A toner for developing an electrostatic image, contains a binder resin having an acid value of from approximately 10 mgKOHg to approximately 20 mgKOHg and carbon black having a surface carboxyl group density of from approximately 2\xd710\u22126 molm to approximately 8\xd710\u22126 molm2, and is prepared in an aqueous medium. The methods involve applying to a substrate a first aqueous composition containing a boron compound, a source of zinc, and ammonia, followed by application of a second aqueous composition containing an alkali metal silicate. A text segment in a document is identified to be indicative of a mood of the document. The detector is optically coupled to a photomultiplier tube which generates electrical pulses proportional in amplitude to the intensity of the scintillations, and therefore are an indication of the energy of the fast neutrons impinging upon the detector. The weather information is generally received from a remote weather information database, processed by at least one real-time data server, and transmitted through a communication module to a plurality of users in accordance with predetermined parameters that may be set by the users themselves. According to an embodiment, the plasma display apparatus is driven by dividing a sub-field into at least an address period and a sustain period.