Testing the standardized growth curve (SGC) to OSL dating coastal sediments from the south Bohai Sea, China

It has been suggested that the standardized growth curve (SGC) method can be used to accurately determinate equivalent dose (D_e) and reduce measurement time. However, different opinions regarding the applicability of the SGC method exist. In this paper, we evaluated quartz OSL SGCs of marine and coastal sediments of different grain sizes and different cores in the south Bohai Sea in China, and tested their applicability to the determination of D_e values. Our results suggested as follows: (1) The SGC method is applicable to both multiple- and single-aliquot regenerative-dose (MAR and SAR) protocols of OSL dating and efficiently provides reliable estimates of D_e. (2) Finesand quartz of different palaeodoses showed highly similar dose-response curves and an SGC was developed, but old samples using the SGC method have large uncertainties. (3) For coarse-silt quartz, two different types of dose-response curves were recorded: low-dose (≤60Gy) and high-dose (≥100Gy). The growth curves of low-dose quartz were similar to each other, facilitating the use of SGC in D_e estimations, but errors tended to be larger than those obtained in the SAR method. For high-dose (100–300Gy) quartz, the SGC was also found to be reliable, but there was large uncertainty in D_e (>300Gy) estimation. We suggest that SGC could be employed for the dating of marine and coastal sediments dating using either MAR or SAR OSL protocol and either fine-silt, coarse-silt or fine-sand quartz.     

学术著作翻译的几个问题——以汉译《草原帝国》为例

以汉译《草原帝国》为例 ,学术翻译应注意以下几个问题 :诠释性学术著作的时效性 ;学术著作的思想倾向 ;学术著作翻译应遵循专业的学术规范 ,包括人名、地名和专业术语的翻译 ;学术翻译的语言 ,要在于确切 ,同时也要合乎汉语习惯     

“坎曼尔诗签”真乎,伪乎?

我国新疆出土于唐代元和年间的“坎曼尔诗签” ,在70年代初期于北京展出后 ,学术界引起很大震动 ,但也产生了一些不同观点的争论。本文围绕“诗签”的真伪问题 ,对主要观点作了述评     

宁夏移民安置区剩余劳动力状态分析

农村剩余劳动力转移是当前社会各界共同关注的问题。本文就宁夏移民安置区这一特殊区域的剩余劳动力产生的背景状态、自身资源状态、输出人员的结构状态及目前的转移状态进行了分析,进而研究了影响移民区剩余劳动力转移的各种因素,提出了加速推进移民区剩余劳动力转移的五条对策,即重视移民区小城市与中心城镇的建设、加速非农产业的发展、加大对劳动力的技能培训、加强对劳务输出的组织与服务、加快体制和制度创新。     

近十年来中国人口迁移研究及其评价

本文对20世纪90年代以来的中国人口迁移研究进行了总结与评价。文章首先概述了近10年来中国人口迁移研究的主要特点;然后对中国人口迁移研究的主要内容即迁移人口的社会经济特征,人口迁移的空间格局,影响因素,作用,人口迁移政策建议以及人口迁移研究中的理论与方法等方面进行了总结;最后指出了人口迁移研究中存在的问题与未来应该加强研究的领域。     

西夏文Инв.No.4926号文献残卷考

西夏文Инв.No.4926号文献的照片,在《俄藏黑水城文献》第9册和第13册中分别被定名为《亥年新法》与《法条》,通过解读,实为《孙子兵法》残篇及黑水地区军事文献,书写时间当在1215年八月之前。     

导游员道德危险的防范与控制

导游员的道德危险是近年来困扰着旅行社行业的一个严重问题,本文分析其道德危险的表现形式及其产生的原因,指出其危害,并提出防范和控制导游员道德危险的建议.     

研究彝文古籍发扬彝族文化

彝文古籍是集民族学、民俗学、原始宗教学、历史学、文学、地理学、地名学、哲学、伦理学、修辞艺术等于一身的多学科书籍。通过对彝文古籍的价值进行研究,可以进一步发扬彝族文化,同时激发彝族人民的爱国主义精神,振兴中华文化。     

绿色食品生产基地农业生态环境综合评价模式构建——以苏北里下河地区为例

发展绿色食品生产是生态农业建设规划的重要组成部分。本文根据绿色食品产地环境质量标准要求,客观评价里下河地区发展绿色食品生产的环境状况,得出里下河地区具有发展绿色食品生产显著的农业生态环境优势,并且,从苏北里下河地区评判案例出发,总结出绿色食品生产基地农业生态环境综合评价模式,从模式的原理、指标的选取、具体评价方法等进行论述。为各地开展绿色食品综合评价提供模式和方法。同时从农业循环经济的原理论述绿色食品,有机食品是高效生态农业的产物。为地方政府在制定发展绿色食品生产基地建设规划时参考。     

IBEM for Impedance Functions of an Embedded Strip Foundation in a Multi-Layered Transversely Isotropic Half-Space

An indirect boundary element method (IBEM) is developed to study the dynamic impedance functions (stiffness coefficients) of a rigid strip foundation embedded in a multi-layered viscoelastic transversely isotropic (TI) half-space. The proposed IBEM using half-space Green’s functions of distributed loads as fundamental solutions have the merits of fictitious loads being directly applied on the real boundaries without the problem of singularity and of the discretization effort restricted to local boundaries. In addition, the accuracy of the proposed method is not affected by the thickness of the discrete TI layers, as the exact dynamic stiffness matrix is employed. The presented algorithm is verified via comparisons with published results for the isotropic medium. By taking a rigid strip foundation embedded in a homogeneous half-space, a single-layered half-space, and a multi-layered half-space as examples, the effects of material anisotropy, frequency of excitation, and soil layer on the impedance functions are studied in detail. Numerical results show that impedance functions for the TI medium can be significantly different from those of the isotropic case. The variation of TI parameters alters the dynamic characteristics of the TI layered site, which in turn alters the dynamic interaction between the soil and foundation. In addition, the soil sedimentary sequence also has a remarkable influence on the impedance functions.