3D PRINTING Additive manufacturing of polymer-derived ceramics

被引：900

作者：

Eckel, Zak C. ^{[1
]}

Zhou, Chaoyin ^{[1
]}

Martin, John H. ^{[1
]}

Jacobsen, Alan J. ^{[1
]}

Carter, William B. ^{[1
]}

Schaedler, Tobias A. ^{[1
]}

机构：

[1] HRL Labs LLC, Malibu, CA 90265 USA

来源：

SCIENCE | 2016年 / 351卷 / 6268期

关键词：

MICROSCALE TRUSS STRUCTURES; WAVE-GUIDES; AMORPHOUS CERAMICS; OXIDATION; BEHAVIOR; SICO; CRISTOBALITE; FABRICATION; SYSTEM; RANGE;

D O I：

10.1126/science.aad2688

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

070301 [无机化学]; 070403 [天体物理学]; 070507 [自然资源与国土空间规划学]; 090105 [作物生产系统与生态工程];

摘要：

The tidal disruption of a star by a supermassive black hole leads to a short-lived thermal flare. Despite extensive searches, radio follow-up observations of known thermal stellar tidal disruption flares (TDFs) have not yet produced a conclusive detection. We present a detection of variable radio emission from a thermal TDF, which we interpret as originating from a newly launched jet. The multiwavelength properties of the source present a natural analogy with accretion-state changes of stellar mass black holes, which suggests that all TDFs could be accompanied by a jet. In the rest frame of the TDF, our radio observations are an order of magnitude more sensitive than nearly all previous upper limits, explaining how these jets, if common, could thus far have escaped detection.

引用

页码：58 / 62

页数：5

共 30 条

[1]

[Anonymous], 1997, Cellular solid structure and properties

[2]

Volume change attending low-to-high inversion of cristobalite [J].