Development of a metalised carbon fiber reinforced plastic (CFRP) antenna reflector for satellite communication

The Antenna reflectors made of Carbon Fibre Reinforced Plastics (CFRP) are used in spacecrafts for Satellite Communication in C, S and Ku bands. For futuristic Satellite Communication applications in x2018;Kax2019; band, there is a need of improving the reflectivity for Radio Frequency (RF) signals by metallising the surface of CFRP reflectors. The space qualified CFRP reflectors have been developed by ISRO for various GEOSAT projects but the process for developing a space qualified reflector having a metallized surface has not been established in the country. Recently, efforts in this hither to fore unexplored domain have been made jointly by Space Application Center, Ahemadabad and National Aerospace lab, Bangalore to develop reflectors with metallized surface

FORMULATION AND EVALUATION OF FAST DISSOLVING TABLETS OF RANITIDINE HYDROCHLORIDE BY HOLE TECHNOLOGY

Attempts were made to prepare ranitidine fast dissolving tablets by Novel Hole technology. When these fast dissolving tablets contact with gastro intestinal fluids, the fluid will enters the hole present in the tablet and immediate breaking of the tablet is going to takes place. This fast disintegration of tablets is also influenced by the formation of new absolute area. The prepared FDTs were subjected to various pre and post formulation studies. Its disintegration and dissolution rates were compared with the control formulation (without hole).In-vitro drug release of FDTs (DH6) showed almost 100.92percent of the drug was released at 6th minute, whereas the control formulation D12, shows the 99percent drug release at 20th minute. Overall, this technique is novel and most useful for formulation into fast dissolving tablets.Key words: Novel Fast Dissolving Tablets, Ranitidine, Hole technolog

MODULATION AWARE CONNECTION ADMISSION CONTROL AND UPLINK SCHEDULING ALGORITHM FOR WIMAX NETWORKS

Mobile WiMAX standard defines air interface for mobile broadband wireless access (BWA) systems and aimed to provide high data rate with seamless mobility while maintaining the quality of service (QoS). However, QoS of real-time applications depends on the link quality, which necessitate the channel-aware connection admission control (CAC) and scheduling schemes. In this paper Modulation aware CAC scheme and base station (BS) uplink scheduling algorithm are proposed to improve the system capacity and QoS performance respectively. The proposed CAC scheme aims to increase the admission of higher priority real time services by degrading the bandwidth of admitted lower priority connections on the basis of their channel status without deteriorating their QoS performance much. The performances of proposed algorithms are evaluated through simulation by considering the metrics like throughput, delay and number of connections admitted

A prospective randomized trial of trans cervical Foley’s with extra amniotic saline infusion versus intra cervical prostaglandin E2 gel for induction of labour setting

Background: This study evaluated the effectiveness of Extra-amniotic saline infusion (EASI) in comparison with that of intracervical Prostaglandin E2 (PGE2) gel for cervical ripening and induction of labour.Methods: The study conducted in SDM College of Medical College Dharwad, Department of OBG, from December 2012 to November 2013. Consecutive patients with unfavorable cervices requiring pre-induction cervical ripening and induction of labour for various indications were asked to participate in this study. 50 patients (Group A) underwent extra amniotic saline infusion and 50 patients (Group B) underwent PGE2 gel application. Post induction augmentation if required was administered. Labour profile outcomes were compared between the groups.Results: Results were comparable in terms of maternal age, indication for induction in majority of cases, pre-induction Bishop Score, mode of delivery, complications and side effects, neonatal complications, and Apgar Score. The mean post induction Bishop Score was higher in EASI group by an average of 9. The mean duration of augmentation was more in PGE2 group by an average of 2 hrs. The induction delivery interval (IDI) was prolonged by an average of 3.5 hours in PGE2 group.Conclusions: For pre-induction cervical ripening the extra amniotic saline infusion is valid alternative for the PGE2 gel. Both the modes of induction were equally safe and effective in terms of mode of delivery and Apgar Score. EASI, however, had rapid cervical ripening and shorter induction delivery interval

Kikuchi-Fujimoto disease presenting as pyrexia of unknown origin

Background: Kikuchi-Fujimoto disease, a benign self-limited lymphadenopathy is an uncommon cause of pyrexia of unknown origin (PUO). Methods: We retrospectively studied the case-records of 13 patients presenting with PUO who were diagnosed to have Kikuchi-Fujimoto disease on peripheral lymph node excision biopsy and report the salient clinical manifestations and histopathological findings in them. All of them received symptomatic treatment. Results: Their median age was 28 [interquartile range (IQR) 18.5-38.0] years. Women (11/13, 84.6%) were more frequently affected. All of them were human immunodeficiency virus (HIV) seronegative. Prior to presenting to us, two were being treated for lymph node tuberculosis with DOTS. Cervical lymph nodes were predominantly involved, the distribution being: right cervical (n=10, 76.9%); left cervical (n=4); and bilateral cervical (n=2). Axillary and generalized lymphadenopathy were rare being seen in 2 and 1 patient respectively. The median (IQR) erythrocyte sedimentation rate (n=11) was 53 (35-89) mm at the end of first hour. Salient histopathological features were paracortical patchy zones of eosinophilic fibrinoid necrosis with karyorrhectic debris, large numbers of histiocytes, including histiocytes with peripherally placed “crescentic” nuclei. Spontaneous regression of fever and lymphadenopathy was observed over a median (IQR) period of 8 (6.75-10.25) months in all of them. Conclusions: Kikuchi-Fujimoto disease is a rare but important cause of PUO presenting with peripheral lymphadenopathy. Women are most often affected and cervical lymph nodes are the most frequently involved site. Clinical suspicion and thoughtful collaboration between clinicians and pathologists are essential for accurate diagnosis, and to minimize unnecessary investigations and inappropriate aggressive treatment

Software Quality Assurance-Challenges in Launch Vehicle Projects

Launch vehicle projects now depend on software, more than ever before, to ensure safetyand efficiency. Such critical software syfiems, which can lead to injury, destruction or loss ofvital equipment, human lives, and damage to environment, must be developed and verified withhigh level of quality and reliability. An overview of current quality practices pursued in launchvehicle projects is presented in this paper. These practices have played a vital role in the successfullaunch vehicle missions of Indian Space Research Organisation. As complexity of softwareincreases, the activity that gets affected is nothing but, software quality assurance (SQA). TheSQA team is facing a lot of challenges in current practices. This paper brings out such challengesin different phases of software life cycle. A set of key points to some techniques and tools, thatcould contribute to meet the software quality 'assurance challenges in launch vehicle projects,are also discussed

The sharp bound of the third Hankel determinant of the kth-root transformation for bounded turning functions

The objective of this paper is to estimate the sharp bound of the third Hankel determinant for the kth-root transformation to the class of functions whose derivative has a positive real part satisfying the normalized conditions f(0) = 0 and f′(0) = 1 in the open unit disk D := {z ∈ C : |z| < 1}

Hadron energy response of the Iron Calorimeter detector at the India-based Neutrino Observatory

The results of a Monte Carlo simulation study of the hadron energy response for the magnetized Iron CALorimeter detector, ICAL, proposed to be located at the India-based Neutrino Observatory (INO) is presented. Using a GEANT4 modeling of the detector ICAL, interactions of atmospheric neutrinos with target nuclei are simulated. The detector response to hadrons propagating through it is investigated using the hadron hit multiplicity in the active detector elements. The detector response to charged pions of fixed energy is studied first, followed by the average response to the hadrons produced in atmospheric neutrino interactions using events simulated with the NUANCE event generator. The shape of the hit distribution is observed to fit the Vavilov distribution, which reduces to a Gaussian at high energies. In terms of the parameters of this distribution, we present the hadron energy resolution as a function of hadron energy, and the calibration of hadron energy as a function of the hit multiplicity. The energy resolution for hadrons is found to be in the range 85% (for 1GeV) -- 36% (for 15 GeV).Comment: 14 pages, 10 figures (24 eps files

Integration of iron ore deposit evaluation and mine plan for selecting cost effective beneficiation operations towards improved resource utilisation: Experience at Tata Steel

In the recent past a paradigm shift in terms of resource utilization and beneficiation practices is experienced by the Indian mining and mineral sector. Depleting iron ore reserves coupled with increasing demand for low-alumina iron ore fines to improve blast furnace performance in terms of productivity and reduced slag rate necessitate intensive beneficiation of iron ore. The task is even difficult for Indian iron ores which are generally high in iron content and at the same time characterized by aluminous gangue and thereby calls for capital investment of higher order for beneficiation. In another direction, any beneficiation means rejecting some mined ore as waste for obtaining the desired product grade and involves costs. Hence, beneficiation option has to be used judiciously. Towards this, the enabler available is characterization and assessment of geological resource to explore the options of segregation, scheduling, sequencing and blending. Joda East Iron Mines (JEIM), which caters to approximately 45% of iron ore requirement of Tata Steel plant in Jamshedpur, and has its ambitious plan for upgrading existing beneficiation facilities in the form of ‘Total Beneficiation’. The paper describes the judicious beneficiation and effective utilization efforts made, in the light of characterization and assessment of deposit, mine planning over last 10 years as experienced by JEIM plant and also discuss the importance of blending of processed ores in achieving despatchable product grades to meet customer requirement while optimizing overall ore resource utilization. JEIM has modified to earlier only washing plant to present two beneficiation circuits, namely Wet and Dry Processing plants, to take care of off - and high grade ores, respectively. The Dry processing plant is quite simple, comprising crushing and dry screening with no tailings/wastes. Off grade material is concentrated through primary and secondary crushing followed by screening and oversize crushing and re-screening, washing and sizing, scrubbing, classification in classifier and hydrocyclone, with a overall weight recovery of ~87%. The journey in improving product quality while optimizing plant production in JEIM relates to changes in operational philosophy which basically could be related as “identifying correct methods of ore dressing for correct ore” in line with deposit ratio