Abstract: A data access method based on a cloud computing platform, and a user terminal, are provided. The method is performed by a user terminal, and the method includes obtaining an access request for a data ciphertext of the cloud computing platform, the access request including a decryption key, and the decryption key including a user precise identity identifier and a user attribute identifier. The method further includes decrypting the data ciphertext into a data plaintext, in response to the user precise identity identifier belonging to an identity identifier set included in an access structure of the data ciphertext and/or in response to the user attribute identifier belonging to a user attribute identifier set included in the access structure of the data ciphertext.

Abstract: A data access method based on a cloud computing platform, and a user terminal, are provided. The method is performed by a user terminal, and the method includes obtaining an access request for a data ciphertext of the cloud computing platform, the access request including a decryption key, and the decryption key including a user precise identity identifier and a user attribute identifier. The method further includes decrypting the data ciphertext into a data plaintext, in response to the user precise identity identifier belonging to an identity identifier set included in an access structure of the data ciphertext and/or in response to the user attribute identifier belonging to a user attribute identifier set included in the access structure of the data ciphertext.

Abstract: A steady state control method for a three-phase double-mode inverter. Off-grid steady state control is composed of outer loop power droop control, voltage feed-forward quasi-resonant control, and inner current loop dead-beat control. Therefore, the response speed of the inverter is raised, and the influence caused by the load fluctuation of a micro-grid is inhibited. Based on the off-grid steady state control, grid-connected steady state control introduces phase lead control to the power droop control. Therefore, the output voltage of the inverter is always slightly ahead of the power grid voltage, which avoids the energy pour backward phenomenon of the inverter due to a phase error, and realizes stable and reliable running in the grid-connected mode.

Abstract: A steady state control method for a three-phase double-mode inverter. Off-grid steady state control is composed of outer loop power droop control, voltage feed-forward quasi-resonant control, and inner current loop dead-beat control. Therefore, the response speed of the inverter is raised, and the influence caused by the load fluctuation of a micro-grid is inhibited. Based on the off-grid steady state control, grid-connected steady state control introduces phase lead control to the power droop control. Therefore, the output voltage of the inverter is always slightly ahead of the power grid voltage, which avoids the energy pour backward phenomenon of the inverter due to a phase error, and realizes stable and reliable running in the grid-connected mode.

Abstract: A switch mode nucleic acid aptamer probe includes a probe main body, a fluorescence generating unit and a fluorescence quenching unit which are respectively connected to two ends of the probe main body. The probe main body includes a nucleic acid aptamer fragment with a function of specifically recognizing target tumor cell and a nucleic acid fragment linked to the nucleic acid aptamer fragment by a connection fragment with a length of 7˜15 nm so as to form a hairpin structure. The ability of competitive hybridization of the nucleic acid fragment with the nucleic acid aptamer fragment is weaker than that of the target tumor cell. The use of the probe of the invention can be at least one of specific detection of tumor living cell in buffer solution, effective detection of tumor living cell in serum, and real-time fluorescence imaging and intravital detection of tumor in living body.

Abstract: The present invention relates to a method for preparing self-assembled silicon nanotubes (SiNTs) by a hydrothermal method. A method for preparing self-assembled SiNTs comprises forming a mixture of silicon oxide and water in a sealed container, wherein the mixture has a silicon oxide to water ratio of no more than 10% by weight. The mixture is maintained at a constant temperature and a constant pressure, and the mixture is stirred for a period of time. Self-assembled SiNTs may be formed with an average inner diameter of less than 5 nm and an average outer diameter of around 15 nm. The present invention completely utilizes non-toxic raw materials, and the materials and process do not pollute the environment, so the method satisfies the development trends of the modern industry.

Abstract: Sandwiched tubular safety airbags are disclosed. An example sandwiched tubular safety airbag comprises an air tube truss (2) formed by a bending hollow air tube (21), a lower air cushion (4) and an upper air cushion (1). The lower air cushion (4) is provided at the bottom of the air tube truss (2), and the upper air cushion (1) is provided on top of the air tube truss (2). An inlet opening (5) is provided on the bottom surface of the lower air cushion (4). The end openings of the hollow air tube (21) of the air tube truss (2) are charging openings (3) of the air tube truss (2). Charging holes (11) are provided at joints of the lower air cushion (4) with the charging openings (3) of the air tube truss (2). The top of the air tube truss (2) is provided with one or more discharging holes (6) communicating with the upper air cushion (1).

Abstract: A non-contact type of deep-diathermy apparatus comprises a microwave source (1), a microwave radiator (2), a microwave focusing device (3), a temperature-measuring device (4) and a computer based control and display device (5). An output port of the microwave radiator (2) is spaced apart from a surface of a diathermized position of a medium to be diathermized by a predetermined distance. The microwave focusing device (3) is placed in front of the output port of the radiator (2) and attached to the output port of the radiator (2) for focusing the microwave from the radiator (2) on a point within the predetermined distance. This apparatus can be used to kill cancer cells or reduce their vitality in deep parts of the medium and will not cause the surface of the medium to be burnt.