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Kombination von zweiphotonenbasiertem direktem Laserschreiben mit großflächiger und hochpräziser Nanopositionierung
Im Bereich der Mikro- und Nanofabrikation ist das direkte Laserschreiben eine vielversprechende Technik zur maskenlosen Strukturierung von Photolacken. Mittels Zwei-Photonen-Absorption (2PA) kann das Laserschreiben auch zur Herstellung von dreidimensionalen Bauteilen mit minimalen Strukturbreiten von sub-100nm verwendet werden. Mit der optischen Präzision gehen auch Forderungen an die Präzision der Mess- und Positioniersysteme einher, um den technischen Stand von zweiphotonenbasiertem Laserschreiben weiter voranzutreiben. Zur Kombination von Nanopositionier- und Nanomessmaschinen (NPM-Maschinen) mit 2PA-Laserschreiben wird ein Konzept entwickelt und umgesetzt sowie der daraus entstandene Aufbau charakterisiert. Sowohl die großflächige als auch die hochpräzise Positionierung eröffnen neue Möglichkeiten in der Fabrikation. Insbesondere ist die hohe Präzision ausschlaggebend für Untersuchungen zur Unterschreitung der Beugungsbegrenzung bei Laserschreibprozessen.
Fundamentals of Computer Programming with C#
The free book "Fundamentals of Computer Programming with C#" is a comprehensive computer programming tutorial that teaches programming, logical thinking, data structures and algorithms, problem solving and high quality code with lots of examples in C#. It starts with the first steps in programming and software development like variables, data types, conditional statements, loops and arrays and continues with other basic topics like methods, numeral systems, strings and string processing, exceptions, classes and objects. After the basics this fundamental programming book enters into more advanced programming topics like recursion, data structures (lists, trees, hash-tables and graphs), high-q...
Bulgarians by Birth
Bulgarians by Birth is a collection of sources concerning the revolt of the Comitopuls and the Empire of Samuel, as well as the war between Bulgaria and Byzantium in the late 10th and early 11th century. Each source is accompanied by an extensive commentary. It is the first collection of sources in translation on this topic to be published.
Endodontic Radiology
Endodontic Radiology, 2nd edition, is a unique reference that examines all aspects of radiographic imaging related to endodontics. Dr. Bettina Basrani and a team of prestigious international contributors build upon traditional radiographic techniques and include the latest information available on digital radiographs and cone beam computed tomography. More than an overview of equipment, the book delves into radiographic interpretation, differential diagnosis, technical difficulties and special circumstances when taking radiographs during the endodontic treatment, and how to choose the correct radiographic technique to obtain the desired images. Chapters explain general radiographic techniques; intraoral techniques; standard radiographs and interpretation; digital radiographs and their manipulation, storage, and interpretation; and CBCT principles, techniques, and clinical considerations.
Who's who
None
Bulgaria
The communist regime in Bulgaria was perhaps the most stable in Eastern Europe and its demise was brought about only by the general collapse of the Soviet bloc. In the light of this, what is surprising about the country's transitions to democracy and a market economy is not that it has been uneven but that it has proceeded without fundamental disruptions and is now showing some signs of consolidation. The two-party system that emerged from the round-table negotiations in 1990 has survived remarkably intact although the parties within it have undergone considerable transformations. The institutions of democracy have often been misused but have shown their ability to survive in crisis situations. After a dismal record of macroeconomic mismanagement, the establishment of a currency board has brought stability to the country's economy, and the long-delayed structural reform is finally off the ground. Having survived the trials of transition, Bulgaria is now faced with the more difficult task of adapting its political and economic institutions to the requirements of future EU membership.
