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Surabhi Joshi,Ashwini S,Chintan Joshi 대한치주과학회 2013 Journal of Periodontal & Implant Science Vol.43 No.6
Purpose: In this study, the effect of calcium sodium phosphosilicate (NovaMin) desensitizing agent, which is a powder-basedsystem, and hydroxyethyl methacrylate and glutaraldehyde (Gluma desensitizer), which is liquid-based system, on dentinaltubule occlusion was analyzed by scanning electron microscope. The effects of the above two along with one control groupwere compared to determine the more effective method of sealing the dentinal tubules after initial application. Methods: Twenty specimens were allocated to each of 3 groups: Control, Gluma desensitizer, and NovaMin. Two additionalsamples were also prepared and treated with Gluma and NovaMin; these samples were longitudinally fractured. The specimenswere prepared from extracted sound human premolars and were stored in 10% formalin at room temperature. The teethwere cleaned of gross debris and then sectioned to provide one to two dentin specimens. The dentin specimens were etchedwith 6% citric acid for 2 minutes and rinsed in distilled water. Control discs were dried, and the test discs were treated withthe desensitizing agents as per the manufacturer’s instructions. The discs as well as longitudinal sections were later analyzedunder the scanning electron microscope. The proportions of completely occluded, partially occluded, and open tubules withineach group were calculated. The ratios of completely and partially occluded tubules to the total tubules for all the groups wasdetermined, and the data was statistically analyzed using nonparametric tests and statistical significance was calculated. Results: NovaMin showed more completely occluded tubules (0.545±0.051) while Gluma desensitizer showed more partiallyoccluded tubules (0.532±0.075). The differences among all the groups were statistically significant (P≤ 0.05). Conclusion: Both materials were effective in occluding dentinal tubules but NovaMin appeared more promising in occludingtubules completely after initial application.
Fill factor controlled nanoimprinted ZnO nanowires based on atomic layer deposition
Surabhi, Srivathsava,Luong, Chi Hieu,Kim, Min Yi,Van, Phuoc Cao,Quoc, Viet Dong,Kuchi, Rambabu,Lee, Jae-Woong,Chang, Hyo-Sik,Jeong, Jong-Ryul ELSEVIER 2018 Current Applied Physics Vol.18 No.6
<P><B>Abstract</B></P> <P>Enhanced diffraction by sub-wavelength nanostructures to convert incident electromagnetic radiation into waveguide modes has applications in anti-reflective coatings for optoelectronic devices. We propose a metal oxide (ZnO) nanowire grid polarizer as such a nanostructure, fabricated by ultraviolet nanoimprint lithography and whose fill factor (FF) is controlled by atomic layer deposition. Using finite difference time domain simulations, we investigated the polarization-dependent optical transmittance of the structures and calculated the polarizing efficiency. Optical profiles such as electric and magnetic field intensity and current density distributions of specific FF nanopatterns were determined for the transverse magnetic and transverse electric modes. The effects of geometrical parameters including the wire-grid period, fill ratio, and spacing between the wire-grid layers on diffraction wavelength were characterized. Respective FF-controlled ZnO nanowire structures were fabricated and their experimental optical transmittances were measured for nanowire grid polarizer applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fill factor (FF) controlled ZnO nanowires (NW) through atomic layer deposition (ALD), combined with UV-NIL were prepared. </LI> <LI> Polarizing efficiency of NWs has increased with ALD thickness at which stronger diffraction wavelengths are observed. </LI> <LI> ALD enables us to control the fill factor precisely in nanowire grid polarizer. </LI> <LI> Simulation results supported by experiments confirm that the proposed FF controlled ZnO NWs can be efficient polarizers. </LI> </UL> </P>
Surabhi Shrivastava,Laxmi Shrivastava 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.3
The characteristic of changing topology without a fixed infrastructure and lacking of any centralization is mobile adhoc networking (MANET).The communication between mobile nodes uses multihop wireless links. In the network; nodes act as router and forwarding data packets to other nodes behaving as intermediate node. Routing protocols plays an important role to facilitate communication within the network. In this paper we have compared different transmission power by varying antenna height. Simulation results shown in AODV routing protocol in term of the metrics: Throughput, Average end to end delay, Average jitter. The results are showing various changes due to change in the selected parameters, which are performance parameters of the network.
Maternal exposure factors during pregnancy associated with prenatal lead exposure
Surabhi Shah Kulkarni,Byung-Mi Kim(김병미),Eunjeong Kim(김은정),Hye Sook Park(박혜숙),Yun-Chul Hong(홍윤철),Mina Ha(하미나),Yangho Kim(김양호),Boong-Nnyun Kim(김붕년),Namsoo Chang(장남수),Eun-Hee Ha(하은희) 환경독성보건학회 2014 한국독성학회 심포지움 및 학술발표회 Vol.2014 No.5
Sengar, Surabhi,Singh, S.B. The Korean Reliability Society 2012 International Journal of Reliability and Applicati Vol.13 No.1
This Paper deals with the stochastic behavior and failure analysis of a Viscose Staple Fibre Plant which produces fibre for making clothes. The fibre making plant is a complex system with various subsystems as: Vendor (supplies Charcoal and Sulphur, raw materials for the process), Carbon di sulphide Plant, Acid Plant, Pulp Plant and Processing Plant. The considered system can completely fail due to failure of any of the subsystems. The Carbon di Sulphide Plant can fail in two different ways, due to lack of Sulphur or Charcoal. Processing Plant has the configuration 5-out-of-10: d and 6-out-of-10: f. It is also assumed that the system can fail due to workers strike and catastrophic failure. All failures follow exponential time distribution whereas all repairs follow general time distribution. Preventive Maintenance policy has been applied to reduce the failure in the system. Various reliability characteristics such as transition state probabilities, steady state behavior, reliability, availability, M.T.T.F and the cost analysis have been obtained using supplementary variable technique and Gumbel-Hougaard copula methodology.
Fill factor controlled nanoimprinted ZnO nanowires based on atomic layer deposition
Srivathsava Surabhi,Chi Hieu Luong,김민이,Phuoc Cao Van,Viet Dongquoc,Rambabu Kuchi,이재웅,장효식,정종율 한국물리학회 2018 Current Applied Physics Vol.18 No.6
Enhanced diffraction by sub-wavelength nanostructures to convert incident electromagnetic radiation into waveguide modes has applications in anti-reflective coatings for optoelectronic devices. We propose a metal oxide (ZnO) nanowire grid polarizer as such a nanostructure, fabricated by ultraviolet nanoimprint lithography and whose fill factor (FF) is controlled by atomic layer deposition. Using finite difference time domain simulations, we investigated the polarization-dependent optical transmittance of the structures and calculated the polarizing efficiency. Optical profiles such as electric and magnetic field intensity and current density distributions of specific FF nanopatterns were determined for the transverse magnetic and transverse electric modes. The effects of geometrical parameters including the wire-grid period, fill ratio, and spacing between the wire-grid layers on diffraction wavelength were characterized. Respective FF-controlled ZnO nanowire structures were fabricated and their experimental optical transmittances were measured for nanowire grid polarizer applications.