hierarch

I meant after I went to bed, I couldn't fall asleep quickly sometimes, but I would fall asleep quickly after listening to radio for a while. Also, keeping regular hours may help your insomnia from my experience.

hi,pha

I suffered from insomnia before I became a university student, but I gradually slept well after I loved to play basketball, badminton, pingpong and so on. In addition, I feel that listening to radio lying in bed is often make me quickly feel very tired and want to fall asleep. I am't sure if the two methods would help your insomnia, you can try them.

It always works when I draw the number 6 in the air with my right hand.

Interesting. But how to explain it?

hello,

I'm a PhD candidate in chemical engineering from China. I'm fascinated by adsorption science and technology since that is the subject of my PhD research. But I have interest in the other areas of science, too.

I like to play basketball, badminton, pingpong and bowling in my spare time.

Happy to join this forum and discuss things with you guys.

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The download speed is really very very low for my computer. I have to use a free proxy server when I want to visit an overseas website, which lowers the speed greatly, or I have to pay out a lot of money for accessing to overseas website directly.

Slow as it is, I still enjoy visiting this Scienceforms.

I guess it is from the sizes of some cells are different from that of others. As you can see, the hypotenuse of the top triangle is different from that ot the bottom triangle, indicating the cells are not uniform in size.

Is it right?

Excellent explanation, YT . My hometown is exactly in a area where acid rain is common. Though we can't make sure of it, it seem possible at least.

Well I think the shape or structure of the bass drum also has influence on that audible volume. Then, what shape of the bass drum will be easier to obtain high volume of sound wave?

Apreciate for furthur responds.

there exist some dihalogen molecules: XY = F2, Cl2, Br2, BrCl and ClF

Oh, i though he said skeletons, that are dead...well not dead skeletons...skeletons that have no more flesh on them.

Yes, I meant the dead. In the past, inhumation was prevailing in China and it was not surprising that there were skeletons exposure to air in campo santo. Some old men said they had seen skeletons' self combustion in campo santo in their childhood. I just heard it, but have never seen it.

Anyway, thanks for your response.

You could make sound waves when you bang your hand again desk, wall, bucket and other stuff. But the volume of sound is different from different material even the same force is used. Then the difference is caused by the kinda material? And then what kinda material is easier to generate higher volume of sound?

I know that sound comes from the vibrations transmitted through an elastic material or a solid, liquid, or gas. I am just wondering what kinda material is easier to generate sound? Any body can shed light on it? Thanks in advance.

Two molecules walking down the road, one says to the other "I think I`ve lost an Electron!" the other one says "Are you Positive?"

I am changeing it into:

Two women walking down the road, one says to the other "I think I`ve lost an Electron!" the other one says "Are you Positive?"

Is it more funny?

I've heard many stories about skeleton's self combustion and it said that the combustion is due to the phosphor in the skeleton. In chemistry class I have also learnt that phosphor is tend to self combust.

But I am not perfectly sure about it.

Off this thread, I am wondering why a hen lay some unfertilized eggs? It seem wasteful for the hen to generate its offspring.

Well' date=' thx to the responds......

 

 

pour the seawater (about 200cc) in a big beaker......

Use a big sponge to fill the top of the beaker...leaving no spaces to let the steam out......

but still leaves a certain distance from the seawater to the sponge.......

use a bunsen to heat the beaker.....

when the water is gone, leaving the remaining salt at the bottom........

take the sponge carefully out of the top of the beaker.....

 

then squeeze the sponge in another beaker.......

 

 

I think it is going to work....

 

but still....

 

[i']Any suggestion?[/i]

 

Albert

In fact, it is a form of evaporation using sponge to collect condensed water. Distillation is more efficient than it.

Here is my answer.

The seeling price is not less than zero, and the selling price should be not less than the sum of the cost and the seeling price. Then we have

c = 220 - 3x >= 0 (1)

x >= 40+(220-3x) (2)

From equation (1) and (2), the range of x is obtained:

65 <= x <= 220/3 (3)

similarly, we have

d = 250-2y >= 0 (4)

y >= 70+(250-2y) (5)

then, the range of y is obtained:

320/3 <= y <= 125 (6)

and then, the max.

-3x^2-2y^2+180x+180y

=-3(x^2-60x)-2(y^2-90y)

=-3(x-30)^2-2(y-45)^2+3*30^2+2*45^2

<= -3*(65-30)^2-2*(320/3-45)^2+3*30^2+2*45^2 = -4530-5/9

Yesterday I read a paper [D.A. Jones, T.P. Lelyveld, S.D. Mavrofidis, S.W. Kingman, N.J. Miles, Resources, Conservation and Recycling 34 (2002) 75–90] and the following words are quoted from it:

"An important characteristic of microwave heating is the phenomenon of ‘hotspot’ formation, whereby regions of very high temperature form due to non-uniform heating. This thermal instability arises because of the non-linear dependence of the electromagnetic and thermal properties of the material on temperature. The formation of standing waves within the microwave cavity results in some regions being exposed to higher energy than others. This results in an increased rate of heating in these higher energy areas due to the non-linear dependence."

And now, I would like to believe that the ant escaped death is due to the non-uniform heating of microwave, but not its small size.

Yeah, a friend of mine did a report on microwaves. He said that an ant won't die in the microwave because it's too small. Microwaves have more affect on larger objects because it uses waves. That's all I got out of his minute of spewing knowledge on the microwave.

I have a question, if that the ant escaped death is due to its small size, why could powder activated carbon be heated with microwave?

Well, I am waiting for the experimental results concerning microwave and ant your guys will post. It will be exciting since I also has a interest in microwave.

OMG, I can't image one drink Radium water. It is really awful.

At the case of higher concentration of O2, the concentration of CO2 is lower and the respiration of the plant enhances.

I am not sure about it. Just a guess.

I have found more sites described methods for measuring temperature:

http://www.datatranslation.com/emails/120303-usb-dt9805.htm

http://www.sensoray.com/html/tcapp.htm

http://zone.ni.com/devzone/conceptd.nsf/webmain/4C54819521D3503786256D73006E8BE9?opendocument

These sites could be usefull to solve your problem.

How would I do this, though?

Besides thermocouples, you also need a digital temperature meter (I don't get its exact name) for measuring the temperature. The glass and the digital temperature meter are linked by the thermocouples and then the digital temperature meter would display the temperature of the glass. A guy in our group measure the temperature of a reactor with such a method.

You can also use your PC to determine the temperature, as described at this site:

http://www.windmill.co.uk/thermocouple.html

December, the month that I met my girl friend.