vi, 73 p. A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number. / At the beginning of the 20th century, several critics suggested that the genre of the novel was in a state of crisis. A vigorous discussion about whether the genre of the novel as a whole had to be done away with erupted and produced contradicting frameworks. A textual analysis of two recent books by Swiss writer Tim Krohn, Quatemberkinder (1998) and Vrenelis Gartli (2004), reveals that the time of great epics in the form of the novel has not yet come to an end. Krohn's novels portray a new approach to counter what Lukacs called "transcendental homelessness." By combining oral Swiss legends with historical facts and magic realism Krohn is able to achieve a new wholeness the modem novel lacked. His novels portray a possible solution for overcoming the "crisis of the novel." / Committee in Charge: Prof. Susan C. Anderson, Chair; Prof. Kenneth Scott Calhoon; Prof. Martin Klebes

Geógrafo / La presente memoria analiza la variabilidad climática que presentan las precipitaciones en el centro y sur de Chile, con el propósito de dilucidar su comportamiento y características pluviométricas, y establecer la influencia que ejercen sobre ellas la disposición geográfica. Para esto se utilizaron 109 estaciones meteorológicas, las cuales corresponden al período 1965-2012. Se han empleado múltiples indicadores de variabilidad: Coeficiente de Variación (CV), Irregularidad Temporal (S), Concentración Mensual (PCI) e Índice de Concentración (CI), además de los principales patrones de teleconexión que afectan a Chile centro-sur: El Niño Oscilación del Sur, Oscilación Decadal del Pacífico y Oscilación Antártica (ENSO, PDO, AAO). Los resultados permiten establecer gradientes de los índices aplicados, los que disminuyen su variabilidad conforme aumenta la latitud, lo cual es consistente con el reparto estacional de las precipitaciones. Los patrones de teleconexión analizadas no afectan de igual modo a toda la región estudiada, de hecho el SOI (fase negativa) y la PDO (fase positiva) se relacionan con mayor precipitación al norte de la región de La Araucanía (PDO en el margen litoral, mientras que el SOI hacia la Depresión central y la cordillera), mientras que la AAO (fase negativa) se asocia a mayores precipitaciones tanto al norte de los 36°S como al sur de los 40°S, con algunas excepciones del valle central.

No description available.

No description available.

Sanjeev R. Kulkarni and Ofer Zeitouni. / Cover title. / Includes bibliographical references (leaf 6). / Research supported by the U.S. Army Research Office. DAAL03-86-K-0171 Research supported by the Office of Naval Research under an Air Force contract. F19628-90-C-0002

M.S.

The dissertation presents two distinct but related studies of foam. The initial investigation involves the evaluation of a method of controlling foaming in aerated fermenters; the second involves the evaluation of a method of characterization of durable foams. Since foaming has frequently been a problem of considerable magnitude in aerated waste treatment and various other aerated cultures, a method was conceived which involved the disruption of foam at the liquid-foam interface during carriage as a result of an accelerated converging flow through a down flow draft tube. The principles of the method were based on the creation of differential shearing forces at the foam-liquid interface to cause disruption of foam at the interface and subsequent re-entrainment during the convergence of flow through the down flow draft tube. The geometry of the inlet to the draft tube, recirculation rate, and hydraulic head over the inlet were principal variables affecting the degree of foam control. Foam control performance increased with increased diameter of the inlets as a result of the reduced tendencies of foam to span or 2 bridge inlets of larger size. Increased recirculation rate and low hydraulic head over the inlet offered the greatest potential relative to foam re-entrainment; however, the conditions of increased recirculation rate and low hydraulic head resulted in air being drawn into the draft tube in addition to the foam-liquid mixture. The foam subsequently re-appearlng at the liquid surface possessed a dense, fine hubble structure which was resistant to control. The method proved successful on a short-term basis in as much as operational times were extended to about six times those required to generate comparable volumes of foam while employing aeration only. For extended operational periods, the method resulted in resistant foams which defied control by the process. During the course of the foam control investigation a method was sought which could practically be employed to evaluate the durability properties of foams for routine characterization measurements.The natural collapse periods for foams resulting from the employed alkyl benzene sulfonate (ABS) solutions were of such duration to be impractical for repetitive measurements. A method was conceived whereby the destruction of teams could be accelerated by application of an external force. The method involved application of a weighted disc assembly to a definite volume of foam confined in a 3.75-inch inside diameter foam generation column. The principle of the method was based on the hypothesis that a measure of the durability properties of teams could he obtained relative to the rate of collapse under applied stress, The method was evaluated on foams generated from solutions containing ABS concentrations ranging from 20 to 120 ppm employing aeration rates of 0.75, 1.5, and 2.45 l/min, Measurements consisted of recording the level of disc descent at one-minute intervals until the disc reached the liquid surface, The results were presented as disc descent rates or slopes of the disc descent curves for each measurement. Experiments employing static decay methods were performed to observe the behavior of foams subjected to destruction due to natural causes, Measurements consisted of observing the remaining foam level at one-half hour intervals for a total period of eight hours. The results were presented graphically as foam collapse vs time curves and quantitatively in terms of the average lifetime of the teams. The results of the experiments employing the weighted disc and the experiments employing static decay methods agreed insofar as the durability properties of foam were enhanced by increased ABS concentration and low aeration rate. The results of both methods indicated that, on a comparative basis of the data and by a statistical analysis of the data, aeration rate had a more pronounced effect on foam character than ABS concentration for the ranges of the variables employed in the investigation. The periods required for completion of the measurements of the weighted disc experiment: ranged from about 10 to 25 minutes which represent a considerable saving in time in comparison to the length of experiments employing static decay procedures. The rapidity and simplicity of the method employing the weighted disc appear to make this method applicable for routine characterization measurements of durable foams. / Ph. D.

In this thesis the various characteristics of a neuron are discussed at some length. Particular attention is given to the more important features which determine the input and output characteristics and the responses of a neuron. Included are both of the major inhibition characteristics: presynaptic inhibition (depolarization), and postsynaptic inhibition (hyperpolarization). The simulation presented uses a single 12 volt power supply, operates on pulses which swing in the negative direction, has a high input impedance and a low output impedance, may be easily modified to adjust the response characteristics to individual system needs, and uses only 132 milliwatts power. Input pulses are weighted and transmitted to the summation circuit by a common collector stage which provides isolation of the inputs from the summation circuitry. A hyperpolarization input raises the resting voltage at the summation circuit, requiring more stimulation to lower the summation voltage to the threshold value. This inhibition follows a predetermined time course, The simulation will produce output pulses as long as the voltage at the summation circuit is below the threshold value. These pulses have a duration of 0.7 ms. and are followed by a refractory period of about one millisecond. A depolarization input lowers the amplitude of the output pulse by a predetermined time course. / Master of Science

No description available.

No description available.