1,532 research outputs found
sj-docx-1-pie-10.1177_09544089211058093 - Supplemental material for MHD radiative flow of Williamson nanofluid along stretching sheet in a porous medium with convective boundary conditions
No full textSupplemental material, sj-docx-1-pie-10.1177_09544089211058093 for MHD radiative flow of Williamson nanofluid along stretching sheet in a porous medium with convective boundary conditions by Imran Ullah in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
Synthesis, characterisation and charge storage behaviour of some transition metal nitrides
No full textThe application of nanostructured materials with ordered morphologies and properties to electrochemical capacitors (ECs) is being studied in order to provide enhanced energy density without comprising their inherent high power density and excellent cyclability. In this study we have synthesised some metal nitrides through various routes using non-oxide precursor sources and studied their structure, composition and morphology. As synthesised materials were made in to electrodes and their capacitances were measured using cyclic voltammetry.Manganese nitrides were obtained in a solvothermal synthesis by reacting MnCl2 and LiNH2. Nanotubes at 350 °C or spherical shape particles were seen at higher temperatures. Capacitances were seen to drop with scan number when run for longer periods at higher scan rates. Molybdenum nitride samples were obtained by solution phase ammonolysis of MoCl5 or Mo(NMe2)4 to obtain the polymers. Annealing the choloroimide polymer yielded hexagonal MoN at 500 °C, rock salt Mo2N at 700 °C and above and a mix of both the phases at 600 °C. Imide derivatives yielded distorted cubic up to 800 °C and a mix of hexagonal and rock salt at high temperature. Nanotubes were obtained from imide derivatives up to 900 °C, while spherical particles above this temperature and for chloroimide derivatives at any temperature. CVs obtained for chloroimide derivatives show to double layer supercapacitors dominating over redox reaction, while imide derivatives were found to be redox in nature. Chloroimide samples show high capacities up to 247 F g-1 at 2 mV s-1 and long cycling lifetime for both the derivatives through 1000 cycles.Vanadium nitride samples were obtained by solution phase ammonolysis of V(NMe2)4. Annealing the polymer at various temperatures under NH3 produced VN with standard rock salt structure at 500-1000 °C while distorted rock salt in the samples obtained at lower temperature. Particles were found to be spherical in shape. Highest capacitance of 128 F g-1 was seen for the sample obtained at 600 °C at lower 2 mV s-1. Capacitance was found to be stable through 1000 scans only when a short potential window was used. TiN samples were produced by obtaining a precursor from solution phase ammonolysis of Ti(NMe2)4 and annealing the precursor under ammonia or through sol-gel route using long chain amines as the templating agents. PXD patterns showed rock salt TiN with broad peaks at 500 °C or highly crystalline at 800 °C. TEM images suggested particles to be spherical in shape. A fairly high surface area of 319 m2 g-1 was observed for the sample obtained from annealing the HDA/PrNH2 polymer at 500 °C. Cyclic voltammograms showed poor charge storage and most of the samples tend to oxidise rapidly in aqueous KOH. VN/C samples were obtained carrying an overnight reaction of V(NMe2)4 with NH3 in a hydrothermal bomb at various temperature. PXD reviled rock salt VN, some distortion was in the structure was found in the sample obtained at lower temperature. TEM images show vanadium nitride nano particles with carbon nanotubes. Specific capacitances were observed to be decreased with scan number through 100 cycles in 1 M KOH
Synthesis of transition metal nitrides and silicon based ternary nitrides
No full textSolution phase ammonolysis and sol-gel techniques that produce polymeric metal-amide precursors are of growing interest in the synthesis of nitride materials, which result from the thermal decomposition of the polymer. They can be used to control composition and to produce a large number of useful morphologies such as nanoparticles, films, monoliths, aerogels, and materials with large surface area such as foams. The synthesis of nitride materials using ammonolysis of metal amides and chlorides has so far largely focused on producing powders for applications such as catalysis, or thin films by chemical vapour deposition and related techniques.In this thesis, formation of tantalum and molybdenum nitride nanoparticles and metal-silicon nitride based nanocomposites have been synthesised using non-oxide precursors by solution phase ammonolysis and sol-gel methods respectively. For tantalum nitride nanoparticles Ta(NMe2)5 in THF was ammonolysed with ammonia at - 78 °C and the polymeric precursor was pyrolysed at various temperatures under ammonia. Amorphous TaN was obtained at 700 °C and below, while Ta3N5 was obtained at 800 °C under ammonia and also by re-annealing the amorphous samples at 800 °C under nitrogen. Molybdenum nitride powders were obtained by solution phase ammonolysis of MoCl5 or Mo(NMe2)4 and further annealing the polymeric precursors on different temperatures. The chloride precursor resulted in hexagonal MoNx at 500 °C, or rock salt MoNx at 700-1000 °C and mixture of both at 600 °C. The amide precursor resulted phase pure hexagonal MoNx at 600 °C and rock salt mixed with hexagonal at 1000 °C. Samples produced at 600 °C consisted mainly of nanotubes. Some decomposition to molybdenum metal was found in MoN obtained at 1000 °C from either precursor source.Co-ammonolysis of Ta(NMe2)5 or Mo(NMe2)4 with Si(NHMe)4 was carried out using sol-gel technique. Polymeric metal-silicon amide precursors were annealed at 600 or 1000 °C. The Ta/Si precursor produced amorphous nanocomposites and no phase segregation was observed even after high temperature annealing. With molybdenum the products were nanocomposites of molybdenum nitride particles, including nanotubes, supported on a silicon nitride amorphous matrix
sj-docx-1-pie-10.1177_09544089221131147 - Supplemental material for Thermal scrutinization of magetohydrodynamics CuO engine oil nanofluid flow across a horizontal surface via Koo–Kleinstreuer–Li modeling: A thermal case study
No full textSupplemental material, sj-docx-1-pie-10.1177_09544089221131147 for Thermal scrutinization of magetohydrodynamics CuO engine oil nanofluid flow across a horizontal surface via Koo–Kleinstreuer–Li modeling: A thermal case study by Syed M Hussain, Faisal Shahzad, Wasim Jamshed, Mohammad Kalimuddin Ahmad, Zulfiqar Rehman and Imran Ullah in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
Regularity of Language Used by Imran Khan and Maryam Nawaz in their Tweets
No full textThe aim of the present study is to examine the regularity of language used by Imran Khan and Maryam Nawaz in their tweets. The main objectives of this research are to find out the similarities and differences, different styles and regularity of language used by Imran Khan and Maryam Nawaz in their tweets. The researchers used both qualitative and quantitative research methods for this research. The data were collected from the Twitter accounts of Imran Khan and Maryam Nawaz. The data were collected orderly from January to September, 2022. A single tweet from each account was collected from these months for data analysis. The work of Miles and Huberman (1994) was used as a framework for analyzing the data. The results showed that there were similarities and differences in the language used by Imran Khan and Maryam Nawaz. Both used informal language, but Maryam Nawaz used it less than Imran Khan. The study also revealed the different patterns and regularities of formal and informal language used by Imran Khan and Maryam Nawaz
The Relentless and logjam Success of Imran Khan and Challenges for Naya Pakistan
No full textA study about Imran Khan (Current Prime minister of Pakistan) and his true struggle toward Naya Pakistan & encountered a bit of challenge out of many
Brick Kilns Air Pollution and its Impact on the Peshawar City
No full textIn recent times, the brick kiln contributes to air pollution is one of the most emerging issues worldwide. In this research work, the Peshawar city, ambient air quality was measured, using a fixed air monitoring station to evaluate the impact of gaseous emission from brick kilns on ground level. In this study, the portable gas analyzer (PG-250) was used to quantify brick-based emitting carbon monoxide (CO), sulfur dioxide (SO2) and nitrogen oxide (NOx) from 3 brick kilns in the city of Peshawar. It was noticed that the average concentration of SO2 and NOx exceeds the National Environmental Quality Standards (NEQS) of Pakistan specifically, in terms of air quality. The brick kilns in District Peshawar have shown negative effects on the environment. It is necessary to take various measures to monitor the brick kiln embosom regularly before it becomes a significant risk for individuals. In conclusion, the impact of air pollution on physical activity and sedentary behavior at a specific time may be different
Finite sample econometrics / Aman Ullah.
No full texteconomic&political bookfair2015Includes bibliographical references (p. 199-225) and index.x, 230 pages
Supplementary_figure - CD105<sup>+</sup> Porcine Endometrial Stromal Mesenchymal Stem Cells Possess Differentiation Potential Toward Cardiomyocyte-Like Cells and Insulin-Producing β Cell-Like Cells In Vitro
No full textSupplementary_figure for CD105+ Porcine Endometrial Stromal Mesenchymal Stem Cells Possess Differentiation Potential Toward Cardiomyocyte-Like Cells and Insulin-Producing β Cell-Like Cells In Vitro by Raghavendra Baregundi Subbarao, Sharath Belame Shivakumar, Yong-Ho Choe, Young-Bum Son, Hyeon-Jeong Lee, Imran Ullah, Si-Jung Jang, Sun-A Ock, Sung-Lim Lee, and Gyu-Jin Rho in Reproductive Sciences</p
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