健美操教学对不同体型、性别大学生身体自尊影响的探究

身体自尊水平会直接影响到个体对自己的评价,通过健美操教学可以提高身体自尊的水平,从而保障个体自身的心理健康,促进其全面发展。本研究采用问卷调查法、实验法对被试者身体自尊水平进行测试,运用数理统计卷调查结果进行分析。结果显示：不同体型、性别在身体自尊总分、身体自我价值感、运动能力、身体状况、身体吸引力和身体素质等分维度的后测时没有显著差异;进一步交互作用分析发现,组别和性别在运动能力子维度上有显著差异,性别和体型在身体状况上有显著差异;组别和体型在健美操对学生自尊的影响上交互作用没有达到显著性。     

丛枝菌根真菌对桉树吸收Cu和Zn的作用研究

通过盆栽实验研究摩西球囊霉(G.m)对桉树幼苗吸收Cu和Zn的作用,及其对Cu/Zn交互作用的影响。桉树苗栽培在含Cu(0、10、25、50mg.kg-1)或/和Zn(0、50、100、200、300、500mg.kg-1)的模拟污染土壤中,接种G.m,8周后收获,分别测定桉树苗的生物量、菌根侵染率及Cu和Zn含量。结果表明:①根部G.m的侵染率为20%～35%,外加Cu和Zn对侵染率无显著影响。②接种G.m可使桉树苗生物量增加1～3倍;显著性降低桉树苗中Cu和Zn的含量(P<0.05),分别减少5%～40%和50%～80%。③未接种G.m时,土壤中外加的Zn使桉树苗中Cu的含量显著减少(P<0.05),而Cu对桉树苗中Zn的含量无显著影响。接种G.m后,土壤中外加的Zn亦使桉树苗中Cu的含量显著减少(P<0.05),而Cu也能显著降低桉树苗中Zn的含量(P<0.05)。     

Impact of gamma radiation and salinity on growth and K^＋/Na^＋ balance in two populations of Medicago sativa （L.） cultivar Gabbs

The perennial Medicago sativa cv. Gabes is widely grown on saline soils in Tunisian oases. Morphological and physiological analyses of two populations （Mareth and Gannouch） were conducted in order to study the effect of salinity and gamma radiation （350 Gy） interaction on two populations of this species. It has been shown that the two irradiated populations of Medicago sativa are fairly tolerant to salt at growth phase compared to the non-irradiated. Exposure to gamma irradiation （350 Gy）, alone or in combination with salt stress, increased significantly （p 〈 0.001） shoot number, stem height and chlorophyll b pigment especially for the Gannouch population, while no change occurred for the Mareth population. The presence of salt to 9 g/1 affected significantly the root biomass and induced a reduction of shoot development of both control and irradiated alfalfa populations. For all treatments, plants of two populations remained able to produce and to allocate dry matter to the different organs. The survey of Na^＋/K^＋ ratio showed that the growth of the aerial organs of two non-irradiated populations was at least determined by a selectivity in favour of the K^＋ ions （r^2 = 0.97 and r^2 = 0.59 for Mareth and Gannouch non-irradiated populations, respectively）. However, the rather weak correlation detected for the irradiated populations, particularly for the irradiated Gannouch, seems to be the consequence of the effect of irradiation that improved potassium availability, essential element for growth and development. Results also showed that the two irradiated populations, especially the Mareth, accumulated Na^＋ ions in its photosynthetic organs. This accumulation was associated with an improvement of foliar water content at a level of salinity around 5 g/1. Such a mechanism reflects probably an inclusive behaviour of the plants and a good aptitude to use the dominant ions （Na^＋） for the osmotic adjustment. However, the non-irradiated populations are unable to adjust their internal os     

烘焙对于典型厨余组分共气化特性影响研究

采取烘焙的预处理手段,以大米、菜叶及猪肉为3类典型厨余代表,分析3种典型厨余原样及烘焙样2组分混合共气化过程中合成气生成特性．实验结果表明：菜叶中碱/碱土金属元素在气化过程中具有催化作用,在共气化过程中能够促进合成气生成,烘焙预处理将进一步促进协同作用效果．大米和猪肉共气化过程加剧了半焦中多环芳香稠环形成,对气化产生抑制作用,而烘焙预处理能够改善该抑制作用．     

互联网、技术创新与经济高质量发展

采用2015—2018年我国29个省级面板数据，分析互联网、技术创新及两者的交互作用对经济高质量发展的影响。研究发现：互联网、技术创新对经济增长效率、经济增长稳定性、产业结构优化和可持续发展水平均具有促进作用，其中技术创新的促进作用更为显著，但对经济福利水平有一定的阻碍作用；互联网与技术创新的交互作用对经济高质量发展呈现显著正相关，也强化了技术创新对经济高质量发展的促进作用；人力资本对经济高质量发展各方面都起到显著的促进作用，而财政支出对经济高质量发展的影响不显著。因此，要坚持以互联网为驱动力，提高技术创新能力，更好发挥政府引导作用。