Wyniki wyszukiwania - Biblioteka Nauki

1

Determination of the technological value of cotton fibre: a comparative study of the traditional and multiple-criteria decision-making approaches

100%

Majumdar A. , Majumdar P. K. , Sarkar B.

Autex Research Journal

|

2005

|

tom Vol. 5, no. 2

71--80

EN

This paper presents a comparative study of the methods used to determine the technological value or overall quality of cotton fibre. Three existing methods, namely the fibre quality index (FQI), the spinning consistency index (SCI) and the premium-discount index (PDI) have been considered, and a new method has been proposed based on a multiple-criteria decision-making (MCDM) technique. The efficacy of these methods was determined by conducting a rank correlation analysis between the technological values of cotton and yarn strength. It was found that the rank correlation differs widely for the three existing methods. The proposed method of MCDM (multiplicative AHP) could enhance the correlation between the technological value of cotton and yarn strength.

2

Selecting cotton bales by spinning consistency index and micronaire using artifical neural networks

100%

Majumdar A. , Majumdar P. K. , Sarkar B.

Autex Research Journal

|

2004

|

tom Vol. 4, no. 1

1--8

EN

This paper presents a method of selecting cotton bales to meet the specified ring yarn properties using artificial neural networks. Five yarn properties and yarn count were used as inputs, whereas the Spinning Consistency Index (SCI) and micronaire were the outputs to the neural network models. Bales were selected according to the predicted combinations of SCI and micronaire. The properties of yarns spun from selected bales show good association with the target yarn properties.

3

An Investigation On Air and Thermal Transmission Through Knitted Fabric Structures Using the Taguchi Method

100%

Ghosh A. , Mal P. , Majumdar A. , Banerjee D.

Autex Research Journal

|

2017

|

tom Vol. 17, no. 2

152--163

EN

Knitted fabrics have excellent comfort properties because of their typical porous structure. Different comfort properties of knitted fabrics such as air permeability, thermal absorptivity, and thermal conductivity depend on the properties of raw material and knitting parameters. In this paper, an investigation was done to observe the effect of yarn count, loop length, knitting speed, and yarn input tension in the presence of two uncontrollable noise factors on selected comfort properties of single jersey and 1×1 rib knitted fabrics using the Taguchi experimental design. The results show that yarn count and loop length have significant influence on the thermo-physiological comfort properties of knitted fabrics.

4

Engineering of Knitted Cotton Fabrics for Optimum Comfort in a Hot Climate

100%

Mal P. , Ghosh A. , Majumdar A. , Banerjee D.

Fibres & Textiles in Eastern Europe

|

2016

|

tom Vol. 24, no. 2 (116)

102--106

EN

Cotton knitted fabrics are popular for summer-wear and outer-wear due to their comfort. The typical porous structure of knitted fabrics, however, increases the risk of exposure of human skin to UV rays, resulting in skin cancer. Therefore a trade-off is required between the comfort and UV ray resistance of the fabric. In this study, an attempt was made to engineer single jersey and 1×1 rib knitted fabrics with optimum comfort and desired UV resistance. It was found that 1×1 rib knitted fabrics could provide better comfort and UV protection with respect to single jersey fabrics manufactured on the same gauge knitting machine.

PL

Dzianiny bawełniane są bardzo popularne dla ubrań noszonych latem ze względu na możliwość uzyskania wysokiego komfortu noszenia. Typowa porowata struktura dzianin powoduje jednak wzrost ryzyka wystawienia skóry na promieniowanie UV mogące prowadzić do raka skóry. Dlatego należy uzyskać kompromis pomiędzy komfortem noszenia a odpornością na promieniowanie UV. W pracy przeprowadzono próbę opracowania dzianiny lewo-prawej i dwu-prawej 1x1 o optymalnych właściwościach komfortu i jednocześnie wymaganej odporności na promieniowanie UV. Stwierdzono, że dzianina dwu-prawa 1x1 może zapewnić lepszy komfort i ochronę przed UV w porównaniu do dzianiny lewo-prawej produkowanej przy tych samych parametrach maszyny dziewiarskiej.

5

Evidence for the invalidity of the Wingate test for the assessment of peak power, power decrement and muscular fatigue

51%

Robergs R. A. , Kennedy D. , Gibson A. L. , Zuhl M. , Hsu H.-S. , Beam J. , Salgado R. M. , White A. C. , Majumdar A. , Lawson S. , Estrada E. , Sierra G.

Central European Journal of Sport Sciences and Medicine

|

2015

|

tom 10

|

nr 2

EN

We hypothesized that the protocol-induced initial cadence of the WAnT is too high to allow high muscle force production and peak power generation. Twenty endurance, strength or power trained subjects (9 male, 11 female) completed two 30 s maximal exertion stationary cycle ergometer tests involving the traditional peak cadence start (TRAD) vs. a stationary start (STAT). Inertia corrected mechanical power, cadence, EMG from the vastus lateralis, and applied force to the pedals were measured continuously throughout both tests. Peak power was higher during TRAD; 11.32 ±1.41 vs. 10.40 ±1.35 Watts/kg (p < 0.0001), as was peak cadence; 171.4 ±16.3 vs. 120.9 ±15.1 rev/min (p < 0.0001). However, during TRAD EMG root mean squared (rms) increased continuously throughout the test, force applied to the pedals increased from 1 to 3 s (0.73 ±0.27 vs. 0.90 ±0.39 N/kg; p = 0.02) and thereafter remained relatively stable. EMG mean frequency also increased from 1 to 3 s, but then decreased throughout the remainder of the test. During TRAD, mechanical power decreased near immediately despite increasing EMG rms, EMGmean frequency and force application to the pedals. The initial 10 s of data from the WAnT is invalid. We recommend that intense cycle ergometer testing should commence with a stationary start.