Abstract: A method for determining well wall collapse of a single well for a fractured-vuggy reservoir is provided. The method includes following steps: S1, treating the single well of the fractured-vuggy reservoir as an isolated reservoir; S2, calculating a water influx rate for the fractured-vuggy reservoir; S3, substituting a formula of the water influx rate into a material balance equation; S4, calculating a change of an oil productivity index without considering the well wall collapse; S5, establishing an optimizing model for obtaining the oil productivity index; S6, calculating the formation pressure at any time in production through step S3; S7, calculating the oil productivity index at any time through the formation pressure, and establishing an optimal objective function; and S8, calculating a difference between the oil productivity index at any time and the theoretically calculated oil productivity index at any time, and determining whether the difference meets an accuracy requirement.

Abstract: A preparation method of Yttrium oxide dispersed and strengthened titanium alloy powders. The method includes following steps: mixing alloying elements according to alloy element ratios of: 0.1 wt % to 1.0 wt % Y, 5.5 wt % to 6.8 wt % Al, 3.5 wt % to 4.5 wt % V, Ti as balance, preparing alloy ingots by vacuum smelting process, and performing forging and rolling process; performing mechanical treatment for forged and rolled alloy ingots, to obtain alloy rods that meet size requirement of plasma rotating electrode process; preparing titanium alloy powders based on alloy rods by the plasma rotating electrode process; preparing parameters are: rotating speed of the alloy rods is 25000 r/min to 35000 r/min, a feeding speed of the alloy rods is 1.0 mm/s to 2.0 mm/s, power of the plasma gun is 60 kw to 140 kw, a temperature of the inert gas is 200° C. to 400° C., oxygen content of atomization chamber not greater than 100 ppm.

Abstract: A preparation method of Yttrium oxide dispersed and strengthened titanium alloy powders. The method includes following steps: mixing alloying elements according to alloy element ratios of: 0.1 wt % to 1.0 wt % Y, 5.5 wt % to 6.8 wt % Al, 3.5 wt % to 4.5 wt % V, Ti as balance, preparing alloy ingots by vacuum melting process, and performing forging and rolling process; performing mechanical treatment for forged and rolled alloy ingots, to obtain alloy rods that meet size requirement of plasma rotating electrode process; preparing titanium alloy powders based on alloy rods by the plasma rotating electrode process; preparing parameters are: rotating speed of the alloy rods is 25000 r/min to 35000 r/min, a feeding speed of the alloy rods is 1.0 mm/s to 2.0 mm/s, power of the plasma gun is 60 kw to 140 kw, a temperature of the inert gas is 200° ° C. to 400° C., oxygen content of atomization chamber not greater than 100 ppm.

Abstract: This disclosure describes a map-matching module that supports a Global Positioning System (GPS) and provides a user with a best match trajectory corresponding to GPS sampling points taken at a low sampling rate. The best match trajectory is based upon a spatial-temporal analysis.

Abstract: Techniques for improving complex database queries are provided. A determination is made whether to adopt a static or dynamic query execution plan for a received database query based on metrics. When a dynamic query execution plan is adopted, the database query is separated into query fragments. A plan fragment is generated for each query fragment and executed to generate feedback for the plan fragment. The feedback from the execution of each plan fragment is used to initiate query rewrite rules to simplify the corresponding query fragments. The rewritten query fragments are combined to generate the dynamic query plan.

Abstract: This disclosure describes a map-matching module that supports a Global Positioning System (GPS) and provides a user with a best match trajectory corresponding to GPS sampling points taken at a low sampling rate. The best match trajectory is based upon a spatial-temporal analysis.

Abstract: This disclosure describes a map-matching module that supports a Global Positioning System (GPS) and provides a user with a best match trajectory corresponding to GPS sampling points taken at a low sampling rate. The best match trajectory is based upon a spatial-temporal analysis.

Abstract: This disclosure describes a map-matching module that supports a Global Positioning System (GPS) and provides a user with a best match trajectory corresponding to GPS sampling points taken at a low sampling rate. The best match trajectory is based upon a spatial-temporal analysis.

Abstract: Techniques for improving complex database queries are provided. A determination is made whether to adopt a static or dynamic query execution plan for a received database query based on metrics. When a dynamic query execution plan is adopted, the database query is separated into query fragments. A plan fragment is generated for each query fragment and executed to generate feedback for the plan fragment. The feedback from the execution of each plan fragment is used to initiate query rewrite rules to simplify the corresponding query fragments. The rewritten query fragments are combined to generate the dynamic query plan.

Abstract: Techniques for providing a route based on route-oriented vehicle trajectories are described. This disclosure describes receiving GPS logs and extracting route-oriented vehicle trajectory content from the GPS log data to pertain to a single trip. Next, the process maps each route-oriented vehicle trajectory to a corresponding road segment to construct a landmark graph. A landmark is a road segment frequently visited by route-oriented vehicles. The process includes receiving a user query with a starting point and a destination point; searching the landmark graph for a sequence of landmarks with corresponding transition times and a least amount of travel time. Then the process identifies and connects sets of road segments between each pair of consecutive landmarks, and displays a route to a user with a nearest landmark to the starting point, other landmarks along the route, and another nearest landmark to the destination point.

Abstract: Techniques for providing a route based on route-oriented vehicle trajectories are described. This disclosure describes receiving GPS logs and extracting route-oriented vehicle trajectory content from the GPS log data to pertain to a single trip. Next, the process maps each route-oriented vehicle trajectory to a corresponding road segment to construct a landmark graph. A landmark is a road segment frequently visited by route-oriented vehicles. The process includes receiving a user query with a starting point and a destination point; searching the landmark graph for a sequence of landmarks with corresponding transition times and a least amount of travel time. Then the process identifies and connects sets of road segments between each pair of consecutive landmarks, and displays a route to a user with a nearest landmark to the starting point, other landmarks along the route, and another nearest landmark to the destination point.

Abstract: This disclosure describes a map-matching module that supports a Global Positioning System (GPS) and provides a user with a best match trajectory corresponding to GPS sampling points taken at a low sampling rate. The best match trajectory is based upon a spatial-temporal analysis.