Propagation of a Rapid Pulse Through a Relaxing Gas

1972 ◽  
Vol 15 (2) ◽  
pp. 256 ◽  
Author(s):  
D. F. Parker
Keyword(s):  
Rapid Pulse ◽  
Relaxing Gas

Generation of the vorticity mode by sound in a vibrationally relaxing gas

Open Physics ◽  
2012 ◽  
Vol 10 (5) ◽  
Author(s):  
Anna Perelomova ◽  
Pawel Wojda
Keyword(s):  
Dynamical Equation ◽  
Anomalous Absorption ◽  
Acoustic Beam ◽  
Relaxing Gas

AbstractThe procedure of derivation of a new dynamical equation governing the vorticity mode that is generated by sound, is discussed in detail. It includes instantaneous quantities and does not require averaging over sound period. The resulting equation applies to both periodic and aperiodic sound as the origin of the vorticity mode. Under certain conditions, the direction of streamlines of the vorticity mode may be inverted as compared with that in a fluid with standard attenuation. This reflects an anomalous absorption of sound, when transfer of momentum of the vorticity mode into momentum of sound occurs. The theory is illustrated by a representative example of the generation of vorticity in a vibrationally relaxing gas in the field of periodic weakly diffracting acoustic beam.

On the breakdown of characteristics solutions in flows with vibrational relaxation

1967 ◽  
Vol 27 (1) ◽  
pp. 49-57 ◽  
Author(s):  
B. S. H. Rarity
Keyword(s):  
Relaxation Time ◽  
Mach Number ◽  
Supersonic Flow ◽  
Steady Flow ◽  
Speed Of Sound ◽  
Vibrational Relaxation ◽  
Precise Measure ◽  
Derivatives Of ◽  
Relaxing Gas ◽  
Flow Case

The breakdown of the characteristics solution in the neighbourhood of the leading frozen characteristic is investigated for the flow induced by a piston advancing with finite acceleration into a relaxing gas and for the steady supersonic flow of a relaxing gas into a smooth compressive corner. It is found that the point of breakdown moves outwards along the leading characteristic as the relaxation time decreases and that there is no breakdown of the solution on the leading characteristic if the gas has a sufficiently small, but non-zero, relaxation time. A precise measure of this relaxation time is derived. The paper deals only with points of breakdown determined by initial derivatives of the piston path or wall shape. In the steady-flow case, the Mach number based on the frozen speed of sound must be greater than unity.

Two Cases of Psychoses following Influenza, with Autopsies [Due casi di psicosi consecutiva ad influenza, con autopsia]. (Riv. di Pat. Nerv. e Ment., March, 1900.) Camia, M

1901 ◽  
Vol 47 (198) ◽  
pp. 592-593
Author(s):  
J. R. Gilmour
Keyword(s):  
Pyramidal Cells ◽  
Fatty Degeneration ◽  
Post Mortem ◽  
Inflammatory Condition ◽  
Small Patch ◽  
Rapid Pulse ◽  
Mental Symptoms ◽  
Slight Rise ◽  
The Brain

The two cases are very similar. The first, a woman æt. 21, was admitted to the asylum on February 4th. A few days previously she had an attack of influenza, and during convalescence showed mental symptoms—wandering, buying useless articles, religious delusions. The chief symptoms on admission were sleeplessness, sitiophobia, motor agitation, incoherence, involuntary loss of fæces and urine, and destructiveness. She was oblivious to her surroundings. The temperature was slightly increased, pulse 120 per minute, and collapse and death occurred on February 12th. The second case, that of a woman æt. 47, had influenza on January 28th, with pulmonary symptoms. During convalescence she developed delusions that she was lost, became very excited, and entered asylum on February 8th. Her symptoms were very marked—loss of sleep, agitation, incoherence, then slight rise of temperature and rapid pulse; developed broncho-pneumonia, and died on February 13th. At the post-mortem there was found in both cases fatty degeneration of the liver and kidneys, and marked hyperæmia of the brain and meninges. In the second case there was a small patch of broncho-pneumonia. In neither case was there any trace of exudation or softening, or any inflammatory condition in the brain. Microscopically the pyramidal cells in both cases showed marked loss of the chromatic substance, which was disintegrated and diffused throughout the cells. The cells were affected very unequally, some being fairly normal. The vessels in the cortex were gorged with blood.

scholarly journals Study on the Depth, Rate, Shape, and Strength of Pulse with Cardiovascular Simulator

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Ju-Yeon Lee ◽  
Min Jang ◽  
Sang-Hoon Shin
Keyword(s):  
Pulse Wave ◽  
Pulse Diagnosis ◽  
Pulse Wave Propagation ◽  
Reflected Wave ◽  
Slow Pulse ◽  
Rapid Pulse ◽  
Mean Pressure ◽  
The Mean ◽  
Cardiovascular Simulator ◽  
Crank Mechanism

Pulse diagnosis is important in oriental medicine. The purpose of this study is explaining the mechanisms of pulse with a cardiovascular simulator. The simulator is comprised of the pulse generating part, the vessel part, and the measurement part. The pulse generating part was composed of motor, slider-crank mechanism, and piston pump. The vessel part, which was composed with the aorta and a radial artery, was fabricated with silicon to implement pulse wave propagation. The pulse parameters, such as the depth, rate, shape, and strength, were simulated. With changing the mean pressure, the floating pulse and the sunken pulse were generated. The change of heart rate generated the slow pulse and the rapid pulse. The control of the superposition time of the reflected wave generated the string-like pulse and the slippery pulse. With changing the pulse pressure, the vacuous pulse and the replete pulse were generated. The generated pulses showed good agreements with the typical pulses.

Rapid pulse-frequency-number convertor

1971 ◽  
Vol 7 (12) ◽  
pp. 345
Author(s):  
T.H. Thomas
Keyword(s):  
Pulse Frequency ◽  
Rapid Pulse

scholarly journals The effectiveness of inhaled Cannabis flower for the treatment of agitation/irritability, anxiety, and common stress

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Sarah S. Stith ◽  
Xiaoxue Li ◽  
Jegason P. Diviant ◽  
Franco C. Brockelman ◽  
Keenan S. Keeling ◽  
...  
Keyword(s):  
Side Effects ◽  
Fixed Effects ◽  
Symptom Relief ◽  
Observational Research ◽  
User Characteristics ◽  
Product Characteristics ◽  
Symptom Intensity ◽  
Rapid Pulse ◽  
Negative Side Effects ◽  
Symptom Type

Abstract Background An observational research design was used to evaluate which types of commonly labeled Cannabis flower product characteristics are associated with changes in momentary feelings of distress-related symptoms. Methods We used data from 2306 patient-directed cannabis administration sessions among 670 people who used the real-time Cannabis effects recording software, Releaf App, between June 6, 2016, and February 23, 2019, for tracking the effects of Cannabis flower consumption. Fixed effects multivariable panel regression techniques were used to establish overall relief by symptom type and to determine which labeled product characteristics (e.g., subspecies/subtype, inhalation method, and major cannabinoid contents) showed the strongest correlation with changes in momentary feelings of agitation/irritability, anxiety, and stress, along with experienced side effects. Results In total, a decrease in symptom intensity levels was reported in 95.51% of Cannabis usage sessions, an increase in 2.32% of sessions, and no change in 2.16% of sessions. Fixed effects models showed, on average, respondents recorded a maximum symptom intensity reduction of 4.33 points for agitation/irritability (SE = 0.20, p < 0.01), 3.47 points for anxiety (SE = 0.13, p < 0.01), and 3.98 for stress (SE = 0.12, p < 0.01) on an 11-point visual analog scale. Fixed effects regressions showed that, controlling for time-invariant user characteristics, mid and high tetrahydrocannabinol (THC) levels were the primary independent predictor of increased symptom relief, and that when broken out by symptom type, this effect was only statistically significant for our largest sample of users, those reporting anxiety rather than agitation/irritability or stress. Cannabidiol (CBD) levels were generally not associated with changes in symptom intensity levels. In a minority of cannabis use sessions (< 13%), cannabis users reported anxiogenic-related negative side effects (e.g., feeling anxious, irritable, paranoid, rapid pulse, or restless), whereas in a majority of sessions (about 66%), users reported positive anxiolytic side effects (e.g., feeling chill, comfy, happy, optimistic, peaceful, or relaxed). Conclusions The findings suggest the majority of patients in our sample experienced relief from distress-related symptoms following consumption of Cannabis flower, and that among product characteristics, higher THC levels were the strongest predictors of relief.

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