文化旅游产业的融合发展及政府规制改革研究

在文化旅游领域，文化与旅游产业的融合与互动发展已成为新的趋势，产生了良好的经济效益和社会效益。以文化旅游产业融合发展为题，联系产业分工理论、产业组织理论、战略管理理论等，结合文化及旅游产业自身的特征，对文化旅游产业融合的动因、融合机制和融合背景下如何进行政府规制改革等问题进行了分析。     

Radium geochemistry in Na-Cl type groundwater in Niigata Prefecture, Japan

Radium isotopes in 23 Na-Cl type groundwater sampled mainly from deep wells in Niigata Prefecture, which is the site of the largest oil- and gas-fields in Japan, were measured along with U isotopes, chemical components and hydrogen and oxygen isotope ratios to elucidate the distribution and behavior of Ra in a brackish environment underground. Also analyzed were U and Th isotopes in 38 rock samples collected from outcrops at 17 locations. Ra-226 concentrations (8.86-1637 mBq kg⁻¹) of groundwater samples roughly correlated with total dissolved solid (TDS) concentrations and other alkaline earth contents. Their ²²⁸Ra/²²⁶Ra activity ratios (0.32-5.2) were similar to or higher than the ²³²Th/²³⁸U activity ratios (0.6-1.7) in the rocks. The most likely transport mechanism of Ra isotopes into groundwater was due to their α-recoil from the solid phase, probably from the water-rock interface where Th isotopes had accumulated, and adsorption/desorption reaction based on the increase in ²²⁶Ra contents with TDS.     

红壤坡地水土保持植物措施下柑橘林地水文生态效应

根据江西水土保持生态科技园2001～2008年不同处理措施柑橘林地径流小区的降雨产流产沙的定位观测资料及2010年土壤含水量测试数据，分析了坡面尺度水土保持植物措施下柑橘林地的产流产沙及土壤水分的特征，研究了狗牙根带状覆盖、狗牙根全园覆盖、果园清耕3种措施下的蓄水保土效应。结果表明：有草被覆盖的柑橘林小区的产流产沙量明显小于柑橘清耕小区，狗牙根带状覆盖小区减流减沙效果最好，减流率为98.21%，减沙率为99.84%。在大部分土层深度，草被带状覆盖下的土壤水分含量最高，均大于清耕措施，而全园覆盖由于植物蒸腾耗水量大水分含量反而低于带状覆盖。条带植草是防治柑橘林地水土流失的有效措施，具有明显的减流减沙效应和蓄积水分作用     

陕南地区清代霜雪灾害及分形特征研究

通过对陕南清代历史文献资料的搜集、整理和分析,研究了清代(1644-1911年)陕南霜雪灾害等级、阶段变化及不同等级灾害周期性等。统计分析显示,陕南清代发生霜雪灾害28次,平均每9.57年发生一次;霜雪灾害可划分为轻度、中度、重度三级,各占灾害总频次的21%,72%和7%;清代霜雪灾害可分为4个阶段,其中1644-1668年和1819-1868年的第1、第3阶段为灾害多发期,而1669-1818年和1869-1911年的第2、第4阶段为灾害少发期。霜雪灾害的自相似性揭示了灾害的分形性,分形结果显示陕南地区清代各等级灾害呈周期变化,且这些灾害的集中性非常强。陕南清代轻度、中度和重度霜雪灾害发生分别存在着16～18 a,7～8 a和46 a振荡周期。该地区霜雪灾害的发生主要是偏暖月的持续性降雪、积雪或由寒流引起的气温骤降造成的。初步确定陕南清代发生了两次霜雪灾害气候事件,时间在公元1649-1663年和1817-1842年。     

Seasonal fluctuations of DDTs and PCBs in zooplankton and fish of Lake Maggiore (Northern Italy)

Concentrations of DDTs and PCBs were determined in the zooplankton and in three different fish species (shad, whitefish and roach) collected seasonally during 2009 and 2010 in three sites in Lake Maggiore, a south-alpine lake that has been contaminated by DDT since 1996. As previously observed in 2008, even during 2009 DDTs concentrations were higher in zooplankton than in fish, probably due to the very unstable situation of the lake still influenced by local inputs. The situation changed in 2010, when all DDT compounds increased in fish to levels much higher than those measured in zooplankton. Biomagnification was statistically demonstrated for pp′DDE in all the three fish species, indicating a probable signal of recovery of the lake.Although with respect to total PCBs we observed that the contamination levels varied across time periods and across fish species, biomagnification was evident from zooplankton to fish both in 2009 and in 2010. As concern individual PCBs, biomagnification from zooplankton to all three fish species was significant for PCB 153 and PCB 138.     

苏南某市河流水质参数时空变异性研究

以苏南某市区320km2内的河流为研究对象,基于对高锰酸盐指数、NH3-N、TP3个主要水质参数的监测,应用地质统计学的变差函数球状模型和Kriging插值法,对河流有机污染指标、富营养化指标进行了空间插值,用以揭示其时空分布特征及变化趋势,并绘制了时空分布等值线图。结果表明,受不同区域污染物来源的差异、不同河道自身条件的差异和不同水期水生植物、入流水量、河水流动性的差异等因素的影响,研究区河流水质参数呈现出不同的时空变异特征;各水质参数污染均相当严重,尤以富营养化指标氮磷最为显著。     

Plant steroid hormones produced under Ni stress are involved in the regulation of metal uptake and oxidative stress in Brassica juncea L

Brassinosteroids (BRs) are involved in the amelioration of various biotic and abiotic stresses. With an aim to explore the role of BRs under heavy metal stress, plants of Brassica juncea L. were grown in pots. The plants were subjected to various concentrations of Nickel metal (0.0, 0.2, 0.4 and 0.6 mM) and harvested on 60th day in order to observe the expression of these hormones. The isolated BRs from the leaves of Brassica plants characterized by GC-MS include 24-Epibrassinolide (24-EBL), Castasterone, Dolicholide and Typhasterole. The effect of isolated 24-EBL was studied on Ni metal uptake and antioxidative defense system in 60 d old plants of Brassica. It was observed that 24-EBL significantly increased the activities of stress ameliorating enzymes and lowered the metal uptake in plants. This is the first report in B. juncea L. plants showing the expression of BRs under metal treatments and effect of the isolated 24-EBL on metal uptake and in oxidative stress management.     

甘肃省土壤污染防治制度构建

甘肃省土壤污染主要表现在农村面源污染、工业区城市污染以及矿区污染三个方面。究其原因，与甘肃省地理环境、社会经济发展有密切的联系；而从制度的角度看，甘肃省土壤污染只是作为全国土壤污染防治缺陷的一个缩影，有其必然性和特殊性。立足甘肃土壤污染实际情况，分析其产生的原因，最后对甘肃省土壤污染防治的制度构建提出相应建议。     

钢筋混凝土箱型高墩双向拟静力试验研究

随着高墩大跨桥梁的广泛应用,其抗震问题也越来越突出。本文主要考虑轴压比、长细比的影响,进行了6个钢筋混凝土薄壁箱型高墩缩尺模型的双向拟静力试验,以及反复荷载作用下的非线性分析。研究表明:①钢筋混凝土薄壁箱型高墩柱在多维荷载共同作用下,主要发生典型的弯曲破坏,但剪切作用也不容忽视;②墩柱的破坏受到不同方向耦合作用的显著影响,尤其是抗弯刚度小的一侧受到的影响更大,较早就出现开裂,提前进入塑性发展阶段;③非线性有限元计算的滞回曲线、骨架曲线等与试验结果基本吻合;④建立了考虑轴压比、长细比影响的钢筋混凝土薄壁箱型高墩的双向荷载—位移恢复力模型,该模型基本能够反映钢筋混凝土薄壁箱型高墩的抗震性能,可供钢筋混凝土箱型高墩柱及高墩桥梁结构的抗震设计和动力计算参考。     

4A沸石去除水中Pb2＋的研究

在静态条件下，研究了4A沸石对废水中Pb2＋的吸附性能，并探讨了影响吸附的因素。实验表明：当温度为30℃，废水pH为5～6，0．01g4A沸石对100mg／LPb2＋溶液10mL吸附20min，Pb2＋的去除率可达到99％以上。在实验研究条件下，4A沸石对Pb2＋的吸附符合Langmuir和Freundlich等温吸附方程，相关系数为0．9819和0．9998。经计算，4A沸石对Pb2＋的饱和吸附量为125mg／g。4A沸石吸附水中Pb2＋达到吸附平衡的时间较短；溶液pH值的变化对吸附效果影响不显著；温度从室温略微升高，Pb2＋的去除率略有增大。吸附在4A沸石上的Pb“可回收利用，处理后的4A沸石可以再生，且重复使用性能较好。