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Article ; Online: In-plane oxygen diffusion measurements in polymer films using time-resolved imaging of programmable luminescent tags.

Kantelberg, Richard / Achenbach, Tim / Kirch, Anton / Reineke, Sebastian

2024 Volume 14, Issue 1, Page(s) 5826

Abstract: ... this work provides a low-cost, precise and reliable method to determine the oxygen diffusion coefficient D ... 13k and 350k g/mol are determined to be in the range of (0.8-1.5) × 10 ...

Abstract	Oxygen diffusion properties in thin polymer films are key parameters in industrial applications from food packaging, over medical encapsulation to organic semiconductor devices and have been continuously investigated in recent decades. The established methods have in common that they require complex pressure-sensitive setups or vacuum technology and usually do not come without surface effects. In contrast, this work provides a low-cost, precise and reliable method to determine the oxygen diffusion coefficient D in bulk polymer films based on tracking the phosphorescent pattern of a programmable luminescent tag over time. Our method exploits two-dimensional image analysis of oxygen-quenched organic room-temperature phosphors in a host polymer with high spatial accuracy. It avoids interface effects and accounts for the photoconsumption of oxygen. As a role model, the diffusion coefficients of polystyrene glasses with molecular weights between 13k and 350k g/mol are determined to be in the range of (0.8-1.5) × 10
Language	English
Publishing date	2024-03-09
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-024-56237-5
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Article ; Online: Ultracold neutron storage and transport at the PSI UCN source.

Bison, G / Daum, M / Kirch, K / Lauss, B / Ries, D / Schmidt-Wellenburg, P / Zsigmond, G

The European physical journal. A, Hadrons and nuclei

2022 Volume 58, Issue 6, Page(s) 103

Abstract: Efficient neutron transport is a key ingredient to the performance of ultracold neutron (UCN) sources, important to meeting the challenges placed by high precision fundamental physics experiments. At the Paul Scherrer Institute's UCN source we have been ... ...

Abstract	Efficient neutron transport is a key ingredient to the performance of ultracold neutron (UCN) sources, important to meeting the challenges placed by high precision fundamental physics experiments. At the Paul Scherrer Institute's UCN source we have been continuously improving our understanding of the UCN source parameters by performing a series of studies to characterize neutron production and moderation, and UCN production, extraction, and transport efficiency to the beamport. The present study on the absolute UCN transport efficiency completes our previous publications. We report on complementary measurements, namely one on the height-dependent UCN density and a second on the transmission of a calibrated quantity of UCN over a
Language	English
Publishing date	2022-06-06
Publishing country	France
Document type	Journal Article
ZDB-ID	1459066-9
ISSN	1434-601X ; 1434-6001
ISSN (online)	1434-601X
ISSN	1434-6001
DOI	10.1140/epja/s10050-022-00747-1
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Article: Achieving ultra-low and -uniform residual magnetic fields in a very large magnetically shielded room for fundamental physics experiments.

Ayres, N J / Ban, G / Bison, G / Bodek, K / Bondar, V / Bouillaud, T / Bowles, D / Chanel, E / Chen, W / Chiu, P-J / Crawford, C B / Naviliat-Cuncic, O / Doorenbos, C B / Emmenegger, S / Fertl, M / Fratangelo, A / Griffith, W C / Grujic, Z D / Harris, P G /

Kirch, K / Kletzl, V / Krempel, J / Lauss, B / Lefort, T / Lejuez, A / Li, R / Mullan, P / Pacura, S / Pais, D / Piegsa, F M / Rienäcker, I / Ries, D / Pignol, G / Rebreyend, D / Roccia, S / Rozpedzik, D / Saenz-Arevalo, W / Schmidt-Wellenburg, P / Schnabel, A / Segarra, E P / Severijns, N / Svirina, K / Tavakoli Dinani, R / Thorne, J / Vankeirsbilck, J / Voigt, J / Yazdandoost, N / Zejma, J / Ziehl, N / Zsigmond, G / nEDM Collaboration At Psi, The

The European physical journal. C, Particles and fields

2024 Volume 84, Issue 1, Page(s) 18

Abstract: High-precision searches for an electric dipole moment of the neutron (nEDM) require stable and uniform magnetic field environments. We present the recent achievements of degaussing and equilibrating the magnetically shielded room (MSR) for the n2EDM ... ...

Abstract	High-precision searches for an electric dipole moment of the neutron (nEDM) require stable and uniform magnetic field environments. We present the recent achievements of degaussing and equilibrating the magnetically shielded room (MSR) for the n2EDM experiment at the Paul Scherrer Institute. We present the final degaussing configuration that will be used for n2EDM after numerous studies. The optimized procedure results in a residual magnetic field that has been reduced by a factor of two. The ultra-low field is achieved with the full magnetic-field-coil system, and a large vacuum vessel installed, both in the MSR. In the inner volume of
Language	English
Publishing date	2024-01-08
Publishing country	France
Document type	Journal Article
ZDB-ID	1459069-4
ISSN	1434-6052 ; 1434-6044
ISSN (online)	1434-6052
ISSN	1434-6044
DOI	10.1140/epjc/s10052-023-12351-8
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Article ; Online: The Double-H Maze: A Robust Behavioral Test for Learning and Memory in Rodents.

Kirch, Robert D / Pinnell, Richard C / Hofmann, Ulrich G / Cassel, Jean-Christophe

Journal of visualized experiments : JoVE

2015 , Issue 101, Page(s) e52667

Abstract: ... in many of these tasks is the lack of control over the strategy employed by the rodents to reach the goal, e.g ...

Abstract	Spatial cognition research in rodents typically employs the use of maze tasks, whose attributes vary from one maze to the next. These tasks vary by their behavioral flexibility and required memory duration, the number of goals and pathways, and also the overall task complexity. A confounding feature in many of these tasks is the lack of control over the strategy employed by the rodents to reach the goal, e.g., allocentric (declarative-like) or egocentric (procedural) based strategies. The double-H maze is a novel water-escape memory task that addresses this issue, by allowing the experimenter to direct the type of strategy learned during the training period. The double-H maze is a transparent device, which consists of a central alleyway with three arms protruding on both sides, along with an escape platform submerged at the extremity of one of these arms. Rats can be trained using an allocentric strategy by alternating the start position in the maze in an unpredictable manner (see protocol 1; §4.7), thus requiring them to learn the location of the platform based on the available allothetic cues. Alternatively, an egocentric learning strategy (protocol 2; §4.8) can be employed by releasing the rats from the same position during each trial, until they learn the procedural pattern required to reach the goal. This task has been proven to allow for the formation of stable memory traces. Memory can be probed following the training period in a misleading probe trial, in which the starting position for the rats alternates. Following an egocentric learning paradigm, rats typically resort to an allocentric-based strategy, but only when their initial view on the extra-maze cues differs markedly from their original position. This task is ideally suited to explore the effects of drugs/perturbations on allocentric/egocentric memory performance, as well as the interactions between these two memory systems.
MeSH term(s)	Animals ; Behavior Rating Scale ; Cognition/drug effects ; Cognition/physiology ; Cues ; Female ; Hippocampus/drug effects ; Hippocampus/physiology ; Male ; Maze Learning/drug effects ; Maze Learning/physiology ; Memory/drug effects ; Memory/physiology ; Muscimol/pharmacology ; Prefrontal Cortex/drug effects ; Prefrontal Cortex/physiology ; Rats
Chemical Substances	Muscimol (2763-96-4)
Language	English
Publishing date	2015-07-08
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Video-Audio Media
ISSN	1940-087X
ISSN (online)	1940-087X
DOI	10.3791/52667
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Article: A large 'Active Magnetic Shield' for a high-precision experiment: nEDM collaboration.

Abel, C / Ayres, N J / Ban, G / Bison, G / Bodek, K / Bondar, V / Bouillaud, T / Chanel, E / Chen, J / Chen, W / Chiu, P-J / Crawford, C B / Daum, M / Doorenbos, C B / Emmenegger, S / Ferraris-Bouchez, L / Fertl, M / Fratangelo, A / Griffith, W C /

Grujic, Z D / Harris, P / Kirch, K / Kletzl, V / Koss, P A / Krempel, J / Lauss, B / Lefort, T / Mullan, P / Naviliat-Cuncic, O / Pais, D / Piegsa, F M / Pignol, G / Rawlik, M / Rienäcker, I / Ries, D / Roccia, S / Rozpedzik, D / Saenz-Arevalo, W / Schmidt-Wellenburg, P / Schnabel, A / Segarra, E P / Severijns, N / Shelton, T / Svirina, K / Tavakoli Dinani, R / Thorne, J / Virot, R / Yazdandoost, N / Zejma, J / Ziehl, N / Zsigmond, G

The European physical journal. C, Particles and fields

2023 Volume 83, Issue 11, Page(s) 1061

Abstract: We present a novel Active Magnetic Shield (AMS), designed and implemented for the n2EDM experiment at the Paul Scherrer Institute. The experiment will perform a high-sensitivity search for the electric dipole moment of the neutron. Magnetic-field ... ...

Abstract	We present a novel Active Magnetic Shield (AMS), designed and implemented for the n2EDM experiment at the Paul Scherrer Institute. The experiment will perform a high-sensitivity search for the electric dipole moment of the neutron. Magnetic-field stability and control is of key importance for n2EDM. A large, cubic, 5 m side length, magnetically shielded room (MSR) provides a passive, quasi-static shielding-factor of about
Language	English
Publishing date	2023-11-20
Publishing country	France
Document type	Journal Article
ZDB-ID	1459069-4
ISSN	1434-6052 ; 1434-6044
ISSN (online)	1434-6052
ISSN	1434-6044
DOI	10.1140/epjc/s10052-023-12225-z
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Article ; Online: Publisher's Note: "The very large n2EDM magnetically shielded room with an exceptional performance for fundamental physics measurements" [Rev. Sci. Instrum. 93, 095105 (2022)].

Ayres, N J / Ban, G / Bison, G / Bodek, K / Bondar, V / Bouillaud, T / Clement, B / Chanel, E / Chiu, P-J / Crawford, C B / Daum, M / Doorenbos, C B / Emmenegger, S / Fratangelo, A / Fertl, M / Griffith, W C / Grujic, Z D / Harris, P G / Kirch, K /

Krempel, J / Lauss, B / Lefort, T / Naviliat-Cuncic, O / Pais, D / Piegsa, F M / Pignol, G / Rauscher, G / Rebreyend, D / Rienäcker, I / Ries, D / Roccia, S / Rozpedzik, D / Saenz-Arevalo, W / Schmidt-Wellenburg, P / Schnabel, A / Severijns, N / Shen, B / Staab, M / Svirina, K / Dinani, R Tavakoli / Thorne, J / Yazdandoost, N / Zejma, J / Zsigmond, G

The Review of scientific instruments

2022 Volume 93, Issue 11, Page(s) 119902

Language	English
Publishing date	2022-11-11
Publishing country	United States
Document type	Published Erratum
ZDB-ID	209865-9
ISSN	1089-7623 ; 0034-6748
ISSN (online)	1089-7623
ISSN	0034-6748
DOI	10.1063/5.0130257
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Article ; Online: Measurements of the Thermal Resistivity of InAlAs, InGaAs, and InAlAs/InGaAs Superlattices.

Jaffe, G R / Mei, S / Boyle, C / Kirch, J D / Savage, D E / Botez, D / Mawst, L J / Knezevic, I / Lagally, M G / Eriksson, M A

ACS applied materials & interfaces

2019 Volume 11, Issue 12, Page(s) 11970–11975

Abstract: Thermal management efforts in nanoscale devices must consider both the thermal properties of the constituent materials and the interfaces connecting them. It is currently unclear whether alloy/alloy semiconductor superlattices such as InAlAs/InGaAs have ... ...

Abstract	Thermal management efforts in nanoscale devices must consider both the thermal properties of the constituent materials and the interfaces connecting them. It is currently unclear whether alloy/alloy semiconductor superlattices such as InAlAs/InGaAs have lower thermal conductivities than their constituent alloys. We report measurements of the crossplane thermal resistivity of InAlAs/InGaAs superlattices at room temperature, showing that the superlattice resistivities are larger by a factor of 1.2-1.6 than that of the constituent bulk materials, depending on the strain state and composition. We show that the additional resistance present in these superlattices can be tuned by a factor of 2.5 by altering the lattice mismatch and thereby the phonon-mode mismatch at the interfaces, a principle that is commonly assumed for superlattices but has not been experimentally verified without adding new elements to the layers. We find that the additional resistance in superlattices does not increase significantly when the layer thickness is decreased from 4 to 2 nm. We also report measurements of 250-1000 nm thick films of undoped InGaAs and InAlAs lattice-matched to InP substrates, for there is no published thermal conductivity value for the latter, and we find it to be 2.24 ± 0.09 at 22 °C, which is ∼2.7 times smaller than the widely used estimates.
Language	English
Publishing date	2019-03-13
Publishing country	United States
Document type	Journal Article
ISSN	1944-8252
ISSN (online)	1944-8252
DOI	10.1021/acsami.8b17268
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Article ; Online: A Wireless EEG Recording Method for Rat Use inside the Water Maze.

Pinnell, Richard C / Almajidy, Rand K / Kirch, Robert D / Cassel, Jean C / Hofmann, Ulrich G

PloS one

2016 Volume 11, Issue 2, Page(s) e0147730

Abstract: With the continued miniaturisation of portable embedded systems, wireless EEG recording techniques are becoming increasingly prevalent in animal behavioural research. However, in spite of their versatility and portability, they have seldom been used ... ...

Abstract	With the continued miniaturisation of portable embedded systems, wireless EEG recording techniques are becoming increasingly prevalent in animal behavioural research. However, in spite of their versatility and portability, they have seldom been used inside water-maze tasks designed for rats. As such, a novel 3D printed implant and waterproof connector is presented, which can facilitate wireless water-maze EEG recordings in freely-moving rats, using a commercial wireless recording system (W32; Multichannel Systems). As well as waterproofing the wireless system, battery, and electrode connector, the implant serves to reduce movement-related artefacts by redistributing movement-related forces away from the electrode connector. This implant/connector was able to successfully record high-quality LFP in the hippocampo-striatal brain regions of rats as they undertook a procedural-learning variant of the double-H water-maze task. Notably, there were no significant performance deficits through its use when compared with a control group across a number of metrics including number of errors and speed of task completion. Taken together, this method can expand the range of measurements that are currently possible in this diverse area of behavioural neuroscience, whilst paving the way for integration with more complex behaviours.
MeSH term(s)	Action Potentials ; Animals ; Artifacts ; Behavior, Animal ; Electroencephalography/methods ; Female ; Maze Learning ; Rats, Sprague-Dawley ; Skull/anatomy & histology ; Task Performance and Analysis ; Water ; Wireless Technology
Chemical Substances	Water (059QF0KO0R)
Language	English
Publishing date	2016-02-01
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	1932-6203
ISSN (online)	1932-6203
DOI	10.1371/journal.pone.0147730
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Article ; Online: Probing the Solid Phase of Noble Metal Copper at Terapascal Conditions.

Fratanduono, D E / Smith, R F / Ali, S J / Braun, D G / Fernandez-Pañella, A / Zhang, S / Kraus, R G / Coppari, F / McNaney, J M / Marshall, M C / Kirch, L E / Swift, D C / Millot, M / Wicks, J K / Eggert, J H

Physical review letters

2020 Volume 124, Issue 1, Page(s) 15701

Abstract: ... compressed to peak pressures of 2.30 TPa and densities of nearly 30 g/cc, providing fundamental information ...

Abstract	Ramp compression along a low-temperature adiabat offers a unique avenue to explore the physical properties of materials at the highest densities of their solid form, a region inaccessible by single shock compression. Using the National Ignition Facility and OMEGA laser facilities, copper samples were ramp compressed to peak pressures of 2.30 TPa and densities of nearly 30 g/cc, providing fundamental information regarding the compressibility and phase of copper at pressures more than 5 times greater than previously explored. Through x-ray diffraction measurements, we find that the ambient face-centered-cubic structure is preserved up to 1.15 TPa. The ramp compression equation-of-state measurements shows that there are no discontinuities in sound velocities up to 2.30 TPa, suggesting this phase is likely stable up to the peak pressures measured, as predicted by first-principal calculations. The high precision of these quasiabsolute measurements enables us to provide essential benchmarks for advanced computational studies on the behavior of dense monoatomic materials under extreme conditions that constitute a stringent test for solid-state quantum theory. We find that both density-functional theory and the stabilized jellium model, which assumes that the ionic structure can be replaced by an ionic charge distribution by constant positive-charge background, reproduces our data well. Further, our data could serve to establish new international secondary scales of pressure in the terapascal range that is becoming experimentally accessible with advanced static and dynamic compression techniques.
Language	English
Publishing date	2020-01-27
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.124.015701
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Article: Qualitative and quantitative evaluation of

Xie, Yijing / Harsan, Laura-Adela / Bienert, Thomas / Kirch, Robert D / von Elverfeldt, Dominik / Hofmann, Ulrich G

Biomedical optics express

2017 Volume 8, Issue 2, Page(s) 593–607

Abstract: OCT has been demonstrated as an efficient imaging modality in various biomedical and clinical applications. However, there is a missing link with respect to the source of contrast between OCT and other modern imaging modalities, no quantitative ... ...

Abstract	OCT has been demonstrated as an efficient imaging modality in various biomedical and clinical applications. However, there is a missing link with respect to the source of contrast between OCT and other modern imaging modalities, no quantitative comparison has been demonstrated between them, yet. We evaluated, to our knowledge, for the first time
Language	English
Publishing date	2017-01-05
Publishing country	United States
Document type	Journal Article
ZDB-ID	2572216-5
ISSN	2156-7085
ISSN	2156-7085
DOI	10.1364/BOE.8.000593
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