检索结果-南通市图书馆

Experimental evaluation of asphalt mixtures with emerging additives against cracking and moisture damage

Journal of Road Engineering 2023年第4期3卷 336-349页

作者： md.tanvir a.sarkar Mostafa A.Elseifi Department of Civil and Environmental Engineering Louisiana State UniversityBaton RougeLA 70803USA

The objective of this study was to evaluate and recommend an asphalt mixture design with emerging additive technologies that would provide superior performance against asphalt concrete(AC)stripping and *** achieve this objective,a laboratory test program was developed to evaluate the use of nanomaterials(nanoclay and graphene nanoplatelet),an emerging anti-stripping agent(adhere),and warm-mix asphalt technologies(ZycoTherm,Sasobit,and EvoTherm).Two mix types were evaluated,which were a stone-matrix asphalt(SMA)and a dense-graded binder *** addition,the modified Lottman test(AASHTO T 283)and the indirect tensile asphalt cracking test(IDEAL-CT)test were used as performance indicators of moisture damage resistance and cracking *** were analyzed statistically to identify and quantify the effects of the design variables and selected additives on the performance,moisture damage resistance,and durability of asphalt *** on the cracking test results,a superior cracking resistance performance was observed with ZycoTherm,irrespective of the mix *** had the lowest average cracking indices for both mix types,which suggest that it would not perform as well as the other additives in terms of cracking ***,SMA mixes displayed greater cracking resistance than the dense-graded mixtures,which may have been the result of the reclaimed asphalt pavement(RAP)material used in the dense-graded mix and its lower asphalt binder *** terms of moisture resistance,both nanomaterials(graphene nanoplatelet and nanoclay)did not perform well as they did not meet the minimum required tensile strength ratio(TSR)criterion(>0.80).In addition,nanomaterials showed the lowest TSR values in both mix types suggesting that their effectiveness against moisture-induced damage may not be as good as warm-mix *** the other hand,warm-mix additives were expected to show enhanced performance in terms of moisture resistance as compared to the o

关键词： Pavement Asphalt concrete Moisture damage Cracking Laboratory testing Nanomaterials

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A critical review of ash slagging mechanisms and viscosity measurement for low-rank coal and bio-slags

引用

Frontiers in Energy 2021年第1期15卷 46-67页

作者： md.tanvir ALAM Baiqian DAI Xiaojiang WU Andrew HOADLEY Lian ZHANG Department of Chemical Engineering Monash UniversityClaytonVictoria 3800Australia R&D Division Shanghai Boiler Works Co.Ltd.Shanghai 200245China

Gasification or combustion of coal and biomass is the most important form of power generation ***,the use of coal/biomass at high temperatures has an inherent problem related to the ash *** formation of ash leads to a problematic phenomenon called *** is the accumulation of molten ash on the walls of the furnace,gasifier,or boiler and is detrimental as it reduces the heat transfer rate,and the combustion/gasification rate of unburnt carbon,causes mechanical failure,high-temperature corrosion and on occasions,superheater *** improve the gasifier/combustor facility,it is very important to understand the key ash properties,slag characteristics,viscosity and critical viscosity *** paper reviews the content,compositions,and melting characteristics of ashes in differently ranked coal and biomass,and discusses the formation mechanism,characteristics,and structure of *** particular,this paper focuses on low-rank coal and biomass that have been receiving increased attention ***,it reviews the available methodologies and formulae for slag viscosity measurement/prediction and summarizes the current limitations and potential ***,it discusses the slagging behavior of different ranks of coal and biomass by examining the applicability of the current viscosity measurement methods to these fuels,and the viscosity prediction models and factors that affect the slag *** review shows that the existing viscosity models and slagging indices can only satisfactorily predict the viscosity and slagging propensity of high-rank coals but cannot predict the slagging propensity and slag viscosity of low-rank coal,and especially biomass ashes,even if they are limited to a particular composition ***,there is a critical need for the development of an index,or a model or even a measurement method,which can predict/measure the slagging propensity and slag viscosity correctly for all low-rank co

关键词： slag viscosity biomass low-rank coal combustion gasification

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Improved voltage tracking of autonomous microgrid technology using a combined resonant controller with lead-lag compensator adopting negative imaginary theorem

引用

Protection and Control of Modern Power Systems 2022年第1期7卷 149-164页

作者： md.Yah-Ya Ul Haque md.Rashidul Islam tanvir Ahmed md.Rafiqul Islam Sheikh Department of Electrical and Electronic Engineering Varendra UniversityRajshahi 6204Bangladesh Department of Electrical and Electronic Engineering Rajshahi University of Engineering&TechnologyRajshahi 6204Bangladesh

Growing application of distributed generation units at remote places has led to the evolution of microgrid(MG)*** an MG system functions independently,i.e.,in autonomous mode,unpredictable loads and uncertainties emerge throughout the *** obtain stable and flexible operation of an autonomous MG,a rigid control mechanism is *** this paper,a robust high-performance controller is introduced to improve the performance of voltage tracking of an MG system and to eliminate stability problems.A combination of a resonant controller and a lead-lag compensator in a positive position feedback path is designed,one which obeys the negative imaginary(NI)theorem,for both single-phase and three-phase autonomous MG *** controller has excellent tracking *** is investigated through considering various uncertainties with different load *** feasibility and effectiveness of the controller are also determined with a comparative analysis with some well-known controllers,such as linear quadratic regulator,model predictive and NI approached resonant *** confirms the superi-ority of the designed controller.

关键词： Negative imaginary theorem Resonant controller Lead-lag compensator Autonomous microgrid Voltage tracking

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Optimization of process parameters for the bioconversion of activated sludge by Penicillium corylophilum, using response surface methodology

引用

Journal of Environmental Sciences 2007年第1期19卷 23-28页

作者： sarkar Mannan Ahmadun Fakhru'l-Razi md Zahangir Alam Department of Chemical and Environmental Engineering Faculty of Engineering University Putra Malaysia (UPM)43400 UPM SerdangSelangorD.E.Malaysia. Department of Biotechnology Engineering Faculty of Engineering International Islamic University Malaysia (IIUM)Jalan Gombak53100 Kuala LumpurMalaysia.

The optimization of process parameters for the bioconversion of activated sludge by Penicillium corylophilum was investigated using response surface methodology （RSM）. The three parameters namely temperature of 33℃, agitation of 150 r/min, and pH of 5 were chosen as center point from the previous study of fungal treatment. The experimental data on chemical oxygen demand （COD） removal （%） were fitted into a quadratic polynomial model using multiple regression analysis. The optimum process conditions were determined by analyzing response surface three-dimensional surface plot and contour plot and by solving the regression model equation with Design Expert software. Box-Behnken design technique under RSM was used to optimize their interactions, which showed that an incubation temperature of 32.5℃, agitation of 105 r/min, and pH of 5.5 were the best conditions. Under these conditions, the maximum predicted yield of COD removal was 98.43%. These optimum conditions were used to evaluate the trail experiment, and the maximum yield of COD removal was recorded as 98.5%.

关键词： optimization response surface methodology Penicillium activated sludge domestic wastewater sludge

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Efficient removal of heavy metals from electroplating wastewater using polymer ligands

引用

Frontiers of Environmental Science & Engineering 2016年第2期10卷 352-361页

作者： md. Lutfor RAHMAN Shaheen M. sarkar Mashitah Mohd YUSOFF Faculty of Industrial Sciences & Technology Universiti Malaysia Pahang 26300 Gambang Kuantan Malaysia

Poly（hydroxamic acid）-poly（amidoxime） che- lating ligands were synthesized from poly（methyl acrylate-co-acrylonitrile） grafted acacia cellulose for removing toxic metal ions from industrial wastewaters. These ligands showed higher adsorption capacity to copper （2.80 mmol. g-l） at pH 6. In addition, sorption capacities to other metal ions such as iron, zinc, chromium, and nickel were also found high at pH 6. The metal ions sorption rate （tl/2） was very fast. The rate of adsorption of copper, iron, zinc, chromium, nickel, cobalt, cadmium and lead were 4, 5, 7, 5, 5, 8, 9 and 11 min, respectively. Therefore, these ligands have an advantage to the metal ions removal using the column technique. We have successfully investigated the known concentration of metal ions using various parameters, which is essential for designing a fixed bed column with ligands. The wastewater from electroplating plants used in this study, having chromium, zinc, nickel, copper and iron, etc. For chromium wastewater, ICP analysis showed that the Cr removal was 99.8% and other metal ions such as Cu, Ni, Fe, Zn, Cd, Pb, Co and Mn removal were 94.7%, 99.2%, 99.9%, 99.9%, 99.5%, 99.9%, 95.6% and 97.6%, respectively. In case of cyanide wastewater, the metal removal, especially Ni and Zn removal were 96.5 and 95.2% at higher initial concentra- tion. For acid/alkali wastewater, metal ions removing for Cd, Cr and Fe were 99.2%, 99.5% and 99.9%, respectively. Overall, these ligands are useful for metal removal by column method from industrial wastewater especially plating wastewater.

关键词： heavy metals adsorption wastewater chelat-ing ligands plating industry

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Reproductive development of two groundnut cultivars as influenced by boron and light

引用

Information Processing in Agriculture 2018年第2期5卷 289-293页

作者： md.Quamruzzaman md.Jafar Ullah md.Fazlul Karim Nazrul Islam md.Jahedur Rahman md.Dulal sarkar Department of Agronomy Sher-e-Bangla Agriculture UniversityDhaka 1207Bangladesh Department of Horticulture Sher-e-Bangla Agriculture UniversityDhaka 1207Bangladesh

Boron is an important micronutrient that enhances reproductive growth of crops such as *** also plays an important role for pegging of *** has been little information on the application of boron and light in groundnut in Bangladesh.A field experiment was conducted to study the effects of boron and light on the reproductive development of two groundnut *** considered as two groundnut cultivars,viz.,‘Dhaka-1(C1)’and‘BARI Chinabadam-8(C2)’,three levels of boron(B),viz.,0-kg B ha^-1(B0),1-kg B ha^-1(B1)and 2-kg B ha^-1(B2),and two levels of light,viz.,normal day light(≈12-h light)and normal day light+6-h extended red light at night(≈18-h light).Result revealed that the reproductive development,yield and shelling percentage of groundnut were markedly increased with the application of *** to imposition of light all of reproductive units increased but decrease number of pods and pod *** highest reproductive unit and yield were observed from‘BARI Chinabadam-8’.Therefore,reproductive development could be improved by application of boron in improved cultivars(BARI Chinabadam-8)but not for under extended light.

关键词： Groundnut Reproductive development Light Boron Pegs Pods Shelling percentage

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Synthesis and photoswitching properties of azobenzene liquid crystals with a pentafluorobenzene terminal

引用

Chinese Chemical Letters 2014年第12期25卷 1611-1614页

作者： md Lutfor Rahman Gurumuthy Hegde Shaheen M.sarkar Mashitah Mohd Yusoff Faculty of Industrial Sciences  Technology Universiti Malaysia PahangKuantan 26300Malaysia

The fluorine-substituted benzoate ester rod-shaped liquid crystals containing an azobenzene side chain linked with terminal double bonds were synthesized and *** mesophase and photoswitching properties were determined by polarizing optical microscopy（POM）,differential scanning calorimetry（DSC） and UV-visible *** rod-shaped compound 4a having an odd number of carbon atoms in the alkyl chains exhibits nematic phase and SmA type phase whereas compound 4b having an even number of carbon atoms showed only nematic *** fluorinecontaining compounds 4c and 4d showed only SmA type *** photoswitching properties of these compounds showed a rate of trans to cis isomerization ranging 19-20 s,whereas reverse process took around 230 min in *** materials may be ideal in the field of optically rewritable applications where both on and off rates should be crucial.

关键词： Liquid crystals Azobenzene Photoswitching Fluorine compounds

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nitrogen-doped graphene quantum dots: Optical properties modification and photovoltaic applications

引用

Nano Research 2019年第5期12卷 1041-1047页

作者： md.tanvir Hasan Roberto Gonzalez-Rodriguez Conor Ryan Kristof Pota Kayla Green Jeffery L.Coffer Anton V.Naumov Department of Physics and Astronomy Texas Christian UniversityTCU Box 298840Fort WorthTexas 76129USA Department cf Chemistry and Eiochemistry Texas Christian UniversityTCU Box 298860Fort WorthTexas 76129USA

In this work,we utilize a bottom-up approach to synthesize nitrogen self-doped graphene quantum dots (NGQDs) from a single glucosamine precursor via an eco-friendly microwave-assisted hydrothermal *** and optical properties of as-produced NGQDs are further modified using controlled ozone ***-treated NGQDs (Oz-NGQDs) are reduced in size to 5.5 nm with clear changes in the lattice structure and/D//G Raman ratios due to the introduction/alteration of oxygen-containing functional groups detected by Fourier-transform infrared (FTIR) spectrometer and further verified by energy dispersive X-ray spectroscopy (EDX) showing increased atomic/weight percentage of oxygen *** with structural modifications,GQDs experience decrease in ultraviolet-visible (UV-vis) absorption coupled with progressive enhancement of visible (up to 16 min treatment) and near-infrared (NIR)(up to 45 min treatment) *** allows fine-tuning optical properties of NGQDs for solar cell applications yielding controlled emission increase,while controlled emission quenching was achieved by either blue laser or thermal *** Oz-NGQDs were further used to form a photoactive layer of solar calls with a maximum efficiency of 2.64% providing a 6-fold enhancement over untreated NGQD devices and a 3-fold increase in fill factor/current *** study suggests simple routes to alter and optimize optical properties of scalably produced NGQDs to boost the photovoltaic performance of solar cells.

关键词： nitrogen-doped graphene quantum dots ozone treatment optical properties photovoltaics solar cells

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Two New Records of Snapper(Perciformes, Lutjanidae) from Saint Martin's Island, Bangladesh

引用

Journal of Ocean University of China 2021年第2期20卷 439-444页

作者： sarkar Provakar ISLAM md Jayedul HABIB AHMShafiullah NEOGI Amit Kumer HABIB Kazi Ahsan Department of Zoology Jagannath UniversityDhaka 1100Bangladesh Aquatic Bioresource Research Laboratory Department of Fisheries Biology and GeneticsSher-e-Bangla Agricultural UniversityDhaka 1207Bangladesh Department of Fisheries Biology and Genetics Faculty of FisheriesAquaculture and Marine ScienceSher-e-Bangla Agricultural UniversityDhaka 1207Bangladesh

The present work documented two snapper species, Lutjanus fulvus Forster, 1801 and Lutjanus erythropterus Bloch, 1790, recently collected from the Saint Martin's Island, Bay of Bengal, Bangladesh, during a survey on coral associated fishes of Bangladesh from July 2017 to September 2018. These two species were identified with morphological characteristics and by analyzing partial mitochondrial COI sequences. The document also included an updated checklist of snappers available in Bangladesh.

关键词： Lutjanus fulvus Lutjanus erythropterus DNA barcoding Bay of Bengal

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multi-species probiotics enhance survival,growth,intestinal microbiota and disease resistance of rohu(Labeo rohita)larvae

引用

Water Biology and Security 2024年第1期3卷 71-79页

作者： Zannatul Ferdous md Kabir Hossain md Hadiuzzaman SMRafiquzzaman KM Abdul Halim tanvir Rahman md Ali Reza Faruk Zulhisyam Abdul Kari md Shahjahan Laboratory of Fish Ecophysiology Department of Fisheries ManagementBangladesh Agricultural UniversityMymensingh2202Bangladesh Department of Aquaculture Bangladesh Agricultural UniversityMymensingh2202Bangladesh Department of Fisheries Matshoy BhabanDhakaBangladesh Department of Fisheries Biology&Aquatic Environment Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur1706Bangladesh Department of Agricultural Sciences Faculty of Agro-Based IndustryUniversiti Malaysia KelantanJeli Campus17600JeliKelantanMalaysia

Multi-strain probiotics provide the most dependable approaches to improve health,immune response,and disease resistance in farmed *** the present study,we examined the effects of multi-species probiotics on the survival,growth,immune response,and disease resistance of rohu(Labeo rohita)*** hatched larvae from the day of first feeding(average weight of 0.003 g)were reared with multi-species probiotics having a combination of Bacillus subtilis(109 colony forming units(cfu)/mL)and Lactobacillus spp.(Lactobacillus plantarum,Lactobacillus buchneri-1011 cfu/mL)in water containing doses of 0(control-C),0.5 mL/L(treatment 1-T1),and 1.0 mL/L(treatment 2-T2)in triplicates for 90 *** the experiment,a challenge test was performed to assess the fish's resistance to pathogenic Aeromonas *** higher survival was recorded in larvae of treated groups(87%in T2 and 79%in T1)compared to the control(62%).Significantly higher growth performance(weight gain and specific growth rate—SGR)was shown by the probiotic-treated larval groups compared to the *** supplementation resulted in significantly higher counts of total viable colony(TVC)and lactic acid bacteria(LAB)in the *** immunological parameters(mucosal fold fattening,goblet cell abundance,expansion of lamina propria and enterocytes)of the gut were significantly better in probiotic-treated *** liver of treated fish showed irregular shape nuclei turning into regular shape and reducing spaces between the hepatic ***-treated fish had the highest post-challenge survival rate(90%)against *** *** erythrocytes of challenged fish treated with probiotics had significantly lower frequencies of various nuclear and cellular *** findings suggest that multi-species probiotic supplements could improve the survival,growth,health status,and immune response of rohu in the early stages of its development.

关键词： Aquaculture Disease resistance Immunity Labeo rohita Probiotics

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：