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CR4 - Recent Forum Threads and Blog Entries



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



Published: Sun, 19 Feb 2017 21:55:00 EST

Copyright: Copyright 2017
 



Phase Spectrum

Sun, 19 Feb 2017 10:42:19 EST

Why a simple positive frequency sine wave shows a phase angle of -90 degrees or π/2 radians in the phase spectrum?



Minimum and Maximum Reference VLT HVAC Basic Drive FC 101 (Danfoss)

Sun, 19 Feb 2017 09:32:21 EST

Hi members , I am currently auditing several commercial buildings and as a part of this project , the cooling towers in such buildings use a Danfoss VLT HVAC Basic Drive FC 101 drive. Its a 1.1kW 3phase motor , 1440 rpm IM . When i click on the drive to understand different setting , i came acros



How Many Cycles?

Sun, 19 Feb 2017 07:56:35 EST

Greetings, and I hope this first post makes sense! I have machine that uses compressed air. Rather than using a compressor for this machine, we are considering nitrogen gas since it's use is infrequent. The specifics are a 40 Cu Ft Nitrogen tank, filled to nominal 2200 psi. at room temperature. Th



Radar Type Level Transmitter

Sun, 19 Feb 2017 05:21:53 EST

Hi, Recently i am doing with a datasheet of a Radar type level transmitter.But i am findings difficulty with the terminology (Measurement-Section) attached in the image.How could i define HmHiTL(SL-76) as there is no indication about it in vessel specification. or what should be the Maximum measu



Woodward 505 Question

Sat, 18 Feb 2017 20:20:43 EST

Hy . we have facing problem with our turbine control system woodward 505 ,last two days turbine tripped . last cause showing on woodward display is External trip input , we check all fail safe loop. contactor also replaced . but still facing same fault any suggestion



Matlab Question

Sat, 18 Feb 2017 19:32:50 EST

please help me in finding the frequency of this graph in matlab. and tell me how to find the value of X axis when Y axis is at 0.



Death of Diesel Vehicles

Sat, 18 Feb 2017 12:00:19 EST

http://www.managementtoday.co.uk/death-diesel-cars/article/1207910 With the recent announcements from within the UK and EU, the diesel vehicle is in its death throws. All down to the high pollution levels they create. It is looked to be fully off the roads by 2020 and only petrol, hybrid and electr



Email - Perplexing Experience

Sat, 18 Feb 2017 07:16:12 EST

I received a phone call from a ex-colleague asking me whether I have used the common e-mail address (and password) of the firm to send a personal email recently. I have left the firm six month back and never used their e mil since then. Further I had even forgotten user ID and Password and hence cou



How do I Calculate the Force from a Bolt Used as a Jack Bolt

Fri, 17 Feb 2017 21:52:01 EST

We have a weldment that has 2 steel blocks that are threaded. We install a 1" Gr 8 Coarse thread bolt into each one. They are used as jack bolts so once the weldment is attached to a piece of equipment, the bolts are turned out to push up against a bolt head or machined surface on a piece of equipme



4-20 mA Surge Protector

Fri, 17 Feb 2017 21:14:25 EST

Hello everyone, Does anybody know about a surge protector for 4-20mA signals that can easily be switched from 2-wire to 4-wire and vice versa without rewiring any field wire or internal wiring in a control panel? Thanks for the help!



Four Reasons to Meet Elasto Proxy at IDEX 2017

Sun, 19 Feb 2017 21:55:00 EST

IDEX is the world’s most strategically important tri-service defense exhibition. For OEMs, military buyers, and prime contractors, this global event is the place to find technologies for land, air, and sea. The International Defense Exhibition and Conference (IDEX) is also where defense subcon



Project Startups Showcase Carbon Capture Technology

Sun, 19 Feb 2017 05:00:00 EST

After years of work, two carbon capture projects are entering service, shining a spotlight on technology that captures and reuses carbon dioxide from fossil-fired power plants. Petra Nova first captured carbon dioxide on September 19, 2016, and the Kemper County energy facility is expected to be in



Engineers Tap Stomach Acid to Power Tiny Sensors

Sat, 18 Feb 2017 05:00:00 EST

Researchers at MIT and Brigham and Women’s Hospital have demonstrated a voltaic cell that is sustained by the acidic fluids in the stomach. The system can generate enough power to run sensors or drug delivery devices that can reside in the gastrointestinal tract for extended periods of time.



Brains and Birth Order

Sat, 18 Feb 2017 05:00:00 EST

This is less of a blog post and more of a memo to my younger siblings. I was right all along. I am smarter than you. Oldest siblings everywhere are walking around cocksure and vindicated this week thanks to a study from an international team of scientists that determined oldest children perform bet



Affordable Collectibles: Trucks of the ’70s

Fri, 17 Feb 2017 14:00:00 EST

Hard to believe for some, but pickup trucks built in the ’70s are becoming collectible. One of the coolest – yet most overlooked – categories of the era, light-duty trucks, are some of the most affordable classics around. And remember: we’re talking about the Seventies, so wh



Power Semiconductor Market in Automotive to Grow by $3 Billion by 2022

Fri, 17 Feb 2017 05:00:00 EST

A new report released by IHS Markit reveals that the global market for power semiconductors used in cars and light passenger vehicles will grow by more in $3 billion in the next six years. ------- Editor's Note: This news brief was brought to you by the Semiconductor & MEMS Fabrication eNews



February 17, 1864—The Hunley Sinks the Housatonic

Fri, 17 Feb 2017 05:00:00 EST

On this day in 1864, the pioneering Confederate submarine H.L. Hunley rammed and sank the USS Housatonic during the US Civil War. She was the first combat submarine to successfully sink an enemy warship. The Hunley was the third prototype submarine developed by businessman, lawyer, and Louisiana st



Caption This for 2/17/17

Thu, 16 Feb 2017 21:45:00 EST

This week's image: Be sure to vote for your favorite caption!



Get Ahead in RF & Antenna Design

Thu, 16 Feb 2017 17:00:00 EST

Interested in simulation for space hardware, broadband macromodeling, interference modeling, synthesis tools, or real-time location tracking? CST has a series of webinars designed to help you "get ahead" in these topics. Check out the list of current offerings to see what might interest you! ----



Will It or Won't It? The Oroville Dam's Potential Collapse

Thu, 16 Feb 2017 15:25:00 EST

It isn’t too hard to argue that here in the United States we take our infrastructure for granted. Next month, the American Society of Civil Engineers will release its 2017 report card on the state of American infrastructure. ASCE updates the report card every four years. In 2013, the cumulativ