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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, 24 Apr 2017 20:40:00 EST

Copyright: Copyright 2017

Quantum Computing Age Will Start This Year

Mon, 24 Apr 2017 12:24:06 EST

I've been interested in Quantum Computing since the early 2000s because of its potential to revolutionize materials science (see here). A few years back I wrote an article talking about Google's aggressive pursuit of Quantum Computing (article found here). Now it looks like Google is ready to demons

Problem Transmission Line in ETAP

Mon, 24 Apr 2017 11:01:20 EST

i have this error message in etap transmission line (the conductor/wire y coordinate should not be zero) any solution?

Aircraft Assembly Line Thought

Sat, 22 Apr 2017 22:04:45 EST

I have been studying the following simple case: An aircraft assembly line is organized as a flow production process with a certain takt time. The total flow-time for assembly, painting and flight test is 25 days. The paint process takes 4-5 days, depending on the customer specific paint schema (due

The Dark Secret at the Heart of AI

Sat, 22 Apr 2017 13:52:21 EST

No one really knows how the most advanced algorithms do what they do. That could be a problem. Last year, a strange self-driving car was released onto the quiet roads of Monmouth County, New Jersey. The experimental vehicle, developed by researchers at the chip maker Nvidia, didn’t look dif

Automatic Transfer Switch

Sat, 22 Apr 2017 10:10:52 EST

Hi , I am technical professional and want to enquire about the automatic transfer switch technical paramenter and whos ATS is best in the market and why looking for a range in around 160 A-400A only , we have abb, hpl , socomec and L&T in this but which you suggest me use in the project and why

Mass Sign and Effects

Sat, 22 Apr 2017 08:32:01 EST

Since I met the Maxwell equations (oh God, half a century ago) I wonder if given the similarity between electrostatic and gravitational formels there would exist a non conservative, rotational field derived from masses in movement. As all masses have same sign and are attracted each other, this fiel

Definition of Terms

Sat, 22 Apr 2017 04:00:41 EST

I was speaking with an experienced electrician that was working on HVDC transmission switch gear for some wind turbines. Since I know very little about HV transmission I was asking some questions about the workings. We were discussing coronas and lightning and several topics on HV power lines. But h

White Color Scale Removal in Domestic Water PVC Pipes

Sat, 22 Apr 2017 01:11:10 EST

Hi all, I am from Andhra Pradesh state ,India. white colour scale is accumulating inside our domestic pvc pipes and its blocking or lowering the water flow. Is there any safe chemical or method to remove that scale with out replacing pipes.Please learn that , As its drinking water pipes we need safe

Equation For Comparing Flow Rates of Canal as a Function of Inflow Flow Rate?

Fri, 21 Apr 2017 21:14:28 EST

Hello, I am conducting a research project which analyzes flow rates of open channels. In one particular portion of the project, I am analyzing an open channel that is receiving inflow from a separate source. Let us say for the purpose of this question that the flow rate of the water coming out from

Update on the Design Challenge

Fri, 21 Apr 2017 20:07:43 EST

Refer to this week's earlier design challenge, and vote it up or down, work or not work. There are two worksheets pasted here as pictures Sorry about fuzzy pics, will update later. I ran out or replies. CR4 or my IT thinks I am spamming the system.

Woman of the Week – Jane Cooke Wright

Mon, 24 Apr 2017 20:40:00 EST

Jane Cooke Wright (also known as "Jane Jones”) was a pioneering cancer researcher and surgeon. She is most known for her contributions to chemotherapy, specifically with developing the technique of using human tissue culture rather than laboratory mice to test the effects of potential drugs on

Wasteland—From Waste to Architecture

Mon, 24 Apr 2017 15:00:00 EST

The Guess the Architecture post for last week was of a rather unique house by Lendager Arkitekter. The Upcycle House, as it’s called, was an experimental project “aimed at exposing potential carbon emission reductions through the use of recycled and upcycled building materials.” T

Best Practices in Eco-Friendly Innovation for Manufacturing and Materials Handling Industries

Sun, 23 Apr 2017 04:00:00 EST

For many manufacturers, the prospect of moving towards eco-friendly solutions is very much front of mind; however, implementing the necessary changes is easier said than done. There are many available options for saving not only the bottom line, but the environment. Recycling Recycling is somethin

Conflict-Resolving Technology

Sat, 22 Apr 2017 04:00:00 EST

There are few things you can count on in life. Something that can be counted on: conflict with your significant other. Some might argue that it isn’t a true relationship unless you have fantasized about taking the life of your significant other. For better or worse, the people at USC Viterbi

Caption This for 4/21/2017

Fri, 21 Apr 2017 20:45:00 EST

This week's image: Thanks to Lo_Volt for the submission. Apparently this unusual arrangement was found on the farm where he grew up! Be sure to vote on your favorite caption!

Documenting the Smell of History

Fri, 21 Apr 2017 15:00:00 EST

It seems that nowadays, we document everything. We can archive our sense of sight in photographs, the things we hear in audio or video recordings, the things we touch in our collection of significant textiles; we even document our sense of taste in the recipes we pass from generation to generation.

Clear coffee? But how? And why?

Thu, 20 Apr 2017 16:39:00 EST

It seems on any given day, there’s a new trend in coffee from cold brew, K Cups, various sweeteners, brewing styles, etc. But this company is making a product that’s truly out of the caffeine consuming norm. Two Slovakian brothers have introduced CLR CFF, or clear coffee. It’s sol

Physicists Create a Fluid With Negative Mass

Thu, 20 Apr 2017 12:30:54 EST

One of the interesting things you learn early on in physics is that there is nothing in physics that forbids negative mass values. There has long been debate whether or not this really meant objects with negative mass exist. Recently some scientists at Washington State University have demonstrated i

Engine Bay Insulation for Mobile Equipment

Wed, 19 Apr 2017 20:55:00 EST

Engine bay insulation for mobile equipment keeps heat and noise in the engine compartment from reaching the cab interior. The diesel engines that power mobile equipment run hot and loud, which raises concerns about occupant comfort, health, and safety. Mobile equipment manufacturers also need to pro

April 19, 1906—The Death of Nobel Prize Laureate Pierre Curie

Wed, 19 Apr 2017 19:00:00 EST

Thinking back to science class, Curie is a familiar name. Marie Curie is a favorite subject in many courses, especially due to organizing mobile X-ray teams during World War I. Her husband Pierre Curie, who died in a street accident on April 19, 1906, is sometimes seen as an afterthought despite the