Recent content by mymachine

Are they the same? Quartzite is found in the nature as the rock form. The colors are, some light brown, and some transparent. Silicon dioxide is a powder, its color is white. What is a silica? Is there available a picture/image of a silica? I have a mix of rocks such as below...

What I meant as a burnt is such as the below image: burnt bread

Why a silica powder is melting but not burnt when heated? Thank you

So the brown-color silica gravel and the white silica powder is different? Or both are the same? If same, the brown-color silica gravel is being cleaned until the color is white. Next crush it using the stone crusher machine to get the powder?

This is the silica gravel that I already own: http://images-en.busytrade.com/174645700/Silica-Sand.jpg If I compare to the other silica form such as below silica powder: http://whitefieldminerals.com/documents/product/170e23da48aa40aca37e3a62b3f92023_12.jpg"]silica[/PLAIN] powder...

How do you construct the arc of the circle as a straight line by geometry not by an equation? Thank you

What is the name of this parts and what is the material is used to make this part? http://upload.wikimedia.org/wikipedia/en/8/8c/Stone_Grinder.jpg Thank you

I wonder what is the material is used to make an electronic chip? http://datasheet.seekic.com/ImageFile/MCP/Microchip_MCP4922-E_ST85280.jpg"]Image[/PLAIN] of an electronic chip. I also would like to know what is the material of the bottle of the coca cola soft drink? Is it pure silica glass...

If it be approximated, then the circle or curve in the computer graphic software should not looks smooth. How do you approximate the root of 2,3,5,6,7,8,10, and so on? By the numerical method?

I wonder how do I find the root of 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 17, and so on? And why the circle and the curve looks so smooth in the computer graphic software such as AutoCAD, Adobe Illustrator, etc., if the root is can not be found? It should be looks rough. Thank you

How to find the below quadratic function? y = 0, x = 0 y = 2, x = 1 y = 2, x = -1 Thank you

What is meant by the sub-material? Such as if you mix three differential materials, for example, coffee + sugar + water, which one them is the sub-material? Thank you

Is there available any online interactive curve (e.g. Bezier, B-spline, NURBS) software? Thanks guys

OK, I know the value of the knot vector is the value of the point in the x-axis of the cartesian coordinate, where the pieces are join. Also, I know the knot vector is only available in the linear function, am I right? However, I still do not understand. What I had read in my book is, the...

Could anybody tell me what is meant by the knot vector and how to find its value? I read in the book, the value is 0,0,0,1,1,1,4,4,6,6. Also, I think none of the curves-and-surfaces-for-CAGD related textbooks, most of them, I read from library, are not giving information, absolutely, of...