1,527 research outputs found
Design Theory Manual For ARMORFORM® Erosion Protection Mats
No full text1.0 Determination Of Forces Generated By Moving Water 1 1.1 Forces Due To Flowing Water 1 1.2 Forces Due To Wave Action 8 2.0 Resisting Forces Provided By Erosion Proteetion 11 2.1 ARMORFORM Mat Characteristics 11 2.2 Resisting Forces On Channel Bottom 12 2.3 Resisting Force On Slopes 17 2.4 Additional Resisting Force Given By Anchors 18 3.0 Design Of ARMORFORM Mat Erosion Proteetion 20 3.1 Mats In Channels With Flowing Water 20 3.2 Proteetion Against Wave Action 22 3.3 Design Charts 28KWP-collectio
Supplemental Material - Author gender and text characteristics in contemporary Swedish fiction
No full textSupplemental Material for Author gender and text characteristics in contemporary Swedish fiction by Mats Dahllöf in Language and Literature</p
Supplemental Material - Author gender and text characteristics in contemporary Swedish fiction
No full textSupplemental Material for Author gender and text characteristics in contemporary Swedish fiction by Mats Dahllöf in Language and Literature</p
Short-chain n-alkanes in benthic mats and mosses from the Larsemann Hills, East Antarctica
No full textVariation in leaf colour (green, red and grey) of mosses and lake benthic mats in Antarctica is often linked to water stress and ultraviolet light (UV-B) exposure. Changes in the abundance of organic compounds, such as pectin and phenols, are associated with mechanisms protecting against desiccation and UV radiation. However, the function of n-alkanes, especially against UV radiation, is rarely examined. Here, gas chromatography–mass spectrometry and Fourier-transform infrared spectroscopy analyses were performed to study the variation in n-alkanes in freshwater lake benthic mats and mosses collected from the Larsemann Hills in East Antarctica. Stable isotopes of organic carbon and nitrogen, environmental DNA characterisation and microscopy-based analyses are used to estimate the presence of cyanobacteria, algae and diatoms in moss and benthic mat consortia. Variation in the short-chain (n-C17 to n-C20) versus long-chain (n-C21 to n-C30) n-alkanes in the mosses and benthic mats with their colour were noted. The research links the relative abundance of short-chain n-alkanes to the UV-B exposure and proposes that Antarctic mosses and benthic mats synthesise short-chain n-alkanes for protection against UV-B.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Sanitary Engineerin
Recycled carbon fibre mats for interlayer toughening of carbon fibre/epoxy composites
No full textExploring routes for the effective use of recycled carbon fibres (rCFs) is critical to close the loop in the life cycle of carbon fibres. This work demonstrated a potential of using rCFs for interlayer toughening of carbon fibre/epoxy composites. Nonwoven mats based on rCFs and commingled rCFs/Polyphenylene-sulfid (PPS) fibres were used to interlay a laminate, aiming to improve the mode-I and mode-II fracture toughness. The experimental results proved significant enhancements in the interlaminar fracture properties upon interleaving, with the rCF/PPS mats exhibiting a more prominent toughening effectiveness than the rCF mats. For example, the maximum increase in mode-I and mode-II fracture initiation energies of the laminates was 51% and 66%, respectively upon interleaving the rCF mats, and 220% and 105%, respectively by adding the rCFs/PPS mats. The fractography analysis proved that the main toughening mechanisms were fibre debonding and pulling-out for the rCF mats and fibre bridging for the commingled rCFs/PPS mats. The differences in the toughening mechanisms resulted in opposite effects of the interlayer/epoxy adhesion to the fracture toughness, i.e. an improved interlayer/epoxy adhesion increased the toughening effectiveness of the rCF mats, but negatively affected the toughening performance of the rCF/PPS mats.Structural Integrity & CompositesAerospace Manufacturing Technologie
Bioremediation of uranium contaminated waters using microbial mats, 2000
No full textMicrobial mats are complex, layered microbial communities dominated by cyanobacteria. Mats have been used successfully in the bioremediation of Pb, Cd, Cu, Zn, and Mn contaminated water. This study investigated the possible removal through reduction of soluble U( VI) present in the ionic complexed form in the presence of highly carbonated waters (240 mg/L) by microbial mats. Mats developed in the Bioremediation Laboratory at Clark Atlanta University were used in batch and water column studies. Preliminary studies showed optimum uranium uptake was produced by a 1:1:1 ratio of whole microbial mats, predominately cyanobacteria, and two bacterial groups isolated from the mats: Rhodospeudomonas and a mixed anaerobe group, dominated by sulfur reducers. X-ray absorption near-edge structure spectroscopy (XANES) revealed U(VI) was reduced to U(IV). Uranium removal rate was dependent on temperature, nutrients available, photosynthetic and reducing conditions, and amount of bacterial material per volume of solution
Remediation of mining water with cyanobacterial mats, 1992
No full textMicrobial mats, stimulated with ensiled grass clippings, have been developed to seguester heavy metals from contaminated water. Mixed populations of photosynthetic and heterotrophic bacteria, dominated by Oscillatoria, spp. were developed for metal tolerance and intergrated into a durable, self sustaining community of microbes attached to ensiled grass. Microbial components of the mat and water column effectively removed a number of toxic metals and metalloids from contaminated water by precipitation in the cell mass. Three applications of mats have been found to be effective in treating metal contaminated water. (1) Ponds with floating mats deposited metals at the surface removing 90 99% of the test metal. (2) Excised mats sequestered various metals from mixed solution (28 mg/1 per month of Cd). (3) Immobilized mats, composed of microbes attached to glass wool, in treatment systems employing flow through baffles and floater balls, removed 85 90% of the test metal
Eyvind Johnson och de svekfulla kvinnorna : Rec. av Mats Tormods doktorsavhandling i litteraturvetenskap vid Umeå universitet<em>Till en berättelse om tröst. Eyvind Johnson omläst</em> (Atlantis förlag, Stockholm 2012)
No full textRec. av Mats Tormods doktorsavhandling i litteraturvetenskap vid Umeå universitet Till en berättelse om tröst. Eyvind Johnson omläst (Atlantis förlag, Sthlm 2012). Recensionen framhäver det förtjänstfulla i att Tormod lyft fram ett antal föga beaktade texter i Eyvind Johnsons författarskap och studerat ett mycket försummat ämne - Eyvind Johnson som kvinnoskildrare - men anmärker på ordrikedomen och det vaga framställningssättet. Frågetecken sätts för användningen av psykoanalytisk metod på avlidna författare. </p
Stability of block mats under flow conditions
No full textBlock mattresses or block mats are, nowadays, very commonly applied as protection in a large range of applications either against flow or wave loads. Specifically, this large range of applications contains offshore pipeline protection and stabilization, erosion and scour protection, protection of embankments and river banks (slope protection). The reason why block mattresses are increasingly used in many applications as protection system is due to the following advantages compared to discrete-unit armour systems such as quarry stone or individually-placed blocks which are the enhanced stability that block mats have because of the virtue of connection between adjacent blocks and their properties of being able to be laid quickly and efficiently even under water.Civil Engineering and GeosciencesHydraulic Engineerin
Till en berättelse om tröst : Eyvind Johnson omläst
No full textThis dissertation is devoted to the Swedish author and Nobel Laureate Eyvind Johnson. The study involves a rereading of his oeuvre and an attempt to reformulate the prevailing picture of the author and his works.The study begins by discussing the image of Johnson, as he portrays himself and as he is viewed and talked about by others: readers, critics and researchers. The discussion leads to an attempt to understand what Foucault calls the author-function, as a web of narrative, internal and external, that of the author, the readers and the critics.Something that Johnson calls “truth” is important for his oeuvre. This is linked to the author’s experience and a duty to present testimony about reality, what Johnson would call documents. This reasoning leads to a discussion of different readings and the potential of cognitive values in fiction, and to an exploration of large and small themes, the general and the particular. Autobiographical texts as well as private correspondence with colleagues and friends are discussed from this perspective.Through studies of forgotten and buried or vanished layers – a method that could be called archaeological – the dissertation examines texts in Johnson’s oeuvre that have received less attention, often neglected or ignored. Early short stories, unsuccessful novels and rejected manuscripts can allow recurrent motifs and themes to stand out more clearly and indicate new ways to read the major canonical works in his oeuvre as well. Such themes are found to be abandonment and homosociality, sexuality and misogyny. Important but hitherto often neglected motifs become keys that open the novels to new, closer interpretations.Central features in the study are analyses of the novels Krilon, Strändernas svall (Return to Ithaca, London/New York 1952) and Några steg mot tystnaden. These particularly concern betrayal and being let down, often staged in a gender context. The dissertation leads up to a discussion of what in Johnsons works is reflections on a male, and ultimately also a human predicament. Different concepts are tested: male tragedy, melancholy, but the analysis finally settles on the term male pessimism.It is not Prometheus that represents Johnson but Sisyphus. One must endure, and perhaps imagine oneself happy. </p
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