Loss Modelling of Three-Level Inverters controlled with Space Vector Modulation Technique

The objective of this master’s thesis is to investigate the loss behavior of three-level ANPC inverter and compare it with conventional NPC inverter. The both inverters are controlled with mature space vector modulation strategy. In order to provide the comparison both accurate and detailed enough NPC and ANPC simulation models should be obtained. The similar control model of SVM is utilized for both NPC and ANPC inverter models. The principles of control algorithms, the structure and description of models are clarified. The power loss calculation model is based on practical calculation approaches with certain assumptions. The comparison between NPC and ANPC topologies is presented based on results obtained for each semiconductor device, their switching and conduction losses and efficiency of the inverters. Alternative switching states of ANPC topology allow distributing losses among the switches more evenly, than in NPC inverter. Obviously, the losses of a switching device depend on its position in the topology. Losses distribution among the components in ANPC topology allows reducing the stress on certain switches, thus losses are equally distributed among the semiconductors, however the efficiency of the inverters is the same. As a new contribution to earlier studies, the obtained models of SVM control, NPC and ANPC inverters have been built. Thus, this thesis can be used in further more complicated modelling of full-power converters for modern multi-megawatt wind energy conversion systems.

Development of a bovine adenovirus type 2-based gene delivery vector /

ABSTRACT Recombinant adenoviruses are currently under intense investigation as potential gene delivery and gene expression vectors with applications in human and veterinary medicine. As part of our efforts to develop a bovine adenovirus type 2 (BAV2) based vector system, the nucleotide sequence of BAV2 was determined. Sixty-six open reading frames (ORFs) were found with the potential to encode polypeptides that were at least 50 amino acid (aa) residue long. Thirty-one of the BAV2 polypeptide sequences were found to share homology to already identified adenovirus proteins. The arrangement of the genes revealed that the BAV2 genomic organization closely resembles that of well-characterized human adenoviruses. In the course of this study, continuous propagation of BAV2 over many generations in cell culture resulted in the isolation of a BAV2 spontaneous mutant in which the E3 region was deleted. Restriction enzyme, sequencing and PCR analyses produced concordant results that precisely located the deletion and revealed that its size was exactly 1299 bp. The E3-deleted virus was plaque-purified and further propagated in cell culture. It appeared that the replication of such a virus lacking a portion of the E3 region was not affected, at least in cell culture. Attempts to rescue a recombinant BAV2 virus with the bacterial kanamycin resistance gene in the E3 region yielded a candidate as verified with extensive Southern blotting and PCR analyses. Attempts to purify the recombinant virus were not successful, suggesting that such recombinant BAV2 was helper-dependent. Ten clones containing full-length BAV2 genomes in a pWE15 cosmid vector were constructed. The infectivity of these constructs was tested by using different transfection methods. The BAV2 genomic clones did appear to be infectious only after extended incubation period. This may be due to limitations of various transfection methods tested, or biological differences between virus- and E. co//-derived BAV2 DNA.

Histogram filtering as a tool in variational Monte Carlo optimization

Optimization of wave functions in quantum Monte Carlo is a difficult task because the statistical uncertainty inherent to the technique makes the absolute determination of the global minimum difficult. To optimize these wave functions we generate a large number of possible minima using many independently generated Monte Carlo ensembles and perform a conjugate gradient optimization. Then we construct histograms of the resulting nominally optimal parameter sets and "filter" them to identify which parameter sets "go together" to generate a local minimum. We follow with correlated-sampling verification runs to find the global minimum. We illustrate this technique for variance and variational energy optimization for a variety of wave functions for small systellls. For such optimized wave functions we calculate the variational energy and variance as well as various non-differential properties. The optimizations are either on par with or superior to determinations in the literature. Furthermore, we show that this technique is sufficiently robust that for molecules one may determine the optimal geometry at tIle same time as one optimizes the variational energy.

Respuesta funcional de Toxorhynchites theobaldi (DYAR y KNAB) sobre larvas de Aedes aegypti (LINN.) vector del dengue

Tesis (Maestría en Ciencias con Especialidad en Entomología Médica) UANL

Control del vector del dengue Aedes aegypti (l) con la participación de estudiantes de primaria como educadores de salud en la cuidad de Guadalupe Nuevo Léon

Tesis (Maestria en Ciencias con Especialidad en Entomología Médica) UANL

Comparación de la eficiencia de rociados domiciliares en ultra bajo volumen (ULV) y termonebulización para el control de poblaciones adultas del vector del dengue Aedes aegypti (L.) en una colonia de Guadalupe, Nuevo León, México

Tesis (Maestría en Ciencias con Especialidad en Entomología Médica) UANL

Bionomia de Aedes aegypti L., vector del dengue en el sur del estado de Jalisco, México

Tesis (Maestría en Ciencias con Especialidad en Entomología Médica) UANL

Bionomía del vector de la malaria Anopheles vestitipennis Dyar & Knab (Díptera: Culicidae) en la cuenca del Río Polochic, Alta Verapaz, Guatemala, C.A. [por] Jaime Abraham Juárez Sandoval

Tesis (Maestría en Ciencias con Especialidad en Entomología Médica) U.A.N.L.

Evaluación en campo del depredador Mesocyclops longisetus (Thiebaud) (Copepoda: Cyclopoidea) para el control larval del vector del dengue Aedes aegypti (L.) en Monterrey, Nuevo León [por] Norma Gorrochotegui Escalante

Tesis (Maestría en Ciencias con Especialidad en Entomología Médica) U.A.N.L.

Construcción del vector adenoviral AD-UV2

Tesis (Maestría en Ciencias con Especialidad en Biología Molecular e Ingeniería Genética) UANL, 2011.

Generación del vector adenoviral oncolítico Ad5

Tesis (Maestría en Ciencias con Especialidad en Biología Molecular e Ingeniería Genética) UANL, 2011.

Generación de un vector adenoviral para la producción de anticuerpos policlonales contra la proteína ENV del XMRV (Xenotropic murine leukemia virus-related virus).

Tesis (Maestría en Ciencias con Orientación en Biología Molecular e Ingeniería Genética) UANL, 2011.

A composite discrete traction vector.

Tesis (Maestría en Ciencias con Orientación en Ingeniería Estructural) UANL, 2013.