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Comparative study of polyh.droxyalkanoates production from acidified and anaerobically treated brewery wastewater using enrich.d mixed microbial culture

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Journal of Environmental Sciences 2019年第4期31卷 137-146页

作者： Pravesh.Tamang Rintu Banerjee Steph.n k?ster Regina Nogueira Institute for Sanitary Engineering and Waste Management Leibniz Universitat Hannover Welfengarten 1D-30167 HannoverGermany Indian Institute of Tech.ology kh.ragpur Department of Agricultural and Food Engineering721302 KharagpurIndia

Th. production of polyh.droxyalkanoates(Ph.) from wastewaters using microbial mixed cultures(MMC) h.s been attracting increased interest because of Ph.'s biodegradability ch.racteristics. Production of Ph. by an MMC enrich.d with.Ph.-accumulating bacteria was compared using anaerobically treated and acidified brewery wastewaters under various feeding strategies, namely pulse and batch.feed addition. To obtain an enrich.d MMC, a sequencing batch.reactor was inoculated with.activated sludge fed with.acetate and subjected to aerobic dynamic feeding. Th. enrich.d MMC was able to accumulate Ph. up to 72.6% of cell dry weigh.(CDW) with.pulse addition of acetate controlled by th. dissolved oxygen(DO) concentration in th. reactor. In a batch.accumulation experiment with.acetate,th. Ph. content ach.eved(28.5% CDW) was less th.n th.t of th. pulse feeding strategy with.th. same amount of acetate(～2000 mg C/L). Using anaerobically treated and acidified brewery wastewater fed in pulses, th. maximum Ph. accumulated by th. enrich.d MMC was similar for both.wastewaters(45% CDW), in spite of th. h.gh.r volatile fatty acid concentration in acidified brewery wastewater. Th. pulse feed addition controlled by th. DO concentration was difficult to implement for wastewater as compared to acetate because th. difference in DO concentration between substrate availability and depletion was low. For th. batch.addition of acidified wastewater, a sligh.ly lower Ph. content(39%CDW) was obtained. Th.se results sh.w th.t both.brewery wastewaters can be utilized for Ph. production with.a similar maximum Ph. storage capacity.

关键词： Polyh.droxyalkanoates Ph.-accumulating bacteria Microbial mixed culture Brewery wastewater Aerobic dynamic feeding Pulse feeding and batch.feeding

Opening th. box of PANTh.RA in Alzh.imer’s disease

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Signal Transduction and Targeted Th.rapy 2022年第11期7卷 3976-3977页

作者： Martin korte Reinh.rd W.köster Tech.isch. Universität Braunsch.eig Zoological InstituteDiv.Cellular Neurobiology Spielmannstr.738106BraunschweigGermany Helmholtz Centre for Infection ResearchAG NINDInhoffenstraße 738124BraunschweigGermany Tech.isch. Universität Braunsch.eig Zoological Institute.Div.Cellular and Molecular NeurobiologySpielmannstr.738106BraunschweigGermany

A study publish.d in Nature Neuroscience indicates th.t autoph.gy dysfunction in neurons precedes th. formation of amyloid plaques.1 Th.se findings ask for a reconsideration of th. conventionally accepted sequence of ... 详细信息

关键词： Alzh.imer amyloid plaques

Flow-regime transitions in fluidized beds of non-sph.rical particles

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Particuology 2016年第6期14卷 1-15页

作者： h. kruggel-Emden k. Vollmari Ruh.-Universitaet Boch.m Universitaetsstrasse 150 D-44780 Bochum Germany

Fluidized beds frequently involve non-sph.rical particles, especially if biomass is present. For sph.ri- cal particles, numerous experimental investigations h.ve been reported in th. literature. In contrast, complex-sh.ped particles h.ve received much.less attention. Th.re is a lack of understanding of h.w par- ticle sh.pe influences flow-regime transitions. In th.s study, differently sh.ped Geldart group D particles are experimentally examined. Bed h.igh., pressure drop, and th.ir respective fluctuations are analyzed. With.increasing deviation of particle sh.pe from sph.res, differences in flow-regime transitions occur with.a tendency for th. bed to form ch.nnels instead of undergoing smooth.fluidization. Th. correlations available in th. literature for sph.rical particles are limited in th.ir applicability wh.n used to predict regime ch.nges for complex-sh.ped particles. h.nce, based on existing correlations, improvements are derived.

关键词： Fluidized bed Flow regimes Non-sph.rical particles Pressure drop and fluctuations Bed h.igh.

Impact of wind power generating system integration on frequency stabilization in multi-area power system with.fuzzy logic controller in deregulated environment

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Frontiers in Energy 2015年第1期9卷 7-21页

作者： Y. k. Bh.TESh.AR h. D. MATh.R h. SIGUERDIDJANE Department of Electrical and Electronics Engineering Birla Institute ofTechnology and Science Pilani Rajasthan 333031 India Automatic Control Department Sup61ec Gif-sur-Yvette 91192 France

Among th. available options for renewable energy integration in existing power system, wind power is being considered as one of th. suited options for future electrical power generation. Th. major constraint of wind power generating system （WPGS） is th.t it does not provide inertial support because of power electronic converters between th. grid and th. WPGS to facilitate frequency stabilization. Th. proposed control strategy suggests a substantial contribution to system inertia in terms of sh.rt-term active power support in a two area restructured power system. Th. control sch.me uses fuzzy logic based design and takes frequency deviation as input to provide quick active power support, wh.ch.balances th. drop in frequency and tie-line power during transient conditions. Th.s paper presents a compreh.nsive study of th. wind power impact with.increasing wind power penetration on frequency stabilization in restructured power system scenario. Variation of load conditions are also analyzed in simulation studies for th. same power system model with.th. proposed control sch.me. Simula- tion results advocates th. justification of control sch.me over oth.r sch.mes.

关键词： two area power system automatic generationcontrol wind power generating system (WPGS) deregu-lated environment fuzzy logic controller (FLC)

An Analysis of th. Invariance and Conservation Laws of Some Classes of Nonlinear Ostrovsky Equations and Related Systems

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Ch.nese Ph.sics Letters 2011年第1期28卷 1-4页

作者： k. Fakh.r A. h. kara Department of Math.matics Faculty of Science Universiti Teknologi Malaysia 81310 UTM Skudai Johor Malaysia Sch.ol of Math.matics and Centre for Differential Equations Continuum Mechanics and Applications University of the Witwatersrand Johannesburg P Bag 3 Wits 2050 South Africa

A large class of partial differential equations in th. modelling of ocean waves are due to Ostrovsky. We determine th. invariance properties （th.ough.th. Lie point symmetry generators） and construct classes of conservation laws for some of th. models. In th. latter case, th. meth.d involves finding th. ＇multipliers＇ associated with.th. conservation laws with.a stronger emph.sis on th. ＇h.gh.r-order＇ ones. Th. relationsh.p between th. symmetries and conservation laws is investigated by considering th. invariance properties of th. multipliers.

关键词： Math.matical ph.sics Statistical ph.sics and nonlinear systems

NUMERICAL ANALYSIS OF Th. INFLUENCE OF Th. TIP CLEARANCE FLOWS ON Th. UNSTEADY CAVITATING FLOWS IN A Th.EE- D IMENSIONAL INDUCER

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Journal of h.drodynamics 2009年第1期21卷 34-40页

作者： OkITA k. UGAJIN h. MATSUMOTO Y. RIkEN Saitama 351-0198 Japan Ih. Corporation Yokohama 235-8501 Japan Department of Mech.nical Engineering The University of TokyoTokyo 113-8656 Japan

To clarify th. influences of th. tip clearance flows on th. unsteady cavitating flow, th. th.ee-dimensional unsteady cavitating flows th.ough.both.th. two-dimensional cascades and th. th.ee-dimensional inducer with.and with.ut tip clearance are performed numerically. Th. governing equations for th. compressible fluid flow with.th. DES turbulence model are employed with.th. assumption of th. isentropic process of liquid ph.se. Th. evolution of cavities is represented as th. source/sink of vapor ph.se. Th. basic equations in th. curve linear coordinate are solved by th. finite difference meth.d. As th. results of th. th.ee-dimensional cavitating flows th.ough.th. two-dimensional cascades, th. tip clearance flows from th. pressure side to th. suction side of th. blade produces th. tip vortex cavitation, wh.ch.affects th. sh.et cavitation on th. leading edge of th. next blade and enh.nces th. blockage effect near th. casing th.n th. flows with.ut tip clearance. On th. oth.r h.nd, in th. case of th. th.ee-dimensional inducer, th. large backflow cavitation is observed around th. inlet of th. inducer, wh.re th. cavities are developed on th. casing by th. tip clearance flows. Th. large pressure gradient between th. non-cavitating pressure side and th. cavitating suction side enh.nces th. tip clearance flows. Th. calculation considering th. tip clearance reproduces th. developed cavitation region similar to th.t of experimental visualizations. Additionally, th. backflow cavitation rotates with.th. speed slower th.n th. rotation speed of th. inducer. Th.n, th. rotation of backflow cavitation causes th. periodic fluctuation of th. outlet pressure greater th.n th.t of th. inlet pressure.

关键词： cavitation inducer tip clearance flow numerical analysis

Parametric Study of an Underwater Finned Propulsor Inspired by Bluespotted Ray

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Journal of Bionic Engineering 2012年第2期9卷 166-176页

作者： Yongh.a Zh.ng Jianh.i h. k. h. LOW Department of Mech.tronics Engineering Taizhou Vocational ＆ Technical College Taizhou 318000 P. R. China Sch.ol of Mech.nical and Aerospace Engineering Nanyang Technological University Singapore 639798

Th. performance ofbluespotted rays was emulated in th. design ofa bioinspired underwater propulsor in th. present work. First, th. movement of a live bluespotted ray was captured for th. swimming mode and useful information to th. biomimetic mech.nism design. By virtue of th. modular and reconfigurable design concept, an undulatory fin propulsion prototype was developed. With.a proper experimental set-up, orth.gonal experiments were conducted to investigate th. effect of various fin design parameters on th. propulsion speed, th.ust, and power of th. fish.robot. Th. controllable fin parameters include frequency, amplitude, wavelength. fin sh.pe, and undulatory mode. Th. significance of th.se parameters was also determined by using th. variance analysis. Th. results demonstrate th.t th. designed propulsor, imitating bluespotted rays with.large expanded undulatory fins, is able to propel itself by ch.nging various kinematic parameters.

关键词： biomimetic underwater propulsor bluespotted ray undulatory fin fish.robot parametric study

Design of Finite Element Tools for Coupled Surface and Volume Mesh.s

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Numerical Math.matics(Th.ory,Meth.ds and Applications) 2008年第3期1卷 245-274页

作者： Daniel kster Oliver kriessl kunibert G.Siebert Numerical Analysis and Computational Mech.nics Group University of TwenteP O.Box 2177500 AE EnschedeThe Netherlands. Institut für Math.matik Universitt AugsburgUniversittsstraβe 14D-86159 AugsburgGermany.

Many problems with.underlying variational structure involve a coupling of volume with.surface effects.A straigh.-forward approach.in a finite element discretiza- tion is to make use of th. surface triangulation th.t is naturally induced by th. volume *** an adaptive meth.d one wants to facilitate'match.ng'local mesh.modifications,i.e.,local refinement and/or coarsening,of volume and surface mesh.with.standard tools such.th.t th. surface grid is always induced by th. volume grid. We describe th. concepts beh.nd th.s approach.for bisectional refinement and describe new tools incorporated in th. finite element toolbox *** also present several important applications of th. mesh.coupling.

关键词： Adaptive finite element meth.ds scientific software software design.

Recruitment in species-rich.grasslands: th. effects of functional traits and propagule pressure

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Journal of Plant Ecology 2012年第3期5卷 260-269页

作者： Math.asÖster Ove Eriksson Department of Botany Stockholm UniversitySE-10691 StockholmSweden

Aims Th. assembly of plant communities is a complex process wh.ch.combines impacts from th. species pool,dispersal and propagule pressure,nich. requirements of colonizing species and th. nich. structure of th. *** th.ory development h.s incorporated all th.se aspects,***‘stoch.stic nich. th.ory’.We investigated recruitment into a species-rich.grassland community,using an experimental approach.wh.re we manipulated th. trait composition of th. community and examined th. success of colonizing species entering with.various propagule ***,we examined two predictions:(i)colonization success increases with.increasing difference between traits of th. colonizing species and th. trait profile of th. community and(ii)colonization success increases with.increasing propagule *** Th. examined communities were species-rich.semi-natural grasslands located in south.rn *** a careful documentation of th. composition of th. plant communities at th. experimental sites,we manipulated th. trait profile of species-rich.grassland plots based on th. plant functional trait specific leaf area(SLA),wh.ch.is correlated with.several key life h.story *** addition to SLA,seed mass was also used to describe th. trait profile of grassland *** of 12 plant species from th. regional species pool,varying in SLA and seed mass,were sown into plots using four different levels of propagule *** was examined after 1 *** also planted juvenile‘plug plants’of th. same species wh.ch.allowed us to examine survivorsh.p and growth.beyond th. seedling *** Findings Overall we found very limited evidence for relationsh.ps between th. traits of th. colonizing species and th. trait profile of th. community and for recruitment after sowing th.se relationsh.ps were contrary to th. *** of plug plants after two seasons of growth.was h.gh.irrespective of th. trait profile of th. community,but growth.of plug

关键词： assembly rules recruitment limitation seed size semi-natural grassland SLA