102,028 research outputs found
Efecto del lombriabono en el cultivo de avena forrajera mantaro 15 mejorado y urano en la comunidad de Pampalanya – Huancavelica
No full textLa investigación se realizó en la comunidad campesina de Pampalanya, del distrito de Huando en la región Huancavelica – Perú. El objetivo fue determinar el efecto del lombriabono con tres niveles (0; 5; 10 t/ha), en el cultivo de la avena forrajera Mantaro 15 Mejorado y Urano, se utilizó el diseño completamente al azar con arreglo factorial 2 x 3 y en análisis de variancia que evidenciaron significación, se utilizó la prueba de Tukey. El rendimiento de biomasa fue altamente significativa (P≥0,01), con el uso de 0 ; 5 y 10 t/ha del lombriabono, siendo para la variedad Mantaro 15 Mejorado 7,303±0,550; 8,648±0,471 y 9,237±0,572 kg/m2 respectivamente; mientras en la variedad Urano 6,394±0,453; 7,454±0,542 y 8,123±0,311 kg/m2 respectivamente. El rendimiento de materia seca fue estadísticamente significativa (P≥0,01), con el uso de niveles del lombriabono, siendo en la variedad Mantaro 15 Mejorado 2,57±0,20; 3,62±0,18 y 4,45±0,22 kg/m2 y en la variedad Urano 2,39±0,14; 3,39±0,26 y 3,94±0,17 kg/m2 respectivamente. La altura de planta no incrementó significativamente con el uso del lombriabono (P≤0,01), obteniéndose en la variedad Mantaro 15 Mejorado 154,88±2,98; 157,18±1,64 y 159,20±0,96 cm, mientras en la variedad Urano incrementó significativamente 104,58±3,46; 114,85±2,93 y 118,73±1,54 cm respectivamente. El rendimiento de proteína total fue estadísticamente significativa (P≥0,01), con la fertilización de 0; 5 y 10 t/ha del lombriabono, siendo en la variedad Mantaro 15 Mejorado 0,088±0,009; 0,157±0,009 y 0,263±0,014 kg/m2 y en la variedad Urano 0,081±0,003; 0,147±0,012 y 0,231±0,012 kg/m2 respectivamente. La retribución económica tras el uso de tres niveles de lombriabono en la variedad Mantaro 15 Mejorado fue 16 322,20; 18 180,20 y 18 343,80 soles respectivamente, mientras en la variedad Urano 14 140,60; 15 314,60 y 15 670,20 soles respectivamente. Se concluye que este cultivo responde mejor a la dosis de 10 t/ha de lombriabono en producción de forraje verde, materia seca, valor nutritivo y retribución económica en la variedad Mantaro 15 Mejorado.Tesi
Letter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
Les pyroxénites à urano-thorianite du sud-est de Madagascar : conditions physico-chimiques de la métasomatose
No full textIn the Proterozoïc of granulite facies in S-E Madagascar the urano-thorianite bearing rocks are part of a clinopyroxene-rich calc-magnesian complex (the so-called "pyroxenites"). The rocks are produced by the metamorphic/metasomatic alteration (ca. 500-600 M.y. ?) of limestones and marls. By metasomatism K, Na, Fe and in some cases Ca are lost by the rocks ; Mg and Si are gained.
The parageneses exhibited by the surrounding gneisses, leptynites and marbles as well as the Fe-Mg distribution in the pairs cordierite-garnet and cordierite-spinel constrain as follows the conditions for the main phase of regional metamorphism : T = 700-750°C ; PF ⋍ 5 kbar ; CO2 concentrations often high in the fluid phase. Similar temperatures are deduced from the scapolite-plagioclase equilibrium in the pyroxenites. Evidences of an older metamorphic phase of higher temperature (T ≥ 780°C) are locally observed.
The clinopyroxenes compositions are near the diopside-Ca-tschermak (CaTs) join and show very high Al-content (up to 15.8 % AI2O3). The CaTs-content of the clinopyroxene varies according to the parageneses : below 2 % in the unusual quartz-bearing rocks (no urano-thorianite) ; 2-6 % with scapolite/plagioclase ; more than 6 % in amphibole (fluor-pargasite-rich)-bearing rocks ; from 10-11% to near 30% in spinel-bearing rocks with amphibole or scapolite/plagioclase. The CaTs-content of the clinopyroxene is clearly dependent on the silica activity in the fluid phase. It is shown that this one may have been as low as below 0.10 the silica activity for quartz-saturation in the same P-T-XCO2 conditions. The results are coherent with the required conditions for the stability of a Th-rich (Th/U > 1) urano-thorianite as they are shown by recent experimental work in the system UO2-ThO2-SiO2.Dans le Protérozoïque de faciès granulite du Sud-Est de Madagascar, l' urano-thorianite est un minéral de roches calcomagnésiennes riches en clinopyroxène ("pyroxénites") qui résultent du métamorphisme (à 500-600 M.a. ?) de calcaires et de marnes, accompagné d'importants échanges métasomatiques : départ des alcalins, de Fe, parfois de Ca ; apport de Mg et Si.
Les paragenèses minérales dans les gneiss, leptynites et marbres environnants et le partage de Fe et Mg entre cordiérite-grenat et cordiérite-spinelle conduisent à T = 700-750°C, PF ⋍ 5 kbar et XCO2 souvent élevée pour la phase majeure du métamorphisme régional. Dans les pyroxénites, l'équilibre scapolite-plagioclase indique les mêmes températures. On observe localement les témoins d'une phase métamorphique antérieure, de plus haute température (T ≥ 780°C).
Les clinopyroxènes sont proches de la série diopside-Ca-tschermak (CaTs) avec des concentrations très élevées en Al (jusqu'à 15,8 % AI2O3). La concentration en CaTs du clinopyroxène varie selon les paragenèses : moins de 2 % pour les rares roches (non minéralisées) à quartz ; 2 à 6 % avec scapolite/plagioclase ; plus de 6 % pour les roches à amphibole (riche en fluor-pargasite) : de 10-11 % à près de 30 % pour les roches à spinelle et amphibole ou scapolite/plagioclase. La concentration en CaTs est ici très nettement dépendante de l'activité de la silice en solution. On montre que celle-ci a pu s'abaisser jusqu'à moins de 1/10 de sa valeur pour la saturation en quartz.
Ces résultats sont en accord avec les conditions de stabilité de l'urano-thorianite à Th/U > 1 telles qu'elles ont été récemment définies par les travaux expérimentaux dans le système UO2-ThO2-SiO2.Moine Bernard, Rakotondratsima Charles, Cuney Michel. Les pyroxénites à urano-thorianite du sud-est de Madagascar : conditions physico-chimiques de la métasomatose. In: Bulletin de Minéralogie, volume 108, 3-4, 1985. Minéralogie dans les Sciences de la Terre et l'Industrie - Hommage à François Permingeat
Handwritten biographical information on Paulina T. McClung Merritt
No full textA handwritten biography of Paulina T. McClung Merritt by an unknown author, 1892.
Heterogeneous and tissue-specific regulation of effector T cell responses by IFN-gamma during Plasmodium berghei ANKA infection.
No full textIFN-γ and T cells are both required for the development of experimental cerebral malaria during Plasmodium berghei ANKA infection. Surprisingly, however, the role of IFN-γ in shaping the effector CD4(+) and CD8(+) T cell response during this infection has not been examined in detail. To address this, we have compared the effector T cell responses in wild-type and IFN-γ(-/-) mice during P. berghei ANKA infection. The expansion of splenic CD4(+) and CD8(+) T cells during P. berghei ANKA infection was unaffected by the absence of IFN-γ, but the contraction phase of the T cell response was significantly attenuated. Splenic T cell activation and effector function were essentially normal in IFN-γ(-/-) mice; however, the migration to, and accumulation of, effector CD4(+) and CD8(+) T cells in the lung, liver, and brain was altered in IFN-γ(-/-) mice. Interestingly, activation and accumulation of T cells in various nonlymphoid organs was differently affected by lack of IFN-γ, suggesting that IFN-γ influences T cell effector function to varying levels in different anatomical locations. Importantly, control of splenic T cell numbers during P. berghei ANKA infection depended on active IFN-γ-dependent environmental signals--leading to T cell apoptosis--rather than upon intrinsic alterations in T cell programming. To our knowledge, this is the first study to fully investigate the role of IFN-γ in modulating T cell function during P. berghei ANKA infection and reveals that IFN-γ is required for efficient contraction of the pool of activated T cells
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Pelevin’s Trinity in the novel “t”: author – protagonist – reader
No full textThe article attempts to interpret Pelevin's artistic strategy in the novel "T" by exploring its subject organization and addressing the key problems of the author, the protagonist, and the reader as they are seen by the researcher. The article analyzes the peculiarities of constructing the narrative reality in the novel "T", and goes on to discuss Pelevin's philosophic models of the development of the humankind, and the emergence of his new anthropology
Measuring industry-science links through inventor-author relations: A profiling method
No full textIn this pilot study we examine the performance of text-based profiling in recovering a set of validated inventor-author links. In a first step we match patents and publications solely based on their similarity in content. Next, we compare inventor and author names on the highest ranked matches for the occurrence of name matches. Finally, we compare these candidate matches with the names listed in a validated set of inventor-author names. Our text-based profile methodology performs significantly better than a random matching of patents and publications, suggesting that text-based profiling is a valuable complementary tool to the name searches used in previous studies.innovation; industry-science links; text-based profiling;
Wave turbulence of a rotating array of quantized vortices in the T → 0 temperature limit
No full textThe dynamics of quantized vortices in the zero temperature limit is currently of great interest, particularly in the case of the Fermi superfluid He-B. Here we study wave turbulence, generated by the librating motion of a rotating cylindrical container filled with He-B, in the limit of vanishing viscous forces at temperatures . The polarization of the quantized vortices with respect to the axis of rotation is measured using non-invasive NMR techniques. We observe a decrease of the polarization when the librating motion is started, and a two-stage relaxation process when the modulation of the rotation velocity is stopped. The first relaxation process is associated with the dissipation of large-scale flow stored in inertial waves and the solid body rotation of the vortex array. From the decay of these energy reservoirs we determine the rate of energy dissipation of large-scale flow. The later second process is related to the relaxation of Kelvin waves on individual vortices. This process is monitored by the recovery of the polarization. The existence of a Kelvin wave cascade at the lowest temperatures is currently a central open question. We supply some evidence for the cascade
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