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Advances in Materials Physics and Chemistry 2024年第10期14卷 235-247页

作者： md. Nasir Uddin md. abdullah al mamun md. Masudar Rahman Department of Mathematics Bangladesh Army University of Engineering & Technology Natore Bangladesh

The hybrid convective boundary layer circulation involving multiple nanofluids via a medium with pores is approaching a sloping plate. An investigation regarding the heat-generating effects upon the examined nanofluid flows has been carried out through computational analysis. A mathematical framework employing governing differential equations that are partial has been implemented to produce an ensemble of ordinary differential equations, which happen to be nonlinear that incorporate nanofluid flows by utilizing acceptable transformations. Through the combination of the Nachtsheim-Swigert shooting method and the Runge-Kutta method, the group of resulting non-dimensionalized equations is solved computationally. In a few special, confined cases, the corresponding numeric output is thereafter satisfactorily matched with the existing available research. The consequences of heat generation regarding local skin friction coefficient and rate of heat in conjunction with mass transfer have been investigated, evaluated, and reported on the basis of multiple nanofluid flows.

关键词： Heat-Generating Hybrid Convection Nanofluids Porous Medium Sloping Plate

Effect of Seeding Density on Mat-Type Seedling Quality for Mechanical Transplanting in Dry Season Rice

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Agricultural Sciences 2021年第11期12卷 1231-1243页

作者： Nilufar Yasmin Shaikh md. Ashraful alam Mohammad Kamruzzaman md. abdullah al mamun AKM Saiful Islam Biotechnology Division Bangladesh Rice Research Institute (BRRI) Gazipur Bangladesh Farm Machinery and Post-Harvest Technology Division Bangladesh Rice Research Institute (BRRI) Gazipur Bangladesh Agricultural Statistics Division Bangladesh Rice Research Institute (BRRI) Gazipur Bangladesh

Rice transplanting with a transplanter is a cost-effective process. Due to labor shortages during the peak time of rice transplanting, it is a promising technology in Bangladesh. However, the high-quality mat-type seedling is a prerequisite factor for mechanical transplanting. The experiments were conducted at three different locations (Gazipur, Tangail, and Rangpur) during the dry season (Boro)/2019-20 to determine the best seeding density for high-quality mat-type seedlings to be prepared for mechanical rice transplanters. The effects of seeding rate on seedling quality such as survival rate, seedling strength, stem thickness of newly released boro rice varieties BRRI dhan86, BRRI dhan89, and BRRI dhan92 were studied using four seeding rates (130, 140, 150, 160 g/tray). Results revealed that BRRI dhan92 showed quick seedling emergence compared to BRRI dhan89 and BRRI dhan86. Seedling mortality was found the lowest BRRI dhan92 while the highest in BRRI dhan86. 25 - 30 days old seedling was found suitable for mechanical transplanting in terms of seedling mortality. Seedling height increased with the increase in seed density. BRRI dhan92 showed the highest stem thickness followed by BRRI dhan89 and BRRI dhan86 with seed rate 150 - 160 g per tray. The suitable seeding rate (150 - 160 g/tray) for the studied varieties was found better for raising mat-type seedlings suitable for mechanical transplanting, which could coordinate the production of larger population growth and higher harvest index to achieve high grain yield.

关键词： Rice Seed Density Mortality Seedling Age Stem Thickness Seedling Strength

Effect of Planting Methods on the Yield and Yield Attributes of Short Duration <i>Aman</i>Rice

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American Journal of Plant Sciences 2014年第3期5卷 251-255页

作者： md. Masud Rana md. abdullah al mamun Afruz Zahan md. Nayeem Ahmed md. Abdul Jalil Mridha Adaptive Research Division Bangladesh Rice Research Institute Gazipur Bangladesh Agronomy Division Bangladesh Rice Research Institute Gazipur Bangladesh Soil Science Division Bangladesh Rice Research Institute Gazipur Bangladesh

To find out the effect of planting methods on the yield and yield attributes of short duration Aman rice varieties, a field trial was conducted at the farm of Bangladesh Rice Research Institute, Gazipur, during July to November 2012. The treatments comprised of three BRRI released high yielding varieties viz., BRRI dhan39, BRRI dhan49 and BRRI dhan57 and three planting methods viz., direct seeding of dry seed, direct seeding of sprouted seed and transplanting. It was a factorial experiment conducted in a Randomized Complete Block Design with three replications. Planting methods had a significant effect on the growth duration of rice. The rice crop established with direct seeding of the dry and sprouted seed matured 7 days earlier than transplanting. The variety BRRI dhan39 gave the highest yield (4.964 t·ha-1) when grown with direct seeding of sprouted seed compared to other varieties. The highest net return (23362.00 BDT ha-1) and cost benefit ratio (1:1.49) were observed in direct seeding of the sprouted seed method. So, direct seeding of sprouted seed might be the best planting method because about 19.94% production cost is reduced due to the omission of seedling raising and transplanting operations as well as the reduction in the length of the crop cultivation period.

关键词： Direct Seeding of Dry and Sprouted Seed Growth Duration Short Duration Aman Rice

Effect of Field Treatment on Microfloral Respiration and Storability of Canola under Different Storage Conditions

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American Journal of Plant Sciences 2019年第11期10卷 1989-2001页

作者： Fuji Jian Peian Tang md. abdullah al mamun Digvir S. Jayas Department of Biosystems Engineering University of Manitoba Winnipeg Canada College of Food Science and Engineering Nanjing University of Finance and Economics Nanjing China

Whether different field treatments such as straight cut, swathing, or pre-harvest aid application can influence the canola storage is the critical information for growers. The effect of these different field treatments on the infection and development of microflora on canola seeds with 9%, 11%, and 14% moisture content at 20°C, 25°C, 30°C and 35°C was determined. To evaluate the microfloral infection and development, concentration of CO2 and O2 in 150 g canola bulks were measured every 3 d. At the beginning and end of the study (66 d), the seed moisture content, germination, visible mold, invisible fungal infection, and yellow seed count were measured. The swathed and nature ripened canola had a slightly higher respiration rate at ≥30°C and ≥ 2 wk than the seeds with other field treatments. The swathed canola had a marginally lower initial germination and higher germination at 66 d. The Glyphosate treated and nature ripened canola seeds had a slightly higher chance of visible model development. However, all these differences were not significant at α = 0.05 level and different field treatments and storage conditions did not influence the yellow seed count.

关键词： Canola Pre-Harvest Treatment Pre-Harvest Aid Respiration Safe Storage

Prevalence and Associated Factors of Anemia among Pregnant Women Receiving Antenatal Care (ANC) at Fatima Hospital in Jashore, Bangladesh: A Cross-Sectional Study

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Food and Nutrition Sciences 2019年第9期10卷 1056-1071页

作者： Suzon Ahmed md. abdullah al mamun Niaz Mahmud Nisat Farzana Mosammat Sadia Akther Sathi Biplob Kumar Biswas Amit Datta Tanvir Ahmad Department of Nutrition and Food Technology Faculty of Applied Science and Technology Jashore University of Science and Technology Jashore Bangladesh

Since anemia is one of the most skyrocketed public health problems worldwide, an investigation has thus been conducted to assess the prevalence and associated factors of anemia among the pregnant women receiving antenatal care (ANC) at Fatima Hospital in Jashore, Bangladesh. Facility-based cross-sectional study was carried out among 384 pregnant women at Fatima hospital, Bangladesh from February to April, 2019. Data were obtained using a structured questionnaire and participant’s current medical record card. Binary logistic regression analysis was used to identify factors associated with anemia and a P-value ally significance. The overall prevalence of anemia among pregnant women was 58.9% (226/384). Out of 226 anemic pregnant mothers, 36.3% (82/226) were mildly anemic, 62.4% (141/226) were moderately anemic and 1.3% (3/384) was severely anemic. Binary logistic regression analysis revealed that the following variables were significantly associated with anemia: Monthly family income (11,000 - 20,000 Taka) [AOR (95% CI) = 0.45 (0.21 - 0.98)], Family size (joint) [AOR (95% CI) = 1.59 (1.03 - 2.45)], Gestational age (third trimester) [AOR (95% CI) = 2.18 (1.40 - 3.40)], birth spacing alence of anemia among pregnant women is severe at Fatima Hospital in Jashore, Bangladesh.

关键词： Anemia Antenatal Care (ANC) Socio-Demographic Characteristics Maternal Characteristics Dietary Characteristics Nutritional Characteristics

Regeneration mechanisms and therapeutic strategies for neuromuscular junctions in aging and diseases

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Neural Regeneration Research 2025年第1期20卷 193-194页

作者： Masashi Fujitani Abu md.mamun Tarif Yoshinori Otani Department of Anatomy and Neuroscience Faculty of MedicineShimane UniversityShimaneJapan

The neuromuscular junction(NMJ)is an essential synaptic structure composed of motor neurons,skeletal muscles,and glial cells that orchestrate the critical process of muscle contraction(Li et al.,2018).The typical NMJ structure is classically described as having a“pretzel-like”shape in mice(Figure 1),whereas human NMJs have a smaller,fragmented structure throughout *** NMJs exhibit smaller or fragmented endplates,partial denervation,reduced numbers of synaptic vesicles,abnormal presynaptic mitochondria,and dysfunctional perisynaptic Schwann cells(alhindi et al.,2022).

关键词： aging structure Figure

Status and prospects for symmetric organic redox flow batteries

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Journal of Energy Chemistry 2025年第1期100卷 125-143页

作者： md.al Raihan C.Adam Dyker Department of Chemistry University of New Brunswick

As environmental concerns from fossil fuel consumption intensify, large-scale energy storage becomes imperative for the integration of renewable sources like wind, hydro, and solar with the electrical *** flow batteries, particularly those employing organic molecules, are positioned as a key technology for this purpose. This review explores the growing field of symmetric organic redox flow batteries(ORFBs) within this context. Unlike traditional asymmetric designs based on unique active materials for each electrode, symmetric ORFBs involve a single bipolar species for both electrodes. This review highlights the benefits of a symmetric design, and categorizes five distinct classes of organic bipolar molecules used in both aqueous and non-aqueous solvents. By providing a comprehensive overview of their cell cycling and performance characteristics, the strengths and weaknesses of the diverse categories of bipolar molecules are highlighted for both solvent systems, as are opportunities for future development. This should guide new research directions and advance the development of practical symmetric ORFBs.

关键词： Redox flow battery Symmetric battery Organic battery Aqueous electrolyte Non-aqueous electrolyte

Toxic tau: structural origins of tau aggregation in alzheimer’s disease

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Neural Regeneration Research 2020年第8期15卷 1417-1420页

作者： abdullah al mamun md.Sahab Uddin Bijo Mathew Ghulam md.Ashraf Department of Pharmacy Southeast UniversityDhakaBangladesh Pharmakon Neuroscience Research Network DhakaBangladesh Division of Drug Design and Medicinal Chemistry Research Lab Department of Pharmaceutical ChemistryAhalia School of PharmacyPalakkadIndia King Fahd Medical Research Center King Abdulaziz UniversityJeddahSaudi Arabia Department of Medical Laboratory Technology Faculty of Applied Medical SciencesKing Abdulaziz UniversityJeddahSaudi Arabia

alzheimer’s disease is characterized by the extracellular accumulation of the amyloidβin the form of amyloid plaques and the intracellular deposition of the microtubule-associated protein tau in the form of neurofibrillary *** of the alzheimer’s drugs targeting amyloidβhave been failed in clinical ***,tau pathology connects greatly in the pathogenesis of alzheimer’s *** protein enhances the stabilization of microtubules that leads to the appropriate function of the *** in the quantity or the conformation of tau protein could affect its function as a microtubules stabilizer and some of the processes wherein it is *** molecular mechanisms leading to the accumulation of tau are principally signified by numerous posttranslational modifications that change its conformation and structural ***,aberrant phosphorylation,as well as truncation of tau protein,has come into focus as significant mechanisms that make tau protein in a pathological ***,the shape-shifting nature of tau advocates to comprehend the progression of alzheimer’s disease *** this review,we emphasize the recent studies about the toxic and shape-shifting nature of tau in the pathogenesis of alzheimer’s disease.

关键词： alzheimer’s disease neurofibrillary tangles shape-shifting nature of tau tau aggregation toxic tau

Analysis and modeling of hysteresis of piezoelectric micro-actuator used in high precision dual-stage servo system

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Control Theory and Technology 2015年第2期13卷 184-203页

作者： md.Arifur RAHMAN abdullah al mamun Kui YAO Department of Electrical and Computer Engineering National University of Singapore Institute of Materials Research and EngineeringA*STAR (Agency for Science Technology and Research)

A dual-stage servo system consists of a primary coarse actuator for facilitating large motion and a secondary micro-actuator for small but precise motion to improve tracking performance. Piezoelectric micro-actuator made from lead zirconate titanate(PZT)has been a popular choice for the secondary stage. However, the advantage gained by the resolution of the secondary PZT actuator is reduced by its inherent hysteresis nonlinearity. Model based hysteresis compensation techniques are preferred due to their simplicity and fast response. Identification and modeling are two substantial parts in such model-based techniques. This paper presents a rigorous analysis and modeling of the hysteresis of PZT micro-actuator. Modified Generalized Prandtl-Ishlinskii and Coleman-Hodgdon models are studied. Identification of the model through nonlinear least square and particle swarm optimization are examined and compared. Several analyses are done through tuning of the model parameters and identification *** analysis and simulation results underscore the effectiveness of this modeling approach. Finally as a design example,a dual-stage simulation analysis is done to show the effectiveness of systematic modeling on hysteresis compensation.

关键词： Hysteresis particle swarm optimization(PSO) modified generalized Prandtl-Ishlinskii(GPI) inverse GPI

Community ecology and spatial distribution of trees in a tropical wet evergreen forest in Kaptai national park in Chittagong Hill Tracts, Bangladesh

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Journal of Forestry Research 2014年第2期25卷 311-318页

作者： S. M. Feroz md.Rabiul alam Prokash Das abdullah al mamun Forestry and Wood Technology Discipline Khulna Universtity

We investigated the floristic composition, woody species diversity and spatial distribution of trees in a tropical wet evergreen forest in Kaptai national park in Chittagong Hill Tracks, Bangladesh. We recorded 25 families, 37 genera, 40 species and 1771 woody individuals in a 0.09 ha plot. Euphorbiaceae and Moraceae were the most species- rich families, and Castanopsis, Ficus and Terminaliawere the most species-rich genera. Bursera serrata Wall. ex Colebr. was the dominant species in terms of highest importance value （13%）. Trema orientalis （L.） B1 was typically a light demanding species as it appeared in the top can- opy with only one individual having the seventh highest IV, but had no regeneration. The expected maximum number of species （Smax） was 140, indicating that many species may invade the forest as the Sm~ is greater than the recorded total number of species. The nature of the disappear- ance and appearance of species in the present forest reflects instability of floristic composition. The values of Shannon＇s index H＇ and Pielou＇s index J＇（evenness） were 3.36 bit and 0.63, respectively. These values show moderately high species diversity as compared to other subtropical forests in the tropics. In addition, a sample area of 200 m2 in this forest would be sufficient for measuring the diversity indices H＂ and ,/＇, whereas the trend of J＇may indicate the rate of equality of individuals among the different species decreased with increasing area. The distribu- tion pattern for the total stand was completely random. However, the dominant species showed aggregate distribution for small areas, but random distribution for large areas. The spatial association between species showed that the strongest positive interspecific association occurred between Streblus asper Lour. and Castanea indica Roxh. （09 = 0.51）. As a whole, most species were weakly associated with each other, of which 58% species associations were completely negative. The result of cluster analysis s

关键词： Chittagong Hill Tracts floristic composition spatial distribution of trees tropical wet evergreen forest woody species diversity