Abstract: Provided are a security protection method and apparatus. The security protection method includes: generating software versions based on diversity compilation, and constructing a software version pool using the software versions as heterogeneous functional equivalents; and dynamically deploying a software version on a network element according to the software version pool.

Abstract: A detection apparatus includes a support, at least one driving apparatus provided on the support, and a first movable module. The at least one driving apparatus includes a first driving apparatus, and the first driving apparatus is connected to the first movable module. The first movable module is provided with a first sliding assembly, and a first camera connected to the first sliding assembly. The first driving apparatus is configured to control the first sliding assembly to move in a first direction to drive the first camera to move close to or away from a material to be photographed. An included angle between the first direction and a vertical direction is less than or equal to a preset angle threshold.

Abstract: Disclosed is an urban non-metallic pipeline leakage location method, the method comprise the following steps: determining whether leakage occurs in a pipeline through numerical simulation law analysis or a Markov chain-based flow analysis method; for a leaking pipeline, establishing an inverse-transient control equation for non-metallic pipeline gas leakage, and obtaining pressure and flow rate data of each measuring point in different periods of time through experiments and substituting the data into the control equation to analyze experimental data; and defining a nonlinear programming problem of an objective function with a least squares criterion, and applying a sequential quadratic programming method to minimize the objective function, so as to determine the size and position of the leakage.

Abstract: Disclosed is an urban non-metallic pipeline leakage location method, the method comprise the following steps: determining whether leakage occurs in a pipeline through numerical simulation law analysis or a Markov chain-based flow analysis method; for a leaking pipeline, establishing an inverse-transient control equation for non-metallic pipeline gas leakage, and obtaining pressure and flow rate data of each measuring point in different periods of time through experiments and substituting the data into the control equation to analyze experimental data; and defining a nonlinear programming problem of an objective function with a least squares criterion, and applying a sequential quadratic programming method to minimize the objective function, so as to determine the size and position of the leakage.