不同历史时期人们对黄河流域典型旅游景观资源的开发与保护初探

在不同的历史时期,黄河流域自然和人文景观旅游文化资源的开发和保护各有侧重。先秦时期,在旅游文化资源的开发和保护方面主要奉行的是儒道朴素的顺其自然、天人合一、注重保护的理念。秦汉时期,对旅游文化资源的开发主要体现在封禅设施的建设、苑囿的建设等方面,那时还建立了相应的管理制度。魏晋南北朝至唐宋时期,佛教受到统治者的重视,因此无论是自然景观还是人文景观,在开发的过程中都被打上了佛教文化的烙印,例如泰山石刻、石窟类旅游文化景观等;另外,在开发方面,其管理制度逐步健全。明清时期,由于对黄河流域的过度开垦,黄土景观逐渐呈现。     

黄河口近岸海域大型底栖动物群落特征

为了解黄河口近岸海域大型底栖生物资源的现状和变化,本研究于2016年8月、11月和2017年5月、8月、11月进行拖网调查。对拖网获得的生物样品进行鉴定,并称重和计数,以获取物种组成、优势物种、生物量和丰度等指标数据。使用优势度计算方法和PRIMER 6.0统计软件对群落特征进行分析。结果共获得大型底栖动物109种,其中甲壳动物37种,鱼类35种,软体动物34种,棘皮动物2种,其他动物(海葵Actiniaria sp.)1种。在该区域发现优势种19种,其中甲壳动物11种,软体动物4种,鱼类4种。黄河口近海大型底栖动物总平均丰度和总平均生物量分别为0.48ind./m~2、1.44g/m~2,均是软体动物贡献率最高。丰富度指数(D)、均匀度指数(J′)和Shannon-Wiener多样性指数(H′)平均值分别为2.44±0.33、0.88±0.03、3.64±0.08。CLUSTER聚类分析和MDS标序分析表明,在40%相似性水平上,每次调查结果可以分为3—5组,各组之间差异显著。黄河口近海大型底栖动物以小个体的甲壳动物、软体动物及低经济价值的鱼类为主,底栖物种有小型化趋势。黄河口近海底栖群落结构差异较大,总体受污染扰动情况明显。     

黄河中下游灾害系统的脆性源控制

将复杂系统的脆性理论引用到黄河灾害的研究。量化了复杂系统脆性的定义和特性,并基于复杂系统的脆性特征,运用系统动力学原理对黄河中下游的自然灾害进行系统的分析,建立了自然灾害系统的链锁式反应机制模型。在此基础上,结合黄河中下游的现状,提出了工程和非工程的灾害预防控制措施。     

The role of insulin and IGF-1 signaling in longevity

There are many theories of aging and parameters that influence lifespan, including genetic instability, telomerase activity and oxidative stress. The role of caloric restriction, metabolism and insulin and insulin-like growth factor-1 signaling in the process of aging is especially well conserved throughout evolution. These latter factors interact with each other, the former factors and histone deacetylases of the SIR family in a complex interaction to influence lifespan.Received 8 July 2004; received after revision 25 August 2004; accepted 17 September 2004     

黄河三角洲可持续发展定量评价

根据“压力-状态-响应”概念模型制定了区域可持续发展评估指标体系,对黄河三角洲五县区的可持续发展水平进行了定量评价,划分出了可持续发展高水平区、中水平区和低水平区,并分析了三类型区的可持续发展特征．     

Geothermal field and thermotectonic evolution in Southern South Yellow Sea Basin

Based on the available borehole temperature data and measurements of thermal conductivities on 10 core samples in the Southern South Yellow Sea Basin, 8 heat flow values are obtained. The results show that the mean values of temperature gradient and heat flow are 28.6“C/km and 69 mW/m^2, respectivdy. The thermal history reconstruction from the inversion of vitrinite reflectance data, using the temperature-gradient method, indicates that the highest paleo-heat flow occurred at the end of the Mesozoic, and then the barn began to cool to present day. Tectonic subsidence analysis shows that the basin experienced at least four episodes of quick subsidence since the late Paleozoic and that the tectonic evolution was quite strong and complex.     

黄河流域水量调度方案编制方法研究

黄河流域水量调度方案的编制是黄河流域水资源管理工作中的一个重要环节,本文在现有黄河水量调度工作的基础上,对黄河流域水量调度方案的三种编制方法进行了研究,分别是现行法、自适应法和适度优化法;说明了每一种编制方法的水量调度原则、基本原理和编制流程;并对其应用情况作了简要说明。     

Discovery of a 1.0 Ma Yellow River terrace and redating of the fourth Yellow River terrace in Lanzhou area

Based on the aeolian loess sequence-stratigraphic division and paleomagnetic datings on terraces, we found that an undiscovered terrace with the age of 1.0 Ma BP lies between the Dunwashan terrace and Wuyishan terrace. This terrace recorded an intensive Yellow River incision event during that period. Results of paleomagnetic dating and optically stimulated luminescence (OSL) dating of the Wuyishan loess section and Zaoshugou loess section on the fourth Yellow River terrace (T4) show that the age of the fourth Yellow River terrace in Lanzhou area is 0.86 Ma BP rather than the previously believed 0. 6 Ma BP. This result answers a long-term question in the ge-omorphology community of whether there exists a 0. 8 Ma terrace in Lanzhou area. The discovery of the 1. 0 Ma Yellow River terrace and redating of the age of 0.6 Ma terrace in Lanzhou area provide new insights into further research on the evolution of Yellow River.     

Magnetostratigraphy of borehole EY02-2 in the southern Yellow Sea and its paleoenvironmental significance

Various media are used for the study of paleoenvi- ronment. Among them, ice-core, loess and marine sediments are the most important for long time re- cording[1]. In all kinds of researches of paleoenviron- ment, age determination of the sediments is the m…     

多维尺度模型算法实现及其配水模型应用

介绍了多维尺度(MDS)配水模型算法的实现,并针对传统配水模型只能考虑一个变量的缺点,用多维尺度模型构造了实时动态配水模型。MDS配水模型适用于包含配水水量、用水区位置和用水区需水概率等多变量的实时动态配水,它对传统一维配水模型是一个重要的补充和发展。基于MDS的配水模型,可以实现大型流域实时动态配水,为流域的规划和管理提供参考。