A novel macroporous polymer-inorganic nanocomposite as a sorbent for pertechnetate ions

A novel magnetic macroporous poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) (mPGME) was prepared by suspension copolymerization and functionalized with diethylenetriamine (mPGME-deta). The samples were characterized by Fourier transform infrared spectroscopy (FTIR) analysis, mercury porosimetry, scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), atomic force microscopy (AFM) and SQUID magnetometry. The sorption behavior of mPGME-deta toward pertechnetate ions (TcO4-) from aqueous solution was studied. Experimental results indicated relatively fast TcO4- sorption kinetics that depends on pH and ionic strength, with a high removal efficiency of 99% within 180 min in the pH range 3.0-5.0. The pseudo-second-order model yielded the best fit for the kinetic data

Compliance of Serbian Railways Regulations for Performance of Duties in Public Transportation with European Union Regulations

Duties of the public passenger transport are still present on the railways, although the railway had long lost its monopoly on the transport market, and their presence made it difficult for beginning the process of reform, transition and restructuring of railways in relation to other modes of transport. Those instrument has been replaced by the establishment of a new way of financing unprofitable transport through the introduction of the obligation of public transport including rail transporter obligation to transport passengers and goods at established prices and special conditions for a fee determined by the difference between the cost of the state and justified the full cost. Baseline this instrument gives its effect on the economy of business traffic (transporters). Losses in business could be compensated from the state budget, but budget was insufficient and it was impeded the orderly and proper maintenance of infrastructure. In such circumstances the exploitation parameters infrastructure are exacerbated, and that effects led to the further weakening the competitive position of the railway. So, in a situation where the state compensates the losses from operations of railways it also provides funds for simple reproduction of the infrastructure, so that the final result of the railroad and shall bear is the total amount of these costs. However, the causal circuit costs, prices, competition, transport volume, revenue, profit ,quality maintenance, a new reduction of competitiveness, are really important deteriorating market position of the railways