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Search Results: 1 - 10 of 1163 matches for " Naveed Akhtar "
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Spectrochemical Investigation of Aluminum Master Alloys
Naveed Akhtar
Pakistan Journal of Analytical and Environmental Chemistry , 2010,
Abstract: The objective of this study is to observe the significance of sampling fractions in spectrochemical analysis of aluminium master alloys. Aluminium master alloys are difficult to analyze by routine analytical methods due to inhomogeneity and high percentage of the alloying elements. In this study aluminium master alloys were remelted along with aluminium ingots of 99.9% purity in an electrical crucible furnace and subsequently analysis by spark optical emission spectrometer (OES). The bulk samples of a particular aluminium master alloy for re-melting process was chosen by two different methods and evaluated for % recovery of the target element. It was observed that sampling fractions and compilation techniques greatly affects the compositional results of aluminium master alloys. The 20% bulk sampling showed good recoveries and very precise results for each alloying element in the respective master alloy. The results of spark OES were cross checked by X-ray fluorescence spectrometer (XRF) with the help of certified reference materials.
The Professional Medical Journal , 2006,
Abstract: Objective: To determine the diagnostic yield of microscopy of endobronchialsecretions collected by bronchoscopy in patients who were suspected to have pulmonary TB but their sputum smearwas negative for AFB with ZN staining. Study Design: Descriptive study. Place and Duration of Study: At MilitaryHospital Rawalpindi from June 2004 to May 2005. Subjects and Methods: Fifty patients were included in the study.Convenience sampling technique of non-probability sampling procedure was used for the selection of patients. Onlythose patients suspected to have pulmonary TB on clinical grounds, raised ESR and X-rays chest showing pulmonaryinfiltrates but sputum smear negative for AFB on a minimum of three examinations were included in the study.Bronchoscopy of these patients was done, endobronchial secretions taken and sent for microscopy for AFB. Results:Out of 50 patients, 16(32%) patients were positive for AFB while 34(68%) were negative on endobronchial secretion’smicroscopy. Conclusion: Microscopy of endobronchial secretions collected by bronchoscopy is a useful technique inthe diagnosis of pulmonary TB in patients who are suspected to have pulmonary TB but their sputum smear is negativefor AFB with ZN staining.
Pakistan Journal of Botany , 2008,
Abstract: Pollen morphology of four species and three cultivars belonging to genus Hibiscus of family Malvaceae from North West Frontier Province (N.W.F.P.) of Pakistan were examined by light and scanning electron microscope. Pollen morphology of the family is fairly uniform. Pollen grains are generally radially symmetrical apolar, mostly spheroidal to oblate-spheroidal, pantoporate or polyporate. Tectum uniformly echinate, medium to finely perforated, or punctate with granules or scabrae in between spines.
Risk Management Practices and Islamic Banks: An Empirical Investigation from Pakistan
Naveed Ahmed,Muhammad Farhan Akhtar,Muhammad Usman
Interdisciplinary Journal of Research in Business , 2011,
Abstract: This study aims to determine the firm’s level factors which have significantly influence the risk management practices of Islamic banks in Pakistan. For this purpose, the current study selects credit, operational and liquidity risks as dependent variables while size, leverage, N PLs ratio, capital adequacy and asset management are utilize as explanatory variable for the period of four years from 2006 to 2009. The results indicate that size of Islamic banks have a positive and statistically significant relationship with financial risks (credit and liquidity risk), whereas its relation with operational risk is found to be negative and insignificant. The asset management establishes a positive and significant relationship with liquidity and operational risk. The debt equity ratio and N PLs ratio have a negative and significant relationship with liquidity and operational risk. In addition, capital adequacy has negative and significant relationship with credit and operational risk, whereas it is found to be positive and with liquidity risk.
Biowaiver study of oral tabletted ethylcellulose microcapsules of a BCS class I drug
Ghulam Murtaza,Mahmood Ahmad,Naveed Akhtar
Bulletin of the Chemical Society of Ethiopia , 2009,
Abstract: This article describes the preparation and characterization (in vitro and in vivo) of three different sustained-release salbutamol sulfate ethylcellulose tabletted microparticles (T1, T2 and T3) and reference sustained release tablet (Ventolin 8 mg SR, GSK). In vitro characterization included dissolution study, scanning electron microscopy, UV and FTIR spectroscopy, X ray diffractometry and thermal analysis. A validated HPLC fluorescent detection method was adopted to conduct bioavailability studies in young healthy human volunteers. The microparticles exhibited an irregular and slightly aggregated morphology with fine rheological properties. No strong chemical interaction was found between drug and polymer. A good linear correlation (R2 = 0.9224, 0.945, 0.9363 and 0.9694 for T1, T2, T3 and reference formulations, respectively) was obtained between the percent cumulative drug released (in vitro) and the percent cumulative drug absorbed (in vivo) data of these formulations at specific time points to develop level A in vitro in vivo correlation. However, T2 was found closer to the reference formulation that shows a reliable prediction of the plasma concentrations obtained following a single dose of salbutamol sulfate modified release formulations.
Sparseness helps: Sparsity Augmented Collaborative Representation for Classification
Naveed Akhtar,Faisal Shafait,Ajmal Mian
Computer Science , 2015,
Abstract: Many classification approaches first represent a test sample using the training samples of all the classes. This collaborative representation is then used to label the test sample. It was a common belief that sparseness of the representation is the key to success for this classification scheme. However, more recently, it has been claimed that it is the collaboration and not the sparseness that makes the scheme effective. This claim is attractive as it allows to relinquish the computationally expensive sparsity constraint over the representation. In this paper, we first extend the analysis supporting this claim and then show that sparseness explicitly contributes to improved classification, hence it should not be completely ignored for computational gains. Inspired by this result, we augment a dense collaborative representation with a sparse representation and propose an efficient classification method that capitalizes on the resulting representation. The augmented representation and the classification method work together meticulously to achieve higher accuracy and lower computational time compared to state-of-the-art collaborative representation based classification approaches. Experiments on benchmark face, object and action databases show the efficacy of our approach.
Discriminative Bayesian Dictionary Learning for Classification
Naveed Akhtar,Faisal Shafait,Ajmal Mian
Computer Science , 2015,
Abstract: We propose a Bayesian approach to learn discriminative dictionaries for sparse representation of data. The proposed approach infers probability distributions over the atoms of a discriminative dictionary using a Beta Process. It also computes sets of Bernoulli distributions that associate class labels to the learned dictionary atoms. This association signifies the selection probabilities of the dictionary atoms in the expansion of class-specific data. Furthermore, the non-parametric character of the proposed approach allows it to infer the correct size of the dictionary. We exploit the aforementioned Bernoulli distributions in separately learning a linear classifier. The classifier uses the same hierarchical Bayesian model as the dictionary, which we present along the analytical inference solution for Gibbs sampling. For classification, a test instance is first sparsely encoded over the learned dictionary and the codes are fed to the classifier. We performed experiments for face and action recognition; and object and scene-category classification using five public datasets and compared the results with state-of-the-art discriminative sparse representation approaches. Experiments show that the proposed Bayesian approach consistently outperforms the existing approaches.
Intercropping Maize with Cowpeas and Mungbean under Rainfed Conditions
Naveed Akhtar,Mirza Hassan,Akhtar Ali,Muhammad Riaz
Pakistan Journal of Biological Sciences , 2000,
Abstract: The research study was conducted at two locations i.e. Barani Agricultural Research station (Kohat) and Barani Seed Farm (Hangu) to ascertain the biological efficient and economic efficient intercropping system of maize with cowpeas and mungbean. The studies consisted of five intercropping systems (maize sole, cowpeas sole, mungbean sole, maize + cowpeas and maize + mungbean). The results regarding LER showed that maize + cowpeas intercrop average of two locations was 1.29 indicating 29 percent yield advantage which is also biological efficient system. The maize + mungbean indicating 4 percent yield advantage. However, the economic analysis gave a different results which showed that mungbean sole crop gain highest BCR value (return per rupee invested i.e. Rs. 4.82) followed by cowpeas sole crop (Rs. 4.13). It is concluded that apart from biological efficient different economic indices should be computed for comparison and final recommendation for wide spread adoption.
Effect Of Planting Geometry And Weed Control Methods On Yield Components Of Wheat
Akhtar Ali,Mirza Hassan,Naveed Akhtar,Javed Iqbal
Pakistan Journal of Biological Sciences , 2000,
Abstract: The three row geometries were wheat planted in 30 cm apart row, 45 cm apart row and 30 cm apart rows with 3rd row skip. The eight weed control treatments were hand hoeing, mechanical hoeing, mechanical hoeing twice, Dicuran-MA, Tribunel, maize stalk mulch, harvesting of weed and seed increase rate. Among all the three row geometries, grain yield was higher in 45 cm apart rows than the usual method of planting in 30 cm row spacing. Tribunel application produced higher yield followed by mechanical hoeing twice. High 1000 grain weight was observed in the application of Tribunel, Dicuran-MA and the mulching of maize stalk. More grains/spike have been noted in the application of Tribunel. The lowest grain yield/ha, 1000 grain weight and grains/spike were recorded in the check
The Current Role of Androgen Deprivation in Patients Undergoing Dose-Escalated External Beam Radiation Therapy for Clinically Localized Prostate Cancer
Michael J. Smith,Naveed H. Akhtar,Scott T. Tagawa
Prostate Cancer , 2012, DOI: 10.1155/2012/280278
Abstract: Purpose. To review existing literature on the role of androgen deprivation therapy (ADT) with dose escalated radiation therapy. Methods and Materials. A PubMed search was undertaken to identify relevant articles. Results. Multiple recent studies were identified examining the role of ADT in the current era of radiation dose-escalation. Among the reviewed studies, varying radiation doses and techniques, ADT regimens, and patient selection criteria were utilized. Conflicting results were reported, with some studies demonstrating a benefit of delivering a higher radiation dose with ADT. Other studies failed to show significant benefits with the addition of ADT to dose-escalated RT. Conclusions. The benefit of adding ADT to dose-escalated RT is still uncertain. Prospective randomized trials, several of which are ongoing, are necessary to more adequately examine this issue. In the interim, physicians and patients should continue to utilize the existing data to weigh the risks and benefits of each approach to therapy. 1. Introduction Significant improvements in outcome have been achieved in the treatment of prostate cancer (PC) over the last couple of decades. Advancements in external beam technology, such as intensity-modulated radiation therapy (IMRT) and image-guided radiation therapy (IGRT) have allowed for dose escalation, with improvements in biochemical failure and rate of distant metastases (though no overall survival (OS) benefits have yet been demonstrated), without an accompanying increase in short- and intermediate-term toxicity [1–3]. We have also learned through multiple phase III randomized trials that the addition of ADT to external beam radiation therapy (EBRT) in unfavorable or locally-advanced cancers leads to improvements in disease-free survival (DFS), and prostate cancer-specific survival, as well as in OS (Table 1) [4–14]. However, in all of these studies, radiation doses ≤70?Gy were delivered, which are below the current standard doses used. In addition, it is increasingly recognized that ADT may be associated with acute and long-term toxicity. One controversy that currently exists in the radiation community is the role of ADT with dose-escalated radiation therapy in intermediate-risk and high-risk patients. This paper is intended to summarize existing data looking at this issue. In addition, a brief review of toxicity of hormonal therapy will be discussed. Table 1 2. Materials and Methods A PubMed literature search was undertaken, and relevant articles were reviewed. Search words and phrases included “dose-escalated radiation therapy
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