Formation of Cadmium Sulphide - Manganese(2)Sulphide Solid Solutions by Coprecipitation from Aqueous Solutions of Corresponding Sulphate by Ammonium Sulphide

When a 0.27 M aqueous solution of (NH4)2S, in a quantity 10 molO/o short of the stoichiometric value, is added to an aqeuous solution of CdS04 and MnS04 of various compositions, with 8042- being 0.3 M, a continuous CdS : MnS solid solution is not formed: saturation is reached for at most about 0.1 molO/o MnS, the corresponding relative concentration of MnS04 being 4 molO/o. With increasing this concentration to 20 mol O/o, MnS begins to precipitate in substantial amounts, reaching 19.8 molO/o for MnS04 equal to 50 molO/o. Debye-Scherrer diagrams show that the precipitates are quasi amorphous, composed essentially of cubic CdS with certain quantities of hexagonal CdS and MnS. This makes it impossible to distinguish, by these diagrams only, mechanical mixtures from solid solutions

Thermogravimetric Analysis of Cadmium Sulphide-Manganese Sulphide Systems Obtained by Coprecipitation

CdS-MnS systems obtained by coprecipitation from aqueous solutions of corresponding sulphates by ammonium sulphide were dried for months over Silicagel and then submitted to thermogravimetric analysis. Their content of water and of excess sulphur passes through minima in the critical zone of precipitation, where the precipitates contain very nearly 0.1 mol O/o MnS. It is believed that the minima correspond to a minimum of specific surface of the precipitates and that this minimum separates the region of formation of CdS : MnS solid solutions from the region towards greater contents of MnS, where coprecipitation of the saturated solid solution CdS : MnS and MnS occurs

Impact of IT on organizations in modern conditions

Information technology, especially the internet, exerted strong influence on organizational systems. It has enabled flexibility and the establishment of decentralized and dispersed business organizations. Conception of the organization based on the principle of ‘integrated decentralization’ is the opposite of concentrated and centralized organizations that had dominated the traditional organizations of the past. Information technology has largely contributed to the establishment of integrated decentralized organization because companies have been able to decentralize their parts in the general area, and then to integrate them at a centralized level, with the establishment of specific functions for all decentralized areas. This paper further discusses the impact of IT on the design of organizations, as well as the place and role of man in the information society