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DUCTS, AIR VENTS, VALVES .......................................................................... 2 3. (...) Structured-type ducts with reinforcing strips must be used for high-pressure systems (air speed greater than 10 m/s) and unstructured ducts for low-pressure systems (air speed less than 10 m/s). (...) Return air and extracted air ducts will not be insulated for conveyed air temperatures greater than 16 °C.
Language:English
Score: 2038921 - https://www.ungeneva.org/sites...n_Version-du-29-06-2016_EN.pdf
Data Source: un
L.73: Methods for inspecting and repairing underground plastic ducts This Recommendation describes some inspection methods to check buried duct quality, and also describes various methods that are utilized to repair underground conduits. (...) Floating techniques for installation of fibre-optic cables L.57: Air-assisted installation of fibre-optic cables This Recommendation describes air-assisted methods for installing fibre-optic cables in ducts. (...) L.77: Installation of fibre-optic cables in sewer ducts This Recommendation describes methods to install ducts/fibre-optic cables inside sewer ducts.
Language:English
Score: 1907728.7 - https://www.itu.int/dms_pub/it.../0B/04/T0B0400003B2C01PDFE.pdf
Data Source: un
The contractor shall remove thirty-five (35) units of axial inline return air fan mounted in the return air duct of AHUs at UNCC and install a new straight duct section of the same size as existing. 2. (...) The design and installation of the new duct shall be in accordance with the Sheet Metal and Air Conditioning Contractors' National Association (SMACNA). 18. The contractor shall perform testing and commissioning of the newly installed duct to ensure that airflow is uninterrupted, and air leakage is within the acceptable range.
Language:English
Score: 1810904.3 - https://www.un.org/Depts/ptd/s...pts.ptd/files/pdf/eoi20247.pdf
Data Source: un
Question(s): - 7 - Draft new Recommendation L.57 Air-assisted installation of optical fibre cable Summary This recommendation describes air-assisted methods for installation of optical fibre cable in ducts. These methods can be used to install micro cables into mini tubes, or jacketed cables into ducts or conduits. Installing conditions and equipment required shall be different in each case. ____________ Attention: This is not a publication made available to the public, but an internal ITU-T Document intended only for use by the Member States of the ITU, by ITU-T Sector Members and Associates, and their respective staff and collaborators in their ITU related work.
Language:English
Score: 1797477 - https://www.itu.int/itudoc/itu...g6aap/history/l57/l57s_ww9.doc
Data Source: un
The additional services include:  Airshafts with separation of regulating (conditioned) air, fresh air and exhaust air  Chimney duct to remove kitchen smoke  A garbage shaft with separate ducts to remove: metal, glass, plastics, batteries, electronic waste, kitchen waste, paper and cloth waste.  Linen shaft to allow linen to be sent to the laundry.
Language:English
Score: 1733180.7 - https://www.itu.int/en/publica.../files/basic-html/page421.html
Data Source: un
Conflict Zones Risk Information ICAO / Environmental Protection / Noise Reduction Technology Home Scientific Understanding Environmental Trends Technology Goals & Standards Aircraft Noise Trends Technology Goals Technology Standards (Reduction of noise at source) Land Use Planning and Management Noise Abatement Procedures Operating Restrictions Noise from Emerging Technology Aircraft Local Air Quality Trends Technology Goals Technology Standards Guidance on Airport Air Quality Climate Change Feasibility of a long-term global aspirational goal Trends Technology Goals Technology Standards Operational Measures Sustainable Aviation Fuels CORSIA Adaptation Financing Climate Neutral Initiative State Action Plans Frequently Asked Questions Facts and Figures E-learning Course Capacity Building and Assistance ICAO-EU Project -Phase II ICAO-EU Project -Phase I ICAO-UNDP Project ACT-CORSIA Buddy Partnerships Airports ATM Environmental Assessment Community Engagement Eco-Airport Toolkit e-collection CAEP E-Tools and Models ICAO E-Tools Models and Databases Innovation Innovative Fuels Electric Aircraft (E-HAPI) Circular Economy Publications Statements Events Contact Us Noise Reduction Technology   Resume Page Content In order to set noise Standards, an understanding of current research and technology development is imperative. (...) Extensive dedicated research (involving full engine ground and flight test demonstrators) combined with 3D unsteady, viscous analysis of the whole gas-path (air intake + fan + OGV + struts + bypass duct) can be expected to bring some additional gains. Better acoustic liner technology will help, but against this, the intake and bypass duct will get shorter in relation to diameter and this will reduce the area amenable to treatment.
Language:English
Score: 1727482 - https://www.icao.int/environme...oise-Reduction-Technology.aspx
Data Source: un
5 What refractivity parameters can be applied to clear-air prediction methods to take account of different climates? (...) 7 How can interaction between an antenna and the propagation medium be taken into account when considering modes of anomalous propagation (e.g. coupling into and out of ducts and the impact of use of omnidirectional, sector and high-gain antennas)? (...) 12 Which are the most effective clear-air and hydrometeor-scatter propagation models to allow effective frequency coordination and interference potential evaluation between earth stations for geostationary-satellite systems and those for non-geostationary satellite systems sharing the same frequencies on a “bidirectional working” basis?
Language:English
Score: 1659582.8 - https://www.itu.int/dms_pub/it...QUE-SG03.208-6-2019-MSW-E.docx
Data Source: un
  عربي   |   中文   |   Español   |   Français   |   Русский     Advanced Search   Home : ITU-T Home     2005-2008 ITU-T SG 6 Recommendations L series : Construction, installation and protection of cables and other elements of outside plant L.1 : Construction, installation and protection of telecommunication cables in public networks L.2 : Impregnation of wooden poles L.3 : Armouring of cables L.4 : Aluminium cable sheaths L.5 : Cable sheaths made of metals other than lead or aluminium L.6 : Methods of keeping cables under gas pressure L.7 : Application of joint cathodic protection L.8 : Corrosion caused by alternating current L.9 : Methods of terminating metallic cable conductors L.10 : Optical fibre cables for duct and tunnel application L.11 : Joint use of tunnels by pipelines and telecommunication cables, and the standardization of underground duct plans L.12 : Optical fibre splices L.13 : Performance requirements for passive optical nodes: Sealed closures for outdoor environments L.14 : Measurement method to determine the tensile performance of optical fibre cables under load L.15 : Optical local distribution networks – Factors to be considered for their construction L.16 : Conductive plastic material (CPM) as protective covering for metal cable sheaths L.17 : Implementation of connecting customers into the public switched telephone network (PSTN) via optical fibres L.18 : Sheath closures for terrestrial copper telecommunication cables L.19 : Multi-pair copper network cable supporting shared multiple services such as POTS, ISDN and xDSL L.20 : Creation of a fire security code for telecommunication facilities L.21 : Fire detection and alarm systems, detector and sounder devices L.22 : Fire protection L.23 : Fire extinction – Classification and location of fire extinguishing installations and equipment on premises L.24 : Classification of outside plant waste L.25 : Optical fibre cable network maintenance L.26 : Optical fibre cables for aerial application L.27 : Method for estimating the concentration of hydrogen in optical fibre cables L.28 : External additional protection for marinized terrestrial cables L.29 : As-laid report and maintenance/repair log for marinized terrestrial cable installation L.30 : Markers on marinized terrestrial cables L.31 : Optical fibre attenuators L.32 : Protection devices for through-cable penetrations of fire-sector partitions L.33 : Periodic control of fire extinction devices in telecommunication buildings L.34 : Installation of Optical Fibre Ground Wire (OPGW) cable L.35 : Installation of optical fibre cables in the access network L.36 : Single-mode fibre optic connectors L.37 : Optical branching components (non-wavelength selective) L.38 : Use of trenchless techniques for the construction of underground infrastructures for telecommunication cable installation L.39 : Investigation of the soil before using trenchless techniques L.40 : Optical fibre outside plant maintenance support, monitoring and testing system L.41 : Maintenance wavelength on fibres carrying signals L.42 : Extending optical fibre solutions into the access network L.43 : Optical fibre cables for buried application L.44 : Electric power supply for equipment installed as outside plant L.45 : Minimizing the effect on the environment from the outside plant in telecommunication networks L.46 : Protection of telecommunication cables and plant from biological attack L.47 : Access facilities using hybrid fibre/copper networks L.48 : Mini-trench installation technique L.49 : Micro-trench installation technique L.50 : Requirements for passive optical nodes: Optical distribution frames for central office environments L.51 : Passive node elements for fibre optic networks – General principles and definitions for characterization and performance evaluation L.52 : Deployment of Passive Optical Networks (PON) L.53 : Optical fibre maintenance criteria for access networks L.54 : Splice closure for marinized terrestrial cables (MTC) L.55 : Digital database for marine cables and pipelines L.56 : Installation of optical fibre cables along railways L.57 : Air-assisted installation of optical fibre cables L.58 : Optical fibre cables: Special needs for access network L.59 : Optical fibre cables for indoor applications L.60 : Construction of optical/metallic hybrid cables L.61 : Optical fibre cable installation by floating technique L.62 : Practical aspects of unbundling services by multiple operators in copper access networks L.63 : Safety procedures for outdoor installations L.64 : ID tag requirements for infrastructure and network elements management L.65 : Optical fibre distribution of access networks L.66 : Optical fibre cable maintenance criteria for in-service fibre testing in access networks L.67 : Small count optical fibre cables for indoor applications L.68 : Optical fibre cable maintenance support, monitoring and testing system for optical fibre cable networks carrying high total optical power L.69 : Personal digital assistant requirements and relevant data structure for infrastructure and network elements management L.70 : Managing active electronics in the outside plant L.71 : Design, construction, and installation of copper networks for broadband access including copper networks connected to optical fibre networks L.72 : Databases for optical access network infrastructure L.73 : Methods for inspecting and repairing underground plastic ducts L.74 : Maintenance of cable tunnels L.75 : Test, acceptance and maintenance methods of copper subscriber pairs, indoor network and structured cabling L.76 : Copper loop requirements for various technologies including indoor and structured cabling L.77 : Installation of optical fibre cables inside sewer ducts L.78 : Optical fibre cable construction for sewer duct applications L.79 : Optical fibre cable elements for micro-duct blowing-installation application L.80 : Operations support system requirements for infrastructure and network elements 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Language:English
Score: 1635030.5 - https://www.itu.int/ITU-T/2005...06/t05_sg6_recommendations.htm
Data Source: un
Only where the kitchen hood is located, and then proper closing should be done 2 4 Ducting track: Which direction the hood ducting will go? (...) A-2.9 Kitchen hood: Is with or without provision of fresh air? Provision for fresh air is not required Item no.
Language:English
Score: 1630784.8 - https://www.unhcr.org/jo/wp-co...2022/07/Prebid-Meeting-MoM.pdf
Data Source: un
L.108 Optical fibre cable elements for microduct blowing installation application (03/2018) Air blowing installation methods are based on viscous drag acting upon a cable within a duct by forcing a continuous high-speed airflow thorough the duct. (...) This technology is mainly characterized by the simultaneous work of a suction machine and a trench saw, which allows for the possibility of opening and closing the work site the same day. L.156 Air-assisted installation of optical fibre cables (03/2018) Air-assisted installation is based on forcing a continuous high-speed airflow along the cable with an air source. (...) This Recommendation describes air-assisted methods for installation of optical fibres cables in ducts.
Language:English
Score: 1584150.5 - https://www.itu.int/dms_pub/it...ut/T-TUT-L-2021-GLR-MSW-E.docx
Data Source: un