فهرست مطالب faezipour

Today, the development of industrial clusters is considered as one of the successful approaches to industrial development. The cluster development approach, if developed in conjunction with the development of appropriate strategic plans, will not only promote specific industrial development but also regional development. Due to the fact that the furniture industry in Iran is mainly composed of small and medium enterprises, cluster development can be used to develop it. This study aimed to prioritize the furniture industry products for eight known furniture clusters in Iran. In the first stage, criteria and sub-criteria of ANP model were identified, and then the decision model was prepared based on ANP in the Superdecitions software. After weighing the criteria and the sub-criteria, we used the results of the questionnaire to determine the weight of the alternatives for each cluster separately. The results showed that in the furniture clusters of Tehran and Islamabad city, the option of decorative projects is about 0/35 and 334/0, respectively. In furniture clusters of Shandiz, Babolsar, Tabriz and Rudsar, the furniture and office furniture options with the weights of 271/0, 287/0, 284/0 and 293/0 were the first priority, respectively, and in furniture clusters of Qom and Malayer classic furniture with a weight of 0/32 and 0/304 respectively. The prioritized results showed that each of the studied clusters has more competitive ability to produce which products. . The prioritized results showed that each of the studied clusters has more competitive ability to produce

The aim of this study was to explore the minimum amount of urea formaldehyde (UF) resin content and optimum particleboard density while maintaining boards’ quality to reduce production costs. Board density at three levels (520, 620 and 720 kg m-3) and resin content (6, 7 and 8%) were variable parameters. Stepwise multivariate linear regression models were used to evaluate the influence of board density and resin content on board properties and to determine the most effective parameter. In order to obtain the optimum board density and minimum resin content, contour plots were drawn. Regression models indicated that both board density and resin content were included in Modulus of Rupture (MOR) and Modulus of Elasticity (MOE) models based on the degree of their importance. Internal Bond (IB) model only had one step and resin content positively affected it. The results obtained from contour plots revealed that manufacturing poplar particleboards with density ranging from 600 to 650 kg m-3 and 6% resin would result in boards with mechanical properties within those required by the corresponding standard. Thickness swelling (TS) values were slightly higher (poorer) than the requirements. The panels required additional treatments such as using adequate amount of water resistant materials to improve thickness swelling after 2 and 24 hours of immersion.

The effect of nano SiO2 and silane coupling agents on practical properties of plywood was investigated. After plywood production with layers of hornbeam wood (Carpinus betulus), physical and mechanical properties were analyzed. Variables were the type of silane coupling agent (vinyl tri methoxy silane and γ-amino propyl tri ethoxy silane), the amount of nano SiO2 (1% and 2%) and the amount of silane coupling agent (1% and 2%). The lowest water absorption and thickness swelling were observed in the case of boards produced with 1% treated nano SiO2 by 2% vinyl tri methoxy silane, and those with 1% treated nano SiO2 by 2% γ-amino propyl tri ethoxy silane had the highest bending strength and modulus of elasticity. The highest shear strength was found for the boards produced with 2% nano SiO2 treated by 1% vinyl tri methoxy silane. The results of this study revealed that utilization of nano SiO2 treated by silane coupling agent as filler for urea formaldehyde resin is effective in improving the physical and mechanical properties of plywood.

This paper presents an optimum framework for MDF industry location selection in Mazandaran Province. Each type of industrial activity should be assessed according to the existing potential in each province، otherwise undesirable results such as environmental pollution، increase of some costs of production and unfavorable uses of some sources may result in. Furthermore، some provinces and regions may have priority over other regions owing to primary facilities and infrastructures for creating a special industry. Possessing raw lignocellulose materials needed for establishing wood and paper industrial plants، Mazandaran province has priority over other provinces which lack these resources. Increases in exports mandates new industrial units establishment. For industrial development that results in better recognition of capability of different regions، a useful method for location selection should be used before establishing industrial units. This model uses AHP benefit/cost ratios method and the best alternative is the eastern part of Mazandaran.

Particle size, board density and adhesive content are the most important factors, influencing on physical and mechanical properties of particleboard. In this study the effects of density, adhesive content and particle size on withdrawal strength of particleboard made from Populus (Populus alba) particles have been studied. Three levels of density including 0.65, 0.7, and 0.75 g/cm3, three levels of adhesive content including 8, 9.5, and 11% and four levels of particles size including +5, -5 +8, -8 +12, and -12 mesh were used Moisture content of cake, press time, press temperature, press pressure were 12%, 5 min, 180 oC, and 35 kg/cm2 respectively. The results showed that particle size increased screw withdrawal resistance more than board density and adhesive percent, so there was a possibility to increase screw withdrawal resistance without increasing board density and adhesive percent. The highest withdrawal strength was obtained in particle board with density 0.75 g/cm3, adhesive content 11% and particle size +5 mesh.

In this study، effects of paraffin addition and pressing conditions on properties and surface roughness of medium density fiberboard have been studied. Variables including paraffin content at 0، 1and 2 percent، press temperature at 170° and 180° C and pressing time of 4 and 5 minutes were investigated. Modulus of rupture (MOR)، modulus of elasticity (MOE)، shear strength، surface roughness، water absorption and thickness swelling after 2 and 24 hours soaking in water were measured. The results indicated that paraffin addition had no significant effect on MOR، MOE، shear strength & surface roughness in MDF panels. In case of physical properties، adding paraffin generally caused decreasing water absorption and thickness swelling. Press temperature had significant influence on water absorption of MDF but no significant effect on other properties. Increasing press time resulted in a decrease in water absorption of MDF but it had no significant influence on other properties.

Pain due to cancer is one of the major problems of patients affected by malignancies. There are many methods for management of cancer pain and opioid consumption is the most important method. Fentanyl is a synthetic opioid which is represented as a transdermal patch used for chronic cancer pain relief. In this study we evaluated the effectiveness of transdermal fentanyl patch as compared to placebo in cancer pain. Patients and This study was designed and performed as a double blind randomized clinical trial. Patients affected by soft tissue tumors with chronic pain who had referred to Cancer institute of Imam Khomini Hospital during 2006-07 were included and divided randomly into transdermal fentanyl patch and placebo groups. The appearance of the patches in both groups was the same. Pain severity was measured with Visual Analogue Scale(VAS) 24, 48 and 72 hours after the initiation of treatment. Data analysis was done by SPSS V. 13 software.Quantitative data were shown with mean(SD) and qualitative data were presented with frequency. Chi- square and t-tests were used for comparison of the data between the two groups.Repeated measurement analysis of variance was used for evaluating the effect of time and its relation with the medicine. p<0.05 was considerd as statistically significant. A sum of 166 patients affected by cancer were divided in two groups –transderamal group(86 patient) and placebo group(80 patients).There was the same age and sex distribution in both the groups. According to repeated measurement analysis, the pain severity was significantly reduced in the transdermal fentanyl group as compared to the placebo group(p=0.07). The incidence of side effects was observed in 62 patients (72%) in fentanyl patch group and 31 patients (39%) in placebo group emphasizing the fact that the side effects were significantly more in the transdermal fentanyl patch group as compared to the placebo group (p=0.001) The data suggest that transdermal fentanyl patch is an effective and safe method in reducing pain in patients affected by soft tissue tumors.Also it can improve the quality of life in this group of patients.

In this study, the effect of immersion temperature on the short-term water uptake behavior of lignocellulosic fillers- HDPE Composites were investigated and then compared with the wood based commercial panels. panels of wood plastic composites (WPCs) were manufactured from different lignocellulosic materials of wood sawdust, rice hull flour and sawdust of particleboard (as filler) and powder of high density polyethylene( as polymer) at 60% by weight filler loading with constant temperature and pressure using a dry blend/hot press method. The nominal density and dimensions of the panels were 1g/cm3 and 35×35×1 cm, respectively. Specimens of the panels of wood plastic composites, medium density fiberboard and particleboard were immersed in distilled water at 20, 40 and 60ºC to measuring water absorption and thickness swelling after 2 and 24 hours immersion. The results showed that by increasing the immersion temperature, the water absorption and thickness swelling increased. So the water absorption and thickness swelling were affected exponentially by immersion temperature. Maximum values of water absorption and thickness swelling at various temperatures showed in particleboard and minimum values showed in HDPE/rice hull flour plastic composites.

In the today's world, along with the development of globalization and increasing competition in the production and selling of different products, producers succeed to have a better turn over. One of the methods of surveying the operations of a mill is to estimate and measure its productivity which deals with the institute use of the production factors. In this study, the total factor productivity (TFP) and partial productivity of the Nekachoub plywood mill in a period of seven years, from 1375 to 1381, were determined by the index, and estimation methods and their process of changes. Then the relationship between the total factor productivity (as the most important estimated productivity) and the partial productivity and production factors were analyzed by the correlation coefficient and regression tests in order to determine the effective factors on the total factor productivity of this mill and specify the causes of reduction and increase of its total productivity index. The total productivity in 1375 with the value of about 1.49 was the maximum, and in 1377 with the value of about 0.53 was the minimum. In addition, the effective factors on the total factor productivity of this mill were the log productivity, output value, value added, and the labourer's productivity respectively.

In this investigation, the effect of paraffin content and press time and temperature on practical properties especially surface roughness of particleboard is studied. The variables such as paraffin content at 0, 1& 2 percent, press temperature at 170° and 180° C and press time of 4 and 5 minutes were investigated. Modulus of rupture, modulus of elasticity, shear strength, water absorption and thickness swelling after 2& 24 hours soaking in water & surface roughness were measured.The results indicate that there is no significant difference on the influence of paraffin content on either MOR & MOE of the particleboard. But increasing paraffin content decreased shear strength of panels.However, addition of paraffin reduced water absorption and thickness swelling.Press temperature had no significant influence on measured properties, but this variables increased surface roughness. Increasing press time, improved MOE, but showed no significant influence on other properties.