Social Media And Its Impact On Society Essay - 2391 Words

Engdahl (168) defines social media as â€Å"mobile-based and web-based technologies that allow interactive communication through the internet.† In this data age, Social Media has turned into a fundamental piece of individuals day by day lives over the globe. In spite of the traditional media, for example, radio, TV and print, online networking reaches out past simple data and thoughts sharing. Despite the way that online networking is a generally new marvel; it is progressively turning into a vital segment of a company s showcasing and client base advancement stage. According to the Merriam- Webster dictionary, Social media is defined as forms of electronic communication (as Web sites for social networking and blogging) through which users create online communities to share information, ideas, personal messages, and other content (as videos). The same source defines networking as the exchange of information or services among individuals, groups, or institutions; specifically: the cultivation of productive relationships for employment or business. Previously, internet users were limited to instant messaging and email but now it has became a common mode of communication with the rise of social media. More or less Social media has turned into a habit and its usage is increasing day by day in entire world. Social Media is a marvel that has changed the connection and correspondence of people all through the world. Nonetheless, online networking is not another idea - it has beenShow MoreRelatedImpact Of Social Media On Society Essay917 Words   |  4 PagesHave you thought about the impact that social media has on society? Today I would like to address the impact of social media on society for those of you that are social media users and this includes the advantages or disadvantages that as associated with it. In this speech, I want to relate to you how social media is being used by social media users. Social media has forever changed the way society works, whether it’s the sharing of an idea, the communication of news, or the availability of productsRead MoreSocial Media And Its Impact On Society1420 Words   |  6 PagesSocial media as we know has changed. Now instead of messaging we are able to video chat, and instead of not knowing where someone is now we are able to see there locations and where they live. This is all because of social media. Social media has taken the world by storm including social media sites like Facebook, Twitter, and Instagram all sites where we communicate through text, videos, pictures, and much more. Rhetoric is used in social media and sometimes it can be overloo ked. Sometimes we mightRead MoreSocial Media And Its Impact On Society Essay1742 Words   |  7 PagesSocial media has gained immense popularity, following increased access to the internet and technology devices including smart phones. Social media is used to denote platforms in which people build and share social connections; thus enhancing information sharing and interaction. Major examples include Twitter, Facebook, YouTube, LinkedIn, Google+, Pinterest and Instagram. Through social media, people can connect, interact and exchange information such as pictures, videos and other digital media byRead MoreSocial Media And Its Impact On Society1563 Words   |  7 PagesSocial media has consumed our society. 47% of American adults used social networking sites in 2011 like Facebook, Myspace, and Twitter; up from 26% in 2008(quoted from procon.org) the aspects of social media both have a positive and negative impact on life. Social networking sites promote interaction with distant fami ly and friends. Social networking sites can demonstrate opportunities to strengthen existing relationships and to develop new friendships as well. The downfall of social media sitesRead MoreSocial Media And Its Impact On Society970 Words   |  4 Pagespiece titled Friends Indeed for the Washington Post. Garreau brings up possible dangers, minor inconveniences, and what truly defines a friend in the new media world we live in. I felt Garreau came across as jaded by most of the interviews he conducted. He did not seem to speak with a wide array of people that gave positive impacts social media can have, but rather focused on the negatives of the subject. Garreau did bring up valid points, however, from personal safety to the aspect of differentRead MoreThe Impact Of Social Media On Society987 Words   |  4 Pages The Negative Impact of Social Media on Society Marylin Vos Savant once said, â€Å"Email, instant messaging, and cell phones give us fabulous ability, but because we live and work in our own little worlds, that communication is totally disorganized†. The society we live in today requires modern technology. Texting, tweeting, and other forms of abbreviated communications are now changing how we speak. Of course technology and social media to be precise, is not necessarily evil; they have boosted the world’sRead MoreThe Impact Of Social Media On Society1652 Words   |  7 PagesIn 1968, popular artist Andy Warhol had brought to attention his opinion on the over-populated celebrity society of the time with his quote â€Å"In the future, everyone will be famous for fifteen minutes†. Times change, and the future approached, but Andy may have underestimated just how true that is. Nowadays, the quote has been translated to fit the modern times, â€Å"everyone will be famous for 15mb†. The quote being changed to that says a lot about the times that we are going through right now, whichRead MoreSocial Media And Its Impact On Society1224 Words   |  5 Pages Social media is a variety of platforms provided to the public as a medium for expression and communication. Seemingly, social media could be viewed as a positive contribution to society, but one must consider the underlying effects of society. Many of us don’t take into account the role that social media plays in the way we perceive things, think, and live our lives. Social media plays a critical part in societal norms. â€Å"Social norms are rules of conduct that governs interactions among individualsRead MoreSocial Media And Its Impact On Society Essay1560 Words   |  7 Pageswaiting for their next high, society has become more and more dependent on social media. One must realize, while the use of social media in today’s society is a necessity due to the fast-paced environment that has been created, it can never fully replace the value received from personal interaction with others. The short film titled, The Library Book, perfectly illustrates this as the charact ers within the film learn to assimilate in a society dominated by social media. The actions of each characterRead MoreSocial Media And Its Impact On Society Essay1622 Words   |  7 Pages What it Means to be Black In 2016, society is at a place where people are able to discover tons of information at the touch of a finger; this indeed can impact on how we view common things in society, such as identity. This statement holds true for â€Å"blacks† or African Americans as well. The stigma that comes with being black has been around for centuries; however, many blacks are using social media to combat negativity. In an era predicated on the use of the internet, black people have proven to

Low Voltage Effects on Ac Motors Free Essays

Low Voltage Effects on AC Motors A drop in voltage will result in a proportionate increase in current. If the current exceeds the nameplate rating and is not corrected, this can result in damage to the motor from overheating Nameplate Rating An electric motor will have a nameplate rating for both voltage and amperage. When a load is on a motor, the motor must draw a fixed amount of power. We will write a custom essay sample on Low Voltage Effects on Ac Motors or any similar topic only for you Order Now The required power is about equal to volts times amps. Should the voltage fall below the nameplate rating, the amperage will increase. This can result in increased heat that will shorten the motor’s life, according to Motorsanddrives. om. Torque The motor is subject to several kinds of torque. The starting or start-up torque is the amount present when the motor is stationary and power is applied. The pull-up torque is the minimum amount necessary for the motor during the starting sequence. Effects of Low Voltage on Torque A reduced amount of voltage will reduce the amount of torque. This can result in difficulty for start loads. A reduction of voltage to 80 percent would result in a torque value of only 64 percent. In light loads, a reduction in voltage may actually be preferable because it will result in increased efficiency. Even a small voltage unbalance will result in large current unbalance during the running of motor by a factor of 6 times. †¢ Negative phase sequence components will lead to heating of motor †¢ Negative phase sequence currents leads to reduction in motor output torque. †¢ Motor is forced to run at higher slip leading to increased rotor loss and reduced efficiency. †¢ Electricity boards should look in to this phenomenon seriously where irrigation pump sets suffer the voltage imbalance, even 1% loss of efficiency for the country like India would mean a great loss. HP irrigation pump sets with a quantity of 6 Lakh approximate, the loss of power would be 22MW and annual wastage of Rs. 47. 5 millions (At 3 Rs/unit, 4 Hrs of Pump working and 6 month’s season Keys to maximize the service life of industrial motors Why do motors fail? Certain components of motors degrade with time and operating stress. Electrical insulation weakens over time with exposure to voltage unbalance, over and under-voltage, voltage disturbances, and temperature. Contact between moving surfaces causes wear. Wear is affected by dirt, moisture, and corrosive fumes and is greatly accelerated when lubricant is misapplied, becomes overheated or contaminated, or is not replaced at regular intervals. When any components are degraded beyond the point of economical repair, the motor’s economic life is ended. For the smallest and least expensive motors, the motor is put out of service when a component such as a bearing fails. Depending upon type and replacement cost, larger motors—up to 20 or 50 horsepower (hp)—may be refurbished and get new bearings, but are usually scrapped after a winding burnout. Still larger and more expensive motors may be refurbished and rewound to extend life indefinitely. An economic analysis should always be completed prior to a motor’s failure to ensure that the appropriate repair/replace decision is made. Extend Motor Life with Improved Bearing Care Bearing failures are the root cause for the great majority of electric motor downtime, repair and replacement costs. Bearing and motor manufacturers are aware of the situation. Motor repair shops can attribute much of their business to bearing failures. And motor users see bearing failure as the fundamental cause of virtually every electric motor repair expense. Studies conducted by the Electrical Apparatus Service Association also demonstrate that bearing failures are by far the most common cause of motor failures. Knowing that shaft bearings are the Achilles’ heel of industrial electric motors is not a new idea in maintenance departments, but what is new is recognizing that something can be done to prevent most motor bearing failures. Factors Affecting Bearing Life Electric motors actually present a relatively easy duty for shaft bearings. The motor rotor is lightweight, yet because of its large shaft diameter, the bearings are large. For example, the bearings supporting the 140 lb. Rotor for a typical 40 hp. 1800 rpm industrial motor are so large that they have an L-10 minimum design fatigue life of 3000 years, or 10 percent of the bearings are statistically expected to fail from fatigue after 3000 years of operation. Plant operating experience, however, strongly contradicts such optimistic estimates of motor bearing life. In actual industrial environments, bearing failure is rarely caused by fatigue; it is caused by less-than-ideal lubrication. Because of contaminated lubrication, bearings fail well before they serve their theoretical fatigue life. There are many reasons for less than-ideal bearing lubrication. Lubricants can leak out; chemical attacks or thermal conditions can decompose or break down lubricants; lubricants can become contaminated with non-lubricants such as water, dust, or rust from the bearings themselves. These lubrication problems can be eliminated. Motor bearings can last virtually forever by simply providing an ideal contamination-free, well-lubricated bearing environment. Conventional wisdom teaches that such an ideal motor bearing environment can be provided by using a dry-running lip seal or using sealed (lubricated-for-life) bearings. Indeed, for many light-duty applications, such bearing protection techniques are often sufficient to allow bearings to last as long as the equipment itself. However, these bearing protection methods have not significantly reduced the rate of bearing failure in severe-duty industrial motors. Bearings in industrial applications continue to fail because of inadequate lubrication caused by lubricant loss, contamination, and decomposition and break-down. Lip seals invariably wear out well before the bearing fails, and sealed bearings inherently foreshorten the life of a bearing to the service life of the contained grease (usually only about 3,000 to 5,000 hours for most industrial services). Maintenance professionals may find the following suggestions on how to forestall motor hearing failure obvious, but some new techniques and technologies are available. Lubricate Bearing at Correct Intervals Despite years of warnings from bearing manufacturers, over lubrication continues to plague many motor bearings. Too much grease can cause overheating of the bearings. The lubrication instructions supplied by the motor manufacturer will specify the quantity and frequency of lubrication. Generally, two-pole motors should be greased twice a year, four-pole and slower motors only once a year. Use the Best Available Grease The most commonly used bearing grease is polyurea-based, a low-cost, low-performance, highly compatible lubricant. However, it does not handle water well, a serious drawback for many industrial applications. It reacts readily with water and loses its ability to lubricate bearings. Industrial motor bearings should be lubricated with a synthetic-based aluminum complex grease. A high-quality grease pays for its additional cost in reduced motor downtime and repair costs. Keep Out Moisture Unless the motor is being hosed down or it operates in a humid environment, reasonably shielded motor bearings may not become seriously contaminated with moisture while the motor is running. However, when the rotor is shut down, moisture and condensation can collect on the surface of the bearing components. Eventually, this water breaks through the oil and grease barrier, contacts the metal parts of the bearing, and produces tiny particles of iron oxide. These rust particles make an excellent grinding compound when mixed with the grease. resulting in premature failure of the bearing because of surface degradation. Preventing water contamination is a major challenge to bearing housing design. Close shaft-to-endbell clearances cannot stop the movement of humid air. Contact seals will quit contacting, resulting in large gaps that allow movement of air and water vapor across the bearing. Vapor-blocking bearing isolators, such as the one illustrated, are among the more successful devices presently available to prevent water vapor from entering a stationary bearing. When the motor shaft is rotating, the isolator opens, eliminating the possibility of friction and wear. However, when the shaft is stationary, the isolator closes, preventing movement of air or water across its face. With no wear from rotating friction, the seal may last indefinitely, and surely as long as the fatigue-failure life of the bearing. Keep Out Dirt Lip seals, contact seals, and frequent grease replacement help minimize the amount of dirt and other air-borne abrasives that can contaminate bearing lubricant. These solutions, however, have some drawbacks. Lip seals have a short service life, and frequent grease displacement is expensive and messy. One successful approach to keeping air-borne dirt and liquids out of an operating bearing is to install a labyrinth-type non-contact seal over the bearing housing. These bearing isolators, readily available from suppliers, combine a tortuous labyrinth path with impingement and centrifugal forces to trap and remove air-borne dirt and liquid; virtually no contamination can reach the bearing. Because the bearing isolator is a non-contact device, it will generally be the longest-lasting component of the motor. Although not intended as such, a bearing isolator could serve as an emergency sleeve bearing if the primary bearing fails, possibly preventing damage to the motor’s stator and rotor. In emergency situations, the bearing isolator can allow continued operation for a short time and still prevent the need to rewind the motor when the bearing is replaced. Bearing isolators constructed of bronze or other non-sparking materials also can prevent hazardous sparks that could otherwise occur when the bearing’s rolling elements fail. Other Suggestions Improved bearing protection and lubrication will reduce downtime and the maintenance costs of electric motors, but other important motor design features contribute to long service life, including over-sized high quality bearings, high-tech winding insulation, superior fan design, high-performance paint (such as epoxy) and a strong, rigid cast iron frame. These features, usually standard or readily available, are found in most industrial-grade severe-duty electric motors. High-performance bearing protection systems. however, are not universally accepted as essential for long motor life. Specifying permanent bearing protection for new motors, or retrofitting isolators onto existing equipment, usually requires initiative on the part of the user’s maintenance or engineering staff. Permanent, absolute bearing protection has a greater effect on motor life than any other decisions made in specifying, equipping, and caring for electric motors. Keeping bearings lubricated with the right amount of clean, uncontaminated, high-quality lubricant allows bearings in most industrial motors to outlast all other motor components. How to cite Low Voltage Effects on Ac Motors, Papers

Volcanos Essay Example For Students

Volcanos Essay Volcanos occur all over the world.The best know volcano zones occur on the destructive plate margin around the Pacific Ring of Fire.This chain of volcanos that lie along the west coast of central and south America,Japan and the Philippines,across New Zealand and into the Atlantic.Volcanos also occur in mid-ocean along the line of ocean ridges.The Mid-Atlantic Ridge is an example of ocean floor volcanos.When these volcanos erupt lava flows from the cracks building up the ocean floor.Volcanos can also occur away from plate boundaries.These are the Hawaiian Volcanos.As you can see there are lots of places were volcanos occur.Sometimes these volcanos are where humans have settled.To help protect our belongings and save human lives we have developed ways to predict when volcanos are about to erupt.Here are some. PredictionsTwo main methods are used to predict when volcanos are about to erupt.These methods are called geophysical techniques,and chemical techniques. The geophysical method can detect any changes in the rock below.As the magma rises it forces the rocks apart,Which can create minor earthquakes on and or around the mountain.These can be detected on a seismographs.A seismograph picks up the seismic waves the earthquake gives off and records them.A seismograph works by a pen and a weight suspended on a spring.As the earth shakes the pen writes the waves,called a seismogram,on a revolving drum.A comparison can be used.They take two or more seismographs readings to pin point exactly where the magma is trying to surface.This technique is successful in Hawaii where they are a lot of volcanos.The place and the time of eruptions have been forecast accurately.Before a volcano is about to explode the ground around it swells with magma.This causes the ground to start to tilt.The tilt can be measured by an instrument called a tiltmeter.Two containers are half filled with water.And a tube connects the two.As magma rises and changes the a!ngle of the earth.Water goes into the lower container.Scientist can tell if the volcano is getting more active.When magma moves its gravity changes.This change in gravity can be detected by using gravimeters.When rock is heated to a certain temperature.It looses its magnetism.And this can be detected with a magnetometer.When magma rises to the surface it gives off heat.This heat can be detected with a intfa-red temperature surveys.Sometimes chemical methods are used.They measure the volcanic gases at hit springs and at fumaroles which are openings in the ground were gases escape from.Just before a volcano is about to erupt there is an increase in certain gases.These gases are chlorine compounds,sulphor oxides,carbon dioxide,hydrogen, and radon. DamagesWhen a volcano erupts huge amounts of lava are spewed out of the volcano.These huge flows of lava can wipe out towns.This type of volcanic eruption is called Hawaiian.These volcanos put on fire shows .They are rarely violent or explosive ,because the lava is fluid enough to let the gases escape easily.The lava flows out of boccas.These volcanos are not really dangerous.But they can cause alot of damage if people or buildings get in its way.A strombolian eruptions are more violent producing a lot thicker lava.Because the lava is thicker the gas can not escape easily from it making the lava hostile.The plinain eruptions ar the most dangerous .They hurl huge amounts of pumice as high as fifty kilometers into the atmosphere.Then is ash falls over wide areas.Then this is followed by pyoclastic flows,where hot gases and ash pour out of the vent.These flows rush across the landscape ,burning and burying anything in its path.This is the eruption that happened to Mount St. Helen in th! e U.S.A. Wisps of steam were coming out of the vents on the side of the mountain.During a period of several weeks a three hundred foot high wedge shaped bulge developed on the south side of the mountain as a result of rock and ice being pushed up.There were gaping cracks in the glaciers.They were gray with a dusting in volcanic ash.Weeks later the bulge blew sending ash and mud slides down the mountain wiping any thing that got in its way.The eruption cause a lot of damage.It created the worlds biggest clear cut.Two hundred and thirty square miles of trees lay in a tangled mess after the eruption.But people were trying to save as much of the lumber as they could.They were hauling out Five hundred loads a day of the fallen trees.But of all those able to be salvaged one point eight billion board feet of timber was destroyed.The eruption also took out some human life.Sixty five people were killed in the eruption.But the most damage was done to the surrounding wildlife.Five thou!sand wh ite tailed deer were killed,One thousand five hundred elk,two hundred black bears,fifteen mountains goats,plus unknown numbers of mountain lions,bobcats,small rodents,birds,fish,and insects were also killed.The whole population of spotted owls were completely wiped out.That was some things that can happen here are some more.Ash can bury structures and cause people to suffocate or if ash mixes with water it creates huge mud flows that race down mountain sides,clogging rivers.Hot chucks of lava and ash can start fires far from the lava flows.The earthquakes that accompany the eruptions can destroy buildings.The value of the damage consists of how bad the eruption was and if it was near any civilization.A very bad eruption near a city can cause millions and millions of dollars of damage and a great loss of lives. Even a small eruption with a lot of lava flow can cause millions of dollars of damage.If a volcano out in the wilderness explodes .The value of the damage can dif!fer.From how much value you place on the wildlife and trees.When Mount St. Helen exploded ash from the volcano clogged major rivers.The rivers were the Toutle and Cowlitz.The U.S Army Corps of Engineers took the task to unclog it.The cost of this was a quarter of a billion dollar.This gives you an idea how much money it costs to fix something damaged by a volcano. .u1b5ce51abc00fd59b59b26421c756429 , .u1b5ce51abc00fd59b59b26421c756429 .postImageUrl , .u1b5ce51abc00fd59b59b26421c756429 .centered-text-area { min-height: 80px; position: relative; } .u1b5ce51abc00fd59b59b26421c756429 , .u1b5ce51abc00fd59b59b26421c756429:hover , .u1b5ce51abc00fd59b59b26421c756429:visited , .u1b5ce51abc00fd59b59b26421c756429:active { border:0!important; } .u1b5ce51abc00fd59b59b26421c756429 .clearfix:after { content: ""; display: table; clear: both; } .u1b5ce51abc00fd59b59b26421c756429 { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .u1b5ce51abc00fd59b59b26421c756429:active , .u1b5ce51abc00fd59b59b26421c756429:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .u1b5ce51abc00fd59b59b26421c756429 .centered-text-area { width: 100%; position: relative ; } .u1b5ce51abc00fd59b59b26421c756429 .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u1b5ce51abc00fd59b59b26421c756429 .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u1b5ce51abc00fd59b59b26421c756429 .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u1b5ce51abc00fd59b59b26421c756429:hover .ctaButton { background-color: #34495E!important; } .u1b5ce51abc00fd59b59b26421c756429 .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .u1b5ce51abc00fd59b59b26421c756429 .u1b5ce51abc00fd59b59b26421c756429-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u1b5ce51abc00fd59b59b26421c756429:after { content: ""; display: block; clear: both; } READ: Oppenheimer and The ATomic Bomb EssayPrecautionsBecause we sometimes have to live near volcanos.We have to take some precautions in case they ever erupt.All new buildings being built in the vicinity of volcanos should be earthquake proof .Mud flows,landslides,and lava can cause a lot of damage.There for dams and public buildings should be located so they dont get destroyed by these forces.People should be aware of the warning signs of a volcano ,earthquakes and ash being spewed out.They should what to do if they have to leave the town quickly in case the volcano does blow. Reference sorces-The World Book Encyclopedia 18 pg223We watched Mount St. Helen blow its toppg54-55,Mount St. Helen 721-727,Volcanos and Earthquakes pg23-43,Science Dimensions pg236-237