Why Is Paper Recycling Important Environmental Sciences Essay

Why Is Paper Recycling Important Environmental Sciences Essay The large amount of paper waste being generated in the past years has really being a great concern to the society, the disposal and treatment process involved in paper waste had being on the increase, Richard A. Venditti (1992) said 37% by weight of Municipal Solid waste are being generated are gotten from paper, but as at Due to this large amount of the paper waste being produced by homes, industries and office, recycling of the paper waste technology has help in the reduction of the total amount of waste being put in the landfill and also help in the reduction of high dependence of raw materials for paper production from plants(vegetable fibers) which in turns help in the reduction of the way tress are being cut for paper production thereby preserving our environment and also reduces energy use and CO2 and Methane emission compaired to the normal production procress from plants The recycling of paper waste which majorly gets it raw materials from: Mill broke ( paper scrap from paper production), Pre consumer waste ( paper being discarded before usage by consumers) and post consumer waste(paper being discarded after use), has helped in the reduction of deforestation. Due to the source of raw material for paper being produced by recycling there is high dependence of paper being produced from recycling paper, Paper online said that 90% newspaper are printed on recycle paper,90% corrugated boxes are made from recycle fiber and 54% of fibres which are being used in new paper and board are gotten from recycled paper Europe has being the leading recycling of paper in the world, studies has shown that more than 60 tonnes of paper of paper are being collected per year and still on the increase which has exceed 60%of the paper consumed since 2005 (Paper online) Paper Recycling is mainly the processing of waste paper into new paper product. Waste paper, which are majorly gotten for offices, homes and industries are being taken to the recycle bank by local authorises and then collected and processed into paper related product. Recycling of waste paper has affected the environment in a positive way by the reduction in the dependence of plant for raw materials for paper production which is vegetable fibers gotten from plants. Recycling of waste paper gets its raw materials from three catergories,   Mill broke (paper trimmings and other paper scrap from the manufacture of paper, and is recycled internally in a paper mill),   Pre-consumer waste(is material which left the paper mill, which has been discarded before it was ready for consumer use) and   Post-consumer waste (waste is material discarded after consumer use, such as old magazines, old newspapers, office waste, old telephone directories, and residential mixed paper) Debunking the M yths of Recycled Paper Pre recycling Technology involved in paper recycling The technology involved in paper recycling involves majorly five step after collection of waste from the waste bank. The Seven steps which are, Pick up form home offices and business, Sorting to remove contaminants, Re-pulping which invovles blending of d sorting with water and chemicals, Filtering to remove scraps and impurites, De-Inking by use of soapy chemicals, Draining of the water, Drying by the use of heat and Rolling and Packing of the produced paper. I will be looking at each of this steps individually in my report. Pick up General waste from Homes, officesRecycling actually starts from our homes, offices and business, where we separate the type of waste to be disposed by putting them in specific disposal bags and bins ready for collection. The waste bin (the recyclable bin) which has the paper content inside are being collected by local collection agents and then transported to the recycle bank where it is being sorted out and read for recycling Paper Recycling Recycle Bank Recyclable waste Pick up by local agent Non-Recyclable waste Sorting to remove contaminants Sorting is majorly done by the use of recycling sorting line (RSL) in the recycle bank. The recycling sorting line sorts out the recyclable materials gotten from home into different recyclable materials(like paper, plastic, plastic, cans) and are then sold to different recyclers. The recycling sorting line can be fully or partially automated or can involve manual sorting. In the automated system the RSL separates the recyclables in terms of their density, size, and chemical composition it uses specific properties of separation equipment (like , trommels, density sorters, and magnetic separators) to separate the recyclables into different categories. The combination of both manual sorting and the automated sorting give a very high efficiency sorting system. Trommels : this separation equipment is being made up of different screen hole sizes at the outer part of the equipment. The screen size gets larger as the through the length of the screen allowing the recyclables be separated according to size. Density sorters: this separation equipments used density of the recyclables for d separation process by the use of air knife which produces controlled air stream with a specific velocity so as to blow the lighter recyclables like plastic, cans or paper into a collection chamber depending on the air stream velocity. Magnetic separators : This is majorly the use of eddy current as a means of separating of ferrous metals like   aluminium which are being lifted away from the recyclable mixtures. Conveyer belt: this is mainly used during manual sorting, where the recyclables materials moves through the conveyer belt and it is being manually sorted through hand picking by workers. (www.p2sustainabilitylibrary.mil/p2/7_III_8) After sorting they are then baled and being sold to the very recycler for the recycling of their various components. The baled waste paper are then taken to the paper mill for the recycling. Re-pulping The baled paper waste are then slide into different sizes and then transfer in a pulper for it to get mixed with water and chemical. Contained in the pulper is a mixture of water and dipolar aprotic protophylic solvent{1}. The water being used IN this mixture is being   optimized to get a tetrahedral lattice of natural hydrogen-oxygen-hydrogen angles through the rearrangement of its hydrogen bonding system. Due to the aptimization of the water components the water structure develops properties of smaller cluster pattern, lower surface tension, increased dissolving powers, higher carrying efficiency, microbiological stability and greater reactivity(1) which determines the characterises of the final pulp being produced. Mixing of this water optimized water with dipolar aprotic protophylic solvent would produce an aqueous solution of dipolar aprotic protophylic solvent. The aqueous solution is then mixed in the paper waste in the pupler until a  stereochemical alterations occurs with the waste paper which cause a full repulping of the paper waste. The aqueous solution is then drained away from the pulper after the completion of the process and the prodced pulp from the paper waste is removed out of the pulper afterways. The repulping of the paper waste forms a pulp(i.e the paper waste then forms a pulp). A pulper is majorly a mixing tank which contain a pulp feeder(which is used to feed the waste paper, water and the chemical into d pulper), turbine impeller , a mixer (which is being driven by a motor to ensure proper mixing), sieve plates ( to ensure that no undiluted particule leaves the pupler) (http://www.lenzing.com/technik/en/fiberandpulptechnology/2085.jsp) Filtering After the pulp has being extracted from the pulper its then being filtered and cleaned so as to remove impurities (like waxy coatings, heavy inks, non wood-based fillers, glue,ink) present in the pulp. Screening is the major process involved here, which involoves the use of sieves of different sizes together with centrifugal cleaning system are being used. Sieved sizes screens are being arrangement in parallel at forming different layer of stages. The pulp is then being passed through the sieves which would filter of the unwanted imputires thereby producing the pure required pulp needed. De-Inking This is majorly the removal of printed ink from the paper fibers by the use of soapy chemicals which involves both mechanical and chemical process. The chemical and mechanical process are mostly called flotation and wash deinking. Flotation process involves the transfer of the pulp into the froth flotation cell in which the sopy chemical is then added in the cell. The froth flotation cell mostly operate 45 550c. Air is then blowed through the pulp thereby causing the air to get attached to the ink present in the pulp and then its being left up away from the pulp and suspend at the top of the chemical .the flotation cell consist of two cylindrical flotation cell with both have an overflow forth launder and hexagonal in shape an inlet and discharge box attached to the cell.

Child Play

Play and early childhood education is not just a way to fill time for children who are too young to go to school. Some people think of play as the â€Å"work† of children (Berger, 2000). Through play and early childhood education, children build the foundation for later learning as they solve problems and increase their understanding of themselves, other people, and the world around them. Being in a stimulating environment, such as an early childhood center, provides a child with the much needed support to develop skills for dealing with emotions, expanding language and vocabulary, and an array of other skills.Putting children in environments where they are not stimulated can be harmful to their development during the play years. For young children, â€Å"play† includes a variety of activities that are fun and interesting. These activities include quiet play, creative play, active play, dramatic play, games, and manipulative play. Play may be structured or unstructured. Structured play has rules or a specific way of doing things. Games such as active games, card games, and board games are examples of structured play. Unstructured play includes activities such as dress-up play, doll play, building blocks, running and climbing, and riding tricycles.These activities are sociodramatic and rough-and-tumble play (Berger, 2000). A child may play alone or engage in social play by including other children or adults. Social play has a critical role in helping children learn to interact with others. Some research has identified stages of social play. Children pass through these stages as they grow, becoming capable of more interactive play as they develop. According to Berger, Onlooker play occurs when a child seems to be playing alone while watching others’ play activities.Solitary play occurs when a child plays alone or near another child with no interaction between them. Berger states that Parallel play refers to children’s play when they ar e near each other and using similar materials but with little or no social interaction. Associative play is similar to parallel play but involves some social interaction. Cooperative play includes common goals and collaboration, and may involve complex negotiation, collaborative decision making, and rule setting (Berger, 2000). While we were at the VCU child development center, I witnessed children playing outdoors.I saw some cooperative play in games such as hide-n-seek and duck-duck-goose, where the children played the games by rules that were taught to them. Most of the play witnessed was unstructured play in which the children decided what the wanted to do and how they wanted to do it. One little boy sat in solitary play building mini castles out of sand, while another large group of children just ran in circles around the playground screaming. Many kids just sat back and watched as others played games, while they sat in the sand box occasionally scooping sand which demonstrated onlooker play.Lastly, a group of children sat in a corner observing flowers or bushes having conversation about them, which demonstrated associative play Children’s play sometimes has less to do with other people than with finding out about the world. Young children naturally explore their environments in playful ways that help them understand the physical environment and their own bodies. This type of play is sometimes called sensorimotor play. As they vary their actions and interact with toys and other objects, children discover what their own muscles can do, and they gain practice of the movements that they need for everyday life.They also have affordances to learn about gravity and other principles of the physical world. What children learn through play is also very much affected by the quality of the early education care program that they are in. When searching for child care, every parent wants to leave their child knowing that they are handled by a warm, nurturing adu lt, who has knowledge of how children grow and develop. The adult should also have an understanding of the needs and interests of individual children because this is essential for a child’s growth.Children should be valued for themselves and not for what they do or how they look. Good caregivers tend to view children positively and help them learn what to do rather than focusing on what not to do. They help children learn to take responsibility for their own actions and eventually develop self-discipline. Rules should be reasonable, consistent, and well explained. Children are treated with respect. When caregivers view themselves positively and feel good about their work, they model a good self-image for the children. It is essential for caregivers and teachers to help parents feel a part of the program.The parents and school teachers should share information in order to understand more fully a child's needs and provide the best coordinated twenty-four-hour schedules for the child. Parents can share important family values, goals for their child, methods of discipline, and changes in the child's home environment while teachers can share the program goals, special activities for the child, weekly plans, and how they believe children learn (Azria-Evans). Teachers also can utilize appropriate community resources for the school and help parents find needed resources. Good relationships among staff members are important.If the children see adults working together cooperatively and solving problems successfully, they will learn to use some of these skills. All staff members must maintain professional ethics, which includes protecting the privacy of the children and families in their program. Centers also are required to go through a process to make sure they are meeting state standards. Licensing of child-care centers and family child-care homes gives parents some protection. States vary in their requirements for the facilities and the staff, criminal clearan ce of caregivers, health and safely regulations, and child-adult ratios (Azria-Evans).The adult-to-child ratio affects the individual attention given to each child and the group size affects the interactions of children. Ages of children are followed by adult-to-child ratio and group size (Azria-Evans). Multi-age grouping is permissible and often encouraged. The adult-to-child ratio and group size requirements are based on the age of the majority of children, but when infants are included, ratios and group size for the infants must be maintained. Child care center may also choose to attain an additional certification through The National Association for Education of Young Children (Azria-Evans).By getting this certification a child care center shows that they have gone above and beyond state standards to provide the best care and learning environment for children. Along with that the center should be a good fit for the parent and child (Azria-Evans). It is essential that parents vis it a center and talk with the director, teachers, and children before enrolling their child there. The child should also visit the program before being enrolled. The school should welcome unannounced visits. The parents must check for safety in the total environment.Is the equipment appropriate and in good condition? Are gates latched so children cannot get out? Are activities well supervised? There should be a variety of developmentally and culturally appropriate activities as well as equipment and materials so that each child can develop in all areas such as: physical, social, intellectual, emotional, and creative. Physical development includes large and small motor skills and health issues. Particular attention should be paid to routines such as eating, toileting, and resting. Intellectual development involves the cquisition of language skills as well as general knowledge about one's â€Å"world† and how to function in daily tasks. Children need opportunities to play and w ork with other children as well as to play and work alone. Activities should be balanced between active and quiet play both indoors and outdoors. Some activities should be teacher-directed while others should be selected by the child. The transition times between activities should be relaxed and provide pleasant learning experiences. Learning centers should reflect children's families, cultures, and interests.Learning centers should include table-top activities with manipulative materials, activities with housekeeping props, dramatic play, books and quiet corner, music and movement, art and creative activities, cooking and science areas, and a block area. Look for outdoor climbing equipment, space to run, wheel toys, sensory motor activities such as obstacle courses, balls, beanbags, and hoops. Children need carpentry, gardening, and ample sand, water, and mud play. There should be nature walks and trips away from the center.At the VCU child development center the children had built a replica of New York City, with demonstrated a table-top activity. Outdoors the play area had two wooden playhouses, and the entire play area had little garden throughout. There was also a sand pit in the middle of the playground. The arrangements families make for their children can vary dramatically, including care by relatives; center-based care, including preschool early education programs; family child care provided in the caregiver’s home; and care provided in the child’s home by nannies or babysitters.How a family chooses this care is influenced by family values, affordability, and availability. For many families, high-quality child care is not affordable, which results in compromises. The benefits of high quality care are that when care is consistent, developmentally sound, and emotionally supportive, there is a positive effect on the child and the family. The children that are in a poor quality environment are less likely to be prepared for school demands an d more likely to have some development problems, which sometimes can not be fixed.These include reading and language problems, because the children have not been in a nurturing environment to develop these skills. These students are more likely to fall behind in school. All in all, the play years are essential to a child’s development. The type of play that they do and the child care center that they attend is very important in determining how a child develops. A lot of thought should go into choosing a child care center, because we all want our children to get the proper amount of play for their age group to make sure the develop the skills needed later on in life.

The Physics of a Truss Bridge

There is many reason that we need bridges in every day of our life, from sufficient means to pass over a roadway, waterway, railway, or other structure. You don’t even think about them because it takes no effort to get over them and they are just there for your use. So if you don’t think of them for everyday use I highly doubt that you would think of the physics that is involved in putting one together or the kind of force the bridge can actually take.I am going to show you the max force a truss bridge can take by demonstration it to you in class and also by trying to calculate it. I am also going to go over the many ways that truss bridges can fail and come to a tumbling crash. Before I get into the physics of the bridge you need to know what a truss bridge is and how it works. A truss is a structure composed of members connected together to form a rigid framework. Members are the load-carrying components of a structure. In most trusses, members are arranged in interco nnected triangles, as shown below.Because of this configuration, truss members carry load primarily in tension and compression. Because trusses are very strong for their weight, they are often used to span long distances. They have been used extensively in bridges since the early 19th century; however, truss bridges have become somewhat less common in recent years. Today trusses are often used in the roofs of buildings and stadiums, in towers, construction cranes, and many similar structures and machines. An easy way to understand how a truss bridge works is to use a nutcracker and a sting tied to the ends of the nutcracker.So even if you push down on the nutcracker it will not move or slide on the table. This is because the nutcracker is in equilibrium. I am going to show you a little of a harder way of calculating it with three triangles that are in the shape of a truss bridge so you can understand how the bridge works 400N 800N A B C D E 2m 500 N 700 N Sum of torques = (1m) (-400 N) + (3m) (-800N) + (4m) (E) =0 E= 700N Sum of forces = Ay +E -400N- 800N Ay = 500N Now that we know how the forces are laid out, let’s take a look at what is happening at point A.Remember that all forces are in equilibrium, so they must add up to zero. 500N 60Â ° A T Ac T AB Sum of Fx = Tac + Tab Cos 60 =0 Sum of Fy = Tab sin 60 +500N = 0 Solving for the two above equation we get Tab = -577 N Tac = 289 N When you apply external loads to a structure, external reactions occur at the supports. But internal forces are also developed within each structural member. In a truss, these internal member forces will always be either tension or compression. A member in tension usually stretches, like a rubber band because the tension force tends to make a member longer.This is the opposite for compression. When a member is in compression it is usually being squashed, like squashing a block of foam between your hands. B 289 N 289 N 577 N TAB = -577 N TAC = 289 N B A A 577 N The negative force means that there is a compression force and a positive force means that there is a tension force. Now let’s take a look at point B. 700 N 500 N 2m E D C B A 800N 400N 577 N B 60Â ° TBC TBD 400 N Sum of FX= TBD + TBC Cos 60 +577 Cos 60 = 0 Sum of FY = -400 N + 577 Sin 60 – TBC Sin 60 = 0Once again, solving the two equations TBC = 115 N and TBD = -346 N If we calculated the rest of the forces acting on the various points of out truss, we will see that there is mixture of both compression and tension forces and that these forces are spread out across the truss. When I am going to test the maximum force of my paper truss bridge, I have calculated that it should hold 5 kilograms with no problems and probably will even get up to 10 kilograms. My bridge weighs about 55 grams so my bridge should have a strength-to-weight ratio of over 90, which is very good and if I can get it to hold 10 kilograms it will be wonderful.Once we hit the maximum load we are going to see my bridge come to a crashing end. My crash will be due to over loading, but there is many more reason why bridges come to crashing ends. Some of the more common ones are overloading, collisions that cause damage to the bridge, poor construction, and wear and tear. There are many other things that could make a bridge fail but they get particular, like a bolt in a joint rusting out causing the whole structure to become unsound. Overall we have learned the physics that it takes to keep truss bridges stands, which is a lot.We also came to understand that there is a lot of tension and compression in a truss bridge and that it is a key component of the bridge even though you can’t really see it happening. Plus how bridges will eventually come to a crashing end and what cause them too and hopefully that what we will see happen to my bridge when I demonstrate it in class.Bibliography Boon, Garrett. Model Bridge design. 2010. 30 11 2010 . Britannica, Encyclopeadia. truss bridge. 2010. 31 12 2010 . Buzzle. com intelligent life on the web. 2009. 31 11 2010 . Donan Engineering. 2010. 29 11 2010 . Serway, vuille. College Physics. belmont, CA: brooks/cole, 2009.

How the Internet Works - 618 Words

In 1989, Tim Berners-Lee invented the World Wide Web, an Internet-based hypermedia initiative for global information sharing while at CERN. Sir Tim Berners-Lee is the reason you’re reading this story in a web browser, complete with hypertext and an internet address that looks like this: http://www.wired.com/wiredenterprise/2012/06/sir-tim-berners-lee/. But you weren’t supposed to see the address. In building the first web browser at Switzerland’s CERN nuclear research lab in the early ’90s, the English-born Berners-Lee designed a system where only the technicians behind the scenes would see addresses. The ordinary web user would only see text and hypertext, jumping from page to page without ever typing on a keyboard. â€Å"On the initial design of the web, you didn’t see the http:// when you were a user. You just read text and you clicked on links,† Berners-Lee tells Wired. â€Å"In the original web browser, you had to bring up a special link inspector to see addresses. That’s why I wasn’t worried about http:// being ugly. No one would really see it.† As the web grew, this particular vision was lost — at least in part. But you’d have to say that the web still exceeded expectations. In 2010, according to the International Telecommunication Union, close to a third of the world’s population was using the web, and after beginning life as a means of merely sharing text, it has evolved into a medium that shares everything from audio to video to entire software applications that inShow MoreRelatedHow The Internet Works Essay2437 Words   |  10 PagesHow The Internet Works What is the Internet? The Internet is a world-wide network of computers. It is an Information Superhighway that carries traffic to and from a collection of servers-- remote computers that handle requests for data and information, much like the waiter in a restaurant that takes orders for food. This collection of servers distributed all over the world and is called the World Wide Web (WWW). 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