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	Provedor de dados ArchiMer (1) Autor Abdel-aziz, Amal Kamal (1) Abdelfatah, Sara (1) Abdellatif, Mahmoud (1) Abdoli, Asghar (1) Abel, Steffen (1) Abeliovich, Hagai (1) Abildgaard, Marie H. (1) Abudu, Yakubu Princely (1) Acevedo-arozena, Abraham (1) Adamopoulos, Iannis E. (1) Adeli, Khosrow (1) Adolph, Timon E. (1) Adornetto, Annagrazia (1) Aflaki, Elma (1) Agam, Galila (1) Agarwal, Anupam (1) Aggarwal, Bharat B. (1) Agnello, Maria (1) Agostinis, Patrizia (1) Agrewala, Javed N. (1) Mais... Palavra-chave Autophagosome (1) Cance (1) LC3 (1) Lysosome (1) Macroautophagy (1) Neurodegeneration (1) Phagophore (1) Rflux (1) Stress (1) Vacuole (1) Mais... Tipo do documento Text (1) Ano 2021 (1) País France (1) Idioma Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 333 Primeira ... 1 2 3 4 5 6 7 8 9 ... Última AN EXAMINATION OF PROFIT INEFFICIENCY OF RICE FARMERS IN NORTHERN GHANA AgEcon Abdulai, Awudu; Huffman, Wallace E.. This paper employs a stochastic frontier model to examine profit inefficiency of rice farmers in the Northern Region of Ghana using farm-level survey data. The efficiency index, based on a half-normal distribution of the stochastic error term is related to farm and household characteristics. The empirical results show that farmers' human capital represented by the level of schooling contributes positively to production efficiency, suggesting that investment in farmers' education improves their allocative performance. Access to credit and greater specialization in rice production, are found to be positively related to production efficiency. A farmer's participation in nonfarm employment and being older, however, reduce production efficiency. Farmers... Tipo: Working or Discussion Paper Palavras-chave: Africa; Ghana; Production efficiency; Profit frontier; Rice; Crop Production/Industries. Ano: 1998 URL: http://purl.umn.edu/18271 Ambient noise Rayleigh wave tomography across the Madagascar island ArchiMer Adimah, N I; Padhy, S. The unusual complex lithospheric structure of Madagascar is a product of a number of important geological events, including: the Pan-African Orogeny, episodes of Late Cenozoic intraplate volcanism and several phases of deformation and metamorphism. Despite this rich history, its detailed crustal structure remains largely underexplored. Here, we take advantage of the recently obtained data set of the RHUM-RUM (Réunion Hotspot and Upper Mantle–Réunions Unterer Mantel) seismological experiment, in addition to previously available data sets to generate the first Rayleigh wave group velocity maps across the entire island at periods between 5 and 30 s using the ambient noise tomography technique. Prior to preliminary data preparation, data from Ocean Bottom... Tipo: Text Palavras-chave: Seismic tomography; Africa; Crustal structure; Surface waves and free oscillations; Seismic noise.. Ano: 2020 URL: https://archimer.ifremer.fr/doc/00600/71184/69539.pdf Dairy development in Ethiopia AgEcon Ahmed, Mohamed A. M.; Ehui, Simeon K.; Assefa, Yemesrach. Ethiopia holds large potential for dairy development due to its large livestock population, the favorable climate for improved, high-yielding animal breeds, and the relatively disease-free environment for livestock. Given the considerable potential for smallholder income and employment generation from high-value dairy products, development of the dairy sector in Ethiopia can contribute significantly to poverty alleviation and nutrition in the country. Like other sectors of the economy, the dairy sector in Ethiopia has passed through three phases or turning points, following the economic and political policy in the country. In the most recent phase, characterized by the transition towards market-oriented economy, the dairy sector appears to be moving... Tipo: Working or Discussion Paper Palavras-chave: Ethiopia; Dairy; Livestock; Dairy products industry; Livestock productivity; Africa; Sub-Saharan Africa; East Africa; Livestock Production/Industries. Ano: 2004 URL: http://purl.umn.edu/60321 AFRICA GROWTH AND OPPORTUNITY ACT (AGOA) AND AFRICAN AGRICULTURE AgEcon Akanji, O.O.. AGOA directs the President of the United States to convene an annual meeting between the U.S. government and representatives of eligible African countries and to prepare an annual report to Congress on U.S. trade and investment policies with sub-Saharan Africa (SSA). Currently, Angola, Gabon, Nigeria and South Africa- accounted for the bulk (84 percent) of U.S. total imports from SSA. Since the passage of AGOA, the business climate has improved for non-agricultural exports and growth in these sectors has made relatively low direct benefits to Africa’s poor. Consequently, expanding AGOA’s application to African agriculture would have a significant impact on reducing hunger and poverty and therefore, on improving overall conditions in SSA. As a result of... Tipo: Report Palavras-chave: Africa; AGOA; United States; Agriculture; International Development. Ano: 2007 URL: http://purl.umn.edu/54384 Information and Firms’ Search Behavior AgEcon Aker, Jenny; Tack, Jesse B.. Information and communications technologies (ICTs) have spread rapidly over the past decade. There has been considerable interest in the effect of such technology on search costs, search behavior and welfare outcomes, particularly in developing countries. This paper investigates the impact of a new search technology, mobile phones, on traders’ search and marketing behavior in Niger. We construct a novel theoretical model of sequential search, in which traders engage in optimal search for the maximum sales price, net transport costs. The model predicts that the introduction of a new search technology, such as mobile telephones, will increase traders’ reservation sales prices and the number of markets over which they search. To test the predictions of the... Tipo: Conference Paper or Presentation Palavras-chave: Africa; Information; Information Technology; Search Costs; Niger; Agricultural and Food Policy; Food Security and Poverty; International Development; Marketing; O1; O3; Q13. Ano: 2011 URL: http://purl.umn.edu/103404 Quantifying the Human Appropriation of Fresh Water by African Agriculture Ecology and Society Alcamo, Joseph; Center for Environmental Systems Research, University of Kassel; alcamo@usf.uni-kassel.de. Tipo: Peer-Reviewed Reports Palavras-chave: Africa; Agriculture; Blue water; Green water; Hydrological modeling; LandSHIFT; Land-use modeling; WaterGAP. Ano: 2009 Productivity growth and the effects of R&D in African agriculture AgEcon Alene, Arega D.. This paper measures and compares total factor productivity growth in African agriculture under contemporaneous and sequential technology frontiers over the period 1970–2004. The paper further investigates the sources of agricultural productivity growth using a fixed-effects regression model and a second-degree polynomial distributed lag structure for agricultural research. The conventional estimates show an average productivity growth rate of only 0.3% per year over the period 1970–2004. In contrast to conventional measures, however, the improved measures under sequential technology show that agricultural productivity grew at a higher rate of 1.8% per year. Technical progress, rather than efficiency change, was the principal source of productivity growth.... Tipo: Conference Paper or Presentation Palavras-chave: Productivity growth; Sequential technology; R&D; Africa; International Development; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies. Ano: 2009 URL: http://purl.umn.edu/51436 Value added of Cluster Membership for Micro Enterprises of the Handloom Sector in Ethiopia AgEcon Ali, Merima; Peerlings, Jack H.M.. By contrasting the performance of clustered micro enterprises with that of dispersed ones in the handloom sector in Ethiopia, this study shows that clustering significantly increases profit. To correct for selection bias, we match clustered and dispersed micro enterprises that share similar observable characteristics except for being clustered both in urban and rural areas. Results show that clustering is more profitable in urban than rural areas. It is also found that regional specific factors determining clustering of micro enterprises are different in urban and rural areas, highlighting the need to focus on local circumstances when formulating policies to promote clusters. Tipo: Conference Paper or Presentation Palavras-chave: Cluster; Micro enterprises; Propensity score matching; Handloom; Africa; Ethiopia.; Industrial Organization; L10; L67; R12. Ano: 2009 URL: http://purl.umn.edu/49922 Maize Market Sheds in Eastern and Southern Africa. Report 1. Country Annexes AgEcon Aliguma, Lucy; Ashimogo, Gasper; Mwale, Geoffrey S.; Nyoro, James K.; Phiri, Alexander; Traub, Lulama Ndibongo. Annexes to the report prepared by Michigan State University for the World Bank under contract No. 7144132, Strengthening Food Security in Sub-Saharan Africa through Trade Liberalization and Regional Integration Tipo: Report Palavras-chave: Africa; Markets; Maize; Crop Production/Industries; Q13. Ano: 2008 URL: http://purl.umn.edu/55375 Organic farming in Khartoum Organic Eprints Alkhalifa, Batoul; Elkhatim, Azza; Awouda, Elhag; Tawfig, Suad. Interest in organic agriculture and its products has widely grown in the world, mainly because of the increasing environmental and health hazards associated with the intensive use of chemicals in agriculture. Sudan, in spite of its high potential of organic agricultural production along the shores of the Nile, rivers, and the seasonal streams, has not been able to widely invest in organic production. Over the last years, the paradigm of organic agriculture as a sustainable mode of production has strongly grown among the Sudanese community. Furthermore, the importance of this type of production is progressively increasing amongst researchers, as well as policy makers as a good sign for a healthy thinking lead to take serious steps toward organic production... Tipo: Conference paper, poster, etc. Palavras-chave: Africa. Ano: 2014 URL: http://orgprints.org/23236/7/23236.pdf CONSUMER CHARACTERISTICS AND PREFERENCES FOR ORGANIC PRODUCTS IN KAMPALA, UGANDA Organic Eprints Anecho, Stephen. This study describes the findings from a consumer survey that was conducted to understand the consumer characteristics and preferences for organic products in Kampala, Uganda. The survey used a mall intercept survey method to investigate consumer revealed preferences for key organic and conventional products attributes. A face-to-face interview was used to collect data on consumer preferences towards organic food attributes that reveals preference for specific organic and conventional products. The survey was conducted in two purely organic retail outlets in Kampala as well as from consumer outlets that sell conventional alongside few organic products. A sample of 228 respondents was interviewed. An empirical analysis of the factors that influenced... Tipo: Thesis Palavras-chave: Consumer issues; Africa. Ano: 2015 URL: http://orgprints.org/30908/1/Anecho%20Stephen%20Msc%20Final%20Thesis.pdf Alert at Maradi: Preventing Food Crises in West Africa by Using Price Signals AgEcon Araujo, Claudio; Araujo-Bonjean, Catherine; Brunelin, Stephanie. The aim of this paper is to exploit grain price data to detect the warning signs of looming food crises in Mali, Burkina Faso and Niger. Firstly we identify which markets play a leading role at the national and regional level. The second step consists of identifying crisis periods and characterizing price movements during the period proceeding a crisis. This analysis leads to the identification of early warning indicators whose relevance is tested using panel data qualitative choice models. The results show that monitoring price movements on "leading markets" during crucial periods of the year can help in forecasting future crises. Tipo: Conference Paper or Presentation Palavras-chave: Food security; Africa; Niger; Early warning systems; Discrete choice panel model; Food Security and Poverty; Q18; C25; D40; O18. Ano: 2011 URL: http://purl.umn.edu/114226 Trends and Patterns in Fertilizer Use by Smallholder Farmers in Kenya, 1997-2007 AgEcon Ariga, Joshua; Jayne, Thomas S.; Kibaara, Betty; Nyoro, James K.. This study uses nationwide household panel survey data from 1996/97 to 2006/07 to examine trends in fertilizer use on maize by smallholder maize growers. The paper also compares these findings with fertilizer use rates according to other recent surveys in Kenya to assess comparability. We also examine the correlation between household fertilizer use and indicators of welfare such as wealth and landholding size. In addition, we use econometric techniques applied to household survey data to identify the main household and community characteristics associated with fertilizer purchases. Lastly, the study considers alternative policy strategies for maintaining smallholders’ access to fertilizer in the current context of substantially higher world fertilizer... Tipo: Working or Discussion Paper Palavras-chave: Fertilizer; Africa; Malawi; Kenya; Small Holders; Crop Production/Industries; Q13. Ano: 2008 URL: http://purl.umn.edu/55169 Biofuels, Poverty, and Growth: A Computable General Equilibrium Analysis of Mozambique AgEcon Arndt, Channing; Benfica, Rui M.S.; Tarp, Finn; Thurlow, James; Uaiene, Rafael N.. This paper assesses the implications of large-scale investments in biofuels for growth and income distribution. We find that biofuels investment enhances growth and poverty reduction despite some displacement of food crops by biofuels. Overall, the biofuel investment trajectory analyzed increases Mozambique’s annual economic growth by 0.6 percentage points and reduces the incidence of poverty by about six percentage points over a 12-year phase-in period. Benefits depend on production technology. An outgrower approach to producing biofuels is more pro-poor, due to the greater use of unskilled labor and accrual of land rents to smallholders, compared with the more capital-intensive plantation approach. Moreover, the benefits of outgrower schemes are enhanced... Tipo: Working or Discussion Paper Palavras-chave: Bio-fuels; Growth; Poverty; Mozambique; Africa; Agricultural and Food Policy; International Development; Resource /Energy Economics and Policy. Ano: 2008 URL: http://purl.umn.edu/52004 Comment on 'A new scheme for the opening of the South Atlantic Ocean and the dissection of an Aptian salt basin' by Trond H. Torsvik, Sonia Rousse, Cinthia Labails and Mark A. Smethurst ArchiMer Aslanian, Daniel; Moulin, Maryline. P>Torsvik et al. recently presented a revised model for the opening of the South Atlantic Ocean. According to these authors, this new plate tectonic model is internally consistent and consistent with globally balanced plate motion solutions and takes into account realistic intraplate deformation. However, this model shows a number of kinematic and geological problems that we underline here, together with some comparisons with the new kinematic model recently proposed by Moulin et al. Tipo: Text Palavras-chave: Plate motions; Continental margins: divergent; Africa; Atlantic Ocean; South America. Ano: 2010 URL: http://archimer.ifremer.fr/doc/00014/12504/9878.pdf Atelier sur la transformation de l'agriculture en Afrique: Abidjan, Côte D'Ivoire, September 26-29, 1995 AgEcon Ba, Moussa Batchily; Staatz, John M.; Farrelly, Laura L.; Camara, Youssouf; Dimithe, Georges. À l'initiative de l'USAID, la BAD, MSU et l’INSAH, une quarantaine de chercheurs, de décideurs politiques et d’opérateurs-terrain venus de 19 pays et représentants une vingtaine d'institutions Africaines ou internationales se sont retrouvés à Abidjan dans le cadre d'un atelier continental pour débattre sur le thème de la transformation de l'agriculture Africaine. Cet atelier a été parrainé par le Ministre de l'Enseignement Supérieur et de la Recherche Scientifique de la Côte d'Ivoire. L'atelier d'Abidjan s'est basé sur les réflexions précédentes portant sur les défis à relever (insécurité alimentaire, pauvreté, et dégradation de l’environnement) au cours du processus de stimulation de la transformation structurelle de l'agriculture en Afrique, notamment... Tipo: Report Palavras-chave: Food security; Food policy; Agricultural transformation; Africa; International Development; Downloads July 2008 - July 2009: 21; F11. Ano: 1999 URL: http://purl.umn.edu/54669 Workshop on Agricultural Transformation in Africa: Abidjan, Côte D'Ivoire, September 26-29, 1995 AgEcon Ba, Moussa Batchily; Staatz, John M.; Farrelly, Laura L.; Camara, Youssouf; Dimithe, Georges. At the initiative of USAID, the ADB, MSU, and INSAH, 40 researchers, policy makers and private-sector entrepreneurs from 19 countries, representing 20 African and international organizations, met in Abidjan for a continent-wide workshop to debate issues related to transformation of African agriculture. The Abidjan workshop built on previous discussions organized by Winrock International, the World Bank, USAID (AFR/SD/PSGE/FSP) and IFPRI concerning the key challenges (food insecurity, poverty, and environmental degradation) that need to be addressed while fostering a structural transformation of African agriculture. Tipo: Report Palavras-chave: Food security; Food policy; Agricultural transformation; Africa; International Development; Downloads July 2008-July 2009: 20; R11. Ano: 1999 URL: http://purl.umn.edu/54668 Trade Pessimism and Regionalism in African Countries: the Case of Groundnut Exporters AgEcon Badiane, Ousmane; Kinteh, Sambouh. Tipo: Report Palavras-chave: Peanut industry; Africa; Oil industries; International Relations/Trade. Ano: 1994 URL: http://purl.umn.edu/44444 The Sophistication and Diversification of the African Agricultural Sector: A Product Space Approach AgEcon Badibanga, Thaddee Mutumba; Ulimwengu, John M.. We use the concept of the product space to analyze the key features of the transformation process in Africa with a focus on the agricultural sector. Between 1962 and 2008, we find that both specialization and diversification occur for the overall economy and across sectors. Our findings also confirm that the transformation of the African economy is driven primarily by the increasing specialization of nonagricultural exports. However, the transformation process is still moving more slowly than that of an emerging economy such as Brazil. The index of specialization of agricultural exports grew at a modest annual rate of 2.1 percent between 1962 and 2008, compared to 5.0 percent for nonagricultural exports and 4.1 percent for the overall economy. Although... Tipo: Working Paper Palavras-chave: Structural transformation; Diversification; Sophistication; Growth; Export; Africa; Agricultural and Food Policy; Crop Production/Industries; International Development; International Relations/Trade; Production Economics; Research and Development/Tech Change/Emerging Technologies; F19; O14; O33; O40. Ano: 2012 URL: http://purl.umn.edu/124498 Geophysical evidence for a transform margin offshore Western Algeria: a witness of a subduction-transform edge propagator? ArchiMer Badji, Rabia; Charvis, Philippe; Bracene, Rabah; Galve, Audrey; Badsi, Madjid; Ribodetti, Alessandra; Benaissa, Zahia; Klingelhoefer, Frauke; Medaouri, Mourad; Beslier, Marie-odile. For the first time, a deep seismic data set acquired in the frame of the Algerian-French SPIRAL program provides new insights regarding the origin of the westernmost Algerian margin and basin. We performed a tomographic inversion of traveltimes along a 100-km-long wide-angle seismic profile shot over 40 ocean bottom seismometers offshore Mostaganem (Northwestern Algeria). The resulting velocity model and multichannel seismic reflection profiles show a thin (3-4 km thick) oceanic crust. The narrow ocean-continent transition (less than 10 km wide) is bounded by vertical faults and surmounted by a narrow almost continuous basin filled with Miocene to Quaternary sediments. This fault system, as well as the faults organized in a negative-flower structure on the... Tipo: Text Palavras-chave: Seismic tomography; Continental margins: transform; Crustal structure; Africa; Europe.. Ano: 2015 URL: http://archimer.ifremer.fr/doc/00255/36670/35278.pdf Registros recuperados: 333 Primeira ... 1 2 3 4 5 6 7 8 9 ... Última

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