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Articles 1231 - 1260 of 1260

Full-Text Articles in Engineering

Predicting The Future Fate Of Pcbs In Lake Hartwell, Alan W. Elzerman, Kevin J. Farley, Frank M. Dunnivant, Craig Cooper Oct 1994

Predicting The Future Fate Of Pcbs In Lake Hartwell, Alan W. Elzerman, Kevin J. Farley, Frank M. Dunnivant, Craig Cooper

Publications

No abstract provided.

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Running With The Pack: Jit & Automation For Small Manufacturers, Thomas E. Phillips, John R. Ledgerwood Jun 1994

Running With The Pack: Jit & Automation For Small Manufacturers, Thomas E. Phillips, John R. Ledgerwood

Publications

While both just in time (JIT) concepts and automation programs have been widely implemented and highly successful in large manufacturing companies, many smaller manufacturing companies have wondered whether it would be economically feasible to utilize these same techniques and derive these same benefits. When JIT is adopted by small manufacturers, it provides them with advantages over traditional manufacturing systems, such as lower cost, quality improvements, higher productivity, and less working capital tied up in inventory. Small US manufacturers must understand the basic principles and philosophy of JIT and update their production equipment if they are to be competitive in today's …

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Upon Closer Inspection...U.S. Naval Aviation Mishaps 1977-1992, Scott A. Shappell, Douglas A. Wiegmann Apr 1994

Upon Closer Inspection...U.S. Naval Aviation Mishaps 1977-1992, Scott A. Shappell, Douglas A. Wiegmann

Publications

The U.S. Navy/Marine Corps Class A flight/flight-related mishap rate has declined markedly since 1953. However, analysis of all Class A, B, and C naval aviation mishaps between January 1977 and December 1992 reveals that mishaps attributable to human factors have declined at a slower rate than those attributable to mechanical/environmental factors. Upon closer inspection of the data, marked differences were evident between single-piloted and dual-piloted aircraft. Global trends were primarily a function of single-piloted aircraft, particularly when phase of flight and time of day that a mishap occurred are considered. Previously reported improvement in aviation safety may be biased by …

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The Effects Of Luminance Boundaries On Color Perception, Richard E. Kronauer, Charles F. Stromeyer Iii, Alex Chaparro Jul 1993

The Effects Of Luminance Boundaries On Color Perception, Richard E. Kronauer, Charles F. Stromeyer Iii, Alex Chaparro

Publications

The luminance and red-green chromatic detection mechanisms respond to, respectively, the sum and difference of the long-wave (L) and middle-wave (M) zone contrast signals. The most-detectable stimulus is not a small patch of luminance drifting grating, as suggested by others, but rather a small, foveal red-green chromatic flash. Even at the smallest test size examined, 2.3' diameter, the red-green mechanism i~s more sensitive than the luminance mechanism, which has profound implication for visual physiology. When a suprathreshold luminance flash (a pedestal) occurs coincidentally with a red-green chromatic flash, detection of color is facilitated ~2-fold, regardless of spot size, as shown …

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Pcbs And Related Compounds In Lake Hartwell, Alan W. Elzerman, Frank M. Dunnivant, Geoffrey G. Germann Mar 1991

Pcbs And Related Compounds In Lake Hartwell, Alan W. Elzerman, Frank M. Dunnivant, Geoffrey G. Germann

Publications

No abstract provided.

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Aerodynamic Forces On Flight Crew Helmets, Timothy A. Sestak, Richard M. Howard, Chester A. Heard Sep 1989

Aerodynamic Forces On Flight Crew Helmets, Timothy A. Sestak, Richard M. Howard, Chester A. Heard

Publications

Wind tunnel tests were conducted to deter- mine the aerodynamic forces generated on aircrew flight helmets. Three helmets were tested: two used by aircrews flying ejection seat aircraft in the U.S. military, the Navy HGU-33/P and the Air Force HGU-53/P; and one prototype helmet of significantly different shape and volume. Axial and normal forces were measured through a range of pitch and yaw angles. It was found that large forces exist tending to promote helmet loss during ejection, and that simple modifications to the current helmet configurations can reduce those forces by as much as 40%. It is demonstrated that …

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The Development Of Speech Research Tools On Mit's Lisp Machine-Based Workstations, D. Scott Cyphers, Robert H. Kassel, David H. Kaufman, Hong C. Leung, Mark A. Randolph, Stephanie Seneff, John E. Unverferth Iii, Timothy Wilson, Victor W. Zue Jan 1986

The Development Of Speech Research Tools On Mit's Lisp Machine-Based Workstations, D. Scott Cyphers, Robert H. Kassel, David H. Kaufman, Hong C. Leung, Mark A. Randolph, Stephanie Seneff, John E. Unverferth Iii, Timothy Wilson, Victor W. Zue

Publications

In recent years, a number of useful speech- and language-related research tools have been under development at MIT. These tools are aids for efficiently analyzing the acoustic characteristics of speech and the phonological properties of a language. They are playing a valuable role in our own research, as well as in research conducted elsewhere. This paper describes several of the systems being developed for use on our Lisp Machine workstations.

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What Is An Airlifter?, Tim Brady Aug 1973

What Is An Airlifter?, Tim Brady

Publications

This article describes the components that make up the Tactical Air Command flight crew, from loadmaster, to flight engineer, to navigator, to copilot, and lastly, to pilot. All together, the crew work in coordination to deliver the goods or the troops. This article was Dr. Brady's last as editor of TAC Attack. Under his two-year leadership, the safety message continued to be heard.

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Between Pyosis And Pyralidan, Tim Brady Jul 1973

Between Pyosis And Pyralidan, Tim Brady

Publications

Some history of the military air base, Pyote (Texas), and its mission after World War II to store and preserve surplus military aircraft. Two famous airplanes were stored there: the Enola Gay, the B-29 used to drop the first atomic bomb on Hiroshima, and the Swoose, the sole surviving B-17D from the Pacific theater during World War II. Both aircraft are now housed at the Smithsonian.

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The Spin--An Accident Analysis, Tim Brady Jun 1973

The Spin--An Accident Analysis, Tim Brady

Publications

An analysis of an accident involving a C-130 Hercules is described. C-130s do spin and the outcome is normally fatal to aircrew members.

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The Alligators Will Get You, If You Don't Watch Out!, Tim Brady Apr 1973

The Alligators Will Get You, If You Don't Watch Out!, Tim Brady

Publications

This article relates which tools can help pilots prepare to land at unknown airports.

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Wheels Are Square, Tim Brady Mar 1973

Wheels Are Square, Tim Brady

Publications

This article discusses the possibilities to extend battlefield support using aircraft equipped with air cushion landing systems (ACLS). The ACLS are less costly than traditional landing systems but provide some new flying skills, like how to move the aircraft after the air cushion has been deflated.

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Gear-Up Landings, Or...Let It All Hang Out, Tim Brady Feb 1973

Gear-Up Landings, Or...Let It All Hang Out, Tim Brady

Publications

Gear-up landings, or belly landings, continue to plague civilian, military and commercial aviation. A study has begun on a new effective device to warn pilots if the landing gear is not deployed correctly before landing.

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The Four Horsemen, Tim Brady Jan 1973

The Four Horsemen, Tim Brady

Publications

From 1956 until 1960, the Air Force's Tactical Air Command (TAC) fielded a team of four C-130 Hercules pilots to perform as an aerial demonstration team. The shows thrilled audiences around the United States and the pilots, known as the Four Horsemen, showed the power and maneuverability of the huge airlifters also known as troop carriers. The aircraft used in the demonstrations were taken from the inventory of whatever air base was closest to the show.

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On A Wing And A Strap, Tim Brady Jan 1973

On A Wing And A Strap, Tim Brady

Publications

In 1958, as part of Operation Jingle Bells, a Hercules C-130, ferrying cargo and personnel to the United States from the Far East, encountered weather and abbreviated their flight into Langley. Little Rock Air Force Base was chosen as the alternative landing site. Getting the C-130 down onto the ground proved to be challenging when the controls for the trim system did not operate correctly. Through sweat and ingenuity, the crew got the bird landed and the personnel in the back applauded their efforts. The personnel and cargo were used as ballast to change the center of gravity. After that …

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The Airlift Instructor School, Tim Brady Nov 1972

The Airlift Instructor School, Tim Brady

Publications

The development of the Airlift Instructor School at Little Rock AFB, Arkansas, is discussed. This article details the school's philosophy, programs and courses. Standardization in training means a better safety posture.

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World War I And Beyond, Tim Brady Sep 1972

World War I And Beyond, Tim Brady

Publications

Traces the beginnings of military aircraft in the United States, from the Wright Brothers in 1907 to the expansion of the U.S. Air Corps in 1938.

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The 'Can Do' Attitude, Tim Brady Aug 1972

The 'Can Do' Attitude, Tim Brady

Publications

Having the Can Do Attitude is essential to be efficient. If one is efficient, then one is thinking of safety, which is the goal of the U.S. Air Force Tactical Air Command.

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Talar: What Is It?, Tim Brady Jul 1972

Talar: What Is It?, Tim Brady

Publications

A discussion of the origin of TALAR (Tactical Landing and Approach Radar) and its uses. Also known as Tactical Precision Approach System.

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Call Signs, Tim Brady Jun 1972

Call Signs, Tim Brady

Publications

A discussion about the origin of voice call signs and aircraft call signs.

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The Longest Flight, Tim Brady May 1972

The Longest Flight, Tim Brady

Publications

Recounts the last leg of a ferry mission in a C-7 from Southeast Asia to Okinawa where the aircraft experienced serious malfunctions. Rescue accomplished just short of destination with very minor injuries to flight crew after ditching.

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The C-130 Fin Stall Phenomenon, Tim Brady Apr 1972

The C-130 Fin Stall Phenomenon, Tim Brady

Publications

The C-130 Hercules airplane is known for its idiosyncrasies related to the large sideslip angles. Precise pilot reactions are needed to control the ship when this situation arises.

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Bio What?, Tim Brady Mar 1972

Bio What?, Tim Brady

Publications

A study is made of biorhythm charts and aircraft accidents at TAC. In one 3-year span, 1969-1972, covering 59 accidents, 13 of those accidents occurred on a "critical biorhythmic day" and 40% of the total accidents happened when at least one of the pilots involved had two or more biorhythmic cycles in the minus portion. All accidents are preventable and all people are accident preventers. Understanding why accidents happen and that they are sometimes caused by human error is one area that needs continued study to determine how to reduce accidents.

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Another Look At Hydroplaning, Tim Brady Feb 1972

Another Look At Hydroplaning, Tim Brady

Publications

This article examines the factors contributing to the hydroplaning of aircraft tires on airport runways: ground speed, tire pressure, and water depth vs. tire tread depth. Aircraft weight does not bear any affect on aircraft tire hydroplaning.

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The Professionals, Tim Brady Jan 1972

The Professionals, Tim Brady

Publications

The professional pilot is able to handle many critical situations with calmness, split-second decision-making skills, and knowledge of aircraft capabilities, all the while depending on team support.

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The Lure Of Home, Tim Brady Dec 1971

The Lure Of Home, Tim Brady

Publications

This article recounts an aircraft accident that could have been avoided. The pilot ignored flight manual warnings to not fly in icing conditions. The pilot disregarded all advice to stay on the ground but he was anxious to get home and celebrate an occasion with his family. All lives lost on the flight.

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Holidays From Danger, Tim Brady Nov 1971

Holidays From Danger, Tim Brady

Publications

A reminder to be safe during holidays to prevent fires, avoid personal injury, and stay off the roads after drinking.

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On Target, Tim Brady Oct 1971

On Target, Tim Brady

Publications

An examination of aircraft accidents in the military while training for weapons delivery maneuvers.

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Midair! Midair!, Tim Brady Sep 1971

Midair! Midair!, Tim Brady

Publications

A review of a midair collision involving a civilian aircraft and a military aircraft. Careful adherence to the see and avoid principle is advised for all aircraft.

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How About A System?, Tim Brady Feb 1971

How About A System?, Tim Brady

Publications

A checklist for air safety is discussed. A lengthy process, but necessary for air safety.

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