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  1. Perm (en ruso, Пермь, Perm ) es una ciudad y el centro administrativo del krai de Perm, Rusia, situada a orillas del río Kama en la parte europea de Rusia, cerca de los montes Urales. Entre 1940 y 1957 fue conocida como Mólotov (ruso: Молотов), nombrada en honor de Viacheslav Mólotov .

  2. › wiki › Perm,_RussiaPerm, Russia - Wikipedia

    The city is located on the banks of the Kama River, near the Ural Mountains, covering an area of 799.68 square kilometres (308.76 square miles), with a population of over one million residents. Perm is the fourteenth-largest city in Russia, and the fifth-largest city in the Volga Federal District .

    • October 29, 1781
    • Russia
    • May 15, 1723
    • Perm Krai
  3. › wiki › Perm_(unit)Perm (unit) - Wikipedia

    A perm is a unit of permeance or "water vapor transmission" given a certain differential in partial pressures on either side of a material or membrane. Definitions U.S. perm The U.S. perm is defined as 1 grain of water vapor per hour, per square foot, per inch of mercury.

  4. › wiki › PermPerm - Wikipedia

    Perm (hairstyle), or permanent hairstyle, that may last for several months. Perm (unit), a unit of permeance (or water vapor transmission) of materials and membranes. PERM (computer), an early electronic computer. PERM (labor certification) (Program Electronic Review Management), an American electronic labor certification system.

    • Overview
    • History
    • Modern perms
    • Technical considerations
    • Safety considerations
    • Home perms

    A permanent wave, commonly called a perm or permanent, is a hairstyle consisting of waves or curls set into the hair. The curls may last a number of months, hence the name. Perms may be applied using thermal or chemical means. In the latter method, chemicals are applied to the hair, which is then wrapped around forms to produce waves and curls. The same process is used for chemical straightening or relaxing, with the hair being flattened instead of curled during the chemical reaction.

    The first person to produce a practical thermal method was Marcel Grateau in 1872. He devised a pair of specially manufactured tongs, in which one of the arms had a circular cross-section and the other a concave one, so that one fitted inside the other when the tongs were closed. The tongs were generally heated over a gas or alcohol flame and the correct temperature was achieved by testing the tongs on a newspaper; if the paper browned slightly it was about right. The waving itself was safe if c

    In 1938, Arnold F. Willatt invented the cold wave, the precursor to the modern perm. It used no machines and no heat. The hair was wrapped on rods and a reduction lotion containing ammonium thioglycolate was applied. This chemical breaks open the disulfide linkages between the po

    Other types of modern perms include exothermic perms, which are self timing and self heating; and neutral, or low pH, thioglycolate free perms.

    There are two parts to a perm: the physical action of wrapping the hair, and the chemical phase. Both of these can affect the result. Important physical variables involved are what type of rod is used, how the hair is wrapped and how end papers are used. The two most common types of rods are straight and concave; each giving a different curl effect. The wrapping method is either spiral or croquinole, and various types and the positioning of end papers can be used with any combination of the abov

    Due to the harsh nature of the chemicals, it is important that contact with the skin be minimized. Modern chemicals are less irritating, but measures should still be taken to reduce contact with anything other than hair. A poorly performed permanent wave will result in breakage of the disulfide bonds through chemical reduction, because it fails to fix the newly formed bonds. This results in hair that is no longer elastic and flexible, but brittle and fragile. At this point, even combing the hair

    A number of brands of home permanent kits were available since the invention of the 'cold wave' in the 1940s, but their numbers have decreased as permanent waves are not as popular as they were in the 1980s. The first popular home permanent was the TONI brand, manufactured in Forest Lake, Minnesota. The Toni company used a set of twins to advertise their products; one with a salon perm and one with the home perm. They introduced a number of types and brands over the next four decades and a formu

    • Geografía
    • Galería
    • Enlaces Externos

    El krai de Perm está situado en el este de la llanura de Europa oriental y en la vertiente occidental de los montes Urales Medios. El 99,8 % de su área se encuentran en Europa, con un 0,2 % en Asia. El krai tiene por límites: al norte, la república de Komi; al noroeste, el óblast de Kírov; al suroeste, la república de Udmurtia; al sur, la república de Bashkortostan; y al este, el óblast de Sverdlovsk. Algunos datos geográficos: 1. longitud N-S: 645 km; 2. longitud E-O: 417,5 km. 3. punto más alto: monte Tulymski Kamen(1496 m) 4. fronteras: más de 2200 km

  5. Great Perm, artículo de la Wikipedia en inglés en el que se muestra un mapa de Gerardo Mercator, realizado en 1595 en Ámsterdam que muestra la región de Permia. Referencias [ editar ] ↑ Artículo sobre Cherdyn .

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