Stability of alpine timberline ecotone on Taibai Mountain,China

--Landscape boundaries are always indicated by thevegetation boundaries. As an ecotone between closed forest andtreeline, alpine timberline may respond to global climate changessensitively. The stability of timberline and treeline depend notonly on climate change, but also on the interaction of both sidesof the ecosystems. Three natural boundaries existing in thetimberline transitional zone are recognized (1) timberline (upperlimit of closed forest zone); (2) treeline (upper limit of treeislands zone); (3) tree-species line (upper limit of individualtree growth). Paleobotanical and sedimentary evidences suggest thatthere were several times of climate fluctuation during the Holoceneperiod in this area. The timberline of Taibai Mountain must havemoved for four times on the millennium scale. Being a stochasticoscillation boundary, treeline appears in a semi-stable conditionon the century scale. The tree-species line is even more unstable,which appears in an unstable status on the decades scale. Thecomparison of the stability within several landscape boundaries,shed light on the sensibility of these communities to variousperturbation and environmental heterogeneity, i.e., herb community is the most sensitive one, which is followed by shrubs, and forestis the most stable one. Trees and shrubs can adapt to rocky andpoor soils. On the contrary, alpine herbs are able to adapt towetter and cooler soils. Finally, under a scenario of a temperatureof 1.5-4.5℃ increase, the present timberline will be relativelystable but treeline and tree-species line will move upward.     

Emission of landfill gas in Qingdao, China

ＥｎｖｉｒｏｎｍｅｎｔａｌＳｃｉｅｎｃｅｓ，Ｂｅｉｊｉｎｇ１０００１２，Ｃｈｉｎａ）Ａｂｓｔｒａｃｔ：ＡｓｔｕｄｙｏｎｌａｎｄｆｉｌｌｇａｓｅｍｉｓｓｉｏｎｉｎＱｉｎｇｄａｏ，Ｃｈｉｎａｗａｓｃａｒｒｉｅｄｏｕｔ．Ｔｈｅｒｅｓｕｌｔｓｓｈｏｗｅｄｔｈ...     

静电除尘净化球团竖炉烟气技术研究

介绍了球团坚炉的烟尘排放特性,分析研究了影响静电除尘器工作性能的主要因素,总结了静电除尘改造工程中技术改进经验和运行管理所取得的经验。     

Problems in prenatal diagnosis of β-thalassaemia by fetal blood analysis: β-chain variant comigrating with gamma chains

This report describes a couple at risk for β thalassaemia in which one spouse was heterozygous for classical high Hb A2 β-thalassaemia while the other had the compound heterozygous state for β⁺-thalassaemia and a β-chain variant. This variant comigrates on carboxymethyl-cellulose columns (CMC) with γ-chains, indicating that globin separation on CMC columns could not have been used for fetal diagnosis. The β-chain variant migrates separately from the other globin chains on HPLC and the respective abnormal haemoglobin can be separated by isoelectrofocusing. Oligonucleotide hybridization showed that both parents were carriers of the β⁺ IVS-1, nt 6 mutation. Prenatal diagnosis was successfully accomplished by oligo-nucleotide analysis on trophoblast DNA. This case indicates that an Antenatal Service should have alternative methods to CMC columns so as to carry out prenatal diagnosis of β-thalassaemia in uncommon cases.     

TiO2/beads as a photocatalyst for the degradation of X3B azo dye

The feasibility of photocatalytic degradation of X3B azo dye by TiO2/beads photocatalyst was studied.The effects of parameters such as the amount of TiO2/beads,airflow ,as well as the concentrations of H2O2,Fe^3 ,Mg^2 and Na^ on the photocatalytic degradation of X3B azo dye were also studied.The results showed that 25mg/dm^3 X3B azo dye can be photocatalytically degraded completely by 30 min illumination with a 375W medium pressure mercury lamp.Adding a small amount of H2O2 or Fe^3 ,the efficiencies of photocatalytic degradation of X3B azo dye were increased rapidly.The mechanisms of the reaction and the role of the additives were also investigated.After 120 hours TiO2/beads showed no significant loss of the photocatalytic activity.     

First trimester diagnosis of β-thalassaemia in a twin pregnancy

This paper reports the results of first trimester prenatal diagnosis in a twin pregnancy at risk for homozygous β°−thalassaemia (β°−39 mutant). Trophoblast samples from both twins were obtained at 10 weeks gestation with a forceps guided by ultrasound. Trophoblast DNA analysis, carried out with the oligonucleotide technique, revealed that one fetus was homozygous and the other heterozygous for the β−39 mutant. This diagnosis was confirmed at 17 weeks gestation by amniocyte DNA analysis. DNA polymorphism analysis within the α-globin gene provided useful genetic markers for twin differentiation.     

浅谈火电厂烟气连续监测系统（CEM）

近几年，随着我国环境保护意识的不断提高，环境保护工作也日益加强，为了做到环境和经济持续协调发展，必须要求建设项目加强污染防治对策，加强环保管理部门的有效监督。火电厂装设烟气连续监测系统（CEM）就是对其大气污染物的排放进行连续监测，为生产运行和环保管理部门提供基础数据，本文介绍了电厂CEM系统的分析系统。     

人工快速渗滤系统处理糖蜜酒精废水的研究

本实验研究应用人工快速渗滤系统处理糖蜜酒精废水,实验结果表明,当湿干比为1∶1,配水时间4 h,处理效果最佳,负荷可达到2.13～2.94 m3/(m2·d).在进水CODCr浓度＜800 mg/L时,CODCr的去除率达到80%以上,但随着进水CODCr浓度的升高,CODCr的去除率缓慢下降,当CODCr浓度超出2 500 mg/L时,系统的生物膜降解不再发生作用,只存在简单的机械过滤作用.     

扎赉诺尔煤业公司矿井水土地处理的可行性研究

我国水资源十分紧缺，尤其是北方干旱地区，水资源严重不足。而煤炭开采又要排放大量地下水，既浪费宝贵的水资源，又污染地面水环境。扎赉诺尔煤业公司矿井水采取土地处理，年可灌溉7422hm^2土地，从实施效果看，对环境、土地、植被无害而有利。