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Search Results: 1 - 10 of 1810 matches for " Jordan Golubov "
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The Paradox of Mesquites (Prosopis SPP):Invading Especies or Biodiversity Enhancers?
Jordan Golubov,María C. Mandujano,Luis E. Eguiarte
Boletín de la Sociedad Botánica de México , 2001,
Una nueva especie de Mammillaria (Cactaceae) para Tamaulipas, México
Martínez -ávalos, José Guadalupe;Golubov, Jordan;Arias, Salvador;Villarreal-Quintanilla, José ángel;
Acta botánica mexicana , 2011,
Abstract: mammillaria cielensis (cactaceae), a new species of cactaceae from "el cielo" biosphere reserve (rbc) in tamaulipas, mexico, is described and illustrated. the new species is similar to m. zublerae repp., differing from this species in the size of the stem, the rounded form of the apex, the smaller tubercles, the areoles with white wool, the more numerous and somewhat shorter radial and central spines, the colour and size of the fruits, the shinier and larger seeds, with heavily pitted and slightly reticulate testa, and larger hilum. its known distribution is restricted to pine oak forest in the rbc, in the southern part of the state of tamaulipas, mexico. a comparison with related species is presented.
José Guadalupe Martínez-ávalos,Jordan Golubov,Salvador Arias,José ángel Villarreal-Quintanilla
Acta botánica mexicana , 2011,
Abstract: Se propone a Mammillaria cielensis (Cactaceae), como una especie nueva de la Reserva de la Biosfera "El Cielo" (RBC) en Tamaulipas, México. Es morfológicamente muy similar a M. zublerae Repp., de la cual difiere en el tama o del tallo, la forma redondeada del ápice, los tubérculos de menor tama o y glabros, aréolas con lana blanca, las espinas radiales y centrales más numerosas y ligeramente más cortas, frutos de diferente color y tama o, la semilla de mayor tama o, con testa porosa y el hilo de mayores dimensiones. Su distribución conocida se restringe al bosque de pino encino en el área de la RBC, al sur del estado de Tamaulipas, México. Se presenta una comparación con las especies afines.
Tendencias y transformaciones en el sistema de educación superior en Estados Unidos para afroamericanos e hispanos
Golubov, Nattie;
Revista electrónica de investigación educativa , 2008,
Abstract: using a wide variety of statistical sources, particularly those created by government agencies in the united states of america (usa), this article offers a descriptive overview of the insertion of ethnic and racial minorities in the usa higher education system. this process illustrates more profound and general changes within usa society, which have a specific though not exclusive origin in the social transformations that began in the 1960's and were consolidated in the 1970's. these changes gave rise to a new polítical, social and cultural space for african-americans, who waged a powerful battle to gain political and civil rights, which were then extended to the hispanic population.
Feeding on alterity: reading in the knowledge society
Nattie Golubov
Trans : Revue de Littérature Générale et Comparée , 2007,
Abstract: Ce court essai met en relation deux événements : l’émergence du paradigme de la société du savoir comme modèle souhaitable de développement social et économique, et l’exercice critique appelé ici lecture lente . Il postule que la lecture attentive et détaillée des textes littéraires interrompt et perturbe la temporalité caractéristique du capitalisme tardif, puisqu’il suspend son mouvement par le biais d’une pause qui fournit un espace pour une rencontre morale et politiquement responsable avec le monde de la littérature. Este breve ensayo pondera la relación entre dos acontecimientos : la aparición del paradigma de la sociedad del conocimiento como un modelo deseable de desarrollo social y económico, y el ejercicio crítico llamado aquí la “lectura lenta”. En el texto se comenta el hecho de que la lectura atenta y detallada de textos literarios interrumpe y perturba la temporalidad característica del capitalismo tardío porque suspende su movimiento al introducir una pausa, proporcionando así un espacio para el encuentro moral y políticamente responsable con el mundo de la literatura.
Interface resistance in ferromagnet/superconductor junctions
A. A. Golubov
Physics , 1999, DOI: 10.1016/S0921-4534(99)00370-6
Abstract: Results of theoretical study of spin-polarized tunneling in ferromagnet/superconductor junctions are presented. Spin and charge currents are calculated as a function of applied voltage and spin polarization in a ferromagnet. The model takes into account the splitting of different spin subbands in a ferromagnet and impurity scattering in the contact. The excess resistance of an FS contact due to the charge-imbalance in a superconductor is calculated for the first time. The results have implications for spin-coupled magnetoresistance in ferromagnet/superconductor contacts and for measuring spin polarization in ferromagnets.
Further Properties of Reproducing Graphs  [PDF]
Jonathan Jordan, Richard Southwell
Applied Mathematics (AM) , 2010, DOI: 10.4236/am.2010.15045
Abstract: Many real world networks grow because their elements get replicated. Previously Southwell and Cannings introduced a class of models within which networks change because the vertices within them reproduce. This happens deterministically so each vertex simultaneously produces an offspring every update. These offspring could represent individuals, companies, proteins or websites. The connections given to these offspring depend upon their parent’s connectivity much as a child is likely to interact with their parent’s friends or a new website may copy the links of pre-existing one. In this paper we further investigate one particular model, ‘model 3’, where offspring connect to their parent and parent’s neighbours. This model has some particularly interesting features, including a degree distribution with an interesting fractal-like form, and was introduced independently under the name Iterated Local Transitivity by Bonato et al. In particular we show connections between this degree distribution and the theory of integer partitions and show that this can be used to explain some of the features of the degree distribution; we give exact formulae for the number of complete subgraphs and the global clustering coefficient and we show how to calculate the minimal cycle basis.
A Comparative Analysis of MMPI and Rorschach Findings Assessing Combat-Related PTSD in Vietnam Veterans—Analysis of MMPI and Rorschach Findings Assessing PTSD  [PDF]
Ioanna Katsounari, Jordan Jacobowitz
Psychology (PSYCH) , 2011, DOI: 10.4236/psych.2011.24053
Abstract: There has been a proliferation of assessment research on Post-traumatic Stress Disorder (PTSD) over the past twenty years. In spite of recent advances in the PTSD assessment research, there continues to be a controversy as to whether the MMPI or Rorschach is more useful in determining the presence of PTSD. The present comparative analysis of the research literature will carefully evaluate controlled empirical studies, which utilized psychometric measures such as the MMPI/2 and Rorschach to identify PTSD in Vietnam Veterans. This analysis is guided by the paucity of comparative data for standardized objective and projective instruments to assess combat-related PTSD. The analysis indicated that the MMPI as an assessment instrument focuses on symptom recognition of PTSD while the Rorschach seems to be more likely to identify chronic adaptations to trauma. The significance of pre-combat factors, such as preexisting personality, and their impact on the way individuals make meaning and express traumatic experiences needs to be further addressed in future research. The need for reliable and valid measures to assess combat-related PTSD is urgent as an increasing number of soldiers return from war zones.
Maximizing Sampling Efficiency  [PDF]
Harmon S. Jordan
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.411209
Abstract: Background and Goals: Although health care quality improvement has traditionally involved extensive work with paper records, the adoption of health information technology has increased the use of electronic record and administrative systems. Despite these advances, quality improvement practitioners now and for the foreseeable future need guidance in defining populations of individuals for study and in selecting and analyzing sample data from such populations. Statistical data analysis in health care research often involves using samples to make inferences about populations. The investigator needs to consider the goals of the study, whether sampling is to be used, and the type of population being studied. While there are numerous sampling strategies designed to conserve resources and yield accurate results, one of these techniques—use of the finite population correction (FPC)—has received relatively little attention in health care sampling contexts. It is important for health care quality practitioners to be aware of sampling options that may increase accuracy and conserve resources. This article describes common sampling situations in which the issue of the finite population correction decision often arises. Methods: This article describes 3 relevant sampling situations that influence the design and analysis phases of a study and offers guidance for choosing the most effective and efficient design. Situation 1: The study or activity involves taking a sample from a large finite target population for which enumerative inferences are needed. Situation 2: The population is finite and the study is enumerative. A complete enumerative count of “defects” in the process is needed so that remediation can occur. Here, statistical inference is unnecessary. Situation 3: The target population is viewed as infinite; such populations are “conceptual populations” [1] or “processes”. Results: The article shows how savings in resources can be achieved by choosing the correct analytic framework at the conceptualization phase of study design. Choosing the right sampling approach can produce accurate results at lower costs. Several examples are presented and the implications for health services research are discussed. Conclusion: By clearly specifying the objectives of a
Crossed Andreev reflection in diffusive contacts
A. Brinkman,A. A. Golubov
Physics , 2006, DOI: 10.1103/PhysRevB.74.214512
Abstract: Crossed Andreev reflection in multiterminal structures in the diffusive regime is addressed within the quasiclassical Keldysh-Usadel formalism. The elastic cotunneling and crossed Andreev reflection of quasiparticles give nonlocal currents and voltages (depending on the actual biasing of the devices) by virtue of the induced proximity effect in the normal metal electrodes. The magnitude of the nonlocal processes is found to scale with the square of the barrier transparency and to decay exponentially with interface spacing. Nonlocal cotunneling and crossed Andreev conductances are found to contribute equally to the nonlocal current, which is of relevance to the use of normal metal-superconducting heterostructures as sources of entanglement.
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