Methods and systems are provided for social shopping on a network-based marketplace. The single-crystal material is produced by compressing a ceramic or metal single-crystal blank at a high temperature from a direction allowing the activation of a single slip to induce plastic deformation therein, and then subjecting the resulting product to a heat treatment. , 35-45\xb0 relative to radii of the arcuate edges. Memory controller bypass logic is connected to the first and second memory controllers and selects for a memory client at least one of the first and second memory controllers in response to a change in a power conservation condition. At least one conduit extends from the lower side of the holding vessel. In such a steam engine, an inner radius \u201cr1\u201d of the cooling portion is made to almost equal to a depth \u201c\u03b41\u201d of thermal penetration, which is calculated by the following formula ;\u03b41=2\u2062a1\u03c9wherein, \u201ca1\u201d is a heat diffusivity of the working fluid at its low pressure, and \u201c\u03c9\u201d is an angular frequency of the movement of the working fluid.