Ulrich Hubner

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BACKGROUND AND PURPOSE It remains controversial whether the intra-arterial administration of papaverine (IAP) is effective in reversing vasospasm-associated cerebral hypoperfusion after aneurysmal subarachnoid hemorrhage. The aim of the present study was to continuously assess regional cerebral blood flow (rCBF) during and after IAP with the use of(More)
OBJECT Current clinical neuromonitoring techniques lack adequate surveillance of cerebral perfusion. In this article, a novel thermal diffusion (TD) microprobe is evaluated for the continuous and quantitative assessment of intraparenchymal regional cerebral blood flow (rCBF). METHODS To characterize the temporal resolution of this new technique, rCBF(More)
Controllable adiabatic evolution of a multi-qubit system can be used for adiabatic quantum computation (AQC). This evolution ends at a configuration where the Hamiltonian of the system encodes the solution of the problem to be solved. As a first steps towards realization of AQC we have investigated two, three and four flux qubit systems. These systems were(More)
As an alternative to the shadow evaporation method for the preparation of ultrasmall tunnel junctions we have established the so-called self-aligned in-line technique. It was applied to the fabrication of common Al/AlO/sub x//Al-type and, for the first time, Nb/AlO/sub x//Nb-based single-electron transistors. The characterization of the samples at(More)
Descriptions are given of the most significant types of defects and their implication on delay effects and overcurrents for different classes of CMOS circuits. Delay fault testing and built-in current testing have emerged as the most promising methods in CMOS testing for high fault coverage. Based on different types of transistor circuits, an analysis is(More)
Using the so-called self-aligned in-line technique, we have fabricated single electron transistors based on the metals aluminum, tantalum and chromium. The material deposition was carried out without exception by sputtering. The samples were electrically characterized both in a dilution refrigerator and in a helium-3 cryostat. In case of transistors made(More)
We describe a novel giant magnetoresistive (GMR) stack geometry which enables the counting of the number of turns of a rotating magnetic field. A race-track-like spiral of N turns acts as a 180deg domain-wall memory. At one end of the spiral, an enlarged film area works as a domain-wall generator. Due to the small width of the spirals themselves in the(More)
4. Kaufmann AM, Firlik AD, Fukui MB, Wechsler LR, Jungries CA, Yonas H. Ischemic core and penumbra in human stroke. Stroke. 1999;30:93–99. Response Dr Vajkoczy and colleagues present an intriguing observation that appears to have been beneficial to the patient. Although we are cautious in interpreting these limited experiences in terms of efficacy, these(More)
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