检索结果-南通市图书馆

Combined Analysis of Cost and Traffic Grooming Policies for Hybrid Networks Under Dynamic Traffic Requests

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2009年第6期14卷 677-684页

作者：曹毅宁 Hao Buchta Erwin Patzak 郑小平张汉一 Department of Electronic Engineering Tsinghua University fraunhofer institute for Telecommunications Heinrich-Hertz-Institut

The benefit of a two-layer hybrid IP/MPLS （multi-protocol label switching） over a wavelength division multiplexing network has been analyzed considering both the cost and different grooming policies. A detailed cost and performance analysis of hybrid networks is done for three different grooming policies. The hybrid network cost is compared with that of an opaque network for equal traffic demand and equal blocking probability of dynamic requests of label switched paths. An algorithm is given to design optimum hybrid nodes for different grooming policies to provide the desired blocking probability for a given number of dynamic connection requests. The results show that all three applied grooming policies （IP layer first, optical layer first, and one hop first） result in lower costs of the hybrid network architecture than for the opaque network. In addition, an adaptive one hop first method is given to improve the best of the applied grooming policies, which limits grooming in heavily loaded hybrid nodes to achieve load balancing. The simulation resuits show that the new policy significantly reduces the overall blocking probability.

关键词： hybrid networks cost analysis traffic grooming dynamic traffic

A Reinforcement Learning approach for the continuous electricity market ofGermany: Trading from the perspective of a wind park operator

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

能源与人工智能(英文) 2022年第2期8卷 67-78页

作者： Malte Lehna Björn Hoppmann Christoph Scholz Renéheinrich fraunhofer institute for Energy Economics and Energy System Technology(IEE) Königstor 5934119 KasselGermany

With the rising extension of renewable energies, the intraday electricity markets have recorded a growingpopularity amongst traders as well as electric utilities to cope with the induced volatility of the energysupply. Through their short trading horizon and continuous nature, the intraday markets offer the abilityto adjust trading decisions from the day-ahead market or reduce trading risk in a short-term notice. Producersof renewable energies utilize the intraday market to lower their forecast risk, by modifying their providedcapacities based on current forecasts. However, the market dynamics are complex due to the fact that thepower grids have to remain stable and electricity is only partly storable. Consequently, robust and intelligenttrading strategies are required that are capable to operate in the intraday market. In this work, we proposea novel autonomous trading approach based on Deep Reinforcement Learning (DRL) algorithms as a possiblesolution. For this purpose, we model the intraday trade as a Markov Decision Process (MDP) and employ theProximal Policy Optimization (PPO) algorithm as our DRL approach. A simulation framework is introducedthat enables the trading of the continuous intraday price in a resolution of one minute steps. We test ourframework in a case study from the perspective of a wind park operator. We include next to general tradeinformation both price and wind forecasts. On a test scenario of German intraday trading results from 2018,we are able to outperform multiple baselines with at least 45.24% improvement, showing the advantage of theDRL algorithm. However, we also discuss limitations and enhancements of the DRL agent, in order to increasethe performance in future works.

关键词： Deep Reinforcement Learning German intraday electricity trading Deep neural networks Markov Decision Process Proximal Policy Optimization Electricity price forecast

Hybrid multi-chip assembly of optical communication engines by in situ 3D nanolithography

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2020年第1期9卷 1340-1350页

作者： Matthias Blaicher Muhammad Rodlin Billah Juned Kemal Tobias Hoose Pablo Marin-Palomo Andreas Hofmann Yasar Kutuvantavida Clemens Kieninger Philipp-Immanuel Dietrich Matthias Lauermann Stefan Wolf Ute Troppenz Martin Moehrle Florian Merget Sebastian Skacel Jeremy Witzens Sebastian Randel Wolfgang Freude Christian Koos institute of Photonics and Quantum Electronics(IPQ) Karlsruhe Institute of Technology(KIT)Engesserstraße 576131 KarlsruheGermany institute for Microstructure Technology(IMT) KITHermann-von-Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany institute for Automation and Applied Informatics(IAI) KITHermann-von-Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany Vanguard Automation GmbH Gablonzer StraBe 1076185 KarlsruheGermany fraunhofer institute for Telecommunications Heinrich Hertz Institute(HHI)Einsteinufer 3710587 BerlinGermany institute of Integrated Photonics(IPH) RWTH AachenSommerfeldstraße 18/2452074 AachenGermany

Three-dimensional(3D)nano-printing of freeform optical waveguides,also referred to as photonic wire bonding,allows for efficient coupling between photonic chips and can greatly simplify optical system *** a key advantage,the shape and the trajectory of photonic wire bonds can be adapted to the mode-field profiles and the positions of the chips,thereby offering an attractive alternative to conventional optical assembly techniques that rely on technically complex and costly high-precision ***,while the fundamental advantages of the photonic wire bonding concept have been shown in proof-of-concept experiments,it has so far been unclear whether the technique can also be leveraged for practically relevant use cases with stringent reproducibility and reliability *** this paper,we demonstrate optical communication engines that rely on photonic wire bonding for connecting arrays of silicon photonic modulators to InP lasers and single-mode *** a first experiment,we show an eight-channel transmitter offering an aggregate line rate of 448 Gbit/s by low-complexity intensity modulation.A second experiment is dedicated to a four-channel coherent transmitter,operating at a net data rate of 732.7 Gbit/s-a record for coherent silicon photonic transmitters with co-packaged *** dedicated test chips,we further demonstrate automated mass production of photonic wire bonds with insertion losses of(0.7±0.15)dB,and we show their resilience in environmental-stability tests and at high optical *** results might form the basis for simplified assembly of advanced photonic multi-chip systems that combine the distinct advantages of different integration platforms.

关键词： communication lithography bonding

Comprehensive evaluation of the metabolic effects of insect meal from Tenebrio molitor *** growing pigs by transcriptomics, metabolomics and lipidomics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2020年第2期11卷 527-544页

作者： Sandra Meyer Denise K.Gessner Maria S.Braune Theresa Friedhoff Erika Most Marcus Höring Gerhard Liebisch Holger Zorn Klaus Eder Robert Ringseis institute of Animal Nutrition and Nutrition Physiology Justus Liebig University GiessenHeinrich-Buff-Ring 26-3235392 GiessenGiessenGermany institute of Clinical Chemistry and Laboratory Medicine University Hospital of RegensburgFranz-Josef-Strauss-Allee 1193053 RegensburgGermany institute of Food Chemistry and Food Biotechnology Justus Liebig University GiessenHeinrich-Buff-Ring 1735392 GiessenGiessenGermany fraunhofer institute for Molecular Biology and Applied Ecology Winchester Str.235394 GiessenGiessenGermany

Background:The hypothesis was tested that insect meal(IM)as protein source influences intermediary metabolism of growing *** test this,30 male,5-week-old crossbred pigs were randomly assigned to 3 groups of 10 pigs each with similar body weights(BW)and fed isonitrogenous diets either without(CON)or with 5%IM(IM5)or 10%IM(IM10)from Tenebrio molitor *** 4 weeks and key metabolic tissues(liver,muscle,plasma)were analyzed using ***:Most performance parameters did not differ across the groups,whereas ileal digestibilities of most amino acids were 6.7 to 15.6%-units lower in IM10 than in CON(P<0.05).Transcriptomics of liver and skeletal muscle revealed a total of 166 and 198,respectively,transcripts differentially expressed between IM10 and CON(P<0.05).Plasma metabolomics revealed higher concentrations of alanine,citrulline,glutamate,proline,serine,tyrosine and valine and a lower concentration of asparagine in IM10 than in CON(P<0.05).Only one out of fourteen quantifiable amino acid metabolites,namely methionine sulfoxide(MetS),in plasma was elevated by 45%and 71%in IM5 and IM10,respectively,compared to CON(P<0.05).Plasma concentrations of both,major carnitine/acylcarnitine species and bile acids were not different across *** of liver and plasma demonstrated no differences in the concentrations of triacylglycerols,cholesterol and the main phospholipids,lysophospholipids and sphingolipids between *** percentages of all individual phosphatidylcholine(PC)and phosphatidylethanolamine(PE)species in the liver showed no differences between groups,except those with 6 double bonds(PC 38:6,PC 40:6,PE 38:6,PE 40:6),which were markedly lower in IM10 than in CON(P<0.05).In line with this,the percentage of C22:6n-3 in hepatic total lipids was lower in IM10 than in the other groups(P<0.05).Conclusions:Comprehensive analyzes of the transcriptome,lipidome and metabolome of key metabolic tissues indicate that partial or complete replacement o

关键词： Animal nutrition Insect meal Lipidome Liver Metabolism Metabolome Pigs Plasma Skeletal muscle Transcriptome

Evolutionary ecology of microsporidia associated with the invasive ladybird Harmonia axyridis

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

Insect Science 2015年第3期22卷 313-324页

作者： Andreas Vilcinskas Henrike Schmidtberg Arnaud Estoup Ashraf Tayeh Benoit Facon Heiko Vogel institute of Phytopathology and Applied Zoology Justus-Liebig-University of Giessen Heinrich-Buff-Ring 26-32 Giessen D-35392 Germany fraunhofer institute for Molecular Biology and Applied Ecology Winchester Strasse 2 Giessen D-35394 Germany UMR 1062 CBGP Inra 34988 Montpellier France Max Planck institute for Chemical Ecology Hans-Knoll-Strasse 8 D-07745 Jena Germany

Invasive species are characterized by the rapid growth and spread of their populations after establishing a foothold in new habitats, and there are now many examples of such species negatively affecting biodiversity and the economy. It is unclear why some species can become successful invaders, whereas most （even if closely related） remain noninvasive. We previously proposed a hypothesis that parasites associated with invading species can promote their invasive success if they are harmless toward the invaders but harmful to their competitors and/or predators in the newly colonized habitat. Here we discuss whether microsporidia that have recently been discovered in the invasive ladybird Harmonia axyridis contribute to its invasive success. We show that all H. axyridis beetles sourced from diverse collection sites all over the world carry abundant microsporidia. This suggests that both native and invasive H. axyridis populations are associated with these tolerated parasites, which were likely to have existed in native populations before expansion rather than being acquired in newly colonized areas. We describe the pathogenesis of the microsporidia during different developmental stages of H. axyridis and we address the possibility that the predation of its infected eggs and larvae by competing native ladybird species may lead to their infection and ultimately to their decline. Finally, we discuss our initial hypothesis： microsporidia that are tolerated by an invasive vector insect can be active against susceptible native competitors and/or predator species.

关键词： Coccinellidae evolutionary ecology Harmonia aryridis innate immunity intraguild predation invasion biology microsporidia

“Macrobot”:An Automated Segmentation-Based System for Powdery Mildew Disease Quantification

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Phenomics 2020年第1期2卷 334-346页

作者： Stefanie Lück Marc Strickert Maximilian Lorbeer Friedrich Melchert Andreas Backhaus David Kilias Udo Seiffert Dimitar Douchkov Leibniz institute of Plant Genetics and Crop Plant Research(IPK) Correnstr.306466 SeelandGermany Physics institute II University of GiessenHeinrich-Buff-Ring 1635392 GiessenGermany Julius Kühn institute for National and International Plant Health Messeweg 11/1238104 BraunschweigGermany fraunhofer institute for Factory Operation and Automation(IFF) Sandtorstr.2239106 MagdeburgGermany

Managing plant diseases is increasingly difficult due to reasons such as intensifying the field production,climatic change-driven expansion of pests,redraw and loss of effectiveness of pesticides,rapid breakdown of the disease resistance in the field,and other *** substantial progress in genomics of both plants and pathogens,achieved in the last decades,has the potential to counteract this negative trend,however,only when the genomic data is supported by relevant phenotypic data that allows linking the genomic information to specific *** have developed a set of methods and equipment and combined them into a“Macrophenomics facility.”The pipeline has been optimized for the quantification of powdery mildew infection symptoms on wheat and barley,but it can be adapted to other diseases and host *** Macrophenomics pipeline scores the visible powdery mildew disease symptoms,typically 5-7 days after inoculation(dai),in a highly automated *** system can precisely and reproducibly quantify the percentage of the infected leaf area with a theoretical throughput of up to 10000 individual samples per day,making it appropriate for phenotyping of large germplasm collections and crossing populations.

关键词： linking pesticides typically

Production of Bio-Phenols for Industrial Application:Scale-Up of the Base-Catalyzed Depolymerization of Lignin

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green and Sustainable Chemistry 2017年第3期7卷 193-202页

作者： Bjorn Roвiger Robert Rover Gerd Unkelbach Daniela Pufky-heinrich fraunhofer Center for Chemical-Biotechnological Processes(CBP) LeunaGermany

Objective of this study was the investigation on the up-scaling of base-catalyzed depolymerization (BCD) of lignin to pilot plant dimension. The cleavage process was carried out in dilute alkaline solution at temperatures up to 340°C and a pressure of 25 MPa in a continuously operated tubular flow reactor with throughputs up to 20 kg/h. Investigations included the proof of the feasibility of the scale-up as well as a parameter study on the cleavage of hardwood Organosolv lignin and softwood Kraft lignin within the established pilot plant. Yields and molecular compositions of the isolated product fractions BCD-oil (liquid phenolic fraction) and BCD-oligomers (solid phenolic fraction) are similar to those described in technical lab scale, showing a good scalability. Here, BCD-oils rich in phenolic monomers such as guaiacol, catechol and/or syringol were obtained with a content of up to 13.3 wt% and 14.5 wt% from Organosolv lignin and Kraft lignin, respectively. Formation of BCD-oligomers strongly depends on temperature and residence times within the reactor.

关键词： Lignin Base-Catalyzed Depolymerization Phenolic Monomers Phenolic Oligomers

Tetranuclear yttrium and gadolinium 2-acetylcyclopentanoate clusters：Synthesis and their use as spin-coating precursors for metal oxide film formation for field-effect transistor fabrication

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2018年第10期36卷 1098-1105页

作者： Elaheh Pousaneh Andrea Preuβ Khaybar Assim Tobias Rüffer Marcus Korb Jana Tittmann-Otto Sascha Hermann Stefan E.Schulz heinrich Lang Technische Universitat Chemnitz Faculty of Natural Sciences Institute of Chemistry Inorganic Chemistry D-09107 Chemnitz Germany Technische Universitiat Chemnitz Center for Mierotechnologies D-09107 Chemnitz Germany fraunhofer institute for Electronic Nano Systems ENAS Technologie-Campus 3 D-09126 Chemnitz Germany

Lanthanide clusters [Ln4（μ3-OH）2（η2-accp）4（（μ-O）-η2-accp）6]（Ln = Y（4）,Gd（5）; accp = 2-acetylcyclopentanoate） are accessible by treatment of [M（NO33·6 H2 O]（M = Y（1）,Gd（2）） with 3 equiv. of Haccp（3） in presence of NaOH. The molecular structures of 4 and 5） in the solid-state are discussed. The thermal behavior of 4 and 5 was studied by TG under Ar and O2, showing multistep decomposition processes. Additionally, DSC studies were carried out under an atmosphere of O2. PXRD measurements of the TG residues confirm the formation of Ln2 ***-coating experiments were carried out with 4 and 5 for Ln2 O3 film deposition on silicon substrates. The layers are smooth, close and are of thicknesses of 18.87±1.13 nm and 25.59 ± 4.55 nm for Ln = Y and Gd, which was evidenced by SEM and EDX studies. Field-effect transistors were successfully fabricated by deposition of carbon nanotubes on top of the Y2 O3 films and formation of palladium contacts by a lift-off procedure. An on/off ratio of more than 4 orders of magnitude is achieved without considerable leakage currents. These results demonstrate the potential use of spin-coated Y2 O3 as a gate dielectric in electronic devices.

关键词： β-Diketonates Yttrium Gadolinium Thermal analysis Spin coating CNT transistor

Front line defenders of the ecological niche!Screening the structural diversity of peptaibiotics from saprotrophic and fungicolous Trichoderma/Hypocrea species

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

Fungal Diversity 2014年第6期69卷 117-146页

作者： Christian R.Rohrich Walter M.Jaklitsch Hermann Voglmayr Anita Iversen Andreas Vilcinskas Kristian Fog Nielsen Ulf Thrane Hans von Dohren Hans Bruckner Thomas Degenkolb Bioresources Project Group Fraunhofer Institute for Molecular Biology and Applied Ecology(IME)Winchesterstrasse 235394 GiessenGermany Department of Systematic and Evolutionary Botany Faculty Centre of BiodiversityUniversity of ViennaRennweg 141030 ViennaAustria Department of Systems Biology Technical University of DenmarkSoltofts PladsBuilding 2212800 Kgs.LyngbyDenmark Interdisciplinary Research Centre for BioSystems Land Use and Nutrition(IFZ)Department of Applied EntomologyInstitute of Phytopathology and Applied Zoology(IPAZ)University of GiessenHeinrich-Buff-Ring 26-3235392 GiessenGermany Biochemistry and Molecular Biology OE 2 Institute of ChemistryTechnical University of BerlinFranklinstrasse 2910587 BerlinGermany Interdisciplinary Research Centre for BioSystems Land Use and Nutrition(IFZ)Department of Food SciencesInstitute ofNutritional ScienceUniversity of GiessenHeinrich-Buff-Ring 26-3235392 GiessenGermany AB SCIEXGermany GmbH Landwehrstrasse 5464293 DarmstadtGermany Danish Emergency Management Agency Universitetsparken 22100 CopenhagenDenmark

Approximately 950 individual sequences of nonribosomally biosynthesised peptides are produced by the genus Trichoderma/Hypocreathat belong to a perpetually growing class of mostly linear antibiotic oligopeptides,which are rich in the non-proteinogenic α-aminoisobutyric acid(Aib).Thus,they are comprehensively named ***,peptaibiotics represent ca.80% of the total inventory of secondarymetabolites currently known from Trichoderma/*** unique membrane-modifying bioactivity results from amphipathicity and helicity,thus making them ideal candidates in assisting both colonisation and defence of the natural habitats by their fungal *** this,reports on the in vivo-detection of peptaibiotics have scarcely been published in the *** order to evaluate the significance of peptaibiotic production for a broader range of potential producers,we screened nine specimens belonging to seven hitherto uninvestigated fungicolous or saprotrophic Trichoderma/Hypocrea species by liquid chromatography coupled to electrospray high resolution mass *** of peptaibiotics found were independently confirmed by analysing the peptaibiome of pure agar cultures obtained by single-ascospore isolation from the *** the nine species examined,five were screened positive for peptaibiotics.A total of 78 peptaibiotics were sequenced,56(=72%)of which are ***,dihydroxyphenylalaninol and O-prenylated tyrosinol,two C-terminal residues,which have not been reported for peptaibiotics before,were found as well as new and recurrent sequences carrying the recently described tyrosinol residue at their *** majority of peptaibiotics sequenced are 18-or 19-residue *** homologies with‘classical representatives’of subfamily 1(SF1)-peptaibiotics argue for the formation of transmembrane ion channels,which are prone to facilitate the producer capture and defence of its substratum.

关键词： HPLC/QTOF-ESI-HRMS Metabolite profiling Peptaibiotics Peptaibols Aib peptides Trichoderma Hypocrea