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Search Results: 1 - 10 of 3348 matches for " Tania; Fontugne "
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Quebrada de los burros: Los primeros pescadores del litoral pacífico en el extremo sur peruano
Lavallée,Danièle; Julien,Michèle; Béarez,Philippe; Bola?os,Aldo; Carré,Matthieu; Chevalier,Alexandre; Delabarde,Tania; Fontugne,Michel; Rodríguez-Loredo,Cecilia; Klaric,Laurent; Usselmann,Pierre; Vanhaeren,Marian;
Chungará (Arica) , 2011, DOI: 10.4067/S0717-73562011000300002
Abstract: research works at quebrada de los burros evidenced an archaic settlement on the littoral of tacna (peru). this campsite of fishermen and shell-gatherers (qlb) has been occupied during early and middle holocene, between 10,000 and 6,000 bp. broad horizontal excavations revealed six successive occupation levels, with living floor layouts, hearths, specialized activity areas and accumulations of food waste of marine origin mixed with bones of terrestrial fauna. as a whole, these remains indicate that, since the beginning, the inhabitants relied intensively on ocean resources but they also exploited the lomas. lithic tools and bone instruments attest a sophisticated equipment for fishing, gathering and hunting. two phases of occupation were characterized, the first during early holocene (ca. 10,000 to 7,000 bp), the second during middle holocene (ca. 7,000 to 6,000 bp). the analyses suggest, for the first phase, a succession of short occupations and possible contacts with high lands and, on the contrary, a more intensive occupation, nearly all the year round, for the second, during which raw lithic materials came from nearby areas. a close relation with chilean sites chinchorro is confirmed.
A Visualization Tool for Exploring Multi-scale Network Traffic Anomalies
Romain Fontugne,Toshio Hirotsu,Kensuke Fukuda
Journal of Networks , 2011, DOI: 10.4304/jnw.6.4.577-586
Abstract: Since anomaly detection in Internet traffic is a crucial and unmet challenge, many anomaly detectors for backbone traffic have recently been proposed. However, evaluating anomaly detectors is a complicated task due to the lack of ground truth data. Our goal is to provide a good level of support for rapidly understanding traffic behaviors and assisting researchers in evaluating the effectiveness of anomaly detectors. This article presents an interactive tool that takes advantage of several graphical representations highlighting the different aspects of network traffic and anomalies. The proposed tool allows for exploration of network traffic at any temporal and/or spatial (address and port) scales. In addition, an accurate description of any subtraffic is available in the form of textual packet information, enabling complete understanding of the monitored traffic. We exhibit the effectiveness of the proposed tool by analyzing darknet traffic, backbone traffic, and anomalies reported by an anomaly detector. We illustrate a manual validation of the anomalous traffic reported by anomaly detectors, and inspect a recent and sophisticated threat: the Conficker worm. We also state several typical patterns that stand for different kinds of anomalies.
Paleohydrology reconstruction and Holocene climate variability in the South Adriatic Sea
G. Siani, M. Magny, M. Paterne, M. Debret,M. Fontugne
Climate of the Past (CP) & Discussions (CPD) , 2013,
Abstract: Holocene paleohydrology reconstruction is derived combining planktonic and benthic stable oxygen and carbon isotopes, sea surface temperatures (SSTs) and oxygen isotope composition of seawater (δ18Ow) from a high sedimentation core collected in the South Adriatic Sea (SAS). Core chronology is based on 10 AMS 14C measures on planktonic foraminifera and tephra layers. Results reveal two contrasted paleohydrological periods that reflect (i) a marked lowering of δ18Ow/salinity during the early to mid-Holocene (11.5 ka to 6.3 ka), including the two-step sapropel S1 deposition, followed during the mid- to upper Holocene by (ii) a prevailing period of increased salinity and enhanced arid conditions in the South Adriatic Basin. Superimposed on these trends, short-term centennial-scale hydrological events punctuated the Holocene period in the SAS. During the early to mid-Holocene, two main SST coolings together with prominent δ18Ow/salinity lowering delineate the sapropel S1 interruption and the post-sapropel phase between 7.3 to 6.3 ka. After 6 ka, centennial-scale δ18Ow and G. bulloides δ13C lowering, mostly centered between 3 to 0.6 ka, reflect short-term hydrological changes related to more intensive runoff of the Po and/or Apennine rivers. These short-term events, even of lesser amplitude compared to the early to mid-Holocene period, may have induced a lowering of sea surface density and consequently reduced and/or inhibited the formation of deep bottom waters in the SAS. Comparison of the emerging centennial- to millennial-scale hydrological record with previous climatic records from the central Mediterranean area and north of the Alps reveal possible synchronicities (within the radiocarbon-dating uncertainty) between phases of lower salinity in the SAS and periods of wetter climatic conditions around the north-central Adriatic Sea. Finally, wavelet analyses provide new clues about the potential origin of climate variability in the SAS, confirming the evidence for a mid-Holocene transition in the central Mediterranean climate and the dominance of a ~1670-yr periodicity after 6 ka, reflecting a plausible connection with the North Atlantic climate system.
Track Paging an Optimal Method for Minimizing Paging and Signaling Cost in Mobile IP  [PDF]
Tania Baghaie
Journal of Computer and Communications (JCC) , 2013, DOI: 10.4236/jcc.2013.14002
Abstract:

Mobile IP is an Internet standards protocol, which enhances the existing Internet Protocol (IP) to accommodate mobility. In mobile IP protocol, to find the exact location of mobile node for transferring incoming packets to them has a lot of signaling cost. So increasing the performance and decreasing the signaling cost are challenges of this protocol. Using the paging mechanism, its operation is in such a way that it can reduce Relocation update cost and save on power consumption in a mobile node. In addition, it can improve the performance of network by decreasing the need to register an idle mobile node. Mobile IP, currently does not support paging. Therefore, after introducing the mobile IP protocol and reporting related works, this paper will try to introduce a way to add paging support to the Mobile IP. Track paging is proposed to reduce the number of registration message of an idle mobile node to the mobile node’s home agent by waiving broad casting method and paging area size. Analytical results show that Track paging can significantly improve the total signaling cost of MIP vs. previous methods. Results also show that specifying the optimal paging area is critical in saving signaling cost of a MIP with paging support.

Estabilidad y rupturas dinámica en el Holoceno de la costa surperuana: el valle de La Quebrada de los burros (departamento de Tacna)
Usselmann, Pierre,Fontugne, Michel,Lavallée, Danièle,Julien, Michèle
Bulletin de l'Institut Francais d'études Andines , 1999,
Abstract: STABILITé ET RUPTURES DYNAMIQUES DE L HOLOCèNE DE LA C TE SUD-PéRUVIENNE : LA VALLéE DE LA QUEBRADA DE LOS BURROS (DéPARTEMENT DE TACNA). L examen et la datation des dép ts sédimentaires conservés le long de la Quebrada de los Burros (département de Tacna, Pérou), précisent la connaissance des variations climatiques et dynamiques de la période 8500-3200 BP. Deux épisodes à laves torrentielles, violents et certainement brefs, encadrent une longue période nettement plus calme durant laquelle se sont déposés des sédiments fins, parfois organiques, contemporains de la présence d installations humaines. El estudio y la datación de los sedimentos depositados a lo largo de la Quebrada de los Burros (departamento de Tacna, Perú), permiten un buen conocimiento de las variaciones climáticas y dinámicas del periodo 8500-3200 BP. Dos episodios con lavas torrenciales, violentos y seguramente breves, encajan en un largo periodo nítidamente más tranquilo, donde se depositan sedimentos finos, a veces orgánicos, contemporáneos de la presencia de instalaciones humanas. HOLOCENIC STABILITY AND BREAKS IN THE SOUTHERN PERUVIAN COAST: THE QUEBRADA DE LOS BURROS VALLEY (DEPARTMENT OF TACNA). Radiocarbon measurements of organic sedimentary deposits from the Quebrada de los Burros (Department of Tacna, Peru) permit the reconstruction of climate dynamics during the mid-Holocene (3200-8500 years BP).Two short debris flow events marks the beginning and the end of period of fine grain sedimentation processes. This period is contemporaneous with the presence of human settlements in the Quebrada.
CuradermBEC5 for Skin Cancers, Is It? An Overview  [PDF]
Tania Robyn Chase
Journal of Cancer Therapy (JCT) , 2011, DOI: 10.4236/jct.2011.25099
Abstract: Skin cancer incidence is increasing at alarming rates and is considered by some as an epidemic. Its incidence is higher than all other cancers combined. The developments of new treatments have not parallelled the increased incidences of this disease. A variety of treatments are available with differing outcomes. More recently a novel topical treatment, consisting of the antineoplastic compounds solasodine rhamnosyl glycosides, solamargine and solasonine, which are derived from plant material, has been described that claims to have many advantages over the currently used skin cancer therapies. This review investigates such claims.
The Triple Differential Cross Sections for Electron Impact Ionization of Metastable 3s State Hydrogen Atoms with Exchange Effect  [PDF]
Tania Noor, Sunil Dhar
Open Journal of Microphysics (OJM) , 2017, DOI: 10.4236/ojm.2017.73004
Abstract:
A final state wave function of multiple scattering theory developed by Das and seal is utilized in the present study to calculate the triple differential cross sections (TDCS) for the ionization of metastable 3S state hydrogen atoms at incident electron energy of 250 eV with the exchange effects in the asymmetric coplanar geometry for various kinematic conditions. Our present calculation results are compared with the available hydrogenic ground state experimental data and other existing theoretical results. A good qualitative agreement is shown with those of compared results of the present study specifically with hydrogenic ground state experimental data and metastable 2S and 2P state with exchange effect results. These new results offer an extensive scope for experimental verification in such ionization process.
Heavy Metals, Metalloids, Their Toxic Effect and Living Systems  [PDF]
Ferdous Seraj, Tania Rahman
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.913191
Abstract: Pollution of the biosphere by heavy metals is a global hazard that has accelerated since the beginning of the industrial revolution. Toxic heavy metals are harmful to living organisms even at low concentrations whereas heavy metals that are essential trace elements are required by plants at low concentrations but can become toxic at high concentrations. Heavy metals released from different sources accumulate in soil and, where bioavailability is high enough; can adversely affect soil biological functioning and other properties, leading to the loss of soil and ecosystem fertility and health. It is important that heavy metal contaminated sites are remediated as heavy metals do not decompose into less harmful substances like organic contaminants, and thus are retained in the soil. In this review, we survey and analysis our current knowledge and understanding of the abundance of heavy metals in soil, their phytoavailability, their toxicity, their uptake and transport, role of rhizobia and other microbes and overall rhizosphere processes.
Western equatorial African forest-savanna mosaics: a legacy of late Holocene climatic change?
A. Ngomanda, A. Chepstow-Lusty, M. Makaya, C. Favier, P. Schevin, J. Maley, M. Fontugne, R. Oslisly,D. Jolly
Climate of the Past (CP) & Discussions (CPD) , 2009,
Abstract: Past vegetation and climate changes reconstructed using two pollen records from Lakes Maridor and Nguène, located in the coastal savannas and inland rainforest of Gabon, respectively, provide new insights into the environmental history of western equatorial African rainforests during the last 4500 cal yr BP. These pollen records indicate that the coastal savannas of western equatorial Africa did not exist during the mid-Holocene and instead the region was covered by evergreen rainforests. From ca. 4000 cal yr BP a progressive decline of inland evergreen rainforest, accompanied by the expansion of semi-deciduous rainforest, occurred synchronously with grassland colonisation in the coastal region of Gabon. The contraction of moist evergreen rainforest and the establishment of coastal savannas in Gabon suggest decreasing humidity from ca. 4000 cal yr BP. The marked reduction in evergreen rainforest and subsequent savanna expansion was followed from 2700 cal yr BP by the colonization of secondary forests dominated by the palm, Elaeis guineensis, and the shrub, Alchornea cordifolia (Euphorbiaceae). A return to wetter climatic conditions from about 1400 cal yr BP led to the renewed spread of evergreen rainforest inland, whereas a forest-savanna mosaic still persists in the coastal region. There is no evidence to suggest that the major environmental changes observed were driven by human impact.
Presentation of a Validated Checklist as a Tool for Assessing, Preventing and Managing Food Waste in Foodservices  [PDF]
Tania Regina Kinasz, Regina Baptista Reis, Tania Beninga Morais
Food and Nutrition Sciences (FNS) , 2015, DOI: 10.4236/fns.2015.611102
Abstract: More researches are needed to identify the relevant factors influencing the generation of food waste and devise preventive strategies. The objective of this study is to develop a checklist to assess the good management practices that have a positive impact on eliminating or minimizing food waste in food service units. A theoretical list of relevant factors impacting the generation of food waste during meal production is developed, taking into account administrative planning, receipt and storage of foods, and the preparation and distribution of meals by food service units. For each factor, several administrative and/or technical actions are identified. To validate the content, this list is submitted to a ten-member expert panel for a final evaluation. The factor (and its respective actions) is considered relevant if 80% of the expert panel members agree on its relevance. All actions employ a dichotomous response of Yes/No. Affirmative responses are expected because these actions are considered to be good management practices that have a positive impact on eliminating or minimizing food waste. Following the panel approval process, a checklist of 12 factors and 102 actions is detailed. The conceptual structure of the checklist for food waste management presented in this study enables a comprehensive understanding of the factors that impact food waste, providing a theoretical basis for future research into the relative importance of the relevant factors and actions identified in this study.
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