bluuebunny/crossref_metadata_2025_split huggingface dataset:
Time-delay Measurement of Mg ii Broad-line Response for the Highly Accreting Quasar HE 0413-4031: Implications for the Mg ii–based Radius–Luminosity Relation
Authors: Zajaček Michal , Czerny Bożena , Martinez–Aldama Mary Loli , Rałowski Mateusz , Olejak Aleksandra , Panda Swayamtrupta , Hryniewicz Krzysztof , Śniegowska Marzena , Naddaf Mohammad-Hassan , Pych Wojtek , Pietrzyński Grzegorz , Figaredo C. Sobrino , Haas Martin , Średzińska Justyna , Krupa Magdalena , Kurcz Agnieszka , Udalski Andrzej , Gorski Marek , Sarna Marek 
Published: June 2020

Abstract
We present the monitoring of the active galactic nuclei continuum and Mg ii broad-line emission for the quasar HE 0413-4031 (z = 1.38) based on the six-year monitoring by the South African Large Telescope (SALT). We manage to estimate a time-delay of

days in the rest frame of the source using seven different methods: interpolated cross-correlation function, discrete correlation function (DCF), z-transformed DCF, JAVELIN, two estimators of data regularity (Von Neumann, Bartels), and χ
2 method. This time-delay is below the value expected from the standard radius–luminosity relation. However, based on the monochromatic luminosity of the source and the spectral energy distribution modeling, we interpret this departure as the shortening of the time-delay due to the higher accretion rate of the source, with the inferred Eddington ratio of ∼0.4. The Mg ii line luminosity of HE 0413-4031 responds to the continuum variability as

, which is consistent with the light-travel distance of the location of Mg ii emission at R
out ∼ 1018 cm. Using the data of 10 other quasars, we confirm the radius–luminosity relation for the broad Mg ii line, which was previously determined for the broad Hβ line for lower-redshift sources. In addition, we detect a general departure of higher-accreting quasars from this relation in analogy to the Hβ sample. After the accretion-rate correction of the light-travel distance, the Mg ii–based radius–luminosity relation has a small scatter of only 0.10 dex.
Cosmological Parameter Estimation from the Two-dimensional Genus Topology: Measuring the Shape of the Matter Power Spectrum
Authors: Appleby Stephen , Park Changbom , Hong 홍 Sungwook E. 성욱 , Hwang Ho Seong , Kim Juhan 
Published: June 2020

Abstract
We present measurements of the two-dimensional genus of the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS) catalogs to constrain cosmological parameters governing the shape of the matter power spectrum. The BOSS data are divided into 12 concentric shells over the redshift range 0.2 < z < 0.6, and we extract the genus from the projected two-dimensional galaxy density fields. We compare the genus amplitudes to their Gaussian expectation values, exploiting the fact that this quantity is relatively insensitive to nonlinear gravitational collapse. The genus amplitude provides a measure of the shape of the linear matter power spectrum and is principally sensitive to Ωc
h
2 and scalar spectral index n
s. A strong negative degeneracy between Ωc
h
2 and n
s is observed, as both can increase small-scale power by shifting the peak and tilting the power spectrum, respectively. We place a constraint on the particular combination

—we find

after combining the LOWZ and CMASS data sets, assuming a flat ΛCDM cosmology. This result is practically insensitive to reasonable variations of the power spectrum amplitude and linear galaxy bias. Our results are consistent with the Planck best fit

.
Le surveillant général, « ancêtre encombrant » du conseiller principal d’éducation (CPE), le mythe à l’aune des données archivistiques
Authors: Focquenoy-Simonnet Christine 
Published: June 2020

L’Archive révèle le profil historique du surveillant général, plus nuancé que l’image caricaturale laissée par cet acteur scolaire des xix e et xx e siècles dans les représentations. L’analyse historique, basée sur un croisement des sources (dossiers de carrière, textes officiels, témoignages, revue professionnelle…) a permis de cerner les missions, les attentes institutionnelles et les caractéristiques socio-professionnelles du surveillant général. Celui-ci doit être « un bon disciplinaire » exécutant les ordres. Il est le garant de l’éducation comme clôture. Sa carrière s’apparente à un parcours d’obstacles pour gravir une subtile échelle de prestige jusqu’au graal parisien Les années 1950-1960, théâtre d’une profonde évolution de la société et du système éducatif, constituent le terreau propice à l’éclosion du Conseiller principal d’éducation. Le changement d’appellation marque une rupture qui masque une réalité professionnelle plus complexe, pour ce nouvel acteur scolaire. Les scories de l’héritage historique ne lui permettent pas toujours d’être concepteur de son activité.
Quel investisseur êtes-vous ? Proposition de profils
Authors: Pozniak Laetitia , Scoubeau Chantal 
Published: June 2020

Peut-on parler de l’investisseur avec un grand « I » ? Cette enquête auprès de 706 ménages belges a mené à l’identification de 5 profils d’investisseurs : les dormants, qui délèguent complètement la gestion de leurs avoirs ; les traditionnels, influencés par leur famille ; les suiveurs, sensibles aux médias et à leurs pairs ; les joueurs, caractérisés par l’effet de disposition et le goût du risque et les experts, maîtres dans l’art de la diversification et soucieux d’investir aussi localement.
Cartographie de la postmodernité chinoise
Authors: Ning Wang , Bartel David 
Published: June 2020

Pour Wang Ning, l’existence en Chine d’une forme de postmodernisme ne fait pas de doute malgré le défaut de certaines conditions de la postmodernité. Dans ce texte, Wang regarde comment l’extension global du postmoderne, étudiée depuis ses pratiques critiques et créatives, a généré un phénomène hétéroclite. Il cartographie ici pour nous les similarités et les différences entre le « postmodernisme » chinois et sa contrepartie occidentale.
Raviver la « Guerre de libération nationale » et la dépasser : l’Algérie attend le 1 er novembre
Authors: Badis Salah 
Published: June 2020

« Dépasser Novembre n’est pas une rupture telle que l’interpréteraient l’État et son histoire officielle. Dépasser Novembre implique d’assimiler ce legs révolutionnaire et de le reconnaître afin de tourner la page pour en écrire une nouvelle », écrit le journaliste et poète Salah Badis le 30 octobre 2019, dans un texte publié initialement en arabe dans le journal électronique Al Manassa . Le titre est sans concession : « Raviver la “Guerre de libération nationale” et la dépasser : l’Algérie attend le 1 er novembre ». La 37 e marche coïncide en effet avec la date hautement symbolique du 65 e anniversaire du déclenchement de la lutte armée pour l’indépendance. En se réappropriant l’histoire nationale et en ouvrant le champ des possibles, le Hirak non seulement en rappelle les fondements mais surtout les actualise, faisant de la révolution un processus d’avenir.
Consigner le Hirak : de l’expérience à l’archive
Authors: Chenoufi Lalia , Direche-Slimani Karima 
Published: June 2020

Prenant à bras le corps le déferlement d’images et de sons qui ont dès le premier jour accompagné, traduit, doublé le Hirak, les auteures entreprennent une méditation sur leur « goût de l’archive », ces archives-ci et leur nature singulière autant que révolutionnaire, en ce qu’elles sont aussi inattendues que le soulèvement lui-même. L’histoire de l’Algérie, tant ancienne que récente, a été trouée et confisquée par un pouvoir constant dans sa stratégie d’occultation. Il est alors décisif d’arrimer ces flux d’images concomitants aux événements aux différents régimes d’apparition, de visibilisation, de mise en récit, de conservation et d’analyse dont ils sont désormais justiciables, ce afin d’éclairer la question plus vaste du désir d’y trouver sa place.
« Ça passe ou ça ne passe pas ? »
Authors: Slim  , Nime  , Souiah Farida 
Published: June 2020

Dans cet entretien, les paroles de deux dessinateurs, Slim et Nime – et par leurs biais de deux générations différentes – se croisent et se font écho. Ils reviennent sur leur rapport au dessin, les difficultés à en faire un métier ainsi que sur leurs expériences dans le contexte politique algérien actuel et passé où les lignes rouges sont floues et mouvantes ; il est difficile de prédire quand la censure va frapper. Slim est le créateur de certains des personnages emblématiques de la BD algérienne : Bouzid, Zina, le Gatt M’digouti (le chat dégoûté). Il a contribué à des aventures éditoriales qui ont marqué l’histoire du pays : la première revue dessinée algérienne M’Quidèch ou encore la revue dessinée satirique El Manchar . Il collabore aujourd’hui avec Le Soir d’Algérie , dans lequel il publie une planche hebdomadaire. Nime est quant à lui l’auteur de plusieurs dessins emblématiques du Hirak, notamment L’élu et Le regret de la juge pour lesquels il fut emprisonné. Il partage ses créations sur son blog, Dans ma bulle , et sur sa page Facebook.
Quand l’armée algérienne occupe le devant de la scène politique
Authors: Arezki Saphia 
Published: June 2020

En Algérie, l’armée occupe les devants de la scène politique lors des temps de crise ou de transition politique : de l’été 1962 à la démission forcée d’Abdelaziz Bouteflika en avril 2019, en passant par la désignation de Chadli Bendjedid (1978-1979) et l’interruption du processus électoral en janvier 1992. En retracer l’histoire permet de mieux appréhender ces moments, où la façade civile du régime politique algérien vient à tomber.
Effect of slope aspect and position on soil infiltrability in an ultisol in Akwa Ibom State, southern Nigeria
Authors: Ogban P.I. , Okon A.X. 
Published: June 2020

Soil infiltrability is an important hydrological process that enhances soil water storage and the minimization of runoff. A study was conducted to evaluate the effect of slope aspect (north, NfS and south, SfS) and positions [(crest (CR), upper (US), middle (MS) and lower (LS)] on soil infiltrability, that is, initial infiltration rate (io), steady-state infiltration rate (ic) and cumulative infiltration (I), and sorptivity (S) and transmissivity (A) on the University of Uyo Teaching and Research Farm (T&SF) located on an Ultisol in Akwa Ibom State, southern Nigeria. Results show that the initial infiltration rate (io) was 43.20 cm h−1 on SfS and significantly (p < 0.05) higher than 36.60 cm h−1 on NfS. The final infiltration rate (ic) was not significantly different between NfS (9.60 cm h−1) and SfS (7.20 cm h−1). The Cumulative depth of water (I) infiltrated was similar between NfS (28.18 cm) and SfS (21.46 cm). Soil water sorptivity (S) was moderately high on the two slopes but significantly (p < 0.05) lower in NfS (0.49 cm min−1/2) than in SfS (0.70 cm min−1/2) soil. Soil water transmissivity (A) was similar in NfS (0.19 cm h−1) and SfS (0.16 cm h−1) soil. The results indicate that the aspects were similar in io, ic, I, S and A. However, since soil texture is similar among the aspects, similar soil management practices, example tillage and mulching, could be adopted to enhance water infiltration to improve ic for increases in soil water conservation and crop production on the T&SF.
Key words: slope aspect and position, soil infiltrability, sorptivity and transmissivity, soil water management
Challenges Associated with Postgraduate Students’ Awareness and Use of Online Journals in Nigerian Universities
Authors: Mole Austin J.C . , Edewor Nelson 
Published: June 2020

This study investigates the challenges associated with postgraduate students’ awareness and use of online journals in Nigerian universities. The study adopted the descriptive survey design. The population of the study comprised 10, 775 registered postgraduate students in federal and state universities in south-south zone of Nigeria. Based on the Krejcie and Morgan sample size determination table, a sample size of 370 postgraduate students were chosen for the study. The questionnaire was the instrument used for data collection. Copies of the questionnaire were distributed by hand by the researchers with the help of research assistants. Mean and standard deviation were used to analyse the data from the questionnaire. The major findings challenges associated with postgraduate students’ awareness and use of online journals were identified to include absence of enlightenment on online journals by lecturers (𝑋̅2.94,SD=.87), lack of knowledge of publishers of online journals (𝑋̅2.67,SD=.98), lack of user education on online journals from university libraries (𝑋̅2.80,SD=.93), inadequate computer systems in university libraries (𝑋̅3.58,SD=.73), frequent power outages in libraries (𝑋̅3.48,SD=.66), and slow internet connectivity in university libraries (𝑋̅2.96,SD=.94) among others. Respondents in the study proffered several strategies for enhancing awareness and use of online journals. Based on the findings, it was recommended that the cost of data bundle should be reduced by Internet service providers, particularly for postgraduate students to enhance the use of online journals. University libraries should engage in aggressive awareness campaign on online journals and their usefulness for effective research in universities. Additionally, university libraries should create a database of open access online journals to enable users search full text articles online from various publishers.
Keywords: Online Journals, Awareness, Use, Universities, Challenges
Extension agents perception of open data usage in agricultural communication in Abia State
Authors: Ifeanyi-obi C.C , Ibiso H.D 
Published: June 2020

The study assessed agricultural extension agent’s perception of open data usage in agricultural communication in Abia State. Simple random sampling technique was used to select 83 extension agents for the study. Data for the study was collected with the use of questionnaire and described with frequency counts, percentages and mean. A moderate percentage (68%) of extension agents were aware of open data with only 15% and 7% having high and very high level of awareness. A relatively high percentage (54%) understand what open data is all about with only 49% consenting to be involved in the use of open data mainly at a moderate level (66%). Extension agents mainly perceive open data to facilitate agricultural research ( x̄ = 3.2), facilitate access to research findings (x̄ = 3.2), give access to the work of other extension agents in other states ( x̄ = 3.2), expose them to innovation in agriculture ( x̄ = 3.2) and ensure timely access to all necessary information (x̄ = 3.1). The major challenges to the use of open data among extension agents were lack of fund to purchase internet bundle ( x̄ = 2.2), unavailability of internet facilities( x̄ = 2.1), lack of basic ICT facilities ( x̄ = 2.1) as well as lack of adequate knowledge of the use of ICT( x̄ = 2.0) and open data ( x̄ = 2.0). Propagation of the use of open data could be done mainly by provision of ICTs in offices ( = 3.6), training of extension agents to understand the concept of open data ( x̄ = 3.6) and provision of internet facilities for extension agents ( x̄ = 3.5). The study emphasized the need for Government through the Agricultural Development Programme (ADP) to provide basic ICT tools in offices and provision of internet facilities to enable extension agents maximize the use of open data.
Keywords: Open data, challenges, agriculture, extension agents
Food security situations among female headed households in Enugu East Senatorial Zone of Enugu State, Nigeria
Authors: Ozioko Remigius. I. , Nwigwe Blessing. C. , Asadu Anthonia. N. , Nwafor Miracle. I. , Nnadi Onyinyechi. I. , Onyia Chukwuemeka. C. , Enwelu Innocent. A , Oluwasegun Felix. O 
Published: June 2020

The study examined food security situation of female-headed households in Enugu State, Nigeria. The study identified livelihood activities of respondents, ascertained the food security situation, examined constraints to food security, and examined coping strategies of respondents. Multi-stage sampling procedure, snow ball and simple random techniques were used to select 72 female-headed households. Data were analyzed using mean score and factor analysis. Results showed that respondents livelihood activities included crop production (77.8%), processing and sale of palm produce (43.1%) and processing of farm produce (38.9%). Household food security situations included food secure to moderately food-insecure. Major constraints to food security of the respondents were poverty ( x̄ =2.52), lack of education and skill ( x̄ =2.50), poor rural infrastructure ( x̄ =2.50) and poor nutrition education ( x̄ =2.54). Coping strategies included restriction of food consumption of adults ( x̄ =2.21) reducing food consumption per day ( x̄ =2.00) and staying hungry ( x̄ =2.04). The study concludes that the households in the area were grossly food insecure as they spent more of their meager earning only on food. There was poor nutrition education and lack of productive skills. Poverty was found to be a major cause of food insecurity in the area as it robs people the option of fine choices. Hence, government and other development agencies should provide policies and efforts that assist Female headed households in capacity building like providing them with productive resources which will expand their scope of livelihood choices.
Keywords: Food security, female headed household, food situation, poverty
Smallholder farmers willingness to pay for privatized agricultural extension services in Tigray National Regional State, Ethiopia
Authors: Gebreegziabher Kidane Tesfay , Mezgebo Gidey Kidu 
Published: June 2020

This study assessed farmers’ willingness to pay for privatization of agricultural extension services and examined factors that determine willingness to pay for those services. Multistage sampling procedure was used in selecting 240 households. Data were collected using household survey, focus group discussion and key informant interview tools. Data were analyzed using percentage and logit model. Results showed that 58% of the respondents were willing to pay for the privatization of agricultural extension services. Farm size, age, family size, credit access, frequency of extension contact and income were significantly influenced farmers’ willingness to pay for privatization of agricultural extension services. Privatization of agricultural extension services encourages graduates of agricultural sciences to launch consultancy firms and this engenders professional entrepreneurship. Number of visits, socioeconomic, and institutional factors must be given emphasis for privatizing the agricultural extension service in Ethiopia. Moreover, government should launch privatization parallel to the public agricultural extension services
Keywords: Agricultural extension service, willingness, privatization. Ethiopia
Training needs of melon (<i>citrillus colocynthis</i> (l.) schrad) farmers in Okigwe Agricultural Zones of Imo state, Nigeria
Authors: Emodi Angela I. , Nwokolo Chinyelu I. , Obiorah Joy A. 
Published: June 2020

This study ascertained training needs of melon farmers in Imo State, Nigeria. Multi-stage sampling procedure was used to select 100 melon farmers from 10 town communities in the selected rural households. Data were collected through structured questionnaire and analysed using percentage and mean scores. Results from the study showed that the farmers training need in melon production among others were: sourcing of credit facilities ( x̄ =3.65), appropriate market information ( x̄ =3.58) and sourcing and training on fertilizer application ( x̄ =3.50). The main channel of communication among farmers was sales agents (hawkers) and marketers of melon products ( x̄ = 3.06). The major constraints to melon production were inadequate fund ( x̄ = 3.24), poor sales/ pricing system ( x̄ =3.15), low shelf life of processed melon products ( x̄ =3.11). Extension outfits should disseminate information and educate farmers on credit facilities, appropriate market and training on new techniques of how to cultivate melon in and out of season.
Keywords: Households, agricultural extension, melon production
Marketing channel, cost, and margins of crayfish wholesalers and retailers in Rivers State, Nigeria
Authors: Onyeagocha S.U.O. , Lemchi I.J. , Komi P.L. , Gbolagun A.O. 
Published: June 2020

Marketing channel, cost, and margins of crayfish in Rivers State, Nigeria was studied using a total eighty traders (thirty retailers and fifty wholesalers) selected from six major crayfish markets using a multi-stage sampling technique, six local government areas were selected purposively based on the existing crayfish trading activities, from each LGAs a major crayfish market was selected. Primary and secondary sources of data were collected for the study. The selling prices at wholesale and retail levels of the marketing channel and cost incurred in marketing were used to address the objectives. The results of the study showed that the direction of flow of crayfish, three marketing channels were identified, although, wholesalers get profit, they also incur more cost in marketing than retailers, the highest and lowest average selling price were recorded as N1834.43/kg and N1279.90/kg for crayfish traders, the consumers’ price percentage that was received by the crayfish farmers (harvesters) is 28.90% and 16.69% of the net marketing margin on retail and wholesale respectively of the selling price, while both levels were inefficient in their marketing efficiency. The major challenges faced by crayfish traders in Rivers State were poor access to credit facilities, inadequate storage facilities and high market levy. Provision of government and private access to credit for traders, improved storage facilities and formulation and enactment of independent act for crayfish marketing were highly recommended.
Keywords: Marketing channel, crayfish, cost and margins