MgB 2 superconducting thin wires have been prepared by in-situ powder-in-tube process. Using Magnesium hydride MgH 2 and amorphous B powders with SiC nano-sized powder addition, SS/Fe/MgB 2 / steel composite wires of 0.53 mm ~ 0.19 mm in diameter have been fabricated through grooved rolling and drawing. The stainless steel sheath was hardened to a Vickers hardness of around 600 Hv by cold drawing. The Ic at 4.2 K and self-field for the MgB 2 wire of 0.53 mm in diameter without SiC addition is 200 A, which corresponds to the critical current density (Jc) of 4,300 A/mm 2 . The MgB 2 composite thin wires sheathed with low thermal conductive metals are promising as current leads with small heat leakage in liquid hydrogen.
Spatial-temporal dyllamics of calcillm signa]ing in T cel] activation Masahiro Shimozawai'2, Yuma ltoL'2. Makio Tokunaga]'2, Kumiko Sakata-Sogawai'2 (iGrad. Sch. Biosci. & Biotech. Tbkyo ihst. 7leeh., 2RC4L RIKEN) When cells are sub.iected to the specific signals, Ca2i is Teteased from the endoplasinic reticuluin (ER} through inositol triphosphate (IP3) reeeptors resulting store-operatcd calcium cntry (SOCE) from the plasma membrane.
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