Tailored Formulation of Capillary Suspensions as Precursor for Porous Sintered Materials

Makroporöse Sintermaterialien haben eine große technische Bedeutung als Werkstoffe für Filtrationsmembranen, Katalysatorträger, Implantate oder in Leichtbauanwendungen. Der Schwerpunkt dieser experimentellen Dissertation liegt auf der maßgeschneiderten Formulierung von Kapillarsuspensionen zur Herstellung von Produkten mit besonderen Materialeigenschaften. Kapillarsuspensionen wurden so unter anderem eingesetzt um hochporöse Glasfilter mit großer Permeabilität und 3D-gedruckte zelluläre Leichtbaustrukturen mit hoher spezifischer Festigkeit herzustellen

Genetic drift: a stochastic process

Call number: LD2668 .R4 1967 M38

Plan de mejora de la calidad de los servicios de los locales gastronómicos de Ballenita, provincia de Santa Elena

Ballenita es un pequeño puerto de pescadores, situada a poca distancia de Libertad, esta playa se encuentra ubicada a 20 minutos de Salinas, algunas personas se dedican a la pesca artesanal otras a las actividades relacionadas al turismo. El proyecto de titulación tiene como finalidad mejorar la calidad de los servicios de los locales gastronómicos de Ballenita mediante revisión documental se conoció sobre las teorías, conceptos y leyes que avalan esta investigación, y con el trabajo de campo que implicó encuestas a los comensales de estos locales, y entrevistas con autoridades de la ciudad y el presidente de la asociación de los locales gastronómicos del lugar. Para analizar esta información se utilizaron los métodos cuantitativos y cualitativos, se obtuvo resultados acerca de las debilidades de los locales, con lo que se propone el proyecto, pues al haber visto el trato, el servicio, la atención al cliente se llegó a la conclusión que se podría mejorar la calidad de los servicios de los locales gastronómicos a través de charlas de capacitación para mejorar su conocimiento sobre el servicio, la calidad, tener buen manejo con el cliente, y la manipulación de alimentos, etc. Creando la propuesta con un cronograma de actividades a realizarse en los locales gastronómicos de Ballenita para que mejore la calidad y atención al cliente sobre el servicio que ofrecen y el uso de los alimentos, que es lo que se propone en este trabajo, además como estrategia de mercadeo y promoción, realizar una feria en el que se premie la elaboración de un plato innovador y la venta de esos platos permita el crecimiento de estos negocios e incentive el turismo de Ballenita.Ballenita is a small fishing port, located a short distance from Libertad, this beach is located 20 minutes from Salinas, some people are engaged in artisanal fishing and other activities related to tourism. The purpose of the titling project is to improve the quality of Ballenita's gastronomic restaurant services through a documentary review about the theories, concepts and laws that support this research, and with the fieldwork that involved surveys of the diners of these local, and interviews with city author ities and the president of the association of local gastronomic venues. To analyze this information, quantitative and qualitative methods were used, results were obtained about the weaknesses of the premises, with which the project is proposed, since having seen the treatment, the service, the attention to the client, it was concluded that the quality of the services of the gastronomic establishments could be improved through training talks to improve their knowledge about service, quality, good management with the client, and food handling, etc. Creating the proposal with a schedule of activities to be carried out in Ballenita's gastronomic premises so that it improves quality and customer service on the service they offer and the use of food, which is what is proposed in this work, as well as strategy of marketing and promotion, holding a fair in which the preparation of an innovative dish is rewarded and the sale of these dishes allows the growth of these businesses and encourages Ballenita tourism

Advanced design and characterization methodologies for memory-aware CMOS power-amplifier implementation

This paper reports on an effective root-cause analysis method of memory effects in power amplifiers, as well as introduces compensation techniques on a circuit design level. Despite conventional memory-effect approaches, the discussed method uses a two-tone scan over a wide operation and modulation range. This enables an in-depth study of physical causes and helps to implement compensation techniques at design stage. On the one hand, this circuit investigation is optimized using an automated SystemC model parametrized with real device and measurement values. Hence, computation time is widely reduced which shortens design cycles. On the other hand, the implementation of the derived circuit compensation means will reduce the complexity of digital pre-distortion due to a reduced memory-effect induced AM/AM and AM/PM hysteresis. The approach is demonstrated on a 65 nm CMOS power amplifier with an OIP1 of 27 dBm and a PAE of over 30 % using WCDMA and LTE signals. In fact, mismatch could be reduced by more than 8 %

Maize rough dwarf virus – for the first time detected in Germany

Im Jahre 2006 wurde erstmals in Deutschland das Maize rough dwarf virus anhand der Blattenationen an befallenen Pflanzen sowie elektronenoptischer Analyse nachgewiesen. In vier Maisfeldern in der Nähe von Breisach im Schwarzwald waren bis zu 50 % der Pflanzen von diesem Virus befallen. Auf eine möglicherweise zunehmende Bedeutung des Virus in Deutschland ist hingewiesen worden.In 2006 leaf enation symptoms were found on maize plants in Black Forest area in Southern Germany. Electron microscopic examination verified Maize rough dwarf virus in symptomatic plants. This is the first report of this virus in Germany. The virus was found in four fields with almost 50 % of maize plants infected. This provides an indication for an increasing agronomical significance of this virus in Germany

Comparación de la cirugía de Mohs vs radioterapia superficial como tratamiento del cancer de piel.

Introduction: This review article compares Mohs surgery and superficial radiotherapy, specifically image-guided superficial radiotherapy (IGSRT), as treatments for non-melanoma skin cancer. Both methods are prominent in managing basal and squamous cell carcinomas, which are prevalent in regions with high ultraviolet radiation exposure. While Mohs surgery is distinguished by its precision and ability to conserve tissue, IGSRT presents itself as a non-invasive alternative with a favorable safety profile. Objective: To compare the efficacy, safety, recurrence, and aesthetic outcomes of Mohs surgery and superficial radiotherapy, specifically image-guided superficial radiotherapy (IGSRT), in the treatment of non-melanoma skin cancer. Methodology: A systematic search was conducted according to the PRISMA model, analyzing studies published between 2020 and 2024 in databases such as PubMed, Scopus, and Cochrane. Out of 380 initial records, 16 studies were selected for thorough analysis. Results: The findings indicate that Mohs surgery offers high cure rates, over 95% for first-time treated cases, but also involves limitations, such as the need for specialized infrastructure. On the other hand, IGSRT showed comparable local control rates, with 99.3% short-term stability, and fewer complications. Conclusion: Both modalities are effective for treating non-melanoma skin cancer, offering different benefits depending on patient needs. The choice between them should be based on the patient's profile and resource availability.Introducción: Este artículo de revisión compara la cirugía de Mohs y la radioterapia superficial, específicamente la guiada por imágenes (IGSRT), como tratamientos para el cáncer de piel no melanoma. Ambos métodos son prominentes en el manejo de carcinomas de células basales y escamosas, que son prevalentes en regiones con alta exposición a la radiación ultravioleta. Mientras la cirugía de Mohs se distingue por su precisión y capacidad para conservar tejido, IGSRT se presenta como una alternativa no invasiva con favorable perfil de seguridad. Objetivo: Comparar la eficacia, seguridad, recurrencia, y resultados estéticos de la cirugía de Mohs y la radioterapia superficial, específicamente radioterapia superficial guiada por imágenes (IGSRT), en el tratamiento del cáncer de piel no melanoma. Metodología:  Se llevó a cabo una búsqueda sistemática según el modelo PRISMA, analizando estudios publicados entre 2020 y 2024 en bases de datos como Pubmed, Scopus, Cochrane. De 380 registros iniciales, se seleccionaron 16 estudios para un análisis exhaustivo. Resultadios: Los resultados indican que la cirugía de Mohs ofrece altas tasas de curación, superiores al 95% para casos tratados por primera vez, pero también conlleva limitaciones, como la necesidad de infraestructura especializada. Por otro lado, la IGSRT mostró tasas de control local comparables, con un 99.3% de estabilidad a corto plazo, y menos complicaciones. Conclusión: Ambas modalidades son efectivas para tratar cáncer de piel no melanoma, ofreciendo diferentes beneficios según las necesidades del paciente. La elección entre ellas debe basarse en el perfil del paciente y la disponibilidad de recursos

The effect of hot isostatic pressing on surface integrity, microstructure and strength of hybrid metal injection moulding and laser-based powder bed fusion stainless-steel components

Hybrid manufacture of components by combining capabilities of replication and additive manufacturing processes offer a flexible and sustainable route for producing cost-effectively small batches of metal parts. At present, there are open issues related to surface integrity and performance of such parts, especially when utilising them in safety critical applications. The research presented in this paper investigates the ductility amplification of hybrid components produced using metal injection moulding to preform and then build on them customisable sections by laser-based powder bed fusion. The properties of such hybrid components are studied and optimised through the use of non-conventional post treatment techniques. In particular, hot isostatic pressing (HIP) is employed to improve mechanical strength and to produce hybrid components that have consistent properties across batches and throughout the samples, minimising microstructural heterogeneities between fabrication processes. Thus, the investigated post-processing method can offer an extended service life of hybrid components, especially when operating under severe conditions. The optimised post treatment was found to increase the hybrid components’ strength compared to as-built ones by 68% and ~11% in yield strength (YS) and ultimate tensile strength (UTS), respectively. Subsequently, leading to a great pitting resistance, thus, making HIP samples suitable for corrosive environments. The advantages of the HIP treatments in comparison to the conventional heat treatment of hybrid components are discussed and also some potential application areas are proposed