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Online since: December 2009
Authors: Mariam Al-Ma'adeed, M. Bader, N.J. Al-Thani
Crystallization behavior of ultrahigh
molecular weight polyethylene as a function of in vacuo [gamma]irradiation
Macromolecules, 2001; 34: 896-906.
10.
Phys, Chem, 1995; 46:893-896. 1st Heating No irradiation Temperature ( 0C) 80 100 120 140 Heat Flow (J/g) 10 20 30 40 50 60 70 Virgin After aging 1st Heating 5kGy Temperature ( 0 C) 80 100 120 140 Heat Flow (J/g) -40 -20 0 20 40 60 80 as irradiated After aging 1st Heating 100 kGy Temperature ( 0C) 80 100 120 140 Heat Flow (J/g) -20 0 20 40 60 80 As irradiated After aging (a) (b) (c) 1st Heating 200kGy Temperature ( 0C) 80 100 120 140 Heat Flow (J/g) -40 -20 0 20 40 60 80 As irradiated After aging Fig. 1 DSC thermograms of the first heating cycle of unirradiated, as irradiated and aged UHMWPE for (a) virgin (b) 5kGy (c) 100 kGy and (d) 200 kGy (d) 1st heating Dose, kGy 0 100 200 300 400 500 Crystalinity% 40 45 50 55 60 65 70 75 After irradiation After aging Fig.2 Variation of the crystallinity percentage with the irradiation
Phys, Chem, 1995; 46:893-896. 1st Heating No irradiation Temperature ( 0C) 80 100 120 140 Heat Flow (J/g) 10 20 30 40 50 60 70 Virgin After aging 1st Heating 5kGy Temperature ( 0 C) 80 100 120 140 Heat Flow (J/g) -40 -20 0 20 40 60 80 as irradiated After aging 1st Heating 100 kGy Temperature ( 0C) 80 100 120 140 Heat Flow (J/g) -20 0 20 40 60 80 As irradiated After aging (a) (b) (c) 1st Heating 200kGy Temperature ( 0C) 80 100 120 140 Heat Flow (J/g) -40 -20 0 20 40 60 80 As irradiated After aging Fig. 1 DSC thermograms of the first heating cycle of unirradiated, as irradiated and aged UHMWPE for (a) virgin (b) 5kGy (c) 100 kGy and (d) 200 kGy (d) 1st heating Dose, kGy 0 100 200 300 400 500 Crystalinity% 40 45 50 55 60 65 70 75 After irradiation After aging Fig.2 Variation of the crystallinity percentage with the irradiation
Online since: July 2010
.
___________________________________________________________________________
Elisabetta ARCA
Ph.D student
Trinity College, School of Physics, Dublin, Ireland
earca@tcd.ie
Phone : +353.1.896.38.08
Elisabetta Arca was born in Sassari in 1984.
Igor SHVETS Professor of Applied Physics Trinity College, School of Physics, Dublin, Ireland http://www.tcd.ie/Physics/applied-physics ivchvets@tcd.ie Phone : +353.1.896.16.53 Fax : +353.1.671.17.59 Igor Shvets graduated from the Institute of General Physics at the USSR Academy of Science in 1989.
Igor SHVETS Professor of Applied Physics Trinity College, School of Physics, Dublin, Ireland http://www.tcd.ie/Physics/applied-physics ivchvets@tcd.ie Phone : +353.1.896.16.53 Fax : +353.1.671.17.59 Igor Shvets graduated from the Institute of General Physics at the USSR Academy of Science in 1989.
Online since: September 2016
Authors: A. Praveen Kumar, K. Kurien Philips, J. Ashwin, M. Nalla Mohamed
The band at 1239 cm–1 shown is relative to the (C-O) vibration of esters, ethers and phenolic groups attributed to the presence of lignin on the fibersurface.Finally, the peak observed at 896 cm–1 is attributed to the presence of b-glycosidic linkages between the monosaccharide.
It is also observed from peak 896 cm–1 that, the ether group was present after mercerization and there were no significant changes before and after fibers being treated by NaOH.
It is also observed from peak 896 cm–1 that, the ether group was present after mercerization and there were no significant changes before and after fibers being treated by NaOH.
Online since: August 2013
Authors: Li Na Zhou, Jia Dong Shang, Lan Yang
Multipliers needed in RFT and FFT
Signal
length
Multipliers in RFT(IRFT)
Multipliers in FFT
RFT Reduction(compared to FFT)
2
1(0)
2
50%
4
5(2)
8
37.5%
8
14(6)
24
41.7%
16
34(18)
64
46.9%
32
76(44)
160
52.5%
64
172(108)
384
55.2%
128
380(252)
896
57.6%
256
834(578)
2048
59.3%
512
1810(1298)
4608
60.7%
1024
3912(2888)
10240
61.8%
Ramanujan sums and Ramanujan Fourier transforms
Ramanujan sum is a function of two positive integer variables q and n defined by the formula:
(1)
where (p, q)=1 means that p and q are coprime.
Online since: February 2011
Authors: Jin Li, Li Bin Xia, Qian Liu
Table 1 The structural parameters of knitting fabrics
Fabrics structural
Thickness
(mm)
Wale density
(course/5cm)
Course density (wale/5cm)
Dry weight per unit area (g/m2)
The length of loop (mm)
Opening percentage
Plain(P1)
1.15
28
32
896
0.71
3.90
Plain(P2)
1.11
25
31
775
0.78
4.28
Plain(P3)
0.92
24
30
750
0.8
4.41
The Preparation of composite materials
Polyurethane foam plastics and composite materials with two different thicknesses were prepared respectively by using reaction injection molding method.
Online since: May 2013
Authors: Rui Gao, Ling Qiang Yang, Hong Wu Zhang, Yan Wang
Table 1 Result of chemical composition of water in field engineer
N.O
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SO42-[mg/l]
502
332
333
704
533
451
931
526
403
705
466
432
153
1680
802
1261
C11-[mg/l]
196
123
117
326
200
159
541
221
137
377
235
188
31
896
397
579
Mg2+[mg/l]
55.8
42.7
41.2
57.3
44.8
42.2
63.1
22.4
32.8
62.1
36.5
35.4
8.3
51.1
36.5
41.7
pH
7.58
7.64
7.52
7.97
7.35
7.58
7.45
7.84
7.50
7.52
7.73
7.58
7.46
7.50
7.45
7.40
Microstructure Analysis
Some scanning photos were selected from fail samples shown in figure 1 and figure 2.