Sharif Digital Repository

In the world today, biological materials widely used are which requires proper packaging, the types of enzymes are used in various industries: food, pharmaceutical, cosmetics. Shelf Life of enzymes Limited and affected by internal and external factors a maximum of one year. Internal factors include water activity, pH, microbial flora, oxidation-reduction potential, chemistry and biochemistry products, product formulation, additives and the reaction with package. External factors such as relative humidity, light, gas atmosphere within the package, the storage conditions and temperature. Water activity and relative humidity are important factors in spoilage. Avoid drying, lipid reaction,... 

Recently, due to the increase of environmental concerns, a significant raise in applying films and packaging containers, pollution produced from petroleum-based plastics packaging and problems arising from the various methods of waste disposal, the researchers have concentrate to replace these materials with biodegradable ones. In this study, a nanocomposite based on alloy matrix of thermoplastic starch and polyethylene which is reinforced with different amounts of Montmorillonitenanoclay has been constructed by the extrusion process. Furthermore, in order to increase the compatibility between the polar and non-polar components in the group of samples, compatibilizer was used and its... 

The fast development of semiconductor industry has moved the design methodology to SoC (System on Chip) design. Due to the increasing number of processing elements, In SoC, buses become the bottleneck of the system and lead to non-efficient designs. NoC (Network onChip) is an efficient solution that eliminates bus bottleneck and it had been introduced as a suitable substructure for interconnecting processing elements. The NoCs were originally built based on Interconnection Networks.They have been proposed as an efficient, scalable, modular and reliable solution to provide on chip communication in any large SoC design. The trend of market to mobile digital systems and battery-powered devices,... 

In this research, a polyethylene / thermoplastic film containing ethylene adsorbent nanostructure was fabricated to package agricultural products and increase the shelf life of fruits and vegetables. The thermoplastic starch containing 60 wt% starch and 40 wt% plasticizers with weight ratios of 5: 1, 4: 1, and 3: 1 sorbitol to glycerol was added to the polyethylene film to determine the composition of the final film. The film was prepared by a combination of low-density polyethylene with 10wt % linear low-density polyethylene, 30 wt% thermoplastic starch (4: 1 sorbitol to glycerol ratio), and 3wt% PE-g-MA as compatibilizer. Then, halloysite nanotubes were added to the film as ethylene... 

The integration of pricing and production planning decisions has attracted many researchers and industry professionals, as these decisions directly affect the highest and lowest levels of a company. In this thesis, an integrated production-price problem for two complementary products is studied. Regarding the negative correlation of the two products, different sales strategies, including unbundling, pure bundling and mixed bundling, are used and three distinct models are proposed for each one. In the models, real and important assumptions such as production capacity limitation, shared resources, and the cost of preparation are considered. The goal of solving these models is to determine the...