Recent demographic-economic processes in the Belgrade agglomeration

U radu se istražuju osnovne karakteristike demografskih i ekonomskih promena na prostoru beogradske aglomeracije u drugoj polovini 20. veka i ukazuje na globalni trend njihovih uslovljenosti i kretanja. Promene u teritorijalnom razmeštaju, prostornom pomeranju i strukturnim odlikama stanovništva unutar same aglomeracije bile su u bliskoj interakciji sa razvojnim tokovima i širenjem urbanog regiona. Razvoj beogradske aglomeracije prati više faza u njenom fizionomsko-prostornom, ekonomskom i demografskom narastanju, pri čemu su migracije, kao u slučaju svih velikih urbanih sistema, odigrale poseban uticaj na rast i strukturne odlike stanovništva. U radu je poseban akcenat dat savremenim razvojnim procesima i njihovim efektima na demografski razvitak.In this paper, basic characteristics of demographic and economic changes in the area of Belgrade agglomeration in the second half of 20th century has been researched, and a global trend of their establishments and motions has been indicated. Changes of territorial arrangement, spatial distribution and structural features of population, within the agglomeration itself, were in close interaction with directions of development and expansion of urban region. Belgrade agglomeration development follows several stages in its physiognomic-spatial, economic and demographic growth, whereby the migrations, as in cases of all large urban systems, had special influence on growth and structural features of population. In this paper, modern development processes and their effects on demographic growth have been emphasized

Regional inequality in Serbia as a development problem

The aim of this paper, in the context of the contemporary socio-economic changes in Serbia, is to consider changes in the regional development policy, and therefore in the approach to underdeveloped areas. A special attention is paid to regional inequality as a developmental problem since it directly influences the integrative processes, violating them, and therefore leads to side effects (economic, social, demographic, ecological, spatial, etc.). In Serbia, traditionally undeveloped areas (rural, hilly-mountainous and border/peripheral) have formed during a longer historical period, contrary to the new types of areas - municipalities (“devastated areas”) that are connected to the transition period (“transition poverty”). Both appeared by cause and effect reaction to natural, socio-economic, social, demographic, cultural-civilizational and political factors

Savremeni demografsko-ekonomski procesi u prostoru beogradske aglomeracije

In this paper, basic characteristics of demographic and economic changes in the area of Belgrade agglomeration in the second half of 20th century has been researched, and a global trend of their establishments and motions has been indicated. Changes of territorial arrangement, spatial distribution and structural features of population, within the agglomeration itself, were in close interaction with directions of development and expansion of urban region. Belgrade agglomeration development follows several stages in its physiognomic-spatial, economic and demographic growth, whereby the migrations, as in cases of all large urban systems, had special influence on growth and structural features of population. In this paper, modern development processes and their effects on demographic growth have been emphasized.U radu se istražuju osnovne karakteristike demografskih i ekonomskih promena na prostoru beogradske aglomeracije u drugoj polovini 20. veka i ukazuje na globalni trend njihovih uslovljenosti i kretanja. Promene u teritorijalnom razmeštaju, prostornom pomeranju i strukturnim odlikama stanovništva unutar same aglomeracije bile su u bliskoj interakciji sa razvojnim tokovima i širenjem urbanog regiona. Razvoj beogradske aglomeracije prati više faza u njenom fizionomsko-prostornom, ekonomskom i demografskom narastanju, pri čemu su migracije, kao u slučaju svih velikih urbanih sistema, odigrale poseban uticaj na rast i strukturne odlike stanovništva. U radu je poseban akcenat dat savremenim razvojnim procesima i njihovim efektima na demografski razvitak

Savremeni demografsko-ekonomski procesi u prostoru beogradske aglomeracije

In this paper, basic characteristics of demographic and economic changes in the area of Belgrade agglomeration in the second half of 20th century has been researched, and a global trend of their establishments and motions has been indicated. Changes of territorial arrangement, spatial distribution and structural features of population, within the agglomeration itself, were in close interaction with directions of development and expansion of urban region. Belgrade agglomeration development follows several stages in its physiognomic-spatial, economic and demographic growth, whereby the migrations, as in cases of all large urban systems, had special influence on growth and structural features of population. In this paper, modern development processes and their effects on demographic growth have been emphasized.U radu se istražuju osnovne karakteristike demografskih i ekonomskih promena na prostoru beogradske aglomeracije u drugoj polovini 20. veka i ukazuje na globalni trend njihovih uslovljenosti i kretanja. Promene u teritorijalnom razmeštaju, prostornom pomeranju i strukturnim odlikama stanovništva unutar same aglomeracije bile su u bliskoj interakciji sa razvojnim tokovima i širenjem urbanog regiona. Razvoj beogradske aglomeracije prati više faza u njenom fizionomsko-prostornom, ekonomskom i demografskom narastanju, pri čemu su migracije, kao u slučaju svih velikih urbanih sistema, odigrale poseban uticaj na rast i strukturne odlike stanovništva. U radu je poseban akcenat dat savremenim razvojnim procesima i njihovim efektima na demografski razvitak

PREVENTION AND CONTROL OF DIMETHYLAMINE VAPORS EMISSION: HERBICIDE PRODUCTION PLANT

The widely used herbicide, dimethylamine salt of 2,4-dichlorophenoxy acetic acid (2,4-D-DMA), is usually prepared by mixing a dimethylamine (DMA) aqueous solution with a solid 2,4-dichlorophenoxy acetic acid (2,4-D). The vapors of the both, reactants and products, are potentially hazardous for the environment. The contribution of DMA vapors in overall pollution from this process is most significant, concerning vapor pressures data of these pollutants. Therefore, the control of the air pollution in the manufacture and handling of methylamines is very important. Within this paper, the optimal air pollution control system in preparation of 2,4-D-DMA was developed for the pesticides manufacturing industry. This study employed the simple pollution prevention concept to reduce the emission of DMA vapors at the source. The investigations were performed on the pilot plant scale. To reduce the emission of DMA vapors, the effluent gases from the herbicide preparation zone were passed through the packed bed scrubber (water - scrubbing medium), and the catalytic reactor in sequence. The end result is a substantially improved air quality in the working area, as well as in the urbanized areas located near the chemical plant

Silaže strnih žita - kvalitetna kabasta hrana u uslovima visokih temperatura i suša

Last year (2012) will be marked as one of the worst in the History of Agriculture in Republic of Serbia. Heat and drought affected low quantity and quality of forage. In the same year we had lack of hay and maize silage. According weather forecast and anti­cipated climatic changes in the future, farmers need to found new ways to provide forage, especially in the "no irrigation" plant farming. In that way, ensiling of whole-crop cereals could be one of the solutions, because of theirs nutritive values, yields and all risks of heat and drought from planting to harvesting.Protekla 2012. god. u istoriji poljoprivredne proizvodnje u Srbiji biće označena kao jedna od najnepovoljnijih, posebno kada je u pitanju količina i kvalitet kabaste stočne hrane za ishranu preživara, naročito mlečnih krava (nedostatak i slab kvalitet sena i silaža kukuruza). Sa postojećim klimatskim predviđanjima u budućnosti se može očekivati nedostatak kabaste stočne hrane u uslovima "suvog" ratarenja. Jedno od mogućih rešenja je korišćenje strnih žita za pripremanje silaža i sena, kako zbog svojih nutritivnih vrednosti, tako i zbog prinosa i smanjenih rizika od suše i visokih temperatura

Thermo-mechanical properties of rigid polyurethane foams with cement addition

The parameters of foam preparation, such as addition of fillers, have a significant effect on the properties of polyurethane foams. The goal of this work was to study the effect of the cement addition on the thermo-mechanical properties of rigid polyurethane foams. Isocyanate component was based on polymeric diphenylmethane diisocyanate, and polyol component was polyether type, with addition of castor oil as polyol. It was estimated that the addition of cement increased the values of foam compressive strength and permanent deformation. Compressive strength increased even more than 90% with 20 wt% of cement. Further increase of the cement loading deteriorates the mechanical properties of foamed material because it distorts cellular structures of obtained materials. Addition of cement increased the value of the glass transition temperature of polyurethane foam. The highest increase in the value of glass transition temperature, for 7.5ºC, was achieved by the addition of 20 wt% of cement

Role of cystatin C and renal resistive index in assessment of renal function in patients with liver cirrhosis

AIM: To evaluate the clinical significance of cystatin C and renal resistive index for the determination of renal function in patients with liver cirrhosis. METHODS: We conducted a study of 63 patients with liver cirrhosis. A control group comprised of 30 age and gender-matched healthy persons. Serum cystatin C was determined in all study subjects and renal Doppler ultrasonography was made. Estimated glomerular filtration rate from serum creatinine (GFR(Cr)) and cystatin C (GFR(Cys)) was calculated. RESULTS: We confirmed significant differences in values of cystatin C between patients with different stages of liver cirrhosis according to Child-Pugh (P = 0.01), and a significant correlation with model of end stage liver disease (MELD) score (r(s) = 0.527, P lt 0.001). More patients with decreased glomerular filtration rate were identified based on GFR(Cys) than on GFR(Cr) (P lt 0.001). Significantly higher renal resistive index was noted in Child-Pugh C than in A (P lt 0.001) and B stage (P = 0.001). Also, a significant correlation between renal resistive index and MELD score was observed (r(s) = 0.607, P lt 0.001). Renal resistive index correlated significantly with cystatin C (r(s) = 0.283, P = 0.028) and showed a negative correlation with GFR(Cys) (r(s) = -0.31, P = 0.016). CONCLUSION: Cystatin C may be a more reliable marker for assessment of liver insufficiency. Additionally, cystatin C and renal resistive index represent sensitive indicators of renal dysfunction in patients with liver cirrhosis

Vulnerability to natural disasters in Serbia: spatial and temporal comparison

The frequency of natural disasters and the extent of their consequences at a global level are constantly increasing. This trend is partially caused by increased population vulnerability, which implies the degree of population vulnerability due to high magnitude natural processes. This paper presents an analysis of vulnerability to natural disaster in Serbia in the second half of the twentieth and the early twenty-first century. Vulnerability changes were traced on the basis of demographic–economic indicators derived from statistical data for local government units (municipalities) provided by the Statistical Office of the Republic of Serbia. Calculations were performed in the geographical information system environment. The results of the study show that spatial and temporal vulnerability variations are causally correlated with changes in the selected components. Significant rise of vulnerability is related to urban areas, while lower values are characteristic for other areas of Serbia; this is primarily a consequence of different population density