Smog Pollution in Beijing Essay - 2602 Words

Smog pollution in Beijing Smog pollution has been around since the start of industrialization, and there are many cities that suffer from its consequences. Among them, Beijing is singled out as the hotspot these days. In the past winter, an unprecedented amount of smog cloaked Beijing, filling the city with noxious air and causing convulsive coughing among the local residents. Not only does smog cause inconvenience in transportation by reducing visibility, but also, according to a study at UC Berkeley, smog has a huge impact on people’s health: â€Å"people living in the smoggiest cities were 30 percent more likely to have succumbed to lung diseases such as chronic bronchitis, emphysema and pneumonia.† In his essay, â€Å"The Tragedy of The†¦show more content†¦Technology helped to improve the population limit from around 60 million in the 1400s to more than 700 million in the 2000s. Now, the world is crowded. 7 billion people might seem to be a big number com pared to the available space on the earth, but it is negligible compared to the whole universe. With the advancement of technology, people might be able to expand the commons further to other planets. This is not unreasonable. 100 years ago people were not able to send man to the sky using airplane. But 40 years ago, the first man was sent to the Moon. Who knows if people are going to reside on Mars 50 years from now with the help of technology? As history demonstrates, Hardin’s idea is problematic in that he treats the commons as something static and immobile. To him, the total population is limited by L/A, and the more each person consumes, the less population the commons could afford. This is only true if L and A are constants, but unfortunately they are not. Technical solutions do exist because technology could enlarge the commons (increasing L), and increases the efficiency of utilizing the commons (reducing A). With the ceaseless advancement of technology, the limits of population, pollution, and anything that could be categorized as a â€Å"tragedy of the commons† is pushed to infinity just as P=L/A approaches infinity mathematically when L keeps increasing and A decreasing. TheShow MoreRelatedAir Pollution Of Beijing And China1315 Words   |  6 Pagesthe past few years, the air pollution in Beijing becomes more and more serious. Frequent smog weather cause social disordered and serious harm to the health of residents. The number of respiratory diseases increased. Citizens live in a bad living condition. Because of the smog, we have to stop all outdoor works and activities. It also caused great economic losses. So we must do some thing to control the air pollution. Keywords: air pollution, control measures, Beijing Introduction: As is well knownRead MoreAir Pollution in My Hometown1387 Words   |  6 Pages In the past few months, my hometown has suffered severe air pollution problems. The smog caused by pollution has existed for years in major cities in China, including Beijing, Shanghai and my hometown. Most of urban areas in middle and northern China are struggling with air pollution, even some tropical regions could be affected. Surrounded by the fantastic fresh air in Seattle, I felt frustrated about the bad pollution problems in China. Every time I enjoy the beautiful skyline and sunshine inRead MoreSmog Of Chin Pollution1250 Words   |  5 PagesENG 215 Quinton Wu Third draft Smog in China China is the second-largest producer of greenhouse gas, acid rain and other pollutants in the world. That means China has lots of environmental problems, and air pollution always is one of the most serious issue in China. 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There are many ways that we can stop pollution about but we just don’t really take matter of it, if people will just observe how pollution is affecting the environmentRead MorePollution Is A Serious Problem?1320 Words   |  6 PagesXiangyu Li Professor Kei Lutalo English 1106 6 March 2016 pollution in china In the paper, I argue that what types of pollution in china by introducing the situation and problems in china. Following the development of economic and scientific, China is playing a very important role in the international arena. Increasing the number of people become rich. they can buy the new car, big house, and expensive clothes. In many people s opinions that China is becoming strong and rich. But they do notRead MoreChina s Economic Reforms Increase The Economic Output954 Words   |  4 Pagesfailed to meet the national air quality requirement. 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This film deeply investigated the air pollution in different cities in China, combined footages of her interview with authorities whoRead MoreAnalysis Of Michael Auslins The Filth They Breathe In China747 Words   |  3 Pageseffects of pollution are most prominent, China. In his article, Auslin, uses anecdotes, uses strong diction, and uses appeals to logic and credibility in order to capture the enormity of China’s pollution problem. Auslin recounts specific stories of his numerous trips to China to express the magnitude of the effect pollution has on everyday life. The author vividly remembers his first-hand experience with the smog in China, sharing with his audience that on â€Å"one of my first trips to Beijing, as ourRead MoreHow Pollution Affects The People Of Beijing777 Words   |  4 PagesIntroduction Pollution in Beijing has exceeded the ‘Very unhealthy’ alert and is now rated unlivable. People in Beijing are advised to avoid going outside wherever possible. Good morning/afternoon everyone. I m here today to raise awareness about air pollution in Beijing, the capital city of china. What is Pollution? Pollution is defined as the process of harmful substances being released into the air. Some of these substances include Carbon Monoxide, Sulphur dioxide, Lead and PM2.5. PM2.5 is smallRead MoreChina s Massive Pollution Problem918 Words   |  4 Pagesâ€Å"Air pollution is defined as any substances absorb into atmosphere, and these substances harm the living things and environment† (Dictionary). As dictionary mentioned, during development of the Beijing for 10 years, air has been contaminated by emission of gases and smog from industrial factories whose number has been increasing. A number of particles and dusts damage to people’s health and their life style. People are always concerning about daily concentration of particles. Even though they struggle

Peyton Farquar in The Occurance at Owl Creek Bridge

How many people would truly die for another person? Or harder yet, die for a cause? Many would say no, the task is too difficult, it’s too much to ask a person to do. And who can blame those who believe that? After all, death is absolutely final and irreversible, to die for an idea might seem like a complete impossibility. But there are a selective few who would bravely do what they believe right, even when the consequences may be terrible. Rosa Parks is an amazing example of standing up for the cause. She knew she was supposed to hand over her seat to a white man. She knew that the aftermath of such an act at that time was punishable by jail time. And she did it anyway, for the dream of equal rights to all, no matter the race, color,†¦show more content†¦Why was everything suddenly so marvelous? It was almost as though he were being reborn all of a sudden. In the end, after we find out he actually dies, we see why his surroundings and senses were so unnatural. It was because, knowing he was going to die, everything he might have taken for granted, seemed absolutely marvelous to him. Small, seemingly insignificant things, things he would never again see or experience, now seemed like the world to him. These were things that would never be at his reach again. So, his imagination gives Peyton his last and best view of his world. Because his sacrifice cost him his life. Through the events of his daydream, one could say he’s a dynamic character. But did he really develop? What were the changes to him? How did they come about? In my eyes, Peyton Farquhar is a static character. After all, what does he experience? what occurrence makes him evolve in some way? Nothing. Oh, but he dreamed and escaped and saw the world in a different perspective than before! This is change! you exclaim. The key word in this statement is dreamed. The last sentence of this story is, â€Å"Peyton Farquhar was dead; his body, with a broken neck, swung from side to sid e beneath the timbers of the Owl Creek Bridge.† So this entire escape ends up being nothing more than a desperate daydream of his. Which means none of it happened. Payton stays in one place. Nothing happened during his waiting time for

Pre-Tensioning in Civil Engineering Free Essays

Introduction : The idea of pre tensioning has been around for centuries and has been applied to many forms, such as: wagon wheels, wooden barrels etc. In these cases heated metal is made to just fit an object. When the metal cools it contracts and induces prestress into the object thereby strengthening it. We will write a custom essay sample on Pre-Tensioning in Civil Engineering or any similar topic only for you Order Now The idea of pretensioned concrete has been around since the late 19th century, but its use was limited by the quality of materials available at the time. It wasn’t until the 1920s that materials of a suitable quality were available in sufficient quantity to allow pretensioned concrete to be used with confidence. The pioneers of this field were Freyssinet, Magnel and Hoyer. Description: In pre-tensioned concrete tensile elements such as cables, ribbons, or rods are clamped under calculated tensile stress (Stage 1). Concrete is cast around these elements and allowed to cure( Stage 2). When fully hardened the clamps are released and the stress is transferred within the rigid concrete (stage 3). As long as a load is applied within the design limit, the concrete structural element will never be subjected to tensile stress of sufficient force to cause failure. Pre-tensioning can be used in pre-cast as well as in cast-in-place construction. Most of the pre-tensioning construction techniques are patented although the basic principle used in all of them is common and is well known. Hard drawn steel wires which are indented or crimped are preferred for pre-tensioned elements because of their superior bond characteristics. Small diameter wires of 2 to 5 mm are mostly used in the form of strands comprising two, three or seven wires. High Strength Concrete mix: Pre-stressed concrete requires concrete which has a high compressive strength, with comparatively higher tensile strength. Low shrinkage, minimum creep characteristics and a high value of Young’s modulus are generally deemed necessary for concrete used for prestressed members. Uses: Common uses include Railway Sleepers, Communications Poles, Pretensioned Precast â€Å" Hollowcore† slabs, Pretensioned Precast Double T units –for very long spans, Pretensioned precast inverted T beams – for short-span bridges, Pretensioned precast PSC piles, Pretensioned precast portal frames. Alternatives: The alternative to pre-tensioning is post-tensioning. In a post-tensioned beam, the tendons are stressed and each end is anchored to the concrete section after the concrete has been cast and has attained sufficient strength to safely withstand the prestressing force. In the posttensioning method, tendons are encased in a duct or sheath or coated with grease or a bituminous material before placing them in the formwork to prevent them from becoming bonded to concrete. Advantages: Prestressed concrete has the following advantages 1. Since the technique of prestressing eliminates cracking of concrete under all stage of loading, the entire section of the structure takes part in resisting the external load. In contrast to this, in reinforced concrete, only the portion of the concrete above neutral axis is effective. 2. Since the concrete does not crack, the possibility of steel to rust and of concrete to deteriorate is minimized. 3. Absence of cracks results in higher capacity of the structure to bear reversal of stresses, impact, vibration and shock. 4. In prestressed concrete beams, dead loads are practically neutralized. The reactions required are therefore much smaller than required in reinforced concrete. The reduced dead load weight of the structure results in savings in the cost of foundations. The neutralization of dead load is of importance in large bridges. 5. The use of curved tendons and the pre-compression of concrete helps to resist shea r. 6. The quantity of steel required for prestressing is about 1/3 of that required for reinforced concrete, although the steel for the former should have high tensile strength. 7. In prestressed concrete, precast blocks and elements can be assumed and used as one unit. This saves in the cost of shuttering and centering for large structures. 9. Prestressed concrete can be used with advantage in all those structures where tension develops, such as tie and suspender of a bow string girder, railway sleepers, electric poles, etc. 10. Prestressed concrete beams usually have low deflection. How to cite Pre-Tensioning in Civil Engineering, Essay examples