Search

From the opening of the silo to the end of its feeding, the silage face undergoes materials and energy flow with the external environment. Oxygen is the cause of the deterioration of silage quality. It promotes a series of aerobic microorganisms to eat high-nutrient substances (such as water-soluble sugars and lactic acid), which leads to a decrease in the dry matter and energy content of the silage, and may even result in the production of mycotoxins. The silage face is susceptible to oxidation, but effective management of the silage face can help preserve more nutrients for ruminants. The paper introduces the structural characteristics of silage, gas exchange, volatilization of fermentation ends, and microbial activities that occur on the silage face. It also describes the conditions that lead to aerobic deterioration on the silage face. Additionally, the paper reviews the role of silage face management, such as management principles, daily removal rate, silage remover, and feeding principles, in ensuring personnel safety, preserving nutrients and reducing dry matter losses, to provide a reference for implementing effective feed-out practices. [ABSTRACT FROM AUTHOR]

In the paper, PSO algorithm is used to solve the assembly sequence planning problem. According to the analysis and extraction of fixture assembly information, a complete and correct fixture assembly model is established in which PSO algorithm is introduced, including assembly direction matrix, interference matrix, sequence-relation matrix, etc. Taking shorten the assembly time as the optimization goal, the feasible assembly sequences for specific fixture are obtained using PSO algorithm and the optimal assembly sequence is found. The influence of main factors on PSO algorithm is analyzed. With the increase of population, the chance to find the optimal solution increases. When ω and c 1 increase and c 2 decreases, it is good for global searches of the PSO algorithm. When ω and c 1 decrease, and c 2 increases, it is good for local searches of the PSO algorithm. In practical applications, the factors should be adjusted according to specific problems. [ABSTRACT FROM AUTHOR]

Since the bearing impact faults exhibit the non-stationary characteristics, the diagnostic method of time-frequency distribution is perhaps possessed of advantage. Based on Wigner-Ville cross-term distribution properties of amplitude modulation signal, this paper presents an approach of cross-terms false spectral energy to diagnose machinery faults, and the transmission band core function was designed to extract the cross-terms false spectral energy. Finally, the impact experimental data of bearing was given to show the approach availability. [ABSTRACT FROM AUTHOR]