Rengasamy R.S.,Indian Institute of Technology Delhi |
Samuel Wesley W.,NIFT
Autex Research Journal | Year: 2011
A dynamic sewing tension study was carried out with a tension probe on sewing threads with different structures, physical and tensile characteristics in a single needle lock stitch sewing machine. The needle thread recorded four major tension peaks corresponding to events occurring during sewing; bobbin thread withdrawal, stitch tightening, needle piercing the fabric and tightening of the needle thread around the shuttle, among which stitch tightening caused the maximum tension for all threads. Polyester filament and spun polyester threads exhibited the highest and lowest tightening tension, respectively. Multiple regression analysis showed that pre-tension and elastic modulus show positive influences while tex, bending, rigidity and compressibility of threads show negative effects on tension peaks during tightening and needle piercing. Sewing speed shows a positive impact only on the tension peak due to needle piercing. Pre-tension showed a prominent influence on tension peaks on all threads while the number of fabric layers failed to show any effect. © AUTEX.
Devi E.,Siksha O' Anusandhan University |
International Journal of Pharma and Bio Sciences | Year: 2012
Sleep is a basic drive of nature. Although many questions regarding the role of sleep remain unanswered, scientific studies have shown that sleep contributes significantly to several important cognitive, emotional and performance-related functions. Deprivation of sleep causes feelings of "sleepiness," decreased levels of alertness or concentration. Excessive sleepiness is also associated with reduced short-term memory and learning ability, negative mood, inconsistent performance, poor productivity and loss of some forms of behavioural control. The consequences of insufficient sleep among adolescents are particularly important to understand because they appear to be closelytied to key elements of human development. Achieving developmental goals during adolescence is essential for lifelong success and social competency. In addition, the transition from childhood to adulthood is a critical time for "seeding" the values and habits that will shape their lives. Therefore, understanding sleep patterns of adolescents is important so that possible strategies for intervention can be formulated.
Panghal D.,NIFT |
Kumar S.,Sardar Vallabhbhai National Institute of Technology, Surat
Key Engineering Materials | Year: 2013
This paper presents a low cost knowledge based system (KBS) framework for design of bending die. Considerations for development of KBS are discussed at some length. The proposed framework divides the task of development of expert system into different modules for major activities of bending die design. The procedure of development of KBS modules is also described at length. Production rules for each module are recommended to be coded in the AutoLISP language and designed to be loaded into the prompt area of AutoCAD or through user interface created using Visual Basic. Each module of the proposed framework is user interactive. Development of one module of the proposed framework is also described at length. This module is capable to assess manufacturability of bending sheet metal parts. An illustrative example is also included to demonstrate the usefulness of this module. The proposed system framework is flexible enough to accommodate new acquired knowledge. As the proposed system is implementable on a PC having AutoCAD software, therefore its low cost of implementation makes it affordable even by small scale sheet metal industries. © (2013) Trans Tech Publications.
Saxena A.,NIFT |
Anjaanee A.K.,NIFT |
Srivastava A.,Indian Institute of Technology Delhi
Asian Textile Journal | Year: 2010
Quantitative awareness of emissions of greenhouse gases such as carbon dioxide, methane and nitrous oxide from industrial activities have long been known to be major contributors to global warming in apparel industry. Energy consumed in a process is responsible for carbon dioxide and if one calculates all the energy consumed in different forms for manufacturing, same energy can be converted to carbon dioxide emission with the help of available calculators and one can calculate the carbon foot print for that particular unit. Carbon dioxide calculators generally work by accepting user inputs characteristic of individual behavior and by returning an amount of carbon dioxide emitted as a direct result of such behavior in the form of a user's carbon footprint. Average CFP or carbon dioxide emission on production floor for making 600 T-shirt = 635.6 lbs.