Search

For industrial flotation foam image processing, accurate bubble size measurement and feature extraction are very important to optimize the flotation process and to improve the recovery of mineral resources. This paper presents an improved algorithm to investigate mineral flotation foam image segmentation for mineral processing. Several libraries implemented for the Python programming language are used for image enhancement and compensation, quantitative analysis of factors influencing the image segmentation accuracy, and suggestions for improvement of the flotation foam image processing. The bubble characteristics-size and morphology-and the influence of the flotation conditions on the flotation foam image are analyzed. A Python implementation of the Retinex image compensation method-region-adaptive and multiscale-is proposed to address known issues of uneven illumination and shadows affecting flotation foam images, thereby improving brightness uniformity. Finally, an improved version of the watershed segmentation algorithm included in the Python Open Source Computer Vision library is used for segmentation analysis. The accuracy of the flotation foam image segmentation is 3.3% higher than for the standard watershed algorithm and the segmentation time is 9.9% shorter. [ABSTRACT FROM AUTHOR]

Grinding is an important link in the process of mineral processing. It plays a vital role in mineral processing by optimizing the grinding process, improving the quality of grinding products and ensuring the follow-up operation indicators. In this paper, the Python language, intelligent theoretical control technology and mineral processing were combined to solve the problem of ore feeding control in mineral processing. Using error factor analysis, an extended control algorithm was designed. The NumPy library and data collected from the Yuan YangMou concentrator in China were used to quantitatively analyze the factors affecting the error of electronic belt scales. This paper introduces the use of Kalman filtering for electronic belt scale weight data to reduce the effect of noise and hence reduce errors. The factors affecting the process of mill feeding are also analyzed. The core ideas and methods of fuzzy control theory are summarized, and a Python-based fuzzy controller suitable for the mill feeding process that improves the overall robustness and accuracy of feeding system is implemented. [ABSTRACT FROM AUTHOR]

An antenna operating at Ku-band for high-power microwave (HPM) applications is presented in this article. The antenna can realize directional radiation of the coaxial transverse electromagnetic (TEM) mode and form a pencil beam in the desired direction. The antenna contains two parts: a radial-line continuous transverse stub antenna (RL-CTSA) as a feed antenna and two transmit-array (T-A) lenses. The RL-CTSA is designed to be a standing wave antenna, and the CTSA is step sized and arranged concentrically on the antenna aperture. The T-A lens consists of numerous elliptical-hole elements and can achieve a full transmission phase of 360° by rotating the elliptical-hole elements. An antenna prototype operating at 14.25 GHz has been designed and fabricated with an aperture radius of 300 mm. The experimental results show that the antenna has a gain of 37.9 dBi with a 21° deflection in elevation plane. The aperture efficiency reaches 75.1%, the reflectance is below −20 dB, and the radiation efficiency is more than 94.0%. Furthermore, high-power tests indicate that the power handling capacity of the antenna is higher than 250 MW. [ABSTRACT FROM AUTHOR]

Overmoded relativistic backward wave oscillators (RBWOs) are usually difficult to achieve pure mode ouHowever, until now, radiation equipments for high power microwave (HPM) devices are only matched to a single operating mode. So it is unsuitable to utilize the ready-made HPM antenna to radiate mixed \textTM0{n} modes with high radiation efficiency, and thus practical applications of the overmoded RBWO device becomes limited. For converting these hybrid \textTM0{n} modes into a pure one (e.g., \textTM01 or TEM mode), diagnostics of the overmoded RBWO's output mode is required. In this letter, a practical measurement technique without requiring high precision calibrations of the power distribution and relative phases between the \textTM0{n} modes propagating in overmoded waveguide is described. This method is validated by measuring the output modes of a specially designed \textTM01\!-\!\textTM0{n} mixed modes exciter. [ABSTRACT FROM PUBLISHER]

Plasma is a non-ignorable factor in a high power generator. In this paper, plasma bombardments in the diode region are found in experiment on a Ka-band transit-time oscillator. Microcosmic and energy dispersive analysis has been done first on the plasma spots. Based on the Carbon contents in different areas of the diode, a physical model describing the progress of the plasma from appearance to expansion is built. Subsequently, simulations on the plasma expansion have been done with particle-in-cell code calculation. The result agrees well with the model proposed above. Finally, a special structure is adopted in the improved Ka-band coaxial TTO to suppress or even avoid the plasma Bombardment. The study is of significance to generators for long-pulsed and repetition operation. [ABSTRACT FROM AUTHOR]