Textiles. Yarn from packages. Determination of linear density (mass per unit length) by the skein method

The main purpose of this study is to predict and develop a model for forecasting the Seam Strength (SS) of denim garments with respect to the thread linear density (tex) and Stitches Per Inch (SPI) by using a Fuzzy Logic Expert System (FLES). The seam strength is an important factor for the serviceability of any garments. As seams bound the fabric pieces together in a garment, the seams must have sufficient strength to execute this property even in the unexpected severe conditions where the garments are subjected to loads or any additional internal or external forces. Sewing thread linear density and number of stitches in a unit length of the seam are the two of the most important factors that affect the seam strength of any garments. But the relationship among these two specific variables and the seam strength is complex and non-linear. As a result, a fuzzy logic based model has been developed to demonstrate the relationship among these parameters and the developed model has been validated by the experimental trial. The coefficient of determination ( R2) was found to be 0.98. The mean relative error also lies withing acceptable limit. The results have suggested a very good performance of the model in the case of the prediction of the seam strength of the denim garments.

Determination of semimicroscopic linear density variations in porous materials by X-ray absorption measurements in the electron microprobe

Journal of Physics E Scientific Instruments ◽

10.1088/0022-3735/9/11/011 ◽

1976 ◽

Vol 9 (11) ◽

pp. 929-931

Author(s):

O Sorenson

Keyword(s):

Porous Materials ◽

Electron Microprobe ◽

Linear Density ◽

X Ray ◽

X Ray Absorption ◽

Absorption Measurements

A new current weigher, and a determination of the electromotive force of the normal weston cadmium cell

Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character ◽

10.1098/rspa.1907.0068 ◽

1907 ◽

Vol 80 (535) ◽

pp. 12-18

Keyword(s):

Current Sheet ◽

Electromotive Force ◽

Unit Length ◽

Screw Thread ◽

Late Professor ◽

Convenient Formula ◽

Association Meeting ◽

Helical Current ◽

Mutual Induction

The instrument described is the outcome of conversations between the late Professor J. Viriamu Jones, F. R. S., and one of the authors (W. E. A.), on their return from the British Association Meeting held in Toronto in 1897. Its object was to determine “ the ampere ” as defined in the C. G. S. system, to an accuracy comparable with that attained in the absolute determination of the ohm by Lorenz’s apparatus, an account of which was given by Professors Ayrton and Jones at the Toronto Meeting. Professor Jones had previously developed a convenient formula for calculating the electromagnetic force between a helical current and a coaxial current sheet, viz., F = γ h γ (M 2 -M 1 ),† where γ h is the current in the helix, the γ current per unit length of the current sheet, and M 1 , M 2 the coefficients of mutual induction of the helix and the two ends of the current sheet respectively. By using coaxial coils with single layers of wire wound in screw-thread grooves, advantage could be taken of the above formula.

VIBRATIONS ON POWER LINES IN A STEADY WIND: V. RESONANCE OF STRINGS WITH STRENGTHENED ENDS

Canadian Journal of Research ◽

10.1139/cjr38a-022 ◽

1938 ◽

Vol 16a (12) ◽

pp. 215-225

Author(s):

R. Ruedy

Keyword(s):

Total Mass ◽

Linear Density ◽

Unit Length ◽

Standing Waves ◽

Power Lines ◽

Resonance Frequencies ◽

The Law

The resonance frequencies, and in particular all the overtones of a string along which the linear density varies according to the law ρ(1 + λx/L)m, are slightly higher than the frequencies of a uniform string of the same total mass when the ratio between the mass of an element at the end and a corresponding element at the centre is varied between 1 and 25. In order to bring a string with strengthened ends into resonance it is necessary not only that the force acting on unit length of the string be of the same frequency as one of the resonance frequencies, and that its strength varies along the string in proportion to the amplitudes of the corresponding standing waves, but it must also be proportional to the mass of each element. It is therefore more difficult to produce true resonance in a string with strengthened ends than in a uniform string.