基于小波变换的抑制心电信号噪声方法研究

针对在采集心电信号的过程中容易产生多种多样噪声的问题,利用小波函数的多尺度多分辨分析的特性,采用小波变换分解重构的方法,选用4尺度对心电信号进行滤波处理.仿真结果表明,该方法对于50 Hz工频干扰、肌电干扰、基线漂移有较好的抑制作用,为心电信号QRS波的识别奠定了良好的基础.     

云景公司碱回收系统及其扩建改造

介绍了云景林纸股份有限公司碱回收系统的运行情况以及203年对该系统进行的优化及扩建改造情况,改造后该系统的生产能力可满足制浆与漂白系统的生产要求.     

内蒙古大千博选矿厂改扩建实践

介绍了高压辊磨试验结果、干选试验结果和选矿厂生产现状,对破碎系统、磨选系统的流程及改扩建内容进行了详细论述.改扩建后达到了设计要求的规模.     

Rebuilding the lid region from conformational and dynamic features to engineering applications of lipase in foods: Current status and future prospects

The applications of lipases in esterification, amidation, and transesterification have broadened their potential in the production of fine compounds with high cumulative values. Mostly, the catalytic triad of lipases is covered by either one or two mobile peptides called the “lid” that control the substrate channel to the catalytic center. The lid holds unique conformational allostery via interfacial activation to regulate the dynamics and catalytic functions of lipases, thereby highlighting its importance in redesigning these enzymes for industrial applications. The structural characteristic of lipase, the dynamics of lids, and the roles of lid in lipase catalysis were summarized, providing opportunities for rebuilding lid region by biotechniques (e.g., metagenomic technology and protein engineering) and enzyme immobilization. The review focused on the advantages and disadvantages of strategies rebuilding the lid region. The main shortcomings of biotechnologies on lid rebuilding were discussed such as negative effects on lipase (e.g., a decrease of activity). Additionally, the main shortcomings (e.g., enzyme desorption at high temperatre) in immobilization on hydrophobic supports via interfacial action were presented. Solutions to the mentioned problems were proposed by combinations of computational design with biotechnologies, and improvements of lipase immobilization (e.g., immobilization protocols and support design). Finally, the review provides future perspectives about designing hyperfunctional lipases as biocatalysts in the food industry based on lid conformation and dynamics.     

一起发电机进油故障的分析及处理

某电厂机组发生了一起发电机进油故障.为此,电厂对造成故障的原因进行了详细的分析,总结了造成发电机进油的几个主要因素,提出了发电机密封油系统设计、安装应注意的问题.并通过对故障发电机进油的治理以及系统改造,消除了该机组大量进油的缺陷.     

600MW火电机组湿法烟气脱硫系统GGH堵灰治理

某电厂600MW火电机组湿法烟气脱硫系统运行过程中,由于烟气换热器GGH严重堵塞,系统阻力增大,增压风机超负荷运行,为防止增压风机出现喘振、失速,不得不长期开启烟气旁路运行。经过深入现场调研,对运行数据归纳、整理,利用垢样成分分析、烟气流场分析等技术手段,逐步分析出造成GGH堵塞的原因。在组织对GGH换热元件进行有效清洗的基础上,采取了有针对性的技术措施,保证系统安全稳定运行,提高了设备可用率,极大地减少了SO2的排放量,产生良好的环保效益。     

某钢铁企业自备火电机组引风系统节能改造方案探讨

以某钢铁企业自备火力发电机组为例,分析了其引风系统的现状及存在问题,结合系统实测数据、风机串并联及变频调速的原理,提出了节能改造方案,并指出容易产生的不良改造方案及其危害性,初步预测了节能改造方案的效果,得出了引风系统改造的一些基本看法。     

济钢近几年铁前系统技术进步

为了实现炼铁系统的高效、低成本生产,济钢近几年通过实施烧结机头机尾磁力密封新技术、球团竖炉烘床改造、炉顶布料技术、活跃炉缸技术、炉型维护技术以及新型复合式冷却壁的技术开发,高炉技术经济指标明显改善,为降低生铁成本,提高市场竞争力创造了条件。     

西方国家大城市内城改造与新城规划案例分析

该文对国外内城改造和新城规划案例进行分析,可以起到人们学习国外先进的技术和经验的目的,在我国城市内城改造和新城规划中值得借鉴。     

北京旧城改造与交通发展

通过分析北京城市历史形成、北京旧城改造与交通的现状、旧城改造的典型范例,提出了北京旧城区改造与交通发展的规划方向．