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- 저자 : Somani, Rozina (검색결과 6 건)
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Carbon nanofibers and multiwalled carbon nanotubes from camphor and their field electron emission
Savita P. Somani,Prakash R. Somani,M. Tanemura,S.P. Lau,M. Umeno 한국물리학회 2009 Current Applied Physics Vol.9 No.1
Vertically aligned carbon nanofibers (CNF) and multiwalled carbon nanotubes (MWCN) have been synthesized from camphor by catalytic thermal CVD method on Co and Co/Fe thin films (for CNF) and on silicon substrates using a mixture of camphor and ferrocene (for MWCN). CNF and MWCN are studied by field emission scanning electron microscopy, high-resolution transmission electron microscopy, visible Raman spectroscopy, X-ray diffraction in order to get insight into the microstructure and morphology of these materials. Field electron emission study indicates turn-on field of about 2.56, 3.0 and 6.5 V/㎛ for MWCN, Co/CNF and Co/Fe/CNF films, respectively. The best performance of MWCN in field electron emission among the materials studied can be due to the highest aspect ratio, good graphitization and good density. Vertically aligned carbon nanofibers (CNF) and multiwalled carbon nanotubes (MWCN) have been synthesized from camphor by catalytic thermal CVD method on Co and Co/Fe thin films (for CNF) and on silicon substrates using a mixture of camphor and ferrocene (for MWCN). CNF and MWCN are studied by field emission scanning electron microscopy, high-resolution transmission electron microscopy, visible Raman spectroscopy, X-ray diffraction in order to get insight into the microstructure and morphology of these materials. Field electron emission study indicates turn-on field of about 2.56, 3.0 and 6.5 V/㎛ for MWCN, Co/CNF and Co/Fe/CNF films, respectively. The best performance of MWCN in field electron emission among the materials studied can be due to the highest aspect ratio, good graphitization and good density.
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Somani, Rozina,Muntaner, Carles,Hillan, Edith,Velonis, Alisa J.,Smith, Peter Occupational Safety and Health Research Institute 2021 Safety and health at work Vol.12 No.3
Workplace violence (WPV) is an increasing cause of concern around the globe, and healthcare organizations are no exception. Nurses may be subject to all kinds of workplace violence due to their frontline position in healthcare settings. The purpose of this systematic review is to identify and consider different interventions that aim to decrease the magnitude/prevalence of workplace violence against nurses. The standard method by Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA, 2009) has been used to collect data and assess methodological quality. Altogether, twenty-six studies are included in the review. The intervention procedures they report on can be grouped into three categories: stand-alone trainings designed to educate nurses; more structured education programs, which are broader in scope and often include opportunities to practice skills learned during the program; multicomponent interventions, which often include organizational changes, such as the introduction of workplace violence reporting systems, in addition to workplace violence training for nurses. By comparing the findings, a clear picture emerges; while standalone training and structured education programs can have a positive impact, the impact is unfortunately limited. In order to effectively combat workplace violence against nurses, healthcare organizations must implement multicomponent interventions, ideally involving all stakeholders.
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Sumit Ghosh,Mahesh Chandra Somani,Daria Setman,Suhrit Mula 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
An effort has been made to establish a relation between Zener–Hollomon parameter, flow stress and dynamic recrystallization(DRX). In this context, the plastic flow behavior of Ti + Nb stabilized interstitial free (IF) steel was investigated in atemperature range of 650–1100 °C and at constant true strain rates in the range 10−3–10 s−1, to a total true strain of 0.7. Theflow stress curves can be categorized into two distinct types, i.e. with/without the presence of steady-state flow followingpeak stress behavior. A novel constitutive model comprising the strain effect on the activation energy of DRX and othermaterial constants has been established to predict the constitutive flow behavior of the IF steel in both α and γ phase regions,separately. Predicted flow stress seems to correlate well with the experimental data both in γ and α phase regions with ahigh correlation coefficient (0.982 and 0.936, respectively) and low average absolute relative error (7 and 11%, respectively)showing excellent fitting. A detailed analysis of the flow stress, activation energy of DRX and stress exponent in accord withthe modelled equations suggests that dislocation glide controlled by dislocation climb is the dominant mechanism for theDRX, as confirmed by the transmission electron microscopy analysis.
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Tarik Emre Sener,Yiloren Tanidir,Serap Ketenci,Umut Kutukoglu,Dogancan Dorucu,Huseyin Cayir,Amelia Pietropaolo,Esteban Emiliani,Bhaskar Somani 대한비뇨의학회 2023 Investigative and Clinical Urology Vol.64 No.5
Purpose: Radiation exposure is affected by C-arm fluoroscopy device positioning during percutaneous renal puncture. Our aim was to compare the exposure of surgeon's lens, hand and chest with a fluoroscopy protocol replicated in different C-arm positions. Materials and Methods: A standardized fluoroscopy protocol was created using water-equivalent solid phantoms to replicate a surgeon and patient. 111 mGy radiation (360 s) was applied in standard fluoroscopy mode (91 kVp, 2.7 mA/mAs). Dosimeters were placed on lens, chest and hand of surgeon and patient phantom models. 7 different C-arm positions were created: 0°, mediolateral (ML) +90°, ML -90°, ML +30°, ML -15°, craniocaudal (CC) +30°, CC +15°. Measurements were evaluated separately for different positions. Results: The highest radiation exposure was measured on patient dosimeter (2.97 mSv). The highest exposure on surgeon was recorded on finger dosimeter in all C-arm positions; highest dose was recorded in ML +90° position (2.88 mSv). In finger dosimeters, lowest exposure was recorded in 0° position (0.51 mSv). The lowest exposure of all positions was measured in chest dosimeter in ML -90° position (0.24 mSv). Conclusions: In positions where X-ray generator of the C-arm was facing towards the surgeon, radiation exposure measured in all dosimeters was higher compared to positions where the generator was facing away. The hand radiation exposure in all positions was higher than chest and lens. Special care must be taken to avoid facing the X-ray generator tube and hands should be as well-protected as chest and eyes with special protective gear.
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