http://repositorio.lnec.pt:8080/jspui/handle/123456789/222 2026-04-05T02:14:14Z 2026-04-05T02:14:14Z Pereira, C. http://repositorio.lnec.pt:8080/jspui/handle/123456789/1017636 2024-10-07T15:28:29Z 2016-01-01T00:00:00Z

Implementation of subloading constitutive models in Material Point Methods Pereira, C. This document describes the work developed in the short term scientific mission, STSM, of the COST TU1202, entitled Implementation of subloading constitutive models in material point methods, hosted by Dr. Phil Vardon, in the Technical University of Delft, TU Delft. A dynamic version of the material point method, MPM, in two-dimension was programmed, with the computer language Fortran. An elastoplastic subloading soil model with anisotropy, cyclic behaviour and structure was implemented in the program. The constitutive model was integrated using an explicit algorithm.

2016-01-01T00:00:00Z Carvalho, M. R. http://repositorio.lnec.pt:8080/jspui/handle/123456789/1016706 2023-11-21T11:03:19Z 1998-01-01T00:00:00Z

Análise distorcional de solos aluvionares lodosos Carvalho, M. R.

1998-01-01T00:00:00Z Melo, F. http://repositorio.lnec.pt:8080/jspui/handle/123456789/1014530 2022-04-08T08:06:14Z 1974-12-01T00:00:00Z

Colaboração no controle do aterro da barragem do Salgueiro Melo, F.

1974-12-01T00:00:00Z Aljundi, K. Vieira, A. http://repositorio.lnec.pt:8080/jspui/handle/123456789/1011374 2019-03-08T15:19:37Z 2019-01-01T00:00:00Z

Thermal conductivity of sand under transient conditions - TPSYS02 Thermal Measurement System Aljundi, K.; Vieira, A. The growing concerns about the climate change and the negative environmental impacts of heating and cooling systems operated by fossil fuels, have led the technical and the scientific communities to find out more environmentally and sustainable energy alternatives, such is the case of shallow geothermal sources. Shallow geothermal systems use the ground as a heat reservoir, transferring thermal energy from the ground to a building, or vice-versa, with the help of a heat pump, to provide warmth in winter and cooling in summer. A proper evaluation of the thermal properties of the soil is essential in their design process and for a sustainable system. Thermal conductivity is the most important parameter for this evaluation. Thermal conductivity can be estimated or measured by several methods, namely by means of empirical correlations, and experimentally, either in situ, by means of the well-known Thermal Response Tests (TRT), or in the laboratory, under steady state or transient conditions. This work presents a series of thermal conductivity measurements on dry sand samples obtained by means of a high accuracy system with reference TPSYS02 Hukseflux equipped with Non-Steady-State Probes (NSSP) (TP02 or TP08). The system was acquired in the aim of an FCT research project. The work includes the completion of a guide to procedures to the use of the thermal measurement system. Details of its calibration as well as results from tests in soil samples are also presented.

2019-01-01T00:00:00Z