A Resistive Wideband Space Beam Splitter

We present the design, construction and measurements of the electromagnetic performance of a wideband space beam splitter. The beam splitter is designed to power divide the incident radiation into reflected and transmitted components for interferometer measurement of spectral features in the mean cosmic radio background. Analysis of a 2-element interferometer configuration with a vertical beam splitter between a pair of antennas leads to the requirement that the beam splitter be a resistive sheet with sheet resistance {\eta}o /2, where {\eta}o is the impedance of free space. The transmission and reflection properties of such a sheet is computed for normal and oblique incidences and for orthogonal polarizations of the incident electric field. We have constructed such an electromagnetic beam splitter as a square soldered grid of resistors of value 180 Ohms (approximately {\eta}o /2) and a grid size of 0.1 m, and present measurements of the reflection and transmission coefficients over a wide frequency range between 50 and 250 MHz in which the wavelength well exceeds the mesh size. Our measurements of the coefficients for voltage transmission and reflection agree to within 5% with physical optics modeling of the wave propagation, which takes into account edge diffraction.Comment: 14 pages,17 figure

Study Of Statistical Models For Route Prediction Algorithms In VANET

Vehicle-to-vehicle communication is a concept greatly studied during the past years. Vehicles equipped with devices capable of short-range wireless connectivity can form a particular mobile ad-hoc network, called a Vehicular Ad-hoc NETwork (or VANET). The users of a VANET, drivers or passengers, can be provided with useful information and with a wide range of interesting services. Route prediction is the missing piece in several proposed ideas for intelligent vehicles. In this paper, we are studying the algorithms that predict a vehicle's entire route as it is driven. Such predictions are useful for giving the driver warnings about upcoming traffic hazards or information about upcoming points of interest, including advertising. This paper describes the route Prediction algorithms using Markov Model, Hidden Markov Model (HMM), Variable order Markov model (VMM). Keywords: VANET, MANET, ITs, GPS, HMM, VMM, PST

Role of transvaginal sonography and hysteroscopy in abnormal uterine bleeding: does the diagnostic yield increase by combining transvaginal sonography, hysteroscopy and biopsy?

Background: Abnormal uterine bleeding is the most common complaint of perimenopausal and postmenopausal women. The aim of this study was 1) To evaluate the causes of abnormal uterine bleeding using transvaginal sonography, hysteroscopy and endometrial curettage to achieve the greatest diagnostic accuracy. 2) To determine the sensitivity and specificity of TVS and hysteroscopy in the detection of various uterine pathologies.Methods: This was a descriptive cross sectional study between January 2013 to June2014 in Sri Manakula Vinayagar medical college and hospital. After obtaining ethics committee approval, 100 consecutive patients with abnormal uterine bleeding between the age group of 35 and 55 years, who consented to participate in the study, were subjected to transvaginal sonography followed by diagnostic hysteroscopy combined with a directed biopsy. TVS and hysteroscopy was performed by two different investigators. The endometrial curettings and any intracavitary lesion were subjected to histopathological examination. Results tabulated and analysed using MS EXCEL and cross tabulation using Epi-info. Sensitivity, specificity, PPV, NPV for each pathology by TVS and hysteroscopy with HPE as the gold standard was calculated. Also the pathology causing abnormal uterine bleeding was computed by taking into account the endometrial characteristics and the associated lesions diagnosed by TVS, hysteroscopy and histopathological examination report.Results: 61 patients had only single lesions in the form of normal endometrium, atrophic endometrium, endometrial hyperplasia, endometrial polyp, malignancy and IU synechiae whereas 39 patients had lesions like intramural fibroids, adenomyosis, submucus myoma and polyps associated with different types of endometrium. The diagnostic accuracy of TVS and hysteroscopy were comparable for normal endometrium whereas hysteroscopy was found to be more accurate for endometrial polyps, endometrial hyperplasia and atrophic endometrium.Conclusions: The combination of transvaginal sonography, hysteroscopy and directed biopsy was found to increase the diagnostic yield in patients with abnormal uterine bleeding. As the diagnostic accuracy increased by combining the three modalities, an effective and appropriate management can be planned.

A study to assess efficacy of lower dose ketamine in labor analgesia and its effect on maternal and perinatal outcome

Background: Present study is planned to study the effectiveness of lower dose ketamine in labor analgesia and its effect on progression of labor, maternal and perinatal outcome.Methods: After obtaining ethical approval from institutional ethical committee, a prospective randomized interventional case control study was conducted in Department of obstetrics and gynecology, N.S.C.B medical college, Jabalpur. Parturient in active labor without risk factors were given 0.2 mg/kg intravenous ketamine in bolus form and 0.1 mg/kg in maintenance dose at 30 minutes interval till full dilatation and the results were analyzed using VAS scale and WHO partogram.Results: In present study, 280 parturient were included in the study. In 140 cases, induction-delivery interval was shortened in 47.10% cases. Pain relief was satisfactory (VAS 2-8) in 77.90% cases. However, 80.70% cases had transient light headedness. Overall satisfaction was significantly high in the intervention group (P<0.001).Conclusions: A lower dose ketamine in bolus form with loading dose of 0.2 mg/kg followed by maintenance dose of 0.1 mg/kg could provide safe and acceptable analgesia during labor and delivery

Knowledge, attitude and practices of pregnant women regarding anemia, iron rich diet and iron supplement

Background: Anemia in pregnancy has detrimental effects on maternal and child health and prevalence of anemia during pregnancy is alarmingly high, inspite of the implementation of  the national nutritional anemia prophylaxis programme which provides iron and folic acid which are the essential nutrients lacking in  their diet. The purpose of this study was to assess the knowledge, attitude and practices of pregnant women regarding anemia, Iron rich food and iron supplements and also to assess the impact of these factors and other socio demographic variables on the hemoglobin levels of these vulnerable groups of women.Methods: This is a cross sectional, descriptive institution based study conducted at Sri Manakula Vinayagar medical college hospital, Puducherry, India. Sample size was calculated using formula for single proportion with 5% marginal error and 95% CI and a non-response rate of 10% and was found to be 316. Data collection was carried out using a predesigned, self-administered questionnaire in local language in the antenatal clinic at the time of routine antenatal checkup, from pregnant women who consented to participate in the study. At the same sitting, 1 ml of blood was collected for hemoglobin estimation, analyzed and the result was recorded and disclosed to the patient. The data was entered in SPSS and analyzed using descriptive and inferential statistics (Chi square test).  A p value of <0.05 was considered to be statistically significant.Results: Assessment of knowledge revealed that only 39.87% of the participants were aware of and understood the term anemia. 53.8% of the participants accepted that pregnant women were more vulnerable to anemia and 66.1% responded correctly that the fetus will be affected by severe anemia. Only 32.6% gave the correct response that pregnant women should take iron supplementation in spite of taking a healthy diet. Only 44.62% of the participants were aware of their hemoglobin level in the current pregnancy. Knowledge about food rich in iron was poor among the participants. At least 1/5th of the participants have not received educational information regarding anemia from     any source. The overall attitude towards antenatal checkup, healthy diet and the benefits of iron supplementation was generally good among the participants 49.36% of the participants were taking only the usual diet during their pregnancy. 74.36% claimed to have taken iron supplementation regularly whereas 9.8% had not taken iron supplementation. On hemoglobin estimation it was found that 62.97% of the participants were anemic taking 11 grams as the cut off for anemia.  The only significant determinants of hemoglobin levels were regular intake of iron supplements   (p value   0.006) and timing of iron consumption (p value 0.0262).Conclusions: The present study indicated the lack of knowledge regarding anemia, iron rich foods and the importance of iron supplementation during pregnancy. Targeted estimation of hemoglobin levels in adolescent girls and women in reproductive age group, intensive counseling and motivation of pregnant women to consume Iron and folic acid and ensuring adequate supply to them, intensive de-worming, provision of toilet facilities to all households would help in reducing the incidence of anemia in pregnant women

Thyroid disorders in women with abnormal uterine bleeding: a tertiary hospital based cross sectional study from Puducherry, India

Background: The most common complaint with which women present for gynecological consultation is abnormal uterine bleeding which may be due to varied etiology. Among non-structural causes for AUB, endocrinological disorders like thyroid dysfunction is very common. Thyroid dysfunction is often overlooked, and unnecessary hormonal or surgical interventions are performed in patients with AUB.Methods: This is a hospital based cross sectional study carried out in Sri Manakula Vinayagar Medical College and Hospital, Puducherry between January 2017 to June 2017 for a period of 6 months and the participants were 200 women attending gynecological OPD with complaints of abnormal uterine bleeding. After obtaining a written informed consent from the participants a detailed history and complete examination including a thorough gynecological examination was performed. A transvaginal ultrasound examination to note for any structural causes for AUB was performed. Thyroid function test (FT3, FT4, TSH) was performed in all study participants and they were then categorized into euthyroid, hypothyroid, hyperthyroid, subclinical hypo or hyperthyroid based on the results. After preliminary preparation all participants were subjected for an endometrial biopsy in the outpatient department and the tissue obtained was sent for histopathological analysis. All the information was tabulated and analyzed using SPSS 22 version with descriptive and inferential statistics (chi square test). A p value of < 0.05 was considered as statistically significant.Results: Heavy menstrual bleeding was the most common menstrual abnormality found in 85% of the study participants.77% had structural causes for AUB whereas 23% had non-structural causes. 79.5% of the patients with AUB were euthyroid whereas 20.5% had some form of thyroid dysfunction. Subclinical hypothyroidism was the most common thyroid dysfunction (15.5%) in this study followed by hypothyroidism (3.5%). Only 1.5% of patients had hyperthyroidism. In the present study no, significant association was found between any particular thyroid dysfunction and specific menstrual pattern or endometrial pattern in histopathology.Conclusions: Testing and treating for thyroid disorder would prove to be cost effective in patients with AUB particularly with nonstructural causes as it would avoid many costly interventions done for AUB

Emulated Control System for a Nuclear Reactor

This paper discusses some of the instrumentation aspects of process control system developed for a nuclear power plant. Monitoring and controlling are the essential elements in the normal, abnormal and emergency operation of nuclear power plant. Through their sensors and transmitters, control systems measure process variables and inturn to control valves, motors and other electromechanical equipments of the nuclear plant. In this context, we have developed a Labview based such control system aimed at developing a real time system to deploy via IoT(Internet of Things). We represent here our conceptual design developed in Labview platform integrated with Arduino Uno microcontroller. The instrumentation and control system measures basic physical parameters like level, temperature and pressure using sensors. The monitoring and control of the temperature is done using virtual instrument software LabView, which acts as data acquisition module. It monitors performance and helps in controlling the nuclear plant operations to keep the process variables within the plant design limits and ensures the plant safety. The transmission of data from one end to another end is done through wireless technology ZigBee, to monitor and analyzeplant processes and equipment on the Labview platform

Correlation of the Lowest HMO Transition Energies with the Electronic Absorption Frequencies of Some Organic Dyestufts: s-Cyanines & Merocyanines

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Calculation on Absorption Frequencies of Merophosphinines & Unsymmetrical Phosphocyanines by Free Electron MO Treatment

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