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Three Dimensional Separation with Spiral-Focus in a Decelerating Duct Flow (Effect of Asymmetric Inlet Boundary Layer Thickness)

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Journal of Thermal Science 2003年第1期12卷 27-32页

作者： Yoichi Kinoue Toshiaki Setoguchi Kenji Kaneko mamun mohammad Masahiro Inoue Department of Mechanical Engineering Saga University 1Department of Mechanical Engineering Saga University 1Department of Mechanical Engineering Saga University 1Department of Mechanical Engineering Saga University 1Department Honjo Saga 840-8502 Japan Honjo Saga 840-8502 Japan Honjo Saga 840-8502 Japan Honjo Saga 840-8502 Japanof Mechanical Engineering Science Kyushu University 6-10-1Hakozaki Higashi-ku Fukuoka 812-8581Japan

An experimental apparatus was developed to study the three dimensional separated flow with spiral-foci. The internal decelerating flow was generated by the air suction from a side wall to produce the separation on an opposite-side wall. The relation between the upstream boundary layer and the generation of spiral-foci in the separation region was observed by a tuft method. As a result, it was clarified that the spiral-focus type separation could be produced on the side wall and its behavior was closely related to the vortices supplied into the separation region from the boundary layer developing along top wall or bottom one.

关键词： three dimensional separation spiral-focus decelerating duct flow.

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

Investigating ionic liquids for optimizing lithium metal anode

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Green Energy & Environment 2022年第2期7卷 173-175页

作者： Lei Zhang mohammad Al-mamun Centre for Clean Environment and Energy Griffith UniversityGold Coast CampusGold CoastQLD 4222Australia

Developing renewable energy technology is an effective way to address the global warming and air pollution problems derived from depleting fossil *** to the high theoretical capacity(3860 m Ah g-1) and low electrochemical potential of lithium metal anode,lithium metal batteries(LMBs) have attracted tremendous research attention with the scalable application and vigorous deployment of electric ***,the further commercialization of Li metal anode is hindered by the random growth of Li dendrites during the lithium plating/stripping processes,leading to the continuous consumption of active Li and the puncture on the *** recently,Ma’s group proposed a new approach to systematically investigate the relationship between functional groups and Li dendrite generation during the Li plating/stripping *** proposed new approach could be of an effective tool to gain new insights into functional groups in the electrolyte additives and Li dendrites formation,highly valuable for the rational structural design of highperformance Li metal electrode materials.

关键词： lithium stripping electrolyte

Sources and Ecological Risks of Heavy Metals in Soils Under Different Land Uses in Bangladesh

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Pedosphere 2019年第5期29卷 665-675页

作者： mohammad Saiful ISLAM mohammad Kawser AHMED mohammad Habibullah AL-mamun Shah mohammad Asraful ISLAM Department of Soil Science Patuakhali Science and Technology UniversityDumkiPatuakhali 8602 (Bangladesh) Environment and Information Sciences Yokohama National UniversityYokohama 240-8501 (Japan) Department of Oceanography University of DhakaDhaka 1000 (Bangladesh) Department of Fisheries University of DhakaDhaka 1000 (Bangladesh) Department of Plant Pathology Patuakhali Science and Technology UniversityDumkiPatuakhali 8602 (Bangladesh)

Soil heavy metal pollution, influenced by both natural and anthropogenic factors, significantly reduces environmental quality. In this study, Cr, Ni, Cu, As, Cd, and Pb in eight different land-use soils from Patuakhali District in Bangladesh were assessed. Concentrations of Cr, Ni, Cu, As, Cd, and Pb in soils were 1-87, 5-271, 4-181, 0-80, 0.2-24.0, and 5-276 mg kg-1, respectively, measured using an inductively coupled plasma-mass spectrometer. The enrichment factor, pollution load index (PLI), and contamination factor (CJ) of metal i were used to assess the ecological risk posed by metals in soils. The PLI ranged from 0.78 to 2.66, indicating baseline levels to progressive deterioration of soil due to metal contamination. However, C;of Cd ranged from 1.8 to 12.0, which showed that the studied soils were strongly impacted by Cd. Considering the severity of the potential ecological risk of a single metal, the descending order was Cd > As > Pb > Cu > Ni > Cr. Soils under all land uses showed moderate to very high potential ecological risk.

关键词： Cd contamination factor degree of contamination enrichment factor environmental quality pollution load index soil deterioration soil pollution

Chloride ingress and macro-cell corrosion of steel in concrete made with recycled brick aggregate

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Frontiers of Structural and Civil Engineering 2021年第6期15卷 1358-1371页

作者： Tarek Uddin MOHAMMED Mahfuzur RAHMAN Ahmed SABBIR mohammad Mehedi HASAN Abdullah Al mamun Department of Civil and Environmental Engineering Islamic University of TechnologyBoard BazarGazipur 1704Bangladesh Department of Civil Engineering University of Information Technology and SciencesBaridharaDhaka 1202Bangladesh Bangladesh Road Research Laboratory Roads and Highways DepartmentMirpurDhaka 1216Bangladesh

An investigation on chloride ingress and macro-cell corrosion of steel bars in concrete made with recycled brick aggregate(RBA)was carried *** control cases,virgin brick aggregate(BA)and stone aggregate(SA)were also *** cylindrical and cracked prism specimens were studied for 16 different *** prism specimens were made with a segmented steel bar providing electrical connection from outside of the specimens to measure macro-cell corrosion current continuously under seawater splash exposure for a period of 30 d using a data *** specimens were submerged in 3%NaCl solution at a temperature of 40℃ to investigate chloride ingress in concrete made with RBA,BA,and SA after 120 and 180 ***-cell potential,corrosion area,and depths of corrosion were also *** chloride ingress as well as corrosion of steel bars in concrete made with the different types of aggregate is ordered as RBA>BA>SA.

关键词： brick aggregate chloride ingress macro-cell corrosion recycled brick aggregate

HBsAg, HBcAg, and combined HBsAg/HBcAg-based therapeutic vaccines in treating chronic hepatitis B virus infection

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Hepatobiliary & Pancreatic Diseases International 2013年第4期12卷 363-369页

作者： Sheikh mohammad Fazle Akbar mamun Al-Mahtab mohammad Helal Uddin Md. Sakirul Islam Khan Department of Medical Sciences Toshiba General HospitalTokyo Japan Department of Hepatology Bangabandhu Sheikh Mujib Medical UniversityDhaka Bangladesh Clinical Research Organization Dhaka Bangladesh Laboratory of Animal Production Faculty of Agriculture Ehime UniversityMatsuyama Japan

BACKGROUND: As the host immunity is diminished in patients with chronic hepatitis B (CHB), different approaches have been used to up-regulate their immune responses to produce therapeutic effects. But, cytokines, growth factors and polyclonal immune modulators could not exhibit sufficient therapeutic effects in these patients. Immune therapy with HBV-related antigens (vaccine therapy) has been used in CHB patients. But there is a paucity of information about the design of HBV antigen-based immune therapy in these patients. DATA SOURCE: Preclinical and clinical studies on immune therapy with HBsAg-based vaccine, HBcAg and combination of HBsAg/HBcAg-based vaccines have been discussed. RESULTS: HBsAg-based prophylactic vaccine was used as an immune therapeutic agent in CHB patients; however, monotherapy with HBsAg-based immune therapy could not lead to sustained control of HBV replication and/or liver damages. HBsAg-based vaccine was used as a combination therapy with cytokines, growth factors, and antiviral drugs. HBsAg-based vaccine was also used for cell-based therapy. However, satisfactory therapeutic effects of HBsAg-based vaccine could not be documented in CHB patients. In the mean time, evidences have supported that HBcAg-specific immunity is endowed with antiviral and liver protecting capacities in CHB patients. Recent data concentrate on the clinical use of combined HBsAg- and HBcAg-based vaccines in CHB ***: Antigen-based immune therapy with HBV- related antigens may be an alternative method for the treatment of CHB patients but proper designs of antigens, types of adjuvants, dose of vaccinations, and routes of administration need further analyses for the development of an effective regimen of immune therapy against HBV.

关键词： chronic hepatitis B HBsAg vaccine HBsAg/HBcAg vaccine immune therapy therapeutic vaccines

A compact transmit/receive switch for 2.4 GHz reader-less active RFID tag transceiver

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Journal of Central South University 2015年第2期22卷 546-551页

作者： mohammad Arif Sobhan Bhuiyan mamun Bin Ibne Reaz Jubayer Jalil Labonnah Farzana Rahman Tae Gyu Chang Department of Electrical Electronic and Systems Engineering Universiti Kebangsaan Malaysia43600 UKM Bangi Selangor Malaysia School of Electrical and Electronics Engineering Chung-Ang University

Radio frequency identification(RFID) is a ubiquitous identification technology nowadays. An on-chip high-performance transmit/receive(T/R) switch is designed and simulated in 0.13-μm CMOS technology for reader-less RFID tag. The switch utilizes only the transistor width and length(W/L) optimization, proper gate bias resistor and resistive body floating technique and therefore,exhibits 1 d B insertion loss, 31.5 d B isolation and 29.2 d Bm 1-d B compression point(P1d B). Moreover, the switch dissipates only786.7 n W power for 1.8/0 V control voltages and is capable of switching in 794 fs. Above all, as there is no inductor or capacitor used in the circuit, the size of the switch is 0.00208 mm2 only. This switch will be appropriate for reader-less RFID tag transceiver front-end as well as other wireless transceivers operated at 2.4 GHz band.

关键词： body floating CMOS radio frequency identification(RFID) transmit/receive(T/R) switch transceiver

Enhanced Thermochemical H_2 Production on Ca-Doped Lanthanum Manganite Perovskites Through Optimizing the Dopant Level and Re-oxidation Temperature

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Acta Metallurgica Sinica(English Letters) 2018年第4期31卷 431-439页

作者： Lulu Wang mohammad Al-mamun Porun Liu Yu Lin Zhong Yun Wang Hua Gui Yang Huijun Zhao Centre for Clean Environment and Energy Gold Coast Campus Griffith University Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and EngineeringEast China University of Science and Technology Centre for Environmental and Energy Nanomaterials Institute of Solid State Physics Chinese Academy of Sciences

Perovskite material is one of the promising classes of redox catalysts for hydrogen production through two-step ther-mochemical H20 ***,an analogue of La1-xCaxMnO3 perovskite was systematically investigated as a catalyst for thermochemical H2 *** Ca doping level（x = 0.2,0.4,0.6,0.8）and re-oxidation temperature were com-prehensively optimized for the improvement of catalytic *** to our experimental results,La0.6-Ca0.4MnO3 perovskite displayed the highest yield of H2 at the re-oxidation temperature of 900℃ and the obtained H2 production was -10 times higher than that of the benchmark ceria catalyst under the same experimental *** importantly,Lao.6Ca0.4MnO3 perovskite catalyst exhibited impressive cyclic stability in repetitive O2 and H2 test.

关键词： Thermochemical water splitting Hydrogen production Perovskite oxides Dopant level Re-oxidationtemperature

Ecosystem services assessment using a valuation framework for the Bangladesh Sundarbans: livelihood contribution and degradation analysis

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Journal of Forestry Research 2017年第1期28卷 1-13页

作者： M.M.Abdullah-Al-mamun Kazi mohammad Masum A.H.M.Raihan Sarker Asyraf Mansor Institute of Forestry and Environmental Sciences Chittagong University Department of Forestry and Environmental Science Shahjalal University of Science and Technology School of Biological Sciences Universiti Sains Malaysia

The ecosystem services provided by the Bangladesh Sundarbans contribute in various sectors especially to the livelihood of the surrounding peoples, but they are often overlooked in the valuation process. This study investigates the significance of ecosystem services on peoples＇ lives and how these services are affected by climate change and other factors. Here an economic valuation framework was used to list the ecosystem services provided by this mangrove forest. Direct uses included timber, gol- pata （Nypa fruticans）, honey, beeswax, fish, shrimp larvae and tourism. Indirect uses included carbon storage, protection from cyclones and tidal surges, breeding and nursery grounds for the aquatic species, and biodiversity conservation. This work also found that the ecosystem services were diminished by fresh water flow reduction, overharvesting, sea level rise, salinity increase, poaching, and climate change. In the present context and future scenario, sea level rise will be an important contributor to changes in ecosystem services. But because many factors impact sea level rise, the impact of climate change takes on less importance than many other causes of ecosystem service degradation in the Bangladesh Sundarbans.

关键词： Climate change Bangladesh Sundarbans Ecosystem service Life and livelihood - Mangrove