Waves as the source of apparent twisting motions in sunspot penumbrae

The motion of dark striations across bright filaments in a sunspot penumbra has become an important new diagnostic of convective gas flows in penumbral filaments. The nature of these striations has, however, remained unclear. Here we present an analysis of small scale motions in penumbral filaments in both simulations and observations. The simulations, when viewed from above, show fine structure with dark lanes running outwards from the dark core of the penumbral filaments. The dark lanes either occur preferentially on one side or alternate between both sides of the filament. We identify this fine structure with transverse (kink) oscillations of the filament, corresponding to a sideways swaying of the filament. These oscillations have periods in the range of 5-7 min and propagate outward and downward along the filament. Similar features are found in observed G-band intensity time series of penumbral filaments in a sunspot located near disk center obtained by the Broadband Filter Imager (BFI) on board {\it Hinode}. We also find that some filaments show dark striations moving to both sides of the filaments. Based on the agreement between simulations and observations we conclude that the motions of these striations are caused by transverse oscillations of the underlying bright filaments.Comment: Accepted for publication in Astrophysical Journal on 8th April 201

Primary Amoebic (Naegleria fowleri) Meningoencephalitis Presenting as Status Epilepticus

Primary amebic meningoencephalitis (PAM) is a rare entity. Usual presenting features are fever, headache and seizures with meningeal signs and this disease carries high mortality rate. We present a case report of PAM presenting as status epilepticus

Batch Arrival Queuing Models with Periodic Review

In this paper, we propose a periodic review policy for the M/M /c type of queue The embedded Markov chain technique is used for the analysis of this system. To determine the mean queue length of mean job waiting times and higher moments of these quantities the probability generating functions are calculated (for the queue length) A comparison is made between constant and state dependent lengths of the review period

Application of Groups to Word Problems

Using Combinatorial Group Theory an area of mathematics arising from Abstract Algebra, the so called Word Problems can be effectively understood. With the objective of finding applications of the elements of fundamental groups, an attempt has been made in this paper to discuss the word problem in the form of finding the generators in the English Alphabets. These ideas can be widely used in Cryptography, the science of secret codes

Connell Sequences

In this paper we have discussed an interesting type of sequence called “Connell Sequence”. The main part of the paper lies in deriving the generating function for the Connell Sequence and its limiting behavior is discussed. We have extended the definition of Connell Sequence and have studied the “General Connell Sequences” and have studied its generating function and its limiting behavior. The connection between Connell Sequences and the Polygonal Numbers are also explored in the process of finding the Generating Functions of these Sequences

Fractal Sequences

In this paper we shall explore the various ways and properties of fractal sequences. I have given three types of fractal sequences totally in different aspects. The first type is a sequence generated by card shuffling and the second type is the Golden Sequence and the third type is the Signature sequences. The method of their generation is given for each case. Through these types one can explore the beauty and can enjoy with the properties of these amazing sequences

Randomized Encryption Cryptosystem

Cryptography is the art of secret writing. There are essentially two types of cryptosystems. (i) Secret-key cryptosystems also called symmetric cryptosystems (ii) Public-key cryptosystems also called asymmetric cryptosystems. In this paper, we shall consider a Public-key cryptosystem whose security is based on the infeasibility of the Quadratic Residuosity Problem (QRP

A Study on the Effect of Enterprise Resource Planning (ERP) on People of an Organization

The ultimate objective of any organizational initiative to install ERP system is to reveal some advantage, whether it is associated with cost savings, improved efficiencies, or better decision-making. These systems can in the long run save millions of dollars, improve quality of information, and increase workers’ productivity by reducing the amount of time to do a job. ERP systems can virtually eliminate the redundancies that occur from outdated and disparate systems that may be present in each department of an organization. This paper highlights the effect of ERP systems on the people of an organization. The results indicated that employees, customers and suppliers were benefitted due to installation of ERP systems while external agencies were not affected due to ERP systems