Design And Fabrication Of Modular Fixture To Accommodate Flexible Assembly Systems

In the development of a modular fixture design system, it is essential to have a modular fixture specific information measurement that can be integrated with a CAD system, in addition to the other considerations such as fixture configuration, interference checking, etc., which are also important to fixture designers. The initial conditions for modular fixture assembly are established together with geometric relationships between fixture components and the workpiece to be analyzed. Of particular focus is the design of alternative locating points and components, together with examples of the 3-D fixture designs. Examples of fixture design generated by the system are also provided to illustrate the development. This thesis describes a method to create the fixture element database and model the fixturing towers like assembly of modular fixture. The main purpose for this project is to get the optimum of the modular fixture based on assembly process in order to make the product productivity and can reduce time in assembly and saving costs. The result in this case shows that the fixtures can be applied in many assembly situation such as assembly of 3-pin plug, optical mouse and alarm clock

Prospect of ITESCM (integrated tertiary educational supply chain management) model based on ICT application

This research exhibits the prospect of ITESCM (Integrated Tertiary Educational Supply Chain Management) model through ICT (Information and Communication) application. The ITESCM model was developed by Dr. Mamun Habib in 2010 for tertiary academic institutions which addresses the integrated form of supplied inputs, supplied outputs, education supply chain, research supply chain and educational management for universities [17]. Four main activities, includes education development, education assessment, research development, and research assessment in four aspects, namely Programs Establishment, University Culture, Faculty Capabilities, and Facilities were investigated at three decision levels. Model structures were defined and confirmed by 493 respondents, representing University administrators of world-ranking universities, faculty and staffs, employers, and graduates. The resulting structure was subsequently evaluated for accuracy and validity by multiple linear regression (MLR) analysis and the structural equation modeling (SEM) technique.This empirical study represents two contributions in terms of human resource contribution and research contribution to the end customer, i.e. the society. The ICT application of ITESCM model provides a novel approach for prospective investors or current administrators of the universities to review and appraise their performance with comparing other universities toward fulfillment of ultimate goals, i.e. producing high‐competent graduates and significant research outcomes for the well‐being of the society

Assessment Of Neutralized Waste Cooking Oil As A Potential Transformer Dielectric Liquid

When an oil-immersed transformer fails because of a short circuit, fire can occur because of the relatively low flash point of the mineral insulating oil. One of the ways to overcome this problem is to replace mineral insulating oil with vegetable-based insulating oils of higher flash points. This study explores the potential of waste cooking oil as a transformer dielectric liquid. The waste cooking oil used in this study is a vegetable-based oil with a high flash point. However, its acidity is above the permissible limit, which hinders its use in transformers. Therefore, the waste cooking oil was neutralized with caustic soda (normality: 1.0, 2.0, 3.0, 4.0, and 5.0 N) at a temperature of 70°C and stirring speed of 400 rpm for 5 min. The physical, chemical, and electrical properties of the neutralized waste cooking oil samples were determined. The results showed that the waste cooking oil neutralized with caustic soda (normality: 2.0 N) had the lowest acidity (0.2825 mg KOH/g). The breakdown voltage and viscosity of this oil sample were 29 kV and 40.92 mm2/s, respectively, which fulfilled the specifications of the IEEE C57.147 standard. In addition, this oil sample had a flash point of 260°C, which fulfilled the requirement of the IEC 62770 standard. Based on these results, it can be concluded that the neutralized waste cooking oil sample (normality: 2.0 N) has potential as a transformer dielectric liquid

Effect of indium pre-flow on wavelength shift and crystal structure of deep green light emitting diodes

金沢大学先端科学・社会共創推進機構To produce a deep green (530 nm–570 nm) LED, the suitable indium (In) composition in the InxGa1-xN/GaN multi-quantum well (MQW) structure is crucial because a lower indium composition will shift the wavelength of emission towards the ultraviolet region. In this paper, we clarify the effects of an indium-rich layer to suppress such blue shifting, especially after the annealing process. According to characterizations by the uses of XRD and TEM, narrowing of the MQW layer was observed by the indium capping, while without the capping, the annealing results in a slight narrowing of MQW on the nearest layer to the p-type layer. By adding an indium capping layer, the blue shift of the photoluminescence was also suppressed and a slight red shift to keep green emission was observed. Such photoluminescence properties were consistent with the tiny change of the MQW as seen in the XRD and TEM characterizations

Predictors of academic achievement in Information Technology

Computers are clearly increasing in importance in Malaysia society and educational institutions. As a result of the increased awareness of computers and its impact on society. Information Technology (IT) and other computer studies courses have rapidly become established as part of the curriculum in most universities from all around the world

Potential Of Used Cooking Oil As Dielectric Liquid For Oil-Immersed Power Transformers

This paper presents the potential of using treated used cooking oil as a potential dielectric liquid for high-voltage power transformers. The acidity of used cooking oil is higher than the prescribed limit of natural ester for power transformers. Hence, this paper proposes a combination of treatment methods to reduce the acidity of used cooking oil to less than 0.06 mg KOH/g. The treatment methods are: (1) alkaline refining, (2) bleaching and (3) synthetic silicate treatment. The physicochemical and electrical properties (acidity, color, density, flash point, viscosity, water content, breakdown voltage and dissipation factor) of the treated used cooking oil are measured according to standards. The results show that the acidity of the treated used cooking oil is 0.0182 mg KOH/g, which is 99.67% lower than the initial value of 5.4664 mg KOH/g. This acidity is achieved by implementing the following treatment methods: (1) alkaline refining using caustic soda (normality: 2.0N); (2) two cycles of bleaching with Fuller earth’s adsorbent (concentration: 10 wt%) in each cycle; and (3) treatment with synthetic silicate absorbent (concentration: 15 wt%). In addition, combined treatment methods affect the color rating of the treated used cooking oil, where the color rating is L0.5. The breakdown voltage and dissipation factor at 90 °C of the treated used cooking oil are found to be 100kV and 0.00688, respectively. The other physicochemical properties (density, viscosity and water content) of the treated used cooking oil fulfills the BS EN 62770 standard except for the flash point, with a value of 234 °C

Succinyl-κ-carrageenan Silver Nanotriangles Composite for Ammonium Localized Surface Plasmon Resonance Sensor

This research investigates the physicochemical properties of biopolymer succinyl-κ-carrageenan as a potential sensing material for NH4+ Localized Surface Plasmon Resonance (LSPR) sensor. Succinyl-κ-carrageenan was synthesised by reacting κ-carrageenan with succinic anhydride. FESEM analysis shows succinyl-κ-carrageenan has an even and featureless topology compared to its pristine form. Succinyl-κ-carrageenan was composited with silver nanoparticles (AgNP) as LSPR sensing material. AFM analysis shows that AgNP-Succinyl-κ-carrageenan was rougher than AgNP-Succinyl-κ-carrageenan, indicating an increase in density of electronegative atom from oxygen compared to pristine κ-carrageenan. The sensitivity of AgNP-Succinyl-κ-carrageenan LSPR is higher than AgNP-κ-carrageenan LSPR. The reported LOD and LOQ of AgNP-Succinyl-κ-carrageenan LSPR are 0.5964 and 2.7192 ppm, respectively. Thus, AgNP-Succinyl-κ-carrageenan LSPR has a higher performance than AgNP-κ-carrageenan LSPR, broader detection range than the conventional method and high selectivity toward NH4+. Interaction mechanism studies show the adsorption of NH4+ on κ-carrageenan and succinyl-κ-carrageenan were through multilayer and chemisorption process that follows Freundlich and pseudo-second-order kinetic model

Chlorophyll Detection by Localized Surface Plasmon Resonance Using Functionalized Carbon Quantum Dots Triangle Ag Nanoparticles

An optical sensor-based localized surface plasmon resonance (LSPR) sensor was demonstrated for sensitive and selective chlorophyll detection through the integration of amino-functionalized carbon quantum dots (NCQD) and triangle silver nanoparticles (AgNPs). The additions of amino groups to the CQD enhance the detection of chlorophyll through electrostatic interactions. AgNPs-NCQD composite was fabricated on the surface of the silanized glass slide using the self-assembly technique. The experimental results showed that the AgNPs-NCQD film-based LSPR sensor detects better than AgNPs and AgNPs-CQD films with a good correlation coefficient (R2 = 0.9835). AgNPs-NCQD showed a high sensitivity response of 2.23 nm ppm−1. The detection and quantification limits of AgNPs-NCQD are 1.03 ppm and 3.40 ppm, respectively, in the range of 0.05 to 6 ppm. Throughout this study, no significant interference was observed among the other ionic species (NO2−, PO4−, NH4+, and Fe3+). This study demonstrates the applicability of the proposed sensor (AgNPs-NCQD) as a sensing material for chlorophyll detection in oceans

Localized Surface Plasmon Resonance Decorated with Carbon Quantum Dots and Triangular Ag Nanoparticles for Chlorophyll Detection

This paper demonstrates carbon quantum dots (CQDs) with triangular silver nanoparticles (AgNPs) as the sensing materials of localized surface plasmon resonance (LSPR) sensors for chlorophyll detection. The CQDs and AgNPs were prepared by a one-step hydrothermal process and a direct chemical reduction process, respectively. FTIR analysis shows that a CQD consists of NH2, OH, and COOH functional groups. The appearance of C=O and NH2 at 399.5 eV and 529.6 eV in XPS analysis indicates that functional groups are available for adsorption sites for chlorophyll interaction. A AgNP–CQD composite was coated on the glass slide surface using (3-aminopropyl) triethoxysilane (APTES) as a coupling agent and acted as the active sensing layer for chlorophyll detection. In LSPR sensing, the linear response detection for AgNP–CQD demonstrates R2 = 0.9581 and a sensitivity of 0.80 nm ppm−1, with a detection limit of 4.71 ppm ranging from 0.2 to 10.0 ppm. Meanwhile, a AgNP shows a linear response of R2 = 0.1541 and a sensitivity of 0.25 nm ppm−1, with the detection limit of 52.76 ppm upon exposure to chlorophyll. Based on these results, the AgNP–CQD composite shows a better linearity response and a higher sensitivity than bare AgNPs when exposed to chlorophyll, highlighting the potential of AgNP–CQD as a sensing material in this study