Cardiovascular studies indicated the importance of beat-to-beat regulation of heart rate via the aortic nerve, the importance of the pericardium in minimizing stresses, and following positive acceleration in unprotected subjects acute cardiopulmonary cong...

The beat wave accelerator1 depends on the generation of a large amplitude plasma wave with a phase velocity close to the velocity of light c. The plasma wave (?p,kp) is generated by beating colinear laser beams (?1,k1) and (?2,k2) with ?p=?1-?2, kp=k1-k2. Since the process involves both large amplitude transverse and longitudional ...

Selected examples of advanced accelerator concepts are reviewed. Such plasma accelerators as plasma beat wave accelerator, plasma wake field accelerator, and plasma grating accelerator are discussed particularly as examples of concepts for accelerating ...

Oxymatrine (OM), extracted from Sophora alopecuroides L, increased the contractility of the left heart atrium and decreased the spontaneous beating rate of right atrium of rabbit as described in our previous paper. The effect of OM on the beating rate of cultured rat myocardial cells was observed in the present ...

... grant. Page 8. Chapter 1 Ion Acceleration by Beating Electrostatic Waves: Domain of Allowed Acceleration 1.1 Introduction Stochastic ...

... Accession Number : ADA200399. Title : Relativistic Focusing and Beat Wave Phase Velocity Control in the Plasma Beat Wave Accelerator. ...

The highlights of the working group on plasma accelerators are presented, the three main topics are (i) the beat wave accelerators, (ii) other plasma accelerators, (iii) miscellaneous work on plasma accelerators. (AIP)

Several laser plasma accelerator schemes are reviewed, with emphasis on the Plasma Beat Wave Accelerator (PBWA). Theory indicates that a very high acceleration gradient, of order 1 GeV/m, can exist in the plasma wave driven by the beating lasers. Experime...

A ballistocardiograph records the mechanical activity of the heart. We present a novel algorithm for the detection of individual heart beats and beat-to-beat interval lengths in ballistocardiograms (BCGs) from healthy subjects. An automatic training step based on unsupervised learning techniques is used to extract the shape of a single heart ...

Cardiovascular variables such as heart rate, arterial blood pressure, stroke volume and the shape of

... Accession Number : ADA214288. Title : Optical Guiding by Plasma Waves in the Plasma Beat Wave Accelerator. Descriptive ...

... Title : HEART RATE PATTERNS OBSERVED IN MEDICAL MONITORING. ... Automated beat-by-beat heart rate analysis recorded at 1 mm. ...

Electrocardiograms were recorded during 45-sec. exposures to +6.5 to +9.0 Gz of 14 human subjects on the USAF School of Aerospace Medicine human centrifuge. Maximum heart rate (HR) reached by each subject ranged from 155 to 205 beats/min. Four subjects de...

on WWW 10 May 2000 #12;1756 the body and wings as the bird flies in the wind tunnel and then to apply Newton the acceleration that occurs within each wing beat, but not the slow changes as the bird wanders up and down wings. An experimental approach to this will require a bird that flies sufficiently steadily

A summary is given of the activities of those in the Media Accelerator Group. Attention was focused on the Inverse Cherenkov Accelerator, the Laser Focus Accelerator, and the Beat Wave Accelerator. For each of these the ultimate capability of the concept was examined as well as the next series ...

A preliminary analytic study of the temporal evolution of the beat wave accelerator (BWA) has been conducted. It was found that while energy cascading is crucial to the interpretation of current simulations, it will be less important in an actual device where the existing simple fluid model will be adequate.

Particle motion in a laser beat-wave plasma field with a transverse magnetic field is explored. It is determined that stable, phase-space buckets for acceleration are established by these fields and that particles injected near the beat-wave phase velocit...

A review is given of energy cascading in the beat-wave accelerator. The properties of the electromagnetic cascade and the corresponding plasma-wave evolution are well understood within the framework of an approximate analytic model. Based on this model, i...

We present an investigation on heart cycle time series, using inverse statistical analysis, a concept borrowed from studying turbulence. Using this approach, we studied the distribution of the exit times needed to achieve a predefined level of heart rate alteration. Such analysis uncovers the most likely waiting time needed to reach a certain change in the ...

Fetal heart rate complexity was examined on the basis of RR interval time series obtained in the second and third trimester of pregnancy. In each fetal RR interval time series, short term beat-to-beat heart rate changes were coded in 8 bit binary sequences. Redundancies of the 28 different binary patterns were reduced by two different ...

Described are two mechanisms which make it possible for an accelerated charged particle to stay in phase indefinitely with a moving accelerating potential well set up by electromagnetic radiation in a plasma beat-wave accelerator. The first is a double beat-wave mechanism, in which interference ...

Two mechanisms are described by which the phase matching between accelerated particle and accelerating plasma wave in a plasma beat-wave accelerator can be maintained indefinitely. (1) Interference between two beat-waves to cancel (a) the fields in the interfering electromagnetic waves, and (b) ...

... the cervix. This test is performed to evaluate fetal heart rate and variability between beats, especially in relation to ...

Several laser plasma accelerator schemes are reviewed, with emphasis on the Plasma Beat Wave Accelerator (PBWA). Theory indicates that a very high acceleration gradient, of order 1 GeV/m, can exist in the plasma wave driven by the beating lasers. Experimental results obtained on the PBWA ...

Particle motion in a laser beat-wave plasma field with a transverse magnetic field is explored. It is determined that stable, phase-space buckets for acceleration are established by these fields and that particles injected near the beat-wave phase velocity can be trapped in these buckets and accelerated ...

Heart rate is an important parameter of fetal well-being. We have analyzed fetal heart rate (HR) and heart rate variability (HRV) by fetomaternal electrocardiography (ECG) in the horse (Equus caballus) from midpregnancy to foaling. It was the aim of the study to detect changes in the regulation of fetal cardiac activity over time and ...

This paper discusses the acceleration of charged particles by electromagnetic fields, i.e., by fields that are produced by the motion of other charged particles driven by some power source. The mechanisms that are discussed include: Ponderamotive Forces, Acceleration, Plasma Beat Wave Acceleration, Inverse Free ...

An apparatus for acquiring signals emitted by a fetus, identifying fetal heart beats and determining

An apparatus for acquiring signals emitted by a fetus, identifying fetal heart beats and determining

Jun 10, 2011 ... The Continuous Blood Pressure Device (CBPD) is a noninvasive beat-to-beat blood pressure, heart rate, and electrocardiogram (ECG) ...

... Beat number, time of occurrence of beat, heart rate preejection period (PEP), preejection period index (PEPI), left ventricular ejection time (LVEF ...

... Accession Number : AD0775387. Title : Detection of REM, 1 Sleep Stage and Eye Movement from Beat-to-Beat Heart Rate. ...

1 of 4 Abstract- We propose a new ectopic beat correction algorithm for Heart Rate Variability (HRV) that is based on the Integral Pulse Frequency ...

To investigate the roles that the community effect and entrainment function of cultured cardiomyocyte play in decreasing beating fluctuation and reestablishing synchronized beating, we developed a single-cell-based two-dimensional network culture assay to measure and compare the dynamics of beating rhythm synchronization of individual ...

The surfatron laser-plasma accelerator is an extension of the plasma beat wave accelerator scheme. It utilizes very intense electric fields, 10/sup 9/ to 10/sup 10/ V/cm, associated with focussed laser beams to accelerate particles. (GHT)

We review the progress made on several schemes for acceleration in a plasma medium. The beat wave accelerator is becoming fairly well developed with recent advances made on theoretical, computational, and experimental fronts. Progress on three new concepts, the surfatron, the plasma wakefield, and the plasma grating or rippled plasma ...

Recently attention has focused on charged particle acceleration in a plasma by a fast, large amplitude, longitudinal electron plasma wave. The plasma beat wave and plasma wakefield accelerators are two efficient ways of producing ultra-high accelerating g...

Proton and electron motion in a laser beat-wave accelerator with a transverse magnetic field is explored. Parameters of stable acceleration are determined analytically and by simulation. The effects of synchrotron radiation on electron acceleration are also explored.

The experiment investigated the effect of increased information processing on heart beat and sinus arrhythmia. A measure of sinus arrhythmia was developed which considered the are between the electrocardiogram rate curve and the average heart beat line. S...

Jaundiced serum, from common bile duct ligated rats, added to cultured heart cells decreased the beating rate and caused an early cessation of beating. Similarly it produced higher levels of lactate in the media. Deoxychloic acid but not cholic acid which...

A large-amplitude beat wave excited at the beat frequency of two co-propagating laser beams is extremely unstable and suffers strong three- and four-wave parametric instabilities with large growth rates. The relativistic effects are seen to be negligible ...

Selected examples of advanced accelerator concepts are reviewed. Such plasma accelerators as plasma beat wave accelerator, plasma wake field accelerator, and plasma grating accelerator are discussed particularly as examples of concepts for accelerating ...

Fiber-based drive lasers now produce all of the spin-polarized electron beams at CEBAF/Jefferson Lab. The flexibility of these drive lasers, combined with the existing three-beam CEBAF photoinjector Chopper, provides a means to implement a beat frequency technique to produce long time intervals between individual electron microbunches (tens of nanoseconds) by merely varying ...

... rate initiated within the ventricles, typically at 160 - 240 beats per minute (normal resting rate is 60 - ...

The beat wave accelerator depends on the generation of a large amplitude plasma wave with a phase velocity close to the velocity of light c. The plasma wave ( omega sub(p), ksub(p)) is generated by beating colinear laser beams ( omega sub 1 , k sub 1 ) an...

The paper deals with the Rutherford Appleton Laboratory (RAL) study of the beat-wave particle accelerator, intended for high energy physics. Three factors; the build-up of beat-wave, the surfatron concept and the self-focusing effects are considered in th...

The possibility of using intense plasma waves to accelerate particles to high energy is discussed. This is of interest because of the very intense electric fields that can be generated (Eapprox. =..sqrt..n/sub e/ Volts/cm) and the fact that the phase velocity can be essentially the speed of light. Particular attention is given to generating the waves by two intense laser beams ...

Recently, a strong research effort has been focused on applications of beat waves in plasma interactions. This research has important implications for various aspects of plasma physics and plasma technology. This article reviews the present status of the field and comments on plasma probing, heating of magnetically confined and laser plasmas, ionospheric plasma modification, ...

Pulsed rf heating is a fundamental limit on high-gradient acceleration in copper structures. Reduction of pulsed heating is favored by a short exposure time for the copper; yet in conventional accelerators, efficiency requires an exposure time of order a ...

This report discusses the suitability of four novel particle acceleration technologies for multi-TeV particle physics machines: laser driven linear accelerators (linac), plasma beat-wave devices, plasma wakefield devices, and switched power and cavity wak...

The protocol for the determination of the speed/heart rate relationship during incremental exercise previously described (so-called Conconi test) has been refined and in part modified during 12 years of application. The new protocol calls for time-based increments in exercise intensity that are uniform up to submaximal speeds and progressively greater in the final phase. As in ...

Monitoring the physiological status and behaviour of free-swimming fishes remains a challenging task, although great promise stems from techniques such as biologging and biotelemetry. Here, implanted data loggers were used to simultaneously measure heart rate (f (H)), visceral temperature, and a derivation of acceleration in two groups of wild adult ...

Although a sinusoidal bias method is introduced to avoid working in the death band for a majority of time, the mechanical dithered ring laser gyro (RLG) still encounters information loss when crossing the zero rate point. A novel lock-in error correction method is proposed which can pick up the lost information and remove the random walk error radically. The lost information ...

Interest in using sleep stage patterns to determine the amount and quality of a pilot or astronaut's sleep has led to a series of Air Force sponsored studied. The ultimate goal of these studies is to be able to determine sleep stage from beat-by-beat hear...

Acceleration of embryonic rotation is a common response to hypoxia among pond snails. It was first characterized in Helisoma trivolvis embryos, which have a pair of sensorimotor neurons that detect hypoxia and release serotonin onto postsynaptic ciliary cells. The objective of the present study was to determine how the hypoxia response is mediated in Lymnaea stagnalis, which ...

Several plasma accelerator concepts are reviewed, with emphasis on the Plasma Beat Wave Accelerator (PBWA) and the Plasma Wake Field Accelerator (PWFA). Various accelerator physics issues regarding these schemes are discussed, and numerical examples on laboratory scale experiments are given. ...

... Light sensitivity accelerated the dark adaptation time as measured with ... 0.1% solution caused undersired effects: vertigo, increased heart 'beat,' and ...

... The plot shows a heating threshold in wave power (amplitude) at about 2 W above which there is significant heating for both BEW and SEW ...

... heart. The arteries are the vessels with the "pulse", a rhythmic pushing of the blood in the ... heart rate, one feels the beats at a pulse point like the inside of the wrist for ...

Nonlinear saturation of laser driven plasma beat wave by oscillating two-stream instability D. N due to the laser beams. As time grows, the plasma beat wave acquires large amplitude and it becomes laser-based charge particle accelerators.4,5 In the latter, the plasma waves are driven

The ladder diagram illustrates a Wenckebach type AV block by the increasing PR intervals before the blocked P wave. After the blocked P wave, however, a rev-ed up junctional pacemaker terminates the pause. Note that the junctional beats have a slightly different QRS morphology from the sinus beats making them more easily recognized. Note also the AV ...

LifeWave energy patches are novel nanoscale semiconducting biomolecular antennas, that when placed in the oscillating bioelectromagnetic field of the body, resonate at frequencies in unison with certain biomolecules in the cells and signal specific metabolic pathways to accelerate fat metabolism. As a consequence of accelerated fat burning more cellular ...

Recent data suggest that fetal breathing movement incidence declines while fetal heart rate (FHR) and body movement incidence do not change within 72 hours of spontaneous term labor. We conducted a retrospective study to determine whether the length of time from testing to spontaneous labor onset could influence these biophysical test parameters. Eighty-one normal term fetuses ...

In this study we investigate the relationship between beat and musical performance. It is hypothesised that listeners prefer beat sequences that are smoother than beat tracks that are fully aligned with the actual onsets of performed notes. In order to examine this hypothesis, an experiment was designed whereby six different ...

A modified version of the Plasma Beat-Wave Accelerator scheme is introduced and analyzed, which is based on autoresonant phase-locking of the nonlinear Langmuir wave to the slowly chirped beat frequency of the driving lasers via adiabatic passage through resonance. This new scheme is designed to overcome some of the well-known ...

A portable and cost-effective real-time cardiotoxicity biosensor was developed using a CMOS imaging module extracted from a commercially available webcam. The detection system consists of a CMOS imaging module, a white LED and a pinhole. Real-time image processing was conducted by comparing reference and live frame images. To evaluate the engineered system, the effects of two different drugs, ...

The present study investigated affective and physiological responses to changes of tempo and mode in classical music and their effects on heat pain perception. Thirty-eight healthy non-musicians (17 female) listened to sequences of 24 music stimuli which were variations of 4 pieces of classical music. Tempo (46, 60, and 95 beats/min) and mode (major and minor) were manipulated ...

We introduce and analyze the concept of a wakeless triple soliton accelerator in a plasma fiber. Under appropriate conditions the triple soliton with two electromagnetic and one electrostatic waves in the beat-wave resonance propagates with velocity c lea...

Three subjects rested in the supine position, arose quickly, and ran for 1 min on a treadmill. Then they stood erect for 1 min and ran again. For the first 30 beats at the beginning of the run, their cardiac acceleration was greater after supine than afte...

1. Action potentials from sinus venosus and auricle fibers of spontaneously beating frog hearts have been recorded with intracellular electrodes. 2. Sinus fibers show a slow depolarization, the pacemaker potential, during diastole. The amplitude of this potential varies in different parts of the sinus. In some fibers the membrane potential falls by 11 to 15 mv. during diastole ...

Ca(+)-induced Ca(2+) release tightly controls the function of ventricular cardiac myocytes under normal and pathological conditions. Two major factors contributing to the regulation of Ca(2+) release are the cytosolic free Ca(2+) concentration and sarcoplasmic reticulum (SR) Ca(2+) content. We hypothesized that the amount of Ca(2+) released from the SR during each heart beat ...

Ca⁺-induced Ca²⁺ release tightly controls the function of ventricular cardiac myocytes under normal and pathological conditions. Two major factors contributing to the regulation of Ca²⁺ release are the cytosolic free Ca²⁺ concentration and sarcoplasmic reticulum (SR) Ca²⁺ content. We ...

The possibility of enhancing the energy gain in laser-driven accelerators by using Bessel laser beams is examined. Scaling laws are derived for the propagation length, acceleration gradient, and energy gain in various accelerators for both Gaussian and Bessel beam drivers. For equal beam powers, the energy gain can be increased by a ...

The purpose of this activity is to discover and learn about heart rate and the function of the heart. The students will investigate whether their hearts beat slower/faster at different times; develop an understanding of why their hearts beat slower/faster at different times; use data to develop an explanation of why their hearts ...

This complicated rhythm strip illustrates 'supernormal' conduction... a situation where conduction is better than expected. The ladder diagram shows that the accelerated ventricular rhythm prevents most of the sinus impulses from reaching the ventricles. Only appropriately timed sinus impulses reach the ventricle - indicated by the "C" or capture beats. ...

A review is given of energy cascading in the beat-wave accelerator. The properties of the electromagnetic cascade and the corresponding plasma-wave evolution are well understood within the framework of an approximate analytic model. Based on this model, idealized laser-plasma coupling efficiencies of the order of 10% do not seem unreasonable. 28 refs.

Motile cilia in the airway epithelium are the engine for mucociliary clearance, the mechanism responsible for cleaning the airways from inhaled particles. Human airway epithelial cilia appear to have a slow constitutive rate of beating, driven by inherent and spontaneous dynein ATPase activity. Additionally, cilia can increase their ...

Background and purpose? Stem cell transplantation therapy is a promising alternative treatment for severe ischemic heart disease. Although dimethyl sulfoxide (DMSO) is known to differentiate P19CL6 embryonic carcinoma cells into cardiomyocyte-like cells, the low differentiation capacity of DMSO reduces its usefulness. To develop new inducing factors that promote a high degree of differentiation, ...

The coherent excitation of several atomic states by inelastic electron scattering and their subsequent radiative decay is considered. General expressions are derived for the photon counting rate in a quantum-beat experiment, and for the total number of ph...

The performance, of an amplifier cascade system is taken to be the product of transmission bit rate, B, and transmission distance, L. In amplifier cascade systems using the IM/DD scheme, signal spontaneous beat noise, spontaneous-spontaneous beat noise an...

This investigation will measure the magnitude of the reduction in cycle ergometry invalid test results manifested by a change in the definition of steady-state heart rate from 3 beats per minute to 5 or 6 beats per minute. It will further assess the possi...

The study of the effect of thermal pollution on the respiration and heart beat of certain fishes has definite implications on the biology of water pollution, the standard of observation and measurement of temperature of environmental surface water, and th...

Apr 21, 2011 ... The Finapres Automated Blood Pressure (ABP) device is a continuous, non-invasive beat-to-beat blood pressure and heart rate measurement ...

a passive fetal heart rate monitoring Sensor and steps for determining a fetal heart rate based on the identified heart 5 beats. ...

The rate of heart beat is controlled by autonomic nervous system: accelerated by the sympathetic system and slowed by the parasympathetic system. Scaling properties in heart rate are usually related to the intrinsic dynamics of this physiological regulatory system. The two packages calculating local exponent ...

Recently there has been a great interest in laser-plasma accelerators as possible next-generation particle accelerators because of their potential for ultra high accelerating gradients and compact size compared with conventional accelerators. It is known that the laser pulse is capable of exciting a plasma wave ...

1. Heart rates of beaver (Castor canadensis) under free-ranging captive conditions for active behaviors and resting in water (approximately 121 beats/min) were significantly (P less than 0.01) higher than for resting on land (100 beats/min). 2. Although no transient recovery tachycardia was evident in swimming heart ...

A miniaturized, telemetric, photoplethysmograph sensor for long-term, continuous monitoring is presented in this thesis. The sensor, called a "ring sensor, " is attached to a finger base for monitoring beat-to-beat pulsation, and the data is sent to a host computer via a RF transmitter. Two major design issues are addressed: one is to minimize motion ...

Chronic acceleration effects on animals, considering growth rate, food intake, oxygen metabolism and

... Accession Number : AD0863519. Title : An Investigation of the Effects of Acceleration on the Burning Rates of Solid Propellants. ...

... Title : AN INVESTIGATION OF THE EFFECT OF ACCELERATION ON THE BURNING RATE OF COMPOSITE PROPELLANTS. ...

... Title : AN INVESTIGATION OF THE EFFECT OF ACCELERATION ON THE BURNING RATE OF COMPOSITE PROPELLANTS. ...

At mating, mammalian sperm are diluted in the male and female reproductive fluids, which brings contact with HCO(3)(-) and initiates several cellular responses. We have identified and studied two of the most rapid of these responses. Stop-motion imaging and flagellar waveform analysis show that for mouse epididymal sperm in vitro, the resting flagellar beat frequency is 2-3 Hz ...