MODELLING AND ANALYSIS OF AN IRREGULAR RAILWAY TRACK SYSTEM FOR COMPUTATION OF CRITICAL VELOCITY FOR LIMITING VERTICAL ACCELERATION

The irregularity in the railway tracks is a very common topic of interest among the researchers in recent times. The trains run on the tracks with very high velocities to meet the demands of the passengers. But due to the unevenness of the track, the body of the train car faces vertical accelerations, which in turn causes discomfort to the passengers sitting inside the train car. In the present report, vertical acceleration is analyzed for uneven tracks by taking the car body as a single degree of freedom model. The investigation shows a clear explanation of the critical velocity values for the train, so as to maintain the passenger comfort conditions. Random sinusoidal curves were generated using MATLAB to analyze the random unevenness of the track. It is observed that the vertical accelerations in the car body are directly proportional to the speed of the train. Finally, a critical velocity is proposed for a train running on uneven sinusoidal profile track such that, the vertical acceleration not exceeding 0.2g

MODELLING AND ANALYSIS OF AN IRREGULAR RAILWAY TRACK SYSTEM FOR COMPUTATION OF CRITICAL VELOCITY FOR LIMITING VERTICAL ACCELERATION

The irregularity in the railway tracks is a very common topic of interest among the researchers in recent times. The trains run on the tracks with very high velocities to meet the demands of the passengers. But due to the unevenness of the track, the body of the train car faces vertical accelerations, which in turn causes discomfort to the passengers sitting inside the train car. In the present report, vertical acceleration is analyzed for uneven tracks by taking the car body as a single degree of freedom model. The investigation shows a clear explanation of the critical velocity values for the train, so as to maintain the passenger comfort conditions. Random sinusoidal curves were generated using MATLAB to analyze the random unevenness of the track. It is observed that the vertical accelerations in the car body are directly proportional to the speed of the train. Finally, a critical velocity is proposed for a train running on uneven sinusoidal profile track such that, the vertical acceleration not exceeding 0.2g

Primary primitive neuroectodermal tumor of the orbit

Primitive neuroectodermal tumor (PNET) is a small round cell malignant tumor of neuroectodermal origin. Most of the PNETs occur in the central nervous system (CNS). PNETs recognized outside of CNS are diagnosed as peripheral PNET (pPNET). This tumor which expresses MIC-2 gene (CD99) seems to be least aggressive after complete tumor resection. We describe a rare case of PNET in a young girl

Solitary fibrous tumor of the orbit presenting in pregnancy

A 32-year-old woman, three months pregnant, reported with the complaint of protrusion of the right eye for six months. She gave history of rapid protrusion of eyeball for the last two months along with the history of double vision for the last one month. Computer tomography (CT) scan revealed a well-defined mass lesion in the intraconal space of the right orbit which was excised through a lateral orbitotomy approach. Histological examination and immunohistochemistry revealed a solitary fibrous tumor, which showed a rapid progression in pregnancy

Ocular adnexal lymphoma in the Northeast Indian population

We present the clinical profile of biopsy and immunohistochemistry-proven ocular adnexal lymphomas in the Northeast Indian population. Nineteen patients between October 2004 and June 2006 with ocular adnexal lymphoma were analyzed retrospectively. Histopathological classification was done according to international working formulation. Twelve patients were male and seven were female. All were diagnosed as non-Hodgkin′s lymphoma and the majority were B cell type (89%). Most of the cases (42%)were treated with radiotherapy followed by chemotherapy

Urinary tract infection, its causative microorganism and antibiotic susceptibility in Nagaland

Aim: We studied the causative microorganisms and antibiotic susceptibility of urinary tract infections (UTI) for both male and female in Nagaland, North-Eastern India. Materials and Methods: This is a retrospective study done at Christian Institute of Health Sciences and Research, Dimapur, where urinary samples received for culture and sensitivity in the laboratory from January 2012 to June 2013 were included. Organisms were identified by doing standard culture method, and antibiotic sensitivity was done by Kirby-Bauer Disc diffusion method from mid-stream clean catch urine sample. Results: A total of 1789 samples were analyzed in this study, where 502 (28.1%) showed significant growth, 330 (18.4%) showed insignificant growth, and the rest 957 (53.5%) showed no growth. The most commonly isolated bacterium was Escherichia coli both in an outpatient department (31%) and in-patient department (38%) patients followed by Klebsiella pneumonia, Pseudomonas sp., Enterococcus, Staphylococcus aureus, Candida, and Proteus. Analysis of the samples showed that UTI was more common in females (60%) as compared to males (40%). It was also observed that the samples responded effectively to chloramphenicol (29%), gentamicin (28%), imipenem (26%), and amikacin (21%). High degree of resistance was shown for nalidixic acid, ciprofloxacin, norfloxacin, amoxyclav, and ofloxacin. Conclusion: Antibiotics have been in use for a long period and more often the misuse of antimicrobial drugs has today led to a general rise in the emergence of resistant bacteria. This study may aid health professionals in choosing the appropriate treatment for patients in North-Eastern India

Ocular adnexal lymphoma in the Northeast Indian population

We present the clinical profile of biopsy and immunohistochemistry-proven ocular adnexal lymphomas in the Northeast Indian population. Nineteen patients between October 2004 and June 2006 with ocular adnexal lymphoma were analyzed retrospectively. Histopathological classification was done according to international working formulation. Twelve patients were male and seven were female. All were diagnosed as non-Hodgkin′s lymphoma and the majority were B cell type (89%). Most of the cases (42%)were treated with radiotherapy followed by chemotherapy

Pattern of uveitis in North East India: A tertiary eye care center study

We conducted an institutional-based retrospective study on 308 uveitic patients and analyzed the pattern of uveitis in Northeastern India. Anterior uveitis was the most common type (47.07%) followed by posterior (29.87%), intermediate (12.98%) and panuveitis (10.06%). Toxoplasmosis (40.21%) had the highest incidence among posterior uveitis cases. Harada′s form of Vogt Koyanagi Harada′s disease is a frequent occurrence in this subset of the population