Hand-Skin Temperature and Dexterity

1979 ◽  
Vol 23 (1) ◽  
pp. 183-187
Author(s):  
Michael W. Riley ◽  
Denise M. Allison
Keyword(s):  
Ambient Temperature ◽  
Skin Temperature ◽  
Research Study ◽  
Measurement Methods ◽  
Industrial Worker ◽  
Male And Female ◽  
Assembly Task ◽  
Ambient Temperatures ◽  
Better Than ◽  
Female Subjects

This research study examined the dexterity performance of both male and female subjects at ambient temperatures of 35°, 55° and 75°F. Subjects wore typical industrial worker apparel without gloves. Four dexterity measurement methods were used. These were 1) Purdue Pegboard, 2) pencil point tapping, 3) an assembly task, and 4) a fine manipulative task. The subject's performance scores at the various tasks were correlated with the ambient temperature and the hand-skin temperature. Results indicate that females scored better than males on the Purdue Pegboard and a fine manipulative task at all temperatures, while males scored better in pencil point tapping and an assembly task.

Cognitive Differences between the Sexes in Memory for Names and Faces

1977 ◽  
Vol 45 (1) ◽  
pp. 317-318 ◽  
Author(s):  
Marilyn A. Borges ◽  
Linda S. Vaughn
Keyword(s):  
College Students ◽  
Female College Students ◽  
Cognitive Differences ◽  
Male And Female ◽  
Female College ◽  
Face Matching ◽  
Matching Test ◽  
Test Female ◽  
Better Than ◽  
Female Subjects

22 male and 22 female college students were shown 30 pairs of faces and names to learn. Subsequent tests indicated that all students recognized more female stimuli than male stimuli and more names than faces. On the name-face matching test, female subjects performed better than did males, and male and female stimuli were matched equivalently.

The Study of Comparative Characterization between SiC MOSFET and Si- IGBT for Power Module and Three-Phase SPWM Inverter

2020 ◽  
Vol 1004 ◽  
pp. 1045-1053
Author(s):  
Heng Lee ◽  
Chun Kai Liu ◽  
Tao Chih Chang
Keyword(s):  
Ambient Temperature ◽  
Junction Temperature ◽  
System Level ◽  
Switching Frequency ◽  
Power Module ◽  
Ambient Temperatures ◽  
Three Phase ◽  
Type Power ◽  
Three Phase Inverter ◽  
Better Than

This paper focuses on how to define and integrate the system level and power module level with optimal conditions in SiC and Si-IGBT. To investigate the above situation, we compare the performance of SiC and Si-IGBT in power module and system level at different ambient temperatures. At the same maximum junction temperature 150°C and ambient temperature at 25°C and 80°C, it found that SiC type electrical resistance, maximum endurable current, and voltage could be better than the IGBT type power module above 20%. On the other hand, the simulation of three-phase inverter at different switching frequency such as 10kHz, 15kHz, 20kHz, 30kHz and it had been observed that the power loss of SiC inverter are 78% less for 10kHz switching frequency; 82% less for switching frequency at 15kHz; 85% less for 20kHz of switching frequency; 89% less for switching frequency at 30kHz in the Si-IGBT three-phase SPWM inverter at ambient temperature 80°C.

A mechanism by which helium increases metabolism in small mammals

1960 ◽  
Vol 199 (2) ◽  
pp. 243-245 ◽  
Author(s):  
H. A. Leon ◽  
S. F. Cook
Keyword(s):  
Thermal Conductivity ◽  
Oxygen Consumption ◽  
Ambient Temperature ◽  
Skin Temperature ◽  
Heat Loss ◽  
Small Mammals ◽  
Thermal Gradient ◽  
Oxygen Mixture ◽  
Ambient Temperatures ◽  
Long Evans

The oxygen consumption of male Long-Evans rats was determined at three different ambient temperatures in air and in an equivalent helium-oxygen mixture. It was found that when the ambient temperature is near the skin temperature of the rat, the effect of helium is insignificant. If the ambient temperature is lowered, helium induces an increased metabolism over air at the same temperature. Since helium has a thermal conductivity about six times greater than nitrogen, it is concluded that the accelerated metabolism is in response to the greater heat loss in the presence of helium and the magnitude of this response is proportional to the thermal gradient between the animal and the environment.

Effects of Sex of Pressuring Group, Perception of Ability, and Sex of Communicator Influencing Perceived Ability on Conformity of Males and Females

1979 ◽  
Vol 44 (3) ◽  
pp. 719-726 ◽  
Author(s):  
Diane R. Follingstad
Keyword(s):  
Sex Differences ◽  
Male And Female ◽  
Differential Effects ◽  
Female Data ◽  
Males And Females ◽  
Group Perception ◽  
Independent Behavior ◽  
Male Subjects ◽  
Better Than ◽  
Female Subjects

This study assessed the differential effects of sex of pressuring confederates and perception of ability on conforming behavior of males and females. Varying male and female sources of the communication to influence subjects' views of their ability was expected to produce less conformity in females receiving the information from a male rather than a female. Data on undergraduates showed 64 females did not conform significantly more than 64 males, but male subjects conformed more in the presence of male confederates while females conformed significantly more when led to believe that males were more accurate on the task. Only the male source influencing females to believe they were superior on the task resulted in significantly less conformity in female subjects. Considering sex differences is essential due to the finding that the sexes responded to different variables present in most conformity experiments. The decrease in conformity produced in females when told by a male that females do better than males has implications for the use of male sources of communication to increase independent behavior of women.

Thermal comfort in relation to mean skin temperature

1970 ◽  
Vol 48 (2) ◽  
pp. 98-101 ◽  
Author(s):  
E. D. L. Topliff ◽  
S. D. Livingstone
Keyword(s):  
Thermal Comfort ◽  
Ambient Temperature ◽  
Skin Temperature ◽  
Incident Radiation ◽  
Mean Skin Temperature ◽  
Ambient Temperatures ◽  
The Mean ◽  
Per Se

Nude men were exposed to a range of ambient temperatures and were brought to a condition of thermal comfort by adjustment of the incident radiation. The mean skin temperature associated with comfort was found to be different for each combination of ambient temperature and incident radiation. It was evident that mean skin temperature, per se, was not a dependable criterion of thermal comfort.

Shorn and unshorn Awassi sheep IV. Skin temperature and changes in temperature and humidity in the fleece and its surface

1963 ◽  
Vol 60 (2) ◽  
pp. 183-193 ◽  
Author(s):  
E. Eyal
Keyword(s):  
Ambient Temperature ◽  
Skin Temperature ◽  
Vapour Pressure ◽  
The Sun ◽  
Direct Sunlight ◽  
Ambient Temperatures ◽  
Awassi Sheep ◽  
Break Points ◽  
Environmental Temperatures ◽  
Skin Temperatures

1. A comparison was made between the skin temperature, humidity and temperature within and on the surface of the fleece of unshorn and shorn sheep. This study was conducted during various seasons of the year, at different environmental temperatures, while sheep were maintained in the shade or subjected to direct sunlight.2. Accompanying the rise of ambient temperature (in the shade) from 10 to 43° C. there was an increase in skin temperature from 34 to 40° C. and from 28 to 40° C. of the unshorn and shorn sheep, respectively.3. The relationship between the rise in skin temperature and that of ambient temperature was not linear, but showed a stepwise pattern in which the ‘breaks’ occurred at similar environmental temperatures for both groups, although skin temperatures of shorn sheep were lower than the unshorn.4. The diurnal change in skin temperature of the shorn sheep was similar to that of the ambient temperature. The decrease in skin temperature of unshorn sheep sometimes lagged behind the fall in environmental temperature. The seasonal variations between summer and winter were more significant in shorn than in unshorn sheep.5. Fleece surface temperatures measured at the same ambient temperatures ranged between 13 and42° C. and 16·5–39·5° C. in the unshorn and shorn sheep, respectively. In the break points of the rise in skin temperature, there occurred a drop in temperature gradients between the skin and fleece surface. This probably indicates a rise in thermal conductivity of the fleece at these points.6. The temperature gradient per unit of fleece thickness is inversely related to the depth of fleece and is greater the nearer to the skin.7. With exposure to the sun, skin temperatures of both groups greatly increased and occasionally reached 47° C. Under these conditions the differences between shorn and unshorn groups were not consistent.8. Fleece temperatures of unshorn sheep increased greatly upon exposure to the sun. The maximal temperatures were recorded midway between the fleece surface and skin. These temperatures generally reached 55° C. and sometimes even exceeded 60° C.9. At ambient temperatures of 30–35° C. the vapour pressure close to the skin of unshorn sheep ranged between 35–40 mm. Hg. With shorn sheep, however, the vapour pressure close to the skin was similar to that of the environment. In Yotvata there was a rise in vapour pressure close to the skin when the ambient temperature increased to 40–43° C. This rise in humidity was paralleled by a rise of vapour pressure throughout the wool. It was not linear but rather showed a ‘step-wise’ pattern.10. The vapour pressure in fleece and near the skin of sheep subjected to direct sunlight increased considerably (up to 80 mm. Hg). This rise showed a wave-like curve with various degrees of persistency. Appearance of fluid on the skin of Awassi sheep was observed on several occasions.

Rabbit's ear in cold acclimation studied on the change in ear temperature

1975 ◽  
Vol 38 (3) ◽  
pp. 389-394 ◽  
Author(s):  
E. Harada ◽  
T. Kanno
Keyword(s):  
Ambient Temperature ◽  
Skin Temperature ◽  
Cold Acclimation ◽  
Flow Curve ◽  
Inflection Point ◽  
Ambient Temperatures ◽  
The Mean ◽  
Vascular Beds ◽  
Qualitative Index

The role of the rabbit's ear in cold acclimation was studied by varying the temperature of a climatic room in the range from -10 to +30 degrees C; The skin temperature in a nonanesthetized rabbit's ear showed a characteristic response to changes in ambient temperatures; plotting the ear temperature against the ambient temperature yielded an S-shaped curve. The mean ambient temperature corresponding to the inflection point on the S-shaped curve shifted significantly from about 13 degrees C to about 8 degrees C after cold acclimated of a group fed for 7 wk at -10 degrees C. The shift of the S-shaped curve after cold acclimation may not be due to the change in the norepinephrine sensitivity of the vascular beds of the ear: the effect of norepinephrine on the pressure-flow curve in the isolated rabbit's ear was almost unchanged between the control and the cold-acclimated groups. It is proposed that the shift of the inflection point gives a qualitative index of the acclimated state of the rabbit at a particular temperature.

Role of skin temperature in the control of sweating

1979 ◽  
Vol 47 (3) ◽  
pp. 591-597 ◽  
Author(s):  
T. V. McCaffrey ◽  
R. D. Wurster ◽  
H. K. Jacobs ◽  
D. E. Euler ◽  
G. S. Geis
Keyword(s):  
Steady State ◽  
Ambient Temperature ◽  
Skin Temperature ◽  
Upper Body ◽  
Lower Body ◽  
Sweating Rate ◽  
Ambient Temperatures ◽  
Rate Versus ◽  
Male Subjects

In five male subjects tympanic membrane temperature (Tty), rectal temperature, skin temperatures at 12 sites were simultaneously recorded. Local sweating rate was measured at six sites using resistance hygrometry. After steady-state sweating was established, the lower body was heated at ambient temperatures of 50, 60, 70, and 80 degrees C or cooled at an ambient temperature of 29 degrees C while the upper body remained at a constant ambient temperature. During lower body heating or cooling, Tty was maintained constant by the drinking of cold (10 degrees C) or warm (45 degrees C) water. Sweating rate on both upper and lower body surfaces was proportional to lower body skin temperature. The regression coefficients for sweating rate versus mean lower body skin temperature varied from 0.03 to 0.09 mg/cm2.min. degrees C between subjects, but were not significantly different from each other (P greater than 0.05). This study demonstrates an influence of cutaneous thermoreceptors on sweating rate under steady-state conditions.

scholarly journals The Supraclavicular Skin Temperature Response to Mild Cold Stimulation is Dependent on Ambient Temperature

2019 ◽  
pp. 1-5
Author(s):  
Michael E. Symonds ◽  
Helen Budge ◽  
I A Macdonald ◽  
Lindsay Jane Robinson
Keyword(s):  
Ambient Temperature ◽  
Skin Temperature ◽  
Cold Exposure ◽  
Temperature Response ◽  
Ambient Conditions ◽  
Wireless Data ◽  
Cold Stimulation ◽  
Ambient Temperatures ◽  
Brown Adipose ◽  
Supraclavicular Skin Temperature

Purpose: This study investigated the basal activity, and cold-induced thermogenic response, of supraclavicular brown adipose tissue (BAT) under warm (23˚C) and cool (18˚C) ambient conditions using supraclavicular skin temperature as a measure of BAT activity. As a highly metabolic, heat-producing tissue, it has been hypothesised that under-active/dysfunctional BAT may underlie a pathological energy imbalance leading to obesity. Methods: Five lean, healthy participants underwent infrared thermography (IRT) of supraclavicular BAT before, and during, mild cold exposure (single-hand immersion in cool water at 20˚C), once at 18˚C and once at 23˚C. Energy expenditure (EE) was measured simultaneously using indirect calorimetry, and mean skin temperature (TMSK) was calculated at 1-minute intervals in parallel to IRT using wireless data loggers. Results: Following 30 minutes of hand cooling, supraclavicular skin temperature (TSCR) rose significantly from baseline at an ambient temperature of 23˚C (∆TSCR: 0.17 ± 0.03˚C, P < 0.01), and EE rose by 0.22 ± 0.02 kJ/min, P < 0.001. At an ambient room temperature of 18˚C, TSCR after hand cooling was similar to baseline, and EE remained unchanged. The TMSK response was indicative of a systemic vasoconstrictive response of similar magnitude in both warm and cool ambient temperatures. Conclusions: At 18˚C in light clothing, BAT may already be maximally stimulated at baseline, and respond minimally to additional cold exposure. Ambient temperature is recognised as a determinant of glucose uptake in BAT. In this study, we show, that it also modulates the TSCR response to further localised cold-stimulation, indicating an effect on BAT thermogenesis.

The effect of ambient temperature on β-adrenergic responsiveness in rats

1979 ◽  
Vol 57 (7) ◽  
pp. 751-755 ◽  
Author(s):  
C. C. Barney ◽  
M. J. Katovich ◽  
M. J. Fregly ◽  
P. E. Tyler ◽  
A. R. Dasler
Keyword(s):  
Ambient Temperature ◽  
Skin Temperature ◽  
Female Rats ◽  
Adrenergic Agonist ◽  
Ambient Temperatures ◽  
Maximal Sensitivity ◽  
Colonic Temperature ◽  
Integrated Responses

The responses of tail skin and colonic temperatures of female rats to ambient temperatures of 20, 22, 24, 26, 28, and 30 °C were measured. Within this range, colonic temperature was stable while tail skin temperature increased linearly with increasing ambient temperature. Administration of the β-adrenergic agonist, d,l-isoproterenol, at 10.0, 25.0, and 62.5 μg/kg, sc, at each ambient temperature was accompanied by increases in tail skin and colonic temperatures that were dependent on both the dose of isoproterenol administered and the ambient temperature. The integrated responses of tail skin temperature following administration of the three doses of isoproterenol were maximal at an ambient temperature of 26 °C while the integrated responses of colonic temperature were maximal at 30 °C. The results suggest that tests of β-adrenergic responsiveness using this technique should be performed at an ambient temperature of 26 °C for maximal sensitivity.

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