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Islam, S.
- Measurement of Bronsted Acidity of Silica-Alumina Solid Catalyst by Base Exchange Method
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1 Department of Applied Chemistry and Chemical Technology, University of Rajshahi, Rajshahi 6205, BD
1 Department of Applied Chemistry and Chemical Technology, University of Rajshahi, Rajshahi 6205, BD
Source
Journal of Surface Science and Technology, Vol 22, No 1-2 (2006), Pagination: 25-33Abstract
Silica-Alumina catalysts having three different Si/Al ratios were prepared. Surface acidity of these catalyst samples was measured by the base exchange method using aqueous ammonium acetate, CH3COONH4 solution and the results were compared with those measured by the base exchange method using KOH and NH4OH as adsorbates from aqueous solution. The amount of K4 and NH4+ adsorbed was determined titrimetrically and spectrophotometrically, respectively for measuring the concentration of K+ and NH4+ in the solution before and after adsorption. It was found that the surface acidity was more pronounced when ammonium acetate solution was used as an adsorbate. With the use of NH4OH and KOH as bases considerable dealumination takes place with a consequent decrease of surface acidity of the catalyst samples. In all cases, the surface acidity increased with decrease of sample size. It is seen that surface acidity measured with NH4OH becomes closer to that measured with KOH at the same(?) Si/Al ratio, but contrary to this, surface acidity measured with NH4OH becomes closer to that measured with CH3COONH4 at high Si/Al ratio. This phenomenon is attributed to dealumination of silica-alumina catalyst samples by the strong base.Keywords
Surface Acidity, Silica-Alumina Catalysts, Bronsted Acidity, Base Exchange.
- Hydrochemistry and Classification of Groundwater, Rajshahi City Corporation Area, Bangladesh
Abstract Views :164 |
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Authors
Affiliations
1 Department of Geology and Mining, University of Rajshahi, Rajshahi - 6205, BD
1 Department of Geology and Mining, University of Rajshahi, Rajshahi - 6205, BD
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 60, No 4 (2002), Pagination: 411-418Abstract
Hydrochemistry of Rajshahi City Corporation (RCC) area is dominated by alkaline earths and weak acids. Total concentration of all major ions in groundwater increases at the end of the monsoon in comparison to that at the end of the pre-monsoon. The groundwater is of calcium-sodium and bicarbonate-chloride facies at the end of the lean pcriod, which changes into calcium-magnesium and bicarbonate facies at the end of the monsoon. Groundwater of the area is classified as "normal chloride", "normal sulphate" and "super carbonate" water. The groundwater here is suitable for livestock consumption and partially suitable for drinking and public health.Keywords
Groundwater, Hydrochemistry, Monsoon, Rajshahi City, Bangladesh.- Ferrography—A Tool for Failure Analysis
Abstract Views :161 |
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Authors
Affiliations
1 Central Mechanical Engineering Research Institute, Durgapur-9, West Bengal, IN
1 Central Mechanical Engineering Research Institute, Durgapur-9, West Bengal, IN
Source
Journal of the Association of Engineers, India, Vol 62, No Spl (1987), Pagination: 21-26Abstract
With the advent of new technologies, modern machineries have become very complex in nature. Every year a large chunk,of money is consumed for withdrawing machines from service due to breakdown and maintenance. Ferrography can extract valuable information about machine-health while it is in running condition. These information are very vital for planning machine operation and scheduling maintenance time in order to achieve maximum reliability, safety and economy of production. Out of the four basic methods of Condition Monitoring, namely, visual, performance, vibration and wear debris analysis, ferrography deals with the last one.- Performance Evaluation of Private Clouds:OpenStack Vs Eucalyptus
Abstract Views :152 |
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Authors
Affiliations
1 Department of Computer Engineering, Aligarh Muslim University, Aligarh, Uttar Pradesh, IN
1 Department of Computer Engineering, Aligarh Muslim University, Aligarh, Uttar Pradesh, IN
Source
International Journal of Distributed and Cloud Computing, Vol 6, No 1 (2018), Pagination: 29-36Abstract
With the rapid growth of cloud infrastructure in the organizations, more applications are dependent on the quality of services like network, disk, memory, processor. Due to this, many organizations drift towards choosing right cloud for deploying the application which caters to user’s needs. Currently, opensource cloud platforms (OpenStack, Eucalyptus, Cloudstack, Opennebula etc) are gaining a lot of popularity that establishes private cloud with low cost. But it is difficult for organizations to choose a platform suitable for hosting web application or running virtual machines for high availability. This paper focuses on choosing right cloud platform for network, disk, processor, and memory in running application specific to user’s need. The efficacy of our method is validated through a series of experiments which consists of benchmarking the performance of OpenStack and Eucalyptus opensource private clouds. The experimental result shows that Eucalyptus cloud performs better for Network, Memory and Processing operations while OpenStack cloud performs better for Disk I/O operations.Keywords
Benchmarks, Cloud, Eucalyptus, OpenStack.References
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