天津滨海新区地面沉降趋势预测

在分析天津市滨海新区地面沉降概况及灾害的基础上,利用天津地面沉降监测网26年的水准测量资料,采用数据拟合和多核函数方法,研究了天津滨海地区地面沉降随时间的变化规律,对滨海地区地面沉降的趋势进行预测。结果表明地面沉降这一"缓发型"的地质灾害一旦致灾,会给经济建设带来无法挽回的巨大损失。     

基于Aki模型的张北地震序列Qc值特征研究

采用Aki尾波单次散射模型计算了张家口台的近场数字地震记录资料,分析了张北地震序列尾波Qc值随频率的衰减关系;当流逝时间为35 s时,张北地区的平均Qc值为Qc(f)=(76.8±17.6)f 0.9606±0.22,Qc值较低,在76.8±17.6范围内波动,这表明该区域目前处于低Qc值的构造活跃期,同时,主震发生后靠近震中区的这个椭球形的散射体内能量大释放已基本完成,目前该震源体正处于应力的调整过程。     

饮用水消毒副产物分析及相关研究进展

饮用水消毒副产物（DBPs）是消毒剂和一些天然有机物（NOM）反应生成的化合物,主要包括三卤甲烷（THMs）、卤代G@（HAAs）、卤代乙腈（HANs）和致诱变化舍物（MX）4类。本文针对氯、氯胺、二氧化氯、臭氧4种主要消毒方式产生的消毒副产物,讨论了有关分析技术的发展过程,从DBPs的前处理技术、分析技术等角度,介绍了DBPs研究领域近期所取得的进展,并展望了今后研究的发展方向。     

西锐整机降落伞系统设计研究

随着通航产业的蓬勃发展,轻型飞机已成为通用航空市场中非常具有发展潜力的机型,保障飞行安全对于轻型飞机的长远发展而言至关重要。弹道式整机降落伞救生系统作为飞行安全的最后一道防线,可大大提升驾驶员和乘客的旅程安全性。本文以西锐公司飞机配备的整机降落伞系统为研究对象,详细介绍了CAPS系统的设计验证、结构、工作程序、适用情况、使用条件和着陆考虑因素等方面,以期使相关专业设计人员对CAPS系统有一个较全面的认识,更好地把握整机降落伞系统的研究和发展方向。     

Changes in different organic matter fractions during conventional treatment and advanced treatment

XAD-8 resin isolation of organic matter in water was used to divide organic matter into the hydrophobic and hydrophilic fractions. A pilot plant was used to investigate the change in both fractions during conventional and advanced treatment processes. The treatment of hydrophobic organics (HPO), rather than hydrophilic organicas (HPI), should carry greater emphasis due to HPO’s higher trihalomethane formation potential (THMFP) and haloacetic acid formation potential (HAAFP). The removal of hydrophobic matter and its transmission into hydrophilic matter reduced ultimate DBP yield during the disinfection process. The results showed that sand filtration, ozonation, and biological activated carbon (BAC) filtration had distinct influences on the removal of both organic fractions. Additionally, the combination of processes changed the organic fraction proportions present during treatment. The use of ozonation and BAC maximized organic matter removal e ciency, especially for the hydrophobic fraction. In sum, the combination of pre-ozonation, conventional treatment, and O3-BAC removed 48% of dissolved organic carbon (DOC), 60% of HPO, 30% of HPI, 63% of THMFP, and 85% of HAAFP. The use of conventional treatment and O3-BAC without pre-ozonation had a comparable performance, removing 51% of DOC, 56% of HPO, 45% of HPI, 61% of THMFP, and 72% of HAAFP. The e ectiveness of this analysis method indicated that resin isolation and fractionation should be standardized as an applicable test to help assess water treatment process e ciency.     

V系列转基因银中杨(Salix alba var Tristis)与非转基因组长势差异的初步分析

经对鄂尔多斯市达拉特旗树林召镇的转基因试验林中的v系列转基因银中杨与非转基因对照组的生长性状的对比研究证明:该转基因系列具有较强的环境适应性,生长状况明显优于非转基因杨树。     

包钢中水水质特性分析及其在高炉循环水系统的应用研究

通过现场测试对包钢中水水质类型及其用于高炉循环冷却系统的现状进行了调查研究。确定了在现有条件下4#高炉循环冷却水系统的水质类型为腐蚀为主,兼有结垢;包钢中水为微量结垢和腐蚀型水质,随着浓缩倍数的增加逐步转化为严重结垢型水质。     

顶空气相色谱法测定水中三氯甲烷四氯化碳的参数优化及测定影响因素探讨

本文探讨了如何提高顶空气相色谱法测定三氯甲烷及四氯化碳的灵敏度、精密度与准确度。重点讨论了平衡条件的优化以及带顶空自动进器的气相色谱仪的各个关键参数的优化。     

谈《内蒙古自治区环境保护志》资料收集的经验

环境保护是我国的一项基本国策,给子孙留下一片蓝天绿地是我们环保人的责任,我们用事实记录了自治区环境保护工作的历程。     

Global warming potential of emissions from rice paddies in Northeastern China

In this study, paddy fields in Jilin province which are flooded parcel of arable lands used for growing rice (Oryza sativa Linn.) were selected as the object. Long-term exploitation of paddy fields led to variations of soil organic carbon (SOC) and green house gases (GHGs) emissions which might contribute to global warming. In order to calculate the amount of global warming potentials (GWPs) of emissions from ricepaddies and find the correlations among rice yield, SOC storage and GWP, DeNitrification-DeComposition (DNDC) model was used to simulate SOC densities and fluxes of main GHGs emitted from paddy fields. After verification, simulation results were used to calculate SOC storages and 100-year GWPs from 1949 to 2009. Results indicated that SOC densities in depths of 0–10 cm, 10–20 cm and 20–30 cm all kept increasing. Average methane (CH₄) and nitrous oxide (N₂O) fluxes were 278.55 kg carbon (kgC) ha⁻¹ a⁻¹ and 2.22 kg nitrogen (kgN) ha⁻¹ a⁻¹. The SOC storage (0–30 cm) had increased from 3.96 × 10⁹kgC in 1949 to 47.85 × 10⁹kgC in 2009. In addition, GWP emission was increasing exponentially in the past 61 years, from 0.16 × 10⁶ Mg carbon dioxide equivalents (CO₂-equivalents) to 66.36 × 10⁶ Mg CO₂-equivalents. Both SOC storage and GWP presented obviously linear relation to rice yields. Overall, the research suggested that long-term rice yields could be used to estimate the SOC storage and GWP variations.