In this study, particleboard was produced by eucalypt and poplar wood mixture. Variations were as follow: -Combinations of  Eucalyptus and Poplar wood were (%100, %0), (%66.5, %33.5), (%33.5, %66.5) and (%0, %100) respectively. -Resin content (%8 and %10) Physical and mechanical properties of boards such as MOR, MOE, IB, TS2 and TS24 were examined according to EN standard. The effects of various raw materials combinations on bending properties were significantly different. Maximum of MOE and MOR were observed in %66.5 of Poplar wood and %33.5 of Eucalyptus wood. As expected, Physical and mechanical properties of boards were improved by increasing of resin content. Results indicated that TS2 and TS24 were increased with increasing of Poplar wood in combinations. Also the lowest amounts of these properties were obtained in eucalyptus and poplar wood mixture of %100 and %0 respectively.

The changes in mechanical, rheological and thermal properties of NR/BR blends (60/40) after aging at different period of time were investigated. The prepared rubber blends were conditioned at a temperature of 23±2oC for up to 140 h in an aging box. The TG-DTG curves demonstrated two significant factors, DTmax (differences between maximum peak temperature of BR blend aged for 140 h with maximum peak temperature of BR blends aged for 27, 51, 75, 99 and 123 h) and peak height ratio (hNR/hBR). The correlation between rheological (TS2, TC90), mechanical (strain, modulus 100% and modulus 300%), and thermal parameters (DTmax, hNR/hBR) with aging time of NR/BR blends were studied. Parameters such as TC90, modulus 100%, modulus 300% and hNR/hBR showed a correlation with time of aging. Whereas, no significant correlation between TS2, strain and DTmax were found as the time of aging increased.

Metallo-b-lactamases (MbL) are catalyzing the hydrolytic cleavage of the four-membered b-lactam ring in broad spectrum of antibiotics and therefore inactivating the drug. Electronic structure and electronic energy of metallo-b-lactamase active center, two inhibitors of this enzyme including penicillin and cephalexin, and different complexes between these inhibitors and active center of metallo-b-lactamase have been investigated. For both substrates (S), the nucleophilic attack of the amide group substrate to model of active site dinuclear zinc (E) formed an ES reactive complex that by passing through the first transition state (TS1), first intermediate (INT1), the second intermediate (INT2) and second transition state (TS2) converted to the product. Also, all thermodynamic functions, DHº DSº and DGº are calculated at 25 °C and 1 atm, in order to form two transition states, TS1 and TS2, and also for the total reaction of two MbL inhibitors. In all calculations, solvent effects have been considered in water using PCM method.

In order to survey of possibility of particle board production with «Acacia salicina » the effectiveness of three factor (treatment) included adhesive percentage (in two surface: %9 and %11) temperature degree (in two surface 165oc and 175oc) pressing time (in three surface: 5.6 and 7 minutes) on mechanical (MOR, MOE, IB) and physical (TS2, TS24) properties were experimented with E.N standard. Therefore 36 boards were prepared for mechanical and physical tests. Data were analyzed with appropriated statistical method. Results indicate %11 adhesive, 165oc temperature degrees and 6 minutes press time is best condition for production. However the results showed more than standard IB (1.24 Mpa) probably due to its wood chemistry. Therefore this species could be a suitable source to produce particle board.

Different factors influence on the properties of wood composite panels. Evaluating all of these factors not only increases waste of time and energy but also decreases accuracy in estimation of influence value of selected factors in manufacturing panels in order to obtain optimum point of different properties of wood composite panels. Hence, application of a new statistical method is necessary for determination of model estimating production´s optimum point. This study was aimed to evaluate the artificial neural networks performance to model the physical properties of the particleboard made of canola stalks particles. The physical properties of the particleboard were modeled and estimated using different weight ratios of melamine formaldehyde to urea formaldehyde, canola stalks to poplar particles and mat moisture content through MLP, RBFN and ANFIS artificial neural networks. The results showed that MLP neural network has better performance than RBFN and ANFIS neural networks to estimate the physical properties of the particleboard. The results also showed that the artificial intelligence models have a proper precision and ability to predict the particleboard's physical properties. The results of the sensitivity analysis also showed that for estimating TS2 and WA24, the most important parameter was mat moisture content with a positive effect on the modeling, and melamine formaldehyde to urea formaldehyde ratio was also the most effective parameter for estimating TS24 and WA2.

In this investigation Eucalyptus camaldulensis wood for particle -board production and determinating physical and mechanical properties of boards have been studied. Variable factors such as resin content in three levels (9, 10 and 11 percent) and press time in three levels (5, 6 and 7 minutes) were investigated.Other factors such as resin type, hardner type, closing press time, mat moisture, board density and etc. were assumed constant. Three boards were produced for each combination of variables. Based on the DIN-68763 standard physical and mechanical properties including Modulus of Rupture (MGR), Modulus of Elastisity (MOE), Internal Bonding (IB) and thickness swelling (TS2 and TS24) after 2 and 24 hours immersion in water were tested.Based on the factorial experimental design at completely random block test data was analysis. The rcsuHs showed that polymerization of resin could be better at the amount of 11 percent resin content and 7 minutes of press time for partideboard production from Eucalyptus camaldulensis wood.

The cure properties of some conventional accelerator/sulphur compounds of styrene-butadiene rubber (SBR) with a sulphur to accelerator ratio of ~1.8, containing no filler, and 10, 30, or 50 pphr rubber by weight precipitated amorphous white silica filler type VN3 were studied at 160°C by an oscillating disc rheometer curemeter. The optimum cure time, t95, of the compounds was lengthened substantially from 20 to 280 min when silica loading was raised to 50 pphr. The rate of cure calculated from the cure rate index, decreased sharply from 8.3 to 0.37 min–1 when the amount of silica in the mixes reached 50 pphr. Interestingly, the scorch time, ts2, of the compounds was not affected by the addition and increases in the amount of silica, and remained at about 8 min, although, there was some evidence that silica had interfered with the reaction mechanism of sulphur cure and reduced the extent of cure in the rubbers. Our results indicated that the compounds were fully cured when sufficient time i.e., up to 300 min for the mix with 50 pphr filler, was allowed for the reaction in the compounds at elevated temperature to complete.