scholarly journals Friction forces on human finger skin

2020 ◽  
Vol 724 ◽  
pp. 012059
Author(s):  
C M Oprisan ◽  
B Chiriac ◽  
V Carlescu ◽  
D N Olaru
Keyword(s):  
Friction Forces ◽  
Human Finger ◽  
Finger Skin

Laser Doppler Flow-Meter Assessment of Iontophoretically Applied Norepinephrine on Human Finger Skin Circulation

1986 ◽  
Vol 87 (5) ◽  
pp. 634-636 ◽  
Author(s):  
Lars Erik Lindblad ◽  
Lena Ekenvall ◽  
Klas Ancker ◽  
Håkan Rohman ◽  
P Åke Öberg
Keyword(s):  
Laser Doppler ◽  
Flow Meter ◽  
Laser Doppler Flow ◽  
Doppler Flow ◽  
Skin Circulation ◽  
Human Finger ◽  
Finger Skin

Alpha-adrenoceptors in the vessels of human finger skin

1986 ◽  
Vol 128 (2) ◽  
pp. 219-222 ◽  
Author(s):  
L. E. LINDBLAD ◽  
L. EKENVALL
Keyword(s):  
Alpha Adrenoceptors ◽  
Human Finger ◽  
Finger Skin

Design of a tribometer for investigating tactile perception

2014 ◽  
Vol 232 (6) ◽  
pp. 773-784 ◽  
Author(s):  
Francesco Massi ◽  
Eric Vittecoq ◽  
Eric Chatelet ◽  
Aurelien Saulot ◽  
Yves Berthier
Keyword(s):  
External Noise ◽  
Tactile Perception ◽  
Sliding Contact ◽  
Clear Understanding ◽  
Tactile Sense ◽  
Friction Forces ◽  
Low Amplitude ◽  
Finger Skin ◽  
The Brain ◽  
Experimental Test Bench

The understanding of the tactile perception mechanism implies the reproduction and measurement of friction forces and vibrations induced by the contact between the skin of human fingers and object surfaces. When a finger moves to scan the surface of an object, it activates the receptors located under the skin allowing the brain to identify surfaces and information about their properties. The information concerning the object surface is affected by the forces and vibrations induced by the friction between the skin and the rubbed object. The vibrations propagate in the finger skin and are converted into electric impulses sent to the brain by the mechanoreceptors. Because of the low amplitude of the induced vibrations, it results quite hard to reproduce the tactile surface scanning and measuring it without affecting measurements by external noise coming from the experimental test-bench. In fact the reproduction of the sliding contact between two surfaces implies the relative motion between them, which is obtained by appropriate mechanisms having a more or less complicated kinematics and including several sliding surfaces (bearings, sliders, etc.). It results quite difficult to distinguish between the vibrations coming from the reproduced sliding and the parasitic noise coming from the other sliding contact pairs. This paper presents the design and validation of a tribometer, named TRIBOTOUCH, allowing for reproducing and measuring friction forces and friction induced vibrations that are basilar for a clear understanding of the mechanisms of the tactile sense.

Nifedipine and alpha-adrenoceptor function in human finger skin vessels

1989 ◽  
Vol 37 (2) ◽  
pp. 107-110
Author(s):  
L. E. Lindblad ◽  
L. Ekenvall ◽  
B. -M. Etzell
Keyword(s):  
Alpha Adrenoceptor ◽  
Human Finger ◽  
Finger Skin

scholarly journals Electroadhesion between a flat touchscreen and the human finger with randomly self-affine fractal surface

Friction ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 132-142
Author(s):  
M. Feshanjerdi
Keyword(s):  
Electrostatic Field ◽  
Contact Area ◽  
Skin Surface ◽  
Spectral Density Function ◽  
Bottom Surface ◽  
Average Surface ◽  
Surface Separation ◽  
Perturbation Potential ◽  
Human Finger ◽  
Finger Skin

Abstract In this study, the effects of finger roughness on the electrostatic potential, electrostatic field, and average effective squeezing pressure between a human finger and a touchscreen are calculated by the perturbation method. This theory is an extension of an earlier work by Persson. It is found that an additional potential <ϕ(2)> will appear between the solids when the roughness effect is considered in calculating the perturbation potential. This additional potential is still proportional to the distance ū from the bottom surface. Therefore, the effect of the roughness increases the effective potential <ϕ> between the two solids. As a result, the average electrostatic field and average effective squeezing pressure increase. Using the increased effective squeezing pressure, we obtain the contact area, average surface separation, and friction between a human finger and the surface of a touchscreen. The effect of the roughness of the finger skin on the increased average effective squeezing pressure (electroadhesion) increases the contact area and reduces the average surface separation between the finger skin and touchscreen. Therefore, the finger-touchscreen friction increases. The surface topography for the forefinger skin is also measured by atomic force microscopy to obtain more realistic results. The auto spectral density function for the forefinger skin surface is calculated as well.

alpha-Adrenoceptors and cold-induced vasoconstriction in human finger skin

1988 ◽  
Vol 255 (5) ◽  
pp. H1000-H1003 ◽  
Author(s):  
L. Ekenvall ◽  
L. E. Lindblad ◽  
O. Norbeck ◽  
B. M. Etzell
Keyword(s):  
Laser Doppler ◽  
Local Cooling ◽  
Alpha Adrenoceptors ◽  
Alpha Adrenoceptor ◽  
Adrenoceptor Antagonist ◽  
Doppler Probe ◽  
Human Finger ◽  
Finger Skin

Experiments were designed to determine how cold-induced vasoconstriction is mediated in superficial vessels of human finger skin. alpha-Adrenoceptor antagonists were administered into the finger skin by iontophoresis, and local cooling was applied by a laser-Doppler probe supplied with Peltier elements. Cold-induced vasoconstriction was abolished after administration of the alpha 2-adrenoceptor antagonist rauwolscine but not after the alpha 1-adrenoceptor antagonist doxazosin. The results indicate that vasoconstriction on local cooling in human finger skin is mainly mediated by adrenoceptors of the alpha 2-subtype.

Three-Dimensional Observations Of Microvasculature Of Human Finger Skin

HAND ◽  
1978 ◽  
Vol os-10 (2) ◽  
pp. 144-149 ◽  
Author(s):  
Hajime Inoue
Keyword(s):  
Blood Circulation ◽  
Index Finger ◽  
Normal Skin ◽  
Three Dimensional ◽  
Sweat Glands ◽  
Dorsal Skin ◽  
Human Finger ◽  
Finger Skin ◽  
Cut Surface ◽  
Palmar Skin

summary Resin casts of the fine vasculature of human digits in normal and some abnormal states were studied by scanning electron microscopy. The palmar skin contained terminal loops aligned with the finger-print, while the dorsal skin vasculature consisted of a coarse meshwork. Fine vessels in the nail bed had a parallel orientation as far as the lunula in adults, but were straight right up to the nail roots in young children. A deeper meshwork of capillaries (corresponding to the rete subpapillare and the rete cutaneum), vessels of the glomus bodies, and the dense meshwork of sweat glands were visible on the sagittal cut surface of the samples. A severely scarred index finger showed a coarse meshwork of surface capillaries. A skin-grafted index finger showed repaired terminal loops resembling normal skin in the area of grafted skin. The fine architecture of the digital vessels observed was discussed in terms of the physiology of blood circulation to the skin.

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