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Search Results: 1 - 10 of 16236 matches for " Mohammad Tariqur Rahman "
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Tamarind Seed Extract Enhances Epidermal Wound Healing
Mohd Yusof bin Mohamad,Haris B Akram,Dinie Najwa Bero,Mohammad Tariqur Rahman
International Journal of Biology , 2011, DOI: 10.5539/ijb.v4n1p81
Abstract: Traditional healing power of tamarind fruits and the established antioxidant activity of the seeds drive the present study. Wound healing efficiency of tamarind seed was evaluated. Different solvents: phosphate buffer saline (PBS), water, methanol and ethanol were used to prepare the extract. Circular wound was inflicted on the nape. 10 μl of 5 μg/ml of extract was applied topically twice daily. Wound area was measured using Adobe Photoshop C3 Extended version and the percentage of wound reduction was calculated. PBS extract treatment induced complete wound healing in shortest period (10 days) while water extract, methanol extract and Solcoseryl ointment treatment induced complete wound healing in 11 days and control groups without any treatment took 14 days to heal. Phytochemical screening and Bradford method for protein quantification reveals the presence of alkaloid, saponin and tannin in all samples except PBS extract which tested negative to tannin. Flavonoid tested positive in methanol and ethanol extracts.
Capital Market of Bangladesh: Volatility in the Dhaka Stock Exchange (DSE) and Role of Regulators
Md. Tariqur Rahman,Khondker Golam Moazzem
International Journal of Business and Management , 2011, DOI: 10.5539/ijbm.v6n7p86
Abstract: Over the last few years, the capital market of Bangladesh has witnessed a haughty growth which is not in line of development in the real sector of the economy. Although, the Securities and Exchange Commission (SEC) of Bangladesh has tried to correct the irregular behavior observed in the market, very often it is argued that lack of proper and firm decisions from the regulator’s side has contributed to make the market more unstable rather than to reduce it. The paper attempts to identify the casual relationship between the observed volatility in the country’s major bourses namely the Dhaka Stock Exchange (DSE) and the regulatory decisions taken by the SEC empirically. Using Vector Auto-regressive (VAR), statistically highly significant relationship was found between decisions taken by the regulatory authority and market volatility, although the direction of causality is in reverse order than theoretically and empirically expected. Again, though the number of decisions taken by the SEC immediately, with longer time the response was in opposite direction than expected.
Status of Selective Emitters for p-Type c-Si Solar Cells  [PDF]
Mohammad Ziaur Rahman
Optics and Photonics Journal (OPJ) , 2012, DOI: 10.4236/opj.2012.22018
Abstract: Crystalline silicon (c-Si) solar cells have the lion share in world PV market. Solar cells made from crystalline silicon have lower conversion efficiency, hence optimization of each process steps are very important. Achieving low-cost photovoltaic energy in the coming years will depend on the development of third-generation solar cells. Given the trend towards these Si materials, the most promising selective emitter methods are identified to date. Current industrial monocrystalline Cz Si solar cells based on screen-printing technology for contact formation and homogeneous emitter have an efficiency potential of around 18.4%. Limitations at the rear side by the fully covering Al-BSF can be changed by selective emitter designs allowing a decoupling and separate optimization of the metallised and non-metallised areas. Several selective emitter concepts that are already in industrial mass production or close to it are presented, and their specialties and status concerning cell performance are demonstrated. Key issues that are considered here are the cost-effectiveness, added complexity, additional benefits, reliability and efficiency potential of each selective emitter tech- niques.
Media and education play a tremendous role in mounting AIDS awareness among married couples in Bangladesh
Mohammad Rahman, Mohammad Rahman
AIDS Research and Therapy , 2007, DOI: 10.1186/1742-6405-4-10
Abstract: The findings of both techniques show that education, occupation, socioeconomic status, status of household food consumption, area of residence and media exposure have significant (p < 0.001) contribution in determining HIV/AIDS awareness level. It also reveals that media, particularly TV, and education play the leading role regarding this issue while the others have an indirect relationship. The odds of awareness among higher educated women and men were 4.69 and 77.73 times of no educated women and men respectively. In addition, both women and men those who regularly watch TV were 8.6 times more likely to be aware about AIDS compared to those who never watch TV. This phenomenon holds true for both women and men.At this instant it is urgent to give emphasis on education, alleviation of poverty, ensuring electronic media exposure, head to head communication program, institutional based sex education and necessary information to learn about HIV/AIDS for the young, adult and adolescents all over the country.Acquired immunodeficiency syndrome (AIDS) is an infectious disease caused by human immunodeficiency virus (HIV) has created a major global health crisis and its impact on a country is tremendous [1-3]. The world has already experienced the overwhelming downbeat impact of HIV/AIDS epidemic on the development of severely affected countries [2,3]. Bangladesh is still considered as a low HIV/AIDS prevalent country but it is at a critical moment in the course of its AIDS epidemic [1,4-8]. According to UNAIDS estimates, Bangladesh, with a population of 136 million, had about 13,000 people living with HIV/AIDS at the end of 2001 and that HIV prevalence in the adult population is less than 0.01% [9]. Although overall HIV prevalence is low, Bangladesh is considered a high-risk country for several reasons: the presence of covert multi-partner sexual activity and denial, the low level of knowledge and low condom use, unsafe professional blood donation, high incidence of self-re
Pairwise comparisons in the analysis of carcinogenicity data  [PDF]
Mohammad A. Rahman, Ram C. Tiwari
Health (Health) , 2012, DOI: 10.4236/health.2012.410139
Abstract: Analysis of carcinogenicity data generally involves a trend test across all dose groups and a pairwise comparison of the high dose group with the control. The most commonly used test for a positive trend is the Cochran-Armitage test. This test is asymptotically normal. For the pairwise comparison of the high dose group with the control group, we propose two modifications: the first modification is to apply the test on the data from high dose and control groups after dropping the data from the low and the medium dose groups; the second modification is to adjust the test conditional on data from all dose groups. We compare the power performance of these two modifications for the pairwise comparisons.
Retraction:Modeling Electrical Characteristics of a pn-Junction Silicon Solar Cell Using PSpice  [PDF]
Mohammad Ziaur Rahman, Shahidul Islam Khan
Smart Grid and Renewable Energy (SGRE) , 2012, DOI: 10.4236/sgre.2012.32019
Abstract: Short Retraction Notice

The article has been retracted due to the investigation of complaints received against it. The substantial portions of the text came from Luis Casta?er and Santigo Silvestre, \" Modelling photovoltaic systems using PSpice\".The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in Vol.3 No.2 133-138, 2012, has been removed from this site.

Design and Analysis of a Compact Band Notch UWB Antenna for Body Area Network  [PDF]
H. M. Arifur Rahman, Mohammad Monirujjaman Khan
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2018, DOI: 10.4236/jemaa.2018.109012
Abstract: This paper presents the design of a small printed ultra wideband antenna with Band Notched characteristics. Both the free space and on-body performances of this antenna were investigated through simulation. The newly designed UWB antenna is more revised small form factor sized, with the ability to avoid interference caused by WLAN (5.15 - 5.825 GHz) and WiMAX (5.25 - 5.85 GHz) systems with a band notch. The return loss response, gain, radiation pattern on free space of the antenna were investigated. After that, the on-body performances were tested on 3-layer human body model with radiation pattern, gain, return loss, and efficiency at 3.5, 5.7, 8, 10 GHz and all the results were compared with free space results. As the on-body performance was very good, the proposed antenna will be suitable to be used for multi-purpose medical applications and sports performance monitoring.
Environmentally Harmful Low Density Waste Plastic Conversion into Kerosene Grade Fuel  [PDF]
Moinuddin Sarker, Mohammad Mamunor Rashid, Muhammad Sadikur Rahman, Mohammad Molla
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.38083
Abstract: Plastics wastes from a municipal solid waste (MSW) plant have a high-energy content and are suitable for fuel generation. Thermal cracking is one of the possible ways to obtain petrochemical feedstock from polymer wastes. Municipal waste plastic of LDPE conversion to kerosene grade fuel experiments were carried out under atmospheric conditions at temperatures between 150℃ and 420℃. Low density polyethylene (LDPE) plastic waste (Code #2) was thermally depolymerized in batch process into stainless steel reactor without adding catalyst. The maximum kerosene grade fuel yield is 30%, other grade fuel 60%, light gas 6% and left over residue 4%. The composition, sulphur and Btu value of liquid products were determined by ASTM method. Produced fuel was analyzed by Gas Chromatography and Mass Spectrometer and FT-IR. Very high conversions from LDPE waste plastic to kerosene grade fuel (up to 35%) were obtained while using this technique. Detailed product analyses and characterization lead to a reasonable explanation of reaction pathways and mechanisms.
Bitter Melon (Momordica Charantia) Reduces Serum Sialic Acid in Type2 Diabetics: Evidence to Delay the Process of Atherosclerosis  [PDF]
Inayat Ur Rahman, Mohammad Bashir, Mohammad Salman, Mohammad Idrees, Mohammad Iqbal Khan
Chinese Medicine (CM) , 2011, DOI: 10.4236/cm.2011.24021
Abstract: More than 1000 herbal products have been used by diverse cultures of the world to treat hyperglycemia and among them bitter melon (Momordica charantia) is one of the most popular herbal resource. The beneficial effects of bitter melon is not limited to hypoglycaemia only, but it also ameliorates diet induced obesity, insulin resistance and exhibit cardioprotective effects. The present study attempts to investigate the effect of bitter melon fruit juice on a newly investigated risk factor, sialic acid in type2 diabetics. A total of 40 type2 diabetic patients, divided into group A (n = 20) and group B (n = 20) were investigated during the present study. The patients of group A were following bitter melon fruit juice treatment along with diet control, whereas the patients of group B were on diet control only. Serum sialic acid (SSA) decreased in group A from 66.20 ± 2.30 mg/dl to 63.50 ± 2.10 mg/dl (<0.11) but, increased in group B from 66.50 ± 1.70 mg/dl to 68.20 ± 2.50 mg/dl (<0.12), compared to baseline. Post-treatment between group comparison revealed a significant difference (<0.05). The beneficial effects on fasting plasma glucose (FPG) and glycohemoglobin (HbA1-c) were also greater in group A compared to group B as was the case with blood lipids, weight and blood pressure. The study provides another mechanism for the cardioprotective effect of bitter melon and further strengthens its value in the management of type2 diabetes.
An Empirical Study on the Relationship between Foreign Investment and International Trade in Bangladesh
Mohammad Zillur Rahman
International Journal of Financial Research , 2011, DOI: 10.5430/ijfr.v2n2p33
Abstract: Bangladesh is home to large unskilled and semi-skilled population and lacks adequate domestic employment opportunity due to scarcity of foreign direct investment (FDI) which may foster its economic growth. And this country has also been experiencing significant increase in international trade in recent years compared with the scenario of last decade. In this backdrop, the author aims at empirically searching whether these FDI and international trade bolster or hinder growth of each other or not. Taking Bangladesh data of imports, exports and FDI covering the period between 1972-2007, the test for cointegration could not reject the hypothesis of no cointegration (r<0) among the variables in question and the paper only found foreign direct investment to have granger caused import but similar causality in any other direction was not found.
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