http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
( Ajay ),홍창국 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Here we propose a general approach for preparation of graphene-AESO polymer composite. By taking advantage of the unique amphiphilic structure of graphene oxide (GOSs), we developed a new polymer blend of acrylated epoxidized soybean oil (AESO) and graphene oxide via in situ polymerization. The composites were characterized by FTIR, 1H-NMR and Raman spectroscopy and XRD,SEM,TGA and DSC. This composite exhibits a percolation threshold of ~0.3 volume percent for room temperature electrical conductivity. Which is the lowest value of the percolation threshold than reported for other polymer carbon composites excepting for that of carbon nanotubes composites. Such low percolation value is sufficient for many electrical applications.
( Ajay ),홍창국 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Stable dispersions of silane coupled graphene oxide in an acrylated epoxidized soy oil (AESO) based thermosetting resin were obtained by mechanical stirring. The thermo-mechanical properties of the polymerized samples measured by DMA. Which shows an improved storage modulus by ~30% for 0.5 wt % GO loading. Higher filler loadings resulted in significant aggregation during polymerization. Wide-angle X-ray scattering, optical microscopy, and transmission electron microscopy (TEM) demonstrated the formation of aggregates at higher filler loads, which reversed the potential for mechanical improvement. Whereas, TEM showed good intercalation of the polymer matrix with GO flexes which is improving much more properties collectively.
( Ajay ),( Sawanta S. Mali ),홍창국 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Graphite oxide and carbon black nanocomposites as bipolar plates for polymer electrolyte membrane fuel cells (PEMFCs) are developed by compression molding technique. It is found that composite bipolar plate with a varying weight percent of resin and GO gives the high electrical conductivity, competitive mechanical properties with increased bulk density and air tightness. The GO/CB-based composites with 40-45 wt % of resin are suitable for achieving desired properties of the bipolar plate as per the DOE advanced series target. The addition of 5 wt % of carbon black is helpful for improving the electrical conductivity without compromising other properties of the bipolar plate compared to graphite-resin-based composite plates.
( Ajay ),홍창국 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
In literature it was seen that natural properties of Elaiocarpus Ganitrus Roxb (Rudraksha) were studied extensively and no detail study was founded on magnetic properties of Rudraksha. Initial study showed that Rudraksha is highly magnetic as △W/M ㅁ 2 so in this work we have tried to apply TGA (Thermogravimetric Analysis) to prepare different magnetic material from Rudrakasha showed 9 plateaus in temperature range 303K to 773K. The IR study for compound obtained various plateaus confirmed that may were different compounds. When their magnetic properties study using Gouys Balance. It was observed that we can obtained magnetic material with high and low magnetic susceptibility.
( Ajay ),( Chang Kook Hong ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
A green approach to produce bulk amount rGO using Graphene Oxide via Ball Milling in presence of Zinc. Furthermore, the extent of reduction of GO in the present strategy is much higher than that in the different approaches using metallic Zinc and NaOH, indicating a cooperativity between friction generated during milling and chemical reactions. To verify the applicability, we have examined the impact of rGO on the improvement of thermo-mechanical properties of Epoxy nanocomposites. Here, few layered rGO based Epoxy nanocomposites were obtained. Here rGO apparently filled in the interspaces of polymeric chains, which increments in thermo-mechanical properties of nanocomposites even with low loading of rGO.
Experimental and mathematical analysis of simulation results for sheet metal parts in deep drawing
Ajay Kumar Choubey,Geeta Agnihotri,C. Sasikumar 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.9
In this paper, deep drawing of conical and cylindrical cups without blank holder is investigated using a conical die design. These cups are produced by pushing circular blanks by pushing the flat head punch in a single stroke. ANSYS APDL 14.0 was then used to investigate the effects of die and punch geometry, half-cone angle, die and punch fillet radius, and drawing load. The thickness distribution of the cup was numerically investigated to determine the optimal process design, and mathematical analysis was adopted to determine the thickness distribution and longitudinal stress calculation. An experimental set-up was designed to validate the simulation results for conical and cylindrical shaped sheet-metal cups. Tensile tests were carried out to obtain the flow of the stress-strain curve for the simulation. The drawing characteristics of materials were investigated by performing Erichsen cupping and Vickers hardness tests. Experiments were conducted on blanks of aluminum alloys and stainless steel with initial thicknesses of 1.5 mm. A cylindrical cup of ss304 with LDR of up to 2.2 and conical cup of AA1100 with LDR of up to 2.7 were successfully achieved. Finite element simulation results showed good agreement with the mathematical and experimental results.
Pneumothorax after Colonoscopy – A Review of Literature
Ajay Gupta,Hammad Zaidi,Khalid Habib 대한소화기내시경학회 2017 Clinical Endoscopy Vol.50 No.5
The purpose of this study was to determine the anatomical aspects, mechanisms, risk factors and appropriate management of development of pneumothorax during a routine colonoscopy. A systematic search of the literature (MEDLINE, Embase and Google Scholar) revealed 21 individually documented patients of pneumothorax following a colonoscopy, published till December 2015. One additional patient treated at our center was added. A pooled analysis of these 22 patients was performed including patient characteristics, indication of colonoscopy, any added procedure, presenting symptoms,risk factors and treatment given. The review suggested that various risk factors may be female gender, therapeutic interventions, difficult colonoscopy and underlying bowel pathology. Diagnosis of this condition requires a high index of suspicion and treatment should be tailored to individual needs.
Review of international wind codes and recent research on mono-slope canopy roof
Ajay Pratap Singh,Neelam Rani 한국풍공학회 2022 Wind and Structures, An International Journal (WAS Vol.34 No.4
Buildings with mono-sloped roofs are used for different purposes like at railway platforms, restaurants, industrial buildings, etc. Between two types of mono-slope roofs, clad and unclad, unclad canopy types are more vulnerable to wind load as wind produces pressure on both upper and lower surfaces of the roof, resulting in uplifting of the roof surface. This paper discusses the provisions of wind loads in different codes and standards for Low-rise buildings. Further, the pressure coefficients on mono-slope canopy roof available in wind code and standards are compared. Previous experimental studies for mono-slope canopy roof along with the recent wind tunnel testing carried out at Indian Institute of Technology, Roorkee is briefly discussed and compared with the available wind codes. From the study it can further be asserted that the information available related to staging or blocking under the mono-slope canopy roofs is limited. This paper is an attempt to put together the available information in different wind codes/standards and the research works carried out by different researchers, along with shedding some light on the future scopes of research on mono-slope canopy roofs.