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CR4 - Recent Forum Threads and Blog Entries



Recent content from CR4, The Engineer's Place for News and Discussion



Published: Mon, 26 Jun 2017 04:00:00 EST

Copyright: Copyright 2017
 



A 100-Year-Old Physics Problem Has Been Solved

Sat, 24 Jun 2017 21:47:29 EST

In 1914, K. S. Johnson introduced the concept of Q factor. The length of time a signal can be stored in a resonator is inversely proportional to the bandwidth. A high Q resonator can store narrow band energy for a long period of time, a low Q resonator has a larger bandwidth but can store energy for



Auto Transformer Starting System for Induction Motor

Sat, 24 Jun 2017 08:44:34 EST

Stern thruster motor's main breaker located in MSB is tripping after start the motor, we checked the insulation of motor and auto transformer, both are healthy. we checked all contactor , its also good. what is the reasons for tripping main breaker



Minimum Temperature for Underground Pipeline

Sat, 24 Jun 2017 00:28:11 EST

Hello, I did stress analysis for crude oil pipeline, NPS 8 x 6.4 mm WT, design pressure 1440 psi, design temp 90degC and installation temp 8degC a with depth 1.5m. My problem is if ambient soil temp of -5degC is used as a minimum temp, pipeline is overstressed but installation temp of 8deg is used



Ultra-thin Camera Creates Images Without Lenses

Fri, 23 Jun 2017 14:44:07 EST

Interesting, optical phased array. It's been done with microwaves for a long time now. "Engineers have built a camera that does not need lenses to focus light. It can switch from a fish-eye to a telephoto lens instantaneously." It's only an 8x8 element "proof of concept" array and resolution is



Electrical Switchgear

Fri, 23 Jun 2017 09:43:47 EST

I want to know about difference between AC1 and AC3 rating in contractors? Why we use AC3 rating of contractor in inductive load motor? Thank you.



Help with a Krohne UFC 6300

Fri, 23 Jun 2017 01:32:50 EST

Hello guys, i have a optisonic 6300 from krohne, but i don't have any idea how to parametize this optisonic. I tried to follow the settings that the manual informs, but when configuring the sensors simply do not give signal. Sorry for the bad english, i'am from brazil. the optisonic



Rotating Dwelling With Utility Hub Challenge of the Month

Thu, 22 Jun 2017 19:14:33 EST

Suppose you wish to build a dwelling that can be rotated by 360 degrees for several reasons: 1. You want high solar input in winter, and do not want low angle roof overhang to block high angle view (in winter). The old Greek way used the angle of the sun to allow light in during winter months, and



Questions Asked of Job Applicants

Thu, 22 Jun 2017 11:58:07 EST

A far cry from the usual "what do you see yourself doing in five years" question.



Technological Progress

Wed, 21 Jun 2017 22:10:02 EST

Technological progress with robotics is wonderful, but not when it means displacing humans. The purpose of using robots is to increase profits for companies and investors at the expense of human workers. I think the use of robots should be confined only to jobs that are impossible to do by humans an



When is AI Coming for Your Job

Wed, 21 Jun 2017 16:47:32 EST

We can see it coming, the day when humans are no longer employable in certain jobs because a robot has become more cost efficient....How long is your job safe? No one can say, but we can make an estimate.... ..."As MIT Technology Review points out, these predictions have a way of coming earlier.



Multi-touch System Allows Navy Flight Decks to Shuffle Configurations

Mon, 26 Jun 2017 04:00:00 EST

The systems, designated the Deployable Ship Integration Multitouch Systems, upgrade the "Quija board" currently used to organize hanger bays by allowing handlers to plan for future missions or unexpected scenarios. It also allows for easier communication up the chain of the command. ------- Edit



Maker Faire Brings Laser Engraving Action to the DIYers

Sun, 25 Jun 2017 04:00:00 EST

Every year hundreds of Maker Faires take place around the world—San Francisco, New York, China, Germany, France, and countless other locations. Families, enthusiasts, hobbyists and DIYers gather in the spirit of creativity to celebrate the Maker Movement. The fairs, which range from mini-event



Based on Bitcoin: A New System for Online Security

Sun, 25 Jun 2017 04:00:00 EST

MIT researchers have devised a new system to defend against online identity theft using the security machinery of Bitcoin. The new system has implications that go beyond Bitcoin. It can be used to secure other types of systems. ------- Editor's Note: This news brief was brought to you by the Dat



A Diet Rich in...Bugs!

Sat, 24 Jun 2017 04:00:00 EST

If recent research or even common urban legends are to be believed — for every candy bar we consume, we also consume at least eight pieces of insect or that we swallow at least eight spiders in our sleep annually — introducing bugs into our daily diet should not surprise our "delicate" s



Colored Lights Turn on Bacteria

Sat, 24 Jun 2017 04:00:00 EST

MIT researchers have now produced E. coli that has "color vision," meaning that different genes perform different biological functions depending upon the color of light to which they are exposed. This smart E. coli will likely be applied to commercial and pharmaceutical applications. ------- Edi



Caption This 6/23/2017

Fri, 23 Jun 2017 20:45:00 EST

Here's this week's image: Be sure to your favorite caption! Don't forget we are always taking submissions. Thanks to Solar Eagle for the entry.



12-story Wooden "Plyscraper" to Grow in Portland District

Fri, 23 Jun 2017 04:00:00 EST

The 90,000 sq ft structure will rank as one of the tallest timber high-rises to be built in North America. The building will be constructed primarily of cross-laminated timber components, in conjunction with glue-laminated beams and columns. ------- Editor's Note: This news brief was brought to



Will Big Data Force Changes In Online Behavior?

Thu, 22 Jun 2017 04:00:00 EST

I took a management course in grad school in 2009, and just about the only thing I remember about it was learning about the Hawthorne effect. This was research done at a Chicago factory from 1924-32, in which workers supposedly showed an uptick in productivity while participating in a study examinin



Automotive Use Drives Li-ion Demand Growth, Report Says

Thu, 22 Jun 2017 04:00:00 EST

The market for lithium-ion (Li-ion) batteries was 87 GWh in 2016, a tenfold increase from a decade earlier. Automotive uses absorbed almost 50% of that Li-ion battery output in 2016 as the automotive market began to electrify its powertrains. ------- Editor's Note: This news brief was brought to



Mo’s Junkyard Curse

Wed, 21 Jun 2017 13:00:00 EST

[Editor’s Note: Jim Van Orden, Richardson, Texas, who brought us the story of Arlington FryBarger’s Pan-American Highway trip a couple months ago, recently reached into his bag of memories for this account of the junkyards he frequented as a New Jersey youth.] Junkyards were my heaven a