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Effect of recycled glass powder on asphalt concrete modification
M. Pourabbas Bilondi,S.M. Marandi,F. Ghasemi 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.59 No.2
During recent years researchers performed large effort to increase the service life and asphalt stability of the roads against traffic loads and weather conditions. Investigations carried out in various aspects such as changes in gradation, addition of various additives, changes in asphalt textures and etc. The objective of this research is to evaluate the advantages of adding recycled glass powder (RGP), Crumb Rubber (CR), styrene-butadiene rubber (SBR) and styrene butadiene styrene (SBS) to base bitumen with grade of 60/70 for modification of asphalt concrete. Initial studies conducted for determining the physical properties of bitumen and modifiers. A series of asphalt concrete samples made using various combinations of RGP, CR, SBR, SBS and base bitumen. All samples tested using Indirect Tensile Strength (ITS), Indirect Tensile Strength Modulus (ITSM) and Marshall Stability Tests. The new data compared with the results of control samples. The results showed that replacing RGP with known polymers improved ITS and ITSM results considerably. Also the Marshall Stability of modified mixtures using RGP is more than what is found for the base blend. Ultimately, the new RGP modifier had a huge impact on pavement performance and results in high flexibility which can be concluded as high service life for the new modified asphalt concrete.
Evaluation of Bone Mineral Status in Adolescent Idiopathic Scoliosis
Babak Pourabbas Tahvildari,Mohammad-Ali Erfani,Hormoz Nouraei,Mohammad Sadeghian 대한정형외과학회 2014 Clinics in Orthopedic Surgery Vol.6 No.2
Background: Several reports have suggested low bone mineral density (BMD) in patients with adolescent idiopathic scoliosis (AIS). We determined bone mineral status in patients with AIS to evaluate the effect of brace treatment on BMD. Methods: BMD was measured in 46 patients (mean age, 17.8 ± 4.9 years) with AIS (17 with brace and 29 without brace) by dual-energy X-ray absorptiometry scan and compared the results to an age-matched (mean age, 16.6 ± 3.9 years) control group (n = 54). Results: The AIS group had significantly lower bone mass at the lumbar spine (Z-score, –1.500 vs. –0.832) and hip (Z-score, –1.221 vs. –0.754) except at the femoral neck. No difference in BMD was found between patients with AIS who used a brace and those who did not. Conclusions: The results confirmed that BMD was low in AIS patients and it was not affected by brace treatment
The Leavitt Path Algebras of Ultragraphs
Imanfar, Mostafa,Pourabbas, Abdolrasoul,Larki, Hossein Department of Mathematics 2020 Kyungpook mathematical journal Vol.60 No.1
We introduce the Leavitt path algebras of ultragraphs and we characterize their ideal structures. We then use this notion to introduce and study the algebraic analogy of Exel-Laca algebras.
Effect of soil overburden pressure on mechanical properties of carbon FRP strips
Vahid Toufigh,Meysam Pourabbas Bilondi,Farshid Tohidi 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.61 No.5
Carbon fiber reinforced polymers (CFRPs) have been recently investigated as an alternative material for Geosynthetics to improve soil properties. One of the factors influencing the fiber orientation and mechanical properties of CFRP is the effect of soil overburden pressure. This study investigates the tensile behavior of cast-in-place CFRP. During the curing time of specimens, a wide range of normal stress is applied on specimens sandwiched between the soils. Two different soil types are used to determine the effect of soil grain size on the mechanical properties of CFRP. Specimens are also prepared with different specifications such as curing time and mixing soil in to the epoxy. In this study, tensile tests are conducted to investigate the effect of such parameters on tensile behavior of CFRP. The experimental results indicate that by increasing the normal stress and soil grain size, the ultimate tensile strength and the corresponding strain of CFRP decrease; however, reduction in elastic modulus is not noticeable. It should be noted that, increasing the curing period of epoxy resin and mixing soil in to the epoxy have no significant effect on the tensile properties of CFRP.
Abbas Doosti,Mohammad Pourabbas,Asghar Arshi,Mohammad Chehelgerdi,Hamidreza Kabiri 질병관리본부 2015 Osong Public Health and Research Persptectives Vol.6 No.1
Objectives: Klebsiella pneumoniae is a gram-negative rod bacterium, a known cause of community-acquired bacterial pneumonia and is an important hospitalacquired pathogen that causes severe morbidity and mortality. The aim of this study was to identify the TEM and SHV genes in K. pneumoniae isolated from cockroaches obtained from hospitals. Methods: In this study, 250 cockroaches were collected from different hospitals in the province of Chaharmahal Va Bakhtiari, which is located in southwest Iran. The samples were examined for the presence of K. pneumoniae by plating onto a combination of culture media, and the antimicrobial susceptibility patterns of isolated K. pneumoniae from samples were evaluated using the disk diffusion test. In addition, from the culture, genomic bacterial DNA was extracted, and sequence-specific targets (TEM and SHV genes) were amplified using the polymerase chain reaction (PCR) method. Results: Out of 250 cockroach samples collected from various hospitals, 179 samples (71.60%) were positive for K. pneumoniae. PCR reaction was performed using specific oligonucleotide primers (TEM-F, TEM-R and SHV-F, SHV-R) for the amplification of each gene, and amplified products were visualized on 1% agarose gel electrophoresis. Of all the specimens amplified by PCR in this research, 32 samples (17.87%) were positive for TEM and 15 samples (8.37%) were positive for SHV. Conclusion: Detection of TEM and SHV genes using molecular methods and their pattern of antimicrobial resistance can provide useful information about the epidemiology of and risk factors associated with K. pneumoniae infection.
Masumeh Faramarzi,Zahra Goharfar,Reza Pourabbas,Atabak Kashefimehr,Adileh Shirmohmmadi 대한구강악안면외과학회 2015 대한구강악안면외과학회지 Vol.41 No.4
Objectives: The purpose of this study was to compare the microbial and clinical effects of mechanical debridement (MD) alone or in combination with the application of enamel matrix derivative (EMD) and sustained-release micro-spherical minocycline (MSM) for treatment of peri-implant mucosal inflammation (PIMI). Materials and Methods: Subjects with at least one implant with PIMI were included and divided into control and two different test groups. In all three groups, MD was performed. In the MSM group, following MD, MSM was placed subgingivally around the implants. In the EMD group, after MD, EMD was placed in the sulcus around the implants. Sampling of peri-implant crevicular fluid for microbial analysis with real-time polymerase chain reaction and recording of probing depth (PD) and bleeding on probing (BOP) were performed prior to as well as two weeks and three months after treatment. Median values and interquartile range were estimated for each variable during the various assessment intervals of the study. Results: In all groups, at two weeks and three months, the counts of Porphyromonas gingivalis decreased significantly compared to baseline. Levels of P. gingivalis were significantly reduced in MSM (P<0.001) and EMD (P=0.026) groups compared to the control group. Also, clinical parameters improved significantly at two weeks and three months. Reduction of PD was significant in MSM (P<0.001) and EMD (P<0.001) groups. The decrease in BOP in the MSM, EMD, and control groups was 60%, 50%, and 20%, respectively. Conclusion: The use of MSM and EMD can be an adjunctive treatment for management of PIMI and improves clinical parameters and reduces P. gingivalis burden three months after treatment.