Post-socialist urban growth of Bucharest, Romania – a change detection analysis on Landsat imagery (1984–2010)

In this study, Bucharest, the capital city of Romania was selected as a case study. Based on time series of Landsat TM imagery and statistical data, an analysis on urban growth from 1984 to 2010 was performed, using an integrated approach of remote sensing and GIS techniques. The land cover data were validated by CORINE Land Cover maps. The results revealed that rapid urban growth of the Bucharest region led to accelerated land use conversion from cropland to built-up land. The processes of deindustrialization in the core city and industrialization to the ring road represent other driving factors for spatiotemporal pattern of built-up land. The paper will discuss these processes and their impact on economic growth and residential suburbanization of the studied region

Ensayo de Carga Cíclica de un Muro a Escala Natural con Ladrillo Blocker II – Espécimen MBAT-06

La presente tesis de investigación denominada: “Ensayo de carga cíclica de un muro a escala natural con ladrillo blocker II – espécimen MBAT-06”; tiene como objetivo obtener mediante ensayos experimentales, el valor de la deriva máxima de un muro de albañilería confinada sometiéndolo a una carga lateral cíclica y carga vertical de 10Tn, lo que significa hasta qué punto el muro ensayado debe quedar en estado reparable, así como también determinaremos la curva de capacidad del espécimen, la relación de rigidez equivalente y la distorsión máxima alcanzada en cada ciclo histerético, comparando los resultados obtenidos de los ensayos experimentales con la Norma Técnica Peruana E.030 del Reglamento Nacional de Edificaciones. Para dicho estudio se empleará una metodología mediante ensayos realizados en el Laboratorio de Estructuras del CISMID de la Universidad Nacional de Ingeniería. Para realizar este trabajo de tesis, se tuvo que construir un muro de albañilería confinada construido con la unidad hueca en escala natural; terminados los ensayos se concluye en los resultados del ensayo que un muro construido con blocker II con mortero 1:4 y carga vertical de 10tn, tiene un límite de reparabilidad de 0.0018.Tesi

INNOVATIVE SOLUTIONS FOR THE PRODUCTION OF BRICKS FROM WASTEWATER TREATMENT SLUDGE

Based on the need to recover various wastes such as waste from wastewater treatment plants, it is proposed to use sludge in the manufacture of various building materials as bricks. So far, bricks made of different materials and combinations of classical materials as burnt clay, cement, sand, but also of other unconventional materials, most of them coming from different wastes, are used in construction. In order to use the sludge for bricks fabrication, it is necessary to inert it and to obtain a moisture content below 80%. Also, the physico-chemical and ecological parameters must be suitable for sludge utilization and their values must be situated within the limits imposed by legislation. So, the sludge is centrifuged in order to reduce the moisture content from (90-95)% to a maximum of 80%, treated, then the sludge batches are characterised and finally the sludge is recovered by inert cement

FORAGE MIXTURES WITH ALFALFA CULTIVARS, PERENNIAL GRASSES AND ANETHUM GRAVEOLENS

Fodder crops consisting of several species are a way to obtain very good quality feed. They have been used more and more recently in Europe because, in addition to the superiority of feed production and quality, sowing mixtures of several species can lead to a significant reduction in the need for nitrogen fertilizer, an increase in performance and animal health. In Romania, there are few studies on the use of multi-species feed mixtures to reduce dependence on expensive inputs in order to increase the profitability and quality of feed, in organic agriculture production system. The objective was to compare forage yield, degree of coverage and weed infestation of alfalfa single crop and perennial grasses mixtures, which include 10 synthetic alfalfa cultivars and 5 varieties, grasses (a cultivar of Dactylis glomerata, Festuca arundinacea, Phleum pratense), mixed with herb Anethum graveolens. A field experiment was established in 2022 in the experimental field of the Center for Organic Agriculture at NARDI Fundulea. The results showed that mixtures of alfalfa with dill and festuca had a higher yield than alfalfa in pure crop. Anethum graveolens seeded with forage mixtures proved the efficacy as a natural repellent of Hypera variabilis in the first year of crop. In general, alfalfa-grass mixtures had beside higher feed yields and lower weed and pests infestations than alfalfa monocultures or mixtures of two species

Indoor radon related with the geology in romanian urban agglomerations (cluj-napoca)

Radon is a natural radioactive gas that occurs due to the radioactive decay of radium (226Ra) present in rocks which, in turn, cames from the radioactive decay of uranium (238U), a primordial natural element. Along with factors such as porosity, permeability and humidity of the rocks and soils, pressure and temperature, geology setting plays one of the most important roles in the release of radon into the environment. Depending on the mineralogical compositions and characteristics of the bedrock from a certain area, a higher or lower concentration of radioactive minerals can be found in the rocks, which will directly influence the level of radon in the atmosphere, implicitly the concentration of radon measured in houses. In this study, a six months concentration of radon (222Rn) was assessed in 256houses from Cluj-Napoca area using CR-39 nuclear track detectors. Correlations between the indoor radon levels and the geological setting was further analyzed. The aim is to better understand the influence of geology on the concentration of radon levels in homes, in order to further identify other risk areas in terms of exposure to radon. Further investigation is needed on other factors influencing the accumulation of radon in high concentrations indoor, such as ventilation, occupation patterns or constructive and architectural features for typical houses. Therefore, the results of this work are considered to be important for indoor radon management in Romania

Multistrip multigap symmetric RPC

Abstract The characteristics of a symmetric multigap resistive plate chamber with multistrip readout electrode, recently developed by us, continued to be investigated. Studies of the time resolution, efficiency, average charge and dark rate as a function of applied voltage and the influence of the angle of incidence of the detected particle on these observables have been performed. Different type of discriminators have been tested