197,062 research outputs found
A model of contingency detection to spot tutoring behavior and respond to ostensive cues in human-robot-interaction
No full textLohan KS. A model of contingency detection to spot tutoring behavior and respond to ostensive cues in human-robot-interaction. Bielefeld: Universitätsbibliothek; 2011
Matlab-based example of a Double Binary Offset Carrier modulation
No full text<p>The Example_BOC.m file shows a basic example of a sine-BOC modulated pseudorandom code and compares its autocorrelation function with the ideal autocorrelation function derived based on the Double Binary Offset carrier (DBOC) modulation concept described in:</p>
<p>Lohan, E. S., A. Lakhzouri, and M. Renfors. 2007. "Binary-Offset-Carrier Modulation Techniques with Applications in Satellite Navigation Systems." <em>Wireless Communications and Mobile Computing</em> 7 (6): 767-779. doi:10.1002/wcm.407.</p>More details can also be found here:
Lohan, E. S., A. Lakhzouri, and M. Renfors. 2006. "Complex Double-Binary-Offset-Carrier Modulation for a Unitary Characterisation of Galileo and GPS Signals." IEE Proceedings: Radar, Sonar and Navigation 153 (5): 403-408. doi:10.1049/ip-rsn:20060005
Las formaciones La Amarga y Lohan Cura (Cretácico temprano) en el depocentro de Picún Leufú
No full textSe analizan las sedimentitas del Cretácico Inferior en el sector meridional de la Cuenca Neuquina (Depocentro de Picún Leufú) comprendidas entre los Grupos Mendoza y Neuquén. Teniendo en cuenta estas relaciones estratigráficas ellas son consideradas integrantes del Grupo Bajada del Agrio. Este intervalo estratigráfico está compuesto por la Fm. La Amarga (Mbs. Puesto Antigual, Bañados de Caichigüe y Piedra Parada) y la Fm. Lohan Cura (Mbs. Puesto Quiroga y Cullín Grande). La Fm. La Amarga se atribuye al Barremiano Tardío – Aptiano Temprano, y la Fm. Lohan Cura al Aptiano Tardío – Albiano.The La Amarga and Lohan Cura formations (Early Cretaceous) in the Picún Leufú depocentre.- The continental Early Cretaceous beds cropping out in the southern part of the Neuquén Basin (Picún Leufú Depocentre) comprised between the Mendoza and Neuquén Groups, are analyzed in this paper. Taking into account these stratigraphic relationships, they are considered as forming part of the
Bajada del Agrio Group. This stratigraphic interval is composed by the La Amarga Formation (Puesto Antigual, Bañados de Caichigüe y Piedra Parada Members) and the Lohan Cura Formation (Puesto Quiroga y Cullín Grande Members). The La Amarga Fm. is adcribed to the Late Barremian – Early Aptian, and the Lohan Cura Fm. to the Late Aptian - Albian.Fil: Leanza, Héctor A. Servicio Geológico Minero Argentino; Argentina.Fil: Leanza, Héctor A. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Hugo, Carlos A. Independiente; Argentina.Fil: Vallés, Jorge M. Universidad Nacional del Comahue. Facultad de Ingeniería; Argentina
Direct determination of iron in acidified (pH 1.7) seawater samples by flow injection analysis with catalytic spectrophotometric detection: Application and intercomparison
No full textA sensitive flow injection method for determining iron in seawater developed by Measures et al. (1995) has been substantially modified to allow the direct preconcentration of dissolved iron in acidified seawater samples (pH 1.7) onto a nitrilotriacetic acid (NTA) chelating resin. This removes the need to adjust the pH and buffer samples before the preconcentration step, and the low pH eliminates potential interference from the presence of strong iron-binding organic ligands. As part of an international intercalibration exercise for the Sampling and Analysis of Fe (SAFe), we investigated at sea the precision and accuracy of this flow injection method with its preconcentration step plus catalytic spectrophotometric detection with N,N-dimethyl-p-phenylenediamine dihydrochloride (FI-NTA-DPD). Acidified seawater samples analyzed using FI-NTA-DPD were shown to be in excellent agreement with other ship- and lab-based methods. The acidification of seawater samples to pH 1.7 is an important protocol if total dissolved iron in seawater is to be determined within hours of collection. A ship- and lab-based analytical intercomparison of two flow injection methods (FI-NTA-DPD and FI-NTA-ICP-SFMS) for the determination of total dissolved iron in seawater was carried out on SAFe samples collected from surface waters and at 1000 m depth from the North Pacific Ocean. For the two methods, total dissolved iron concentrations in surface samples were 0.101 ± 0.009 and 0.098 ± 0.009 nM, respectively, and in samples from 1000 m, 0.93 ± 0.04 and 0.92 ± 0.08 nM. No statistical difference between the FI-NTA-DPD and FI-NTA-ICP-SFMS methods was observed (P = 0.05).</p
PARAMETER POPULASI IKAN LOHAN (Cichlasoma trimaculatum, Günther 1867) DI WADUK SEMPOR, JAWA TENGAH
No full textWaduk Sempor di Kabupaten Kebumen, Jawa Tengah dengan luas 270 ha merupakan waduk serbaguna yang berfungsi untuk pembangkit listrik tenaga air (PLTA), pariwisata, irigasi dan perikanan. Aktivitas perikanan yang berkembang di waduk ini adalah perikanan tangkap meskipun saat ini mengalami penurunan sebagai akibat dari berkurangnya hasil tangkapan ikan ekonomis yang digantikan oleh jenis ikan asing invasif yang bernilai ekonomis rendah. Jenis ikan asing invasif yang mendominasi adalah ikan lohan (Cichlasoma trimaculatum, Günther, 1867). Tujuan penelitian ini adalah untuk mengkaji beberapa parameter populasi yakni hubungan panjang berat, parameter pertumbuhan, mortalitas dan laju eksploitasi ikan lohan di Waduk Sempor. Pengambilan sampel ikan lohan dilakukan menggunakan alat tangkap jaring insang berbagai ukuran mata jaring selama periode Maret sampai Desember 2012. Sebanyak 1.962 ekor sampel ikan lohan yang tertangkap dianalisis untuk menghitung parameter populasinya. Estimasi parameter pertumbuhan, mortalitas dan laju eksploitasi dihitung menggunakan paket program FiSAT II. Hasil penelitian menunjukkan bahwa pola pertumbuhan ikan lohan bersifat isometrik dengan estimasi parameter pertumbuhan sebagai berikut: L∞ = 20,5 cmTL, K = 0,37 tahun-1, to = -0,4955 tahun dan tmax = 8,11 tahun. Laju mortalitas total (Z) sebesar 1,29 tahun-1, mortalitas alami (M) sebesar 1,05 tahun-1, mortalitas penangkapan (F) sebesar 0,24 tahun-1 dengan laju eksploitasi (E) sebesar 0,18 yang menunjukkan laju eksploitasi yang rendah.Sempor reservoir at Kebumen Regency, Central Java with a waters surface area of 270 ha is a multi-purpose reservoir for hydroelectric power generation, tourism, irrigation and fisheries. Currently, capture fisheries activity developed in the reservoir tend to decrease as a result of decreasing economical fish yield which was replaced by invasive alien species of low economic value. The dominant invasive alien species catches was three spot cichlid (Cichlasoma trimaculatum, Günther, 1867). The purpose of this study was to analyze some population parameters i.e., length-weight relationship, growth parameters, mortality and exploitation rate of the three spot cichlid. The fish samples were collected using experimental gillnet with difference mesh sizes during the period of March to December 2012. Population parameters of the three spot cichlid were analyzed from 1,962 individual samples. The population parameters were estimated by using package program of FiSAT II. Results of the study showed that growth pattern of the three spot cichlid was isometric with estimated of growth parameters L∞ = 20.5 cmTL, K = 0.37yr-1, to = -0.4955 years and tmax = 8.11 years. The total mortality rate (Z) was 1.29 yr-1, natural mortality (M)1.05yr-1, fishing mortality (F) 0.24 yr-1 and the exploitation rate (E) was 0.18 which was indicated very low exploitation
The distribution of reactive iron in northern Gulf of Alaska coastal waters
No full textCoastal waters in the northern Gulf of Alaska (GoA) are considered iron-rich and nitrate-poor, in contrast to the iron-poor, high-nitrate, low chlorophyll (HNLC) waters of the central GoA. The degree of mixing between these two regimes, enhanced by mesoscale eddies, is essential to the high productivity observed in the region. As part of a study on iron delivery to the central GoA via mesoscale eddies, extensive work was focused on characterizing the coastal endmember, the Alaska Coastal Current. In surface Alaskan coastal waters between Yakutat and the Kenai Peninsula, dissolved iron concentrations ranged from 0.5 to 4.1. nM with an average of ~. 2. nM. In contrast, leachable particulate iron concentrations were much higher and more variable, ranging from over 1 μM in the Alsek River plume to less than 5. nM at the base of Cook Inlet. Cross-shelf transport of both surface and subsurface dissolved iron and leachable particulate iron was observed. Throughout the study area, leachable particulate iron values were at least an order of magnitude higher than dissolved values, suggesting that the system's ability to solubilize this large concentration of leachable particulate iron is overwhelmed by the massive input of glacial-derived particulate iron. Nevertheless, suspended leachable particulate iron remains available for exchange to the dissolved phase and is suggested to maintain a relatively constant (~. 2. nM) source of dissolved iron in the coastal GoA.</p
A Fast Unambiguous Acquisition Algorithm for BOC-Modulated Signals
No full textThis paper proposes a fast unambiguous acquisition technique
for binary-offset-carrier (BOC)-modulated signals. We remove the
ambiguities (side peaks) of the BOC autocorrelation function (ACF), exploiting
a reduced-complexity (real and symmetric) filter composed of only
seven nonzero samples. The proposed scheme is applicable to both generic
sine- and cosine-phased BOC signals. Theoretical and simulation results
show that the proposed method removes the ambiguities in the acquisition
problem without requiring an auxiliary signal in the receiver
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Search Engine Optimisation in UK news production
No full textThis is an Author's Accepted Manuscript of an article published in Journalism Practice, 5(4), 462 - 477, 2011, copyright Taylor & Francis, available online at: http://www.tandfonline.com/10.1080/17512786.2010.551020.This paper represents an exploratory study into an emerging culture in UK online newsrooms—the practice of Search Engine Optimisation (SEO), which assesses its impact on news production. Comprising a short-term participant observational case study at a national online news publisher, and a series of semi-structured, in-depth interviews with SEO professionals at three further UK media organisations, the author sets out to establish how SEO is operationalised in the newsroom, and what consequences these practices have for online news production. SEO practice is found to be varied and application is not universal. Not all UK news organisations are making the most of SEO even though some publishers take a highly sophisticated approach. Efforts are constrained by time, resources and management support, as well as off-page technical issues. SEO policy is found, in some cases, to inform editorial policy, but there is resistance to the principal of SEO driving decision-making. Several themes are established which call for further research
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