12 research outputs found
Nonnegative Matrix Factorization Numerical Method for Integrated Photonic Cavity Based Spectroscopy
Nonnegative matrix factorization numerical method has been used to improve the spectral resolution of integrated photonic cavity based spectroscopy. Based on the experimental results for integrated photonic cavity device on Optics Letters 32, 632 (2007), the theoretical results show that the spectral resolution can be improved more than 3 times from 5.5ânm to 1.8ânm. It is a promising way to release the difficulty of fabricating high-resolution devices
The Ginger-shaped Asteroid 4179 Toutatis: New Observations from a Successful Flyby of Chang'e-2
On 13 December 2012, Chang'e-2 conducted a successful flyby of the near-Earth
asteroid 4179 Toutatis at a closest distance of 770 120 meters from the
asteroid's surface. The highest-resolution image, with a resolution of better
than 3 meters, reveals new discoveries on the asteroid, e.g., a giant basin at
the big end, a sharply perpendicular silhouette near the neck region, and
direct evidence of boulders and regolith, which suggests that Toutatis may bear
a rubble-pile structure. Toutatis' maximum physical length and width are (4.75
1.95 km) 10, respectively, and the direction of the + axis
is estimated to be (2505, 635) with respect to the
J2000 ecliptic coordinate system. The bifurcated configuration is indicative of
a contact binary origin for Toutatis, which is composed of two lobes (head and
body). Chang'e-2 observations have significantly improved our understanding of
the characteristics, formation, and evolution of asteroids in general.Comment: 21 pages, 3 figures, 1 tabl
Therapeutic Angiogenesis by Autologous Adipose-Derived Regenerative Cells: Comparison With Bone Marrow Mononuclear Cells
Paper-Cut Flexible Multifunctional Electronics Using MoS2 Nanosheet
Art and science represent human creativity and rational thinking, respectively. When the two seemingly opposite fields are intertwined, there is always a life-changing spark. In particular, the integration of ancient traditional Chinese art into the latest electronic devices is always been an unexcavated topic. Fabricating two-dimensional material with a tensile strain less than 3% with an ultimate global stretch has been an important problem that plagues the current flexible electronics field. The current research is limited to material in small scale, and it is always necessary to develop and extend large-sized flexible electronic systems. Here, inspired by the traditional Chinese paper-cut structure, we present a highly deformable multifunctional electronic system based on the MoS2 nanosheet. In this work, we first demonstrate how the traditional paper-cut structure can open the view of flexible electronics. In order to obtain a large area of MoS2 with excellent performance, we use a metal-assisted exfoliation method to transfer MoS2, followed by fabricating a field effect transistor to characterize its excellent electrical properties. Two photodetectors and a temperature sensor are produced with good performance. The mechanical simulation proves that the structure has more advantages in stretchability than other typical paper-cut structures. From the experimental and mechanical point of view, it is proved that the device can work stably under high deformation. We finally show that the device has broad application prospects in highly deformed organs, tissues, and joints. These findings set a good example of traditional Chinese culture to guide innovation in the field of electronic devices
Therapeutic angiogenesis by autologous adipose-derived regenerative cells: comparison with bone marrow mononuclear cells
Preserving Tradition, Facing the Future: Conservation and Innovation in Chinese Music
Papers on Chinese music by seven scholars, initially given as part of the Preserving Tradition, Facing the Future conference held at the University of Sydney in April 2010. Edited, with a forward, by Keith Howard and Lauren Gorfinkel. Each paper explores an aspect of the preservation of traditional music within the emerging category of 'intangible cultural heritage
Association of the von HippelâLindau Protein with AUF1 and Posttranscriptional Regulation of VEGFA mRNA
In situ lunar phase curves measured by ChangâE-4 in the Von KĂĄrmĂĄn Crater, South Pole-Aitken basin
Context. The Yutu-2 rover of the ChangâE-4 (CE-4) mission measured the lunar phase curves in the Von KĂĄrmĂĄn crater, South Pole-Aitken basin.
Aims. We aim to study the photometric properties of the regolith at CE-4âs landing site and compare them with those of ChangâE-3 (CE-3) in order to understand the regolith physical properties of the two landing sites.
Methods. We extracted the insitu lunar phase curves measured by CE-4 with a very wide phase angle coverage (1°â144°) and performed photometric model inversions using both the Hapke model and the Lumme-Bowell model.
Results. Compared with the CE-3 measurement taken in Mare Imbrium, the CE-4 phase curves show the colorimetric opposition effect and have a steeper and narrower opposition spike. The surface regolith at the CE-4 site is much darker, more porous, more forward scattering, and has a larger slope angle (Hapke model) than that of CE-3.
Conclusions. The CE-4 site may have experienced more space weathering alterations than the CE-3 site, which is consistent with their different surface model ages (~3.6 Ga for CE-4 and ~3 Ga for CE-3)