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State system for ensuring the uniformity of measurements. Nuclear-physical characteristics and other main data on properties of materials and substances used in the field of nuclear science and technology. Basic principles. Part 1. Radionuclide nuclear-physical characteristics

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Radio-frequency cable type PK 75-4-15. Specifications

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Renewable power engineering. Solar energy. Methods of testing preformed rubber seals and sealing compounds used in collectors

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Electrical relays. Part 12. Directional relays and power relays with two input energizing quantities

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Low-voltage switchgear and controlgear. Part 5-4. Control circuit devices and switching elements. Method of assessing the performance of low-energy contacts. Special tests

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Water-tube boilers and auxiliary installations. Part 7. Requirements for equipment for the boiler

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