A. Rajabipour

• PhD
• Professor (Full) at University of Tehran

Introduction: The use of remote sensing, due to the provision of timely data and the high capability of image analysis, as well as the possibility of studying in a wide range with acceptable accuracy, is of great help to the planners and implementers of the agricultural sector. Remote sensing is one of the effective tools for monitoring, studying a...

Introduction: The main reasons for the low productivity in agricultural production are the inappropriate allocation of resources and production factors. Although farmers have different options for agricultural activities and crop selection, their production factors are limited. By formulating and implementing an optimal cropping pattern in a region...

Determination of suitable land for cultivating different crops is an essential action for increasing agricultural productivity. The present research is carried out to zone suitable lands for cultivating rice, wheat, and barley by integrating intelligent methods and spatial data in the Silakhor plane of Iran. Machine learning methods, including arti...

Determination of suitable land for cultivating different crops is an essential action for increasing agricultural productivity. The present research is carried out to zone suitable lands for cultivating rice, wheat, and barley by integrating intelligent methods and spatial data in the Silakhor plane of Iran. Machine learning methods, including arti...

Timely and rapid monitoring of apple trees nutrition status is vital for accurate management of nutrient fertilizers in order to improve the yield and quality, as well as to reduce the risk of environmental degradation. As a most frequently used method, tissue analysis used to assess the nutritional status of apple tree leaves is laborious, costly,...

Purpose: In some orchards in the harvest season, the pomegranates are suspected to carob moth infestation. Visible infested fruits are removed but there is a possibility of hidden infestation. The effect of microwave heating on this hidden infestation was investigated in this study. Research Method: The mature pomegranate fruits were artificially i...

Although freshwater is necessary for the well-being of humankind, increasing population growth and limited resources lead to a serious crisis to supply freshwater. Since the Earth is surrounded by seawater, desalination based on electrical power is introduced as a promising technology to provide freshwater. It is well documented that the connection...

An integrated system including solid oxide fuel cell (SOFC)-gas turbine power plant and further combine this two equipment with electrochemical conversion of carbon dioxide (CO2) to ethanol is presented and analyzed. In this operation, heat, power and ethanol (as a fuel) are produced. Analyses of energy and exergy achieved along with cells potentia...

People in the Middle East are facing the problem of freshwater shortages. This problem is more intense for a remote region, which has no access to the power grid. The use of seawater desalination technology integrated with the generated energy unit by renewable energy sources could help overcome this problem. In this study, we refer a seawater reve...

Improving the environmental impact is a critical factor in achieving sustainable development in agricultural systems. To achieve this goal, the environmental assessment of agricultural products to identify environmental hot-spots and provide strategies for reducing them is essential. In line with that, the current study is performed to assess the e...

The selection of cropping patterns is one of the main factors in increasing agricultural productivity. Optimal allocation of land and determination of suitable crop production in each region to prevent unwarranted consumption of inputs and reduce the disaster of lack of food supply after scientific study of factors affecting cropping pattern and ta...

Rough rice is one of the most important agricultural products and it plays an important role in ensuring food security. The objective of this study was to investigate the effect of high power ultrasound in tempering duration on the drying kinetics of rough rice in a combined far-infrared radiation (FIR) dryer. Tests were conducted in a factorial de...

In this study, image processing and artificial neural networks (ANNs) are combined to predict quality and shelf-life of cauliflower packaged with modified atmosphere packaging (MAP). The advantageous of using MAP with a gas mixture (92% N2 + 5% CO2 + 3% O2) over a packaging with ordinary air on shelf-life and the quality of cauliflower after harves...

The aim of this research is to study the effects of modified atmosphere packaging (MAP) with a gas mixture (92% nitrogen, 5% carbon dioxide and 3% oxygen) and a packaging with ordinary air on shelf-life and the quality of cauliflower after harvesting. Polyethylene (PE) and polypropylene (PP) pouches with 40 µm thickness were used for packaging. Fou...

Thermoelectric generators (TEGs) have mostly been used in niche applications due to the low efficiency. This study aims to evaluate the effect of different material transport properties such as Seebeck coefficient, thermal conductivity, and electrical resistivity, on the system-level performance of the TEGs. A mathematical model was developed in MA...

In microwave heating process, electric field intensity is the main parameter that controls the temperature rise in the material. With this parameter and available material properties, temperature changes are predictable. In this study, a new setup based on a domestic microwave oven was developed and uniform microwave radiation at 2450 MHz was lunch...

Managing the production of greenhouse products requires knowledge of controlling many environmental factors and plant nutrition and fight against pests and plant diseases. Recognition pests and fight against them is one of the most important activities in the process of production of greenhouse products. Pre-knowledge of the demographic density of...

Global warming and air pollution concerns make renewable energies inevitable. Thermoelectric (TE) generators—solid-state devices which can convert thermal energy into electricity—are one of the candidates to capture the energy of the sun’s rays. Impact of high thermal on flat panel Solar Thermoelectric Generator (STEG) performance is known. In this...

The incidence of fruit postharvest losses and waste due to mechanical damage during handling is a major problem in the fresh produce industry. The objectives of this study were to investigate the impact of bruise damage susceptibility of pomegranates during harvesting, sorting, packaging, and transportation. A drop testing technique was used, as it...

Most of fruits and vegetables is not consumed after harvest and should be stored for a short or a long period of time and in the absence of adequate packaging, they are quickly withered and brown and lose their quality and marketability. Choosing the right packaging is very effective to increase the shelf life of agricultural products. Experts have...

The quality evaluation is one of the key factors that have a major impact on the final price of agricultural products. Nowadays, image processing‐based techniques are becoming as an acceptable and widespread in quality evaluation procedures. In this study, we develop a robust method based on image processing and computational intelligence for quali...

The present study was conducted in Varamin city of Tehran province in Iran. This research addressed the energy analysis of broiler production units. Artificial neural networks (ANNs) were used in order to model energy ratio index on the basis of input energies. Data were gathered from 40 broiler production farms in summer season using a face to fac...

The present study was conducted in Varamin city of Tehran province, Iran. The environmental impact of broiler production at farm gate and chicken meat production at slaughterhouse gate per mass-based functional unit in summer and winter seasons were evaluated using life-cycle assessment (LCA) methodology. Environmental impact categories including a...

The quality evaluation of agricultural products is one of the key factors in promoting their quality. In this study, a method based on combined image processing technique and artificial neural network was presented. Separation of touching almonds under different positions is a very important step in design of grading devices. In this study, an imag...

Ratio of 15:8:15 (15% nitrogen, 8% phosphorus and 15% potassium) is the dominant ratio of NPK fertilizers in Iran. The aim of this present paper was to study the energy consumption of the NPK-15:8:15 granulation process, and economic analysis of NPK-15:8:15 fertilizer granulation process. For this purpose, the data on 8 NPK-15:8:15 fertilizer plant...

Ratio of 15:8:15 (15% nitrogen, 8% phosphorus and 15% potassium) is the dominant ratio of NPK fertilizers in Iran. The aim of this present paper was to study of the energy consumption of the NPK-15:8:15 granulation process, and economical analysis of NPK-15:8:15 fertilizer granulation process. For this purpose, the data on 8 NPK-15:8:15 fertilizer...

Spray drift study for reducing environmental hazards and protecting crops is of high importance as the pesticides used today are more active and many are non-selective. The aim of this research was to design, construct and assess an intelligent system to measure the level of the spraying drift. The main parts of the system were liquid supply mechan...

Hyperspectral imaging is a non-destructive technique with great capability to detect food defects and diseases. In this research, infection of pistachio kernels by two different isolates of Aspergillus flavus, KK11 and R5, was determined using long-wave near-infrared hyperspectral imaging. Seven fungal growing stages on pistachio kernels, for both...

This study employed artificial neural network method for predicting the sprayer drift under different conditions using image processing technique. A wind tunnel was used for providing air flow in different velocities. Water Sensitive Paper (WSP) was used to absorb spray droplets and an automatic algorithm processed the images of WSPs for measuring...

در سال های اخیر توجه به مسائل زیست محیطی افزایش یافته است. ارزیابی چرخه زندگی عبارت از روشی است که در آن کلیه اثرات زیست محیطی مرتبط با یک محصول در کل چرخه زندگی آن ارزیابی می شود. هدف از این تحقیق استفاده از رویکرد ارزیابی چرخه زندگی در ارزیابی اثرات زیست محیطی تولید کود سوپر فسفات ساده می باشد. بدین منظور داده‌های سه ماه (اردیبهشت، تیر و مرداد سا...

The main aim of this study was the prediction if environmental indices of tobacco production in north of Iran. Data were collected randomly from 90 farms in Mazandaran province by face to face questionnaire method. Initially, Life cycle assessment (LCA) methodology was developed to assess all the environmental impacts associated with tobacco cultiv...

در این مطالعه، ارزیابی آلاینده‌های زیست‌محیطی تولید سیگار در مجتمع دخانیات استان گیلان با رویکرد ارزیابی چرخه‌ی حیات انجام شد. اطلاعات لازم از طریق بازدید از کارخانه‌های مجتمع دخانیات استان گیلان و مصاحبه با کارشناسان مربوطه به دست آمد. نرم‌افزار سیماپرو جهت ارزیابی چرخه‌ی حیات تولید سیگار مورداستفاده قرار گرفت. نتایج این بررسی نشان داد که فرآیند ت...

Pomegranate fruit quality is adversely affected by bruise damage. Bruises are formed by a variety of static loads and dynamic impacts on the fruit when it strikes any other object during handling, sorting, packaging or transportation. In order to be able to reduce this damage, it is necessary to ascertain the influence of fruit properties on bruise...

Thermal imaging has been considered as a new beneficial technique for inspectional aims in agriculture and also in food safety and food control. In this research, fungal infection caused by KK11 and R5 isolates of Aspergillus flavus fungi was detected by thermal imaging technique. Seven infection stages were considered to be identified by the techn...

Flesh color of watermelon is often used as a major postharvest criterion by consumers to assess fruit quality. In this paper a non-destructive method was studied to determine watermelon (Crimson Sweet) internal color. Responses of samples to excitation vibrations were detected using laser Doppler vibrometry (LDV) technology. Phase shift between inp...

It is very difficult to judge watermelon ripeness by external characteristics. The laser Doppler vibrometer (LDV) is a new approach to determination of fruit quality. This optical-mechanical technique was utilized for nondestructive detection of the vibration response of watermelons to predict ripeness. Finite element modeling (FEM) was used to fin...

Nowadays, use of new methods such as machine vision for the quality evaluation of agricultural product is getting more popular. Image processing is one of the main methods has been used by many researches. To evaluate the quality of almond products using this method, different steps were performed. These include: pre-processing, image segmentation,...

The aim of this study was to determine energy consumption pattern and specifically to measure and benchmark the effi- ciency for white button mushroom production in Alburz province of Iran. The data used in this study were collected by interviewing mushroom producers in the region. In the surveyed farms, average yield and total energy consumption w...

Thermal images have beneficial information which can be used for diagnostic purposes. The information can be released by applying appropriate analyses methods. In this research, a new algorithm, threshold based classification (TBC), was developed to analyze thermal images of healthy and fungal-infected pistachio kernels in MATLAB 2010A environment....

Flesh texture quality is an important attribute for watermelons that can be used as a ripeness indicator for sorting fruits. A non-destructive method is employed here, based on vibrations response, to assess the consumer opinion about watermelon (Crimson Sweet) tissue. The responses of samples to vibration excitation were recorded by laser Doppler...

In this paper, an efficient procedure for ripeness detection of watermelon was presented. A nondestructive method was used based on vibration response to determine the internal quality of watermelon. The responses of samples to vibration excitation were optically recorded by a Laser Doppler (LD) vibrometer. Vibration data was collected from waterme...

An experimental system based on acoustic technology was set up to non-destructively determine the ripeness of two export melon varieties (Zard-Eyvanekey, Sousky-Sabz). The system comprised a mechanical impulse device, sound sensor (sound level meter), recording signal equipment and the melon patch. Fruit was excited by the pendulum and the response...

The assessment of watermelon ripeness on the basis of its apparent properties, such as size or skin colour, is very difficult as traditional methods have various problems and limitations. These include lack of uniformity, concentration of excitation energy within narrow bands and need for physical contact between a fruit and the measuring device. I...

It is difficult to judge ripeness by outward characteristics such as size or external color. In this paper a nondestructive method was studied to determine watermelon (Crimson Sweet) quality. Responses of samples to excitation vibrations were detected using laser Doppler vibrometry (LDV) technology. Phase shift between input and output vibrations w...

Judging watermelon quality based on its apparent properties such as size or skin color is difficult. Traditional methods have various problems and limitations. In this paper a nondestructive method for quality watermelon test using laser Doppler vibrometery technology (LDV) have been presented which hasn't some limitations. At first the sample was...

In present research, acoustic signals of MF285 gearbox are used for fault diagnosis of gears. Two common gears faults are used: Worn tooth face and broken tooth. Signal processing is done by discrete wavelet transform using Db4 mother wavelet. Decomposition is done in fourth level and then data mining techniques are implemented to extract several f...

In this study, the dropping time of Hayward kiwi fruit was theoretically formulated and then determined experimentally using water column. Some effective characters of kiwi fruit on rising time were determined using standard methods. The best model for dropping time of Hayward kiwi fruit was found as: with R2 = 0.96. The difference of fruit density...

Abstract Crops and agricultural products are subject to natural loading during growth. Different mechanical forces are also exerted on them during harvest. One product, sugar cane, experiences large shear forces are during harvest. An examination of the crop properties and machine parameters of sugar cane are necessary to develop appropriate cut...

In this research, physical and nutritional properties of two Iranian apple varieties (Golab Kohanz, Shafi Abadi) were determined and compared. The physical properties were average fruit length, width and thickness, geometric, arithmetic and equivalent mean diameters, projected area, surface area, sphericity index, aspect ratio, fruit mass, volume,...

In this research, fracture resistance of wheat grain was measured in terms of grain rupture force and energy. The wheat grains were quasi-statically loaded in horizontal and vertical orientations with moisture content in three levels: 7.8%, 15%, and 20%; and loading rate in two levels: 5 and 10 mm min -1 . Based on the results obtained, the force r...

Creep and stress relaxation are two important phenomena observed in viscoelastic materials. In this study creep and stress relaxation properties of two Iranian apples varieties (Shafi Abadi and Golab Kohanz) was investigated. A model based on generalized Maxwell model (contain of a single M axwell model in parallel with a free spring) was used for...

The mechanical properties data of fruits are important in the design of various handling, packing, storage and transportation systems. In this research some mechanical properties of two Iranian apple varieties (Golab Kohanz and Shafi Abadi) were analyzed in moisture contents 86% and 84% (W.b) for Golab Kohanz and Shafi Abadi varieties, respectively...

JD 955 combine manufactured by Iran Combine Harvester Manufacturing Company was modified. Total weight and the loads applied on front axle of modified combine were increased. The commercial finite element package ANSYS V9.0 was used for the solution of the problem. Based on finite element analysis, redesign of front axle was carried out for increas...

Aboonajmi M., Akram A., Nishizu T., Kondo N., Setarehdan S.K., Rajabipour A., 2010. An ultrasound based technique for the determination of poultry egg quality . Res. Agr. Eng., 56: 26-32. The present study investigates the possibility of the non-destructive prediction of the main quality indices of commercial eggs by calculating the ultrasound phas...

Mass modeling can be used for development of post-harvest equipment related to onion (Allium cepa L.) processing such as grading, packing and food production processes. There are instances in which it is desirable to determine relationships among crop physical characteristics. In this study, the mass of Iranian export onion varieties (Azarshahr and...

In this study, two theories for terminal velocity of fruits were proved by authors as KHAT1 and KHAT2 theories. Terminal velocity of Redspar apples was experimentally measured using water column and video camera. Some apple characteristics that affect on terminal velocity of apple based on proved theories were determined using standard methods. The...

John Deere 3140 tractors work powerful and useful in Iran farmlands. In this study two fuel flow meter sensors were used for measuring tractor fuel consumption and the measurement system was installed on diesel engine of a 72.3kW John Deer 3140 tractor. A three-share moldboard plow was used for studying the effect of plow depth variations on tracto...

Retracted: The following article from Journal of Food Process Engineering, “Hydro-sorting of Apple Using Terminal Velocity in Water” by Kamran Kheiralipour, Ahmad Tabatabaeefar, Hossein Mobli, Shahin Rafiee, Ali Rajabipour, and Ali Jafari published online on 22 February 2010 in Wiley Online Library ( http://www.onlinelibrary.wiley.com), has been re...

Vibration generated by vehicles during road transport has an important effect on the agricultural products damage process, particularly vegetable and fruit. Modulus of elasticity is one of the most important mechanical properties of fruits and its variation can be described as one of the damage criteria during transportation. This research was cond...

The mechanical properties data of fruits are important in the design of various handling, packing, storage and transportation systems. In this research some mechanical properties of two Iranian apple varieties (Golab Kohanz and Shafi Abadi) were analyzed in moisture contents 86% and 84% (W.b) for Golab Kohanz and Shafi Abadi varieties, respectively...

Force and deformation curves of agricultural materials must be provided for the proper design of harvest - ing and processing machineries. In this research, the fracture resistance of barley grain was measured in terms of the grain rupture force and energy. In this study, 8 treatments were performed as a randomised complete block design with 10 rep...

Some physical and mechanical properties of cumin seed were obtained as moisture content changed from 7.24% to 21.38% d.b. Increasing of moisture content was found to increase the seed length (5.14-5.58 mm), width (1.33-1.55 mm), thickness (0.97-1.05 mm), arithmetic mean diameter (2.48-2.73), geometric mean diameter (1.88-2.09 mm), surface area (10....

Determination of physical and mechanical properties of seeds and agricultural products is important in the design ofharvesting, handling, and processing equipment. Some physical and mechanical properties of fennel seed weredetermined as a function of moisture content in the range of 7.78–21.67% d.b. The average length, width and thicknesswere 58.87...

Designing equipment for processing, sorting, sizing and other post-harvest operations of agricultural products requires information about their physical properties. This study was carried out to evaluate the effect of moisture content on some physical properties of barley grains. Four levels of moisture content ranging from 7.34% to 21.58% (d.b.) w...

Fruit bruising could occur during handling, transportation and storage. It is invisible in many cases of fruits such as watermelon. In this study, nonlinear finite element analysis (FEA) was used to investigate internal bruising in watermelon compressed in longitudinal and transverse directions by parallel plates. The applied forces on models were...

Several physical properties as physical characteristics, mechanical, hydrodynamic and nutritional properties of two apple varieties (Redspar and Delbarstival), were determined and compared using Duncan`s multiple ranges test. Physical characteristics such as: average fruit length, width, thickness, the geometric, arithmetic and equivalent mean diam...

In this paper several physical properties of barberry have been evaluated as a function of moisture content varying from 12.64 to 89.23% (w.b.). With increasing in moisture content from 12.6 to 89.23% (w.b.); the barberry length, width, thickness, geometric mean diameter and surface area was increased from 8.11 to 12.01 mm, 1.81 to 5.81 mm, 1.79 to...

In this study some mechanical properties of barberry have been evaluated as a function of barberry moisture content varying from 53.11 to 89.23% w.b. The mechanical properties of barberry were determined in terms of average rupture force, deformation and toughness. Samples at various moisture contents were compressed along axis through the width di...

Several physical and hydrodynamic properties of two apple varieties (Redspar and Delbarstival), newly planted varieties in Iran, were determined and compared. These properties are necessary for the design of equipments for harvesting, processing, transporting, sorting, separating and packing. Some physical characteristics such as: average fruit len...

Knowledge of airflow resistance is an important consideration in designing an appro-priate ventilation system and for proper fan selection. An airflow resistance device was designed and fabricated to measure the airflow resistance of potatoes. The device the composed of an air compressor, a rotameter, a cylindrical bin to contain the potatoes and a...

Fruit shape is one of the most important quality parameters for evaluation by consumer performance. Also misshapen fruits are usually rejected according to grading standards of fruit. This case is more considered for watermelons, because of large size and sensitive skin. This study was carried out to determine "detection algorithm" for misshapen wa...

Orange is among the popular fruits and of a high economical value. Sizing and grading of orange is needed for the fruit to be presented to local and foreign markets. A study of orange physical properties is therefore indispensable. Some physical properties of grade one (large), two (medium) and three (small) oranges were investigated. These propert...

Aerodynamic properties of wheat are important factors in pneumatic conveying, separating and cleaning machines. Among the properties, terminal velocity is very important. Terminal velocity of wheat measured with a designed vertical wind column. Three different varieties of wheat as Pishtaz, Mahdavi and Marvdasht were tested. The wheat's verities we...

JD 955 combines manufactured by Iran Combine Manufacturing Company was modified. Resulting from the applied modifications, total weight and the loads applied on front axle of modified combine were increased. Stress analysis of front axle of JD 955 combine under static loading conditions resulted from the applied modifications was performed by using...

Iran has an apple production of 1.9 million tons, seventh largest in the world. However, in comparison to this production the export of apples is very small (0.19 million tons).There are some situations in which it is desirable to determine relationships between physical attributes. Models for predicting the mass of apples from their dimensions and...

In order to determine the suitable stroke and frequency for the detachment percentage of pistachio nut and cluster off the tree, a mechanical shaker was used. In the three experiments with 125 trees from 10 different varieties of pistachios, a 9 Hz frequency and a 25 mm stroke were found to be the most suitable choice for shaking. In the final expe...

Two techniques of measuring tomato (Lycopersicon esculentum Mill. cv. New Yorker) skin strength under tension were compared. An evaluation of the standard grip technique and a new loop technique indicated that the latter showed a lower coefficient of variation for load/width, stress, and strain measured under tension. The loop technique was used to...

Aerodynamic properties of Wheat and Rice (paddy) are important factors in pneumatic conveying, separating and cleaning machines. Among the properties terminal velocity is very important. A wind tunnel was used to measure terminal velocity of wheat and rice. The materials were tested at moisture content of 8%, 12%, 14%, 18%, 22% . Random sampling of...

The harvested walnut has a relatively high moisture content of 30% compared with the safe storage moisture content of 8%. One of the common means of reducing the moisture content is by drying. For design of drying and other aeration systems for agricultural products including walnuts, the relationship between the drop in pressure and airflow ve-loc...

In a 2-year study (1993-94), tomato (Lycopersicon esculentum Mill. 'New Yorker') plants grown in a sandy loam soil in field lysimeters were subjected to four water table depth (WTD) treatments (0.3, 0.6, 0.8, and 1.0 m from the soil surface). In 1994, precipitation during the flowering stage was far above average and apparently led to waterlogging...

In a 2-year study (1993-94), tomato (Lycopersicon esculentum Mill. `New Yorker') plants grown in a sandy loam soil in field lysimeters were subjected to four water table depth (WTD) treatments (0.3, 0.6, 0.8, and 1.0 m from the soil surface). In 1994, precipitation during the flowering stage was far above average and apparently led to waterlogging...

This study was carried out to evaluate the effect of moisture content on some physical properties and mechanical behaviour under compression load of soybean grains (Glycine max L.). Four levels of moisture content ranging from 6.92 to 21.19 % d.b. were used. The average length, width, thickness, arithmetic and geometric mean diameter, surface area,...

In order to determine the suitable amplitude and frequency for detachment percent of pistachio nut and cluster of the tree, a mechanical shaker was used. In the three experiments with 155 trees (from 10 different varieties) of pistachios which, had been found a nine C.P.S frequencies and 25 mm amplitude were most suitable choice for shaking. In the...

Terminal velocity of fruits in water is a means of hydro-sorting of them. In this study, the terminal velocity of fruits in water was theoretically formulated and then determined experimentally using water column. Some effective characters of two varieties of apple and Hayward kiwi fruit on terminal velocity were determined using standard methods....

Two series of tests were performed in summer 1993 and repeated in summer 1994 to investigate effects of potassium, calcium and water table depth on mechanical properties of tomato fruit. In the first group of tests five mechanical properties stress, strain, ER (ratio of stress to strain at break), energy and toughness were calculated from the force...