100,366 research outputs found
Analytic subvarieties with many rational points
No full textWe give a generalization of the classical Bombieri–Schneider–Lang criterion in transcendence theory. We give a local notion of LG-germ, which is similar to the notion of E-function and Gevrey condition, and which generalize (and replace) the condition on derivatives in the theorem quoted above. Let KC be a number field and X a quasi-projective variety defined over K. Let γ : M → X be an holomorphic map of finite order from a parabolic Riemann surface to X such that the Zariski closure of the image of it is strictly bigger then one. Suppose that for every pX(K)(M) the formal germ of M near P is an LG-germ, then we prove that X(K)(M) is a finite set. Then we define the notion of conformally parabolic Kähler varieties; this generalize the notion of parabolic Riemann surface. We show that on these varieties we can define a value distribution theory. The complementary of a divisor on a compact Kähler manifold is conformally parabolic; in particular every quasi projective variety is. Suppose that A is conformally parabolic variety of dimension m over C with Kähler form ω and γ : A → X is an holomorphic map of finite order such that the Zariski closure of the image is strictly bigger then m. Suppose that for every pX(K)(A) , the image of A is an LG-germ. then we prove that there exists a current T on A of bidegree (1, 1) such that ATm−1 explicitly bounded and with Lelong number bigger or equal then one on each point in γ −1(X(K)). In particular if A is affine γ −1(X(K)) is not Zariski dense
Organization of the projections from the ventral tegmental area of Tsai to the hippocampal formation in the rat
No full textLetter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
Technological background of viscoelastic damping for space applications
No full textOne of the most important themes of the structural analysis is the vibration reduction. At present there are different devices which can be used to improve structural damping based on the use of active or passive dampers. Many studies on reduction and/or suppression of vibrations in LFSS and SFSS (Large/Small Flexible Space Structure) have been carried out in last decades. In this work a special smart structure will be proposed for the vibration suppression of composite panels. In particular the viscoelastic properties of a composite panel-structure will be changed opportunely in order to modify the elastic damping characteristics of the material which constitutes the panel. It is well known that these viscoelastic materials are characterized by the complex modulus. These moduli depend on two main parameters, the temperature T that material operates in and more interesting on the magnitude of the oscillating frequency ω the composite structure can be subjected at under a dynamic environment. In this study the determination of the complex modulus and the effect of above mentioned parameters on a composite panel for space applications are investigated. The sandwich panel here is made up of two carbon fibre skins and a polymeric core in analyzed. This core is constituted by an epoxy adhesive containing some silver conducting stripes opportunely distributed inside it. By applying a voltage to the ends of the silver stripes it is possible to produce a current which in turn generates heating, the epoxy resin and carbon skins, by Joule effect. The temperature acts on chemical bonds by increasing the molecular mobility and producing relaxation of the material which in turns varies the mechanical and thermal characteristics of the core and the resin matrix reducing the storage modulus, increasing the loss modulus and the loss factor. It's worth to note that this loss factor is directly related to the damping ratio of the panel. The viscoelastic parameters of the adhesive and of the carbon fibre will be experimentally estimated and evaluated using DMTA (Dynamic Mechanical and Thermal Analysis) Mathematical models and finite element simulations of this Heated Damping Sandwich Panel (HDSP) will be presented in order to study the coupling related to the thermal and structural interaction between the core, the skins and the silver electrical conductors. The stripe's cross section, the geometrical in-plane disposition and the electrical feeding will be found in order to have the minimum transitory time or the minimum necessary power for vibration suppression
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
Functional magnetic resonance imaging in the evaluation of the elastic properties of ascending aortic aneurysm
No full textObjective: To evaluate the aortic wall elasticity using the maximal rate of systolic distension (MRSD) and maximal rate of diastolic recoil (MRDR) and their correlation with the aortic size index (ASI). Methods: Forty-eight patients with thoracic aortic aneurysm were enrolled in this study. A standard magnetic resonance imaging (MRI) protocol was used to calculate MRSD and MRDR. Both MRSD and MRDR were expressed as percentile of maximal area/10-3 sec. ASI (maximal aortic diameter/body surface area) was calculated. A correlation between MRSD, MRDR, ASI, and the patient’s age was performed using regression plot. Results: A significant correlation between MRSD (t=-4,36; r2=0.29; P≤0.0001), MRDR (t=3.92; r2=0.25; P=0.0003), and ASI (25±4.33 mm/m2; range 15,48-35,14 mm/m2) is observed. As ASI increases, aortic MRSD and MRDR decrease. Such inverse correlation between MRSD, MRDR, and ASI indicates increased stiffness of the ascending aorta. A significant correlation between the patient’s age and the decrease in MRSD and MRDR is observed. Conclusion: MRSD and MRDR are significantly correlated with ASI and the patient’s age. They seem to describe properly the increasing stiffness of aortas. These two new indexes provide a promising, accessible, and reproducible approach to evaluate the
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;
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