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Register a new userstudy of electrical and thermal stress impacts on electrical and optical characteristics of white organic light emitting diodes
دراسة تأثيرات الإجهاد الكهربائي والحراري على الخواص الكهربائية والضوئية للديود العضوي المشع للضوء الأبيض
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Aِl-Baath University رسالة ماجستير
Publication date
2017
and research's language is
العربية
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Shamra Editor
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نالت الديودات العضوية الباعثة للضوء خلال العقدين الماضيين اهتماماً واسعاً بسبب استخداماتها المتعددة سواء في مجال صناعة شاشات العرض ( تلفزيونات , شاشات الهاتف النقال , الساعات الرقمية ) أو في مجال الإضاءة الداخلية .
Over the past two decades, organic light-emitting LEDs have gained wide attention due to their multiple uses, whether in the field of display screens (televisions, mobile phone screens, digital watches) or in the field of indoor lighting.
References used
M. Mazzeo, Organic Light Emitting Diode, India : Sciyo. 2010
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After that automation electrical power transfer stations towards to
use intelligent electronic devices that are performing multiple
functions : process protection, monitoring, control and use
private companies manufacturers of equipment communicat
ion
protocols, so that need to build electrical smart grid that coordinate his parameters and support his devices.
Search begins definition electrical smart grid and its importance,
and includes the benefit of this electrical smart grid, the requirements and the careers then the specifications of electrical
smart grid, at the end of the search: we compare between the
electrical power transfer stations in electrical traditional grid and
electrical smart grid.
Paper Find the possibility of interpreting the vertical electrical sounding curves in real field , having been reached resistivity virtual account through the equation is valid for all configurations
V(r)=I/2 πr[C1pn+T() + C2p1]
Search results
provide a lot of time and effort in processing and interpretation of the geoelectrical data , and reflected positively on the interpretation of the vertical electrical sounding academic and an applied.
Ceramic Sample of tin doped pure barium titanate prepared by solid-state reaction at
a sintering temperature of 1350˚C for 3.5h. The electrical properties of ceramic BaTi1-
xSnxO3 studied for the ratios (x= 0, 0.05, 0.07, 0.1, 0.12, 0.15, 0.17), as
a function of
temperature from 0˚C to 170˚C at 1kHz. The maximum value of the dielectric constant
reached to έ=6568 for the content x=0.1 at the temperature Tc=50˚C. The phase transition
for barium titanate was of the first type with γ=1.07. The degree of the transition changed
by increase the ratio of added tin. Where the maximum value of transition degree γ=1.46 at
the ratio x=0.15. Curie constant decreases with increasing ratios of tin added to the ceramic
samples.
Ceramic samples of calcium doped barium titanate have been prepared from highpurity
raw materials by using solid-state reaction method at a sintering temperature of
1350˚C for 3.5h. The electrical properties of ceramic samples Ba1-xCaxTiO3 have bee
n
studied for the ratios (x = 0, 0.1, 0.3, 0.5, 0.7, 1), as a function of temperature within the
range of 25˚C to 220˚C at the frequency 1kHz. Experimental results show that the Currie
point moved within the temperature range from 120˚C to 150˚C by change of calciumadded
ratios. Dielectric constant decreases by increasing the calcium-added ratios. The
maximum value of the dielectric constant rached to έ=6898.85 for barium titanate at the
temperature Tc = 132˚C. We got the high values of the tangent loss angle at both ends of
the studied temperature range. Curie constant decrease of the samples by increasing the
additional calcium ratios.
In order to improve the performance of transformers in highvoltage
networks and re-electrical characteristics of insulation
materials for these transformers to the nominal accepted value,
methods of technical and new process are appeared to re-qua
lify
insulation transformers in their work sites in electrical transfer
stations without having to transport them to workshops or to
laboratories factory .
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