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Search Results: 1 - 10 of 206 matches for " Lailun Nahar "
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Aggression in Boys and Girls as Related to Their Academic Achievement and Residential Background  [PDF]
Md Shahinoor Rahman, Lailun Nahar
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.45065

The study was conducted to explore aggression in boys and girls as related to their academic achievement and residential background in Bangladesh. Stratified random sampling technique was used and total 80 respondents constituted the sample of the study. They were equally divided into boys and girls. Each group was again equally divided into high and low grade. Each subgroup was again equally divided into urban and rural residential background. Thus the study used a 2 × 2 × 2 factorial design consisting of two levels of gender (boy/girl), two levels of academic achievement (high grade/low grade) and two levels of residential background (urban/rural). The Bengali version of measure of aggressive behavior (Rahman, A. K. M. R., 2003) originally developed by Buss and Perry (1992) was used for the collection of data. It was found that regardless of gender, boys expressed more aggression than girls. Similarly, regardless of academic achievement, students with high academic grade will show more aggressive behavior than low academic grade students. Finally, students of urban areas will not show significantly more aggressive behavior than rural areas students. Thus the differential treatment in gender, academic achievement and residential background provides a new dimension in understanding aggression in rural and urban boys and girls.

The Relationship of Job Satisfaction, Job Stress, Mental Health of Government and Non-Government Employees of Bangladesh  [PDF]
Lailun Nahar, Afroza Hossain, Abdur Rahman, Arunavo Bairagi
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.46074

The purpose of the present study was to investigate the relationship of job satisfaction, job stress and mental health on government and non-government employees. It was believed that there will have a significant difference between government and non-government employees in case of various job related factors. These factors affect job performance of employees. In this context it was important to know how job satisfaction, job stress and mental health differ in terms of types of jobs. Subjects in the study were 100 employees, 50 government and 50 non-government employees. Job Satisfaction Scale, Occupational Stress Index and General Health Questionnaire were used as data collection tools. Data were analyzed by using means, Pearson Product Moment Correlation and ANOVA test. The study found that there is a significant positive correlation between job stress and types of job (r = .282, P < .01). Significant job stress was found in case of non-government employees, because, they feel less job security and high work load. Significant negative correlation was found between job satisfaction and sex (r = ?.204, P < .05).Female employees were less satisfied than male employees with their lower level jobs having with a lower payment and as well as due to less social security.

Ionization of Metastable 2P-State Hydrogen Atoms by Electron Impact for Coplanar Asymmetric Geometry  [PDF]
S. Dhar, N. Nahar
Open Journal of Microphysics (OJM) , 2014, DOI: 10.4236/ojm.2014.44007
Abstract: The triple differential cross-sections of First Born approximation have been calculated for ionization of metastable 2P-state hydrogen atoms by electron impact in the asymmetric coplanar geometry. In this study a multiple scattering theory of ionization of hydrogen atoms is used. The latest results of the present method are compared with other calculations. It will be added for new experimental study of ionization of hydrogen atoms in their metastable states.
Influence of Biogeochemical Qualities of Shizuoka Water on the Degradation of PVC Shower Hose  [PDF]
Mst. Shamsun Nahar, Jing Zhang
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.22024
Abstract: Recently, it has been report of polyvinyl chloride (PVC) shower hoses becoming hard and brittle throughout the eastern and middle portion of Shizuoka Prefecture, Japan. No reason has been identified for this phenomenon. The affected cities are located at the paper industries area. We have collected the stiffed hoses attached to shower faucets and examined them for chemical changes. In addition, we have analyzed the water quality of 11 affected cities in Shizuoka in an attempt to establish a probable bio-physico-chemical chain reaction that could cause such hose degradation. According to elemental analysis, oxygen-containing carbon-based plasticizers may leach out of the hose. As a result, the hoses lost flexibility after one year of use in Shizuoka. The organic nutrient (1,4-dioxane) was identified by GC-MS and the utmost number of the heterotrophic bacteria has been detected by PCR-DGGE in the shower water of Shizuoka. The study concludes that the plasticizer disappeared from the stiffed hose and the special characteristics of water in Shizuoka, consisting of organic nutrients, can be used for heterotrophic bacterial growth as a energy source at the shower water temperature, which allows prompt utilization of the plasticizer by increasing abundant bacteria, causing the brittleness of the PVC hose.
Analysis of Damaged Silicon Rubber Hose  [PDF]
Mosammad Shamsun Nahar, Jing Zhang
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.23044
Abstract: Recently, there have been many reports of silicon rubber (SR) hoses becoming brittle in juice factory within one month of purchase. The damage is a new phenomenon, and its cause is unknown. We have collected the damaged hoses attached to UHT sterilizer (ultra-high-temperature) in juice factory and examined them for chemical changes. In addition, we have analyzed the hose-washing chemicals (NaOH and HNO333) and the exposure UTH temperature have direct effect on the brittleness of the silicon hose in juice factory.
InSAR Observation for the Surface Displacements at Mt. Etna between 2003 and 2007  [PDF]
Syeda Sabikun Nahar, Arif Mahmud
International Journal of Geosciences (IJG) , 2015, DOI: 10.4236/ijg.2015.62010
Abstract: This research is mainly devoted to InSAR observations using Poly-Interferogram Rate and Time-series Estimator (π-rate) software to investigate continuous surface displacement at Mt. Etna (Sicily), Italy between 2003 and 2007. Using ascending and descending SAR images produced by European Space Agency’s ENVISAT, we generate a set of interferograms which are used to determinethe deformation history of Etna from 2003 to 2007. Using (π-rate), we can generate the InSARtime-series and ratemap while minimizing errors induced by the satellites orbit and atmosphericphase delays. During the period of 2003-2007, three separate eruptions were observed. In order to explain the deformation, we solve three displacement rate for 2003-2005, 2006 and 2007. As expected, the result suggests that displacement rates are not constant with respect to time. During 2006 the volcano appeared to switch from a period of deflation to a period of inflation. These results highlight the importance of InSAR for generating deformation time-series around Mt.Etna, and with the application of numerical models these results can be used to estimate theamount of magma moving in the subsurface.
Evaluation of medical teachers and traditional teaching in Pharmacology
Shamsun Nahar
Bangladesh Journal of Pharmacology , 2006,
Sweet Sorghum: an Alternative Feedstock for Bioethanol
Kamrun Nahar
Iranica Journal of Energy and Environment (IJEE) , 2011,
Abstract: Sweet sorghum is a rising crop for energy and being considered due to its merits of substituting fossil fuel with the ethanol that is extracted from it. It overcomes many of the shortcomings of other biofuel/energy (food) crops. To produce ethanol only the stalks of sweet sorghum are being used while the grain is saved for food or livestock feed. Also the grain is not in high demand in the global food market, and thus has little impact on food prices and food security. Sweet sorghum is grown on already-farmed dry lands that are low in carbon storage capacity, so there are no concerns of clearing of rainforests. Sweet sorghum is easier and cheaper to grow than other biofuel crops and does not require much irrigation, so it is an important consideration in dry areas.
Establishment and Growth of Potato Micro-Cuttings in Sand Trays  [PDF]
Md. Jahangir Hossain, Mosammat Shamsun Nahar
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.39147
Abstract: Two separate experiments were conducted to evaluate the success of the establishment and growth of micro-cuttings of potato (5 - 6 cm tall) in sand trays [38 cm (L) × 28 cm (W) × 7.5 cm (H) plastic trays] under controlled environment (22?C ± 2?C, 60 - 75 μmosm–1?s–1 light energy for 16 h daily). In the first experiment, micro-cuttings of potato cv. Diamant were planted at six populations (500, 600, 700, 800, 900 and 1000 cuttings per tray) in treated sand (sun dry, 1% formaldehyde, 0.2% Dithane M-45 and control). The mortality percentage of micro-cuttings was nil for sun dry sand while formaldehyde and dithane M-45 treated sand had 1% - 4% against 15% in the control with the highest population density. Mortality of micro-cuttings in formaldehyde and dithane M-45 treated sand trays were found not to be related to pathogenic organism rather toxic effect of these two chemicals. Micro-cuttings in Sun dry and control treatments showed better growth performance than these in chemically treated sand trays. In the second experiment, urea @ 1, 2 and 3 g per tray was applied as solid form after 15 days of planting the micro-cuttings and as liquid form @ 0.5, 1 and 2% solution sprayed in the micro-cuttings repeatedly after 15, 30, 45 and 60 days of planting. The micro-cuttings which received urea as solid state died within 2 - 3 days and 2% urea solution was also detrimental. Urea solution @ 0.5% found to be very effective for vegetative growth of micro-cuttings in sand trays. The control was also good for vegetative growth but at a slower rate.
PAPR Reduction Based on Proposed Rotating Phase Shift Technique in MC-CDMA Using FPGA  [PDF]
Ali Kareem Nahar, Kamarul H. Bin Gazali
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2015, DOI: 10.4236/ijcns.2015.87025
Abstract: FPGA implementation used of Rotating phase shift (RPS) for peak-to-average power ratio (PAPR) reduction in Multi Carrier Code Division Multiple Access (MC-CDMA) signals. Because, MC-CDMA is still suffering from PAPR which is a major drawback in most of the multi carrier communication systems. In addition, the implementation of the system in an FPGA becomes more flexible and scalable. It eliminates the search for optimum phase factors from a given set, which manifests improved PAPR at reduced computational complexity as compared to conventional PTS and SLM. The amplitude of the signal is reduced by rotating each of the partially transmitted sequence anticlockwise by a π/2 degree and the peak power is reduced by circularly shifting the quadrature component of the partially transmitted sequence after phase rotation. A brief description of PTS, SLM is compared with the RPS, which best reduces PAPR from PTS and SLM. It is also presented that VHDL code of the RPS is designed by Xilinx ISE 14.1 implements of FPGA. The peak-to-average power ratio performance of the proposed method has been investigated.
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