Results 91 to 100 of about 600,629 (280)

See-Through Near-Eye Display with Built-in Prescription and Two-Dimensional Exit Pupil Expansion

Applied Sciences, 2020
We propose a see-through near-eye display featuring an exit pupil expander (EPE), which is composed of two multiplexed slanted gratings. Via a two-dimensional expansion, the exit pupil (EP) is able to be enlarged up to 10 × 8 mm2.
Wenbo Zhang, Chao Ping Chen, Haifeng Ding, Lantian Mi, Jie Chen, Yuan Liu, Changzhao Zhu   +6 more
doaj   +1 more source

Polarization‐resolved femtosecond Vis/IR spectroscopy tailored for resolving weak signals in biological samples using minimal sample volume

FEBS Open Bio, EarlyView.
Unique biological samples, such as site‐specific mutant proteins, are available only in limited quantities. Here, we present a polarization‐resolved transient infrared spectroscopy setup with referencing to improve signal‐to‐noise tailored towards tracing small signals. We provide an overview of characterizing the excitation conditions for polarization‐
Clark Zahn, Karsten Heyne
wiley   +1 more source

The Great Space Weather Event during February 1872 Recorded in East Asia

, 2018
The study of historical great geomagnetic storms is crucial for assessing the possible risks to the technological infrastructure of a modern society, caused by extreme space-weather events.
Ebihara, Yusuke, Giunta, Alessandra S., Hattori, Kentaro, Hayakawa, Hisashi, Hayakawa, Satoshi, Macdonald, Lee T., Mitsuma, Yasuyuki, Shibata, Kazunari, Silverman, Sam M., Toriumi, Shin, Wild, Matthew N., Willis, David M.   +11 more
core   +1 more source

Improving near-eye display resolution by polarization multiplexing

Optics Express, 2019
We present here an optical approach to boost the apparent pixel density by utilizing the superimposition of two shifted-pixel grids generated by a Pancharatnam-Berry deflector (PBD). The content of the two shifted pixel grids are presented to the observer's eye simultaneously using a polarization-multiplexing method.
Tao Zhan, Jianghao Xiong, Guanjun Tan, Yun-Han Lee, Jilin Yang, Sheng Liu, Shin-Tson Wu   +6 more
openaire   +2 more sources

Long‐term hippocampal alterations and cognitive impairment in a murine model of surgical sepsis

FEBS Open Bio, EarlyView.
Using a mouse model of surgical sepsis, we tested long‐term memory and analyzed the transcriptome of single cells isolated from the hippocampus. Survivor mice showed worse memory, loss of certain brain cell subpopulations, and abnormal immune cell activity—suggesting that post‐sepsis brain alterations may be linked to cognitive deficits.
Dong Seong Cho, Rebecca Schmitt, Aneesha Dasgupta, Alexandra Ducharme, Jason Doles   +4 more
wiley   +1 more source

Derivation and characterization of retinal pigment epithelium from urine‐derived iPSCs

FEBS Open Bio, EarlyView.
Age‐related macular degeneration causes vision loss via RPE dysfunction and loss. Traditional iPSC therapies rely on invasive biopsies, limiting scalability. Here, we utilize urine‐derived stem cells as an accessible source to generate u‐iPSCs, successfully differentiated into pigmented RPE. This “Urine‐to‐Retina” platform provides a promising path for
Daniella Beiner, Hainan Zhu, Carol Christine Bosholm, Heuy‐Ching Wang, Tracy Criswell, Anthony Atala, Jian‐Xing Ma, Yuanyuan Zhang   +7 more
wiley   +1 more source

Waveguide‐Based Retinal Projection Near‐Eye Display with Bidirectional Eyebox Expansion

Advanced Intelligent Systems
Based on the mechanism of human visual imaging, retinal projection display (RPD) directly projects images onto the retina, achieving sharp images without relying on the focal adjustment of human eye. However, the physiological phenomenon of eye movements
Yujing Fu, Lijun Jiang, Jiafu Lin, Yuang Chen, Huan Deng   +4 more
doaj   +1 more source

Diffraction Efficiency Distribution of Output Grating in Holographic Waveguide Display System

IEEE Photonics Journal, 2018
Planar waveguide structure has benefits to expand the exit pupil of the near-eye display. To achieve a uniform output luminance within the expanded exit pupil, a specific distribution of diffractive efficiency (DE) should be set for the out-coupling ...
Ao Liu, Yuning Zhang, Yishi Weng, Zhongwen Shen, Baoping Wang   +4 more
doaj   +1 more source

Optical joint correlator for real-time image tracking and retinal surgery [PDF]

, 1991
A method for tracking an object in a sequence of images is described. Such sequence of images may, for example, be a sequence of television frames. The object in the current frame is correlated with the object in the previous frame to obtain the relative
Juday, Richard D.
core   +1 more source

Design of see-through near-eye display for presbyopia

Optics Express, 2017
We propose a compact design of see-through near-eye display that is dedicated to presbyopia. Our solution is characterized by a plano-convex waveguide, which is essentially an integration of a corrective lens and two volume holograms. Its design rules are set forth in detail, followed by the results and discussion regarding the diffraction efficiency ...
Yishi, Wu, Chao Ping, Chen, Lei, Zhou, Yang, Li, Bing, Yu, Huayi, Jin   +5 more
openaire   +2 more sources