Synthesis of alumina nano powder by a gel combustion method

Mehdi Taleghani 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.1

In this study a gel combustion method was used to prepare alumina nano powder. Aluminum nitrate, citric acid and glycine and urea fuels were used. An analysis of the effect of the type of fuels and their synthesis was done and followed by calcination at temperatures of 400-700-1000 ο C. The results showed that using urea as the fuel to raw material ratio of 1 to 1 and in the fuels synthesis, citric acid to urea (50% + 50%) ratio of 1 to 1 and a calcination temperature of 700 ο C, the powerful optimum conditions for the synthesis of aluminum oxide nano powder Al2O3 at dimensions of 20 nm was obtained.

Prevalence and location of the posterior superior alveolar artery using cone-beam computed tomography

Tehranchi, Maryam,Taleghani, Ferial,Shahab, Shahriar,Nouri, Arash Korean Academy of Oral and Maxillofacial Radiology 2017 Imaging Science in Dentistry Vol.47 No.1

Purpose: Insufficient knowledge of the anatomy of the maxillary sinuses prior to sinus graft surgery may lead to perioperative or postoperative complications. This study sought to characterize the position of the posterior superior alveolar artery (PSAA) within the maxillary sinuses using cone-beam computed tomography (CBCT). Materials and Methods: A total of 300 patients with edentulous posterior maxillae, including 138 females and 162 males with an age range of 33-86 years, who presented to a radiology clinic between 2013 and 2015 were enrolled in this retrospective cross-sectional study. The distance from the inferior border of the PSAA to the alveolar crest according to the residual ridge classification by Lekholm and Zarb, the distance from the PSAA to the nasal septum and zygomatic arch, and the diameter and position of the PSAA were all assessed on patients' CBCT scans. The data were analyzed using the Mann-Whitney test and the t-test. Results: The PSAA was detected on the CBCT scans of 87% of the patients; it was located beneath the sinus membrane in 47% of cases and was intraosseous in 47% of cases. The diameter of the artery was between 1 and 2 mm in most patients (72%). The mean diameter of the artery was $1.29{\pm}0.39mm$, and the mean distances from the PSAA to the zygomatic arch, nasal septum, and alveolar crest were $22.59{\pm}4.89mm$, $26.51{\pm}3.52mm$, and $16.7{\pm}3.96mm$, respectively. Conclusion: The likelihood of detecting the PSAA on CBCT scans is high; its location is intraosseous or beneath the sinus membrane in most patients. Determining the exact location of the PSAA on CBCT scans preoperatively can help prevent it from being damaged during surgery.

Prevalence and location of the posterior superior alveolar artery using cone-beam computed tomography

Maryam Tehranchi,Ferial Taleghani,Shahriar Shahab,Arash Nouri 대한영상치의학회 2017 Imaging Science in Dentistry Vol.47 No.1

Purpose: Insufficient knowledge of the anatomy of the maxillary sinuses prior to sinus graft surgery may lead to perioperative or postoperative complications. This study sought to characterize the position of the posterior superior alveolar artery (PSAA) within the maxillary sinuses using cone-beam computed tomography (CBCT). Materials and Methods: A total of 300 patients with edentulous posterior maxillae, including 138 females and 162 males with an age range of 33-86 years, who presented to a radiology clinic between 2013 and 2015 were enrolled in this retrospective cross-sectional study. The distance from the inferior border of the PSAA to the alveolar crest according to the residual ridge classification by Lekholm and Zarb, the distance from the PSAA to the nasal septum and zygomatic arch, and the diameter and position of the PSAA were all assessed on patients’ CBCT scans. The data were analyzed using the Mann-Whitney test and the t-test. Results: The PSAA was detected on the CBCT scans of 87% of the patients; it was located beneath the sinus membrane in 47% of cases and was intraosseous in 47% of cases. The diameter of the artery was between 1 and 2 mm in most patients (72%). The mean diameter of the artery was 1.29±0.39 mm, and the mean distances from the PSAA to the zygomatic arch, nasal septum, and alveolar crest were 22.59±4.89 mm, 26.51±3.52 mm, and 16.7±3.96 mm, respectively. Conclusion: The likelihood of detecting the PSAA on CBCT scans is high; its location is intraosseous or beneath the sinus membrane in most patients. Determining the exact location of the PSAA on CBCT scans preoperatively can help prevent it from being damaged during surgery.

Mast Cell Concentrations in Peripheral and Central Giant Cell Granulomas: Is there any Angiogenetic Role?

Farhadi, Sareh,Shahsavari, Fatemeh,Taleghani, Ferial,Komasi, Elaheh Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.2

Background: In the maxillofacial region, giant cell granulomas occur in 2 clinical forms, central and peripheral. Despite histopathological similarity between these 2 forms totally different clinical behaviors have been reported. The present study was undertaken to compare mast cell and vascular concentrations in these pathologic lesions. Materials and Methods: In this cross-sectional descriptive study, 20 pathological samples of central giant cell granuloma (CGCG) and 20 samples of peripheral giant cell granuloma (PGCG) were selected and examined through toluidine blue staining for mast cell assessment and immunohistochemical staining by VEGEF antibody for comparing the number of mast cells. T-test, chi-squared test and backward multivariate linear regression were used for statistical analysis using SPSS 20. Statistical significance was set at P<0.05. Results: This study showed significantly greater VEGF expression and mast cell concentrations in CGCG compared to PGCG cases. Also there was a significant correlation between VEGF expression and the concentration of mast cells. No relation was found between age, sex and site of the lesion and concentration of mast cells or VEGF expression. Conclusions: It is feasible that higher concentrations of mast cells in CGCG versus PGCG samples might lead to more aggressive clinical behavior via vascular proliferation and angiogenesis. However, other biologic mechanisms should be considered in this situation.

ICE Matching, a Novel Approach for Localization Problem

Maziar A.Sharbafi,Sanaz Taleghani,Edriss Esmaeili,Abolfazl T.Haghighat,Omid Aghazadeh 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10

This paper presents a novel technique for scan matching. The method is based on the family of feature to feature matching approaches. Our innovative method named ICE matching leads to a fast and accurate solution to solve the challenges of localization problem. Novelty in defining new features, matching mechanism and new state estimation approach, congregated in this method, creates a robust practical technique in terms of accuracy and convergence rate. Furthermore, The Comparison with some high quality scan matching methods from different viewpoints illustrates the performance of ICE matching.

Performance of CNT-CNP aerogel as electrode in capacitive deionization system

Tabrizi N. Salman,Taleghani M. Salehi 한국탄소학회 2023 Carbon Letters Vol.33 No.4

In this study, hybrid aerogels containing carbon nanoparticles (CNP) and multi-walled carbon nanotubes (MWCNT) were synthesized via sol–gel method using resorcinol/formaldehyde precursors through a hydrolysis-condensation reaction mechanism. Porous carbonaceous structures were achieved by freeze-drying of the organic gels followed by controlled carbonization under an inert gas. The samples were characterized by various techniques such as FTIR, BJH, FESEM, CV, and EIS. The specific surface area and total pore volume of the aerogel sample were measured to be as high as 452 m2/g and 0.782 cm3/g, respectively, thus enhancing the electric double-layer formation. Electrochemical tests on the samples showed a large specific capacitance (212 F/g) and an excellent cyclic stability over 3000 cycles. Performance of the synthesized structures was subsequently assessed as electrodes in a capacitive deionization (CDI) process. At the operating conditions of 1.6 V voltage, flow rate of 20 mL/min, and NaCl concentration of 1000 mg/L a promising adsorption capacity around 42.08 mg/g was achieved.

Facile and simple synthesis of triethylenetetramine-modified mesoporous silica adsorbent for removal of Cd(II)

Atena Abedi,Hamidreza Ghafouri Taleghani,Mohsen Ghorbani,Hamed Salimi Kenari 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.1

Monodispersed porous silica microspheres (SM) were synthesized and further functionalized with amine moieties using triethylenetetramine (TETA) in order to obtain a novel adsorbent for Cd(II) elimination from aqueous media. The morphology, texture and structure of samples were characterized with the aid of Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD), scanning and transmission electron microscopy (SEM, TEM), energy dispersive spectroscopy (EDS), and N2 adsorption-desorption. The adsorption efficiency was investigated based on the effect of operational parameters including pH of the solution, the dose of adsorbent, adsorption time, initial concentration of Cd(II) ions and temperature. The equilibrium, kinetics and thermodynamics of Cd(II) adsorption were also studied. The maximum adsorption capacity of amine functionalized silica microspheres (AMSM) for Cd(II) was 35.6mg g1. Cd(II) adsorption onto AMSM had highest consistency with Sips and Langmuir isotherms, while adsorption kinetics was best fitted with pseudo-second order model. Thermodynamics of adsorption revealed that Cd(II) adsorption on AMSM was spontaneous, feasible and exothermic with physical interactions and pore diffusion being the dominant mechanisms in the adsorption process. Results confirmed that AMSM adsorbent has the potential to be a suitable candidate for Cd(II) removal from aqueous solutions

Emotional Labour of Caring for Hematopoietic Stem Cell Transplantation Patients: Iranian Nurses’ Experiences

Vahid Zamanzadeh,Leila Valizadeh,Leila Sayadi,Fariba Taleghani,Fuchsia Howard,Alireza Jeddian 한국간호과학회 2013 Asian Nursing Research Vol.7 No.2

Purpose: The purpose of this study was to describe the emotional labour experienced by nurses who care for hematopoietic stem cell transplantation (HSCT) patients in Iran. Methods: Eighteen nurses participated in semi-structured interviews. The interviews were analyzed using qualitative content analysis methods. Results: Three main categories described the emotional labour involved, namely, emotional intimacy, feeling overwhelmed with the sadness and suffering, and changing self. Nurses had compassion for their patients, contributing to a close nurse-patient relationship. The nurses’ emotional labour resulted in their feeling overwhelmed with sadness and suffering. Five subcategories described this emotional toll: (a) witnessing suffering, (b) struggling mentally, (c) hurting emotionally, (d) feeling drained of energy, and (e) escaping grief. Dealing with death and dying on an ongoing basis promoted the nurses’ changing self. Conclusion: Iranian nurses who care for HSCT patients experience a range of positive and negative emotions. Establishing appropriate support systems for nurses might help mediate the negative aspects of emotional labour. thereby improving nursing work life and ultimately the quality of patient care. Purpose: The purpose of this study was to describe the emotional labour experienced by nurses who care for hematopoietic stem cell transplantation (HSCT) patients in Iran. Methods: Eighteen nurses participated in semi-structured interviews. The interviews were analyzed using qualitative content analysis methods. Results: Three main categories described the emotional labour involved, namely, emotional intimacy, feeling overwhelmed with the sadness and suffering, and changing self. Nurses had compassion for their patients, contributing to a close nurse-patient relationship. The nurses’ emotional labour resulted in their feeling overwhelmed with sadness and suffering. Five subcategories described this emotional toll: (a) witnessing suffering, (b) struggling mentally, (c) hurting emotionally, (d) feeling drained of energy, and (e) escaping grief. Dealing with death and dying on an ongoing basis promoted the nurses’ changing self. Conclusion: Iranian nurses who care for HSCT patients experience a range of positive and negative emotions. Establishing appropriate support systems for nurses might help mediate the negative aspects of emotional labour. thereby improving nursing work life and ultimately the quality of patient care.