1,720,987 research outputs found
VARIATIONS OF PORE-WATER PRESSURE RESPONSES IN A VOLCANIC SOIL SLOPE TO RAINFALL INFILTRATION
Get PDFABSTRACT A field monitoring of hydrological response and slope movement in an active landslide area, comprising of volcanic soil, was conducted to have a better understanding of the mechanism of landslide reactivation during a rainfall period. Monitoring instruments consisted of jet-fill tensiometers, inclinometers, open stand-pipe piezometers, and a tipping-bucket rain-gauge. The records of pore-water pressure show that the hydrological responses exhibited some spatial variability, and were mainly influenced by antecedent soil moisture conditions and rainfall patterns. The ingress of wetting front was confined up to the depths of 3 m, and a transient positive pore pressure could develop at a depth of 1 m during a heavy rainfall. More sustained increase in pore-water pressure could develop at deeper soil. Meanwhile, the piezometer records show that the response of groundwater table occur more significantly in the middle and lower portions of the slope, associated with the subsurface topographical features. The analysis of antecedent moisture conditions based on the pore-water pressure measurement data indicates that simplified model of slope hydrology cannot fully explain the spatial and temporal development of the pore-water pressures observed in the soil slop
Utjecaj geoloških i oborinskih uvjeta na analizu stabilnosti padina u modeliranju plitkih klizišta korištenjem TRIGRS modela
Get PDFWest Java Province has a high potential for susceptibility to landslides. West Bandung Regency is one of the regions in West Java which has high occurrences of landslides triggered by rainfalls. Rainfall-induced landslides in this region have occurred 165 times during rainfall in the last ten (10) years. An effort to predict the landslide occurrences in this region requires the knowledge of factors affecting the hillslope stability. This paper aims to (1) evaluate the parameters affecting slope stability, (2) determine rainfall characteristics affecting slope, and (3) evaluate the performance of TRIGRS modelling. This study applies a deterministic method using the model of TRIGRS to analyze the effect of one-day antecedent rainfall intensity on the instability of hillslopes. The parameters used in this study are based on field investigation, geological and topographical maps, soil engineering properties, and historical rainfall data. The effect of one-day antecedent rainfall intensity was considered in two scenarios, i.e. 6 hours and 12 hours of antecedent rainfall. Modelling results show that hillslope instability in the study areas is affected by many factors, such as hilly morphology, steep slopes, low shear strength parameters, weathering of volcanic rocks, and the lineament density of geological structures. The modelling simulation also indicates that landslide occurrences in this study area are initiated by a long antecedent rainfall period. Based on ROC analysis, the TRIGRS model shows that the model performance evaluation is in good agreement for modelling slope stability against actual landslide events.Provincija Zapadna Java ima visok potencijal za podložnost klizanju. Regija West Bandung u Zapadnoj Javi područje je s čestom pojavom klizišta koja su izazvana oborinskim događajima. Klizišta inicirana oborinom u istraživanome području dogodila su se 165 puta tijekom posljednjih 10 godina. Predviđanje pojave klizišta u ovoj regiji zahtijeva poznavanje faktora koji utječu na stabilnost padine. Ciljevi su ovoga rada: (1) procijeniti parametre koji utječu na stabilnost padine, (2) odrediti oborinske uvjete koji utječu na stabilnost padine i (3) procijeniti učinkovitost TRIGRS modeliranja. U okviru ovoga istraživanja primijenjena je deterministička metoda korištenjem TRIGRS modela u svrhu analize utjecaja intenziteta jednodnevne oborine koja je prethodila pojavi nestabilnosti na padini. Parametri korišteni u ovome istraživanju temelje se na terenskim istraživanjima, geološkim i topografskim kartama, inženjerskim svojstvima tla te povijesnim podatcima o oborinama. Učinak intenziteta jednodnevne prethodne oborine razmatran je u dvama scenarijima, tj. da je oborina trajala 6 sati i 12 sati. Rezultati modeliranja pokazali su da na stabilnost padina u istraživanome području utječu mnogi čimbenici poput brežuljkaste morfologije, strmih padina, niske posmične čvrstoće materijala, trošenja vulkanskih stijena i gustoće lineamenata geoloških struktura. Rezultati modeliranja također pokazuju da su pojave klizišta u istraživanome području inicirane dugotrajnim prethodnim oborinama. Na temelju ROC analize može se zaključiti kako rezultati TRIGRS modela korišteni u svrhu modeliranja stabilnosti padine dobro koreliraju sa stvarnim pojavama klizišta
Seismic microzonation of soil amplification and liquefaction for Padang City
Get PDFThe magnitude 7.6 MW earthquake that occurred on 30 September 2009 in West Sumatera caused significant damages to buildings in the city of Padang related to the phenomenon of amplification and liquefaction. This paper presents the results of the assessment and mapping of amplification and liquefaction, carried out in the coastal area of Padang City. Mapping of soil amplification was carried out in 250 locations using the HVSR microtremor method. Meanwhile, evaluation of the potential for liquefaction was carried out in 95 locations using a cone penetration test-based method. Based on the analysis, Padang City has five seismic susceptibility zonations. Coastal areas, including the sub-districts of Koto Tangah, North Padang, West Padang, and South Padang, are located in high to very high susceptibility to soil amplification and liquefaction. These results are in agreement with the phenomenon of building damage due to amplification and liquefaction during the 2009 earthquake
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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