44 results on '"Hassan, Aamir"'
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2. Behavior of partial-length stiffened and full-length stiffened CFDST columns under axial load
- Author
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Hassan, Aamir and Bhat, Javed Ahmad
- Published
- 2024
- Full Text
- View/download PDF
3. Nexus between Entrepreneurship Education, Motivations, and Intention among Indian University Students: The Role of Psychological and Contextual Factors
- Author
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Hassan, Aamir, Anwar, Imran, Saleem, Ambreen, Alalyani, Wafa Rashid, and Saleem, Imran
- Abstract
This study assesses the impact of different psychological and contextual factors on entrepreneurial motivations and the role of entrepreneurial motivations in determining the entrepreneurial intention of students at Indian universities. The paper also explores whether gender acts as a moderator in the entrepreneurial motivation-intention relationship. Cross-sectional data were collected by administering a questionnaire to 329 students who had received entrepreneurship education during their course program. A confirmatory factor analysis model was run to ensure the model's fitness, reliability, and validity, while structural equation modelling was used to test the hypotheses. The study validates the following key findings. First, the psychological factors of perceived cultural support and entrepreneurship education foster entrepreneurial motivations, which help determine students' entrepreneurial intention, whereas fear of failure negatively affects students' entrepreneurial motivations. Second, the contextual factors of government support policies and access to entrepreneurial finance do not influence entrepreneurial motivations. Third, entrepreneurial motivations significantly enhance the entrepreneurial intention of students. Fourth, gender negatively moderates the entrepreneurial motivation-intention relationship. The study contributes to the literature on the entrepreneurial motivation-intention relationship using psychological and contextual factors and also explores the interaction effect of gender on that relationship.
- Published
- 2022
- Full Text
- View/download PDF
4. Drivers of venture creation in agricultural sector: a GEM data-based study
- Author
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Hussain, Syed Abid, Shamim, Mohd, Sofi, Zubair Ahmad, Arafat, Mohd Yasir, and Hassan, Aamir
- Published
- 2022
- Full Text
- View/download PDF
5. Individual Entrepreneurial Orientation, Entrepreneurship Education and Entrepreneurial Intention: The Mediating Role of Entrepreneurial Motivations
- Author
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Hassan, Aamir, Anwar, Imran, Saleem, Imran, Islam, K. M. Baharul, and Hussain, Syed Abid
- Abstract
This paper examines the direct and indirect roles of individual entrepreneurial orientation and entrepreneurship education in determining students' entrepreneurial intention through the mediation of entrepreneurial motivations. The study also attempts to ascertain the influence of entrepreneurship education on individual entrepreneurial orientation. Cross-sectional data were collected from 323 university students using the convenience sampling method. Confirmatory factor analysis was used to assess the model fitness and the reliability and validity of the data while hypotheses were tested using structural equation modeling. The findings affirm that entrepreneurship education facilitates both individual entrepreneurial orientation and entrepreneurial motivations and also has a positive association with entrepreneurial intention. More importantly, entrepreneurial motivations significantly mediate individual 'entrepreneurial orientation--entrepreneurial intention' and 'entrepreneurship education--entrepreneurial intention' relationships. The findings provide practical support for the framing of new educational policies to assist students in their existing and future entrepreneurial projects. The study contributes to the literature by recognizing the mediating effect of entrepreneurial motivations on the above relationships. It also adds to the scarce literature on the lately recognized individual entrepreneurial orientation construct.
- Published
- 2021
- Full Text
- View/download PDF
6. Behaviour of CFDST and RCC member hybrid frames
- Author
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Hassan, Aamir and Bhat, Javed Ahmad
- Published
- 2021
- Full Text
- View/download PDF
7. Entrepreneurial Intention of Indian University Students: The Role of Opportunity Recognition and Entrepreneurship Education
- Author
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Hassan, Aamir, Saleem, Imran, Anwar, Imran, and Hussain, Syed Abid
- Abstract
Purpose: The purpose of this study is to investigate the impact of opportunity recognition and entrepreneurial self-efficacy on the entrepreneurial intention of Indian university students. This paper also examines the moderating role of entrepreneurship education and gender on the opportunity recognition-intention and self-efficacy--intention relationships. Design/methodology/approach: The data were collected through a comprehensive questionnaire from 334 students having business and management background. Confirmatory factor analysis was used to ensure the reliability and validity of all the constructs, and structural equation modeling was used to test the proposed hypotheses. Findings: This study unveils three important findings. First, opportunity recognition and self-efficacy both show a significant positive impact on the entrepreneurial intention of students. Second, education positively moderates "self-efficacy--intention relationship", and third, gender negatively moderates "opportunity recognition-intention" and "self-efficacy--intention" relationships. Research limitations/implications: This study has been carried out using a sample of students from only one university, and the study included only business and management background students. Similar studies can be conducted by adding more motivational and contextual factors with an increased sample size of students having different educational backgrounds. Practical implications: This study provides pragmatic support to formulate new educational initiatives that can support students in their present or future entrepreneurial projects. Originality/value: This study adds to the scarce literature on opportunity recognition and entrepreneurial intention and also highlights the moderating role of entrepreneurship education and gender on opportunity recognition-intention and entrepreneurial self-efficacy--intention relationships.
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- 2020
- Full Text
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8. Joint power and spectrum allocation for D2D communication overlaying cellular networks
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Zeb, Jehan, Hassan, Aamir, and Nisar, Muhammad Danish
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- 2021
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- View/download PDF
9. Cognitive Antecedents of the Agricultural Entrepreneurship Intentions of Indian University Students
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Hussain, Syed Abid, primary, Ahmad, Gayas, additional, Khan, Adil, additional, Hassan, Aamir, additional, and Shamim, Mohd, additional
- Published
- 2022
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10. Integration of genome scale data for identifying new biomarkers in colon cancer : integrated analysis of transcriptomics and epigenomics data from high throughput technologies in order to identify new biomarkers genes for personalised targeted therapies for patients suffering from colon cancer
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Ul Hassan, Aamir
- Subjects
616.99 ,Colon cancer ,Microarray gene expression profiling ,Gene ontology enrichment analysis ,MicroRNA ,System biology ,Bioinformatics ,Gene signature ,Cross-validation ,Diagnostic ,Prognostic - Abstract
Colorectal cancer is the third most common cancer and the leading cause of cancer deaths in Western industrialised countries. Despite recent advances in the screening, diagnosis, and treatment of colorectal cancer, an estimated 608,000 people die every year due to colon cancer. Our current knowledge of colorectal carcinogenesis indicates a multifactorial and multi-step process that involves various genetic alterations and several biological pathways. The identification of molecular markers with early diagnostic and precise clinical outcome in colon cancer is a challenging task because of tumour heterogeneity. This Ph.D. thesis presents the molecular and cellular mechanisms leading to colorectal cancer. A systematical review of the literature is conducted on Microarray Gene expression profiling, gene ontology enrichment analysis, microRNA and system Biology and various bioinformatics tools. We aimed this study to stratify a colon tumour into molecular distinct subtypes, identification of novel diagnostic targets and prediction of reliable prognostic signatures for clinical practice using microarray expression datasets. We performed an integrated analysis of gene expression data based on genetic, epigenetic and extensive clinical information using unsupervised learning, correlation and functional network analysis. As results, we identified 267-gene and 124-gene signatures that can distinguish normal, primary and metastatic tissues, and also involved in important regulatory functions such as immune-response, lipid metabolism and peroxisome proliferator-activated receptors (PPARs) signalling pathways. For the first time, we also identify miRNAs that can differentiate between primary colon from metastatic and a prognostic signature of grade and stage levels, which can be a major contributor to complex transcriptional phenotypes in a colon tumour.
- Published
- 2017
11. Development of Circular Multicell Double-Skin Tubular Columns: Testing and Improved Axial Performance.
- Author
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Hassan, Aamir, Bhat, J. A., and Dar, Mohammad Adil
- Subjects
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STEEL tubes , *STIFFNERS , *COLUMNS , *STEEL fracture , *COMPRESSIVE strength - Abstract
Double-skin tubular columns (DSTCs) represent one of the most novel column systems for future structures, such as bridges, flyovers, high-rise buildings, and towers, due to their higher axial compressive strength and improved ductility characteristics. The enhanced confinement of the concrete is the primary reason for the improved axial compressive strength and superior ductility in DSTCs. However, the steel in DSTCs is localized to the outer and inner layers only, without any connecting element in-between inner and outer steel tubes. As a result, a significant sudden drop in the load-carrying capacity has been observed in DSTCs as soon as the outer or inner steel tube fails. However, the failure in inner and outer steel tubes can be significantly delayed or prevented if they are connected through stiffeners. The present study, through an extensive experimental investigation, focused on effectively strengthening and connecting both the outer and inner tubes in DSTCs by adopting various stiffener schemes. Additionally, the stiffeners split the concrete core into discrete concrete cells. Accordingly, in the current study, these columns have been referred to as multicell double-skin tubular columns (MC-DSTCs). From the experimental observations, axial compressive strengths in MC-DSTCs were higher than that in the unstiffened DSTCs by up to 62%. Further, MC-DSTCs exhibited larger axial deformations compared with the unstiffened DSTCs, improving their ductility index by up to 253%. The increased axial strengths and ductility in MC-DSTCs have been attributed to delayed and controlled failure of steel and concrete components because of the improved participation of inner and outer tubes through stiffener connections. Finally, a design model has been proposed based on the concept of concrete confinement in MC-DSTCs to accurately predict their axial compressive strength, which has been verified through a regression analysis. A good correlation (with R2=0.986) between the predicted and experimental axial compressive strengths of MC-DSTC was observed. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
12. Durability of Green Concrete Composed of Fly Ash, GGBS, Quarry Dust, and RCA after Acid Exposure.
- Author
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Hiremath, Parameshwar, Parray, Abdul Basit, Hassan, Aamir, and Kankeri, Pradeep
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FIELD emission electron microscopy ,CALCIUM silicate hydrate ,CONCRETE durability ,INDUSTRIAL wastes ,FLY ash ,COMPRESSIVE strength - Abstract
Green concrete utilizes industrial waste resources as fine and coarse aggregates, to partially replace cement in concrete using supplemental cementitious materials. The primary goal of the present study was to explore the acid durability of green concretes with different compressive strengths of 30 and 40 MPa. In green concrete, fly ash and ground granulated blast furnace slag (GGBS) were adopted as SCMs, and quarry dust (QD) and recycled coarse aggregates (RCA) were adopted as replacements for fine and coarse aggregates, respectively. The acid durability assessment was carried out by immersing concrete cubes in H2SO4 and HCl solutions followed by residual compressive strength comparison. For comparative study purposes, the same grades of ordinary concrete were prepared, tested, and subjected to similar acid exposure. The microstructural investigation was also accomplished by employing field emission scanning electron microscopy (FE-SEM) analysis and energy-dispersive X-ray spectroscopy (EDS). It was found that concrete with 30% GGBS and 20% fly ash and the remaining 50% ordinary portland cement as cementitious materials along with 40% QD and 30% RCA as aggregate replacements gives adequate compressive strength and performs better in aggressive environments as compared to traditional concrete. These mixes were found to have denser microstructures with silica-rich, calcium silicate hydrate (C-S-H) gel. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
13. Assessment of the Sustainability of Land Use Systems through Sensitive Indicators of Soil Quality and Biophysical Properties in Temperate Ecosystem.
- Author
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Ahmad, Roheela, Hassan, Aamir, Sheikh, Tahir, Mir, Shakeel, Rifat-un-Nisa, Alkilayh, Omar A., Hamid, Basharat, Baba, Zahoor, and Sayyed, Riyaz Z.
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SOIL quality ,PARTICLE size distribution ,PRINCIPAL components analysis ,CARBON in soils ,MICROORGANISM populations ,CORN - Abstract
GOOD SOIL can raise the quantity and quality of food. However, the land quality has worsened due to various anthropogenic activities. The present study aimed to assess the effects of land use systems on soil quality over time through specific indicators. A top 30 cm soil sample from six land uses (forest, pasture, orchard, vegetable, maize, and paddy) was analyzed for soil quality index using Principal Component Analysis. The results revealed the highest organic carbon (20.94±1.85 g kg
-1 ), N (537.50±16.7 kg ha-1 ), and P2 O5 (36.51±1.62 kg ha-1 ) in paddy-based land uses while the minimum OC (8.63±1.23 g kg-1 ), N (290.30±1.8 kg ha-1 ) and K2 O (201.36±6.2 kg ha-1 ) respectively with lowest P2O5 (24.22±1.21 kg ha-1 ) in maize. The forest system showed dense macrofauna (1498 ind. m-2). The microbial population was found in the order of paddy>maize>vegetable>apple>pasture>forest. Particle size distribution of studied land uses varied from silty loam to clay loam. The following order of soil quality: forest>pasture>apple >vegetable>maize>paddy was found after the indexing procedure. It is concluded that further extension and turning of natural forests to agriculture will lead to a more significant loss of stored carbon from soils. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
14. FANCONI SYNDROME SECONDARY TO CYSTINOSIS IN YOUNG MALE: A CASE REPORT
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Samina Bibi, Mian Sameer Ahmed, Bakht Babar, Tahir Ghaffar, Azizul Hassan Aamir, and Sana Aziz
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hypokalemia ,acidosis ,proteinuria ,hypercalciuria ,fanconi syndrome ,cystine ,cystinosis ,Medicine - Abstract
INTRODUCTION: Nephropathic cystinosis is a rarely occurring inherited metabolic disorder, leading to Fanconi syndrome, progressive renal failure and a range of extra-renal manifestations including endocrinopathies. There is no definitive cure for Cystinosis. Never the less, early introduction of cysteamine treatment and other supportive measures can adequately retard the occurrence of complications and improve prognosis. CASE DESCRIPTION: An 18-year-old boy who presented with complaints of abdominal pain, vomiting, polyuria and episodes of periodic paralysis for the last 01 year to the Endocrine Unit, Medical Teaching Institution Hayatabad Medical Complex, and Peshawar, Pakistan. He was lean and wasted with a BMI of 12.9kg/m2 (weight=32.59kg, height=159cm) having frontal bossing and splaying of bones at wrist joint with normal to low blood pressure. Investigations revealed hypokalemia, alkaline urine and metabolic acidosis on arterial blood gas analysis. Consequently, his symptoms were attributed to underlying renal tubular acidosis. Later, slit lamp examination revealed Cysteine crystals in the cornea confirming the diagnosis of Cystinosis as the underlying cause. He was started on supportive therapy including potassium chloride and citrate supplements, intravenous fluids, calcium and vitamin D supplements and Indomethacin. Senior nephrologist and Nutritionist were also taken on board regarding his management. Follow up at 02 months was suggestive of marked symptomatic and biochemical improvement. CONCLUSION: Data regarding the definitive cure for Cystinosis is scarce. Never the less, early introduction of cysteamine therapy and other supportive measures can adequately retard the occurrence of complications and improvise prognosis.
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- 2021
- Full Text
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15. Entrepreneurial intention of university students: A moderated approach using entrepreneurship education.
- Author
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Dar, Arsheed Ahmad, Hurrah, Shabir Ahmad, Hassan, Aamir, Mansuri, BB, and Saleem, Ambreen
- Abstract
This study aims to examine the impact of students' entrepreneurial self-efficacy on their opportunity recognition capability after their exposure to classroom-based entrepreneurship education, leading to the development of intention to undertake an entrepreneurial activity. A detailed questionnaire was used to collect data from 351 students pursuing undergraduate and postgraduate courses. Results confirm that the student's entrepreneurial self-efficacy positively influences their intention to undertake an entrepreneurial activity directly and indirectly via their opportunity recognition capability. Also, entrepreneurship education significantly moderates the link between students' entrepreneurial self-efficacy and opportunity recognition capability. These results have practical implications for universities and policymakers, as universities that are not providing entrepreneurship education can adopt the same module of classroom education. Also, policymakers can frame policies directing institutions to start similar kinds of entrepreneurship education programs, even at the intermediate level, particularly in lower-middle-income countries. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
16. Psychological aspects affecting the venture performance of Indian women entrepreneurs
- Author
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Saleem, Imran, primary, Saleem, Ambreen, additional, Hassan, Aamir, additional, Farukh, Mohd Umar, additional, and Kamran, Hyder, additional
- Published
- 2023
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- View/download PDF
17. Entrepreneurial intention of university students: A moderated approach using entrepreneurship education
- Author
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Dar, Arsheed Ahmad, primary, Hurrah, Shabir Ahmad, additional, Hassan, Aamir, additional, Mansuri, BB, additional, and Saleem, Ambreen, additional
- Published
- 2023
- Full Text
- View/download PDF
18. Effectiveness of Stiffeners in CFDST Columns: Comparative Study
- Author
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Hassan, Aamir, primary and Ahmad Bhat, Javed, additional
- Published
- 2023
- Full Text
- View/download PDF
19. Behavior of partial-length stiffened and full-length stiffened CFDST columns under axial load
- Author
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Hassan, Aamir, primary and Bhat, Javed Ahmad, additional
- Published
- 2023
- Full Text
- View/download PDF
20. Nexus between entrepreneurship education, motivations, and intention among Indian university students: The role of psychological and contextual factors
- Author
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Hassan, Aamir, primary, Anwar, Imran, additional, Saleem, Ambreen, additional, Alalyani, Wafa Rashid, additional, and Saleem, Imran, additional
- Published
- 2021
- Full Text
- View/download PDF
21. Vehicular ad hoc networks (VANETS): status, results, and challenges
- Author
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Zeadally, Sherali, Hunt, Ray, Chen, Yuh-Shyan, Irwin, Angela, and Hassan, Aamir
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- 2012
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- View/download PDF
22. Entrepreneurial intention of Indian university students: the role of opportunity recognition and entrepreneurship education
- Author
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Hassan, Aamir, primary, Saleem, Imran, additional, Anwar, Imran, additional, and Hussain, Syed Abid, additional
- Published
- 2020
- Full Text
- View/download PDF
23. Association Of Serum Total Bilirubin Level With Diabetic Retinopathy In Type 2 Diabetes Mellitus
- Author
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Tahir, Ghaffar, Zahid Irfan, Marwat, Fahim, Ullah, Salman, Khan, and Aziz Ul, Hassan Aamir
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Male ,Diabetic Retinopathy ,Diabetes Mellitus, Type 2 ,Case-Control Studies ,Humans ,Bilirubin ,Female ,Middle Aged - Abstract
Serum bilirubin has anti-inflammatory, antioxidant and immunological properties. It is considered a protective substance against atherosclerotic and microvascular complications of diabetes mellitus (DM). This study was designed to find the association between total serum bilirubin concentration and diabetic retinopathy (DR).This case control study was conducted in the Department of Endocrinology, Diabetes and Metabolic Diseases, Hayatabad Medical Complex, Peshawar. Type-2 DM patients more than 18 years of age of either gender with duration of T2DM more than 6 months were included and sub categorized in two groups. Cases (DM with DR) and Controls (DM without DR) while patients with acute and chronic liver diseases, haemolytic anaemia, history of chronic alcohol consumption, use of hepatotoxic drugs (anti-tuberculous, anti-epileptic), women on oral contraceptive pills were excluded. All participants underwent ophthalmic examination at diabetic retinopathy screening clinic followed by pre designed set of investigations.A total of 152 patients, 76 cases and 76 controls were included. Serum bilirubin concentration was found inversely and independently (p 0.000) associated and inversely co related (r -0.345and p 0.000) with prevalence of DR. Cases were concentrated in the lower quartiles of serum bilirubin concentration and vice versa. Low haemoglobin (p 0.00) and longer duration of DM (0.003) were independently and directly associated with prevalence of DR.Serum bilirubin concentration is inversely and independently associated and inversely correlated with the prevalence of DR and may predict progression of DR over time.
- Published
- 2017
24. Individual entrepreneurial orientation, entrepreneurship education and entrepreneurial intention: The mediating role of entrepreneurial motivations
- Author
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O’hUigin, Daithí, Galloway, Laura, Brentnall, Catherine, McGowan, Pauric, Hassan, Aamir, Anwar, Imran, Saleem, Imran, Islam, K.M. Baharul, and Hussain, Syed Abid
- Abstract
This paper examines the direct and indirect roles of individual entrepreneurial orientation and entrepreneurship education in determining students’ entrepreneurial intention through the mediation of entrepreneurial motivations. The study also attempts to ascertain the influence of entrepreneurship education on individual entrepreneurial orientation. Cross-sectional data were collected from 323 university students using the convenience sampling method. Confirmatory factor analysis was used to assess the model fitness and the reliability and validity of the data while hypotheses were tested using structural equation modeling. The findings affirm that entrepreneurship education facilitates both individual entrepreneurial orientation and entrepreneurial motivations and also has a positive association with entrepreneurial intention. More importantly, entrepreneurial motivations significantly mediate individual ‘entrepreneurial orientation–entrepreneurial intention’ and ‘entrepreneurship education–entrepreneurial intention’ relationships. The findings provide practical support for the framing of new educational policies to assist students in their existing and future entrepreneurial projects. The study contributes to the literature by recognizing the mediating effect of entrepreneurial motivations on the above relationships. It also adds to the scarce literature on the lately recognized individual entrepreneurial orientation construct.
- Published
- 2021
- Full Text
- View/download PDF
25. Yield and Nitrogen Content of Wheat (Triticum aestivum) as Affected by FYM and Urea in Cold Arid Region of India
- Author
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Hassan, Aamir, primary, Malik, Ajaz, additional, Ahmad, Shahid, additional, Asif, Malik, additional, Mir, S. A., additional, Bashir, Owais, additional, and Safal, R., additional
- Published
- 2018
- Full Text
- View/download PDF
26. Erectile dysfunction and type 2 diabetes mellitus in northern Pakistan
- Author
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Ibrar, Ahmed, Aziz ul Hassan, Aamir, Ejaz, Anwar, Sobia Sabir, Ali, Asfhaq, Ali, and Amjad, Ali
- Subjects
Adult ,Blood Glucose ,Glycated Hemoglobin ,Male ,Waist-Hip Ratio ,Age Factors ,Lipids ,Body Mass Index ,Cross-Sectional Studies ,Diabetes Mellitus, Type 2 ,Erectile Dysfunction ,Risk Factors ,Surveys and Questionnaires ,Humans ,Pakistan - Abstract
To determine the frequency of erectile dysfunction in married male Type-2 diabetic patients.The cross-sectional observational study was carried out at the Endocrinology, Diabetes and Metabolic Diseases Unit Hayatabad Medical Complex, Peshawar, from July 2011 to Apr 2012, comprising 217 male married Type-2 diabetic patients. Serum samples were assayed for blood glucose, lipid profile and glycated haemoglobin A1c. Body mass index and waist-to-hip ratio was calculated. Erectile dysfunction was assessed by Sexual Health Inventory for Men questionnaire. SPSS 18 was used for statistical analysis.A total of 217 patients were initially interviewed. The mean age was 43.1 +/- 8.160 years. The frequency of drectile dysfunction increased with age, duration of patients and increased body mass index. Overall, 6 (2.8%) patients had no erectile dysfunction, 37 (17.1%) had mild, 82 (37.8%) mild to moderate; 47 (21.7%) moderate; and 45 (20.7%) severe. Higher HbAlc levels and atherogenic dyslipidaemia were associated with erectile dysfunction.Poor glycaemic control was associated with increased erectile dysfunction risk. Duration of diabetes, older age, increased body mass index are associated with increased incidence of the condition in patients with diabetes. Intensive lifestyle changes in the beginning can add to the better management of Type-2 diabetes and prevention of erectile dysfunction.
- Published
- 2014
27. Prevalence of peripheral arterial disease in type 2 diabetics in Pakistan
- Author
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Javed, Akram, Aziz-ul-hassan, Aamir, Abdul, Basit, Mohammad Saleem, Qureshi, Tariq, Mehmood, Syed Khurram, Shahid, Irshad Ahmed, Khoso, Muhammad Ashraf, Ebrahim, and Aamir, Omair
- Subjects
Adult ,Male ,Middle Aged ,Body Mass Index ,Peripheral Arterial Disease ,Age Distribution ,Cross-Sectional Studies ,Diabetes Mellitus, Type 2 ,Risk Factors ,Prevalence ,Humans ,Ankle Brachial Index ,Female ,Pakistan ,Sex Distribution ,Ultrasonography, Doppler, Color ,Diabetic Angiopathies ,Aged - Abstract
To observe the prevalence of peripheral arterial disease (PAD) and associated factors among people with type 2 diabetes in Pakistan.A multicenter cross-sectional study was carried out at eight centers in all the provinces of Pakistan on people with type 2 diabetes. History of symptoms related to Peripheral arterial disease were noted and anthropometric measurements were recorded. Ankle brachial index (ABI) was measured using Doppler ultrasound; patients with ABI0.9 were classified as having low ABI.There were 830 patients in the study, (49% males and 51% females). Females were younger and had a higher body mass index (BMI) (p0.001). The prevalence of peripheral arterial disease was 31.6% with a 95% CI of 28.4% to 34.8%. There was no significant difference in the proportion of low ABI between males (30%) and females (33%) (p = 0.29). Patients with low ABI were found to have significantly higher BMI (p = 0.02) and waist circumference (p = 0.001). The most common symptom in the patients with low ABI was pain on walking (84%), followed by numbness of the feet (64%). There was a significant difference in the reporting of all the symptoms (p0.05) except for numbness of the feet (p = 0.57) as compared to patients with normal ABI. No association was found between low ABI and duration of diabetes mellitus or cigarette smoking. There was no significant association between cardiovascular conditions and low ABI.Peripheral arterial disease is common among people with type 2 diabetes in Pakistan and needs to be properly evaluated by the medical professionals as early diagnosis can help prevent future complications.
- Published
- 2011
28. On the requirements on models and simulator design for integrated VANET Simulation
- Author
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Hassan, Aamir and Larsson, Tony
- Subjects
VANET ,Computer and Information Sciences ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,Data- och informationsvetenskap ,AdHoc Networks ,Simulation ,Modelling - Abstract
Wireless communication can reduce risks for collision between vehicles by the exchange of kinematic data. Vehicular safety applications based on such information sharing must be tested before it is deployed in real world. For this purpose simulation is a valuable complement to expensive outdoor experiments. Analysis of VANET applications requires that both a vehicle motion and a data network simulator can be used at the same time, feeding simulation data to each other. Tools exist for this purpose but most of them have problem with their integration. This article discusses how to simulate vehicular networks influenced by micro level vehicle motion and macro level traffic flow pattern models to analyze its effect on wireless communication. We discus the shortcomings of current VANET simulators and then provide recommendations for how to perform useful VANET simulations.
- Published
- 2011
29. Integrated Analysis of Gene Expression Data for Colon Cancer Biomarker Discovery
- Author
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Hassan, Aamir, primary, Zaka, Masood U.H., additional, Kouvatsos, Demetres, additional, and Peng, Yonghong, additional
- Published
- 2015
- Full Text
- View/download PDF
30. Network Security Analysis
- Author
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Hassan, Aamir and Mohammad, Fida
- Subjects
Network Security Analysis - Abstract
Security is the second step after that a successful network has been deployed. There are many types of attacks that could potentially harm the network and an administrator should carefully document and plan the weak areas, where the network could be compromised. Attackers use special tools and techniques to find out all the possible ways of defeating the network security. This thesis addresses all the possible tools and techniques that attackers use to compromise the network. The purpose for exploring these tools will help an administrator to find the security holes before an attacker can. All of these tools in this thesis are only for the forensic purpose. Securing routers and switches in the best possible way is another goal. We in this part try to identify important ways of securing these devices, along with their limitations, and then determine the best possible way. The solution will be checked with network vulnerable tools to get the results. It is important to note that most of the attention in network security is given to the router, but far less attention is given to securing a switch. This thesis will also address some more ways of securing a switch, if there is no router in the network. The opponent for the thesis was Yan Wang and the presentation time was 60 minutes.
- Published
- 2010
31. VANET Simulation
- Author
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Hassan, Aamir
- Subjects
Mobility ,Vehicular ,adhoc ,Simulation - Abstract
The number of automobiles has been increased on the road in the past few years. Due to high density of vehicles, the potential threats and road accident is increasing. Wireless technology is aiming to equip technology in vehicles to reduce these factors by sending messages to each other. The vehicular safety application should be thoroughly tested before it is deployed in a real world to use. Simulator tool has been preferred over out door experiment because it simple, easy and cheap. VANET requires that a traffic and network simulator should be used together to perform this test. Many tools exist for this purpose but most of them have the problem with the proper interaction. In this thesis, we aim at simulating vehicular networks with external stimulus to analyze its effect on wireless communication but to do this job a good simulator is also needed. So we will first debate on the shortcoming of current simulators and come up with our own recommendations to perform our simulation.
- Published
- 2009
32. Simultaneous Ultrasensitive Detection of Toxic Heavy Metal Ions Using bis(imidazo[4,5-f][1, 10]phenanthroline) Appended bis-triazolo Calix[4] Arene (8)/Glassy Carbon Electrode
- Author
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Sultan, Sundus, Shah, Afzal, Khan, Burhan, Qureshi, Rumana, Isa, Jameela, Raza, Muhammad, and, Shah, and Hassan, Aamir
- Abstract
A highly sensitive and selective electrochemical sensor has been developed and investigated for multiple metal ions detection. The GCE was modified with the synthesized multifunctional calix[4]arene and the anodic stripping voltammetry was used for the simultaneous electrochemical analysis of Cd2+, Pb2+ and Hg2+ ions. The analysis conditions were optimized with respect to modifier's loaded concentration, accumulation time, potential, supporting electrolyte and pH of the media. The bis(imidazo[4,5-f][1, 10]phenanthroline) appended bis-triazolo Calix[4] arene modified glassy carbon electrode (compound (8)/GCE) exhibited fast electron transfer rate for the stripping signals of Cd2+, Pb2+ and Hg2+ ions as evidenced from square wave anodic stripping voltammograms. The linear calibration curves were used for the evaluation of the detection limits with values of 0.037, 0.015 and 0.025 nM for Cd2+, Pb2+ and Hg2+ respectively. The modified electrode showed the qualities of repeatability, reproducibility and selectivity for Cd2+, Pb2+ and Hg2+ in the presence of common competitive metal ions. The study was extended to real water samples by sensing the traces of given metal cations in locally collected drinking water samples. The results reveal that the compound (8)/GCE is an extremely sensitive, cheap and portable electrochemical platform for the detection of multiple heavy metal ions in the drinking water reservoirs and seawater.
- Published
- 2019
33. Sensitive and Selective Detection of Multiple Metal Ions Using Amino Acids Modified Glassy Carbon Electrodes
- Author
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Nisar, Anum, Shah, Afzal, Zahid, Anum, Jan, Faiza, Hassan, Abbas, Hassan, Aamir, She, Zhe, Salim, Mohammad, Piro, Benoit, and Kraatz, Bernhard
- Abstract
We report for the first time the electrochemical detection of Zn2+, Cd2+, Cu2+ and Hg2+ at the surface of modified glassy carbon electrodes with different amino acids. The designed sensors showed superior heavy metal ion (HMs) detection limits, which are at lower levels than the thresholds suggested by the World Health Organization. The influence of the concentration of the modifier, pH, accumulation time, deposition potential and supporting electrolytes were tested for achieving the best sensing response of the analytes. The sensors demonstrated remarkable electrocatalytic activity and excellent discrimination ability for the target analytes in the presence of 200-fold higher concentration of interfering agents. Glycine was found to have the best HMs chelation ability among all the eight natural amino acids tested experimentally in this work. Theoretical DFT-based computational calculations supported the experimental results of HM-amino acid interaction. Thus, this work not only reports sensors with enhanced detection capability for HMs but also provides useful insights toward future designing of water filters containing amino acids-based materials for metal sequestration.
- Published
- 2018
34. Vehicular ad hoc networks (VANETS): status, results, and challenges
- Author
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Zeadally, Sherali, primary, Hunt, Ray, additional, Chen, Yuh-Shyan, additional, Irwin, Angela, additional, and Hassan, Aamir, additional
- Published
- 2010
- Full Text
- View/download PDF
35. An Electrochemical Sensing Platform for the Trace Level Detection of Copper
- Author
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Shah, Afzal, Sultan, Sundus, Hassan, Aamir, Nayab, Saira, Shahzada, Gul, and, Khan, and Hussain, Hazrat
- Abstract
The present work is aimed at the development of highly sensitive electrochemical sensor based on immobilization of 1-phenyl-N-(thiophen-2-ylmethyl)ethanamine (PTE) on glassy carbon electrode (PTEGCE) for the detection of cupric ions (Cu2+), employing electrochemical impedance spectroscopy (EIS) differential pulse anodic stripping voltammetry (DPASV) and square wave anodic stripping voltammetry (SWASV). Several experimental parameters were optimized including concentration of the modifier, pH, and scan rate, number of cycles, accumulation time, deposition potential and supporting electrolytes. The designed sensor showed nice voltammetric response in media of different pH, demonstrated good percentage recoveries and exhibited remarkable electrocatalytic activity. The designed sensor was also not interfered much by the presence of other metal ions. A wide linear range with very low limit of detection as compared to the reported methods reveal the applicability of our designed sensor as a preferred analytical tool. The limit of detection as low as 0.11 nM was obtained using PTEGCE. We expect that these results will let the chemists to apply this sensor for various metallic, organic and organometallic toxins with slight modification.
- Published
- 2017
36. Gold-Ruthenium Alloy Nanoparticles Modified Glassy Carbon Electrode as a Sensing Platform for the Trace Level Detection of Indol-3-Carbaldehyde
- Author
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Shah, Afzal, Mahmood, Ansar, Mehmood, Rashad, Rehman, Saif ur, Aysil, Sibel, and, Ozkan, and Hassan, Aamir
- Abstract
In the present work we have proposed a novel strategy for the detection of indol-3-carbaldehyde (I3C) using Au-Ru alloy nanoparticles (NPs) modified glassy carbon electrode. The work is focused on achieving the optimum conditions for getting robust signal of I3C over NPs modified electrode surface. The alloy NPs of Au-Ru were synthesized by polyols method and characterized by XRD and UV-visible spectroscopy. Cyclic, square wave and differential pulse voltammetry were used for investigating the performance of the designed sensor for the electroanalysis of I3C. The developed sensor showed nice voltammetric response in media of different pH and demonstrated remarkable electrocatalytic activity and anti-interference ability. A linear calibration curve for indol-3-carbaldehyde was obtained in the concentration range of 20-100 uM with a correlation coefficient of 0.99. The results revealed that 1.89 uM concentration of I3C can be reliably detected at Au-Ru modified glassy carbon electrode. Moreover, the designed sensor showed excellent analytical characteristics such as high selectivity, reproducibility, wide linearity range and lower limit of detection.
- Published
- 2017
37. Poly (phenazine 2,3-diimino(pyrrole-2-yl)) as Redox Stimulated Actuator Material for Selected Organic Dyes
- Author
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Jan, Faiza, Shah, Afzal, L, Priscilla G., Iwuoha, Emmanuel I., Haider, Adnan, Abid, Muhammad, Nisar, Jan, Siddiq, Muhammad, and Hassan, Aamir
- Abstract
The use of polymers as actuator materials has been reported extensively in the recent years. Polymers based actuators have specifically drawn attention of scientists as valves for drug delivery applications. This spurred us on for studying the actuation properties of doped polypyrrole based phenazine derivative and its drug delivery application using cyclic voltammetry, square wave voltammetry, UV-Vis spectroscopy and electrochemical impedance spectroscopy. We investigated the flexibility provided by molecular hinged linking molecule (phenazine) in an accordion type polymer- poly(phenazine 2,3-diimino(pyrole-2-yl)) doped with polyvinyl sulfonic acid (PVSA) with the objective of getting insights about generation of conformational changes required for the introduction of large space volume for actuation. The actuation thus developed was tested on redox dyes such as pyrocatechol violet and methyl orange for their controlled adsorption and release from the doped polymeric material to assess its potential as a smart drug delivery device.
- Published
- 2017
38. Monitoring of an Anti-Ulcer Drug Rabeprazole Using Au-Pt Bimetallic Alloy Nanoscale Electrochemical Sensor
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Mahmood, Ansar, Shah, Afzal, Shahzad, Suniya, Aftab, Saima, Nisar, Jan, and Hassan, Aamir
- Abstract
A new highly selective and sensitive electrochemical sensor has been developed, whereby working electrode is modified with bimetallic Au-Pt alloy nanoparticles (NPs). Au-Pt alloy NPs were prepared by a facile method using non/less toxic chemicals. The optical properties of the synthesized NPs were studied by UV-Visible spectroscopy. The surface structure was characterized by X-ray diffraction and scanning electron microscopy. The NPs were found spherical with an average diameter of 14.6 nm. The electrochemical response of modified electrode with polypyrrole and Au-Pt alloy NPs toward the detection of rabeprazole (antiulcer drug) was systematically investigated though cyclic, square wave and differential pulse voltammetry methods. Under optimized conditions, the developed sensor showed its promise for the trace level (1.29 uM) detection of the analyte. Moreover, the designed sensor demonstrated excellent reproducibility and maintained its integrity in a wide pH range and different supporting electrolytes for the sensing of rabeprazole. The Au-Pt alloy NPs based electrochemical sensor exhibited good selectivity, high sensitivity and stability, fast response time, ease of use and reproducibility.
- Published
- 2017
39. pH Dependent Electrochemical Characterization, Computational Studies and Evaluation of Thermodynamic, Kinetic and Analytical Parameters of Two Phenazines
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Hassan, Aamir, Zaid, Waqar, Shah, Afzal, Ali, Usman, Hussain, Hidayat, Naeem, Muhammad, Qureshi, Rumana, Badshah, Amin, Abid, Muhammad, and, Zia, and Kraatz, Bernhard
- Abstract
The electrochemical response of two biologically important phenazine derivatives was examined by using cyclic, differential pulse and square wave voltammetry in a wide pH range of 2.0 - 12.0. Cyclic voltammetry was employed for the determination of heterogeneous electron transfer rate constant and diffusion coefficient of the analytes. The value of electron transfer rate constant was used for evaluation of Gibbs free energy, enthalpy and entropy changes of redox reactions of the compounds. Differential pulse voltammetry was used for the determination of number of protons and electrons involved in the redox processes. Limits of detection and quantification were assessed by square wave voltammetry. The detailed pH dependent redox mechanisms of the compounds were proposed on the basis of experimental results which were further supported by theoretical calculations. These redox mechanistic pathways are expected to play a key role in understanding the necessary aspects of structure-activity relationships and exploring the hidden routes by which this class of compounds exert its biochemical actions.
- Published
- 2015
40. Synthesis, Spectroscopic Characterization, pH Dependent Electrochemistry and Computational Studies of Piperazinic Compounds
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Parveen, Nazia, Shah, Afzal, Zeb, Shahan, Ud, Salah, Khan, Din, Ali, Usman, Fathi, Farkhondeh, Hassan, Aamir, Naeem, Muhammad, Rauf, Abdur, Qureshi, Rumana, Rehman, ur, and Kraatz, Bernhard
- Abstract
This work presents the synthesis, redox behavior and spectroscopic characterization of two novel compounds Sodium 4-(3-methoxyphenyl) piperazine-1-carbodithioate and sodium 4-(4-nitrophenyl) piperazine-1-carbodithioate. Pulse voltammetric techniques were utilized to determine the number of electrons involved in the oxidation and/or the reduction step and to ensure the nature of the redox processes. The pH dependent redox mechanistic pathways of the compounds were proposed on the basis of electrochemical and computational results. Different thermodynamic parameters like DG# and DH# revealed that electrode processes are non-spontaneous and endergonic in nature. Increase in DS# values at higher temperature indicated the randomness of the electrode reactions at higher temperatures. Limits of detection and quantification were determined by square wave voltammetry due to its high sensitivity and fast speed. Ionization energy, electron affinity, dipole moment and charge distribution on atoms were computationally determined. Acid-base dissociation constant (pKa) values of the compounds evaluated by voltammetry and electronic spectroscopy were found comparable.
- Published
- 2015
41. Detailed Electrochemistry of the Environmental Toxin Ethylene Diamine
- Author
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Munir, Azeema, Shah, Afzal, Hassan, Aamir, Ali, Usman, Adhikari, Bimalendu, Bahadar, Sher, Qureshi, Rumana, and Kraatz, Bernhard
- Abstract
The electrochemical fate of ethylene diamine (ED) was probed at the surface a glassy carbon electrode over a wide range of pH 2-12 using cyclic, differential pulse and square wave voltammetry. A single quasi-reversible anodic peak followed by a reversible voltammetric signature of the oxidized product was evidenced in the first and second scan cyclic voltammograms. The quasi-reversible nature of the electron abstraction process of ED was witnessed by the unequal anodic and cathodic peak currents, scan rate deviation of peak potential and the value of heterogeneous electron transfer rate constant. On the contrary, cyclic and square wave voltammetric results revealed the redox behavior of the oxidized product of ED to be reversible. The redox mechanism was proposed on the basis of the obtained results in order to offer useful guidelines for protection against the harmful effects of diamines. As the presence of diamines in aqueous system is a serious threat to living organisms so we developed and validated a sensitive, robust, specific and reproducible square wave voltammetric method for the rapid determination of low concentration of ED. The linearity was achieved within the concentration range from 30 to 100 uM with LOD = 47.4 uM. Precision was checked with recovery studies.
- Published
- 2014
42. Abiotic Stress Tolerance in Cotton
- Author
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Ijaz, Muhammad, Hussain, Ijaz, Saleem, Muhammad Zain, Rasheed, Iqra, Sami-Ullah, Sher, Ahmad, Sattar, Abdul, and Hassan, Aamir
- Subjects
Technology & Engineering / Agriculture - Abstract
Cotton (Gossypium hirsutum L.) is a vital fiber crop that is being cultivated under diverse climatic conditions across the globe. The demand for cotton and its by-products is increasing day by day due to more consumption of this fiber in the textile industry and the utilization of cotton seed as a source of edible oil. However, the average seed cotton yield in the world is below that of the potential yield of cultivars. The factors responsible for low yield includes shortage of approved seed, pest and disease attack, weed infestation, unwise use of nutrients, and the incidence of abiotic stresses (including drought, heat, and salinity). Among these, the abiotic stresses are a single major factor, which is responsible for reducing the yield now and will affect the productivity of cotton in future. In this scenario, it is necessary to adopt ways to improve the tolerance of cotton against abiotic stresses. The strategies for improving tolerance against abiotic stresses may include the wise use of macro- and micronutrients, the use of osmoprotectants, the use of arbuscular mycorrhizal fungi, and the plant-growth promoting rhizobacteria.
- Published
- 2019
43. Vehicular ad hoc networks (VANETS) : status, results, and challenges
- Author
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Sherali Zeadally, Aamir Hassan, Angela S.M. Irwin, Ray Hunt, Yuh-Shyan Chen, Zeadally, Sherali, Hunt, Ray, Chen, Yuh-Shyan, Irwin, Angela, and Hassan, Aamir
- Subjects
VANET ,Standardization ,Computer science ,Wireless ad hoc network ,networking ,protocols ,security ,broadcasting ,Computer security ,computer.software_genre ,Broadcasting (networking) ,media_common.cataloged_instance ,Electrical and Electronic Engineering ,European union ,Implementation ,media_common ,Vehicular ad hoc network ,business.industry ,Quality of service ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,simulation ,Software deployment ,routing ,standards ,Telecommunications ,business ,computer - Abstract
Recent advances in hardware, software, and communication technologies are enabling the design and implementation of a whole range of different types of networks that are being deployed in various environments. One such network that has received a lot of interest in the last couple of years is the Vehicular Ad-Hoc Network (VANET). VANET has become an active area of research, standardization, and development because it has tremendous potential to improve vehicle and road safety, traffic efficiency, and convenience as well as comfort to both drivers and passengers. Recent research efforts have placed a strong emphasis on novel VANET design architectures and implementations. A lot of VANET research work have focused on specific areas including routing, broadcasting, Quality of Service (QoS), and security. We survey some of the recent research results in these areas.We present a review of wireless access standards for VANETs, and describe some of the recent VANET trials and deployments in the US, Japan, and the European Union. In addition, we also briefly present some of the simulators currently available to VANET researchers for VANET simulations and we assess their benefits and limitations. Finally, we outline some of the VANET research challenges that still need to be addressed to enable the ubiquitous deployment and widespead adoption of scalable, reliable, robust, and secure VANET architectures, protocols, technologies, and services. Refereed/Peer-reviewed
- Published
- 2011
44. Association Of Serum Total Bilirubin Level With Diabetic Retinopathy In Type 2 Diabetes Mellitus.
- Author
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Ghaffar T, Marwat ZI, Ullah F, Khan S, and Hassan Aamir AU
- Subjects
- Bilirubin blood, Case-Control Studies, Female, Humans, Male, Middle Aged, Bilirubin administration & dosage, Diabetes Mellitus, Type 2 blood, Diabetic Retinopathy blood
- Abstract
Background: Serum bilirubin has anti-inflammatory, antioxidant and immunological properties. It is considered a protective substance against atherosclerotic and microvascular complications of diabetes mellitus (DM). This study was designed to find the association between total serum bilirubin concentration and diabetic retinopathy (DR)., Methods: This case control study was conducted in the Department of Endocrinology, Diabetes and Metabolic Diseases, Hayatabad Medical Complex, Peshawar. Type-2 DM patients more than 18 years of age of either gender with duration of T2DM more than 6 months were included and sub categorized in two groups. Cases (DM with DR) and Controls (DM without DR) while patients with acute and chronic liver diseases, haemolytic anaemia, history of chronic alcohol consumption, use of hepatotoxic drugs (anti-tuberculous, anti-epileptic), women on oral contraceptive pills were excluded. All participants underwent ophthalmic examination at diabetic retinopathy screening clinic followed by pre designed set of investigations., Results: A total of 152 patients, 76 cases and 76 controls were included. Serum bilirubin concentration was found inversely and independently (p 0.000) associated and inversely co related (r -0.345and p 0.000) with prevalence of DR. Cases were concentrated in the lower quartiles of serum bilirubin concentration and vice versa. Low haemoglobin (p 0.00) and longer duration of DM (0.003) were independently and directly associated with prevalence of DR., Conclusions: Serum bilirubin concentration is inversely and independently associated and inversely correlated with the prevalence of DR and may predict progression of DR over time.
- Published
- 2016
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