31 research outputs found
4NQO Carcinogenesis: A Model of Oral Squamous Cell Carcinoma
No full textMartinez, CAR (reprint author), Univ Talca, Edificio Dept Ciencias Basicas Biomed, Ave Lircay S-N,Oficina 1, Talca, Chile.The experimental oral carcinogenesis induced by the chemical 4-nitroquinoline 1-oxide (4NQO) is one of the most frequent in the study of squamous cell carcinoma of the oral cavity (CCEC). The clear advantage is that the model is very similar to the physiological process of malignancy. The model has clear benefits by and is suitable for applications in therapeutic research
Monitors: An Operating System Structuring Concept
No full textThis is a digitized copy derived from an ACM copyrighted work. It is not guaranteed to be an accurate copy of the author's original work. This paper develops Brinch-Hansen's concept of a monitor as a method of structuring an operating system. It introduces a form of synchronization, describes a possible rnctltotl of implementation in terms of semaphorcs and gives a suitable proof rule. Illustrative examples include a single rcsourcc scheduler, a bounded buffer, an alarm clock, a buffer pool, a disk head optimizer, and a version of the problem of readers and writers. Key Words and Phrases: monitors, operating systems,schcduling, mutual exclusion, synchronization, system implementation langua yes, structured multiprogramming CR Categories
Comparative analysis of forest buffalo grouping patterns in Central Africa
No full textPresented at the 9th international wildlife ranching symposium: wildlife - the key to prosperity for rural communities, held on 12-16 September 2016 at Hotel Safari & the Safari Court, Windhoek, Namibia in conjuction with the IUCN 2nd African Buffalo Symposium.Understanding the social organization of elusive forest-dwelling ungulates may have important conservation and management implications. We present a comparison of grouping patterns in forest buffalo across different sites and through time in Central African rainforest. We examined five sites: Mbeli Bai and Bonye Bai (Nouabalé-Ndoki National Park, Republic of Congo), Dzanga Bai and Bai-Hokou (Dzanga-Ndoki National Park, C.A.R.) and Lopé-Okanda National Park (Gabon).Buffalo showed high site fidelity to open areas, including forest clearings. Forest buffalo herds (mean 12 ind. ± SD; range 3-24) were much smaller than records of savanna buffalo herds (mean 350 ind. ± SD; range 12-1500>), but also showed frequently fission-fusion patterns. Data from Mbeli Bai collected from 2012 to 2016confirm a stable presence of two buffalo herds (range 9-10 ind.) with occasional visits by lone individuals. Observations from Dzanga Bai over a period of 10 years (2006-2016) confirm the occurrence of only one buffalo herd (range 8-10ind.). In Bai-Hokou site, a single buffalo herd increased from 16 to 24 individuals during a three year period (2001-2004). Finally in Lopé National Park (a mosaic of savanna and forest fragments), the mean group size for 18 herds monitored from2002 to 2004 was 12±2 ind. (range of means=3–24). We analysed if herd size and herd stability are affected by clearing size, clearing type (e.g. marsh or land) and grass coverage across different sites and through time
Community Assistance for Refugees and Gender Roles: What Could Make this C.A.R. run Better?
No full textI/We certify have followed the accepted standards of scientific, creative, and academic honesty and ethics. I understand that my article submission will be blind-reviewed by faculty reviewers who will recommend acceptance for publication; acceptance with revisions; or reject for publication. I understand that as author, I retain the right to present any part of the research in any form in other publications. The JUR has the right to reproduce and reprint published submissions for instructional or promotional purposes. Mentor Agreement: I have reviewed the submission, and I support its inclusion in the JUR (The Journal of Undergraduate Research at Minnesota State University, Mankato). I understand that I will be acknowledged as the faculty mentor for the student author(s). To the best of my knowledge, the student has followed th
Can agrodealers be agents of sustainability transitions in agriculture? Reflections based on the expansion of biological inputs in Mexico
No full textAgrodealers are key players in providing technologies and support services to farmers. Nevertheless, they are generally perceived as reluctant, or at least inactive, in the transition to more sustainable practices. In this article, we examine their contribution to the expansion of biological inputs - biological control, biofertilizers, biostimulants - understood as a set of alternative technologies for reducing the consumption of chemical inputs. Based on a qualitative survey of agrodealers and various agricultural R&D stakeholders in Mexico's Bajio grainproduction region, we show that they play a proactive role in the expansion of these technologies. Faced with a highly competitive environment, including these products in their portfolio enables them to differentiate themselves from their competitors, while continuing to promote the productivity and profitability of their crops to their customers. In some cases, they not only distribute the products of upstream industries, but also become producers themselves of the microorganisms they offer for sale. They are also actively involved in encouraging farmers to acquire and use these technologies, while striving to minimize the disruption that this may cause to their practices. To this end, they provide advice and support, and develop formulas for integrating biological inputs into technical packages that facilitate their adoption. These results call for a reconsideration of the role these actors could play in initiatives aimed at promoting sustainable technologies and practices for the agricultural sector
HKT geometry and de Sitter supergravity
No full textSolutions of five-dimensional minimal de Sitter supergravity admitting Killing spinors are considered. It is shown that the timelike solutions are determined in terms of a four-dimensional hyper-Kähler torsion (HKT) manifold. If the HKT manifold is conformally hyper-Kähler the most general solution can be obtained from a sub-class of supersymmetric solutions of minimal N = 2 ungauged supergravity, by means of a simple transformation. Examples include a multi-BMPV de Sitter solution, describing multiple rotating black holes co-moving with the expansion of the universe. If the HKT manifold is not conformally hyper-Kähler, examples admitting a tri-holomorphic Killing vector field are constructed in terms of certain solutions of three-dimensional Einstein-Weyl geometry. © 2008 Elsevier B.V. All rights reserved.ALVAREZGAUME L, 1981, COMMUN MATH PHYS, V80, P443, DOI 10.1007-BF01208280; Behrndt K, 2004, CLASSICAL QUANT GRAV, V21, P4107, DOI 10.1088-0264-9381-21-17-006; Behrndt K, 2003, CLASSICAL QUANT GRAV, V20, P4177, DOI 10.1088-0264-9381-20-19-304; Bergshoeff Eric A, 2007, JHEP-Journal of High Energy Physics, DOI 10.1088-1126-6708-2007-07-067; BRAATEN E, 1985, NUCL PHYS B, V260, P630, DOI 10.1016-0550-3213(85)90053-7; Breckenridge JC, 1997, PHYS LETT B, V391, P93, DOI 10.1016-S0370-2693(96)01460-8; Cacciatori S.L., 2007, JHEP, V0707, P046; CALLAN CG, 1991, NUCL PHYS B, V359, P611, DOI 10.1016-0550-3213(91)90074-8; CANDELAS P, 1985, NUCL PHYS B, V258, P46, DOI 10.1016-0550-3213(85)90602-9; Chave T, 1996, PHYS LETT B, V383, P262, DOI 10.1016-0370-2693(96)00760-5; Chen W, 2006, NUCL PHYS B, V732, P118, DOI 10.1016-j.nuclphysb.2005.10.018; CURTRIGHT TL, 1984, PHYS REV LETT, V53, P1799, DOI 10.1103-PhysRevLett.53.1799; DELDUC F, 1993, CLASSICAL QUANT GRAV, V10, P1201, DOI 10.1088-0264-9381-10-7-003; Elvang H, 2004, PHYS REV LETT, V93, DOI 10.1103-PhysRevLett.93.211302; FIGUERAS P, 2006, JHEP, V611, P36; Gauduchon P, 1998, J GEOM PHYS, V25, P291, DOI 10.1016-S0393-0440(97)00032-6; Gauntlett JP, 2003, CLASSICAL QUANT GRAV, V20, P4587, DOI 10.1088-0264-9381-20-21-005; Gauntlett JP, 2003, PHYS REV D, V68, DOI 10.1103-PhysRevD.68.105009; Gauntlett JP, 1999, CLASSICAL QUANT GRAV, V16, P1, DOI 10.1088-0264-9381-16-1-001; Gauntlett JP, 2004, PHYS REV D, V70, DOI 10.1103-PhysRevD.70.089901; Gibbons GW, 1997, NUCL PHYS B, V508, P623, DOI 10.1016-S0550-3213(97)00599-3; GIBBONS GW, 1978, PHYS LETT B, V78, P430, DOI 10.1016-0370-2693(78)90478-1; Gibbons GW, 2005, PHYS REV LETT, V94, DOI 10.1103-PhysRevLett.94.131602; Gillard J, 2005, CLASSICAL QUANT GRAV, V22, P1033, DOI 10.1088-0264-9381-22-6-009; GRAN U, 2007, JHEP, V702, P43; Gran U, 2005, CLASSICAL QUANT GRAV, V22, P2453, DOI 10.1088-0264-9381-22-12-010; GRAN U, 2007, JHEP, V702, P44; Gran U., 2007, JHEP, V0708, P074; GRAN U, ARXIV08021799; GROVER J, ARXIV08020231; Gutowski J, 2000, PHYS LETT B, V472, P45, DOI 10.1016-S0370-2693(99)01412-4; Herdeiro CAR, 2003, NUCL PHYS B, V665, P189, DOI 10.1016-S0550-3213(03)00484-X; HOWE PS, 1987, NUCL PHYS B, V289, P264, DOI 10.1016-0550-3213(87)90380-4; HOWE PS, 1988, CLASSICAL QUANT GRAV, V5, P1647, DOI 10.1088-0264-9381-5-12-014; HULL CM, 1986, LECT NONLINEAR SIGMA; HULL CM, 1998, JHEP, V9807, P21; KASTOR D, 1993, PHYS REV D, V47, P5370, DOI 10.1103-PhysRevD.47.5370; KLEMM D, 2001, JHEP, V102, P31; Liu JT, 2001, PHYS LETT B, V498, P123, DOI 10.1016-S0370-2693(00)01350-2; LIU JT, 2004, JHEP, V401, P7; LUKIERSKI J, 1985, PHYS LETT B, V151, P382, DOI 10.1016-0370-2693(85)91659-4; PAPADOPOULOS G, 1995, PHYS LETT B, V356, P249, DOI 10.1016-0370-2693(95)00756-B; PILCH K, 1985, COMMUN MATH PHYS, V98, P105, DOI 10.1007-BF01211046; SKENDERIS K, ARXIV07043918; Skenderis K, 2006, PHYS REV LETT, V96, DOI 10.1103-PhysRevLett.96.191301; Vaula S, 2007, PHYS LETT B, V653, P95, DOI 10.1016-j.physletb.2007.07.048; WITTEN E, 1984, COMMUN MATH PHYS, V92, P455, DOI 10.1007-BF01215276; ZUMINO B, 1979, PHYS LETT B, V87, P203, DOI 10.1016-0370-2693(79)90964-X24202
Edició crítica, traducció i estudi de l'Ars gromatica siue Geometria Gisemundi
No full textAquesta tesi presenta la primera edició crítica completa del tractat de Gisemund sobre l'art gromàtica o geometria, realitzada a partir dels testimonis directes (manuscrits Ripoll 106, ACA i París BN 8812) així com les fonts indirectes conegudes en què es basà el seu autor (bàsicament obres del Corpus Agrimensorum Romanorum, la Geometria I de Pseudoboeci i Orosi). L'edició es presenta amb els habituals praefatio, stemma codicum i conspectus notarum redactats en llatí i un complet aparat crític amb indicació de les fonts directes, les edicions anteriors i les fonts indirectes corresponents a cada passatge, així com de les variants textuals en totes les fonts. S'acompanya d'una traducció catalana amb notes aclaratòries, presentada en format d'edició bilingüe, i va precedida d'una introducció i estudi del seu contingut. En aquesta introducció s'explica la història de la transmissió del text, els anteriors estudis i edicions parcials de l'obra i el procés d'edició. També en aquest apartat es fan algunes aportacions al respecte del seu contingut en quatre aspectes fonamentals: 1- L'aportació de l'obra al coneixement del C.A.R. 2- Una nova visió sobre la qüestió de les Casae Litterarum. 3- Una anàlisi del contingut històric de la Discriptio Hispaniae. 4- Algunes observacions sobre la llengua i l'estil de Gisemund.This thesis presents the first complete critical edition of Gisemundus' treatise about gromatic art or geometry, carried out from direct sources (manuscripts: Ripoll 106, ACA and Paris BN 8812) and also indirect sources, those known to us, on wich the author based his work (especially the Corpus Agrimensorum Romanorum, Pseudoboethius' Geometria I and Orosius). Our edition offers a praefatio, stemma codicum and conspectus notarum, all written in latin as usual, and a rich critical apparatus wich gives indication of direct sources, previous editions and indirect sources referred to every passage, followed by textual readings in all sources. We also offer a catalan translation with notes, in a bilingual edition format, and it is preceded by an introduction and a study of the work's content. In this introduction we explain the historical transmission of this text, the previous studies and parcial edtions of the work and our edition process. Along this introduction some contribution is made on four important issues: 1- This treatise's contribution to the knowledge of C.A.R. 2- A new vision of the question of Casae Litterarum. 3- An analysis of the historical content of the Discriptio Hispaniae. 4- A few remarks about Gisemundus' language and style
Considerations of uncertainty in robust optimisation of electromagnetic devices
No full textDue to unavoidable uncertainties related to material properties and manufacturing processes, the robustness of the optimal solution must be considered when designing electromagnetic devices. In this paper, the worst-case optimisation (WCO) and the worst-vertex-based WCO are proposed to evaluate the robustness of both performance and constraints under uncertainty. To reduce computing times when searching for the robust solution a predicted objective function is used, obtained with the help of a kriging algorithm which explores the searching space using the concept of rewards. Finally, to avoid some of the shortcomings of WCO, the concept of average performance evaluation is developed
Edició crítica, traducció i estudi de L'ARS GROMATICA siue geometria gisemvndi
No full textAquesta tesi presenta la primera edició crítica completa del tractat de Gisemund sobre l'art gromàtica o geometria, realitzada a partir dels testimonis directes (manuscrits Ripoll 106, ACA i París BN 8812) així com les fonts indirectes conegudes en què es basà el seu autor (bàsicament obres del Corpus Agrimensorum Romanorum, la Geometria I de Pseudoboeci i Orosi).
L'edició es presenta amb els habituals praefatio, stemma codicum i conspectus notarum redactats en llatí i un complet aparat crític amb indicació de les fonts directes, les edicions anteriors i les fonts indirectes corresponents a cada passatge, així com de les variants textuals en totes les fonts.
S'acompanya d'una traducció catalana amb notes aclaratòries, presentada en format d'edició bilingüe, i va precedida d'una introducció i estudi del seu contingut.
En aquesta introducció s'explica la història de la transmissió del text, els anteriors estudis i edicions parcials de l'obra i el procés d'edició. També en aquest apartat es fan algunes aportacions al respecte del seu contingut en quatre aspectes fonamentals:
1- L'aportació de l'obra al coneixement del C.A.R.
2- Una nova visió sobre la qüestió de les Casae Litterarum.
3- Una anàlisi del contingut històric de la Discriptio Hispaniae.
4- Algunes observacions sobre la llengua i l'estil de Gisemund.This thesis presents the first complete critical edition of Gisemundus' treatise about gromatic art or geometry, carried out from direct sources (manuscripts: Ripoll 106, ACA and Paris BN 8812) and also indirect sources, those known to us, on wich the author based his work (especially the Corpus Agrimensorum Romanorum, Pseudoboethius' Geometria I and Orosius).
Our edition offers a praefatio, stemma codicum and conspectus notarum, all written in latin as usual, and a rich critical apparatus wich gives indication of direct sources, previous editions and indirect sources referred to every passage, followed by textual readings in all sources.
We also offer a catalan translation with notes, in a bilingual edition format, and it is preceded by an introduction and a study of the work's content.
In this introduction we explain the historical transmission of this text, the previous studies and parcial edtions of the work and our edition process. Along this introduction some contribution is made on four important issues:
1- This treatise's contribution to the knowledge of C.A.R.
2- A new vision of the question of Casae Litterarum.
3- An analysis of the historical content of the Discriptio Hispaniae.
4- A few remarks about Gisemundus' language and style
The EXACT description of biomedical protocols
No full text© 2008 The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.Motivation: Many published manuscripts contain experiment protocols which are poorly described or deficient in information. This means that the published results are very hard or impossible to repeat. This problem is being made worse by the increasing complexity of high-throughput/automated methods. There is therefore a growing need to represent experiment protocols in an efficient and unambiguous way.
Results: We have developed the Experiment ACTions (EXACT) ontology as the basis of a method of representing biological laboratory protocols. We provide example protocols that have been formalized using EXACT, and demonstrate the advantages and opportunities created by using this formalization. We argue that the use of EXACT will result in the publication of protocols with increased clarity and usefulness to the scientific community.
Availability: The ontology, examples and code can be downloaded from http://www.aber.ac.uk/compsci/Research/bio/dss/EXACT/RC UK, RAEng/EPSRC, and
BBSRC
