487 research outputs found
EMC oxidation under high temperature aging
No full textEpoxy molding compound (EMC) is widely used for encapsulating automotive electronics. Among all of the components of an electronic package, EMC is most exposed to the atmosphere, and thus undergoes aging. During high-temperature operation, EMC is oxidized, which alters its mechanical properties, and thus can affect the reliability of electronic components. This chapter focuses on four key aspects of EMC oxidation – (1) the growth of EMC oxidation layer, (2) the mechanical properties of oxidized EMC, (3) the effect of oxidized EMC on thermomechanical behavior of a molded package, and (4) the effect of EMC oxidation on solder joint reliability. This study utilizes various experimental characterization techniques as well as finite element simulation-based analysis.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Components, Technology and Material
EMC Oriented ISR Design
No full textElectromagnetic Compatibility (EMC) is a growing issue in the automotive industry. Integrated Circuits (IC's) must adhere to strict Electromagnetic Emission (EME) and Electromagnetic Susceptibility (EMS) regulations to ensure safety in the automotive vehicle. The Internal Supply Regulator (ISR) plays a critical role in the EMC performance of an IC.In this thesis, four types of linear regulator topologies are defined, based on the output stage: NMOS series, PMOS series, NMOS shunt, and PMOS shunt. Several important parameters are defined to describe the performance of a regulator. These are used to compare the four topologies. Only shunt regulators were found able to have good performance in both emission and Power Supply Rejection (PSR). Unfortunately, they come with some disadvantages, especially in power efficiency.A dual loop concept is proposed in order to alleviate these disadvantages. The concept is analyzed on system level and specifications are determined for the system blocks. The system blocks were then implemented on circuit level. Simulations have been performed on each system block. They confirm an improvement in terms of emission and PSR compared to the ISR that is currently used within NXP. Especially the performance in emission shows great improvement; The attenuation for all frequencies in the band ofinterest is approximately 30dB. A power efficiency that is only slightly larger than the series topologies has been achieved.Electrical Engineering | Microelectronic
Alternative EMC measurements for teaching purposes
No full textIntroduction: Electromagnetic Compatibility (EMC) means the ability of a device to function properly in its intended environment without introducing intolerable electromagnetic interference in that environment [1]. EMC education is a part of electrical and electronic engineering curriculum in many Universities. Full-Compliance EMC measurements require special measurement environment and equipment that are not available in many Universities for teaching purposes.
This paper presents alternative measurement methods for demonstrating different EMC phenomena. These methods are simple and easy to realise with basic electronics measurement equipment in a normal teaching laboratory. The presented measurements are divided according to the EMC test standards. Each presented measurement and test method has been tested. Simple digital electronics boards and Raspberry PI computer have been used as example devices. This paper is based on a Licentiate thesis made by the main author during 2015-2016 [2].
It is important to underline that these measurement methods are not comparable to standard tests but these can be used to learn and better understand different EMC phenomena and design rules to make a device EMC compliant. These measurements can also help students to better understand general electromagnetics from engineering perspective. In addition to teaching purposes, these measurement methods are suitable to be used for the EMC troubleshooting and EMC Pre-Compliance testing in prototype phase or to check the effectiveness of design changes after failed standard measurement and before a retest
Information Storage and Management: Storing, Managing, and Protecting Digital Information in Classic, Virtualized, and Cloud Environments
No full textThe new edition of a bestseller, now revised and update throughout! This new edition of the unparalleled bestseller serves as a full training course all in one and as the world's largest data storage company, EMC is the ideal author for such a critical resource. They cover the components of a storage system and the different storage system models while also offering essential new material that explores the advances in existing technologies and the emergence of the "Cloud" as well as updates and vital information on new technologies. Features a separate section on emerging area of cloud comput
Toward emerging technologies through the IEEE EMC Society
No full textThe author synthesizes the evolution of his own scientific activity toward some emerging technologies, along a path that has received notable benefit from the support provided by the IEEE Electromagnetic Compatibility (EMC) Society during the last 20 years. The globalization of industrial processes requires a strong commitment of the EMC community toward the development and the exploitation of new technologies. This paper is a contribution to this thesis. © 2007 IEEE
EMC in power electronics
No full textElectronics professionals will find this book invaluable when designing power equipment, because it describes in detail how to cope with the problem of electromagnetic interference. The author shows how to meet the exacting US and European EMC standards for conducted emissions.The book includes a wide range of EMI analysis techniques. An important focus is on the energy content of interference transient signals (traditional analysis concentrates on amplitude and frequency). This provides a more accurate picture of the EMI situation. For those who do not want or need detailed analysis techniqu
Language variation in electronic text-based messages: the social differentiation of representing speech and orality in EMC
No full text2013 Summer.Includes bibliographical references.This investigation presents a sociolinguistic interpretation of the extralinguistic factors that play a role in language variation among users of electronically-mediated communication (EMC). EMC scholarship routinely comments on the nature of written language use to represent speech and orality in EMC. Often the use of reduced colloquial variants to represent speech in EMC, such as gonna, ima, diz, etc., is associated with younger users and medium variables. Despite popular perceptions about language use in electronic environments, however, little is known about the extent to which age differentials and stylistic variations shape language use in EMC. Analysis of email and mobile phone text message data gathered from 33 participants between the ages of 18-38 indicates that the decision to represent speech and orality in EMC with the use of colloquial variants is not significantly correlated with younger participants. Instead, analysis of the data from 2,542 electronic text-based message (ETM) transmissions containing 47, 739 words reveals that only logographic features (e.g. acronyms and abbreviations) can be associated with age. The findings indicate that members of the oldest age group have retained the use of logographic features in their electronic encounters from the time when they were the most remarked feature in EMC. As with the dimension of stylistic variation, the level of formality appears to be the greatest indicator of language variation in EMC. The implications suggest that EMC scholarship needs to broaden its view of language use in ETMs regarding the use of informal variants. The practice of representing aspects of speech and orality may no longer be a phenomenon that can be primarily associated with medium variables or with teenagers and young adults
Validation tests for transmission line matrix method in EMC calculations
No full textSevgi, Levent (Dogus Author) -- Conference full title: 2003 IEEE International Symposium on Electromagnetic Compatibility, EMC 2003; Istanbul; Turkey; 11 May 2003 through 16 May 2003.Transmission line matrix (TLM) method algorithm is validated against exact analytical solutions for a typical EMC problem. The two test problems chosen for this purpose are the determination of fields inside a PEC resonator excited by a pulsed source distribution and the determination of the radiated fields from an aperture on the wall of the resonator. Almost perfect agreement was obtained between the TLM solutions and corresponding analytical results both in time and frequency domains. Results show that TLM can be used in an efficient way in addressing SE calculations and can also be applied to the calculation of EM fields in similar complex EM problem environments
Electromagnetic Compatibility (EMC) requirements for military and commercial equipment
No full textUntil approximately 1970, radio frequency (RF) requirements were driven by military usage, and electromagnetic compatibility (EMC) efforts were conducted by the military and a few select industries. This was largely due to the fact that limited applications and high costs had kept the use of consumer electronics to a minimum. The past three decades, however, have seen a fundamental shift in this status quo. Starting with the emergence of the microprocessor in the mid-70s, commercial applications began to take the lead of technology development and the consumer market has grown exponentially. Widespread use of electronics in both the military and private sectors has impacted the available use of the RF spectrum. As the demands for "connectivity" continue to grow, wireless capabilities are competing for the bandwidth necessary to handle the expanding flow of information society has come to expect. As consumer usage has come to drive electronic development, the military also finds itself in the position of adopting and adapting commercial technology. This study examines the origins of the military and commercial requirements that regulate EMC, evaluates the adequacy of these requirements with respect to current spectrum demands, and investigates the potential for harmonizing military and commercial EMC assessments.Approved for public release; distribution is unlimited.Naval Sea Systems Command author (civilian).http://archive.org/details/electromagneticc10945463
Finding key performance indicators and forecasting project performance in construction industry - Case EMC Talotekniikka
No full text1. Introduction
1.1 Topic area and research questions
The research is a case study. The aim is to use the data provided by Electro Mechanical Contracting (EMC) Talotekniikka and discover the most important parts of its projects' historical development. This case study was commissioned by the management of EMC Talotekniikka to produce a report to assist them with their current issues of unprofitable projects and forecasting.
Many factors influence the outcome of projects in construction industry. This report will mainly concentrate on the parts that are related to project performance and forecasting methods before and during the project. The issues addressed are:
1. Possible pitfalls of the current EMC Talotekniikka forecasting methods.
2. Possible indicators providing insight into determining said pitfalls in individual projects.
3. Explicit factors enabling the management to make forecasting more accurate.
EMC Talotekniikka's current forecasting methods are somewhat unreliable and thus the management is looking to find ways to improve them. Therefore, in this study certain figures from each project have been analyzed in order to find key performance indicators (KPIs) demonstrating that the project is not going as planned.
This report will not focus on analysis of projects started before 2009. Neither does it focus on the methods of leadership employed by EMC Taloteniikka's management.
Major sources of data were:
? Interviews with the project controller of EMC Talotekniikka Esa Ruotsalainen
? A study conducted by the author: Analyzing EMC Talotekniikka's current projects and figures
? Database provided by EMC Talotekniikka, including all the necessary figures
The first part tells about construction industry in general. The second part explains the importance of forecasting and introduces different forecasting methods. The third part introduces the concept KPIs. The fourth part of the report presents the current situation of EMC Talotekniikkas's projects and presents the basics for the study and. In addition, it focuses on analyzing the past data to find aforementioned KPIs to help forecasting. The last part provides recommendations for EMC Talotekniikka on how to make their forecasting more accurate and how to compete and succeed under the current circumstances
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