SO2浓度的概率分布类型研究

用数理统计的原理，当样本容量满足检验方法要求时，用柯尔莫哥洛夫－－斯米尔诺夫、皮尔逊、概率纸等法对绵阳市城区ＳＯ２监测值进行分布类型的统计检验。其结果ＳＯ２的时空分布类型为近似对数正态。用几何均数代表样本的平均值，例行监测时段的ＳＯ２测值与增加采样频率后的测值基本无差异。而用算术均数表示平均值时，均值则落在总体均值的置信区间外。故当样本分布类型确定后，样本的主要特征数应由分布类型确定。     

高精度热电离质谱定年及其对第四纪环境研究的意义

用高精度、高灵敏度不平衡铀系热电离质谱 (TIMS)法测定第四纪地质年龄 ,并已在古气候、古环境、古海洋、考古学以及近代活动火山作用的研究中取得了一系列重要成果。本文介绍了我们用MAT -2 62质谱仪对石笋、珊瑚进行测试并取得比较满意结果的情况。     

聚合氯化铝与水解聚丙稀酰胺复合絮凝剂JX-3的制备及室内评价试验

在无机高分子絮凝剂聚合氯化铝(PAC)中引入有机高分子水解聚丙稀酰胺(PHP),制备出一种复合絮凝剂JX-3。PAC和PHP在其中可起到电性中和及絮凝桥架的的双重作用,使絮团紧密结合,提高絮凝效果,室内评价试验表明JX-3处理含轻油污水效果优于PAC和聚丙稀酰胺(PAM)。     

降低气泡混合轻质土吸水性的试验研究北大核心CSCD

气泡混合轻质土的孔隙率高,处于地下水位以下时,随着时间的推移其部分孔隙会被水填充,使其丧失轻质特性,进而威胁到工程安全,所以研究如何降低气泡混合轻质土的吸水性很有必要。分别制备了掺入憎水剂、减水剂、早强剂和粉煤灰(内掺和外掺)的气泡混合轻质土试样,通过吸水性试验和相容性试验研究了掺入不同外加剂对于降低气泡混合轻质土吸水性的效果,并分析了外加剂与气泡混合轻质土之间的相容性问题。试验结果表明,掺入适量的憎水剂、减水剂、早强剂和粉煤灰都能降低气泡混合轻质土的吸水性,但降低效果各不相同。内掺10%的粉煤灰时降低气泡混合轻质土的吸水性效果最佳,可将气泡混合轻质土的吸水率降低4.8%,且内掺粉煤灰不仅可以降低气泡混合轻质土的吸水率,还可以在一定程度上替代水泥的作用,节省造价,在工程中具有更好的实用性。掺入减水剂后消泡现象明显,导致制备的气泡混合轻质土密度明显增大,所以掺入减水剂对于降低气泡混合轻质土的吸水性效果最差。虽然掺入适量的憎水剂和早强剂也可以降低气泡混合轻质土的吸水率,但效果有限,且也会因为相容性问题引起消泡进而造成土体密度的明显增大。     

Low-carbon technology innovation responding to climate change from the perspective of spatial spillover effects

China’s technological efforts to tackle climate change have lasted for many years. It is necessary to test the effect of these efforts with quantitative method. To be exact, whether and how China’s low-carbon technology innovation responds to climate change should be tested. Based on the 2004–2015 panel data of 30 provinces in China, we use the method of ESDA analyzing the spatial correlation of China’s low-carbon innovation technology. Furthermore, we use the spatial Durbin model empirically analyzing the spatial spillover effects. The results obtained are as follows: first, supply and demand of Chinese low-carbon innovation has some deviation in the spatial distribution. The low-carbon technology innovation as the supply factor shows the characteristics of expanding from the east to the west. Innovation in eastern China has always been the most active, but innovative activities in the middle and western China are gradually decreased. However, carbon emissions have the characteristics of moving westward, implying the change of technology demand different from technology supply. Second, China’s low-carbon innovation actively responds to the trend of climate change, indicating China’s technological efforts have paid off. However, the spatial spillover effects are not significant, showing that the efforts in each region of China still work for himself. Third, environmental regulation and market pull are important factors for low-carbon technology innovation. Among them, both supporting policy and inhibitory policy have significant impact on the local low-carbon technology innovation, but no significant spatial spillover effects. It shows that environmental policies in different regions are competitive and lack of demonstration effects. Economic growth and export as market pull have higher level of effect on low-carbon technology innovation for both local and adjacent areas. Some policy implications are proposed based on these results finally.     

长波紫外线对M13mp2噬菌体的致突变作用

以野生型大肠菌CSH50及mutM缺陷的大肠菌MF67为宿主,检测了长波紫外线（UVA）对M13mp2噬菌体单链DNAlacZα基因区域的致突变能力。结果显示,UVA照射可引起噬菌体lacZα基因区域的突变,在mutM缺陷的宿主中,UVA照射的致突变作用更明显。进一步研究了抗氧化剂甘露醇对UVA照射致突变作用的影响,结果显示,0.1mol/L的甘露醇可以部分拮抗UVA的致突变作用。说明UVA照射具有致突变作用,这种作用可能与DNA的氧化损伤有关     

Regional Disparities in China＇s Mainland at Provincial Level Between 2000 and 2005

Based on the methodology provided by Organization for Economic Co-operation and Development, we analyze regional disparities in China＇s mainland at provincial level between 2000 and 2005. It regards regional GDP growth as the joint result of contribution of a number of factors, i.e. capital productivity, capital per manpower, specialization, employment rate, active population, and population. The results show that for all provincial units, capital per manpower is a dominant contributing factor to the growth of GDP per capita during the period from 2000 to 2005 while capital productivity has quite significant negative impacts. Specialization contributes differently in different provinces. In most provincial units, employment rate and age activity have a positive impact on growth of GDP per capita, though not very significantly.     

Study on Community Diversity of Coastal Shelter Forest in Jiaonan

Evaluating the biodiversity of previous and current species in a forest community is an important task. Some methodological researches and effective applications have been carried out widely in the temperate upland zone. However, they lack related researches in coastal shelter forests. This paper attempts to analyze them for Jiaonan coastal forest communities from the following three aspects, the relationship between plant biodiversity structure and its environment, the nexus between biodivers…     

生态环境脆弱地区油气田开发生态保护措施探讨

我国许多油气田处于生态环境脆弱地区,石油开采以及油气集输、储运等工程对生态环境的影响非常突出。文章依据生态保护的原则提出了油气田开发规划、设计、施工以及施工后几个阶段应当采取的生态保护措施,同时还提出了施工结束后的一些生态恢复措施,以供借鉴。     

温度、盐度和光照对球形棕囊藻生长和产毒的影响研究

为阐明溶血毒素的生物合成机制、正确认识和评价球形棕囊藻赤潮的危害,设计了盐度、温度、光照三因素三水平正交实验,考查了不同盐度、温度、光照条件下球形棕囊藻的生长和产毒的变化,分析了盐度、温度、光照强度对球形棕囊藻生长和产毒的影响.结果显示,温度是影响球形棕囊藻生长和产毒的显著因子,盐度和光照的影响不显著.30℃时球形棕囊藻比生长速率最大,藻细胞产毒能力最强,但所能到达的藻密度最小.在盐度为22、33、40,温度为20、25、30 ℃,光照为2000、4000、5000 lx的所有实验组合中,盐度为40、温度为30℃、光照为4000 lx时球形棕囊藻细胞产毒能力最强,盐度为40、温度为30℃、光照为5000 lx时球形棕囊藻的比生长速率最大.