Lateral Torsional Buckling Capacity Assessment of Castellated Steel Beams Using Artifi cial Neural Networks

Yasser Sharifi,Mahmoud Hosseinpour,Adel Moghbeli,Hojjat Sharifi 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.5

A new model based on Artifi cial Neural Network (ANN) was established as a trustworthy technique for predicting ultimate lateral torsional buckling (LTB) capacity of castellated steel beams. The required information for training, validating and testing of the developed model obtained from a reliable database. Consequently, a new formulation based on the ANN has been off ered for predicting the failure load of castellated steel beams exposed to LTB. All parameters which may aff ect the LTB capacity of castellated beams were considered for presentation of this formula. Then, outcomes of the proposed formula were compared with predictions of Australian Standard (AS4100) for LTB capacity of castellated beams. This comparison indicated that proposed formula has a good performance for prediction of ultimate strength in castellated beams subjected to LTB. At the end, Garson’s algorithm has been established as a sensitivity analysis to determinate importance of each input in the proposed formula.

Utilization of Waste Glass Micro-particles in Producing Self-Consolidating Concrete Mixtures

Sharifi, Yasser,Afshoon, Iman,Firoozjaei, Zeinab,Momeni, Amin Korea Concrete Institute 2016 International Journal of Concrete Structures and M Vol.10 No.3

The successful completion of the present research would be achieved using ground waste glass (GWG) microparticles in self-consolidating concrete (SCC). Here, the influences of GWG microparticles as cementing material on mechanical and durability response properties of SCC are investigated. The aim of this study is to investigate the hardened mechanical properties, percentage of water absorption, free drying shrinkage, unit weight and Alkali Silica Reaction (ASR) of binary blended concrete with partial replacement of cement by 5, 10, 15, 20, 25 and 30 wt% of GWG microparticles. Besides, slump flow, V-funnel, L-box, J-ring, GTM screen stability, visual stability index (VSI), setting time and air content tests were also performed as workability of fresh concrete indicators. The results show that the workability of fresh concrete was increased by increasing the content of GWG microparticles. The results showed that using GWG microparticles up to maximum replacement of 15 % produces concrete with improved hardened strengths. From the results, when the amount of GWG increased there was a gradual decrease in ASR expansion. Results showed that it is possible to successfully produce SCC with GWG as cementing material in terms of workability, durability and hardened properties.

Dynamic analysis of concrete beams reinforced with Tio₂ nano particles under earthquake load

Sharifi, Morteza,Kolahchi, Reza,Bidgoli, Mahmood Rabani Techno-Press 2018 Wind and Structures, An International Journal (WAS Vol.26 No.1

This research studies the dynamic analysis of a concrete column reinforced with titanium dioxide ($TiO_2$) nanoparticles under earthquake load. The effect of nanoparticles accumulation in a region of concrete column is examined using Mori-Tanaka model. The structure is simulated mathematically based on the theory of sinusoidal shear deformation theory (SSDT). By calculating strain-displacement and stress-strain relations, the system energies include potential energy, kinetic energy, and external works are derived. Then, using the Hamilton's principle, the governing equations for the structure are extracted. Using these equations, the response of the concrete column under earthquake load is investigated using the numerical methods of differential quadrature (DQ) and Newark. The purpose of this study is to study the effects of percentage of nanoparticles, nanoparticles agglomeration, geometric parameters and boundary conditions on the dynamic response of the structure. The results indicate that by increasing the volume percent of $TiO_2$ nanoparticles, the maximum dynamic deflection of the structure decreases.

Roles of the Bcl-2/Bax Ratio, Caspase-8 and 9 in Resistance of Breast Cancer Cells to Paclitaxel

Sharifi, Simin,Barar, Jaleh,Hejazi, Mohammad Saeid,Samadi, Nasser Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.20

The goal of this study was to establish paclitaxel resistant MCF-7 cells, as in vitro model, to identify the molecular mechanisms leading to acquired chemoresistance in breast cancer cells. Resistant cells were developed by stepwise increasing exposure to paclitaxel. Gene expression levels of Bax and Bcl-2 along with protein levels of caspase-8 and caspase-9 were evaluated in two resistant cell lines (MCF-7/Pac64 and MCF-7/Pac5 nM). Morphological modifications in paclitaxel resistance cells were examined by light microscopy and fluorescence activated cell sorting (FACS). As an important indicator of resistance to chemotheraputic agents, the Bcl-2/Bax ratio showed a significant increase in both MCF-7/Pac5nM and MCF-7/Pac 64nM cells (p<0.001), while caspase-9 levels were decreased (p<0.001) and caspase-8 was increased (p<0.001). FACS analysis demonstrated that MCF-7/Pac64 cells were smaller than MCF-7 cells with no difference in their granularity. Our results support the idea that paclitaxel induces apoptosis in a mitochondrial-dependent manner. Identifying breast cancer patients with a higher Bcl-2/Bax ratio and caspase 9 level and then inhibiting the activity of these proteins may improve the efficacy of chemotheraputic agents.

Biogenic Volatile Compounds for Plant Disease Diagnosis and Health Improvement

Sharifi, Rouhallah,Ryu, Choong-Min The Korean Society of Plant Pathology 2018 Plant Pathology Journal Vol.34 No.6

Plants and microorganisms (microbes) use information from chemicals such as volatile compounds to understand their environments. Proficiency in sensing and responding to these infochemicals increases an organism's ecological competence and ability to survive in competitive environments, particularly with regard to plant-pathogen interactions. Plants and microbes acquired the ability to sense and respond to biogenic volatiles during their evolutionary history. However, these signals can only be interpreted by humans through the use of state-of the-art technologies. Newly-developed tools allow microbe-induced plant volatiles to be detected in a rapid, precise, and non-invasive manner to diagnose plant diseases. Beside disease diagnosis, volatile compounds may also be valuable in improving crop productivity in sustainable agriculture. Bacterial volatile compounds (BVCs) have potential for use as a novel plant growth stimulant or as improver of fertilizer efficiency. BVCs can also elicit plant innate immunity against insect pests and microbial pathogens. Research is needed to expand our knowledge of BVCs and to produce BVC-based formulations that can be used practically in the field. Formulation possibilities include encapsulation and sol-gel matrices, which can be used in attract and kill formulations, chemigation, and seed priming. Exploitation of biogenic volatiles will facilitate the development of smart integrated plant management systems for disease control and productivity improvement.

Real-time 14N NQR-based sodium nitrite analysis in a noisy field

Sharifi Mohammad Saleh,송호승,Afarideh Hossein,미트라게게르치,Simiari Mehdi 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.12

Noise and Radio-frequency interference or RFI causes a significant restriction on the Free induction Decay or FID signal detection of the Nuclear Quadrupole Resonance procedure. Therefore, using this method in non-isolated environments such as industry and ports requires extraordinary measures. For this purpose, noise reduction algorithms and increasing signal-to-noise-and-interference ratio or SNIR have been used. In this research, sodium nitrite has been used as a sample and algorithms have been tested in a non-isolated environment. The resonant frequencies for the 150 g of test sample were measured at 303 K at about 1 MHz and 3.4 MHz. The main novelty in this study was, (1) using two types of antennas in the receiver to improve adaptive noise and interference cancellation, (2) using a separate helical antenna in the transmitter to eliminate the duplexer, (3) estimating the noise before sending the pulse to calculate the weighting factors and reduce the noise by adaptive noise cancellation, (3) reject the interference by blanking algorithm, (4) pulse integration in the frequency domain to increase the SNR, and (5) increasing the detection speed by new pulse integration technique. By interference rejection and noise cancellation, the SNIR is improved to 9.24 dB at 1 MHz and to 7.28 dB at 3.4 MHz, and by pulse integration 44.8 dB FID signal amplification is achieved, and the FID signals are detected at 1.057 MHz and 3.402 MHz at room temperature

Revisiting bacterial volatile-mediated plant growth promotion: lessons from the past and objectives for the future

Sharifi, Rouhallah,Ryu, Choong-Min Academic Press [etc.] 2018 Annals of botany Vol. No.

<P><B>Abstract</B></P><P><B>Background</B></P><P>Bacterial volatile compounds (BVCs) are important mediators of beneficial plant–bacteria interactions. BVCs promote above-ground plant growth by stimulating photosynthesis and sugar accumulation and by modulating phytohormone signalling. These compounds also improve below-ground mineral uptake and modify root system architecture.</P><P><B>Scope</B></P><P>We review advances in our understanding of the mode of action and practical applications of BVCs since the discovery of BVC-mediated plant growth promotion in 2003. We also discuss unanswered questions about the identity of plant receptors, the effectiveness of combination of two or more BVCs on plant growth, and the potential side effects of these compounds for human and animal health.</P><P><B>Conclusion</B></P><P>BVCs have good potential for use as biostimulants and protectants to improve plant health. Further advances in the development of suitable technologies and preparing standards and guidelines will help in the application of BVCs in crop protection and health.</P>

Remaining Moment Capacity of Corroded Steel Beams

Yasser Sharifi,Reza Rahgozar 한국강구조학회 2010 International Journal of Steel Structures Vol.10 No.2

Steel structures are subjected to corrosion due to environmental exposure and inadequate maintenance. As a result, the carrying capacity and hence the level of safety of this structures diminishes with time due to accumulation of corrosion damage (e.g. section loss). For the assessment of the remaining moment capacity of corrosion damaged I-beams, two methods have been proposed in this paper based on the thickness loss data were compiled from four corroded damaged I-beams, namely the simple and accurate assessment methods. These methods give the quantitative relationship between the magnitude of structural defects (loss of thickness) and the corresponding remaining moment capacity (expressed as percentage of the as-new strength) of corrosion damaged beams. These methods require only the information regarding thickness loss of the appropriate elements of the members (flanges and web) and the capacity of the beam in its as-new condition, to assess the remaining moment capacity of a corrosion damaged beam. The thickness loss information can be provided by visual inspection or thickness measurement of a member. These assessment methods will help the practicing engineer to make a fast and reliable decision regarding the remaining moment capacity of corrosion damaged I-beam.

Spectral Changes of a Radial Gaussian Schell-model Beam Array Propagating in non-Kolmogorov Turbulence

Mehdi Sharifi,Bin Luo,Anhong Dang,Hong Guo,Guohua Wu 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.10

The Spectral characteristics of a radial Gaussian Schell-model (GSM) beam array propagating innon-Kolmogorov turbulence are investigated theoretically. The spectrum of the GSM beam arrayis shown to be greatly influenced by both the source and the non-Kolmogorov parameters. Theeffects of the propagation distance, the spatial coherence of the source, the ring radius and thebeam number of the array beam, the generalized exponent, and the inner scale parameters of non-Kolmogorov turbulence on the spectrum are studied in detail. The results show that two identicalspectral maxima exist for the normalized on-axis spectrum and a rapid transition in spectrumcan occur when the above-mentioned parameters have specific critical values. The effects of theseparameters on the relative spectral shift are also studied in detail.

Biogenic Volatile Compounds for Plant Disease Diagnosis and Health Improvement

Rouhallah Sharifi,류충민 한국식물병리학회 2018 Plant Pathology Journal Vol.34 No.6

Plants and microorganisms (microbes) use information from chemicals such as volatile compounds to understand their environments. Proficiency in sensing and responding to these infochemicals increases an organism’s ecological competence and ability to survive in competitive environments, particularly with regard to plant-pathogen interactions. Plants and microbes acquired the ability to sense and respond to biogenic volatiles during their evolutionary history. However, these signals can only be interpreted by humans through the use of state-of the-art technologies. Newly-developed tools allow microbe-induced plant volatiles to be detected in a rapid, precise, and non-invasive manner to diagnose plant diseases. Beside disease diagnosis, volatile compounds may also be valuable in improving crop productivity in sustainable agriculture. Bacterial volatile compounds (BVCs) have potential for use as a novel plant growth stimulant or as improver of fertilizer efficiency. BVCs can also elicit plant innate immunity against insect pests and microbial pathogens. Research is needed to expand our knowledge of BVCs and to produce BVC-based formulations that can be used practically in the field. Formulation possibilities include encapsulation and sol-gel matrices, which can be used in attract and kill formulations, chemigation, and seed priming. Exploitation of biogenic volatiles will facilitate the development of smart integrated plant management systems for disease control and productivity improvement.