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Search Results: 1 - 10 of 404737 matches for " M Nathan Nair "
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The baboon (Papio anubis) extracranial carotid artery: An anatomical guide for endovascular experimentation
J Mocco, Daniel J Hoh, M Nathan Nair, Tanvir F Choudhri, William J Mack, Ilya Laufer, E Sander Connolly
BMC Cardiovascular Disorders , 2001, DOI: 10.1186/1471-2261-1-4
Abstract: We characterized the extracranial carotid system often male baboons (Papio anubis, range 15.1–28.4 kg) by early post-mortem dissection. Photographic documentation of vessel lengths, lumen diameters, and angles of origin were measured for each segment of the carotid bilaterally.The common carotid arteries averaged 94.7 ± 1.7 mm (left) and 87.1 ± 1.6 mm (right) in length. The average minimal common carotid lumen diameters were 3.0 ± 0.3 mm (left) and 2.9 ± 0.2 mm (right). Each animal had a common brachiocephalic artery arising from the aorta which bifurcated into the left common carotid artery and right braciocephalic artery after 21.5 ± 1.6 mm. The vascular anatomy was found to be consistent among animals despite a wide range of animal weights.The consistency in the Papio anubis extracranial carotid system may promote the use of this species in the preclinical investigation of neuro-interventional therapies.There has been a recent interest in developing aggressive interventional strategies for the treatment of a variety of neurological diseases including stroke, subarachnoid hemorrhage, and head trauma [1-4]. Successful translation of these therapies to the clinical arena, however, is critically dependent on the use of appropriate experimental models [5]. Non-human primate models of neurological diseases currently exist and have the advantage of most closely mimicking human physiology [6]. These models are particularly relevant to neuro-interventional research in that anatomical similarities permit routine vascular access and evaluation of devices designed on a clinically relevant scale.Conducting experimental primate endovascular studies, however, requires a comprehensive understanding of the carotid vascular system. Previous investigations of non-human primate vascular anatomy have focused primarily on the general morphology of the vessels and not on vessel angles, lengths, or lumen diameters which are necessary for guiding endovascular technology [7,8]. To answer
Make it simple with the W1713 suture.
Nair M
Indian Journal of Ophthalmology , 2001,
Granular cell myoblastoma
Nair Laxmi,Binitha M
Indian Journal of Dermatology, Venereology and Leprology , 1990,
Abstract: A case of granular cell myoblastoma in a twenty four year old lady is reported.
Hybrid BDI-POMDP Framework for Multiagent Teaming
R. Nair,M. Tambe
Computer Science , 2011, DOI: 10.1613/jair.1549
Abstract: Many current large-scale multiagent team implementations can be characterized as following the belief-desire-intention (BDI) paradigm, with explicit representation of team plans. Despite their promise, current BDI team approaches lack tools for quantitative performance analysis under uncertainty. Distributed partially observable Markov decision problems (POMDPs) are well suited for such analysis, but the complexity of finding optimal policies in such models is highly intractable. The key contribution of this article is a hybrid BDI-POMDP approach, where BDI team plans are exploited to improve POMDP tractability and POMDP analysis improves BDI team plan performance. Concretely, we focus on role allocation, a fundamental problem in BDI teams: which agents to allocate to the different roles in the team. The article provides three key contributions. First, we describe a role allocation technique that takes into account future uncertainties in the domain; prior work in multiagent role allocation has failed to address such uncertainties. To that end, we introduce RMTDP (Role-based Markov Team Decision Problem), a new distributed POMDP model for analysis of role allocations. Our technique gains in tractability by significantly curtailing RMTDP policy search; in particular, BDI team plans provide incomplete RMTDP policies, and the RMTDP policy search fills the gaps in such incomplete policies by searching for the best role allocation. Our second key contribution is a novel decomposition technique to further improve RMTDP policy search efficiency. Even though limited to searching role allocations, there are still combinatorially many role allocations, and evaluating each in RMTDP to identify the best is extremely difficult. Our decomposition technique exploits the structure in the BDI team plans to significantly prune the search space of role allocations. Our third key contribution is a significantly faster policy evaluation algorithm suited for our BDI-POMDP hybrid approach. Finally, we also present experimental results from two domains: mission rehearsal simulation and RoboCupRescue disaster rescue simulation.
Water Molecules in the Carbon C60 Confined Space  [PDF]
M. Baskar, N. Sathyan, T. R. Gopalakrishnan Nair
Journal of Biophysical Chemistry (JBPC) , 2018, DOI: 10.4236/jbpc.2018.92002
Abstract: Experimental scenario of the world being successful in planting water molecule at binary level in fullerene C70 is of utmost importance to pursue the theoretical properties of predictive triple water molecules and poly water molecules in Vander Waals confined space like fullerenes. Here, we present a paper in these lines of exploration of embedding triple water molecules in a Carbon confined space through the studies of behavior of three water molecules in Fullerene C60 by ab-initio methods. This heterogeneous system manifests cyclic hydrogen bonds which may be working with flipping actions. The unusual structural property of water trimers is reported. There exists a dipole moment of 0.9 ± 0.1 Debye which indicates the probable semiconductor properties.
A diagnosis of conflict: theoretical barriers to integration in mental health services & their philosophical undercurrents
Nathan M Gerard
Philosophy, Ethics, and Humanities in Medicine , 2010, DOI: 10.1186/1747-5341-5-4
Abstract: In the UK there has been much talk of "integrating" mental health services in recent years--a topic usually couched within a broader government agenda of assimilating health and social care. Parallel movements towards service integration can be found in North America [1] and throughout the developed and developing world [2]. In the UK, pathways towards integration have been paved by the Health Act Flexibilities (1999), which removed financial and legal constraints hindering service integration, and the Health and Social Care Act (2001), which created Care Trusts aimed to deliver a whole spectrum of services within a single organization.The topic of service integration gains much of its appeal by appearing to make sense virtually "across the board," from the politicians and commissioners focused on partnerships and integrated budgets, to the practitioners focused on integrated working and service delivery, right down to the service user accessing a more convenient and reliable set of services provided by a "team" of professionals. Indeed, service integration has repeatedly been promoted in this sweeping manner [3-5].Those in the midst of such integration, however, realize that it carries a number of conflicts, many of which are hardly new. One longstanding conflict poised to come to the fore by recent integration measures lies within divergent theoretical orientations towards the phenomena being treated. By "theoretical orientations" I wish to connote those views generally held among practitioners, either as a result of educational training or area of work (or both). Nowhere is this arguably more prevalent than in the formation of "community mental health teams" (CMHTs)--a hallmark of service integration over the past decade--whereby diversely trained practitioners are placed under one roof and, ideally, in regular contact with each other to exchange ideas and skills. As promising as this multidisciplinary, team-based approach may seem, the reality within such teams
Real Compton Scattering at High Transverse Momentum Transfer
Alan M. Nathan
Physics , 1998,
Abstract: We discuss the physics motivation for a program of Real Compton Scattering on the proton in the regime where both the incident energy and the transverse momentum transfer are large. It is shown that such a program can test which of the various hard scattering mechanisms is dominant and can allow a measurement of a new generalized form factor that is sensitive to both the flavor and spin structure of the proton. It is further shown that the measurements are experimentally feasible using existing or already planned equipment up to incident energies of 12 GeV.
Real Compton Scattering from the Proton
Alan M. Nathan
Physics , 1999,
Abstract: Real Compton Scattering on the proton in the hard scattering regime is investigated. Recent theoretical developments are reviewed. Plans for new experimental studies at Jefferson Laboratory are presented.
A knot without a nonorientable essential spanning surface
Nathan M. Dunfield
Mathematics , 2015,
Abstract: This note gives the first example of a hyperbolic knot in the 3-sphere that lacks a nonorientable essential spanning surface; this disproves the Strong Neuwirth Conjecture formulated by Ozawa and Rubinstein. Moreover, this knot has no even strict boundary slopes, disproving the Even Boundary Slope Conjecture of the same authors. The proof is a rigorous calculation using Thurston's spun-normal surfaces in the spirit of Haken's original normal surface algorithms.
A table of boundary slopes of Montesinos knots
Nathan M. Dunfield
Mathematics , 1999,
Abstract: This note corrects errors in Hatcher and Oertel's table of boundary slopes of Montesinos knots which have projections with 10 or fewer crossings.
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