REPOST: A Closer Look: Diesel exhaust fluid

What is diesel exhaust fluid? Sean Randall of Overdrive Magazine delves into this aqueous solution and the chemistry behind it.

Image source: Overdrive.com

With the advent of 2010 engine technology came urea-based diesel exhaust fluid. It’s now standard on all North American engines except those made by Navistar, which announced in July it also would begin using the aftertreatment in 2013. While it performs a sophisticated task – turning harmful emissions into water and nitrogen, the basis of the selective catalytic reduction system – DEF itself is a simple blend of urea and water.


DEIONIZED WATER
The water in DEF needs to be deionized and demineralized because the SCR system is sensitive to minerals and impurities. Using tap water would potentially cause corrosion or even a breakdown.


UREA
Urea is a major component in urine, but it’s produced synthetically for a variety of uses. More than 90 percent of manufactured urea is used as a nitrogen-release fertilizer. Other uses include the explosive urea nitrate, a replacement for rock salt in de-icing roads and a cloud seeding agent. It’s also found in many consumer products: a flavor enhancement for cigarettes, and an ingredient in dish soap, teeth whitening products, skin creams, moisturizers and hair conditioners.


There is much more to learn about the trucking industry. To catch up on the latest developments in the field, follow this Twitter page for Thomas Pecora, president of H&H Transportation.

Preventing subway deaths through laser sensors

Pushed on the subway track, this man is about to die, read the December 4, 2012 edition of The New York Post. The controversial cover photo of the newspaper, more than the news itself, sparked outrage from readers and Internet users. The tragedy that befell 58-year-old Ki Suk Han of Queens, New York, continues to percolate as a hate crime involving a Black and an Asian man. The latter had been crushed ‘like a rag doll’ by the train, according to a witness.

Image source: nypost.com

The death of Ki Suk Han is among the many subway deaths which the Metropolitan Transportation Authority (MTA) is hoping to prevent in the future by rigging subway platforms with intrusion technology. The technology uses laser sensors connected to an alarm system, flashing lights, or anything that will trigger alert in case someone steps or has fallen onto the tracks.

Image source: nytimes.com

MTA officials are considering how the technology could be used in a more efficient yet cost-effective manner. The officials said that the laser sensors are a more viable option than platform screen doors which are complicated to install because subway trains come in different sizes, and some units have curved and tapered platforms. Regardless, MTA is open for other methods to improve security and safety in subway trains.

Image source: huffingtonpost.com

While the agency is yet to roll out a pilot test for laser sensors, it appeals on passengers to cooperate on its effort. At the core of its project is to stimulate a change in customer behaviour by strengthening public awareness. The agency carries out its agenda by handing out pamphlets and other advertising paraphernalia, and putting up help desks in each station so that passengers can report emergencies and ask for help.

Thomas Pecora of NJ-based H&H Transportation Inc. is among the many who encourage the public to participate in every effort meant to ensure transport security and efficient urban mobility. Know the latest in transportation by visiting this Facebook page.