Author/Editor     Modic, Jurij
Title     Emisija motornih vozil v predoru in koncentracija COHb v krvi
Translated title     Motor vehicles emission in tunnel and COHb concentration in blood
Type     članek
Source     Zdrav Vestn
Vol. and No.     Letnik 67, št. 2
Publication year     1998
Volume     str. 75-8
Language     slo
Abstract     Background. All internal combustion engines produce exhaust gases containing noxious compounds: carbon monoxide (CO), nitrogen oxides (NOx), carbon oxides (CxHy) and smoke. In tunnel is most dangerous the carbon monoxide if it exceed an allowable level. In human blood the carbon monoxide causes increasing the concentration of carboxyhemoglobine (COHb) and in this case the bipoxy of web. With help of mathematical model the concentrations of some dangerous substances at the end of tunnel were calculated. For this case a differential equation also was developed and it shows the correlation between concentration of carbon monoxide in the air and concentration of carboxyhemoglobine in the blood. Methods. The constructed mathematical model shows circumstances in the tunnel (velocity of air moving as effect of induction, concentration of noxious substances and criterial number). Also a corresponding computer program was developed, which makes possible a quick and simple calculations. Al the results are proved by experiments. On the basis of known medical experiments we find out the correlation between the concentration of carbon monoxide in inhaling air the concentration of carboxyhemoglobine in human blood. Finally the differential equation was done, which shows a temporal connection between both parameters as a function of tunnel characteristics, human activity and "foloading" with carboxyhemoglobine. The differential equation was solved numerical by computer. All the results are presented in a graphic form as three dimensional charts. Results. We find out that if the concentrations of noxidous substances not exceed allowable level there is no direct danger of carboxyhemoglobine concentration in blood.(Abstract truncated at 2000 characters.)
Summary     Izhodišča. Vsi motorji z notranjim zgorevanjem oddajajo vrsto škodljivih snovi. V prvi vrsti so to ogljikov monoksid (CO), dušikovi oksidi (NOx), ogljikovodiki (CxHy) ter dim in saje. Med temi je v predoru nevarne predvsem ogljikov monoksid, če je njegova koncentracija prevelika. Na človeka deluje tako, da se v krvi veča koncentracija karboksihemoglobina, ki povzroča hipoksijo tkiv. Na osnovi matematičnega modela so izračunane koncentracije posameznih onesnaževalcev na koncu predora. S pomočjo za ta primer razvite diferencialne enačbe je prikazana odvinost med koncentracijo ogljikovega monoksida v zraku in med koncentracijo karboksihemoglobina v krvi. Metode. Izdelali smo matematični model, ki prikazuje razmere v predoru (histrost gibanja zraka kot posledico indukcije, koncentracijo škodljivih snovi in kriterijsko število), nato pa še računalniški program, ki omogoča hitro in enostavno računanje. izračunane rezultate smo eksperimentalno preverili. Nato smo na osnovi znanih eskperimentalnih podatkov poiskali korelacijo med koncentracijo ogljikovega monoksida v vdihanem zraku in koncentracijo karboksihemoglobina v človekovi krvi. Na tej osnovi smo izdelali diferencialno enačbo, ki ponazarja časovno povezavo med obema parametroma v odivnosti od značilnosti predova in njegove okolice, dejavnosti človeka in njegove "predobremenitve" s karboksihemoglobinom. Enačbo smo reševali numerično, s pomočjo računalnika, rešitve so prikazane grafično v obliko tridimenzionalnih diagramov. Rezultati. ugotovili smo, da pri razmerah, kakršne dovoljujejo tehnični predpisi, v predoru ni neposredne nevarnosti za preveliko koncentracijo karboksihemoglobina v krvi.(Izvleček prekinejn pri 2000 znakih.
Descriptors     MOTOR VEHICLES
VEHICLE EMISSIONS
AIR POLLUTANTS, ENVIRONMENTAL
CARBON MONOXIDE
CARBOXYHEMOGLOBIN
AUTOMOBILE DRIVING
ANOXIA