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A recipe for the preparation of sulfuric acid is mentioned in Risālat Jaʿfar al-Sādiq fī ʿilm al-ṣanʿa, an Arabic treatise falsely attributed to the Shi'i Imam Ja'far al-Sadiq (died 765). Julius Ruska dated this treatise to the 13th century, but according to Ahmad Y. al-Hassan it likely dates from an earlier period: [ 50 ]
The fitting characteristic of a respirator is the ability of the mask to separate a worker's respiratory system from ambient air. This is achieved by tightly pressing the mask flush against the face (without gaps) to ensure an efficient seal on the mask perimeter.
An open circuit SCBA typically has three main components: a high-pressure gas storage cylinder, (e.g., 2,216 to 5,500 psi (15,280 to 37,920 kPa), about 150 to 374 atmospheres), a pressure regulator, and a respiratory interface, which may be a mouthpiece, half mask or full-face mask, assembled and mounted on a framed carrying harness.
K-Beauty products are presented using sophisticated ingredients and appealing packaging. Products use ingredients ranging from more natural sources such as green tea leaves, orchid, soybean [28] to snail slime, morphing masks, bee venom (an anti-inflammatory "faux-tox" alleged to relax facial muscles), moisturizing starfish extract, and pig ...
In tropical British colonies gin was used to mask the bitter flavour of quinine, which was the only effective anti-malarial compound. Quinine was dissolved in carbonated water to form tonic water ; the resulting cocktail is gin and tonic , although modern tonic water contains only a trace of quinine as a flavouring.
Can we imagine ourselves back on that awful day in the summer of 2010, in the hot firefight that went on for nine hours? Men frenzied with exhaustion and reckless exuberance, eyes and throats burning from dust and smoke, in a battle that erupted after Taliban insurgents castrated a young boy in the village, knowing his family would summon nearby Marines for help and the Marines would come ...
A non-rebreather mask (NRB, non-rebreather, non-rebreather facemask, etc.) is a device used in medicine to assist in the delivery of oxygen therapy. A NRB requires that the patient can breathe unassisted, but unlike a low-flow nasal cannula , the NRB allows for the delivery of higher concentrations of oxygen .
The simple face mask can deliver higher flow rates than nasal cannula (6–10 liters per minute) for an FiO2 of 30- 60% oxygen. [1] Nasal cannula and simple face masks are described as low flow delivery systems. [2] [3] Unlike the non-rebreather and partial rebreather masks, the simple face mask lacks a reservoir bag.
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