This review summarizes recent developments in the theory of spin glasses, as well as pertinent experimental data. The most characteristic properties of spin glass systems are described, and related phenomena in other glassy systems (dielectric and orientational glasses) are mentioned. The Edwards-Anderson model of spin glasses and its treatment within the replica method and mean-field theory are outlined, and concepts such as "frustration," "broken replica symmetry," "broken ergodicity," etc., are discussed. The dynamic approach to describing the spin glass transition is emphasized. Monte Carlo simulations of spin glasses and the insight gained by them are described. Other topics discussed include site-disorder models, phenomenological theories for the frozen phase and its excitations, phase diagrams in which spin glass order and ferromagnetism or antiferromagnetism compete, the Ne\'el model of superparamagnetism and related approaches, and possible connections between spin glasses and other topics in the theory of disordered condensed-matter systems.

Spin glasses: Experimental facts, theoretical concepts, and open questions

http://www.biblioteca.uma.es/bbldoc/articulos/16689835.pdf?origin=publication_detail

Antioxidant enzymes and human diseases

The role of antioxidants in the chemistry of oxidative stress: A review.

Total antioxidant capacity as a tool to assess redox status: critical view and experimental data

Premises of creation of Internet portal designed to provide access to participants of educational and scientific process for the joint creation, consolidation, concentration and rapid spreading of educational and scientific information resources in its own depository are considered. CMS-based portal content management systems’ potentiality is investigated. Architecture for Internet portal of MES of Ukraine’s information resources is offered.

Створення порталу інформаційно-довідкових ресурсів міністерства освіти і науки україни

The article by Villain [Z. Phys. B — Condensed Matter33, 31 (1979)] is discussed and a modified magnetic phase diagram is suggested for the spinel system (AB2O4) in which theA andB sites are partially (or completely) occupied by magnetic atoms. This diagram takes into account the antiferromagnetic exchange interactionsJAA,JBB andJAB between nearest neighbor cations of various types. Regions of paramagnetic, antiferromagnetic, ferrimagnetic and possible spin glass behaviour are indicated on the diagram.

Magnetic phase diagram of spinel spin-glasses

Oxidative Damage, Plasma Antioxidant Capacity, and Glucemic Control in Elderly NIDDM Patients

Publisher Summary This chapter discusses the physical–chemical structure of chromia–alumina catalysts The chapter describes the molecular configurations of chromium in chromia–alumina catalysts and the possible relationships of these configurations to the catalytic properties of chromia–alumina At the smallest chromium contents ( 2 O 3 structure The large clusters of chromia that constitute the β phase, assume the thermodynamically more stable α-Cr 2 O 3 structure Because a greater percentage of the chromium ions are exposed in the low concentration range, a greater catalytic effect per chromium ion at low concentrations is expected The γ structure has a much more disordered crystallographic form than the α structure that is assumed by the β phase at large chromium contents

The Physical-Chemical Properties of Chromia-Alumina Catalysts

Transformation formulas have been derived for conversions between the various conventional systems for reporting zero field splitting data using the Hamiltonian H = D [Sz2 − (1/3)S(S + 1)] + E(Sx2−Sy2). It is recommended that all future work be reported in the standard system corresponding to the range −1≤3E/D≤0.

Standardization of convention for zero field splitting parameters

An electron paramagnetic resonance study was made of Mn2+, Fe3+, and Cu2+ doped into the glass systems BaO–B2O3–Al2O3 and CaO–B2O3–Al2O3. The spectra of the manganese doped samples exhibited a barely resolved Mn2+ hyperfine pattern at g=2 and in some cases low field lines at g∼3 and g∼5. The concentration dependence of these low field lines is interpreted in terms of the lattice distortion produced by the very large barium and calcium ions and the resulting large zero field (D term) splitting. The 0.1% Mn samples produced better resolved hyperfine patterns than the 1% samples. The spectra of iron and copper doped glasses were also strongly concentration dependent. The results are discussed in terms of the glassy regions of the phase diagram.

Charles P. Poole

Papers

Magnetic phase diagram of spinel spin-glasses

Oxidative Damage, Plasma Antioxidant Capacity, and Glucemic Control in Elderly NIDDM Patients

The Physical-Chemical Properties of Chromia-Alumina Catalysts

Standardization of convention for zero field splitting parameters

EPR of Mn2+, Fe3+, and Cu2+ in glasses of the systems BaO–B2O3–Al2O3 and CaO–B2O3–Al2O3