成渝国家科技创新中心建设模式与政策研究

建设成渝国家科技创新中心,对于充分发挥成渝地区科技创新资源优势、形成西部高质量发展增长极、带动西部区域创新驱动发展、支撑国家长远发展战略等具有重要意义。文章主要研究了成渝国家科技创新中心建设的模式,提出了以&quot;一中心+多科学城+众产业基地（创新园区）+数科创大走廊&quot;为主体构架的独特创新组织体系与建设模式,并阐述了该建设模式的内涵。提出了建设现代科技治理体系、经费支持、重大科技基础设施与创新平台建设、创新主体与人才集聚、科技成果转移转化激励、创新生态与营商环境建设等推动成渝国家科技创新中心建设的政策体系建议。</p

Continuous analysis of dissolved reactive iron at fixed-point of Yellow Sea coast

Iron (Fe) is an essential micronutrient for the growth of marine phytoplankton and a key factor to affect marine primary productivity. Dissolved reactive iron (DRFe), one of the main components of dissolved Fe, is closely related to the absorption of marine organisms. In this paper, the variation characteristics of DRFe concentration at high tide and low tide were studied by continuous monitoring at Yellow Sea coast for 30 days. The effect of tidal action on DRFe concentration was analyzed, and the relationship between DRFe concentration and physicochemical parameters of seawater was further discussed. This study showed that the DRFe concentration at high tide was slightly higher than that at low tide, with a maximum concentration difference of 2.32 nmol/L and a minimum concentration difference of 0.44 nmol/L. The monthly variation of DRFe concentration was not significant in May, ranging from 4.06 to 8.34 nmol/L, with an average concentration of 5.70 nmol/L. DRFe concentrations were higher at the beginning of the month and then gradually declined. The increase of seawater temperature will promote the growth of phytoplankton and increase of chlorophyll a content, which will accelerate the consumption of DRFe

黄土塬区不同土地利用方式土壤水分消耗与补给变化 特征

对黄土塬区不同土地利用方式下 2012 年 3&mdash;10 月 7 龄果园(挂果初期)、17 龄果园(盛果期)、小麦地、玉米地土壤水文状 况进行分析，结果显示，0&mdash;600 cm 试验土层 7 龄果园土壤贮水量最高，其次为玉米地、小麦地，17 龄果园最低，且不同土地利用 方式下贮水量随着降水量的变化而上下波动，但其变化滞后于降水。不同土地利用方式均表现为随土壤深度增加土壤含水量 变异程度减弱的特征，且其土壤剖面的水分含量变化存在季节变异。农田和 7 龄果园中不存在土壤干燥化现象，而 17 龄果园 土壤剖面存在较厚的干燥化土层，其分布深度为 320&mdash;600 cm。不同的土地利用方式的土壤水分的消耗和补充深度有较大差 异，17 龄果园消耗深度为 500 cm，补充深度为 200 cm;7 龄果园、玉米地和小麦地消耗深度分别为 200、300 cm 和 300 cm，且补充 深度均超过了测定的土壤深度，大于 600 cm。</p

Psychological resilience features of Shaanxi migrant children and its influence on their sense of security

目的探讨陕西农民工子女的心理复原力和安全感特点,及心理复原力对安全感的影响。方法选取延安市新华中学初一、初二学生857人,使用青少年心理复原力量表(HKRA)和安全感量表对其进行调查。结果流动儿童的心理复原力水平低于对照组儿童(

Effects of drying and re-watering on the photosynthesis and active oxygen metabolism of Periploca sepium seedlings

采用人工控制土壤水分试验,以80%田间持水量处理为对照,研究了3次干旱-复水处理对2年生杠柳幼苗叶片光合作用,根、茎、叶膜脂过氧化和抗氧化系统的影响.结果表明:在干旱条件下,杠柳叶片相对含水量和光合速率(Pn)显著降低,光合色素含量升高.干旱复水后,叶片相对含水量完全恢复,反映了杠柳较强的旱后修复能力;叶绿素含量和Pn均明显高于对照,表现出补偿效应,适度干旱诱导了杠柳的抗旱适应性.干旱胁迫使Pn下降,以气孔限制为主,但在中午发生了非气孔限制;幼叶、新茎和细根中的超氧阴离子产生速率升高,丙二醛含量则降低,说明这些幼嫩组织未受到氧化伤害.不同器官中SOD、CAT和POD活性及变化趋势不同,以细根的3种保护酶的反应最为灵敏,说明细根是杠柳适应干旱环境的重要器官.器官间的相互合作与协调使杠柳能有效地适应干湿交替的干旱环境