فهرست مطالب بهزاد رنجبر

Food safety is considered a serious challenge due to the increase in the world population and efforts to increase agricultural activities. Good agricultural practices are one of the recognized standards for achieving high-quality food safety. The purpose of this descriptive research was to analyze the effects of using information and communication resources on the implementation of Good Agriculture Practices (GAPs). The statistical population of the study was strawberry growers in Marivan and SarvAbad counties (N=241). The sample size was determined via the Krejcie and Morgan table (n=174). The sampling was carried out using proportional stratified random sampling process. The research instrument was a questionnaire. The face and content validity of the questionnaire was evaluated and verified by the panel of experts. The reliability of the questionnaire was confirmed by calculating Cronbach’s alpha and composite reliability (CR) coefficients. For data analysis, AMOS23 and SPSS23 software were employed. Research findings showed that oral (path coefficient: 0.30) and written (path coefficient: 0.28) resources had positive and significant effects on applying GAPs by strawberry growers; so that these resources could explain about 35% variance in the implementation of GAPs. Based on the results, it is suggested to consider the possibility of more use of information resources by strawberry growers by using face-to-face and applicable communication channels.

The rapid increase in global population and the industrialization of agricultural products have led to the destruction of natural resources and posed great challenges to the ecosystem. The purpose of this descriptive research was to identify the intention of strawberry growers in Marivan and SarvAbad counties to apply Good Agriculture Practices (GAP). The statistical population of the study was strawberry growers in Marivan and SarvAbad county (N=241). The sample size determined via the Krejcie and Morgan table (n=174). The sampling was based on a proportional stratified random sampling approach. The research instrument was a structured questionnaire. Face and content validities of the questionnaire evaluated and verified by a group of experts. The reliability of the questionnaire was confirmed by calculating the Cronbach’s alpha and composite reliability (CR) coefficients. For data analysis, AMOS23 and SPSS23 software were used. Descriptive results showed that the highest and lowest mean for the components of GAP behavior were assigned to the harvesting and packaging (3.60 out of 5) and the field condition and location (2.96 out of 5), respectively. It also should be emphasized that the means calculated for the variables attitude (3.76 out of 5), subjective norms (3.45 out of 5), perceived behavioral control (3.19 out of 5), and intention of applying GAP (3.66 out of 5) were greater than the average score. Research findings showed that attitude and perceived behavioral control had positive and significant effects on farmers' intention toward applying GAP. So that these variables could explain about 25% of variation in strawberry growers’ intention toward applying GAP.

The purpose of this descriptive research was to analyze effect of environmental beliefs on participatory behaviors of farmers toward water conservation. Statistical population of the study was farmer households in central region of the Zarivar watershed located at Marivan township (N=2097). Sample size determined via Cochran formula (n=237). The sampling method was proportional stratified random sampling. Face and content validity of the questionnaire revised and verified by a panel of experts. Convergent validity of questionnaire was obtained at the optimum level by calculating the average variance extracted (AVE) and composite reliability (CR). To determine the reliability of the questionnaire, a pilot test was conducted, and then Cronbach’s Alpha was calculated. For data analysis, AMOS and SPSS software were used. Descriptive results showed that the highest and lowest mean for components of general beliefs were assigned to the human interdependence (3.08 out of 5) and the human exception (1.78 out of 5) respectively. Also, means of farmers’ specific beliefs were calculated upper than average level (3.75 out of 5) and for farmers’ participatory behavior toward water, conservation was lower than the average level (2.51 out of 6). Research findings showed that general and specific beliefs of farmers had a positive and significant effect on their participatory behavior toward water conservation. So that these variables could explain about 0.29% variance of participatory water conservation behvaior.

Given the rapid changes in this century the agricultural education system, in addition to the educational and technical aspects, must assist students and other stakeholders in acquiring cultural and social skills and abilities. So, the purpose of this applied research was to analyze the effects of cultural capability on cultural capital among agricultural students at the University of Zanjan. This quantitative research in terms of data collection and analysis is a field study and in terms of the possibility and ability to control variables is causal-relational research. The statistical population of the study was 1023 people of agricultural students studying at the University of Zanjan (N=1023). The sample size determined via Krejcie and Morgan’s table (n=284). The sampling method was proportional stratified random sampling. The research instrument was a questionnaire. The face and content validity of the questionnaire was confirmed by a panel of agricultural extension and education experts. The reliability of the questionnaire was confirmed by calculating the ordinal theta between 0.74 to 0.94 and composite reliability between 0.72 to 0.97. SPSS software and structural equation modeling methods in AMOS software were used to process the data. The results of the structural model showed that according to the viewpoint of students, the cultural capability has a significant and positive effect on the cultural capital. Also, the cultural intelligence and skills of students have a positive and significant effect on cultural capital and the structural model analysis showed that cultural capability can explain 28% of students' cultural capital changes.

Concerns about the environment in general and water scarcity in particular have led to the implementation and development of policies aimed at changing the behavior of farmers in the field of water conservation. Many environmental problems are rooted in human behavior and can be solved by understanding human behavior. Thus, the purpose of this descriptive research was to analyze the effects of norms on participatory behaviors of farmers towards water conservation. Statistical population of the study was farm households in central region of Zarivar wetland watershed located in Marivan county (N=2097). Sample size determined using Cochran formula (n=237). Sampling method was multi-stages stratified sampling. Face and content validity of the questionnaire explored and verified by a panel of experts. The reliability of the questionnaire was confirmed by calculating Cronbach's alpha and composite reliability coefficients. For data analysis, AMOS and SPSS23 were used. Research findings showed that participatory norms, legal norms, and normative beliefs of farmers had significant positive effects on their participatory behavior towards water conservation. So that normative beliefs (ß= 0.60) and participatory norms (ß= 0.18) had the highest and lowest effects on farmers’ participatory behavior towards water conservation, respectively. These variables could account for about 47 percent of variance of the variable participatory water conservation behavior.

In this paper، the sound behavior of a double walled composite with an intermediate porous layer has been conducted using the classical laminated plate theory (CLPT). The main objective of the paper is devoted to considering the analytical study of various boundaries on porous layers as well as parameter study on power transmission through the structure. Thus، viscous and inertia coupling in a dynamic equation، as well as stress transfer، thermal and elastic coupling of porous material are considered based on Biot theory. In addition، the equation of wave propagation are extracted according to vibration equation of composite layers. Then، with applying the various boundaries on the structures along with solving these equations simultaneously، the Transmission Loss (TL) is calculated. The analytical results are compared with both numerical ones obtained from Statistical energy Analysis (SEA) as well as empirical results and an excellent agreement is observed. The parametric studies are presented to investigate the effects of boundary conditions on TL. The results indicate that the interface of porous-composite layers as well as stacking sequences of the composite layers would play an important role in reduction of power transmission through the structure.