648 research outputs found
Newly discovered cataclysmic variables from the INT/WFC photometric Hα survey of the northern Galactic plane
No full textWe report the discovery of 11 new cataclysmic variable (CV) candidates by the Isaac Newton Telescope (INT) Photometric H alpha Survey of the northern Galactic plane (IPHAS). Three of the systems have been the subject of further follow-up observations. For the CV candidates IPHAS J013031.90+622132.4 and J051814.34+294113.2, time-resolved optical spectroscopy has been obtained and radial-velocity measurements of the H alpha emission line have been used to estimate their orbital periods. A third CV candidate (IPHAS J062746.41+014811.3) was observed photometrically and found to be eclipsing. All three systems have orbital periods above the CV period gap of 2-3 h. We also highlight an other system, IPHAS J025827.88+635234.9, whose spectrum distinguishes it as a likely high-luminosity object with unusual C and N abundances
Monstrilla minuta Isaac 1974
No full text<i>Monstrilla minuta</i> and other species proposed by Isaac (1974a) <p> Suárez-Morales <i>et al.</i> (2013) and Suárez-Morales & McKinnon (2014) attributed <i>Monstrilla minuta</i> to “Isaac, 1975” without comment, but as Grygier (1995a) has noted, this name was made available by Isaac (1974a). To be precise, the following diagnostic statement from Isaac (1974a: 129), which also serves to explain the choice of the specific name, just barely fulfills Article 13.1.1 of the International Code of Zoological Nomenclature (ICZN 1999): “No monstrillid so small has previously been described.”</p> <p> With respect to all of the new species introduced by Isaac (1974a), Grygier (1995a: 43) wrote, “The new species in this paper were diagnosed very poorly, but one feature, at least, can be taken as characteristic of each one, so all are available.” Actually, the description of <i>Monstrillopsis sarsi</i> Isaac, 1974a included clear statements of differences in the natatory legs and copulatory appendage (<i>sic</i>; = the male genitalia) from those of <i>M. dubia</i> (Scott, 1904), so the availability of <i>M. sarsi</i> from this work is not problematic. Isaac’s (1974a) diagnostic statements for the remaining four nominal species are quoted below, but for the fourth, <i>Thaumaleus similirostratus</i>, further analysis shows that it was in fact not available from Isaac (1974a), but instead was made available in one of his later works.</p> <p> <b> <i>Thaumaleus pallidus</i> [now <i>Cymbasoma pallidum</i> (Isaac, 1974a)]:</b> “… the muscles of the body are the same characteristically pale grey, much lighter than those in any other monstrillid seen by the author.” (Isaac 1974a: 132).</p> <p> <b> <i>Thaumaleus tenuis</i> [now <i>Cymbasoma tenue</i> (Isaac, 1974a)]:</b> “The abdomen, especially when viewed from the side, appears to be drawn out, hence the name proposed.” (Isaac 1974a: 134). It is perhaps debatable whether this feature was intended to be understood as a distinguishing characteristic, but the statement itself is similar in quality to that accepted for both <i>Thaumaleus pallidus</i> and <i>Monstrilla minuta</i> above. If availability from Isaac (1974a) were rejected, Isaac (1975b: 7) treated the elongate body as a distinguishing feature of <i>T. tenuis</i> in a key while also providing two other features distinguishing this species from <i>T. quadridens</i> (Davis, 1947), so availability would shift to this later work.</p> <p> <b> <i>Thaumaleus striatus</i> [now <i>Cymbasoma striatum</i> (Isaac, 1974a)]:</b> “It is characterized by having very fine striations (only visible under high magnification) on the surface of the anterior half of the cephalothorax, running around the circumference.” (Isaac 1974a: 135).</p> <p> <b> <i>Thaumaleus similirostratus</i> [now <i>Cymbasoma similirostratum</i> (Isaac, 1974a)]:</b> “It is immediately distinguishable from any other monstrillid, with the exception of <i>Thaumaleus rostratus</i> (Scott, 1904), by the prolongation of the cephalothorax forward between the antennae” (Isaac 1974a: 131). With regard to this latter species, only the fact that different sexes of each were available (male for <i>T. similirostratus</i>, female for <i>T. rostratus</i>) was mentioned. With regard to the two sexes, one might argue that <i>T. similirostratus</i> Isaac, 1974 is unavailable under Article 11 for reason of having been proposed as a synonym, but the actual wording of the relevant proposition by Isaac (1974a: 131) was not so definite: “Only the female of <i>T. rostratus</i> has been described, and <i>it is possible</i> [our emphasis] that the specimen from the Lundy area [i.e., the holotype of <i>T. similirostratus</i>] is the male of this species.” Even so, this statement, combined with a subsequent discussion of “possible resemblance” in the urosomal segmentation, and with Isaac’s statement that “The name <i>Thaumaleus similirostratus</i> is proposed, however, until a female <i>T. rostatus</i> is obtained for comparison.” (p. 131), suggests instead that the description might violate Article 11.5 (names not used as valid when proposed are not available) or 15.1 (names proposed conditionally after 1960 are not available). We consider that Isaac (1974a) did use the name as valid, but in consideration of the definition of “conditional” in the Glossary of the Code, <i>viz.</i>, “made with stated reservations”, we conclude that <i>T. similirostratus</i> was proposed conditionally, and not made available from Isaac (1974a). Isaac (1975b) included this species in a key (p. 7), thus unambiguously distinguishing it from its (male) congeners, and in the list of species (p. 9) he added the notation, “Female unknown; possibly this species is the male of <i>T. rostratus</i>.” Since this annotation implies no conditionality, Article 15.1 does not apply and, consequently, the authorship of <i>T. similirostratus</i> is here formally attributed to Isaac (1975b).</p> <p> Grygier (1995a: 43, 45, 56, 76) misspelled this specific name as “ <i>similirostris</i> ”, spelling it correctly only on p. 45, several lines below one of the misspellings. This was not a deliberate emendation and “ <i>similirostris</i> ” is an incorrect subsequent spelling under Article 33 of the Code. As far as we know, nobody since has adopted the spelling “ <i>similirostris</i> ” for this nominal species.</p>Published as part of <i>Grygier, Mark J. & Suárez-Morales, Eduardo, 2018, Recognition and partial solution of nomenclatural issues involving copepods of the family Monstrillidae (Crustacea: Copepoda: Monstrilloida), pp. 497-509 in Zootaxa 4486 (4)</i> on page 499, DOI: 10.11646/zootaxa.4486.4.5, <a href="http://zenodo.org/record/1442306">http://zenodo.org/record/1442306</a>
The role of institutions in the development process of African countries
No full textThis paper examines the role of institutions in the development process of African countries. It has been shown that, whereas institutions have played a greater role in the economic development of several East Asian countries, in Africa they are weaker and ineffective because of poor enforcement of the rule of law, corruption, mismanagement, absence of strong civil society and political interference. It is argued that well-functioning institutions can promote growth and reduce poverty in Africa by providing a conducive environment for implementation and sustainable development programmes. Therefore, African countries should endeavor to establish effective, responsive and democratic institutions that will promote accountable and transparent governance and sustainable socioeconomic development.Africa, Developing countries, Economic development, Organizations
Canon Medicinae: Preliminary Edition of Book One (Fann One) of Avicenna's Canon of Medicine (Original Arabic text and Latin translation by Gerard of Cremona). القانون في الطب
No full textPreliminary edition of Book One, Fann One of Ibn Sīnā's al-Qānūn fī al-Ṭibb and of Gerard of Cremona's Latin translation. The edition has been carried out as part of Nicola Carpentieri's Research Project LATQAN (2020-2022). The text has been co-edited by Dr. Isaac Lampurlanes Farre (University of Padua) and Dr. Sherif Masry (Bibliotheca Alexandrina).
The Arabic manuscripts used for the Arabic text are:
B: BNF 2895 (Canon_d'Avicenne_Premier_livre_2895)
E: Escorial 822 (ESC. Ms. árabe 822)
L: Laurenziana 56 (Laurenziana- Orient 195).
The Latin manuscripts used for the edition are:
A: Milan, Biblioteca Ambrosiana, C292 Inf., fols 1ra-49rb (ca. 1200)
B: Angers, Bibliotheque municipale, 458, fols 1ra-111vb (ca. 1250)
L: Florence, Biblioteca Medicea Laurenziana, ms. Plut. 73-14, fols 1ra-61vb (1230-1240)
M: Madrid, Biblioteca Nacional de España, MSS/928, fols 1ra-34ra (1248-1250)
O: Oxford, Bodleian Library, Lat. Misc. c. 73, fols 79ra-91va (ca. 1240)
P: Paris, Bibliotheque Nationale de France, lat. 16186, fols 9ra-45vb (XIII century)
V: Vatican City, Biblioteca Apostolica Vaticana, Vat. lat. 2412, fols 1ra-72rb (1258)
Y: Munich, Bayerische Staatsbibliothek, clm 13017, fols 1ra-52vb (1246)
Z: Munich, Bayerische Staatsbibliothek, clm 14, fols 3ra-76rb (1250)
The LATQAN Project obtained the digital copies of manuscripts containing Book One of the Canon of Avicenna from twenty different libraries in countries around the world, thus gathering as completely as possible all copies of manuscripts containing this crucial historical text. Through careful compilation, our team has chosen the above core manuscripts. By doing this work, not only have we created public, searchable transcriptions of important texts hitherto available only as fragile, handwritten documents, we are also able to better understand the history of the transmission of this text.
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Multiplication operators on weighted Banach spaces of a tree
No full textWe study multiplication operators on the weighted Banach spaces of an
infinite tree. We characterize the bounded and the compact operators, as well
as determine the operator norm. In addition, we determine the spectrum of the
bounded multiplication operators and characterize the isometries. Finally, we
study the multiplication operators between the weighted Banach spaces and the
Lipschitz space by characterizing the bounded and the compact operators,
determine estimates on the operator norm, and show there are no isometries.Comment: Second author published under Isaac M. Crai
Distance and mean citation for first-last author relationship in three resolutions (100 m, 1 km, and 1000 km).
No full text<p>Distance and mean citation for first-last author relationship in three resolutions (100 m, 1 km, and 1000 km).</p
On the Sherlocks, Jane Coleman and County Kildare in the Eighteen Forties
No full textIn the late 1980s and early 1990s the author acquired about 30,000 letters written mainly in the 1840s. These pertained to estates throughout Ireland managed by the firm of James Robert Stewart and Joseph Kincaid, hereafter denoted SK. Until the letters – called the SK correspondence in what follows – became the author’s property, they had not seen light of day since the 1840s. Addressed mainly to the firm’s office in Dublin, they were written by landlords, tenants, the partners in SK, local agents, etc. After about 200 years in operation as a land agency, the firm in which members of the Stewart family were the principal partners – Messrs J. R. Stewart & Son(s) from the mid- 1880s onwards – ceased operations in the mid-1980s. Since 1994 the author has been researching the SK correspondence of the 1840s. It gives many new insights into economic and social conditions in Ireland during the decade of the great famine, and into the operation of Ireland’s most important land agency during those years. It is intended ultimately to publish details on several of the estates managed by SK in a study more comprehensive than the present article, in book form. The proposed title is Landlords, tenants, famine: business of an Irish land agency in the 1840s, a draft of which has now been completed. A majority of the letters in that study are on themes some of which one might expect - rents, distraint (seizure of assets in lieu of rent); ‘voluntary’ surrender of land in return for ‘compensation’ upon quitting quietly; formal ejectment (a matter of last resort on estates managed by SK); landlordassisted emigration (on a scale much more extensive than most historians of Ireland in the 1840s appear to believe); petitions from tenants; complaints by tenants, both about other tenants and about local agents; landlord-financed and other relief of distress both before and during the great famine; major works of improvement (on almost all of the estates managed by SK which have been investigated in detail in the draft book); applications by SK, on behalf of landlords, for government loans to finance improvements; recommendations of agricultural advisers hired by SK, etc. Thus, most of the SK correspondence is about aspects of estate management. But the firm of SK was not only a manager of land. The correspondence reveals only two estates in Kildare, each of them relatively small, managed by SK in the 1840s. These were the lands of the Sherlocks near Naas and of Jane Coleman in the Kilcullen district. The correspondence on these properties differs substantively from most of those discussed in detail in the draft of Landlords, tenants, famine: first, it is relatively small in quantity, and secondly, it contains relatively little on the core aspects of estate management indicated above. Much of that on the Sherlocks focuses on misfortunes among family members, while the correspondence on Jane Coleman highlights the benevolence of that proprietor.
Conditional Disclosure of Secrets, Private Information Retrieval, [and] Private Simultaneous Messages
No full textThesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (pages 52-53).Private Information Retrieval is the problem of querying two servers to nd a value in a database, while keeping the index private. We extend this problem to Generalized Wildcard PIR, where we instead query an aggregate of the entries whose indices match a pattern, called a generalized wildcard, which species what values each segment of the indices may take. We give a construction for this variant with similar communication to that of the best PIR protocols known. We study information theoretic models in cryptography, namely Private Information Retrieval, Conditional Disclosure of Secrets, and Private Simultaneous Messages. We give extensions of PIR and CDS in the area of generalized wildcards, and give constructions for those extensions. We discuss directions towards more ecient protocols, and raise open questions.by Isaac Grosof.M. Eng
Antonio M. Abad. La oveja de Nathán: Una novela filipina/Nathan’s Sheep: A Philippine Novel. Translated by Lourdes Castrillo Brillantes, with Lilia Ramos de Leon and Edgardo Tiamson. Consultant for Spanish text, Isaac Donoso Jimenez. Makati City: Georgina Padilla y Zóbel, Filipinas Heritage Library, and Ayala Foundation Inc., 2013. 642 pages.
No full textExcerpt: We are in luck. This year the Premio Zobel Collection recovers the novel of Filipino writer Antonio M. Abad, La oveja de Nathán, in a meticulously prepared bilingual Spanish-English edition by Lourdes Castrillo Brillantes and Isaac Donoso. Written in Spanish by Antonio M. Abad (born in 1894 in Barili, Cebu) and published in instalments in the Manila serial La Opinión, it won the Premio Zobel in 1929, which annually was given to the best literary work written in Spanish by a Filipino author
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