Special Features 12/2/2015

It's time for a new batch of special features.
Check out these wonderful works

New promotions

http://fineartamerica.com/weeklypromotion.html?promotionid=182726



http://fineartamerica.com/weeklypromotion.html?promotionid=182725

Contest Winners

Another day, another contest!
Here are the wonderful works that tied for places 1-4 in the "Dreaming in Black and White" contest!
You can see all the works at the link below. Congrats to the winners!

http://fineartamerica.com/contests/dreaming-in-black-and-white-panoramic-images-only.html?tab=artwork

Promotion

For a limited time, you can get a beautiful canvas of one of my photos at a discount. Follow the link to the promotion page

http://fineartamerica.com/weeklypromotion.html?promotionid=181247



http://fineartamerica.com/weeklypromotion.html?promotionid=181251

New contest

A new contest for black and white panoramas

http://fineartamerica.com/contests/dreaming-in-black-and-white.html?tab=overview

Weekly special features!

A new batch of amazing work in my group! Enjoy!

Special features

New special features on the group home page.
Congrats!

First contest winners

We've just finished the first contest in the group I manage. The theme of the contest was "Vertical Panorama".
Here are the winners. Congratulation on your outstanding work!

Sharing first and second place:





Sharing 3rd and 4th place:





And just because I like them as well, places 5-7:

More Sponsored Pages

Some more sponsored pages

jerusalem prints for sale

israel art for sale

nature canvas prints and nature canvas art for sale

nature prints for sale

nature photographs for sale

closeup prints for sale

closeup canvas prints and closeup canvas art for sale

closeup photographs for sale

nature photographs for sale

Weekly Features

A new batch of wonderful artworks at the Pano-Whamma Outdoors. Enjoy!

Weekly special features

From now on, I am starting a series of weekly posts to promote some of the amazing artwork I special feature in the group I manage at the FineArtAmerica
So, here goes! Please, go visit the website.

Photography

It's been a while... In fact, it's been far too long since I posted.
Many things happened since then, and I hope I will start posting more regularly (aren't I always saying this?).

Anyway, I started selling my photographs on-line. You can find the link to my website selling the images at the link below.

http://dimitry-papkov.artistwebsites.com/

I am planning from time to time to promote the community selling the artwork.And I will start right now :-)

Please, visit the linked pages for some amazing artwork (not necessarily mine). In addition to more traditional prints and canvas prints (did I mention those look amazing?) hey have all kinds of cool stuff like tote bags, phone cases, shower curtains etc. So, go! You know you want some :-)

macro throw pillows for sale

macro greeting cards for sale

macro canvas prints and macro canvas art for sale

landscape canvas prints and landscape canvas art for sale

Musing for the end of the year

So, I've decided I will try and post a bit more on the blog and include some more general musings. Not sure I will be able to do this, but we'll see. I will still be staying out of politics and economic discussions though :-)

Anyway, a few days ago I spent more than half a day listening to music on Youtube. I am not entirely sure how i got to this, but I think it started with the minions from the Despicable Me movies. It was a somewhat long line of free associations and I eventually ended up listening to a bunch of 70's-80's music. Much of it was not what you'd usually expect, but things that were pretty popular in USSR when I was growing up. Much of the songs are in Italian and French. Besides making me feel somewhat like an old fart, it also led me to some rather interesting things I haven't listen in depth to before. For example, I spent a lot of time listening to different versions of Vivo per lei by Andrea Bocelli (see links at the end of this post. i was somewhat surprised that I liked the German and the French versions the best. Especially surprising was the German version, since German is usually considered a somewhat harsh language. So, kudos to Judy Weiss. Obviously, in all these versions Bocelli's partner has a beautiful voice, but for some reason both of the English versions didn't speak to me too much, and I liked the Spanish one the least.

As a result of all of this, I will be buying a couple of Bocelli's albums as a present to myself for the end of the year :-)

Cheers all and enjoy

The 70s/80s mix
http://www.youtube.com/watch?v=szWSLwkYa6k&list=RDQ0wZQbK938Y&index=1

Vivo per lei original version (Italian)
https://www.youtube.com/watch?v=y6MhjhMtq7s

French version
https://www.youtube.com/watch?v=BpAgfw4j5SU

German version
https://www.youtube.com/watch?v=3IyYqJyc-zk

Spanish version
https://www.youtube.com/watch?v=XNvGghuoJUo

English version #1
https://www.youtube.com/watch?v=vOfadmFfuPc

English version #2
https://www.youtube.com/watch?v=WdxRmcgsKDQ

Small addition to previous post

It turns out that our image not only featured in the top images for 2013 by Nature, but was actually also used as cover for their 2013 summary.
Cheers all
http://www.nature.com/news/specials/2013-1.14378

Updates

I know, I know, it's been a long while since I last posted. I could probably launch into explanations as to why that is, but I won't.

So, a few things happened lately that require some updates. First of all, I passed my comprehensive exam and was officially accepted into candidacy for PhD. I had fun writing the written proposal since it was on the subject that I would like to research in real life if/when I get a faculty position. This last semester I also sat in a class on grant writing and it was very helpful in preparations for the comprehensive.

I also received a fellowship from the Nebraska Center for Materials and Nanoscience (NCMN), with a small press release on the subject. Always good for ego-stroking.

On with the updates!

The paper in Advanced Functional Materials finally got out in an issue (as opposed to a preliminary view). In addition, it got to be a front piece with an image designed by Joel Brehm.



The paper also received a press release from UNL, which is always nice.

Surprisingly, we got a very nice present for the end of the year, as our image was included among the images of the year by Nature. I think I will take this opportunity to post that nice image again :-)


I think that's about it for now. Hopefully, this blog will have more good news in the next year. Happy holidays to those who might happen to read this.

Cheers all

Paper out at last

The paper in the Advanced Functional Materials is out at last (at least on the Internet). It can be found here.

Over at last

Well, it is about time. The semester is officially and finally over for me since all the grades had been posted. More importantly, I am done with classes I am required to take for my degree. It wasn't easy going back after so many years. Not so much in terms of problems of handling the classes (I did rather well in that respect), but psychologically adjusting. Part of it is the fact that my perspective and knowledge shifted significantly during the many years I worked. Another part is the fact that the other people in the class are significantly younger and in many cases have no major experience outside of academia. Well, anyway, it is done. Now, it's just the matter of doing the research and defending. And, doing the comprehensive exam, of course :-)

Hilarity ensues

Well, it was only a matter of time with the publicity surrounding the paper. Those who can read Russian are welcome to check out the link. The problem, of course (beyond the rather sensationalist coverage), is that I have as much to do with Russia as with ballet. I was born in Ukraine when it was still a part of USSR. I came to Israel with my parents when I was a child of 13 (USSR still existed at the time). So, any connection to Russia is, as they say, purely coincidental :-). Incidentally, it is interesting that they didn't try to claim Dr. Dzenis as having connection with Russia, though he left the USSR as an adult and has a PhD from Riga University. Then, there is the claim that I have a Masters in EE. I wish. I tried to start Masters in EE when I was in the army. Unfortunately, it didn't work out and I only took a few courses. And, finally, we are obviously not from Akron. Only Dr. Cheng who is a coauthor on the paper is. I guess these reporters at least tried to find out a bit about us (most likely found my Linked-in profile). It is more than I can say about other articles. In most cases people very obviously didn't read the paper, but only the JournalStar article or even subsequent coverage (it is like watching a children's game of "broken phone"). It is funny nonetheless.

Some explanations about the paper

Well, given the increased attention and articles about our recent paper, I decided to write a short explanation of what it actually says and the implications for those who are interested but can't read the paper behind the paywall or not interested in wading through it.

First, a short description of what was done. We used electrospinning to produce continuous fibers with diameters between ~100 nanometers and a few microns (for comparison, human hair is about 100 microns in diameter). For those unfamiliar with the process, electrospinning, similar to electrospraying, applies high voltage to a solution of polymer (you can also use a polymer melt, but it's less versatile and more complicated). Above a certain polymer concentration this process produces fibers that are deposited on a collector (in regular cases it produces a random mat and you need a special electrode to produce oriented or individual fibers). The diameter of the fibers is controlled by different process parameters and can be as low as few nanometers for some polymer systems (in our case we tested fibers as thin as ~100 nanometers).

After making the fibers we mechanically tested them. Other people previously tested such nanofibers, but usually on very short samples (several tens of microns)and the examined diameter range was much narrower. What we saw was that the fibers became much much stronger as they got thinner. This is not entirely unexpected (there are theories that predict this effect), though the magnitude of this size effect was beyond what we've expected. What was unexpected that the deformation to failure did not decrease with the increase in strength, which led to smaller fibers being able to absorb significantly more energy (expressed as toughness) than the large ones (toughness is the area under the stress/strain curve).

Now, optimally, one would have liked to examine the structure of individual nanofibers, but examining crystal structure of such small samples is rather difficult (especially for polymers). We examined crystallinity of nanofiber mats (with distribution of diameters) and found that it decreased slightly for mats with thinner average diameter. This led us to hypothesize that our increase in toughness is associated with the low and decreasing crystallinity. In order to validate the hypothesis we intentionally increased crystallinity in our fibers by heating them up. After this process, we found that the deformation the fibers were able to take before breaking decreased significantly (and thus the toughness of the fibers decreased as well). We also made an effort in the other direction (to decrease crystallinity), and found, as expected, that the toughness increased, but there were confounding effects and we decided to leave this part of the experiments for future papers.

Now, for the claims out there and for the implications of our study. As it stands, taking the fibers and using them is still a long way off. Controlling the diameter and scaling things up is not trivial. Furthermore, though the strength of our fibers is relatively high for the thinnest filaments, it is just starting to push the advanced fibers which are used in composites, armor etc. The bigger problem though is that the large toughness comes from large deformations, which is not very useful for many applications (in ballistics, for example, you are interested in the first 10% deformation and how much energy you absorb there). So, while the results are promising, it is waaay too early to talk about shirts that can stop bullets :-) The study does offer some possible paths forward. I don't want to go into too much details here, but there are possibilities to try and tailor the properties, by sacrificing some of the toughness at high deformations to get higher strength etc. In addition, the discovery that the low crystallinity might be a good thing is very unusual and goes against what people regularly do to produce advanced fibers. I hope this helps to clear some of the clutter out there. Or maybe it just confuses people who ventured here to read this post even more :-)

Now this is getting silly

Well, not so much silly, but definitely an uncharted territory for me. Literally almost two dozen different versions of news coverage of the paper are out, and new ones popping up all the time. https://news.google.com/news/story?pz=1&cf=all&ned=us&hl=en&topic=snc&ncl=d1_FY25uvPAQoAMBjzQeUH9jrgZgM&cf=all&scoring=d