97results about How to "Safe use" patented technology

In the system of the invention, a music playing data file is extracted from a given musical work resource such as an electronic music score data file, a printed sheet of music and an audio signals of a musical performance, to be utilized for playing music automatically by means of a tone generator device. The extracted music playing data file is encrypted using an encryption key to be stored in a storage device or to be transmitted to an automatic music playing apparatus. The stored or the transmitted music playing data file is decrypted beforehand to be used for automatic music playing. After the decrypted music playing data file has been utilized, the decrypted music playing data file is deleted from the system so that no unencrypted data file remains in the system.

The invention discloses a microwave chemical method for complete extraction of fluorine and rare earth in bastnaesite concentrate. The microwave chemical method comprises the four steps of alkali transfer defluorination of bastnaesite through irradiation with microwaves, microwave-assisted fluorine leaching, solid-liquid separation of leaching liquid and microwave-assisted rare earth leaching. According to the method, a hydrochloric acid solution for leaching the rare earth does not contain fluorine ions, fluorine interference in subsequent processes such as impurity removal and separation of the rare earth is completely avoided, stirring is not needed when the fluorine and the rare earth are leached through the microwaves, automatic control is easy to achieve, the fluorine and the rare earth are leached at a high speed and a short time, the fluorine and a small amount of residual alkali in slag can be complete leached through two times of leaching and fluorine-containing wastewater is not discharged, the rare earth can be completely extracted through one time of leaching; and the method has the outstanding advantages of short process flow, short time consumption and low energy consumption, remarkably reducing the use amount of alkali and acid, reducing the production cost, avoiding discharging four wastes and the like, and the fluorine and the rare earth in the bastnaesite can be completely recovered, and residues can be safely utilized.

This encryption device (500) is provided with an encryption unit (504), a detection element generation unit (505), and a transmission unit (506). The encryption unit (504) encrypts plain text using one of two keys which form a pair, to generate an encrypted text in which the plain text is encrypted, and which is capable of being homomorphically calculated. The detection element generation unit (505) uses the one key and the encrypted text to generate a detection element E used to detect alterations of the encrypted text. The transmission unit (506) transmits the encrypted text and the detection element.