The cytotoxicities of chemicals used in household products were evaluated using a neutral red (NR) uptake assay. The chemicals tested during 1997-2004 were rubber additives (accelerators, antioxidants and retarders), solvents, plasticizers and biocides, such as antimicrobials, fungicides, preservatives used in paints, paper, wood and plastic products. The cytotoxicity potential of each chemical...

qualitative and quantitative analyses of hospital and municipal solid waste are necessary for selecting the best and most appropriate method of health care collection, storage, transportation and disposal of this kind of wastes. quantitative and qualitative analyses of hospital and municipal wastes have been studied in ahwaz city during spring 1996. the amount of solid wastes in five regions of...

We present a new haptic augmented reality system that modulates the perceived stiffness of a real object by changing the perceived material with vibratory subtraction and addition. Our system consists of a stick with a vibrotactile actuator and a pad with an elastic sheet. When a user taps the pad, the innate vibration resulting from the tapping is absorbed by the elastic surface. Simultaneousl...

The discoloration problem of rubber wood caused by the fungi has degradation and greatly reduced its economic value, prevention control have become top priority basic research on protection modification. To determine fungal community diversity dominant groups before after wood, nine samples were subjected to ITS sequencing using Illumina high-throughput technology. results showed that detected ...

Currently, the research on application of bamboo wood plastic fibers to 3D printing technology in Vietnam is limited. Almost all studies mainly focus natural polymers (wood, rubber, coir..) but ignore a rich polymer source, popular Vietnam: bamboo. In addition, quality applied has not responded requirements consumers. The durability printed parts that based high. Surface gloss after implementat...

We continue our survey of the spectra nitrogen containing polymers with a look at polyurethanes. Polyurethanes are widely made into foam rubber, elastic, and wood coatings, amongst other things. The polyurethanes similar to polyamides since both polymer types contain C=O N-H bonds. Therefore, we will begin review polyamides.