results. When no antimony was present on the surface, bare activated carbon and the analyte ions stuck in the matrix pores. These pores also offered higher diffusion resistance compared to the outer surface and hence, the shoulder peak is observed compared to the AIAC. Furthermore, the increase in the area of this shoulder peak with higher amount of analytes can also be explained by similar arguments. Although relative interference of the ions was reported by various researchers [ 36 ], but in most of the previous studies electrodes were calibrated by using one type of
, with negligible contribution from the B 2p states. Following the above arguments we may predict that the appearance of superconductivity in Fe x B under pressure is similar to the case of iron that undergoes a transition to superconducting phase above 30 GPa when it loses its magnetic moment [ 31 ]. It is easy to observe that the magnetic moment decreases with increasing pressure. 4 Elastic properties under pressure It is well known that elastic properties reflect interatomic interactions and are related to some fundamental physical properties, such as thermal
parameter plot ( Fig. 2a ), where the dependence flattens out for x = 0.3 and 0.4 proving that no more material is incorporated into the lattice. The last sample with Ni content x = 0.5 regains the trend but with a smaller slope which can be again explained by the appearance of the second phase. The restoration of the structural quality for x = 0.5 can be explained on the basis of the argument given already by Branford et al. [ 52 ]. The authors in question noted that the cation structural unit ( Fig. 8 therein) was built of 4 cations which stabilized the configurations
This paper examines the need for a Public Procurement Maturity Model (PPMM) in organizations with the role of road infrastructure buyers under public procurement legislation in a monopsony market structure. The environment used to contextualize the information is Romania and CNADNR (Compania Națională de Autostrăzi și Drumuri Naționale din România).
The literature research, open data as well as my own practical experience are used as entry data for the four parts of the paper: (i) the context leading to the PPMM need identification, (ii) an overview of the existing public (procurement) maturity models; (iii) discussions and (iv) summary, limitations, and outlook.
The paper provides arguments of an upstream intervention in the value chain of road transport infrastructure and highlights the benefits of such an intervention. Elements such as Romanian cultural dimensions, type of market structure or impact of the outcomes of public procurement process for road infrastructure are considered relevant entry data for an intervention which aims to contribute to the improvement of performance at a procurement process level.
The results of this paper serve as a starting point for further reflection on the performance in road infrastructure public procurement area in Romania. In addition to the awareness of the need for an intervention at a contracting authority level, the paper arguments that market structure or national cultural dimensions must be considered as entry data in designing maturity models.
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