Browsing by Author Costov, Ioan

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Showing results 1 to 9 of 9
Issue DateTitleAuthor(s)
29-Oct-1986Chemiluminescence tester for underwater research, etc. ­ consists of PVC cylinder with three parallel photovoltaic cells and aluminium coilDumitrescu, Emil; Costov, Ioan; Blaga, Iulian; Ias, Ioan
30-Aug-1986Chemiluminescent mixt. ­ contg. phenyl ester derivs. of oxalic acid in which aromatic hydrogen atoms are substd.Dumitrescu, Emil; Craiu, Cornel; Costov, Ioan; Blaga, Iulian
30-Sep-1986New chemiluminescent cpds. ­ based on bis­-chloro­-carbomethoxy­- or carbo:butox-y­phenyl­-oxalate(s)Anghelescu, N.; Dumitrescu, Emil; Craiu, Cornel; Costov, Ioan; Parmac, Sorin
30-Sep-1984Phosphate recovery from residual acidic waters by consecutive neutralisation first with chalk or lime and then lime, with pptn. of calcium phosphateCruceru, Mihail; Dumitrescu, Emil; Parmac, Sorin; Coroiu, Cornel; Costov, Ioan
30-Sep-1986Prepn. of oxalate(s) of di:phenyl or bis­O­nitrophenyl ­ obtd. by condensn. of methyl (I) phenoxide(s) and oxalyl­chloride, in benzene or tolueneAnghelescu, N.; Dumitrescu, Emil; Costov, Ioan; Parmac, Sorin; Craiu, Cornel
28-Jun-1985Purifying residual water contg. organic substances by adding urea and formaldehyde, sepg. the resin by filtration or sedimentation and purifying the water biologically after neutralisingParmac, Sorin; Buliga, A.; Chiru, Epsica; Dumitrescu, Emil; Costov, Ioan; Cruceru, Mihail; Varlam, C.; Pristavu, N.
30-Aug-1985Recovering coagulant from treating residual waters by dissolving hydroxide formed, residual and unused acid, adding and formaldehyde, washing aminoplast and reusing waterParmac, Sorin; Buliga, A.; Cruceru, Mihail; Dumitrescu, Emil; Costov, Ioan; Ghiorghiu, G.
15-Sep-1988Recuperation of silver from photosensitive material waste ­ consists of washing with sodium hydroxide soln., sludge separation, and alkaline fluxing after dryingParmac, Sorin; Costov, Ioan; Trestioreanu, F.; Beleaua, Victor; Polgar, I.; Stanciu, M.
30-Oct-1984Treating residual acidic waters from chemical fertiliser industry with phosphorus and opt. phospho-gypsum by use as reagent and creation of high calcium carbonate contentCruceru, Mihail; Coroiu, Cornel; Parmac, Sorin; Dumitrescu, Emil; Costov, Ioan