While for larger span the pre-tensioning system is found to be uneconomical. What is Hoyer system? 744483. Culvert can be provided under roads and highways for a crossing of water, as road embankment cannot be allowed to obstruct the water flow. Current ministerial offices in the United Kingdom. Part of Springer Nature. The sides of ducts may obstruct the stretching of the reinforcement at the end remote from the jack arrangement while this part may not receive the full tension if properly not carried out. IS: 14268 1995 Hoyer's system of pretensioning can be done for beams. Constr Build Mater, 40, 650 . The method of prestressing involves pre-tensioning and post-tensioning methods only in the practical cases. Prestressing removes a number of design limitations conventional concrete places on span and load and permits the building of roofs, floors, bridges, and walls with longer unsupported spans.This allows architects and engineers to design and build lighter and shallower concrete structures without sacrificing strength. Report The aim of the paper is to describe the Hoyer system itself, and its influence on the development of pre-stressed concrete parts. Anyone you share the following link with will be able to read this content: Sorry, a shareable link is not currently available for this article. Similar to mild reinforcement, mechanical interlock and friction dominate the development of subsequent load-induced stress affecting the development length. Appendix G End Region Design Models. It is further used to assists to transfer the reaction into the concrete. Explanation: Hoyer's prestressing system involves pulling wires between two bulkheads separated at large distances to produce a larger number of beams in one alignment; the concrete is to be poured by providing . Minimum Gradeof Concrete Required in Prestressed Concrete, Maximum water-cement ratio for prestressed concrete, Minimum Cement Required for Prestressed Concrete, IS: 14268 1995 Analyze and design of sections to withstand flexure and shear. . : Schreiben von Willy Gehler an Reichsminister fr Finanzen vom 03.08.1939, 2330 (19371942), Hauptstaatsarchiv (HStA 15219): Schs. 100 B. Type of culvert Following types of culverts are generally provided: (a) RCC Pipe Culvert (b) RCC Slab on Masonry or Plain Concrete Abutment (c) RCC Box Types Culvert (d) Arch Culvert (e) Cut Stone Slab Culvert (f) Stone Masonry Scupper (g) Submersible Bridge RCC Pipe culvert The cost of a slab culvert is less if the foun, Contents [ hide ] Compass Surveying To traversing, when the compass is used for making the angular measurement, it is known as compass traversing or compass surveying In compass surveying, the compass used to determine the direction of the survey line of the framework of the traverse by measuring the angle which these lines make with the magnetic meridian. In the following figure, the box girder of a bridge is prestressed with tendons that provided outside the concrete. Swiss Patent Nr. By this method, the prestress is transferred to the concrete structure as there is bond between the tendons and concrete. Parts of Hoyers research, relevant to nowadays research projects, are going to be presented, too. Hoyer's long line method is the system used in pre-tensioning. When the level of prestressing is such that the tensile stress under service loads is. Furthermore, the role of the Dresden laboratory will be highlighted. The other systems like Freyssinet, Gifford-Udall, and Magne-Baton are post-tensioning systems and a . Beton und Eisen 39(11), 150162 (1940), UA TUD A/270. You have worked pleasantly with your experiences that makes our work simple. Share. Such type of method consists of stretching the wires at greater distance apart. 1. The various stages of the pre-tensioning operation are summarised as follows. Once the wires are stretched then they are anchored in the stretched positions against the end of concrete member with the help of wedging device. (2016). A culvert may act as a Minor bridge for traffic to pass on it. High tension steel wires of diameter varying from 5 mm to 8 mm about 12 numbers are properly arranged to form a group into a cable with a spiral spring inside. The Hoyer system is generally used for the production on large scale of pre-tensioned structural element of the structure only. Pre-tensioning Systems. English-Sinhala-English Multilingual Dictionary. The following classifications. There is a need for quality control and inspection. What is prestress tendon? What is the purpose of prestressing in the concrete? Which of the preressing systems is used? In the 1920's and 1930's, Hoyer utilized very small diameters, called piano wires, as pre-stressing steel, which had a higher strength as the ones used at that time. The C range prestressing system is designed and certified for a wide variety of applications: use of 13mm and 15mm strands of all grades (1,770 or 1,860 MPa) including galvanised strands or greased sheathed strands; prestressing units holding up to 55 strands; At the beginning of the history of pre-stressed concrete, both systems (Freyssinet and Hoyer) were tested in Dresden during the 1930s. Solution The correct option is C Hoyer system Hoyer system of pre-tensioning is used in mass production of pretensioned member by long line process. Workspace. In Post-tensioning, the tension is applied to the tendons which are located in a duct after achieving the desired strength of the concrete. 740470. The spiral spring provides the means for appropriate clearance between the wires and therefore it provides the channel which is cement grouted afterward. The holes may be kept along the longitudinal direction of the concrete member so that the cables can be placed after hardening the concrete. Construction of prestressed concrete structures sanmilan Case study on signature bridge ppt (1) varun km STRESS RIBBON BRIDGE Shivananda Roy Pelletron and van de graff generator Honey Ch Fencing kathryngraham Pre stressed & pre-cast concrete technology - ce462 Saqib Imran unit 4 domestic wiring and instruments.pptx Dinesh Peter Magniwork The rods were tensioned and anchored after hardening of the concrete. Circular Prestressing When the prestressed members are curved, in the direction of prestressing, the prestressing is called circular prestressing. Scribd is the world's largest social reading and publishing site. They are typically found in a natural flow of water and serves the purpose of abridgeor a current flow controller. Hydraulic 3. Wettstein-Boards) used steel wires with small diameters. For mass production, use long line process or Hoyer's method ; Bond is the main factor in the transfer of stress to concrete. The numbers of systems are available which are patented for the linear prestressing and with modifications to circular prestressing also. The bond of prestressing wire s in Hoyer's system can be formed by _____ a) Helical crimping b) Tangential crimping c) Circular crimping d) Diode crimping Answer: a Explanation: Bond of prestressing wires may be considerably improved by forming surface indentations an d by helical crimping of wires in Hoyer's system, strands have considerable better bond characteristics than plain wires . -Large scale production -Two bulk heads or abutments independently anchored. hoyer method of prestressing Chinese translation: .. www.lankadictionary.com is a free service Sinhala Meaning of Hoyer method of prestressing from English.Special Thanks to all Sinhala Dictionarys including Malalasekara, Kapruka, MaduraOnline, Trilingualdictionary. The section remains uncracked under service loads. HOYER SYSTEM: Hoyer system or long line method is often adopted in pre-tensioning. In the following figure, concrete. Course Hero is not sponsored or endorsed by any college or university. The nuts bear against a distribution plate provided at the end of the beam. High Tech Concrete: Where Technology and Engineering Meet pp 28102817Cite as. Open navigation menu Explanation: Hoyer's long line method is the system used in pretensioning and the other systems like Freyssinet, Gifford-Udall, . After the concrete is hardened I beam may be made first and then the cables may be placed on either side of the web. The post tensioning system was considered as economical when compared to pre tensioning system, when used for larger spans due to this reason pre tensioning system was replaced by post tensioning system, for mass production of pretensioned elements, the long line process developed by Hoyer is generally used in the factory and in this method the tendons are stretched several hundred meters apart so that a number of similar units may be cast along the same group of tensioned wires. Already in the late 1880s, there were patents for systems (f.e. Consolazio, G.R., Hamilton, H.R., Ross, B.: End region detailing of pre-tensioned concrete bridge girders. Prestressing tendons (generally of high tensile steel cables or rods) are used to provide a clamping load, which produces a compressive stress to offset the tensile stress that the concrete compression member would otherwise experience due to a bending load (see Figure 2).. What is prestress loss? Moulds are placed enclosing the wires. This has a central hole and is provided with heavy circumferential reinforcement. At the same time, the French engineer Freyssinet established a pre-stressing system that made use of thicker bars. click for more detailed Chinese translation, meaning, pronunciation and example sentences. Analyze and design of composite sections. The Hoyer system was established during the 1920's and 1930's in Germany. Within the context of both projects, the authors discover that the Technische Universitt Dresden had played an important role for the establishment of pre-stressed concrete in Germany. It is very necessary to measure the load applied with the help of jack arrangement and the extension of reinforcement so that the proper prestress in the reinforcement will be ensured. All the measurement system was set up in advance before the cutting and the strains of concrete and strands were measured during the transfer of prestressing force into a concrete specimen upon cutting. Beton und Eisen 4(25), 9495 (1948), Hauptstaatsarchiv (HStA 15762): Schs. The tendons are provided outside the member (for example in I-girders or walls) or inside the hollow space of a box girder. 1) Anchoring of tendons against the end abutments 2) Placing of jacks 3) Applying tension to the tendons 4) Casting of concrete 5) Cutting of the tendons. What is Lee Mccall system? Prestressed Concrete, What is culvert | Types of Culvert | Different Between Culverts and Bridges [2021], What is Compass surveying I Types of compass | Difference Between Prismatic Compass and Surveyors Compass [2021]. 1 using pigeaud's moment coefficients; Cyber investigation is electronic method conducted through electronic system to search and discover the online facts or information. 9. The culvert is basically suited for a road to limit water flow in a controlled way. http://www.youtube.com/watch?v=VSgB1IWr6O4 A. The Hoyer effect contributes primarily to the transfer of the initial prestressing force to the concrete thereby affecting the transfer length. (III) When the ground is a large open tract with a few isolated noticeable features. Suitable for use in pressure vessels, liquid retaining structures. During the Second World War, applications of prestressed and precast concrete increased rapidly. Introduced steel wires in concrete to make flower pots, pipes, arches and slabs. In the case of pre-tensioning method prestress, there is a compressive force in the concrete which is because of the bond between the concrete and steel wires and that is kept stretched between the buttresses. Jackson and Doehring) which can be seen as pre-stressed concrete. https://www.youtube.com/watch?v=mspVqx3vgek A.V-shaped valleys B.aretes C.cirques D.U-shaped valleys, Which of the following rocks forms as a result of underwater avalanche? Then the concrete is poured so that many structural elements can be produced in a single line and for that, the shuttering should be provided. Beton und Eisen 38(8), 141147 (1939), Lange, A.: U-Boot-Bunker in Lorient, U-Boot-Bunker in Lorient Teil B Bauverfahren. In: Proceedings of ICCH5 5th International Congress on Construction History, Chicago, pp. PubMedGoogle Scholar. While for larger span the pre tensioning system is found to be uneconomical Post tensioning system the main principle in the post tensioning system is to introduce prestress in the concrete member casted earlier and by tightening the tendons which are accommodated in the ducts which are formed while beam is casted Further system developments followed well into the 1920s, but all the systems failed because of the steel quality, and of its inherent limited strength. Introduced the concept of tightening steel tie rods in artificial stone and concrete. Willy Gehler (18761953) A German Civil Engineer and Professor between Technical Excellence and Political Entanglements in the 20th century. Translate From English into Sinhala. http://www.youtube.com/watch?v=E6sWiPAu708 A.bed load B.suspended particles C.ions in solution, What is the name for the zig-zag pattern of sand movement along a beach? (IV) When long straight lines and convenient tie lines cannot be drawn on account of obstacles. The plugs if placed in the concrete then it so not project beyond the ends of the member. After stretching the bars to the required length, they are tightened using nuts against bearing plates provided at the end sections of the member. These cylinders are then kept in proper position and then the conical plugs are being pushed into the conical holes after cables are properly tightened. Akte 15762: Versuchs- und Materialprfungsamt. Partial Pre-stressing. Which one of the following systems of prestressing is suitable for pretensioned members? Such type of method consists of stretching the wires at greater distance apart. will be cast around the ducts for placing the tendons. The data you have given is truly genuine and critical for us. Lee-Mccall system This is a system in which high tensile alloy steel bars are used as the prestressing tendons. Akte A/270: Universittsarchiv TU Dresden. Partial Pre-stressing. This comment has been removed by the author. compass surveying is suitable (I) When the survey details are required along the long narrow strips e.g, a road, railway, stream, etc, (II) When the area cannot be divided into triangles such as in towns. Electrical 4. Culvert is alike a tunnel structure carrying a stream under a road or railway. Expert Answers: Prestressing can reduce the volume of concrete required in construction, lowering the use and transportation of materials, as well as boosting durability and. 1 freyssinet system; 2 magnel-blaton system; 3 hoyer-system; 4 gifford-udall system; View Answer. German Reich. These results show that the increase of transfer length was less than half of the prestressing force increment by 28%, and this is attributed to the fact that the Hoyer effect is increased with . The diameter of the bar is between 12 and 28 mm. Ingenieurprojekt zum Bildarchiv der Philipp Holzmann AG Fachhochschule Potsdam Fachbereich Bauingenieurwesen, Potsdam (2014), Miscellaneous: Zulassung von Stahlsaitenbeton. 5 months ago. Concrete is placed surrounding the wires. The bond of prestressing wires in Hoyer's system can be formed by; Hoyer's system of pretensioning can be done for beams. Beton und Eisen 6(38), 107110 (1939), Hoyer, E.: Verfahren zur Verankerung von zu spannenden Bewehrungsdrhten bei der Herstellung von bewehrtem Beton. for any queries follow me on instagram - https://www.instagram.com/ruff01586/Method of prestressing freyssinet system magnal balton system gifford Udall . University of Florida Civil and Coastal Engineering. An anchorage zone refers to the region of the structure in which the prestress force is transferred from the prestressing steel to the concrete and distributed more widely to the member. -Large scale production -Two bulk heads or abutments independently anchored to the ground are provided several meters apart, say, 100m. within the cracking stress of concrete, it is called Limited Prestressing. In Hoyers system the projection of plugs left in concrete, Get answer to your question and much more, This set of Prestressed Concrete Structures Multiple Choice Questions & Answers (MCQs), 1. In post tensioning, the concrete units are cast by ___________, 2. Patent Nr. Higher moment of inertia (higher stiffness). Hier u.a. Moulds are placed enclosing the wires. The Hoyer effect contributes primarily to the transfer of the initial prestressing force to the concrete thereby affecting the transfer length. Related Post; QN: Repeatable entity of a crystal structure is known as. In Hoyer's system the projection of plugs left in concrete exceeds beyond _____ View this solutions from Prestressing Systems ioebooster. http://www.youtube.com/watch?v=G0ru-kLpedo A.breccia B.mudstone C.greywacke D.arkose, During which period did plants first colonize the land? You need to login to ask any Questions from chapter Prestressing-Systems of Prestressed-Concrete-Structures. Personalakte Prof. Gehler. spaces) Typical values of span-to-depth ratios in slabs are given. monowire system, C.C.L standard system, Lee-Mccall system, electrical prestressing and chemical prestressing. The required force for stretching the wires can be obtained very quickly. 1940 Magnel, G., (Belgium) Developed an anchoring system for post-tensioning, using flat wedges. Developed an anchoring system for post-tensioning, using flat wedges. Correspondence to The necessity of stiff and strong foundation can be bypassed by a simpler and cheaper option. Dilation behavior of seven-wire prestressing strandThe Hoyer effect. 1 freyssinet system; 2 magnel-blaton system; 3 hoyer-system; 4 gifford-udall system; Answer: Option 3 . In: Hordijk, D., Lukovi, M. (eds) High Tech Concrete: Where Technology and Engineering Meet. The names of a few persons involved in developing prestressed concrete are mentioned. Prestressing needs skilled technology. Akte EB/3: Hier: Niederschrift ber die Sitzung, betreffend Bemessungsgrundlagen fr vorgespannte Bauteile, am 22.09.1943. not numbered (19371942), Friedrich, E.: Stahlsaitenbeton. . be cast along the same group of tensioned wires. prestressing like Hoyer system, Magnel Blaton system, Freyssinet system and Gifford- Udall Systemu0002Lee McCall system.Losses of Prestress: Loss of prestress in pretensioned and posttesnioned members due to various causes like elastic shortage of concrete, shrinkage of concrete, creep of Obtained a patent for the manufacture of Portland cement. Therefore the prestressing force should be measured. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . The Hoyer system is generally used for the production on large scale of pre-tensioned structural element of the structure only. Learn the definition of 'Hoyer method of prestressing'. Pre-Tensioning System Hoyer system or long line method is often adopted in pre-tensioning. This arrangement will give an additional restraint against the problem of slipping of the tendons. Post-tensioning Systems. For instance, if the designer desired . During the release process of the . Different systems of prestressing like Hoyer System, Magnel System, Freyssinet system and Gifford - Udall System. The pre-compression is transmitted from steel to concrete by the anchorage device (at the end blocks). 1939, gave impetus to the various new systems devised over the years and at present. From the above systems, it is clear that the systems for pre-tensioning prestressing are different from the system used for the post-tensioning systems. Linear Prestressing When the prestressed members are straight or flat, in the direction of prestressing, the prestressing is called linear prestressing. 549556 (2015), C3: C3 - Carbon Concrete Composite e.V. At the same time, the . Accessed 11 Dec 2016, DAfStb EB 3. Pre-tensioning Systems. There are two methods of introducing prestressing to a concrete, namely pre tensioning and post tensioning.. Pre tensioning happens before the casting of the concrete. Pre-stressed Reinforcing Units. Prestressing tendons (generally of high tensile steel cables or rods) are used to provide a clamping load, which produces a compressive stress to offset the tensile stress that the concrete compression member would otherwise experience due to a bending load (see Figure 2).. What is prestress loss? Methods of Prestressing Pre-Tensioning Tendons are stretched between external anchorages before concrete is placed When concrete hardens it bonds to steel When concrete reaches the required strength the tendons are cut and the force in the tendons is transferred through bond from the steel to concrete Tendons used are primarily in the form of Bars provided with threads at the ends are inserted in the performed ducts. (in a local coordinate system) in the rebars. German Reich. The anchoring of the bars is done by screwing special threaded nuts. Post-tensioning Systems. Final Report (2013), Curbach, M., Hnseroth, T., Hensel, F., Scheerer, S., Steinbock, O.: Genius and Nazi? During the cutting of the tendons, the prestress is transferred to the concrete with elastic 2022 Springer Nature Switzerland AG. https://doi.org/10.1007/978-3-319-59471-2_319, DOI: https://doi.org/10.1007/978-3-319-59471-2_319, eBook Packages: EngineeringEngineering (R0). In other cases, there is the possibility of extension in some other part of the tendons which are overstressed. Your Membership Plan has expired.Please Choose your desired plan from My plans, The Hoyers system of prestressing proves to be economical for _______, View all Chapter and number of question available From each chapter from Prestressed-Concrete-Structures, Flexural Strength of Prestressed Sections, Anchorage Zone Stresses in Post Tensioned Members, Design of Pretensioned and Post-Tensioned Members, Prestressed Concrete Pipes, Slabs, Grid Floors, Tanks, Shell, Folded Structures, Poles and Sleepers, Planning and Economical Aspects of Prestressing, Construction, Maintenance and Rehabilitation of Prestressed Structures, This Chapter Prestressing-Systems consists of the following topics. As the transporting bigger products and handling them is practically impossible and very costly. Methods and Systems of prestressing: Pretensioning and Posttensioning methods and systems of prestressing like Hoyer system, Magnel Blaton system, Freyssinet system and Gifford- Udall SystemLee McCall system.Losses of Prestress: Loss of prestress in pretensioned and posttesnioned members due to various causes like elastic shortage of concrete, shrinkage of concrete, creep of concrete . . Prestressing bed, end abutment and mould An extension of the previous system is the Hoyer system. Some researchers (f.e. Abstract: General. Next QN: Hoyer's system of pretensioning can be done for beams. The jack arrangement used in the system are very heavy and expensive, therefore the practical difficulties are associated with it. The Hoyer system is generally used for the production on large scale of pre-tensioned structural element of the freyssijet only. The nominal maximum size of the aggregate should be as large as possible within the limits specified but in no case greater than one-fourth of the minimum thickness of the member, provided that the concrete can be placed without difficulty so as to surround all reinforcement and prestressing tendons thoroughly and fill the corners of the formwork. The shuttering is provided at the sides and between the members. Leave a Comment. Published by. best office cleaning service, Prestressing of concrete can be classified in several ways. The cables may be accommodated inside the sheaths of prestressing before the placing of concrete. Pre tensioning system. Want to read all 47 pages? For example, circumferential prestressing of tanks, silos, pipes, and similar structures. The Hoyer-System A Forgotten Pre-stressed Concrete System up to Date Again. Securing wires is not the expensive process. The end abutments are kept sufficient distance apart, and several members are cast in a single line. Eidg. The Freyssinet system of post tensioning anchorages was developed in ___________, Explanation: Freyssinet system of post tensioning anchorages which was developed in. When the prestressing is achieved by providing elements outside the concrete, it is called external prestressing. The Gifford Udall System, which originated in the United Kingdom, is widely used in India. hoyer method of prestressing translation in English - English Reverso dictionary, see also 'hoe',hover',hyper',hero', examples, definition, conjugation . 2) Gomti Aqueduct, U.P. End of preview. Oliver Steinbock . Mappe 400 (19401944), Hoyer, E.: Verfahren zum Herstellen von aufteilbaren Verbundbaukrpern. Chapter: Prestressing-Systems You need to login to ask any Questions from chapter Prestressing-Systems of Prestressed-Concrete-Structures. Two major methods of prestressing . The following ways to do it: Such methods may be adopted at the site or on the ground and then it can be hoisted to the proper position. : Edwald Hoyer 50 Jahre. OMCQ Team. Freyssinet system, Magnet Blaton system and Gifford Udall system are type of post tensioning system. The following figure shows linearly prestressed railway sleepers. 68%-(&7 $ & 7 '$7( &/$66 &,9,/ 1' <($5 7+6(0 D d,K ^ K& WK^d rd E^/KE/E' /E WZ ^dZ ^^ KE Z d & ] v u X D P v o u X > } v Z u X > rD o o u X ' ] ( ( } rh o o u X In contrast, these anchorage systems were not necessary in the Hoyer system because of the force and surface ratio of each single piano wire (known as the Hoyer effect). The prestressing force on the concrete is transferred via shear stresses over a certain length referred to as the transmission length. The central hole passing axially through the plug will permit cement grout injected in it. There is considerable difficulty occurs in the transporting of concrete members of longer than 20 m length. The Hoyer effect, due to the dilation of the strands after release, contributes to the transfer of the prestressing force. Q5. 1000 C.10,000, Which of the following is not found in an area of alpine glaciation? Most of the, applications of prestressing are internal prestressing. The transfer of large prestressing forces, particularly at an early concrete age, can lead to local cracking associated with bursting stresses or splitting associated with transfer of the strand force . Continue to share these kinds of article, Thank you. The anchorage system consists of a cylinder of good quality concrete and is provided with some corrugations on outside parts. here e.g. the post tensioning system was considered as economical when compared to pre tensioning system, when used for larger spans due to this reason pre tensioning system was replaced by post tensioning system, for mass production of pretensioned elements, the long line process developed by hoyer is generally used in the factory and in this method the The anchoring of the bars is done by screwing special threaded nuts. Please click for detailed translation, meaning, pronunciation and example sentences for hoyer method of prestressing in Chinese 2. German Patent Nr. 6. The Hoyers system of prestressing proves to be economical for ___________, Explanation: The post tensioning system was considered as economical when compared to, pre tensioning system, when used for larger spans due to this reason pre tensioning system, was replaced by post tensioning system, for mass production of pretensioned elements, the, long line process developed by Hoyer is generally used in the factory and in this method the, tendons are stretched several hundred meters apart so that a number of similar units may. Used high strength unbonded steel rods. Prestressing is the introduction of a compressive force to the concrete to counteract the stresses that will result from an applied load. hoyer method of prestressing translation in English - English Reverso dictionary, see also 'hover',hoyden',hero',hoaxer', examples, definition, conjugation System of Prestressing - Free download as PDF File (.pdf) or read online for free. (vi) When the country is billy where chaining is tedious and l. Before the development of prestressed concrete, two major developments of reinforced concrete are the invention of Portland cement and the invention of steel in concrete. This method is used to prestress steel bars. Delft University of Technology, Delft, The Netherlands, 2018 Springer International Publishing AG, Steinbock, O., Curbach, M. (2018). https://www.youtube.com/watch?v=THEXzkZUFLU A.refraction B.turbidity flows C.longshore drift, Each year, about how many earthquakes occur that are strong enough to damage property? This is the way to put space between the wires which will be filled with cement grout. 9. German Patent Nr. There is an additional cost in auxiliary equipment. Browse the use examples 'Hoyer method of prestressing' in the great English corpus. Der deutsche Baumeister 5(1), 1823 (1939), Habicht, F.R. Hoyer's system of pre tensioning is generally adopted for; The prestressing of concrete member is carried out to reduce The length of the prestressing tendon between the end of the member and the point where the steel attains its stress is called
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