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Investigation of the Progressive Collapse in a Suspension Bridge Under the Explosive Load
Salar Farahmand-Tabar,Majid Barghian,Majid Vahabzadeh 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.6
Progressive collapse is a continuous spread of initial local failure from one member to another one, fi nally causing the collapse of the structure entirely or a disproportionately large part of it. This disproportionate collapse is due to the small initial local failure induced by unpredicted attacks, exhibiting that the structural system cannot resist the development of damage due to the insuffi cient load carrying capacity. In this study, a typical suspension bridge was modeled and analyzed under explosion load. For this purpose, diff erent scenarios were investigated. Forces and moments of the superstructure, responses and the stability of the structure under the applied loads were studied. Explosion applied on the structure depends on the amount of the load and local eff ects. Also, by removing one or several elements of structures, the force is distributed in the whole structure. For loading rate on diff erent positions of the structure, it was observed that the critical position would be under the explosion and towers adjacent. Towers adjacent and the middle of the deck were prone to the maximum infl uences where should be put more attention on and be reinforced to preserve the structure from the total and local failure.
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Saeed Mahmoodi Tabar,Ali Tehranifar,Gholam Hossein Davarynejad,Seyed Hossein Nemati,Hamid Reza Zabihi 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.4
Aril paleness disorder causes the quality depletion of pomegranate fruits. The objective of our work was to determine circumstance of physicochemical changes during the exposure of aril paleness disorder. Disordered fruits were monitored in the 131st days of fruit set. Disordered fruits showed a significant (P ≤ 0.05) difference from intact fruits in fruit density, juice percentage, phenolic compounds, polymeric anthocyanins, titratable acidity, and total soluble solids in the 131st days of fruit set. The fruit density, juice percent, ascorbic acid, phenolic compounds, and titratable acidity decreased 2.91, 13.52, 27.46, 21.48, and 4.22%, respectively, faster than those in intact fruits. Peel percent, dry matter of juice, acidity, total soluble solids and total sugars increased 2.59, 8.13, 3.67, 5.7, and 4.85%, respectively, faster than those in intact fruits. Monomeric anthocyanins increased (200 ㎎/100 g) up to the 159th days of fruit set in intact fruits, followed by decreased 16% up to the 173rd days of fruit set. Disordered fruits showed 70% depletion in monomeric anthocyanins up to the 173rd days of fruit set. Polymeric anthocyanins increased 14.3 and 59.3% in intact fruits and disordered fruits, 14.3 and 59.3%, respectively. Both intact and disordered fruits showed 21.9 and 23.162% increase in protein up to the 159th days of fruit set, followed by a steady state in their rate of accumulation. Physical and chemical properties in both fruits showed no significant changes during the late harvest date (the 166th and 173rd days of fruit set). Exceptions to this general pattern were total soluble solids and dry matter of disordered fruit juice in which increased significantly.
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The Results of a Breast Cancer Screening Camp at a District Level in Rural India
Reddy, Neha,Ninan, Tilu,Tabar, Laszlo,Bevers, Therese Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.12
Background: Breast cancer in developing countries is on the rise. There are currently no guidelines to screen women at risk in India. Since mammography in the western world is a well-accepted screening tool to prevent late presentation of breast cancer and improve mortality, it is intuitive to adopt mammography as a screening tool of choice. However, it is expensive and fraught with logistical issues in developing countries like India. Materials and Methods: Our breast cancer screening camp was done at a local district hospital in India after approval from the director and administrators. After initial training of local health care workers, a one-day camp was held. Clinical breast examination, mammograms, as well as diagnostic evaluation with ultrasound and fine needle aspiration biopsy were utilized. Results: Out of total 68 women screened only 2 women with previous history of breast cancer were diagnosed with breast cancer recurrence. None of the women in other groups were diagnosed with breast cancer despite suspicious lesions either on clinical exam, mammogram or ultrasound. Most suspicious lesions were fibroadenomas. The average cost of screening women who underwent mammography, ultrasound and fine needle aspiration was $30 dollars, whereas it was $16 in women who had simple clinical breast examination. Conclusions: Local camps act as catalysts for women to seek medical attention or discuss with local health care workers concerns of discovering new lumps or developing breast symptoms. Our camp did diagnose recurrence of breast cancer in two previously treated breast cancer patients, who were promptly referred to a regional cancer hospital. Further studies are needed in countries like India to identify the best screening tool to decrease the presentation of breast cancer in advanced stages and to reduce mortality.
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Observation of fluid layering and reverse motion in double-walled carbon nanotubes
K. Yaghmaei,H. Rafii-Tabar 한국물리학회 2009 Current Applied Physics Vol.9 No.6
Most modelling-based research in the field of carbon nanotube-related nano-fluidics has been concerned with the fluid flow in single-walled carbon nanotubes (SWCNTs), showing that the dynamics of the channel affect the structure and behaviour of the fluid. We have extended this work by modelling the flow of Ar in a double-walled carbon nanotube, and have modelled the flow in both the inner shell and the outer annular region of such a nanotube. We have found that the flows in these channels are strongly correlated, such that the fluid moves in opposite directions in these two regions. This phenomenon can give rise to a circulatory motion which can be exploited in nano-fluidic devices. Fluid layering phenomenon, that is usually associated with the flow of fluids in nano-scale channels, is also observed. Furthermore, we have also found that the fluid velocity in dynamic channels is smaller than in static channels, in line with the findings reported for single-walled carbon nanotubes. Most modelling-based research in the field of carbon nanotube-related nano-fluidics has been concerned with the fluid flow in single-walled carbon nanotubes (SWCNTs), showing that the dynamics of the channel affect the structure and behaviour of the fluid. We have extended this work by modelling the flow of Ar in a double-walled carbon nanotube, and have modelled the flow in both the inner shell and the outer annular region of such a nanotube. We have found that the flows in these channels are strongly correlated, such that the fluid moves in opposite directions in these two regions. This phenomenon can give rise to a circulatory motion which can be exploited in nano-fluidic devices. Fluid layering phenomenon, that is usually associated with the flow of fluids in nano-scale channels, is also observed. Furthermore, we have also found that the fluid velocity in dynamic channels is smaller than in static channels, in line with the findings reported for single-walled carbon nanotubes.
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Investigation of major parameters affecting instability of steel beams with RBS moment connections
A. Deylami,A. Moslehi Tabar 국제구조공학회 2006 Steel and Composite Structures, An International J Vol.6 No.3
One of the most promising ways through which a steel moment frame may attain high energy dissipating capability is to trim off a portion of the beam flanges near the column face. This type of moment connection, known as Reduced Beam Section (RBS) connection, has notable superiority in comparison with other moment connection types. As the result of the advantages of RBS moment connection, it has widely being used in practice. In spite of the good hysteretic behaviour, an RBS beam suffers from an undesirable drawback, which is local and lateral instability of the beam. The instability in the RBS beam reduces beam load-carrying capacity. This paper aims to investigate key issues influencing cyclic behaviour of RBS beams. To this end, a numerical analysis was conducted on a series of steel subassemblies with various geometric properties. The obtained results together with the existing experimental data are used to study the instability of RBS beams. A new slenderness concept is presented to control an RBS beam for combined local and lateral instability. This concept is in good agreement with the numerical and experimental results. Finally, a model is developed for the prediction of the magnitude of moment degradation owing to the instability of an RBS beam.
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Ali Tehranifar,Saeed Mahmoodi Tabar 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.3
The aim of this work was to evaluate the effects of different concentrations of K and B foliar application on fruit quality parameters of pomegranate fruit (Punica granatum). To achieve this objective, in 2007 a trial was carried out in a pomegranate orchard located in Ferdows region, Iran. The plants were sprayed with three K (0, 1.5, and 3 gㆍL?¹ potassium metalosate) and three B (0, 1.5, and 3 gㆍL?¹ H3BO3) concentrations, in a complete randomized design with three replications; spraying was replicated three times during fruit development stage. Foliar application of K and B significantly increased the content of K and B in the leaf (P ≤ 0.01), and peel and juice of fruit (P ≤ 0.05). The fruits of trees fertilized at the highest K concentration had higher titratable acidity and total soluble solids than those in the other treatments. Foliar K application at 1.5 and 3 gㆍL?¹ significantly (P ≤ 0.05) increased the content of anthocyanins, phenolic compounds, and antioxidant activity of fruit juice. Application of K at 3 gㆍL?¹ alone decreased the fruit firmness significantly, while the spraying of B at 3 gㆍL?¹ increased the fruit firmness significantly. Content of ascorbic acid increased significantly with increasing of K concentrations and the highest content of ascorbic acid observed in the treatment of combination of K and B at high concentration. Foliar B application significantly (P ≤ 0.05) increased the peel percentage of fruits, while it decreased significantly (P ≤ 0.05) the juice percentage. K application at 3 gㆍL?¹ alone and with combination of B applications showed the highest significant content of total sugar content. Electrolyte leakage of fruit peel decreased significantly (P ≤ 0.05) by foliar K application compared with no K fertilizer application.
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Naeemeh Zari,Jalal Hassan,Kourosh Tabar-Heydar,Seyyed Hamid Ahmadi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.86 No.-
An extraction method employing dispersive liquid–liquid microextraction (DLLME) and ICP-OES hasbeen developed for rapid separation, pre-concentration and determination of ultra-trace amount of Au(III). The extraction of the analyte was performed in the presence of a quaternary ammonium cation, NMethyl-N, N, N-trioctylammonium chloride, (Aliquat 336) as an extractant based on ion-associationextraction system.1-octanol and acetonitrile were used as extraction and disperser solvents, respectively. The variables affecting the extraction conditions were optimized. Calibration curve in the range of 0.3–100 ng mL 1, the detection limit of 0.09 ng mL 1, enrichment factor of 150 and extraction recovery of 74%were obtained. The precision (R.S.D. %) of the method was 6% for 5 replicates and recoveries of 10 ng mL 1Au(III). The combined DLLME method with ICP-OES can readily determine Au(III) at trace (mg L 1) levelusing only 10 mL of sample solution (tap, lake, and mining water) and ore sample without interference bythe matrices. This methodology is simple, fast, and low cost which can be used in routine analyticallaboratories.
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Neurophysiological Effect of External Electromagnetic Field: A Computational Modeling
Tahereh Tekieh,Pezhman Sasanpour,Hashem Ra¯i-Tabar 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.10
The effect of an alternating external field on the pattern of an axon's action potential and its propagation has been investigated by incorporating the effect of an alternating electric field in the nonlinear Hodgkin–Huxley cable model. The results illustrate that for a wide range of frequencies, the applied field is capable of stimulating the resting potential of the membrane. In addition to hyper-polarization state of the neuron which is inevitable for certain values of the electric field amplitude, there will be additional effects on the propagation of action potentials in the neuron. We have also studied the action potentials velocity and amplitude change in the presence of the external field while the fiber is firing. The initiation of action potential for an axon at rest exposed to external field is possible and during the firing of the neuron and under the influence of the external field, it will act as a velocity modifier, and the neuron will lower the amplitude of the action potentials.
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