Human Heat Energy Harvesting Using Thermoelectric Cooler

An extensive research in renewable energy harvesting is increasing due to the limitation of energy resources. The known leading renewable energy harvesting sources is such as hydroelectricity, wind and solar. This research will focus on the human heat energy harvesting which will convert human waste heat to electricity. It focuses on converting the waste heat to electricity from five area of human body such as human palm, top palm, wrist, top wrist and leg. Thermoelectric cooler is used to convert the human body heat to electricity. In this research, a booster circuit is developed to boost the small voltage to higher voltage in order to power up an LED as output indicator. Based on experimental results, the maximum output voltage from Peltier module is obtained from human palm which is 0.1 V. The voltage is able to be boosted up to 2.9 V at the voltage booster output. The output voltage generated at load is 2.47 V and the power output is 24.7 mW. The prototype board built is able to generate human heat as electricity. Human palm is the most suitable location to power-up the LED

A Comparison Study of LDPC and BCH Codes

The need for efficient and reliable digital data communication systems has been rising rapidly in recent years. There are various reasons that have brought this need for the communication systems, among them are the increase in automatic data processing equipment and the increased need for long range communication. Therefore, the LDPC and BCH codes were developed for achieving more reliable data transmission in communication systems. This project covers the research about the LDPC and BCH error correction codes. Algorithm for simulating both the LDPC and BCH codes were also being investigated, which includes generating the parity check matrix, generating the message code in Galois array matrix, encoding the message bits, modulation and decoding the message bits for LDPC. Matlab software is used for encoding and decoding the codes. The percentage of accuracy for LDPC simulation codes are ranging from 95% to 99%. The results obtained shows that the LDPC codes are more efficient and reliable than the BCH codes coding method of error correction because the LDPC codes had a channel performance very close to the Shannon limit. LDPC codes are a class of linear block codes that are proving to be the best performing forward error correction available. Markets such as broadband wireless and mobile networks operate in noisy environments and need powerful error correction in order to improve reliability and better data rates. Through LDPC and BCH codes, these systems can operate more reliably, efficiently and at higher data rates

Evaluation of a Product Development Process through Uncertainty Analysis Techniques

For any product development process, limited time and resources are always a focus for the engineer. However, will the overall program goals be achieved with the provided time and resources? Uncertainty analysis is a tool that is capable of providing the answer to that question. Product development process uncertainty analysis employs previous knowledge in modeling, experimentation, and manufacturing in an innovative approach for analyzing the entire process. This research was initiated with a pilot project, a four-bar-slider mechanism, and an uncertainty analysis was completed for each individual product development step. The uncertainty of the final product was then determined by combining uncertainties from the individual steps. The uncertainty percentage contributions of each term to the uncertainty of the final product were also calculated. The combination of uncertainties in the individual steps and calculation of the percentage contributions of the terms have not been done in the past. New techniques were developed to evaluate the entire product development process in an uncertainty sense. The techniques developed in this work will be extended to other processes in future work

Simulation of Visual Servoing in Grasping Objects Moving by Newtonian Dynamics

Robot control systems and other manufacturing equipment are traditionally closed systems. This circumstance has hampered system integration of manipulators, sensors as well as other equipment, and such system integration has often been made at an unsuitably high hierarchical level. With the aid of vision, visual feedback is used to guide the robot manipulator to the target. This hand-to-target task is fairly easy if the target is static in Cartesian space. However, if the target is dynamic in motion, a model of the dynamics behaviour is required in order for the robot to track and intercept the target. The purpose of this project is to simulate in a virtual environment to show how to organise robot control systems with sensor integration. This project is a simulation that involves catching a thrown virtual ball using a six degree-of-freedom virtual robot and two virtual digital cameras. Tasks to be executed in this project include placement of virtual digital cameras, segmentation and tracking of the moving virtual ball as well as model-based prediction of the virtual ball's trajectory. Consideration have to be given to the placement of the virtual digital cameras so that the whole trajectory of the ball can be captured by both the virtual digital cameras simultaneously. In order to track the trajectory of the virtual ball, the image of the ball captured by the digital cameras has to be segmented from its background. Then a model is to be developed to predict the trajectory of the virtual ball so that the virtual robot can be controlled to align itself to grasp the moving virtual ball

Interaction of Radiation with Convection in Channel Flows

The interaction of convection with radiation in buoyancy induced flow in a channel is re-examined in order to better understand the effects of each flow configuration parameter. The analysis differs from that of Carpenter et al. primarily in the definition of the dimensionless temperature, which is based on the local temperature itself rather than the difference of the local and inlet temperature as chosen in. The present definition avoids the unnecessary complications introduced via the linearization of the radiative terms in which make their interpretation of the presented results rather awkward. The present results concentrate in demonstrating individually the effects of the rate of heat transfer, channel length, channel width, air inlet temperature, and surface emissivities on the temperature of the heated and adiabatic walls respectively

Host-viral Interactions: Host factors in coronavirus replication and coronaviral strategies of immune evasion

Ph.DDOCTOR OF PHILOSOPH

Non-classical polar unitals in finite Figueroa planes

published_or_final_versio

在建築地盤的熱應力和熱環境之研究

Heat stress is a recognized hazard for construction workers. To ensure safety and health of the workers, it is important to study the heat stress and thermal environment in construction sites, and develop practical solutions to avoid adverse health effects and accidents. In typical construction sites, the employees have to work long hours in thermally stressful environments, and with heavy physical workload, especially during summer time. As a result, they are at high risk and this may pose special hazards of heat stress. This research examines different kinds of heat stress indices and standards in the world. The result indicates that wet bulb globe temperature (WBGT) is a major factor affecting the level of heat stress because the rate of evaporation from human body is limited when WBGT increases. It is also found that some indexes provide little common agreement for the exposure limit and time; some can only be used for preliminary heat stress evaluation. In general, metabolic rate is the most difficult part to estimate in the heat stress equation for construction workers. It is concluded that engineering and administration method is the most effective way to control heat stress. Moreover, training and education for the employees are critical preventing accidents in construction sites.postprintThe Hunan-Hong Kong Joint Symposium 2011, Changsha, Hunan, China, 1-2 July 2011. In Proceedings of the Hunan-Hong Kong Joint Symposium, 2011, p. 52-612011湘港建築設備工程技術交流會, 中國, 湖南, 長沙, 2011年7月1日至2日. 會議記錄, 2011, p. 52-6

Exergy analysis of cooling towers for optimization of HVAC systems

Conference theme: Green & Sustainable Technology Development (绿色科技与可持续发展)Exergy analysis is a useful thermodynamic technique for assessing and improving the efficiency of processes and systems. By examining the exergy destruction properties, it is possible to optimize the environmental and economic performance of the systems. This research applies exergy analysis technique to investigate and optimize the performance of evaporative cooling towers in HVAC (heating, ventilating and air conditioning) systems. The analysis is carried out in two steps. The first step considers the physical exergy of each component and process within a whole HVAC system for a typical office building. The building’s cooling load and cooling energy requirements are determined by building energy simulation software. Exergy destruction and exergy efficiency of the system are calculated from theoretical models. The result indicates that the exergy loss of cooling tower is quite significant, and the loss is affected by outdoor environment and condensing water temperature. The second step considers the chemical exergy of condensing water and outdoor air. A counter-flow wet cooling tower is investigated by experiments and theoretical models. The dry-bulb temperature and relative humidity of outdoor air are studied by an exergy approach in order to maximize the cooling tower performance. The distribution of exergy loss within the system has been shown and information to minimize exergy destruction and optimize the system efficiency can be determined.postprin

Development of a Control System and User Interface for the Quanser Shake Table II

Shake tables are often used to simulate earthquakes to test the performance of structures under seismic loads. This project focuses on implementing the Quanser Shake Table II, which is a valuable tool for conducting small-scale experimental vibration tests. This research project focused on the development of a control system and user interface for the shake table. With the aim of making the shake table easier to control, a proportional-integral-derivative (PID) controller and an intuitive graphical user interface (GUI) were developed. MATLAB was used to simulate the control system, while the graphical programming environment NI LabVIEW was used to develop the GUI. In this presentation, an overview of a closed-loop control system, the designed GUI, and the implementation results are discussed.Ope