random craps...that is my life รำพึงรำพัน กระแสความคิดของปัจเจกชนบนโลกใบใหญ่

Wednesday, June 01, 2016

Jean Baudrillard (Stanford Encyclopedia of Philosophy)


Sunday, August 24, 2014


Best regards,
Nitipat Pholchai

Tuesday, May 19, 2009

Molecular Dynamics Software and DNA

A quick overview:


From here, a list of useful resources are provide....e.g. Erik Winfree group at Caltech is one

However, I'm not so sure if it is possible for one to read these stuffs and just pick it up

etc.... the problem is I don't know how to read or interpret the results

And then softwares:

Ascalaph  (extremely pretty-looking)
cadNano (strictly DNA origami)

Saturday, March 14, 2009

Nano Nano

Nano nano, what a wonderful surprise!
This is hilarious. can't believe my friend Pat and Ryan made this =-)

The Nano Song from nanomonster on Vimeo.

Thursday, February 19, 2009

Quantum Information links

With lecture notes, videos.
also check out the Quantum Control theory notes. it's quite comprehensible and insightful =)

Nitipat Pholchai

Tuesday, October 14, 2008

Er3+ ion in ZrO2, Y2O3, BaTiO3 (perovskite) nanocrystals has low-f TO modes and thus reduce multiphonon radiative process. enhancing up-conversion

Nitipat Pholchai

Interesting optoelectronics materials

And (yet) another abuse of ongarius blog for my personal research...

from P.N. Prasad, "Nanophotonics"

- block copolymer : color tunability with polymer length, PLED (Kyllo EM Synth. Met. 116, 189-192, 2001, Yang 1998), flexible aliphatic chain (spacer to enhance solubility), can comes in different morphologies like wrapped in sphere, multiphase, self-assembled to crystal etc. also white LED with multiple conjugated units
 e.g. PPV (poly-p-phenylene vinylene), cf. Park C. Polymer 44, 6725 (2003)
       electrically poled conjugated polymer by Langmuir-Blodgett Y-type deposition (hydrophobic interaction) and SAM (covalent) to enhance electro-optics effect, SHG
       cf. Wijekoon J. Am. Chem. Soc. 118, 4480-4483 (1996), Zhu P. van der Boom, Chem Mater 14, 4983-4989 (2002): superlattice with much higher electro-optic coefficients and lower refractive index than LBO, automatically noncentrosymmetric, compatible with Si
- dendrimer: site isolation of core (Lanthanide ion, where vibrational quenching of solvent is suppressed), energy funnels for light harvesting (enhanced emission, amplification or lasing from the core center via energy transfer from peripheral groups), modulation of interaction

-supramolecular structures: mesoporous foldmer with central hollow tube (cavity or template for other photonic materials), discotic polymers with strong chirality and enhanced interdisc pi-pi interaction

- rare-earth ion: f-->another f or f-->d orbital, interionic coupling, coupling with phonon mode. e.g. Er3+ in glass fiber amplifier.
   phonon interactions, multiphonon relaxation: depends on phonon density if state in host matrix (low frequency cut-off due to small size of nanostructure, another high-f cutoff), vibration amplitude, strength of el-ph coupling
   cross-relaxation, ion-ion interaction induces transfer of excitation energy between ions
   upconversion (photon avalanche): 1. excited state absorption leading to sequential absorption of same ions(why possible? not a third order process?) 2. energy transfer via ion-ion interaction 3. cooperative emission of two neighboring ions from a high-energy virtual state
   down-conversion (quantum cutting) 



Monday, October 13, 2008

Energy Storage Technologies

On the Energy storage side, there are several alternatives available
...have yet to compare and assess them (their economy). Batteries look like a viable one: simplest and cheapest? (but may be expensive in the long term)
at least you do not need an expert to maintain them.
....superconducting magnet (sure is hella interesting, for a physicist like me ;-)  

Nitipat Pholchai

Smart grid for distributed energy storage

It's been ages for not posting on my blog, despite having way so much going-on in my life (way too much than I can handle).

Anyway, here are some interesting resources for Smart Grid tech, for distributing electricity efficiently, reliably and securely. This is a part of my final project for the photovoltaic class, titled Capacity value of Distributed Energy Storage for PV. Basically we are trying to study the incentives of household and commercial solar generators to store and then feed in their generated power into the grid during peak hours (where electricity is most valuable). Of course the promise of this idea lies on many aspects, the electricity pricing system, legislation (which may become hard; note the the Feed-in Tariff is not an established entity yet in the US), and also on the technical side of how to store the energy with little loss. For energy and cost efficient distribution we may probably has to use Smart grid, which still has a long way to go on regional basis.
I'll see after reading these how it may work.

The untapped Value of Backup Generation