ARDUINO BASED WIFI ENABLED WIRELESS SPEAKER

This project is to create a system to wirelessly broadcast an audio signal from a computer to a set of speakers using Wi-Fi. This allows one to play music files from a computer and have the sound come out of any speakers that are in range of the wireless network. The ideal use case for this product would involve the ability to have a computer in one room processing music files while multiple speakers throughout the house are actually playing the music. This would be particularly useful in a party setting where one would like to keep a computer safe in a locked room while still being able to use it to play music. Additionally, if a party is there are sets of speakers in multiple rooms, they can all be synced to the same audio source. The major components of the system are the microcontroller receiver module (an ATMega 328p) and the computer program that sends the packetized audio data. This is to create a system that uses Wi-Fi to transmit audio from a source such as a laptop to a speaker system. The final product combines the use of embedded harware, low level software programming, and the IEEE 802.11 standard protocol for wireless communication (Wi-Fi) to create a polished end device. The hardware and software was developed using a combination of original work as open source code and libraries

FORMULATION AND EVALUATION OF PERINDOPRIL MICROENCAPSULES BY USING DIFFERENT POLYMER

Objective: The study was carried out with an objective to achieve a potential sustained release oral drug delivery system of an antihypertensive drug, Perindopril which is a ACE inhibitor having half life of 2 hours. Perindopril is water soluble drug, so we can control or delay the release rate of drug by using release retarding polymers. This may also decrease the toxic side effects by preventing the high initial concentration in the blood.Method: Microcapsules were prepared by solvent evaporation technique using Eudragit L100 and Ethyl cellulose as a retarding agent to control the release rate and magnesium stearate as an inert dispersing carrier to decrease the interfacial tension between lipophilic and hydrophilic phase. Results: Prepared microcapsules were evaluated for the particle size, percentage yield, drug entrapment efficiency, flow property and in vitro drug release for 12 h. Results indicated that the percentage yield, mean particle size, drug entrapment efficiency and the micrometric properties of the microcapsules was influenced by various drug: polymer ratio. The release rate of microcapsules could be controlled as desired by adjusting the combination ratio of dispersing agents to retarding agents.Conclusion:Perindopril microcapsules can be successfully designed to develop sustained drug delivery, that reduces the dosing frequency and their by one can increase the patient compliance

A 15-Channel receive array and 16 channel detunable transmit coil for human brain imaging at 9.4T

The radio frequency (RF) magnetic field (B1) distribution becomes more complex in MR experiments employing higher static magnetic field (B0) due to shorter wavelength in tissue. The B1 + inhomogeneities from a predefined volume of interest is reduced by influencing the amplitude and phase of the transmit current on a transceiver array coil [1, 2]. Significant gains in SNR was achieved at 7T using 32 channel receive arrays assembled on close fitting formers [3, 4]. In this study, we combine the benefits of these two methods for human brain MRI at 9.4T (400MHz). Our imaging setup consists of a 15-element receive array together with a 16-element actively detunable transmit array and hence the additional flexibility to employ RF shimming methods

Radio Frequency Coils for Ultra-high Field Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) has become a powerful tool not only to analyze the anatomical structures of the human body non invasively but also to investigate brain activity with functional MRI. The promise of increase in signal to noise ratio and spectral resolution proportional to the main magnetic field strength motivated a few research laboratories to pursue even higher field strengths. The 9.4T whole body human scanner and the 16.4T animal scanner installed at the Max Planck Institute for Biological Cybernetics, Tuebingen were, for many years, the worlds strongest magnets in their respective categories. In addition to the strong magnets, radio frequency (RF) coils are also equally important in realising the benefits offered by the high field MRI scanners. The aim of this thesis work is to develop optimized RF coils and RF hardware for ultra-high high field MRI

Design and Constructability of Wide-Flange UHPC Bridge

Construction of highway bridge girders using conventional prestressed concrete is a widely accepted norm in the state of Texas. But the limited life and the lengthy on-site construction work is a serious concern to the travelling public. This research looks into the design and constructability of slab-on-girder Ultra High-Performance Concrete (UHPC) bridge spans using different configurations. One associated feature is to minimize the number of field activities in the construction process. Therefore, the use of wide flanges of varying thicknesses are investigated. The thesis evaluates five UHPC design scenarios, which are compared to the standard TxDOT way of constructing highways with Tx54 girders using normal concrete. Because the wide flange topped girders are entirely cast off-site, deflection control is important to ensure the ride surface remains as flat as practicable. The different longitudinal girder-to-girder connection options are investigated. For each design, detailed estimates are made together with construction engineering schedules. Results show that the most economical solution that may be rapidly constructed following the principles of accelerated bridge construction (ABC) used a full-thickness flange. By contrast, the most enduring solution had a half-depth field cast topping which was transversely post-tensioned to actively tie all units together to mitigate the possibility of longitudinal cracking at the girder-to-girder connections

Perceived Stakeholder and Stockholder Views: A Comparison Among Accounting Students, Non-Accounting Business Students And Non-Business Students

In this study, I tested the perceived attitudes of students towards Corporate Ethics and Social Responsibility (CESR). I assessed whether students within a particular major are more or less likely to exhibit ethical reasoning compared to students within other majors. Specifically, I tested the perceived differences in stakeholder and stockholder views among accounting, business, and non-business students. I conducted the study utilizing the Perceived Role of Ethics and Social Responsibility Scale (PRESOR) while controlling for gender, age, work experience, and degree of religiosity. Results show that accounting students generally have a higher perception of stakeholder views and a lower perception of stockholder views than other business and non-business students. Other business students identify more with stakeholder views and less with stockholder views than non-business students. Lastly, non-business students associate more with stockholder views than accounting and other business students