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Sanal, Irem,Yalcin, Bestenur,Yalcin, Ibrahim Ertugrul,Arda, Lutfi Techno-Press 2021 Advances in concrete construction Vol.11 No.4
The main objective of this study is to characterize and evaluate the hydrophobic performance of polymer-based water-repellent coatings on cementitious mortar surfaces. Different concentrations of poly(vinyl acetate) (PVAc) and poly(1,4-butylene adipate) (PBA) were prepared in the laboratory and their applicability and performance was tested experimentally by water absorption test and analysis of surface contact angles of cementitious mortar specimens. According to the results of this study, it can be stated that incorporation of nano polymer particles on the surface of cementitious mortar specimens can enhance contact angles and reduce water absorption by increasing hydrophobicity. However, a dosage limit exists for polymer materials in coating, and observed hydrophobic improvements decreases when polymer dosage reached beyond the limit. Additionally, it is observed that water absorption of polymer coated cementitious mortars is closely related with the results of surface contact angle.
Pelvic Hydatid Disease: CT and MRI Findings Causing Sciatica
Hatice Tuba Sanal,Murat Kocaoglu,Nail Bulakbasi,Duzgun Yildirim 대한영상의학회 2007 Korean Journal of Radiology Vol.8 No.6
Pelvic masses, especially hydatid disease, rarely present with sciatica (1, 2). We present the computed tomography (CT) and the magnetic resonance imaging (MRI) findings of a 49-year-old female patient with presacral hydatid disease, who was evaluated for her sciatica. We also want to emphasize the importance of assessing the pelvis of patients with symptoms and clinical findings that are inconsistent and that cannot be satisfactorily explained by the spinal imaging findings.
A Parametric Study of the Dump Diffuser Flow
V.R. Sanal Kumar,S. Deshpande,김희동(H.D. Kim),T. Setoguchi 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The dump diffuser produces a stable flow pattern under a wide range of operating conditions. Many experimental and numerical studies have been reported on dump diffuser flows with tremendous insight on critical flow features. Nevertheless, the design optimization of dump diffuser is still an emerging field in the modern aircraft industry. Towards meeting the design objectives, using a two-dimensional standard k-ε turbulence model, in this paper parametric studies have been carried out to examine the flow features through a straight-walled pre-diffuser with a dump.
Shear bond strengths of aged and non-aged CAD/CAM materials after different surface treatments
Hamiyet Kilinc,Fatma Ayse Sanal,Sedanur Turgut 대한치과보철학회 2020 The Journal of Advanced Prosthodontics Vol.12 No.5
PURPOSE. To assess shear bond strengths (SBS) of resin composites on aged and non-aged prosthetic materials with various surface treatments. MATERIALS AND METHODS. Cerasmart (CE), Vita Enamic (VE), Vita Mark II (VM), and IPS e.max CAD (EC) blocks were sliced, and rectangular-shaped specimens (14 × 12 × 1.5 mm; N = 352) were obtained. Half of the specimens were aged (5000 thermal cycles) for each material. Non-aged and aged specimens were divided into 4 groups according to the surface treatments (control, air abrasion, etching, and laser irradiation; n = 11) and processed for scanning electron microscopy (SEM). The repair procedure was performed after the surface treatments. SBS values and failure types were determined. Obtained data were statistically analyzed (P≤.05). RESULTS. The material type, surface treatment type, and their interactions were found significant with regard to SBS (P<.001). Aging also had a significant effect on prosthetic material-resin composite bonding (P<.001). SBS values of non-aged specimens ranged from 12.16 to 17.91 MPa, while SBS values of aged specimens ranged from 9.46 to 15.61 MPa. Non-aged VM in combination with acid etching presented the highest score while the control group of aged CE showed the lowest. CONCLUSION. Etching was more effective in achieving durable SBS for VM and EC. Laser irradiation could be considered as an alternative surface treatment method to air abrasion for all tested materials. Aging had significant effect on SBS values generated between tested materials and resin composite.
적외선 카메라를 이용한 초음속 충돌 동축제트의 벽면 온도 측정
곽종호(Jong-Ho Gwak),V. R. Sanal Kumar,김희동(Heuy-Dong Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The supersonic impinging jet has been extensively applied to rocket launching system, gas jet cutting control, gas turbine blade cooling, etc. In such applications, wall temperature of an object on which supersonic jet impinges is a very important factor to determine the performance and life of the device. However, wall temperature data of supersonic impinging jets are not enough to data. The present study describes an experimental work to measure the wall temperatures of a vertical flat plate on which supersonic, dual, coaxial jet impinges. An Infrared camera is employed to measure the wall temperature distribution on the impinging plate. The pressure ratio of the jet is varied to obtain the supersonic jets in the range of over-expanded to moderately under-expanded conditions at the exit of coaxial nozzle. The distance between the coaxial nozzle and the flat plate was also varied. The coaxial jet flows are visualized using a Shadow optical method. The results show that the wall temperature distribution of the impinging plate is strongly dependent on the jet pressure ratio and the distance between the nozzle and plate.
Coflow-Counterflow개념을 이용한 추력벡터 노즐에서 발생하는 유동특성에 관한 연구
정성재(Sung-Jae Jung),V. R. Sanal Kumar,김희동(Heuy-Dong Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Thrust vector control using a coflow-counterflow concept is achieved by suction and blowing through a<br/> slot adjacent to a primary jet which is shrouded by a suction collar. In the present study, the flow<br/> characteristics of thrust vectoring is investigated using a numerical method. The nozzle has a design Mach<br/> number of 2.0, and the operation pressure ratio is varied to obtain various flow features of the nozzle flow.<br/> Test conditions are in the range of the nozzle pressure ratio from 6.0 to 10.0, and a suction pressure from<br/> 90kPa to 35kPa. Two-dimensional, compressible Navier-Stokes computations are conducted with RNG k-ε<br/> turbulence model. The computational results provide an understanding of the detailed physics of the thrust<br/> vectoring process. It is found that an increase in the nozzle pressure ratio leads to increased thrust efficiency<br/> but reduces the thrust vector angle.