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Electronics Design Checklist
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Mating connectors on different assemblies checked for same pin-out Cabling scheme insures that no return currents will flow back to remote sources through earth ground. No signal cable is used to carry power to a remote device (remember the Wide Band fire..) without full and complete justification and paper trail Maximal total power Dissipation of crate-full of boards calculated against cooling system capabilities; cooling system insures that, on average, no board runs hotter than 35˚C Airflow of cooling system checked against area mechanics and local smoke detection systems to insure no blockage or restrictions. All sheets have assigned drawing number on them All sheets have drafter’s name All sheets have signed and dated check-off by designer ANSI rules for title block, grid, etc. followed on all sheets Design is fully hierarchical; no page to page connectors, no duplicate reference to same page All components have unique visible reference designators and visible component values All components have assigned PCB footprints Schematic symbols are not re-used for different parts All devices have visible and connected power and ground pins All Schematic pages have top-to-bottom, left-to-right flow Connectivity between signals is by wires and busses, not by signal names Connection dots are evident and used Power nets (e.g. VCC, VEE, GND) are global across entire design and not unique per sheet Bill of materials included in review packet Bill of Materials includes all mechanical, mounting and other nonelectrical components in addition to all electrical components Electronic Assemblies Checklist

solder joints in electronics: design for reliability - Analysis Tech

SOLDER JOINTS IN ELECTRONICS: DESIGN FOR RELIABILITY Werner Engelmaier Engelmaier Associates, L.C. Ormond Beach, FL 32174 (904) 437-8747 ABSTRACT The emerging new technologies provide ever more challenges to assure the reliability of electronic products. The ever increasing demands in electronic products for higher performance, lower cost, less space (weight) is leading to ever denser interconnection needs. This makes solder joint reliability an even more important issue with the advent of new surface mount packages and the use of surface mounted electronics in such hostile environments as the automobile and space. The new packages are characterized by larger sizes, finer pitches, and/or problematic materials which require an up-front ‘Design for Reliability (DfR)’ to meet reliability requirements. The hostile environments can include thermal excursions over temperature ranges in which multiple interactive damage mechanisms are operative. The reliability of electronic assemblies requires a definitive design effort that has to be carried out concurrently with the other design functions during the developmental phase of the product. There exists a misconception in the industry, that quality manufacturing is all that is required to assure the reliability of an electronic assembly. While of course, consistent high quality manufacturing—and all that this implies is a necessary prerequisite to assure the reliability of the product, only a DfR-procedure can assure that the design—manufactured to good quality—will be reliable in its intended application. Explicit DfR-procedures need to be employed to account and compensate, at least in part, for the prevalent damage mechanisms. This needs to be complemented with ‘Design for Manufacturability (DfM)’ which widens the process windows and takes into account the manufacturing capabilities. These demands put an increasing burden on the designers who will require a heightened technical understanding of the underlying issues and more sophisticated design tools. It is for this reason that IPC-D-279, Design Guidelines for Reliable Surface Mount Technology Printed Board Assemblies, has been developed. The ‘Design for Reliability (DfR)’ for solder attachments in electronic interconnections will be the emphasis of this paper....

Sales Tax Holiday for Clothing and School Supplies Lists of Exempt ...

Sales Tax Holiday for Clothing and School Supplies Lists of Exempt Items APPENDIX A List of School Supplies Eligible for the Exemption “School supply,” means an item that is commonly used by a student in a course of study. For purposes of the sales tax holiday, the term includes, “school art supply,” “school instructional material,” and “school music supply.” The term does not include computers or “school computer supplies”, and such items may not be purchased exempt of the tax. The following is an all-inclusive list of items that are included in the term “school supply” and are therefore exempt from tax during the sales tax holiday period, provided their sales price is $20 or less per item. Only the following items are exempt as school supplies. Items need not be intended for use in school or in connection with a school activity to be eligible for the exemption. • • • • • • • • • • • • • • • • • • • • • • • • • • Binder pockets Binders Blackboard chalk Book bags Calculators Cellophane tape Clay and glazes Compasses Composition books Crayons Dictionaries and thesauruses Dividers Erasers (including dry erase marker erasers and dry erase marker cleaning solution) Folders: expandable, pocket, plastic, and manila Glue, paste, and paste sticks Highlighters Index card boxes Index cards Legal pads Lunch boxes Markers (including dry erase markers and dry erase marker kits) Musical instruments, musical instrument accessories, and replacement items for musical instruments Notebooks Paintbrushes for artwork Paints (acrylic, tempera, and oil) • • • • • • • • • • • • • • • • Paper: loose leaf ruled notebook paper, copy paper, graph paper, tracing paper, manila paper, colored paper, poster board and construction paper Pencil boxes and other school supply boxes Pencil sharpeners Pencils Pens Protractors Reference books Reference maps and globes Rulers Scissors Sheet music Sketch and drawing pads Textbooks Watercolors Workbooks; and Writing tablets “School computer supply” is an item commonly used by a student in a course of study in which a computer is used. For purposes of the sales tax holiday, the term “school computer supply” is not included under the term, “school supply.” Any school computer supply is ineligible for exemption during the sales tax holiday. The following is a list of examples that constitute school computer supplies:...

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The best website for IAS exam helps the student to identify the pattern of the paper and helps to command the paper thoroughly.

Modeling Diesel Engine Cylinder Head Gaskets using the ... - edoqs

Modeling Diesel Engine Cylinder Head Gaskets using the Gasket Material Option of the SOLID185 Element Jonathan Raub Cummins, Inc. Abstract The modeling of diesel engine cylinder head gasket joints is complicated by the nonlinear response of the head gasket’s materials. Linearization of these material responses can lead to significant errors in the solution’s results. The 1-dimensional nonlinear approximation made by the Gasket material option of the SOLID185 element sufficiently captures the response of the nonlinear gasket materials while maintaining practical solution times for the large model sizes associated with multi-cylinder head gasket joint models. This paper will give an overview of the model building and assembly process used to create a head gasket joint model, describe the nonlinear nature of the materials used in the model, and present comparisons of the model’s results with experimental measurements. Introduction Previous analyses of cylinder head gasket joints using Ansys employed a process in which the nonlinear responses of the head gasket materials were linearized to allow the use of an elastic modulus (Reference 1). While moderately effective, this process required the material response to be fairly linear over the range of load experienced by the gasket. Also, this technique captured the global response of the joint, but the linear material assumption limited the model’s ability to accurately predict load variation around the gasket, especially in lightly loaded regions....

TSB Leaking Plenum Gasket3 - Amsoil
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Product Description: All AMSOIL Synthetic Motor Oils Subject: Using AMSOIL motor oils in Chrysler engines experiencing spark knock OBJECTIVE: Figure 1. severe case of leaking plenum gasket To inform Chrysler vehicle owners about Chrysler Technical Service Bulletin TSB 09-05-00 (1). The Chrysler Bulletin describes the replacement of the engine intake manifold plenum pan gasket. If the plenum gasket leaks, it may disrupt the performance and service life of the motor oil. ISSUES: Chrysler has indicated in this technical bulletin that certain 3.9 L, 5.2 L, and 5.9 L gasoline engines could develop intake manifold plenum pan gasket leaks. These models are: Years Figure 2. mild case of leaking plenum gasket Models 1994-1999 AB, Ram Van 1994-1999 AN Dakota 1994-1999 BR/BE, Ram Truck 1998-1999 DN, Durango 1994-1998 ZJ, Grand Cherokee 1996-1998 ZG, Grand Cherokee The Chrysler TSB 09-05-00 noted two symptoms of a plenum gasket oil leak: (1) engine spark knock during acceleration (2) increased oil consumption. This oil leak is internal and is not visible from the outside of the engine. Figure 1 is taken from a 1999, 5.2L, V8, Dodge Ram Van, which illustrates a severe case of plenum gasket leak; note the deposits around the gasket. Figure 2 is taken from a 1998, 5.2 L, V8, Dodge Dakota, which illustrates a mild case of plenum gasket leak; note the oil film on the pan. TECHNICAL DISCUSSION: The Chrysler bulletin indicates that when the plenum gasket leaks, engine combustion blow-by gases, oil vapor and air from the crankcase filter/ breather may be drawn past the leaking gasket and into the intake manifold. This may cause engine spark knock during acceleration. Professor M. David Checkel of University of Alberta, Edmonton, Canada has written a paper,...

2012 Impreza WRX/STI 2013 Impreza WRX | STI - 2014 Subaru ...

Impreza WRX | STI WRX/STI Life moves fast. Don’t slow it down with a car you can’t trust. At Subaru, we build each of our vehicles with the highest standards of manufacturing, and with designs that are inherently tough and resilient. It’s why our It’s not disposable. It’s family. vehicles excel in the extreme rigors of rally racing. And why 96% of all the vehicles we’ve built in the last 10 years are still on the road today.1 It’s also why Subaru owners are so likely to stay Subaru owners for years and years. What’s more, keeping cars on the road means they stay out of landfills longer. And if we can make the world a cleaner and greener place while making cars that inspire and motivate their drivers, we’ve done our job. Find out more about our efforts to keep it cleaner and greener. 1  Based on Polk registration data in the U.S. 2002–2011. Love. It’s what makes a Subaru, a Subaru. This brochure is printed in the U.S.A. on 10% recycled paper. ©2012 Subaru of America, Inc.  13.WRX.SRB.525 (S-13482, 87K, 7/12, CG) Subaru Impreza WRX STI Subaru Impreza WRX The edge is just the beginning. We start with an insatiable desire to bring performance to the people. We take it to the limit with the streetscorching Impreza WRX, then push it unbelievably farther with the g-defying WRX STI. Which stirs you?

Panduan penulisan Penerbitan Buku Teks - PDPT

Panduan Penulisan Buku Panduan ini merupakan petunjuk penulisan buku pelajaran (ilmiah populer) yang digunakan untuk menentukan kelayakan naskah bagi penerbit. Panduan ini membahas pengertian buku pelajaran & diktat, tujuan penulisan buku pelajaran, isi buku pelajaran, sampul buku, bagian pembuka, bagian utama dan bagian penutup serta ketentuan jumlah halaman. Buku Pelajaran (Text book) & Diktat Buku pelajaran adalah bahan/materi pelajaran yang dituangkan secara tertulis dalam bentuk buku dan digunakan sebagai bahan pelajaran (sumber informasi) sebuah mata kuliah bagi mahasiswa dan pengajar susuai dengan kebutuhan lapangan/industry dan tuntutan perkembangan teknologi dan atau kurikulum. Diktat adalah catatan tertulis suatu bidang studi yang disiapkan oleh guru/dosen untuk mempermudah pengayaan materi pelajaran atau bidang studi yang dibahas dalam proses pembelajaran (Ilvandri, 2011). Diktat yang baik merupakan draft buku ajar yang belum diterbitkan. Tujuan penulisan buku pelajaran a. Menyediakan buku susuai dengan kebutuhan mahasiswa, institusi dan lapangan/ industry serta serta tuntutan perkembangan teknologi atau kurikulum. b. Mendorong penulis/dosen untuk berkreasi dan kreatif membagikan ilmunya kepada masyarakat. c. Mendorong penulis untuk meng-update ilmunya sesuai dengan kriteria tuntutan buku layak terbit mencakup subdstansi, bahasa dan potensi pasar. d. Mendukung penulis untuk menerbitkan buku bila belum terbit. Isi Buku Pelajaran Isi buku pelajaran berupa teori, konsep, formula atau aturan terkini dilengkapi dengan contoh-contoh masalah atau studi kasus serta solusinya. Isi buku harus orsinil dengan merujuk dari berbagai sumber. Informasi tepat, dapat dipercaya dan dipertanggungjawabkan kepada pembaca dan semua pihak terkait. Isi tersusun dengan baik atau dengan alur informasi yang mudah dipahami. Buku pelajaran dan diktat yang baik memenuhi tiga aspek pendidikan yaitu ilmu pengetahuan (knowledge), keterampilan (skills) dan sikap atau perilaku (attitude). Aspek tersebut seperti yang dinyatakan oleh UNESCO (1994) yaitu...

Zend Framework in Action -
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Zend Framework in Action Zend Framework in Action ROB ALLEN NICK LO STEVEN BROWN MANNING Greenwich (74° w. long.) For online information and ordering of this and other Manning books, please visit The publisher offers discounts on this book when ordered in quantity. For more information, please contact: Special Sales Department Manning Publications Co. Sound View Court 3B Fax: (609) 877-8256 Greenwick, CT 06830 Email: ©2009 by Manning Publications Co. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by means electronic, mechanical, photocopying, or otherwise, without prior written permission of the publisher. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in the book, and Manning Publications was aware of a trademark claim, the designations have been printed in initial caps or all caps. Recognizing the importance of preserving what has been written, it is Manning’s policy to have the books we publish printed on acid-free paper, and we exert our best efforts to that end. Recognizing also our responsibility to conserve the resources of our planet, Manning books are printed on paper that is at least 15% recycled and processed elemental chlorine-free Manning Publications Co. Sound View Court 3B Greenwich, CT 06830 ...

The Programs for Strength Calculation in Pipelines

This paper draws on ongoing PhD thesis “Piping optimization on the basis of strength condition analysis”. The paper is structured as follows. After an overview of the theoretical issues the paper will provide an overview of the programs analysis for pipeline construction. The paper considers the description of four different programs (START, RAMPA, LV pipe II, CAESAR II) for strength calculation. The programs are analyzed by standard, program developer, technical specs, language, application areas, graphics function, error checker and reports. to choose the configuration of pipeline and, at the same time, to avoid unnecessary pipeline complication. It is necessary to arrange the supports taken into consideration so that they do not reduce pipeline compensating capacity. Strength calculation allows finding correct solution for supports placements, their types and characteristics. Programs characteristic and comparison Requirements to technical calculation of program The main requirements to technical calculation of the program are considered in this part of paper. The program is supposed to calculate: Reactions, forces and moments in supports and connected equipment • Pipeline forces and moments • Displacements • Strength and stress calculations according to standard EVS-EN 13480 • Nozzle loads • Wind loads • Friction • Fatigue The main characteristics of strength calculation programs are given in Table 1....