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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, 29 May 2017 06:27:42 EST

Copyright: Copyright 2017

Drug Administration guarantees the safety

Mon, 29 May 2017 06:27:42 EST

Marine Muscle Food and Drug Administration guarantees the safety and reliability of the product by means of which many steroids supplements have been escaped and selling their rip-off merchandise to the naïve and gullible human beings. Marine Muscle will make certain you who you have become a

LV D.O.L starter Thermal Overload position

Mon, 29 May 2017 03:25:55 EST

Normally in D.O.L motor starter the thermal or EOCL relay installed after magnetic contactor . why not it is installed before magnetic contactor b/c in this way , some how we even protect the magnetic contactor power contract against damage due to high current.

Grounding for NGR of Transformer

Sun, 28 May 2017 23:41:28 EST

Dear Sir and Friends, good morning I wanna ask about grounding for NGR. Is there any standard that stated for grounding of NGR must be directly connect with ground rod? What if grounding of NGR just connected to grounding grid system? As we know that the philosophy of grounding, wether connect to

Obtain Saturated Air from Unsaturated Air Without Adding Any Moisture

Sun, 28 May 2017 21:48:22 EST

Hi, I saw this question on the book Thermodynamics- Cengel The first answer I thinked was rise the pressure of the mixture. The solutions manual says the way to do it is colling the air at constant pressure. On this discussion in yahoo answers I saw an instersting answer: "It is much easier to r

overhead Line Testing

Sun, 28 May 2017 18:05:57 EST

Hi We have just constructed a New transmission line having Rail conductor 132kv double vertical circuits line, and now we performing HI-POT 80kv test which is the common practice in my country before line energize , when I perform the test in the small section of the line (Hi-Pot phase to ground) t

Problems in society

Sun, 28 May 2017 17:30:25 EST

Is poor planning of building structures a problem in society then how

Scrap Yard Save! 1930's - 40's Burke B-100-4 Horizontal Mill!

Sun, 28 May 2017 16:35:58 EST

The other week I did a road trip to work on stuff for a buddy of mine and came home with a bunch of goodies as payment one was a Burke Machining Co horizontal mill from the late 30's to mid 40's I pulled out of load of scrap iron that came from some farm clean up job they had! It was a but dirty an


Sun, 28 May 2017 14:07:11 EST

what are the drawings used for instrumentation shop drawing?what are we have to add on IFC?


Sun, 28 May 2017 12:51:40 EST

I have been studying gears and there is this law of gear ratios that say that small diameter gears when rotated 2 times , then the large diameter gear rotates one time. (Assuming 2:1 ratio). but if we are using big diameter gear as drive gear and using to rotate small diameter gear, then torque shou

Vector Parallel to the Line

Sun, 28 May 2017 05:01:55 EST

Hi Guys! I was doing a vector math problem since we have this module in this semester in math,I'm an electrical engineer student don't get me wrong and I gat stuck on how to find the vector parallel to the line. The question is : Determine if the plane given by -x+2z=10 and the line given by r=(5,2-

Fingerprint Sensor Based on OLED Microdisplays

Mon, 29 May 2017 04:00:00 EST

An optical fingerprint sensor integrates an OLED microdisplay as a light source on a microchip along with photodiodes. With the technology developed at Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology, Germany, objects can be illuminated as the reflected light is det

Low GWP Refrigerants — Understanding GWP, GHG, ODP, and Climate Change

Sun, 28 May 2017 04:00:00 EST

Low global warming potential (GWP) refrigerants emerging today can be grouped into several categories, making selection complicated. While low GWP is important, it is only one of many factors involved in refrigerant selection and safe use. ------- Editor's Note: This news brief was brought to yo

Is Alexa Your Friend?

Sat, 27 May 2017 16:00:00 EST

Are Alexa, Siri, and Roomba making up the members of your ‘Sex-in-the City”-like posse? Are you confiding in or laughing with them? Or are you treating them like pets? Researchers from the University of Michigan interested in the increased rates of feelings of loneliness and isolation r

How Technology Has Changed the Construction Industry

Sat, 27 May 2017 04:00:00 EST

To say that the construction industry has changed due to technological advances is an understatement. Once expensive and time-consuming, construction projects are now happening much more quickly and for a lot less money. ------- Editor's Note: This news brief was brought to you by the Building &

Caption This for 05/26/2017

Fri, 26 May 2017 20:45:00 EST

This week's image: Thanks to user Charlie Greenwood for the submission. Entries are always welcome!

California Drivers Are Saying Goodbye to Botts' Dots

Fri, 26 May 2017 04:00:00 EST

Many drivers in California are mourning their state transportation department's (Caltrans) decision to phase out Botts’ dots on the state's roads. The dots in question are round, raised pavement markers used to mark lanes on highways and arterials in lieu of striping. Botts’ dots, which

The Role of Ultracapacitors in Automotive Technologies

Fri, 26 May 2017 04:00:00 EST

Ultracapacitors have been integrated into conventional, electric, and hybrid-electric vehicles to help alleviate stress and extend the life of their batteries. They produce peak loads on demand and withstand repeated charge cycles without degradation, thereby improving fuel efficiency and reducing C

These Sneaky Stink Bugs Could Ruin Your Wine

Thu, 25 May 2017 17:00:00 EST

Growing up in Pennsylvania, we had stink bugs everywhere—in our house, in our beds, on our dog. It’s rumored the little invasive species hitched a ride to Allentown, Pennsylvania from China or Japan. If they haven’t reached your locale yet, consider yourself lucky. They’re gr

6 Mile Road, Detroit’s Center City: Where We Never Felt threatened

Thu, 25 May 2017 13:00:00 EST

Thanks to the folks at Motorbooks, we recently got a preview of Tom Cotter and Michael Alan Ross’s upcoming book, Motor City Barn Finds, in which they explore Detroit for the cars that built the city. In this excerpt, we catch up with them as they meander along 6 Mile Road.] Wednesday, July 2

Automated System Co-pilots a Simulated Boeing 737

Thu, 25 May 2017 04:00:00 EST

This robotic co-pilot is designed to function as a second pilot in a two-crew aircraft, enabling reduced crew operations while ensuring mission success. The automated flight capabilities were engineered by Aurora Flight Science. ------- Editor's Note: This news brief was brought to you by the Ae