基于海量点云数据的大雁塔三维重建

古建筑三维重建已成为历史遗迹保护与修复的重要内容。为了探讨三维激光扫描数据的获取流程、数据处理方法,以三维激光扫描获取的大雁塔海量点云数据为例,研究了古建筑三维重建中点云数据获取与处理的详细过程。联合Cyclone、AutoCAD和3D-Max软件的优点构建了大雁塔真实的横面、剖面、立面模型,其中重点研究了海量点云数据在Cyclone软件中分块建模的方法。结果表明:将拼接好的大雁塔海量点云数据分块建模,不仅加快了数据处理的速度,而且符合精度要求。在点云数据拼接时采用标靶拼接和同名点拼接相结合及测站间两两拼接之后再整体拟合平差的方法,减少了拼接中的误差,使每站拼接误差都不超过3cm。在建模过程中的墙体拟合是上万个点云经过平差计算得到,精度高达2mm。最后在3D-Max软件中组合、渲染和贴图,真实地构建了大雁塔三维立体模型。为古建筑数字化存档和后期的修缮工作提供了重要的依据。     

历史文化名城的旅游形象设计与实施策略——平遥古城的案例研究

本文在对文脉分析的基础上设计了平遥古城旅游区的一级理念和二级理念、视觉形象和行为形象,提出了40景组合的平遥古城旅游资源形象。     

古铜矿遗址围岩表层有害生物的防治

铜绿山古铜矿遗址地处长江中游地区、空气湿度大、围岩表层有害生物成片生长蔓延,对遗址的长期保护造成极大威胁。对此采取了改变遗址的环境条件、喷涂消杀药品的方法,消除了围岩表层有害生物的危害。经过一年半的观察表明该方法是可行的。     

二十世纪有关纸的考古发现不能否定蔡伦发明造纸术（1）

近几十年来,我国考古工作曾先后在一些西汉遗址和墓葬中发现了若干纸状残片,于是引起国内外许多学和广大人民的关注和提出疑问。是否蔡伦前约二百年就有了纸?造纸术还是不是蔡伦发明的?新发掘的纸状物到底是个什么样?经对历次的发掘作了详细的调查研究和分析化验,结论认为：20世纪有关纸的考古发现不能否定蔡伦发明造纸术。     

青海大通县出土汉代玻璃的研究

本文共对12件玻璃样品进行化学组成分析.其中,部分样品还进行了密度测定,X 射线衍射分析和显微镜观察.此外,还对一颗黄色玻璃珠的表面层进行 SEM-EDX 分析.结果表明,该玻璃珠表面有金箔涂层.根据分析结果,青海大通县出土玻璃的基础成分可归为三类,即铅钡玻璃(Na_2O-PbO-BaO-SiO_2系统玻璃),钠钙玻璃和钾硅玻璃(K_2O-SiO_2系统)。此外,还对玻璃的来源进行了探讨.     

DNA analysis in charred grains of naked wheat from several archaeological sites in Spain

In the present work we attempt to recover endogenous ancient DNA from cereal grains preserved under different conditions: charred, partially charred and waterlogged. A total of 126 grains from naked wheat and 18 from barley from different sites on the Eastern Iberian Peninsula ranging from the beginning of agriculture in the region to the turn of the Common Era, were studied. Two different extraction protocols were used, a standard phenol–chloroform method and a silica-based DNA extraction procedure implemented for artificially charred seeds. Amplifications were directed to three markers: the large subunit of ribulose 1,5 biphosphate carboxylase (rbcL) and the microsatellite WCT12 in the chloroplast genome and the x and y subunits of the high molecular weight glutenin gene (Glu-1) in the nucleus. The first two were used to assess the preservation status of the samples, while with the third we tried to identify the wheat grains at species level. It was possible to obtain eleven positive amplifications in 8 partially charred seeds but only two amplifications of the Glu-1 gene from a single sample of the Early Bronze age were genome-specific. Different contamination sources were identified and reported. Cloning and alignment of sequenced clones showed a correspondence of the amplified fragment to modern wheat D genome haplotypes. This result suggests that the sample corresponds to hexaploid wheat (Triticum aestivum L.), thus being the first ancient DNA evidence to date for the cultivation of hexaploid wheat in the prehistoric agriculture of the Iberian Peninsula. Moreover, obtained results highlight contamination problems associated to the study of ancient archaeobotanical charred seeds suggest that the combination of a silica-based extraction method together with the amplification of specific targets is a good strategy for recovering endogenous ancient DNA from this kind of material.     

THE POETICS OF ANCIENT GREEK MEMORY AND THE HISTORICAL IMPERATIVE

This book examines Greek engagements with the past as articulations of memory formulated against the contingency of chance associated with temporality. Based on a phenomenological understanding of temporality, it identifies four memorializing strategies: continuity (tradition), regularity (exemplarity), development, and acceptance of chance. This framework serves in pursuing a twofold aim: to reconstruct the literary field of memory in fifth‐century bce Greece; and to interpret Greek historiography as a memorializing mode. The key contention advanced by this approach is that acts of memory entailed an “idea of history” that was articulated not only in historiography, but also in epinician poetry, elegy, tragedy, and oratory. The book offers a rich account of poetic conventions and contexts through which each of these genres counterbalanced contingency through the use of exemplary and traditional modes of memory. This fine analysis highlights the grip of the present on the past as a significant feature of both historiographical and nonhistoriographical genres. The essay argues that this work fills a disciplinary gap by extending the reflection on memory to a new period, Greek antiquity. The retrospective positioning of this period at the outset of Western historical thought brings Grethlein's investigation to the center of debates about memory, temporality, and the meaning history. In engaging with the book's argument, the essay suggests that historiographical memory emerged in Greece not as a first‐order encounter with time, but as a second‐order encounter with forgetting. This confrontation marked a certain separation of historiography from other memorializing genres. Whereas poetic and rhetorical memories were posited against contingency, historiography sought to retrieve those aspects of the past that may otherwise have been irretrievably lost and forgotten. In doing so, it formulated the historiographical imperative as a negation of forgetting that problematized the truth‐value of memory and the very act of remembering the past.     

关于中国古代疆域理论若干问题的再探索

本文是作者在20世纪80年代发表的有关讨论中国古代疆域的论文基础上,进一步阐述了古代中国疆域范围即古代中国统一多民族国家统一或分裂的政权所管辖疆域的观点;接着,对20世纪90年代以来有关中国疆域形成的新观点作了评述,并提出了对古代中国疆域形成、发展的阶段划分（即分期）以及规律和特征的四点认识。