Computer Modeling of Tornado Forces on a Cubic Building Using Large Eddy Simulation

A tornado changes its wind speed and direction rapidly; therefore, it is difficult to study the effects of a tornado on buildings in a wind tunnel. The status of the tornado-structure interaction and various models of the tornado wind field found in literature are surveyed. Three dimensional computer modeling work using the turbulence model based on large eddy simulation is presented. The effect of a tornado on a cubic building is considered for this study. The Navier-Stokes (NS) equations are approximated by the finite difference method and solved by an implicit procedure. The force coefficients are plotted in time to study the effect of Rankine combined vortex model. The tornado is made to translate at a 0° and 45° angle, and the grid resolution is refined. Some flow visualizations are also reported to enhance understanding of the flow behavior around the cube

Static Stability and Dynamic Analysis of Barge Foaters for An Offshore Wind Turbine

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Technology mapping and adoption behaviour for sugarcane protection technologies by Dharmapuri District Sugarcane growers

Sugarcane is the second most important industrial crop in the country occupying about 5 million hectares of area with the production of 376.9 mt.  Although more than 40% of the cane area in the country is in Uttar Pradesh, Tamil Nadu ranks first in productivity of sugarcane. Even though Tamil Nadu is in higher productivity zone, the average farm level potential yield was very less which leads lot of scope for increasing production in Tamil Nadu. Sugarcane farmers from Tamil Nadu ranged from small to large. All the farmers not following all the recommended practices. Hence, a study is required to analyses the predominant technologies in the particular area and adoption behavior of the farmers to bridge the technological gap. With that idea in mind, a study has been taken up with the objectives that to document the technological mapping and to study the adoption behavior of sugarcane farmers at Subaramani Siva Co-operative Sugar Mill area in Dharmapui district of Tamil Nadu state. From Dharmapuri districts seven blocks were selected. From each block ten respondents were selected; thus 70 respondents were constituted for the study. The Study revealed that all the blocks are not similar in case of technologies, the predominant technologies are differing block to block. Adoption pattern for protection technologies reveled that integrated weed management was adopted by majority of the respondent. The technologies ‘pheromone trap’ and ‘soil trenching of recommended termiticides’ are not at all adopted by the respondents in the study area

Investigation of passive flow control techniques to enhance the stall characteristics of a microlight aircraft

This report investigates the enhancement of aerodynamic stall characteristics of a Skyranger microlight aircraft by the use of passive flow control techniques, namely vortex generators and turbulators. Each flow control device is designed and scaled to application conditions. Force balance measurements and surface oil flow visualisation are carried out on a half-model of the microlight to further investigate the nature of the flow on the aircraft with and without the flow control devices. The results indicate a clear advantage to the use of turbulators compared with vortex generators. Turbulators increased the maximum lift coefficient by 2.8%, delayed the onset of stall by increasing the critical angle by 17.6% and reduced the drag penalty at both lower (pre-stall) and higher angles of attack by 8% compared to vortex generators. With vortex generators applied, the results indicated a delayed stall with an increase in the critical angle by 2% and a reduced drag penalty at higher angles of attack

Dynamic Time Warping Approach for User Authentication of Smartphones Using Single-handed Shakes

An immense amount of private information is stored in smartphones. In order to secure information from being tapped a new form of authentication mechanism is needed. Previous unlock mechanism like pattern authentication or code based authentication are vulnerable as they are not using a person's unique attribute. In this paper, we propose a method for unlocking phones based on user?s handshakes. The gesture sensors and the proximity sensors help us capture the unique handshake of the person. This unlock mechanism makes it harder for the attacker to reproduce the same type of handshake even if he observes the shaking pattern

Indolicidin – Antibacterial activity against bacterial pathogens isolated from ocular infections

Indolicidin is a novel/ promising antimicrobial peptide (a 13 amino acid cationic antimicrobial residue present in the form of cytoplasmic granules of bovine neutrophils) and observed with a broad spectrum of antimicrobial activity against bacteria, fungi, protozoa & even viruses. In the present study, Escherichia coli was transformed with pET 21a+ plasmid carrying indolicidin gene and was expressed. The crude extracts of indolicidin samples induced with varying IPTG concentrations (5mM and 20 mM/ ml of the medium) in Min A medium were checked for antibacterial activities against clinically important ocular bacterial pathogens such as E. coli, Klebsiella sp,, Pseudomonas sp., Acenitobacter sp., Staphylococcus aureus, coagulase negative Staphylococcus aureus, Streptococcus viridans, S. pneumoniae and S. pyogens and its activity was evaluated.&nbsp

In-Cabin Radar Monitoring System: Detection and Localization of People Inside Vehicle using Vital Sign Sensing Algorithm

Radars are used in automobiles for various functionalities, starting from the obstacle alarm during vehicle reversing to advanced functionalities like autonomous driving. A practical method for monitoring people inside a vehicle for various applications (surveillance, safety, etc.) could be built using Radar. This paper presents the embedded implementation of a vital sign sensing algorithm using the radar signal processing (RSP) technique. MEX (MATLAB executable) interface is performed with the embedded C code of the vital sign sensing algorithm generated for validating the results with the RSP technique. Finally, Unit testing is performed on the developed embedded C code of the vital sign sensing algorithm to remove the dead codes and to verify whether all branches and statements in a developed algorithm are working accordingly. The embedded C code results were found to be matching precisely with the RSP technique. With the help of obtained results, we can differentiate between an adult and a baby inside a vehicle

Design, synthesis, characterization and biological evaluation of Benzothiazole-6-carboxylate derivatives

A parent benzothiazole molecule was synthesized by Jacobson synthesis, then it is subjected to treatment with various aromatic aldehydes to get the corresponding Schiff bases followed by esterification of carboxyl group by using various alcohols. The structures of synthesized compounds were confirmed by various spectroscopic methods such as IR, NMR and mass spectroscopy. The products were evaluated for their antimicrobial activity. Some of the compounds exhibited potent activity when compared with the standards

IMPROVED SPEED LOW POWER AND LOW VOLTAGE SRAM DESIGN FOR LDPC APPLICATION CIRCUITS

The design of SRAM has evolved to suffice the need of the industry in terms of speed, power dissipation and other parameters. This paper proposed a SRAM design and an attempt has been made to design circuits using dynamic logic and pass transistor logic to obtain better performance in terms of speed, power dissipation and throughput. The dynamic logic would maintain voltage degradation by using the PMOS and NMOS transistor just as the CMOS logic, even though the design cell uses majority NMOS transistors. The proposed circuits are simulated using BSIM for different CMOS feature sizes of 70 nm, 90 nm, 120 nm and 180 nm. The results obtained have been analysed and shows that the proposed circuit of 8T performs much better as compared to other circuit configurations. There is significant improvement in power dissipation by 99.64 %, delay by 99.9 %, throughput of 490 Mbps and power delay product of 99.96 %

Mobile survey engagement by older adults is high during multiple phases of the COVID-19 pandemic and is predicted by baseline and structural factors

Digital surveys, such as mobile phone ecological momentary assessment (EMA), bear the potential to assess and target individual wellbeing in a personalized, real-time approach and allow for interaction in situations when in-person contact is not possible, such as during the coronavirus pandemic. While the use of digital technology might especially benefit research in older adults who find themselves in circumstances of reduced mobility, little is known about their barriers to adherence. We investigated baseline and structural factors that predict study withdrawal and adherence from daily smartphone EMA self-report surveys in the StayWELL Study. The StayWELL study is a longitudinal, observational study on the relationship between social restrictions during the coronavirus pandemic and mental well-being in 95 community-dwelling older aged adults (67-87 years) who were participants in a randomized clinical trial using EMA. Withdrawal was associated with less research staff changes and less likely in participants that reached the study mid-point. No baseline characteristics predicted withdrawal. Main reasons for withdrawal were communication issues, i.e. staff not being able to contact participants. We found an adherence rate of 82% and no fatigue effects. Adherence was predicted by education status, study participation duration, reaching the study midpoint and time between study start and enrollment. COVID infections or supporting people in the household was not related to adherence. To conclude, it is feasible to conduct an EMA study in older people without impacting engagement during a pandemic. Furthermore, personal characteristics and smartphone operating system (Android vs. iOS) used did not relate to engagement, allowing for a broad distribution of digital health technologies. Our study adds information on single predictive variables relevant for adherence and withdrawal from EMA smartphone surveys in older people that can inform the design of future digital EMA research to maximize engagement and reliability of study results