Browsing by Author "Uddin, Md. Nazim"

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Design, Simulation and Feasibility Analysis of a Solar Rooftop PV System for Academic Building 4 of Daffodil International University
(Daffodil International University, 2021-06) Habib, A.S.M. Shahriar; Uddin, Md. Nazim
Electricity is a vital element of the economic development of a country and quality of living. The energy sector of Bangladesh is entirely dependent on natural gas. However, natural gas reserves are depleting. As a result, it is essential to reduce reliance on natural gas. Besides, burning fossil fuels is one of the primary sources of the greenhouse effect and climate change. Solar power is the most viable option for reducing dependency on gas and reducing greenhouse gas emissions as this is clean energy. Every day, Daffodil International University uses a lot of energy. Almost all of the electricity is supplied from the national grid. So, a feasible solar project will aid in the reduction of grid supply. The architecture, simulation, and feasibility study of a solar project are presented in this article. The most critical step in creating a solar project model is calculating the load at various times of the year, measuring the rooftop and its productive location. These data have been measured at the beginning. The average load for full and reduced load is 9737.57 kWh/day and 3037.3 kWh/day, respectively. The project's effective area is 1845 𝑚2 which was measured practically. PVSYST was used to determine the number of solar panels and the highest capacity. Besides, different losses are also mentioned in this section. The solar panels have a maximum capacity of 298 kW to generate electricity. To visually reflect the project, Sketchup Pro is used. In this thesis, HOMER is the leading simulation software here. Two simulations are performed. One is for the whole building's loads, and the other is for the classroom, washroom, and corridor loads. The cost of energy is BDT 8.95 for full load and BDT 8.12 for the reduced load. So, when the load is reduced, the cost also decreases. So, reduced load results in a much feasible system.
Impact analysis of sewing Defects in garments industry & their remedies
(Daffodil International University, 2018-04-12) Uddin, Md. Nazim; Akter, Sonia
Sewing method is one in all the foremost vital stages aborning intensive ready-made vesture enterprises. Quality faults occurring throughout this method adversely have an effect on the merchandise quality and merchandiser potency, and additionally increase the assembly value. The aim of this study is to research whether or not the article of clothing production method is management in check |in restraint} during a article of clothing production enterprise and to discover the processes with highest rates stitching of stitching} faults in sewing department and eventually to create suggestions for rising the standard control. Among the applied math method management methods; management list, product management chart were employed in the study. “Product management chart” was accustomed check whether or not the assembly method is controlled within the enterprise. moreover, the applied math ways were utilized to work out the problems that require to be wiped out the advance efforts and to discover the relations between the method teams purportedly effective on faults occurring in article of clothing production and also the quantity of faults. Also, the processes with highest amounts of stitching faults and also the effects of those processes on fault rates were investigated. As a result, it absolutely was all over that the assembly method was statistically not in restraint within the ready-made vesture enterprise. additionally, this study incontestable that the investigation of every method cluster by drawing their product management charts would build vital contributions to foresee the results and prepare simpler the advance plans.
Investigation of the Electrochemical Behavior of Catechol in Presence of Glycine, Aspartic acid and Glutamic acid
(Khulna University of Engineering & Technology (KUET), Khulna, Bangladesh, 2016-07) Uddin, Md. Nazim; Motin, Prof. Dr. Md. Abdul
To monitor the electrochemical behavior of Catechol in presence of Glycine, L-Aspartic acid and L-Glutamic acid; cyclic voltammetry (CV), differential pulse voltammetry (DPV), controlled potential coulometry (CPC) and chronoamperometry (CA) techniques have been employed. A wide range of concentration (10mM to 150mM) of nucleophiles (Glycine, L-Aspartic acid and L-Glutamic acid), various pH media (5 to11), different electrodes ((Glassy carbon (GC), Gold (Au) and Platinum (P)) and successive scan rate (0.05 V/s to 0.5 V/s) have been used to find out the favorable condition. Catechol is an electroactive substance which shows a pair of redox peak whereas Glycine, L-Aspartic acid and L-Glutamic acid are electroinactive, hence it shows no anodic and cathodic peak in the potential range (-0.6 to 0.9 V) of investigation. By the addition of above nucleophiles in Catechol solution arises a new peak at lower potential, the corresponding redox peak shifts and peak current intensity of Catechol decreases with respect to the pure Catechol that indicates the participation of 1,4-Michael addition reaction of o-benzoquinone with mentioned nucleophiles. The formation of adducts from the reaction of Catechol with Glycine, L-Aspartic acid and L-Glutamic acid are assumed to be 2-((3,4-dihydroxyphenyl)amino)acetic acid, 2-((3,4-dihydroxy phenyl)amino)succinic acid and 2-((3,4-dihydroxyphenyl)amino)pentanedioic acid severally that go through electron transfer at more negative potentials than the Catechol. The influence of pH of Catechol in presence of Glycine, L-Aspartic acid and L-Glutamic acid has been studied by varying pH from 5 to 11. It is seen that at pH 3, 5, 9 and 11 no new anodic peak appears after repetitive cycling. In the neutral media (pH 7), the o-benzoquinone undergoes nucleophilic attack by the above nucleophiles that voltammetric new anodic peak A0 appears after repetitive cycling. The slopes of the peak potential was determined graphically from Ep vs pH plot as the anodic peaks of Catecholglycine adducts (27 mV/pH) proceeded via one step 2e−/2H+ process, Catechol-aspartic acid adducts (50 mV/pH) and Catechol-glutamic acid adducts (69 mV/pH) via two step 1e−/1H+ process. The reaction is strongly influenced by the different pH media as well as various compositions of nucleophiles. These reactions have been carried out wide range of concentration of nucleophiles. The optimum conditions for the formation of adducts such as Catechol-glycine (pH-7, Concentration 70 mM, GC electrode and Scan rate 0.1 V/s), Catechol-aspartic acid (pH-7, Concentration 70 mM, GC electrode and Scan rate 0.1 V/s) and Catechol-glutamic acid (pH-7, Concentration 30 mM, GC electrode and Scan rate 0.1 V/s) system are observed. The effect of scan rates has been investigated on cyclic voltammogram of Catechol in presence of above nucleophile. The anodic and cathodic peak current increases proportionally with increasing square root of scan rates. This linear relationship indicates the reaction is controlled by diffusion process. The current function, Ip/v1/2 decreases exponentially with increases scan rate which determine the reaction is controlled by ECE mechanism. The electro-synthesized adducts generated from the controlled potential coulometry of Catechol with Glycine, L-Aspartic acid and L-Glutamic acid was isolated and the generated adducts supported by FTIR spectra.
Investigation of the Pharmacological Properties of Lepidagathis hyalina Nees through Experimental Approaches
(https://www.mdpi.com/journal/life, 2021-02-25) Fahad, Fowzul Islam; Barua, Niloy; Islam, Md. Shafiqul; Sayem *, Al Jawad; Barua, Koushik; Uddin, Mohammad Jamir; Uddin, Md. Nazim; Adnan, Md.; Islam, Mohammad Nazmul; Sayeed, Mohammed Aktar; Emran, Talha Bin; Gandara, Jesus Simal; Ester Pagano 5; Rafandfaele Capasso 6
Lepidagathis hyalina Nees is used locally in Ayurvedic medicine to treat coughs and cardiovascular diseases. This study explored its pharmacological potential through in vivo and in vitro approaches for the metabolites extracted (methanolic) from the stems of L. hyalina. A qualitative phytochemical analysis revealed the presence of numerous secondary metabolites. The methanol extract of L. hyalina stems (MELHS) showed a strong antioxidative activity in the 1,1-diphenyl-2- picrylhydrazyl (DPPH) and reducing power assays, and in the quantitative (phenolic and flavonoid) assay. Clot lysis and brine shrimp lethality bioassays were applied to investigate the thrombolytic and cytotoxic activities, respectively. MELHS exhibited an expressive percentage of clot lysis (33.98%) with a moderately toxic (115.11 g/mL) effect. The in vivo anxiolytic activity was studied by an elevated plus maze test, whereas the antidepressant activity was examined by a tail suspension test and forced swimming test. During the anxiolytic evaluation, MELHS exhibited a significant dosedependent reduction of anxiety, in which the 400 mg/kg dose of the extract showed 78.77 4.42% time spent in the open arm in the elevated plus maze test. In addition, MELHS demonstrated dosedependent and significant activities in the tail suspension test and forced swimming test, whereas the 400 mg/kg dose of the extract showed 87.67 6.40% and 83.33 6.39% inhibition of immobile time, respectively. Therefore, the current study suggests that L. hyalina could be a potential source of anti-oxidative, cytotoxic, thrombolytic, anxiolytic, and antidepressant agents. Further study is needed to determine the mechanism behind the bioactivities.
Mitigating Soft Error Risks through Protecting Critical Variables and Blocks
(Khulna University of Engineering & Technology (KUET), Khulna, Bangladesh., 2012-04) Uddin, Md. Nazim; Sadi, Dr. Muhammad Sheikh
Soft error is a significant reliability concern for nanometer technologies. Shrinking feature sizes, lower voltage levels, reduced noise margins, and increased clock frequency improves the performance and lowers the power consumption of integrated circuit. But it causes the integrated circuit more susceptible to soft error that can corrupt data and make systems Vulnerable. The =device shrinking ‘reduces the soft error tolerance of the VLSI circuits, as very little energy is needed to change their states. In digital systems, where the reliability is a great concern, the impact of soft errors may be very catastrophic. Safety critical systems are very sensitive to soft errors. A bit flip due to soft error can change the value of critical Variable. And consequently the system control flow can completely be changed which may lead to system failure. To minimize the soft error risks, critical blocks are identified by criticality analysis of the blocks and ranking among them. Highest ranked blocks are considered as critical block. Refactoring is applied to minimize the criticality of the critical blocks. Then a novel methodology is proposed to detect and recover from soft errors considering only preceding variables and critical blocks rather than considering all Variables and blocks in the whole program. The proposed method has less time overhead in comparison to existing dominant approach.