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Critical processing steps of COB manufacturing, as implemented at Epitek, are reported. They include testing of incoming boards, cleaning, bonding parameters, bonding…
Critical processing steps of COB manufacturing, as implemented at Epitek, are reported. They include testing of incoming boards, cleaning, bonding parameters, bonding defects and statistical process control.
A set of rules is presented for printing thick film resistors, whose implementation minimises losses due to resistors firing too high or too low, and also results in the…
A set of rules is presented for printing thick film resistors, whose implementation minimises losses due to resistors firing too high or too low, and also results in the shortest possible set‐up times. To the best of the authors' knowledge, some of the concepts and relations reported here are nowhere to be found spelled out in the published literature, let alone presented in quantitative form. One example is the relationship between sheet resistance vs resistor length curves and the mesh/emulsion of the screen used to obtain such curves. Another example is the relationship between the choice (or lack of it) of resistors used to set up thickness at the beginning of a print, and the spread in resistance values. Then there are better known relationships, like the dependence of thickness on resistor width or print direction—still no quantitative data are available and the potential relevance of these effects is generally not appreciated. Long set‐up times and yield losses need not exist, as they arise from non‐rigorous printing rules which call for a standard dry thickness (usually 25±3 µm) regardless of resistor dimensions, print direction and ink jar value, and which only call for a range of screen mesh/emulsion values, rather than for specific ones. In fact, for any given sheet resistance vs resistor length curve, only one choice of screen mesh/emulsion and resistor thickness is logically possible. Also reported are experimental data relating resistor thickness to resistor length as a function of screen mesh/emulsion, resistor width and print direction as well as data on sheet resistance as a function of resistor dry thickness. Finally, results from thirty‐eight production runs are reported and discussed.
Hybrid manufacturers are uncertain as to whether laser‐drilled holes on 96% alumina are suitable for mixed‐bonded thick film conductor metallisation, or whether they…
Hybrid manufacturers are uncertain as to whether laser‐drilled holes on 96% alumina are suitable for mixed‐bonded thick film conductor metallisation, or whether they require further treatment before metallisation if reliable circuitry is to be produced. Moreover, although the metallisation of holes on ceramic through the use of screen printed thick films is fairly common in the hybrid industry, this paper shows that published information on this topic is scant, at times contradictory, and, because of proprietary constraints, generally of little use. The authors report on an extensive study in which both as‐laser‐drilled holes and thermally‐treated laser‐drilled holes are metallised using a mixed bonded Pd‐Ag conductor paste. Both encapsulated and non‐encapsulated metallised holes are then subjected to various accelerated life tests, followed by ‘power‐up’ tests to the extreme of circuit destruction. An account is also given of a printing set‐up which allows volume production of printed through‐holes without the need for special skill or attention on the part of the printing operator.
Improving the use of annotations in lecture recordings.
Requirements analysis with scenario based design (SBD) on focus groups.
These seven points have been extracted from the feedback of the focus groups: (1) Control of the annotation feature (turn on/turn off). (2) An option to decide who is able to see their comments (groups, lecturer, friends). (3) An easy and paper-like experience in creating a comment. (4) An option to discuss comments. (5) An option to import already existing comments. (6) Color-coding of the different types of comments. (7) An option to print their annotations within the context of the recording.
The study was performed to improve the open-source lecture recording system Opencast Matterhorn.
Annotations can help to enable the students that use lecture recordings to move from a passive watching to an active viewing and reflecting.
Mechanical properties of 100% polyester and polyester-viscose (P/V) blended yarns produced from polyester fibres which vary in denier and cross-sectional shape have been…
Mechanical properties of 100% polyester and polyester-viscose (P/V) blended yarns produced from polyester fibres which vary in denier and cross-sectional shape have been analyzed. It is observed that fibre fineness and cross-sectional shape play a significant role in the translation of fibre properties to the respective yarn properties. As the fibre linear density decreases, fibre strength translation efficiency increases. In the case of trilobal fibre, translation efficiency is observed to be lower, but yarn breaking elongation is higher in comparison to the corresponding circular fibre. Scalloped oval fibre contributes more towards yarn strength and elongation versus the equivalent circular and tetraskelion fibres. In the P/V blended form, a decrease in yarn tenacity does not affect fibre fineness, but is substantially influenced by changes in the fibre profile. Contribution of broken viscose fibres (comparatively weaker component) at the point of actual breaking of yarn, i.e. Z-value, is altered depending on the polyester fibre profile, which is higher in trilobal and scalloped oval fibres in comparison to the corresponding circular ones, but the role of fibre linear density in this regard is rendered insignificant.
This document presents the study of a one‐dimensional thermal inclinometer based on free convection.
A micromachined one is used. The sensitivity of the sensor is optimized in a close chamber containing CO2 gas under pressure.
By using this type of sensor in a close chamber containing CO2 gas under pressure, the sensitivity increase and the response time decrease when the pressure increase. High resolution will be achieved.
High shock reliability.
Measuring μg acceleration.
Low cost production.
This article describes a new humidity sensor using the technique of differential thermal analysis (DTA). The energy of water vaporisation is estimated via the measurement…
This article describes a new humidity sensor using the technique of differential thermal analysis (DTA). The energy of water vaporisation is estimated via the measurement of the Seebeck voltage of miniature thermocouples used in differential mode on a Peltier module causing condensation from the ambient air. This sensor uses the sensitivity of alloys V2VI3 containing [Bi, Te, Sb, Se], 400‐440μV.K–1. Experimental measurements have been performed in a climatic chamber at constant temperature. The time variation of the differential Seebeck voltage with relative humidities HR varying from 10 to 90 per cent makes it possible to identify with precision the point of water evaporation. For each value of the relative humidity, it is directly a function of the condensate mass. The integration of these curves over time makes it possible to calculate the energy of vaporisation and the condensate mass.
Purpose: The primary purpose of this study is to examine the association between Internet use, skills, and health-related Internet activities, on the one hand, and…
Purpose: The primary purpose of this study is to examine the association between Internet use, skills, and health-related Internet activities, on the one hand, and perceived health outcomes of health-related Internet use, use of healthcare services, and self-rated health (SRH), on the other hand, the latter conceptualized as gains constituting the “third digital divide.” Secondarily, we seek to examine whether the above associations are maintained after accounting for demographic characteristics.
Methodology: A nationally representative random-digital-dial (RDD) telephone household survey of Israeli adult population (aged 21 and older, N = 819). The survey measured different dimensions of Internet use – frequency, experience, Web 1.0 general consumption and health-related activities, Web 2.0 production activities (general and health-related), and content evaluation. Potential health benefits included perceived outcomes of Internet use for health purposes, use of healthcare services and SRH.
Findings: In a multiple hierarchical regression model, adjusting for demographic variables, Internet use was associated with increased use of healthcare services and better perceived outcomes of Internet use for health purposes, but not with SRH.
Research Implications and Limitations: Health-related Internet use is associated with a sense of empowerment and enhanced use of healthcare services, but – after accounting for background variables – is not associated with SRH. Limitations include self-reports and a cross-sectional design, the latter precluding inference on causality.
Practical Implications: Internet use, specifically Web 1.0 consumption activities, is associated with increased use of healthcare services and is positively associated with perceived health outcomes. No such relationships were found for Web 2.0 activities. Future technological developments in services should take the digital divide into account and design products that will benefit disadvantaged groups.
Originality/Value: While rigorously assessing various dimensions of Internet use, the study distinguishes between various benefits of Internet use in the health domain, clarifying which benefits are associated with Internet use for health purposes.
The purpose of this paper is to develop an insight into the prevalent quality and supply chain practices adopted in the contemporary Indian manufacturing industry, and…
The purpose of this paper is to develop an insight into the prevalent quality and supply chain practices adopted in the contemporary Indian manufacturing industry, and compare business performance measurements between transfusion of total quality management (TQM)–supply chain management (SCM) companies and only SCM implementing companies.
To meet the goals of this work, i.e., to ascertain contributions made by TQM–SCM practices, a reasonably large number of Indian manufacturing organizations have been extensively surveyed, through a specially designed TQM–SCM questionnaire. And the design of TQM–SCM questionnaire has been finalized through extensive literature review. Finalized TQM–SCM questionnaire was sent to around 720 industries that are implementing TQM and SCM with other related lean manufacturing practices.
The leading Indian manufacturing organizations have taken proactive initiatives to effectively improve the manufacturing by transfusing various lean manufacturing philosophies like TQM, SCM, TPM, 5S, Six Sigma, etc., for realizing enhanced manufacturing performance. The study reveals that Indian entrepreneurs have been reasonably successful in improving the business performances in the organizations by implementing combination of TQM and SCM, as TQM support to SCM is much effective and this improvement initiative has significantly contributed toward enhancing the overall manufacturing performance.
Synergy of TQM and SCM in the context of Indian manufacturing industry has been proved beneficial in terms of competitive image as well as business performance. Therefore, the whole Indian manufacturing entrepreneurs must continue to make an earnest effort in their endeavour to realize enhanced competitiveness through synergizing different business improvement initiatives. A major implication is that only SCM implementing companies should develop their supply chain through synergy of TQM–SCM after analyzing the business environment and their future plans.
Much of the attention has been given to TQM practices and SCM practices, and very few studies have been undertaken to integrate TQM and SCM practices. But as far as the authors know till now there is no study undertaken to analyze synergy status of TQM and SCM and then comparing with only SCM implementing companies in India for medium- and large-scale manufacturing class. Therefore, this study compares the transfusion of TQM–SCM with only SCM companies and can be, thus, treated as filling a gap in the extant literature. Therefore, the findings of this research paper will contribute to future research.