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Search Results: 1 - 10 of 835 matches for " Athar Adil Hashmi "
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Preparation Physicochemical Characterization and Catalytic Applications of Polystyrene Ethylenediamine Tetra acetic Acid Cu(II) Metal Complex  [PDF]
Imtiyaz Rasool Parrey, Syed Anayutullah, Athar Adil Hashmi
Modern Research in Catalysis (MRC) , 2014, DOI: 10.4236/mrc.2014.34014
Abstract: Chloromethylated styrene-divinylbenzene copolymer beads with 8% crosslink were chemically modified by reaction with Ethylenediaminetetraaceticacid leading to the incorporation of nitrogen as ligating site on the surface of the polymer. The polymeric ligand on treatment with a solution of Copper chloride gave the corresponding metal complex. The polymer supported Cu(II) complex was characterized by elemental analyses, IR,GC-MS, scanning electron micrographs (SEM). The oxidation of various alcohols such as benzyl alcohol, 2-butanol, and 2-propanol was investigated using the supported metal complexes in presence of molecular oxygen as the oxidant. The swelling studies were done by using different solvents. Kinetic data indicate that the catalysts could be recycled without significant degradation of polymer matrix.
Silver Nanoparticles: Green Route, Stability and Effect of Additives  [PDF]
Zaheer Khan, Javed Ijaz Hussain, Sunil Kumar, Athar Adil Hashmi, Maqsood Ahmad Malik
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2011, DOI: 10.4236/jbnb.2011.24048
Abstract: Colloidal silver nanoparticles were prepared by reducing silver nitrate with oxalic acid in presence of cetyltrimethylammonium bromide (CTAB). The synthesized silver particles show an intense surface plasmon band in the visible region. The work reported in this paper describes the effect of concentration of various additives (NaCl, NaBr, NaNO3, Na2SO4 and NaH2PO4) and ammonia on the growth and stability of Ag-nanoparticles. In all the cases the rate decreases as the [electrolytes] or [ammonia] increases. The nature, polarizability and coordinating ability of the anions play vital roles for nucleus formation and the growth process, which subsequently form different size particles. Transmission electron microscopy, selected areas electron diffraction, and UV-visible spectroscopy have been employed to characterize Ag-nanoparticles. The effect of the following variables on the particle size and size distribution was investigated: the [oxalic acid], [CTAB] and [Ag+].The nanoparticles are stable in NaNO3 and NaH2PO4 solutions; but NaCl, NaBr and Na2SO4 causes their aggregation.
Wet Synthesis of Monodisperse Cobalt Oxide Nanoparticles
Taimur Athar,Abdul Hakeem,Neha Topnani,Ameed Hashmi
ISRN Materials Science , 2012, DOI: 10.5402/2012/691032
Abstract:
Wet Synthesis of Monodisperse Cobalt Oxide Nanoparticles
Taimur Athar,Abdul Hakeem,Neha Topnani,Ameed Hashmi
ISRN Materials Science , 2012, DOI: 10.5402/2012/691032
Abstract: Ultrafine and monodispersable colloidal cobalt oxide nanoparticles were successfully synthesized quantitatively via soft chemical approach with controlled particle size and microstructural properties for their use in technological applications. The particle size, shape, and other microstructural properties are directly influenced by their reaction conditions. The FT-IR studies give information for phase purity, and ultraviolet absorption spectroscopy helps to study the optical properties. Thermal analysis gives the information about thermal stability. With the help of X-ray diffraction pattern, the size of the particle was calculated. An electron microscope studies help in morphological characterization, and Brunauer-Emmett-Teller method gives information about surface area. Cobalt oxide nanoparticle tends to orient itself with its narrow size distribution having a crystal size around 50?nm. 1. Introduction In recent years, synthesis of transition metal oxide nanoparticles has attracted much attention because of their outstanding multifunctional physical-chemical properties for their use in different fields. The actual challenge that depends on how to optimize a cost-effective synthetic methodology via soft chemical approach that gives technological grade nanomaterials with a specific structural-morphological functional properties remains a challenge to synthetic chemists. Cobalt oxide nanopowder is widely used in many fields such as magnetic [1], gas sensor [2], lithium ion batteries [3], catalysis [4], and electrochemical [5] depending on the size, structure, shape, and phase homogeneity and with surface morphologies. Many approaches were made for the successful synthesis of cobalt oxide nanoparticles in past one decade by using different synthetic approaches, such as thermal method [6], precipitation methods [7], pyrolysis process [8], and sonochemical method [9]. However, all these methods have a limited control in particle functional properties with low yield. Therefore, it is necessary to find alternative method for the synthesis of nanopowder that should be cost-effective and environmental friendly. The soft chemical approach is the best synthetic method which helps to synthesize of cobalt oxide nanopowder. Soft chemistry that helps to increase a functional efficiency for its use in technology also helps in better understanding the crystal growth with a required shape, size, and phase purity by controlling surface energies. We have used wet chemical approach to prepare ultrapure monodisperse tetrapod-shaped cobalt oxide nanoparticles with a
From Grid Middleware to a Grid Operating System
Arshad Ali,Richard McClatchey,Ashiq Anjum,Irfan Habib,Kamran Soomro,Mohammed Asif,Ali Adil,Athar Mohsin
Computer Science , 2006,
Abstract: Grid computing has made substantial advances during the last decade. Grid middleware such as Globus has contributed greatly in making this possible. There are, however, significant barriers to the adoption of Grid computing in other fields, most notably day-to-day user computing environments. We will demonstrate in this paper that this is primarily due to the limitations of the existing Grid middleware which does not take into account the needs of everyday scientific and business users. In this paper we will formally advocate a Grid Operating System and propose an architecture to migrate Grid computing into a Grid operating system which we believe would help remove most of the technical barriers to the adoption of Grid computing and make it relevant to the day-to-day user. We believe this proposed transition to a Grid operating system will drive more pervasive Grid computing research and application development and deployment in future.
Studying the Utilization of Plastic Waste by Chemical Recycling Method  [PDF]
Adil Ko?
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.37051
Abstract:

The rapid increase in the use of plastic materials in the recent years led to the accumulation of excessive amounts of plastic waste. The so-called thermoplastics such as PE, PP, PS, PVC and PET as well as materials that are derived from these are the type of plastic that is most used and consequently creates most of the waste. In this study, the original and waste forms of PE and PP plastic types have been chosen for thermal and catalytic degradation. As process parameter, 410oC - 450oC temperature interval and 600 mL/min constant flow rate nitrogen gas have been chosen as the carrier gas and the reaction time was considered to be 90 minutes for all experiments. Liquid products collected in experiments were separated by means of fractioned distillation process. For purposes of determining product distribution, the fractions, which were separated by distillation, were diluted in an appropriate solution for analysis of GC/MS. In the study conducted, it has been observed that the liquid product distribution obtained mainly consists of a mixture of saturated and unsaturated (heptane, heptane, octane, nonane, dodecane, etc.) hydrocarbons.

Hydrothermally Synthesized NanobioMOFs, Evaluated by Photocatalytic Hydrogen Generation  [PDF]
Tabinda Sattar, Muhammad Athar
Modern Research in Catalysis (MRC) , 2017, DOI: 10.4236/mrc.2017.62007
Abstract: Three new materials, nanobioMOFs (cobalt argeninate, cobalt asparaginate and cobalt glutaminate) have been hydrothermally synthesized. Nano sized morphology of all these materials have been obtained by scanning electron microscopic technique. Mass spectrometric studies of all these materials have been conducted for determination of their molar masses. All these nanobioMOFs have been found to exhibit photocatalytic hydrogen generation in pure water upon irradiation at wavelengths longer than 650 nm. The amounts of quantum yield of hydrogen generation at 650 nm in water was 4.5%, 4.0% and 3.5% for cobalt argeninate, cobalt asparaginate and cobalt glutaminate respectively. The apparently higher yield of hydrogen generation from these amine functionalized nanobioMOFs can direct to the development of more nano sized functionalized MOFs for water splitting.
Acquired Complete Heart Block with Long QT Interval and Recurrent Polymorphic Ventricular Tachycardia: A Case Report  [PDF]
Hosam Zaky, Jassem Al Hashmi
Open Journal of Internal Medicine (OJIM) , 2016, DOI: 10.4236/ojim.2016.62008
Abstract: We are reporting a case of acquired complete heart block and long QT interval (a dispersion of repolarization that leads to polymorphic ventricular tachycardia) that has presented with loss of conscious and proved to be due to torsade de pointes. The patient responded well to cardiac pacing and beta blocker therapy. The association of complete acquired heart block and long QT interval is quite rare.
DIABETES MELLITUS
Riwan Hashmi
The Professional Medical Journal , 1998,
Abstract: Diabetic nephropathy is a common microvascular complication of diabetes mellitus and reflects serious renaldisease specific to diabetes. It is one of the common causes of end stage renal disease. A cross sectionalstudy was carried out to find the incidence of proteinuria, microalbuminuria and transferrinuria in knowdiabetics of Rawalpindi. One hundred and forty six consecutive diabetics were included in the study (68 menand 78 women) for detection of diabetic nephropathy. Thirty age and sec matched, healthy controls were alsoincluded in the study. Urine protein, microalbumin and transferrin concentration were analysed in the 24hours urine samples submitted by all diabetics and healthy controls. The screening of protein in urine wasdone by dipstick method using Uristix Ames (UK). Quantitative urine total protein was estimated by Biuretmethod; the dipstick negative samples were analysed for microalbuminuria by using Pyrogallol-molybdatetest technique and urinary transferrin was estimated by immunoturbidimetry method. The transferrinexcretion in diabetic subjects significantly (P<0.01) exceeded that in healthy subject. The 65% of diabeticshad an abnormally high urinary transferrin excretion and 40% had high urinary protein excretion(proteinuria: 14%: microalbuminuria: 26%). It is concluded that microalbuminuria proteinuria andtransferrinuria is common in our diabetics reflecting poor metabolic control.
Professional Learning Community: A Study of Teachers’ Perceptions in Pakistan
Kiran Hashmi
International Journal of Social Sciences and Education , 2011,
Abstract: The study highlights the perception of teachers on Professional Learning Community. Professional Learning Community (PLC) focuses on learning rather teaching, collaborative work and holding teachers accountable for results. PLC ensures that students learn, teachers create a culture of collaboration and the focus is on results. For this, quantitative research approach was used. A standardized questionnaire on Professional Learning Community designed by Huffman was selected for data collection. The questionnaire has five sections based on the five major dimensions of PLC which are shared and supportive leadership, shared values and vision, collective learning and application of learning, shared personal practice and supportive conditions (collegial relationships and structures). A total of 100 teachers were taken as sample after pilot testing. Five hypotheses were constructed on the five dimensions of PLC and were tested through regression analysis. The results show that the teachers although having a collaborative environment are unaware of the Professional Learning Community. They are reluctant in accepting the feedback from their staff and colleagues. They preferred to work in isolation rather having a shared knowledge. Assessments are for learning; however, teachers accepted that learning is restricted to marks only. When putting into practice, PLC can be seen as a positive experience for all stake holders.
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