1,357,089 research outputs found
Peculiarities of Space Dependent Conservation Laws: Inverse Design and Asymptotics
No full textRecently, results regarding the Inverse Design problem for Conservation Laws and Hamilton-Jacobi equations with x-dependent convex fluxes were obtained in Colombo, Perrollaz, and Sylla (2022), Colombo, Perrollaz, and Sylla (2023). More precisely, characterizations of attainable sets and the set of initial data evolving at a prescribed time into a prescribed profile were obtained. Here, we present an explicit example that underlines deep differences between the x-dependent and x-independent cases. Moreover, we add a detailed analysis of the time asymptotic solution of this example, again underlining differences with the x-independent case
Arsenura sylla subsp. sylla sylla (Cramer 1779
No full textArsenura sylla sylla (Cramer, 1779). Phalaena Attacus sylla Cramer, 1779: 79, pl. 240, fig. A. Arsenura sylla sylla – Draudt 1930: 792. DÉTERMINATION. — Morphologique. Moléculaire (BOLD:AAC0235). LOCALITÉ TYPE. — Suriname (Cramer 1779). RÉPARTITION GÉOGRAPHIQUE. — Guyano-amazonienne (Lemaire 1980). DISTRIBUTION EN GUYANE. — Connu des trois zones biogéographiques. HABITAT EN GUYANE. — Forêt primaire et savane. MATÉRIEL DU MITARAKA EXAMINÉ. — Guyane • Spécimen barcodé EL2112 (BOLD: AAC0235); Maripasoula, Mitaraka, Crique Alama (DZ); alt. 310 m; 2°14’1.9”N, 54°27’38.1”W; La Planète revisitée, MNHN / PNI Guyane; APA-973-1; 23.II-26.III.2015; E. Poirier leg.; MNHN.Published as part of Bénéluz, Frédéric, 2021, Liste commentée des Saturniidae (Lepidoptera, Bombycoidea) de Guyane, avec la liste des taxons récoltés au Mitaraka (extrême sud-ouest guyanais), pp. 759-809 in Zoosystema 43 (31) on page 763, DOI: 10.5252/zoosystema2021v43a31, http://zenodo.org/record/579681
Interview with Janelle Charles (Class of 2006) and Dudney Sylla (Class of 2008) by Aisha Rickford
No full textJanelle Charles ‘06 and Dudney Sylla ‘08 talk about their differing paths to Bowdoin. Sylla grew up in Boston, attending a Jesuit high school, and being a recipient of the Posse Scholarship. Charles talks about growing up in San Francisco, California and finding out about Bowdoin through fly-in programs. Both talk about the difficulty of transitioning to Bowdoin’s academic rigor, particularly as first-generation college students, and the freedom and independence that came with having an open college schedule. They also detail what it was like to leave their home communities and craft new communities at Bowdoin. Charles and Sylla both talk about the resources at Bowdoin and the leaders and professors that encouraged them and helped them feel seen at Bowdoin, particularly Shelley Roseboro, and reflect on their favorite memories and their own enduring friendship
The rise of securities markets : what can government do?
No full textUsing U.S. securities markets as a case history, the author explores the role securities markets play in economic development, how they emerge, and how regulation can make them more effective. Why the United States? Two centuries ago, it was a small undeveloped country with serious financial problems. It confronted those problems and, guided by Alexander Hamilton, creatively reformed its financial system, which then became a foundation of the U.S. economic infrastructure and a bulwark for long-term growth. When Hamilton's program established public credit and securitiesmarkets in the 1790s, U.S. citizens were immediately able to borrow from older, richer countries. U.S. wealth then increased until, by the end of the nineteenth century, U.S. residents began to lend and invest more abroad than they borrowed. During the 1820s and 1830s, the United States (usually state governments) borrowed large sums from foreign investors to build roads, canals, and early railroads, to make other transportation improvements, and to capitalize state banks. From the 1830s to the end of the century, still larger sums from overseas went into private U.S. railway companies that provided cheap transcontinental transportation. Most of this borrowing took the form of state and corporate bond sales to overseas investors. The pristine U.S. government credit established by Hamilton thus rubbed off on U.S. state and corporate debt. The British stock market did better than the U.S. market until the United States adopted security-market regulation (including disclosuire rules) under the SEC. Then the U.S. market became a world leader. The U.S. stock market developed more slowly than the bond market, but it both aided and benefited from foreign investment in U.S. bonds. Foreign investors preferred debt securities to equities, yet equities create a safety margin for bondholders who, because of this margin, are more willing to purchase and hold bonds. Foreign investors preferred bonds; U.S. investors, after exporting bonds, held more stocks than bonds at home. Why? Because good stock markets permit the conversion of equity securities into cash.Environmental Economics&Policies,Payment Systems&Infrastructure,Financial Intermediation,International Terrorism&Counterterrorism,Economic Theory&Research,Housing Finance,Insurance&Risk Mitigation,Financial Intermediation,Environmental Economics&Policies,Economic Theory&Research
Moor Baa la Taariixoo: Biography of the Great Scholar
No full textThe entire manuscript is available for download as a PDF file(s). Higher-resolution images may be available upon request. For technical assistance, please contact [email protected]. Fieldwork Team: Dr. Fallou Ngom (Pricipal Investigator; Director, African Studies Center), Ablaye Diakité (Local Project Manager), Mr. Ibrahima Yaffa (General Field Facilitator), and Ibrahima Ngom (photographer). Technical Team: Professor Fallou Ngom (Principle Investigator, Project Director and former Director of the African Studies Center at Boston University), and Eleni Castro (Technical Lead, BU Libraries). This collection of Mandinka Ajami materials is copied as part of the African Studies Center’s African Ajami Library. This is a joint project between BU and the West African Research Center (WARC), funded by the British Library/Arcadia Endangered Archives Programme. Access Condition and Copyright: These materials are subject to copyright and are distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License, which permits non-commercial use, distribution, and reproduction in any medium, provided the original author and source are fully cited using the information below. For use, distribution or reproduction beyond these terms, contact Professor Fallou Ngom ([email protected]). Citation: Materials in this web edition should be cited as: Ngom, Fallou, Castro, Eleni, & Diakité, Ablaye. (2018). African Ajami Library: EAP 1042. Digital Preservation of Mandinka Ajami Materials of Casamance, Senegal. Boston: Boston University Libraries: http://hdl.handle.net/2144/27112. For Inquiries: please contact Professor Fallou Ngom ([email protected]). For technical assistance, please contact [email protected] / Custodial history: The owner translated the manuscript from the Arabic original.The manuscript is a biography of the Mandinka scholar called Fode Koule Sylla (1752-1843), also known as Sylla Baa (Mandinka: The Great Sylla). This manuscript is based on the Arabic original that Fode Koule Sylla wrote. It was translated in Mandinka Ajami by the owner, Arfang Karamo Sylla, who is a great grandson of Sylla Baa, so that Mandinka Ajami literates can learn about his history. As customary in Muslim writings, the manuscript begins with an Islamic doxology in Arabic and continues in Mandinka Ajami. It traces the origin of Fode Koule Sylla to Boundou in Eastern Senegal and explains his itinerary, his host families, and the circumstances that brought him to Pakao-Darsilami in Casamance
Soil salinity and acidity : spatial variabil[it]y and effects on rice production in West Africa's mangrove zone
No full textIn the mangrove environment of West Africa, high spatial and temporal variability of soil constraints (salinity and acidity) to rice production is a problem for the transfer and adoption of new agronomic techniques, for land use planning, and for soil and water management. Recently, several National and International Agricultural Centers have initiated research programs to characterize environments where their newly developed technologies have to be applied. However, the mangrove agro- ecosystems in West Africa have not been characterized in a detailed way. Most of the soils in this environment are potential or actual saline acid sulfate soils. The spatial and temporal variability of soil salinity and acidity in these coastal lowlands results from complex interactions between climate, coastal morphology, river hydrology, vegetation, landform and tidal flooding. Diagnosing the occurrence of both potential and actual acid sulfate soils is the first step in land use planning for such areas. But to cope with the intricacies of these soils, understanding the processes of soil salinization and acidification at different scales should be formalized to properly characterize mangrove environments.The main objectives of this thesis were: 1) to give a comprehensive characterization framework for the West African mangrove environments with emphasis on the possibilities of and constraints for rice cultivation; 2) to determine the various causal factors for soil salinization and acidification; 3) to test whether temporal variability of soil chemistry is sufficient to provide a time window of minimum stress during the rice growing period; 4) to relate the response of rice to improved agronomic practices in specific environments and to provide a means to characterize specific rice growing locations, and 5) to test rice varietal responses to saline and acid sods under different agronomic practices and to relate yields and yield components to the nutrient contents in leaves, in order to diagnose physiological disorders.First, a multi-scale approach was developed involving a range from Macro to Micro level based on the pre-conditions of acid sulfate soil formation. The main factors for classification are climate and coastal morphology at Macro scale; hydrology, physiography and vegetation complexes at Meso level; and topography (catena), vegetation species, tidal flooding and sedimentation rate at Micro level. Information from previous process-based studies on acid sulfate soil formation and data from secondary sources were used. Different environments were then distinguished and their characteristics were summarized by ecological zone. Constraints to rice production and potentials for agricultural development were matched with environmental conservation issues.To determine the significance of the causal factors developed in the multiple scale approach, 12 sites were selected along 4 river basins in West Africa, vz. from north to south the Gambia, the Casamance (Senegal), the Geba (Guinea Bissau) and the Great Scarcies (Sierra Leone). Along each river basin 3 sites were selected based on distance from the river mouth. Within a site a strip of land perpendicular to the river was selected for intensive grid sampling (40 by 20 m). Soil samples were taken at each grid node during the dry season of 1991. The relation between causal factors and soil salinization and acidification was determined at Macro and Meso levels by nested ANOVA and yielded a classification of the study area in main ecoregions and sub-environments within watershed. At a detailed scale, geostatistics were applied and zones within catena were defined in terms of their main soil characteristics. A nested statistical approach and geostatistics were used complementarily to disentangle the complexity of the causes of soil salinization and acidification.Temporal variability was studied by monitoring soil solution chemistry at each main landscape unit within the catena. Since the production of rice critically depends on the lowering of salinity and acidity by natural flooding during rainy season, time windows during which soil limitations are minimal were defined and matched with rice varietal duration.The response of rice to different improvement techniques were tested by means of a network of trials in the 1991 and 1992 rainy seasons. The residual effects of lime and phosphate rock (applied in 1991) during 1992 was also evaluated. Lime dressing (2 t ha -1) was found effective whenever dissolved Ca and Mg in the soil were low, and had a clear residual effect in the year after application. Application of phosphate rock did not seem to be effective in general. For iron toxicity, the molar fraction of Fe and (Ca + Mg) in soil solution and in flag leaves were found to be more relevant for diagnosing physiological disorders than the absolute Fe content in the soil solution and in rice flag leaves at panicle initiation.In the 1993 rainy season, rice varietal behavior under different improvement techniques within the main soil limitations in the mangrove environment was tested. Differences in yield and yield components and element contents in flag leaves at panicle initiation were observed between varieties in saline and less saline acid soils. Multiple correlation between rice yields, yield components, element contents in flag leaves at panicle initiation was found to be an effective diagnostic tool for assessing physiological disorders.The approach used in this study provides a logical framework to describe mangrove environments. The multiple-scale can assist in identifying the information required to cater for the needs of various decision-makers and land use planners. It also provides a key to develop technology packages for intensified and sustainable use. It can be used for the extrapolation of site-specific information to geographically different areas, with similar characteristics
L. C. Sylla [Material gráfico]
No full textResumen: Descripción: retrato de busto de Sylla basado en una esculturaDatos de publicación tomados de la obra a la que pertenec
Konstruierte Normalitäten - normale Abweichungen
No full textDer Sammelband vereint Beiträge der Tagung „Konstruierte Norm[alität][en] – normale Abweichung[en]“, die vom Konstanzer Netzwerk internationaler (Post-)Doktorandinnen organisiert wurde. Prozesse der Normbildungen und der Grenzziehung zwischen Normalitäten und Abweichungen werden in vier interdisziplinären Sektionen diskutiert. Die AutorInnen thematisieren normative Relationalität und Abhängigkeit von Kontexten wie Ort, Zeit, Raum, Kultur, Geschlecht oder Tradition sowie den Verlust ihrer Orientierungsfunktion in zunehmend pluralistischen Gesellschaften. Sie zeigen, wie die starke Individualisierung von Normen und Normalitäten zur Vervielfältigung der Abweichungen führt, die in neuen Normbildungsprozessen und der Konstruktion neuer Normalitäten münden und diese zugleich hinterfragen. Das Buch wendet sich an Dozierende und Studierende der Literaturwissenschaften, Linguistik, Gender Studies, Medienwissenschaften, Soziologie, Kulturwissenschaften, BWL, Psychologie sowie an LehrerInnen in Schul- und Erwachsenenbildung, SozialarbeiterInnen, Migrations- und Integrationsbeauftragte.
Il volume, che raccoglie contributi del convegno interdisciplinare „Konstruierte Norm[alität][en] – normale Abweichung[en], tenutosi all’Università di Konstanz, riflette sui processi dinamici che presiedono alla formazione dei concetti di “norma” e “normalità ”e al complesso rapporto tra la norma/normalità e le sue deviazioni in ambito sociale, culturale, letterario, linguistico ed economico. Gli autori e le autrici mettono in luce la stretta dipendenza delle norme dal contesto (storico, geografico, culturale, linguistico) e la progressiva perdita della loro funzione di orientamento nella società pluralista e dimostrano come non solo la sociologia e l’economia ma anche nella letteratura e nella linguistica la definizione delle norme porti a una proliferazione delle deviazioni dalle stesse, nonché a processi che tendono a formarne di nuove e alternative. Il volume si rivolge a docenti e studenti di letteratura, linguistica, Gender Studies, arti visive, sociologia, psicologica, economia e a insegnanti di scuola, assistenti sociali e mediatori culturali
Initial data identification in space dependent conservation laws and Hamilton-Jacobi equations
No full textConsider a Conservation Law and a Hamilton-Jacobi equation with a flux/Hamiltonian depending also on the space variable. We characterize first the attainable set of the two equations and, second, the set of initial data evolving at a prescribed time into a prescribed profile. An explicit example then shows the deep differences between the cases of x-independent and x-dependent fluxes/Hamiltonians
Dion Cassius et l'abdication de Sylla
No full textA quotation in Cassius Dio, who always pays particular attention to the institutions, allows us to confirm that Sulla had abdicated his dictature in the year 8 1 and to hypothesize that it was on the first of June.Un texte de Dion Cassius, qui porte toujours une attention particulière aux institutions, permet de confirmer que l'abdication par Sylla de sa dictature s'est produite en 81 et d'émettre l'hypothèse que ce fut le 1er juin.Hinard François. Dion Cassius et l'abdication de Sylla. In: Revue des Études Anciennes. Tome 101, 1999, n°3-4. pp. 427-432
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