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| 1 | Electrical and dielectric properties of Ni_(0.5)Co_(0.5)Ga_(x)Fe_(1.8-x)O_(4)(x≤1.0)spinel ferrite microspheres显示文摘Microspheres of Ni_(0.5)Co_(0.5)Ga_(x)Fe_(2-x)O_(4)(x≤1.0)microsphere spinel ferrites(NiCoGaFe-MSFs)and carbon spheres were prepared via a hydrothermal technique.The micro structure of microspheres was investigated through scanning and transmission electron microscopy(SEM and TEM),respectively,and X-ray diffraction(XRD).The electrical and dielectric properties of NiCoGaFe-MSF at temperatures ranging from20 to 120℃(between 293,1×10^(3)and 393.1×10^(3))for f≤3.0 MHz were systematically studied as a result of 3D graphical drawing of the data obtained from an impedance analyzer.Relevant parameters such as ac/dc conductivity,dielectric loss,dielectric constant,activation energy,dissipation factor and Cole-Cole impedance spectra were extensively evaluated for various Ga ion mole ratios in the substitution where x≤1.0.We notice that the ac conductivity mostly obeys exponential power law rules,which vary significantly with the substitution ratios of Ga ions.Impedance analyses confirm that differences in conduction mechanisms in NiCoGaFe-MSFs are mainly due to grain-to-grain boundaries related to Ga ion substitution ratios.The change in dielectric constant of NiCoGaFe-MSFs is strongly dependent on the substitution rates and results in a normal dielectric distribution with frequency.The tangential loss for all micro spheres is observed to vary with measured temperatures and their frequency dependencies can be attributed to the conduction mechanism similar to Koop’s phenomenological model.It is clearly seen that the formation of semicircles is dominated by all the NiCoGaFe-MSFs and the diameter of the semicircles mostly decreases with increasing temperature,as evidence of a temperaturedependent relaxation mechanism. | S.Akhtar M.A.Almessiere B.Unal A.Demir Korkmaz Y.Slimani N.Tashkandi A.Baykal A.Ul-Hamid A.Manikandan | 2023 | Journal of Rare Earths2023，41，2： | 1 |
| 2 | Lithological mapping with multispectral data–setup and application of a spectral database for rocks in the Balakot area, Northern Pakistan显示文摘In the frame of landslide susceptibility assessment, a spectral library was created to support the identification of materials confined to a particular region using remote sensing images. This library, called Pakistan spectral library(pklib) version 0.1, contains the analysis data of sixty rock samples taken in the Balakot region in Northern Pakistan.The spectral library is implemented as SQLite database. Structure and naming are inspired by the convention system of the ASTER Spectral Library. Usability, application and benefit of the pklib were evaluated and depicted taking two approaches, the multivariate and the spectral based. The spectral information were used to create indices. The indices were applied to Landsat and ASTER data tosupportthespatial delineation of outcropping rock sequences instratigraphic formations. The application of the indices introduced in this paper helps to identify spots where specific lithological characteristics occur. Especially in areas with sparse or missing detailed geological mapping, the spectral discrimination via remote sensing data can speed up the survey. The library can be used not only to support the improvement of factor maps for landslide susceptibility analysis, but also to provide a geoscientific basisto further analyze the lithological spotin numerous regions in the Hindu Kush. | Michael FUCHS Adnan A.AWAN Sardar S.AKHTAR Ijaz AHMAD Simon SADIQ Asif RAZZAK Naghmah HAIDER | 2017 | Journal of Mountain Science2017，14，5： | 0 |
| 3 | 天然橡胶与高密度聚乙烯共混体的动态力学性能显示文摘前言聚合物类的动态力学性能人们已进行了广泛的研究。Studebker和Beatty就交联程度和交联类型对弹性体粘弹性的影响已进行了研究。少数研究者还研究了炭黑填料对弹性体动态力学性能的影响。Coran和Patel及Dc等已就热塑性树脂和弹体共混体而制备的热塑性弹性体的动态力学性能进行了研究。 | S.Akhtar S.S.Bhagawan 孙武建 | 1989 | 橡胶参考资料1989，，12： | 0 |
| 4 | Peristaltic flow of a heated Jeffrey fluid inside an elliptic duct:streamline analysis显示文摘The peristaltic flow of a heated Jeffrey fluid inside a duct with an elliptic cross-section is studied.A thorough heat transfer mechanism is interpreted by analyzing the viscous effects in the energy equation.The governing mathematical equations give dimensionless partial differential equations after simplification.The final simplified form of the mathematical equations is evaluated with respect to the relevant boundary conditions,and the exact solution is attained.The results are further illustrated by graphs,and the distinct aspects of peristaltic flow phenomena are discussed. | S.NADEEM S.AKHTAR A.SALEEM | 2021 | Applied Mathematics and Mechanics(English Edition)2021，42，4： | 0 |
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