1,057 research outputs found
The Gnostic Author of Harold Bloom
No full textČlanak isprva kontekstualizira pojavu tzv. authorship studies koje su nastale kao svojevrsna reakcija na poststrukturalističko (R. Barthes i M. Foucault) redefiniranje autorstva. U taj se kontekst zatim pozicionira Harold Bloom. On je, naime, iz uvjerenja da su poststrukturalističke antihumanističke tendencije pokrenule degenerativne procese, pa u konačnici i rastakanje književnosti u prvi plan svoje književne teorije postavio kanon i autora. Dok se o prvome znatno pisalo, drugo – pitanje autorstva – u studijama o Bloomu uglavnom je zanemareno. Stoga se u članku pozornost pridaje ponajprije Bloomovu tumačenju autora. Nastoji se pokazati da njegovo shvaćanje autorstva (kao, uostalom, i kanona) proizlazi iz gnostičke tradicije (Valentin i Lurija). Autor je za Blooma, zaključuje se, ponajprije genij – onaj koji stvara potaknut „iskrom“, pneumom, božanstvom u dnu vlastita uma, što je zapravo također stanoviti antihumanizam.The article contextualizes at first the occurrence of the so-called authorship studies that arose as a kind of reaction to the post-structuralist (R. Barthes and M. Foucault) redefinition
of authorship. Harold Bloom then positioned himself in this context. Namely, from the belief that post-structuralist anti-humanist tendencies initiated degenerative processes, and ultimately the disintegration of literature, he placed the canon and the author at the forefront of his literary theory. While much has been written about the first term, the second—the question of the authorship—has been mostly neglected in Bloom studies. Therefore, the article focuses primarily on Bloom’s interpretation of the author. The article tries to show that his understanding of authorship (as well as the canon, after all) derives from the Gnostic tradition (Valentin and Luria). For Bloom, the author is, it is concluded, primarily a genius—one who creates inspired by a “spark,” a pneuma, a divinity at the bottom of one’s own mind, which is actually also a certain form of anti-humanism
Coupled productivity and carbon isotope records in the southwest Pacific Ocean during the late Miocene–early Pliocene biogenic bloom
No full textBiogenic components of sediment accumulated at high rates beneath frontal zones of the Indian and Pacific oceans during the late Miocene and early Pliocene. The δ13C of bulk and foraminiferal carbonate also decreased during this time interval. Although the two observations may be causally linked, and signify a major perturbation in global biogeochemical cycling, no site beneath a frontal zone has independent records of export production and δ13C on multiple carbonate phases across the critical interval of interest. Deep Sea Drilling Project (DSDP) site 590 lies beneath the Tasman Front (TF), an eddy-generating jetstream in the southwest Pacific Ocean. To complement previous δ13C records of planktic and benthic foraminifera at this location, late Neogene records of CaCO3 mass accumulation rate (MAR), Ca/Ti, Ba/Ti, Al/Ti, and of bulk carbonate and foraminiferal δ13C were constructed at site 590. The δ13C records include bulk sediment, bulk sediment fractions (<63 µm and 5–25 µm), and the planktic foraminifera Globigerina bulloides, Globigerinoides sacculifer (with and without sac), and Orbulina universa. Using current time scales, CaCO3 MARs, Ca/Ti, Al/Ti and Ba/Ti ratios are two to three times higher in upper Miocene and lower Pliocene sediment relative to overlying and underlying units. A significant decrease also occurs in all δ13C records. All evidence indicates that enhanced export production – the ‘biogenic bloom’ – extended to the southwest Pacific Ocean between ca. 9 and 3.8 Ma, and this phenomenon is coupled with changes in δ13C – the ‘Chron C3AR carbon shift’. However, CaCO3 MARs peak ca. 5 Ma whereas elemental ratios are highest ca. 6.5 Ma; foraminiferal δ13C starts to decrease ca. 8 Ma whereas bulk carbonate δ13C begins to drop ca. 5.6 Ma. Temporal discrepancies between the records can be explained by changes in the upwelling regime at the TF, perhaps signifying a link between changes in ocean–atmosphere circulation change and widespread primary productivity
The decline process and major pathways of Microcystis bloom in Taihu Lake, China
No full textEutrophication has become a serious concern in many lakes, resulting in cyanobacterial blooms. However, the mechanism and pathways of cyanobacteria decline are less understood. To identify and define the growth and decline of Microcystis blooms in Taihu Lake of China, and to illuminate the destination of surface floating blooms, we investigated the biomass distribution and variations in colony size, morphology, and floating velocity from October 2008 to September 2009. The results showed that the Microcystis bloom declined in response to biomass decrease, colony disaggregation, buoyancy reduction, and increased phytoplankton biodiversity, and these indicative parameters could be applied for recognition of the development phases of the bloom. Three major decline pathways were proposed to describe the bloom decline process, colony disaggregation (Pathway I), colony settlement (Pathway II), and cell lysis in colonies (Pathway III). We proposed a strategy to define the occurrence and decline of Microcystis blooms, to evaluate the survival state under different stress conditions, and to indicate the efficiency of controlling countermeasures against algal blooms.Eutrophication has become a serious concern in many lakes, resulting in cyanobacterial blooms. However, the mechanism and pathways of cyanobacteria decline are less understood. To identify and define the growth and decline of Microcystis blooms in Taihu Lake of China, and to illuminate the destination of surface floating blooms, we investigated the biomass distribution and variations in colony size, morphology, and floating velocity from October 2008 to September 2009. The results showed that the Microcystis bloom declined in response to biomass decrease, colony disaggregation, buoyancy reduction, and increased phytoplankton biodiversity, and these indicative parameters could be applied for recognition of the development phases of the bloom. Three major decline pathways were proposed to describe the bloom decline process, colony disaggregation (Pathway I), colony settlement (Pathway II), and cell lysis in colonies (Pathway III). We proposed a strategy to define the occurrence and decline of Microcystis blooms, to evaluate the survival state under different stress conditions, and to indicate the efficiency of controlling countermeasures against algal blooms
Algal Bloom Forecasting using Remote Sensing: Discovering the most predictive data modalities for Algal Bloom Forecasting
No full textAn algal bloom is defined as a rapid increase in common algae (phytoplankton) abundance in water bodies and it can occur when a group of certain environmental factors is combined. If the algae populations grow out of control, such algal blooms become problematic and cause damage to the ecosystem, such phenomena are called harmful algal blooms. For this reason, it is important to detect and forecast these phenomena to be able to take action beforehand. Remote sensing is measuring and monitoring the characteristics of an area at a distance and it is typically done by satellites. Remote sensed data containing various environmental measurements can be used as the input for a machine learning system to estimate chlorophyll-a concentrations which is the main indicator used for detecting algal blooms. The main question this research aims to answer is: Which input modality is the most predictive for estimating chlorophyll-a concentrations for water bodies in Uruguay? This research presents the step-by-step construction of a system to pre-process the environmental data collected through remote sensing and use this data to train and test a machine learning system to assess and compare 11 different environmental factors or so-called data modalities individually against each other to find out the most predictive one. Carrying out the machine learning experiments brings the results into the open that radiation mean and turbidity of water are the two most predictive data modalities for algal bloom forecasting with accuracy scores of approximately 34%, while radiation mean is performing slightly better.CSE3000 Research ProjectComputer Science and Engineerin
MBF: a real matrix bloom filter representation method on dynamic set
No full textBloom Filter is a simple space-efficient randomized data structure for representing a set in order to support membership queries, which uses an m-bit array to represent a data set. In order to support representing dynamic set, dynamic bloom filter (DBF) and split bloom filter (SBF) have been developed Both DBF and SBF can support concisely representation and approximate membership queries of dynamic set instead of static set. SBF declares that it uses an s Xm bit matrix that consists of s bloom filters to represent a dynamic set, so DBF dose. But in fact, both the two bloom filters are not matrix representation method at all. They are just a set of s bloom filters whose length is in, and they have got a departure from the original idea of bloom filter: the constant query time cost. This paper points out the fact, and then introduce a truly matrix representation method of bloom filter to represent a dynamic set. We call it the Matrix Bloom Filter (MBF). Then, we will analysis the algorithm of MBF and study the average time complexity and the false positive probability.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000251390000125&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Computer Science, Hardware & ArchitectureComputer Science, Theory & MethodsEngineering, Electrical & ElectronicCPCI-S(ISTP)
The Late Miocene‐Early Pliocene Biogenic Bloom in the Eastern Equatorial Pacific: New Insights From Integrated Ocean Drilling Program Site U1335
No full textThe late Miocene-early Pliocene “biogenic bloom” (BB) manifests as greatly enhanced biogenic sedimentation in sites along the Equator that has been linked to cooler sea surface temperature (SST) in the eastern equatorial Pacific (EEP). However, the full extent and geometry of the BB in the EEP is less known. To improve on this, we have generated new carbonate content (CaCO3%) and bulk carbonate stable isotope (δ13C and δ18O) records spanning the last 7 Ma at IODP Site U1335, located ca. 5° north of the Equator and to the west of the EEP. Site U1335 δ13C and δ18O records display high-frequency variations coupled to changes in sediment composition and physical properties comparable to patterns seen at on-Equator sites further east. During the late Miocene and the early Pliocene bulk δ18O is higher at Site U1335 compared to two off-Equator sites further east, suggesting cooler SSTs generated by stronger equatorial upwelling reaching northwest of the modern core-equatorial upwelling belt. Enhanced upwelling at Site U1335 is supported by relatively higher sedimentation rates prior to 4.6 Ma, symptomatic of higher biological production during the BB. These observations suggest that during the BB the equatorial upwelling circulation was more focused and less parallel to the Equator compared to present day. </p
Optimized Hash Lookup for Bloom Filter Based Packet Routing
No full textAs an efficient data structure for membership testing, the Bloom filter has found wide applications in modern day data networks, including high-speed packet routing for IP-based networks as well as future data-centric networks. In packet routing, Bloom filters are mainly used to pre-process incoming routing queries so as to minimize unnecessary lookups in the main routing table, as the latter is normally stored in slow off-chip memory in the form of a hash table due to its large size. In this paper an optimized hash lookup scheme is proposed to utilize the preceding Bloom filter for better forwarding performance and usability. With the help of a 'summary vector', internal hash calculations of the Bloom filter are reused in the operations of the routing table to get fast single-access table lookup. Compared with previous work, our scheme achieves improved space efficiency, less calculation overhead, more deterministic lookup performance, and simpler update procedures. The performance of our scheme is confirmed by simulations.Computer Science, Hardware & ArchitectureComputer Science, Information SystemsEICPCI-S(ISTP)
Bioaccumulation of microcystins in two freshwater gastropods from a cyanobacteria-bloom plateau lake, Lake Dianchi
No full textTo investigate the bioaccumulation patterns of microcystins (MCs) in organs of two gastropods, samples were collected in Lake Dianchi monthly from May to October, 2008, when cyanobacteria typically bloom. The average MCs concentrations for Radix swinhoei (pulmonate) and Margarya melanioides (prosobranch) tended to be similar for the different organs: the highest values in the hepatopancreas (9.33 by 3.74 mu g/g DW), followed by digestive tracts (1.66 by 3.03 mu g/g DW), gonads (0.45 by 1.34 mu g/g DW) and muscles (0.22 by 0.40 mu g/g DW). Pulmonate had higher value than prosobranch because of the stronger bioaccumulation ability in hepatopancreas. The levels in organs of R. swinhoei were correlated with environmentally dissolved MCs, but influenced by intracellular MCs for M. melanioides. The estimated MCs concentrations in edible parts of M. melanioides were beyond the WHO's provisional tolerable daily intake (0.04 mu g/kg), suggesting the risk of consumption of M. melanioides from the lake. (C) 2012 Elsevier Ltd. All rights reserved.To investigate the bioaccumulation patterns of microcystins (MCs) in organs of two gastropods, samples were collected in Lake Dianchi monthly from May to October, 2008, when cyanobacteria typically bloom. The average MCs concentrations for Radix swinhoei (pulmonate) and Margarya melanioides (prosobranch) tended to be similar for the different organs: the highest values in the hepatopancreas (9.33 by 3.74 mu g/g DW), followed by digestive tracts (1.66 by 3.03 mu g/g DW), gonads (0.45 by 1.34 mu g/g DW) and muscles (0.22 by 0.40 mu g/g DW). Pulmonate had higher value than prosobranch because of the stronger bioaccumulation ability in hepatopancreas. The levels in organs of R. swinhoei were correlated with environmentally dissolved MCs, but influenced by intracellular MCs for M. melanioides. The estimated MCs concentrations in edible parts of M. melanioides were beyond the WHO's provisional tolerable daily intake (0.04 mu g/kg), suggesting the risk of consumption of M. melanioides from the lake. (C) 2012 Elsevier Ltd. All rights reserved
Pennate diatom Nitzschia pungens as the primary source of domoic acid, a toxin in shellfish from eastern Prince Edward Island, Canada
No full textAn outbreak of food poisoning in Canada during autumn 1987 was traced to cultured blue mussels (Mytilus edulis ) from the Cardigan Bay region of eastern Prince Edward Island (P.E.I.). The toxin, identified as domoic acid, had not previously been found in any shellfish and this outbreak represents the first known occurrence of human poisoning by this neurotoxin. A plankton bloom at the time of the outbreak consisted almost entirely of the pennate diatom, Nitzschia pungens f. multiseries , and a positive correlation was found between the number of N. pungens cells and the concentration of domoic acid in the plankton. The authors conclude that N. pungens was the major source of the domoic acid in toxic mussels in eastern P.E.I. The recurrence, in November 1988, of a monospecific bloom of N. pungens and the presence of domoic acid in plankton and mussels reinforced this conclusion.32 ref.Source type: Electronic(1
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