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ahmad sharifi

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تصریح و متنیت در ترجمه

Translation Studies Quarterly, Dec 31, 2009

Evaluation of regeneration potential of different layers of Amaryllis (Hippeastrum × johnsonii) bulb under influence of growth regulators

Biyutiknuluzhi-i kishavarzi, 2020

Objective Amaryllis is one of the ornamental bulbous plants, whose reproduction occurs slowly in ... more Objective Amaryllis is one of the ornamental bulbous plants, whose reproduction occurs slowly in natural conditions. Therefore, using tissue culture technique can be a suitable way to increase the multiplication rate of this ornamental plant. Material and methods In this study, a factorial experiment was conducted in a completely randomized design with 5 replications. The effect of different concentrations of BA and Kin (0, 0.5, 1 and 2 mg/L) in combination with 0.1 mg/L NAA on regeneration of different twin scale type of amaryllis was evaluated. Explants were divided as twin scales and classified in 4 groups, so that the outermost twin scales was grouped in class 1 and the innermost twin scales was grouped in class 4. Results The results showed that the diameter of produced bulblet was influenced by the position of the twin scales in the mother bulb. The twin scale group one, which was made from the outer layers of the bulb, produced thicker bulblets, while the twin scales grou...

Effect of Cultivar and Plant Growth Regulators on Invitro Regeneration of Lilium Spp. Utilizing Thin Cell Layer Explants

Majallah-i ̒Ulum-i Bāghbānī, 2018

Introduction: Lily (Lilium spp.) is a genus of herbaceous flowering plants, which consisted of ma... more Introduction: Lily (Lilium spp.) is a genus of herbaceous flowering plants, which consisted of many beautiful ornamental species with large prominent flowers. Most species are native to the Northern hemisphere temperate, though their range extends into the Northern subtropics. Some specific hybrids of Lilium spp. have been developed as cut flower in controlled conditions and in some cases can be grown as pot plant. Propagation rate of lily in natural clonal propagation methods is very low and one year produces of 1-2 bulblets per bulb scale. There is also possibility of disease transmission; so that, tissue culture techniques has provided an efficient method for its micropropagation. Materials and Methods: In this study, two separate experiments under In vitro conditions the bulblet regeneration from thin cell layer (TCL) explants of Lilium spp. was investigated. In the first experiment, after two months the effect of TCL explants with 1, 3 and 5 mm thickness on MS medium containing...

Optimization of Indirect Regeneration in Anthuriumscherzerianum

Majallah-i ̒Ulum-i Bāghbānī, 2017

Introduction: Anthurium is a popular genus of the Araceae (order Spathiflorae).The flower consist... more Introduction: Anthurium is a popular genus of the Araceae (order Spathiflorae).The flower consists of a protruding spadix containing numerous florets, subtended by a brightly colored modified leaf, the spathe. Anthuriums are bisexual and protogynous.Anthuriumscherzerianum as the most important species ofAnthurium genus is a potted perennial plant. Due to having beautiful, attractive and long-life flowers, A. scherzerianum can be used for the production of pot and cut flowers. Tissue culture is suggested as the most commonly method in order to rapid propagation and removing disease in a short period of time. This method also recommended for Anthuriumbecause of problems in classical propagation method of this flower..The three basic propagation methods for Anthuriumare propagation by seed, traditional vegetative and tissue culture.Micropropagation of Anthurium is using forcommercial production. Materials and Methods: In this study, the effect of plant growth regulators and explants on...

Additional file 1: of Efficiency of different strategies to mitigate ascertainment bias when using SNP panels in diversity studies

Zip file containing allele frequency spectrum figures of each population. (ZIP 11230Â kb)

Security Attacks and Solutions On Ubiquitous Computing Networks

40 Abstract— Ubiquitous computing evolved tremendously and became an integral part of many fields... more 40 Abstract— Ubiquitous computing evolved tremendously and became an integral part of many fields and application domains. It not only causes maximized availability for users with wired or wireless networks but also supports any information technology equipment such as cell phones, PDAs, car navigation terminals and consumer information appliances as well as desktop computers and mobile PCs. This new computing paradigm also brings along modern and unique security challenges regarding vulnerabilities and appropriate solutions. Possible solutions for threats of ubiquitous environment to address these security issues are highlighted.

Efficiency of different strategies to mitigate ascertainment bias when using SNP panels in diversity studies

BMC genomics, Jan 5, 2018

Single nucleotide polymorphism (SNP) panels have been widely used to study genomic variations wit... more Single nucleotide polymorphism (SNP) panels have been widely used to study genomic variations within and between populations. Methods of SNP discovery have been a matter of debate for their potential of introducing ascertainment bias, and genetic diversity results obtained from the SNP genotype data can be misleading. We used a total of 42 chicken populations where both individual genotyped array data and pool whole genome resequencing (WGS) data were available. We compared allele frequency distributions and genetic diversity measures (expected heterozygosity (H e ), fixation index (F ST ) values, genetic distances and principal components analysis (PCA)) between the two data types. With the array data, we applied different filtering options (SNPs polymorphic in samples of two Gallus gallus wild populations, linkage disequilibrium (LD) based pruning and minor allele frequency (MAF) filtering, and combinations thereof) to assess their potential to mitigate the ascertainment bias. Rar...

Indirect regeneration from cotyledonary explants of watermelon (Citrullus lanatus) at in vitro culture

International Journal of Advanced Research, 2016

A modified arrangement of multi-prismatic tips on a horizontal sensor for on-the-go measurement of soil mechanical resistance

A study was conducted to investigate a different arrangement of prismatic tips on a tine for on-t... more A study was conducted to investigate a different arrangement of prismatic tips on a tine for on-the-go measuring soil mechanical resistance at various compacted soil layers in the soil bin. In order to do this, four prismatic tips with apex angle of 30º and base area of 323 mm2 were mounted horizontally on a tine face and then connected to load cells. The length of shafts was reduced from top to down the tine. The developed system was evaluated in a controlled soil bin laboratory conditions with clay loam soil and uniform soil moisture content. The experiment was designed with soil compaction at three levels of uniform and three levels of non-uniform in completely randomized block design with four replications. Vertical standard penetrometer was also used to compare with horizontal sensor data at whole working depth of 0 to 400 mm. The results indicated that there was a correlation with R2 = 0.88 between soil cone penetrometer and the horizontal multi-tips sensor data. It can be concluded that the idea of reducing the length of the tips from top to down the tine face would give promising results. Link of the paper: https://www.wflpublisher.com/Abstract/2409

The Effect of Frizzle Gene and Dwarf Gene on Egg Quality of Broiler Breeder Dams Under High and Temperate Ambient Temperature

Physical investigation of the potential of Vis/NIR spectroscopy for fast and non-destructive detection of pesticide residues in agricultural products

In this research, the feasibility of visible/near-infrared (Vis/NIR) spectroscopy for non-destruc... more In this research, the feasibility of visible/near-infrared (Vis/NIR) spectroscopy for non-destructive detection of pesticide residues in agricultural products (a case study on Diazinon in greenhouse cucumber) was physically investigated. To this end, Vis/NIR spectra of Diazinon and cucumber samples without and with different concentrations of pesticide residues were analyzed and interpreted. Results indicated that Vis/NIR spectroscopy have physically the potential for detection of pesticide residue in the product. It was noted that this technique combined with chemometrics methods can be utilized for fast and non-destructive detection of pesticide residues in agricultural products.

Non-destructive measurement of pesticide residues in agricultural products using Vis/NIR spectroscopy and chemometrics

In this research, the feasibility of using visible/near-infrared (Vis/NIR) spectroscopy combined ... more In this research, the feasibility of using visible/near-infrared (Vis/NIR) spectroscopy combined with chemometrics was assessed for measurement of pesticide residues in agricultural products (a case study on Diazinon in greenhouse cucumber). Partial least squares (PLS) regression models were developed based on chemical reference measurements and the spectral information of the samples in 450-1000nm after performing different pre-processing methods. Results indicated that Vis/NIR spectroscopy combined with chemometrics have satisfactorily the potential for fast and non-destructive measurement of Diazinon residue in cucumber samples. Best prediction results were achieved with PLS model developed based on the combination of pre-processing methods of multiplicative scatter correction (MSC) and first derivative (D1) (rcv=0.91, SECV=3.22).

Carnation etched ring virus elimination through shoot tip culture

Carnation etched ring virus (CERV) is the second most destructive virus which infects carnation a... more Carnation etched ring virus (CERV) is the second most destructive virus which infects carnation and the only DNA virus among infecting viruses of carnation. In symptomatic leaves of carnation consist of mottling, necrotic and chlorotic flecks or blotches. Virus was detected by DAS-ELISA and PCR. Treatments consisted of different sizes of meristem and MS medium supplemented with different plant growth regulators (PGRS) (0.5 mg/l benzyl adenine (BA), 0.5 mg/l gibberellic acid (GA3) and medium without PGRS.). The plantlets were analysed by PCR in order to evaluate virus eradication. Results of PCR in vitro culture revealed that explant size and type of PGRS had a significant effect on elimination of CERV and the highest amount of it (100%) was observed on medium containing BA in meristem size of 0.4, 0.7 mm and the lowest amount of it (26%) was occurred on medium supplemented with GA3 in meristem size of 1mm. So far, there is no reporting about influence of PGRS on elimination of viruses.

Optimization of lavender (Lavandula angustifolia) callus culture

Plant Tissue Culture and Biotechnology, 2015

Non-destructive detection of pesticide residues in cucumber using visible/near-infrared spectroscopy

Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment, Jan 19, 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 resi...

Online time-optimal trajectory planning in dynamic workspace of cable suspended robots

2014 Second RSI/ISM International Conference on Robotics and Mechatronics (ICRoM), 2014

This paper presents a method for online trajectory planning of cable suspended robots. A three de... more This paper presents a method for online trajectory planning of cable suspended robots. A three degrees-of-freedom spatial cable robot is studied in this analysis. By deriving dynamic model of the robot, cable force restrictions will induce a set of algebraic inequalities in dynamic equations. Direction of required tracking acceleration reveals feasible motion of the robot, which guarantees non-violation of cable force bilateral bounds. Required tracking acceleration is in the direction of instantaneous minus desired velocity vectors with specified magnitude. Furthermore, alternative recipes are employed to decrease negative impacts of unwanted inputs and applying actuator constraints in trajectory planning. Finally, several simulations are presented to demonstrate success of the method. Proposed approach can be used in online trajectory tracking for all cable-driven parallel suspended robots akin to what is realized for the presented three degrees-of-freedom robot.

Design, Simulation and Construction of Two Synchronized DC Motors' Driver for EVs

International Conference on Mechanical and Electrical Technology 2009 (ICMET 2009)

Electric vehicles (EVs) are simplest way to replace fossil fuel powered vehicles. EVs are relativ... more Electric vehicles (EVs) are simplest way to replace fossil fuel powered vehicles. EVs are relatively cheap, have little environmental impact and are a technology which is available here and now. Using an electronic control board and two power boards, a high power EV drive system was designed and constructed (designed for the vehicles up to 100 kW). The controller uses power IGBT module and microcontroller technology to simultaneously control two DC series motors. The driver controls direction of motion and causes differential speeds of motors relative to steering rod and acceleration pedal position. Driver simulation in MATLAB proved that the required conditions of the problem were satisfied by PID controller; and the optimum values for the control parameters K p , K i and K d were found to be 320, 350 and 40, respectively. The result of simulation for these motors indicated that for start up a high torque is available.

Evaluation of alternative battery technologies for a solar assist plug-in hybrid electric tractor

Transportation Research Part D: Transport and Environment, 2010

This paper looks at the various battery technologies available for use in solar assist plug-in hy... more

3D finite element simulation of a single-tip horizontal penetrometer–soil interaction. Part I: Development of the model and evaluation of the model parameters

Soil and Tillage Research, 2013

ABSTRACT A fundamental step to employing a horizontal penetrometer for on-the-go measurement of s... more ABSTRACT A fundamental step to employing a horizontal penetrometer for on-the-go measurement of soil compaction is to characterize the horizontal penetrometer resistance (PR) as affected by soil mechanical/physical properties and design/operational parameters of the penetrometer. Such complicated soil–tool interactions are preferably investigated using numerical analyses, e.g. finite element (FE) method. A symmetric 3D FE model for a single-tip horizontal penetrometer–soil interaction was developed and evaluated in ABAQUS/Explicit. In the first paper of this study, we focus on the development of the model and the evaluation of some affecting parameters, namely (i) boundary effects, (ii) element size (mesh density) around the conical tip of the penetrometer, (iii) sensitivity of the predicted PR with respect to (a) soil mechanical properties (b) tip extension (i.e. the distance between cone base and shin of the carrying tine), (c) working depth, and (iv) soil layering and the effect of working depth in relation to the tine critical depth. The elastic–plastic parameters of the soil constitutive model (Drucker–Prager) were determined from samples taken within the working depth of the penetrometer in a soil bin. The results showed that for the tested penetrometer dimensions and the given soil specifications (i) the simulated soil box should be at least 0.8 m long and 0.4 m wide to avoid interference from the boundaries on predicted PR; (ii) the element size around the cone should be fine enough (9 mm) for a stable steady-state simulated PR; and (iii) the tip extension must be &gt;4 cm to avoid the effect of tine on PR. PR was found to be most sensitive to soil internal angle of friction and compressive yield stress, whilst Poisson&#39;s ratio had no significant effect, and Young&#39;s modulus of elasticity and soil-metal coefficient of friction showed only minor impacts on PR. Due to soil surcharge, PR increased by 30% when increasing the working depth of the penetrometer from 5 to 40 cm in a homogenous soil profile. An effective radius of 6 cm was found for the soil failure around the cone. The simulations showed that when the cone was located above the tine critical depth (i.e. inside the crescent failure zone), the PR was lower and the PR signal was unstable compared with when the cone worked out of crescent failure zone at the same depth. The model developed here can be used to characterize PR with respect to the state of soil strength/compaction across soil types.

A review of principle and sun-tracking methods for maximizing solar systems output

Renewable and Sustainable Energy Reviews, 2009

Finding energy sources to satisfy the world's growing demand is one of society's foremost challen... more Finding energy sources to satisfy the world's growing demand is one of society's foremost challenges for the next half-century. The challenge in converting sunlight to electricity via photovoltaic solar cells is dramatically reducing $/watt of delivered solar electricity. In this context the sun trackers are such devices for efficiency improvement. The diurnal and seasonal movement of earth affects the radiation intensity on the solar systems. Suntrackers move the solar systems to compensate for these motions, keeping the best orientation relative to the sun. Although using sun-tracker is not essential, its use can boost the collected energy 10-100% in different periods of time and geographical conditions. However, it is not recommended to use tracking system for small solar panels because of high energy losses in the driving systems. It is found that the power consumption by tracking device is 2-3% of the increased energy. In this paper different types of sun-tracking systems are reviewed and their cons and pros are discussed. The most efficient and popular sun-tracking device was found to be in the form of polar-axis and azimuth/elevation types.

تصریح و متنیت در ترجمه

Translation Studies Quarterly, Dec 31, 2009

Evaluation of regeneration potential of different layers of Amaryllis (Hippeastrum × johnsonii) bulb under influence of growth regulators

Biyutiknuluzhi-i kishavarzi, 2020

Objective Amaryllis is one of the ornamental bulbous plants, whose reproduction occurs slowly in ... more Objective Amaryllis is one of the ornamental bulbous plants, whose reproduction occurs slowly in natural conditions. Therefore, using tissue culture technique can be a suitable way to increase the multiplication rate of this ornamental plant. Material and methods In this study, a factorial experiment was conducted in a completely randomized design with 5 replications. The effect of different concentrations of BA and Kin (0, 0.5, 1 and 2 mg/L) in combination with 0.1 mg/L NAA on regeneration of different twin scale type of amaryllis was evaluated. Explants were divided as twin scales and classified in 4 groups, so that the outermost twin scales was grouped in class 1 and the innermost twin scales was grouped in class 4. Results The results showed that the diameter of produced bulblet was influenced by the position of the twin scales in the mother bulb. The twin scale group one, which was made from the outer layers of the bulb, produced thicker bulblets, while the twin scales grou...

Effect of Cultivar and Plant Growth Regulators on Invitro Regeneration of Lilium Spp. Utilizing Thin Cell Layer Explants

Majallah-i ̒Ulum-i Bāghbānī, 2018

Introduction: Lily (Lilium spp.) is a genus of herbaceous flowering plants, which consisted of ma... more Introduction: Lily (Lilium spp.) is a genus of herbaceous flowering plants, which consisted of many beautiful ornamental species with large prominent flowers. Most species are native to the Northern hemisphere temperate, though their range extends into the Northern subtropics. Some specific hybrids of Lilium spp. have been developed as cut flower in controlled conditions and in some cases can be grown as pot plant. Propagation rate of lily in natural clonal propagation methods is very low and one year produces of 1-2 bulblets per bulb scale. There is also possibility of disease transmission; so that, tissue culture techniques has provided an efficient method for its micropropagation. Materials and Methods: In this study, two separate experiments under In vitro conditions the bulblet regeneration from thin cell layer (TCL) explants of Lilium spp. was investigated. In the first experiment, after two months the effect of TCL explants with 1, 3 and 5 mm thickness on MS medium containing...

Optimization of Indirect Regeneration in Anthuriumscherzerianum

Majallah-i ̒Ulum-i Bāghbānī, 2017

Introduction: Anthurium is a popular genus of the Araceae (order Spathiflorae).The flower consist... more Introduction: Anthurium is a popular genus of the Araceae (order Spathiflorae).The flower consists of a protruding spadix containing numerous florets, subtended by a brightly colored modified leaf, the spathe. Anthuriums are bisexual and protogynous.Anthuriumscherzerianum as the most important species ofAnthurium genus is a potted perennial plant. Due to having beautiful, attractive and long-life flowers, A. scherzerianum can be used for the production of pot and cut flowers. Tissue culture is suggested as the most commonly method in order to rapid propagation and removing disease in a short period of time. This method also recommended for Anthuriumbecause of problems in classical propagation method of this flower..The three basic propagation methods for Anthuriumare propagation by seed, traditional vegetative and tissue culture.Micropropagation of Anthurium is using forcommercial production. Materials and Methods: In this study, the effect of plant growth regulators and explants on...

Additional file 1: of Efficiency of different strategies to mitigate ascertainment bias when using SNP panels in diversity studies

Zip file containing allele frequency spectrum figures of each population. (ZIP 11230Â kb)

Security Attacks and Solutions On Ubiquitous Computing Networks

40 Abstract— Ubiquitous computing evolved tremendously and became an integral part of many fields... more 40 Abstract— Ubiquitous computing evolved tremendously and became an integral part of many fields and application domains. It not only causes maximized availability for users with wired or wireless networks but also supports any information technology equipment such as cell phones, PDAs, car navigation terminals and consumer information appliances as well as desktop computers and mobile PCs. This new computing paradigm also brings along modern and unique security challenges regarding vulnerabilities and appropriate solutions. Possible solutions for threats of ubiquitous environment to address these security issues are highlighted.

Efficiency of different strategies to mitigate ascertainment bias when using SNP panels in diversity studies

BMC genomics, Jan 5, 2018

Single nucleotide polymorphism (SNP) panels have been widely used to study genomic variations wit... more Single nucleotide polymorphism (SNP) panels have been widely used to study genomic variations within and between populations. Methods of SNP discovery have been a matter of debate for their potential of introducing ascertainment bias, and genetic diversity results obtained from the SNP genotype data can be misleading. We used a total of 42 chicken populations where both individual genotyped array data and pool whole genome resequencing (WGS) data were available. We compared allele frequency distributions and genetic diversity measures (expected heterozygosity (H e ), fixation index (F ST ) values, genetic distances and principal components analysis (PCA)) between the two data types. With the array data, we applied different filtering options (SNPs polymorphic in samples of two Gallus gallus wild populations, linkage disequilibrium (LD) based pruning and minor allele frequency (MAF) filtering, and combinations thereof) to assess their potential to mitigate the ascertainment bias. Rar...

Indirect regeneration from cotyledonary explants of watermelon (Citrullus lanatus) at in vitro culture

International Journal of Advanced Research, 2016

A modified arrangement of multi-prismatic tips on a horizontal sensor for on-the-go measurement of soil mechanical resistance

A study was conducted to investigate a different arrangement of prismatic tips on a tine for on-t... more A study was conducted to investigate a different arrangement of prismatic tips on a tine for on-the-go measuring soil mechanical resistance at various compacted soil layers in the soil bin. In order to do this, four prismatic tips with apex angle of 30º and base area of 323 mm2 were mounted horizontally on a tine face and then connected to load cells. The length of shafts was reduced from top to down the tine. The developed system was evaluated in a controlled soil bin laboratory conditions with clay loam soil and uniform soil moisture content. The experiment was designed with soil compaction at three levels of uniform and three levels of non-uniform in completely randomized block design with four replications. Vertical standard penetrometer was also used to compare with horizontal sensor data at whole working depth of 0 to 400 mm. The results indicated that there was a correlation with R2 = 0.88 between soil cone penetrometer and the horizontal multi-tips sensor data. It can be concluded that the idea of reducing the length of the tips from top to down the tine face would give promising results. Link of the paper: https://www.wflpublisher.com/Abstract/2409

The Effect of Frizzle Gene and Dwarf Gene on Egg Quality of Broiler Breeder Dams Under High and Temperate Ambient Temperature

Physical investigation of the potential of Vis/NIR spectroscopy for fast and non-destructive detection of pesticide residues in agricultural products

In this research, the feasibility of visible/near-infrared (Vis/NIR) spectroscopy for non-destruc... more In this research, the feasibility of visible/near-infrared (Vis/NIR) spectroscopy for non-destructive detection of pesticide residues in agricultural products (a case study on Diazinon in greenhouse cucumber) was physically investigated. To this end, Vis/NIR spectra of Diazinon and cucumber samples without and with different concentrations of pesticide residues were analyzed and interpreted. Results indicated that Vis/NIR spectroscopy have physically the potential for detection of pesticide residue in the product. It was noted that this technique combined with chemometrics methods can be utilized for fast and non-destructive detection of pesticide residues in agricultural products.

Non-destructive measurement of pesticide residues in agricultural products using Vis/NIR spectroscopy and chemometrics

In this research, the feasibility of using visible/near-infrared (Vis/NIR) spectroscopy combined ... more In this research, the feasibility of using visible/near-infrared (Vis/NIR) spectroscopy combined with chemometrics was assessed for measurement of pesticide residues in agricultural products (a case study on Diazinon in greenhouse cucumber). Partial least squares (PLS) regression models were developed based on chemical reference measurements and the spectral information of the samples in 450-1000nm after performing different pre-processing methods. Results indicated that Vis/NIR spectroscopy combined with chemometrics have satisfactorily the potential for fast and non-destructive measurement of Diazinon residue in cucumber samples. Best prediction results were achieved with PLS model developed based on the combination of pre-processing methods of multiplicative scatter correction (MSC) and first derivative (D1) (rcv=0.91, SECV=3.22).

Carnation etched ring virus elimination through shoot tip culture

Carnation etched ring virus (CERV) is the second most destructive virus which infects carnation a... more Carnation etched ring virus (CERV) is the second most destructive virus which infects carnation and the only DNA virus among infecting viruses of carnation. In symptomatic leaves of carnation consist of mottling, necrotic and chlorotic flecks or blotches. Virus was detected by DAS-ELISA and PCR. Treatments consisted of different sizes of meristem and MS medium supplemented with different plant growth regulators (PGRS) (0.5 mg/l benzyl adenine (BA), 0.5 mg/l gibberellic acid (GA3) and medium without PGRS.). The plantlets were analysed by PCR in order to evaluate virus eradication. Results of PCR in vitro culture revealed that explant size and type of PGRS had a significant effect on elimination of CERV and the highest amount of it (100%) was observed on medium containing BA in meristem size of 0.4, 0.7 mm and the lowest amount of it (26%) was occurred on medium supplemented with GA3 in meristem size of 1mm. So far, there is no reporting about influence of PGRS on elimination of viruses.

Optimization of lavender (Lavandula angustifolia) callus culture

Plant Tissue Culture and Biotechnology, 2015

Non-destructive detection of pesticide residues in cucumber using visible/near-infrared spectroscopy

Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment, Jan 19, 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 resi...

Online time-optimal trajectory planning in dynamic workspace of cable suspended robots

2014 Second RSI/ISM International Conference on Robotics and Mechatronics (ICRoM), 2014

This paper presents a method for online trajectory planning of cable suspended robots. A three de... more This paper presents a method for online trajectory planning of cable suspended robots. A three degrees-of-freedom spatial cable robot is studied in this analysis. By deriving dynamic model of the robot, cable force restrictions will induce a set of algebraic inequalities in dynamic equations. Direction of required tracking acceleration reveals feasible motion of the robot, which guarantees non-violation of cable force bilateral bounds. Required tracking acceleration is in the direction of instantaneous minus desired velocity vectors with specified magnitude. Furthermore, alternative recipes are employed to decrease negative impacts of unwanted inputs and applying actuator constraints in trajectory planning. Finally, several simulations are presented to demonstrate success of the method. Proposed approach can be used in online trajectory tracking for all cable-driven parallel suspended robots akin to what is realized for the presented three degrees-of-freedom robot.

Design, Simulation and Construction of Two Synchronized DC Motors' Driver for EVs

International Conference on Mechanical and Electrical Technology 2009 (ICMET 2009)

Electric vehicles (EVs) are simplest way to replace fossil fuel powered vehicles. EVs are relativ... more Electric vehicles (EVs) are simplest way to replace fossil fuel powered vehicles. EVs are relatively cheap, have little environmental impact and are a technology which is available here and now. Using an electronic control board and two power boards, a high power EV drive system was designed and constructed (designed for the vehicles up to 100 kW). The controller uses power IGBT module and microcontroller technology to simultaneously control two DC series motors. The driver controls direction of motion and causes differential speeds of motors relative to steering rod and acceleration pedal position. Driver simulation in MATLAB proved that the required conditions of the problem were satisfied by PID controller; and the optimum values for the control parameters K p , K i and K d were found to be 320, 350 and 40, respectively. The result of simulation for these motors indicated that for start up a high torque is available.

Evaluation of alternative battery technologies for a solar assist plug-in hybrid electric tractor

Transportation Research Part D: Transport and Environment, 2010

This paper looks at the various battery technologies available for use in solar assist plug-in hy... more

3D finite element simulation of a single-tip horizontal penetrometer–soil interaction. Part I: Development of the model and evaluation of the model parameters

Soil and Tillage Research, 2013

ABSTRACT A fundamental step to employing a horizontal penetrometer for on-the-go measurement of s... more ABSTRACT A fundamental step to employing a horizontal penetrometer for on-the-go measurement of soil compaction is to characterize the horizontal penetrometer resistance (PR) as affected by soil mechanical/physical properties and design/operational parameters of the penetrometer. Such complicated soil–tool interactions are preferably investigated using numerical analyses, e.g. finite element (FE) method. A symmetric 3D FE model for a single-tip horizontal penetrometer–soil interaction was developed and evaluated in ABAQUS/Explicit. In the first paper of this study, we focus on the development of the model and the evaluation of some affecting parameters, namely (i) boundary effects, (ii) element size (mesh density) around the conical tip of the penetrometer, (iii) sensitivity of the predicted PR with respect to (a) soil mechanical properties (b) tip extension (i.e. the distance between cone base and shin of the carrying tine), (c) working depth, and (iv) soil layering and the effect of working depth in relation to the tine critical depth. The elastic–plastic parameters of the soil constitutive model (Drucker–Prager) were determined from samples taken within the working depth of the penetrometer in a soil bin. The results showed that for the tested penetrometer dimensions and the given soil specifications (i) the simulated soil box should be at least 0.8 m long and 0.4 m wide to avoid interference from the boundaries on predicted PR; (ii) the element size around the cone should be fine enough (9 mm) for a stable steady-state simulated PR; and (iii) the tip extension must be &gt;4 cm to avoid the effect of tine on PR. PR was found to be most sensitive to soil internal angle of friction and compressive yield stress, whilst Poisson&#39;s ratio had no significant effect, and Young&#39;s modulus of elasticity and soil-metal coefficient of friction showed only minor impacts on PR. Due to soil surcharge, PR increased by 30% when increasing the working depth of the penetrometer from 5 to 40 cm in a homogenous soil profile. An effective radius of 6 cm was found for the soil failure around the cone. The simulations showed that when the cone was located above the tine critical depth (i.e. inside the crescent failure zone), the PR was lower and the PR signal was unstable compared with when the cone worked out of crescent failure zone at the same depth. The model developed here can be used to characterize PR with respect to the state of soil strength/compaction across soil types.

A review of principle and sun-tracking methods for maximizing solar systems output

Renewable and Sustainable Energy Reviews, 2009

Finding energy sources to satisfy the world's growing demand is one of society's foremost challen... more Finding energy sources to satisfy the world's growing demand is one of society's foremost challenges for the next half-century. The challenge in converting sunlight to electricity via photovoltaic solar cells is dramatically reducing $/watt of delivered solar electricity. In this context the sun trackers are such devices for efficiency improvement. The diurnal and seasonal movement of earth affects the radiation intensity on the solar systems. Suntrackers move the solar systems to compensate for these motions, keeping the best orientation relative to the sun. Although using sun-tracker is not essential, its use can boost the collected energy 10-100% in different periods of time and geographical conditions. However, it is not recommended to use tracking system for small solar panels because of high energy losses in the driving systems. It is found that the power consumption by tracking device is 2-3% of the increased energy. In this paper different types of sun-tracking systems are reviewed and their cons and pros are discussed. The most efficient and popular sun-tracking device was found to be in the form of polar-axis and azimuth/elevation types.