We would like to start with a quote from the Taiga Forum 1 , although we all know that their statements are intended to be provocative and exaggerated:"E-books and e-book readers will be ubiquitous. Standards will have magically made this possible. Hand helds will be ubiquitous and library resources will need to be accessible to these devices to meet user needs."Technological advances bring new challenges for libraries. However, we should not consider this situation a threat nor see it as a new workload, but should view it as an opportunity to adapt the library to the new demands of our users. The 'quick response' (QR) codes are one of the tools that could help us to improve the relationship between the library and its users. It is important to understand what they can do and when they can help our users. Serials -24(3) supplement, November 2011 David Pons et al QR codes in use at the UPV Library S47QR codes in use: the experience at the UPV Library QR codes are beginning to be introduced in our libraries and are an easy way to give additional information to mobile web users in a given time and place.In this paper, we share the experience and give some examples of the introduction and use of QR codes at the Universitat Politècnica de València (UPV) Libraries in Spain. We describe how we use QR codes to give access to our mobile website, to download documents and to promote our literature blog. We also describe how we promote our QR codes to both users and librarians, including some best practices. Finally, we discuss our future projects, such as the use of QR codes for information literacy. DAVID PONS, Technical Specialist in Archives and S48 Advantages of QR codesNormal barcodes hold information in only one dimension (horizontally) and are seriously limited in the amount of data they can contain. However, QR codes can hold much more information than a regular barcode. Denso Wave developed QR codes as a way of holding information in two dimensions (they go horizontally and vertically) and, strictly speaking, they should be described as matrix codes rather than barcodes. Walsh 2 defines a QR code as being like a type of two-dimensional barcode that is readable by QR barcode readers and mobile phone cameras.The code consists of black modules arranged in a square pattern on a white background and it was designed to allow its contents to be decoded at high speed. It is really easy to generate and use them, and there are many free QR code generators and QR code readers available on the internet. Spread of QR codesQR codes are really common in Japan, but their popularity is rapidly increasing in other regions such as Europe. Although initially they were used for tracking parts in vehicle manufacturing, QR codes are now used in a much broader context. They can be used to link to a website, to download documents, to encode text or contact details, to show a location, to send SMS or to make a phone call. There are a lot of applications available which you can take advantage of in your library.The use of smartphones and ...

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Steel structures are severely affected by the extreme temperatures reached during a fire. After this, if the structure has not collapsed, the remaining elements can be reused if they are not excessively distorted or the material is still fit for service. In the last case, residual properties of steel must be adequate and fulfil the requirements of the current standards. On this matter, it is hypothesized that residual behaviour of steel not only depends on the highest temperature reached during the fire episode, but also on the load it was simultaneously bearing. This work is focused on an experimental study on the post‐fire behaviour of structural steels. Specimens were cut from structural steel (S355) cold‐formed circular hollow sections (CHS) and subjected to a combination of tensile stress and high temperature. Afterwards, the specimens were cooled in air back to room temperature and, finally, load was increased until specimen failure. The obtained results allowed discussing on the residual yield strength, ultimate strength and stiffness of the steel, and a special focus was put on the residual ductility. The results of this work can provide a basis to the appraisal of steel structures after fire, supporting the further decision on its reinstatement or subsequent demolition.

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