Results 71 to 80 of about 4,313 (174)

Amphiphilic Polymer Conetworks for Non‐Fullerene Organic Solar Cells: Regulated Molecular Stacking Enables Efficient Downconversion

Advanced Energy Materials, EarlyView.
This work presents a novel bulk‐heterojunction‐integrated organic luminophore geometry using amphiphilic polymer conetworks as an interlayer scaffold. The design enhances optoelectronic performance via efficient downconversion and reinforced molecular stacking, offering a versatile architecture that paves the way for next‐generation organic solar cells.
Chieh‐Szu Huang, Danbi Kim, Wenyan Yang, Yang Lu, Robert J. E. Westbrook, Huagui Lai, Zimu Wei, Chaeyeon Lee, Fan Fu, Neil C. Greenham, Bo Ram Lee, Samuel D. Stranks   +11 more
wiley   +1 more source

A Spectroscopic Study of Blue Stragglers in M67 [PDF]

Proceedings of the International Astronomical Union, 2008
AbstractSpectrophotometric observations of the complete sample of twenty four blue stragglers (BSs) in the old galactic open cluster M67 (NGC2682) have been collected, using the Guillermo Haro Observatory in Cananea, Mexico. All the calibrated spectra were re-calibrated by the Beijing Arizona Taipei Connecticut (BATC) photometric system which includes ...
G. Q. Liu, L. Deng, M. Chávez, E. Bertone   +3 more
openaire   +1 more source

Design of Compact Liquid Crystal on Silicon Projection Optics Utilizing a Common Freeform Optical Path for Augmented Reality Displays

Advanced Intelligent Systems, EarlyView.
This study presents a compact freeform projection optics using dual wedge prisms for waveguide displays. Unlike previous designs that separate illumination and imaging paths, a freeform optical path integrates both. The system achieves a 32º field of view, 37.5 pixels per degree, and a total volume of less than 2 cm3.
Ximeng Wang, Dewen Cheng, Yuefan Shan, Da Wang, Tong Yang, Yongtian Wang   +5 more
wiley   +1 more source

Beryllium in the Ultra-Lithium-Deficient,Metal-Poor Halo Dwarf, G186-26

, 2005
The vast majority of low-metal halo dwarfs show a similar amount of Li; this has been attributed to the Li that was produced in the Big Bang. However, there are nine known halo stars with T $>$ 5900 K and [Fe/H] $
Alonso A., Ann Merchant Boesgaard, Bonifacio P., Magain P., Megan C. Novicki, Noguchi K., Primas F., Primas F., Schuster W. J., Spite F., Spite M., Spite M.   +11 more
core   +2 more sources

Optical Fiber‐Based Versatile Wearable Force Myography System: Application to Human–Robot Interaction

Advanced Intelligent Systems, EarlyView.
A compact and flexible wearable force myography sensor based on optical fiber technology detects muscle activity through pressure‐induced light loss. The sensor offers high sensitivity for detecting subtle force and finger motion changes, along with excellent signal stability under dynamic and sweating conditions.
Chongyoung Chung, Heeju Mun, Seyed Farokh Atashzar, Ki‐Uk Kyung   +3 more
wiley   +1 more source

Pancake Lenses through Curved Lamination for Compact Virtual Reality

Advanced Intelligent Systems, EarlyView.
This article presents an ultrathin VR optical system based on a 1.35 in. microdisplay, leveraging curved lamination technology. Compared to mainstream solutions, the proposed design demonstrates superior compactness (volume compression by 12%) and enhanced optical performance.
Jiaping Sun, Dewen Cheng, Cheng Chi, Yuefan Shan, Da Wang, Chao Ping Chen   +5 more
wiley   +1 more source

Spectroscopy of Blue Stragglers and Turnoff Stars in M67 (NGC 2682)

, 2000
We have analyzed high-resolution spectra of relatively cool blue stragglers and main sequence turnoff stars in the old open cluster M67 (NGC 2682).
Ahumada J., Andrievsky S. M., Anupama G. C., Belloni T., Chevalier C., Edvardsson B., Eric L. Sandquist, Faraggiana R., Goranskij V. P., Gratton R. G., Harlow J. J. B., Mathys G., Matthew D. Shetrone, Murray C. A., Murray C. A., Perryman M. A. C., Sanders W. L., Sanders W. L., Sarna M. J., Talon S., van den Berg M., Varenne O., Zhao J. L.   +22 more
core   +1 more source

The spectra and ages of blue stragglers

The Astrophysical Journal, 1985
A mechanism similar to Wheeler's quasi-homogeneous evolution and Finzi and Wolf's proposal for blue stragglers is proposed as the origin of the blue stragglers in intermediate-age clusters. Blue stragglers are stars whose positions in color-magnitude diagrams of open and globular clusters are significantly above the turn-off points and in the region of
openaire   +1 more source

Field population II blue stragglers

The Astrophysical Journal, 1981
Photometry and high-resolution spectra are presented and discussed of metal-poor stars hotter than the turn-off of globular clusters. Very few nonvariable candidates for blue stragglers can be identified One, HD 100363, is probably an old-disk short-period variable.
B. W. Carney, R. C. Peterson
openaire   +1 more source

Commissioning an Inexpensive Off‐The‐Shelf Spectrograph for Radial‐Velocity Studies

Astronomische Nachrichten, EarlyView.
ABSTRACT We present a way to set up an inexpensive out of the shelf spectrograph at a local observatory. Stability and resolution of the spectrograph are high enough for radial velocity determination of binary stars or determination of stellar characteristics. Even some exoplanets might be detectable via the radial velocity method.
Lukas Stock, Andreas Schrimpf
wiley   +1 more source