Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a transmitter may detect at least one distance between the transmitter and a receiver. The transmitter may transmit, to the receiver, information using a selected band of a wide band or a narrow band, where the selected band is based at least in part on the at least one distance. Similarly, in some aspects, a receiver may detect at least one distance between the receiver and a transmitter. The receiver may receive, from the transmitter, information using a selected band of a wide band or a narrow band, where the selected band is based at least in part on the at least one distance. Numerous other aspects are described.

Abstract: A method for production of metallic titanium and metallic titanium obtained with the method are provided. The method for production of metallic titanium comprises: taking a titaniferous material as the anode, a metal material as the cathode, and a molten salt material as the electrolyte, and carrying out electrolysis under electrolytic conditions to obtain metallic titanium; wherein, the titaniferous material is in a porous structure, with 1 mm˜10 mm average pore diameter and 20%˜60% porosity, and at least a part of the titanium element in the titaniferous material exists in the form of TiOx, wherein, 2>x>0. With the method provided in the present invention, the process is simplified, and the yield ratio and purity of the obtained metallic titanium are higher.

Abstract: The invention provides a method for producing titanium tetrachloride by using a low grade titanium material, and belongs to the chemical field. The technical problem to be solved is to provide a method for producing titanium tetrachloride by using a low grade titanium material capable of continuous industrialized production. The method is characterized in that the low grade titanium material containing a certain proportion of titanium carbide is caused to directly react with chlorine at 600-700° to produce the titanium tetrachloride. Long-time continuous and stable operation can be realized by using the process parameters of the method, and chlorination rate of the titanium carbide in the titanium material reaches above 90%, so that the titanium material can be better used for producing the titanium tetrachloride.