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This paper presents the experimental results of a high-temperature heat pipe with fins at horizontal. The heat pipe tube is designed to Φ25 × 410 mm, two wraps of 100 mesh screen, and filling mass of 15 g sodium. The height and thickness of the fins are 13 mm and 1 mm, and the gap distance between two fins is 5 mm. The wall material of the tube container and fins both are stainless steel. In order to compare the impact of the fins on the startup performance of the heat pipe, a plain-tube high-temperature heat pipe without fins which has the same dimensions is also comparatively experimented. The experimental results show that the finned heat pipe can start successfully and its end of condenser behaves bright red color, which is roughly in accordance with the results of the plain-tube heat pipe. The comparative results also show that the startup time of full startup and the temperature difference between evaporator and condenser after fully starting for the finned heat pipe and plain-tube heat pipe are similarly same. However, adding fins in condenser have a great effect on the temperature rise-rate during starting process and the quasi-steady or equilibrium temperature after startup between the results of two heat pipes.

By Hartman Nirenberg's theorem, any complete flat hypersurface in Euclidean space must be a cylinder over a plane curve. However, if we admit some singularities, there are many non-trivial examples. Flat fronts are flat hypersurfaces with admissible singularities. Murata Umehara gave a representation formula for complete flat fronts with non- empty singular set in Euclidean 3-space, and proved the four vertex type theorem. In this paper, we prove that, unlike the case of n = 2, there do not exist any complete flat fronts with non- empty singular set in Euclidean (n + 1)-space (n [greater than or equal to] 3). Key words: Flat hypersurface; flat front; Hartman Nirenberg's theorem; singular point; wave front; coherent tangent bundle.

The daughters and sons of the professionally stylish may have been born aesthetically advantaged, but when it comes to matters of taste, they aren't always a chip off the old block. Charles Gandee goes looking for family resemblances.

The grand old house of Asprey—caterer to whims of the wealthy and royal for generations—has been rebuilt and reenvisioned as the luxury giant of the future. Sarah Mower learns why the sun never sets on this English mercantile empire.

Now that furin the form of collars, trims, and wrapshas established itself as the ultimate accessory, the trick is piling it on artfully.