Scientific blog
August 
Friday, 31 August, 2012, 13:32
Posted by Piotr Drzymala
Attempts were made to embossing pattern on a copper disc, completed only a partial success. Due to the high melt of the strong deformation pattern is only partially extruded. However, it was discovered the cause of this difficulty - an outside company doing the matrix does not leave room for the flow of the material during deformation, which is why it has failed to do our prototype in a proper manner. In a further step we modify the template and will attempt embossing pattern. However, two discs prepared with outlines of designs. Since the earlier attempt to create a mirror of the first disk failed, perhaps due to the large curvature of the mirror, or due to a small increase in the electron density caused by insufficiently strong deformation, treated steel segment of curvature smaller ball for the second disc bending previously prepared by careful polishing .
view entry ( 281 views )   |  print article
PhD scientific blogging PCzaja 
Friday, 31 August, 2012, 11:53
Posted by Pawel Czaja
While August was dissolving into a distant memory I designed new compositions of my alloys (Ni-Mn-Sn). This is to study the influence of valence electron concentration on martensititic start tarnsformation temperature within a concentration range that seems to be uncharted according to literature. The compositions are set and now all that needs to be done is the casting.
view entry ( 219 views )   |  print article
PhD report G. Kulesza (June'12 & July'12) 
Monday, 27 August, 2012, 12:15
Posted by Grazyna Kulesza
In June I had a two-week research internship at the Wroclaw University of Technology. On the internship I was testing a new alkaline texturing solution based on digestion with KOH and dihydric alcohols. In July, I attended a conference Junior Euromat addressed to students and young researchers. At the conference, I had the opportunity to see the latest developments in the field of materials science.
view entry ( 227 views )   |  print article
viscosity of liquids MTrybula(Aug12) 
Monday, 20 August, 2012, 14:28
Posted by Marcela Trybula
Theoretical description of viscosity of liquids in terms of pseudopotencial approach and no-equilibrium molecular dynamics. Definition of viscosity based on theory free atom.
view entry ( 238 views )   |  print article
July raport (HK)  
Tuesday, 14 August, 2012, 15:43
Posted by Honorata Kazimierczak
In July I continue potentiostatic deposition of Zn-Mo layers from the following citrate solutions :
1) 0,65 M Na3HCit + 0,16 M ZnSO4 + 0,24 M Na2MoO4 + 0,1 g PEG +0,01 g SDS; pH=5
2) 0,45 M Na3HCit + 0,16 M ZnSO4 + 0,24 M Na2MoO4 + 0,1 g PEG +0,01 g SDS; pH=5
3) 0,45 M Na3HCit + 0,16 M ZnSO4 + 0,24 M Na2MoO4; pH=5
4) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,24 M Na2MoO4 + 0,1 g PEG +0,01 g SDS; pH=5
5) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,24 M Na2MoO4; pH=5
6) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,08 M Na2MoO4 + 0,1 g PEG +0,01 g SDS; pH=5
7) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,04 M Na2MoO4 + 0,1 g PEG +0,01 g SDS; pH=5
8) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,02 M Na2MoO4 + 0,1 g PEG +0,01 g SDS; pH=5
9) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,1 g PEG +0,01 g SDS; pH=5
10) 0,25 M Na3HCit + 0,08 M SnSO4 + 0,1 g PEG +0,01 g SDS; pH=5
11) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,04 M SnSO4 + 0,1 g PEG +0,01 g SDS; pH=5
12) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,08 M SnSO4 + 0,1 g PEG +0,01 g SDS; pH=5
13) 0,25 M Na3HCit + 0,16 M ZnSO4 + 0,08 M SnSO4; pH=5
14) 0,25 M Na3HCit + 0,08 M ZnSO4 + 0,16 M SnSO4 + 0,1 g PEG +0,01 g SDS; pH=5
with the following parameters:
-potential of a working electrode:
E1= -1,2 V
E2= -1,25 V
E3= -1,3 V
E4= -1,35 V
E5= -1,4 V
E6= -1,45 V
E7= -1,5 V
E8= -1,6 V
E9= -1,7 V
E10= -1,8 V
E11= -1,9 V
E12= -2,0 V
E14= -2,2 V vs.SCE
-rotating disc electrode speed:
ω1= 16 rad/s
ω2= 40 rad/s
ω3= 68 rad/s
-charge:
Q1= 25 C
Q2= 50 C
Q3= 100 C
Q4= 150 C
Q5= 250 C
Next the chemical composition of electrodeposits were characterised by the Wavelength Dispersive X-ray Fluorescence method (WDXRF), and the Glow Discharge Optical Emission Spectroscopy method (GDOES). Next I prepare, among others, partial polarizaion curves for the Zn, Mo ,H co-discharge.

view entry ( 249 views )   |  print article

<<First <Back | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | Next> Last>>