Search results for "Lag"

Effetti della Modalità di Gestione del Suolo e dell’Avvicendamento Colturale sulla Dinamica delle Popolazioni di Infestanti nel Frumento Duro in Ambi…

2013

Biogas from energy crops--optimal pre-treatments and storage, co-digestion and energy balance in boreal conditions.

2008

The objective of this research was to evaluate the biogas production from crops in boreal conditions, focusing on the optimal pre-treatment and storage methods, co-digestion and energy balance of farm-scale crop based biogas plants. Alkaline treatments offered some potential for improving the methane yield from grass and sugar beet tops. The results show that the CH4 yield of energy crops can be maintained by appropriate ensiling conditions for even after 11 months in ambient conditions. The CH4 yield was best preserved with wet grass mixture without additives. Co-digestion of manure and crops was shown to be feasible with feedstock volatile solids (VS) containing up to 40% of crops. The hi…

Impact of crop species on bacterial community structure during anaerobic co-digestion of crops and cow manure

2008

The bacterial communities in three continuously stirred tank reactors co-digesting cow manure with grass silage, oat straw, and sugar beet tops, respectively, were investigated by 16S rRNA gene-based fingerprints and clone libraries. The analyses revealed both clearly distinct and similar phylotypes in the bacterial communities between the reactors. The major groups represented in the three reactors were Clostridia, unclassified Bacteria, and Bacteroidetes. Phylotypes affiliated with Bacilli or Deltaproteobacteria were unique to the sugar beet and straw reactor, respectively. Unclassified Bacteria dominated in sugar beet reactor while in the straw and grass reactor Clostridia was the domina…

Hydrolysis and microbial community analyses in two-stage anaerobic digestion of energy crops

2007

Aims: The roles of the diverse populations of micro-organisms responsible for biodegradation of organic matter to form methane and carbon dioxide are rudimentarily understood. To expand the knowledge on links between microbial communities and the rate limiting, hydrolytic stage of two-stage biogas production from energy crops, this study was performed. Methods and Results: The process performance. and microbial communities (as determined by fluorescence in situ hybridization) in two separate two-stage batch digestions of sugar beets and grass/clover were studied. The microbial populations developed in the hydrolytic stage of anaerobic digestion of beets and grass/clover showed very few simi…

Two-Stage Anaerobic Digestion of Energy Crops: Methane Production, Nitrogen Mineralisation and Heavy Metal Mobilisation

2006

Energy crops (willow, sugar beet and grass silage) were digested in pilot scale two-stage anaerobic digesters. The specific methane yields obtained were 0.16, 0.38 and 0.39 m3 kg(-1) added volatile solids (VSadded) for willow, sugar beet and grass, respectively, corresponding to yearly gross energy yields of 15, 53 and 26 megawatt-hours (MWh) per hectare. With grass and sugar beets as substrate, 84-85% of the harvestable methane was obtained within 30 days. In pilot scale two-stage digestion of willow and sugar beet, 56 and 85% of the laboratory scale methane yields were obtained, but digestion of grass in two-stage reactors yielded 5% more methane than digestion in laboratory scale complet…

On the Stability and Formation of Pillar[n]arenes: a DFT Study

2021

The increased use of both pillar[5]arenes and pillar[6]arenes, stimulated by increasingly efficient syntheses of both, has brought forward the question as to what drives the intermediates in this Friedel-Crafts ring formation to form a pillar[5]arene, a pillar[6]arene, or any other sized macrocycle. This study sets out to answer this question by studying both the thermodynamics and kinetics involved in the absence and presence of templating solvents using high-end wB97XD/6-311G(2p,2d) DFT calculations.

Catacomba di Villagrazia di Carini. Il cubicolo X20. Ricerche 2008-2013

2014

Il X20 è una camera funeraria quadrangolare preceduta da un dromos che deriva da un preesistente arcosolio bisomo. Al suo interno accoglie 29 sepolture: dodici arcosoli per adulti e per bambini, una tomba a nicchia, due tombe a cassa e quattordici fosse pavimentali. Si è potuto accertare che l’aspetto attuale del cubicolo è il risultato di quattro fasi costruttive. Alla prima fase appartiene la decorazione ad affresco con temi floreali e vegetali, che riveste la parete settentrionale. In un momento successivo l’estensione della camera viene raddoppiata e di fonte all’ingresso si crea una scenografica sistemazione di arcosoli e tombe a cassa; nelle due ultime fasi il pavimento viene interame…

La culture en campagne : de l'atonie à la mobilisation antifasciste. Politique culturelle et débat public en France lors des élections de 2002

2004

International audience; Cet article part de l'absence de débat sur la politique culturelle au cours de la campagne électorale des élections présidentielles et législatives du printemps 2002. Il montre les ressorts de cette atonie, avant d'expliquer le réflexe anti-fasciste qui marque les semaines qui suivent le premier tour des présidentielles et la présence de Jean-Marie Le Pen au second tour. L'analyse de la défaite du candidat socialiste est aussi un moment de remise en cause du modèle français de politique culturelle. Le débat s'estompe vite et ne débouche pas sur la mise en place d'une politique culturelle 'refondée'.

O gulag e a literatura de gulag: um balanço das pesquisas

2017

Resumo: Este artigo apresenta um panorama dos debates historiográficos, antigos e recentes, sobre a literatura produzida no complexo de campos de concentração soviéticos (o "gulag"). São examinados livros, congressos, instituições de pesquisa e organizações de memória dedicadas ao tema. O texto é concluído pela constatação da escassez de pesquisas voltadas às especificidades da literatura do gulag. Abstract: This paper presents an overview of recent and old debates on the literature created in Soviet concentration camp complexes (gulags), and examines books, conferences, research institutions and memory organizations dedicated to the matter. The article concludes with the observation that s…

Glimmering utopias: 50 years of African film

2010

The history of African film began in the 1960s with the independence of the colonies. Despite all kinds of political and economic difficulties, numerous films have been made since then, featuring wide-ranging processes of consolidation, differentiation and transformation which were characteristic of post-colonial sub-Saharan Africa. However, these feature films should not merely be viewed as back references to specifically African problems. The glimmering fictions are imagination spaces. They preserve ideas about how the post-colonial circumstances should be approached. Seen from this perspective, the history of African film may be studied as a history of African utopias. Die Geschichte des…