The sustainability of start-up firms among formerly wage workers

In this paper we analyse the survival of start-up firms among formerly wage workers in Spain. In particular, we address the question of how long do these workers remain self-employed before entering into unemployment or returning to a new paid-employment, using well-known duration model techniques. Results show that a higher survival rate in self-employment is associated to men, prime-age workers and individuals with higher previous labour turnover. Moreover, longer unemployment spells are found to speed up the rate of transition to non-employment and to reduce that to paid employment. Finally, the probability of exiting decreases with duration in self-employment

Puntos de corte para el acoso psicológico en el trabajo: el cuestionario breve de actos negativos (S-NAQ) en español

Antecedentes: el acoso psicológico en el trabajo es un estresor laboral severo de origen social. Sin embargo, en el contexto español, hay escasez de medidas que nos permitan diagnosticar de forma fiable si una persona está siendo objeto de acoso. Método: se informa de las propiedades psicométricas, la estructura factorial y los puntos de corte del Cuestionario Breve de Actos Negativos (S-NAQ) en una muestra española (N = 1.409). Resultados: el S-NAQ presenta unas buenas propiedades psicométricas. Los análisis factoriales exploratorios y confirmatorios revelan que la escala tiene una única dimensión. Los datos de las curvas ROC indican dos puntos de corte que nos permiten categorizar a las personas como “no expuestas a conductas de acoso” (puntuaciones menores de 15), “en riesgo de ser acosadas” (puntuaciones entre 15 y 22), o “víctimas de acoso” (puntuaciones mayores de 22). Conclusiones: estos puntos de corte pueden facilitar el diagnóstico de acoso y servir para diseñar intervenciones según cada categoría.Background: Workplace bullying is considered a major social stressor at work. However, in the Spanish context, there is a lack of measures that allow researchers and practitioners to distinguish between non-targets and targets of workplace bullying. Method: This study reports the psychometric properties, factor structure, and cutoff scores for the Short-Negative Acts Questionnaire (S-NAQ) in a Spanish sample (N = 1,409). Results: The S-NAQ demonstrated adequate psychometric properties. Moreover, both Exploratory and Confi rmatory Factor Analysis revealed that a unifactorial model of workplace bullying fi t the data best. Two cutoff points for the S-NAQ were formulated using receiver operating characteristic curves to categorize respondents as “not exposed to workplace bullying” (scores below 15), “at risk of being bullied” (scores between 15 and 22), and “targets of workplace bullying” (scores above 22). Conclusions: These cutoff scores may help researchers and practitioners in diagnosing workplace bullying and designing intervention strategies.Ministerio de Ciencia e Innovación PSI2017-83465-

Incremento de la producción maderera en un contexto de despoblación rural

Comunicación presentada no Congreso Técnico-Científico sobre Desagrarización e Sostibilidade Rural na Euro-Rexión Galicia- Norte de Portugal. Lugo, 27, 28 e 29 de setembro 2006Se presentan las actuaciones planificadas en un monte vecinal para incrementar su producción maderable. Diversos condicionantes limitan las posibles intervenciones: el carácter colectivo de la propiedad, un entorno rural fuertemente desertizado, la baja aptitud del medio para la producción maderera, el importante esfuerzo inversor inicial para repoblar extensas áreas rasas o la incertidumbre acerca del éxito de las inversiones dado el alto riesgo de incendio. Asumiendo esto se propone dividir el monte en dos cuarteles productores de madera de pino de calidad, dejando parte del monte con uso protector. La repoblación de rasos será escalonada para evitar una inversión inicial elevada e inviable. Asimismo, la repoblación por etapas permitirá lograr a largo plazo un predio donde coexistan masas de todas las edades del ciclo productivo, lo que contribuirá a regularizar la magnitud y periodicidad de las cortas, con la consiguiente percepción de rentas de forma continuada en el tiempo

Validation of smart nanoparticles as controlled drug delivery systems: loading and pH-dependent release of pilocarpine

Micelles are good devices for use as controlled drug delivery systems because they exhibit the ability to protect the encapsulated substance from the routes of degradation until they reach the site of action. The present work assesses loading kinetics of a hydrophobic drug, pilocarpine, in polymeric micellar nanoparticles (NPs) and its pH-dependent release in hydrophilic environments. The trigger pH stimulus, pH 5.5, was the value encountered in damaged tissues in solid tumors. The new nanoparticles were prepared from an amphiphilic block copolymer, [(HEMA19%-DMA31%)-(FMA5%-DEA45%)]. For the present research, three systems were validated, two of them with cross-linked cores and the other without chemical stabilization. A comparison of their loading kinetics and release profiles is discussed, with the support of additional data obtained by scanning electron microscopy and dynamic light scattering. The drug was loaded into the NPs within the first minutes; the load was dependent on the degree of cross-linking. All of the systems experienced a boost in drug release at acidic pH, ranging from 50 to 80% within the first 48 h. NPs with the highest degree (20%) of core cross-linking delivered the highest percentage of drug at fixed times. The studied systems exhibited fine-tuned sustained release features, which may provide a continuous delivery of the drug at specific acidic locations, thereby diminishing side effects and increasing therapeutic rates. Hence, the studied NPs proved to behave as smart controlled drug delivery systems capable of responding to changes in pH.Peer ReviewedPostprint (published version

Convolutional Goppa Codes

We define Convolutional Goppa Codes over algebraic curves and construct their corresponding dual codes. Examples over the projective line and over elliptic curves are described, obtaining in particular some Maximum-Distance Separable (MDS) convolutional codes.Comment: 8 pages, submitted to IEEE Trans. Inform. Theor

Communication tree problems

In this paper, we consider random communication requirements and several cost measures for a particular model of tree routing on a complete network. First we show that a random tree does not give any approximation. Then give approximation algorithms for the case for two random models of requirements.Postprint (published version

El trabajo colaborativo entre distintas materias de grado

Coordinating the subject matter of different university modules plays a key role in the provision of good teaching performance. In order to achieve high quality teaching standards, university lecturers should cross-examine and jointly design their programmes. They need to coordinate their assigned teaching content with colleagues of their own department as well as with members of other faculties and university units. Cooperation is achieved by working together towards a commonly defined educational project, by sharing values, ground rules, guidelines and principles based on attitudes commonly agreed on such as responsible collaboration, the search for permanent renewal, mutual help and respect, engaged participation, individual and group thinking, and seeking to improve teaching and research outcomes. These factors help create an environment conducive to further the motivation of the students and to make a positive impact both on their learning and on our teaching.La coordinación de asignaturas supone un importante papel en el desarrollo de una docencia de calidad. Una de las exigencias para obtener una docencia de calidad es la coordinación del docente universitario. El docente universitario tiene que coordinarse con su grupo departamental o interdepartamental y a nivel de Facultad, Centro o Intercentros. Esta coordinación se consigue, entre otras, trabajando en común; compartiendo valores, normas, orientaciones y principios tales como: colaboración, responsabilidad, innovación, ayuda, respeto mutuo, participación, reflexión individual y colectiva, mejora de calidad docente e investigadora. Todo esto aporta un clima motivador e integrador que influye positivamente en la formación del alumnado y en su proceso de enseñanza-aprendizaje

De las rentas mínimas a la renta básica de las iguales y mucho más

El presente artículo describe la Renta Básica de las Iguales y la contrapone a las rentas mínimas, incluyendo una descripción de la renta garantizada de ciudadanía del País Valencià. La Renta Básica de las Iguales es una herramienta de transformación social vinculada a una intervención social emancipadoraThe present article describes Citizens' Basic Income, and sets this in contrast to minimum incomes, including a description of the guaranteed citizenship income of the País Valencià. Citizens' Basic Income is a tool for social transformation linked to emancipating social intervention