1,160 research outputs found
Development of Novel Building-Integrated Photovoltaic (BIPV) System in Building Architectural Envelope
The influence of intravesical prostatic protrusion and post operative continence after patients received robotic assisted laparoscopic radical prostatectomy
Accuracy of Segment-Anything Model (SAM) in medical image segmentation tasks
The segment-anything model (SAM), was introduced as a fundamental model for
segmenting images. It was trained using over 1 billion masks from 11 million
natural images. The model can perform zero-shot segmentation of images by using
various prompts such as masks, boxes, and points. In this report, we explored
(1) the accuracy of SAM on 12 public medical image segmentation datasets which
cover various organs (brain, breast, chest, lung, skin, liver, bowel, pancreas,
and prostate), image modalities (2D X-ray, histology, endoscropy, and 3D MRI
and CT), and health conditions (normal, lesioned). (2) if the computer vision
foundational segmentation model SAM can provide promising research directions
for medical image segmentation. We found that SAM without re-training on
medical images does not perform as accurately as U-Net or other deep learning
models trained on medical images.Comment: Technical Repor
SU(2)-in-SU(1,1) Nested Interferometer for Highly Sensitive, Loss-Tolerant Quantum Metrology
We present experimental and theoretical results on a new interferometer
topology that nests a SU(2) interferometer, e.g., a Mach-Zehnder or Michelson
interferometer, inside a SU(1,1) interferometer, i.e., a Mach-Zehnder
interferometer with parametric amplifiers in place of beam splitters. This
SU(2)-in-SU(1,1) nested interferometer (SISNI) simultaneously achieves high
signal-to-noise ratio (SNR), sensitivity beyond the standard quantum limit
(SQL) and tolerance to photon losses external to the interferometer, e.g., in
detectors. We implement a SISNI using parametric amplification by four-wave
mixing (FWM) in Rb vapor and a laser-fed Mach-Zehnder SU(2) interferometer. We
observe path-length sensitivity with SNR 2.2 dB beyond the SQL at power levels
(and thus SNR) 2 orders of magnitude beyond those of previous loss-tolerant
interferometers. We find experimentally the optimal FWM gains and find
agreement with a minimal quantum noise model for the FWM process. The results
suggest ways to boost the in-practice sensitivity of high-power
interferometers, e.g., gravitational wave interferometers, and may enable
high-sensitivity, quantum-enhanced interferometry at wavelengths for which
efficient detectors are not available.Comment: 6 pages + 4 of supplemental material, 5 figure
Dimethyl 3,5-diethyl-1H-pyrrole-2,4-dicarboxylÂate
The title pyrrole derivative, C12H17NO4, consists of a pyrrole ring with two diagonally attached methÂoxyÂcarbonyl groups and two diagonally attached ethyl groups. The two carbonyl groups are approximately in the same plane as the pyrrole ring, making dihedral angles of 3.50 (19) and 6.70 (19)°. In the crystal, adjacent molÂecules are assembled into dimers in a head-to-head mode by pairs of interÂmolecular N—H⋯O hydrogen bonds
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