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Abbas Shokri,Mohammad Javad Faradmal,Bahareh Hekmat 대한영상치의학회 2019 Imaging Science in Dentistry Vol.49 No.2
Purpose: Anatomical variations of the external nasal wall are highly important, since they play a role in obstruction or drainage of the ostiomeatal complex and ventilation and can consequently elevate the risk of pathological sinus conditions. This study aimed to assess anatomical variations of the nasal cavity and ethmoidal sinuses and their correlations on cone-beam computed tomography (CBCT) scans. Materials and Methods: This cross-sectional study evaluated CBCT scans of 250 patients, including 107 males and 143 females, to determine the prevalence of anatomical variations of the nasal cavity and ethmoidal sinuses. All images were taken using a New Tom 3G scanner. Data were analyzed using the chi-square test, Kruskal-Wallis test, and the Mann-Whitney test. Results: The most common anatomical variations were found to be nasal septal deviation (90.4%), agger nasi air cell (53.6%), superior orbital cell (47.6%), pneumatized nasal septum (40%), and Onodi air cell (37.2%). Correlations were found between nasal septal deviation and the presence of a pneumatized nasal septum, nasal spur, and Haller cell. No significant associations were noted between the age or sex of patients and the presence of anatomical variations (P>0.05). Conclusion: Radiologists and surgeons must pay close attention to the anatomical variations of the sinonasal region in the preoperative assessment to prevent perioperative complications.
Nonlinear control of structure using neuro-predictive algorithm
Abbas Karamodin,Amir Baghban,Hasan Haji-Kazemi 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.16 No.6
A new neural network (NN) predictive controller (NNPC) algorithm has been developed and tested in the computer simulation of active control of a nonlinear structure. In the present method an NN is used as a predictor. This NN has been trained to predict the future response of the structure to determine the control forces. These control forces are calculated by minimizing the difference between the predicted and desired responses via a numerical minimization algorithm. Since the NNPC is very time consuming and not suitable for real-time control, it is then used to train an NN controller. To consider the effectiveness of the controller on probability of damage, fragility curves are generated. The approach is validated by using simulated response of a 3 story nonlinear benchmark building excited by several historical earthquake records. The simulation results are then compared with a linear quadratic Gaussian (LQG) active controller. The results indicate that the proposed algorithm is completely effective in relative displacement reduction.
Extraction of high thermally stable and nanofibrous chitin from Cicada (Cicadoidea)
Abbas Mol,Murat Kaya,Muhammad Mujtaba,Bahar AKYUZ 한국곤충학회 2018 Entomological Research Vol.48 No.6
Due to the increasing interest in natural biopolymers including chitin, the exploitation of economic and easily accessible chitin sources with good physicochemical properties is nowadays required. In view of this fact, in the current study chitin was extracted and physicochemically characterized from six Cicadas (Hemiptera: Homoptera: Cicadoidea) species collected from Mediterranean region of Turkey (2014–15). Chitin was extracted using a classic extraction method that includes acid and base treatment. TGA results revealed a remarkable increase (410–412°C) for all the six Cicada species compared to other chitin samples extracted from various sources. For all of the six selected species the chitin contents on the dry basis were determined as 6.7% for Cicadatra atra, 5.51% for C. hyalina, 8.84% for C. platyptera, 4.97% for Cicada lodosi, 6.49% for C. mordoganensis, and 5.88% for Cicadetta tibialis. The surface morphology of chitin isolates from Cicada species was observed to consist of nanofibers and nanopores.
FIXED POINTS OF ASYMPTOTICALLY NONEXPANSIVE MAPPINGS IN THE INTERMEDIATE SENSE IN CAT(0) SPACES
Abbas, Mujahid,Thakur, Balwant Singh,Thakur, Dipti Korean Mathematical Society 2013 대한수학회논문집 Vol.28 No.1
The purpose of this paper is to investigate the demiclosed principle, the existence theorems and convergence theorems in CAT(0) spaces for a class of mappings which is essentially wider than that of asymptotically nonexpansive mappings. The structure of fixed point set of such mappings is also studied. Our results generalize, unify and extend several comparable results in the existing literature.
Modified SVM to Meet CMV and DC Current Ripple Reduction
Abbas Dehghani,Khalil El Khamlichi Drissi,Christophe Pasquier 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper introduces the Modified conventional SVM (MSVM) in order to improve CMV, switching losses, and THD feature of two-level Voltage Source Inverter (VSI). The proposed method divides nulltime, resulted from SVM, to these of two nearby active vectors, forming sector, to calculate new duty cycles. This modification also can be envisaged as transferring matrix, in which its elements are function of percentage of allocating null-time to active ones. Avoiding null-vectors not only result in reduction of CMV peak value but also lead to mitigating THD. Moreover, MSVM mitigates the number of commutations which are proportional to switching losses. In this work, theoretical approach to calculate switching losses, respecting load power factor is formulized. Mathematical approaches, simulation results, carried out through MATLAB/Simulink environment, and finally experimental results verify its validity in above-mentioned achievement. Proposed strategy is simply applied without adding any extra hardware and complex calculations.
Abbas, Mohsin Occupational Safety and Health Research Institute 2015 Safety and health at work Vol.6 No.3
Background: The present study aimed to analyze the index value trends of injured employed persons (IEPs) covered in Pakistan Labour Force Surveys from 2001-02 to 2012-13. Methods: The index value method based on reference years and reference groups was used to analyze the IEP trends in terms of different criteria such as gender, area, employment status, industry types, occupational groups, types of injury, injured body parts, and treatment received. The Pearson correlation coefficient analysis was also performed to investigate the inter-relationship of different occupational variables. Results: The values of IEP increased at the end of the studied year in industry divisions such as agriculture, forestry, hunting, and fishing, followed by in manufacturing and construction industry divisions. People associated with major occupations (such as skilled agricultural and fishery workers) and elementary (unskilled) occupations were found to be at an increasing risk of occupational injuries/diseases with an increasing IEP trend. Types of occupational injuries such as sprain or strain, superficial injury, and dislocation increased during the studied years. Major injured parts of body such as upper limb and lower limb found with increasing trend. Types of treatment received, including hospitalization and no treatment, were found to decrease. Increased IEP can be justified due to inadequate health care facilities, especially in rural areas by increased IEP in terms of gender, areas, received treatment, occupational groups and employment status as results found after Pearson correlation coefficient analysis. Conclusion: The increasing trend in the IEP% of the total employed persons due to agrarian activities shows that there is a need to improve health care setups in rural areas of Pakistan.
All metal oxide-based transparent and flexible photodetector
Abbas, Sohail,Kumar, Mohit,Kim, Joondong Elsevier 2018 Materials science in semiconductor processing Vol.88 No.-
<P><B>Abstract</B></P> <P>We demonstrate the fabrication and characterization of flexible and transparent photodetector based on conformally grown Ag<SUB>x</SUB>O/TiO<SUB>2</SUB>/ITO layers on polyethylene terephthalate substrate. Initially, the thickness of Ag<SUB>x</SUB>O and ITO layers were optimized via deposition time to match layers crystallinity with fixed intermediate TiO<SUB>2</SUB> layer, for better optical and electrical properties. The highly transparent (> 70%) and flexible device presents the high-preforming responses over the broadband light. Under UV illumination, it showed a high responsivity (323 mA/W) and detectivity (4.2 × 10<SUP>8</SUP> Jones). Similarly, a noise equivalent power of 2.3 × 10<SUP>−9</SUP> W/Hz<SUP>1/2</SUP> is obtained, which confirmed its capability to detect light at nanowatt level. Moreover, mechanical flexibility test was performed for the flexible and transparent Ag<SUB>x</SUB>O/TiO<SUB>2</SUB>/ITO device. It was found that the device is robust to have good optoelectronic performances even after 500 no. of bending cycles. Thus, the utilization of earth abundant metal-oxides can facilitate the flexibility, durability and transparency of next generation optoelectronic devices.</P>