Volume 19 Issue 3

Some physical and mechanical properties of laminated timbers used in wooden construction and furniture industry were examined. Polyurethane (PU) glue was used in the production of laminates with 5 layers. The surface layers in each laminated timber (Glulam) were from the same wood type, and the core layers were from willow wood. The laminated timbers whose outer layers were made of willow (Salix alba L.), yellow pine (Pinus sylvestris L.), and ash (Fraxinus L.) wood had an air-dry density value of 0.60 g/cm³ in laminated timber with the highest ash wood surface. The pressure resistance parallel to the fibers was determined in the surface layer ash wood with 48.6 N/mm². It was found that the static bending resistance was 91.1 N/mm² in laminated timber with a surface layer of ash wood, and the modulus of elasticity value in bending was 10040 N/mm² in laminated timber with the highest ash wood surface. Thus, it has been seen in the study that improvements in physical and mechanical properties were achieved, especially as a result of combining willow wood (having fast growth potential and low density) with high-density wood types. According to the results of the study, it is recommended to carry out the necessary studies to increase the physical and mechanical properties of low-density wood types by laminating them with high-density wood types.

One of the biggest problems that threaten the production of strawberry in the world is the rapid damage and high rate of deterioration after harvest or during cold storage. Therefore, the current study was conducted to investigate the possibility of decreasing the post-harvest damage percentages and increasing the fruit quality of Fragaria x ananassa cv. ‘Estavana’ after harvest immediately or during the cold storage period. The strawberry plants were dipped for 3 to 5 minutes at 25 °C in a solution of 10 L made from distilled water and containing salicylic acid (SA) at 0, 250, 500, and 1000 mg/L or chitosan (CHIT) at 0, 2.5, 5, and 10 mg/L during the period of 0, 3, 6, 9, 12, and 16 days after harvesting. The results showed that the fruit firmness was notably decreased, and the loss and decay percentages were increased by increasing the period of storage, but it could be decreased by using SA or CHIT. Fruit content from soluble solids, total sugars and anthocyanin was significantly increased in the 16 days stored fruits treated with 500 mg/L SA or 50mg/L CHIT. Treating the fresh harvested without or with SA or CHIT increased the fruit content from vitamin C. The highest fruit content from titratable acidity was in the fresh harvested fruits compared with treated fruits with SA or CHIT.

To cope with low fertility rate and an aging population, China introduced and implemented a two-child policy to make an overall population adjustment. Because of this, there are now problems, such as the uncoordinated sleep space for the two children, competition between older children, insufficient care for older children, and additional family affairs. In view of this, this study focused on the two-child family and parents as the main users of wooden infant beds. The method of constructing I-Kano model was used to determine the needs of users and their importance. Based on the QFD theory, the user needs and engineering measures were analyzed and explored. Based on the TRIZ theory, the analysis of engineering conflict resolution was performed. Based on the results, the wooden infant bed design strategy was developed for the background of two-child policy. The purpose of this work is to meet the parenting needs of two-child families in various periods with the developed design strategy, avoid the parenting problems of two-child families, improve the parenting quality of two-child families, adjust the sleeping space of two-child families, and fill the vacancy in the design theory of wooden baby beds for two-child families.