scholarly journals Theoretical studies of {63}^Cu Knight shifts of the normal state of YBa_2Cu_3O_7

2011 ◽  
Vol 14 (4) ◽  
pp. 43701 ◽  
Author(s):  
Kuang ◽  
Wu ◽  
Zhang ◽  
Song
Keyword(s):  
Normal State ◽  
Theoretical Studies ◽  
Knight Shifts

NMR Study of Single Crystal UBe13:9Be Knight Shifts in the Normal State

2006 ◽  
Vol 75 (Suppl) ◽  
pp. 107-109
Author(s):  
Norihiko Tsugawa ◽  
Hideki Tou ◽  
Masafumi Sera ◽  
Hisatomo Harima ◽  
Yoshinori Haga ◽  
...  
Keyword(s):  
Single Crystal ◽  
Normal State ◽  
Nmr Study ◽  
Knight Shifts

scholarly journals Unified approach to catastrophic events: from the normal state to geological or biological shock in terms of spectral fractal and nonlinear analysis

2006 ◽  
Vol 6 (2) ◽  
pp. 205-228 ◽  
Author(s):  
K. A. Eftaxias ◽  
P. G. Kapiris ◽  
G. T. Balasis ◽  
A. Peratzakis ◽  
K. Karamanos ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Normal State ◽  
Epileptic Seizures ◽  
Striking Similarity ◽  
Theoretical Studies ◽  
Unified Theory ◽  
Unified Approach ◽  
Common Features ◽  
Irreversible Phase Transitions ◽  
Electrical Activities

Abstract. An important question in geophysics is whether earthquakes (EQs) can be anticipated prior to their occurrence. Pre-seismic electromagnetic (EM) emissions provide a promising window through which the dynamics of EQ preparation can be investigated. However, the existence of precursory features in pre-seismic EM emissions is still debatable: in principle, it is difficult to prove associations between events separated in time, such as EQs and their EM precursors. The scope of this paper is the investigation of the pre-seismic EM activity in terms of complexity. A basic reason for our interest in complexity is the striking similarity in behavior close to irreversible phase transitions among systems that are otherwise quite different in nature. Interestingly, theoretical studies (Hopfield, 1994; Herz and Hopfield 1995; Rundle et al., 1995; Corral et al., 1997) suggest that the EQ dynamics at the final stage and neural seizure dynamics should have many similar features and can be analyzed within similar mathematical frameworks. Motivated by this hypothesis, we evaluate the capability of linear and non-linear techniques to extract common features from brain electrical activities and pre-seismic EM emissions predictive of epileptic seizures and EQs respectively. The results suggest that a unified theory may exist for the ways in which firing neurons and opening cracks organize themselves to produce a large crisis, while the preparation of an epileptic shock or a large EQ can be studied in terms of ''Intermittent Criticality''.

Theoretical studies of63Cu2+orbital Knight shifts of HgBa2Ca2Cu3O8+δ

2014 ◽  
Vol 40 (8) ◽  
pp. 675-677 ◽  
Author(s):  
Min-Quan Kuang ◽  
Shao-Yi Wu ◽  
Xian-Fen Hu
Keyword(s):  
Theoretical Studies ◽  
Knight Shifts

Theoretical studies on the Knight shifts for the tetragonal Cu2+ site in HgBa2CuO4+δ

2015 ◽  
Vol 29 (25n26) ◽  
pp. 1542020
Author(s):  
Guo-Liang Li ◽  
Shao-Yi Wu ◽  
Min-Quan Kuang ◽  
Xian-Fen Hu
Keyword(s):  
Local Structure ◽  
High Order ◽  
Order Perturbation ◽  
Theoretical Studies ◽  
Copper Site ◽  
Calculation Results ◽  
Knight Shifts

The Knight shifts for the tetragonal [Formula: see text] site in [Formula: see text] are theoretically studied from the high order perturbation formulas of the Knight shifts for a tetragonally elongated octahedral [Formula: see text] cluster. The significant anisotropy of the Knight shifts is attributable to the obvious tetragonal elongation distortion of the [Formula: see text] site. The anisotropic [Formula: see text] factors of this system are uniformly analyzed, and the calculation results and the local structure of the copper site are also discussed.

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