Bioaugmentation of Overloaded Anaerobic Digesters Restores Function and Archaeal Community

Adding beneficial microorganisms to anaerobic digesters for improved performance (i.e. bioaugmentation) has been shown to decrease recovery time after organic overload or toxicity upset. Compared to strictly anaerobic cultures, adding aerotolerant methanogenic cultures may be more practical since they exhibit higher methanogenic activity and can be easily dried and stored in ambient air for future shipping and use. In this study, anaerobic digesters were bioaugmented with both anaerobic and aerated, methanogenic propionate enrichment cultures after a transient organic overload. Digesters bioaugmented with anaerobic and moderately aerated cultures recovered 25 and 100 days before non-bioaugmented digesters, respectively. Increased methane production due to bioaugmentation continued a long time, with 50–120% increases 6 to 12 SRTs (60–120 days) after overload. In contrast to the anaerobic enrichment, the aerated enrichments were more effective as bioaugmentation cultures, resulting in faster recovery of upset digester methane and COD removal rates. Sixty days after overload, the bioaugmented digester archaeal community was not shifted, but was restored to one similar to the pre-overload community. In contrast, non-bioaugmented digester archaeal communities before and after overload were significantly different. Organisms most similar to Methanospirillum hungatei had higher relative abundance in well-operating, undisturbed and bioaugmented digesters, whereas organisms similar to Methanolinea tarda were more abundant in upset, non-bioaugmented digesters. Bioaugmentation is a beneficial approach to increase digester recovery rate after transient organic overload events. Moderately aerated, methanogenic propionate enrichment cultures were more beneficial augments than a strictly anaerobic enrichment

El valor de la ley positiva

The article is a reassertion of the intrinsical worth of the most of rules of positive law, issued in an environment of generalized transgression and in opposition to the views which on account of emphasize the value of judge sentences or principles as sources of law, depress the civil laws authority. The classical conception of the rule of law, which not only conceives it as a way for refrain the men, but also affirms its pedagogical function in order to the right behavior and conducive to common good actions is remembered. Respective Aquinas, Holmes, Hart, Raz and Finnis theories about the point are compared. The author deals with the reasonableness in the rules of law contents: There are unreasonable and unjust precepts, and there is a wise and fixed courts of justice doctrine that declares them “inconstitutional” and inapplicable, because of the violation of the “reasonableness principle”; however most of the rules of law are reasonable. Then the author points out two doctrinal causes of the theorical unworthness of the rules of law and its nowadays practical contempt: the idea of the separation between morals and law, and the doctrine that assumes the individual freedom as the greatest human good (as W Goldschmidt taught, among others). Finally, the author dissaproves, under the title “Theories that favourish the judicial disobedience of civil laws”: a) an erroneus thought which in the name of natural law an equity exaggerates the scope of the admissible judge discretion; b) the “judicialist” juridical positivism (Holmes, Ross, Kelsen), which has been the prevailing mode of positivism in the 20th century; c) the abuses of “systemical” interpretation and “constitutionalization” of law, which seek to legitimate the disregarding of the law rules, through pseudo-constitutional interpretations of it; d) the application of false principles instead of the legal precepts.El artículo es una reafirmación del valor intrínseco del contenido de las reglas de la ley positiva en general, elaborado en un ambiente de transgresión generalizada, y frente a concepciones que al acentuar la primacía de la jurisprudencia o de los principios jurídicos como fuentes del Derecho, deprimen la autoridad de las leyes civiles. Se recuerda la concepción clásica que no reduce la ley a su papel represor, sino que también reconoce su función pedagógica de la conducta correcta y de lo conducente al bien común. Se comparan las doctrinas de Tomás de Aquino, Holmes, Hart, Raz y Finnis al respecto. El autor trata de la razonabilidad del contenido de las leyes: Existen preceptos irrazonables e injustos, y hay doctrina tribunalicia acertada y arraigada que las declara “inconstitucionales” e inaplicables por violar el “principio de razonabilidad”; pero la mayoría de las leyes son razonables. Señala luego dos causas doctrinarias de la desvalorización de las leyes y su desprecio práctico en nuestro tiempo: la idea de la separación entre lo moral y lo jurídico, y la doctrina que concibe la libertad individual como el bien máximo del hombre (como enseñara, entre otros, W Goldschmidt). Finalmente, bajo el título “Doctrinas favorables a la desobediencia judicial de las leyes civiles”, el autor desaprueba: a) el iusnaturalismo mal entendido que bajo el nombre de equidad exagera el alcance de la discreción del juez; b) el positivismo jurídico “judicialista” (Holmes, Ross, Kelsen), que ha sido la modalidad de positivismo jurídico predominante en el s. XX; c) el abuso de la interpretación “sistémica” y de la “constitucionalización” del derecho, que ocurre cuando mediante falsas interpretaciones “constitucionales” se pretende legitimar la inobservancia de la ley; y d) la aplicación de falsos principios en sustitución de los preceptos legales

Double Exponential Lower Bound for Telephone Broadcast

Consider the Telephone Broadcast problem in which an input is a connected graph $G$ on $n$ vertices, a source vertex $s \in V(G)$, and a positive integer $t$. The objective is to decide whether there is a broadcast protocol from $s$ that ensures that all the vertices of $G$ get the message in at most $t$ rounds. We consider the broadcast protocol where, in a round, any node aware of the message can forward it to at most one of its neighbors. As the number of nodes aware of the message can at most double at each round, for a non-trivial instance we have $n \le 2^t$. Hence, the brute force algorithm that checks all the permutations of the vertices runs in time 2^{2^{\calO(t)}} \cdot n^{\calO(1)}. As our first result, we prove this simple algorithm is the best possible in the following sense. Telephone Broadcast does not admit an algorithm running in time 2^{2^{o(t)}} \cdot n^{\calO(1)}, unless the \ETH\ fails. To the best of our knowledge, this is only the fourth example of \NP-Complete problem that admits a double exponential lower bound when parameterized by the solution size. It also resolves the question by Fomin, Fraigniaud, and Golovach [WG 2023]. In the same article, the authors asked whether the problem is \FPT\ when parameterized by the feedback vertex set number of the graph. We answer this question in the negative. Telephone Broadcast, when restricted to graphs of the feedback vertex number one, and hence treewidth of two, is \NP-\complete. We find this a relatively rare example of problems that admit a polynomial-time algorithm on trees but is \NP-\complete\ on graphs of treewidth two

Sierra-Monte: importation and exportation of marble

The objective of this master project is to develop a business plan for a marble trading company in Portugal. Sierra-Monte as a new registered company in Portugal is exporting different types of marbles from Portugal to gulf countries. This study is mainly to evaluate all the aspects of marble industry, and how to operate a business in terms of import and export. Moreover, a step-by-step business plan of how to open a start-up company in the same field. Getting to know the customers, and their behaviour, channels of transport, and the revenue streams are some of the items which need to be considered. We will analyze the supply and demand in the market, as well as observing the main activities and resources of the organization. A strategic point of view on marketing plan followed by an operational plan, team management, and finally, an overview on financial aspects. In this thesis, we will focus on the main reasons that make Portugal one of the main potential suppliers in the marble industry. Overall industrial market analysis on the stone products, from the production to end customer and all the related aspects of how to connect the supply and demand from Europe to the Middle East and vice versa in the marble industry.O objetivo deste projeto mestre é desenvolver um plano de negócios para uma empresa de comercialização de mármore em Portugal. A Sierra-Monte como uma nova empresa registada em Portugal exporta diferentes tipos de mármores de Portugal para os países do Golfo. Este estudo tem como objetivo principal avaliar todos os aspectos da indústria do mármore e como operar um negócio em termos de importação e exportação. Além disso, um plano de negócios passo a passo de como abrir uma empresa start-up na mesma área. Conhecer os clientes e seu comportamento, canais de transporte e as fontes de receita são alguns dos itens que precisam ser considerados. Analisaremos a oferta e demanda do mercado, bem como observaremos as principais atividades e recursos da organização. Uma visão estratégica do plano de marketing seguido de um plano operacional, gestão de equipe e, por fim, uma visão geral dos aspectos financeiros. Nesta dissertação iremos centrar-nos nos principais motivos que fazem de Portugal um dos principais potenciais fornecedores da indústria do mármore. Análise geral do mercado industrial dos produtos de pedra, desde a produção até o cliente final e todos os aspectos relacionados de como conectar a oferta e a demanda da Europa ao Oriente Médio e vice-versa na indústria de mármore. Palavras

Assessing the Effect of Working Capital Management on the Profitability of Small Business in Chiro Town, West Hararghe Zone, Ormia Region, Ethiopia

An optimal working capital management is expected to contribute certainly to the profitability of firms. The main purpose of the study was to assess the effect of working capital management on profitability of small business in Chiro town, West Hararghe, Ethiopia. To collect primary data semi-structured questionnaire survey and key informant interview were employed. By using non-probabilistic purposive sampling technique, cross-sectional data were collected from 15 sampled small businesses. The effect of the inventory conversion period, accounts receivable period, accounts payable period and cash conversion cycle on return on asset was analyzed through descriptive statistics, Pearson’s Correlation and linear regression by using SPSS version 20. The result shows that there is positive relationship between accounts receivable period and accounts payable period with profitability of small business. However, inventory conversion period and cash conversion cycle have a negative significant impact on profitability. Keywords: Working capital Management, Small business, Profitability and Ethiopia. DOI: 10.7176/RJFA/11-15-03 Publication date:August 31st 202

Friluftsliv i folkehøgskular : korleis har friluftsliv i folkehøgskular endra seg frå 1980-2012?

Friluftsliv 3.år Bachelor ID3-322 Desember 201

Bioaugmentation For Recovery of Anaerobic Digesters Subjected to Organic Overload

Anaerobic digester upset due to organic overload is common and methods to reduce recovery time would be beneficial. One potential method is bioaugmentation, the addition of an external culture for performance improvement. Methanogenic community structure differs from digester to digester and there may exist a relation between specific methanogenic activity (SMA) and microbial community composition. The research presented herein tested whether there is a relationship between SMA and community structure. Also, the effectiveness of bioaugmentation was tested by hypothesizing that bioaugmenting with a methanogenic, propionate-degrading culture acclimated to small oxygen doses will help rapid recovery of organically overloaded digesters. Fourteen different anaerobic cultures were tested for SMA and microbial community using the mcrA gene and DGGE to establish a relationship between SMA and community structure. The culture with the highest SMA was enriched by feeding 0.17g propionate/L-day and different oxygen doses. The enrichment cultures were used to bioaugment organically overloaded anaerobic digesters. Microbial communities present in bioaugmented, non-bioaugmented and undisturbed control digesters as well as the bioaugmentation culture were analyzed using 16S rDNA. A statistically significant relationship between SMA and community structure could not be established, highlighting the difficulty in establishing activity/community structure relationships. However, the results indicated that there was a relation between SMA and methanogenic community compositions studied. Enriching a culture for 25mgO2/L-day increased its SMA by 29.7%, but higher oxygen doses yielded lower SMA values. Bioaugmentation with this enrichment culture reduced the time required for upset digester effluent to decrease below 1000mgSCOD/L by 114 days (11.4 SRTs) and the time required to reach 25mLCH4/day by 37 days (3.7 SRTs) respectively. Bioaugmented digesters consistently produced lower effluent SCOD and more methane than non-bioaugmented digesters. Bioaugmentation is a promising approach for speeding up recovery of organically overloaded digesters. Bacterial and archaeal communities of the bioaugmented and undisturbed control digesters had similar phylogenetic tree structures (p\u3e0.3), whereas the tree structures of non-bioaugmented and undisturbed control digesters differed significantly (pMethanospirillum hungatei may have caused better performance of bioaugmented digesters

A Social Capital Perspective on the Peace Work of Religious Women

acceptedVersio

On the Parameterized Complexity of Grid Contraction

For a family of graphs ?, the ?-Contraction problem takes as an input a graph G and an integer k, and the goal is to decide if there exists F ? E(G) of size at most k such that G/F belongs to ?. Here, G/F is the graph obtained from G by contracting all the edges in F. In this article, we initiate the study of Grid Contraction from the parameterized complexity point of view. We present a fixed parameter tractable algorithm, running in time c^k ? |V(G)|^{{O}(1)}, for this problem. We complement this result by proving that unless ETH fails, there is no algorithm for Grid Contraction with running time c^{o(k)} ? |V(G)|^{{O}(1)}. We also present a polynomial kernel for this problem

Assessing oral English in secondary school: challenges for novice English teachers.

Mastergradsoppgave i lektorutdanning, Høgskolen i Innlandet, 2019.English: This study investigates how novice teachers of English, at lower and upper secondary level, work with the assessment of oral English. In addition, the study focuses on how the novice teachers perceive their own competence in assessing speaking skills, and how their teacher education has prepared them for assessing oral English. The research findings show that the teachers find it challenging to assess oral English. According to the teachers, there is a lack of a shared understanding of how to assess language abilities. The participants report that the assessment is largely based on the teachers’ subjective opinions. The participants problematize vague and broad competence aims in the curricula that open up for a range of different interpretations. The participants are concerned that the lack of a shared understanding of assessment in oral English can lead to unfair assessment of the students. The teachers report that the training they received during the teacher education was not sufficient for working with assessing oral English. They express uncertainty regarding interpretations of competence aims and criteria, and are generally uncertain of whether or not their assessments are reliable and valid.Norsk: Denne studien undersøker hvordan nyutdannede engelsklærere i ungdomskolen og videregående skole jobber med muntlig vurdering i engelsk. I tillegg fokuserer studien på hvordan lærerne anser egen vurderingskompetanse, og hvordan utdanningen deres har forberedt dem til å vurdere muntlig engelsk. Forskningsfunnene viser at lærerne finner vurdering av muntlig engelsk utfordrende. Lærerne oppfatter at det ikke er noen felles forståelse av hvordan man skal vurdere muntlig engelsk på tvers av skoler i Norge og at vurdering i stor grad er basert på læreres subjektive meninger. Lærerne trekker frem at kompetansemålene i læreplanen er lite konkrete, og at dette åpner for mange ulike tolkninger av kompetansemålene. Urettferdig vurderingspraksis blir trukket frem som den ytterste konsekvensen av manglende felles forståelse for vurdering av muntlig engelsk. Lærerne rapporterer at utdanningen deres i svært liten grad har forberedt dem til å vurdere muntlig engelsk. De forteller om usikkerhet rundt tolkning av kompetansemål og kriterier for kjennetegn på måloppnåelse, og er generelt usikre på om deres vurderinger pålitelige