Nanostructured Metal Organic Framework Modified Glassy Carbon Electrode as a High Efficient Non-Enzymatic Amperometric Sensor for Electrochemical Detection of H₂O₂

Naseri, Maryam,Fotouhi, Lida,Ehsani, Ali The Korean Electrochemical Society 2018 Journal of electrochemical science and technology Vol.9 No.1

Metal-organic frameworks have recently been considered very promising modifiers in electrochemical analysis due to their unique characteristics among which tunable pore sizes, crystalline ordered structures, large surface areas and chemical tenability are worth noting. In the present research, $Cu(btec)_{0.5}DMF$ was electrodeposited on the surface of glassy carbon electrode at room temperature under cathodic potential and was initially used as the active materials for the detection of $H_2O_2$. The cyclic voltammogram of $Cu(btec)_{0.5}DMF$ modified GC electrode shows distinct redox peaks potentials at +0.002 and +0.212 V in 0.1 M phosphate buffer solution (pH 6.5) corresponding to $Cu^{(II)}/Cu^{(I)}$ in $Cu(btec)_{0.5}DMF$. Acting as the electrode materials of a non-enzymatic $H_2O_2$ biosensor, the $Cu(btec)_{0.5}DMF$ brings about a promising electrocatalytic performance. The high electrocatalytic activity of the $Cu(btec)_{0.5}DMF$ modified GC electrode is demonstrated by the amperometric response towards $H_2O_2$ reduction with a wide linear range from $5{\mu}M$ to $8000{\mu}M$, a low detection limit of $0.865{\mu}M$, good stability and high selectivity at an applied potential of -0.2 V, which was higher than some $H_2O_2$ biosensors.

Investigating of the effect of composite and welded connections on the cyclic behavior of steel bridges

Naseri, Ali,Roshan, Alireza Mirzagoltabar,Sabzevari, Asghar Techno-Press 2021 Coupled systems mechanics Vol.10 No.5

Connections play a significant role on the seismic performance of structures subjected to gravity and lateral loads. One of the most important strategies for plastic hinge transfer is the strengthening of connections. Composite and welded connections are commonly used in steel bridges. Each of these connections can affect the structural response to lateral loads such as cyclic loads. In this study, four steel bridge models with different types of connections, including composite and welded connections, are created in the finite element (FE) platform ABAQUS. After validation of a FE model using available experimental data, cyclic loading has been employed according to the load history proposed by Scientific Advisory Committee (SAC). The results indicate that using composite connections can increase shear capacity and improve ductility of the system. Also using composite connection can transfer stress concentrated from connection to other areas.

Frequency of K-RAS and N-RAS Gene Mutations in Colorectal Cancers in Southeastern Iran

Naseri, Mohsen,Sebzari, Ahmadreza,Haghighi, Fatemeh,Hajipoor, Fatemeh,Razavi, Fariba Emadian Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.9

Background: K-RAS and N-RAS gene mutations cause resistance to treatment in patients with colorectal cancer. Based on this, awareness of mutation of these genes is considered a clinically important step towards better diagnosis and appropriate treatment. Materials and Methods: Fifty paraffin-embedded blocks of colorectal cancer were obtained from Imam Reza Hospital of Birjand, Iran. Following DNA extraction, the samples were analyzed for common mutations of exons 2, 3 and 4 of KRAS and NRAS genes using real time PCR and pyrosequencing. Results: According to this study, the prevalence of mutations was respectively 28% (14 out of 50) and 2% (1 out of 50) in KRAS and NRAS genes. All the mutations were observed in patients >50 years old. Conclusions: Mutations were found in both KRAS and NRAS genes in colorectal cancers in Iranian patients. Determining the frequency of these mutations in each geographical region may be necessary to benefit from targeted cancer therapy.

Probabilistic seismic assessment of RC box-girder bridges retrofitted with FRP and steel jacketing

Naseri, Ali,Roshan, Alireza Mirzagoltabar,Pahlavan, Hossein,Amiri, Gholamreza Ghodrati Techno-Press 2020 Coupled systems mechanics Vol.9 No.4

Due to susceptibility of bridges in the past earthquakes, vulnerability assessment and strengthening of bridges has gained a particular significance. The objective of the present study is to employ an analytical method for the development of fragility curves, as well as to investigate the effect of strengthening on the RC box-girder bridges. Since fragility curves are used for pre-and post-earthquake planning, this paper has attempted to adopt the most reliable modeling assumptions in order to increase the reliability. Furthermore, to acknowledge the interaction of soil, abutment and pile, the effect of different strengthening methods, such as using steel jacketing and FRP layers, the effect of increase in the bridge pier diameter, and the effect of vertical component of earthquake on the vulnerability of bridges in this study, a three-span RC box-girder bridge was modeled in 9 different cases. Nonlinear dynamic analyses were carried out on the studied bridges subjected to 100 ground motion records via OpenSEES platform. Therefore, the fragility curves were plotted and compared in the four damage states. The results revealed that once the interaction of soil and abutment and the vertical component of the earthquake are accounted for in the calculations, the median fragility is reduced, implying that the bridge becomes more vulnerable. It was also confirmed that steel jackets and FRP layers are suitable methods for pier strengthening which reduces the vulnerability of the bridge.

To What Extent Can Surface Morphology Influence the Photoelectrochemical Performance of Au:WO₃ Electrodes?

Naseri, N.,Qorbani, M.,Kim, H.,Choi, W.,Moshfegh, A. Z. American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.3

<P>Considering hydrogen as a future fuel, development of clean energy sources based on solar power is the main human challenge in recent years. Here, for the first time, Au:WO<SUB>3</SUB> photoanodes are synthesized with different Au concentrations and then applied for photoelectrochemical (PEC) water splitting. A comprehensive statistical study on the prepared photoanode surface is conducted to understand the correlation between surface morphology and PEC activity, using atomic force microscopy (AFM). The results clearly justified the maximum surface area observed for the film containing 1 mol % Au. Additionally, X-ray diffraction (XRD) analysis determined that Au nanocrystals have been formed in cubic structure with the size of 29–52 nm. X-ray photoelectron spectroscopy (XPS) revealed that the presence of Au in a combined metal/oxide state strongly affects on the Au:WO<SUB>3</SUB> photoanode performance. Photoresponse investigation of the synthesized films showed that the highest photocurrent was obtained for the sample containing 1 mol % gold with the maximum incident photon to current efficiency (IPCE) of about 20% at 360 nm wavelength. In addition, measuring the amount of hydrogen produced in the water splitting reaction supports the result that the sample containing 1 mol % Au exhibits the highest hydrogen production rate (∼3 μmol/h) as compared to other samples.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2015/jpccck.2015.119.issue-3/jp507988c/production/images/medium/jp-2014-07988c_0011.gif'></P>

Effects of curvature radius on vulnerability of curved bridges subjected to near and far-field strong ground motions

Naseri, Ali,Roshan, Alireza MirzaGoltabar,Pahlavan, Hossein,Amiri, Gholamreza Ghodrati Techno-Press 2020 Structural monitoring and maintenance Vol.7 No.4

The specific characteristics of near-field earthquake records can lead to different dynamic responses of bridges compared to far-field records. However, the effect of near-field strong ground motion has often been neglected in the seismic performance assessment of the bridges. Furthermore, damage to horizontally curved multi-frame RC box-girder bridges in the past earthquakes has intensified the potential of seismic vulnerability of these structures due to their distinctive dynamic behavior. Based on the nonlinear time history analyses in OpenSEES, this article, assesses the effects of near-field versus far-field earthquakes on the seismic performance of horizontally curved multi-frame RC box-girder bridges by accounting the vertical component of the earthquake records. Analytical seismic fragility curves have been derived thru considering uncertainties in the earthquake records, material and geometric properties of bridges. The findings indicate that near-field effects reasonably increase the seismic vulnerability in this bridge sub-class. The results pave the way for future regional risk assessments regarding the importance of either including or excluding near-field effects on the seismic performance of horizontally curved bridges.

How morphological surface parameters are correlated with electrocatalytic performance of cobalt-based nanostructures

Naimeh Naseri,Ştefan Ţălu,Slawomir Kulesza,Shervin Qarechalloo,Amine Achour,Miroslaw Bramowicz,Atefeh Ghaderi,Shahram Solaymani 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-

To overcome recent energy and environment challenges, developing efficient and low cost photocatalystsare unavoidable. In this context, design of semiconductor nanostructures modified with earth abundantco-catalysts for water splitting reactions requires well engineered and controlled process to optimizesurface interface and maximize nanocomposite system efficiency. Here, TiO2 nanotube were synthesizedelectrochemically and decorated with cobalt based nanostructure co-catalyst for water oxidationreaction using low cost and scalable electro-deposition approach. By changing deposition parametersand complete studying on samples surface morphology and related statistical analysis data, correlationbetween all morphological parameters and photoelectrochamical activity of correspondence photo-anode was illustrated for thefirst time. Based on SEM analysis and surface analysis data as well ascatalytic performance investigation, nanotubes decorated with Co nanoparticles at 0.1 mA cm 2deposited for 2000 s presented the best performance with most isotropic surface. Results suggestedthat by tuning deposition parameters surface structural parameters like fractal dimension, cornerfrequency, roughness and feature shape and size can be engineered completely. Moreover, X-raydiffraction data along with Rietveld method revealed coexistence of anatase, rutile and Ti2O3 phases inthe photoanode while poor crystallinity of grown cobalt based nanostructures was confirmed.

Effect of Motor Imagery on the F-Wave Parameters in Hemiparetic Stroke Survivors

Mahshid Naseri,Peyman Petramfar,Alireza Ashraf 대한재활의학회 2015 Annals of Rehabilitation Medicine Vol.39 No.3

Objective To assess the effect of motor imagery, as a rehabilitation method in stroke, on F-wave parameters that undergo changes during upper motor neuron involvement. Methods Twenty-one fully conscious hemiparetic stroke survivors with a completely plegic hand (power 0/5) and a minimum interval of 72 hours since stroke were recruited into this study. The mean F-wave latency, amplitude, and persistence in the median and ulnar nerves were measured in both the affected and non-affected sides at rest and in the paretic hand during a mental task. Comparison was made between data from the affected hand and the non-affected hand as well as between data from the affected hand at baseline and during motor imagery. Results Patients had significantly different F-wave persistence between the affected and non-affected sides (paired t-test, p<0.001). Motor imagery could improve F-wave persistence in both the investigated nerves (paired t-test, p=0.01 for ulnar nerve and p<0.001 for median nerve) and F-response amplitude in the median nerve (paired t-test, p=0.01) of the affected limb. Conclusion The amplitude and persistence of F-wave were improved during motor imagery, representing F-wave facilitation. This result suggests that motor imagery can restore motor neuron excitability, which is depressed after stroke.

Synthesis and gas transport performance of MIL-101/Matrimid mixed matrix membranes

Masoomeh Naseri,Toraj Mohammadi,Seyed Foad Mousavi,Omid Bakhtiari 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-

Mixed matrix membranes (MMMs) are composites of highly selective fillers within a polymeric matrix,resulting in higher selectivity and/or flux in gas separation applications. In this work, micron sized MIL-101 crystals with potential of gas separation by adsorption were synthesized and used as filler for thepreparation of MMMs for gas separation. Gas adsorption measurements were performed for CO2, CH4and N2 using MIL-101 crystals and the results showed significant adsorption of CO2 compared with thetwo other gases at different pressures. SEM images and XRD analysis were used to characterize the fillerparticles and the synthesized membranes. MIL-101/Matrimid MMMs were synthesized with up to30 wt.% loading of filler particles. SEM images showed good dispersion of the particles in the polymericmatrix and also good adhesion between the filler particles and the polymer. Permeability measurementswere performed for pure gases of CO2, CH4 and N2 and the results showed improved CO2/CH4 and CO2/N2ideal selectivities for the MMMs compared with those for the neat Matrimid membrane. For the MMMswith 10 wt.% loading, permeability of CO2 was found as 6.95 Barrer and ideal selectivities for CO2/CH4and CO2/N2 were as 55.77 and 52.92, respectively.

A numerical study on the seismic behavior of a composite shear wall

Reza Naseri,Kiachehr Behfarnia 사단법인 한국계산역학회 2018 Computers and Concrete, An International Journal Vol.22 No.3

Shear walls are one of the important structural elements for bearing loads imposed on buildings due to winds and earthquakes. Composite shear walls with high lateral resistance, and high energy dissipation capacity are considered as a lateral load system in such buildings. In this paper, a composite shear wall consisting of steel faceplates, infill concrete and tie bars which tied steel faceplates together, and concrete filled steel tubular (CFST) as boundary columns, was modeled numerically. Test results were compared with the existing experimental results in order to validate the proposed numerical model. Then, the effects of some parameters on the behavior of the composite shear wall were studied; so, the diameter and spacing of tie bars, thickness and compressive strength of infill concrete, thickness of steel faceplates, and the effect of strengthening the bottom region of the wall were considered. The seismic behavior of the modeled composite shear wall was evaluated in terms of stiffness, ductility, lateral strength, and energy dissipation capacity. The results of the study showed that the diameter of tie bars had a trivial effect on the performance of the composite shear wall, but increasing the tie bars spacing decreased ductility. Studying the effect of infill concrete thickness, concrete compressive strength, and thickness of steel faceplates also showed that the main role of infill concrete was to prevent buckling of steel faceplates. Also, by strengthening the bottom region of the wall, as long as the strengthened part did not provide a support performance for the upper part, the behavior of the composite shear wall was improved; otherwise, ductility of the wall could be reduced severely.