瓦斯抽放条件下综放面采空区易自燃区的判定

为了掌握梁宝寺煤矿3418综放面采空区的自燃危险区域分布特征,在采空区瓦斯抽放的条件下,采用全面布点法对采空区气体和温度变化规律进行了观测,利用Matlab数据分析工具,拟合得出了该工作面采空区氧气等各主要气体浓度和温度的等值线图,并对采空区各气体浓度、温度和浮煤分布数据进行叠加,得出瓦斯抽放条件下综放面采空区易自燃区域分布范围,为采空区易自燃区域的定向防治设计提供指导。     

极化水处理装置在电厂循环冷却水系统中的应用

对循环水极化处理装置的工作原理进行了论述,并对该装置在电厂中实际应用的相关数据进行了技术和经济分析,指出循环水极化水处理装置完全可以满足火电厂循环水处理的要求,可以保证循环水系统在高浓缩倍数下安全、稳定、经济运行,具有良好的推广前景。     

Adaptive protograph-based BICM-ID relying on the RJ-MCMC algorithm: a reliable and efficient transmission solution for plasma sheath channels

For reentry communication, owing to the influence of the highly dynamic plasma sheath (PS), the parasitic modulation effect can occur and the received phase shift keying (PSK) signal constellation can be severely rotated, leading to unacceptable demodulation performance degradation. In this work, an adaptive non-coherent bit-interleaved coded modulation with iterative decoding (BICM-ID) system with binary PSK (BPSK) modulation and protograph low-density parity-check under the PS channel is proposed. The proposed protograph-based BICM-ID (P-BICM-ID) system can achieve joint processing of demodulation and decoding, where the soft information is adaptively estimated by reversible-jump Markov chain Monte Carlo (RJ-MCMC) algorithms. Simulation results indicate that compared to existing algorithms, the proposed system can adapt well to the dynamic characteristics of the PS channel and can obtain a 5 dB performance improvement at a bit error rate of 10⁻⁶.