检索结果-南通市图书馆

High population and dispersion of pentacoordinated Al~Ⅴ species on the surface of ?ame-made amorphous silica-alumina

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2019年第8期64卷 516-523页

作者： Zichun Wang Yijiao Jiang Xianfeng Yi Cuifeng Zhou aditya rawal James Hook Zongwen Liu Feng Deng Anmin Zheng Michael Hunger Alfons Baiker Jun Huang School of Chemical and Biomolecular Engineering & Sydney Nano Institute The University of Sydney Department of Engineering Macquarie University State Key Laboratory Magnetic Resonance & Atomic Molecular Physics Wuhan Institute of Physics & Mathematics Chinese Academy of Sciences Mark Wainwright Analytical Centre University of New South Wales Institute of Chemical Technology University of Stuttgart Department of Chemistry and Applied Bioscience ETH Zürich

Pentacoordinated Al(Al~Ⅴ)species in silica-alumina are promising to promote the formation of acid sites or act as surface defects for tailoring single-atom catalysts.However,pentahedral coordination(Al~Ⅴ)is rarely observed in conventionally prepared silica-alumina.Here,we show that high population and dispersion of Al~Ⅴ species on the surface of amorphous silica-alumina(ASA)can be achieved by means of flame spray pyrolysis.High resolution TEM/EDX,high magnetic-field NMR and DFT calculations are employed to characterize the structure of as-prepared ASAs.Solid-state ^(27)Al multi-quantum MAS NMR experiments show that most of the Al~Ⅴspecies are formed independently from the alumina phase and are accessible for guest molecules on the surface.Upon water adsorption,these Al~Ⅴ species are transformed to Al~Ⅵ species,structurally similar to surface Al~Ⅳ species,as confirmed by DFT calculations.The outstanding catalytic activity of as-synthesized ASA is demonstrated using the in situ H/D exchange reaction with deuterated benzene as an example.The Al~Ⅴ-rich ASA provides a much lower activation energy(～30 kJ/mol)than that reported for zeolite H-ZSM-5(～60 kJ/mol).The superior catalytic performance is attributed to the high Al~Ⅴcontent promoting the surface active sites in ASA.The knowledge gained on the synthesis of Al~Ⅴ-rich ASAs and the nature of aluminum coordination in these materials could pave the way to more efficient silica-alumina based catalysts.

关键词： Amorphous silica-alumina Pentacoordinated Al~Ⅴ species 27Al multiple quantum magic-angle-spinning NMR H/D exchange

Feeding Biochar to Cows:An Innovative Solution for Improving Soil Fertility and Farm Productivity

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2015年第5期25卷 666-679页

作者： Stephen JOSEPH Doug POW Kathy DAWSON David R.G.MITCHELL aditya rawal James HOOK Sarasadat TAHERYMOOSAVI Lukas VAN ZWIETEN Joshua RUST Scott DONNE Paul MUNROE Ben PACE Ellen GRABER Torsten THOMAS Shaun NIELSEN Jun YE Yun LIN PAN Genxing LI Lianqing Zakaria M.SOLAIMAN Discipline of Chemistry University of Newcastle School of Materials Science and Engineering University of New South Wales Electron Microscopy Center AIIMUniversity of Wollongong Institute of Resources Ecosystem and Environment of AgricultureNanjing Agricultural University Marron Brook Farm Warren Catchments Council 52 Bath StManjimup 6258 (Australia) Mark Wainwright Analytical Centre University of New South Wales Wollongbar Primary Industries Institute NSW Department of Primary Industries Institute of Soil Water and Environmental SciencesThe Volcani CenterAgricultural Research Organization Centre for Marine Bio-Innovation School of Biotechnology and Biomolecular SciencesThe University of New South Wales Soil Biology and Molecular Ecology Group School of Earth and Environment (M087)The University of Western Australia

Addition of biochar produced through thermal decomposition of biomass has been seen as a strategy to improve soils and to sequester carbon(C), but wide scale implementation of the technology requires to devise innovative profitable solutions. To develop biochar utilisation with an integrated system approach, an innovative program was implemented in 2012 on a 53-ha farm in Western Australia to determine the costs and benefits of integrating biochar with animal husbandry and improvement of pastures. Biochar was mixed with molasses and fed directly to cows. The dung-biochar mixture was incorporated into the soil profile by dung beetles.We studied the changes in soil properties over 3 years. Biochar extracted from fresh dung and from the soil to a depth of 40 cm was characterised. A preliminary financial analysis of the costs and benefits of this integrated approach was also undertaken. The preliminary investigation results suggested that this strategy was effective in improving soil properties and increasing returns to the farmer. It was also concluded that the biochar adsorbed nutrients from the cow's gut and from the dung. Dung beetles could transport this nutrient-rich biochar into the soil profile. There was little evidence that the recalcitrant component of the biochar was reduced through reactions inside the gut or on/in the soil. Further research is required to quantify the long-term impact of integrating biochar and dung beetles into the rearing of cows.

关键词：土壤肥力生物炭农业生产率创新喂牛土壤性质新鲜粪便生物利用

Influence of edaphic factors on distribution and condition of Himalayan silver birch(Betula utilis D.Don)communities in the northwestern Indian Himalayas

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2024年第2期21卷 590-606页

作者： Khashti DASILA Renu rawal Tanay BARMAN Sher Singh SAMANT Anita PANDEY Veena PANDE G.B.Pant National Institute of Himalayan Environment Almora 263643India Centre of Excellence on Sustainable Land Management Indian Council of Forestry Research and EducationDehradun 248006India Uttarakhand State Council for Science&Technology Dehradun 248015India Department of Biotechnology Graphic Era(Deemed to be University)Dehradun 248002India Department of Biotechnology Kumaun UniversityNainital 263136India

The basic concept of phytosociology is crucial for the assessment of species composition and dynamic ecological succession of forests supporting ecological services,functions,disturbance,and resilience that lead to the development of integrated areas such as ecological niche modeling and contribute to identifying the valuable bio-indicators which can be used in framing conservation and management planning.B.utilis is one of the most dominant tree species of treeline ecotone in the Himalayan Region.The species is also considered as indicator species for monitoring the past and recent climate change impact.The current study was carried out in the natural populations of B.utilis from the sub-alpine zone of North-western Indian Himalaya.The birch dominated forest harbors a total of 305 plant species comprising Angiosperms(51 families,160 genera and 277 species),Gymnosperms(03 families,05 genera and 07 species)and Pteridophytes(07 families,11 genera and 21 species)with Asteraceae,Ranunculaceae and Rosaceae as dominant family.Birch forests are found dominant in shady moist habitat and North West aspect.Geographical characteristics,anthropogenic and developmental activities affect the population structure of B.utilis and associated species.However,the species has fair regeneration status in the study area.The acidic nature of soil pH and spatial variation in edaphic characteristics may be due to geographical differences,rooting patterns and litter accumulation of below and above-ground vegetation.Biomass estimation of a representative population of B.utilis from each site showed that TAGBD,TCD and TBD were found maximum in ST3(Hamta Pass II site).The CCA analysis determined that environmental variables such as altitude,organic matter,available phosphorous,organic carbon,available nitrogen,and electrical conductivity played a significant role in determining tree species composition and distribution in B.utilis dominated forests.

关键词： Species composition Indicator species Biomass North-western Indian Himalaya Regeneration Environmental variables

An approach for selection of solid waste treatment and disposal methods based on fuzzy analytical hierarchy process

在线全文

学校读者我要写书评

暂无评论

Waste Disposal and Sustainable Energy 2022年第4期4卷 311-322页

作者： Amarjeet Kumar Atul Sharma Nekram rawal Department of Civil Engineering Motilal Nehru National Institute of Technology AllahabadAllahabad211004India

Solid waste management is a severe challenge in India due to massive and rapid growth in waste generation rates,environmental difficulties,and financial constraints for proper treatment.Poorly managed municipal solid waste(MSW)has substantial negative consequences for society,including financial and aesthetic harm,contamination of natural resources,environmental pollution,and severe health danger.Both qualitative and quantitative factors are required to select the appropriate solid waste treatment and disposal technologies.Multi-Criteria decision-making tools helped in analyzing solid waste in terms of qualitative and quantitative factors.In this paper,seven criteria and their sub-criteria are selected for ranking solid waste treatment and disposal technology using fuzzy-analytic hierarchy process.The results showed that composting is the most suitable option for solid waste treatment and disposal technology,followed by refuse-derived fuel.The incineration and sanitary landfills are the least preferred MSW management alternatives.The sensitivity analysis reveals a high consistency,robustness,and stability level.

关键词： Fuzzy-analytic hierarchy process Solid waste management Composting Refuse-derived fuel Incineration

Bio-Nanocarriers for Lung Cancer Management:Befriending the Barriers

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

Nano-Micro Letters 2021年第9期13卷 238-291页

作者： Shruti rawal Mayur Patel Department of Pharmaceutics Institute of PharmacyNirma UniversitySG HighwayChharodiAhmedabadGujarat 382481India

ABSTRACT Lung cancer is a complex thoracic malignancy developing consequential to aberrations in a myriad of molecular and biomolecular signaling pathways.It is one of the most lethal forms of cancers accounting to almost 1.8 million new annual incidences,bearing overall mortality to incidence ratio of 0.87.The dismal prognostic scenario at advanced stages of the disease and metastatic/resistant tumor cell populations stresses the requisite of advanced translational interdisciplinary interventions such as bionanotechnology.This review article deliberates insights and apprehensions on the recent prologue of nanobioengineering and bionanotechnology as an approach for the clinical management of lung cancer.The role of nanobioengineered(bio-nano)tools like bio-nanocarriers and nanobiodevices in secondary prophylaxis,diagnosis,therapeutics,and theranostics for lung cancer management has been discussed.Bioengineered,bioinspired,and biomimetic bio-nanotools of considerate translational value have been reviewed.Perspectives on existent oncostrategies,their critical comparison with bio-nanocarriers,and issues hampering their clinical bench side to bed transformation have also been summarized.

关键词： Biomimetic nanoparticles Exosomes Circulating tumor cells Mesenchymal stem cells Theranostics

Integrated Bi2O3 nanostructure modified with Au nanoparticles for enhanced photocatalytic activity under visible light irradiation

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2017年第3期27卷 289-296页

作者： Hankwon Lim Sher Bahadur rawal Department of Advanced Materials and Chemical Engineering Catholic University of Daegu

An integrated Bi2O3（i-Bi2O3） nanostructure with a particle size 10 nm inducing agglomerated structure were synthesized by dissolving bismuth nitrate pentahydrate in diethylene glycol at 180 ℃ with post heat treatment.The prepared i-Bi2O3nanostructures were employed for the construction of Au/i-Bi2O3composite system and characterized by X-ray diffraction pattern,UV-visible diffuse reflectance spectroscopy（DRS）,and transmission electron microscopy,X-ray photoemission spectroscopy（XPS） and Energy dispersive X-ray spectroscopy（EDS）.The i-Bi2O3nanostructure and Au/i-Bi2O3composite system were found to exhibit high photocatalytic activity than commercial Bi2O3in decomposing salicylic acid under visible light irradiation.The high catalytic activity of i-Bi2O3nanostructure was deduced to be caused by charge separation facilitated by electron hopping between the particles within the integrated structure and space-charge separation between i-Bi2O3and Au.The charge separation behavior in i-Bi2O3nanostructure was further bolstered by comparing the measured.OH radical produced in the solution with i-Bi2O3nanostructure,commercial Bi2O3and Au/i-Bi2O3composite which readily react with 1,4-terephthalic acid（TA） inducing 2-hydroxy terephthalic acid（TAOH） that shows unique fluorescence peak at 426 nm.The space-charge separation between i-Bi2O3and An was confirmed by measuring the electron spin resonance（ESR） spectra.

关键词： Integrated Bi2O3 nanostructure Organic pollutant mineralization Photocatalyst Salicylic Acid(SA) Visible light

Myocardial tuberculosis: A rare case report

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Discussion of Clinical Cases 2022年第2期9卷 13-15页

作者： Gautam rawal Sankalp Yadav Sujana Rajamma Respiratory Intensive Care Max Super Specialty HospitalSaketNew DelhiIndia Department of Medicine&TB Chest Clinic Moti NagarNorth Delhi Municipal CorporationNew DelhiIndia Musgrove Park Hospital TauntonSomersetUnited Kingdom

Tuberculosis(TB)is one of the most common causes of mortality and morbidity globally,with Indian subcontinent having quite a large number of TB cases.TB can involve any organ system in humans;however,the disease affecting the cardiovascular system is rare.On the other hand,myocardial tuberculosis is a serious entity and can,unfortunately,be fatal if the diagnosis is missed or delayed.Therefore,the possibility of TB involving the myocardium should always be considered in areas with a high prevalence of TB,like the Indian subcontinent.Anti-TB therapy(with corticosteroids in some cases),along with early detection and suspicion,is proven to be quite effective in management and cure in most cases.We describe a case of sputum AFB(acid-fast bacilli)positive pulmonary TB with dilated cardiomyopathy,and impaired/decreased left ventricular systolic function,which gradually improved after anti-tubercular decongestive therapy.

关键词： Cardiomyopathy Myocarditis Tuberculosis

Prospects for 3D bioprinting of organoids

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

Bio-Design and Manufacturing 2021年第3期4卷 627-640页

作者： Preety rawal Dinesh M.Tripathi Seeram Ramakrishna Savneet Kaur Department of Molecular and Cellular Medicine Institute of Liver and Biliary Sciences(ILBS)D1Vasant KunjNew Delhi 110070India School of Biotechnology Gautam Buddha UniversityGreater NoidaIndia Department of Mechanical Engineering National University of SingaporeSingaporeSingapore

Three-dimensional(3D)organoids derived from pluripotent or adult tissue stem cells seem to possess excellent potential for studying development and disease mechanisms alongside having a myriad of applications in regenerative therapies.However,lack of precise architectures and large-scale tissue sizes are some of the key limitations of current organoid technologies.3D bioprinting of organoids has recently emerged to address some of these impediments.In this review,we discuss 3D bioprinting with respect to the use of bioinks and bioprinting methods and highlight recent studies that have shown success in bioprinting of stem cells and organoids.We also summarize the use of several vascularization strategies for the bioprinted organoids,that are critical for a complex tissue organization.To fully realize the translational applications of organoids in disease modeling and regenerative medicine,these areas in 3D bioprinting need to be appropriately harnessed and channelized.

关键词： Three-dimensional bioprinting Bioink Organoid Microfluidics Extracellular matrix(ECM) Biomaterial

Assessing Conservation Values of Forest Communities in Nanda Devi Biosphere Reserve: Plant Diversity, Species Distribution and Endemicity

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2015年第4期12卷 878-890页

作者： Balwant RAWAT Sanjay GAIROLA Ranbeer S.rawal G.B.Pant Institute of Himalayan Environment and Development Society for the Conservation of Nature Parnkuti Anantpur University Road Sharjah Seed Bank & Herbarium Laboratory Sharjah Research Academy University of Sharjah

Present study has been conducted in a biodiversity rich Nanda Devi Biosphere Reserve between 2000-3800 m in two different forest physiognomy holding sites to analyze the structure and composition of the forest communities including richness of native, non native and endemic species,and suggest conservation values at community and reserve level.A total of 60 sites were sampled and grouped in 11 and 8 communities for two representative sites Pindari-Sunderdhunga-Kafni(PSK) and Lata-Tolma-Phagti(LTP) respectively.From the sampled sites, 451 species(11.8%, 53 trees;17.71%, 80 shrubs; and 70.51%, 318 herbs) have been recorded.In general, PSK site represented 73.6% and LTP site represented only 54.9% of the total plant species recorded in the study area.Out of total species in PSK site, native species contributed 59.6%(198spp.) and 24.7% species were endemic and near endemic.In LTP site, 66.5% species were Himalayan natives and 33.5% were endemic and near endemic.The species richness ranged from 4-23 ind ha-1(tree),3-18 ind ha-1(sapling), 5-19 ind ha-1(seedling) in PSK site and 4-18 ind ha-1(tree), 4-11 ind ha-1(sapling), 4-16 ind ha-1(seedling) in LTP site.The density ranged from 260-535 ind ha-1(tree), 145-633 ind ha-1(sapling), 1450-8170 ind ha-1(seedling) in PSK site and 599-1211 ind ha-1(tree), 70-951 ind ha-1(sapling),470-1665 ind ha-1(seedling) in LTP site.Species diversity for trees ranged from 0.73-3.37, saplings,0.64-2.67, seedlings, 0.70-2.51, shrubs, 1-2.34 and herbs, 2.02-3.21 in PSK site and 0.63-1.61, saplings,0.76-1.36, seedlings, 0.35-1.79, shrubs, 0.98-2.73 and herbs, 2.48-3.61 in LTP site.These recorded values were almost comparable with the studies conducted in sub-tropical, temperate and sub-alpine regions of the west Himalaya.In some cases the values were slightly higher than the reported values.The important communities with high conservation values have been identified based on different ecological parameters and species distribution.Among all the prioritized communities, Mixed Silver firRhodode

关键词：生物圈保护区植物物种保护价值森林群落植物多样性混合社区物种丰富度评估