Model savremenog sistema finansiranja na primeru islamskog bankarstva

nem

Removal of cationic pollutants from water by xanthated corn cob: optimization, kinetics, thermodynamics, and prediction of purification process

The removal of Cr(III) ions and methylene blue (MB) from aqueous solutions by xanthated corn cob (xCC) in batch conditions was investigated. The sorption capacity of xCC strongly depended of the pH, and increase when the pH rises. The kinetics was well fitted by pseudo-second order and Chrastil’s model. Sorption of Cr(III) ions and MB on xCC was rapid during the first 20 min of contact time and, thereafter, the biosorption rate decrease gradually until reaching equilibrium. The maximum sorption capacity of 17.13 and 83.89 mg g-1 for Cr(III) ions and MB, respectively was obtained at 40 °C, pH 5 and sorbent dose 4 g dm-3 for removal of Cr(III) ions and 1 g dm-3 for removal of MB. The prediction of purification process was successfully carried out and the verification of theoretically calculated amounts of sorbent was confirmed by using packed-bed column laboratory system with recirculation of the aqueous phase. The wastewater from chrome plating industry was successfully purified, i.e. after 40 min concentration of Cr(III) ions was decreased lower than 0.1 mg dm-3. Also, removal of MB from the river water was successfully carried out and after 40 min removal efficiency was about 94 %

Model ofšor bankarskog poslovanja u savremenim uslovima

nem

Pseudopacemaker syndrome and marked first-degree atrioventricular block: Case report

Introduction. Pacemaker syndrome consists of the symptoms and signs present in the single chamber (VVI) pacemaker patient with electrode placed in the right ventricular apex. It is caused by inadequate timing of atrial and ventricular contractions. Pacemaker syndrome without a pacemaker (or pseudopacemaker syndrome) refers to occurrence of symptoms in the presence of marked first-degree atrioventricular (AV) block, when P wave is too close to the preceding QRS complex producing the same haemodynamic disturbance as artificial pacemaker cardiac stimulation with retrograde VA conduction. Case Outline. We present the patient with acute inferior myocardial infarction due to late bare metal stent thrombosis, treated with primary pectutaneous coronary intervention. Hospital course was complicated by complete heart block which was treated with temporary pacing. During the stand-by mode of temporary pacing, sinus rhythm with marked first-degree AV block (PQ interval 480 ms) was observed while the patients re-experienced the symptoms that were present prior to pacemaker implantation. Temporary pacing was continued for the next 24 hours when spontaneous shorteninig of PQ interval (250-270 ms) was noticed; since the patient was asymptomatic during the stand-by mode, the pacemaker electrodes were removed and the patient discharged 11 days after admission. Conclusion. Conduction disturbances, such as the varying degrees of AV blocks, are relatively common in acute inferior myocardial infarction. The first degree AV blok is usually asymptomatic and does not require treatment, unless when it is associated with pseudopacemaker syndrome. In that case, temporary pacing provides haemodynamic stability until conduction system recovers

Preliminary geochemical investigation of karst barre from eastern Serbia Sokobanja basin

Karst bare is a hydrogeological phenomenon which denotes a karst terrain of limited area completely surrounded by rocks of low permeability, i.e. whose lower part is enclosed and bordered by more or less impervious rocks impeding ground water flowing out of the karst area. Sokobanja basin is one of the first localities where this kind of karst was detected. This study represents a preliminary geochemical analysis of karst bare samples from this locality. Atomic absorption spectrometric analysis shows that the studied samples are composed predominantly of Ca and contain minor amounts of Mg, probably in form of carbonate minerals obtained by dissolving with mineral acids. There are no detailed geochemical data about karst barre from this or any other locality in the available literature to date

Preliminary geochemical investigation of karst barre from eastern Serbia Sokobanja basin

Karst bare is a hydrogeological phenomenon which denotes a karst terrain of limited area completely surrounded by rocks of low permeability, i.e. whose lower part is enclosed and bordered by more or less impervious rocks impeding ground water flowing out of the karst area. Sokobanja basin is one of the first localities where this kind of karst was detected. This study represents a preliminary geochemical analysis of karst bare samples from this locality. Atomic absorption spectrometric analysis shows that the studied samples are composed predominantly of Ca and contain minor amounts of Mg, probably in form of carbonate minerals obtained by dissolving with mineral acids. There are no detailed geochemical data about karst barre from this or any other locality in the available literature to date

Ftir spectroscopic characterization of bituminous limestone: Maganik mountain (Montenegro)

FTIR spectroscopy has been used to detailed study of bituminous limestone samples from two different locations at Maganik Mountain (Montenegro). Bituminous limestone at Maganik Mountain occurs as carbonate sediments in three levels and belongs to the early Cretaceous. Our specimens come from the oldest sediments of this limestone belonging to Barremian age. Particular attention has been given to investigation of isolated asphaltenes and kerogens. The FTIR technique provides fine determination of various organic and inorganic functional groups, as well as aliphatic and aromatic carbon and hydrogen. Due to the structural complexity of kerogens and asphaltenes, in this study we have done correlations of particular infrared absorptions to various functional groups. The asphaltenes of studied samples show higher contribution of aromatic structures than the kerogens. Notable differences in FTIR spectra of some samples that are reflected as shift of peak locations and a variety of intensities are attributed to eventual differences in the microbial precursors and/or depositional environments, conditions of sedimentation and/or genesis

Characteristics of mineral, thermal and thermomineral waters of Carpatho-Balkanides Region (Eastern Serbia): The potentials and possibilities of their exploitation

Hydropower, biomass, biogas, biofuels, wind power, solar energy and geothermal energy are the major resources to provide the Republic of Serbia with most of renewable energy in the future. In this paper, the focus will be on renewable sources, specifically on thermomineral, thermal and mineral waters in the Carpatho-Balkanides Region (Eastern Serbia). The territory of Serbia is very rich in sources of mineral, thermal and thermomineral water. These numerous sources differ in their physico-chemical properties. Thus, they represent a very important natural resource with versatile possibilities for their usage. Region of Carpatho-Balkanides (Eastern Serbia) is highlighted in this regard. The distribution of mineral, thermal and thermo-mineral waters in this region is very significant, both by the number of known occurrences and deposits, as well as by the presence of certain types or classes and subclasses of water. This potential, at the same time, represents the basis for the development of various activities in the fields of medicine, tourism, sport and recreation, water bottling industry, as well as in processing of various mineral, agriculture etc. All these facts imply on the need for detailed and complex investigations in the field of hydrogeology of this natural wealth which offers, in economic terms, the great opportunities for the development and growth. However, the practice, on studied territory, showed neither proper understanding nor proper approach to the exploitation of this raw potential

Ftir spectroscopic characterization of bituminous limestone: Maganik mountain (Montenegro)

FTIR spectroscopy has been used to detailed study of bituminous limestone samples from two different locations at Maganik Mountain (Montenegro). Bituminous limestone at Maganik Mountain occurs as carbonate sediments in three levels and belongs to the early Cretaceous. Our specimens come from the oldest sediments of this limestone belonging to Barremian age. Particular attention has been given to investigation of isolated asphaltenes and kerogens. The FTIR technique provides fine determination of various organic and inorganic functional groups, as well as aliphatic and aromatic carbon and hydrogen. Due to the structural complexity of kerogens and asphaltenes, in this study we have done correlations of particular infrared absorptions to various functional groups. The asphaltenes of studied samples show higher contribution of aromatic structures than the kerogens. Notable differences in FTIR spectra of some samples that are reflected as shift of peak locations and a variety of intensities are attributed to eventual differences in the microbial precursors and/or depositional environments, conditions of sedimentation and/or genesis