Structure and magnetic properties of La-Co-M alloys with nominal composition of LaCo/sub 7-x/M/sub x/ (M=Zr, or Ti, x=0-0.6)

Abstract

Alloys with nominal composition LaCo 7 ( = Zr, or Ti and = 0-0.6) were synthesized and characterized in the temperature range of 10-1273 K in fields up to 5 T. The experimental results show that the effects of Zr or Ti doping on the structure, phases present and magnetic properties of the LaCo 7 alloys are different. In the case of Zr, for as-cast alloys, besides the 1-5 (CaCu 5 ) and 1-13 (NaZn 13 ) phases, a new phase with = 1073 1173 K was detected. This new phase is probably in a hexagonal structure and shows a uniaxial anisotropy. After annealing at 1273 K, the 1-5 phase increases and almost dominates the materials when = 0 3 0 5. It shows a strong uniaxial anisotropy with = 95 135 kOe at both 300 K and 10 K. The 's are 838 K, which is almost the same as that of LaCo 5 . In the case of Ti, besides the 1-5 and 1-13 phases, another new phase with Th 2 Zn 17 structure was formed by Ti doping and almost dominates the materials when = 0 3 0 6. This phase exhibits a uniaxial anisotropy with 25 kOe at both 300 K and 10 K. decreases from 998 K to 901 K when the Ti content increases from = 0 25 to = 0.6. Index Terms-CaCu 5 , Hard magnetic properties, La-Co-Zr-Ti alloys, Th 2 Zn 17 structure.

Topological String Theory on Compact Calabi–Yau: Modularity and Boundary Conditions

“…These conditions unfortunately turn out to be somewhat weaker in the global case than in the local case.Similar forms as (1.1) for the F (g) appear in the context of Hurwitz theory on elliptic curves [18], of mirror symmetry in K3 fibre limits [35] and on rational complex surfaces [16, 17]. In the local cases, which have elliptic curves as mirror geometry, we found [12,13], that the above conditions (over)determine the unknowns in equations is provided by Hurwitz theory on elliptic curves [18].2 With fairly obvious generalizations for the cases where the mirror is a higher genus curve. In this case the traditional modular forms of subgroups Γ of Γ 0 := SL(2, Z) have to be replaced by Siegel modular forms of subgroups of Sp(2g, Z) [15].3 p 6(g−2) (k 1 , .…”

“…Similar forms as (1.1) for the F (g) appear in the context of Hurwitz theory on elliptic curves [18], of mirror symmetry in K3 fibre limits [35] and on rational complex surfaces [16, 17]. In the local cases, which have elliptic curves as mirror geometry, we found [12,13], that the above conditions (over)determine the unknowns in equations is provided by Hurwitz theory on elliptic curves [18].…”

“…It is nevertheless instructive to outline the general idea in this simple setting 1 . We focused on the N=2 SU(2) Seiberg-Witten case, but the features 1 Maybe the simplest example of the relation between modularity and the holomorphic anomaly 2 hold for any local Calabi-Yau whose mirror is an elliptic curve with a meromorphic differential [15,13] 2 and are as follows • The genus g topological string partition functions are given by…”

“…, k m ) and solve the theory. This holds also for the gauge theories with matter, which from geometric engineering point of view correspond to local Calabi-Yau manifolds with several (Kähler) moduli [13]. Using the precise anholomorphic dependence and restrictions from space-time modularity one can iterate the holomorphic anomaly equation with an algorithm which is exact in the moduli dependence and grows polynomially in complexity with the genus.Here we extend this approach further to compact Calabi-Yau spaces and focus on the class of one Kähler moduli Calabi-Yau spaces M such as the quintic.…”

Red nucleus glutamate facilitates neuropathic allodynia induced by spared nerve injury through non‐NMDA and metabotropic glutamate receptors

“…In addition to well-established roles in the motor system, the RN is also involved in pain processing and plays a descending regulatory role (Liu et al, 1991). Stimulation of the peripheral nerve or limbs can cause changes in the electrical activity of neurons in the RN, and chemical or electrical stimulation of the RN increases the pain threshold and has an analgesic effect in nociceptive pain experiments (Liu et al, 1991;Huang et al, 1992;Steffens et al, 2000). Our previous studies have demonstrated that the expressions of tumor necrosis factor-a (TNF-a), interleukin-1b (IL-1b), and nerve growth factor are upregulated in the RN of rats with spared nerve injury (SNI), and microinjection of their corresponding antibodies reduces mechanical allodynia induced by SNI Wang et al, 2008;Jing et al, 2009).…”