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Urbanization reduces resource use efficiency of phytoplankton community by altering the environment and decreasing biodiversity

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Journal of Environmental Sciences 2022年第2期34卷 140-151页

作者： Yigang Yang Huihuang Chen mamun abdullah al Jean Claude Ndayishimiye Jun R Yang alain Isabwe Anqi Luo Jun Yang Aquatic EcoHealth Group Fujian Key Laboratory of Watershed EcologyKey Laboratory of Urban Environment and HealthInstitute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China Engineering Research Center of Ecology and Agricultural Use of Wetland(Ministry of Education) College of AgricultureYangtze UniversityJingzhou 434025China

Urbanization often exerts multiple effects on aquatic and terrestrial organisms,including changes in biodiversity,species composition and ecosystem ***,the impacts of urbanization on river phytoplankton in subtropical urbanizing watersheds remain largely ***,we explored the effects of urbanization on phytoplankton community structure(i.e.,biomass,community composition and diversity)and function(i.e.,resource use efficiency)in a subtropical river at watershed scale in southeast China over 6 years.A total of 318 phytoplankton species belonging into 120 genera and 7 phyla were identified from 108 *** biomass showed an increasing trend with increasing urbanization *** phytoplankton community shifted from Chlorophyta dominance in rural upstream waters to Bacillariophyta dominance in urbanized downstream ***,phytoplankton diversity and resource use efficiency(RUE=phytoplankton biomass/total phosphorus)were significantly decreased with increasing urbanization level from upstream to *** RUE exhibited a significant positive correlation with species richness,but a negative correlation with phytoplankton *** variation in environmental factors(turbidity,total nitrogen,NH_(4)^(+)-N,total phosphorus,PO_(4)^(3-)-P and percentage urbanized area)was significantly correlated with phytoplankton diversity and ***,our results revealed the influence of urbanization on phytoplankton community structure and ecosystem function was due to its altering the environmental ***,human-driven urbanization may play crucial roles in shaping the structure and function of phytoplankton communities in subtropical rivers,and the mechanism of this process can provide important information for freshwater sustainable uses,watershed management and conservation.

关键词： Plankton Community functioning Subtropical river Urbanization gradient Land use Watershed ecology

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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

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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

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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

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Improved greenhouse cucumber production under deficit water and fertilization in Northern China

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International Journal of Agricultural and Biological Engineering 2018年第4期11卷 58-64页

作者： Shaikh abdullah al mamun Hossain Lixue Wang Haisheng Liu College of Water Conservancy Shenyang Agricultural UniversityShenyang 110866LiaoningChina Department of Agricultural Engineering Patuakhali Science and Technology UniversityDumkiPatuakhali 8602Bangladesh

The objective of this study was to investigate the effects of different water and fertilizer applications on biomass,yield and fruit physical quality of greenhouse cucumber under drip *** experiment was conducted at Water Conservancy Research Institute,Shenbei District,Shenyang,Northern China during February-July,*** treatments were used in randomized block design consisted of three levels of water field capacity(FC)and urea-potash(N-K)fertilizer combinations:W1(65%of FC),W_(2)(75%of FC),W3(85%of FC)and N_(1)-K_(1)(285-305 kg/hm^(2)),N2-K2(420-435 kg/hm^(2)),N_(3)-K_(3)(530-565 kg/hm^(2)).Local farmers’conventional application of water(100%)and fertilizer(NPK)was considered as check(CK)for *** obtained was analyzed(ANOVA)to check the significant effect of *** results revealed that,treatment W_(3)N_(2)K_(1) obtained highest cucumber yield of 129.99 t/hm^(2),while W_(1)N_(1)K_(1) recorded the lowest yield(113.29 t/hm^(2)),in which total amount of seasonal water applied ranges from 85.3 mm to 172.36 *** highest yield was obtained 0.5%greater than the CK yield(129.35 t/hm^(2)).The water and fertilizer application was significantly(pal *** was also revealed that,the highest green biomass accumulation(572.4 g/plant)and fruit diameter(27.92 mm)with treatment W_(3)N_(2)K_(1) have significant influence on improved *** conclusion,the improved cucumber yield indicated 15%deficit water tolerance,in which average seasonal yield response factor(Ky)was calculated as ***,the treatment W_(3)N_(2)K_(1) could successfully be used to minimize water and fertilizer application for improving greenhouse cucumber yield.

关键词： cucumber drip irrigation fertilizer greenhouse yield

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Automated Complex Fabric Faults Detection Using a Hybrid Method

Automated Complex Fabric Faults Detection Using a Hybrid Met...

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作者： abdullah-al-mamun 华南理工大学

学位级别：硕士

Fault detection or identification is highly important to fabric quality ***,faults are detected by human *** efficiency of this manual technique is low and the missed rate is high because of eye *** the best case,a quality control person cannot detect more than 60–70 % of the present *** this study a Hybrid technique is developed to identify complex faults of warp-knitted fabrics *** this system,we use smart cameras and a Human Machine Interface（HMI）*** hybrid detection or identification algorithm is comprised of numerous single techniques such as Gabor filter,PCNN,morphological filter,and another associated technique（Binarizing）those are running on the SOC processor of the smart camera for identifying distinctive types of complex faults on ***,Gabor filters are employed to enhance the contrast of images captured by a CMOS *** fault is not detected after Gabor filter it goes through ***,fault areas are segmented by PCNN with adaptive parameter ***,for making the PCNN output more clear and faults more obvious,the morphological filter has been used in this detection or identification ***,smart cameras will notice the controller to stop the warp-knitting machine once faults are found *** results demonstrate that the hybrid technique is superior to Gabor and PCNN techniques on fabric complex faults detection or identification *** this hybrid technique we get 97.08% fault detection or identification accuracy which is superior to Gabor and PCNN *** operations in a textile factory can be verified the effectiveness of the inspection system.

关键词：复杂织物故意诊断缺陷检测混合方法机器视觉

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Jaundice in pediatric visceral leishmaniasis (kala-azar) patients

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Asian Pacific Journal of Tropical Medicine 2009年第2期2卷 27-29页

作者： AKM mamunur Rashid Md.Asrafuzzaman abdullah al mamun abdullah al Mahboob Department of Paediatrics Khulna Medical CollegeKhulnaBangladesh Department of Microbiology Khulna Medical CollegeKhulnaBangladesh Department of Medicine Khulna Medical CollegeKhulnaBangladesh

Objective:Visceral leishmaniasis(Kala-azar) is endemic in many countries including *** presentation of visceral leishmaniasis in children and adult may vary and at time may simulate many tropical and hepatobiliary *** and ascites are not common in kala-azar ***:During the period of January 2005 to December 2006,all the records of the confirmed kala-azar patients presented with jaundice were included in this ***-azar was confirmed by serology test ICT(Immuno Chromatography) and Bone Marrow ***:Total 12 kala-azar patients were encountered during this *** these twelve cases,presenting features were jaundice(7),splenomegaly(12),hepatomegaly(11) and ascites (4).Initial clinical diagnosis of chronic liver disease(CLD) was made in(5),Congenital hemolytic anaemia in(1) and kala-azar in rest of the patients(6 ).Common leucopenia and relative lymphocytosis was not observed in any ***:Kala-azar may present with various clinical manifestation in children and *** can be considered to be a common manifestation particularly in pediatric kala-azar ***,it may mislead to another diagnosis if it is taken as a rare feature in kala-azar.

关键词： Jaundice Pediatric(kala-azar) Patients

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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

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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

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Kinetic adsorption of application of carbon nanotubes for Pb(Ⅱ) removal from aqueous solution

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Journal of Environmental Sciences 2009年第4期21卷 539-544页

作者： Nassereldeen A Kabbashi Muataz A Atieh abdullah al-mamun Mohamed E S Mirghami MD Z alam Noorahayu Yahya Bio-Environmental Research Unit Department of Biotechnology Engineering International Islamic University MalaysiaJalan Gombak 50728 Malaysia Nanoscience and Nanotechnology Group Department of Biotechnology Engineering International Islamic University MalaysiaJalan Gombak 507283 Malaysia Department of Chemical Engineering King Fahd University for Petroleum and MineralSaudi Arabia

The capability of carbon nanotubes （CNTs） to adsorb lead （Pb） in aqueous solution was investigated. Batch mode adsorption experiment was conducted to determine the effects of pH, agitation speed, CNTs dosage and contact time. The removal of Pb（II） reached maximum value 85% or 83% at pH 5 or 40 mg/L of CNTs, respectively. Higher correlation coefficients from Langmuir isotherm model indicates the strong adsorptions of Pb（II） on the surface of CNTs （adsorption capacity Xm = 102.04 mg/g）. The results indicates that the highest percentage removal of Pb （96.03%） can be achieved at pH 5, 40 mg/L of CNTs, contact time 80 min, and agitation speed 50 r/min.

关键词： lead removal carbon nanotubes kinetic modeling adsorption

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