指派矩阵同解改造理论变换定理论证

本文对指派问题的“周良泽算法”赖以成立而又尚未具体证明的一个重要的基础性定理，给出了严谨的论证，对指派矩阵同解改造理论作了抬遗补证的工作。     

Microbial liquefaction of lignite pretreated with dilute acid at elevated temperature and pressure

Two microbial cultures—ML-13 (aCandida sp.) and LSC (a fungal isolate from the University of Arkansas)—have been employed in the direct liquefaction of Louisiana lignite. Lignite samples were pretreated with nitric acid and microbial culture broths at elevated temperatures and pressures. Subsequent treatment with active cultures and culture derivatives resulted in significant solubilization of the lignite. Up to 50% liquefaction of pretreated coal (20% HNO₃ at ambient temperature and pressure) was observed in 4 d with ML-13 cultures, whereas almost 80% liquefaction occurred in a similar time period when exposing pretreated lignite to an autoclaved, cell-free culture broth.     

煤的超临界醇萃取脱硫：Ⅲ.形态硫的变化

本文分别应用Ｍｏｓｓｂａｕｅｒ谱和ＸＰＳ（Ｘ射线光电子能谱）技术考察不同反应 条件下固体产物中的无机硫和有机硫的形态变化，结果表明；在超临界醇萃取脱硫过程中，黄铁矿硫的转化反应如下：ＦｅＳ２－ＦｅＳ＋Ｆｅ１－ｘＳ，，转化的数量和深度主要取决于反应温度。２７５℃时磁黄铁矿（Ｆｅ１－ｘＳ）形式为ＦｅＳ１．１０１，４５０℃时为ＦｅＳ１．０８５；有机硫基团中ＰｈＳＨ ，Ｐｈ２Ｓ和四氢噻吩较易脱除，Ｐｈ２Ｓ     

Determination of Phenols and Cresols in Urine by Gas Chromatography

Abstract

A rapid, simple, and sensitive method was developed for the determination of three cresol isomers and phenol in urine. The sample was spiked with m-chlorophenol, as internal standard, and hydrolyzed with sulfuric acid at ambient temperature. The hydrolyzed solution was saturated with ammonium sulfate and extracted with ethyl acetate. The extract was injected without derivatization into a gas chromatograph fitted with a flame ionization detector and a glass column packed with 0.1% SP 1000 on Carbopack C. All four analytes, which eluted within 13 minutes, were quantified from standard curves.

The method was evaluated by analysis of spiked urine pools from laboratory workers and samples of urine from workers in a coal gasification plant.     

烟煤与重质油共处理的研究

煤与重质油的共处理是最有希望实现“由煤制油”的第三代煤液化新工艺之一。我国目前炼油厂每年有四、五千万吨石油渣油产出,只有一小部分用作制氢或合成气的生产原料以及生产沥青或石油焦,其余大部分用于工业燃料［１］。如将减压渣油与煤进行共处理,共同提质,提高其...     

岩相因子对煤的燃烧特性的预测

为了研究显微组分对煤及焦的燃烧特性的影响，从显微组分和煤阶的角度描述反应性能的变化。本文提出考虑显微组分和煤阶的岩相因子，较好的表示煤的类型和煤化程度对燃烧特性的影响，较前人孤立地看待显微组分和煤阶的影响量大进步。用岩相因子一煤的着火关，取得比较满意的结果。     

淮南市植物区系特征与大通煤矿废弃矿区植被状况的比较分析

对安徽淮南大通煤矿废弃矿区植被和淮南市矿区临近的植被进行调查分析,大通废弃矿区有维管植物235种,淮南市有维管植物361种.废弃矿区不同的环境有不同的植被类型,植物物种分布具有广域性,以温带分布属为主,热带分布和世界广布属占有重要地位,东亚和北美间断分布属、旧世界温带分布属、东亚分布属起到补充作用.人工引种的植物在城市和周边区域起到重要作用,在矿区生态恢复中适当引入外地物种.     

变频技术在煤矿的应用及节能效果研究

变频技术以其独特的优点应用于煤矿行业,可明显降低煤矿行业电耗,节约生产成本,同时也能够明显改善工况,提高生产效率。