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Institution

Ghulam Ishaq Khan Institute of Engineering Sciences and Technology

EducationTopi, Pakistan
About: Ghulam Ishaq Khan Institute of Engineering Sciences and Technology is a education organization based out in Topi, Pakistan. It is known for research contribution in the topics: Quantum efficiency & Diode. The organization has 618 authors who have published 940 publications receiving 10674 citations.


Papers
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Journal ArticleDOI
08 Mar 2021-Silicon
TL;DR: In this paper, the behavior of silica based geopolymeric material (22-28%Si) from granitic waste was studied, and the results confirmed the correctness of the results.
Abstract: This research aims to study the behavior of silica based geopolymeric material (22–28%Si) from granitic waste. Granitic waste in powder form was used as main precursor in combination of activating alkaline-solution (18% Na2SiO3, 7% NaOH and 75% distilled water). The ratio between Na2SiO3 and NaOH was kept constant (2.57) in all experiments to achieve appropriate geopolymerization but solid to liquid ratio was varied. Five different compositions of geopolymeric material were prepared with varying proportions of granite waste in the range of 70–78%, combined-alkaline-solution in range of 28–20% and 2% water. Curing of the samples was done in a heating oven at 70 °C for 24 h. After that samples were de-moulded and placed in a heating furnace for further curing at 220 °C for 2 h. After curing, compressive strength, density (bulk, apparent and true) and porosity (open, close and total) were measured. Phase analysis, degree of geopolymerization and microstructural analysis were evaluated by XRF (X-ray Fluorescence), FTIR (Fourier Transform Infrared Spectroscopy) and SEM (Scanning Electron Microscopy), respectively. XRF analysis revealed 28.38% Si and 5.96% Al which are the main constituents for the synthesis of geopolymer. Maximum achieved compressive strength was 22 MPa with minimum porosity of 19.487% in 78% granite based geopolymer. Minimum bulk density of 1.441 g/cm3 was achieved using 70% granite waste. FTIR results confirmed geopolymerization and optimized composition in the resultant samples which is 78% granite and 20% combined-alkaline-solution. Further, SEM results revealed most homogenous and dense structure in the same composition. The durability of the geopolymeric samples was evaluated by water absorption index. Maximum water absorption index of 3.09 was found in 72% granite based sample having 26.79% Si while minimum 2.018 in 78% granite based geopolymeric material having 22.97% Si. Positive compositional effect on various construction properties has been achieved in this study.

7 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of a samarium addition on the shape memory behavior of Fe-14Mn-3Si-10Cr-5Ni (wt%) alloys has been studied.
Abstract: The effect of a samarium addition on the shape memory behavior of Fe–14Mn–3Si–10Cr–5Ni (wt%) alloys has been studied. It is found that the addition of samarium resulted in 27% increase in the shape memory effect. It was noticed that the addition of samarium had also improved the mechanical properties, increased c / a ratios and inhibited the formation of ά which is considered detrimental for the shape memory behavior. The results of alloys with and without samarium additions are compared to elucidate the beneficial response of samarium.

7 citations

Book ChapterDOI
01 Jan 2020
TL;DR: In this paper, the authors explored the electrochemical technologies and their application towards treatment of antibiotics and found that electrochemical technology has some advantages over the other oxidation processes, like easily operation, high efficiency, coupling with other process, and low temperature required for its operation; moreover it can be powered with the help of solar panel to decrease the energy consumption.
Abstract: Antibiotics are vital for the healthcare of human and animals; these products are used to prevent, alleviate and cure disease and give a better way of living. However, after administration a large fraction of these products are excreted unchanged into water bodies, and nobody knows about the ultimate destination of these chemical compounds. Similarly the possible adverse effects due to the presence of these chemical to environment and human health are unknown due to lack of information. Most of the antibiotics products are reached to water bodies unaltered and known as active pharmaceutical ingredient. These products are transformed into metabolites and even into some other compounds through natural process which occurs in aquatic environment. Currently different technologies such as physical, chemical and biological or advance oxidation processes are used to treat the antibiotics. Some of these technologies are time consuming, ineffective and non-adequate for the emerging contaminants; furthermore few methods like AOPs (Advance Oxidation Processes) are innovative and efficient but they are expensive, need high energy and produced reactive or unstable oxidant which are not able to remove refractory contaminants. Therefore it needs an innovative green technologies which enable to decontaminate the water containing antibiotics. The electrochemical technologies offer an alternative way to treat these pollutants; the major process are electro-oxidation, electro-reduction, electrocoagulation, electro-Fenton, photoelectron-Fenton, sono-electrochemical, etc. The electrochemical technologies have some advantages over the other oxidation processes, like easily operation, high efficiency, coupling with other process, and low temperature required for its operation; moreover it can be powered with the help of solar panel to decrease the energy consumption. However still exist some challenges to overcome like designing and cost of electrode, improving the basic scientific understanding and in some cases the production of toxic intermediates. This study explores the electrochemical technologies and their application towards treatment of antibiotics.

7 citations

Journal ArticleDOI
TL;DR: In this paper, residual microstructures developed in polycrystalline iron after deformation at high rates of strain were characterized using transmission electron microscopy (TEM) using long, screw-type dislocations were observed in Hopkinson bar and impacted specimens compared to deformation twinning and dislocation cell structures found in shocked specimens.
Abstract: Residual microstructures developed in polycrystalline iron after deformation at high rates of strain were characterized using transmission electron microscopy (TEM). Long, screw- type dislocations were observed in Hopkinson bar and impacted specimens compared to deformation twinning and dislocation cell structures found in shocked specimens. Localized deformation bands were observed in the impacted specimen. No evidence for deformation twinning was found in the Hopkinson bar and impacted specimens. The effect of substructure produced in the specimens on the hardness of these specimens is also observed.

7 citations

Proceedings ArticleDOI
01 Aug 2018
TL;DR: In this article, a microstrip line fed ultra-wideband modified Wang shaped fractal patch (MWFP) antenna has been proposed and the parameters of the MWFP antenna such as operational bandwidth, efficiency, gain and radiation pattern have been examined numerically.
Abstract: In this work, a microstrip line fed ultra-wideband (UWB) modified Wang shaped fractal patch (MWFP) antenna has been proposed. The parameters of the MWFP antenna such as operational bandwidth, efficiency, gain, and radiation pattern have been examined numerically. Four bands, 14.8-16.3 GHz, 19.6-21.5 GHz, 32.65-36.1 GHz and 40–160 GHz, are achieved. The operational bandwidth of the fourth band is from 40–160 GHz (U, V, E, W, F & D bands) which shows the fractional bandwidth as 120%, stable gain around 9.81 dB, efficiency of 80% and VSWR less than 1.8. The examined characteristics show that the proposed antenna is a good candidate for the applications of millimetre-wave.

7 citations


Authors

Showing all 626 results

NameH-indexPapersCitations
Wajid Ali Khan128127279308
Shuichi Miyazaki6945518513
Muhammad Zubair5180610265
Mohammad Islam441929721
Asifullah Khan381925109
Muhammad Waqas323837336
Rana Abdul Shakoor301403244
Noor Muhammad291602656
Abdul Majid282313134
Muhammad Abid273773214
Iftikhar Ahmad261432500
Shaheen Fatima24792287
Ghulam Hussain241271937
Zubair Ahmad241451899
Muhammad Zahir Iqbal231291624
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20235
20229
2021180
2020154
2019100
201863