PresenWide Bandgap Semiconductor Materials for Improved Performance Microwave...Realsim, Fanavaran Sharif
Wide bandgap semiconductors such as SiC (Silicon Carbide), GaN
(Gallium Nitride) and related heterostructures are characterised by
a much higher breakdown voltage and therefore they may allow fabrication of devices with an order of magnitude improved RF output power compared to traditional solid state devices.
PresenWide Bandgap Semiconductor Materials for Improved Performance Microwave...Realsim, Fanavaran Sharif
Wide bandgap semiconductors such as SiC (Silicon Carbide), GaN
(Gallium Nitride) and related heterostructures are characterised by
a much higher breakdown voltage and therefore they may allow fabrication of devices with an order of magnitude improved RF output power compared to traditional solid state devices.
Sol gel synthesis and characterization of lithium yttrium oxideeSAT Journals
Abstract Lithium yttrium oxide LiYO2 was synthesized for the first time by a simple citric acid-assisted sol-gel method. Three different molar ratios from low to high concentration of lithium precursor were used. The higher lithium precursor content provided purer LiYO2 powders, which were obtained by calcining the amorphous powders from the sol-gel process at lower temperature, compared to those synthesized by solid-state reaction. The optimum experimental conditions for sol-gel preparation process is 1:3 and 1:2 molar ratio of [Li(CH3COO]∙2H2O]/[Y(NO3)3∙6H2O] at 950°C and 1000°C respectively, with 6 hours of holding time. The reaction and synthesis mechanism for LiYO2 was analyzes and proposed. It was found that the calcination of dried gel generated exothermic reactions and synthesize of LiYO2 was performed by simple reaction of Li2O and Y2O3. Keywords: Lithium yttrium oxide (LiYO2), Sol–gel synthesis, mechanism.
X-ray photoelectron spectroscopy (XPS) or Electron spectroscopy for chemical analysis (ESCA) is used to investigate the chemistry at the surface of the samples. The basic mechanism behind an XPS instrument is that the photons of a specific energy are used to excite the electronic states of atoms at and just below the surface of the sample.
There are several areas suited to measurement by XPS:
1. Elemental composition
2. Empirical formula determination
3. Chemical state
4. Electronic state
5. Binding energy
6. Layer thickness in the upper portion of surfaces
XPS has many advantages, such as it is is good for identifying all but two elements, identifying the chemical state on surfaces, and is good with quantitative analysis. XPS is capable of detecting the difference in the chemical state between samples. XPS is also able to differentiate between oxidations states of molecules.
XPS has also some limitations, for instance, samples for XPS must be compatible with the ultra high vacuum environment. XPS is limited to measurements of elements having atomic numbers of 3 or greater, making it unable to detect hydrogen or helium. XPS spectra also take a long time to obtain. The use of a monochromator can also reduce the time per experiment.
This is a power point presentation of project work on preparing Zinc oxide thin films by using SILAR technique and CBD technique and studying its characteristics.
PRESENTATION OUTLINE
Introduction,History of Nanotechnology,What is Nanotechnology, Definition of Nano,History of Graphene,Graphene,Why Nanotechnology,Size of Nanotechnology,What is Graphene, Properties of Graphene,Graphene Structure,Types of Graphene ,Synthesize Graphene,Applications,Conclusions,References
السلام عليكم ورحمة الله وبركاته
محاضرة هامة جداً
#ماذا_تفعل_في_حالة_الحريق
#fireaction
#EmergencyActionPlan
How to use #fireextinguisher
بشكل بسيط ومعلومات قيمة باللغة العربية والانجليزية
بفضل الله تعالى
أخذت مجهود كبير من البحث والتأليف والتصميم
يمكن مشاركتها لتعم الفائدة والاجر
مع الاحتفاظ بحقوق الملكية الفكرية وعدم ارالة الاسم منها
يوجد شرائح تصلح لملصقات توعية منفصلة في #السلامة من الحرائق و #الاخلاء في حالة طوارئ #الحريق ومكافحة الحريق و #طفاية_الحريق انواعها وانواع الحرائق ومسبباتها
لاي معلومات ولتقديم المحاضرة مجانا يمكنكم التواصل على الخاص
نحتسب الأجر في ميزان حسنات والدينا رحمهم الله تعالى
Sol gel synthesis and characterization of lithium yttrium oxideeSAT Journals
Abstract Lithium yttrium oxide LiYO2 was synthesized for the first time by a simple citric acid-assisted sol-gel method. Three different molar ratios from low to high concentration of lithium precursor were used. The higher lithium precursor content provided purer LiYO2 powders, which were obtained by calcining the amorphous powders from the sol-gel process at lower temperature, compared to those synthesized by solid-state reaction. The optimum experimental conditions for sol-gel preparation process is 1:3 and 1:2 molar ratio of [Li(CH3COO]∙2H2O]/[Y(NO3)3∙6H2O] at 950°C and 1000°C respectively, with 6 hours of holding time. The reaction and synthesis mechanism for LiYO2 was analyzes and proposed. It was found that the calcination of dried gel generated exothermic reactions and synthesize of LiYO2 was performed by simple reaction of Li2O and Y2O3. Keywords: Lithium yttrium oxide (LiYO2), Sol–gel synthesis, mechanism.
X-ray photoelectron spectroscopy (XPS) or Electron spectroscopy for chemical analysis (ESCA) is used to investigate the chemistry at the surface of the samples. The basic mechanism behind an XPS instrument is that the photons of a specific energy are used to excite the electronic states of atoms at and just below the surface of the sample.
There are several areas suited to measurement by XPS:
1. Elemental composition
2. Empirical formula determination
3. Chemical state
4. Electronic state
5. Binding energy
6. Layer thickness in the upper portion of surfaces
XPS has many advantages, such as it is is good for identifying all but two elements, identifying the chemical state on surfaces, and is good with quantitative analysis. XPS is capable of detecting the difference in the chemical state between samples. XPS is also able to differentiate between oxidations states of molecules.
XPS has also some limitations, for instance, samples for XPS must be compatible with the ultra high vacuum environment. XPS is limited to measurements of elements having atomic numbers of 3 or greater, making it unable to detect hydrogen or helium. XPS spectra also take a long time to obtain. The use of a monochromator can also reduce the time per experiment.
This is a power point presentation of project work on preparing Zinc oxide thin films by using SILAR technique and CBD technique and studying its characteristics.
PRESENTATION OUTLINE
Introduction,History of Nanotechnology,What is Nanotechnology, Definition of Nano,History of Graphene,Graphene,Why Nanotechnology,Size of Nanotechnology,What is Graphene, Properties of Graphene,Graphene Structure,Types of Graphene ,Synthesize Graphene,Applications,Conclusions,References
السلام عليكم ورحمة الله وبركاته
محاضرة هامة جداً
#ماذا_تفعل_في_حالة_الحريق
#fireaction
#EmergencyActionPlan
How to use #fireextinguisher
بشكل بسيط ومعلومات قيمة باللغة العربية والانجليزية
بفضل الله تعالى
أخذت مجهود كبير من البحث والتأليف والتصميم
يمكن مشاركتها لتعم الفائدة والاجر
مع الاحتفاظ بحقوق الملكية الفكرية وعدم ارالة الاسم منها
يوجد شرائح تصلح لملصقات توعية منفصلة في #السلامة من الحرائق و #الاخلاء في حالة طوارئ #الحريق ومكافحة الحريق و #طفاية_الحريق انواعها وانواع الحرائق ومسبباتها
لاي معلومات ولتقديم المحاضرة مجانا يمكنكم التواصل على الخاص
نحتسب الأجر في ميزان حسنات والدينا رحمهم الله تعالى
مقدمة عن لغة بايثون.pdf-اهم لغات البرمجةelmadrasah
تعتبر لغة البرمجة بايثون من أشهر لغات البرمجة في العالم بفضل تصميمها البسيط وسهولة تعلمها، مما يجعلها خيارًا ممتازًا للمبتدئين والمحترفين على حد سواء. تأسست بايثون في أواخر الثمانينات من القرن الماضي على يد المبرمج الهولندي جيدو فان روسوم، ومنذ ذلك الحين تطورت لتصبح واحدة من أكثر اللغات استخدامًا في مجالات متعددة، بدءًا من تطوير الويب وحتى تحليل البيانات والذكاء الاصطناعي.
37. References املصادر
[1]. L. B. Freund,2003,” Thin Film Materials”.
[2]. G.L. Messing et al. ,” Thin Film of Materials”.(1993)
[3]. L. Bayvel and Z. Orzechowski, “Liquid Atomization”, 1993
[4]. W.S. Moon et al., (1999) ,”physical of Thin Film” .
[5]. T. T. Kodas and M. Hampden-Smith, 1999,
“Aerosol Processing of Materials”.
[6]. R. W. Wood and A. L. Loomis, 1927,” Phil. Mag.”.
[7]. R. J. Lang, 1962,” Acoustical Soc”.
[8].M.A. Kaid and A. Ashour, (2007), “Preparation of
ZnO-doped Al films by spray pyrolysis technique”.
38. [9]. A. Al-Ahmadi, (2003), “Fabrication and
characterization of ZnO Film by Spray Pyrolysis and
ZnO Polycrystalline Sintered Pellets Doped with Rear
Earth Ions”.
[10] . ٌمؤيدٌجبرائيلٌيوسف
,
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,
"
ٌفيزياءٌالحالة
ٌٌالصلبة
"
،
ج،ٌمطبعةٌجامعةٌبغداد
1
[11]. E.Sirotin and M. Shaskolskaya, (1982),”Fundamental
of Crystal Physics”.
[12]. H.S.Bahidh , (2009) , " Optical and Structural
Properties of( ZnO_ SnO2) and their Mixture Prepared
by Chemical Spray Pyrolysis “,
[13]. O. Stenz-el, (2005),“The Physics of Thin Film
Optical Spectra.
[14]. Hua, H. Rui-Au, W. Gui-Qing (2002), W. C. Xuebao, Vol.
د
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صبحيٌسعيدٌالراوي
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39. [16]. S.Ilican, et al., (2008), “Polycrystalline indium-
doped ZnO thin films: preparation and
characterization”.