Abstract: The disclosed embodiments are directed to improvements in log-structured merge (LSM) tree databases. In one embodiment, a method is disclosed comprising receiving data to be written to a log-structured merge (LSM) tree, the data including a key and value; determining that an in-memory buffer lacks capacity to store the data to be written; compacting key-ranges stored in at least one level of the LSM tree stored in an object storage device (OSD), each of the key-ranges associated with a respective object identifier; generating a key range object, the key range object including object identifiers associated with a subset of the key-ranges; erasing physical blocks corresponding to each of the object identifiers included in the key range object; and writing the key range object to at least one physical block of the OSD.

Abstract: The disclosed embodiments are directed to improvements in log-structured merge (LSM) tree databases. In one embodiment, a method is disclosed comprising receiving data to be written to a log-structured merge (LSM) tree, the data including a key and value; determining that an in-memory buffer lacks capacity to store the data to be written; compacting key-ranges stored in at least one level of the LSM tree stored in an object storage device (OSD), each of the key-ranges associated with a respective object identifier; generating a key range object, the key range object including object identifiers associated with a subset of the key-ranges; erasing physical blocks corresponding to each of the object identifiers included in the key range object; and writing the key range object to at least one physical block of the OSD.

Abstract: The present invention provides devices and methods for delivering a population of cells or a therapeutic agent to a subject in need thereof.

Abstract: A torque sensor bearing arrangement for a shaft having first and second bearings, each with respective inner ring and outer rings with rolling elements therebetween. The bearings are located at first and second ends of the shaft. First and second sensing rings are connected to the outer rings of the bearings. First and second marking rings are connected to the inner rings, spaced apart from and aligned with the respective first and second sensing rings. The marking rings each have a wavy surface facing the respective sensing ring to form respective first and second sensors from the respective sensing ring—marking ring pairs. The sensors detect a rotational angle position of the shaft and provide a signal. A controller receives signals from the first and second sensors and calculates at least one of torque or an angular speed of the shaft based on signals from the first and second sensors.

Abstract: A torque sensor bearing arrangement for a shaft having first and second bearings, each with respective inner ring and outer rings with rolling elements therebetween. The bearings are located at first and second ends of the shaft. First and second sensing rings are connected to the outer rings of the bearings. First and second marking rings are connected to the inner rings, spaced apart from and aligned with the respective first and second sensing rings. The marking rings each have a wavy surface facing the respective sensing ring to form respective first and second sensors from the respective sensing ring—marking ring pairs. The sensors detect a rotational angle position of the shaft and provide a signal. A controller receives signals from the first and second sensors and calculates at least one of torque or an angular speed of the shaft based on signals from the first and second sensors.