To save content items to your account,
please confirm that you agree to abide by our usage policies.
If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account.
Find out more about saving content to .
To save content items to your Kindle, first ensure email@example.com
is added to your Approved Personal Document E-mail List under your Personal Document Settings
on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part
of your Kindle email address below.
Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations.
‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi.
‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Without rapid international action to curb greenhouse gas emissions, climate scientists have predicted catastrophic sea-level rise by 2100. Globally, archaeologists are documenting the effects of sea-level rise on coastal cultural heritage. Here, the authors model the impact of 1m, 2m and 5m sea-level rise on China's coastal archaeological sites using data from the Atlas of Chinese Cultural Relics and Shanghai City's Third National Survey of Cultural Relics. Although the resulting number of endangered sites is large, the authors argue that these represent only a fraction of those actually at risk, and they issue a call to mitigate the direct and indirect effects of rising sea levels.
Stimulated Raman-scattering-based lasers provide an effective way to achieve wavelength conversion. However, thermally induced beam degradation is a notorious obstacle to power scaling and it also limits the applicable range where high output beam quality is needed. Considerable research efforts have been devoted to developing Raman materials, with diamond being a promising candidate to acquire wavelength-versatile, high-power, and high-quality output beam owing to its excellent thermal properties, high Raman gain coefficient, and wide transmission range. The diamond Raman resonator is usually designed as an external-cavity pumped structure, which can easily eliminate the negative thermal effects of intracavity laser crystals. Diamond Raman converters also provide an approach to improve the beam quality owing to the Raman cleanup effect. This review outlines the research status of diamond Raman lasers, including beam quality optimization, Raman conversion, thermal effects, and prospects for future development directions.
The architectural connections between western Central Asia and China are not well understood. Recent investigations at the Haermodun site in central Xinjiang reveals new evidence of the influence of western Central Asia on the construction of fortifications in China during the early first millennium AD.
In this paper, a dynamic model of a seven-joints manipulator operated in a zero-g simulation system is established. The errors of the friction, the suspension force, and the flexible deformation of arms are considered. Furthermore, the unloading ratio, which can evaluate the performance of the simulation system, is presented. It can reflect the level of similarity between the system and the space environment directly and effectively. The results of experimental and theoretical analyses verify the correctness of the model. It helps us to get the joint torques when the actual space manipulator without the torque sensor operates in this system and guarantees the safety of the experiments.
This paper presents a remote interactive exhibition method, which provides users with a way to visit remote high-resolution exhibitions of real artefacts. During the visit, users can control exposure, rotation and zooming parameters of a camera to adjust display conditions. Our method avoids complex modelling or scanning tasks and has no limitation on view angles. The method has been applied in the “University Digital Museum - IPv6 upgrade Project” which funded by the MOE (Ministry of Education) of China.
Keywords:Remote Exhibition, Digital Museum, Interactive Exhibition
Characteristics (e.g. shapes, surface materials) of artefacts contain a great deal of valuable information for archaeology and art research. But real artefacts cannot be imitated or moved easily, which is inconvenient to archaeologists and artists. Therefore, it is useful to set up a remote exhibition for them. How to present artefacts remotely and interactively becomes an important issue. Nowadays, a variety of effective methods can be used to make remote exhibitions.
A 3D model-based method renders the virtual artefacts based on a 3D model, which requires 3D scanning and 3D modelling. The method can be divided into 2 types that are local rendering and remote rendering. Using the local rendering method, we download models from the server, and then render them locally. To reduce the requirements on the computing capability of the local machine, we should usually downsample models to a lower precision, which is inadequate for high precision applications. Using the remote rendering method, our client reports the information to the server; the server renders and then returns the results. In order to provide an efficient service to exhibitions, such a method typically requires powerful rendering servers. Abate et al. (2011) present the whole pipeline from the creation of a high resolution 3D model of an “Acquasantiera” to its remote rendering on the World Wide Web. The project consists of 4 high performance workstations which are very expensive. Koller et al. (2004) introduces a remote rendering system in the Digital Michelangelo Project, which have been installed by 4000 users in several months. The project was accomplished by more than 30 faculty, staff, and students in 2 years since the modelling is so complex. Such methods cannot easily be adopted in most museums due to the high price of hardware and the lack of professional IT staff.
Hydrothermal syntheses and structural characterizations of some new open framework chalcogenides are described here. Open framework sulfides are often formed with supertetrahedral clusters as the basic structural building units, but it is demonstrated here that non-cluster based open framework sulfides can also be prepared. Selenides and tellurides have a stronger tendency to form non-cluster based materials. In some cases, it is possible to make materials in which the inorganic framework consists of at least two chalcogen atoms. Such a compositional diversity makes it feasible to tune structural, electronic, and optical properties.
Email your librarian or administrator to recommend adding this to your organisation's collection.