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Conference Room 4 (CR4)Conference Room 4 (CR4)Conference Room 4 (CR4) is a forum for engineers, scientists and technical researchers to discuss engineering news, seek technical help and get answers to burning questions. 
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The Top 10 Social Media Mistakes (Part 2)
2009-09-24 00:01:00 Uncle Sam wants you to use social media wisely! The message from the Pentagon Channel's latest FNG video won't wind up on a recruitment poster, but the U.S. military does want American men and women in uniform to avoid the top 10 social media mistakes. Fortunately for us civilians, there are s More About: Social , Media , Part
Plastic Concrete: Hippie's Dream, Hit Man's Worst Nightmare
2009-09-23 21:38:00 From Gizmodo: Imagine concrete that's two-thirds granulated plastic, but is as strong as the stuff currently in use. Architect/engineer Henry Miller figured out how to make it, not just on paper, but in a couple of real-life structures. Concrete is usually 60% to 75% "aggregate More About: Nightmare , Dream , Plastic
US looking to deploy long-endurance hybrid airship over Afghanistan
2009-09-23 21:26:00 From Engadget: We may see more airship proposals than actual airships 'round these parts, but it looks like this massive dirigible from Lockheed Martin will indeed be taking flight sooner rather than later, and could see action in Afghanistan by mid-2011. Dubbed the LEMV (or Long E More About: Hybrid
Intel shows chips can get smaller
2009-09-23 21:22:00 From BBC News | Technology | World Edition: One of the world's largest makers of processors has produced what is thought to be the first working version of a 22 nanometre SRAM chip. Some industry experts were surprised, saying they did not think chips could get any smaller. T More About: Intel , Chips
Airlines plan 'to cut emissions'
2009-09-23 21:18:00 From BBC News | Science & Environment | UK Edition: The aviation industry is to pledge to cut carbon dioxide emissions to half the 2005 levels by 2050, the head of BA has told world leaders . British Airways chief executive Willie Walsh said the industry's proposals are "the bes More About: Airlines , Emissions , Plan
Bending Aluminum Tube
2009-09-23 20:42:00 I have an application where in need to bend Alum. tube 6061-T6, I need to bend it to 129 degrees. When I attempt this bend it breaks, the OD of the tube is 1.660 with an ID of 1.380. Several people i have talked with have suggested heating the tube, this should work. My question would be what is the More About: Tube , Aluminum
Bending Alum. Tube
2009-09-23 20:42:00 I have an application where in need to bend Alum. tube 6061-T6, I need to bend it to 129 degrees. When I attempt this bend it breaks, the OD of the tube is 1.660 with an ID of 1.380. Several people i have talked with have suggested heating the tube, this should work. My question would be what is the More About: Tube
How to calculate tonnage of AC?
2009-09-23 19:59:00 When ever we discuss about to install an air conditioner in a room or office, it is difficult for us to calculate the tonnage capacity. For example, we want to install an AC in a room 12' X 12' X 12', what should be its capacity? Is there any "Rule of Thumb"
Why Capacity of Engine measures in CC?
2009-09-23 19:57:00 Can anyone explain that why Capacity of Engine quotes in CC instead of HP? For example, if a bike is 110CC then what would be the horse power capacity of its engine? Is there any rule of thumb?
FEA Analysis for tube sheet
2009-09-23 19:39:00 I wan to do FEA analysis for my tube sheet. Can any body tell me the what is the failure criteria as per ASME VIII Div2?. Also can we use ASME VIII Div1 for FEA analysis? More About: Analysis , Tube , Sheet
Pay internet
2009-09-23 19:03:00 Remember when you could get TV and radio free? You now have to pay to get TV and some radio. There are now sites that you have to pay to view. They switched to digital TV and now we have Sirius an XM and they are trying to get digital HD radio. If that happens, they will have the ability to charge t More About: Internet
DC Motors as Generators?
2009-09-23 18:49:00 Can all DC motors be used as generators? Series, shunt, PM, brushless? More About: Motors , Generators
DC motors
2009-09-23 18:49:00 Can all DC motors be used as generators? Series, shunt, PM, brushless? More About: Motors
Steam Flow
2009-09-23 17:42:00 Hey guys, installed a orifice plate on a steam line. Got the high and low sides ran to a E n H differential pressure transmitter, with copper tubing, to measure the flow. Question: What is the procedure to get the transmitter to read the flow? Do I just turn my hand valves and let it read th More About: Steam , Flow
Generator Life Expectancy
2009-09-23 17:38:00 Can you tell me if there is a rule of thumb for the expected life cycle of a power generator? I realize there are many different types used for many different purposes but provided all maintenance is performed both scheduled periodic and unscheduled at the correct time intervals is there some stand More About: Life , Generator
Knee Point Voltage and Current Transformers
2009-09-23 17:22:00 dear friend, kindly any one explaine me what is the effect of knee point voltage in CT. If one PX Class CT having Vk>300V, Ia<30 mA how i calculate this CT BURDEN also what is the primary current when th ct is satsurated, thanking you, yours , B.JEY More About: Transformers , Current , Point , Voltage
Converting Nm3/hr to SCF/hr
2009-09-23 16:46:00 I would like to convert Nm3/hr into SCF/hr. I was given the information below: Natural Gas: 383.2 aM3/hr, 295.2 kPa, 28.7 C. This translates to 1068 Nm3/hr So I need to convert the 1068Nm3/hr into units we typically use such as SFC/hr Could someone help me with this conversion? Thanks
CoDeSys and CANbus
2009-09-23 16:39:00 Hello all, I'm looking for a good starting point to learn Codesys software. I've searched but so far have not found anything useful. I'm use to using Idec PLC software, but Codesys is totally new to me as well as CAN bus. Is there a "Codesys for Dummies" & "CAN bus fo
UPS Rating and Capacity
2009-09-23 16:05:00 Hi, i need some expert opinion on the UPS rating and capacity that my supplier proposed. We have a few systems that should be wired to this 3-Phase UPS. Ventilation fan = 3.7Kw AHU fan = 2.8Kw Freezer =1Kw Other electrical appliances=1Kw In total
Best regards,le Way to Combat Hard Water
2009-09-23 15:23:00 One of our facilities in eastern Indiana employs well water for the manufacture of liquid dish detergents. The water hardness has changed gradually over the past year or so and is now quite hard at about 275 ppm. Not surprisingly, this is beginning to affect the performance of the end product as har More About: Water , Hard , Combat
How to Treat Hard Water
2009-09-23 15:23:00 One of our facilities in eastern Indiana employs well water for the manufacture of liquid dish detergents. The water hardness has changed gradually over the past year or so and is now quite hard at about 275 ppm. Not surprisingly, this is beginning to affect the performance of the end product as har More About: Water , Hard , Treat
FDA OKs First Human Trial of Neural Stem Cell Therapy
2009-09-23 15:02:00 From Slashdot: An anonymous reader sends word that the FDA has approved a phase 1 trial for Neuralstem, a company with a patented stem cell procedure targeting ALS (Lou Gehrig's disease) and other spinal conditions. The company's CEO said in a press release, "While this trial aims More About: Cell , Human , Trial , Therapy , Stem Cell
Sept. 23, 1869: Here Comes Typhoid Mary
2009-09-23 15:00:00 From Wired Top Stories: 1869: Mary Mallon is born. She might have passed out of this life as just another obscure Irish immigrant in New York, if not for unwittingly contracting typhoid fever and passing it on, as a "healthy carrier," to dozens of people. So history remembers he More About: Sept
GPS Speed Measurement Using Doppler Shift
2009-09-23 15:00:00 Hi, From what i read as of today active speed measurement is done by measuring the doppler shift in the carrier wave.Any guidance as to how one can go about this?The sources in the internet suggest that this is a highly accurate method to measure speed using GPS.Any idead how i should go about it ? More About: Speed , Shift
Invisible Buildings
2009-09-23 14:57:00 From Forbes.com: Technology News: Sebastien Guenneau sees no reason to fight Mother Nature when you can hide from her. The French mathematician has developed an "invisibility cloak," which will protect buildings from the shock of earthquakes. Despite the fact that earthquakes ar More About: Buildings , Invisible
Dust Storm Blankets Sydney as Drought Bites
2009-09-23 14:56:00 From Yahoo! News: Science News: A huge outback dust storm swept eastern Australia and blanketed Sydney on Wednesday, disrupting transport, forcing people indoors and stripping thousands of tonnes of valuable farmland topsoil. The dust blacked out the outback town of Broken Hill More About: Storm , Drought
India Launches Seven Satellites: Space Agency
2009-09-23 14:55:00 From Yahoo! News: Science News: India successfully launched seven satellites including six from foreign countries on Wednesday, officials said, underlining the country's ambitions in the space business. About a month after its first moon mission was aborted, the country's space More About: Space , Satellites , Agency
Disadvantages of ONAN/ONAF against ONAN transformer
2009-09-23 14:55:00 Is there any technical disadvantages of using ONAN/ONAF against ONAN transformer? More About: Transformer
CT Dimensioning K Factor
2009-09-23 14:40:00 Dear all, For CT adequecy check i have calculated the required kneepoint voltage of a CT as per the formula given below (For AREVA Micom relays, formulas used as per AREVA manual) Vk required = k*(Rct+2Rl) where k=0.14*(If*X/R) {when (If*X/R) less than 500} k More About: Factor
Metals or Composites?
More articles from this author:2009-09-23 14:39:00 Interesting piece of news recently that Japanese aircraft manufacturer Mitsubishi has decided to use aluminum rather than carbon fiber for the wings of a new jet it is planning. Why? Because the metal's strength-to-weight ratio makes it a better choice than the newer material. Has the use of composi 1, 2, 3, 4, 5, 6, 7 |
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