Threats to Marriage :: Social Issues, Single Mothers

Today there are many threats to marriage and family; and everyone seems to have an opinion on how to create it; fix it; repair it or dissolve it. We no longer look to marriage with dreamy visions of a spouse and the endless bounty of the life and family before us. â€Å"We† seem to want many of the benefits a marriage brings without making the commitment. In the 1700’s marriage was a commitment between families, which was taken seriously. There were marriage bonds with monies paid and then the court order for the marriage; and in other colonies this time-revered process might have 17 distinctive steps. http://www.austincc.edu/jdikes/Marriage%20Ways%20ALL.pdf Ever since Dan Quayle used the television character â€Å"Murphy Brown† in his June 1992 speech as â€Å"encouraging family disintegration† the government has continued to make, â€Å"marital status and family structure†¦.major themes of political rhetoric and government policy† (Page 518). Quayle also remarked that, â€Å"marriage is probably the best anti-poverty program of all† (American Vision and Values, Page 179). Here was one politician who believed the country needed better role models and a return to the values on which our country was founded. Dafoe Whitehead suggests these topics are perceived as an attack on single mothers; and are met with â€Å"anger and denial† (American Vision and Values, Page 182). Rather than attack a single family structure - single mothers, consider the outcomes produced by non-traditional structures. Kay Hymowitz believes â€Å"we are becoming a nation of separate and unequal families that threatens to last in the foreseeable future† (Page 560). This will have consequences on every aspect of our society. Marriage, before children, was the given status quo for the pro-family period of the 1950’s. At that time, divorce and illegitimacy was  ½ of today’s rate, marriage was universally praised and family was hailed as the most basic institution. The 1960’s brought disruptive social and cultural forces. The divorce rate soared and illegitimacy increased 22%. In the 1970’s we see where women could now afford a family without a spouse. It seems the choice to work equally with men devalued the homemaker role of previous decades (Graglia, Carolyn Domestic Tranquility Page 540). These choices were centered on career goals and achieving motherhood; without truly addressing the needs of family and children. And yet many single mothers hover around the poverty line – not nearly as glamorous as â€Å"Murphy Brown† made it seem.

International Baccalaureate Internal Assessment Essay

The European Commission has imposed provisional anti-dumping duties on imports of ceramic tiles from China. The move comes following an investigation initiated after a complaint lodged by the European Ceramic Tile Manufacturers’ Federation (CET) on behalf of 69 tile producers in the EU, the Commission said. The duties range between 26.2% and 73% depending on the company and last for six months. They could be prolonged for five years and are intended to punish tile manufacturers from China who sell tiles below cost-price in the EU. Alfonso Panzani, the president of the CET, said that the duties were not intended to exclude Chinese products from the EU market but â€Å"to bring Chinese prices to a fair level, making it possible for ceramic tile production to continue in Europe, and creating the conditions for healthy competition to develop†. He added: â€Å"There is no reason why we should be less competitive in Europe than when we export outside of the EU.† The provisional duties apply to glazed and unglazed ceramic flags and paving, hearth or wall tiles and unglazed ceramic mosaic cubes. (c) 2011 European Voice. All rights reserved. According to the provided article, the European Commission (an executive branch of the European Union) has recently resorted to the implementation of a protective tariff of up to 73% on Chinese ceramic products in order to protect the European market from Chinese dumping techniques (Protective tariff – â€Å"a tariff designed to shield domestic producers of a good or service from the competition of foreign producers.†1; Dumping – â€Å"the sale of products below cost in a foreign country,†1 often done to gain a monopoly over that product in a particular country). Facing pressure from the European Ceramic Tile Manufacturers’ Federation (CET), an organization representing numerous European tile firms who suffer from cheap competition with Chinese firms, the Commission imposed these duties to drive up the cost of imports and stimulate profit for domestic producers (Competition – â€Å"the presence in a market of independent buyers and sellers competing with one another.†1; Imports – â€Å"spending be individuals, firms, and governments for goods and services produced in foreign nations.†1; Profit – the amount of money a business earns after paying all expenses.) The conflicting economic values of free trade and protectionism are disputed in this situation as to which forces are allowed to control a nation’s economy – the government and domestic producers or the global market and consumer welfare (Free trade – â€Å"the absence of artificial barriers to trade among individuals and firms in different nations.†1; Consumer welfare – individual consumer satisfaction depending on prices and income.) Since domestic ceramic suppliers are threatened with economic ruin from such cheap products, the Commission turned to protectionism to force a more equal domestic competition and punish dumping companies through a tariff despite the consequences of higher prices (Protectionism – † policies that aim at restricting the flow of imports into a country.†2). The anatomy and economic effects of a tariff can be demonstrated in Figure 13 where the perfectly elastic world supply (Sworld) has increased in price (to P2) due to the tariff (Sworld + tariff) and, thus, have reduced the quantity of Chinese imports from the difference between Q1 and Q2 to that of Q3 and Q4. The benefits of a tariff not only include a reduction in imported ceramic, but also gains in producer surplus and tax revenues earned by the government (Producer surplus – the difference between the minimum price a producer is willing to accept for their good and the price they actually receive). Due to this tariff, the original quantity supplied domestically at Q2 has now increased to Q4 and domestic suppliers can now sell their ceramic at higher prices (P2), allotting for an increase in producer surplus (Area 1). Since the government collects the fees paid by the tariff, they now have more funding of which they would presumably return to the public. While tariffs may be advantageous for domestic producers and the government, they reap these benefits at a primary loss to the consumer from the higher prices needed to buy ceramics, and Chinese suppliers whose product is less demanded in the European Union. The major disadvantage of a tariff comes from the reduction in consumer surplus where it had originally occupied Areas 1,2,3,4, & 5 and was reduced to only Area 5 because consumers must now buy ceramics at a higher price (P2). Although Areas 1 through 4 represent the total consumer surplus reduction, since Areas 1 and 3 are beneficial to a society, so Areas 2 and 4 represent the net loss to society through higher prices. Therefore, in order to protect the European ceramic producers from being completely swept from the market due to the dumping efforts of Chinese ceramic exporters, the Commission is justified in the imposition of an anti-dumping tariff because the societal loss of an entire industry is greater than that of forcing higher domestic prices to the consumer. 1 – Defined by: Economics: Principles, Problems, and Policies, 15th edition textbook by Campbell R. McConnell and Stanley L. Brue, publisher: McGraw-Hill Irwin. 2 – Definition derived from: 2 – Definition from: Ziogas, Constantine. Economics for the IB Diploma: Standard and Higher Level, 2008. 3 – Graph adapted from original at: â€Å"Effects of Tariffs.† Linux User’s Group at WSU. Chart. 04 May 2007. Web. .

The Effects Of Receiving Vaccinations On Children

For the longest time, vaccines have been thought of has as medical breakthroughs of epic proportions. They have, in part, led to a dramatic increase in human life expectancy and have successfully rid the human race of horrible diseases such as smallpox and polio. However, recently there has been controversy regarding alleged side effects of receiving vaccinations, with autism being at the forefront of discussion. A study published by Wakefield in 1998 is what sparked the debate; in the study, Wakefield claimed that the onset of autism was directly correlated with a child’s measles, mumps, and rubella vaccination (MMR). Since the study was published, a rather large group of anti-vaccine activists have remained vocal and encouraged others to cease vaccinated their children. Celebrities and media personalities such as Jenny McCarthy have been very outspoken against vaccinations, causing panic among parents regarding the vaccination of their children. By carefully examining the ev idence brought forth supporting both the pro- and anti-vaccine arguments, one can reasonably conclude that the benefits of vaccinations outweigh the potential negative effects. The opposing viewpoints of the vaccine debate have a variety of different sources offering their perspectives. On the pro-vaccine side, studies have shown overwhelmingly that there is no correlation between vaccines and adverse effects. They reach this conclusion in a plethora of ways. In the Maglione study, a meta-analysis ofShow MoreRelatedPrevention And Prevention Of Immunization1113 Words   |  5 Pagesdiseases that can be deadly especially to young children and infants. The process, as explained by the Center for Disease Control and Prevention (CDC), is referred to as the â€Å"4:3:1:3 series,† which represents the number of dosages of vaccines required to fend off diseases such as mealses, mumps, tetsnus, and many others (â€Å"Immunization†). In recent years there has been a movement ma inly empowered by new mothers to forgo some or all vaccinations for their children. The following paragraphs will include anRead MoreCompulsory Vaccinations And The Public Health Intervention Essay1324 Words   |  6 Pagescontroversy is when it comes to compulsory vaccinations, the public health intervention will always have negative or harmful effects in combination with the benefits of compulsory vaccinations. For those that stand behind the argument that immunizations are unnecessary in our children, have argued that the vaccine industry has misrepresented the safety of vaccines. They also have argued that they have covered up information regarding certain vaccinations to gain from the financial standard. In orderRead MoreVaccinations Should Be Mandatory Vaccinations1495 Words   |  6 PagesThe government should mandate vaccinations, and although it would sacrifice the liberty and choice for public health it would keep the well-being and health of everyone much more safe and away from the risk of disease. Most people agree that vaccinations should be mandated because of how being vaccinated keeps people safer in public environments since being vaccinated helps stop diseases from being spread, as proven by science, but people who do not agree with vaccination mandation most of the timeRead MoreVaccinations Are Necessary For Our Youth1305 Words   |  6 Pagesconcerns over the controversy of whether or not vaccinations are necessary for our youth. There have been many incidences where certain individuals’ immune systems put them at risk of becoming more ill and this keeps them from receiving their scheduled immunizations. The benefits that these shots provide outweigh the risks for most of the country’s youth. In order to maintain the safety of the public and protect the health of children, the scheduled vaccinations should be maintained by all families throughoutRead MoreEssay Vaccinations: Vaccines Should Be Mandatory For All People 1001 Words   |  5 PagesVaccinations are designed to help people go through their everyday life. A country doctor, Edward Jenner, who lived in Berkeley, England, first administered vaccines in 1796 (Health Affairs). Throughout history, vaccinations have become better to where they are safer for the human body. Everyone should get vaccinated against certain disease to stay healthy. Vaccines have been proven to make people immune to serious diseases (Childhood Immunization). By being vaccinated the person is not only helpingRead MoreVaccinations Should Be Mandatory For All Children1311 Words   |  6 Pageschildhood vaccinations have been making an appearance. Health officials are concerned that diseases will spread and lives will be lost. Officials all agree that vaccinations will benefit the population. Some parents feel it is an infringement on the right to keep the children healthy and safe. Vaccinations should be mandatory for all children because it will prevent diseases from sp reading, protect future generations, and save children and parents time and money. Childhood vaccinations have notRead MoreVaccinations and Children1531 Words   |  7 PagesThere is much debate and controversy about child vaccinations being safe or not. Parents wonder should they get their children vaccinated and take the risk of their child having a side effect. While some experts say that vaccinations are safe, others say that vaccinations are deadly. Approximately 100 years ago children received 1 vaccine, smallpox. About 40 years ago children received 5 vaccines, diphtheria, pertussis, tetanus, smallpox and polio. Today a child receives 52 vaccinesRead MoreThe Effects Of Autism On Children With Early Signs Of Autism1517 Words   |  7 Pagesconcerns have been formulated from parents of children who received vaccines and associated noticeable changes in their children with early signs of autism. Autism is a neurodevelopmental disorder that affects the behaviour and cognition of children (Quinn, 2014). Autism impairs communication, interest and repetitive patterns of behaviour in a child’s socialization aspect of life (Quinn, 2014). Evidently, autism has shown a prevalent increase amongst children in question with environmental causes (DojaRead MoreVaccination Is The Act Of Receiving An Injection Of Either Prepared Killed Microorganisms920 Words   |  4 Pages Vaccination, also known as immunization, is the act of receiving an injection of either prepared killed microorganisms, living attenuated organisms, or living fully virulent organisms that is administered to produce or increase immunity levels to a particular disease (CDC). Vaccines against measles, mumps, and rubella (MMR), human papillomavirus (HPV), and influenza are three of the most controversial subjects in medicine. Over the last few years, there have been strong opinions concerning theseRead MoreImportance Of Immunisations And Vaccination833 Words   |  4 PagesImmunisations and vaccinations are cautionary practises that uses the body’s natural defence mechanism, also known as the immune response to become immune to various diseases and infections. A vaccination is just receiving a vaccine, whereas an immunisation is receiving a vaccine but also becoming immune to the disease by being vaccinated. The way this is done is by injecting a patient with a small / diluted or weakened dose of the disease or virus. The dose is small and weak enough to allow the

Poor Health Habits Among The United States Should Spend...

fourths of that spent directed at treating chronic diseases in 2006 (Goetzel, 2009). Poor health habits are a contributing factor to chronic diseases, which could be decreased if health habits are improved. Overall, the United States should spend more money on preventative care that would decrease chronic diseases and illnesses. Therefore, the cost of treating chronic illnesses would decrease. As important as managing national spending and funding is, the most important factor is the overall health of Americans. Providing preventative care that varies between racial and ethnic groups does not create a healthier society, but a society with more chronic illness and higher medical bills for its citizens. The average cost of treating cancer†¦show more content†¦Ã¢â‚¬Å"In comparison, a single hospitalization due to diabetes, pneumonia or anemia is estimated to cost over $7,000, $10,000 and $20,000, respectively, for the same year† (American Academy of Pediatrics, 2011). Ove rall, preventative services are a more cost effective lifestyle choice. Historical Data with Explanation of the Problem In America, demographics show that the world is changing. According to a 2000 Census data, 25 percent of the United States population is composed of minority ethnic groups, which has continually increased over the years (Egede, 2006). As the United States continues to become more diverse there will be an increased need to establish validity and reliability across racial, ethnic, and cultural groups (Egede, 2006). Many racial and ethnic groups are continually impacted by the burden of disease, due to socioeconomic status, health between the population, access to quality health care, and environmental factors (Egede, 2006). The Institute of Medicine (IOM) on Unequal Treatment states that â€Å"a large majority of research shows that racial and ethnic minorities experience a lower quality of health services, and are less likely to receive routine medical procedures† (Egede, 2006). Minorities may be less likely to receive the preven tative care they need due to a poor relationship with their

Characteristics Of The Leadership Styles - 994 Words

Each of the leadership styles described in this week’s reading demonstrated unique qualities that would be beneficial when dealing with specific situations and social groups. Below, I outlined the three significant differences I observed in the text, and gave examples of how the differences connected to my own professional life. Difference #1: Intellectual leadership is a style prompted by the demand for change, which is rooted in creative problem solving. Burns states that â€Å"the life of an intellectual leader is inherently conflict ridden† (p.143). This type of leader must be willing to confront what is favorable and instead pursue what is truly the best option, by dealing â€Å"with both analytical and normative ideas† (Bruns, 1975, p.142) The text also suggests that an unique component of this style is that â€Å"the philosophies had few illusions about man as he was;they had high hopes about man as he could be. (Burns, 1975, p. 143). Application of this principal is demonstrated when administrators actively participate in the development and implementation of initiative that will improve student learning/retention. Depending on what side of the camp you are on, standards based instruction can be seen as the â€Å"high hope† of what education could be. It is important to note that it is challenging for a single individual to act as intellectual leader, because the development of ideas requires a structure for discourse (Burns, 1975, p.153). My department has demonstrated thisShow MoreRelatedLeadership Styles And Characteristics Of Leadership1145 Words   |  5 PagesLeadership Styles and Characteristics Leadership goes beyond management, for some, leadership is instinctual and pours over into your personal life. This paper will discuss a leader I admire in my personal life, and analyze their leadership style. I will discuss how that leader has influenced my leadership style, as well as how things like environment and the economy affect my leadership approach. Leader and Company For as long as I can remember my mother has been a remarkable leader. When I wasRead MoreLeadership Styles And Characteristics Of Leadership1301 Words   |  6 PagesComposition 28 October 2016 Leadership Styles Since the beginning of time, people have led and others have followed. Some ruled by terror and with an iron fist, others peacefully and with a gentle touch. In the average person’s everyday life, we encounter leaders of all different shapes and sizes, with various styles of leadership. There are strengths and weaknesses in each style of leadership, in particular, Democratic, Laissez-Faire, and Autocratic. These styles have overlapping qualities thatRead MoreCharacteristics Of Effective Leadership Styles2010 Words   |  9 PagesCharacteristics of Effective Leadership Styles Presented to Perry Barton, Instructor MGMT-1115 Leadership By William Allen June 21, 2015 What are the effective leadership styles? More importantly what are the characteristics of these styles. This paper will discuss in detail three topics and how they relate to effective leadership styles. We will start by evaluating business situations to determine whether the leadership style is participative, autocratic, leadershipRead MoreThe Personal Characteristics, Behavioral Approach, And Leadership Style Of Steve Jobs1972 Words   |  8 Pagesanalyze the personal characteristics, behavioral approach, and leadership style of Steve Jobs. A leadership inclination is quality, which is considered necessary for all senior executives, and not just for the general director. One human resources specialist described the search for the head of the information department: Previously, specialized knowledge would have been in the first place, but now more attention is paid to leadership skills than technical ones. What kind of leadership are required expertsRead MoreCharacteristics Of A G ood Leader1655 Words   |  7 Pagescertain behaviors and characteristics. Specifically from a management standpoint, it is important to understand these behaviors and characteristics so that the manager can demonstrate a certain leadership style that will work best within their own organization. There is a common saying within most organizations, stating that all leaders should be managers, but not all managers should be leaders (Sun). Aspiring leaders need to identify the various types of leadership styles that exist, as well asRead MoreCharacteristics Of Autocratic Leadership946 Words   |  4 PagesCommunity and Family Studies Leadership is the action of leading a group of people or an organization. There are four leadership styles, these include: Autocratic, Laissez-faire, Transformational and Democratic. Autocratic Autocratic leadership also known as authoritarian leadership, refers to the leadership style by which an individual has sole control of all decisions with little consultation from members within the group. An autocratic leader will typically make choices based on their ownRead MoreLeadership Styles And Theories Of Leadership Style1322 Words   |  6 Pagesall of the various styles of leadership that exist. Every organization is structured differently, with differing employee behaviors, and it is the leader’s responsibility to implement the style that will work the best for their specific work or organizational structure. Often, more than one leadership style is implemented to accomplish the desired results of the leader (Blanken). While a multiple of leadership styles exist, three well-known and commonly-practiced leadership styles that will be examinedRead MoreThe Diversity Within The Workplace1324 Words   |  6 Pagestheir look toward leadership has. The increased divers ity in the workplace requires superior synchronization by identified employees to meet effectively the mission and vision of the organization. This individual must be capable of meeting the needs of subordinates with their area of expertise with set expectations for meeting organizational goals. While the world analyzed this need, several theories became known. These theories include: (1) path-goal; (2) situational leadership; and (3) contingencyRead MoreLeadership: Discussion Questions684 Words   |  3 PagesLeadership: 1. Define leadership and explain its importance for organizations. Leadership is one of the most important and commonly discusses issues and topic in relation to organizational success. Actually, the strength and success of an organization is directly proportional to the strength and success of its leaders. Based on a summary of all ideas regarding this topic, Daft Marcic (2012) define leadership as the use of influence among people in order to achieve goals (p.371). Since influenceRead MoreLeadership Style : Douglas Mcgregor s Theory X767 Words   |  4 Pagesthe core characteristics of autocratic leadership in terms of the four key characteristics of the theory and the way autocratic leadership can manifest, it’s auspicious to consider the theoretical basis of the leadership style: Douglas McGregor’s Theory X. Theory X Autocratic leadership style closely rests on the assumptions made in Douglas McGregor’s Theory X. The theory explains why people behave the way they do and if they are acting in a particular way, what kind of leadership style would be

city Teachers Essay Example For Students

city Teachers: Essay Preston Portee 27 February 2002 Rousmaniere, Kate city Teachers: Essay Teaching and School Reform in Historical Perspective New York: Teachers College Press. 1997 This book is very greatly written. The book gives many insights into teachers lives and work during the third decade of the twentieth century. The main focus of this book is about New York teachers, although the author does give information on teachers elsewhere. The book answers many question but it also leaves you with many questions that were not answered. I will try to identify areas in which this book advances our understanding of these issues, and problems or limitations in its discussion of them. Rousmaniere arguments in the book were that the work of teachers changed following the First World. The reason why was because of efficiency-minded administrative practices and the emergence of a social competence program in New Yorks public schools. She use information from the interviews with 21 former teachers and other sources to conclude that the work of teachers intensified as new tasks were assigned to them. She also suggested that their working conditions weaken in other ways. She also argued that teaching began to hold stable profession for women, but it also became more difficult and less fulfilling. The book notes that many of the circumstances which affected teachers at that time had existed earlier too. The administrative concerns with effectiveness and stability had been a problem in New York and other places since the 1920s. Rousmaniere gives evidence that during the opening decades of the twentieth century, teachers were affected by major curricular changes. Teacher that are in the twenties appear to have worked within a bureaucratic, differentiated modern school system quite similar to those that had evolved in a number of cities since the latter nineteenth century. Rousmaniere documented reactions of teachers to urban school life in the twenties. She identified social efficiency with the growing array of new tasks for teachers. She also notes that most teachers probably ignored curricular reform efforts, whether in the twenties or earlier. The book describes the great amount of paperwork city teachers were required to do. The lives of New Yorks teachers in the early twentieth century seem to be similar to those of todays teachers. She also talks about the condition of the city schools. She basically says that the workplace condition effect the teachers. But I dont think that is a good reason because if a teacher really was focus on teaching students then it wouldnt matter. Other parts of the book raise interesting questions, but do not provide fully developed answers. She mentions a survey but do not provide details about the findings. She talks about the policy on married teachers in New York but do not fully explore the effect of such a policy at the time. She does not give ages or ethnic compositions of the teachers. In the end, it is like she wants to suggest that teachers had hard times in New York in the early twentieth century. The historical reality of teachers lives in this era was complex, and different types of education identify the factors that affected their work and their behavior. I recommend undergraduate teaching to read this book. May students will find it easily reached and inspiring. Bibliography none .

Pulse Width Modulation Final Year Project Essay Example

Pulse Width Modulation Final Year Project Paper Chapter 1 Introduction 1. 0 Background Pulse Width Modulation (PWM) is a type of devices that can be used as a DC motor speed controller or light dimmer. PWM is used extensively for speed controller where power-saving application is needed. This device has been used as a motor speed control for small DC fans, for example in computer power supplies. A PWM circuits works by creating a square wave with a variable on-to-off ratio, the average on time may be varied from 0 to 100 duty cycle. The term duty cycle describes the proportion of on time to the regular interval or period of time; a low duty cycle corresponds to low power, because the power is off for most of the time. Duty cycle is expressed in percent, 100% being fully on. From this, a variable amount of power is transferred to the load. The main advantage of PWM is that power loss in the switching devices is very low. When the switch is off there is practically no current, and when it is on, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero. PWM also works well with digital controls, which, because of their on/off nature, can easily set the needed duty cycle. Additional advantage of PWM is that the pulses reach the full supply voltage and will produce more torque in a motor by being able to overcome the internal motor resistance easily. 1. 1 Objectives The objectives of this project are: 1. To develop the actual circuit of the PWM. 2. To simulate the PWM circuit in simulation software. 3. To use the PWM in order to control the speed of the DC motor. 1. 2 Methodology Start Title consideration, ideas Supervisor approval Components specifications and data sheets Proposal Drafting Proposal Evaluation Project Simulation Project Presentation Progress Report Submission END Figure 1. 2. 1 Flowchart of Methodology 1. 3 Gantt Chart 1. 3. 1 Final Year Project 1 | WEEKS| We will write a custom essay sample on Pulse Width Modulation Final Year Project specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Pulse Width Modulation Final Year Project specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Pulse Width Modulation Final Year Project specifically for you FOR ONLY $16.38 $13.9/page Hire Writer ACTIVITY| 1| 2| 3| 4| 5| 6| 7| 8| 9| 10| 11| 12| 13| 14| 1| Student-supervisor-panel allocation, briefing about FYP, introductions| Â  | Â  | | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | 2| Student-supervisor meeting arrange time, finding ideas discuss ideas, project titles| Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | 3| Student-supervisor regular meeting| Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | 4| Proposal preparation| Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | 5| Proposal evaluation, meet supervisor for evaluation, things to be improved| Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | 6| Proposal correction correct any mistakes| Â  | Â  | | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | 7| Project Development choose circuit, check availability simulation| Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | 8| Proposal and progress presentation| Â  | Â  | | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | 9| Progress report writing is based on progress| Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | 10| Progress report submission submit report| Â  | Â  | | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | 1. 3. 2 Final Year Project 2 Week| 1| 2| 3| 4| 5| 6| 7| 8| 9| 10| 11| 12| 13| 14| Tasks| | | | | | | | | | | | | | | Buy Components | Â  | Â  | Â  | Â  | | | | | | | | | | | Construct circuiton breadboard | | | Â  | Â  | Â  | | | | | | | | | | Troubleshoot| | | Â  | Â  | Â  | | Â  | Â  | | | | | | | PCB Layout Design| | | | | | Â  | | | Â  | | | | | | PCB Layout Print| | | | | | | | | | Â  | Â  | | | | Soldering| | | | | | Â  | Â  | Â  | | | | | | | Final Report| | | | | | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Â  | Final Presentation| | | | | | | | | | | | | | | 1. 3. 2. 1 Aims for Final Year Project 2 1. Prepare the actual circuit diagram 2. Building and programming the PCB circuit diagram 3. Drilling the PCB and soldering the components 4. Testing the PWM circuit 5. Troubleshoot 1. 3. 2. 2 Project planning for Final Year Project 2 For the final year project 2, we have to prepare the actual circuit based on our simulation result. We will create the PCB artwork with PCB programming such as ExpressPCB, which is available for free and is surprisingly functional. Next, we have to print out the PCB artwork on a transparency. Then we cut out the printed portion of the artwork. This will define the size and shape of the PCB. To make PCBs, we can use the UV exposure method, which is only slightly more difficult than and significantly more precise than the toner transfer method. To start out, we must cut the PCB to be the same size as the outline of the PCB positive. First, we drew a rectangle the same dimensions of the PCB on the protective layer of UV Reactive copper covered ibreglass board, and then cut it out using a Dremel tool equipped with a diamond wheel. We have to make sure that once we have removed the board from its protective package it will not be exposed to any UV. Fluorescent and halogen lights both output enough UV light that they will expose the board through the protective layer of plastic. Next, after we cut the UV sensitive PCB to size, we are ready to expose the board. Then we remove the protective layer to size, from the PCB right before we place the positive on it, or else dust particles will attach to the board, which will mark the final PCB. To expose the PCB, first remove the protective layer, place the positive transparency on top of the board, and place it in the UV exposure box. An exposure time of 10-11 minutes is recommended. Now we need to drill holes in the PCB for the through-hole components. Finally, we have to solder all the components through-hole components. If the final result is not achieved when testing the final circuit, we have to run troubleshooting and find out the problem. Then, we solved the problem based on the troubleshooting after we identify the real problem. Chapter 2 Circuit Design and Operation 2. 1 Schematic diagram Figure 2. 1. 1 Schematic Diagram of Pulse Width Modulation (PWM) To Control DC Motor Speed. 2. 2 Circuit operation 2. 2. 1 Flow Chart and Description Input Signal DC wave) ? IC NE556 Output Signal (Square wave) LM311 Comparator Potentiometer ? IC NE556 Output Signal (Modulated Square wave) IRF 521 DC Motor Figure 2. 2. 1. 1 Circuit Operation Flowchart The input signal is fed into first half of IC NE556. The IC NE556 will generate square wave. The wave will then go to the second half of IC NE556 and been modulated. Potentiometer will control the second half IC to produce the desired output. A modulated square will be generated from the second IC. This wave of current will be amplified by IRF521 and then went to the motor and spin it. The DC motor speed will depends on the magnitude of the current. Chapter 3 Project Progress 3. 0 The Project Progress and the Project Outcomes The first stage of the progress is building the circuit for the Pulse Width Modulation (PWM) circuit. Then, the best circuit diagram is chosen for our project. A preliminary literature review about our circuit had also been done. In this project, two of the LM556, Dual 556 Timer TTL IC were used to simulate the PWM circuit. The first IC allowed the possibility to generate square wave while the second IC allow modulation variation. Other than that, several problems were encountered when simulating some part of the circuit. This is due to incomplete library component of the simulation software such as the lack of LM556 IC in the first place. This was because the wrong type of licence of the software was selected. After a few trials and some changes of the circuit diagram for simulation, and with the right licence for the software, the PWM circuit was successfully simulated. Figure 1. 1 Expected DC square wave (output) Results Input Signal of 1st half of IC NE556 Output Signal of 2nd half of IC NE556 Calculation from theory: Thigh= 0. 7(RA+RC)C Thigh= 0. 7(1M+1K) (0. 05Â µ) = 0. 035s/35ms Tlow= 0. 7 RB C Tlow= 0. 7 (1K) (0. 05Â µ) = 3. 510-5s/ 0. 035 ms Values from simulation: Thigh= 38ms Tlow= 42 Â µs/ 0. 042 m Input Signal of 2nd half of IC NE556 Output Signal of 2nd half IC NE556 (A=0%, B=0%) (A=0%, B=10%) (A=0%, B=50%) (A=0% B=100%) Calculation from theory: Thigh= 1. 1 RA C Rated Current From Simulation (A=0%, B=0%)I=45. 842mA(A=0%, B=10%)I=132. 953mA (A=0%, B=50%)I=406. 541mA(A=0% B=100%)I=4. 121A Table of Motor Speed Slow| Speed| Fast| 0%| Value of Potentiometer B| 100%| 0. 2077ms| T high (ON time)| 7. l79ms| 132. 95mA| Rated Current| 4. 121A| 12V| Rated Voltage (Constant)| 12V| Since voltage is constant, the higher the current supplied, the faster the motor would spin. Chapter 4 4. 0 The Problems Encountered CASE 1 – FINDING SUITABLE SIMULATION SOFTWARE The PWM circuit uses two of LM556 IC. The first LM556 will convert DC input signal into square wave. Before doi ng the hardware of the project, the software need to be simulated first to check whether the circuit diagram is correct or need some adjustment. Because of this, finding the suitable simulation software had become a problem encounter to finish the project. List below show example name of other simulation software that can be used to run any the software simulation for the project; 1. TINA 2. OrCAD Capture 3. PROTEUS All of the other simulation software above can be use to run the simulation for this project but some of them were not suitable. As an example the TINA software were not used because of the unfamiliarity and the complexity of the software. The project also cannot be simulated using the OrCAD Capture since there were a large number of library which does not have simulation installed. This make it unsuitable since this project required to be simulated. Meanwhile PROTEUS software was not used because of the difficult interface that complicate the user or in other words not user-friendly. CASE 2 – WRONG LICENCE OF SIMULATION SOFTWARE After MULTISIM had been installed, a situation was encountered where the library components are not complete or some of the components are not available. If this problem prolonged, the circuit cannot be designed in the software. Some measures had been taken to find the solution but the problems still persist. There are some types of licence that accompanied for MULTISIM, which are: 1Power PRO Edition 2Full Edition 3Student Edition 4Education PKG Edition 5Base Edition At first, the Full Edition licence was installed. When the circuit was being designed, a lot of components were unavailable. Every aspect of the software was checked, but no problem related to the software was detected. The MULTISIM software was cleanly installed in the computer. . 1 Solutions for Every Problem CASE 1 SOLUTION – USE MULTISIM SOFTWARE The simulation can be done by using simulation programmed like TINA, Proteus, or OrCAD Capture. Unfortunately, all of these simulation programmed mentioned above have problems as explained before. Without a proper simulation, it is hard to detect any problems that exist in the design of the circuit. Finally, MULTISIM i s chosen as the simulation program. MULTISIM was suitable for simulation of the Pulse Width Modulation circuit. MULTISIM has all the required components in its component library. Hence, all the components can be place in the circuit to complete it. Simulation can be done easily by using MULTISIM. All the results being cleared by using this programmed. Expected results are the PWM wave which will control the motor. CASE 2 SOLUTION – WRONG LICENCE OF SIMULATION SOFTWARE This problem was easily encountered by reinstalling licence of the right type. In this case, PowerPro Edition licence type was required. After it has been reinstalled, all the components are unlocked. Hence, the process of designing the circuit in the simulation software continued, and simulation process succeed. Chapter 5 Conclusion For this semester, the project progress was successful until the simulation. Hence, the simulation needs to be done correctly according to the circuit so that expected result can be obtained. The circuit diagram for PWM to Control DC Motor Speed has been successfully designed. Thus, the first objective has been achieved. The progress of the project works efficiently if the project followed accordingly to the Gantt chart made at the beginning of the project. The Gantt chart contains all the important steps that need to be followed in rder to finish the project successfully. All the steps in the Gantt chart been mentioned with respective date. Hence, there should be no problem during Final Year Project 1 when all works were being done according directly to the Gantt chart. The simulation for PWM to Control DC Motor Speed had been done by using simulation program, MULTISIM. MULTISIM provides all the necessary components to complete the simulation for the PWM circuit . Since the output should be a DC motor or a DC fan, it was replaced with Oscilloscope or Multimeter to observe the changes that occur in the simulation. This shows that choosing MULTISIM is the smart choice to run the simulation because of the advantages and the ease of use that this simulation program has. REFERENCES 1. Motor Speed Controller, retrieved from http://homepages. which. net/~paul. hills/SpeedControl/SpeedControllersBody. html 2. 4QD-TEC: Electronics Circuits Reference Archive : PWM speed control, retrieved from http://www. 4qdtec. com/pwm-01. html 3. PWM Motor Speed Controller / DC Light Dimmer, retrieved from http://www. solorb. com/elect/solarcirc/pwm1/ 4. PWM DC Motor Controller, retrieved from http://picprojects. org. uk/projects/ppc/index. htm