TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The silver paste preferably comprises 45-48 wt.% spherical silver powder, 6-8 wt.% silver flake, 2-4 wt.% nickel powder, 4-6 wt.% glass powder, 38-45 wt.% organic carrier, 0.3-0.4 wt.% organic antiaging agent, 0.5-0.8 wt.% organic additives and 1-1.5 wt.% inorganic additives. The silver paste further comprises 0.2-0.3 wt.% leveling agent, 0.2-0.3 wt.% defoamer, 0.2-0.3 wt.% thixotropic agent, 0.2-0.3 wt.% dispersant and glass powder. The inorganic additive is chosen from copper(I) oxide, nickel oxide, manganese oxide and bismuth(III) oxide. The glass powder comprises 30-60 wt.% bismuth oxide, 10-15 wt.% boron(III) oxide, 5-15 wt.% silica, 5-15 wt.% zinc oxide, 5-15 wt.% tellurium dioxide, 10-20 wt.% copper oxide, 1-3 wt.% aluminum fluoride and 1-5 wt.% zirconium dioxide. The coupling agent is chosen from titanate coupling agent, aluminate coupling agent, bimetallic coupling agent, silane coupling agent, phosphate coupling agent and borate coupling agent. Preferred Properties: The average particle diameter of spherical silver powder, silver flake and nickel powder is 0.8-1.5 mu m, 2-3.5 mu m and 1-3 mu m, respectively.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The organic antiaging agent is chosen from dimethyltin, dioctyltin, tetraphenyltin, dibutyltin, tributyltin, triphenyltin and dimethyltin dineodecanoate. The organic additive is organosilicon and/or coupling agent. The organic carrier consists of 1.5-15 wt.% organic resin, 70-90 wt.% organic solvent and 0.5-8 wt.% surfactant. The organic solvent is chosen from diethylene glycol butyl ether, diethylene glycol butyl ether acetate, n-butanol and terpineol. The surfactant is chosen from diethyl phthalate, Span 80 (RTM: sorbitan monooleate) and cetyl alcohol.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The organic resin is chosen from ethyl cellulose, nitrocellulose and phenolic resin. The organosilicon compound is chosen from methyl silicone oil, dimethyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen silicone oil, methyl phenyl silicone oil, methyl chlorophenyl silicone oil, methylethoxy silicone oil, methyl trifluoropropyl silicone oil, methyl vinyl silicone oil, hydroxy methyl silicone oil, ethyl hydrogen silicone oil, hydroxy-containing hydrogen silicone oil and cyanide-containing silicone oil.