scholarly journals RESEARCH OF DEPENDENCES OF RELIABILITY INDICATORS OF APAR ON THE CORE TEMPERATURE OF A GAN CRYSTAL TRANSISTORS

2019 ◽  
Vol 42 (2) ◽  
Author(s):  
Валерій Вікторович Костановський
Keyword(s):  
Core Temperature ◽  
The Core ◽  
Reliability Indicators ◽  
Gan Crystal

scholarly journals Temperature Monitoring and Perioperative Thermoregulation

2008 ◽  
Vol 109 (2) ◽  
pp. 318-338 ◽  
Author(s):  
Daniel I. Sessler ◽  
David S. Warner ◽  
Mark A. Warner
Keyword(s):  
Body Temperature ◽  
General Anesthesia ◽  
Core Temperature ◽  
Core Body Temperature ◽  
Neuraxial Anesthesia ◽  
General Anesthetics ◽  
The Core ◽  
Core Body ◽  
Dose Dependent ◽  
Body Heat

Most clinically available thermometers accurately report the temperature of whatever tissue is being measured. The difficulty is that no reliably core-temperature-measuring sites are completely noninvasive and easy to use-especially in patients not undergoing general anesthesia. Nonetheless, temperature can be reliably measured in most patients. Body temperature should be measured in patients undergoing general anesthesia exceeding 30 min in duration and in patients undergoing major operations during neuraxial anesthesia. Core body temperature is normally tightly regulated. All general anesthetics produce a profound dose-dependent reduction in the core temperature, triggering cold defenses, including arteriovenous shunt vasoconstriction and shivering. Anesthetic-induced impairment of normal thermoregulatory control, with the resulting core-to-peripheral redistribution of body heat, is the primary cause of hypothermia in most patients. Neuraxial anesthesia also impairs thermoregulatory control, although to a lesser extent than does general anesthesia. Prolonged epidural analgesia is associated with hyperthermia whose cause remains unknown.

Abstract 10475: Heat Loss Augmented by Extracorporeal Circulation is Associated with Overcooling in Cardiac Arrest Survivors Who Underwent Targeted Temperature Management

Circulation ◽  
2021 ◽  
Vol 144 (Suppl_2) ◽  
Author(s):  
Byungkook Lee ◽  
Dong Hun Lee
Keyword(s):  
Water Temperature ◽  
Core Temperature ◽  
Neurological Outcome ◽  
Temperature Management ◽  
Extracorporeal Circuit ◽  
Matched Cohort ◽  
Maintenance Period ◽  
Neurological Outcomes ◽  
The Core ◽  
Poor Neurological Outcome

Introduction: Extracorporeal circuit-based salvage therapy can affect targeted temperature management (TTM) in comatose out-of-hospital cardiac arrest (OHCA) survivors. We investigated the association of patients with extracorporeal device with TTM and neurological outcome. Methods: We performed a retrospective analysis using prospectively collected data from adult comatose OHCA survivors who underwent TTM between October 2015 and December 2020. We defined patients with ECMO and/or CRRT as the extracorporeal group. We calculated the cooling rate during the induction period; the minimum, maximum, and mean time-weighted core temperatures (TWCT), and the standard deviation (SD) of the core temperature and water temperature during the maintenance period based on the temperature measured every minute. We defined the sum of TWCT more and less than 33°C as positive and negative TWCT, respectively. The primary outcome was a poor neurological outcome, defined as cerebral performance category 3-5. We used propensity score (PS) matching to adjust the characteristics of patients who required an extracorporeal circuit device. Results: Of the 223 included patients, 140 (62.8%) patients had poor neurological outcome and 40 (17.9%) patients were categorized into the extracorporeal group. The extracorporeal group had a rapid cooling rate (2.08°C/h [1.13-3.73] vs. 1.24°C/h [0.77-1.79]; p < 0.001). The extracorporeal group had lower mean core temperature; higher core temperature SD; lower positive TWCT; higher negative TWCT; and higher maximum, minimum, and mean water temperature than the no-extracorporeal group. In PS matched cohort, the extracorporeal group had a lower minimum core temperature, lower mean core temperature, higher core temperature SD, higher negative TWCT, higher maximum water temperature, and higher mean water temperature. The neurological outcomes were not different between the two groups, in either the whole or PS-matched cohort. Conclusions: The extracorporeal group achieved the target temperature earlier. The core temperature distribution during the maintenance period was further skewed below 33°C in the extracorporeal group. The extracorporeal group had similar neurological outcomes to the no-extracorporeal group.

Simulating the action of zeitgebers on a coupled two-oscillator model of the human circadian system

1984 ◽  
Vol 247 (3) ◽  
pp. R418-R426
Author(s):  
P. H. Gander ◽  
R. E. Kronauer ◽  
C. A. Czeisler ◽  
M. C. Moore-Ede
Keyword(s):  
Core Temperature ◽  
Activity Rhythm ◽  
Human Subjects ◽  
Model Performance ◽  
The Other ◽  
Oscillator Model ◽  
Temporal Isolation ◽  
The Core ◽  
Temperature Rhythm ◽  
Rest Activity

Our two-oscillator model was originally designed to describe the circadian rhythms of human subjects maintained in temporal isolation. The performance of this model in response to simulated environmental synchronizing cycles (zeitgebers) is examined here. Six distinct types of synchronization are demonstrated between the x oscillator (postulated to regulate the core temperature rhythm), the y oscillator (postulated to regulate the rest-activity rhythm), and z (the zeitgeber). Four types of synchronization are identifiable, if we consider only the periods of the three oscillators. Both x and y may be synchronized by z; either may synchronize with z while the other exhibits a different period; or x, y, and z may each show different periods. Two further classes of synchronization are discernible when phase criteria are taken into account. When either x or y is on the verge of desynchronizing from the other two oscillators, it undergoes periodic phase modulations while retaining the common overall period. The type of synchronization observed depends on the periods of x, y, and z and on the strength of the z drive. The effects of modifying each of these parameters have been systematically investigated by simulation, and model performance is summarized in terms of range of entrainment "maps." These constitute extensive sets of predictions about expected patterns of entrainment of the core temperature and rest-activity rhythms of human subjects exposed to various environmental zeitgebers. Experimental data are available against which model predictions can be tested.

scholarly journals Optical and X-ray observations of stellar winds in Wolf-Rayet binaries

1995 ◽  
Vol 163 ◽  
pp. 262-270
Author(s):  
A. M. Cherepashchuk
Keyword(s):  
Chemical Composition ◽  
Core Temperature ◽  
Stellar Winds ◽  
Radial Expansion ◽  
Core Radius ◽  
X Ray ◽  
The Core ◽  
Basic Conclusion ◽  
Helium Stars ◽  
Colliding Winds

New spectrophotometric, photometric and polarimetric observations of V444 Cygni confirm the basic conclusion that the WN5 star has a small core radius (rc < 4 R⊙) and a high core temperature (Tc > 60 000 K), which are characteristic of massive helium stars. Values of rc < 3 — 6 R⊙ and Tc > 70 000 — 90 000 K for the core of the WN7 star in the Cygnus X-3 system agree well with this conclusion. A clumping structure of WR winds is suggested. X-ray observations of colliding winds in WR+O binaries suggest radial expansion and anomalous chemical composition of WR winds.

scholarly journals Low-intensity exercise delays the shivering response to core cooling

2019 ◽  
Vol 316 (5) ◽  
pp. R535-R542 ◽  
Author(s):  
Tomomi Fujimoto ◽  
Bun Tsuji ◽  
Yosuke Sasaki ◽  
Kohei Dobashi ◽  
Yasuo Sengoku ◽  
...  
Keyword(s):  
Core Temperature ◽  
Thermal Sensation ◽  
Water Immersion ◽  
Hot Water ◽  
Temperature Threshold ◽  
Cool Water ◽  
Low Intensity ◽  
The Core ◽  
Core Cooling ◽  
Low Intensity Exercise

Hypothermia can occur during aquatic exercise despite production of significant amounts of heat by the active muscles. Because the characteristics of human thermoregulatory responses to cold during exercise have not been fully elucidated, we investigated the effect of low-intensity exercise on the shivering response to core cooling in cool water. Eight healthy young men (24 ± 3 yr) were cooled through cool water immersion while resting (rest trial) and during loadless pedaling on a water cycle ergometer (exercise trial). Before the cooling, body temperature was elevated by hot water immersion to clearly detect a core temperature at which shivering initiates. Throughout the cooling period, mean skin temperature remained around the water temperature (25°C) in both trials, whereas esophageal temperature (Tes) did not differ between the trials ( P > 0.05). The Tes at which oxygen uptake (V̇o2) rapidly increased, an index of the core temperature threshold for shivering, was lower during exercise than rest (36.2 ± 0.4°C vs. 36.5 ± 0.4°C, P < 0.05). The sensitivity of the shivering response, as indicated by the slope of the Tes-V̇o2 relation, did not differ between the trials (−441.3 ±177.4 ml·min−1·°C−1 vs. −411.8 ± 268.1 ml·min−1·°C−1, P > 0.05). The thermal sensation response to core cooling, assessed from the slope and intercept of the regression line relating Tes and thermal sensation, did not differ between the trials ( P > 0.05). These results suggest that the core temperature threshold for shivering is delayed during low-intensity exercise in cool water compared with rest although shivering sensitivity is unaffected.

scholarly journals Improving Thermal Conductivity Coefficient in Oriented Strand Lumber (OSL) Using Sepiolite

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 599 ◽  
Author(s):  
Hamid R. Taghiyari ◽  
Abolfazl Soltani ◽  
Ayoub Esmailpour ◽  
Vahid Hassani ◽  
Hamed Gholipour ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Core Temperature ◽  
Thermal Conductivity Coefficient ◽  
Urea Formaldehyde ◽  
Wood Products ◽  
Raw Material ◽  
Formaldehyde Resin ◽  
The Core ◽  
Uf Resin ◽  
Hardness Values

An issue in engineered wood products, like oriented strand lumber (OSL), is the low thermal conductivity coefficient of raw material, preventing the fast transfer of heat into the core of composite mats. The aim of this paper is to investigate the effect of sepiolite at nanoscale with aspect ratio of 1:15, in mixture with urea-formaldehyde resin (UF), and its effect on thermal conductivity coefficient of the final panel. Sepiolite was mixed with UF resin for 20 min prior to being sprayed onto wood strips in a rotary drum. Ten percent of sepiolite was mixed with the resin, based on the dry weight of UF resin. OSL panels with two resin contents, namely 8% and 10%, were manufactured. Temperature was measured at the core section of the mat at 5-second intervals, using a digital thermometer. The thermal conductivity coefficient of OSL specimens was calculated based on Fourier’s Law for heat conduction. With regard to the fact that an improved thermal conductivity would ultimately be translated into a more effective polymerization of the resin, hardness of the panel was measured, at different depths of penetration of the Janka ball, to find out how the improved conductivity affected the hardness of the produced composite panels. The measurement of core temperature in OSL panels revealed that sepiolite-treated panels with 10% resin content had a higher core temperature in comparison to the ones containing 8% resin. Furthermore, it was revealed that the addition of sepiolite increased thermal conductivity in OSL panels made with 8% and 10% resin contents, by 36% and 40%, respectively. The addition of sepiolite significantly increased hardness values in all penetration depths. Hardness increased as sepiolite content increased. Considering the fact that the amount of sepiolite content was very low, and therefore it could not physically impact hardness increase, the significant increase in hardness values was attributed to the improvement in the thermal conductivity of panels and subsequent, more complete, curing of resin.

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