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Search Results: 1 - 10 of 25775 matches for " Umar Ali Khan "
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Wideband Monopole Antenna for WLAN Applications
Muhammad Umar,Nabeel Hayat Khan,Usman Ali
International Journal of Technology and Research , 2013,
Abstract: This paper presents a circular patch antenna for WLAN applications with wideband characteristics. It is shown that impedance of the antenna is matched over wideband by using the partial ground plane and quarter wave transformer with slotted TX-Line. Ansoft HFSS is used for simulation tool to map the numerical results for the return loss frequency behavior of antenna. Measure of bandwidth, return loss and radiation pattern are also reported with satisfactory performance. As the patch is circular in shape so substrate is kept in the same shape. The shape of the substrate is also discussed in details for specific antenna designs.
Assessment of Forest Growing Stock of Timergara Forest Subdivision, Dir Lower Forest Division  [PDF]
Majid Ullah, Amjad Ali Khan, Aamir Saleem, Sajjad Saeed, Umar Wahab
Open Journal of Ecology (OJE) , 2015, DOI: 10.4236/oje.2015.511044
Abstract: The present study was aimed to assess the growing stock of Timergara forest subdivision which was a part of Dir lower forest division (Pakistan). The study area was divided into two different climatic zones (i.e. sub-tropical sub humid and sub-humid temperate zones) on the basis of altitudinal considerations. A total of 43 sample plots are taken in the forest area of 8480 hectare with random sampling technique representing 0.5% of the total forest area. Each sample plot size was of one hectare. In each 100 × 100 m (1 ha plot), number of trees, diameter, age, height, increment, form factor and volume were measured. An interrelation between the diameter (independent variable) and all the other dependent variables (volume, increment and height) were found. At the end, volume tables were made which suited the local conditions as the ones used before were not suited to the local conditions.
Changes in Serum Lipid Profile among Patients Suffering from Chronic Liver Disease Secondary to Hepatitis C  [PDF]
Fakhar Ali Qazi Arisar, Shameem Behram Khan, Anam Umar, Noor ul Saba Shaikh, Fizza Choudhry
Open Journal of Gastroenterology (OJGas) , 2016, DOI: 10.4236/ojgas.2016.611036
Abstract: Objective: To find out the changes in lipid metabolism among patients suffering from chronic liver disease secondary to hepatitis C. Study Design: Hospital based observational study. Setting: Medical Unit-I, Ward–5, Jinnah Postgraduate Medical Centre, Karachi. Duration: July 2013 to December 2013. Patients and Methods: About 110 patients admitted in Medical Unit-I with a diagnosis of chronic liver disease were included in the study. Patients suffering from DM, HTN, CKD were excluded from the study. Fasting lipid profile was done in all cases. Results and Observations: There were 44 (40%) male and 66 (60%) female patients. Mean age of the patients was 50.18 (±11.7) years. Total cholesterol was decreased in 76 (69.09%) patients. Normal range was present in 34 (30.91%) patients. None of the patient had hypercholesterolemia. Serum triglyceride levels were low in 14 (12.72%) patients, normal in 82 (74.54%), borderline high in 7 (6.36%) and hypertriglyceridemia was seen in 7 (6.36%). HDL-c was below normal in 26 (23.63%) cases, normal in 78 (70.91%), and high in 6 (5.45%). LDL was near optimal/above optimal in only 5 (4.5%) patients. Mean TC/HDL ratio was 2.53 (±1.02). Mean LDL/HDL ratio was 1.23 (±0.73). Mean TC of HCV +ve patients was 130.5 mg/dl as compared to that of HCV –ve patients which was 82.85 mg/dl (P-value: 0.011). Mean TGs of HCV +ve group was 151.5 mg/dl while that of HCV –ve was 79.9 mg/dl (P-value: 0.025). Mean HDL & LDL levels were 43.67 mg/dl and 39.78 mg/dl in HCV group while 34.83 mg/dl & 64.67 mg/dl in the other group with P-value of 0.026 and 0.081 respectively. Conclusion: When it comes to its relationship with lipid metabolism, HCV is a remarkable virus. Its interaction with lipoproteins and its ability to induce massive steatosis are quite unique and idiosyncratic. Despite of causing hepatic steatosis, chronic HCV infection is associated with a paradoxically favorable lipid profile, although its reason cannot be enlightened precisely. There is a need for very well settled molecular and genetic studies to well understand HCV infection and lipid metabolism.
Selection of optimal heat sink dimensions using evolutionary strategies: A case study
Umar Khan,Liaquat Ali Khan,Syed Zahid Hussein
Journal of Engineering and Applied Sciences , 2008,
Abstract: The ever rising transistor densities and switching speeds in microprocessors have been accompanied a dramatic increase in the system heat flux and power dissipation. In this context the rising IC densities combined with even more stringent performance and reliability requirement have made thermal management issues ever more prominent in the design of sophisticated microelectronic systems. In order to achieve a higher degree of power dissipation extruded heat sinks have been a standard for many years. The objective of this paper is to use an evolutionary optimization method for the determination of the optimal heat sink dimensions, such that the optimized dimensions are within realistic manufacturing constraints and the heat dissipation capability is maximized.
Perception of Community about the Role of Sports in Social Training of Youth
Mohammad Younis Khan,Asif Jamil,Umar Ali Khan,Uzma Karim
International Journal of Academic Research in Business and Social Sciences , 2012,
Abstract: A research study was conducted to examine the perception of community about role of sports in social training of youth. The community comprised of Parents, Teachers, Students and Alumni. A structured questionnaire on three point Likert scale was developed and utilized for collection of data from 426 respondents selected through stratified sampling and random sampling technique in D.I.Khan Division of Pakistan’s during the year 2011. The result of the study indicated majority of community members have a very significant knowledge of the role of sports in social training of youth.
Perspectives of Teachers and Students about Internal and External evaluation system at Postgraduate level
Mohammad Younis Khan,Asif Jamil,Umar Ali Khan,Uzma Kareem
International Journal of Academic Research in Business and Social Sciences , 2012,
Abstract: A research study was conducted to know the opinion of teachers and students about internal and external system of examination in Universities at postgraduate level. A structured questionnaire on three point Likert scale was developed and utilized for collection of data from 500 respondents selected through random sampling techniques in Gomal University Dera Ismail Khan Khyber Pakhtunkhwa, Pakistan. The opinion of the teachers and students were known and investigated. The result of the study indicated that teachers are in favour of internal system of examination while students support the external system of examination at postgraduate level.
Female Students Opinion about Women’s Participation in Sports
Mohammad Younis Khan,Asif Jamil,Umar Ali Khan,Uzma Kareem
International Journal of Academic Research in Business and Social Sciences , 2012,
Abstract: A research study was conducted to know about the participation of Muslim girls and women in sports and philosophy of Islam in this regard. The population of this study was all female students of Government Girls Degree Colleges of District Dera Ismail Khan. Total 100 respondents selected from within the population through convenient or available sampling technique. For the purpose of collection of data a structured questionnaire on three point Likert scale, ranging from disagree (DA= 1 point) to agree (3 points), was prepared and handed over to 100 respondents with the help of female lecturers in physical education of concerned colleges. The main objective of the study was to know about the participation of Muslim girls and women in sports and philosophy of Islam in this regard. The result of the study indicated that Muslim women like sports and she wants to participate in sports for overall development but their ethnicity, culture, physical and spiritual challenges, parents, family members, and society members discourage them to participate in sports. The result of the study further confirmed that Islam encourages the women to participate in sports for good health, fitness and healthy life style after observing the Islamic dress code.
Hepatic encephalopathy in chronic liver disease; predisposing factors in a developing country
Fakhar Ali Qazi Arisar, Shameem Behram Khan, Anam Umar
Asian Journal of Medical Sciences , 2015, DOI: 10.3126/ajms.v6i2.11099
Abstract: Objective: To find out the risk factors for developing Hepatic Encephalopathy in patients suffering from Chronic liver disease. Background: Hepatic encephalopathy (HE) is a neuropsychiatric disorder that is caused by liver damage.? In its pathology, alterations in normal brain function are associated with an increase in blood ammonia, benzodiazepine like substances, products of neurotoxic fatty acids, and other gut derived toxins, which gain access to the brain as a result of liver dysfunction. ? Study Design : Hospital based descriptive, cross sectional study. ? Setting: Medical Unit 1, Ward- 5, Jinnah Post Graduate Medical Centre, Karachi. Duration:? July 2013 to December 2013 Patients and Methods: About 150 patients admitted in medical unit 1 with a diagnosis of chronic liver disease in a state of hepatic encephalopathy were included in this study. Patients suffering from viral or bacterial encephalitis, stroke, brain tumor, Wernicke’s encephalopathy were excluded from the study. Results and Observations: There were 96 (64%) female and 54 (36%) were male patients. Mean age of the patients was 52.45 (±12.271) years. 80 (53.33%) patients were having constipation. Infection was found in 55 (36.66%) cases. Upper GI Bleed was present in 51 (34%) patients. 44 (29.33%) patients had moderate to severe electrolyte imbalance as the cause. Constipation alone was the cause in 11.33% of cases. More than one factor was found to be responsible in around 56% of patients while in 6.6% of cases none of these precipitating factors was isolated. Conclusion: Constipation is the commonest cause of hepatic encephalopathy followed by infection, upper GI bleed and electrolyte imbalance. DOI: http://dx.doi.org/10.3126/ajms.v6i2.11099 Asian Journal of Medical Sciences Vol.6(2) 2015 36-43
HBV Perinatal Transmission
Muhammad Umar,Hamama-tul-Bushra,Shifa Umar,Haider Ali Khan
International Journal of Hepatology , 2013, DOI: 10.1155/2013/875791
Abstract: Hepatitis B is a serious public health problem all around the world. It is a blood-borne and sexually transmitted DNA virus in adults, but mother to child transmission of hepatitis B virus also occurs in infants born to hepatitis B surface antigen positive mothers. 1. Epidemiology About 350 million individuals have chronic HBV infection worldwide, and half of them acquired the infection either through perinatal route or in early childhood [1, 2], the latter being mostly asymptomatic, frequently goes unrecognized, yet 30–90% of them will develop chronic infection, which will not be diagnosed until adulthood [3–7]. 2. Modes of HBV Transmission in Infants and Children The modes of HBV transmission at an early age are (i) perinatal transmission, (ii) vertical transmission from an infected mother to her infant, or (iii) horizontal transmission from an infected household contact to the child [8]. 3. Risk Factors for Mother to Child Transmission (MTCT) The presence of HBeAg in serum is an indicator of viral replication. It is often used as a marker of ability to spread the virus to other people. HBeAg can filter through the placenta and can infect the fetus. Mother to child transmission rate is about 70–90% for HBeAg-positive mothers, 25% for HBeAg-negative/HBeAb-negative mothers, and 12% for HBeAg-negative/anti-HBe-positive mothers [9–13]. While there is only 6.6% transient infection in infants born to HBeAg-positive mothers, no persistent infection has been documented. High level of HBV DNA is the main risk factor for perinatal transmission in pregnant women. HBV can infect the placental tissue and vascular endothelium. HBV DNA is also present in sperms of HBV-infected males, and homology between the father and child’s viral sequences has been found [12, 14]. HBV can infect the follicular fluid and ovary, and studies have suggested that high levels of maternal HBV DNA enhance HBV transmission to embryos. Nie et al. demonstrated HBV replication in 50% embryos from mothers with HBV viremia versus 7% in mothers with undetectable levels of HBV DNA [15–17]. As regards the HBV genotype, some Japanese studies showed association between genotype C and MTCT when compared with other genotypes which were refuted by some later Chinese studies. Similarly the role of precore mutant (HBeAg-negative) and basal core mutation is also not very well documented in MTCT. Therefore, no conclusive evidence can be drawn regarding association of HBV genotypes (A, B, C, and D) and perinatal transmission [16–19]. 4. Routes for Mother to Child Transmission (MTCT) Intrauterine
An Appraisal of Spatial Distribution of Solid Waste Disposal Sites in Kano Metropolis, Nigeria  [PDF]
Ali Ibrahim Naibbi, Umar Musa Umar
Journal of Geoscience and Environment Protection (GEP) , 2017, DOI: 10.4236/gep.2017.511003
Abstract: This paper describes a research project that has been conducted as part of the Kano Municipal waste management strategy. The aim is to quantify and to identify the existing locations of waste disposal sites by mapping their spatial distribution within the metropolitan Kano. QUICKBIRD satellite imageries; locations of existing waste disposal sites collected using Global Positioning System (GPS); and topographical map (1:5000 scale) of Kano metropolis were used to generate data for the study. The data were prepared and analysed using ArcMap 10.2.1 and Erdas Imagine 11 software to produce the spatial distribution maps for solid waste disposal sites within the metropolis. The result shows that out of the 300 existing waste disposal sites assessed, the city has fairly well-distributed waste disposal sites. Conversely, the disposal sites are more clustered in the centre of the metropolis than the outskirts. However, about 80 percent of the sites are either located very close to roads, settlements or water bodies. Also, while about 92 percent of the existing waste disposal locations are open space, only about 7 percent are containers (closed dumping sites). Correspondingly, about 89 percent are authorised dumping sites and only about 11 percent are unauthorised illegal. The study recommends that policymakers should intervene and relocate the existing unauthorized dump sites to more suitable areas.
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