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1. chinaXiv:201709.00001 [pdf]

Off-center moments set of Vlasov-Maxwell system

linhai
Subjects: Physics >> Physics of Gases, Plasmas, and Electric Discharges

We propose a more effective fluid description on Vlasov-Maxwell (V-M) system. It is via an open set of off-center moments, which obey an open set of motion equations.This new description is of more advantage to give exact macroscopic information of the V-M system than the well-known moments-description. The new description implies that obtaining exact solutions of all moments is not necessary condition of obtaining those of self-consistent fields. 我们对Vlasov-Maxwell系统提出一更有效的流体描述。该描述通过一开放的偏心矩系列。该偏心矩系列服从一开放的流体方程组。与著名的矩描述相比,该新描述更具有优势去获得准确的V-M系统的宏观信息。该新描述意味着所有矩的准确解不是自洽场准确解的必要条件。

submitted time 2017-09-03 Hits2121Downloads1180 Comment 0

2. chinaXiv:201705.00188 [pdf]

Magnetocaloric effect in high Gd content Gd-Fe-Al based amorphous/nanocrystalline systems with enhanced Curie temperature and refrigeration capacity

Zhang, LL [Zhang, Linlin][ 1,2 ]; Bao, MD [Bao, Mingdong][ 2 ]; Zheng, Q [Zheng, Qiang][ 2 ]; Tian, LH [Tian, Linhai][ 1 ]; Du, J [Du, Juan][ 3 ]
Subjects: Materials Science >> Nanoscience and Nanotechnology

The Gd-Fe-Al amorphous/nanocrystalline composites were successfully designed and obtained with both high Curie temperature (Tc) and large magnetic entropy change (?SM). The Tc can be tuned from 172 to 280 K and refrigeration capacity (RC) has a value between 690 and 867 J/kg under a eld change of 0–5 T by changing the Gd contents and the formation of Gd nanocrystallites. And, ?SM in Gd-Fe-Al amorphous/nanocrystalline composites reached a value of 7.2 J kg?1 K?1 under a eld change of 0–5 T. The high RC in Gd-Fe-Al system were ascribed to the widening full width at half maximum (δFWHM) up to 240 K of the magnetic entropy change (?SMmax) peak because of the combination contribution of amorphous matrix and the precipitated Gd-riched nanocrystalline. Our research would shed light on how to design attractive candidates for magnetic refrigeration materials with high perfor- manceatnearroomtemperature

submitted time 2017-05-09 Hits1900Downloads1075 Comment 0

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