Silicon carbide (SiC) nanotubes as potential sensors for organophosphate molecules

Keyumars Hassanzadeh,Keivan Akhtari,Bahareh Fakhraei,Ghazal Akhtari,Halaleh Hassanzadeh 한국물리학회 2017 Current Applied Physics Vol.17 No.5

The detection and clean-up of the organophosphate (OP) compounds have special importance for those who work in the field of health and governments due to the bad effects of these compounds on human health. In this paper, we have employed the PBE level of theory and ultrasoft pseudopotentials to investigate the ability of silicon carbide nanotubes (SiCNTs) as sensors for organophosphate detection. We found that the binding energy and charge transfer for adsorption of OP on (6,0) SiCNT represents the formation of a strong bond. However, the DE Gap demonstrates the significant changes (12%) in the electronic properties of (10,0) SiC nanotubes which could induce considerable alteration in the SiCNT electrical conductivity. According to the results, the OP can be adsorbed on SiCNT and these types of nanotubes can be promising candidates for detecting organophosphate compounds. The non-equilibrium Green function (NEGF) method shows good performance for the sensor sensitivity.

Degradation of oxytetracycline by nano zero valent iron under UV-A irradiation: Chemical mechanism and kinetic

Hassanzadeh, Parisa,Ganjidoust, Hossein,Ayati, Bita Techno-Press 2014 Advances in environmental research Vol.3 No.1

Pharmaceutical wastewater effluents are well known for their difficult elimination by traditional biotreatment methods and their important contribution to environmental pollution due to its fluctuating and recalcitrant nature. OTC is one of the nonbiodegradable antibiotics that makes antibiotic-resistant, so it can make be high risk for environment. NZVI can be a good choice for removal of OTC in aqueous solution. Response surface methodology (RSM) was used to optimize the amounts of NZVI and OTC to be used at pH 3 and under 200 W, UV-A irradiation. The responses were removal percent of absorption at 290 and 348 nm, TOC and COD of OTC. In the optimum condition, Linear model was performed 155 ppm of OTC were removed by 1000 ppm NZVI after 6.5 hours and the removal efficiency of absorption at 290 and 348 nm, TOC and COD were 87, 95, 85 and 89 percent, respectively. In the similar process, there is no organic compound after 14 hours. The parameters ORP, DO and pH were investigated for 6:30 hours to study the type of NZVI reaction in process. In the beginning of reaction, oxidation was the dominant reaction after 3 hours, photocatalytic reaction was remarkable. The mechanism of OTC degradation is proposed by HPLC/ESI-MS and four by products were found. Also the rate constants (first order kinetic chain reaction model) were 0.0099, 0.0021, 0.0010, 0.0049 and $0.0074min^{-1}$, respectively.

Impacts of Demand Response from Different Sectors on Generation System Well Being

Hassanzadeh, Muhammad Naseh,Fotuhi-Firuzabad, Mahmud,Safdarian, Amir The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.5

Recent concerns about environmental conditions have triggered the growing interest in using green energy resources. These sources of energy, however, bring new challenges mainly due to their uncertainty and intermittency. In order to alleviate the concerns on the penetration of intermittent energy resources, this paper investigates impacts of realizing demand-side potentials. Among different demand-side management programs, this paper considers demand response wherein consumers change their consumption pattern in response to changing prices. The research studies demand response potentials from different load sectors on generation system well-being. Consumers' sensitivity to time-varying prices is captured via self and cross elasticity coefficients. In the calculation of well-being indices, sequential Monte Carlo simulation approach is accompanied with fuzzy logic. Finally, IEEE-RTS is used as the test bed to conduct several simulations and the associated results are thoroughly discussed.

Numerical simulation for unsteady flow over marine current turbine rotors

Hassanzadeh, A. Reza,Yaakob, Omar bin,Ahmed, Yasser M.,Ismail, M. Arif Techno-Press 2016 Wind and Structures, An International Journal (WAS Vol.23 No.4

The numerous benefits of Savonius turbine such as simple in structure, has appropriate self-start ability, relatively low operating velocity, water acceptance from any direction and low environmental impact have generated interests among researchers. However, it suffers from a lower efficiency compared to other types of water turbine. To improve its performance, parameters such flow pattern, pressure and velocity in different conditions must be analyzed. For this purpose, a detailed description on the flow field of various types of Savonius rotors is required. This article presents a numerical study on a nonlinear two-dimensional flow over a classic Savonius type rotor and a Benesh type rotor. In this experiment, sliding mesh was used for solving the motion of the bucket. The unsteady Reynolds averaged Navier-Stokes equations were solved for velocity and pressure coupling by using the SIMPLE (Semi-Implicit Method for Pressure linked Equations) algorithm. Other than that, the turbulence model using $k-{\varepsilon}$ standard obtained good results. This simulation demonstrated the method of the flow field characteristics, the behavior of velocity vectors and pressure distribution contours in and around the areas of the bucket.

ENVELOPES OF SUBMODULES

Hassanzadeh-lelekaami, Dawood The Honam Mathematical Society 2017 호남수학학술지 Vol.39 No.4

We introduce and investigate envelope of submodules. We show that the proper envelopes of certain submodules is a union of prime submodules.

TOPOLOGICAL DIMENSION OF PSEUDO-PRIME SPECTRUM OF MODULES

Hassanzadeh-Lelekaami, Dawood,Roshan-Shekalgourabi, Hajar Korean Mathematical Society 2017 대한수학회논문집 Vol.32 No.3

Different topological dimensions related to the pseudo-prime spectrum of topological modules are studied. An example of topological modules is introduced. Also, we give a result about Noetherianness of the pseudo-prime spectrum of topological modules.

Prey preference and prey switching in Anthocoris minki Dohrn (Hemiptera: Anthocoridae)

Maryam Hassanzadeh-Avval,Hussein Sadeghi-Namaghi,Lida Fekrat 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.4

The understanding of host specificity of predacious insects is one of the most important problems in the investigation of biological control. Prey preference and the potential for prey switching in Anthocoris minki Dohrn (Hem.: Anthocoridae) was assessed in two- choice experiments under environmentally controlled conditions. Manly's preference index was used to compare A. minki predation on Agonoscena pistaciae Burckhardt and Lauterer (Hem.: Psyllidae) versus Psyllopsis repens Loginova (Hem.: Psyllidae) but showed no statistically significant evidence for preference. Anthocoris minki did prefer psyllids (Agonoscena pistaciae and Psyllopsis repens) over aphids (Forda hirsuta Mordvilko (Hem.: Pemphigidae) and Aphis craccivora Koch (Hem.: Aphididae)). The predator also consumed significantly more 2nd instar than 4th instar nymphs of P. repens. Switching behavior experiments showed that A. minki did not preferentially attack the most abundant prey when the prey combination was either biased toward A. pistaciae or toward F. hirsuta. Linear regression between preference indices and prey ratios indicated an overall preference for psyllids over aphids. The results suggest that a psyllid-specialized feeder such as A. minki is more likely to be effective biocontrol agent against psyllid species and less effective at reducing the numbers of other pest species that might co-occur with psyllids.

Effect of the Copolymerized Aromatic and Unsaturated Monomers on the Affinity of Drug-Polyesters in the Core-Shell Nanoparticles

Salman Hassanzadeh,Sepideh Khoee,Loghman Firoozpour 한국고분자학회 2013 Macromolecular Research Vol.21 No.1

The objective of this study was to get an insight into the influence of the newly provided functional groups from the copolymerization as a strategy on the total interactions of the hydrophobic drug and the polyesteric core of the prepared core-shell nanoparticles. Three amphiphile triblock models of monomethoxy poly(ethylene gycol)(mPEG)-b-polyester-b-mPEG with the same PEG hydrophile part but different hydrophobe polyesteric segments were synthesized and used for preparation of the core-shell nanoparticles that were loaded by quercetin as a model hydrophobe drug in the core. The total amount of the interaction between polyesters in the core and loaded quercetin were monitored by parameters such as drug loadings, in vitro release rates and other newly defined parameters such as micelle encapsulation efficiency. The results highlighted that changing the structure of the saturated aliphatic polyesteric core in the poly(butylene adipate) with diol monomers that are capable of forming additional π stacking and π -OH interactions with quercetin weakens the optimal conditions for the main drug-esteric hydrogen bonding. Therefore, the decreased total affinity of the quercetin and polyesteric core finally resulted in the lower amount of encapsulated drug and the increased release rate.

A new statistical view to modeling of particle residence time distribution in full-scale overflow ball mill operating in closed-circuit

Ahmad Hassanzadeh 한국자원공학회 2018 Geosystem engineering Vol.21 No.4

In the present study, residence time distribution (RTD) of an industrial ball mill operating in closed-circuit with hydrocyclones was measured. Several probability distribution functions (PDFs) constituting exponential, Weibull, Gamma, logistic, normal, and lognormal were applied to obtained RTD results and evaluated based on Anderson-Darling statistic (AD) and associated p-value indices. In addition, three most common empirical RTD models (i.e., perfect mixer, N-Mixer and Weller) were fitted to the given practical data. Aside from assessment of coefficient determination (R 2) for each model, a factor of incorporating the number of model parameters was considered using Bayesian information criterion, low of iterated logarithm criterion and Akaike information criterion. It was revealed that Weibull PDF is fitted reasonably well to the measured experimental data compared with the other PDFs. Despite the relative variance (σ 2) of N-Mixer model was slightly less than the corresponded value of Weller model, the goodness of fit criterion (R 2) and all four information criteria (IC) showed better results for Weller model. Therefore, one large with two small tanks in series along with a dead time was selected as the best model from the statistical point of view. Finally, it was concluded that the RTD models must be evaluated not only on the basis of goodness of fit but also the number of model parameters should be taken into account.

Large eddy simulation of flow around two side-by-side spheres

Rahim Hassanzadeh,Besir Sahin,Muammer Ozgoren 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.7

Large eddy simulation, using a dynamic Smagorinsky sub-grid scale, is used for the prediction of flow structures around two identical spheres fixed side-by-side at a subcritical flow regime with the Reynolds number equal to 5,000. The QUICK discretization method is applied to discretize the convection terms of the Navier-Stokes equation by means of the finite volume approach. This work focuses mainly on the wake structures downstream of the two interactive spheres located at three various dimensionless separation distances between spheres such as G/D = 1.50, 2.00, and 3.00. The obtained results revealed that the interaction between wakes affects the flow structures downstream of spheres. The rate of this interaction is strongly altered as a function of separation distance. On the other hand,some flow data such as mean drag and mean lift coefficients are affected due to the wake interactions. Finally, examination of the Reynolds stress variation along the different lateral axis, L/D, revealed that the nozzle effect does not play a significant role on the turbulence characteristics beyond the G/D = 3.00.