81 |
Anodické pájení sendvičových struktur / Anodic bonding of sandwich structuresUrbánek, Petr January 2013 (has links)
This master thesis deals with the technology anodic soldering. It focuses mainly on soldering sandwich glass-silicon structures. Describes the soldering method and highlights its advantages. Theoretically discusses the different methods used soldering these structures and assess their possible benefits. This work explores practical ways possible soldering methods on a particular device. These different soldering methods evaluated on the basis of achieved quality connections. This thesis examines the anodic soldering at low temperatures, while there are demands on the shortening of the technological process.
|
82 |
Nanostrukturované vrstvy polovodivých oxidů kovů v plynových senzorech / Nanostructured layers of semiconducting metal oxides in gas sensorsBartoš, Dušan January 2014 (has links)
This diploma thesis discusses the gas sensor preparation via anodic oxidation. It names sensor types, deals with the sensing principle of electrochemical sensors in detail and submits sensor parameters. It describes preparation technology and characterization technology methods. In the experimental part, it focuses on both the measurement methodology and the electrochemical oxygen sensor covered with titanium dioxide nanocolumns fabrication. Not the least it discusses acquired research results.
|
83 |
Zvyšující měnič napětí / Step-up switched power sourceŽamberský, Jan January 2016 (has links)
Práce se zabývá popisem jednotlivých typů zdrojů s důrazem na izolované topologie. Poté je rozebírána nejvhodnější volba pro zdroj na anodické bondování, kde jsou kladeny požadavky na vysoké výstupní napětí s malým proudem. Další část rozebírá problematická místa návrhu a na co je třeba dávat pozor. Poté je proveden vlastní návrh zdroje s popisem optimalizačních kroků. Tento zdroj je odsimulován. Dva rozdílné přístupy k realizaci takového zdroje jsou poté porovnány a nejlepší je vybrán. Je ukázána možnost, jak realizovat bipolární výstup. V poslední části je tento zroj sestaven a proměřeny jeho parametry.
|
84 |
Studium chování buněk na nanostrukturovaných TiO2 površích / Nanostructured TiO2 as the surface for the investigation of cell behaviourPoláková, Kateřina January 2016 (has links)
This thesis deals with the study of cells on nanostructured surfaces of titanium dioxide, which are produced by the electrochemical method called anodic oxidation. The theoretical part is formed by an overview of manufacturing nanostructured surfaces using anodic oxidation method. It mentions the influence of external factors on the geometric parameters of the structure and description of methods of characterization structures. Furthermore there is processed outline of use for biomedical application and the description of interaction of the cell with surface. The practical part includes description of the production of nanoporous and nano-tubular structures made on thin films of titanium by direct method of anodic oxidation on which was studied the influence of external factors. Described a procedure and production of nanorods structures and nanodots generated using alumina template (AAO) which is subsequently carried out the study of the behavior of cells, which includes tests of adhesion, examination of morphology of cells, assays of proliferation and differentiation. Structures are under investigation of the interaction of cells with the nanostructured layer compared with the smooth surface of the titanium dioxide.
|
85 |
Cylindrical Magnetic Nanowires Towards Three Dimensional Data StorageMohammed, Hanan 12 1900 (has links)
The past few decades have witnessed a race towards developing smaller, faster,
cheaper and ultra high capacity data storage technologies. In particular, this race
has been accelerated due to the emergence of the internet, consumer electronics,
big data, cloud based storage and computing technologies. The enormous increase
in data is paving the path to a data capacity gap wherein more data than can be
stored is generated and existing storage technologies would be unable to bridge this
data gap. A novel approach could be to shift away from current two dimensional
architectures and onto three dimensional architectures wherein data can be stored
vertically aligned on a substrate, thereby decreasing the device footprint. This thesis
explores a data storage concept based on vertically aligned cylindrical magnetic
nanowires which are promising candidates due to their low fabrication cost, lack of
moving parts as well as predicted high operational speed. In the proposed concept,
data is stored in magnetic nanowires in the form of magnetic domains or bits which
can be moved along the nanowire to write/read heads situated at the bottom/top of
the nanowire using spin polarized current.
Cylindrical nanowires generally exhibit a single magnetic domain state i.e. a
single bit, thus for these cylindrical nanowire to exhibit high density data storage, it
is crucial to pack multiple domains within a nanowire. This dissertation
demonstrates that by introducing compositional variation i.e. multiple segments
along the nanowire, using materials with differing values of magnetization such as
cobalt and nickel, it is possible to incorporate multiple domains in a nanowire. Since
the fabrication of cylindrical nanowires is a batch process, examining the properties
of a single nanowire is a challenging task. This dissertation deals with the
fabrication, characterization and manipulation of magnetic domains in individual
nanowires. The various properties of are investigated using electrical
measurements, magnetic microscopy techniques and micromagnetic simulations.
In addition to packing multiple domains in a cylindrical nanowire,
this dissertation reports the current assisted motion of domain walls along
multisegmented Co/Ni nanowires, which is a fundamental step towards achieving a
high density cylindrical nanowire-based data storage device.
|
86 |
On the stability of current collectors in high-voltage lithium-ion batteries containing LiFSI electrolytesCarlö, Kevin January 2023 (has links)
The increasing energy demand requires a transition from fossil fuels to renewable resources. Lithium-ion batteries (LIBs) offer a promising solution as efficient energy storage devices. However, the aluminum current collector (CC) in LIBs is susceptible to anodic dissolution above 3 V vs. Li+/Li in commercial carbonate liquid electrolytes, compromising the battery performance. In this study, various approaches were explored to mitigate anodic dissolution in LiFSI EC:DEC at high voltages of the aluminum CC in LIBs, employing cyclic voltammetry (CV) and scanning electron microscopy (SEM). It was found that boiling the Al foil in water in an air atmosphere to increase the thickness of the surface Al2O3 layer improved the anodic stability and offered enhanced protection against proton attack (due to the oxidation of the carbonate solvent at high voltage). However, increasing the LiFSI electrolyte concentration to 2 M did not increase the anodic stability due to the absence of a passivating AlF3 layer. Notably, in 4 M LiFSI, impurity-induced high F- concentration facilitated the formation of a passivating AlF3 layer, resulting in improved anodic stability. Moreover, specific volume ratios of LiFSI EC:DEC and 1 M LiPF6 EC:DEC (1:1) (LP40) yielded the F- concentration necessary for forming a passivating AlF3 layer and significantly enhanced the anodic stability. On the other hand, carbon-coating the Al foil did not show significant improvements regarding the anodic stability. It was found that the corrosion was time-dependent at a low scan rate, a drastic anodic dissolution of the aluminum was seen at higher temperatures, and the corrosion also became more pronounced. At room temperature, carbon-coated Al foils exhibited increased stability.
|
87 |
DEVELOPMENT OF DIMETHYL ETHER (DME) AND CARBON DIOXIDE SENSORS USING PLATINUM NANOPARTICLES AND THICK FILM TECHNOLOGYPhotinon, Kanokorn January 2007 (has links)
No description available.
|
88 |
Third Generation Point-of-Care Device for Quantification of Zinc in Blood SerumZerhusen, Benjamin January 2017 (has links)
No description available.
|
89 |
PARAMETRIC EXPLORATION OF AUTOMATED FABRICATION AND ANODIC BONDING OF CPS FOR LHP APPLICATIONSPARIMI, SRINIVAS 17 April 2003 (has links)
No description available.
|
90 |
MEMS BASED FABRY PEROT PRESSURE SENSOR AND NON-ADHESIVE INTEGRATION ON OPTICAL FIBER BY ANODIC BONDINGSARAN, ANISH 01 July 2004 (has links)
No description available.
|
Page generated in 0.2758 seconds