SOME POLYNOMIAL INEQUALITIES IN THE COMPLEX DOMAIN WITH PRESCRIBED ZEROS

في هذا البحث نقدم بعض المتباينات لمتعددة الحدود مع الأصفار المقيدة ، والتي هي تعميم و تحسين لبعض المتباينات المعروفة لمتعددات الحدود لكل من أنكيني وريفلين ،ديوان ،سينغ ومير، مير،واني وحسين وآخرين.In this paper certain polynomial inequalities with restricted zeros are given, which generalize and refine some well-known polynomial inequalities due to Ankeny and Rivlin, Dewan, Singh and Mir, Mir, Wani and Hussain and others

Synthesis and Catalase Mimic Activity of MnO2 Nano Powder Prepared by Hydrothermal Process

حضرثنائي اوكسيد المنغنيز النانوي بطريقة الضغط الحراري (الاوتوكليف). وتم تلدين ثنائي اوكسيد المنغنيز عند درجات حرارية مختلفة (250،400،550 و700م˚). اخذت القياسات للمساحيق النانوية ولمتغيرات متعددة ومن ثم شخصت البنية التركيبية وطوغرافية الاسطح بوساطة فحص حيود الاشعة السينيه ((XRD, مجهر القوه الذريه ((AFM و المجهر الاكتروني الماسح ((SEM. درست فعالية ثنائي اوكسيد المنغنيز كعامل مقلد لانزيم الكتليز (الفعالية التحفيزية) ضد بيروكسيد الهيدروجين وباستخدام طريقة جديدة ووجد ان التلدين بدرجة حرارة 400˚م هي الافضل.Manganese dioxide (MnO2) nanopowder has been synthesized by hydrothermal method. MnO2 was annealed at different temperatures (250, 400, 550, 700˚C). The crystal structure and surface morphology of these nanostructures were characterized by X-ray diffraction (XRD), Atomic Force Microscope (AFM) and Scanning Electron Microscopy (SEM). The catalase mimic activity (catalytic activity) of MnO2 against hydrogen peroxide (H2O2) was studied by using the new method and found that 400˚C is the best annealing temperature

Synthesis and Antibacterial Activity of Rutile-TiO2 ‎Nano Powder Prepared by Hydrothermal Process ‎

حضر اوكسيد التيتانيوم النانوي نوع روتايل (r-TiO2) بتقنية الحراره المائيه في الأوتكليف، حصل التفاعل بين رباعي كلوريد التيتانيوم ومزيج متكون من ماء لاايوني وايثانول بنسبة (37:) على التوالي. جفف الناتج ولدن عند 400 °م.  التركيب وطوبوغرافية السطح لاوكسيد التيتانيوم تم تشخيصها بواسطة قياسات حيود الاشعة السينية (XRD) ، المجهر الألكتروني الماسح (SEM), مجهر القوة الذرية (AFM) ومطيافية الأشعة تحت الحمراء (FT-IR) والأشعة فوق البنفسجية/المرئية (UV/Visible). تم دراسة تاثير الاوكسيد المخصر على نوعين من البكتريا الغرامية السالبة (Escherichia coli) والموجبة (Staphylococcus aurous ). بينت الدراسة ان اوكسيد التيتانيوم النانوي نوع الروتايل (r-TiO2) له فعالية مضادة للبكتريا ويمكن استخدامه كمضاد بكتيري لمختلف الاغراضRutile titanium dioxide (r-TiO2) Nano powder has been synthesized by hydrothermal method in autoclave. The reaction took place between titanium tetrachloride (TiCI4) and mixture solution consisted of deionized water and ethanol, in the ratio (3:7) respectively. The product has been dried and annealed at 400°C. The structure, morphology and the particle size of the Nano powder were investigated by X-ray Diffraction, Scanning Electron Microscopy (SEM), Atomic Force Microscope (AFM), FT-IR and UV/visible spectroscopy measurements. The effect of r-TiO2 on gram-negative bacteria Escherichia coli (E. coli) and gram-positive bacteria Staphylococcus aurous (S. aureus) has been studied. This study showed that rutile TiO2 Nano powder has efficient antibacterial activity, and can use as an antibacterial agent for different purpose

Gas Sensitivity of ITO Composite Prepared by Sol-Gel Method

Indium oxide and indium tin oxide composite (ITO) were prepared by sol-gel dip-coating (SGDC) technique. The particles annealed at (200 ◦C, 400 ◦C). The structure and surface morphology of particles were characterized by X-ray diffraction (XRD), Atomic Force Microscope (AFM), FT-IR and UV/visible measurements. The XRD and AFM indicate decreasing in the particle size and improve of optical and electrical properties of composite with increasing of tin oxide addition. The hall measurement were used to obtain information about the type of conductivity of indium oxide and indium tin oxide thin films and carrier concentration and mobility and resistivity, the results of Hall measurements show that the In2O3 and ITO composite have n-type. The thin film of composite ITO at composition (80:20) mole ratio has high sensitivity toward CO gas compared with pure indium oxide

Preparation and Characterization of Indium Oxide Nanoparticles by Sol-Gel Method and its NO2 Gas Sensing Properties

In this work, In2O3 nanoparticles were prepared by sol-gel method and deposited on quartz substrate by dip coating technique and annealed in air at different temperatures of (450, ,550 and 650) ̊ C at constant time (60 min). X-ray analysis has confirmed the formation of polycrystalline cubic phase that increases in crystaline size with increasing annealing temperature. The optical properties of In2O3 nanostructure thin film were studied. The transmittance was measured in the wavelength range from(300nm to 1100 nm) for all the films.The sensitivity toward NO2 gas has been measured,where In2O3 annealed at different temperatures