104,453 research outputs found
Proteins at charged interfaces
No full textThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1993.Includes bibliographical references (p. 288-293).by Ganesh Venkataraman.Ph.D
A far-field based T-matrix method for two dimensional obstacle scattering
Get PDFThe infinite T-matrix completely describes the acoustic scattering properties of an obstacle. The T-matrix is extremely important for many applications because it is computationally cheap to use the T-matrix to simulate scattering for many different orientations of the obstacle or incident waves. The T-matrix is usually computed using the null field method. However, the null field method is often numerically unstable for acoustically large obstacles or for obstacles with large aspect ratios. We describe an efficient and stable method for computing the T-matrix for sound-soft, sound-hard, absorbing, and dielectric scattering, using numerical far field values obtained using any method. We demonstrate the algorithm by generalizing the recently proposed fundamental solution and non-polynomial finite element methods for the far field and T-matrix computations.
References A. H. Barnett and T. Betcke. An exponentially convergent nonpolynomial finite element method for time-harmonic scattering from polygons. SIAM J. Sci. Comput., 2010, to appear. http://www.personal.reading.ac.uk/ sp900945/papers/BaBe09.pdf. D. Colton and R. Kress. Inverse Acoustic and Electromagnetic Scattering Theory. Springer, 1998. A. Doicu, T. Wriedt, and Y. Eremin. Light Scattering by Systems of Particles. Null-Field Method with Discrete Sources---Theory and Programs. Springer Verlag, 2006. M. Ganesh and S. C. Hawkins. A far-field based T-matrix method for three dimensional acoustic scattering. ANZIAM J., 50:C121--C136, 2008. http://anziamj.austms.org.au/ojs/index.php/ANZIAMJ/article/view/1441 M. Ganesh and S. C. Hawkins. Three dimensional electromagnetic scattering T-matrix computations. J. Comput. Appl. Math., 2010. doi:10.1016/j.cam.2009.08.018. P. A. Martin. Multiple Scattering: Interaction of Time-Harmonic Waves with N Obstacles. Cambridge University Press, 2006. M. I. Mishchenko, L. D. Travis, and A. A. Lacis. Multiple Scattering of Light by Particles: Radiative Transfer and Coherent Backscattering. Cambridge University Press, 2006. P.C. Waterman. Matrix formulation of electromagnetic scattering. Proc. IEEE, 53:805--812, 1965
Letter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
Anuran assemblage and its trophic relations in rice-paddy fields of South India
No full textSeshadri, K. S., Allwin, Jesudasan, Seena, N. K., Ganesh, T. (2021): Anuran assemblage and its trophic relations in rice-paddy fields of South India. Journal of Natural History 54 (41-42): 2745-2762, DOI: 10.1080/00222933.2020.1867772, URL: http://dx.doi.org/10.1080/00222933.2020.186777
“Canopy-Less” Monitoring of Biodiversity and Climate Change: Signs of a Leaky Roof
No full textForest canopies are considered the last biotic frontier, and studies of canopy biota and related processes are just beginning to emerge in some parts of the world. Monitoring changes in biodiversity and related processes have gained much significance in the few last decades, particularly due to climate change. In addition, changes in biodiversity have been addressed by incorporating monitoring at various spatial and temporal scales that range from landscape-level changes, ecosystem dynamics, to population and species-level processes over extended time scales
The development of a laparoscopic colorectal service by a new consultant in a tertiary referral unit
No full textHandwritten 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.
Get PDFIFN-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
Get PDFWe 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
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