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The best designs use a supercapacitor instead of a rechargeable battery, since these have a longer working life than a battery. This, along with the long-life light-emitting diode which does not burn out like an incandescent bulb, give the flashlight a long lifetime, making it a useful emergency light. A disadvantage of many current models is ...
Other projects like AgeGuess [8] focus on the senior demographics and enable the elderly to upload photos of themselves so the public can guess different ages. Lists of citizen science projects may change. For example, the Old Weather project website indicates that as of January 10, 2015, 51% of the logs were completed. [9]
[7] There is a building of a 10,000-tree native food forest at the Rwamwanja Refugee Settlement in Uganda . The settlement which houses over 70,000 refugees, most with little food access or employment opportunities is an immediate beneficiary to this long-term project for the benefit of the refugees as well as the Host Community.
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire (likely copper) wound into a coil. A current through the wire creates a magnetic field which is concentrated along the center of the coil. The magnetic field disappears when the current is turned off.
For the majority of refugee and IDP populations under direct aid via government or humanitarian relief groups, camps of thousands live in small scout-style tents. [4] These emergency shelters consist of unplanned and spontaneously sought locations that are intended only to provide protection from the elements and typically constructed in large ...
Human Flow brings to light the obvious gravity of the current global refugee crisis and uses interviews from experts and refugees alike. The film shows various refugees in times of crisis and how refugee flows can be classified into four causation categories: wars between states, ethnic conflicts, non-ethnic conflicts and flights from repression. [7]
The first successful superconducting magnet was built by G.B. Yntema in 1955 using niobium wire and achieved a field of 0.7 T at 4.2 K. [10] Then, in 1961, J.E. Kunzler, E. Buehler, F.S.L. Hsu, and J.H. Wernick made the discovery that a compound of niobium and tin could support critical-supercurrent densities greater than 100,000 amperes per ...
Electromagnets are pre-sintered as well (pre-reaction), milled and pressed. However, the sintering takes place in a specific atmosphere, for instance one with an oxygen shortage. The chemical composition and especially the structure vary strongly between the precursor and the sintered product.