无轨辅助运输现状及发展前景

随着现代化矿井的高产高效,井下无轨辅助运输以载重大、速度快、运输灵活等优势替代了有轨辅助运输。经过多年的发展,无轨辅助设备种类多,功能全,适应于井下各种运输需要。但在发展的同时,无轨辅助运输也存在很多不足之处。针对此现状,从设备智能化、自动化和市场规模扩大化的角度阐述了无轨辅助运输的远大发展前景,对无轨辅助运输行业的发展具有一定的借鉴作用。     

浅析小型水电站厂用电节约的优化措施

水电站厂用电指标使用综合厂用率,反映电站厂用电消耗的实际情况,可通过厂用电率合理性分析电站厂用耗电情况以及节能降耗挖潜的空间,促进厂用电的合理管理,提高电站效益。文章结合华能甘肃水电开发有限公司管控的6座小型水电站厂用电管理实践,分析了影响水电厂用电损耗的相关因素,提出了厂用电节能降耗的应对措施。     

桦褐孔菌纯化多糖体外降血糖活性研究

采用水提醇沉法得到桦褐孔菌发酵粗多糖,将粗多糖过DEAE-52纤维素柱分离纯化得到两种多糖(EIOP1、EIOP2),本文以α-葡萄糖苷酶抑制活性、正常HepG2细胞及胰岛素抵抗HepG2细胞的单位细胞葡萄糖消耗量为主要指标,探究桦褐孔菌两种纯化多糖不同浓度(10、20、40、80、160和320 μg/mL)的降血糖活性,其中α-葡萄糖苷酶抑制活性以阿卡波糖作为阳性对照,葡萄糖消耗实验以二甲双胍作为阳性对照。结果表明,EIOP1、EIOP2的α-葡萄糖苷酶抑制活性均高于阳性对照组阿卡波糖与粗多糖,IC₅₀值分别为39.18、29.87 μg/mL。EIOP1在浓度为80 μg/mL时,对HepG2细胞的葡萄糖消耗量极显著高于对照组,促进效果最好,比对照组提高了30.62%(P<0.01);EIOP2在浓度在40 μg/mL时,葡萄糖消耗量极显著高于对照组,比对照提高了75.99%(P<0.01);对胰岛素抵抗HepG2细胞的葡萄糖消耗实验发现EIOP1在浓度为40 μg/mL时,促进效果最好,比胰岛素抵抗组提高了30.00%,EIOP2在浓度为80 μg/mL时,促进效果最好,比胰岛素抵抗组提高了90.49%,高于Met组(P<0.01)。因此,桦褐孔菌纯化多糖对正常HepG2细胞和胰岛素抵抗HepG2细胞的葡萄糖消耗均具有促进作用,对α-葡萄糖苷酶的抑制活性显著高于粗多糖。     

甲巯咪唑致中国人群胰岛素自身免疫综合征的临床特点分析

目的:探讨中国人群甲巯咪唑致胰岛素自身免疫综合征（IAS）的临床特点。方法:收集1985年1月1日至2019年6月30日国内外期刊公开发表的中国人群甲巯咪唑致IAS病例文献，进行回顾性分析。结果:共统计95例甲巯咪唑致IAS患者，男性发病年龄早于女性，性别比为1∶2.31；服用甲巯咪唑30 mg/d后在1月至3月内发生IAS最多，主要在夜间及凌晨以神经性低血糖为首发症状，血糖一般在2 mmol/L以下，胰岛素浓度常≥100 mU/ L，胰岛素自身抗体（IAA）阳性。胰腺影像学无明显异常；停用甲巯咪唑，给与对症及激素治疗后，症状逐渐缓解，激素治疗与非激素治疗低血糖消失时间无明显区别。结论:甲巯咪唑致IAS是一种临床上少见的自身免疫性疾病，服药期间如出现低血糖或高血糖现象，应及时就诊和处理，正确治疗后，一般预后良好。     

我国印染助剂30年发展进程

我国助剂工业始于20世纪50年代,70年代开始发展,品种遍及漂、染、印、整,基本上满足纺织印染需要.但不论产量还是品种数量都还远远落后于工业发达国家.90年代开始,产量大幅上升,品种亦趋齐全,有些品种的研究和开发逐渐缩短了与国外的差距.随着纺织品与服装的高档化,对印染助剂质量与品种提出了更高的要求,促使国内助剂工业开发更多新产品以满足需求.     

Availability growth models and verification of power equipment

The general availability growth models for large scale complicated repairable system such as electric generating units, power station auxiliaries, and transmission and distribution installations are presented. The calculation formulas for the maintenance coefficient, mathematical expressions for general availability growth models, ways for estimating, and fitting on checking the parameters of the model are introduced. Availability growth models for electric generating units, power station auxiliaries, and transmission and distribution installations are given together with verification examples for availability growth models of 320–1000 MW nuclear power units and 1000 MW thermal power units, 200–1000 MW power station auxiliaries, and 220–500 kV transmission and distribution installations. The verification results for operation availability data show that the maintenance coefficients for electric generating units, power station auxiliaries, transmission and distribution installations conform to the power function, and general availability growth models conform to rules of availability growth tendency of power equipment.     

Exergy analysis of the diesel pre-reforming solid oxide fuel cell system with anode off-gas recycling in the SchIBZ project. Part I: Modeling and validation

Solid oxide fuel cell (SOFC) systems with anode off-gas recirculation (AGR) and diesel pre-reforming are advantageous because they can operate with the current fuel infrastructure. In the SchIBZ-project, the prototype of such a SOFC system for maritime applications has already been commissioned. In this first paper, we model the system devices to conduct an exergy analysis of this real SOFC plant and validate them with experimental values from experiments in laboratory scale. The results of our simulation agree well with the experimental values. The calculations with the validated results may be closer to the real thermodynamic behavior of such system components than previous literature.     

Recursive least squares estimation methods for a class of nonlinear systems based on non-uniform sampling

Many dynamic processes in practice have nonlinear characteristics and must be described by using nonlinear models. It remains to be a challenging problem to build the models of such nonlinear systems and to estimate their parameters. This article studies the parameter estimation problem for a class of Hammerstein-Wiener nonlinear systems based on non-uniform sampling. By means of the auxiliary model identification idea, an auxiliary model-based recursive least squares algorithm is derived for the systems. In order to enhance the computational efficiency, an auxiliary model-based hierarchical least squares algorithm is proposed by utilizing the hierarchical identification principle. The simulation results confirm the effectiveness of the proposed algorithms.     

综采工作面过辅助运输联络斜巷关键技术研究

为了提高综采工作面安全高效生产,以东滩煤矿143下04综采工作面回采过程中过142运输巷2号辅助运输联络斜巷为背景,在工程实践中主要采用了加强顶板管理、加强截割层位控制以及加强设备管理等关键技术,工作面在生产过程中未出现顶板冒落、掉顶现象,安全稳定的通过辅助运输联络斜巷穿层区域,为综采工作面安全高效的生产积累了经验。     

热电厂辅助系统集中监控方案探讨

介绍了针对小型自备热电厂实现全厂辅助系统集中监控的设想,根据热电厂各辅助系统的特点,将其划分为化水、输煤和除灰3个子系统。提出了实现该设想的PLC网络结构方案及应注意的问题。