The present disclosure includes a shrouded fluid turbine that generates large wake expansion to generate power coefficients greater than the Betz power coefficient of 1627 based on maximum system area. The first method of manufacturing an active material comprises a hydrothermal synthesis step of heating a mixture containing a lithium source, a phosphate source, a vanadium source, water, and a reducing agent to 100 to 195\xb0 C. Encrypted communication is performed between each remote node and the center node by using the corresponding one of the shared random-number strings K1 to KN as a cryptographic key. The semiconductor chip is attached to a center portion on the top surface of the board and provided with a plurality of electrode terminals. The cleaning system can include a series of nozzles having assorted configurations and features which provide uniform and efficient rinsing of excess material. For a given segment in the sequence, the method includes calculating a set of frequency domain coefficients corresponding to the given segment, and identifying local peaks in the set of frequency domain coefficients by applying a threshold.