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Article
Progress in Noise Thermometry at 505 K and 693 K Using Quantized Voltage Noise Ratio Spectra
Technical advances and new results in noise thermometry at temperatures near the tin freezing point and the zinc freezing point using a quantized voltage noise source (QVNS) are reported. The temperatures are ...
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Chapter and Conference Paper
Magnetic Detection of the Sentinel Lymph Node in Ex Vivo Tissue with Colorectal Cancer
A new method for sentinel lymph node detection was investigated by ex-vivo experiments in colorectal cancer. A dispersion of superparamagnetic iron oxide (SPIO) nanoparticles was injected in the resected tissu...
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Chapter and Conference Paper
II.2 Cuprate and other unconventional superconductors
Remarkably rich physics is involved in the behavior of hybrid Josephson junctions, connecting high-Tc and low-Tc superconductors. This relates in particular to the different order parameter symmetries underlying ...
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Chapter and Conference Paper
Improvements in Sorption Compressor Design
A single sorption compressor cell that is thermally cycled provides an intermittent flow. For a Joule-Thomson expansion stage, a more or less continuous flow is required. The standard method to obtain a contin...
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Chapter and Conference Paper
Progress in Micro Joule-Thomson Cooling at Twente University
At the University of Twente, research on the development of a sorption-based micro cooler is in progress. Because of the absence of moving parts, such a cooler is virtually vibration free and highly durable, w...
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Chapter and Conference Paper
Development of a 4K Sorption Cooler for ESA’s Darwin Mission: System-Level Design Considerations
ESA’s Darwin mission is a future space interferometer that consists of six free-flying telescopes. To guarantee a proper mechanical stability of this system, hardly any vibration of the optical system with int...
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Article
Pulsed-laser deposition of MgB2 and B thin films
Thin films of the novel superconductor MgB2 were deposited from an Mg-enriched MgB2 target or by alternating ablation from Mg and B targets, depositing multilayers. The superconducting films were achieved in situ...
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Chapter
Construction and Operation of a 165 K Microcooler with a Sorption Compressor and a Micromachined Cold Stage
This paper presents the integration and testing of a 165 K microcooler that operates with a sorption compressor and a micromachined cold stage. Attractive features of this combination are the lack of vibration...
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Chapter
High-Tc SQUID Based Gradiometer Cooled by a Cryotiger Gas-mixture Cooler
We investigated the feasibility of a high-Tc SQUID system for fetal magnetocardiography aiming at a system without a magnetically shielded room and cooled by a cryocooler. For demonstration purposes, we have sele...
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Chapter
Fast Gas-Gap Heat Switch for a Microcooler
A sorption compressor requires heat switches to thermally isolate the cells during heating, and to connect them to a heat sink during cooling. The requirements for these heat switches are discussed and related...
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Chapter
Interference Characterization of Cryocoolers for a High-Tc SQUID-Based Fetal Heart Monitor
The FHARMON-project at the University of Twente aims at a high-Tc SQUID based fetal heart monitor for use in standard clinical environments. Besides the suppression of environmental magnetic noise, the cooling...
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Chapter
165 K Microcooler Operating with a Sorption Compressor and a Micromachined Cold Stage
This paper presents the fabrication of a microcooler consisting of small stainless steel sorption compressor cells, micromachined silicon check valves, and a micromachined cold stage that incorporates glass-tu...
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Chapter
Construction and Tests of a High-Tc SQUID-Based Heart Scanner Cooled by Small Stirling Cryocoolers
A heart scanner that can be equipped with up to 25 high-T c SQUID magnetometers was designed at the University of Twente. In this design the mechanical cooler interference is reduce...
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Chapter
Thermodynamic Considerations on a Microminiature Sorption Cooler
The sorption/Joule-Thomson cycle is a promising cycle for microscale cooling of low-temperature electronic devices because the cycle lacks moving parts. This facilitates scaling down to small sizes, eliminates...
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Chapter
Mechanism of silicon-mediated manganese tolerance of Cucumis sativus L.: Effect of silicon nutrition on manganese concentration in the intercellular washing fluid
In cucumber (Cucumis sativus L. cv. Chinesische Schlange) silicon (Si) supply clearly alleviates symptoms of manganese (Mn) toxicity. Despite of equal total Mn concentrations in the leaves, plants without Si supp...
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Chapter
Cryogenic Aspects of a Fetal Heart Monitor Based on High-Tc Squids
A high-Tc SQUID-based magnetometer system for measuring fetal heart activity in standard clinical environments is the goal of the so-called FHARMON project. To lower the threshold for the application of this feta...
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Article
Structural and electrical properties of La0.5Sr0.5CoO3 films on SrTiO3 and porous α-Al2O3 substrates
Films of La0.5Sr0.5CoO3 (LSCO) have been deposited on specially treated TiO2-terminated (001) SrTiO3 substrate surfaces and on macroporous polycrystalline α-Al2O3 substrates, having a mean pore diameter of 80 nm...
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Article
Imposed layer-by-layer growth by pulsed laser interval deposition
Pulsed Laser Deposition (PLD) has become a significant technique to study the thin film growth of novel materials. Here, one has benefited from the main advantages of PLD, the relative easy stoichiometric tra...
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Article
Passivating TiO2 coatings for silicon solar cells by pulsed laser deposition
Pulsed laser deposition was used to deposit TiO2 anti-reflection coatings for silicon solar cells. We deposited smooth coatings with an optimal refractive index of 2.3 for use as anti-reflection coating. The int...
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Article
Field measurements of gas exchange in Avicennia marina and Bruguiera gymnorrhiza
Diurnal gas exchange characteristics were measured simultaneously in two mangrove species, Avicennia marina and Bruguiera gymnorrhiza, over 7 d in summer (February–March), to compare their productivity. The st...
