Abstract: This application relates to load balancing for a number of partitions of a network-based storage service. Each partition includes a number of server devices and/or network devices located in a data center and configured to provide access to storage resources hosted within the data center. User accounts are assigned to a particular partition such that requests related to a particular user account are routed to that partition. Periodically, a load balancing algorithm is executed to re-assign user accounts to different partitions to rebalance resource consumption across the different partitions. The load balancing algorithm can balance resource consumption for any number of resource types by generating a vector of resource utilization parameters for each user account, sorting the plurality of user accounts into clusters based on the vectors, and mapping at least some user accounts to different partitions.

Abstract: This application relates to load balancing for a number of partitions of a network-based storage service. Each partition includes a number of server devices and/or network devices located in a data center and configured to provide access to storage resources hosted within the data center. User accounts are assigned to a particular partition such that requests related to a particular user account are routed to that partition. Periodically, a load balancing algorithm is executed to re-assign user accounts to different partitions to rebalance resource consumption across the different partitions. The load balancing algorithm can balance resource consumption for any number of resource types by generating a vector of resource utilization parameters for each user account, sorting the plurality of user accounts into clusters based on the vectors, and mapping at least some user accounts to different partitions.

Abstract: The free-flow pump comprises an impeller (11, 22, 33) with an impeller base that is constituted by a front side (14, 5 24) of a hub body (12, 23) projecting at the center of the impeller (11, 22, 33) and by a disk surface (18, 28) located deeper than the front side (14, 24) of the hub body (12, 23) and reaching to an outer circumference of the impeller with its maximum depth. The disk surface (18, 28) is provided with vanes (19, 29, 34) comprising open vane front sides (20, 30, 35) adjoining the hub body (12, 23) at their inner end and extending from there to the outer circumference of the impeller (11, 22, 33). To avoid material accretions in front of the impeller (11, 22, 33) it is suggested that at least within an inner third of its radius, the impeller base is not located deeper with respect to the inner end of the vane front sides (20, 30, 35) than at most one sixth of the height difference (H) between the inner end of the vane front sides (20, 30, 35) and the maximum depth of the disk surface (18, 28).

Abstract: The free-flow pump comprises an impeller (11, 22, 33) with an impeller base that is constituted by a front side (14, 5 24) of a hub body (12, 23) projecting at the center of the impeller (11, 22, 33) and by a disk surface (18, 28) located deeper than the front side (14, 24) of the hub body (12, 23) and reaching to an outer circumference of the impeller with its maximum depth. The disk surface (18, 28) is provided with vanes (19, 29, 34) comprising open vane front sides (20, 30, 35) adjoining the hub body (12, 23) at their inner end and extending from there to the outer circumference of the impeller (11, 22, 33). To avoid material accretions in front of the impeller (11, 22, 33) it is suggested that at least within an inner third of its radius, the impeller base is not located deeper with respect to the inner end of the vane front sides (20, 30, 35) than at most one sixth of the height difference (H) between the inner end of the vane front sides (20, 30, 35) and the maximum depth of the disk surface (18, 28).

Abstract: An impeller plate of an impeller of a centrifugal pump, particularly a channel impeller pump, for pumping liquids with solid or gaseous admixtures, is provided with at least one wide vane that is displaced toward the impeller drive by a distance D so that the impeller chamber is enlarged by a rearward portion thereof. In addition, the impeller comprises at least one auxiliary vane having a center width at between 25%-75% of the width of the wide vane. This arrangement improves particularly the gas transporting ability of the pump.

Abstract: An impeller plate of an impeller of a centrifugal pump, particularly a channel impeller pump, for pumping liquids with solid or gaseous admixtures, is provided with at least one wide vane that is displaced toward the impeller drive by a distance D so that the impeller chamber is enlarged by a rearward portion thereof. In addition, the impeller comprises at least one auxiliary vane having a center width at between 25%-75% of the width of the wide vane. This arrangement improves particularly the gas transporting ability of the pump.

Abstract: Apparatus for detecting the presence of a metal strand in paper, for example in a document or bank note of which one wishes to check the authenticity, comprises means for moving the paper in front of a detection head comprising a coil a resonance circuit supplied by a high frequency source, the frequency of which is close to the resonance frequency of the circuit. The high frequency voltage is modulated by variation of the current in the resonance circuit when the strand passes the detection head. After filtering and amplification, the demodulated signal is applied to a trigger circuit to obtain a digital signal. Delivery of the digital signal to an output terminal is checked by means of a reading window, the opening of which is controlled by the means for moving the paper. The output of the detection head is also applied to a second trigger for checking maintenance of a continuous component in the signal from the resonance to verify continuity of the coil circuit.

Abstract: Documents are caused to pass in front of a light source incorporating optical fibres and the reflected light is collected by means of photoelectric elements. The collected reflected light is compared with a reference value. A row of photoelectric elements is used which successively transmits, by multiplexing, the signals delivered simultaneously by a row of the photoelectric elements. The analog signals are converted into digital signals, and a totalling and averaging of the digital signals is carried out in order to determine the state of general dirtiness of the document. The number of photoelectric elements of the row covered by the document is counted to inspect the width of the document and detect the presence of dog ears. In addition the number of photoelectric elements delivering a signal which exceeds a certain level is counted.

Abstract: Method for the detection, on a sheet of paper, of an area which becomes fluorescent when it is exposed to ultraviolet radiation, in which the paper sheet passing in front of a detector is illuminated by means of a source of ultraviolet light modulated by a frequency of between 1 and 10 KHz. The modulated fluorescent radiation is detected, amplified and demodulated by means of an amplification circuit and a demodulation circuit providing a first signal. The intensity of the ultraviolet source is measured by a photo-electric member associated with a detection and demodulation circuit supplying a second signal. This second signal is used to regulate the level of operation of at least one trigger which operates to provide an output, corresponding to the fluorescent radiation, when the level of the first signal supplied to the trigger is at at least the trigger operating level.