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Large Impacts around a Solar Analog Star in the Era of Terrestrial Planet Formation
Huan Y. A. Meng,Kate Y. L. Su,George H. Rieke,David J. Stevenson,Peter Plavchan,Wiphu Rujopakarn,Carey M. Lisse,Saran Poshyachinda,Daniel E. Reichart
Physics , 2015, DOI: 10.1126/science.1255153
Abstract: The final assembly of terrestrial planets occurs via massive collisions, which can launch copious clouds of dust that are warmed by the star and glow in the infrared. We report the real-time detection of a debris-producing impact in the terrestrial planet zone around a 35-million year-old solar analog star. We observed a substantial brightening of the debris disk at 3-5 {\mu}m, followed by a decay over a year, with quasi-periodic modulations of the disk flux. The behavior is consistent with the occurrence of a violent impact that produced vapor out of which a thick cloud of silicate spherules condensed that were ground into dust by collisions. These results demonstrate how the time domain can become a new dimension for the study of terrestrial planet formation.
Planetary Collisions outside the Solar System: Time Domain Characterization of Extreme Debris Disks
Huan Y. A. Meng,Kate Y. L. Su,George H. Rieke,Wiphu Rujopakarn,Gordon Myers,Michael Cook,Emery Erdelyi,Chris Maloney,James McMath,Gerald Persha,Saran Poshyachinda,Daniel E. Reichart
Physics , 2015, DOI: 10.1088/0004-637X/805/1/77
Abstract: Luminous debris disks of warm dust in the terrestrial planet zones around solar-like stars are recently found to vary, indicative of ongoing large-scale collisions of rocky objects. We use Spitzer 3.6 and 4.5 {\mu}m time-series observations in 2012 and 2013 (extended to 2014 in one case) to monitor 5 more debris disks with unusually high fractional luminosities ("extreme debris disk"), including P1121 in the open cluster M47 (80 Myr), HD 15407A in the AB Dor moving group (80 Myr), HD 23514 in the Pleiades (120 Myr), HD 145263 in the Upper Sco Association (10 Myr), and the field star BD+20 307 (>1 Gyr). Together with the published results for ID8 in NGC 2547 (35 Myr), this makes the first systematic time-domain investigation of planetary impacts outside the solar system. Significant variations with timescales shorter than a year are detected in five out of the six extreme debris disks we have monitored. However, different systems show diverse sets of characteristics in the time domain, including long-term decay or growth, disk temperature variations, and possible periodicity.
Evaluation of Anterior Cruciate Ligament repair with Iliotibial Band
Rajat Saran
People's Journal of Scientific Research , 2010,
Abstract: Reconstruction of the anterior cruciate ligament (ACL) is the surgical treatment of choice as direct primary repair of the ligament has been shown to result in persistent laxity and instability of the knee. The aim of reconstruction is to restore stability of the knee without restricting its functions. Anterior cruciate ligament reconstruction requires a graft which may be either an autograft or an allograft or a synthetic graft.Most studies agree that using the patient’s own tissue (autograft) to repair an anterior cruciate ligament tear is the way to go. Graft taken from patellar tendon gives good results but muscle weakness, pain, tendonitis and kneecap fracture are just a few of the possible post-operative problems. In this prospective study of ACL reconstruction, tendon material from iliotibial tract was used in a special way for adding stability to the knee called iliotibial band tenodesis. Herein, 17 cases of ACL repair and augmantation with iliotibial tract is being evaluated.
Wellposedness of Mean Field Games with Common Noise Under a Weak Monotonicity Condition
Saran Ahuja
Mathematics , 2014,
Abstract: In this paper, we consider Mean Field Games in the presence of common noise relaxing the usual independence assumption of individual random noise. We assume a simple linear model with terminal cost satisfying a convexity and a weak monotonicity property. Our main result is showing existence and uniqueness of a Mean Field Game solution using the Stochastic Maximum Principle. The uniqueness is a result of a monotonicity property similar to that of Lasry and Lions. We use the Banach Fixed Point Theorem to establish an existence over small time duration and show that it can be extended over an arbitrary finite time duration.
Enhancement of Wind Energy Conversion Using Axial Flux Generator  [PDF]
Ibrahim Al-Bahadly, Saran Chowdary Neppalli
Journal of Power and Energy Engineering (JPEE) , 2019, DOI: 10.4236/jpee.2019.72004
Abstract: This paper investigates the application of the axial flux machine (AFM) to the wind energy conversion systems (WECS) to obtain high power and torque at reduced cost. By developing mathematical equations using the phase and active transformations, the three-phase model is transformed to two-phase equations by making both the stator and rotor as reference frames, finally converting to arbitrary reference frame, which is useful for the modelling of the axial flux machine. The torque, current, and voltage equations are expressed to improve the simulation reliability. Based on the developed equations, the mathematical model for the axial flux machine is developed using the MATLAB/Simulink. Starting with the axial flux motor model, when the load on the motor increases, how the parameters like torque, current, and speed of the motor vary are explored in this paper. Then for the axial flux generator model, when the wind speed exceeds the rated speed how the torque, line voltages, currents, power and speed of the generator behave are investigated and presented in this paper. The developed model in this paper could be extended to a twin-rotor axial flux synchronous machine, which will lead to the development of more efficient WECS.
The Ramayana kakawin; A product of Sanskrit scholarship and independent literary genius
Vinod Khanna,Malini Saran
Bijdragen tot de Taal-, Land- en Volkenkunde , 1993,
Combinatorial approach to M/M/1 queues using hypergeometric functions
J. Saran,K. Nain
International Mathematical Forum , 2013,
Abstract: In this paper we use a well known reflection principle for lattice path countingto apply for the analysis of the M/M/1 queuing system. The joint distribution of iarrivals and j departures over a time interval of length t is obtained, when there are kcustomers in the beginning of the system. The derivation uses the lattice pathapproach between two points, in two dimensional x-y plane with certain restrictions.Finally a known result of queue length is verified from Satty (1961).
Fine needle aspiration cytology of fibrolamellar hepatocellular carcinoma: Recognizing the oncocytic hepatocyte
Gulati Geetika,Saran Ravindra
Indian Journal of Pathology and Microbiology , 2009,
TraumaTutor: Perceptions of a Smartphone Application as a Learning Resource for Trauma Management
James Wigley,Saran Shantikumar
Journal of Biomedical Education , 2013, DOI: 10.1155/2013/149162
Abstract: Aim. We investigated perceptions of a new smartphone application (app) as a learning resource. Methods. We developed TraumaTutor, an iPhone app consisting of 150 questions and explanatory answers on trauma management. This was used by 20 hospital staff that either had a special interest in managing trauma or who were studying for relevant exams, such as ATLS. A subsequent questionnaire assessed users’ experience of smartphone applications and their perceptions of TraumaTutor. Results. Of those surveyed, 85% had a device capable of running app software, and 94% of them had used apps for medical education. Specific to TraumaTutor, 85% agreed that it was pitched at the right level, 95% felt that the explanations improved understanding of trauma management, and 100% found the app easy to use. In fact, on open questioning, the clear user interface and the quality of the educational material were seen as the major advantages of TraumaTutor, and 85% agreed that the app would be a useful learning resource. Conclusions. Smartphone applications are considered a valuable educational adjunct and are commonly used by our target audience. TraumaTutor shows overwhelming promise as a learning supplement due to its immediacy, accessibility, and relevance to those preparing for courses and managing trauma. 1. Introduction Since the smartphone was unveiled in 2000 [1, 2], and in particular the iPhone in 2007, its uses and adaptability have been an unbridled success story with over 40 billion applications (apps) being downloaded worldwide by 2013 [3]. Educational apps are becoming increasingly commonplace with more people turning to the online marketplace to gather and consolidate information. We developed TraumaTutor, an app created with the intention of improving the understanding of trauma in the acute setting amongst hospital staff. The program consists of 150 single best answer questions and detailed explanatory answers of trauma management. Based on the widely adopted syllabus of the Advanced Trauma Life Support course, TraumaTutor encompasses the fundamental principles of trauma management, with chapters dedicated to individual aspects of the primary survey as well as the specialist management of trauma in children, pregnancy, and the elderly. We investigated the perceptions of TraumaTutor as a learning resource amongst its intended target audience. 2. Methods Twenty hospital staff of varying grades who had a special interest in trauma (emergency department specialist nurses, junior doctors, and consultants in emergency medicine and surgery) were asked to use
CFTs in rotating black hole backgrounds
Pau Figueras,Saran Tunyasuvunakool
Physics , 2013, DOI: 10.1088/0264-9381/30/12/125015
Abstract: We use AdS/CFT to construct the gravitational dual of a 5D CFT in the background of a non-extremal rotating black hole. Our boundary conditions are such that the vacuum state of the dual CFT corresponds to the Unruh state. We extract the expectation value of the stress tensor of the dual CFT using holographic renormalisation and show that it is stationary and regular on both the future and the past event horizons. The energy density of the CFT is found to be negative everywhere in our domain and we argue that this can be understood as a vacuum polarisation effect. We construct the solutions by numerically solving the elliptic Einstein--DeTurck equation for stationary Lorentzian spacetimes with Killing horizons.
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