Zugl.: Chemnitz, Techn. Univ., Diss., 2006.

This study provides an overall view of the significant change in compositional creation and performance practices in the nineteenth century. One witnesses concerto has become an important genre to demonstrate the technical playing of violin. In addition, through various violin schools, violin performances have developed different styles of playing. Bruch was an important German composer in the late romantic period. Although his status is not sublime as Schumann, Mendelssohn and Brahms, his ¡§Violin Concerto No. 1 in G minor Op. 26¡¨ is well received. Among numerous violin concertos in the nineteenth century, the work is regarded as an essential piece for violinist and in fact up to the present the work has been often performed and included in most concert programs. The most significant in Bruch¡¦s music is his employment of different performance techniques together with beautiful violin voicing. He believes ¡§melody is the soul of music¡¨ and demonstrates with his individual performance, and this explains the long lasting character. The value of Bruch¡¦s music is equal fame of the composition well regarded as his contemporaries. This thesis is divided into three chapters. The First chapter discusses about the succession of the violin performance technique, the influences of violin schools on violin music, and elaboration of the violin concerto features. The Second chapter includes Bruch¡¦s life, the historical background of his Op. 26 and its status. The Third chapter focuses on the performance techniques, examine the sophisticated techniques on both right hand and left hand. Its incorporation with orchestra will also be discussed in this chapter. And followed by a conclusion. Through the research of this work, author, hopefully, could help violinists will not only focus on the technique stage but also convey the idea of the composer more accurately while playing this work.

Techn. Universiẗat, Diss., 2002--Berlin.

Universiẗat, FB Medizin, Diss.--Hamburg, 2007.

Stuttgart, Univ., Diss., 2008.

Diss. Naturwiss. Bern. / Enth.: dt. Zusammenfassung. Literaturverz.

Chemnitz, Techn. Univ., Diss., 2006.

Um die Leistung eines Zerkleinerungsprozesses zu maximieren, kann die Effektivität eines Kegelbrecher-Designs schnell und präzise durch ROCKY DEM evaluiert werden. Tatsächlich brechen Partikel, wenn sie einer ausreichenden Stoßenergie ausgesetzt sind. Diese Energie ist die ausgeführte Arbeit des Systems, um ein Teilchen zu brechen. Weiterhin berücksichtigt das Potapov-Donaue-Bruchmodell die Bruchfestigkeit der Teilchen und M. M ist eine Materialkonstante, die mit der Fragmentgrößenverteilung zusammenhängt. Diese Parameter werden durch ein Kalibrierverfahren ausgewählt, das eine Reihe von Freien-Tropfen-Labortests beinhaltet. Die Anzahl der notwendigen Tests hängt von den probabilistischen Überlegungen zu den Ergebnissen. Sobald die Parameter erhalten sind, wird eine ROCKY-Diskrete-Element-Methode-Simulation eines Kegelbrechers durchgeführt. Zuerst werden die Teilchen über dem Brecher kumuliert. Danach dreht und kippt der Kegelbrecher, um die Partikel an den Innenwänden zu zerkleinern. Damit können wir zeigen, dass die Maximierung des Massenflusses für eine gegebene Teilchenverteilung erreicht wird.

Diss. (sammanfattning) Stockholm : Karol. inst., 2006. / Härtill 6 uppsatser.

The usage of more inexpensive silicon feedstock for the crystallization of multicrystalline silicon blocks promises cost reduction for the photovoltaic industry. Less expensive substrates made out of metallurgical silicon (MG-Si) are used as a mechanical support for the epitaxial solar cell. Moreover, conventional inert solar cells can be produced from up-graded metallurgical silicon (UMG-Si). This feedstock has higher content of impurities which influences cell performance and mechanical strength of the wafers. Thus, it is of importance to know these effects in order to know which impurities should be preferentially removed or prevented during the crystallization process. Solar cell processing steps can also exert a change in the values of mechanical strength of processed multicrystalline silicon wafers until the fabrication of a solar cell. Bending tests, fracture toughness and dynamic elastic modulus measurements are performed in this work in order to research the mechanical behavior of multicrystalline silicon crystallized with different qualities of silicon feedstock. Bending tests and residual stress measurements allows the quantification of the mechanical strength of the wafers after every solar cell processing step. The experimental results are compared with theoretical models found in the classical literature about the mechanical properties of ceramics. The influence of second phase particles and thermal processes on the mechanical strength of silicon wafers can be predicted and analyzed with the theoretical models. Metals like Al and Cu can decrease the mechanical strength due to micro-cracking of the silicon matrix and introduction of high values of thermal residual stress. Additionally, amorphous silicon oxide particles (SiOx) lower the mechanical strength of multicrystalline silicon due to thermal residual stresses and elastic mismatch with silicon. Silicon nitride particles (Si3N4) reduce fracture toughness and cause failure by radial cracking in its surroundings due to its thermal mismatch with silicon. Finally, silicon carbide (SiC) and crystalline silicon oxide (SiOx) introduce thermal residual stresses but can have a toughening effect on the silicon matrix and hence, increase the mechanical strength of silicon wafers if the particles are smaller than a certain size. The surface of as-cut wafers after multi-wire sawing presents sharp micro-cracks that control their mechanical behavior. Subsequent removal of these micro-cracks by texture or damage etching approximately doubles the mechanical strength of silicon wafers. The mechanical behavior of the wafers is then governed by defects like cracks and particles formed during the crystallization of multicrystalline silicon blocks. Further thermal processing steps have a minor impact on the mechanical strength of the wafers compared to as-cut wafers. Finally, the mechanical strength of final solar cells is comparable to the mechanical strength of as-cut wafers due to the high residual thermal stress introduced after the formation of the metallic contacts which makes silicon prone to crack.