patients And Methods: From August 31, 2016, to January 16, 2020, LVAD recipients consented to have surface recordings obtained using a high-fidelity digital stethoscope. Audio data were analyzed using digital recording and editing software to produce an acoustic spectrogram by Fast Fourier transformation. Read More

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Modeling of Nonlinear Optical Phenomena in Host-Guest Systems Using Bond Fluctuation Monte Carlo Model: A Review.

Materials (Basel) 2021 Mar 16;14(6). Epub 2021 Mar 16.

Department of Theoretical Physics, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland.

We review the results of Monte Carlo studies of chosen nonlinear optical effects in host-guest systems, using methods based on the bond-fluctuation model (BFM) for a polymer matrix. In particular, we simulate the inscription of various types of diffraction gratings in degenerate two wave mixing (DTWM) experiments (surface relief gratings (SRG), gratings in polymers doped with azo-dye molecules and gratings in biopolymers), poling effects (electric field poling of dipolar molecules and all-optical poling) and photomechanical effect. All these processes are characterized in terms of parameters measured in experiments, such as diffraction efficiency, nonlinear susceptibilities, density profiles or loading parameters. Read More

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New Solids in As-O-Mo, As(P)-O-Mo(W) and As(P)-O-Nb(W) Systems That Exhibit Nonlinear Optical Properties.

Molecules 2021 Mar 9;26(5). Epub 2021 Mar 9.

Organisch-Chemisches Institut der Universität Heidelberg Lehrstuhl für Organische Chemie III 6 Im Neuenheimer Feld 270, Heidelberg University, D-69120 Heidelberg, Germany.

Interactions between well-mixed fine powders of AsO, PO, MoO, WO and NbO at different stoichiometry in quartz ampoules under vacuum at ~1000 °C in the presence of metallic molybdenum (or niobium), over several weeks, led to shiny dichroic crystalline materials being formed in cooler parts of the reaction vessel. An addition of small quantities of metals-Mo or Nb-was made with the aim of partially reducing their highly oxidized Mo(VI), W(VI) or Nb(V) species to corresponding Mo(V), W(V) and Nb(IV) centers, in order to form mixed valence solids. Sublimed crystals of four new compounds were investigated using a variety of techniques, with prime emphasis on the X-ray analysis, followed by spectroscopy (diffusion reflectance, IR, Raman and EPR), second harmonic generation (SHG), thermal analysis under N and air atmosphere, and single crystals electrical conductivity studies. Read More

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Short-Term Impact of AC Harmonics on Aging of NiMH Batteries for Grid Storage Applications.

Materials (Basel) 2021 Mar 6;14(5). Epub 2021 Mar 6.

Department of Chemical Engineering, Division of Applied Electrochemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.

Batteries in energy storage systems are exposed to electrical noise, such as alternating current (AC) harmonics. While there have been many studies investigating whether Lithium-ion batteries are affected by AC harmonics, such studies on Nickel Metal Hydride (NiMH) batteries are scarce. In this study a 10 Ah, 12 V NiMH battery was tested with three different harmonic current frequency overlays during a single charge/discharge cycle: 50 Hz, 100 Hz, and 1000 Hz. Read More

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Human serum albumin gradient in serous ovarian cancer cryosections measured by fluorescence lifetime.

Biomed Opt Express 2021 Mar 2;12(3):1195-1204. Epub 2021 Feb 2.

Key Laboratory of Optoelectronic Devices and Systems of Guangdong Province & Ministry of Education, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong Province 518060, China.

Human serum albumin (HSA) is a depot and carrier for many endogenous and exogenous molecules in blood. Many studies have demonstrated that the transport of HSA in tumor microenvironments contributes to tumor development and progression. In this report, we set up a multimodal nonlinear optical microscope system, combining two-photon excitation fluorescence, second harmonic generation, and two-photon fluorescence lifetime imaging microscopy. Read More

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Quantifying Breast Cancer-Driven Fiber Alignment and Collagen Deposition in Primary Human Breast Tissue.

Front Bioeng Biotechnol 2021 15;9:618448. Epub 2021 Mar 15.

Department of Surgery, Louisiana State University Health Sciences Center New Orleans, New Orleans, LA, United States.

Solid tumor progression is significantly influenced by interactions between cancer cells and the surrounding extracellular matrix (ECM). Specifically, the cancer cell-driven changes to ECM fiber alignment and collagen deposition impact tumor growth and metastasis. Current methods of quantifying these processes are incomplete, require simple or artificial matrixes, rely on uncommon imaging techniques, preclude the use of biological and technical replicates, require destruction of the tissue, or are prone to segmentation errors. Read More

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Investigations of Dianhydro-D-glucitol adsorbed on AuNPs surface: In silico and in vitro approach based on anticancer activity studies against A549 lung cancer cell lines.

J Mol Recognit 2021 Mar 30:e2899. Epub 2021 Mar 30.

Centre for Advanced Functional Materials, Department of Physics, Bishop Moore College, Mavelikara, India.

The adsorption behavior of a lung cancer agent, Dianhydro-D-glucitol (DIS) on gold nanoparticles (AuNPs) was studied using surface-enhanced Raman scattering techniques. The stabilized geometry, inter- and intra-molecular hydrogen bond, and harmonic vibrational wavenumbers of DIS and DIS adsorbed on AuNPs (DISA) surface have been investigated with the help of the density functional theory (DFT) method. The stability of the molecules arising from stereoelectronic interactions, leading to its bioactivity, has been confirmed using natural bond orbital (NBO) analysis, which was further substantiated by the narrow HOMO LUMO energy gap obtained for DISA, from frontier molecular orbital analysis as well as electronic spectral analysis. Read More

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Normative Speech Data in Professional Opera Singers- A Retrospective Study.

J Voice 2021 Mar 26. Epub 2021 Mar 26.

Department of Otolaryngology - Head and Neck Surgery, Senior Associate Dean for Clinical Academic Specialties, Drexel University College of Medicine, Philadelphia, PA, United States, Director of Otolaryngology and Communication Sciences Research, Lankenau Institute for Medical Research, Wynnewood, PA, US. Electronic address:

The term "singer" refers to a population of individuals who perform musical songs or related artistic material using their voices. Research has indicated that, as a population, singers' voice parameters differ from the non-singer population. Given the fact that diagnosed voice pathologies are more prevalent in the singer population, normative speech data in singers are necessary for diagnosis and for outcome analysis. Read More

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Evaluating Human-Computer Co-creative Processes in Music: A Case Study on the CHAMELEON Melodic Harmonizer.

Front Psychol 2021 22;12:603752. Epub 2021 Feb 22.

School of Music Studies, Aristotle University of Thessaloniki, Thessaloniki, Greece.

CHAMELEON is a computational melodic harmonization assistant. It can harmonize a given melody according to a number of independent harmonic idioms or blends between idioms based on principles of conceptual blending theory. Thus, the system is capable of offering a wealth of possible solutions and viewpoints for melodic harmonization. Read More

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February 2021