Wyniki wyszukiwania - Biblioteka Nauki

1

Use of Statistical Methods to Understand the Effect of Yarn and Fabric Parameters on Desizing Efficiency

100%

Teli M. D. , Chakrabarti R.

Fibres & Textiles in Eastern Europe

|

2008

|

tom Vol. 16, no. 2 (67)

95--100

EN

The control of fabric quality in terms of the basic structure, like yarn type, yarn count, twist multiplier, ends per inch and picks per inch, cover factor etc. is very important, as these parameters finally determine the quality aspects of the fabric during its interaction with the chemicals used in the process. In this work an attempt was made to investigate the influence of structural parameters of the yarn and fabric, like the yarn count, yarn twist multiplier and the p.p.i. on the final performance of desized, 100% cotton fabric. Desizing is the first stage of all the preparatory processes, wherein the size of the materials applied to the warp yarn during weaving is removed. This process determines the performance of the subsequent processes, such as the uniformity of scouring, bleaching, dyeing etc. which is quite crucial in maintaining the quality of the finished fabric.

PL

Kontrola jakości tkaniny, poprzez jej podstawowe cechy (tj. typ przędzy, masa liniowa i współczynnik skrętu przędzy, gęstość wątku i osnowy, współczynnik pokrycia, etc.) jest bardzo istotna, ponieważ powyższe parametry wpływają na jakość tkaniny podczas procesu odklejania. W pracy badano wpływ parametrów strukturalnych przędzy (masa liniowa, współczynnik skrętu przędzy, gęstość wątku) i tkaniny na efekt odklejenia tkaniny bawełnianej. Odklejanie jest pierwszym etapem procesu przygotowawczego, podczas odklejania usuwa się z tkaniny klejonkę naniesioną w procesie tkania. Proces ten wpływa na jednolitość procesu prania, bielenia, barwienia itd. i dość mocno decyduje o jakości wykończonej tkaniny.

2

Behavior based co-ordination of a troop of vehicles targeted to different goals in an unknown environment

80%

Sanyal S. , Barai R. K. , Chakrabarti R. , Chattopadhyay P. K.

Journal of Automation Mobile Robotics and Intelligent Systems

|

2012

|

tom Vol. 6, No. 4

20-26

EN

The issue of coordinated operation of multi-vehicle for a variety of tasks is getting increasing attention day by day and standing as a major research field due to their increased capacity and flexibility they can offer as a team. This paper presents a novel algorithm for multi-vehicle navigation, based on exhaustive search to avoid a set of randomly generated obstacles, predict the approximate position of other vehicles and thus keeping a safe distance to avoid collision and to maintain a formation amongst them while targeted towards the assigned goals. The proposed algorithm uses two optimizing functions in deriving drive commands, direction and turning, for a troop of vehicles. This particular algorithm is similar to the artificial potential field (APF) method which is widely used for autonomous mobile robot path planning due to its simplicity and mathematical elegance. In this work we have taken a behavior based reactive scheme together with artificially generated perturbation as the vehicles are running in a real time environment. Simulations have been carried out for a group of four vehicles, paired in two groups, approaching two different targets avoiding eight randomly generated obstacles, and keeping proper coordination between the members of intra and inter groups. The effectiveness of the proposed approach has been shown by some simulation results.

3

Effect of UV-B radiation on the defence system of Labeo rohita (Actinopterygii: Cypriniformes: Cyprinidae) larvae and its modulation by seed of devil’s horsewhip, Achyranthes aspera

80%

Singh M. K. , Sharma J. , Chakrabarti R.

Acta Ichthyologica et Piscatoria

|

2013

|

tom 43

|

nr 2

EN

Background. Ultraviolet (UV-B) radiation affects the immune system of fish. Dietary supplementation of natural immunostimulants may enhance the immunity of fish. The presently reported investigation evaluates the UV-B protective property of Achyranthes aspera seed in larvae of rohu, Labeo rohita (Hamilton, 1822). Materials and Methods. Larvae (1.19 ± 0.03 g) were fed four formulas of diet containing 0.0% (control), 0.1%, 0.5%, and 1.0% Achyranthes aspera seeds. After 51 days, larvae of each feeding treatment were divided into two groups. One groups was exposed to UV-B radiation (80 µW · cm–2) and the other one remained unexposed. Results. Average weight of fish was significantly (P < 0.05) higher in fish fed 0.5%-seed-supplemented diet (compared to other treatments). UV-B radiation affected the growth of fish fed 0.1%-seed-supplemented- and control diets; other two treatments remained unaffected. Total serum protein-, albumin-, and globulin levels were significantly (P < 0.05) higher in exposed fish compared to the unexposed ones. Among the exposed groups, serum glutamic oxaloacetic transaminase and serum glutamate pyruvate transaminase levels were minimum in fish fed 1.0%-seed-supplemented diet, whereas the highest levels of myeloperoxidase, hemagglutination titre, and white blood cells were found in fish fed 0.5%-seed-supplemented diet group. Conclusion. Dietary supplementation of A. aspera seed at 0.5% level enhanced the growth and immunity of UV-B exposed fish.

4

Dependence of yarn and fabric strength on the structural parameters

80%

Teli M. D. , Khare A. R. , Chakrabarti R.

Autex Research Journal

|

2008

|

tom Vol. 8, no. 3

63--67

EN

Strength of the fabric is an important property that decides and influences all other performance properties of the fabric. But though we all understand the importance of the strength of the fabric in daily wear, a systematic approach is required to correlate various strength properties with that of the yarn and fabric construction parameters. We are all aware of the effect of the individual factors like twist, count and cover factor on the strength behaviour of the fabric. However it is necessary to study the effect of all these parameters in combination with each other to ultimately influence the strength of the fabric. Such a study is also useful for designing of the fabric, depending upon the end use and the customer requirement as it is gaining importance in the recent fierce competitive scenario. In this study we have evaluated the strength properties of the fabric with respect to tensile, tear and bursting strength and correlated the results with respect to the yarn count, Twist Multiplier and picks per inch of the fabric using regression equations.