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Article
Aggregation in Pickering emulsions
For the first time, the particle distribution and aggregation in Pickering emulsions were made visible by transmission X-ray microscopy. Oil/water emulsions were stabilized by heterocoagulates of a clay miner...
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Chapter
Aggregation of Colloids Observed by X-Ray Microscopy
Many aggregation processes of colloidal particles take place in an aqueous phase. Thus, to ensure a detailed visualisation of the aggregation processes it is necessary to image the aggregates within this envir...
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Chapter and Conference Paper
Interaction of colloidal soil particles, humic substances and cationic detergents studied by X-ray microscopy
The interaction of soil colloids with humic substances and cationic detergents has been studied by X-ray microscopy. The major advantages of X-ray microscopy for these studies are the much higher resolution th...
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Article
Towards a synthesis method for distributed safety controllers based on net condition/event systems
An idea is presented for the synthesis of modular distributed controllers for forbidden state problems. The model of the uncontrolled plant behaviour is designed in a modular way by net condition/event systems...
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Article
Fractal characterization of hematite aggregates by X-ray microscopy
X-ray microscopy supplies the actual morphology of hematite aggregates in an aqueous dispersion medium. The fractal dimension of hematite aggregates has been determined below and above the critical coagulation...
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Chapter and Conference Paper
X-ray microscopy studies of aqueous colloid systems
X-ray microscopy is capable of imaging objects with a higher resolution than light microscopy. The reason is the shorter wavelength of x-rays compared to visible light. Up to now, the smallest structures that ...
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Chapter and Conference Paper
Direct imaging of aggregates in aqueous clay-suspensions by x-ray microscopy
The applicability of x-ray microscopy for the direct investigation of clay aggregates in water is demonstrated. As coagulating agents Ca2+, an anionic and a cationic detergent were used. The internal structures o...
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Chapter and Conference Paper
A Laboratory X-Ray Microscope with a Plasma X-Ray Source
A laboratory x-ray microscope has been built with zone plate optics and a pulsed plasma x-ray source. X-ray images of metal patterns, diatoms and 3T3 mouse cells have been taken with sub-optical resolution at ...
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Chapter and Conference Paper
Investigations of Wet Biological Specimens with the X-Ray Microscope at BESSY
The ability to interact with the environment is an essential feature of living biological systems and corresponds critically to their sensitivity to changes of environmental conditions. The investigation of bi...
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Chapter and Conference Paper
Germanium Phase Zone Plates with High Aspect Ratios for X-Ray Microscopy Experiments
Phase zone plates with high efficiencies are required in x-ray microscopy to meet the demands of imaging specimens with a low radiation dose and a high contrast. Since the size of the resolution element is equ...
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Chapter and Conference Paper
Experimental Characterization of Zone Plates for High Resolution X-Ray Microscopy
Micro zone plates with outermost zone widths of 40 nm, 35 nm and 30 nm have been used and characterized in the Göttingen x-ray microscope at BESSY. These were made through a collaboration between the IBM T.J. ...
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Chapter and Conference Paper
X-Ray Microscopy Investigations on Polytene Chromosomes Isolated from Salivary Glands of Chironomus thummi Larvae
X-ray microscopy allows the investigation of the ultrastructure of biological samples in their native state with higher resolution than can be achieved with optical microscopy. We have used an X-ray microscope...
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Chapter and Conference Paper
Octopusperimetrie bei Pseudophakie
An einer Gruppe von 38 Patienten ohne Glaukom, die nach einer komplikationslosen extrakapsulären Kataraktextraktion mit einer Hinterkammerlinse versorgt wurden, führten wir mit dem automatischen Perimeter „OCT...
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Chapter and Conference Paper
Ultraschalldiagnostik nach Contusio bulbi bei Pseudophakie
Von 1987 bis 1989 wurden in der Ultraschallabteilung der Charité-Augenklinik acht pseudophake Patienten nach einer Contusio bulbi untersucht, bei denen die Intraokularlinse ophthalmoskopisch nicht sicher zu lo...
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Chapter and Conference Paper
Status of a Laboratory X-Ray Microscope
X-ray microscopy experiments using x-ray optical systems are performed with synchrotron radiation of electron storage rings. The highest resolution obtained up to now in such experiments is about 50 nm. The ex...
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Chapter and Conference Paper
Phase Zone Plates for the Göttingen X-Ray Microscopes
For biological and medical research it is important to be able to look at living and therefore wet specimens. As was pointed out by H. WOLTER [1] in 1952, an X-ray microscope operating in the wavelength region...
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Chapter and Conference Paper
The Göttingen Scanning X-Ray Microscope
A scanning X-ray microscope (SXM) is in operation at the BESSY electron storage ring. Images with 0.1 pm resolution have been obtained. The scanning time is less than 10 ms per image point at a measured photon...
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Chapter and Conference Paper
Theoretical Investigations of Imaging Properties of Zone Plates Using Diffraction Theory
Based on Kirchhoff’s diffraction theory, the modulation transfer function MTF has been calculated as a criterion for the imaging quality of a micro zone plate. The micro zone plate will be used for imaging wit...
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Chapter
Lenses for Soft X-Rays and X-Ray Microscopy Experiments
X-ray microscopy can be used for investigations in the fields of biology, medicine, physics, especially materials science and probably other fields. as e.g. polymer science. In biology, it is possible to inves...
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Chapter and Conference Paper
Construction of Condenser Zone Plates for a Scanning X-Ray Microscope
A scanning x-ray microscope consists of an optical system, which images the source of x-ray light into a very small scan spot. An object can be scanned through it and because all optical elements that absorb r...
