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Search Results: 1 - 10 of 461344 matches for " A. Quadir "
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Simulation of High Impact Rainfall Events Over Southeastern Hilly Region of Bangladesh Using MM5 Model
M. N. Ahasan,M. A. M. Chowdhury,D. A. Quadir
International Journal of Atmospheric Sciences , 2013, DOI: 10.1155/2013/657108
Abstract: Simulation of high impact rainfall events over southeastern hilly region of Bangladesh has been carried out using Fifth-Generation PSU/NCAR Mesoscale Model (MM5) conducting two historical rainfall events, namely, 21 June, 2004 and 11 July, 2004. These extraordinary rainfall events were localized over the Rangamati region and recorded 304 mm and 337?mm rainfall on 21 June, 2004 and 11 July, 2004, respectively, over Rangamati within a span of 24?h. The model performance was evaluated by examining the different predicted and derived parameters. It is found that the seasonal monsoon trough has northerly position compared to normal and pass through Bangladesh extending up to northeast India for both cases. The heat low was found to be intense (996?hPa) with strong north-south pressure gradient (12–15?hPa). The analysis of the geopotential height field at 200?hPa shows that the Tibetan high is shifted towards south by 7-8° latitudes with axis along 22–25°N for both cases. The analysis of the wind field shows that the areas of high impact rainfall exhibit strong convergence of low level monsoon circulation ( 19–58?knots). The strong southwesterlies were found to exist up to 500?hPa level in both cases. The lower troposphere (925–500?hPa) was characterized by the strong vertical wind shear ( 9–18?ms?1) and high relative vorticity ( 20–40 × 10?5?s?1). The analysis also shows that the areas of high impact rainfall events and neighbourhoods are characterized by strong low level convergence and upper level divergence. The strong southwesterly flow causes transportation of large amount of moisture from the Bay of Bengal towards Bangladesh, especially over the areas of Rangamati and neighbourhoods. The high percentage of relative humidity extends up to the upper troposphere along a narrow vertical column. Model produced details structure of the spatial patterns of rainfall over Bangladesh reasonably well though there are some biases in the rainfall pattern. The model suggests that the highly localized high impact rainfall was the result of an interaction of the mesoscale severe convective processes with the large scale active monsoon system. 1. Introduction Rangamati (22.53°N, 92.20°E), the southeastern hilly city of Bangladesh (latitudes 20°34′–26°38′N and longitudes 88°01′–92°41′E), is situated on the western slopes of Mizo Hills and Arakan Mountains. Rangamati is very different in terms of topography from the rest of Bangladesh, as the city is built on the hilly regions. On 21 June, 2004 and 11 July, 2004, Rangamati received 304?mm and 337?mm rainfall within 24
Observing molecular hydrogen clouds and dark massive objects in galactic halos
F. De Paolis,G. Ingrosso,Ph. Jetzer,A. Quadir,M. Roncadelli
Physics , 1995,
Abstract: Molecular hydrogen clouds can contribute substantially to the galactic halo< dark matter and may lead to the birth of massive halo objects (MHOs) observed indirectly by microlensing. We present a method to detect these molecular clouds in the halo of M31 using the Doppler shift effect. We also consider the possibility to directly observe MHOs in the halo of M31 via their infrared emission.
Muhammed Monjurul Quadir
International Journal of Economics and Financial Issues , 2012,
Abstract: This article investigates the effects of macroeconomic variables of treasury bill interest rate and industrial production on stock returns on Dhaka Stock Exchange for the period between January 2000 and February 2007 on the basis of monthly time series data using Autoregressive Integrated Moving Average (ARIMA) model. The paper has taken the overall market stock returns as an independent variable. It does not consider the stock returns of different companies separately. Though the ARIMA model finds a positive relationship between Treasury bill interest rate and industrial production with market stock returns but the coefficients have turned out to be statistically insignificant.
Antibiotics and Micronutritional Blend to Enhance Fertility Potential in Male Having Abnormal Semen Parameters
Mosammat Rashida Begum, David Miller, M.A. Salam, Ehsan Quadir, Mosammat Sahina Begum, Farzana KhanZahid Hassan Bhuiyan
The Open Clinical Trials Journal , 2009, DOI: 10.2174/1876821000901010007]
Abstract: Objective: Objective of this study was to explore the effect of empirical antibiotics and micro nutritional blends in infertile men having idiopathic oligospermia, asthenospermia and oligoasthenospermia. Materials and Methods: This prospective cross sectional study was undertaken in a tertiary level infertility care unit of Dhaka between September 2005 and December 2007. Two hundred and seven oligo, astheno and oligoasthenospermic patients were the target population for this study. Thorough infertility evaluation was done to identify idiopathic oligo, astheno and oligoasthenospermia. Female partners were also evaluated to exclude bilateral tubal blockage, pelvic inflammatory diseases, endometriosis, uterine pathology and resistant PCOS. Male partners were divided into three groups for I) Antibiotics and micronutrients, II) only micronutrients and III) no intervention as control. Treatment was continued for three months. Semen analysis was repeated at the end of two and three months. Main outcome measures were improvement of semen parameters and pregnancy rate. Results: Before treatment all patients characteristics were comparable. After treatment there was significant improvement both in count and motility in groups I and II p <0.05. In group III where there was no intervention there was no improvement of semen parameters p >0.05. Six patients (8.70%) from group I and 12 patients (17.29%) from group II got pregnant within 6 months of observation. No one got pregnant from group III. Conclusion: Empirical use of antibiotics and micronutrients in idiopathic oligo, astheno and oligoasthenospemia can improve sperm quantity and quality and aid a couple in achieving pregnancy.
Financial Distress in Small and Medium Enterprises (SMES) of Bangladesh: Determinants and Remedial Measures
Mohammad Saleh JAHUR,S. M. Nasrul QUADIR
Economia : Seria Management , 2012,
Abstract: Financial distress in SMEs is a common phenomenon across the world, which has been a subject matter of academicians, professionals and government. Although SMEs are contributing to the economy in the form of employment, supply of products and services by using indigenous technologies, social entrepreneurship, income generating activities etc. SMEs are found most vulnerable to the macro-economic as well as internal management crises. Consequently, they fall into financial distress. In view of this, the present study has been undertaken aiming at identifying the causes of financial distress in SMEs of Bangladesh. The study has employed both financial and statistical techniques for analyzing the data collected for the study. The study has identified some potential problem areas related to financial distress such as rate adequacy, sales trends, indebtedness, management capability, financial planning, etc. The study has also identified some most important causes of financial distress such as fund management & resource crunch, poor accounting system, poor financial control, poor productivity and profitability and management succession. The study has finally come out some strategic and policy related measures for both viable and financially distressed SMEs for preventing them from the exposition to financial and operating risk.
Rural development scheme of Islami Bank Bangladesh Limited - A study on its growth, effectiveness and prospect in Bangladesh
Mohammad Saleh JAHUR,S. M. Nasrul QUADIR
Economia : Seria Management , 2010,
Abstract: Most of the people of Bangladesh are living under poverty line. To alleviate poverty, thousands of NGOs and GOs have been working since the inception of the Bangladesh. But the success rate of these programs appears to be insignificant. Rural Development Scheme (RDS) being a shariah and teaching of Islam based technique has been introduced in order to graduate the rural poor from poverty trap by bringing them in the main stream of economy by providing micro-credit and teaching for value creation. The present study has been undertaken aiming at evaluating the effectiveness of the program and its prospect. It has collected both primary and secondary data, and analyzed these with the help of both financial and statistical techniques. The findings of the study are: the growth performance of RDS in important parameters are robust across study period, and RDS influence the income and income generating activities of borrowing members significantly. Finally the study has put forward some logical suggestions for enhancing the sustainability as well as robustness of the program.
Comparison of esmolol and labetalol, in low doses, for attenuation of sympathomimetic response to laryngoscopy and intubation
Singh Sarvesh,Quadir Abdul,Malhotra Poonam
Saudi Journal of Anaesthesia , 2010,
Abstract: Objective: The present study compared the efficacy of esmolol and labetalol, in low doses, for attenuation of sympathomimetic response to laryngoscopy and intubation. Design: Prospective, randomized, placebo controlled, double-blinded study. Setting: Operation room. Patients and Methods: 75 ASA physical status I and II adult patients, aged 18-45 years undergoing elective surgical procedures, requiring general anesthesia and orotracheal intubation. Interventions: Patients were allocated to any of the three groups (25 each)-Group C (control)10 ml 0.9% saline i.v. Group E (esmolol) 0.5 mg/kg diluted with 0.9% saline to 10 ml i.v. Group L (labetalol) 0.25 mg/kg diluted with 0.9% saline to 10 ml i.v. In the control group 10 ml of 0.9% saline was given both at 2 and 5 min prior to intubation. In the esmolol group 0.5 mg/kg of esmolol (diluted with 0.9% saline to 10 ml) was given 2 min prior and 10 ml of 0.9% saline 5 min prior to intubation. In the labetalol group 10 ml of 0.9% saline was administered 2 min prior and 0.25 mg/kg of labetalol (diluted with 0.9% saline to 10 ml) 5 min prior to intubation. All the patients were subjected to the same standard anesthetic technique. Measurements: Heart rate (HR), systolic blood pressure (SBP) and diastolic blood pressure (DBP) were recorded prior to induction, at time of intubation and 1, 3, 5, and 10 min after intubation. Mean arterial pressure (MAP) and rate pressure product (RPP) were calculated. Abnormal ECG changes were also recorded. Results: Compared to placebo and esmolol (0.5 mg/kg), labetalol (0.25 mg/kg) significantly attenuated the rise in heart rate, systolic blood pressure, and RPP during laryngoscopy and intubation. However, the difference was not statistically significant among the values for DBP and MAP. Conclusion: In lower doses, labetalol (0.25 mg/kg) is a better agent than esmolol (0.5 mg/kg) in attenuating the sympathomimetic response to laryngoscopy and intubation.
Variability and Trends of Summer Monsoon Rainfall over Bangladesh
MN Ahasan,Md AM Chowdhary,DA Quadir
Journal of Hydrology and Meteorology , 2010, DOI: 10.3126/jhm.v7i1.5612
Abstract: In this paper, the updated rainfall data of 50 years (1961-2010) for 30 selected rain gauge stations of Bangladesh have been used. The data were analyzed to investigate the variability and trends of summer monsoon (June- September) rainfall over Bangladesh. The possible teleconnection of monsoon rainfall variability with ENSO has also been investigated. Annual profile of the station mean monthly rainfall of Bangladesh shows a unimodal pattern with high rainfall between June-September (monsoon season) with highest in July and low rainfall between December – February with lowest in January. All Bangladesh mean summer monsoon rainfall is 1769.14 mm, standard deviation 209.16 mm (coefficient of variance 11.82 %) and annual country average rainfall is 2456.38 mm. Summer monsoon rainfall widely varies over the geographical areas with lowest in central-western part and highest in southeastern part with next highest in northeastern part of the country. The trend analysis shows that the trend of the country average monsoon rainfall is decreasing (-0.53 mm/year). The spatial distribution of the trend values indicates that the summer monsoon rainfall exhibits increasing trends at the rate of 5-6 mm/year in the NW region and 3-4 mm/ year in the south-central and extreme SE region. The eastern region exhibits decreasing trends of about -2 to -7 mm/year with highest (-6 to -7 mm/year) in the east-central part. The time series plot of country average summer monsoon rainfall shows the inter-annual variability in the timescales of 2-3 years and 4-6 years. The time series of 5 year moving average reveals existence of low frequency variability of timescales of 9-14 years. The time series of Bangladesh monsoon rainfall shows that there were 11 strong monsoon years and 8 weak monsoon years within the periods of 1961-2010 (50 years). The analysis of the decadal mean rainfall shows that the decades 1961-1970 and 1981-1990 were wet and the decades 1971-1980, 1991-2000 and 2001-2010 were dry. Floods in Bangladesh result from the excess rainfall occurring both inside and outside the country. Summer monsoon rainfall is characterized by active and weak (break) spells, which are associated with the fluctuation of monsoon rainfall in the time scales of 20-25 and 40-50 days. Such fluctuations are caused due to north-south movement of the monsoon trough. The fluctuations in the time scales of 4-7 and 10-14 days are associated with the formation of low pressure systems over the head Bay. The possible atmospheric teleconnections of summer monsoon rainfall with ENSO have also been
Intracellular Serine Protease Inhibitor SERPINB4 Inhibits Granzyme M-Induced Cell Death
Pieter J. A. de Koning, J. Alain Kummer, Stefanie A. H. de Poot, Razi Quadir, Roel Broekhuizen, Anne F. McGettrick, Wayne J. Higgins, Bart Devreese, D. Margaret Worrall, Niels Bovenschen
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0022645
Abstract: Granzyme-mediated cell death is the major pathway for cytotoxic lymphocytes to kill virus-infected and tumor cells. In humans, five different granzymes (i.e. GrA, GrB, GrH, GrK, and GrM) are known that all induce cell death. Expression of intracellular serine protease inhibitors (serpins) is one of the mechanisms by which tumor cells evade cytotoxic lymphocyte-mediated killing. Intracellular expression of SERPINB9 by tumor cells renders them resistant to GrB-induced apoptosis. In contrast to GrB, however, no physiological intracellular inhibitors are known for the other four human granzymes. In the present study, we show that SERPINB4 formed a typical serpin-protease SDS-stable complex with both recombinant and native human GrM. Mutation of the P2-P1-P1′ triplet in the SERPINB4 reactive center loop completely abolished complex formation with GrM and N-terminal sequencing revealed that GrM cleaves SERPINB4 after P1-Leu. SERPINB4 inhibited GrM activity with a stoichiometry of inhibition of 1.6 and an apparent second order rate constant of 1.3×104 M?1s?1. SERPINB4 abolished cleavage of the macromolecular GrM substrates α-tubulin and nucleophosmin. Overexpression of SERPINB4 in tumor cells inhibited recombinant GrM-induced as well as NK cell-mediated cell death and this inhibition depended on the reactive center loop of the serpin. As SERPINB4 is highly expressed by squamous cell carcinomas, our results may represent a novel mechanism by which these tumor cells evade cytotoxic lymphocyte-induced GrM-mediated cell death.
An Analysis of Consumers Food Purchasing Attitudes and Habits in Relation to Food Safety
Didem Onay,Seher Ersoy-Quadir,Mehmet Akman
Pakistan Journal of Nutrition , 2011,
Abstract: Through the recent developments in food industry, natural and synthetic additive substances are being used in food production to increase the quality and taste of food, to prolong their shelf life and to decrease costs. Despite their many benefits, these applications can sometimes cause allergy, chronic or acute food poisonings, deaths and labor force loss. Therefore, it is crucial that consumers perceive risks stemming from food and learn how to manage them when purchasing and thereby decide whether the food is safe or not. The aim of this study is to examine consumers attitudes pertaining to food safety when buying food and their habits of taking precautions against this matter. The sample of the study was composed of 546 civil servants and teachers residing in the city center of Konya. It was found out that the subjects in the sample group had correct habits in terms of paying attention to food safety but their attitudes in this issue were inadequate. Teachers were found to be more sensitive to the risks stemming from the food additives than civil servants (p<0.01). As for the attitudes to precautions taken in food purchase, teachers were found to be less careless (p<0.05). Contrary to our expectations, it was found out that those with lower educational levels were found to display more conscious consumer attitudes (p<0.05). In terms of habits, women were seen to observe the precautions to be taken when purchasing food more carefully compared to men (p<0.001). Younger consumers were found to pay more attention to the precautions mentioned than older ones (p<0.05).
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