Engineering

Geometric modeling is a collection of computerized modeling system. It uses computational geometry and mathematics to create, optimize, analyze, model, and modify designs.

don't b so expressive

Elliptical Curve Cryptography.

WAP Binary XML (http://www.w3.org/TR/wbxml/). Using WBXML with shared tables can cut size by upto 70%. Without shared tables, the size reduction is in the range of 50%. Note that the longer your tag names, the more savings WBXML will provide.

Doppler RADAR measures the speed of objects using the Doppler effect (discovered by the Austrian mathematician and physicist Christian Andreas Doppler in 1842 at the Prague Polytechnic) in addition to the position measured by ordinary RADAR.

The earliest version of Doppler RADAR was introduced by the U.S. Navy during WW2 on night fighters.

Doppler RADARs are used now in aviation, sounding satellites, meteorology, police speed guns, radiology and healthcare (fall detection and risk assessment, nursing or clinic purpose), and bistatic radar (surface-to-air missile).

Live load is a load on the object other than the load from itself.

Engineers are vital to day-to-day environmental problems like dealing with waste and making sure the water supply is clean and reliable. They design waste treatment plants, as well as the necessary technology to monitor water quality.

It is always found bonded with other elements, it goes through a process to become a single element.

10 ft

The term "pipe spool" or "spool piece" refers to a prefabricated section of a piping system that includes the pipe, fittings and flanges that are pre-assembled in the fabrication facility and then transported to the field. The reason for pre-assembly is that hoists, gauges, material and tools are available for the assembly in a controlled environment. The size of the spool pieces is limited by factors related to transportation to the site and ability to handle the spool piece at the site during assembly.

"INSULATION resistance is not about standard nd safe range because resistance value depend upon the application for which we are providing it in what range the current flows."

The answer above is incorrect. Application and current rating & range have nothing to do with insulation resistance. There are standards available for insulation resistance testing both in terms of the test procedure and the values. IEEE Standard 43 provides a basis for insulation resistance testing. Both NETA ATS (Acceptance Testing Specification) and NFPA 70B gives criteria for insulation resistance testing.

Insulation Resistance (IR) testing, also known by the slang terms meggering or megging, is a procedure where the quality of the electrical insulation is evaluated to determine if it is acceptable for service. It is also used to compare against previous measured values to determine if there has been any degradation to the equipment being tested. In this case we are talking about motor insulation. The question deals with two comparative readings and wants to know if the value of 30 megohms is acceptable.

First we should clarify the test methods and results. NETA ATS 2007. Section 7.15.1 covers AC induction motors and generators. The testing involved is broken down into those motors 200 hp (150 kw) and less, and those > 200 hp (150 kw). The test voltage value is based upon the voltage rating of the motor's winding and is found in table 100.1:

Rating = 250V; Test Voltage = 500 VDC; Minimum Resistance = 25 megohms

Rating = 600V; Test Voltage = 1000 VDC; Minimum Resistance = 100 megohms

Rating = 1000V; Test Voltage = 1000 VDC; Minimum Resistance = 100 megohms

Rating = 2500V; Test Voltage = 1000 VDC; Minimum Resistance = 500 megohms

Rating = 5000V; Test Voltage = 2500 VDC; Minimum Resistance = 1000 megohms

Rating = 8000V; Test Voltage = 2500 VDC; Minimum Resistance = 2000 megohms

Rating = 15000V; Test Voltage = 2500 VDC; Minimum Resistance = 5000 megohms

Rating = 25000V; Test Voltage = 5000 VDC; Minimum Resistance = 20,000 megohms

Rating = 34500V; Test Voltage = 15000 VDC; Minimum Resistance = 100,000 megohms

It is important to note that the values given are based on a standard temperature of 40C (or sometimes 20C depending on the engineer's specification). You must correct your readings to a standard temperature as the value on the insulation's resistance is going to vary inversely with temperature. That is as temperature increases the resistance will decrease. The rule of thumb is that the measured value will halve for every 15C above standard and will double for every 15C below standard. As an example let us say that we have a 25 hp induction motor rated 480 VAC. The ambient temperature is 15C. Using our table we would set the tester to 1000 VDC and take a reading for one minute. At the end of the minute we get a reading of 450 megohms. Per NETA ATS Table 100.14 the correction factor is 0.31 so IR = 450 megohms x .031 = 139.5 megohms. The minimum acceptable value is 100 so this motor is acceptable. On the flip side if the motor is in a very warm process area, say 50C, then temperature correction factor is 1.59 thus IR = 450 megohms x 1.59 = 716 megohms. As you can see the temperature makes a very large difference in the results! This discussion up to this point has been about a spot-reading check. However for a true check we want to know the Dielectric Absorption value.

There are two different standard tests for Dielectric Absorption. The first is the Dielectric Absorption Ratio (DAR) and the second is the Polarization Index.

DAR = Reading @ 60 sec / Reading @ 30 sec. Let us say that the 30 sec reading = 325 megohms and the 60 sec = 450 megohms. Thus:

DAR = 450 megohms / 325 megohms = 1.38 The minimum DAR per NETA is 1.4 so this particular motor is borderline at best and should be investigated further.

PI = Reading @ 10 min / Reading @ 1 min. Let us say that the 1 min reading = 450 megohms and the 10 min = 1100 megohms. Thus:

PI = 1100 megohms / 450 megohms = 2.44 The minimum PI per NETA is 2.0 so in this case the motors is acceptable.

One final factor that should be taken into consideration is Relative Humidity (RH). The amount of moisture present in the air also affects the measured test values. The more moisture then the lower the reading. There is no published standard correction factor for RH however when NETA Techs perform these tests then they always record the RH for baseline comparison. The bottom line is that the readings will vary based upon temperature and humidity. A reading on warm humid day may be acceptable whereas the same reading on a cold dry day may not.

So the question asked here is unanswerable as there is not enough information given. What were the temperatures at the time of the readings? Was it dry during one and raining during the other? What does the person asking mean by "normal conditions"?

I highly recommend that anyone interested in this subject get the free book "A Stitch in Time" by Biddle at:

http://www.biddlemegger.com/biddle/Stitch-new.pdf

Please note that I also changed the category from Health/pregnancy to Electrical Engineering.

I use Vista Ultimate and IE 7 but I found that in my case this problem was caused by Kaspersky Internet Security Suite 7.0.1.325. Right Click on the Kaspersky Icon next to the Clock - Select Settings - Click Traffic Monitoring - Then Select "Do Not check Encrypted Connections" listed under Encrypted connections. I believe some people are having similar problems but the cause is Norton 360 and some have found that their time or date is not correct either in the BIOS or Windows.

Greenwich University has a national ranking of 87 out of 118 institutions in the UK. The university has a world ranking of 701.

by weathering and erosion

Speed is measured by calculating the distance you have gone and how long it took you to get there. speed = distance over time

1 disadvantage is that it might not always be as accurate as you want it to be

Most metals carry electrical properties. When these metals connect in a common environment, corrosion occurs. An example is when an old rusty pipeline is linked to a clean and new pipeline. This stark difference causes the new steel pipe to corrode quickly. Hot weather, soil types and the growth of microorganisms like fungi and algae also contribute to pipeline corrosion.

Manufactured boards are made from waste wood glued together, that forms the board under heat and pressure.

Manufactured boards, because of the fact they are made from 'waste wood', are basically recycled boards, which means there is no direct deforestation needed to create a board.

They can be recycled themselves, and are totally biodegradable.

The Sears Tower was taller than both of the twin towers. Although the new world trade center will be taller.

The Sears Tower was renamed Willis Tower on July 16, 2009.

It will break or fail. The type of failure will depend on how brittle/ductile it is. Brittle material will break cleanly, while ductile material will deform to varying degrees.

LOAD FACTOR = AVERAGE LOAD ÷ PEAK LOAD AVERAGE LOAD = KW-HRS (ENERGY) ÷ NO. OF OPERATING HOURS IF THE LOCAL PUBLIC ELECTRIC COMPANY CANNOT SUPPLY A CERTAIN PLANT DURING PEAK HOURS -- THE SOLUTION IS TO USE A SECONDARY PRIME POWER FROM THE ENDUSER TO MEET DEMAND LOAD. IF THE ARRANGEMENT IS 12 HRS. FOR NORMAL POWER AND 12 HRS. FOR GENSET -- THE LOAD FACTOR IS THE SAME IF THE AVERAGE LOAD IS CLEARLY DEFINED.

This is not a straightforward question. It's not too hard to develop an Excel spreadsheet parameterized by the width and length of the space to be covered, and the height of the roof, but there are other significant elements like the thickness of the lamella and the nature of the connectors. The basic idea is that each lamella arch is circular in section, with an integral number of lamellas, skewed with respect to the orientation of the space. Then each of the, say, n lamellas subtends an angle equal to 1/n of the angle subtended by the whole arch, so its unadjusted length is easy to calculate.

diesel isn't cracked, but a heavy oil fraction is cracked to obtain diesel

the modulus for brass is 91*109 Nm-2

From a nursing perspective...

The gauge of the needle tells us the size of the lumen (inside) of the tube. Size 18 is big whilst size 30 is small. If we want a substance that we're injecting to have low pressure (ie if cleaning a wound with saline and not wanting it to hurt or disturb the healing and using a syringe to apply it) then we use a large size (ie 16).

Hope this helps

Hope this is right.