Journal of lasers in medical sciences, Jan 8, 2017
Introduction: Three-dimensional (3D) scanners are widely used in medicine. One of the application... more Introduction: Three-dimensional (3D) scanners are widely used in medicine. One of the applications of 3D scanners is the acquisition of anthropometric dimensions for ergonomics and the creation of an anthropometry data bank. The aim of this study was to evaluate the precision and accuracy of a modified 3D scanner fabricated in this study. Methods: In this work, a 3D scan of the human body was obtained using DAVID Laser Scanner software and its calibration background, a linear low-power laser, and one advanced webcam. After the 3D scans were imported to the Geomagic software, 10 anthropometric dimensions of 10 subjects were obtained. The measurements of the 3D scanner were compared to the measurements of the same dimensions by a direct anthropometric method. The precision and accuracy of the measurements of the 3D scanner were then evaluated. The obtained data were analyzed using an independent sample t test with the SPSS software. Results: The minimum and maximum measurement differences from three consecutive scans by the 3D scanner were 0.03 mm and 18 mm, respectively. The differences between the measurements by the direct anthropometry method and the 3D scanner were not statistically significant. Therefore, the accuracy of the 3D scanner is acceptable. Conclusion: Future studies will need to focus on the improvement of the scanning speed and the quality of the scanned image.
Abstract A new series of N-(1-benzylpiperidin-4-yl) quinoline-4-carboxamide derivatives was desig... more Abstract A new series of N-(1-benzylpiperidin-4-yl) quinoline-4-carboxamide derivatives was designed and synthesized as potential acetylcholinesterase inhibitors. The compounds were characterized by nuclear magnetic resonance, infrared and mass spectrometry. In the amidation reaction in addition of target compounds 5a-5 h, a bis-N-acylurea were also obtained especially when we added more carbonyldiimidazole (CDI) for the completion of the reaction. Although docking study of these compounds predicted that they will inhibit acetylcholinesterase (AChE) protein strongly and more than the reference drugs, the in vitro evaluation of the quinolines 5a-5 h revealed that most of them had moderate activity toward AChE. The results showed that there is a correlation between anticholinesterase inhibitory potency and docking energy of compounds. Among these compounds, 5f with the lowest docking energy, exhibited the most anticholinesterase inhibitory potency. Molecular dynamics simulation and molecular docking studies of compound 5f into the binding site of acetylcholinesterase exhibited the probable interactions of 5f with the binding site of acetylcholinesterase.
Supplemental material, Supplementary_Table_2 for Similarity of medical concepts in question and a... more Supplemental material, Supplementary_Table_2 for Similarity of medical concepts in question and answering of health communities by Hamid Naderi, Sina Madani, Behzad Kiani and Kobra Etminani in Health Informatics Journal
Supplemental material, Supplementary_Figure_3 for Similarity of medical concepts in question and ... more Supplemental material, Supplementary_Figure_3 for Similarity of medical concepts in question and answering of health communities by Hamid Naderi, Sina Madani, Behzad Kiani and Kobra Etminani in Health Informatics Journal
Supplemental material, Supplementary_Figure_2 for Similarity of medical concepts in question and ... more Supplemental material, Supplementary_Figure_2 for Similarity of medical concepts in question and answering of health communities by Hamid Naderi, Sina Madani, Behzad Kiani and Kobra Etminani in Health Informatics Journal
Supplemental material, Supplementary_Figure_1 for Similarity of medical concepts in question and ... more Supplemental material, Supplementary_Figure_1 for Similarity of medical concepts in question and answering of health communities by Hamid Naderi, Sina Madani, Behzad Kiani and Kobra Etminani in Health Informatics Journal
International Journal of Medical Research and Health Sciences, 2016
This research has been conducted to investigate the relationship between adult attachment dimensi... more This research has been conducted to investigate the relationship between adult attachment dimensions and body image with sexual function. For this purpose, 300 married female BA students at Yazd University were chosen by volunteer sampling. The instruments of this study included the Collins attachment dimensions scale (1996), Marsh’s Physical Self-Description Questionnaire (PSDQ) (1996), and Rosen’s Female Sexual Function Index (2000). Regression analysis results implied that the adult attachment avoidance acts as a negative predictor of sexual function. Furthermore, from among the subscales of body image, appearance acts as positive predictor of arousal, lubrication, orgasm, and satisfaction; perseverance and power act as positive and negative predictors of arousal, respectively. In addition, well-being plays as positive and negative predictor of satisfaction and pain subscales, respectively. It can be deduced that the type of romantic relationship between the couples and the way t...
Two state-of-the-art electrodes were successfully synthesized and used to assemble both symmetric... more Two state-of-the-art electrodes were successfully synthesized and used to assemble both symmetric and asymmetric type supercapacitors. 3DFAB was fabricated by direct pyrolysis of green macroalgae in the presence of NaOH. Possible NaOH activation mechanisms are proposed, which explains the formation of oxygen functional groups through quick penetration of OH- and NaOH into the vacancies. To obtain CoTLM, the tile-like architecture of cobalt oxides was introduced to the 3D interconnected functional algal biochar (3DFAB) by a simple one-pot hydrothermal method under mild conditions. For the symmetric supercapacitors, the maximum specific capacitance of RAB, 3DFAB, and CoTLM were 158, 296, and 445 F g−1 at the current density of 1 A g−1. Regarding cobalt-based asymmetric systems, the maximum capacitance for the 3DFAB//CoTLM was 411 F g−1. This asymmetric supercapacitor device also retained 100.9% of its initial capacitance after 4000 cycles at the current density of 4 A g−1. Unbuffered ...
International Journal of Medical Informatics, 2020
Background: Healthcare consumers are increasingly turning to the online health Q&A communities to... more Background: Healthcare consumers are increasingly turning to the online health Q&A communities to seek answers for their questions because current general search engines are unable to digest complex health-related questions. Q&A communities are platforms where users ask unstructured questions from different healthcare topics. Objectives: This study aimed to provide a concept-based approach to automatically assign health questions to the appropriate domain experts. Methods: We developed three processes for (1) expert profiling, (2) question analysis and (3) similarity calculation and assignment. Semantic weight of concepts combined with TF-IDF weighting comprised vectors of concepts as expert profiles. Subsequently, the similarity between submitted questions and expert profiles was calculated to find a relevant expert. Results: We randomly selected 345 questions posted by consumers for 38 experts in 13 health topics from NetWellness as input data. Our results showed the precision and recall of our proposed method for the studied topics were between 63 %-92 % and 61 %-100 %, respectively. The calculated F-measure in selected topics was between 62 % (Addiction and Substance Abuse) and 94 % (Eye and Vision Care) with a combined F-measure of 80 %. Conclusions: Concept-based methods using unified medical language system and natural language processing techniques could automatically assign actual health questions in different topics to the relevant domain experts with good performance metrics.
International Journal of Medical Engineering and Informatics, 2019
The rapid growth in development and using mobile health applications had significant potential in... more The rapid growth in development and using mobile health applications had significant potential in the field of health. The study objective was to describe apps in the most popular Iranian Android and iOS app stores. Detail information of apps was extracted, categorised by subject and descriptive analyses were done. 3,331 Android and 277 iOS apps were remained for study. 88% of popular Android mHealth apps were free on the other hand, 70% of popular iOS apps were paid. The average price of Android and iOS paid apps were $0.37 and $6.55. The average of rating value for all Android subcategories (total average 4.33) is higher than iOS subcategories (total average 3.58). Our study confirmed fitness was the most popular topic. The average of rating value for all Android subcategories was higher than iOS subcategories. It seems large number of mHealth app users preferred using applications which can update their content continuously.
A high-performance graphene aerogel/cerium oxide nanoparticle composite was prepared by a simple ... more A high-performance graphene aerogel/cerium oxide nanoparticle composite was prepared by a simple hydrothermal technique using para phenylenediamine as a structure-modifying agent. The morphological and structural features of the composite were determined by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman, and Fourier transform infrared spectroscopy. Also, the specific surface area is obtained by the Brunauer-Emmett-Teller (BET) method. The supercapacitive function of all composites is assayed by a variety of electrochemical procedures, essentially cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. Also, continuous cyclic voltammetry is done to estimate the stability of the introduced supercapacitor, and the maximum specific capacitance was obtained for the modified graphene aerogel/cerium oxide nanoparticle nanocomposite. The specific capacitance amounts 365 F g −1 and 376.2 F g −1 were calculated by cyclic voltammetry at ν = 5 mV/s and by charge/discharge curves at the current density of 0.5 A g −1 , respectively. The composite exhibits high cycling stability (only 8.6% reduction of its specific capacitance after recording 4000 cycles in cyclic voltammetry measurements). According to the results, this kind of composite is a promising candidate to improve energy density and supercapacitor performance. (EDLCs), pseudocapacitors, and hybrid capacitors. In a pseudocapacitor, the charge is stored faradaically between the electrode and the electrolyte, but, in the EDLC, it is stored electrostatically. In EDLCs, the electrodes are made of carbon materials, but, in pseudocapacitors, they are prepared with conductive polymers, metal oxides, and available transition metal oxides with different oxidation numbers. The combination of pseudocapacitors and EDLCs creates hybrid capacitors which possess the properties of both systems, leading to higher power and energy densities, better cyclic stability, greater capacity, and higher reliability [7]. The most significant elements which can influence the performance of supercapacitors are electrolyte solutions, binders, and electrode materials. Electrolyte solutions have a vital property in supercapacitor performance. The concentration and the voltage window of an electrolyte can restrict E. Also, electrolyte resistance can limit, the P in a supercapacitor. A proper electrolyte possesses certain features such as large potential window, superb ionic conductivity, suitable electrochemical stability, low resistivity, viscosity, volatility, and small ionic radius. It is also environmentally friendly. Compared with organic electrolytes, aqueous electrolytes, particularly H 2 SO 4 , KOH, and
Sonochemically prepared nanoparticles of terbium tungstate (TWNPs) were evaluated through scannin... more Sonochemically prepared nanoparticles of terbium tungstate (TWNPs) were evaluated through scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR), UV-Vis spectroscopy, and the optimal products were further characterized in terms of their electrochemical properties using conventional and continuous cyclic voltammetry (CV, and CCV), galvanostatic charge/discharge technique, and electrochemical impedance spectroscopy (EIS). The CV studies indicated the TWNPs to have specific capacitance (SC) values of 336 and 205 F g −1 at 1 and 200 mVs −1 , and galvanostatic charge-discharge tests revealed the SC of the TWNP-based electrodes to be 300 F g −1 at 1 Ag −1. Also continuous cyclic voltammetry evaluations proved the sample as having a capacitance retention value of 95.3% after applying 4000 potential cycles. In the light of the results TWNPs were concluded as favorable electrode materials for use in hybrid vehicle systems.
Introduction: Three-dimensional (3D) scanners are widely used in medicine. One of the application... more Introduction: Three-dimensional (3D) scanners are widely used in medicine. One of the applications of 3D scanners is the acquisition of anthropometric dimensions for ergonomics and the creation of an anthropometry data bank. The aim of this study was to evaluate the precision and accuracy of a modified 3D scanner fabricated in this study. Methods: In this work, a 3D scan of the human body was obtained using DAVID Laser Scanner software and its calibration background, a linear low-power laser, and one advanced webcam. After the 3D scans were imported to the Geomagic software, 10 anthropometric dimensions of 10 subjects were obtained. The measurements of the 3D scanner were compared to the measurements of the same dimensions by a direct anthropometric method. The precision and accuracy of the measurements of the 3D scanner were then evaluated. The obtained data were analyzed using an independent sample t test with the SPSS software. Results: The minimum and maximum measurement differences from three consecutive scans by the 3D scanner were 0.03 mm and 18 mm, respectively. The differences between the measurements by the direct anthropometry method and the 3D scanner were not statistically significant. Therefore, the accuracy of the 3D scanner is acceptable. Conclusion: Future studies will need to focus on the improvement of the scanning speed and the quality of the scanned image.
Journal of Materials Science: Materials in Electronics, 2017
electronic, magnetic, and optical properties they present [1-10]. As an instance various rare-ear... more electronic, magnetic, and optical properties they present [1-10]. As an instance various rare-earth metal tungstates and molybdates have been found to enjoy excellent properties like good mechanical strength, high oxide ion conductivity properties and excellent thermal and chemical stabilities. Given this ceramics and nano-crystalline tungstates or molybdates of rare-earths have been found useful in display and solid-state laser devices, optical fibers and scintillators [11-13]. Use of novel nano-materials for the purpose of energy efficiency is an important area which can lead to the reduction of fossil fuel consumption and saving the environment [14-19]. Various nano-materials have been suggested for use in energy storage devices such as electrochemical capacitors (ECs). The application of these compounds has been reported to lead to advantages arising from their versatile surface area, morphology and electrochemical properties, which gravely affect the surface and/or interfacial interaction/extraction reactions, which are translated into the improved activity and stability of the devices [20-22]. Electrochemical capacitors (ECs), can be defined as charge-storage devices with very rapid charge and discharge phenomena, offering a unique set of high power and energy, as well as long lifetime. These supercapacitors have recently been treated as energy storage devices with high power densities, long-term cycling stabilities and fast charge/discharge. The outstanding properties of supercapacitors, have changed these devices to promising candidates as energy storage devices in a range of applications like cordless and portable electric equipment's, hybrid and/ or electric vehicles, and portable power sources [23-25]. The application of sonochemical reactions for the preparation of materials with novel and unusual properties has proven to be very useful since the 1980s. Ultrasonic irradiations from 20 to 1 MHz have been used as a common Abstract The work focuses on the synthesis of Sm 2 (WO 4) 3 nanoparticles through a reagent-free aqueous-phase sonochemical reaction between samarium nitrate hexahydrate and Na 2 WO 4 .2H 2 O solutions. The prepared Sm 2 (WO 4) 3 nano-structures were also characterized by XRD, EDS and SEM to evaluate their structures and morphology. The magnetic properties of as-prepared Sm 2 (WO 4) 3 nanoparticles were also investigated with vibrating sample magnetometer (VSM). Cyclic voltammetry (CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS) have been used to investigate the supercapacitive property of the samarium(III) tungstate electrode. The samarium(III) tungstate electrode shows high specific capacitance of 326 F g −1 at scan rate of 2 mV s −1 in 2.0 M H 2 SO 4 electrolyte. Thus, the prepared electrode could be potential electrode materials for supercapacitors.
The presented case features a rare manifestation of pulmonary tuberculosis in a previously health... more The presented case features a rare manifestation of pulmonary tuberculosis in a previously healthy young woman who had acute presentation of tuberculous pneumonia complicated by acute respiratory distress syndrome. In developing countries, mycobacterium tuberculosis is an important cause of community-acquired pneumonia (CAP). TB can present as an acute process and should be included in the differential diagnosis of CAP. This case is special in its manifestation from several clinical perspectives, including the lack of an underlying medical condition or immune defect and the development of acute respiratory distress syndrome (ARDS) in non-miliary and non-disseminated tuberculosis. In conclusion, the diagnosis of TB should be considered in all patients who present with CAP in endemic regions.
Interdisciplinary Perspectives on Infectious Diseases, 2016
The elderly comprise less than 13 percent of world population. Nonetheless, they represent nearly... more The elderly comprise less than 13 percent of world population. Nonetheless, they represent nearly half of all hospitalized adults. Acute change in mental status from baseline is commonly seen among the elderly even when the main process does not involve the central nervous system. The term “geriatric syndrome” is used to capture those clinical conditions in older people that do not fit into discrete disease categories, including delirium, falls, frailty, dizziness, syncope, and urinary incontinence. Despite the growing number of elderly population, especially those who require hospitalization and the high burden of common infections accompanied by encephalopathy among them, there are several unresolved questions regarding the optimal management they deserve. The questions posed in this systematic review concern the need to rule out CNS infection in all elderly patients presented with fever and altered mental status in the routine management of febrile encephalopathy. In doing so, we...
Idiopathic granulomatous mastitis (IGM) is a chronic benign inflammatory disease of the breast wi... more Idiopathic granulomatous mastitis (IGM) is a chronic benign inflammatory disease of the breast with unknown etiology. It is an important diagnostic and therapeutic challenge, as most patients were initially misdiagnosed by their primary care physicians, leading to diagnostic confusion and heightened anxiety. Although several triggers have been proposed for development of IGM, the etiologic association of neither of them has been documented. Three main hypotheses about the possible causes of IGM have been suggested, including autoimmune response, infectious disease, and hormonal disruption. Here, we discuss a hypothetical perspective of IGM to explain the possible role of autoinflammation in the pathogenesis of the disease. We also reviewed the previously published literature on pathogenesis of IGM.
Journal of lasers in medical sciences, Jan 8, 2017
Introduction: Three-dimensional (3D) scanners are widely used in medicine. One of the application... more Introduction: Three-dimensional (3D) scanners are widely used in medicine. One of the applications of 3D scanners is the acquisition of anthropometric dimensions for ergonomics and the creation of an anthropometry data bank. The aim of this study was to evaluate the precision and accuracy of a modified 3D scanner fabricated in this study. Methods: In this work, a 3D scan of the human body was obtained using DAVID Laser Scanner software and its calibration background, a linear low-power laser, and one advanced webcam. After the 3D scans were imported to the Geomagic software, 10 anthropometric dimensions of 10 subjects were obtained. The measurements of the 3D scanner were compared to the measurements of the same dimensions by a direct anthropometric method. The precision and accuracy of the measurements of the 3D scanner were then evaluated. The obtained data were analyzed using an independent sample t test with the SPSS software. Results: The minimum and maximum measurement differences from three consecutive scans by the 3D scanner were 0.03 mm and 18 mm, respectively. The differences between the measurements by the direct anthropometry method and the 3D scanner were not statistically significant. Therefore, the accuracy of the 3D scanner is acceptable. Conclusion: Future studies will need to focus on the improvement of the scanning speed and the quality of the scanned image.
Abstract A new series of N-(1-benzylpiperidin-4-yl) quinoline-4-carboxamide derivatives was desig... more Abstract A new series of N-(1-benzylpiperidin-4-yl) quinoline-4-carboxamide derivatives was designed and synthesized as potential acetylcholinesterase inhibitors. The compounds were characterized by nuclear magnetic resonance, infrared and mass spectrometry. In the amidation reaction in addition of target compounds 5a-5 h, a bis-N-acylurea were also obtained especially when we added more carbonyldiimidazole (CDI) for the completion of the reaction. Although docking study of these compounds predicted that they will inhibit acetylcholinesterase (AChE) protein strongly and more than the reference drugs, the in vitro evaluation of the quinolines 5a-5 h revealed that most of them had moderate activity toward AChE. The results showed that there is a correlation between anticholinesterase inhibitory potency and docking energy of compounds. Among these compounds, 5f with the lowest docking energy, exhibited the most anticholinesterase inhibitory potency. Molecular dynamics simulation and molecular docking studies of compound 5f into the binding site of acetylcholinesterase exhibited the probable interactions of 5f with the binding site of acetylcholinesterase.
Supplemental material, Supplementary_Table_2 for Similarity of medical concepts in question and a... more Supplemental material, Supplementary_Table_2 for Similarity of medical concepts in question and answering of health communities by Hamid Naderi, Sina Madani, Behzad Kiani and Kobra Etminani in Health Informatics Journal
Supplemental material, Supplementary_Figure_3 for Similarity of medical concepts in question and ... more Supplemental material, Supplementary_Figure_3 for Similarity of medical concepts in question and answering of health communities by Hamid Naderi, Sina Madani, Behzad Kiani and Kobra Etminani in Health Informatics Journal
Supplemental material, Supplementary_Figure_2 for Similarity of medical concepts in question and ... more Supplemental material, Supplementary_Figure_2 for Similarity of medical concepts in question and answering of health communities by Hamid Naderi, Sina Madani, Behzad Kiani and Kobra Etminani in Health Informatics Journal
Supplemental material, Supplementary_Figure_1 for Similarity of medical concepts in question and ... more Supplemental material, Supplementary_Figure_1 for Similarity of medical concepts in question and answering of health communities by Hamid Naderi, Sina Madani, Behzad Kiani and Kobra Etminani in Health Informatics Journal
International Journal of Medical Research and Health Sciences, 2016
This research has been conducted to investigate the relationship between adult attachment dimensi... more This research has been conducted to investigate the relationship between adult attachment dimensions and body image with sexual function. For this purpose, 300 married female BA students at Yazd University were chosen by volunteer sampling. The instruments of this study included the Collins attachment dimensions scale (1996), Marsh’s Physical Self-Description Questionnaire (PSDQ) (1996), and Rosen’s Female Sexual Function Index (2000). Regression analysis results implied that the adult attachment avoidance acts as a negative predictor of sexual function. Furthermore, from among the subscales of body image, appearance acts as positive predictor of arousal, lubrication, orgasm, and satisfaction; perseverance and power act as positive and negative predictors of arousal, respectively. In addition, well-being plays as positive and negative predictor of satisfaction and pain subscales, respectively. It can be deduced that the type of romantic relationship between the couples and the way t...
Two state-of-the-art electrodes were successfully synthesized and used to assemble both symmetric... more Two state-of-the-art electrodes were successfully synthesized and used to assemble both symmetric and asymmetric type supercapacitors. 3DFAB was fabricated by direct pyrolysis of green macroalgae in the presence of NaOH. Possible NaOH activation mechanisms are proposed, which explains the formation of oxygen functional groups through quick penetration of OH- and NaOH into the vacancies. To obtain CoTLM, the tile-like architecture of cobalt oxides was introduced to the 3D interconnected functional algal biochar (3DFAB) by a simple one-pot hydrothermal method under mild conditions. For the symmetric supercapacitors, the maximum specific capacitance of RAB, 3DFAB, and CoTLM were 158, 296, and 445 F g−1 at the current density of 1 A g−1. Regarding cobalt-based asymmetric systems, the maximum capacitance for the 3DFAB//CoTLM was 411 F g−1. This asymmetric supercapacitor device also retained 100.9% of its initial capacitance after 4000 cycles at the current density of 4 A g−1. Unbuffered ...
International Journal of Medical Informatics, 2020
Background: Healthcare consumers are increasingly turning to the online health Q&A communities to... more Background: Healthcare consumers are increasingly turning to the online health Q&A communities to seek answers for their questions because current general search engines are unable to digest complex health-related questions. Q&A communities are platforms where users ask unstructured questions from different healthcare topics. Objectives: This study aimed to provide a concept-based approach to automatically assign health questions to the appropriate domain experts. Methods: We developed three processes for (1) expert profiling, (2) question analysis and (3) similarity calculation and assignment. Semantic weight of concepts combined with TF-IDF weighting comprised vectors of concepts as expert profiles. Subsequently, the similarity between submitted questions and expert profiles was calculated to find a relevant expert. Results: We randomly selected 345 questions posted by consumers for 38 experts in 13 health topics from NetWellness as input data. Our results showed the precision and recall of our proposed method for the studied topics were between 63 %-92 % and 61 %-100 %, respectively. The calculated F-measure in selected topics was between 62 % (Addiction and Substance Abuse) and 94 % (Eye and Vision Care) with a combined F-measure of 80 %. Conclusions: Concept-based methods using unified medical language system and natural language processing techniques could automatically assign actual health questions in different topics to the relevant domain experts with good performance metrics.
International Journal of Medical Engineering and Informatics, 2019
The rapid growth in development and using mobile health applications had significant potential in... more The rapid growth in development and using mobile health applications had significant potential in the field of health. The study objective was to describe apps in the most popular Iranian Android and iOS app stores. Detail information of apps was extracted, categorised by subject and descriptive analyses were done. 3,331 Android and 277 iOS apps were remained for study. 88% of popular Android mHealth apps were free on the other hand, 70% of popular iOS apps were paid. The average price of Android and iOS paid apps were $0.37 and $6.55. The average of rating value for all Android subcategories (total average 4.33) is higher than iOS subcategories (total average 3.58). Our study confirmed fitness was the most popular topic. The average of rating value for all Android subcategories was higher than iOS subcategories. It seems large number of mHealth app users preferred using applications which can update their content continuously.
A high-performance graphene aerogel/cerium oxide nanoparticle composite was prepared by a simple ... more A high-performance graphene aerogel/cerium oxide nanoparticle composite was prepared by a simple hydrothermal technique using para phenylenediamine as a structure-modifying agent. The morphological and structural features of the composite were determined by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman, and Fourier transform infrared spectroscopy. Also, the specific surface area is obtained by the Brunauer-Emmett-Teller (BET) method. The supercapacitive function of all composites is assayed by a variety of electrochemical procedures, essentially cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. Also, continuous cyclic voltammetry is done to estimate the stability of the introduced supercapacitor, and the maximum specific capacitance was obtained for the modified graphene aerogel/cerium oxide nanoparticle nanocomposite. The specific capacitance amounts 365 F g −1 and 376.2 F g −1 were calculated by cyclic voltammetry at ν = 5 mV/s and by charge/discharge curves at the current density of 0.5 A g −1 , respectively. The composite exhibits high cycling stability (only 8.6% reduction of its specific capacitance after recording 4000 cycles in cyclic voltammetry measurements). According to the results, this kind of composite is a promising candidate to improve energy density and supercapacitor performance. (EDLCs), pseudocapacitors, and hybrid capacitors. In a pseudocapacitor, the charge is stored faradaically between the electrode and the electrolyte, but, in the EDLC, it is stored electrostatically. In EDLCs, the electrodes are made of carbon materials, but, in pseudocapacitors, they are prepared with conductive polymers, metal oxides, and available transition metal oxides with different oxidation numbers. The combination of pseudocapacitors and EDLCs creates hybrid capacitors which possess the properties of both systems, leading to higher power and energy densities, better cyclic stability, greater capacity, and higher reliability [7]. The most significant elements which can influence the performance of supercapacitors are electrolyte solutions, binders, and electrode materials. Electrolyte solutions have a vital property in supercapacitor performance. The concentration and the voltage window of an electrolyte can restrict E. Also, electrolyte resistance can limit, the P in a supercapacitor. A proper electrolyte possesses certain features such as large potential window, superb ionic conductivity, suitable electrochemical stability, low resistivity, viscosity, volatility, and small ionic radius. It is also environmentally friendly. Compared with organic electrolytes, aqueous electrolytes, particularly H 2 SO 4 , KOH, and
Sonochemically prepared nanoparticles of terbium tungstate (TWNPs) were evaluated through scannin... more Sonochemically prepared nanoparticles of terbium tungstate (TWNPs) were evaluated through scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR), UV-Vis spectroscopy, and the optimal products were further characterized in terms of their electrochemical properties using conventional and continuous cyclic voltammetry (CV, and CCV), galvanostatic charge/discharge technique, and electrochemical impedance spectroscopy (EIS). The CV studies indicated the TWNPs to have specific capacitance (SC) values of 336 and 205 F g −1 at 1 and 200 mVs −1 , and galvanostatic charge-discharge tests revealed the SC of the TWNP-based electrodes to be 300 F g −1 at 1 Ag −1. Also continuous cyclic voltammetry evaluations proved the sample as having a capacitance retention value of 95.3% after applying 4000 potential cycles. In the light of the results TWNPs were concluded as favorable electrode materials for use in hybrid vehicle systems.
Introduction: Three-dimensional (3D) scanners are widely used in medicine. One of the application... more Introduction: Three-dimensional (3D) scanners are widely used in medicine. One of the applications of 3D scanners is the acquisition of anthropometric dimensions for ergonomics and the creation of an anthropometry data bank. The aim of this study was to evaluate the precision and accuracy of a modified 3D scanner fabricated in this study. Methods: In this work, a 3D scan of the human body was obtained using DAVID Laser Scanner software and its calibration background, a linear low-power laser, and one advanced webcam. After the 3D scans were imported to the Geomagic software, 10 anthropometric dimensions of 10 subjects were obtained. The measurements of the 3D scanner were compared to the measurements of the same dimensions by a direct anthropometric method. The precision and accuracy of the measurements of the 3D scanner were then evaluated. The obtained data were analyzed using an independent sample t test with the SPSS software. Results: The minimum and maximum measurement differences from three consecutive scans by the 3D scanner were 0.03 mm and 18 mm, respectively. The differences between the measurements by the direct anthropometry method and the 3D scanner were not statistically significant. Therefore, the accuracy of the 3D scanner is acceptable. Conclusion: Future studies will need to focus on the improvement of the scanning speed and the quality of the scanned image.
Journal of Materials Science: Materials in Electronics, 2017
electronic, magnetic, and optical properties they present [1-10]. As an instance various rare-ear... more electronic, magnetic, and optical properties they present [1-10]. As an instance various rare-earth metal tungstates and molybdates have been found to enjoy excellent properties like good mechanical strength, high oxide ion conductivity properties and excellent thermal and chemical stabilities. Given this ceramics and nano-crystalline tungstates or molybdates of rare-earths have been found useful in display and solid-state laser devices, optical fibers and scintillators [11-13]. Use of novel nano-materials for the purpose of energy efficiency is an important area which can lead to the reduction of fossil fuel consumption and saving the environment [14-19]. Various nano-materials have been suggested for use in energy storage devices such as electrochemical capacitors (ECs). The application of these compounds has been reported to lead to advantages arising from their versatile surface area, morphology and electrochemical properties, which gravely affect the surface and/or interfacial interaction/extraction reactions, which are translated into the improved activity and stability of the devices [20-22]. Electrochemical capacitors (ECs), can be defined as charge-storage devices with very rapid charge and discharge phenomena, offering a unique set of high power and energy, as well as long lifetime. These supercapacitors have recently been treated as energy storage devices with high power densities, long-term cycling stabilities and fast charge/discharge. The outstanding properties of supercapacitors, have changed these devices to promising candidates as energy storage devices in a range of applications like cordless and portable electric equipment's, hybrid and/ or electric vehicles, and portable power sources [23-25]. The application of sonochemical reactions for the preparation of materials with novel and unusual properties has proven to be very useful since the 1980s. Ultrasonic irradiations from 20 to 1 MHz have been used as a common Abstract The work focuses on the synthesis of Sm 2 (WO 4) 3 nanoparticles through a reagent-free aqueous-phase sonochemical reaction between samarium nitrate hexahydrate and Na 2 WO 4 .2H 2 O solutions. The prepared Sm 2 (WO 4) 3 nano-structures were also characterized by XRD, EDS and SEM to evaluate their structures and morphology. The magnetic properties of as-prepared Sm 2 (WO 4) 3 nanoparticles were also investigated with vibrating sample magnetometer (VSM). Cyclic voltammetry (CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS) have been used to investigate the supercapacitive property of the samarium(III) tungstate electrode. The samarium(III) tungstate electrode shows high specific capacitance of 326 F g −1 at scan rate of 2 mV s −1 in 2.0 M H 2 SO 4 electrolyte. Thus, the prepared electrode could be potential electrode materials for supercapacitors.
The presented case features a rare manifestation of pulmonary tuberculosis in a previously health... more The presented case features a rare manifestation of pulmonary tuberculosis in a previously healthy young woman who had acute presentation of tuberculous pneumonia complicated by acute respiratory distress syndrome. In developing countries, mycobacterium tuberculosis is an important cause of community-acquired pneumonia (CAP). TB can present as an acute process and should be included in the differential diagnosis of CAP. This case is special in its manifestation from several clinical perspectives, including the lack of an underlying medical condition or immune defect and the development of acute respiratory distress syndrome (ARDS) in non-miliary and non-disseminated tuberculosis. In conclusion, the diagnosis of TB should be considered in all patients who present with CAP in endemic regions.
Interdisciplinary Perspectives on Infectious Diseases, 2016
The elderly comprise less than 13 percent of world population. Nonetheless, they represent nearly... more The elderly comprise less than 13 percent of world population. Nonetheless, they represent nearly half of all hospitalized adults. Acute change in mental status from baseline is commonly seen among the elderly even when the main process does not involve the central nervous system. The term “geriatric syndrome” is used to capture those clinical conditions in older people that do not fit into discrete disease categories, including delirium, falls, frailty, dizziness, syncope, and urinary incontinence. Despite the growing number of elderly population, especially those who require hospitalization and the high burden of common infections accompanied by encephalopathy among them, there are several unresolved questions regarding the optimal management they deserve. The questions posed in this systematic review concern the need to rule out CNS infection in all elderly patients presented with fever and altered mental status in the routine management of febrile encephalopathy. In doing so, we...
Idiopathic granulomatous mastitis (IGM) is a chronic benign inflammatory disease of the breast wi... more Idiopathic granulomatous mastitis (IGM) is a chronic benign inflammatory disease of the breast with unknown etiology. It is an important diagnostic and therapeutic challenge, as most patients were initially misdiagnosed by their primary care physicians, leading to diagnostic confusion and heightened anxiety. Although several triggers have been proposed for development of IGM, the etiologic association of neither of them has been documented. Three main hypotheses about the possible causes of IGM have been suggested, including autoimmune response, infectious disease, and hormonal disruption. Here, we discuss a hypothetical perspective of IGM to explain the possible role of autoinflammation in the pathogenesis of the disease. We also reviewed the previously published literature on pathogenesis of IGM.
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Papers by Hamid Naderi