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In some cases, a scleral buckle may also be used. Once the gel is removed, tension will be released, which will help prevent the pulling of the retina. One common surgery for retinal detachment is a vitrectomy, which involves removing the vitreous gel from the eye. In many cases, surgery is needed to reattach the retina and restore vision. The treatment for retinal detachment depends on the type, location, and severity of the detachment. If you experience sudden vision changes or any of the symptoms mentioned above, it is essential to contact your eye doctor at University Retina in Chicago, Illinois, right away. It occurs when the detached portion of the retina blocks or impairs the vision in that area. A shadow or curtain-like effect in the peripheral vision is a more serious symptom of retinal detachment. They can appear as small, bright, flashing lights or as a lightning-like streak across the field of vision.įlashes of light are often accompanied by floaters. While floaters are common and usually harmless, they can sometimes indicate a more serious condition, such as retinal detachment.įlashes of light are another common symptom of retinal detachment. It is important to note that these symptoms may not necessarily indicate retinal detachment and could be caused by other eye conditions.įloaters are small specks or dots that appear in the field of vision and move around when the eyes move. The symptoms of retinal detachment can include the sudden appearance of floaters, flashes of light, or a shadow or curtain-like effect in the peripheral vision. What Are the Symptoms of Retinal Detachment? Left untreated, a retinal detachment can cause severe and permanent vision loss.įor this reason, retinal detachments are considered medical emergencies. It is also more common in people who are nearsighted, have a family history of the condition, or have had an eye injury or surgery. Retinal detachments can also be caused by fluid buildup in the retina due to inflammation or injury. In some cases, scar tissue pulls the retina away from the underlying tissue. Sometimes, a tear or hole develops in the retina, allowing fluid to leak into the space between the retina and the underlying tissue. There are several different types of retinal detachment. When the retina becomes detached, it separates from its underlying layer of blood vessels and loses its ability to function properly. The retina is a thin layer of tissue located at the back of the eye that is responsible for detecting light and transmitting signals to the brain, allowing you to see. This condition can occur at any age but more commonly for those over fifty. Retinal detachment is a serious medical condition that affects the eye and can lead to permanent vision loss. At University Retina, our team of board-certified ophthalmologists and retina specialists can restore your vision and ensure the long-term health of your eyes. Do you have spots, floaters, or flashes of light that disturb your vision? These can indicate a severe problem with your retina that may permanently affect your eyesight. In most cases, it's better to err on the side of caution, especially if you are overweight or have a family history of heart problems. It's quite common for people to visit the emergency room with heartburn symptoms. That said, it's important to seek immediate medical attention if you are worried or confused about any of your symptoms. If your symptoms go away when you alter your body's position, you are most likely suffering from heartburn. In fact, doctors sometimes need sophisticated medical testing to rule out a dangerous medical problem. Is it just heartburn and sore muscles Or is it something more. How Can I Tell the Difference? It can be so difficult to distinguish a heart attack from severe heartburn. A burning painful sensation in your chest, an uncomfortable pain in your back and shoulders. In these conditions, the pain increases during certain activities or movements. Pain that radiates to the jaw, neck, arms or shoulders However, heartburn and a pulmonary embolism may worsen chest pain when bending forward.Sudden chest pressure or pain that worsens In stark contrast, heart attacks always are considered medical emergencies and need immediate attention, as many heart attacks are life-threatening.Sensation of a belt constricting your chest.Dull pressure, tightness, fullness or pain in the chest.Heart Attack Symptoms A sudden occurrence of coronary thrombosis (blockage of the flow of blood to the heart), a heart attack tends to manifest in the following ways: Chronic hoarseness, sore throat or cough.A strange sensation that food is "stuck" in the throat or chest.Sour, acidic or hot fluid at the back of the throat.Chest pain that changes or worsens when you eat, lie down or bend over.This is due to the stomach acid flowing back up into the esophagus. Burning just behind the breastbone after eating, with symptoms persisting a few minutes to several hours The most frequent symptom of acid reflux or heartburn is a feeling of warmth, heat, or burning in the chest and throat.While triggers can vary, the symptoms usually include: Heartburn Symptoms Heartburn sensations occur when stomach acid moves upward from the stomach into the esophagus. If you're worried about unexplained sensations, learn how these two conditions differ and find out when to seek immediate help. It can be difficult to differentiate severe heartburn from a dangerous heart attack, even for professionally trained doctors. Each through a specific realm of inquiry, they have labored toward an understanding of how both collective and individual agency could manifest in processes of learning, despite-and because of-structures that have failed us.Īt the time of writing, these are the study nodes feeding UPS. Acting as UPS’s agent faculty ahead of the project, seven study nodes spent months doing outreach and field work to construct a curriculum informed by a current landscape. This event is curated by Reading Rhythms Club, a nomadic reading club currently stewarded by design researcher Senka Milutinovi ć and cultural worker Julia Wilhelm.įore/Afterwords from the (Community) PortalĪs a follow-up of sorts of Trainings for the Not-Yet (2019/2020) convened by BAK and artist Jeanne van Heeswijk and Clara Balaguer with multiple collaborators in Utrecht and beyond, UPS rehearses the idea of an exhibition as a series of trainings, this time configured as the bones of a temporary school. The evening will culminate in a party, of course, with music that explores the ultra as a space of cultural encounter. Experimental forms of reading and discussion, collective annotations, and musical reviews will take place throughout the schoolhouse. The daytime program will consist of a walk-and-talk-and-read through of the exhibition, featuring the voices of UPS collaborators in thought and practice. On opening day, UPS will start of with RRRadiossage.This is a long-form (eight-hour) hybrid radio broadcast-a combination of real-life gatherings at UPS schoolhouse, broadcast on a relay of online radio stations: Stranded FM (Utrecht) via lumbung radio (interlocal) via other radio mirrors to be determined. It navigates kitchens, print shops, housing squats, community centers, garages, radio stations, hallways, and sidewalks as sites of study. Emphasizing study as a radically collective, public labor that lives in-between institutionalized hierarchies, UPS inhabits the edges between formal classrooms and everyday life. UPS is co-convened with an extended faculty of students, educators, and practitioners. Ultradependent Public School is a curriculum to learn what we really need to enact the worlds we really want. The DO module will then burn up over a remote part of the ocean. The DO and VA modules will remain connected during the most of the flight separating only during the final reentry into the Earth's atmosphere at the end of the mission. During the launch and the ascent to orbit, the DO module will be protected by a payload fairing, which will split into several segments and fall away above the dense atmosphere. In July 2016, ZAO Orbita based in the city of Voronezh announced a contract with RKK Energia to develop equipment for power distribution and control aboard the PTK spacecraft, which had to be delivered in 2020.Ī special detachable umbilical mast will connect key systems of the DO module and the Return Vehicle, VA, carrying the crew. Various avionics and power batteries will be located inside the DO module along with the tanks of the propulsion system. On its exterior, the DO module will carry a pair of deployable solar panels, the main communications antenna capable of maintaining link with ground control at lunar distances, the main rendezvous antenna of the Kurs-NA system, star trackers and other sensors of the flight control and navigation system. The exterior design of the Propulsion Module, DO, circa 2013. Propellant supplies in the low-pressure tanks of the PO module would be able to provide a total of around 1,300 meters per second in velocity change to the spacecraft, first of all for the departure from the lunar orbit toward Earth. The similar engine is used on the Fregat upper stage. The main propulsion system, KDU, is expected to include a dual s5.92 engine with a trust of two tons each developed at KB Khimmash design bureau in Korolev. Four more pairs of engines will be located on the aft bulkhead of the module. Four clusters will be located in the front of the module, including a pair containing six engines each, and another two groups with five engines. The Soviet Union still achieved many more firsts: the first lunar rover, the first soft landing on Venus, the first soft landing on Mars, the first recovery of samples from the Moon by automatic spacecraft.The expendable propulsion module, known in Russian as Dvigatelny Otsek or DO, of the PTK spacecraft was designed to accommodate the ship's propulsion system, including a dual main engine and eight clusters of attitude control and orientation engines, DPOs, distributed around the module. Undaunted, the Soviet Union rebuilt its space program around orbiting stations, building the first one, Salyut, and then the first permanent home in space, Mir. The Soviet Union engaged in that race far too late, with divided organization, and made a gallant but doomed challenge to Apollo. In 1964, the Soviet Union decided to contest the decision of the United States to put the first person on the Moon. Except one, the first human landing on the Moon. The Soviet Union achieved all the great firsts in cosmonautics-the first satellite in orbit, the first animal in orbit, the first laboratory in orbit, the first probe to the Moon, the first probe to photograph its far side, the first soft landing on the moon, the first man in space, the first woman in space, the first spacewalk. At that time, few could have imagined the dramatic events that lay head. The rebirth of the Russian space program marks an important event: 50 years since the first Sputnik was launched on 4th October 1957. You can even add other elements like trees, flowers, or houses to the background. Experiment and have fun! This is your opportunity to be creative and let your imagination run wild. This could be anything from simple solid color to a more complex landscape. To finish off your drawing, add a background behind your cat. You can also make your cat look like a tabby cat by adding stripes for the cat’s fur pattern. 6: Make it Colorfulįinally, use color to bring your cat to life! Choose bright colors or patterns that reflect your cat’s personality or the setting it will be placed in. You can also add extra embellishments like bows, glasses, or other accessories to make your cat genuinely unique! Of course, many people like to add flowers or other patterns to their cats’ fur as well. To add some character and personality to your cat, consider drawing it holding an item like a heart or boba tea like the example or anything you’d like! You can make the fur as dense or as sparse as you like. If you want a more realistic cat, you can also add some fur to the body and tail by drawing short, curved lines. With the cat tail, you can have it curled up or hanging down. The body should be roughly oval-shaped and slightly larger than the head of the cat. Next, draw out the outline of the cat body and tail. You can add extra detail by drawing in claws and cat’s paws at the end of each hind leg. Below the front legs, add the back leg on each side. The cat’s front leg on both sides should be placed below the head so that the cat appears in an upright position. 3: Fill in the Cat’s Legsįor the next step, add the legs of your cat. The eyes should be large and almond-shaped. You can make the whiskers as long or as short as possible, but they should be thin and evenly spaced. Once you’re happy with the position of the eyes, go ahead and add some pupils. Next, slightly below the middle of the cat’s head, draw in the cat’s whiskers, cat’s eyes, cat’s nose and cat’s mouth. The head should be roughly circular, with a distinct nose and chin area. Don’t be afraid to take it slow and lightly sketch your outline so that you can easily erase. On your piece of paper, begin by outlining the cat’s head. This is because it provides a flat, level surface to work on.Įasy Step by Step for Drawing a Cat 1: Draw the Cat Outline Stable Drawing Surface: Tools are great but are useless without a stable drawing surface.You can also outline the design with a fineliner black pen. Coloring Materials : Once your design is finished, fill in the design with colored pens, colored pencils or crayons.Pencil Sharpener: Another thing you’ll need is a pencil sharpener to keep the pencil lead sharp and ready to use.Mistakes are inevitable for any new drawer, so this is a must-have. Eraser: You’ll need an eraser that can help eliminate any mistakes you’ll make.Make sure to avoid paper that is rough, especially for newbies. Paper: High-quality paper with a smooth surface is also needed.A pencil’s lead is also soft enough to erase. Pencil: It’s always best to start your cat sketch with a pencil in order to create thin and precise, delicate lines.But, first, let’s look at what you’ll need to start drawing a cat! Materials Needed to Draw a Cat When you’re ready to start drawing your cat, follow the simple how to draw a cat step by step guidelines ahead. Plus, they can be drawn in various poses, so you have plenty of options. Cats are known for their unique features, so capturing these in your drawing is essential. See our full disclosure here.Īnyone can learn how to draw a cat easily, step-by-step! It just takes some practice and patience to draw even a complex masterpiece, no matter your experience! While it’s common for people to struggle with drawing cats, you can become a master of sketching these furry creatures with just a little practice and guidance. As an Amazon Associate, I earn from qualifying purchases. Therefore, the hydration energy is becomes smaller. Similarly the forces of attractions between the positive ion and the water molecules are also smaller. When an positively charged ion, has smaller size then the charge density is also smaller. Factors affecting the hydration energy Size of the ion Therefore, it is called the hydration energy of H + ion. When one mole of gaseous hydrogen ions is dissolved in water to give an infinitely dilute solution then 1075 KJ of energy is evolved. Because when CaCl 2 is dissolved into water, the water becomes hot because it releases the energy which means that hydration energy completely overcomes the lattice energy. For such salts energy is released in the form of heat.ĭissolvation of CaCl 2 is the perfect example of this process. Our results show that the lattice energy of MgO is higher than that of NaCl.At this point if the hydration energy is equal to or greater than the lattice energy, then the solute (salt) is said to be water-soluble. b) Charge of ionsīecause of the stronger attraction between the ions, lattice energy increases as the charge on the ions increases.Īs a result, ions with a charge of +2 or -2 will release more lattice energy than ions with a charge of +1 or -1. The result is a reduction in their attraction, which in turn releases less lattice energy. This is because as the size of ions grows, so does the distance between their nuclei. The lattice energy of lithium halide is shown on the graph below.Īs you move down the group, the size of the halide grows larger and the lattice energy starts decreasing. a) Radius of ionsĪs the distance between ions grows larger, the lattice energy goes down. And lattice energy depends on two factors: size or radius of ions and charge of ions. The strength of the ionic bond increases with the increase of lattice energy. Because of this, the lattice energy keeps rising as well. As we move across a period, the charge on ions like K+, Ca2+, Ga3+, etc., increases. When the charge on an ion gets higher.So, as the radius gets smaller, the lattice energy goes up. This means that the protons pull on the electrons more and more. So, as we move from one period to the next, the atomic radius of elements gets smaller. By reducing the distance between atoms.Usually, two main things need to happen to increase lattice energy. lattice energy increase across a periodĪs we move from one period to the next, the lattice energy keeps rising. In the end, the process releases less lattice energy. So, the attraction between them gets weaker. This is because as the size of ions gets larger, the distance between their nuclei grows larger, as well. This creates calcium oxide (CaO) crystals, which release 3414 kJ of energy.Ĭa2+ (g) + O2- (g) → CaO (s) ΔHlattice = -3414 kJ/mol Calcium Chloride (CaCl2)Ĭalcium chloride (CaCl2) crystallizes when calcium ion (Ca2+) and chloride ion (Cl-) combine, releasing 2195 kJ of energy.Ĭa2+ (g) + 2 Cl– (g) → CaCl2 (s) ΔHlattice = -2195 kJ/mol Lattice Energy Trend lattice energy decreases down the groupĪs we move down the group, the lattice energy continues to decrease. Na +(g) + Cl –(g) → NaCl(s) ΔHlattice = -787.3 kJ/mol Calcium Oxide (CaO)Īn oxide ion (O 2) is formed when calcium ion (Ca 2+) combines with calcium ion (Ca 2+). When an ionic compound is made from a cation and an anion, lattice energy is released.Ī + + B – → A+B– + Lattice energy Lattice Energy Examples Sodium Chloride (NaCl)ħ87.3 kJ of energy is released when sodium ions (Na +) combine with chloride ions (Cl –). The process releases lattice energy or lattice enthalpy. An ionic compound is formed when two ions join together. A stronger electrostatic force between opposing ions strengthens the stability of ionic compounds. See that thing on the ground there that kind of looks like a squished "Star Wars" fighter or something, kind of that odd-shaped angular thing there? That`s a blast door. This is an American nuclear missile silo. They announced that something had happened in Cheyenne, Wyoming, that was a little unusual. But we were on the brink, October 22nd, 1962.Įxactly, exactly 25 years after that, on the 25th anniversary of the closest we have ever been to global nuclear war, the United States Air Force made an announcement. The Russians did ultimately get them out of there without a nuclear war. threatened a nuclear war to get those missiles out of there. We won`t shrink from that if it must be faced. He says we are not prematurely or unnecessarily going to have a nuclear war, but we might have to have a nuclear war. Kennedy addressing the nation at the apex of the Cuban missile crisis in 1962. But neither will we shrink from that risk at any time it must be faced. We will not prematurely or unnecessarily risk the course of worldwide nuclear war in which even the fruits of victory would be ashes in our mouth. But now, further action is required and it is under way and these actions may only be the beginning. We have been determined not to be diverted from our central concerns by mere arrogance and fanatics. PRESIDENT: Our policy has been one of patience and restraint as befits a peaceful and powerful nation which leads a worldwide alliance. And in that speech to the country, he basically warned the people of the United States that maybe we`re about to have a nuclear war. Kennedy gave a freaking, terrifying speech to the country. MADDOW: And thanks to you at home for being with us this hour. RACHEL MADDOW, MSNBC HOST: Good evening, Chris. Show: THE RACHEL MADDOW SHOW Date: NovemGuest: Cecile RichardsĬHRIS HAYES, "ALL IN" HOST: THE RACHEL MADDOW show starts right now. 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Your standard string lights are likely going to have a plug for an AC wall outlet. However, I’ve also included a set of color-changing LED strip lights that lets you do both.įinally, consider the power source. String lights can't be cut without damaging the wiring, and most can't be combined end-to-end on the same strand. Measure out your space or potential hanging area before you start shopping. A $12 price tag might initially seem like a good deal - until you realize the strand is 10 feet long and has barely any bulbs. It's also extremely important to note the length of the strand and the amount of lights you're getting for the cost. For the yard, you'll need something waterproof and weatherproof, but for inside, those features are a convenience, not a necessity. Still, there are a few important factors that'll help you narrow down your options.įirst, the difference between indoor lights and outdoor lights really only matters if you're planning on using them outdoors. The best indoor string lights (also known as fairy lights) will largely depend on the type of aesthetic you're going for bulb size, type, color, and warmth are mostly a matter of preference. Lighting is a key element when it comes to eliciting a certain mood, and string lights are especially great for cozy, whimsical, or festive spaces. |
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