Zn content

Xem 1-6 trên 6 kết quả Zn content
  • Among spinel ferrites, Cd and Zn ferrites are always normal ferrites with Cd and Zn ions locating only in tetrahedral sites. This study presents effect of Zn on the magnetic and magnetocaloric properties of the mixed spinel ferrites Ni1-xZnxFe2O4 (x = 0.60, 0.65, 0.70, 0.75). The presence of Zn affects lattice parameters, saturation magnetization Ms, Curie temperature, Tc, and magnetic entropy change ∆Sm. At highest Zn content, Tc reduces to the temperature lower than room temperature and magnetic structure of spins in the octahedral sublattice should be strongly canted. ...

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  • The quantitative distribution of As, Cu, Pb, Zn elements in water and soils around Giáp Lai and Minh Quang sulfur deposits is presented in this work. The preliminary results delineate the following: i) The content of As in water is quite low and is below the polluted limit. The soils was symptomatic of pollution by As at low level. ii) The contents of Cu and Zn are higher than that of Pb, especially in some localities, Cu and Zn contents are over the permissible threshold of the surface water quality and form high anomalies....

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  • Kaiser et al. Nanoscale Research Letters 2011, 6:228 http://www.nanoscalereslett.com/content/6/1/228 NANO EXPRESS Open Access Defect induced changes on the excitation transfer dynamics in ZnS/Mn nanowires Uwe Kaiser1, Limei Chen1*, Sebastian Geburt2, Carsten Ronning2, Wolfram Heimbrodt1 Abstract Transients of Mn internal 3d5 luminescence in ZnS/Mn nanowires are strongly non-exponential. This nonexponential decay arises from an excitation transfer from the Mn ions to so-called killer centers, i.e.

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  • This article reviews methods for the determination and identification of trace elements in wine by using atomic absorption spectrometry (AAS). Wine is one of the most widely consumed beverages and strict analytical control of trace elements content is required during the whole process of wine production from grape to the final product.

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  • Zn(Al$_{1-x}$Cr$_x$)$_2$O$_4$ powders with Cr$^{3+}$ contents ranging from x = 0.005 to 0.3 have been synthesized by sol-gel method using the following precursors: zinc nitrate (Zn(NO$_3$)$_2\cdot6$H$_2$O), aluminium nitrate (Al(NO$_3$)$_3\cdot9$H$_2$O), chrome nitrate (Cr(NO$_3$)$_3\cdot9$H$_2$O), and citric acid. The effect of the Cr$^{3+}$ concentration on structural and optical properties of the synthesized samples has been studied.

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  • Zn the past decade, a number of natural language database access systems have been constructed (e.g. Hendrix 1976; Waltz et e l . 1976; Sacerdoti 1978; Harris 1979; Lehner~ and Shwartz 1982; Shvartz 1982). The level of performance achieved by natural language database access systems varies considerably, with the sore robust systems o p e r a t i n g v i t h t n a narrow domain ( i . e . , content area) and r e l y i n g heavily on domain-specif i c knowledge to guide the language understanding process. Transporting...

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