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  Iván Teruel uploaded a new part Dulzaina @ PARTcloud.net

  

  Dulzaina

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  Peter Farkas uploaded a new part AUBO-i10 V4 @ PARTcloud.net

  

  AUBO-i10 V4

  • 5 hours ago
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  Nemanja Petkov
  

  • 6 hours ago

  • Rosie Roza and Esmir Duraković like this.
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  Peter Farkas uploaded a new part AUBO-i7 v4 @ PARTcloud.net

  

  AUBO-i7 v4

  • 6 hours ago
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  Peter Farkas uploaded a new part AUBO-i5 (v4) @ PARTcloud.net

  

  AUBO-i5 (v4)

  • 6 hours ago
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  Rosie Roza created a new knowledge: Sandstone (en)

  Sandstone (en)

  Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) mineral particles or rock fragments.
  Most sandstone is composed of quartz or feldspar (both silicates) because they are the most resistant minerals to weathering proces...  moreSandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) mineral particles or rock fragments.
  Most sandstone is composed of quartz or feldspar (both silicates) because they are the most resistant minerals to weathering processes at the Earth's surface, as seen in Bowen's reaction series. Like uncemented sand, sandstone may be any color due to impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Since sandstone beds often form highly visible cliffs and other topographic features, certain colors of sandstone have been strongly identified with certain regions.
  Rock formations that are primarily composed of sandstone usually allow the percolation of water and other fluids and are porous enough to store large quantities, making them valuable aquifers and petroleum reservoirs. Fine-grained aquifers, such as sandstones, are better able to filter out pollutants from the surface than are rocks with cracks and crevices, such as limestone or other rocks fractured by seismic activity.
  Quartz-bearing sandstone can be changed into quartzite through metamorphism, usually related to tectonic compression within orogenic belts....    less

  • 6 hours ago
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  Peter Farkas uploaded a new part AUBO-i3-4-V2.0 @ PARTcloud.net

  

  AUBO-i3-4-V2.0

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  Ihor Cherpack pin onto 3D CAD MODELS @ Ihor Cherpack:

  

  3D CAD MODELS- SH-A 形

  ja: SH-A 形
  en: Type SH-A

  • 6 hours ago
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  Rosie Roza created a new knowledge: Chemical element (en)

  Chemical element (en)

  A chemical element is a species of atom having the same number of protons in their atomic nuclei (that is, the same atomic number, or Z). For example, the atomic number of oxygen is 8, so the element oxygen consists of all atoms which have exactly 8 proto...  moreA chemical element is a species of atom having the same number of protons in their atomic nuclei (that is, the same atomic number, or Z). For example, the atomic number of oxygen is 8, so the element oxygen consists of all atoms which have exactly 8 protons.
  118 elements have been identified, of which the first 94 occur naturally on Earth with the remaining 24 being synthetic elements. There are 80 elements that have at least one stable isotope and 38 that have exclusively radionuclides, which decay over time into other elements. Iron is the most abundant element (by mass) making up Earth, while oxygen is the most common element in the Earth's crust.Chemical elements constitute all of the ordinary matter of the universe. However astronomical observations suggest that ordinary observable matter makes up only about 15% of the matter in the universe: the remainder is dark matter; the composition of this is unknown, but it is not composed of chemical elements.
  The two lightest elements, hydrogen and helium, were mostly formed in the Big Bang and are the most common elements in the universe. The next three elements (lithium, beryllium and boron) were formed mostly by cosmic ray spallation, and are thus rarer than heavier elements. Formation of elements with from 6 to 26 protons occurred and continues to occur in main sequence stars via stellar nucleosynthesis. The high abundance of oxygen, silicon, and iron on Earth reflects their common production in such stars. Elements with greater than 26 protons are formed by supernova nucleosynthesis in supernovae, which, when they explode, blast these elements as supernova remnants far into space, where they may become incorporated into planets when they are formed.The term "element" is used for atoms with a given number of protons (regardless of whether or not they are ionized or chemically bonded, e.g. hydrogen in water) as well as for a pure chemical substance consisting of a single element (e.g. hydrogen gas). For the second meaning, the terms "elementary substance" and "simple substance" have been suggested, but they have not gained much acceptance in English chemical literature, whereas in some other languages their equivalent is widely used (e.g. French corps simple, Russian простое вещество). A single element can form multiple substances differing in their structure; they are called allotropes of the element.
  When different elements are chemically combined, with the atoms held together by chemical bonds, they form chemical compounds. Only a minority of elements are found uncombined as relatively pure minerals. Among the more common of such native elements are copper, silver, gold, carbon (as coal, graphite, or diamonds), and sulfur. All but a few of the most inert elements, such as noble gases and noble metals, are usually found on Earth in chemically combined form, as chemical compounds. While about 32 of the chemical elements occur on Earth in native uncombined forms, most of these occur as mixtures. For example, atmospheric air is primarily a mixture of nitrogen, oxygen, and argon, and native solid elements occur in alloys, such as that of iron and nickel.
  The history of the discovery and use of the elements began with primitive human societies that found native elements like carbon, sulfur, copper and gold. Later civilizations extracted elemental copper, tin, lead and iron from their ores by smelting, using charcoal. Alchemists and chemists subsequently identified many more; all of the naturally occurring elements were known by 1950.
  The properties of the chemical elements are summarized in the periodic table, which organizes the elements by increasing atomic number into rows ("periods") in which the columns ("groups") share recurring ("periodic") physical and chemical properties. Save for unstable radioactive elements with short half-lives, all of the elements are available industrially, most of them in low degrees of impurities.  less

  • 6 hours ago
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  Rosie Roza created a new knowledge: Earth science (en)

  Earth science (en)

  Earth science or geoscience includes all fields of natural science related to the planet Earth. This is a branch of science dealing with the physical constitution of the Earth and its atmosphere. Earth science is the study of our planet’s physical charac...  moreEarth science or geoscience includes all fields of natural science related to the planet Earth. This is a branch of science dealing with the physical constitution of the Earth and its atmosphere. Earth science is the study of our planet’s physical characteristics, from earthquakes to raindrops, and floods to fossils. Earth science can be considered to be a branch of planetary science, but with a much older history. Earth science encompasses four main branches of study, the lithosphere, the hydrosphere, the atmosphere, and the biosphere, each of which is further broken down into more specialized fields.
  There are both reductionist and holistic approaches to earth sciences. It is also the study of Earth and its neighbors in space. Some earth scientists use their knowledge of the planet to locate and develop energy and mineral resources. Others study the impact of human activity on Earth's environment, and design methods to protect the planet. Some use their knowledge about earth processes such as volcanoes, earthquakes, and hurricanes to plan communities that will not expose people to these dangerous events.
  The earth sciences can include the study of geology, the lithosphere, and the large-scale structure of the earth's interior, as well as the atmosphere, hydrosphere, and biosphere. Typically, earth scientists use tools from geography, chronology, physics, chemistry, biology, and mathematics to build a quantitative understanding of how the earth works and evolves. Earth science affects our everyday lives. For example, meteorologists study the weather and watch for dangerous storms. Hydrologists study water and warn of floods. Seismologists study earthquakes and try to predict where they will strike. Geologists study rocks and help to locate useful minerals. Earth scientists often work in the field—perhaps climbing mountains, exploring the seabed, crawling through caves, or wading in swamps. They measure and collect samples (such as rocks or river water), then they record their findings on charts and maps.  less

  • 6 hours ago
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  Rosie Roza created a new knowledge: Geology (en)

  Geology (en)

  Geology (from the Ancient Greek γῆ, gē ("earth") and -λoγία, -logia, ("study of", "discourse")) is an earth science concerned with the solid Earth, the rocks of which it is composed, and the processes by which they change over time. Geology can also inclu...  moreGeology (from the Ancient Greek γῆ, gē ("earth") and -λoγία, -logia, ("study of", "discourse")) is an earth science concerned with the solid Earth, the rocks of which it is composed, and the processes by which they change over time. Geology can also include the study of the solid features of any terrestrial planet or natural satellite such as Mars or the Moon. Modern geology significantly overlaps all other earth sciences, including hydrology and the atmospheric sciences, and so is treated as one major aspect of integrated earth system science and planetary science.
  
  Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Earth's past climates.
  Geologists use a wide variety of methods to understand the Earth's structure and evolution, including field work, rock description, geophysical techniques, chemical analysis, physical experiments, and numerical modelling. In practical terms, geology is important for mineral and hydrocarbon exploration and exploitation, evaluating water resources, understanding of natural hazards, the remediation of environmental problems, and providing insights into past climate change. Geology is a major academic discipline, and it plays an important role in geotechnical engineering.  less

  • 6 hours ago
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  Rosie Roza created a new knowledge: Sediment (en)

  Sediment (en)

  Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sand and silt can ...  moreSediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sand and silt can be carried in suspension in river water and on reaching the sea bed deposited by sedimentation. If buried, they may eventually become sandstone and siltstone (sedimentary rocks) through lithification.
  Sediments are most often transported by water (fluvial processes), but also wind (aeolian processes) and glaciers. Beach sands and river channel deposits are examples of fluvial transport and deposition, though sediment also often settles out of slow-moving or standing water in lakes and oceans. Desert sand dunes and loess are examples of aeolian transport and deposition. Glacial moraine deposits and till are ice-transported sediments....    less

  • 7 hours ago
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  Armando Merola pin onto 3D CAD MODELS @ Armando Merola:

  

  3D CAD MODELS- Ensat®-S metrický - Závitová vložka, samořezná, vnitřní závit metrický - pro použití v kovech

  cs: Ensat®-S metrický - Závitová vložka, samořezná, vnitřní závit metrický - pro použití v kovech
  de: Ensat®-S metrisch - Gewinde-Einsatz selbstschneidend, Innengewinde metrisch - für Metallanwendungen
  en: Ensat®-S metric - Threaded insert self-...  morecs: Ensat®-S metrický - Závitová vložka, samořezná, vnitřní závit metrický - pro použití v kovech
  de: Ensat®-S metrisch - Gewinde-Einsatz selbstschneidend, Innengewinde metrisch - für Metallanwendungen
  en: Ensat®-S metric - Threaded insert self-tapping, metric inner thread - for application in metal
  it: Ensat®-S metrica - Inserto autofilettante, filettatura interna metrica - per applicazioni in metallo
  fr: Ensat®-S métrique - Douilles filetées auto-taraudeuses, pour application en métraux – taraudage métrique
  pl: Ensat®-S gwint metryczny - Wkładka gwintowana samonacinająca, gwint wewnętrzny metryczny, do zastosowań metalowych
  hu: Ensat®-S metrikus - Menet-betét, önmetsző, metrikus beső menet - fémekhez  less

  • 7 hours ago
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  Nemanja Petkov
  

  • 7 hours ago

  • Rosie Roza and Kristina Kusnjer like this.
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  Ihor Cherpack pin onto 3D CAD MODELS @ Ihor Cherpack:

  

  3D CAD MODELS- SMA 形

  ja: SMA 形
  en: Type SMA

  • 8 hours ago