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Safety Testing Of Explosives
The safety testing of explosives involves the determination of various properties of the different energetic materials that are used in commercial, mining, and military applications. It is highly desirable to measure the conditions under which explosives can be set off for several reasons, including: safety in handling, safety in storage, and safety in use. It would be very difficult to provide an absolute scale for sensitivity with respect to the different properties of explosives. Therefore, it is generally required that one or more compounds be considered a standard for comparison to those compounds being tested. For example, PETN is considered to be a primary explosive by some individuals, and a secondary explosive by others. As a general rule, PETN is considered to be either a relatively insensitive primary explosive, or one of the most sensitive secondary explosives. PETN may be detonated by striking with a hammer on a hard steel surface (a very dangerous thing to do), and i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Explosives
An explosive (or explosive material) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure. An explosive charge is a measured quantity of explosive material, which may either be composed solely of one ingredient or be a mixture containing at least two substances. The potential energy stored in an explosive material may, for example, be: * chemical energy, such as nitroglycerin or Dust explosion, grain dust * pressure, pressurized gas compressor, gas, such as a gas cylinder, aerosol can, or boiling liquid expanding vapor explosion * nuclear weapon, nuclear energy, such as in the fissile isotopes uranium-235 and plutonium-239 Explosive materials may be categorized by the speed at which they expand. Materials that detonate (the front of the chemical reaction moves faster through the material than the speed of sound) are said to be "high ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Differential Scanning Calorimetry
Differential scanning calorimetry (DSC) is a thermoanalytical technique in which the difference in the amount of heat required to increase the temperature of a sample and reference is measured as a function of temperature. Both the sample and reference are maintained at nearly the same temperature throughout the experiment. Generally, the temperature program for a DSC analysis is designed such that the sample holder temperature increases linearly as a function of time. The reference sample should have a well-defined heat capacity over the range of temperatures to be scanned. Additionally, the reference sample must be stable, of high purity, and must not experience much change across the temperature scan. Typically, reference standards have been metals such as indium, tin, bismuth, and lead, but other standards such as polyethylene and fatty acids have been proposed to study polymers and organic compounds, respectively. The technique was developed by E. S. Watson and M. J. O'Ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Explosives Engineering
Explosives engineering is the field of science and engineering which is related to examining the behavior and usage of explosive materials. Topics Some of the topics that explosives engineers study, research, and work on include: * Development and characterization of new explosive materials in Use forms of explosives, various forms * Analysis of the physical process of detonation * Explosive generated shock waves and their effects on materials * Safety testing of explosives * Analysis and engineering of rock blasting for mining * Design and analysis of shaped charges and reactive armor * Design, analysis and application of military explosives such as grenades, Land mine, mines, Artillery shell, shells, aerial bombs, missile warheads, etc. * Bomb disposal * Drilling and blasting * Demolition Organizations * International Society for Explosive Engineers, International Society of Explosives Engineers (ISEE) * Missouri University of Science and Technology http://explosives.mst.e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fireworks Policy In The European Union
Fireworks policy in the European Union is aimed at harmonising and standardising the EU member states' policies on the regulation of production, transportation, sale, consumption and overall safety of fireworks across the European Union. Regulation is achieved via Directive 2013/29/EU on the harmonisation of the laws of the Member States relating to the making available on the market of pyrotechnic articles. History After a 2003 consultation, the European Commission introduced a proposal for a European guideline to harmonise the international trade in and safety of fireworks on 11 October 2005. The proposal classified fireworks into four categories on the European level. It stipulated that Category 4 is exclusively meant for professional usage, and that member states are allowed to limit the sale of fireworks to the public concerning the categories 2 and 3. The proposed minimal requirements for age limits can be heightened by the member states. This led to Directive 2007/23/EC, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dutch Safety Board
The Dutch Safety Board (DSB; , OVV, literally "Investigation Council for Safety") is the official body that investigates a wide variety of safety matters in the Netherlands. It is based in The Hague.History of the Safety Board " ''Dutch Safety Board''. Retrieved 29 April 2009. History The DSB was created in 2005 after the Enschede fireworks disaster and the Volendam café fire. The board was formed from a merger between the defence and public transportation safety boards. It replaced the[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
KRO-NCRV
KRO-NCRV is a Dutch public broadcasting company based in Hilversum established on 1 January 2014 from a merger of the broadcasters Catholic Radio Broadcasting (KRO) and the Dutch Christian Radio Association (NCRV), transmitting on NPO 1, NPO 2 and NPO 3 NPO 3 (known as Nederland 3 until 2014) is the third and youngest of the terrestrial television channels operated by the Dutch public-broadcasting organization NPO in the Netherlands. It carries programmes provided by member-based non-profit .... In 2016, the broadcaster also took on the programming from the former Roman Catholic Church Association (RKK) and proposed to serve "the Catholic and Protestant Christian communities" in the Netherlands. At the official census by the Media Commission in 2014, KRO-NCRV, in spite of a minor loss of membership, appeared to be the largest broadcaster in the Netherlands at the time, with nearly eight hundred thousand (798,930) members. References {{European Broadcasting Union ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fireworks
Fireworks are Explosive, low explosive Pyrotechnics, pyrotechnic devices used for aesthetic and entertainment purposes. They are most commonly used in fireworks displays (also called a fireworks show or pyrotechnics), combining a large number of devices in an outdoor setting. Such displays are the focal point of many cultural and religious Celebration (party), celebrations, though mismanagement could lead to List of fireworks accidents and incidents, fireworks accidents. Fireworks take many forms to produce four primary effects: noise, light, smoke, and floating materials (confetti most notably). They may be designed to burn with colored flames and sparks including red, orange, yellow, green, blue, purple and silver. They are generally classified by where they perform, either 'ground' or 'aerial'. Aerial fireworks may have their own Air propulsion, propulsion (skyrocket) or be shot into the air by a Mortar (weapon), mortar (aerial shell). Most fireworks consist of a paper or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Netherlands Organisation For Applied Scientific Research
The Netherlands Organisation for Applied Scientific Research (, abbreviated TNO, literally "Dutch Organisation for Applied Scientific Research") is an independent statutory research organisation in the Netherlands that focuses on applied science. It conducts contract research, offers specialist consulting services, and grants licenses for patents and specialist software. TNO also sets up new companies to market innovations. Background TNO was established by law in 1932 to support companies and governments. TNO also held 10% of the Austrian research center Joanneum Research from 2004 to 2014. Model The work of TNO is focused on the so-called Top Sectors, and social issues relevant to Europe. The Early Research Programmes and Shared Innovation Programmes are always funded in part with public funds. Research results are further developed and applied in contract research, which is fully funded by TNO's customers. Projects * TROPOMI: A satellite instrument that carries out measu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Netherlands
, Terminology of the Low Countries, informally Holland, is a country in Northwestern Europe, with Caribbean Netherlands, overseas territories in the Caribbean. It is the largest of the four constituent countries of the Kingdom of the Netherlands. The Netherlands consists of Provinces of the Netherlands, twelve provinces; it borders Germany to the east and Belgium to the south, with a North Sea coastline to the north and west. It shares Maritime boundary, maritime borders with the United Kingdom, Germany, and Belgium. The official language is Dutch language, Dutch, with West Frisian language, West Frisian as a secondary official language in the province of Friesland. Dutch, English_language, English, and Papiamento are official in the Caribbean Netherlands, Caribbean territories. The people who are from the Netherlands is often referred to as Dutch people, Dutch Ethnicity, Ethnicity group, not to be confused by the language. ''Netherlands'' literally means "lower countries" i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phase Transition
In physics, chemistry, and other related fields like biology, a phase transition (or phase change) is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic State of matter, states of matter: solid, liquid, and gas, and in rare cases, plasma (physics), plasma. A phase of a thermodynamic system and the states of matter have uniform physical property, physical properties. During a phase transition of a given medium, certain properties of the medium change as a result of the change of external conditions, such as temperature or pressure. This can be a discontinuous change; for example, a liquid may become gas upon heating to its boiling point, resulting in an abrupt change in volume. The identification of the external conditions at which a transformation occurs defines the phase transition point. Types of phase transition States of matter Phase transitions commonly refer to when a substance tran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Melting Point
The melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state of matter, state from solid to liquid. At the melting point the solid and liquid phase (matter), phase exist in Thermodynamic equilibrium, equilibrium. The melting point of a substance depends on pressure and is usually specified at a Standard temperature and pressure, standard pressure such as 1 Atmosphere (unit), atmosphere or 100 Pascal (unit), kPa. When considered as the temperature of the reverse change from liquid to solid, it is referred to as the freezing point or crystallization point. Because of the ability of substances to Supercooling, supercool, the freezing point can easily appear to be below its actual value. When the "characteristic freezing point" of a substance is determined, in fact, the actual methodology is almost always "the principle of observing the disappearance rather than the formation of ice, that is, the #Melting point measurements, melting ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thermal Sensitivity
A thermal column (or thermal) is a rising mass of buoyant air, a convective current in the atmosphere, that transfers heat energy vertically. Thermals are created by the uneven heating of Earth's surface from solar radiation, and are an example of convection, specifically atmospheric convection. Thermals on Earth The Sun warms the ground, which in turn warms the air directly above. The warm air near the surface expands, becoming less dense than the surrounding air. The lighter air rises and cools due to its expansion in the lower pressure at higher altitudes. It stops rising when it has cooled to the same temperature, thus density, as the surrounding air. Associated with a thermal is a downward flow surrounding the thermal column. The downward-moving exterior is caused by colder air being displaced at the top of the thermal. The size and strength of thermals are influenced by the properties of the lower atmosphere (the ''troposphere''). When the air is cold, bubbles of warm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
