Abstract: Scale inhibitor compositions and methods for treating a subterranean hydrocarbon producing formation and/or oilfield equipment are disclosed. The scale inhibitor composition comprises a scale inhibitor comprising at least one copolymer, a corrosion inhibitor comprising at least one acid, a neutralizing agent, and an optional solvent. The methods inhibit corrosion of metal surfaces by contacting at least one metal surface with at least one scale inhibitor composition and treat the subterranean formation by contacting a subterranean zone of the subterranean formation with the scale inhibitor composition such that corrosive effects of an acidizing composition on metal surfaces in contact therewith are reduced.

Abstract: The invention generally relates to systems and methods for coordinating participation in, and payment for, events. In particular, the invention allows a person to initiate a group event without exposing themselves to a full cost of the event, even where full payment is traditionally collected through a single bill or prior to the event. In some aspects, the invention provides a method of organizing an event that includes broadcasting information about an event to potential participants, receiving a commitment to pay from participants, and charging each participant their share while paying a full event cost, so that no one person must pay the full cost.

Abstract: Automatically controlled continuous process for the diazotization or tetrazotization of aromatic amines in which the rate of addition of the inorganic nitrite is controlled by a polarovoltric method. The process comprises adding regularly and continuously to a reactor an aqueous slurry or solution of the amine containing sufficient acid for the diazotization process and simultaneously adding to the reactor a solution of an inorganic nitrite at a rate which is automatically regulated by a polarovoltric controller to ensure that a pre-selected concentration of unreacted nitrous acid is maintained in the reactor throughout the whole period of the reaction.

Abstract: Azo dyestuff coupling process in which the amount of excess diazo or coupling component is continuously monitored and the addition of diazo component or coupling component to the reaction is automatically controlled by means of an automatic chemical analyzer which incorporates a dialyzer module, which process is characterized in that azo metal salt pigments derived from sulphonated intermediates can be obtained by precipitating the pigment by adding a water-soluble metal salt to the water-soluble sulphonated azo dyestuff at some stage prior to the passage of the sample stream through the dialyzer.

Abstract: Azo pigment coupling process in which the amount of excess diazo or coupling component is continuously monitored and addition of diazo component or coupling component to the reaction is automatically controlled by means of an automatic chemical analyzer which incorporates a dialyser module. The process involves a method of automatically controlling the coupling reaction by a continuous-flow chemical analyzer which continuously samples the reaction mixture and analyzes it for unreacted diazo or coupling component by dialysis and colorimetry, and automatically adjusts the rate of addition of this component to the reaction mixture to keep the concentration of unreacted component within a pre-set range during the period of the reaction.