34 results about "Barrier method" patented technology

Methods and devices for measuring fluid properties include an electromagnetic sensor. The electromagnetic sensor includes a coaxial probe body having a first integral pressure barrier and a second integral pressure barrier formed from coaxial-feedthrough connector. The first integral pressure barrier and the second integral pressure barrier have a desired characteristic impedance.

Methods and apparatuses for making three-dimensional objects from a bindable powder are shown and described. A dynamically erected and/or expanded retaining barrier is provided which is erected and/or expanded during an object building operation to retain dispensed powder,

Methods and apparatus are provided for performing an expedited shoe test using an expandable casing portion as an annular fluid barrier. Such an expandable annular fluid barrier may be used in conjunction with cement if so desired but cement is not required. Further provided are methods and apparatus for successfully recovering from a failed expansion so that a shoe test can be completed without replacement of the expandable casing portion.

The invention discloses an image retrieval method based on contextual depth semantic information to mainly solve the problem that the existing image retrieval method is low in accuracy due to lack ofcontextual information. The image retrieval method based on contextual depth semantic information includes the following steps of (1) determining key points of an image by an adaptive polarization barrier method; (2) performing pre-training and fine-tuning on a convolutional neural network, constructing a polarization convolutional neural network including a region analysis layer and an iterativequantization layer; (3) extracting the contextual depth semantic features of the key points, storing the contextual depth semantic features in an index table, and completing offline indexing; (4) calculating the similarity between the image and each image in a database; (5) outputting the search result in a descending order of similarity. The image retrieval method based on contextual depth semantic information uses the contextual depth semantic features to realize the matching of the key points of the image from a region to a global environment, the proposed adaptive polarization fence methodand the constructed region analysis layer conform to the imaging characteristics of an all-sky auroral image, and the image retrieval method based on contextual depth semantic information has high retrieval accuracy and can be used for accurate retrieval of large-scale images of fisheye lens imaging.

The invention provides a soft and hard sealing barrier method for a coal mine underground oxygen-free tunneling working surface and belongs to the technical field of mining. The method involves a hard barrier system, a soft barrier system, an intelligent dynamic drainage system and a monitoring system. By combining a nitrogen curtain and an air door, a tunneling roadway is divided into six areas so that gas cannot diffuse outwards, a bypass is divided into three areas so that external air cannot enter the working surface, and accordingly the oxygen-free tunneling roadway is achieved. According to the technology, mixing of the air and the gas is avoided radically and effectively, the gas explosion accident in the tunneling roadway is prevented, the safety of the tunneling working surface is guaranteed, the utilization rate of the gas is increased, and the tunneling efficiency is improved.

The invention belongs to the field of environmental geotechnical engineering, and particularly relates to a gas barrier arrangement structure and barrier method used in a landfill. The barrier arrangement structure comprises gas extraction wells and gas injection wells; and a plurality of gas extraction wells are located in a first straight line, the gas injection wells are located in a second straight line, and the first straight line and the second line are far away from a cleaning area in sequence. The barrier method includes the steps of arranging the gas extraction wells and the gas injection wells on a garbage heap outside the cleaning area; and injecting air into the garbage heap by utilizing the gas injection wells, sucking the injected air and methane in the cleaning area into thegas extraction wells through the gas extraction wells, and performing a chemical reaction on oxygen in the air and the methane to reduce the methane in the cleaning area. The gas barrier arrangementstructure and gas barrier method provided by the invention have the characteristics of a simple construction process, short consumed time, low costs and easy maintenance.