东江流域1959-2009年气候变化及其对径流的影响

依据东江流域21个气象站1959-2009年逐年平均降雨、蒸发、日照、湿度及气温等气象要素序列,选择常用的线性倾向估计及非参数M．K等趋势分析方法,分析了东江流域近50年来气温、降水、蒸发、日照及湿度等气象要素的变化趋势。选择降雨和蒸发两个气候要素两两组合,构成未来气候变动的36种假想情景,运用改进的SCS月模型模拟计算了顺天流域年径流量的变化幅度。结果表明：在过去的50年间,流域降雨量呈不显著增长,而气温则为显著上升,其他气候要素如蒸发、日照及湿度等均呈不同程度减少趋势;关联度分析表明降雨在所有气象要素中与径流的关联度为最大,说明了在东江流域降雨是径流量变化的主要驱动因子;未来流域降雨增加,蒸发减少的气候情景模式下,径流量会有所增加,反之亦然;由降雨变化引起的流域月径流量的增幅较由蒸发变化引起的相应流量的增幅变化大。     

试述实习生的工伤事故认定及赔付

从1951年原政务院颁布《中华人民共和国劳动保险条例》始,我国的工伤保险制度几经变革与发展,然而日趋完善的背后依旧存在着诸多问题,2009年7月24日国务院法制办发布了关于修改《工伤保险     

外军皮肤防护器材化学防护性能测试与评价用标准物质研究进展

本文简迷了皮肤防护器材--化学防护服(衣)化学防护性能试验与评价用标准物质的重要性,系统地概述了外军化学防护服(衣)化学防护性能试验与评价用标准物质的研究现状,并提出了我国化学防护服(衣)防护性能试验与评价用标准物质研制过程中应注意的一些问题.     

Archimedean Copulas在降水变异概率分布特征研究中的应用——以新疆福海县为例

探究二维情况下变异不同步,也就是一个变量发生变异,而另一个变量不发生变异的情况,对Copula联合分布的影响.在气温变化的环境下,降水过程发生了显著变异,而年降水量和年总降水天数的联合分布对长期旱涝情况有重要意义.以Copula函数为基础,计算新疆福海站年降水量和年总降水天数联合分布,用传统变异分析方法进行变异分析.针...     

Blending Linz–Donawitz and Blast Furnace slags with the Kambara reactor byproduct to improve their reuse in roadworks

Journal of Material Cycles and Waste Management - The use of industrial byproducts as replacement of natural aggregates has been extensively investigated to design eco-friendly roads. One of the...     

Effects of bio-organic fertilizers on pineapple heart rot and bacterial community structure北大核心CSCD

Heart rot is a common soil-borne disease in the pineapple industry, but the situation can be alleviated by the application of bio-fertilizers with beneficial microbiomes. Clarifying the controlling mechanism of bio-organic fertilizer on the high incidence of heart rot is critical in monocultural pineapple cropping patterns. In our study, the soil of continuous cropping pineapple orchards was collected. Three types of carriers (rapeseed cake, peat soil, and coconut bran), biocontrol strains (Bacillus subtilis HL2 and Streptomyces strain HL3), and organic fertilizer (YJ) were composted into different bio-fertilizers (KC, KN, KY, LC, LN, and LY), which were used in pot experiments. The controlling effect of the bio-fertilizer was determined based on the response of pineapple heart rot and bacterial communities to different fertilizing methods. Our results revealed that the incidence of heart rot in bio-fertilizer KC was the lowest, which decreased by 20% and 13.3%, respectively, compared to HF (chemical fertilizer, 16-16-16) and YJ (organic fertilizer). The richness and diversity of soil bacterial communities in all biofertilized treatments (KC, KN, KY, LC, LN, and LY) were significantly higher than those in HF. However, the α-diversity indices of the bio-fertilizers (KC, KN, and KY) were higher than those of LC, LN, and LY, and the bacterial community composition was significantly different. The bacteria GP4, GP6, Bacillus, and Azohydromonas were enriched in KC, KN, and KY, while the relative abundance of Streptomyces increased significantly in LC, LN, and LY. Furthermore, Spearman correlation analysis showed that the relative abundance of these bacterial groups was significantly negatively correlated with the incidence of pineapple heart rot. In summary, the application of bio-organic fertilizers can decrease the incidence of pineapple heart rot by altering the soil bacterial community structure and stimulating beneficial soil microorganisms, which is important for reconstructing the ecological balance in continuous pineapple orchards. © 2022 Authors. All rights reserved.     

江苏沿海地区的相对海平面上升及其灾害性影响研究

江苏海岸是全国潮滩最集中分布区，其面积约占全国的１／４，沿海地区地势低平，相对海平面上升幅度较大，是全国少数几个受海平面上升危害最严重的地区之一。初步估算，２１世纪前半期该地区不同岸段相对海平面上升速率将可能达到４．５～９．５ｍｍ／ａ，约为同期全球平均上升速率的２～３倍。其灾害性影响主要集中在：①造成堤外潮滩湿地资源损失，相对海平面上升５０ｃｍ，因直接淹没、侵蚀加剧和淤涨减缓造成的潮滩损失面积将超过５×１０４ｈｍ２，湿地损失面积达２．４×１０４ｈｍ２；②降低海堤防御标准、危及海堤自身和受保护地区安全，相对海平面上升５０ｃｍ，该地区现有海堤防御标准将由现状５０～１００年一遇降为２０～５０年一遇；遇５０年一遇风暴高潮位，全区受潮水漫溢的海堤长度将比现状增加１７３ｋｍ以上，占海堤总长的１／４；③阻碍低洼地的洪水排泄、加剧洪涝灾害损失，相对海平面上升４０ｃｍ，苏北里下河和苏南太湖湖东两片洼地的自然排水能力将可能分别下降约２５％和２０％，若两洼地分别重现１９９１年型和１９５４年型洪水，则因海平面上升增加的受淹面积将超过４×１０４ｈｍ２     

震灾保险新制式与国内外现行制式的比较研究

本文概括分析了国外震灾保险制式的形成思路、实施准则及其局限性；指出国内大多数研究模式受传统观念的制约，只能是对国外制式的效仿和沿袭；进而介绍了一种能够有效克服一般模式弊病的新型震灾保险制式，并对其实质与科学蕴涵作了简略阐述。     

猪精液酸性N-乙酰-β-D-氨基葡萄糖苷酶的纯化及性质水

以杜洛克猪精液为材料,采用硫酸铵分级沉淀、DEAE-32阴离子交换柱层析和Sephadex G-100分子筛柱层析纯化,获得纯化倍数为27.64、比活力为1 773.25 U mg~(-1)的酸性N-乙酰-β-D-氨基葡萄糖苷酶纯酶制剂.经SDS-聚丙烯酰胺凝胶电泳法测定,纯酶两种亚基相对分子质量分别为129.13×10~3和62.24×10~3.对其酶学性质的研究结果表明,酶的等电点为5.10,最适pH值为5.5,最适温度为60℃.酶在pH 3.6~9.2、温度10℃～55 ℃的范围内较稳定.以对硝基苯-N-乙酰-β-D-氨罐葡萄糖苷(pNP-NAG)为底物,测得米氏常数K_m为0.455 mmol L~(-1),最大反应速度V_m为17.34μmol L~(-1)min~(-1),活化能为41.70 kJ mol~(-1).图8表1参15     

基于样本熵的东江月径流序列复杂性分析

基于非线性动力学参数样本熵方法,分析东江干流龙川、河源和博罗3个主要控制水文站的长序列月径流资料,研究东江干流径流序列复杂度的空间分布及动态变化特征.结果表明,东江干流月径流序列复杂度具有空间差异性,整体呈从上游到下游逐渐增加的趋势;径流序列复杂度动态变化较大并具有一定的周期性,反映出自然环境变化特别是人类活动影响导致了水文动力学系统结构变化;各站的径流滑动平均值与相应的样本熵值之间存在着反相关关系,并且径流量与相应样本熵的峰谷值之间存在较好的对应关系.