Sample preparation and biomass determination of SRF model mixture using cryogenic milling and the adapted balance method

The biogenic fraction of a simple solid recovered fuel (SRF) mixture (80 wt% printer paper/20 wt% high density polyethylene) is analyzed with the in-house developed adapted balance method (aBM). This fairly new approach is a combination of combustion elemental analysis (CHNS) and a data reconciliation algorithm based on successive linearisation for evaluation of the analysis results. This method shows a great potential as an alternative way to determine the biomass content in SRF. However, the employed analytical technique (CHNS elemental analysis) restricts the probed sample mass to low amounts in the range of a few hundred milligrams. This requires sample comminution to small grain sizes (<200 μm) to generate representative SRF specimen. This is not easily accomplished for certain material mixtures (e.g. SRF with rubber content) by conventional means of sample size reduction.This paper presents a proof of principle investigation of the sample preparation and analysis of an SRF model mixture with the use of cryogenic impact milling (final sample comminution) and the adapted balance method (determination of biomass content). The so derived sample preparation methodology (cutting mills and cryogenic impact milling) shows a better performance in accuracy and precision for the determination of the biomass content than one solely based on cutting mills. The results for the determination of the biogenic fraction are within 1–5% of the data obtained by the reference methods, selective dissolution method (SDM) and ¹⁴C-method (¹⁴C-M).     

云南地震死亡人数定量估算

本文给出了多震区的地区性指数，并通过分析龙陵地震前的预报、警报、强烈有感前震在减轻伤亡中的作用和通海地震伤亡达到最重的实例，提出了人口户外率的概念。     

Design-based ranked set sampling using auxiliary variables

A ranked set sampling protocol is proposed when an auxiliary variable is available in addition to the target variable in sample surveys. The protocol may be practically carried out without additional sampling effort or costs. Under the suggested sampling scheme, the estimators usually adopted in surveys with auxiliary information - such as the ratio estimator or the regression estimator - display surprising theoretical properties as well as high performance in practice.     

半干法脱硫除尘装置的研究及工业性试验

石灰乳喷雾干燥法脱硫，再配上双筒旋风高效除尘装置，实现了中小型燃煤锅炉烟气脱硫、除尘双功能一步法，克服了湿法脱硫常见的二次污染的问题。同时，运行费用低廉操作方便，占地面积小，设备阻力小。     

降低汽车尾气对大气的污染

简要叙述了汽车尾气对环境的危害，阐述了LPG、CNG、LNG、清洁汽油的环保效益，以及不同种类清洁燃料的适用范围，提出改善燃油质量，使用清洁燃料，降低汽车尾气对大气的污染。     

地幔源气体的CO_2/~3He特征及其地质意义

全球范围内的洋中脊玄武岩 (MORB)玻璃及气泡具有均一的CO2 /3He比率(CO2 摩尔数与3He摩尔数之比 ) ,为 ( 2～ 7)× 1 0 9,这表明通过洋中脊体系释放的幔源气体具有基本恒定的CO2 /3He比率。地幔脱气的机理研究表明 ,MORB中的该比率反映的是初始MORB岩浆的挥发份特征 ,而气泡在MORB岩浆中的成核、生长和上升的活动过程所造成的CO2 -3He的分离是很有限的 ,这说明幔源气体具有特征的CO2 /3He比率。匈牙利潘诺尼亚盆地等一系列的研究实例表明 ,幔源气体的CO2 /3He比率特征能够可靠地估计地幔脱气的通量 ,并为大陆地区构造拉张背景下的地幔脱气研究提供了一个可靠的约束条件。     

A simple method for predicting of mass burning rates in compartment fires

ＡｓｉｍｐｌｅｍｅｔｈｏｄｆｏｒｐｒｅｄｉｃｔｉｎｇｏｆｍａｓｂｕｒｎｉｎｇｒａｔｅｓｉｎｃｏｍｐａｒｔｍｅｎｔｆｉｒｅｓＹａｎｇＬｉｚｈｏｎｇＦａｎＷｅｉｃｈｅｎｇＪｉａｎｇＦｅｎｇｈｕｉ（ＳｔａｔｅＫｅｙＬａｂｏｆＦｉｒｅＳｃｉｅｎｃｅ,ＵＳＴＣ...     

用于处理精细水煤浆燃后烟气的小型管式电除尘器的设计

水煤浆是一种煤基代油燃料 ,精细水煤浆作为水煤浆中的精品 ,在家用取暖锅炉中燃用将成为现实。本试验以管式电除尘为基础 ,模拟烟气并进行单元电除尘试验 ,通过 - 特性曲线确定管体为直径 30 mm、有效长度 2 0 cm的不锈钢管 ,电晕线为 0 .5 mm的圆形不锈钢线 ,确定二次工作电压为 7.5 k V;通过单元试验 ,确定流量为 2 5 L /min时烟尘的驱进速度为 11.16 cm /s;以试验结论为依据进行小型管式电除尘器的设计 ,在烟气排放量为 12 3m3/h,烟气浓度为1.16 g/m3时 ,需单管 5 6根 ,其外形尺寸为 2 2 .4 cm× 2 5 .6 cm× 2 0 cm,运行耗电量为 0 .2 0 k W·h。     

混煤垃圾衍生燃料制备工艺的正交试验研究

采用活塞钢模，室温下利用徐州市夹河煤和生活垃圾制备出了垃圾衍生燃料。选用L9(3^4)正交表，以落下强度和热稳定性为评价指标，考察了含水率、成型压力、煤配比和灰土含量4个主要因素、3个水平对垃圾衍生燃料制备工艺的影响。研究表明：在成型压力范围内，含水率能显著影响RDF的机械强度；各因素对RDF的热稳定性均无显著影响。试验得到的最优生产工艺参数为：成型压力75KN，含水率10％，灰土含量20％，煤配比20％。     

椭球壳体无模液压成形实验探索

对椭球壳体的整体无模胀形成形工艺进行了实验研究。实验壳体采用单曲率椭球内接多面壳体。对实验壳体的尺寸变化、变形过程中的表面应变分布、变形前后的壁厚变化规律进行了测试分析，探讨了壳体的趋球变形过程，壳体的长短轴变化趋势及塑性变形规律。实验证明，在封闭椭球壳体内塑性趋球规律仍然起作用，椭球无模液压整体成形工艺值得进一步探讨研究。