Food Additives & Contaminants: Part A, Apr 14, 2015
The feasibility of using visible/near-infrared (Vis/NIR) spectroscopy was assessed for non-destru... more The feasibility of using visible/near-infrared (Vis/NIR) spectroscopy was assessed for non-destructive detection of diazinon residues in intact cucumbers. Vis/NIR spectra of diazinon solution and cucumber samples without and with different concentrations of diazinon residue were analysed at the range of 450-1000 nm. Partial least squares-discriminant analysis (PLS-DA) models were developed based on different spectral pre-processing techniques to classify cucumbers with contents of diazinon below and above the MRL as safe and unsafe samples, respectively. The best model was obtained using first derivative method with the lowest standard error of cross-validation (SECV = 0.366). Moreover, total percentages of correctly classified samples in calibration and prediction sets were 97.5% and 92.31%, respectively. It was concluded that Vis/NIR spectroscopy could be an appropriate, fast and non-destructive technology for safety control of intact cucumbers by absence/presence of diazinon residues.
Site-specific tillage modifies soil physical properties by doing operation where is needed for cr... more Site-specific tillage modifies soil physical properties by doing operation where is needed for crop growth. Soil mechanical resistance is one of the most important factors affecting soil compaction, root growth and crop yield. Hence, researcher's interest increased to investigate the detection of the compacted soil zones. Soil cone penetrometer is being used to measure soil strength as a common method. However, it is time-consuming, labor-intensive and not practical method to determine soil compaction in a large-scale field. Therefore, there is a need for continuous and time-cost efficient method to identify the compacted zone. Although researchers have developed some methods in this issue but none of them worked during tillage operation. Therefore, in this research a sensor developed to measure soil mechanical resistance under tillage depth during operation for saving time and energy. This could also reduce the traffic on the field. Experimental studies were conducted in the soil bin with non uniform soil which was more compacted in a 10 cm depth where the sensor operated. The developed sensor was compared to a vertical penetrometer. The operating speed and soil moisture content were constant. The results indicated some similarities between the penetrometer and the new developed sensor. Moreover, the sensor measurements were more closely correlated to bulk density. The sensor was also able to detect plow pan when it combined with tillage equipment.
Agricultural and biosystems engineering for a sustainable world. International Conference on Agricultural Engineering, Hersonissos, Crete, Greece, 23-25 June, 2008, 2008
Abstract Site-specific tillage modifies soil physical properties by doing operation where is need... more Abstract Site-specific tillage modifies soil physical properties by doing operation where is needed for crop growth. Soil mechanical resistance is one of the most important factors affecting soil compaction, root growth and crop yield. Hence, researcher's interest ...
ﭘﯿﺶ ﺑﯿﻨﯽ ﻏ ﯿﺮﻣﺨﺮب ﺳﻔﺘ ﯽ ﺳ ﯿﺐ اﻧﺒﺎردار دوره ﻃﻮل در ي ﭘﺎ ﺑﺮ ﯾﻪ ﺗﺼﺎ... more ﭘﯿﺶ ﺑﯿﻨﯽ ﻏ ﯿﺮﻣﺨﺮب ﺳﻔﺘ ﯽ ﺳ ﯿﺐ اﻧﺒﺎردار دوره ﻃﻮل در ي ﭘﺎ ﺑﺮ ﯾﻪ ﺗﺼﺎو ﯾﺮ ﻧﻘﻄﻪ اي د ﯾﻨﺎﻣﯿﮑﯽ 151 which plays a main role in backscattering phenomenon is converted into simpler carbohydrates and it causes an increase in soluble solid contents and a decrease in the number of scattering centers. After developing the ANN models, the correlation coefficient of the prediction (r p) for different topologies was ranged from 0.74-0.81 and 0.81-0.83 for the wavelengths of 680 nm and 780 nm, respectively. Moreover, standard error of prediction (SEP) was between 8.4-9 N and 8.1-8.7 N for the wavelengths of 680 nm and 780 nm, respectively. The achieved results may be more attractive when they are compared with obtained results using multispectral/hyperspectral scattering imaging, as expensive and rather complicate techniques for non-destructive firmness assessment in apple fruits. Conclusions It was concluded that dynamic speckle patterns (DSP) or bio speckle imaging could be a simple, low-cost and appropriate technique for non-destructive prediction of firmness in intact apples during storage.
In recent years, application of near-infrared spectroscopy (NIR) as a non-destructive technique c... more In recent years, application of near-infrared spectroscopy (NIR) as a non-destructive technique combined with chemometric methods has been widely noticed for quality assessment of food and agricultural products. In chemometric methods, quality analyses are important issues which could be related to pattern recognition. In this research, the feasibility of pattern recognition methods combined with reflectance NIR spectroscopy for non-destructive discrimination of oranges based on their tastes was investigated. To this end, both unsupervised and supervised pattern recognition techniques, hierarchical cluster analysis (HCA) and soft independent modeling of class analogies (SIMCA) were used for assessing the feasibility of variety discrimination and classification (according to their taste), respectively, based on the spectral information of 930-1650nm range. Qualitative analyses indicated that NIR spectra of orange varieties were correctly clustered using unsupervised pattern recogniti...
Early diagnosis of plant diseases before the occurrence of symptoms can reduce the losses of the ... more Early diagnosis of plant diseases before the occurrence of symptoms can reduce the losses of the yield and increase the quality of agricultural crops. It also reduces the consumption of pesticides, environmental risks, and the cost of production. For this reasons, the objectives of the present research were non-destructive diagnosis of early blight of tomato plant and discrimination of the most important agents of early blight (A. solani and A. alternate) in the primary stages of incidence of the disease before appearing visual symptoms using Vis-NIR spectroscopy (400-900 nm). The spectral data were acquired from the leaves of the plants infected with A. solani and A. alternate, 48 hours, 72 hours, 96 hours, and 120 hours after inoculation. To develop the recognition model based on the spectral data, principal components analysis (PCA) coupled with artificial neural network (ANN) was used. The results showed that the PCA-ANN model could diagnose the infected plants and pathogen spec...
Food Additives & Contaminants: Part A, Apr 14, 2015
The feasibility of using visible/near-infrared (Vis/NIR) spectroscopy was assessed for non-destru... more The feasibility of using visible/near-infrared (Vis/NIR) spectroscopy was assessed for non-destructive detection of diazinon residues in intact cucumbers. Vis/NIR spectra of diazinon solution and cucumber samples without and with different concentrations of diazinon residue were analysed at the range of 450-1000 nm. Partial least squares-discriminant analysis (PLS-DA) models were developed based on different spectral pre-processing techniques to classify cucumbers with contents of diazinon below and above the MRL as safe and unsafe samples, respectively. The best model was obtained using first derivative method with the lowest standard error of cross-validation (SECV = 0.366). Moreover, total percentages of correctly classified samples in calibration and prediction sets were 97.5% and 92.31%, respectively. It was concluded that Vis/NIR spectroscopy could be an appropriate, fast and non-destructive technology for safety control of intact cucumbers by absence/presence of diazinon residues.
Site-specific tillage modifies soil physical properties by doing operation where is needed for cr... more Site-specific tillage modifies soil physical properties by doing operation where is needed for crop growth. Soil mechanical resistance is one of the most important factors affecting soil compaction, root growth and crop yield. Hence, researcher's interest increased to investigate the detection of the compacted soil zones. Soil cone penetrometer is being used to measure soil strength as a common method. However, it is time-consuming, labor-intensive and not practical method to determine soil compaction in a large-scale field. Therefore, there is a need for continuous and time-cost efficient method to identify the compacted zone. Although researchers have developed some methods in this issue but none of them worked during tillage operation. Therefore, in this research a sensor developed to measure soil mechanical resistance under tillage depth during operation for saving time and energy. This could also reduce the traffic on the field. Experimental studies were conducted in the soil bin with non uniform soil which was more compacted in a 10 cm depth where the sensor operated. The developed sensor was compared to a vertical penetrometer. The operating speed and soil moisture content were constant. The results indicated some similarities between the penetrometer and the new developed sensor. Moreover, the sensor measurements were more closely correlated to bulk density. The sensor was also able to detect plow pan when it combined with tillage equipment.
Agricultural and biosystems engineering for a sustainable world. International Conference on Agricultural Engineering, Hersonissos, Crete, Greece, 23-25 June, 2008, 2008
Abstract Site-specific tillage modifies soil physical properties by doing operation where is need... more Abstract Site-specific tillage modifies soil physical properties by doing operation where is needed for crop growth. Soil mechanical resistance is one of the most important factors affecting soil compaction, root growth and crop yield. Hence, researcher's interest ...
ﭘﯿﺶ ﺑﯿﻨﯽ ﻏ ﯿﺮﻣﺨﺮب ﺳﻔﺘ ﯽ ﺳ ﯿﺐ اﻧﺒﺎردار دوره ﻃﻮل در ي ﭘﺎ ﺑﺮ ﯾﻪ ﺗﺼﺎ... more ﭘﯿﺶ ﺑﯿﻨﯽ ﻏ ﯿﺮﻣﺨﺮب ﺳﻔﺘ ﯽ ﺳ ﯿﺐ اﻧﺒﺎردار دوره ﻃﻮل در ي ﭘﺎ ﺑﺮ ﯾﻪ ﺗﺼﺎو ﯾﺮ ﻧﻘﻄﻪ اي د ﯾﻨﺎﻣﯿﮑﯽ 151 which plays a main role in backscattering phenomenon is converted into simpler carbohydrates and it causes an increase in soluble solid contents and a decrease in the number of scattering centers. After developing the ANN models, the correlation coefficient of the prediction (r p) for different topologies was ranged from 0.74-0.81 and 0.81-0.83 for the wavelengths of 680 nm and 780 nm, respectively. Moreover, standard error of prediction (SEP) was between 8.4-9 N and 8.1-8.7 N for the wavelengths of 680 nm and 780 nm, respectively. The achieved results may be more attractive when they are compared with obtained results using multispectral/hyperspectral scattering imaging, as expensive and rather complicate techniques for non-destructive firmness assessment in apple fruits. Conclusions It was concluded that dynamic speckle patterns (DSP) or bio speckle imaging could be a simple, low-cost and appropriate technique for non-destructive prediction of firmness in intact apples during storage.
In recent years, application of near-infrared spectroscopy (NIR) as a non-destructive technique c... more In recent years, application of near-infrared spectroscopy (NIR) as a non-destructive technique combined with chemometric methods has been widely noticed for quality assessment of food and agricultural products. In chemometric methods, quality analyses are important issues which could be related to pattern recognition. In this research, the feasibility of pattern recognition methods combined with reflectance NIR spectroscopy for non-destructive discrimination of oranges based on their tastes was investigated. To this end, both unsupervised and supervised pattern recognition techniques, hierarchical cluster analysis (HCA) and soft independent modeling of class analogies (SIMCA) were used for assessing the feasibility of variety discrimination and classification (according to their taste), respectively, based on the spectral information of 930-1650nm range. Qualitative analyses indicated that NIR spectra of orange varieties were correctly clustered using unsupervised pattern recogniti...
Early diagnosis of plant diseases before the occurrence of symptoms can reduce the losses of the ... more Early diagnosis of plant diseases before the occurrence of symptoms can reduce the losses of the yield and increase the quality of agricultural crops. It also reduces the consumption of pesticides, environmental risks, and the cost of production. For this reasons, the objectives of the present research were non-destructive diagnosis of early blight of tomato plant and discrimination of the most important agents of early blight (A. solani and A. alternate) in the primary stages of incidence of the disease before appearing visual symptoms using Vis-NIR spectroscopy (400-900 nm). The spectral data were acquired from the leaves of the plants infected with A. solani and A. alternate, 48 hours, 72 hours, 96 hours, and 120 hours after inoculation. To develop the recognition model based on the spectral data, principal components analysis (PCA) coupled with artificial neural network (ANN) was used. The results showed that the PCA-ANN model could diagnose the infected plants and pathogen spec...
Uploads