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ForumsWiki Talk PageReed & Prince vs Phillips
1. REED & PRINCE VS PHILLIPS (13425 views)
By: kenhill
Hi, I'm still not clear as to the difference in application of these 2 screw heads. Can someone please make it a bit clearer for me?
February 13, 2014 at 1:08pm
2. ELON MUSK TO HELP FUND TESLA MUSEUM! (8997 views)
By: johnhoover
Elon Musk, creator of such awesome businesses as PayPal, SpaceX, and Tesla Motors, just announced that he will be helping to build the first ever Tesla Museum! And that is Tesla as in Nikola Tesla, the brilliant inventor responsible for much of our modern society including the wide spread usage of AC power!

The announcement was made via Elon Musk's personnel twitter account after a request for help was made by, among others, the creator of the The Oatmeal, Matthew Inman.

Matthew was a key part of an effort made in 2012 to save Nikola Tesla's laboratory through crowd sourcing. Using funds raised primarily through public donations, they were able to purchase the property in Long Island, NY that the laboratory was located on: http://theoatmeal.com/blog/tesla_museum

While enough money was raised to purchase the land, another $8 million is needed to build the museum itself. Having already crowd sourced the land, Matthew made a direct plea to Elon Musk for him to fund the building of the museum: http://theoatmeal.com/comics/tesla_model_s2

This morning, Elon Musk sent Matthew a message via twitter announcing that he would be, "happy to help"! https://twitter.com/Oatmeal/status/466595838978818048

As if Elon Musk wasn't already someone to be admired, he goes and sets the bar even higher!

Thank you, Elon Musk!

May 14, 2014 at 12:41pm
ForumsCoursesDistribution and WarehousingImportance of Preservation Maintenance during Long Term Material Storage
3. IMPORTANCE OF PRESERVATION MAINTENANCE DURING LONG TERM MATERIAL STORAGE (5785 views)
By: johnhoover
The importance of preservation maintenance during long term material storage can not be stressed enough. The following is an exert from a report created by TTS as part of a Warehouse Preservation Procedure Review.

"Material degradation was found to exist for a significant portion of the parts found in the (client's) warehouse facility. Degradation is due to, almost universally, failure to follow proper preservation procedures as outlined in (client's) global standards. The forms of degradation varied from basic surface contamination to significant degradation of components, likely making them unsuitable for field use."

While the specific cost of the degradation of spare parts is not known at this time, it is estimated to be upward of several million dollars. This is due to the combination of extended outages due to unusable spare parts, more frequent failure of spare parts in use, and spare part replacement costs in the case of the most sever degradation. In almost every case noted during the review, adherence to proper preservation procedures would have prevented deterioration of spare parts materials.
February 4, 2014 at 3:06pm
ForumsWiki Talk PageMarkings on Threaded Fasteners
4. MARKINGS ON THREADED FASTENERS (5351 views)
By: dallashermanson
Many bolts that you come across have various markings on the bolt head, such as alpha numeric characters and/or a number of radial lines. What information can be obtained from these symbols?
February 28, 2014 at 4:25pm
ForumsCoursesCombined CyclePurpose of Intercept Valve
5. PURPOSE OF INTERCEPT VALVE (3882 views)
By: mike.coats
The term Intercept Valve sounds pretty cool....possibly bringing to mind a scene from "Top Gun". However, the purpose of the intercept valve has nothing to do with fighter aircraft.

The intercept valve facilities quick shutdown of a steam turbine on a turbine trip. During a trip, the main stop and control valves immediately go shut. This prevents HP steam from being admitted to the turbine. However, there is still a lot of steam left downstream of the HP turbine in piping as well as the IP and LP sections of the HRSG. The intercept is located downstream of the IP section of the HRSG and upstream of the IP section of the turbine. On a turbine trip, the intercept valve closes, preventing steam already in the system from entering the IP section of the turbine. If this valve were not there, steam would continue to enter the IP section of the turbine, and the rotor would continue to rotate until this steam has been exhausted.
August 3, 2016 at 9:32am
ForumsLearning ActivitesOculus RiftMore applications for Oculus Rift
6. MORE APPLICATIONS FOR OCULUS RIFT (3086 views)
By: eddieng
This is yet another application for the device. Interesting how one device can make such a change.

http://www.theverge.com/2014/8/25/6065669/oculus-rift-helps-man-with-2d-vision-see-3d#ooid=54aDhzbzofoDFvZItNuDF9xh6wt0vO76
August 27, 2014 at 3:57pm
ForumsWiki Talk PagePush Button Stop/Start with Level Switch
7. PUSH BUTTON STOP/START WITH LEVEL SWITCH (3058 views)
By: mark9prairie9
For industrial Wiki "Motor Control-Automatic" How is a push-button station used with automatic level switches for high and low level pump-down?
March 13, 2014 at 12:53pm
ForumsLearning ActivitesOculus RiftMore Oculus Rift Competition
8. MORE OCULUS RIFT COMPETITION (2237 views)
By: eddieng
Here comes another serious contender. I'm interested to see how this product develops and how it compares to the Oculus Rift.

http://www.foxnews.com/tech/2014/10/22/magic-leap-could-be-oculus-rift-killer/
October 24, 2014 at 2:33pm
ForumsCoursesElectrical110v 115v 120v 125v 220v 240v 250v and bears oh my!
9. 110V 115V 120V 125V 220V 240V 250V AND BEARS OH MY! (2186 views)
By: jdorman
I deal with a lot of variations of power in the US all having voltages of 110 or 220. The plug types, outlet types and rated voltages seem to come in random flavors of 110v 115v 120v 125v for 110 and 220v 240v 250v for 220.

Is there a difference in these ratings or is it all just different labels for the same approximately 110v and approximately 220v power inputs?
March 13, 2014 at 10:04am
ForumsITHardwareMaximum number of USB devices supported on a single PC
10. MAXIMUM NUMBER OF USB DEVICES SUPPORTED ON A SINGLE PC (2047 views)
By: jdorman
Ran into an interesting bit of research this weekend on USB devices and HUB's. The USB spec gives 7 bits for device addressing. This means 128 USB addresses are available. The USB Host controller is address 0 which leaves 127 available addresses.

Now things get awkward when you start plugging in more devices than you have USB ports by using USB hubs. It turns out that each Host supports 128 devices and 5 levels of depth. USB is a star topology normally visualized as a tree structure. The HUB is #0 and is the trunk. Each additional HUB is a branch. If you plug in 1 hub and then plug another hub into the first you have added two levels or branches of USB devices.

Further down the line we find that USB hubs contain IC's to control the upstream and downstream ports. IC's which control 4-7 ports are inexpensive and common whereas larger port IC's seem to be much more expensive and rare. This means that a typical 12 port hub will contain 2 x 7 port hubs inside it. So when plugging in a 12 port hub we gain 11 usable ports (12 added -1 used) and we lose 14 usable USB addresses! So the maximum supported USB devices after plugging in a 12 port hub is down to 125 (128 -1 for the host -2 for the hub)

Daisy Chaining or plugging another hub into this first hub in a pattern of efficiency is quite difficult if we refer back to the allowed depth of 5 levels. If you plug another 12 port hub into the second part of the first hub you will effectively be at 4 levels deep already. (ROOT -> 12 port hub -> inner hub on 12 port hub -> second 12 port hub -> inner hub on second 12 port hub) This means if we plug a third hub daisy chained to the second half of the hub will become unusable as it will pass beyond the 5 levels of depth.

There are solutions to overcome all of these issues. Though it is quite rare for someone to need more than 100 USB devices on the same computer!
March 24, 2014 at 11:16am