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Advances in reduction of NO_x and N_2O emission formation in an oxy-fired fluidized bed boiler

Chinese Journal of Chemical Engineering 2019年第2期27卷 426-443页

作者： Khalid El Sheikh mohammad jakir hossain khan Mahar Diana Hamid Siddhartha Shrestha Brahim Si Ali G.A.Ryabov Lya A.Dolgushin Mohd Azlan Hussain Tatiana V.Bukharkina Elena A.Gorelova Dmitry Mendeleev University of Chemical Technology of Russia Department of Chemical Engineering Faculty of Engineering University of Malaya Laboratory for Simulation and Modelling of Particulate Systems Department of Chemical Engineering Monash University All-Russian Thermal Engineering Institute VTI

Fossil fuel combustion is one of the major means to meet the mounting global energy demand. However, the increasing NO_x and N_2 O emissions arising from fossil fuel combustion process have hazardous effects. Thus, mitigating these gases is vital to attain a sustainable environment. Interestingly, oxy-fuel combustion in fluidized bed for carbon capture and minimized NO_x emissions is strongly sustainable compare to the other approaches. It was assessed that NO_x formation and fuel-N conversion have significant limitation under oxy-fluidized bed compared to air mode and the mechanism of NO_x formation is still deficient and requires further development. In addition, this review paper discussed the potential of primary measure as low emission process with others supplementary techniques for feasible NO_x reduction. The influences of combustion mode, operating parameters, and reduction techniques such as flue gas recirculation, oxygen staging, biomass co-firing, catalyst, influence of fluidized bed design and structure, decoupling combustion and their merges are respectively evaluated. Findings show that significant minimization of NO_x emission can be achieved through combination of primary and secondary reduction techniques.

关键词： Oxy-fuel combustion Fluidized bed technology Biomass blend Primary/secondary measures NOx emission

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Molecular identification of oomycete species affecting aquaculture in Bangladesh

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Aquaculture and Fisheries 2019年第3期4卷 105-113页

作者： mohammad Nasif Sarowar Md jakir hossain Tahmina Nasrin Tania Naznin Zakir hossain mohammad Matiur Rahman Department of Fisheries Biology and Genetics Bangladesh Agricultural UniversityMymensingh-2202Bangladesh Department of Animal Science and Aquaculture Faculty of AgricultureDalhousie UniversityAgriculture campusTruroNova Scotia B2N 5E3Canada

Fish mycotic disease outbreaks occur due to infections with oomycete pathogens such as Saprolegnia *** Aphanomyces invadans,and cause large-scale fish production *** its negative impact on aquaculture,little is known about the diversity of oomycete *** aim of this study was to identify the diversity of pathogenic oomycetes causing infections in major aquaculture zones of Mymensingh and Jessore regions in Bangladesh.A total of 449 water and infected fish samples were collected from 28 fish farms in both regions of which 29 samples were able to grow out with mycelia on the Potato Dextrose Agar(PDA)/Glucose Peptone Yeast Agar(GPYA)*** database searches using the rRNA Internal Transcribed Spacer(ITS)region revealed that 15 belonged to Pythium spp.,12 were Aphanomyces invadans and two corresponded to Saprolegnia *** isolates of Pythium *** identified to the species level:one was closely related to Pythium catenulatum,four to Pythium rhizo-oryzae,rest were identified up to *** Pythium *** only isolated from water samples whereas *** and *** were found in fish *** analysis revealed that a single *** clone exists in the sampled *** results obtained confirm the existence of pathogenic oomycetes in Bangladesh fish farms and this will pave future research on diversity,prevention and control measures.

关键词： Oomycete Saprolegnia Aphanomyces invadans Internal transcribed spacer(ITS) Phylogeny

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A Synergistic Multi-Attribute Decision-Making Method for Educational Institutions Evaluation Using Similarity Measures of Possibility Pythagorean Fuzzy Hypersoft Sets

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 501-530页

作者： Khuram Ali khan Saba Mubeen Ishfaq Atiqe Ur Rahman Salwa El-Morsy Department of Mathematics University of SargodhaSargodha40100Pakistan Department of Mathematics University of Management and TechnologyLahore54000Pakistan Department of Mathematics College of ScienceQassim UniversityBuraydah51452Saudi Arabia

Due to the numerous variables to take into account as well as the inherent ambiguity and uncertainty,evaluating educational institutions can be *** concept of a possibility Pythagorean fuzzy hypersoft set(pPyFHSS)is more flexible in this regard than other theoretical fuzzy set-like models,even though some attempts have been made in the literature to address such *** study investigates the elementary notions of pPyFHSS including its set-theoretic operations union,intersection,complement,OR-and *** results related to these operations are also modified for ***,the similarity measures between pPyFHSSs are formulated with the assistance of numerical examples and ***,an intelligent decision-assisted mechanism is developed with the proposal of a robust algorithm based on similarity measures for solving multi-attribute decision-making(MADM)problems.A case study that helps the decision-makers assess the best educational institution is discussed to validate the suggested *** algorithmic results are compared with the most pertinent model to evaluate the adaptability of pPyFHSS,as it generalizes the classical possibility fuzzy set-like theoretical ***,while considering significant evaluating factors,the flexibility of pPyFHSS is observed through structural comparison.

关键词： Hypersoft set Pythagorean fuzzy hypersoft set computational complexity multi-attribute decision-making optimization similarity measures uncertainty

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Comparative Design and Study of A 60 GHz Antenna for Body-Centric Wireless Communications

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Computer Systems Science & Engineering 2021年第4期37卷 19-32页

作者： Kaisarul Islam Tabia hossain mohammad Monirujjaman khan Mehedi Masud Roobaea Alroobaea Department of Electrical and Computer Engineering North South UniversityBashundharaDhaka-1229Bangladesh Department of Computer Science College of Computers and Information TechnologyTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia

In this paper performance of three different designs of a 60 GHz highgain antenna for body-centric communication has been evaluated. The basic structure of the antenna is a slotted patch consisting of a rectangular ring radiator withpassive radiators inside. The variation of the design was done by changing theshape of these passive radiators. For free space performance, two types of excitations were used—waveguide port and a coaxial probe. The coaxial probe signifi-cantly improved both the bandwidth and radiation efficiency. The centerfrequency of all the designs was close to 60 GHz with a bandwidth of more than5 GHz. These designs achieved a maximum gain of 8.47 dB, 10 dB, and 9.73 dBwhile the radiation efficiency was around 94%. For body-centric applications,these antennas were simulated at two different distances from a human torsophantom using a coaxial probe. The torso phantom was modeled by taking threelayers of the human body—skin, fat, and muscle. Millimeter waves have lowpenetration depth in the human body as a result antenna performance is lessaffected. A negligible shift of return loss curves was observed. Radiation efficiencies dropped at the closest distance to the phantom and at the furthest distance, theefficiencies increased to free space values. On the three layers human body phantom, all three different antenna designs show directive radiation patterns towards offthe body. All three designs exhibited similar results in terms of center frequency andefficiency but varied slightly by either having better bandwidth or maximum gain.

关键词： Body-centric communication coaxial probe high gain millimeterwave 60 GHz on-body patch compact antenna antenna performance

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Antioxidant compounds and minerals in tomatoes by Trichodermaenriched biofertilizer and their relationship with the soil environments

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Journal of Integrative Agriculture 2017年第3期16卷 691-703页

作者： Yeakub khan Manjurul Haque Abul hossain Molla Mizanur Rahman mohammad Zahangeer Alam Department of Environmental Science Faculty of Agriculture Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur 1706 Bangladesh Department of Soil Science Faculty of Agriculture Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur 1706 Bangladesh

The experiment was conducted to evaluate the efficacy of Trichoderma-enriched biofertilizer（BioF/compost）on antioxidants and minerals in ripe tomatoes and soil health improvements in terms of nutrient availability and microbial *** study was comprised of six treatments：control（zero input）;recommended doses of NPK（135.5,45.6 and 22.9 kg ha^-1,respectively）;100%BioF/compost;75%BioF/compost＋25%N;50%BioF/compost＋50%N;and 25%BioF/compost＋75%*** recommended doses of P and K were used in the last three *** was found that the application of 100%BioF/compost enhanced plant growth,leaf greenness,and produced 12.9%higher yield compared to the recommended doses of NPK and other *** contents（P,K,Ca,Mg,Cu,Fe,Mn and Zn）in tomato roots,shoots and fruits and antioxidant compounds,i.e.,ascorbic acid,β-carotine,and lycopene were increased significantly in fruits fertilized with100%BioF/*** high efficiency of Trichoderma compost might be the result of its potential of nutrient solubilization and harboring soil ***,BioF/compost increased soil fertility and favored growth of microbes in the rhizosphere which ultimately contributed to higher yield,antioxidant,and mineral concentrations in ***,Trichoderma-enriched biofertilizer may reduce application of chemical fertilizers and therefore,can be considered as a noble practice in sustainable agriculture.

关键词： Trichoderma harzianum T22 minerals .antioxidants nutrient availability microbial populations

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A New Algorithm for a Condenser Design for Large-Scale Nuclear Power Plants in Tropical Region

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Journal of Thermal Science 2020年第5期29卷 1370-1389页

作者： khan Abid hossain ISLAM Md.Shafiqul Department of Industrial and Production Engineering Jashore University of Science and TechnologyJashore 7408Bangladesh Department of Nuclear Engineering University of DhakaDhaka 1000Bangladesh

This work presents a new velocity search algorithm for designing a condenser of a 1200 MWe large-scale nuclear power plant situated in tropical *** this,the condenser pressure was considered in the range of 7.5-15 kPa while its tube inner diameter was taken as 28 mm with 1 mm tube wall *** longitudinal and transverse condensers with multiple shell tanks and varied shell tank lengths from 8-14 m have been considered in this *** different tertiary coolant temperature rises were chosen as 4°C,8°C and 12°C by considering tropical region average reservoir water temperature range of 28°C to 32°C during *** of tertiary coolant was kept within 0.75-1.5 m/s to ensure sufficient turbulence to avoid erosion-corrosion of the *** simulation has been employed to obtain tube-side pressure drop and convection heat transfer coefficient directly from tertiary coolant inlet velocity using κ-ω turbulent flow model.A new iterative“Velocity-search algorithm”has been developed that focuses on finding the correct tertiary coolant velocity instead of overall heat transfer *** revealed that velocity-search algorithm yielded very close to the important physical and thermal parameters of condenser compared to the existing design data in large scale nuclear power ***-search algorithm has given less number of condenser design physical parameters that meets the velocity acceptance criteria for longitudinal condenser compared to the transverse ***,velocity-search algorithm is found to be more reliable,robust,and consistent for condenser design compared to the conventional design algorithm used in Log-Mean Temperature Difference method.

关键词： nuclear power plant vacuum condenser velocity-search algorithm tropical region

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Trophic functioning of macrobenthic fauna in a tropical acidified Bornean estuary(Southeast Asia)

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International Journal of Sediment Research 2019年第1期34卷 48-57页

作者： mohammad Belal hossain Department of Fisheries and Marine Science Noakhali Science and Technology University

The trophic structure of a community is used to infer ecosystem functioning(e.g. energy transfer and nutrient cycling). Here the trophic structure of the benthic infaunal and epifaunal communities in the Brunei Estuary are characterized, and their distribution along an estuarine pH gradient is analyzed using univariate and multivariate techniques. This analysis revealed that surface deposit feeders(e.g., polychaetes) were numerically dominant within the infaunal communities whereas in the epifaunal communities filter feeders(e.g., bivalves) were highly abundant. Species richness for almost all trophic groups increased toward the lower estuary, except for omnivores in the epifaunal communities, which decreased markedly. Both Analysis of Variance(ANOVA) and Analysis of Similarities(ANOSIM) detected significant differences in the density of respective trophic groups among stations. Within infaunal communities, both Biological and Environmental procedure(BIO-ENV) and Canonical Correspondence Analysis(CCA) showed that trophic shifts were associated with environmental gradients. Surface-deposit feeders and omnivores were the most abundant macrobenthos of the upper estuary characterized by low salinity, low pH, and a higher percentage of mud particles. The proportion of filter feeders and carnivores increased with salinity/pH and sand. A more uniform distribution of trophic structure was found in the lower estuary, with high salinity and pH over sandy habitat. In contrast, within epifaunal trophic groups,the percentage of surface deposit feeders and omnivores declined, but filter feeders remarkably increased toward the sea. The proportion of carnivores remained similar at all stations. Non-Metric Multidimensional Scaling(nMDS) ordination for epifaunal trophic groups clearly demarcated higher salinity/pH stations from lower salinity/pH stations, suggesting different trophic compositions along the estuarine pH gradient.

关键词： Macrobenthic communities Trophic structure Environmental factors Acidity Tropical estuary

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Weather Variability,Socioeconomic Factors,and Pneumonia in Children Under Five-Years Old——Bangladesh,2012−2016

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China CDC weekly 2021年第29期3卷 620-623,I0001,I0002页

作者： mohammad Zahid hossain Shilu Tong Hilary Bambrick Md Alfazal khan Wenbiao Hu School of Public Health and Social Work Institute of Health and Biomedical InnovationQueensland University of TechnologyBrisbaneQueenslandAustralia Infectious Diseases Division International Centre for Diarrhoeal Disease ResearchBangladeshMohakhaliDhakaBangladesh Shanghai Children’s Medical Centre School of MedicineShanghai Jiao Tong UniversityShanghaiChina School of Public Health Institute of Environment and Population HealthAnhui Medical UniversityHefeiAnhuiChina Center for Global Health School of Public HealthNanjing Medical UniversityNanjingJiangsuChina Health System and Population Studies Division International Centre for Diarrhoeal Disease ResearchBangladeshMohakhaliDhakaBangladesh

Summary What is already known on this topic?Different socioecological factors were associated with childhood pneumonia in ***,previous studies did not assess spatial patterns,and socioecological factors and spatial va... 详细信息

关键词： pneumonia Bangladesh ecological

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Impact of industrial effluent on growth and yield of rice(Oryza sativa L.) in silty clay loam soil

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Journal of Environmental Sciences 2015年第4期27卷 231-240页

作者： mohammad Anwar hossain Golum Kibria Muhammad Mustafizur Rahman mohammad Mizanur Rahman Abul hossain Molla mohammad Mostafizur Rahman mohammad Khabir Uddin Department of Environmental Sciences Jahangirnagar University Department of Soil Science Bangabandhu Sheikh Mujibur Rahman Agricultural University Department of Bioenvironmental Science Bangabandhu Sheikh Mujibur Rahman Agricultural University

Degradation of soil and water from discharge of untreated industrial effluent is alarming in Bangladesh. Therefore, buildup of heavy metals in soil from contaminated effluent, their entry into the food chain and effects on rice yield were quantified in a pot experiment. The treatments were comprised of 0, 25%, 50%, 75% and 100% industrial effluents applied as irrigation water. Effluents, initial soil, different parts of rice plants and post-harvest pot soil were analyzed for various elements, including heavy metals. Application of elevated levels of effluent contributed to increased heavy metals in pot soils and rice roots due to translocation effects, which were transferred to rice straw and grain. The results indicated that heavy metal toxicity may develop in soil because of contaminated effluent *** metals are not biodegradable, rather they accumulate in soils, and transfer of these metals from effluent to soil and plant cells was found to reduce the growth and development of rice plants and thereby contributed to lower yield. Moreover, a higher concentration of effluent caused heavy metal toxicity as well as reduction of growth and yield of rice, and in the long run a more aggravated situation may threaten human lives,which emphasizes the obligatory adoption of effluent treatment before its release to the environment, and regular monitoring by government agencies needs to be ensured.

关键词： Biomass Crop yield Heavy metal Industrial effluent Soil pollution

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Risk factors for congenital nasolacrimal duct obstruction in children under two years of age

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国际眼科杂志 2025年第1期25卷 17-23页

作者： Rozhin Kasiri Gholamreza Khataminia Ali Kasiri mohammad Sadegh Mirdehghan mohammad Armin Kasiri Infectious Ophthalmologic Research Center Ahvaz Jundishapur University of Medical SciencesAhvaz ***Iran Islamic Azad University Tehran Medical Sciences Tehran ***Iran

·AIM:To identify various risk factors that may play a significant role in the development of congenital nasolacrimal duct obstruction(CNLDO).·METHODS:This observational case-control study included a case group of 122 children less than two years of age with CNLDO who underwent probing and irrigation treatment at the ophthalmology department of Imam Khomeini Hospital in Ahvaz,Iran,from June 2022 to June2024.A control group of 122 age-matched children without CNLDO was also included for *** was collected from the children's medical records.·RESULTS:The study found a significant correlation between the occurrence of CNLDO and several maternal factors,such as preeclampsia,the use of levothyroxine,hypothyroidism,having more than three pregnancies(gravidity>3),natural pregnancy,and gestational diabetes ***,in children,factors,such as oxygen therapy,anemia,reflux,jaundice,and a family history of CNLDO in first-degree relatives were associated with CNLDO,and maternal preeclampsia and hypothyroidism were found to significantly increase the risk of developing CNLDO in children.·CONCLUSION:Given that CNLDO affects both premature and full-term children,the present findings may potentially facilitate the early identification of children and infants at risk of nasolacrimal duct obstruction,thereby preventing the onset of chronic dacryocystitis.

关键词： risk factors congenital nasolacrimal duct obstruction children

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