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PubMed Journals Articles About "Researchers Shed Light Atomic Wave Function" RSS

21:41 EDT 25th June 2019 | BioPortfolio

Researchers Shed Light Atomic Wave Function PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Researchers Shed Light Atomic Wave Function articles that have been published worldwide.

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Showing "Researchers shed light atomic wave function" PubMed Articles 1–25 of 22,000+

Generation of Rb resonant bright two-mode squeezed light with four-wave mixing.

Squeezed states of light have found their way into a number of applications in quantum-enhanced metrology due to their reduced noise properties. In order to extend such an enhancement to metrology experiments based on atomic ensembles, an efficient light-atom interaction is required. Thus, there is a particular interest in generating narrow-band squeezed light that is on atomic resonance. This will make it possible not only to enhance the sensitivity of atomic based sensors, but also to deterministically tr...


Pathway-specific light adaptation in human electroretinograms.

The cellular origins of slow ERG changes during light adaptation following a dark-adapted state are still unclear. To study light adaptation, six healthy, normal trichromats were dark-adapted for 30 min prior to full-field ERG recordings to sinusoidal stimuli that isolate responses of the L- or M-cones or that stimulate luminance and chromatic mechanisms at 12 or 36 Hz. Recordings were performed for 16 min with 2-min intervals after onset of a constant background. Generally, the responses were sine-wave-lik...

Thalidomide Teratogenic Effects Linked to Degradation of SALL4: After 60 years, researchers have now shed light on the mechanism underlying thalidomide's devastating teratogenic effects.


Coherent microwave-to-optical conversion by three-wave mixing in a room temperature atomic system.

We experimentally observe coherent generation of a near-infrared optical field through a three-wave mixing phenomenon in an atomic energy level scheme of Rb85 atoms. This nonlinear generation process in a centro-symmetric thermally broadened atomic system is made possible through a novel interaction between induced electric and magnetic dipoles. The two-photon and three-photon coherence present in our scheme eliminates excited state decoherence. Thus, our scheme represents a minimal optical decoherence sche...

Enhancement of corneal epithelium cell survival, proliferation and migration by red light: Relevance to corneal wound healing.

The aim of the present study was to analyse how short wave blue and long wave red light differentially affect corneal epithelial (HCE-2) cells in culture. The corneal epithelium in situ is exposed to more blue light than in the past because of Light Emitting Diodes (LEDs) used for indoor lighting and computer, television and phone screens. Compared with cultures maintained in the dark, low intensity blue light, such as that emitted from computer screens, reduced the proliferation rate of HCE-2 cells and c...

Ray-wave duality in classical optics: crossing the Feynman bridge.

Classical ray and wave optics share a common structure with quantum mechanics. Much of this results from the representations given to abstract operators. It is possible to build a mathematical bridge that allows one to transform back and forth between the ray and wave picture. This is given by the Feynman path integral representation. The map between the ray and wave description is given in terms of a sum over histories integration. In particular, it allows for the computation of wave phenomena by the summa...

Optical Transmission of an Atomic Vapor in the Mesoscopic Regime.

By measuring the transmission of near-resonant light through an atomic vapor confined in a nanocell we demonstrate a mesoscopic optical response arising from the nonlocality induced by the motion of atoms with a phase coherence length larger than the cell thickness. Whereas conventional dispersion theory-where the local atomic response is simply convolved by the Maxwell-Boltzmann velocity distribution-is unable to reproduce the measured spectra, a model including a nonlocal, size-dependent susceptibility is...

Strategies for Minimizing Occupational Radiation Exposure in Cardiac Imaging.

Radiation safety has been at the center of interest of both researchers and healthcare institutions. This review will summarize and shed light on the various techniques adapted to reduce staff exposure to ionizing radiation (IR) in the field of cardiac imaging.

The difference between horizontal-to-vertical spectra ratio and empirical transfer function as revealed by vertical arrays.

The horizontal-to-vertical spectral ratio (HVSR) and empirical transfer function analyses were performed on the S-wave recordings from two vertical borehole strong motion arrays: the Garner Valley Downhole Array in southern California, and the KiK-net Ichinoseki-Nishi Vertical Array in West Ichinoseki, Japan. The results show that the discrepancy between the HVSR and the transfer function is mainly caused by the significant site response of the vertical component, thus, vertical incident P-waves are propose...

The role of immunity in the pathogenesis and development of preeclampsia.

Preeclampsia is a leading cause of maternal and perinatal morbidity and mortality, however, the aetiology of preeclampsia still remains unclear. It has been widely accepted that the disease results from insufficient spiral artery remodelling, leading to placental ischaemia and the release of a variety of factors. In recent decades, a large number of studies have observed an abnormal immune response in preeclamptic women and studies of both patients and animal models have shown alterations in the function or...

Quantum Optics of Spin Waves through ac Stark Modulation.

We bring the set of linear quantum operations, important for many fundamental studies in photonic systems, to the material domain of collective excitations known as spin waves. Using the ac Stark effect we realize quantum operations on single excitations and demonstrate a spin-wave analog of the Hong-Ou-Mandel effect, realized via a beam splitter implemented in the spin-wave domain. Our scheme equips atomic-ensemble-based quantum repeaters with quantum information processing capability and can be readily br...

Synchrotron radiation X-ray diffraction studies on muscle: past, present, and future.

X-ray diffraction is a technique to study the structure of materials at spatial resolutions up to an atomic scale. In the field of life science, the X-ray diffraction technique is especially suited to study materials having periodical structures, such as protein crystals, nucleic acids, and muscle. Among others, muscle is a dynamic structure and the molecular events occurring during muscle contraction have been the main interest among muscle researchers. In early days, the laboratory X-ray generators were u...

Availability of multistep light stimulus method for evaluation of visual dysfunctions.

In the field of drug safety research, electroretinography (ERG) is commonly conducted according to the international standard method propounded by the International Society for Clinical Electrophysiology of Vision (ISCEV) in recent years. However, various ERG methods other than the ISCEV standard method are also utilized depending on the intended purpose of the evaluation. In this study, we investigated the availability of a multistep light stimulus method for evaluation of rod function in Long-Evans rats u...

Coherent Control and Wave Mixing in an Ensemble of Silicon-Vacancy Centers in Diamond.

Strong light-matter interactions are critical for quantum technologies based on light, such as memories or nonlinear interactions. Solid state materials will be particularly important for such applications due to the relative ease of fabrication of components. Silicon vacancy centers (SiV^{-}) in diamond feature especially narrow inhomogeneous spectral lines, which are rare in solid materials. Here, we demonstrate resonant coherent manipulation, stimulated Raman adiabatic passage, and strong light-matter in...

Gain mechanism of femtosecond two-photon-excited lasing effect in atomic hydrogen.

By aiming to establish single-ended standoff combustion diagnostics, bidirectional lasing emissions of atomic hydrogen at 656 nm wavelength have been generated via two-photon resonant excitation by focusing 205 nm femtosecond laser pulses into a premixed CH/O flame. The forward lasing strength is approximately one order of magnitude stronger than that of the backward one, due to the geometry of traveling wave excitation over a 2-mm-long pencil-shaped gain volume and the short gain lifetime of 3.5 ps. The...

Impact of Pulmonary Endarterectomy on Pulmonary Arterial Wave Propagation and Reservoir Function.

High wave speed and large wave reflection in the pulmonary artery have previously been reported in patients with chronic thromboembolic pulmonary hypertension (CTEPH). We assessed the impact of pulmonary endarterectomy (PEA) on pulmonary arterial wave propagation and reservoir function in CTEPH patients. Right heart catheterization was performed using a combined pressure and Doppler flow sensor tipped guidewire to obtain simultaneous pressure and flow velocity measurements in the pulmonary artery in eight C...

Sparse non-orthogonal wave function expansions from the extension of the generalized Pauli constraints to the two-electron reduced density matrix.

Generalized Pauli constraints (GPCs) impose constraints in the form of inequalities on the natural orbital occupation numbers of the one electron reduced density matrix (1-RDM), defining the set of pure N-representable 1-RDMs, or 1-RDMs that can be derived from an N-electron wave function. Saturation of these constraints is termed "pinning" and implies a significant simplification of the N-electron wave function as the number of Slater determinants required to fully describe the system is reduced. Recent re...

Relationship between electrical conduction and phasic left atrial function: P-wave signal-averaged electrocardiography and time-left atrial volume curve assessments using two-dimensional speckle-tracking echocardiography.

P-wave signal-averaged electrocardiography (P-SAECG) can detect imperceptible conduction abnormalities, and volume analysis using two-dimensional speckle-tracking echocardiography (2-DSTE) allows us to easily measure the phasic function of the left atrium (LA). Both conduction abnormalities and functional deformation of the LA may be linked to the clinical outcome; however, the exact relationship is unclear. The aim of this study was to investigate the relationship between the phasic function of the LA and ...

The roles of circular RNAs in human development and diseases.

For many years, circular ribonucleic acids (circRNAs) have been counted as aberrant splicing by-products. Advanced bioinformatics analysis and deep sequencing techniques have allowed researchers to discover more interesting facts about circRNAs. Intriguing evidence has shed light on the functions of circRNAs in many tissues. Furthermore, emerging reports showed that circRNAs are found abundantly in saliva and blood samples, suggesting that circRNAs are potential clinical biomarkers for human embryonic devel...

Rising-frequency chirp stimulus to effectively enhance wave-I amplitude of auditory brainstem response.

This study aims to find an effective chirp signal that enhances the amplitude of wave-I of auditory brainstem response (ABR) to diagnose "cochlear synaptopathy." Although several chirp signals have been proposed to enhance the amplitude of wave-V, the effect on wave-I has not been clarified yet. Ten chirp signals, which have shorter group delays than the commonly used "CE-chirp," were produced to measure the amplitudes of wave-I and wave-V of the ABRs. The results show that one of the chirp signals signific...

Spike-Wave Discharges and Sleep-Wake States during Circadian Desynchronization: No Effects of Agomelatine upon Re-Entrainment.

Rapid changes in the light-dark cycle cause circadian desynchronization between rhythms of spike-wave discharges (SWDs) and motor activity in genetic epileptic rats, and this is accompanied by an increase in epileptic activity. Given the close relationship between absence seizures and sleep-wake states, the present study assessed firstly a putative relationship between vigilance rhythms and SWDs during re-synchronization, and secondly sleep-wake patterns responsible for increased epileptic activity. Lastly,...

Evaluating Density Functionals by Examining Molecular Structures, Chemical Bonding, and Relative Energies of Mononuclear Ru-Cl-H-PR Isomers.

In order to define a robust level of theory using density functionals for investigating the reactivity of ruthenium complexes, we used benchmark wave function theory, with saturated basis sets to validate GGA, meta-GGA, and hyper-GGA functionals in the presence and absence of empirical dispersion and range-separated corrections. We first selected potentially suitable functionals that gave accurate predictions of the relative energetics of coordination isomers. These functionals were further evaluated for th...

Photo Atomic Layer Etching of GaAs/AlGaAs Nanoheterostructures.

Photo atomic layer etching (photo-ALE) of GaAs and AlGaAs semiconductors was investigated in deionized H2O and aqueous solution of NH4OH under weak excitation conditions (P  20 mW/cm2). The process is based on digital photocorrosion in a processed solution and a negligible corrosion during the light-off phase employed for dissolution of the photocorrosion products. An inductively-coupled plasma mass spectroscopy (ICP-MS) analysis revealed that photo-ALE of GaAs in an aqueous solution of NH4OH proceeds li...

Investigation on formation process of metal atomic filament for metal sulfide atomic switch by electrical measurement.

We have studied the formation process of the metal atomic filament for the metal sulfide atomic switches by the electrical measurement. The switching between ON and OFF states of the atomic switch is controlled by the application of the bias voltage for the atomic switches. The SET (OFF→ON) and RESET (ON→OFF) voltages were investigated for the atomic switch where the Ag<sub>2</sub>S or Cu<sub>2</sub>S layer was sandwiched between the Pt and Ag or Cu electrodes. The SET and RESET ...

Scale-Invariant Continuous Entanglement Renormalization of a Chern Insulator.

The multiscale entanglement renormalization ansatz (MERA) postulates the existence of quantum circuits that renormalize entanglement in real space at different length scales. Chern insulators, however, cannot have scale-invariant discrete MERA circuits with a finite bond dimension. In this Letter, we show that the continuous MERA (cMERA), a modified version of MERA adapted for field theories, possesses a fixed point wave function with a nonzero Chern number. Additionally, it is well known that reversed MERA...


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