Transient upsets in microprocessor controllers

The modeling and analysis of transient faults in microprocessor based controllers are discussed. Such controllers typically consist of a microprocessor, read only memory storing and application program, random access memory for data storage, and input/output devices for external communications. The effects of transient faults on the performance of the controller are reviewed. An instruction level perspective of performance is taken which is the basis of a useful high level program state description of the microprocessor controller. A transition matrix is defined which determines the controller's response to transient fault arrivals

Laparoscopic repair of a large interstitially incarcerated inguinal hernia.

A 68 year old female presented for elective repair of an abdominal wall hernia. Preoperative CT imaging revealed a right inguinal hernia defect with hernia contents coursing cephalad between the external and internal abdominal oblique muscles. This was consistent with an interstitial inguinal hernia, a rare entity outside of post- traumatic hernias. At operation the hernia contents were reduced laparoscopically. The hernia was then repaired by transitioning to the totally extraperitoneal (TEP) approach using a 15cm X 15cm piece of polyester mesh. The patient had an uneventful recovery. Interstitial hernias are rare, difficult to diagnose and potentially dangerous if left untreated. There is no consensus on the ideal repair of these unique hernias. This represents a minimally invasive repair of an unusual hernia, with a novel approach to diagnose and manage the hernia and its redundant sac

Constructivist Grounded Theory?

The author refers to and use as scholarly inspiration Charmaz's excellent article on constructivist grounded theory as a tool of getting to the fundamental issues on why grounded theory is not constructivist. The author shows that constructivist data, if it exists at all, is a very very small part of the data that grounded theory uses.' (author's abstract)

Constructivist Grounded Theory?

The author refers to and use as scholarly inspiration Charmaz's excellent article on constructivist grounded theory as a tool of getting to the fundamental issues on why grounded theory is not constructivist. The author shows that constructivist data, if it exists at all, is a very very small part of the data that grounded theory uses.' (author's abstract)

The relationship between cognitive moral development and attitudes toward cheating among preservice and in-service high school teachers

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Naturalist Inquiry and Grounded Theory

'The world of Qualitative Data Analysis (QDA) methodology became quite taken with Lincoln and Guba's book 'Naturalist Inquiry' (1985). The author has no issue with it with respect to its application to QDA; it helped clarify and advance so many QDA issues. However, its application to Grounded Theory (GT) has been a major block on GT, as originated, by its cooptation and corruption hence remodeling of GT by default. Lincoln and Guba have simply assumed GT is just another QDA method, which it is not. In 'The Grounded Theory Perspective II' (Glaser 2003, Chapter 9 on credibility), the author has discussed 'Naturalist Inquiry' (NI) thought regarding how Lincoln and Guba's notion of 'trustworthy' data (or worrisome data orientation) and how their view of constant comparison can and has remodeled and eroded GT. In this paper the author will consider other aspects of NI that remodel GT.' (author's abstract)

Remodeling Grounded Theory

'This paper outlines the concerns of the author with Qualitative Data Analysis' (QDA) numerous remodelings of Grounded Theory (GT) and the subsequent eroding impact. He cites several examples of the erosion and summarize essential elements of classic GT methodology. It is hoped that the article will clarify his concerns with the continuing enthusiasm but misunderstood embrace of GT by QDA methodologists and serve as a preliminary guide to novice researchers who wish to explore the fundamental principles of GT.' (author's abstract)

Acoustic and aerodynamic performance of a variable-pitch 1.83-meter-(6-ft) diameter 1.20-pressure-ratio fan stage (QF-9)

Far field noise data and related aerodynamic performance are presented for a variable pitch fan stage having characteristics suitable for low noise, STOL engine application. However, no acoustic suppression material was used in the flow passages. The fan was externally driven by an electric motor. Tests were made at several forward thrust rotor blade pitch angles and one for reverse thrust. Fan speed was varied from 60 to 120 percent of takeoff (design) speed, and exhaust nozzles having areas 92 to 105 percent of design were tested. The fan noise level was at a minimum at the design rotor blade pitch angles of 64 deg for takeoff thrust and at 57 deg for approach (50 percent takeoff thrust). Perceived noise along a 152.4-m sideline reached 100.1 PNdb for the takeoff (design) configuration for a stage pressure ratio of 1.17 and thrust of 57,600 N. For reverse thrust the PNL values were 4 to 5 PNdb above the takeoff values at comparable fan speeds

Low flight speed acoustic results for a supersonic inlet with auxiliary inlet doors

A model supersonic inlet with auxiliary inlet doors and bounday layer bleeds was acoustically tested in simulated low speed flight up to Mach 0.2 in the NASA Lewis 9x15 Anechoic Wind Tunnel and statically in the NASA Lewis Anechoic Chamber. A JT8D refan model was used as the noise source. Data were also taken for a CTOL inlet and for an annular inlet with simulated centerbody support struts. Inlet operation with open auxiliary doors increased the blade passage tone by about 10 dB relative to the closed door configuration although noise radiation was primarily through the main inlet rather than the doors. Numerous strong spikes in the noise spectra were associated with the bleed system, and were strongly affected by the centerbody location. The supersonic inlet appeared to suppress multiple pure tone (MPT) generation at the fan source. Inlet length and the presence of support struts were shown not to cause this MPT suppression