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217,500 Matching Results

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Effect of Au on the reliability of fine pitch surface mount solder joints (open access)

Effect of Au on the reliability of fine pitch surface mount solder joints

The effect of Au on the reliability of 0.65 mm pitch surface mount solder joints between plastic quad flat packs and Cu-Ni-Au FR-4 printed circuit boards was investigated. Cu-Ni-Au is a desirable printed circuit board finish for multi-chip modules or printed circuit boards that would otherwise require a selective Au finish, for example for edge connectors or wire bondable parts. However, Au is known to embrittle solder when it is present in sufficiently high concentrations, creating a concern that solder joint fatigue life in service will also be adversely affected. This paper reports the results of mechanical shock, mechanical vibration and thermal cycling testing of fine pitch solder joints containing varying amounts of Au. Tests were performed on as-soldered joints and on joints that had been heat-treated to evolve the microstructure toward equilibrium. The tests were designed to accelerate in-service conditions in a typical industrial environment. Under these conditions, the Au concentrations tested did not promote solder joint failures. Microstructural characterization of the distribution and morphology of the Au-, Ni-, and Cu-Sn intermetallics in the joint before and after accelerated testing was also performed. On the basis of these observations it is recommended that the Au concentration in solder joints …
Date: May 1, 1991
Creator: Glazer, J. (Hewlett-Packard Co., Palo Alto, CA (United States)); Kramer, P. & Morris, J.W. Jr. (Lawrence Berkeley Lab., CA (United States))
Object Type: Article
System: The UNT Digital Library
Revised GCFR safety program plan (open access)

Revised GCFR safety program plan

This paper presents a summary of the recently revised gas-cooled fast breeder reactor (GCFR) safety program plan. The activities under this plan are organized to support six lines of protection (LOPs) for protection of the public from postulated GCFR accidents. Each LOP provides an independent, sequential, quantifiable risk barrier between the public and the radiological hazards associated with postulated GCFR accidents. To implement a quantitative risk-based approach in identifying the important technology requirements for each LOP, frequency and consequence-limiting goals are allocated to each. To ensure that all necessary tasks are covered to achieve these goals, the program plan is broken into a work breakdown structure (WBS). Finally, the means by which the plan is being implemented are discussed.
Date: May 1, 1980
Creator: Kelley, A. P.; Boyack, B. E. & Torri, A.
Object Type: Article
System: The UNT Digital Library
Geothermal Reservoir Well Stimulation Program: technology transfer (open access)

Geothermal Reservoir Well Stimulation Program: technology transfer

The following are included: review of available data from previous fracturing stimulation operations, stimulation process variables, fracturing fluid design, hydraulic fracture design, stimulation case histories, and selected bibliography. (MHR)
Date: May 1, 1980
Creator: unknown
Object Type: Report
System: The UNT Digital Library
National Health Insurance Proposals and Their Alternatives (open access)

National Health Insurance Proposals and Their Alternatives

This report discusses legislative proposals for a national heath insurance system and alternatives to a national health insurance plan.
Date: May 5, 1970
Creator: Cavalier, Kathleen
Object Type: Report
System: The UNT Digital Library
Environmental Affairs in the 91st Congress, 1st Session (open access)

Environmental Affairs in the 91st Congress, 1st Session

This report discusses the growth of environmental policy and provides a listing of introduced legislation related to the environment in the 1st Session of the 91st Congress.
Date: May 16, 1970
Creator: Congressional Research Service. Environmental Policy Division
Object Type: Report
System: The UNT Digital Library
Compensation for Victims of Crimes of Violence (open access)

Compensation for Victims of Crimes of Violence

This report details the compensating schemes of victims of comes of violence. It was announced on June 24, 1964, and came into operation on August 1, 1964.
Date: May 31, 1966
Creator: Price, Hugh P.
Object Type: Report
System: The UNT Digital Library
Digest of Selected Agricultural Legislation: 91st Congress (open access)

Digest of Selected Agricultural Legislation: 91st Congress

This report provides a listing of legislation introduced in the 91st Congress related to agriculture.
Date: May 5, 1970
Creator: Sherman, Harvey R.
Object Type: Report
System: The UNT Digital Library
The Seniority System: Pros, Cons, and Suggested Reforms (open access)

The Seniority System: Pros, Cons, and Suggested Reforms

This report discusses the seniority system in Congress used to select committee chairman and efforts to reform the system.
Date: May 27, 1970
Creator: Oleszek, Walter J.
Object Type: Report
System: The UNT Digital Library
Do-It-Yourself Ecology (open access)

Do-It-Yourself Ecology

This report deals with how to develop a good environment.
Date: May 25, 1970
Creator: Environmental Action Inc.
Object Type: Report
System: The UNT Digital Library
The Nixon Doctrine for Asia (open access)

The Nixon Doctrine for Asia

This report provides an overview of the Nixon Doctrine for Asia (written in July 1969) and a discussion of its policies regarding communism in Asia and the Vietnam War.
Date: May 11, 1970
Creator: Niksch, Larry A.
Object Type: Report
System: The UNT Digital Library
Powers of the President (open access)

Powers of the President

This report is about the powers of the President.
Date: May 6, 1969
Creator: Tansill, William R.
Object Type: Report
System: The UNT Digital Library
Developments in Cambodia Following the March 18 Coup (open access)

Developments in Cambodia Following the March 18 Coup

This report discusses the March 18, 1970 coup in Cambodia by General Lon Nol which overthrew the government of Prince Norodom Sihanouk and subsequent fighting in Cambodia between Communist North Vietnamese troops and South Vietnamese troops which led to American intervention in the form of an attack on North Vietnamese bases in Cambodia in April and May of 1970.
Date: May 11, 1970
Creator: Niksch, Larry A.
Object Type: Report
System: The UNT Digital Library
Powers Of The President (open access)

Powers Of The President

This report consists of the powers of president.
Date: May 6, 1969
Creator: Tansill, William R.
Object Type: Report
System: The UNT Digital Library
[Dee Knight talking with Colleague at Conference]

[Dee Knight talking with Colleague at Conference]

Photograph of Dee Knight, Associate Professor & Associate Dean for the College of Merchandising, Hospitality and Tourism at UNT. Knight is seen talking with her fellow colleagues and visitors from other Universities at the Open Access Symposium.
Date: 2016-05-19/2016-05-20
Creator: Clark, Junebug
Object Type: Photograph
System: The UNT Digital Library
[Graduates at commencement ceremony]

[Graduates at commencement ceremony]

Photograph of graduates at their commencement ceremony. In the foreground a girl holds up a peace sign when her photograph was taken, her and the row of graduates are walking towards the stage to receive their diplomas. The students belong to Mayborn School of Journalism as identified by the red medals and hoods around their neck and shoulders. Taken during the Mayborn Doctoral and Master’s Commencement, Spring 2017.
Date: May 2017
Creator: Clark, Junebug
Object Type: Photograph
System: The UNT Digital Library
[Dan Morgan Speaking at the Open Access Symposium]

[Dan Morgan Speaking at the Open Access Symposium]

Photograph of Dan Morgan, Digital Science Publisher at the University of California Press, speaking at the Open Access Symposium hosted and held at UNT's Union Building. The theme of the conference is Open Access at the Tipping Point. The power point projector behind Morgan reads, "Live-streaming OA at University of California Press: lessons learned, and how the landscape has already changed."
Date: 2016-05-19/2016-05-20
Creator: Clark, Junebug
Object Type: Photograph
System: The UNT Digital Library
[J.E.C.V. (Johan) Rooryck Giving Lecture at Conference]

[J.E.C.V. (Johan) Rooryck Giving Lecture at Conference]

Photograph of J.E.C.V. (Johan) Rooryck, Professor of French Linguistics at the Leiden University Centre, giving a lecture at the Open Access Conference hosted and held in UNT's Union Building. The projection behind Rooryck reads, "Fair Open Access A Roadmap."
Date: 2016-05-19/2016-05-20
Creator: Clark, Junebug
Object Type: Photograph
System: The UNT Digital Library
[Mayborn School of Journalism Ambassadors]

[Mayborn School of Journalism Ambassadors]

Photograph of the Mayborn School of Journalism Ambassadors standing together for a group picture. The Mayborn Ambassador Program is a peer mentorship and prospective student outreach program.
Date: May 5, 2017
Creator: Clark, Junebug
Object Type: Photograph
System: The UNT Digital Library
[Portrait of Brooke Parent]

[Portrait of Brooke Parent]

Portrait of Brooke Parent, photographed for the Mayborn School of Journalism Ambassadors. The Mayborn Ambassador Program is a peer mentorship and prospective student outreach program.
Date: May 5, 2017
Creator: Clark, Junebug
Object Type: Photograph
System: The UNT Digital Library
[The Little Graduate]

[The Little Graduate]

Photograph of a graduation cap that has been decorated it reads, "The Little Gradaute." It features the little mermaid wearing a graduation cap with green flowers decorated along the mortarboard. The graduation cap belongs to a graduate taken during the Mayborn Doctoral and Master’s Commencement, Spring 2017.
Date: May 2017
Creator: Clark, Junebug
Object Type: Photograph
System: The UNT Digital Library
[Portrait of Dan Morgan]

[Portrait of Dan Morgan]

Photograph of Dan Morgan, Digital Science Publisher at the University of California Press, attending the Open Access Symposium, the theme of the conference is Open Access at the Tipping Point. The conference was held at the University's Union building.
Date: 2016-05-19/2016-05-20
Creator: Clark, Junebug
Object Type: Photograph
System: The UNT Digital Library
[Kevin Hakwins Introducing Keynote Speaker]

[Kevin Hakwins Introducing Keynote Speaker]

Photograph of Kevin Hawkins, Assistant Dean for Scholarly Communication at UNT's University Libraries. Hawkins is introducing Brian Nosek, at the Open Access Symposium hosted and held in UNT's Union Building. The projection behind Hawkins reads, "Improving Openness of Scholarly Communication. Brian Nosek"
Date: 2016-05-19/2016-05-20
Creator: Clark, Junebug
Object Type: Photograph
System: The UNT Digital Library
[Videographer Jeff Merril]

[Videographer Jeff Merril]

Photograph of Jeff Merrill, a Video and Audio Assistant at UNT Clear. Merrill is attending and recording the events of the Open Access Symposium, hosted and held in UNT's Union Building. Merrill is seen holding the video camera and listening to the audio feedback through headphones.
Date: 2016-05-19/2016-05-20
Creator: Clark, Junebug
Object Type: Photograph
System: The UNT Digital Library
[Kevin Hawkins and Martin Halbert]

[Kevin Hawkins and Martin Halbert]

Photograph of Kevin Hawkins, (left) Assistant Dean for Scholarly Communication at UNT's University Libraries, and Martin Halbert, (right) Dean of Libraries at the University of North Texas, looking over some papers together. Hawkins and Halbert are attending the Open Access Symposium hosted at UNT Union building.
Date: 2016-05-19/2016-05-20
Creator: Clark, Junebug
Object Type: Photograph
System: The UNT Digital Library