Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2017 ( 3 )

2016 ( 4 )

2015 ( 10 )

2014 ( 14 )

Custom range...

Search Results: 1 - 10 of 168 matches for " Zahoor   "
All listed articles are free for downloading (OA Articles)
Page 1 /168
Display every page Item
Removal of Pesticides from Water Using Granular Activated Carbon and Ultrafiltration Membrane—A Pilot Plant Study  [PDF]
Muhammad Zahoor
Journal of Encapsulation and Adsorption Sciences (JEAS) , 2013, DOI: 10.4236/jeas.2013.33009

The use of powdered activated carbon for fouling control in the membrane processes is limited by some secondary problems associated with its use, like cake formation, long backwash times and blackening of pipes. Granular activated carbon (GAC) was used as an alternative of powdered activated carbon due to its large particle size which was kept from being entering into the membrane system. The secondary problems associated with the use of powdered activated carbon as foul control were not observed for granular activated carbon. Langmuir and Freundlich adsorption were used to describe the adsorption of 2,4-D and paraquat on GAC. Adsorption capacity of adsorbent was high for 2,4-D as compared to paraquat. Also, the R2 value was high for Langmuir model as compared to Freundlich model. Retention percentage of 2,4-D by membrane was high and thus the decline in permeate flux was high as compared to paraquat in ultrafiltration (UF) membrane process. 100% retention of 2,4-D was achieved in GAC/UF hybrid system. Improved permeate fluxes were observed for both contaminants in the hybrid system.

AZR-LEACH: An Energy Efficient Routing Protocol for Wireless Sensor Networks  [PDF]
Zahoor A. Khan, Srinivas Sampalli
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2012, DOI: 10.4236/ijcns.2012.511082
Abstract: Reducing the energy consumption of available resources is still a problem to be solved in Wireless Sensor Networks (WSNs). Many types of existing routing protocols are developed to save power consumption. In these protocols, cluster-based routing protocols are found to be more energy efficient. A cluster head is selected to aggregate the data received from root nodes and forwards these data to the base station in cluster-based routing. The selection of cluster heads should be efficient to save energy. In our proposed protocol, we use static clustering for the efficient selection of cluster heads. The proposed routing protocol works efficiently in large as well as small areas. For an optimal number of cluster head selection we divide a large sensor field into rectangular clusters. Then these rectangular clusters are further grouped into zones for efficient communication between cluster heads and a base station. We perform MATLAB simulations to observe the network stability, throughput, energy consumption, network lifetime and the number of cluster heads. Our proposed routing protocol outperforms in large areas in comparison with the LEACH, MH-LEACH, and SEP routing protocols.
The Professional Medical Journal , 2005,
Abstract: Objectives: To document the common microorganisms causing UTI in humanand their resistance to currently used antibiotics. Data Source: PMRC, Research Center Khyber Medical CollegePeshawar Design: Retrospective analytical study. Period: Jan 2000 to June 2003. Material and Methods: Evaluationresults of 597 urine cultures performed during the period, on clinically suspected referred subjects. Results: Bacterialgrowth was obtained in 35% samples. Common micro organisms in decreasing order of yield are E. Coli, Klebsiella,Staph aureus, Proteus species and pseudomonas isolated from 80, 7.1, 5. & 1.5% samples respectively. 100%sensitivity is observed for imipenum. Efficacy next in decreasing order was for Amikacin, Tarivid, Ciproxin andRocephin. Conclusion: Esch. Coli is the predominant etiological organism of UTI and imipenum is the drug of choiceto which over 80% of all the different organisms are sensitive. Recommendation: Constantly changing sensitivitypattern of the organisms responsible for UTI demands a periodic check for better selection of drug and reduction ofconsequences of the disease.
Block Layering Approach in TAST Codes  [PDF]
Zahoor Ahmed, Jean Pierre Cances, Vahid Meghdadi
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2010, DOI: 10.4236/ijcns.2010.310105
Abstract: Threaded Algebraic Space Time (TAST) codes developed by Gamal et al. is a powerful class of space time codes in which different layers are combined and separated by appropriate Diophantine number . In this paper we introduce a technique of block layering in TAST codes, in which a series of layers (we call it Block layers) has more than one transmit antenna at the same time instant. As a result we use fewer layers (Diophantine numbers) for the four transmit antennas scheme, which enhances the coding gain of our proposed scheme. In each block layer we incorporate Alamouti’s transmit diversity scheme which decreases the decoding complexity. The proposed code achieves a normalized rate of 2 symbol/s. Simulation result shows that this type of codes outperforms TAST codes in certain scenarios.
Periodic variation in soil, forage and serum minerals of dry cattle in Punjab, Pakistan  [PDF]
Zafar Iqbal Khan, Ameer Fawad Zahoor
Agricultural Sciences (AS) , 2013, DOI: 10.4236/as.2013.42009
Abstract: An investigation was conducted to evaluate the nutrient level of grazing livestock as influenced by the sampling periods in Punjab state districtSargodha,Pakistan. Twenty composite soil and pasture and twenty five blood samples were collected at two different sampling periods during December 2010 to March, 2011, respectively. Higher soil content of all elements except iron was observed during December than those found in Mach at the 2nd harvest during this period but all mean values were above the critical levels investigated for soil for the requirements of forage crops. Forage, potassium, magnesium and copper levels did not differ between samplings. Calcium, sodium, zinc, manganese, cobalt and selenium were higher during December, while reverse was true for forage iron reflecting the soil iron contents. The sodium, manganese, iron and selenium in forage were found to be deficient than the requirements of livestock during both sampling times in this investigation. From the four minerals assessed in the serum calcium, magnesium and zinc levels were high after the December in March. The macro mineral which were found to be moderately deficient at this animal farm are sodium and magnesium. Micro elements most likely to limit livestock production efficiency are copper, zinc, manganese and cobalt. Specific mineral supplementation should be supplied containing copper and zinc, as both pasture and blood plasma samples exhibited their deficiency. The present investigation suggests the requirement and provision of an appropriate specificity tailored mineral mixture to ruminants in this specific studied area. The objective of this study was to determine deficiency or excess of various minerals to have the knowledge of the status of different minerl elements for supplementation if necessary.
Low-Noise Amplification, Detection and Spectroscopy of Ultra-Cold Systems in RF Cavities  [PDF]
Masroor H. S. Bukhari, Zahoor H. Shah
Modern Instrumentation (MI) , 2016, DOI: 10.4236/mi.2016.52002
Abstract: The design and development of a cryogenic Ultra-Low-Noise Signal Amplification (ULNA) and detection system for spectroscopy of ultra-cold systems are reported here for the operation in the 0.5 - 4 GHz spectrum of frequencies (the “L” and “S” microwave bands). The design is suitable for weak RF signal detection and spectroscopy from ultra-cold systems confined in cryogenic RF cavities, as entailed in a number of physics, physical chemistry and analytical chemistry applications, such as NMR/NQR/EPR and microwave spectroscopy, Paul traps, Bose-Einstein Condensates (BEC’s) and cavity Quantum Electrodynamics (cQED). Using a generic Low-Noise Amplifier (LNA) architecture for a GaAs enhancement mode High-Electron Mobility FET device, our design has especially been devised for scientific applications where ultra-low-noise amplification systems are sought to amplify and detect weak RF signals under various conditions and environments, including cryogenic temperatures, with the least possible noise susceptibility. The amplifier offers a 16 dB gain and a 0.8 dB noise figure at 2.5 GHz, while operating at room temperature, which can improve significantly at low temperatures. Both dc and RF outputs are provided by the amplifier to integrate it in a closed-loop or continuous-wave spectroscopy system or connect it to a variety of instruments, a factor which is lacking in commercial LNA devices. Following the amplification stage, the RF signal detection is carried out with the help of a post-amplifier and detection system based upon a set of Zero-Bias Schottky Barrier Diodes (ZBD’s) and a high-precision ultra-low noise jFET operational amplifier. The scheme offers unique benefits of sensitive detection and very-low noise amplification for measuring extremely weak on-resonance signals with substantial low- noise response and excellent stability while eliminating complicated and expensive heterodyne schemes. The LNA stage is fully capable to be a part of low-temperature experiments while being operated in cryogenic conditions down to about 500 mK.
The Effect of Task Based Language Teaching on Writing Skills of EFL Learners in Malaysia  [PDF]
Rai Zahoor Ahmed, Siti Jamilah Bt Bidin
Open Journal of Modern Linguistics (OJML) , 2016, DOI: 10.4236/ojml.2016.63022
Abstract: This quasi experimental study has validated the effectiveness of Task Based Language Teaching (TBLT) in promoting writing skills of EFL learners enrolled in undergraduate programs at public sector Malaysian universities. TBLT is emerging as an essential part of curricula in language pedagogies in several countries around the globe and advocated by prominent SLA researchers along with ELT practitioners. In current study research participants were divided into an experimental and a control group. The data were collected following a Mixed Method Research paradigm during pretest and posttest. A Paired Samples T-test was used to determine the statistical significance of the learners’ scores in pretest as compared to the posttest. The vast majority of the learners opined in their reflective journal that TBLT was the most interesting and a learner centered approach enabling learners to use their existing linguistic resources. The use of existing linguistic resources is a fundamental principle of TBLT as it leads the EFL learners to be fluent and confident users of English language both inside and outside the classroom in real life situations.
The Professional Medical Journal , 2004,
Abstract: Objective: To evaluate biochemically the water pollutionby estimating various quality parameters of ground water supply available in the southern area ofFaisalabad. Design: Prospective study Setting: Biochemistry Department Punjab Medical CollegeFaisalabad and Soil Research laboratory of AARI Jhang Road Faisalabad. Duration: May 2000 toSeptember 2000 Material & Methods: Different parameters were divided into three different categoriesi.e. Highly-desirable(HD), Maximum-permissible(MP) and In-Tolerant(IT) limit groups. Results: TotalHardness(HD) showed 35% in HD, 40% in MP and 25% in IT limits. Similarly Total Dissolved Solids(TDS) were 23% in HD, 52% in MP and 25% in IT range The Ca was 30%in HD, 50% in MP and 20%in IT limits. The Mg showed 50% in HD, 38% in MP and 12% in IT range. Similarly Cl was, 45% in HD,32% in MP and 23% in IT range. Lastly SO4 percentage showed 45% in HD, 37.5% in MP and only17.5% in IT limit. Conclusions: The result showed that people living in Bawaywala area were consuminghighly polluted water and similarly the peoples of other colonies are using more or less the same typeof water.
Zahoor Ullah et al
International Journal of Pharmaceutical Sciences and Research , 2012,
Abstract: Vitex negundo Linn. belong to family Verbenaceae. It is an important medicinal plant. Literature survey of V. negundo revealed the presence of different classes of natural products including essential oil, triterpenes, diterpenes, sesquiterpenes, lignan, flavonoids, flavones glycosides, iridoid glycosides, and stilbene derivative. The plant is traditionally reported for its use for the treatment of cough, asthma, fever, eye disease, inflammation, intestinal worms, skin diseases, nervous disorders, leprosy and rheumatism. Roots are tonic, anodyne, febrifuge, bechic, expectorant and diuretic. This review is short review of last two years reporting the natural products isolated and biological potential of Vitex negundo Linn.
Predicting Level of Development for Different Countries
Zahoor Ahmad,Aysha Saleem
Journal of Sustainable Development , 2012, DOI: 10.5539/jsd.v5n11p15
Abstract: It is well evidenced that development is a crucial aspect of any country. The demand of a country to be developed, it is necessary to concentrate on other aspects of economy like social and political development rather than just economic growth. In this paper our basic objective is to develop the model to predict the country’s development level on the bases of some social, economic and political indicators and also investigate the role of these indicators on development of a country. These indicators are primarily related to economic, health, education and governance. The development of a country is considered as categorical variable, the categories are already defined by United Nations Development Program (UNDP). These categories (highly developed, developed, developing and under developed) are based on Human Development Index (HDI). The data for this study is obtained for 186 countries from World Bank (WB) and UNDP for the year of 2010. Multilayer Perceptron (MLP) Neural Network Model is used for predicting the country’s level of development on the basis of economic, health, education and governance indicators, and the relative importance of these indicators in prediction. Our results show that the indicators; health, education and governance have greater effect on countries development level as compare to the economic indicators. From this investigation, it is suggested that developing and under developed countries should also concentrate on the health, education and governance to improve their development level rather than only increasing the economic indicators.
Page 1 /168
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.