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General Discussion

14857 threads, 273070 comments (15 Viewing)

12/09/2016 by carolturner
The use of NitroBuild Plus is actually due to It helps in burning all the unwanted fat faster from the body. The need to have any additional wisdom of...
Views: 2, Comments: 0

Global Warming: The Third Viewpoint

12/09/2016 by Usbport
In general, the discussion of 'Global Warming' or 'Climate Change' is usually presented as an argument between two extreme camps where neither side ev...
Views: 92, Comments: 7
Last comment 12/09/2016 by SolarEagle

Sifting Through the Wreckage of Cold Fusion

12/08/2016 by Bayes
Came across this interesting article on Scientific American regarding the possible explanation for what was misinterpreted as Cold Fusion in the late...
Views: 174, Comments: 9
Last comment 12/09/2016 by jdretired

Torus Box Woodworking Project

12/07/2016 by BestInShow
This intrigued me, so I thought I'd post it for the talented woodworkers out in CR4 Land.
Views: 288, Comments: 27
Last comment 12/09/2016 by lyn
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Commercial Space

1958 threads, 3721 comments (1 Viewing)

New Method of Oil Production

12/06/2016 by eugenia.pirogova
Hi all. I found an interesting webinar about the increase of oil production: What do you think? Is it real?
Views: 54, Comments: 2
Last comment 12/06/2016 by SolarEagle

Electrical Design Engineer

11/30/2016 by Spartan Motors
Hi, Spartan Motors is looking for a Electrical Design Engineer with wire harness and circuit experiences. If you are interested in the position, plea...
Views: 158, Comments: 10
Last comment 12/06/2016 by Phys

AMWEI PTC Thermistor for Overload Over-Current Protection

11/28/2016 by AMWEI Thermistor
Ceramic PTC (positive temperature coefficient) thermistors are used instead of conventional fuses to protect load, such as motors, transformers, or el...
Views: 56, Comments: 0

Jet Rack - Do You Have a Work Truck With Any A-frame Ladder?

11/21/2016 by JE in Chicago
I thought I'd share this nice video about how to install a Jet Rack ladder rack that was created by an end user. Very soon we'll be giving 3 Jet Rack...
Views: 94, Comments: 0
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CR4 Feedback

680 threads, 11915 comments (0 Viewing)
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Section Blogs

Editor's Desk

93 blog entries, 351 comments (0 Viewing)

John Glenn Dies at Age 95

12/08/2016 by wagman262
What thoughts do you have on the passing of John Glenn? Not an engineer, but certainly an iconic figure who rode into space on the accomplishments of...
Views: 71, Comments: 10
Last comment 12/09/2016 by phoenix911

Impact of an EPA Rule Rollback

12/08/2016 by wagman262
Curious for your back-of-the-envelope assessment: Let’s say EPA stops enforcing air and water rules for power plants. Would doing so ease regula...
Views: 117, Comments: 16
Last comment 12/09/2016 by phoenix911
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Abe's Blog

4 blog entries, 45 comments (0 Viewing)

Hypatia of Alexandria – Part 3

11/15/2016 by amichelen
(Note: This is last part of Hypatia of Alexandri) Personal life If we have little knowledge of her scientific achievements, we know even less about...
Views: 250, Comments: 35
Last comment 11/19/2016 by TimONeill

Hypatia of Alexandria – Part 2

11/08/2016 by amichelen
(This is the second part of Hypatia of Alexandria) The ideas developed by the Pythagoreans represent a solid contribution to the scientific knowledge...
Views: 159, Comments: 1
Last comment 11/10/2016 by Bayes
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WoW Blog (Woman of the Week)

163 blog entries, 459 comments (0 Viewing)

Woman of the Week - Vera Rubin

12/05/2016 by lmno24
From a young age, Vera Rubin had a fascination with the stars. No, not celebrities in tabloid magazines, but the ones in the sky. She grew up in Washi...
Views: 96, Comments: 0

Woman of the Week - Émilie du Châtelet

11/28/2016 by lmno24
By today’s standards, émilie du Châtelet’s resume would be an impressive one. She was a French natural philosopher, mathemati...
Views: 330, Comments: 3
Last comment 11/30/2016 by Jpfalt
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"On This Day" In Engineering History

236 blog entries, 829 comments (0 Viewing)

December 9, 1937 – Death of Nobel Prize Laureate Gustaf Dalén

12/09/2016 by MaggieMc
Born on November 30, 1869, Gustaf Dalén grew up with the intention of taking over his father’s farm, until Gustaf de Laval, another Swedi...
Views: 21, Comments: 0

December 8, 2001 – The Death of Betty Holberton

12/08/2016 by MaggieMc
On December 8, 2001, Betty Holberton died in Rockville, Maryland. Holberton, born Francis Elizabeth “Betty” Snyder, is most widely known f...
Views: 99, Comments: 7
Last comment 12/09/2016 by redfred
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Rockaholic Adventures

50 blog entries, 610 comments (0 Viewing)

Morphology of Olympus Mons

12/05/2016 by Shawn
After discussing the morphology of Olympus Mons I felt compelled to share my intuition of the shield volcanos existence and morphology strictly throug...
Views: 91, Comments: 5
Last comment 12/08/2016 by Shawn

Levees Fail Again

03/10/2016 by Shawn
Lack of accurate data plagues geological predictions. Whether we are assessing climate change, tropical storm probabilities, or the significance of...
Views: 486, Comments: 13
Last comment 12/09/2016 by Shawn
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Defense & Security Technology

109 blog entries, 1643 comments (0 Viewing)

Lidar Gives Armor Crews Model of Surroundings

12/03/2016 by Engineering360 eNewsletter
Under the U.S. DARPA's (Defense Advanced Research Projects Agency's) Ground X-Vehicle Technologies program, Raytheon is using a lidar to create a 3D m...
Views: 79, Comments: 1
Last comment 12/09/2016 by MR. Guest

Hybrid Offered as Unmanned Army Transport

11/16/2016 by Engineering360 eNewsletter
QinetiQ North America and Estonian partner Milrem have developed the Titan, a hybrid unmanned ground vehicle to meet U.S. Army requirements for its Sq...
Views: 110, Comments: 0
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The Engineer's Notebook

376 blog entries, 5880 comments (0 Viewing)

The Prescription for Success: Examining the Big Picture

12/02/2016 by MaggieMc
The other day I was reading “Model-based approach examines entire subsea BOP control system rather than address component failures with ‘B...
Views: 163, Comments: 4
Last comment 12/03/2016 by tcmtech

Perpetual Motion Firm Steorn Finally Goes Under

12/02/2016 by Jonathan Fuller
Last month, Irish tech startup Steorn permanently shut its doors. Steorn operated as an unsuccessful e-commerce developer from 2000 until 2006, when i...
Views: 215, Comments: 13
Last comment 12/04/2016 by lyn
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Caption This!

389 blog entries, 16492 comments (0 Viewing)

Caption This for 12/09/16

12/08/2016 by LakeGrl
This week's image: Be sure to vote for your favorite caption! Thanks to Nigh for submitting this image.
Views: 281, Comments: 31
Last comment 12/09/2016 by Usbport

Caption This for 12/02/16

12/01/2016 by LakeGrl
This week's image: Be sure to vote for your favorite caption! Thanks to Alex. Roman for submitting this image.
Views: 395, Comments: 23
Last comment 12/03/2016 by Rixter
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Animal Science

235 blog entries, 2142 comments (0 Viewing)

Bats and Bananas

12/01/2016 by BestInShow
In the process of researching my last blog about Bananapocalypse, I discovered a surprising number of uses for banana peels. Did you know that you can...
Views: 278, Comments: 11
Last comment 12/08/2016 by Kris

Bird Banding Technology Part 2

11/22/2016 by John Loz
- Modern Bird Banding - Hand tying silver wire onto a bird’s leg by John James Audubon in the 1700’s evolved to become today’s fact...
Views: 104, Comments: 2
Last comment 11/28/2016 by John Loz
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Challenge Questions

346 blog entries, 28316 comments (1 Viewing)

Crypto Conundrum: Newsletter Challenge (December 2016)

This month's Challenge Question: Specs & Techs from IEEE Engineering360: A security consultant wants to monitor the communications of a target wh...
Views: 416, Comments: 10
Last comment 12/05/2016 by Randall

Natural Variations: Newsletter Challenge (November 2016)

This month's Challenge Question: Specs & Techs from IEEE Engineering360: Natural variations in repeated measurements form a normal distribution....
Views: 902, Comments: 8
Last comment 12/09/2016 by Kris
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The CR4 Admin Blog

99 blog entries, 1469 comments (0 Viewing)

New: CR4 Commenting on Engineering360 & Electronics360

11/30/2016 by SavvyExacta
Starting December 1, 2016, CR4 users will be able to comment on articles from both Engineering360 and Electronics360 with their CR4 accounts! A piece...
Views: 90, Comments: 4
Last comment 12/01/2016 by SavvyExacta

Welcome New CR4 Bloggers!

11/16/2016 by SavvyExacta
CR4 has welcomed several new bloggers over the past few weeks... and some veteran bloggers have also rejoined us. Be sure to check out their posts!...
Views: 123, Comments: 0
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Great Engineers & Scientists

145 blog entries, 500 comments (0 Viewing)

The First Lady of Structural Engineering

11/28/2016 by MaggieMc
Elmina Wilson is widely regarded as “the first lady of structural engineering.” Born on September 29, 1870, Elmina came from a family of w...
Views: 129, Comments: 1
Last comment 11/30/2016 by gideon
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Notes & Lines

37 blog entries, 279 comments (0 Viewing)

Why's It So Hard to Build A Decent Music Hall?

11/21/2016 by Jonathan Fuller
On October 31 construction work on the Hamburg Elbphilarmonie concert hall officially ended. The magnificent glass façade sits atop an abandone...
Views: 404, Comments: 16
Last comment 12/05/2016 by Charlie Greenwood

Musical AI Takes Off

07/28/2016 by Jonathan Fuller
Music is a no-brainer when it comes to AI research. It has a finite set of rules, a relatively limited scale, and pretty strict limits as to what &ldq...
Views: 207, Comments: 0
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40 blog entries, 314 comments (0 Viewing)

Can Brain and Spine Implants Help Overcome Paralysis?

11/15/2016 by Bayes
Let me start with a word of caution regarding this article. The work done is very preliminary, for a very specific type of spinal injury, and far from...
Views: 96, Comments: 1
Last comment 11/15/2016 by SolarEagle

Impossible EM Drive Works - NASA

11/08/2016 by Bayes
For years now, the EM Drive, a propellantless thruster that physicists insist should be impossible, has produced measurable force in test after test....
Views: 549, Comments: 15
Last comment 11/14/2016 by Thomas Wiklanski
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65 blog entries, 578 comments (0 Viewing)

The San Fran Skyscraper with a Six-Inch Slant

09/28/2016 by HUSH
Skyscrapers are a lot more to a city than just real estate. They represent financial prosperity and engineering acumen. They transform the identity of...
Views: 651, Comments: 19
Last comment 12/04/2016 by dj95401

World's Most Dangerous Dam Threatens Up to 1.5 Million

03/30/2016 by HUSH
There could be an unprecedented engineering disaster in the weeks or months ahead. Mosul Dam in north Iraq is dangerously close to collapsing, years...
Views: 732, Comments: 12
Last comment 03/31/2016 by SolarEagle
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TechnoTourist’s Engineering Expeditions

83 blog entries, 490 comments (0 Viewing)

A Piece of Ireland in Texas

08/23/2016 by joeymac
Everyone knows that kissing the Blarney Stone over in Ireland is supposed to give a person the gift of gab and eloquence of speech. I was fortunate en...
Views: 349, Comments: 7
Last comment 08/25/2016 by joeymac

Amsterdam's Canals

07/13/2016 by joeymac
When I went on my European trip another stop I made was to Amsterdam, and I was fascinated by all of the canals and bridges connecting to everything....
Views: 220, Comments: 0
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Relativity and Cosmology

147 blog entries, 3996 comments (0 Viewing)

Another Relativity "Paradox"

04/11/2016 by Jorrie
A futuristic spaceship is stationed at its base, which is static at 10 light years (ly) from Earth in free space. The ship and base clocks are rat...
Views: 600, Comments: 27
Last comment 06/07/2016 by tick-tock

Time Dilation and Lorentz Contraction Revisited

03/27/2016 by Jorrie
- Intro - There are many fundamental relativity discussions that are buried deep inside related threads and hence very difficult to access at a...
Views: 1732, Comments: 130
Last comment 08/18/2016 by ralfcis
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IHS Product Design Blog

5 blog entries, 1 comments (0 Viewing)

Engineering Webinar Calendar - April 2016

04/04/2016 by SavvyExacta
Engineering360 has a great lineup of webinars each month. Learn about specific topics from industry experts, for free, from the comfort of your own...
Views: 188, Comments: 0

Webinar Calendar – January 2016

01/11/2016 by SavvyExacta
Engineering360 has a great lineup of webinars each month. Learn about specific topics from industry experts, for free, from the comfort of your own...
Views: 405, Comments: 0
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Roger's Equations

171 blog entries, 1764 comments (1 Viewing)

A Gravitational Wave Observatory in Space

03/18/2016 by Bayes
Given the recent success of LIGO detecting gravitational waves, it shouldn't be surprising there is renewed interest in the press regarding other plan...
Views: 363, Comments: 3
Last comment 03/22/2016 by Bayes

Mathematical Structures in Classical Books

01/28/2016 by Bayes
I came across this very interesting article regarding fractal structures in classical literature and thought I'd pass it along. - R - Scientists find...
Views: 369, Comments: 7
Last comment 02/03/2016 by BestInShow
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What Is It?

68 blog entries, 1860 comments (0 Viewing)

What is It? for December 16

Do you know what this is? Share your answer, below! Submitted by CR4 user Whitephone.
Views: 842, Comments: 18
Last comment 12/21/2015 by Hilton
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Other Blog Entries of Interest

Archer Automaton

12/07/2016 posted in Workbench Creations
by Del the cat
For ages I've been tinkering with the idea of making an archer automaton. There are some superb Japanese ones, but while they are incredible pieces of...
Views: 314, Comments: 20
Last comment 12/09/2016 by Deefburger

What is Really Missing From Soylent?

11/14/2016 posted in Food & Beverage Technology
by Tourmaline
What is really missing from Soylent? The idea of a meal replacement bar, shake, or pill is a delightful one. Imagine not having to worry about cookin...
Views: 184, Comments: 9
Last comment 11/16/2016 by phoenix911

Next Book- Three Moments of an Explosion

11/04/2016 posted in The CR4 Book Club
by Bayes
For any CR4 members that are interested, the CR4 Book Club will next be reading and discussing Three Moments of an Explosion by China Mieville. Her...
Views: 211, Comments: 0

Book Club Discussion: Dark Matter by Blake Crouch

10/31/2016 posted in The CR4 Book Club
by Bayes
CR4 Book Club Discussion: - Dark Matter - by Blake Crouch (2016) A group of us at IEEE GlobaSpec read Dark Matter by Blake Crouch. We discussed th...
Views: 231, Comments: 22
Last comment 11/06/2016 by Rixter

3D Printing a NASA Space Wrench - Video

02/01/2016 posted in Workbench Creations
by SavvyExacta
Watch our 3D printer create a NASA space wrench! You may have seen our previous posts explaining that we would be conducting a live Periscope broadca...
Views: 698, Comments: 1
Last comment 07/12/2016 by MR. Guest