A Proposal to Reduce the Delta-V to Orbit.

To reach orbit you have to have your vehicle have a horizontal, i.e., tangential, orbital velocity, of about 7,800 m/s and have sufficient altitude, say at least 100 km, the altitude considered to be "space". To get to this altitude you have to have a separate velocity in the vertical direction. T

Pursuing Perfection: a Fantasy?

The obvious question in the test industry is an age-old one: Can we build completely defect-free electronics? Can we design test strategies that will positively find every product defect? Test professionals and their managers have struggled with these questions for decades. How many failures can we

What's Up with Solar Power?

Yet another alternative energy startup thinks it may have developed the key to widespread commercialization of solar-powered windows and glass. But despite all the efforts and untold billions of dollars in government research and development funding over decades, wide-spread use of solar power seems

fiber optics cable connection

dear friends

I have a project to connect a fiber optics cable between two links with a distance of 50 km, but i have a problem that the cable have to cross a river, so if any one have an idea, let him answer. thanks

Best Regards

Stress Concentration Factor

I'm analysing a component which has a U shaped notch cut in it. Using Petersons stress concentration factor book I can determine a k value but my question is this.

Peterson states this value is for a thin element and in my situation it is actually quite thick. Basically instead of it being

Problem With an Obstacle Avoider Robot

I am doing an obstacle avoider robot as my academic project.It uses 2 ir sensors to detect obstacle.And my platform is pic16f877a microcontroller.the individual working of ir sensors is ok.when working both at the same time..it doesnt work properly ..please help me with a working source code...

Lightening(thunder) arrest

Currently overseeing a building housing electric generation plants...Constantly been periodically distrupted by lightening strikes...can any guide speak by the mercy of ''the Almighty'' on reliability of lightening arrest on prone locations

semiconductor carrier transport

in intrinsic GaAs, electron and hole mobilities are 0.85 and 0.04 m^2/v-s respectively.

corresponding effective mass ---0.068 and 0.5 m0.where m0 is 9.11*10^-31 kg.

if energy band gap at 300k is 1.43eV,

calculate intrinsic carrier concentration and conductivity.

Mobile Phone Lost

i lost my mobile phone so i lost lot of contacts so i am now under very risky condition how can i find that ,please help me to detect the phone by giving some tips

DIY Ford F-150 Gear Swap

In this episode, Motorz TV shows you how to upgrade the gears on a 2005 Ford F-150. There are many reasons to do a gear swap, but in our case it's been needed since the F-150 was lifted 6″ and 35″ tires were added. You see, when you lift a heavy truck like this and add on the ext

Would You Buy This Bandini?

It's amazing how such a little car can have such a huge price tag. This 1955 Bandini Siluro twin-cam, which we had a chance to ogle at Amelia Island this year, not only has excellent racing history and a concours-worthy restoration, but it's being sold by Cliff Reuter, the man who seemingly has

Light Industrial Steel Sheds Statistics

I'm stuck Guys

OK, this is home work in some kind of way. I have searched and asked Google and the Australian bureau of statistics but have no luck finding such basic(?) information. Here is my question:

How many corrugated iron, steel, light industrial sheds, structures are there and how many

Polarized Lens

I am working on a project that involves a magnifying lens that will be left outside for hours at a time. I realize that the lens will burn things that are under it by focusing the sun. Does anyone know of a way to prevent this burning? The lens needs to be uncovered at all times so adding somethi