http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Structural and electrical properties of microwave -processed BaTiO3 ceramics
ChandraPrakash,O.P.Thakur,D.K.Agrawal 한양대학교 세라믹연구소 2002 Journal of Ceramic Processing Research Vol.3 No.2
Barium titanate (BaTiO3) was synthesized and sintered by microwave processing at 2.45 GHz. Appropriate amounts of BaCO3 and TiO2 were used as starting materials for the synthesis. BaTiO3 phase was obtained by heating the precursors in a multimode microwave cavity at 1450oC for just 25 minutes. The synthesis and sintering were carried out in air. A relative density of 97% was obtained. By contrast, it was found that to achieve the same densification, it required 4 hours of soaking at 1450oC in a conventional sintering process. The dielectric properties show the abrupt discontinuities in dielectric constant vs. temperature plots; typical properties of first order transitions. Above the Curie temperature the dielectric constant follows Curie-Weiss law with Curie constant C=1.3-1.4´105 oC.
Quantitative Analysis of Growth of Cells on Physicochemically Modified Surfaces
Chandra, Prakash,Kim, Jihee,Rhee, Seog Woo Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.2
In this study, we describe the most expected behavior of cells on the modified surface and the correlation between the modified substrates and the response of cells. The physicochemical characteristics of substrates played an essential role in the adhesion and proliferation of cells. Glass and polymer substrates were modified using air plasma oxidation, and the surfaces were coated with self-assembled monolayer molecules of silanes. The PDMS substrates embedded with parallel micropatterns were used for evaluation of the effect of topologically modified substrate on cellular behaviour. BALB/3T3 fibroblast cells were cultured on different surfaces with distinct wettability and topology, and the growth rates and morphological change of cells were analyzed. Finally, we found the optimum conditions for the adhesion and proliferation of cells on the modified surface. This study will provide insight into the cell-surface interaction and contribute to tissue engineering applications.
Studies of the dielectric and ferroelectric properties of PZT: NZF magnetoelectric composites
Chandra Prakash,J.K. Juneja,K.K. Raina,Chandra Prakash 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.1
Piezoelectric-magnetostrictive (magnetoelectric) composites using piezoelectric lead zirconate titanate (PZT) ceramic and magnetostrictive Ni-Zn ferrite (NZF) with compositional formulae (1-x) PbZr0.65Ti0.35O3-x Ni0.8Zn0.2Fe2O4 with x = 0 to 0.15 in steps of 0.05, were prepared by a conventional solid state route. The presence of individual phases was confirmed using X-ray diffraction. Dielectric properties were studied as a function of temperature and frequency presuming that the interactions between the piezoelectric and magnetostrictive phases may result in various anomalies in the dielectric properties of these composites. To study the ferroelectric properties, P-E hysteresis loops were recorded.
Lasitha B Samarakoon,Samip Chandraprakash,Rolands Fernandes,Pradeep Basnyat 대한외상중환자외과학회 2022 Journal of Acute Care Surgery Vol.12 No.3
Preperitoneal hernia is a very rare complication following laparoscopic inguinal hernia repair. A 57-year-old male underwent a right inguinal hernia totally extra peritoneal repair on 20/10/2021. Initial recovery was uncomplicated but on post operative day 10, he developed sudden onset of vomiting and abdominal pain. Initial imaging showed small bowel obstruction with a possible transition point. An internal hernia was suspected and he was offered urgent diagnostic laparoscopy following counseling. A preperitoneal defect was noted with distended proximal ileum and collapsed distal ileum and colon. A small bowel run-through did not reveal any pathological abnormalities. A presumptive diagnosis of a preperitoneal hernia was made, and the defect was closed with a running V lock suture. The patient made an uneventful postoperative recovery. An inadvertent breach in the peritoneum during a totally extra peritoneal repair can lead to preperitoneal herniation of the small bowel and intestinal obstruction postoperatively.