polyamide 6 has been widely used in food packaging applications and also green tea contains amounts of antioxidant compounds. the aim of this study was investigation of green tea effects on properties of polyamide packaging polymer. polyamide 6 was dissolved in methanol which was saturated with calcium chloride. the active packaging film was produced by incorporation of methanol green tea extra...

polylactic acid based biodegradable nanocomposites reinforced with acetylated nanocellulose were fabricated with solution casting procedure. the nanocomposites were prepared by adding 1, 3 and 5% nanofiber loadings. the microstructure, physical, mechanical and thermal properties of the prepared nanocomposites were investigated. scanning electronic microscope (sem) analysis of the composites con...

In recent decades, porous asphalt has been extended for surface drainage in various regions throughout the world. The permeability of porous asphalt has an important role in the performance of asphalt pavements in the rainy weather. The most remarkable problem related to the porous asphalt is its short service time. Considerable efforts have been made to enhance the mechanical properties of por...

The passage of materials across a membrane consisting of cells, e.g., the cap& lary wall, requires a consideration of several structural tors. Environmental effects may be mediated through the exertion of may be purely nt of material passed through in a permeability characteristics of the and environmental f acchemical action on the structure of pressure on the membrane the membrane. or they ma...

To investigate the anisotropy of coal swelling, this study proposes an effective stress model for saturated, adsorptive fractured porous media by considering gas adsorption induced surface change on solid-fluid interface. The can be used to capture anisotropic swelling combining mechanical properties and link with permeability. Direction dependent fracture compressibility is describe evolution ...

[1] We explore the permeability evolution of fractures in carbonate rock that results from the effects of mechanical stress and nonequilibrium chemistry (pH of fluid). Core plugs of Capitan limestone are saw cut to form a smooth axial fracture that is subsequently roughened to simulate a natural fracture with controlled surface topography. Aqueous solutions of ammonium chloride (pH 5 7) transit...

BACKGROUND Most dental implant systems are presently made of two pieces: the implant itself and the abutment. The connection tightness between those two pieces is a key point to prevent bacterial proliferation, tissue inflammation and bone loss. The leak has been previously estimated by microbial, color tracer and endotoxin percolation. METHODS A new nitrogen flow technique was developed for ...

The purpose of the study was to evaluate the effects of maximal exercise on the integrity of the alveolar epithelial membrane using the clearance rate of aerosolized 99mTc-labeled diethylenetriaminepentaacetic acid as an index for the permeability of the lung blood-gas barrier. Ten elite rowers (24.3 +/- 4.6 yr of age) completed two 20-min pulmonary clearance measurements immediately after and ...

There are increasing research endeavours on the application of nanotechnology in construction industry and lightweight composites. In this study, influence different percentage (1%, 2%, 3% by weight cement) colloidal nano-silica particles mechanical, thermal, durability properties cementitious composites was studied through measurement compressive strength, flexural response, micro-hardness mea...

Geological storage of CO2 in saline aquifers and depleted oil gas reservoirs can help mitigate emissions. However, leakage over a long period represents potential concern. Therefore, it is critical to establish good understanding the interactions between CO2–brine cement–caprock/reservoir rock ascertain for leakage. Accordingly, this work, we prepared unique set composite samples resemble cemen...