They were sometimes reused after the conquest-placed in Christian crucifixes or remounted as symbols of vanity, an aspect of the Catholic deadly sin of pride. Ancient Mexican MirrorsĪuguste Génin, a Mexican collector of French descent, assembled a large collection of Pre-Columbian objects in Mexico City at the turn of the twentieth century.Īncient Mexican mirrors, such as these from Génin's collection, survive today in many shapes and sizes. Yet, as Smithson reminds us, art does not truly reflect life. Smithson's term "mirror-travel" describes how the reflective surfaces of the mirrors highlight the displacement of time and space. His images do not show tangible artifacts rather, they capture the mirrors arranged in the natural elements and as they reflect their surroundings. Smithson photographed mirrors near Maya ruins, in the jungle, and beside the sea. Yucatan Mirror Displacements, his resulting art piece, exists as three interrelated but discrete works: the physical placement of the mirrors in the landscape photographs of the mirrors and an article in Artforum whose was text modeled after Stephens's Incidents of Travel in Yucatan (1843). Although Smithson was traveling through Maya country, he believed he was impersonating the Aztec deity Tezcatlipoca, who he claims spoke to him, urging him to discard his guidebook and to make art that would collapse the gulf of time between the modern day and ancient Maya worlds. When used correctly, black obsidian can help clear away negative influences and allow you to see things more clearly. It is known for its ability to absorb negative energy, making it an excellent tool for protection and cleansing. In 1969, American artist Robert Smithson retraced the travels of writer John Lloyd Stephens, visiting Maya ruins in Chiapas and Yucatán. Black obsidian is a powerful stone often used in feng shui and other spiritual practices. Jaguar pelts were reserved solely for their use. Tezcatlipoca is sometimes represented as a jaguar, which was also a symbol of ancient Mexican rules. Tezcatlipoca was the lord of the night and its creatures-above all, the jaguar, a powerful animal believed capable of crossing between the earthly realm and the underworld. The obsidian mirror was the primary accessory of the supreme Aztec deity Tezcatlipoca, whose name means "smoking mirror." He is often depicted with an obsidian mirror on his chest, in his headdress, or replacing his right foot. Obsidian mirrors are an apt metaphor for images of ancient Mexican sites and objects: they reflect the viewer as well as the object. By gazing into a mirror's smoky depths, sorcerers traveled to the world of gods and ancestors. Large Obsidian Mirror - Scrying Mirror Polished Obsidian Mexican Obsidian - Black Crystal Protection - Divination Stone 100mm - 50mm HeartStoneHealing 19.34 Black Obsidian Scrying Mirror, magic mirror, 23cm (9') diameter/10mm thick ArtesINARO (306) 180. The peoples of ancient Mexico used polished obsidian mirrors, or tezcatl, as instruments of black magic.
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There are three P-H bonds at the PH3 molecular geometry. The PH3 molecule has a tetrahedral geometry shape because it contains three hydrogen atoms. What is the molecular geometry of PH3 molecule? There are three hydrogens, so it makes a single bond with each. (b) PH3: Phosphorus (Group 5A) has five valence electrons, and will complete its octet by making three bonds. No charges on phosphorous atom and hydrogen atoms. In phosphine (PH3) lewis structure, there are three sigma bonds and one lone-pair around phosphorous atom. Phosphine is a very toxic gaseous compound. These compounds are inorganic nonmetals in which the largest atom belongs to the class of ‘other nonmetals’. Phosphine, also known as or fosfano, is a member of the class of compounds known as homogeneous other non-metal compounds. a colorless, pungent, suffocating, highly water-soluble, gaseous compound, NH3, used chiefly for refrigeration and in the manufacture of commercial chemicals and laboratory reagents. The use of the prefix ”tri” in ”trihydride” tells us there are three hydrogen atoms in the compound. What is the chemical formula for Trihydride? Phosphorus trihydride: The chemical formula of Phosphorous trihydride is PH3 P H 3. What is the formula of phosphorus Trihydride? Their is no hybridization of PH3 according to drago rule What is the formula for phosphorus triiodide? It has a trigonal pyramidal shape and is a highly poisonous gas (Phosphine Gas). Is PH3 trigonal planar or pyramidal?īut the lone pair makes the compound asymmetrical w.r.t the charge distribution thats’s why it is a polar compound with non-polar bonds. After linking the three hydrogens and one lone pair of electrons in the tetrahedral form, it maintains the tetrahedral-like structure. Molecular geometry around phosphorous atom is tetrahedral. Phosphine is formed by the action of a strong base or hot water on white phosphorus or by the reaction of water with calcium phosphide (Ca3P2). Phosphine (PH3), also called hydrogen phosphide, a colourless, flammable, extremely toxic gas with a disagreeable garliclike odour. Phosphine is the common name for phosphorus trihydride (PH3), also known as phosphane (also phosphamine), which is a colorless, flammable gas with a boiling/condensation point of u221288 at standard pressure and auto-ignition temperature of 99.85 (Airgas, 2012). What is the name for phosphorus Trihydride? Phosphorus(1-) trihydride | H3P | ChemSpider. What is the symbol for phosphorus Trihydride? The chemical formula of Phosphorous trihydride is PH3 P H 3. What is the chemical formula for phosphorus Trihydride? Total valence electrons pairs around phosphorous atom is four. What is the formula for phosphorus Trihydride? Why is the molecular geometry of PH3 trigonal pyramidal?.Is PH3 trigonal planar or trigonal pyramidal?.What is the molecular geometry of PH3 molecule?.What is the chemical formula for Trihydride?.What does phosphorus and chlorine make?.What is the formula of phosphorus Trihydride?.What is the formula for phosphorus triiodide?.What is the name for phosphorus Trihydride?.What is the symbol for phosphorus Trihydride?.What is the chemical formula for phosphorus Trihydride?. But sleep is more complicated than you may think. Sleeping through the night may feel like one continuous session of uniform unconsciousness with a few dreams or interruptions here and there. Sleep Cycles, Sleep Stages, and REM Sleep What Are Sleep Cycles? The Sleep Cycle Strategy prioritizes waking up at ideal intervals along your sleep cycles, so you feel alert and refreshed. However, duration isn’t the only factor in the sleep health equation. The amount of sleep you get dramatically impacts your physical and mental well-being. The CDC provides the following sleep guidelines for a healthy body and mind depending on your age. The CDC lays it out simply, using research from the National Sleep Foundation, American Academy of Sleep Medicine, and Sleep Research Society. Our Sleep Cycle Strategy guide begins with the essential question: How much sleep do you need? How Much Sleep Do You Need? That said, many sleepers have found relief following sleep calculators. This guide reflects the latest research, but the Sleep Cycle Strategy is not a verified method of improving sleep quality or eliminating sleep inertia. Now that you’ve seen the calculator, you can dive into the theory behind it! As you read, remember that sleep is a complex science and not yet fully understood. Understanding the REM Sleep Cycle Calculator If you typically take more or less time to fall asleep, add or subtract those minutes from the projected wake-up time. Note: This table factors in 15 minutes to fall asleep, followed by 90-minute sleep cycles. However, we know that isn’t always possible and included projections for four sleep cycles (6 hours) in our chart as well. Per Centers for Disease Control and Prevention (CDC) guidelines, we recommend at least 7 hours of sleep each night. This calculator is intended for adults only. However, we recommend reading the remainder of this guide before using it so you understand how and why it works. We call using this calculator and technique the “Sleep Cycle Strategy.” What Time Should I Go to Sleep? What Time Should I Wake Up?įor quick reference, we’ve provided our Sleep Cycle Calculator table below. It enhances sleep quality and promotes easy, mental fog-free mornings.īy studying brain activity during sleep and morning cognitive test performance, scientists have determined the ideal window within the sleep cycle to wake up and start your day. Based on this information, a sleep calculator projects what time you should set your alarm given the time you go to bed, or vice versa. This strategy may prevent sleep inertia, the grogginess and disorientation you experience when you wake up abruptly from REM sleep.Ī sleep calculator is a tool or chart that tells you the ideal time to fall asleep and wake up. Using our Sleep Cycle Calculator, you can align your bedtime and wake-up time with your natural sleep cycle, making your mornings more manageable. Understanding REM sleep and sleep cycles at large can actually help you sleep better and feel more rested. The Rapid Eye Movement stage of sleep is, in fact, when dreaming-and essential memory consolidation-occurs. What Is Sleep Inertia and When Does It Occur?įinal Tips for Following the Sleep Cycle Strategyįrom the ‘80s rock band name to the title of Ariana Grande’s hit song and beauty line, the term “REM” has become a cultural signifier of dreams and imagination. Sleep Cycles, Sleep Stages, and REM Sleep Contains information for each document in the frame hierarchy up to the top-level document. For a top-level document, documentUrl is undefined. For example, if the web page at " " contains an image or an iframe, then the documentUrl for the image or iframe will be "". URL of the document in which the resource will be loaded. If the request is from a tab open in a contextual identity, the cookie store ID of the contextual identity. "requestBody": include requestBody in the details object passed to the listener."blocking": make the request synchronous, so you can cancel or redirect the request.You can pass any of the following values: A filter that restricts the events that will be sent to this listener. This enables the listener to process the request asynchronously. From Firefox 52 onwards, instead of returning BlockingResponse, the listener can return a Promise which is resolved with a BlockingResponse. If "blocking" is specified in the extraInfoSpec parameter, the event listener should return a BlockingResponse object, and can set either its cancel or its redirectUrl properties. The function will be passed the following arguments: details Syntaxįunction that will be called when this event occurs. If you use "blocking", you must have the "webRequestBlocking" API permission in your manifest.json. So if you canceled a request, you might see another request with the same requestId again if another blocking handler redirected the request.įrom Firefox 52 onwards, instead of returning BlockingResponse, the listener can return a Promise which is resolved with a BlockingResponse. Redirects and cancellations have the same precedence. When multiple blocking handlers modify a request, only one set of modifications take effect. HTTPS) URL to an extension page, the extension's manifest.json file must contain a web_accessible_resources key that lists the URL for the extension page. If an extension wants to redirect a public (e.g. to redirect the request, include a property redirectUrl with the value set to the URL to which you want to redirect.to cancel the request, include a property cancel with the value true.Then, in the listener function, return a BlockingResponse object, setting the appropriate property: To cancel or redirect the request, first include "blocking" in the extraInfoSpec array argument to addListener(). This is a good place to listen if you want to cancel or redirect the request. This event is triggered when a request is about to be made, and before headers are available. MAX_HANDLER_BEHAVIOR_CHANGED_CALLS_PER_10_MINUTES.Differences between API implementations. |
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