scholarly journals Search for non-Newtonian interactions at micrometer scale with a levitated test mass

2021 ◽  
Vol 104 (6) ◽  
Author(s):  
Charles P. Blakemore ◽  
Alexander Fieguth ◽  
Akio Kawasaki ◽  
Nadav Priel ◽  
Denzal Martin ◽  
...  
Keyword(s):  
Test Mass ◽  
Micrometer Scale

scholarly journals Brain capillary structures of schizophrenia cases and controls show a correlation with their neuron structures

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Rino Saiga ◽  
Masayuki Uesugi ◽  
Akihisa Takeuchi ◽  
Kentaro Uesugi ◽  
Yoshio Suzuki ◽  
...  
Keyword(s):  
Blood Vessels ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Superior Temporal Gyrus ◽  
Anterior Cingulate ◽  
Dimensional Structure ◽  
Constant Diameter ◽  
The Mean ◽  
Cartesian Coordinate ◽  
Micrometer Scale

AbstractBrain blood vessels constitute a micrometer-scale vascular network responsible for supply of oxygen and nutrition. In this study, we analyzed cerebral tissues of the anterior cingulate cortex and superior temporal gyrus of schizophrenia cases and age/gender-matched controls by using synchrotron radiation microtomography or micro-CT in order to examine the three-dimensional structure of cerebral vessels. Over 1 m of cerebral blood vessels was traced to build Cartesian-coordinate models, which were then used for calculating structural parameters including the diameter and curvature of the vessels. The distribution of vessel outer diameters showed a peak at 7–9 μm, corresponding to the diameter of the capillaries. Mean curvatures of the capillary vessels showed a significant correlation to the mean curvatures of neurites, while the mean capillary diameter was almost constant, independent of the cases. Our previous studies indicated that the neurites of schizophrenia cases are thin and tortuous compared to controls. The curved capillaries with a constant diameter should occupy a nearly constant volume, while neurons suffering from neurite thinning should have reduced volumes, resulting in a volumetric imbalance between the neurons and the vessels. We suggest that the observed structural correlation between neurons and blood vessels is related to neurovascular abnormalities in schizophrenia.

scholarly journals In Situ Hyperspectral Raman Imaging: A New Method to Investigate Sintering Processes of Ceramic Material at High-temperature

2019 ◽  
Vol 9 (7) ◽  
pp. 1310 ◽  
Author(s):  
Kerstin Hauke ◽  
Johannes Kehren ◽  
Nadine Böhme ◽  
Sinje Zimmer ◽  
Thorsten Geisler
Keyword(s):  
High Temperature ◽  
Raman Imaging ◽  
In Situ Studies ◽  
Kinetic Information ◽  
Novel Approach ◽  
In Situ Investigation ◽  
Dependent Growth ◽  
Micrometer Scale ◽  
Sintering Processes

In the last decades, Raman spectroscopy has become an important tool to identify and investigate minerals, gases, glasses, and organic material at room temperature. In combination with high-temperature and high-pressure devices, however, the in situ investigation of mineral transformation reactions and their kinetics is nowadays also possible. Here, we present a novel approach to in situ studies for the sintering process of silicate ceramics by hyperspectral Raman imaging. This imaging technique allows studying high-temperature solid-solid and/or solid-melt reactions spatially and temporally resolved, and opens up new avenues to study and visualize high-temperature sintering processes in multi-component systems. After describing in detail the methodology, the results of three application examples are presented and discussed. These experiments demonstrate the power of hyperspectral Raman imaging for in situ studies of the mechanism(s) of solid-solid or solid-melt reactions at high-temperature with a micrometer-scale resolution as well as to gain kinetic information from the temperature- and time-dependent growth and breakdown of minerals during isothermal or isochronal sintering.

scholarly journals Micrometer-scale machining of metals and polymers enabled by focused ion beam sputtering

1998 ◽  
Vol 546 ◽  
Author(s):  
D. P. Adams ◽  
G. L. Benavides ◽  
M. J. vasile
Keyword(s):  
Focused Ion Beam ◽  
Ion Beam ◽  
Ion Beam Sputtering ◽  
Beam Sputtering ◽  
End Mills ◽  
Ultra Precision ◽  
Tool Shank ◽  
Micrometer Scale ◽  
Tool Cutting ◽  
Micro Tools

AbstractThis work combines focused ion beam sputtering and ultra-precision machining for microfabrication of metal alloys and polymers. Specifically, micro-end mills are made by Ga ion beam sputtering of a cylindrical tool shank. Using an ion energy of 20keV, the focused beam defines the tool cutting edges that have submicrometer radii of curvature. We demonstrate 25μm diameter micromilling tools having 2, 4 and 5 cutting edges. These tools fabricate fine channels, 26–28 microns wide, in 6061 aluminum, brass, and polymethyl methacrylate. Micro-tools are structurally robust and operate for more than 5 hours without fracture.

From Nano- to Micrometer Scale: The Role of Antisolvent Treatment on High Performance Perovskite Solar Cells

2017 ◽  
Vol 29 (8) ◽  
pp. 3490-3498 ◽  
Author(s):  
S. Paek ◽  
P. Schouwink ◽  
E. Nefeli Athanasopoulou ◽  
K. T. Cho ◽  
G. Grancini ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Performance ◽  
Perovskite Solar Cells ◽  
Micrometer Scale

Magnetic flux concentration at micrometer scale

2013 ◽  
Vol 111 ◽  
pp. 77-81 ◽  
Author(s):  
Xu Sun ◽  
Lijun Jiang ◽  
Philip W.T. Pong
Keyword(s):  
Magnetic Flux ◽  
Flux Concentration ◽  
Micrometer Scale

scholarly journals Reconstructing micrometer-scale fiber pathways in the brain: Multi-contrast optical coherence tomography based tractography

NeuroImage ◽  
2011 ◽  
Vol 58 (4) ◽  
pp. 984-992 ◽  
Author(s):  
Hui Wang ◽  
Adam J. Black ◽  
Junfeng Zhu ◽  
Tyler W. Stigen ◽  
Muhammad K. Al-Qaisi ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence ◽  
Micrometer Scale ◽  
The Brain

High areal capacity, micrometer-scale amorphous Si film anode based on nanostructured Cu foil for Li-ion batteries

2014 ◽  
Vol 267 ◽  
pp. 629-634 ◽  
Author(s):  
Wenping Si ◽  
Xiaolei Sun ◽  
Xianghong Liu ◽  
Lixia Xi ◽  
Yandong Jia ◽  
...  
Keyword(s):  
Li Ion Batteries ◽  
Li Ion ◽  
Amorphous Si ◽  
Cu Foil ◽  
Micrometer Scale ◽  
Areal Capacity

scholarly journals Demonstration of an integrated nanophotonic chip-scale alkali vapor magnetometer using inverse design

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Yoel Sebbag ◽  
Eliran Talker ◽  
Alex Naiman ◽  
Yefim Barash ◽  
Uriel Levy
Keyword(s):  
Spatial Resolution ◽  
Near Field ◽  
Computer Assisted ◽  
Experimental Characterization ◽  
Optical Isolation ◽  
New Concepts ◽  
On Chip ◽  
The Cost ◽  
Micrometer Scale

AbstractRecently, there has been growing interest in the miniaturization and integration of atomic-based quantum technologies. In addition to the obvious advantages brought by such integration in facilitating mass production, reducing the footprint, and reducing the cost, the flexibility offered by on-chip integration enables the development of new concepts and capabilities. In particular, recent advanced techniques based on computer-assisted optimization algorithms enable the development of newly engineered photonic structures with unconventional functionalities. Taking this concept further, we hereby demonstrate the design, fabrication, and experimental characterization of an integrated nanophotonic-atomic chip magnetometer based on alkali vapor with a micrometer-scale spatial resolution and a magnetic sensitivity of 700 pT/√Hz. The presented platform paves the way for future applications using integrated photonic–atomic chips, including high-spatial-resolution magnetometry, near-field vectorial imaging, magnetically induced switching, and optical isolation.

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