Newbies_Kid

Oh, thanks for the tips. I will use that as keyword for my further research. I burn the rice husk in a furnace at 600 deg C to get the white ash. I have custome made furnace for that purpose here in my lab. Then I make Na2O3Si solution by mixing water, NaOH and the ash. I used sulphuric acid to make a gel from the sodium silicate solution.

Hello, FYI, I used white rice husk ash as a silica source for my aerogel. For supercritical drying, I add 6 litre of absolute ethanol for 1.5 litre of ethanol-soaked alcogel in the drying chamber. The temperature and final pressure of the drying process is around 275 degree C and 1400 psi. I have done this several times, and the results are WHITE aerogel powder (attached image). Although the powder is white, it still shows some basic properties of aerogel such as low density, hydrophobic .. however, I just want to know if there any method to change the color of my aerogel powder? Thanks in advance.

Anyone here can do astral travel? Please tell me your experience.

Actually i use this product since 3 years ago. But just recently i feel very uncomfortable after using Listerine. My cough become more worst if i stay in air-conditioning room. Yes, i found ethanol in Listerine. May be the drying effect of ethanol cause me wanna cough. I also found Acid Benzoic in its ingredients. Wow Acid + alcohol in Listerine. How can FDA guarantee this product is safe?

When i use Listerine my throat feel very itchy and make me want to cough. I need to drink a lot of fresh water to relieve cough.

Yes, my government is corrupt. Corrupt in economy, corrupt in power, corrupt in freedom, corrupt in election and corrupt in moral.

Timo: Your guess is right! But i don't ever use Google Scholar before. h_i: Yes, WoS is more complicated compared to SCOPUS but SCOPUS had many non-english articles. I'm from Malaysia and it was really hard to find articles written in my language in WoS. Yes, i agree that we should better use both than pick only one. But the problem is, when i write a paper, people always ask which database i'm using. It hard to explain why i'm using this and why i'm not using that because i don't even know which one is better.

Hi, i guess some of us here are student or maybe academicians.. so if you are, please feel free to share your thought.

We know that Al tends to form amorphous oxide layer when exposed to atmosphere at room temperature. But what if the reaction of Al and O2 happen in very low pressure and high temperature? will the Al2O3 formed as crystalline?

Yes, i agree with both of you. But because the impact factor calculation is a mean, it doesn't means all papers have same number of citations. Like my friend's paper have 4 citations and mine still zero, but when it comes to IF, both of us will have IF of 2. In future, the citations of my friend's paper will keep increase (because of its quality) and mine will maintain zero (noob paper) but nevertheless, our IF is still equal..

Do you have any opinion on this? I think impact factor is a something unfair because article is judge on the number of citation but not on it's quality.

This form of corrosion is blistering. My dad's car also have same problem. Blistering occur due to adhesion problem between paint and steel. A very small space gap between paint and steel is enough to initiate rust.

You can stop further rust on the surface but not guaranteed to stop internal rust if moisture still present in that metal (like between cracks)

What melting points? the sand or the metals?

That's scary.

Hi, actually i don't know what section in this forum should i ask this kind of help. But to anyone who have direct access to Applied letter physics and also Journal of Applied physics can you PM me your email? I'm asking your kindness to help me to download several research paper which are out of subscription for my college, especially the papers in ALP and JoAP. As for exchange you can also call me for help if you have same problem. May be i can help you out if my college subscribe the papers you want. My email zulhelmialif@gmail.com thanks http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5146290&abstractAccess=no&userType=inst anyone can dload this for me??

The question is too general, i think we should evaluate base on engineering discipline because engineers don't work alone to design and build a things.. Ok, in automotive engineering i think it was very competitive. But from my personal opinion, italian engineers are the best. May be second for Japanese

Simply i say no

I'm confidently say time traveling is impossible. If human really want to travel through time i challenge them to create a 4D space first. For me, only God can control time.

I'm not sure what are pipes are usually made of, but carbon steel pipes are brittle at low temperature, see what happen to Titanic, the ship got divided into two parts when getting hit with iceberg.. the rising pressure inside the pipe due to freezing water should be the second reason of the failure.

Q: I have AISI 304 Stainless steel as a base metal for thin film deposition. The main alloying elements except of Fe are Cr (18%) and Ni (8%). So, i've coated the steel with pure Si using sputtering method. Then i use heat treatment to obtain intermetallic phase between film-substrate. So i just want to know between Cr and Ni, which one is more tend to react with Si beside Fe??.

good idea, but can the engine withstand the heat from super heated plasma? To create a huge thrust i believe we need to heat the plasma to some million kelvin isn't it. Plasma has less mass compared to hot air.. hence produce less thrust. Rocket move in zero gravity space, so using plasma should be no problem.. but for a jet which already have a tonne weight, this is the major drawback isn't it?