ARTICLES

7/14/2009· Human Factors

Reaction Time

By: Kristopher J. Seluga, PE

When a person becomes aware of a dangerous situation, a time-interval must elapse before he can take defensive action against it. This time interval, commonly called the reaction time, has been found to be about 0.7 second for all normal persons, regardless of their background and training. This suggests that the reaction time depends on some basic aspect of the human physiology-involving the brain, nervous system, and muscles-which does not vary much from person to person.

7/14/2009· Accident Investigation & Reconstruction

Lawnmower Accidents

By: Kristopher J. Seluga, PE

There are approximately 180,000 lawnmower accidents per year. In this introductory presentation, we undertake to describe the various ways in which these accidents occur.

7/7/2009· Failure Analysis

Failure Analysis of a Broken Jam Jar

By: Dr. Thomas Read

Glass fractography is the most effective method for determining why a glass object, such as a bottle, failed. This technique consists of examining the fracture surfaces of the failure for artifacts such as Wallner lines and using them to trace the crack back to its origin. Once the origin has been identified, it can be examined in detail with a microscope to determine the cause of the failure.

7/7/2009· Failure Analysis

Failure Analysis of a Failed Ceramic Water Holding Tank on a Toilet

By: Dr. Thomas Read

The cracked tank was first inspected in the "as received" condition. In this condition it was cracked, but it was still whole. Next, the failed tank was separated by pulling it apart. This was done to expose the fracture surfaces of the main crack. This allowed for a complete failure analysis and for a determination of where the crack initiated.

7/7/2009· Design

White Paper: Reverse Engineering

By: Dr. Thomas Read

Before expending the effort necessary to reverse engineer a device or object, it must be definite that the object under study is not covered by one or more patents. This avoids a dispute over patent violations. Once it has been established that no patent coverage exists, one can use multiple techniques to reverse engineer a product. These are summarized below:

6/24/2009· Psychology

Rich Weinfeld Enabling or Empowering? Adaptations and Accommodations for Twice-Exceptional Students

By: Rich Weinfeld

This article addresses the different perceptions that parents, students, and teachers have regarding appropriate accommodations for twice-exceptional students.

6/24/2009· Family Issues

A Break in Communication: When an Advocate Is Needed

By: Rich Weinfeld

Each and every child is born with potential. The adults in that child’s world must work to make certain that there are educational opportunities in place to ensure that potential is reached. Every time an adult acts to support a child’s potential or speak on his or her behalf, we are striving to act as an advocate. In some instances, parents will use traditional venues, such as

6/24/2009· Child Welfare

What We Have Learned: Experiences in Providing Adaptations and Accomodations for Gifted and Talented Students With Learning Disabilities

By: Rich Weinfeld

Would you allow a person to use a wheelchair? Would you carry him or her? If using a wheelchair gives someone an unfair advantage in a race, should his or her time count the same as that of other runners? Would you allow a person to wear glasses for reading a test, even if they only help a little? What about glasses that are so strong that they give the person an ability to read faster than average? Would you allow a person to use a word processor if you knew that the person had a severe writing disability but had ideas that showed evidence of giftedness? Would you allow dictation for a gifted student who had a severe writing disability?

6/19/2009· Warnings & Labels

Samples of Effective Product Warnings

By: Dr. Gerald Goldhaber

The Goldhaber Warnings Report: In the last issue of this newsletter, I listed the major components found in most warnings along with making several suggestions that should help improve a warning’s conspicuousness and make it more likely to gain the attention of the product’s user at the time of use. The following is an example of a warning that

6/19/2009· Securities

Midnight Oil Burners

By: Robert Erwin Ross

I had a call last week on Friday, from the search firm, seeking to potentially fill a recent query for an Expert Witness. Reporting that I’m available for a phone interview was the next step. With that in mind, I could expect a call from a law firm partner, who would be asking