Abstract: A detector for detecting the removal and/or insertion of a weapon out of and/or into a holster. The detector may transmit a message each time the weapon is removed from the holster. A recording system may receive the message and determine whether or not it will begin recording the data it captures. A detector may detect the change in a magnitude of an inductance and/or an impedance of a circuit to detect insertion and removal of the weapon into and out of the holster. The holster is configured to couple to the detector to position the detector to detect insertion and removal of the weapon. An adhesive tape may couple a detector to a holster.

Abstract: Systems and methods for growing polycrystalline silicon ingots are described. The systems and methods involve placing an initial charge of polysilicon in a crucible, using a direct solidification/heat exchanger method furnace to melt the initial charge to form a melt, and then introducing additional polysilicon to the melt while the melt and crucible are within the furnace. The additional polysilicon may be added to the crucible in order to bring the melt to any desired volume, including until the crucible is full or topped off. An augmenting mechanism, such as a hopper, may be used to introduce additional polysilicon to the melt. The hopper may have a silicon introduction controller that controls the introduction of polysilicon into the melt. Other embodiments are described.