Abstract: A process and a system for producing a stock solution for production of a ferrofluid is provided. The process includes contacting an acidic solution in a reaction container filled with an excess of a bulk material containing Fe(III) and optionally Fe(II). The acid reacts with the bulk material to form the stock solution (Ls) having dissolved ferric (Fe(III)) and optionally ferrous (Fe(II)) ions which is then separated from the bulk material.

Abstract: The invention relates to a canal control system for controlling the water level or water flow in a canal system (2), comprising: (a) a centralized master controller (20), (b) a local slave controller (30), (c) a wireless communication system between the centralized master controller and the local slave controller, (d) a (fixed) reference point (8) or (movable) marker (11) relating to the water level in the canal system, and (e) an adjustable actuator (9) in the canal system, such as agate or pump, whereby the local slave controller comprises a mobile device (13) capable of displaying a human-readable instruction which an operator can act upon to set the adjustable actuator. The operator takes a picture of the water level and/or of the setting of the adjustable actuator. The data of the picture is used for updating a mathematical model of predictive control of the canal system and for calculating the setting of the present actuator and for determining which actuator is to be visited next by the operator.

Abstract: A compact, balanced, up to three degrees of freedom measuring interferometer which enables fiber delivery of an optical source without periodic nonlinearity, an interferometer system, and method for using an interferometer to measure up to three degrees of freedom is disclosed.

Abstract: The invention provides a process for depositing a coating onto particles being pneumatically transported in a tube. The process comprising the steps of providing a tube having an inlet opening and an outlet opening; feeding a carrier gas entraining particles into the tube at or near the inlet opening of the tube to create a particle flow through the tube; and injecting a first self-terminating reactant into the tube via at least one injection point downstream from the inlet opening of the tube for reaction with the particles in the particle flow. The process is suitable for atomic layer deposition and molecular layer deposition. An apparatus for carrying out the process is also disclosed.