La construction d'immeubles de grande hauteur reste, malgré les débats qu'elle génère, un projet d'actualité dans de nombreuses villes en France. Fort des expériences passées, nombreux sont les projets se tournant aujourd'hui vers le concept de ville verticale. Ces tours multifonctionnelles, mieux ancrées territorialement et ouvertes au public ont alors pour objectif de mieux s'intégrer dans la ville et de permettre une forme d'urbanité. La mise en œuvre de la mixité à l'échelle du bâtiment, la grande hauteur, ainsi que la recherche de qualité urbaine génèrent de nouvelles contraintes techniques, socio-institutionnelles et territoriales peu étudiées à ce jour. En particulier, la complexification des montages de projet, l'enjeu territorial élargi ainsi que le statut particulier des espaces ouverts au public de la tour provoquent de nouveaux questionnements et enjeux public-privé à la fois spatiaux et organisationnels. Dans ce contexte, comment les tours peuvent-elles contribuer à l'urbanité de la ville contemporaine ? En s'appuyant sur une étude comparative de trois projets de tours mixtes franciliens (Phare, Triangle et Duo), ainsi que sur un état de l'art sur la grande hauteur et le concept d'urbanité, nous proposons une typologie des tours au regard de leur contribution à la ville. En développant une approche dynamique de la dimension urbaine des projets de tours au cours de leur fabrication, nous proposons ensuite un outil d'analyse des «trajectoires de projet» dans le temps. Une corrélation apparaît finalement entre ces trajectoires urbaines et les étapes de leur fabrique, et permet une montée en généralité sur les processus de production des différents idéaux-types de tours et de leur urbanité / Despite a controversial scientific and societal debate, building skyward is experiencing a new rise in French cities. This is reflected in the emergence of new high-rise forms: mixed-use towers and even “vertical cities“. Both are usually conceived as more accessible to the public, more linked to the ground, and more “urban». The implementation of mixed-use, height and urban quality in skyscrapers generates a system of specific technical, social and territorial constraints which are little studied so far. New public-private issues concerning both spatial and organisational considerations are caused by the very complexity of the project, the significant impact of the building on its surroundings, as well as the special status of its privately-owned spaces that are open to the public. In this context how can high-rises be produced and contribute to the urbanity of contemporary cities ? First based on a comparative study of three mixed-use tower projects within the Paris region (Phare, Triangle and Duo), then on a literature review of high-rise buildings and the concept of urbanity, we establish a typology of “urban towers“. These are classified according to their relation and their impact on the city. By developing a new dynamic approach of the urban issue of tower projects during their fabrication, we create an analytical tool which can identify temporal “project trajectories“.Finally, we find a correlation between these project trajectories and the stages of their implementation. This allows us to analyse the production process of each class of tower and their urbanity

Esta tese de doutorado defende a hipótese de que a arquitetura moderna do Centro de São Paulo estabeleceu novas funções para seus pavimentos térreos e garantiu uma relação intensa entre o edifício e o espaço urbano. A produção analisada - construída entre as décadas de 1930 e 1960 vinculava-se diretamente ao novo traçado urbano e à legislação referente ao Plano de Avenidas. Na primeira metade do século XX, iniciou-se a construção de uma nova estrutura urbana nos lotes urbanos próximos à Praça da República, a partir de investimentos governamentais e particulares. A iniciativa privada foi estimulada a construir a paisagem urbana seguindo uma legislação que vinculava a permissão de maiores alturas ao desenho arquitetônico desejado pelo poder público. Nestes termos e considerando os diversos aspectos de transformação urbana da cidade, entre eles um novo traçado urbano e a verticalização do Centro da cidade, é possível afirmar que a escala das novas intervenções influenciou de modo determinante a relação do edifício com a rua e influenciou o aparecimento de novos partidos arquitetônicos. A pesquisa, então, parte da análise dos novos programas urbanos, da legislação existente, dos aspectos culturais da metrópole e dos projetos arquitetônicos de um período de grande relevância na história da cidade de São Paulo, a fim de constatar a relação dos edifícios estudados com o contexto urbano em que se inseriram. / This dissertation reveals how the modern architecture of downtown São Paulo developed new functions for ground floors, setting up an intense relationship between the building and the urban space. The analyzed structures built between the 1930s and 1960s were linked closely with the implementation of the Avenues Plan, with its specific legal provisions and urban plan. The construction of a new urban landscape took place during the first half of the twentieth century in the lots adjacent to the Republic Square, as a result of both public and private investments. Private enterprise was given incentives to respect the urban plan by linking building permits for taller structures with the intended architectural design. The scale of the resulting urban transformation, including the opening and expansion of new roads and the vertical growth of the downtown, influenced decisively the relationship between the street and the edifice and lead to the emergence of new currents in architecture. This dissertation discusses the urban plan, legal provisions, cultural aspects, and architectural projects associated with a period of great importance in the history of São Paulo in order to reveal the essential relationships between individual structures and the broader urban context in which they appeared.

Fossils fuels are highly demanded in everyday life domestically or industrially. Fossil fuels are finite resources and they are rapidly depleting, as such alternative renewable feedstocks are sought to replace fossil fuels. Tall oil from paper processing and cashew nut shell liquid from the cashew nut industry are the two major renewable sources we studied, they are both waste byproducts, and have the potential to be converted into value-added materials. Tall oil from the paper industry mainly contained tall oil fatty acid, and under isomerising methoxycarbonylation with palladium catalyst, dimethyl 1,19-dimethyl nonadecanedioate can be obtained. This difunctional ester, dimethyl 1,19-dimethyl nonadecanedioate, is converted to diols, secondary and primary diamines by a hydrogenation reaction with ruthenium complexes of 1,1,1-tris(diphenylphosphinometyl)ethane (triphos) as catalysts in the presence of water, amine or aqueous ammonia respectively. In the case of aqueous ammonia it is necessary to use a two step reaction via diol to obtain 1,19-diaminononadecane. Diesters, diols and diamines are useful precursors for the synthesis of polyesters and polyamides. Difunctional substrates with 8-19 carbon chains are all tolerated under the reaction conditions and are successfully converted to the corresponding diols and diamines in high yields. Under similar hydrogenation conditions with the same ruthenium catalyst, cyclic products were predominantly produced with decreased chain length. N-heterocycles, which are important building blocks for the synthesis of drug molecules, were formed from the hydrogenation of diesters with 4-7 carbon chains in the presence of an amine. Another polymer precursor, ε-caprolactam, which is the precursor for Nylon 6, is obtained in a reasonable yield from both adipic acid and adipate esters together with aqueous ammonia in the presence of ruthenium catalyst. Cashew nut shell liquid was also converted into useful medical drugs, such as norfenefrine, rac-phenylephrine, etilefrine and fenoprofene in reasonable yields. Most of these drug molecules have been formed from 3-vinylphenol by catalytic hydroxyamination followed by methylation or ethylation. 3-Vinylphenol was synthesised from cardanol by ethenolysis to 3-non-8-enylphenol followed by isomerising ethenolysis, whilst the N-alkylation reactions used methyl or ethyl triflate to avoid dialkylation. Fenoprofene was formed by firstly O-phenylating cardanol then ethenolysis followed by isomerising ethenolysis to form 1-phenoxy-3-vinylbenzene. Methoxycarbonyation followed by hydrolysis formed the final product in good yield. Our methods start from renewable waste materials and avoid unpleasant reagents in the original stoichiometric synthesis of those drugs, for example, cyanide is no longer essential for the synthesis of fenoprofene.

Neste trabalho são discutidos os procedimentos simplificados para a consideração da não linearidade física (NLF) e da não linearidade geométrica (NLG) na análise de edifícios de concreto armado. Deste modo, pretende-se estabelecer o grau de confiabilidade desses processos. Algumas prescrições para redução na inércia dos elementos estruturais são comparadas com os resultados obtidos através de modelos em elementos finitos, permitindo, assim, a avaliação destas prescrições. Um estudo detalhado do parâmetro &#947z, como majorador dos esforços em primeira ordem para a obtenção dos esforços finais em segunda ordem, é efetuada, de modo que se possa estabelecer, de forma mais clara, as vantagens e as limitações deste parâmetro. / This work shows some simplified procedures to consider physical non-linearity (FNL) and geometrical non-linearity (GNL), for reinforced concrete buildings, and discusses its reliability. For FNL, prescriptions for stiffness reduction of structural elements are compared with the results obtained from finite elements analysis, in order to verify its assessment. For GNL, a detailed study of the accuracy of &#947z parameter to evaluate final second order effects is made. The behavior of the parameter along the height of the building and for each effort considered is shown.

Kentucky 31 tall fescue (KY31) infected with the common toxic endophyte strains of Epichloё coenophiala produces toxic alkaloids that improve plant vigor, but cause numerous adverse effects in grazing animals. Researchers developed a variety of KY31 containing an alternative strain of E. coenophiala, termed novel endophyte (NE). Adverse health effects in mares have not been evaluated. Experiments in this thesis tested the hypothesis that the NE pasture does not cause adverse effects typically associated with KY31. Specific aims were to: 1) compare forage ergovaline concentrations between KY31 vs NE pastures; 2) evaluate palmar artery diameters in mares grazing KY31, NE, or orchardgrass-bluegrass (OGBG) pastures; 3) determine mare serum prolactin, estradiol, and progesterone concentrations associated with ingesting each pasture type over time; and 4) measure foaling outcomes, including percentage of live foals, foal birth weights, and foal growth rates. In 2015, six nonpregnant mares grazed KY31, six pregnant mares grazed NE and six pregnant mares grazed OGBG pastures. In 2016, eighteen mares were used; six mares grazed each pasture type. Study results showed that ergovaline did not appear to be produced by NE. Novel endophyte pasture did not have negative effects on palmar artery diameter, reproductive hormones, or foaling outcomes.

The relationship between biodiversity and ecosystem functioning is important in maintaining agroecosystem sustainability. Plant-microbe symbioses, such as exists between the grass tall fescue (Schedonorus arundinaceum) and the asexual fungal endophyte Epichloë coenophiala, can be utilized to enhance agroecosystem functions, such as herbivore resistance. “Novel” E. coenophiala strains that vary in the production of mammal- and insect-toxic compounds have been identified, inserted into tall fescue cultivars, and are planted in pastures globally. Novel fungal endophyte-tall fescue associations may have divergent ecosystem function effects. This study assessed effects of different fescue-endophyte symbiotic combinations on pasture ecosystem function, including aboveground (fescue biomass, plant species richness, alkaloid synthesis, arthropod abundance) and belowground (soil microbial biomass, soil enzyme activity, trace gas fluxes) parameters. Results showed no significant effects of increasing symbiotic diversity within a fescue stand on aboveground measurements, bar arthropod abundance and alkaloid synthesis. Most soil parameters quantified had significant symbiotic diversity effects. For example, soil microbial biomass decreased whereas soil enzyme activity increased with increasing symbiotic diversity. Overall, our results suggested that increasing symbiotic diversity had weak to moderate effects on aboveground processes and stronger effects on certain belowground processes, indicating that symbiotic diversity can impact ecosystem functions and warrants further research.

In general, tall buildings, some of which are termed as &ldquo / skyscrapers&rdquo / , are among the typical and almost unavoidable features of the metropolitan cities. There is a competititive race of constructing higher and higher buildings since the birth of the infamous Home Insurance Building in Chicago which is still considered to be the pioneer of the modern tall buildings. Recently, an efficient service core design is strongly needed and inquired with the increase in height and capacity of tall buildings. Such needs and demands are primarily due to the circulation volume of occupants since height has an adverse effect on the size and capacity of the service core. This thesis investigates the features of service cores that play an important role in the planning considerations of tall building design, and their effect on architectural, structural and sustainable design. Within this context, a classification of service cores based on their location in architectural design is proposed.

University of Macau / Faculty of Science and Technology / Department of Civil and Environmental Engineering

Wood consists not only of cellulose, lignin and hemicellulose but also of so called extractives which includes fats and acids and these components are separated in the mill from the black liquor. These extractives are in the mill denoted as tall oil soap. Tall oil has a large field of applications like chemicals and fuel and as it is produced to the atmosphere if it can replace oil and thus reduce the oil consumption. Tall oil soap is separated from the black liquor in a skimmer and the focus of this thesis was to examine the effect of air injection and the soap layer thickness on the soap separation efficiency in a skimmer. The work was focused on in analyzing the soap content of the inlet and outlet black liquor flow of the skimmer and to detect if an enhancement has been achieved with the two mentioned methods. The reason for the pulp mill to improve the soap separation efficiency was to decrease the risk of foaming and fouling in the evaporator but also to be able to increase the production of tall oil. The air injection gave a 41% improvement of the soap separation efficiency and further improvements are probably possible to achieve. The air injection flow was about 7 l air /m3 liquor in the black liquor feed. The airflow lowers the density of soap, creating a greater difference in density between soap and black liquor and this improves the separation efficiency. A thicker soap layer could increase the likelihood for soap drops to raise and reach the soap-liquor interface, because the soap drops have the tendency to bind with each other and will be separated from the liquor instead of following with the skimmed liquor outlet (fig. i.2). However, this study shows no indication of improvement with thicknesses that exceeds 0,75- 3,5 m which also endanger the skimmer due to overflow from the skimmer or create a short circuit between the in- and the outlet black liquor flow.

The object of this thesis was to study plant community structure, especially in relation to vertebrate herbivory, in an altitudinal gradient in the Fennoscandian mountain chain. A sowing experiment in a high alpine Ranunculus glacialis population showed that seeds germinated better in cleared microsites than under established individuals. This is contrasted with a hypothesis that predicts positive plant-plant interactions in high alpine environments. It was concluded that plant-plant interactions in die studied population varied from neutral to negative, whereas no indications for positive interactions were found. An exclosure experiment in a snow-bed showed that a lemming population consumed 33 % of the available graminoids and 66 % of the mosses from August to June during a population peak. The results shows that grazing needs to be considered as a structuring factor in snow-bed vegetation. The vegetation in exclosures in another snow-bed changed from a graminoid-dominated to a herb-dominated plant community during a long-term (six years) experiment No changes of the same magnitude were seen in a tall herb meadow on a lower altitude. Survival of transplanted adult shoots from the tall herb meadow was equally high in the snow-bed as on the meadow, and germination was also high on bare ground in the snow-bed. Grazing seemed to be a more important structuring factor in the snow-bed than in the more productive tall herb meadow. Raising the grazing pressure during one growing season by introducing microtine rodents into enclosures did not cause any large short-term effects on plant community structure in a tall hob meadow or in a snow-bed. Marked shoots showed that some preferred plant species had a high shoot mortality, but biomass for pooled categories of plants was not significantly affected. It was predicted that the tall herb meadow would be more grazing sensitive than die snow-bed, but productivity on the meadow seemed to be sufficiently high for the plants to compensate for the grazing during the growing season. A greenhouse experiment showed that voles, when grazing freely, have the potential to deplete productive field layer vegetation contrary to predictions from plant defence theories. A nitrogen-based defence did not prevent heavy shoot mortality for toxic tall herbs. / <p>Diss. (sammanfattning) Umeå : Umeå universitet, 1993, härtill 5 uppsatser.</p> / digitalisering@umu.se