Deposition temperature is one of the significant technological parameters determining the film structure. Hence, in this paper, the piezoresistive sensitivity of heavily doped PSNFs with different deposition temperatures was firstly investigated. By calculating the tunneling current and the stress-induced changes in the effective mass and the concentration of heavy and light holes, the numerical relationship between the PRCs of GBs and grain neutral regions was obtained. Then the tunneling piezoresistive model of PSNFs was established preliminarily. Because the influences of deposition temperature and heat treatment on film microstructure are quite complicated, the dependence of GF on deposition temperature was analyzed qualitatively based on the obtained theoretical results. On the other hand, for the applications of sensing devices, the reliability and stability of PSNF material are of particular importance. The PRL and RTD of PNSF piezoresistors are two significant parameters characterizing the reliability and stability. Thus, the dependences of PRL and RTD on deposition temperature were given and studied. And the IV model was established to describe GBs and analyze PRL and RTD qualitatively. Also, the influence of residual H atoms in polysilicon was taken into account for RTD.2.?Experimental Details2.1. Film prepa
Accurate surveying of cave passages, chambers and the shape of their walls has always been a priority issue before attempting to describe or understand processes takes place underground, whether they are related to the origin and formation of the caves, or to the human activities that may have occurred in them. The new computerized digital techniques provide tools that increase notably the efficiency and the accuracy of the surveys and provide the basic grounds for any further research. In this work we present the integrated use of non invasive techniques to document two of the most significant Paleolithic caves in northern Spain, especially focused on prehistoric wall paintings and engravings.The Spanish Cantabrian Mountains together with Southwestern France and the Pyrenees concentrate around 95% of all known Paleolithic settlements in Europe. The uncontrolled increase of visitors, as well as the natural damage caused by time, has negatively affected these extremely delicate art forms. Classic cave surveying has been always performed through compass and tape techniques, and in very rare cases precise surveying instruments have been used in the survey of large portion of caves. In addition, the aforementioned techniques do not provide an accurate 3D representation of the underground passages and chambers. toward Therefore, it is essential to integrate the new available technologies and methodologies in order to allow its preservation and to provide scientists with an accurate, non invasive, surveying tool that efficiently enables the 3D reconstruction of this Cultural Heritage wealth.