The Farasan Islands,Saudi Arabia: towards a chronology of settlement

An archaeological survey of Saudi Arabia's Farasan Islands in May 2010 recorded a broad range of sites that have not previously been documented. The survey concentrated on Greater Farasan and Segid islands, and comprised a rapid recording of sites shown to the authors by representatives of the Saudi Commission for Tourism and Antiquities. The sites were photographed, their positions logged, sketch drawings made of the principal features and surface pottery drawn and photographed. Detailed drawings were made of a stone anchor and a well with possible Ancient South Arabian carved decoration. The sites visited included settlements, wells, cemeteries and a cave. Several sites included the remains of buildings made of massive ashlar blocks, as well as others of rubble‐stone construction. Datable material at the sites points to several periods of occupation, from the early first millennium BC to early modern times. Some locations were characterised by long periods of settlement. Apart from the findings of this survey, most of the sites remain largely uninvestigated, and suggest significant potential for future research into settlement on the archipelago, as well as into past maritime activity and technology in the southern Red Sea region and beyond.     

大预应力锚索在将军崖岩画保护中的选择与应用

文章介绍了大预应力锚索在将军崖岩画保护中的选择与应用,强调了科学技术在文物保护中突出作用。     

Two Ancient Wooden Anchors from Ein Gedi, on the Dead Sea, Israel

Two ancient wooden anchors with ropes, dating to different periods, were found on the western shore of the Dead Sea. The one-armed anchor was dated by 14C to the Late Iron Age—Persian Period, and the second anchor to the Roman Period. The saline water of the Dead Sea preserved the wood and ropes, but corroded almost all the metal parts. A thin black crust of lead and a green crust of copper are the only remains of the collar of the Roman anchor. The finds were made from local tree species and were probably made locally: the one-armed anchor from Acacia, the Roman one from Christ-thorn, and both ropes of date-palm.
© 2005 The Nautical Archaeology Society     

New Evidence for the Submerged Ancient Harbour Structures at Tolmetha and Leptis Magna,Libya

Surveys carried out in 2009, during a project for the creation of three underwater archaeological parks in Libya, have allowed archaeologists both to analyse already known ancient structures and to discover new evidence about the harbour areas of the ancient cities of Tolmetha and Leptis Magna. © 2012 The Author     

Geochemical and mineralogical analysis of stone anchors from west coast of India: provenance study using thin sections,XRF and SEM-EDS

Stone anchors have been recovered along the Indian coast as a part of the maritime archaeological studies at the National Institute of Oceanography (NIO), Goa. Study of stone anchors provides clues to understand the ancient maritime trade contacts of India with other countries. These anchors resemble those found in the Mediterranean Sea, Persian Gulf and Red Sea Coast. Underwater explorations at Bet Dwarka, Dwarka, Goa, Visawada and Somnath have yielded stone anchors of widely varying shapes, sizes and weights ranging between 16 and 410 kg. Sixteen (10 Indo-Arabian, 4 Ringstone and 2 Single hole type) of the total of 269 stone anchors have been studied to determine provenance of rock through petrographic analysis using thin section studies, X-ray Fluorescence (XRF), and Scanning Electron Microscope – Energy Dispersive Spectrometer (SEM-EDS).     

Ghogha: an Indo-Arabian Trading Post in the Gulf of Khambhat (Cambay), India

The ancient port of Ghogha is situated on the western bank of the Gulf of Khambhat, which has the highest tidal range in India, and the remains of the oldest civilization. Recent marine archaeological explorations in this area yielded many stone anchors. Most are of Indo-Arab type, and only one composite anchor was reported from Ghogha. An anchor similar to those found on the Chinese coast was found at Hathab. With the stone anchors from Ghogha was found a large quantity of glazed ware, suggesting a possible date for the anchors of the 10th to 14th century AD.
© 2010 The Author     

预应力锚杆技术加固涞滩摩崖造像危岩体

在涞滩石刻区分布的危岩体严重威胁着石窟造像和游人的安全,必须进行加固处理。用石刻摩崖危岩体稳定性分析评价方法,结合工程实例介绍了预应力锚杆新技术在摩崖造像危岩体加固工程中的应用,和施工工艺技术及整治效果。预应力锚杆可以有效地提高锚杆的极限抗拔力,减少锚杆数量,从而减少对石刻岩体表面的破坏。该项目被评为优质工程。该技术可以在全国地面物保护工程中推广应用。     

Earthquakes and Tie-Rods: Assessment,Design, and Ductility Issues

The effectiveness of tie-rods is widely stressed in past earthquakes and they are still used today as reinforcement intervention, given that their use is a low-invasive and low-expensive technique. However, the earthquake design of these devices is not so simple since the main feature of a tie-rod derives from its ductility and that should be preserved as was done in the past. In this article, some considerations about static and seismic design of tie-rods are made, highlighting the main failure modes of the system. To assess seismic vulnerability of I-mode mechanism, displacement-based methods are usually used, requiring high elongation capability of the tie-rods. For this reason, an experimental campaign was carried out to define clearly the maximum elongation of tie-rods and to investigate the influence of bar length on ductility. The results have shown a good displacement capacity that decreases with the increase of steel strength. A simplified formulation, obtained from nonlinear kinematic analysis, is derived to evaluate quickly the seismic vulnerability of I-mode mechanism with tie-rods and to design this common retrofitting intervention in existing buildings.