Acoustic characterization of jet interaction with launch structures during lift-off

The structures that constitute the environment surrounding the launchvehicle affectthe noise levels experiencedbyit during liftoff. Earlier studies modeled the launch scenario by incorporating a jet impinging on plate geometries,either flat or curved, ignoring contributions from the components of the launch structures such as the launchplatform. Very little is knownaboutthe effect of the structures on the propagationof noise from the jet exhaust towardthe vehicle. This renders any effort to modify them for noise reduction quite challenging. The present study attemptsto address this concern by investigating the contribution of a principal launch structure component, namely, thelaunch platform, toward the acoustic and flowfield around a generic launch vehicle exhausting on a generic jet blastdeflector. The measurements include flowfield visualizations and aeroacoustic measurements using microphones inthe near and far field. The results indicate that the presence of the launch platform increased the noise levelsexperienced by the vehicle beyond certainL∕De. It is also observed that replacing the solid launch platform with aperforated one leads to lower levels of noise compared to the solid one but still higher than the case where launchplatform is absent

A case study of organic protected cultivation at Tirunelveli district of Tamil Nadu, India

Agripreneur is defined as an “entrepreneur whose main business is agriculture or agriculture-related”. The case study was conducted in the Tirunelveli district of Tamil Nadu. A discussion was made with the engineer cum Organic farming who was successful in organic farming for five years. He was practicing vertical gardening, terrace garden, aquaponics, hydroponics and aquaculture in an organic manner under protected cultivation in his farm at Tirunelveli. The need for research was to identify the extraordinary and unique farmer who was leading success in the field of organic farming. The objective of this case study was to bring out and narrate the facts which had been adopted to run the successful model for modern agriculture. The case study approach was made by preparing a semi-structured interview schedule, followed by the field visit, for collecting the data about the profile, skills, work experience, knowledge of the Agripreneur in agriculture and its allied sectors were identified and noted down. Thus, the study had been given a solution to efficiently utilize space and water by means of adopting terrace garden, hydroponics and aquaponics. The focus of the study was to highlight the effectiveness, adaptability and cost for other small farmers

Smart Shopping Cart

Most of the people in this modern world spend the lot of time in departmental stores. It has been found that a lot of time is being wasted particularly at the billing section. Here by this paper represents a new methodology of smart shopping cart which saves the lot of time. The cart contains a sensor RFID tag, LCD module so that the product can be scanned in the cart and the final amount is displayed in the LCD placed in the trolley itself and there by pay only the cash at the counter. On swipe the credit cards. It will overcome the barcode technology which gets lot of problem during scanning. This proposed method is safe and secure. The cost of this project is also very low. This methodology helps both the shopper and shopkeeper

Ultrafast switching time and third order nonlinear coefficients of microwave treated single walled carbon nanotube suspensions

Microwave treated water soluble and amide functionalized single walled carbon nanotubes have been investigated using femtosecond degenerate pump-probe and nonlinear transmission experiments. The time resolved differential transmission using 75 femtosecond pulse with the central wavelength of 790 nm shows a bi-exponential ultrafast photo-bleaching with time constants of of 160 fs (130 fs) and 920 fs (300 fs) for water soluble (amide functionalized) nanotubes. Open and closed aperture z-scans show saturation absorption and positive (negative) nonlinear refraction for water soluble (amide functionalized) nanotubes. Two photon absorption coefficient,beata ~250 cm/GW (650 cm/GW) and nonlinear index, gamma ~ 15 cm^2/pW (-30 cm^2/pW) are obtained from the theoretical fit in the saturation limit to the data for two types of nanotubes.Comment: 15 pages, 4 figure

Multi-Objective Optimization in Friction Welding Process Parameters on EN353 Alloy Steel using Taguchi based GRA

Joining of similar materials by varying the input factors on a continuous drive friction welding process is done in this study. The intention is to find the optimal solution in friction welding input process parameters. Among several types of welding processes, friction welding forms good metal joints. The process factors considered for this material joining practice are Upset Time (UT), Heating Time (HT), Heating Pressure (HP), Upset Pressure (UP), chemical composition and measurements of the materials. Frictional joints provide better mechanical properties, hence it is attracted by researchers. Here, EN353 is used as the specimen, for its extensive usage in the automobile and manufacturing sectors. Axial shortening, hardness testing and the temperature during welding are evaluated, compared and optimized using Taguchi Design of Experiments (DoE) scheme using L27 orthogonal array and Grey Relational Analysis (GRA)

Detection and Analysis of Lysozyme Activity in some Tuberous Plants and Calotropis Procera’s Latex

Tuber extract of all the plant species used in the study exhibited lysozyme activity confirming the ubiquitous presence of lysozyme in plants. Among the different plants screened for protein content the tuber extract of Solanum tuberosum showed highest buffer soluble protein while tuber extract of Raphanus sativus showed the lowest protein content in sodium acetate buffer (50 Mm; pH 5.0). Tuber extract of Raphanus sativus showed highest lysozyme activity among all the plant species tested in this study and the activity was increased when the tuber was extracted with sodium phosphate buffer (50mM; pH 7.0). The lowest lysozyme was observed with tuber extract of Daucus carota in phosphate buffer (50mM; pH 7.0). The latex of the tropical species Calotropis procera is well known for being a rich source of the lysozyme. Lysozyme of Calotropis procera latex is not thermo labile. It did not lose much of its activity when the latex was incubated at different temperatures for 24 hours. A positive pointer for purification of this enzyme in future. Calotropis procera lysozyme can be was specifically isolated and purified from the whole latex with ammonium sulphate precipitation with 95% saturation. Calotropis procera lysozyme retained its activity even after precipitation with ammonium sulphate and dialysis and could hydrolyse the cell wall of Micrococcus lysodeikticus.Key words: Micrococcus lysodeikticus, Tuberous Plants, Latex, Ammonium sulphate precipitation, Polyacrylamide gel electrophoresis M. Sakthivel et al. Detection and Analysis of Lysozyme Activity in some Tuberous Plants and Calotropis Procera’s Latex. J Phytol 2/11 (2010) 65-72

Scalable Network Tomography for Dynamic Spectrum Access

Mobile networks have increased spectral efficiency through advanced multiplexing strategies that are coordinated by base stations (BS) in licensed spectrum. However, external interference on clients leads to significant performance degradation during dynamic (unlicensed) spectrum access (DSA). We introduce the notion of network tomography for DSA, whereby clients are transformed into spectrum sensors, whose joint access statistics are measured and used to account for interfering sources. Albeit promising, performing such tomography naively incurs an impractical overhead that scales exponentially with the multiplexing order of the strategies deployed -- which will only continue to grow with 5G/6G technologies. To this end, we propose a novel, scalable network tomography framework called NeTo-X that estimates joint client access statistics with just linear overhead, and forms a blue-print of the interference, thus enabling efficient DSA for future networks. NeTo-X's design incorporates intelligent algorithms that leverage multi-channel diversity and the spatial locality of interference impact on clients to accurately estimate the desired interference statistics from just pair-wise measurements of its clients. The merits of its framework are showcased in the context of resource management and jammer localization applications, where its performance significantly outperforms baseline approaches and closely approximates optimal performance at a scalable overhead.Comment: Accepted to IEEE INFOCOM 2024. 11 pages, 11 figure

Screening, Identifying of Penicillium K-P Strain and Its Cellulase Producing Conditions

Cellulase production by Penicillium species are of greater interest in microbial enzyme technology. Penicillium sp. was cultivated in liquid culture medium at different carbon sources, nitrogen sources in different pH and temperature conditions. The strain of K-P with high cellulase activity was screened. The cellulase activity was 198 U/mL in the presence of fructose on day fifth. Maximum activity was recorded 154 U/mL in with the presence of ammonium nitrate on the fourth day. And maximum cellulase activity was obtained when the pH was 3.0 (129 U/mL) on day fourth. But the highest cellulase activity recorded (274 U/mL) in the presence of fructose, ammonium nitrate, pH 3.0 on the fifth day. The results showed the profiles of cellulase were produced maximum level according to which enzyme is most active in that particular environment