Cockroaches

Maybe not a question for engineers but there seem to be so many people here that know something about everything I though i would give it a shot.

I am faced with trying to cleanse a 3 story 27 unit apartment building of cockroaches and bed bugs. The decision has to be made on a "most cost effec

Carmakers to Back Black Box Recorders

From detnews.com - Autos Insider:

Detroit's Big Three automakers and Toyota Motor Corp. will endorse mandatory event data recorders and brake override systems on all new vehicles. Dave McCurdy, president and CEO of the Alliance of Automobile Manufacturers, the trade group repres

Shrink Fits

I need to create an interference fit between a Ø.7500-7505 shaft consisting of alum 6061 t-6511 and a Ø.7495-.7500 journel consisting of 17-4 stainless. In freezing the 6061 t-6511 how much shrinkage will occur and will it be enough to where i wont have to heat the 17-4 journal?

Flexible Joints

dear problem solvers.

please explain for 10 ton outdoor air cooled 400 volts package unit is it necessary that the suction and return ducts must be connected with Flexible joints to the package unit suction and return openings.if answer is yes than what is the reason for this.Thanks

COE

Somebody sent me a question about extraction of sulphur from a material that is black and ressemble to coal.

I have seach the web to find the right defenition for the word " COE ", but did not find it.

Is someone can help me?

Even the person, living in Connecticut who asked me the que

Gear Pump Lubrication

Can a Internal gear pump be lubricated by the pumped fluid? I know about an external gear pump can be selected in accordance with the bearing feature (internal or external) depends on the fluid type, but this criterium is also applicable to internal gear pumps?

I hope you may help me

Will Blockbuster Remain Lackluster?

Blockbuster is a movie and video game rental chain with over 9,000 stores worldwide. The first store opened in Dallas, Texas in 1985. Blockbuster's business model was based on buying a movie for a large, flat fee and then renting the movie over and over again. Blockbuster's large selection of

Herschel Reveals the Hidden Side of Star Birth

From EurekAlert! - Breaking News:

The first scientific results from ESA's Herschel infrared space observatory are revealing previously hidden details of star formation. New images show thousands of distant galaxies furiously building stars and beautiful star-forming clouds draped a

Cummins N14 Injector Problem

I have 2001 cummins n14 435+ hp engine. I got an engine tune up done about 4 months back. Now I got one injector dead about a week ago. And after it was fixed after a day another one is gone. Is it to do with bad tune up? or bad workmanship? fuel? I am just trying to figure out the reason.

Linear Motors

Can anybody help me about designing a linear motor with maxwell v.10?

Or is there anybody who design a linear motor?Need help!!

NFPA 70E

I have a generator room and was wanting to set the Instantenous portion very high or not at all to coordinate better with my downstream devices and the alternative to that is very high arcflash. So here is my thought I tie the door contacts and motion sensor for the room into the instantenous porti

Conveyor Zero Speed Switch

In conveyor system using ZSS in tail pulley for detecting low spped when low spped occurs(problem in belt, belt cut) it sence the low signal and gives to PLC, PLC trip the conveyor. We using KANA ZSS relay sensor.

I want to know a proper interlock in PLC by logic. Presently no interlock in our

PTFE FLUOROGOLD – Joining sheets

Hello, I'm a Mechanical Engineer from Australia. I am involved in a project that requires the use of a very large PTFE slide plate, basically a large pipe support with stainless steel plate welded to the pipe support and slides on PTFE. The support is exposed to sun light, dusty dry conditions and v

Barbie as Engineer?

Talk about gender egalitarianism: here's a Barbie doll, that 50-year old cultural icon that has manifested herself in more than 100 versions, now to appear (autumn, 2010) as an engineer. Reasonably liberated males who don't dwell on gender stereotypes will no doubt welcome this addition to the colle

Call for Cosmic Cleanup

The increasing volume of man-made junk floating above Earth poses hazards for manned missions and satellite systems alike. The collision of two satellites in 2009 alone produced about 1,500 fragments larger than 10 cm. Technologies to monitor and predict trajectories of more than one million pieces