Amir Hematian

• PhD
• PhD graduated at University of Tabriz

Solar thermal is the primary source of heat and the heat pump is used as a back-up when sun is not shining with enough intensity. In this paper, theoretical and experimental studies were carried out on a solar-assisted heat pump (SAHP) under the metrological condition of Tabriz city (located in the northwest of Iran). The system mainly includes a f...

Population growth and world climate changes are putting high pressure on agri-food production systems. Exacerbating use of energy sources and expanding the environmental damaging symptoms are the results of these difficult situations. This study was conducted to determine the energy balance for saffron production cycle and investigate the correspon...

Solar energy is an inexpensive source of energy for most of the countries. Use of this source of energy can be spread with the increase of solar systems efficiency. Solar energy collectors are the devices employed to gain useful heat energy from incident solar radiation. In the present investigation, an air solar flat plate collector was developed...

Solar energy is an inexpensive source of energy for most of the countries. Use of this source of energy can be spread with the increase of solar systems efficiency. Solar energy collectors are the devices employed to gain useful heat energy from incident solar radiation. In the present investigation, an air solar flat plate collector was developed...

Potatoes (Solanum tuberosum L.) are among the foremost vital international food crops. In this study cross-sectional data were collected from potato growers by employing a face to face survey in East-Azerbaijan Province of Iran. The data collected was analyzed for the energy, GHG emissions and economics of potato production. According to the result...

Potatoes (Solanum tuberosum L.) are among the foremost vital international food crops. In this study cross-sectional data were collected from potato growers by employing a face to face survey in East-Azerbaijan Province of Iran. The data collected was analyzed for the energy, GHG emissions and economics of potato production. According to the result...

This paper examines the energy use patterns and relationship between energy input and yield for broiler production in Fouman city of Guilan province. Data from 30 farmers were collected using a face-to face questionnaire method. In the surveyed broiler farms, average yield, manure and energy consumption were calculated about 2752 kg 1000 bird-1, 23...

Efficient use of energy in agriculture is one of the conditions for sustainable production. In the present study, energy pattern used for canola production in Iran was investigated and an ANN method was applied for predicting output energy in Kermanshah province of Iran. Data was collected using questionnaires and face-to-face interviews with 68 fa...

In this paper, a picking mechanism for fruit harvesting was designed and results of field experiments are reported. A prototype model was designed for both efficiency and cost effectiveness. Experimental results showed the proposed mechanism yielded a good accuracy; where a total of 210 fruits are used for evaluating the device, 200 of them were gr...

It is a well-known fact that solar resource or solar radiation varies spatially as well as temporally across the face of the earth. Hence, resource assessment is a preliminary step for all solar applications. In this study, a flat plate surface solar collector of dimension 2 m2, hinged on a horizontal support for quick adjustment of inclination fro...

Precision farming is a data-based management and a way of agricultural production, which takes into account the in-field variability. Precision agricultural technologies, such as Global Positioning Systems, Geographic Information Systems, remote sensing, yield monitors, mapping, and guidance systems for variable rate application, made it possible t...

The cucumber (Cucumis sativus) is a widely cultivated plant in the gourd family Cucurbitaceae. Total land area under cucumber production in Iran is about 82896 hectares, which produces 1603721.76 tons of cucumber. Kermanshah is important cucumber producing in Iran. Energy use in agricultural production has become more intensive due to the use of fo...

Energy management is one of the crucial issues in agricultural mechanization. The purposes of this study were to determine energy consumption of input and output used in sugar beet production, and to make it optimized by Genetic Algorithm in Kermanshah, Iran. Data were collected from 55 sugar beet farms in Kermanshah, Iran by using a face-to-face q...

Energy use efficiency in the wheat production as one of the key indicators for developing more sustainable agricultural, was studied by analysis of energy flow in this crop in Kermanshah province of Iran in 2012. Data was collected using questionnaires and face to face interviews with 70 farmers. Total inputs and outputs of wheat systems were calcu...

In the present study, a flat plate solar air collector is used for research purposes. The absorber of solar collector made by steel plate with an area of 2×1m 2 and thickness of 0.5mm in the form of window shade has been developed for increasing the air contact area. The surface of absorbent plate was covered by black paint. To insulate the collect...

The aim of this study was conducted to essay energy use efficiency in the maize production systems in Kermanshah province of Iran in summer 2010. For this study data was collected using questionnaires and face to face interview with 72 farmers. Results showed that the average application of N and P were 300 and 250 Kg/ha, respectively. Total inputs...

In the present study, a flat plate solar air collector is used for research purposes. The absorber of solar collector made by steel plate with an area of 2×1m 2 and thickness of 0.5mm in the form of window shade has been developed for increasing the air contact area. The surface of absorbent plate was covered by black paint. To insulate the collect...

The aims of this study were to investigate influences of energy inputs and energy forms on output levels and evaluation of inputs sensitivity for maize production in Kermanshah province, Iran. The sensitivity of energy inputs was estimated using the marginal physical productivity (MPP) method and partial regression coefficients on maize yield. Data...

Solar energy is one of the renewable energy sources which can be received more by designing more accurate systems. In this article a flat solar collector with the area of 2×1 m 2 and thickness of 0.5 mm, made of steel iron in the form of venetian blinds (in order to increase exposure to air) has been used. The surface of absorber plate was black an...

Ovine pulmonary adenocarcinoma (OPA) was studied in the lungs of 15 naturally-affected sheep (9 with classical and 6 atypical lesions) by transmission electron microscopy. Two lung samples from normal sheep were used to develop the ultrastructural criteria. Pathologic lesions consisted of focal-multifocal to coalescent nodules or masses in the cran...