Planning and management of public relation campaigns Essay - 1

Planning and management of public relation campaigns - Essay Example Third, the Chartered Institute of Public Relations (CIPR) defined â€Å"public relations [as] about reputation† and â€Å"the planned and sustained effort to establish and maintain goodwill and mutual understanding between an organization and its publics† (Langley, 2009). The roles of public relations practitioners are diverse, depending on the size, nature, and aims of their organizations. Their roles can include, but not limited to, the following: (1) cause or relationship marketing- creating and preserving relationships to build customer loyalty; (2) communication- sharing ideas, messages, or opinions through verbal/nonverbal/oral expressions; (3) community relations- build relationships between/among organizations that impact one another; (4) crisis management- responding to different kinds of crises and maximizing potentially positive outcomes; (5) integrated marketing communication (IMC)- merging PR, marketing, and advertising to attain a uniform marketing approach; (6) issues management- identifying organizational issues and responding to them; and (7) media relations- creating relationships between media and the organization (Johnston & Zawawi, 2014). The goal of this paper is to describe how a PR campaign is planned and managed in general ac ross different organizations and sectors. The purpose of planning PR campaigns is to attain order and some control and predictability over them (Gregory, 2010). Planning provides a sense of direction, clarification of important aims and goals, and ability to manage objectives, as well as processes and outcomes (Austin & Pinkleton, 2015). In addition, public relations must function to support and align itself with organizational vision, mission, and goals (Gregory, 2010). Strategic planning improves the ability of PR to determine PR’s contribution to the company, the processes and steps involved to attain aims and objectives, and metrics and standards for evaluation (Gregory, 2010). Planning refers to analyzing

Singal processing and linear systems + Matlab Essay

Singal processing and linear systems + Matlab - Essay Example The square wave response of a dynamic system measures how the dynamic system responds when a square wave is applied to its input. Generally a unit step function is applied defined by the following equation: Laplace transform and Fourier transform both are use for analysis of aperiodic signals. Laplace yields the result in s-domain where as Fourier transform yields it in frequency domain. Laplace is more often used because in s-domian it is easier to analyze the performance of the system by looking at the poles and the zeros. The Laplace transform is usually used in the context of one-sided signals, i.e. signals that are zero for all values of  t  less than some value. Usually, this "start time" is set to zero, for convenience and without loss of generality, with the transform integral being taken from zero to infinity. The Fourier transform is used for analyzing systems that process signals that are infinite in extent, such as modulated sinusoids. (LTI) The signal is compared both in frequency and time domain, before and after filtering. As seen in the graphs the amplitude of the signal after filtering is 1. The amplitude thus decreases from 2 to 1, showing 3dB attenuation. In frequency domain the higher frequency coefficients are zero. They cover almost half the total bandwidth. Thus the half band filter has made half of the coefficients zero with 3dB

Conflicts In The Nile Basin History Essay

Conflicts In The Nile Basin History Essay The Nile is the longest river in the world, it is 6860 km long, it is supplied by two great river systems, the 1st one is the White Nile (in the Lake Plateau) which is surrounded by Kenya, Uganda, Congo, Rwanda, Tanzania, an Burundi; and the other one is the Blue Nile (in Eritrea and the Ethiopian highlands); while in the north there are Egypt and Sudan that receive their water from the previously mentioned sources. The Nile River had a great role in making history on its banks, a lot of civilizations and nations were made on them; The Nile Basin consists of 10 nations which are: Egypt, Sudan, Eritrea, Kenya, Tanzania, Rwanda, Uganda, Democratic Republic of Congo and Burundi with a total population of three hundred millions and it is expected to be doubled in the next twenty five years, the basin itself is 3,000,000 Km square that covers about 10% of the African continent area; There is no doubt that with the increasing of population, the water requirement is also increased in addition to the water that is needed for agriculture and energy production. It is may also be important to know that all the basin nations are really poor maybe the poorest in the world (except for Kenya and Egypt) and that poverty increases rates of disease and starvation. According to the terms of the agreement that was made in 1929 between Britain (the colonial power of Sudan, Tanzania, Uganda, and Kenya, Egypt and Sudan have the absolute right to use 100% of the Niles water, while in 1959 there was another one between Sudan and Egypt. Since 1992 a lot of efforts were exerted to push the basin nations towards development and cooperation, and finally in 1999 there was the establishment of the NBI (Nile Basin Initiative), it was developed by the World Bank, Canadian International Development Agency and the United Nations Development Programme, it was established to decrease the tension between those nations and to help them to develop and gain regional stability by controlling and planning the water resources all together. Any management of any river basin in the world is complex, while the Nile Basin may be considered to be the most complex one because of its history of poverty, sacrifices, wars and insecurity, and on the other hand, the rapid and non-stoppable population growth on its banks that surely increases water and energy requirements, and that is why the NBI must have a great role in managing all those challenges and ensure the cooperation between all the nations. Recently the conflicts became even more aggressive between the Nile basin nations when 4 Nile nations which are Tanzania, Ethiopia, Rwanda, and Uganda have together signed an agreement that allows them to use more amounts of Nile waters in development projects and irrigation, meanwhile Egypt and Sudan didnt agree and they convinced Burundi, Eritrea, Democratic Republic of Congo and Kenya of not signing on that agreement. Discussion: The Challenge: The Nile Basin consists of 10 nations which are: Egypt, Sudan, Eritrea, Kenya, Tanzania, Rwanda, Uganda, Democratic Republic of Congo and Burundi with a total population of three hundred millions and it is expected to be doubled in the next twenty five years, the basin itself is 3,000,000 Km square that covers about 10% of the African continent area; There is no doubt that with the increasing of population, the water requirement is also increased in addition to the water that is needed for agriculture and energy production. The River Nile is 6672 km long and it is the second longest river in the whole world, and it is supplied by 2 main sources, the first one comes from Lake Victoria and forms the White Nile that passes through Uganda and ends in Sudan while the second source is in the Ethiopian highlands and forms the Blue Nile that meets the White Nile at Khartoum then it continues northward to pass through Egypt and ends into the Mediterranean Sea. The River Nile for Egypt is everything; People in Egypt has always been connected to the Nile from the day of their birth till the moment of their death; Historically, in the fifth century B.C. Herodotus described Egypt as the gift of the Nile, and after Nasser built the dam at Aswan, the connection was reinforced more and more, Egypt depends mainly on the River Nile as a water supply and with the rapid increase in population, the water demands become more. In 1929 an agreement was held between Britain and Egypt and another one in1959 that was held between Egypt and Sudan, both have given the downstream nations their natural right of the Niles waters, construction of dams was approved and the water was divided as follows: Egypt has forty eight billions cubic meters, Sudan has four billions, and thirty two million will end into the Mediterranean Sea; now that was acceptable then because the rest of the upstream countries were not developed, and their population was relatively low, today those countries need to develop and they need to develop new projects and construct dams and that would be a high threat to the downstream nations as the downstream nations want to renegotiate about the old treaty, on the other hand, Egypt has refused to renegotiate and considers its share of water a natural right and became prepared for any military action as Egypt is known as the most powerful military power in Africa. Egypt receives 97.5% of the Niles water and Sudan receives 77%, however, it is very important to make clear that the water distribution between the Nile Nations is fair because of the following: The 7 upstream nations are located in humid areas they have rainfall average range from 1250 to 1500mm annually, on the other hand it is 500mm in Sudan and Eritrea while it is not more than 15mm in Egypt annually. Egypts climate is hyper arid with high temperature that will cause rapid evaporation and will definitely cause marked losses of water resources in Egypt. The upstream nations receive about 1500 billion cubic meters every year while on the other hand Egypt receives only 85 cubic billion meters every year and that equals 5-7% of the total water resources. The Nile Basin Initiative (NBI) In 1999 the Nile Basin Initiative was established and developed by the World Bank, CIDA, and the UNDP, it was established in order to decrease the conflicts and the tensions between the Nile basin nations and help them to cooperate and develop the water resources of the Nile. It was supported by a lot of donors including Denmark, Canada, Germany, Japan, Finland, Italy, Norway, the UK, the Netherlands, the US, Swede, the African Development Bank, GEF, FAO, the World Bank and UNDP. The NBI has stated that they can make successful 100% development that will definitely lead to more food and energy production, development of industry, development of transportation, and other regional activities development. The projects of the NBI include fishing projects, management of water, management of the floods, reduction of the pollution, and finally controlling the waterborne diseases. Management of water resources is considered to be a very complex process in any river basin, and if you realized that the Nile basin has always been characterized by poverty, water scarcity, huge population, and long history of wars and insecurity then you will understand how complex and difficult it can be. NBI knew that cooperative development is the only way for the greatest results and maximum benefits to all of the Niles basin nations, the NBI provides the shared vision and a base for cooperative development, and its primary objectives are: Developing the water resources of the Nile Basin in an equitable way in order to ensure: Security Prosperity Peace Ensure the optimal use of the Nile Basin water resources Ensure joint action and cooperation between all the Nile Basin nations Eliminate poverty and enhance economic renaissance Transforming the plan into action and the dream to a fact Conflict in the Nile Basin In Entebbe, Uganda, 14-2-2010, 4 upriver nations which are Ethiopia, Tanzania, Rwanda, and Uganda have started and signed an agreement that allows them to have more management of the Nile waters to use them in development projects and irrigation. That agreement was made while the negotiations with the downstream nations were standstill; on the other hand the reaction of the downstream nations was not sending any delegations but they have used diplomacy in convincing Burundi, Kenya, Eritrea, and Congo not to sign on that agreement. The 7 upstream nations now consider the old treaties unfair and demand more water to be used for irrigation and development projects. Egypt cleared that cooperation between the Nile Basin nations is the only way to achieve maximum benefits and that the upstream nations can make better use of the water resources they already have (rainfall), however, the upstream nations are threatening that they would sign another agreement that will exclude Sudan and Egypt and distribute the Nile waters in a new way; that agreement is considered to be a death sentence to all the Egyptians, and that was what made Egypt announce that it will take whichever action may be found necessary to secure its share in the River Nile. Another important fact to be mentioned is that Israel is participating in building dams in Uganda on the Nile waters and that increases the worries and the tension of the Egyptians. It is matter of time for Sudan and Egypt to specify their reaction against that new agreement, and they have to make a serious act to protect their rights of the Niles water; every country has to pay everything to protect its national security. Solutions and recommendations: Basin nations are depending on each other, they are all linked to the River Nile, if Nile nations have cooperated and managed Nile waters all together, synergy will be created between them and conflicts between them will be resolved, and regional stability and development will be achieved; That could only happen if all the Nile nations have reached a legal agreement between all of them based on trust, shared interest, and common bond. Collaborative management will help in reaching peace between all the Nile nations, because if we managed to share water, the struggle for life will disappear, and battles between tribes, clans, families, neighbors and nations will also disappear. The Basin Nations must know that natural resources (water) can bring peace and cooperation instead of fighting each other, they can use that water to build new culture and new developments. Another useful solution is to take into consideration the opinions of the public including farmers, women, different organizations, and fishers. Finally there must be management schemes that determine the rightful share of water for each country according to its needs and in order to help all the Nile nations to use the Niles water today and in the future with easy accessibility and based on the shared interests and the broad participation. Conclusion:

Outcry Against Conformity in Whos afraid of Virginia Woolf? Essay

Outcry Against Conformity in Who's afraid of Virginia Woolf?    Who's afraid of Virginia Woolf? may be viewed as a criticism of American society in the 1960s. Edward Albee saw 'the responsibility of the writer...to be a sort of demonic social critic': thus the play became a reaction against the illusionary plays of its time. Two lines from the play are directly lifted from the works which Albee is mocking: 'Flores para los muertos' is from A Streetcar named Desire and Martha's speech - 'Awww, tis the refuge we take...' - is from a play by Eugene O'Neill. Both of these playwrights sanction illusion in the face of reality; Virginia Woolf is said to be an elaborate metaphor for the 'willing substitution of fantasy for reality, the destructive and dangerous infantilising of the imagination and the moral being by fear.' Albee saw society as too willing to conform and adjust itself morally in order to benefit and succeed. George's attempts to escape from such a society result in his hiding in history and thus him and Nick are no better than each other. George has to resist the totalitarian - 'defend Berlin' - in Nick but his attempts to defend Western civilisation 'against its sex- and success-orientated assailants...are too closely centred on his scrotum.'   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   The setting - New Carthage - of the alcohol-sodden gathering is significant in itself. The original Carthage was founded in the ninth century BC and it was razed to the ground in 146AD, when it collapsed under the weight of its own power. It is thus being likened to the America of the 1960s where, again, money and power provided the principal axels for behaviour and superseded the values of culture. As Ni... ...tack on society. By referring to well known contemporary texts, Albee mocks the attitudes that their works sanction. The characters are created as before and after pictures of the results of relationships based in delusion, with clear links to moments in history acting as sounding boards for each others thoughts. Their intoxicated states allow, for the first time in a long while, for their true feelings and motives to be revealed, and for all the secrets and lies that have formed the keystones to their marriages to be removed finally allowing a true test of their strength. Unsurprisingly, what is left very quickly collapses: a warning to others and a wake-up-call to society. Who's Afraid of Virginia Woolf? is an outcry against the thoughtlessness and conforming nature of Western culture and an attack on those who not only live, but sanction, such a lifestyle.   

Should Parents Physically Discipline Their Children

Jamie Dukes Dr. Early English 104 April 13, 2009 Should Parents Physically Discipline Their Children? Should parents physically discipline their child for doing something wrong? I say yes! I think physically discipline one’s child will correct behavior problems, improve grades, and help them to become well mannered; but I am going to let the Bible’s point of view answer this question. The history of the Bible says, â€Å"Foolishness is bound in the heart of a child, but the rod of correction shall drive if far from him† (Proverbs 22:15). The Hebrew word for â€Å"foolishness† does not speak of â€Å"playful mischief. † It speaks of â€Å"an inability to discern what is good. † Children (with their limited knowledge and experience) are not able to discern what is best for them. For example, a two year old may want ice cream for breakfast, because he has no understanding of balanced nutrition. Small children need to be told what to do, and not asked if they want to do it. And then, as they increase in years an experience, gradually, they should be allowed to make more and more decisions on their own. (DeVitio 69. 4) According to my research I found at least six Bible verses that included discipline, but to name a few. He that spareth his rod hateth his son: but he that loveth him chasteneth him betimes (Proverbs 13:24) Withhold no correction from the child: for if thou beatest him with the rod, he shall die. (Proverbs 22:13) Thou shalt beat him with the rod, and shalt deliver his soul from hell. (Proverbs 23:14) and the last Bible verse I could find had the same qualities of disciplining a child; the rod and reproof give wisdom: but a child to himself bringeth his mother to shame. Proverbs 29:15) It can be argued that most conservative Protestants believe that the Bible is completely accurate and inerrant-free. The passages in Proverbs probably accurately and precisely portray Solomon’s parenting style (Was a man in the Bible). As an adult, Solomon’s son Rehoboam, was viscious, unfeeling, insiderate to his subjects, had no regard for human rights, and was widely hated. He barely es caped assassination at the hands of his own people (â€Å"Child† 13). Perhaps the Bible’s true message here is: These points of view are from the Bible, but I wanted to know the point of view from others as in every day people who walk around with their kids to supermarkets or stores, so I decided to conduct some research to see if people obey or abide by the rules of the Bible. For my field observation, I visited three places; Bi-Lo, a High school basketball game, and in Sumter, SC. February 6, 2009 Time: 6:30 P. M – 9:00 P. M. I went to basketball game and found myself talking to other people. The lady told me, â€Å"that she beats her children because they are acting the fool and she knows that if she beats them, they will act better. † The lady also knows that beating them at their age now will prevent them from being disobedient and troublemakers. I asked a very old man who has adult children now, and I asked him about would he be beat his granddaughter. He told me â€Å"yea†¦because if she actin’ she going to get punished for it. † Friday, February 7, 2009 Time: 10:00 A. M – 11:00 A. M. At Bi-Lo I was walking around to see who was in the store. Then I browsed some of the food. I saw the little boy and without his mother; I was wondering was the little boy with someone, but I didn’t know who to ask. So a few a minutes later his mother came up to her son with an expression on her face as if it were say,†utter disappointment. The boy’s mother told him when she gets home she was going to get him!. So right before the lady left with her son, I asked, does she physically beat her son? She was like yea! I’m gonna beat his tail† I asked her why? And she said, he was actin act up. † February 9, 2009 (Time: 2:00 P. M – 4:00). When I came back to school on the weekend after spring break, I visited the Sumter Mall. And since I was here I thought I could use this mall as part of my experience. First I visited the ToysRus in Sumter. This was kind of interesting environment where lots of children were running around begging their parents, they want one or the other toy, and the parents are constantly telling the child no. this causes some of the children to want to rebel l from their parents and act up. I found this kid playing a demo video game in the console games department, and he was enjoying himself until his mother called him. He didn’t seem to want to move, so he figured he could play just a little bit longer. His mother called him again. The boy still didn’t move so the mother walked real fast to the boy and grabbed his ear. She got his attention this time. I didn’t get a chance to ask the lady does she physically discipline her child but as soon as I entered the parking lot, I was shocked because this lady was whipping her son like there was no tomorrow! Based on the observations, I believe that discipline one’s child will correct behavior even if it’s just for a little while. The main goal as a parent or guardian is to want their child to behave accordingly, and if you know that physically beating for that reason is fine. But one must not over step their boundaries, physically discipline can also lead to child abuse (Neifert 14. 6). These things can get tide up in the law and you may be just battling for your child. When you discipline your child you should let your child know, then till them if they do it they do it again, the same discipline will be taken. Telling one’s child they will do it means that they will do it means that as parents they need to keep their word just as the Bible said! I interviewed two persons. The first person was Sentoria Felder. I think she is a good candidate for this interview because I think she’s a Christian at heart with a firm belief in the Bible. So I asked her a series of four questions to answer. Question #1: Do you think children should be physically disciplined? Why or why not? She answered yes, because it shows how much you care about the child. It’s sort of like a wakeup call. Question #2: How effective do you think disciplining a child can be? She answered, It can be very effective and it should be because it can prevent the child from being on a dangerous path. Question #3: What age do you think it should start? Why or why not? She answered, When they are old enough to start walking and getting into things. Question #4: What age should it stop? Why or why not? She answered, As long as the children are still in the parents care or house. The second and last person I interviewed on campus is Richard Jones. I chose Richard because I felt as if he doesn’t have that many standards or as in a way to discipline a child so he agreed that I would interview him. I told him to say what was on his mind. I asked Richard the same series of questions I asked Sentoria. Question #1: Do you think children should be physically disciplined? Why or why not? He answered, Yes, because when you show a child discipline, they know that you mean business and therefore they will give you respect. Question #2: How effective do you think disciplining a child can be? He answer, It can be very effective because if you discipline them for doing something bad, they’ll know not to repeat the same thing next time. Question #3: What age do you think it should start? Why or why not? He answered, When a baby is able to move on their ass. (Meaning when they crawl, they play with things that are harmful). Question #4: What age should it stop? Why or why not? He answered, When they out more, because then they’ll have to deal with the real world consequences. For the interview, I think that was successful. I also had conducted surveys to 33 people, who were on campus. This is my analysis of the surveys. For Question #1, out of a possible 33 people; 29 said that children should be physically disciplined. The remaining persons said that children should not be physically disciplined for that there are other disciplinary methods. Based on this information I can conclude that many children receive discipline, but it doesn’t have to physical. For Question #2, out of a possible 33 people; (a whopping 100 percent) said that disciplining a child can be very effective. I can conclude that disciplining can be a tool to help children, but it must be enforced by the parent or guardian. For Question #3, out of a possible 33 people; 16 people said that there is no real starting age for a child to be disciplined. The remaining persons said that discipline comes at about 3 years of age. I can conclude that disciplinary action comes when the child has done something wrong for the parent to discipline them. For Question #4, out of a possible 33 people; 20 people said that being physically disciplined should stop at the age of about 18 years of age. The remaining persons said that the age a parent should stop disciplining a child is when children are mature and grown. Therefore they are independent with their own responsibilities. I can conclude that children should stop being physically disciplined when they know right from wrong and they do not engage in wrongful activities or anything that would cause them to be physically disciplined. In conclusion, it is with this information that has been given that I feel that physical discipline should be used. Physical discipline instills a sense of what’s right and wrong and it prevents in most cases, children from continuing to commit wrongful acts. There was a time in my life where I physically disciplined and now that I am older, I understand the concept of physical discipline and the effect it had on me and the effect it has on children that is implemented on. The Bible is the longest existing book in history that also has truth to it and I know that the Bible has the answer to every problem that anyone has. I think physically discipline one’s child will correct behavior problems, improve grades, and help them to become well mannered, productive citizens. This is why I think children should physically disciplined. Works Cited â€Å"Child Corporal Punishments: Spanking:†What is The Rod? † â€Å"Mentioned in Proverbs† Google 2009. Feb. 2007http://www. religioustolerance. org/spanking13. htm Di Vito, Robert A. Biblical Theology: Issues, Methods, and Themes. (Book Review). Theological Studies 69. 4 (Dec 2008): 922(2). General One File. Gale. Morris College. 1 Mar. 2009 Felder, Sentoria. Personal Interview. 6 Mar. 2009. Jones, Richard. Personal Interview. 12 Mar. 2009 Neifert, Marianne. â€Å"No More Disciplines Traps. †Parenting 14. 6 (August 2000): 88(4). General OneFile. Gale. Morris College. 6 Mar. 2009. Proverbs: 19-23: 33-36. Holy Bible. KJV.

Skema Answer Manufacturing Proces 1

FACULTI OF MECHANICAL ENGINEERING UNIVERSITI MALAYSIA PAHANG BMM3643 (SEM II_2012-13) Assignment #1 1. a) What metals are frequently cast into products? b) What materials are used to produce the expendable patterns for investment casting? c) Explain why a casting may have to be subjected to various heat treatments. (8 marks) Answer a) Cast parts can range in size from a fraction of an inch and a fraction of an ounce to over 30 feet and many tons.Moreover, casting can incorporate complex shapes, hollow sections or internal cavities, and irregular curved surfaces. b) In investment casting a pattern is formed from a low melting temperature, low vaporization temperature material, often wax. The mold is produced by surrounding the pattern with the mold material. The mold cavity is produced when the pattern is removed by melting/vaporizing the pattern. In early process development with porous mold materials the melted wax from the pattern would migrate into the mold material and be lost. ) Heat treatments (described in Chapter 4) such as quenching and tempering, among others, are carried out to optimize the grain structure of metal castings, thereby controlling and enhancing mechanical properties. Heat treating can control microporosity, which is a main reason that castings are weak in tension. 2. a) What are some of the attractive features of die casting compared to alternative casting methods? b) For the cast metal wheel illustrated in Figure below, show how (a) riser placement, (b) core placement, and (c) chills may be used to help feed molten metal and eliminate porosity in the isolated hub boss. ) What are some of the general defects encountered in casting processes? Name and briefly describe three. (8 marks) Answer a) Die casting is characterized by extremely smooth surface finishes, excellent dimensional accuracy, and high production rates. A single set of dies can produce many thousand castings without significant changes in dimension. b) Solutions; i) Riser ii) Core iii) Chills c) General defects include; v) misruns, in which the casting solidifies before filling the mold cavity v) cold shuts, in which two portions of metal flow together but there is lack of fusion at the joint; vi) cold shots, where solid globules of cast metal become entrapped in the casting; vii) shrinkage cavity, which is a depression on the casting surface or an internal void in the casting caused by solidification shrinkage; viii) microporosity, which is a network of small voids throughout the casting caused by localized solidification shrinkage; and ix) hot tearing, which is a crack in the casting caused by a mold that does not ield to the metal during the early stages of solidification shrinkage. 3. a) How does the fabrication of a thermoplastic polymer differ from the processing of a thermosetting polymer? b) What are the significant differences in the equipment and operating procedures between injection mold- ing of thermoplastics and injection molding of the rmosets? c) Can thermosetting plastics be used in injection molding? Explain. (8 marks) Answer a) Thermoplastic polymers can be heated to a temperature at or near the melting temperature so that the material becomes either a formable solid or a liquid.The polymer can than be cast, injected into a mold, or forced through a die to produce the desired shape. With thermosetting polymers, once the polymerization has occurred, no further deformation can occur. Thus, the polymerization reaction and the shape-forming process must be accomplished simultaneously. b) The differences in injection molding of thermosets are (1) shorter barrel length, (2) lower temperatures in the barrel, these first two reasons to prevent premature curing; and (3) use of a heated mold to cause cross-linking of the TS polymer. c) Thermosetting plastics are suitable for injection molding.The basic modification which must be made to the process is that the molds must be heated to allow polymerization and crosslinkin g to occur in the mold cavity. The major drawback associated with this change is that, because of the longer cycle times, the process will not have as high a production rate as injection molding of thermoplastics. 4. a) Identify one injection molding process could be used to inject a single part with two or more different material as shown below. b) Describe process mechanism c) List and explain THREE (3) advantages of this technology? (8 marks) Answer a) Multi-shot injection molding ) This process ables to to shoot two or more different materials into the same mold, into different locations, resulting in parts with increased functionality, improved cosmetics, and multiple mechanical properties. c) Advantages; i) Reduced cycle time * Compared to multiple molding cycles of separate components, molding multiple materials in the same cycle has obvious time and labor benefits. ii) Reduced part cost * Combine reduced cycle times, reduced labor times, and eliminated assembly operations, a nd the total cost of multi-shot molded parts becomes less, compared to alternative single-shot methods. ii) Improved Adhesion * With multi-shot molding we get a true physical bond, resulting in a much stronger, longer lasting bond, compared to more traditional â€Å"skin on skin† insert molding or post-molding assembly. 5. d) What are sheet-molding compounds (SMCs)? Bulk-molding compounds (BMCs)? e) What are some of the forms in which reinforcement fibers appear in composite materials? f) Describe the problems involved in recycling products made from reinforced plastics. (8 marks) Answer a) Sheet molding compounds are sheets composed of chopped fibers and resin, the sheets being about 0. inch in thickness. These can be press-formed in heated dies to provide an alternative to sheet metal where light weight, corrosion resistance and integral color are desired. Bulk-molding compounds are fiber-reinforced thermoset molding materials containing short fibers in random orientation. They are formed into products using processes like compression molding, transfer molding or injection molding. b) Fiber-reinforced composites use the strength of the fibers to impart additional strength to the fiber-matrix whole.The use of fibers means that added strength will be in the fiber length direction. The commonly used fiber forms are; i) long, continuous fibers are their use results in increased strength in the fiber length direction, ii) fibers woven into fabric layers used in thin sheet composites and they add strength in the two in-plane fiber directions, iii) woven fabrics of fibers formed in three dimensions so that when embedded in the matrix strength in three dimensions is increased, iv) short, chopped fibers that can be oriented in a particular direction or randomly. ) The main problems are that recycling usually requires the use of a single type of material, and that some plastics (mainly hard and brittle polymers) are more difficult to chop into small pieces for further processing than others. With reinforced plastics, this requires that the reinforcement be separated from the matrix, a very difficult task and uneconomical task. Note that matrices are often thermosets, so it is not practical to melt the matrix and separate the fibers from a molten phase. 6. ) In the casting of steel under certain mold conditions, the mold constant in Chvorinov's Rule is known to be 4. 0 min/cm2, based on previous experience. The casting is a flat plate whose length =30cm, width =10cm, and thickness =20 mm. Determine how long it will take for the casting to solidify. h) A round bar of 15-mm diameter is extruded from a single-screw extruder of 100 mm barrel diameter. The material is LDPE. Calculate; i) The approximate flow rate (kg/h), ii) Speed of emerging extrusion Given : Density LDPE = 0. 92 g/cm3) (10 marks) Answer a) Volume V = 30 x 10 x 2 = 600 cm3 Area A = 2(30 x 10 + 30 x 2 + 10 x 2) = 760 cm2 Chvorinov’s Rule: TTS = Cm (V/A)2 = 4(600/760)2 = 2. 493 min b) R i) Flow rate, qe= CeDscr = 0. 006(100)2. 3 = 238. 86 kg/h ii) Density, ? = 0. 92 g/cm3 Cross-sectional area = (152*? )/4 = 1. 767cm2 Volume = 238. 86 / 0. 92 = 259635cm3/h = 72. 12cm3/s Extrusion speed = 72. 12 / 1. 767 = 40. 8 cm/s ******************************************************