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Terahertz (THz) has been well known for its unique ability to propagate through non-polar packaging material. At the same time, THz wavelengths are small enough to provide meaningful imaging resolution, leading to their large potential in non-destructive evaluation. Correlation processing is a technique that has been shown to detect phase resonances in illicit chemicals, and in this paper, is extended...
We demonstrate a parameter extraction algorithm based on a theoretical transfer function, which takes into account a converging THz beam. We use material parameter extraction as a way to determine the angular profile of the apparatus.
In the present research we optimize the design of light emitting diode module produced using «chip-on-board» (COB) technology to reduce light energy losses in elements of the module. Optimization was performed using numerical simulations and experimental study of COB samples. Calculations predict that the enhancements of light extraction from COB with the optimized shape of encapsulating cover compared...
The coarse and loose nature of unbound granular road materials presents a number of challenges for conventional permittivity characterisation approaches. An alternative that appears better suited to these materials involves measuring the phase-shift at discrete frequencies through a sample of known thickness. To validate this approach against more established methods, a comparison is required on materials...
An SAR image-based technique to obtain geometry and constitutive parameters information about low permittivity lossless dielectric materials is presented. While characterization of high permittivity dielectrics is relatively affordable in SAR images, the lower power reflected back by low permittivity objects makes their characterization a challenging task. The proposed technique combines two illumination...
Permittivity of granular type material (GTM) is determined by waveguide reflection/transmission method which is considered most accurate in dielectric material characterization. In this process, GTM is mixed with another host medium. In the simulation, GTM and host medium both are assumed to have known value of complex permittivity and GTM permittivity is extracted from the observed linear relationship...
Traditional Industrial Design (TID) has been an important aspect in the NPD process within the last decades. User centered design (UCD) is a growing research field for product innovation, starting from the end of 20th century. An NPD process needs support from both design knowledge and research methodologies. Both TID and UCD focus on user's perspective when doing multi-disciplinary work together...
In this work, rice husk material from paddy had been used as the main material to fabricate the truncated pyramidal microwave absorber. To increase the reflection loss performance, square flower split ring resonator (SF-SRR) had been incorporated onto the rice husk truncated pyramidal microwave absorber. This SF-SRR structure had been located at the top part of the truncated pyramidal microwave absorber...
In this research, we propose a method to distinguish different ground materials using the reflection intensities of the waves obtained by ultrasonic sensor. In previous research, the information obtained by ultrasonic sensor is only used for checking the existence of an object, and/or measuring the distance from an existent object. To go a step further, applying the information obtained by ultrasonic...
The vision-based bin picking using object recognition has been considered as an innovative manufacturing process in industrial robotics applications. In bin picking system, pick and place tasks are performed by robot which has been processed by measuring object pose. But it has to address challenge problems such as object appearance distorted by overlapping parts, lighting variation or reflection,...
Conventionally, techniques based on micro strip and rectangular wave guides have been utilized for determining the permittivity of materials, however these techniques require elaborated procedures due to quasi-Transversal Electromagnetic mode (quasi-TEM) and Transversal Electric/Transversal Magnetic (TE/TM) propagation modes. In this paper, a new technique based on a parallel-plate wave guide concept...
Radiations from different electrical devices cause electromagnetic interference which will influence the performance realization of other electromagnetic device and cause the health concerns. The conductive sheets used for electromagnetic shielding were constructed by sandwiching the resinated brass fibers with decorative papers on both sides. The electromagnetic shielding effectiveness of the conductive...
Innovative tools and teaching practices often fail to be adopted by educators in the field, despite evidence of their effectiveness. Naïve models of educational change assume this lack of adoption arises from failure to properly disseminate promising work, but evidence suggests that dissemination via publication is simply not effective. Instead of studying the adoption or rejection of a particular...
We report the results of an action research study in which a modified mastery-based learning approach was implemented in three undergraduate engineering courses: engineering statistics, LabVIEW programming, and environmental engineering. In this paper, we describe both the action research and the modified mastery-based learning approach that was implemented. Findings from the analysis of data on student...
This paper describes new gestures on the Multi-touch table. The 2 new gestures with 3 fingers is used for minimizing of all windows that is already open and converting Aero mode. We also implement a FTIR(Frustrated Total Internal Reflection) Multi-touch table that consists of sheet of acrylic, infrared LEDs, camera and rear projector. The operation of proposed gestures is verified on the implemented...
A detailed broadband analysis of the resonant absorptions of different common explosives in the range from 0.1–6 THz is presented. Dependencies of the resonance features on different sample parameters are evaluated via spectroscopic investigation of transmission and reflection. A significant dependency on the manufacturing process is observed.
Abandoned agricultural waste pose a risk to the environmental and public health. The polyurethane and polystyrene material for designing pyramidal microwave absorber are expensive and not environmental friendly. Tropical crop residue has potential to be used in the electromagnetic testing area. Nowadays, electromagnetic absorbing materials have been increasingly important in ensuring successful Radio...
We present a method for accurate determination of refractive indices of waveguide core and cladding layers using reflective microrings. The resonant mode azimuthal order ambiguity is resolved by introducing a grating on the microrings.
Terahertz (THz) spectroscopy and imaging techniques have great potential as analytical tools in the field of heritage science. The advantages of THz technology, such as nondestructive spectroscopic imaging and tomography, are introduced including case studies of historic masterpieces.
Some researchers on effective pedagogy reveal that “teacher directed” type of learning design should be transformed into “student centered” type in that the latter will help improve student's intellectual quality in class and develop their abilities of solving the problems in real life. Teachers' integrating E-learning technologies into learning design definitely facilitates this engagement in class...
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