The Augmentation of a Flight Control Mechanism for a Hybrid Fixed-Wing VTOL Drone for Parcel Delivery

Several companies are experimenting with multicopters drones to deliver packages to customers. Although they are less aerodynamically efficient than fixed-wing aircraft, their ability to do the vertical take-off and landing (VTOL) makes them ideal for delivery services. In this study, two methodologies will be used to build the drone which is software simulation and experimental approach. Software such as SIMNET is used to simulate and design an electronic operation of the drone while Mission Planner is used to setup the flight controller. Electronics layout is done prior to ensure a clear sight of work, components and information through the software. The flight controller used is called Pixhawk which is an open hardware mainly used for drone. The radio control system is also setup to be used as the link to control the flight controller. Flight tests were also performed to study the behavior of the UAV at various percentage of throttle. At 60 percent throttle, the drone yaws continously to the left at 63.43 degrees at 4.879 degrees per second during test flights. With a payload weight of 516g, it tilted to the front nose down, with support provided at the tip of the left wing. With more design and calibration advancements, experimental findings that are similar to theoretical outcomes might be attained. Flight data after each test flight is extracted from the software and analysed for further improvement. The fabrication of complete prototype could not be finished within the stipulated time due to a delay in acquiring new parts such as propeller due to a problem, as well as procuring the appropriate material for the wing. A test of the drone motions including roll, pitch, and yaw, is also carried out using flight charts to validate the suggested design parameter. The drone tends to fly better with the motor turning with the same orientation rather than turning with different orientation due to better stability. This flight chart allows users to choose the best design parameters by determining the length of the wingspan, motor RPM, and propeller diameter that are expected to meet the performance requirements in these three flying motions. The procedure for estimating the UAV's battery usage has also been presented in the flight chart

eWOM : The effect of online review and food quality on the intention to visit a restaurant / Arnieyantie Abdul Hadi

The rapid development of the food establishment industry witnessed the online reviews for restaurants becoming a significant tools for restaurant owners to increase their sales, image and customers. Thus, this research is conducted to measure the effect of online reviews on intention to visit restaurants. The study was conducted by distributing a self administered questionnaire involving 156 respondents and analyzed using Statistical Package for the Social Sciences (SPSS) version 20. All variables measured was significantly influence the consumer's intention to visit restaurants, especially in terms of positive online reviews (eWOM), negative online reviews (eWOM) and online food quality reviews. Moreover, the results showed a positive relationship between positive online reviews, negative online reviews and food towards consumer intention to visit restaurant. The result also demonstrated that food quality online reviews was least effected on consumer intention to visit restaurant with lowest correlation value. The study confirmed that the online reviews became crutial in improving the quality of sales, image, food and also service of the restaurant

Leadership, task load and job satisfaction: A review of special education teachers perspective

There are studies that prove that, leadership affects every thing in an organization. There are even opinions stating that leadership is a mirror to the organization it leads. In determining the success or failure of an organization, leadership is also one of the key factors. So it is undeniable that, leadership is also what determines the workload and also the job satisfaction of a staff in the organization. Discussions on leadership do not stop in a large organization, but are also widely discussed within the scope of a school. Previous studies have shown that the influence of leadership is very large in determining the climate of a school. There are also studies that lead to a more focused part of the school that is special education. This survey was conducted to examine the influence between the leadership of head teachers, workload and job satisfaction of special education teachers. The findings of this study are expected to provide a more focused picture of special education

Comparison of Current–Voltage Response to Diagnostic X-rays of Five Light-Emitting Diode Strips

Light-emitting diodes (LEDs) have miscellaneous applications owing to their low cost, small size, flexibility, and commercial availability. Furthermore, LEDs have dual applicability as light emitters and detectors. This study explores the current–voltage (C–V) response of LED strips exposed to diagnostic x-rays. Cold white, warm white, red, green, and blue LED strip colors were tested. Each strip consisted of 12 LED chips and was connected to a multimeter. The variable diagnostic x-ray parameters evaluated were kilovoltage peak (kVp), milliampere-seconds (mAs), and source-to-image distance (SID). The radiation dose was also measured using a dosimeter simultaneously exposed to x-rays perpendicularly incident on the strips. Lastly, the consistency of C–V responses, and any possible degradation after 1–2 months was also analyzed. Each LED strip color was ranked according to its C–V response in each of the investigated parameters. The LED strip color with the best cumulative rank across all the tested parameters was then examined for reproducibility. Our findings revealed that the C–V responses of LED strips are (a) generally low but measurable, (b) inconsistent and fluctuating as a consequence of kVp variations, (c) positively correlated to mAs, (d) negatively correlated to SID, and (e) positively correlated to dose. Overall results suggested cold white LED strip as most feasible for x-ray detection—in comparison to examined colors. Additionally, the reproducibility study using the cold white LED strip found a similar trend of C–V response to all variables except kVp. Outcomes indicate that LED strips have the potential to be exploited for detecting low dose (~0–100 mGy) diagnostic x-rays. However, future studies should be carried out to increase the low C–V signal