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Study the total current density of Co Zn-Ferrite in the frequency range (1kHz – 1GHz)

دراسة توزع كثافة التيار الكلية للفرايت – Co Zn في المجال الترددي(1kHz – 1GHz)

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 Publication date 2014
and research's language is العربية
 Created by Shamra Editor




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In this work the study of the total current density distribution for Co(1-x)ZnxFe2O4 ferrite disc where (x=0.4) prepared by using traditional ceramic method as a function of disc radius in the frequency range (1kHz – 1GHz). For achievement of this investigation the disc radius and thickness, electrical conductivity and relative magnetic permeability have been used at room temperature. It is noticed that the total current density becomes concentrated on the outer lateral surface of the disc at 1GHz frequency while it almost stays constant and nearly equals one at other frequencies of the range.


Artificial intelligence review:
Research summary
تتناول هذه الدراسة توزع كثافة التيار الكلي لقرص من الفرايت CoZn في المجال الترددي (1KHz - 1GHz). تم تحضير القرص باستخدام الطريقة السيراميكية التقليدية، وتمت دراسة تأثير نصف قطر القرص، الناقلية الكهربائية، والنفاذية المغناطيسية النسبية عند درجة حرارة الغرفة. أظهرت النتائج أن كثافة التيار تتركز على السطح الجانبي للقرص عند التردد 1GHz، بينما تبقى ثابتة تقريباً عند الترددات الأخرى. تم استخدام معادلات ماكسويل التفاضلية والمعادلات المادية لتحليل كثافة التيار، وتمت مقارنة النتائج مع سلك نحاسي لإظهار الفروقات بين الفرايت والنواقل. توصلت الدراسة إلى أن كثافة تيار الاستقطاب والتمغنط تلعب دوراً مهماً في توليد حقل مغناطيسي دوار في العينة المدروسة، وأوصت بأهمية دراسة عينات مختلفة في الخصائص الكهربائية والمغناطيسية.
Critical review
دراسة نقدية: تعتبر هذه الدراسة مهمة في مجال الفيزياء التطبيقية، حيث تقدم فهماً عميقاً لتوزع كثافة التيار في مواد الفرايت. ومع ذلك، يمكن توجيه بعض النقد البناء لتحسين البحث. أولاً، كان من الممكن توسيع نطاق الدراسة ليشمل تأثيرات درجات حرارة مختلفة، مما قد يوفر رؤية أشمل حول سلوك الفرايت في ظروف متنوعة. ثانياً، لم يتم التطرق بشكل كافٍ إلى التطبيقات العملية لهذه النتائج في الصناعات المختلفة، مما يقلل من الفائدة العملية للدراسة. أخيراً، كان من الممكن استخدام تقنيات تحليلية إضافية مثل التحليل الطيفي لتقديم بيانات أكثر دقة وشمولية.
Questions related to the research
  1. ما هو المجال الترددي الذي تم دراسته في هذه الورقة؟

    تم دراسة المجال الترددي بين 1KHz و 1GHz.

  2. ما هي الطريقة المستخدمة لتحضير قرص الفرايت في هذه الدراسة؟

    تم استخدام الطريقة السيراميكية التقليدية لتحضير قرص الفرايت.

  3. أين تتركز كثافة التيار عند التردد 1GHz؟

    تتركز كثافة التيار على السطح الجانبي للقرص عند التردد 1GHz.

  4. ما هي العوامل التي تم أخذها في الاعتبار عند حساب كثافة التيار؟

    تم أخذ نصف قطر القرص، الناقلية الكهربائية، والنفاذية المغناطيسية النسبية في الاعتبار عند حساب كثافة التيار.


References used
SMIT J., WIJN H. P. J., Physical Properties of Ferromagnetic Oxides in Relation to Their Technical Applications, Philips Technical Library, 1959,p.137
PILKINGTON M. principles of inorganic chemistry, 2011, net – 2p32
www.ece.msstate.edu/~ donohoe/ece 3324notes 10.pdf
Liyong Wang, Modeling of High Speed Metal-Insulator – Semiconductor Inter connections: The effect ILD on slow – wave attenuation, A thesis submitted to the Graduate Master of Science, Rensselaer polytechnic Institute, Troy, New York,1998
PARDEEP A.,CHANDRASEKARAN G.,FTIR study of Ni, Cu and Zn substituted nanoparticles of MgFe2O4, Mater.Letters,vol.60,2006,p.371-374
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This work includes study of Co Zn-ferrite samples doped by Ni which prepared by Ceramic method. Then verified that it had spinel structure by using XRD. In addition we study properties such as electrical resistivity , electrical conductivity , dielec tric constant and loss coefficient. And also we have studied variations of this properties in terms of temperature at different frequencies in the range of (20 -105) Hz.
The ESR signal of the Co0.6Zn0.4Fe2O4 ferrite system was recorded at room temperature. The experimental magnetic moment value was estimated by means of integrated intensity of ESR signal and its maximum position. It has been used some theoretical rel ations were used to estimate the values of magnetic moment of the studied ferrite. The cation distributions between tetrahedral and octahedral sites were established from the values of magnetic moment.In addition, the lifetimeof energy level was determined.
errite (x=0.5) was prepared by a well-known conventional ceramic double sintering method (CCDS). Force constant K was calculated for tetrahedral and octahedral sites. The elastic constant C11, bulk modulus B , longitudinal and shear wave velocities w ere calculated. Threshold frequency for electronic transition was determined using IR spectra. In addition, the drift mobility for tetrahedral and octahedral sites, as well as magnetic dipole moment changes for bond were determined. The area beneath endothermic peaks was correlated to the weight change TG%. On the other hand, the heat capacity under constant pressure CP was correlated to sample treatment temperature. It has been noticed that the CP has a critical value at 175.
The uniform information density (UID) hypothesis posits a preference among language users for utterances structured such that information is distributed uniformly across a signal. While its implications on language production have been well explored, the hypothesis potentially makes predictions about language comprehension and linguistic acceptability as well. Further, it is unclear how uniformity in a linguistic signal---or lack thereof---should be measured, and over which linguistic unit, e.g., the sentence or language level, this uniformity should hold. Here we investigate these facets of the UID hypothesis using reading time and acceptability data. While our reading time results are generally consistent with previous work, they are also consistent with a weakly super-linear effect of surprisal, which would be compatible with UID's predictions. For acceptability judgments, we find clearer evidence that non-uniformity in information density is predictive of lower acceptability. We then explore multiple operationalizations of UID, motivated by different interpretations of the original hypothesis, and analyze the scope over which the pressure towards uniformity is exerted. The explanatory power of a subset of the proposed operationalizations suggests that the strongest trend may be a regression towards a mean surprisal across the language, rather than the phrase, sentence, or document---a finding that supports a typical interpretation of UID, namely that it is the byproduct of language users maximizing the use of a (hypothetical) communication channel.
Resonant photoemission of single crystals of the perovskite TbBaCoO3 has been carried out for freshly scraped surfaces. The resonance onset energy at the Co3p→3d threshold is used to explore the contribution of Co3d electrons to the electronic struct ure of the valence band. The Energy Distribution Curves (EDC) corresponding to the valence band of the crystal were determined for radiation energies hv in the region of hv=60 eV. For 63.2 eV binding energy, the main contribution of Co 3d electrons was found in the main valence band peak located at 7.46 eV below the Fermi level, whereas the contribution of Tb4f electrons was found at energy 12.08 eV below the Fermi level. The results show that the density of states close to the Fermi energy is of Co3d/O2p character, with any Tb4f contribution.
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