scholarly journals FID navigator-based MR thermometry method to monitor small temperature changes in the brain of ventilated animals

2014 ◽  
pp. n/a-n/a
Author(s):  
Nicolas Boulant ◽  
Michel Bottlaender ◽  
Lynn Uhrig ◽  
Eric Giacomini ◽  
Michel Luong ◽  
...  
Keyword(s):  
Mr Thermometry ◽  
Small Temperature ◽  
Temperature Changes ◽  
The Brain

scholarly journals ANALYSIS OF ANNUAL VARIATIONS IN GROUND TEMPERATURE AT AN OTTAWA SITE

1964 ◽  
Vol 1 (2) ◽  
pp. 146-157 ◽  
Author(s):  
L. W. Gold
Keyword(s):  
Gradual Increase ◽  
Ground Temperature ◽  
Small Temperature ◽  
Temperature Changes ◽  
Annual Variations ◽  
Periodic Fluctuations ◽  
A Site

Observations over a 5-year period at a site at Ottawa showed that the ground temperature had significant Fourier components with period [Formula: see text]and 2 years. The average annual ground temperature and amplitudes of the Fourier components of period 1 year and [Formula: see text] year underwent non-periodic fluctuations of almost 1 C degree at a depth of 10 cm. The amplitude of this fluctuation decreased with depth, and its maximum occurred later in time. There was evidence of a gradual increase in average annual ground temperature amounting to about 0.2 C degree over the 5-year period at the 610-cm depth. The significance of such small temperature changes in areas where the ground temperature is close to 0 °C is pointed out.

Nascent Access Technologies for Individuals with Severe Motor Impairments

2013 ◽  
pp. 720-739
Author(s):  
Sarah Power ◽  
Saba Moghimi ◽  
Brian Nhan ◽  
Tom Chau
Keyword(s):  
Near Infrared ◽  
Scientific Evidence ◽  
Severe Disabilities ◽  
Motor Impairments ◽  
Temperature Changes ◽  
Severe Motor ◽  
The Face ◽  
Physical Access ◽  
Number Of Individuals ◽  
The Brain

As the number of individuals without physical access to communication or environmental interaction escalates, there are increasing efforts to uncover novel and unconventional access pathways. In this chapter, we introduce three emerging access technologies for individuals with severe disabilities: near-infrared spectroscopy, electroencephalographic measurement of visually-evoked potentials and infrared thermographic imaging of the face. The first two technologies harness activity directly from the brain while the third exploits spontaneous temperature changes in the face. For each technology, we discuss the physiological underpinnings, the requisite instrumentation, the scientific evidence to date and the future outlook.

Sweating responses during changes of hypothalamic temperature in the rhesus monkey

1976 ◽  
Vol 40 (5) ◽  
pp. 653-657 ◽  
Author(s):  
K. A. Smiles ◽  
R. S. Elizondo ◽  
C. C. Barney
Keyword(s):  
Rhesus Monkey ◽  
Skin Temperature ◽  
Sweat Rate ◽  
Brain Temperature ◽  
Hypothalamic Area ◽  
Indirect Measurements ◽  
Hypothalamic Temperature ◽  
Temperature Changes ◽  
Experimental Analogue ◽  
The Brain

A technique is presented for preparing a durable thermode implant in the hypothalamus of the rhesus monkey. In unanesthetized monkeys implanted with thermodes in the anterior hypothalamic area of the brain, a linear relation was found between local sweat rates on the general body surface and clamped hypothalamic temperature. Changes in skin temperature were found to shift the hypothalamic set-point temperature at which sweating began but did not alter the gain of the hypothalamic temperature-sweat rate relationship. This study provides direct support for the concept that central brain temperature and skin temperature interact additively in the control of sweating in higher primates. Due to the very close similarity between these responses and those seen with indirect measurements of brain temperature in men, the rhesus monkey is seen as an excellent experimental analogue for studying human thermoregulation.

Small temperature changes matter

2018 ◽  
Vol 1 (4) ◽  
pp. 235-235
Author(s):  
Jan-Stefan Völler
Keyword(s):  
Small Temperature ◽  
Temperature Changes

Modification des pressions intracristallines et intergranulaires des roches soumises aux variations de temperature

1961 ◽  
Vol S7-III (4) ◽  
pp. 338-344 ◽  
Author(s):  
Georges Deicha
Keyword(s):  
Small Temperature ◽  
Temperature Changes ◽  
History Of ◽  
Proper Perspective ◽  
Proper Interpretation ◽  
Tectonic Movements ◽  
Natural Means

Abstract Effects of variations of temperature on intracrystalline and intergranular pressures in rocks are reviewed, with particular stress on the importance of maintaining the several factors involved in proper perspective, in order that sequence of changes in a rock during its history may not be misconstrued and that undue importance is not assigned to a given factor merely because it has been investigated in detail while others have been investigated inadequately. Distinguishing between liquid and gaseous inclusions of mineralogic versus metallogenic periods is especially difficult. Proper interpretation of inclusions ruptured by natural means must be supplemented by painstaking care to recognize the ruptures resulting from artificial means such as those produced in preparation of petrographic specimens, blows of the geologic hammer , and during transportation of samples. Liquid CO<2) and other inclusions have been known to rupture from small temperature changes. Water in inclusions in mineral grains can influence the geochemical constitution of water imprisoned in the sediments at time of deposition. Tectonic movements may rupture inclusions, and thereby influence the geophysical history of rocks.

scholarly journals Autoregulation of the Brain Temperature during Whole Body Hyperthermia

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Haim I. Bicher ◽  
Nodar Mitagvaria ◽  
Marina Devdariani ◽  
Lia Davlianidze ◽  
Marina Nebieridze ◽  
...  
Keyword(s):  
Blood Circulation ◽  
Oxygen Supply ◽  
Brain Temperature ◽  
Whole Body ◽  
Normal Functioning ◽  
Temperature Changes ◽  
Whole Body Hyperthermia ◽  
Upper Limit ◽  
The Central Nervous System ◽  
The Brain

The aim of this study was revealing the temperature changes in rats' brain tissue caused by whole body hyperthermia. The analysis of received results allows to conclude that the brain has a highly secured system of temperature autoregulation against the exogenous temperature changes. The upper limit of this autoregulation (for rats, at least) is in the range of 45°C of environment. An important role in the normal functioning of the brain temperature autoregulation system belongs to Nitric Oxide. The behavioral disorders, observed in animals after whole body hyperthermia (sure within the range of brain temperature autoregulation) are hardly associated with the changes in temperature of the Central Nervous System, but rather have to be mediated by impaired blood circulation and oxygen supply to the brain tissues, caused by the rapid deterioration of the blood rheological properties.

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