Aluminum or Aluminium Element Facts

Aluminum or Aluminium Element Facts Aluminum Basic Facts: Symbol: AlAtomic Number: 13Atomic Weight: 26.981539Element Classification: Basic MetalCAS Number: 7429-90-5 Aluminum Periodic Table Location Group: 13Period: 3Block: p Aluminum Electron Configuration Short Form: [Ne]3s23p1Long Form: 1s22s22p63s23p1Shell Structure: 2 8 3 Aluminum Discovery History: Alum (potassium aluminum sulfate- KAl(SO4)2) has been used since ancient times. It was used in tanning, dyeing, and as an aid to stop minor bleeding and even as an ingredient in baking powder. In 1750, German chemist Andreas Marggraf found a technique to produce a new form of alum without the sulfur. This substance was called alumina, which is known as aluminum oxide (Al2O3) today. Most contemporary chemists of the time believed alumina was an earth of a previously unknown metal. Aluminum metal was finally isolated in 1825 by Danish chemist Hans Christian Ørsted (Oersted). German chemist Friedrich Wà ¶hler attempted unsuccessfully to reproduce Ørsteds technique and found an alternate method that also produced metallic aluminum two years later. Historians differ on who should receive credit for the discovery.Name: Aluminum derives its name from alum. The Latin name for alum is alumen meaning bitter salt.Note on Naming: Sir Humphry Davy proposed the name aluminum for th e element, however, the name aluminium was adopted to conform with the ium ending of most elements. This spelling is in use in most countries. Aluminium was also the spelling in the U.S. until 1925 when the American Chemical Society officially decided to use the name aluminum instead. Aluminum Physical Data State at room temperature (300 K): SolidAppearance: soft, light, silvery white metalDensity: 2.6989 g/ccDensity at Melting Point: 2.375 g/ccSpecific Gravity: 7.874 (20  °C)Melting Point: 933.47 K, 660.32  °C, 1220.58  °FBoiling Point: 2792 K, 2519  °C, 4566  °FCritical Point: 8550 KHeat of Fusion: 10.67 kJ/molHeat of Vaporization: 293.72 kJ/molMolar Heat Capacity: 25.1 J/mol ·KSpecific Heat: 24.200 J/g ·K (at 20  °C) Aluminum Atomic Data Oxidation States (Bold most common): 3, 2, 1Electronegativity: 1.610Electron Affinity: 41.747 kJ/molAtomic Radius: 1.43 Ã…Atomic Volume: 10.0 cc/molIonic Radius: 51 (3e)Covalent Radius: 1.24 Ã…First Ionization Energy: 577.539 kJ/molSecond Ionization Energy: 1816.667 kJ/molThird Ionization Energy: 2744.779 kJ/mol Aluminum Nuclear Data Number of isotopes: Aluminum has 23 known isotopes ranging from 21Al to 43Al. Only two occur naturally. 27Al is the most common, accounting for nearly 100% of all natural aluminum. 26Al is nearly stable with a half-life of 7.2 x 105 years and is only found in trace amounts naturally. Aluminum Crystal Data Lattice Structure: Face-Centered CubicLattice Constant: 4.050 Ã…Debye Temperature: 394.00 K Aluminum Uses Ancient Greeks and Romans used alum as an astringent, for medicinal purposes, and as a mordant in dyeing. It is used in kitchen utensils, exterior decorations, and thousands of industrial applications. Although the electrical conductivity of aluminum is only about 60% that of copper per area of cross section, aluminum is used in electrical transmission lines because of its light weight. The alloys of aluminum are used in the construction of aircraft and rockets. Reflective aluminum coatings are used for telescope mirrors, making decorative paper, packaging, and many other uses. Alumina is used in glassmaking and refractories. Synthetic ruby and sapphire have applications in producing coherent light for lasers. Miscellaneous Aluminum Facts Aluminum is the 3rd most abundant element in the Earths crust.Aluminum was once called the Metal of Kings because pure aluminum was more expensive to produce than gold until the Hall-Heroult process was discovered.Aluminum is the most widely used metal after iron.The primary source of aluminum is the ore bauxite.Aluminum is paramagnetic.The top three countries that mine aluminum ore are Guinea, Australia and Vietnam. Australia, China and Brazil lead the world in aluminum production.The IUPAC adopted the name aluminium in 1990 and in 1993 recognized aluminum as an acceptable option for the elements name.Aluminum requires a lot of energy to separate from its ore. Recycling aluminum only requires only 5% of that energy to produce the same amount.Aluminum can be rusted or oxidized by mercury.Rubies are aluminum oxide crystals where some aluminum atoms have been replaced by chromium atoms.A piece of jewelry in the tomb of the 3rd Century Chinese general Chou-Chu has been found to contain 85% aluminum. Historians do not know how the ornament was produced. Aluminum is used in fireworks to make produce sparks and white flames. Aluminum is a common component of sparklers. References: CRC Handbook of Chemistry Physics (89th Ed.), National Institute of Standards and Technology, History of the Origin of the Chemical Elements and Their Discoverers, Norman E. Holden 2001.

Fate and Chance as Antagonists in Romeo and Juliet essays

Fate and Chance as Antagonists in Romeo and Juliet essays In V.iii.159, Friar Laurence said, A greater power than we can contradict hath thwarted our plan. This quote sums up the reason for basically every bad event that occurred in Shakespeares play Romeo and Juliet . Fate and chance are the two major elements that brought Romeo and Juliet together as lovers, but chance and fate brought them together with intent to use the lives and deaths of the two as part of a larger plan to reconcile the feuding Capulet and Montague families. Although the wrongs created by chance and fate were used to benefit this greater cause of ending the fight between the families, fate and chance should still be considered the greatest antagonists of the play. The meeting of the star-crossed pair, the deadly street fight that resulted in Romeos banishment, and the failure of the Friars letter to reach Romeo are all instances in which fate played an antagonistic role in Romeo and Juliet. Chance is an enormous factor in the beginning of the chain of events leading to the deaths of Romeo and Juliet. Without chance, there exists a very high likelihood that the two would have never met. By chance, Romeo got invited to and decided to attend the party. It was also chance that enabled Romeo to attend the gathering. He was simply walking down the street with his friends when he stumbled into an illiterate servant of Capulet who needed Romeos assistance in reading a guest list for the party. In exchange for his services, Romeo was given this invitation to the event (I.ii.80), My master is the great rich Capulet; and if you be not of the house of Montagues, I pray come and crush a cup of wine. Rest you merry. Also, by this same chance, Romeo decided to attend the celebration. If Benvolio had not mentioned in I.ii.84 that, At this same ancient feast of Capulets sups the fair Rosaline, then Romeo would not have had any desire to go to the party. The...

How Does Gender Affect Overall Job Satisfaction Essay

How Does Gender Affect Overall Job Satisfaction - Essay Example Is there a difference in the overall job satisfaction (OJS) among men and women who are members of the American Intellectual Union? This is the main question that this paper hopes to answer. The sample for this study is composed mostly by males (74%). Standard deviation cannot be computed for gender since this data is nominal. Respondents were asked to rate their overall job satisfaction through the scale of 1 (least satisfied) to 7 (most satisfied). Table 1 below shows the OJS score provided by males and females. Average OJS for the entire sample was computed at 5.172 which is relatively high in the scale. Overall standard deviation is at 0.979582 which means that the variation in the scores for overall job satisfaction is small. However, it is important to note that females registered a higher average overall job satisfaction at 5.27 compared to males (5.14). Standard deviation of OJS scores among males is at 0.97 while variation in the OJS scores in females was computed at 1.20. While both standard deviation scores are low, females registered higher variation possibly due to less sample size. The results of this study is not conclusive because data was limited. Moreover, to determine the connection between gender and overall job satisfaction scores, it is important to run other statistical procedures such as the chi square test or other test for correlation. By using charts, it was easy to see that most female respondents provided higher OJS scores, but that there were too few of them.

Tsunami Disasters Essay Example | Topics and Well Written Essays - 750 words

Tsunami Disasters - Essay Example In particular, the port of Chennai on the east coast of India sustained moderate damage. The local fishing fleet was affected, with a number of boats overturned or washed ashore within the harbor. Overall economic losses from the 2004 Indian Ocean Earthquake and Tsunami disaster are estimated at$10 billion, with 75% of the loss attributed to the damage inflicted by Indonesia, Thailand, Sri Lanka, and India. The Southwestern costal area of the island Hokkaido was affected by the earthquake. The most affected area was in east of island Okushiri and was 100 by 125 kms. Waves soared high. They were from 5 to 12 m high and inundated the area around the island. The highest wave run-up along the southwest coast and was about 30.5 m on a limited area. Most of the deaths were on Okushiri island. The number of missing was expected to be higher because it is a tourist area. Â  540 houses were destroyed by tsunami and fire caused by earth quake, 154 houses and other properties were heavily damaged and 1,826 were slightly damaged. 31 public buildings were damaged and some were severely destroyed. Highways were destroyed in at least 365 locations and Railway lines were completely damaged at 124 locations. Port facilities and all other infrastructure in direct path of tsunami were extensively damaged, including power, water, telecommunications, transportation, and sewage. Tsunami didn’t damag e the sewage treatment plant at Apnea. Naturally high sand dunes protected it The powerful Earthquake of Hokkaido occurred in south west, the Sea of Japan. The earthquake’s epicenter was at a depth of 34 km on the Sea floor and was very close to the Okushiri Island. The island was hit by tsunami in less than 4 minutes after the earthquake and that left no time for the people of the island to evacuate. Many homes were constructed along the sea side which explained the high toll of victims. Despite only

Current and Future Development of Electric Train Essay

Current and Future Development of Electric Train - Essay Example The electric trains were easier to run and cleaner since they did not rely on coal as the source of power. The new electric train was mainly used in Boston, Chicago, and New York. The electric train was shown at an international trade exhibition in 1879 in Berlin (Feedburner 2007). It was long before the electric train was used to carry passengers. The main advantages of the electric train are that there is no pollution and less noise. The other advantages are that electrification results in higher performance, lower energy costs, and reduced maintenance costs. The electric trains are quite as compared to the diesel trains and thus they produce less mechanical noise. The electrical trains also move easily on the tracks thus contributing to the reduced maintenance costs of the tracks (Duffy and Michael 2003). The current state of electric trains in Japan has been one of the major countries which have played a big role in the history and the development of electric trains, especially i n the 20th and 21st century. It is the country which has pioneered railway technologies in the whole world. Currently, Japan has been able to build faster, more accurate and safer mass transportation systems earlier than any other country in the whole world. ...There has been the computerization of the equipment which is used for train traction systems. This has contributed to the improvement of reliability, simplification of maintenance and saving labor. Train management systems have been introduced and this has accelerated the management of information for the whole train system. Current electric trains use an induction motor as the main driving motor and improved AC for circuit semiconductor. The current train also uses VWF inverter as their main control unit. The achievements have promised and proved to be more reliable and cost-effective in the running of the electric train. The current electric train uses JRIS transmission system which has made it realize world standard transm ission protocol. Due to this fact, the current train has higher reliability system and also a higher speed. Today, there is the use of the air compressor unit and the air conditioning equipment which are both electronically controlled. The conditioning equipment particularly has been transformed into a cooling unit that is easily controlled in accordance with the preferred for every power supply. This has improved service quality and comfort to passengers on trains. The current speed of an electric train ranges from 200 to 581km/hr. The current train also uses the circuit simulator. This is an advancement of the microcomputer control features. The stimulator has improved the design verification technology. This advancement has been made as result of the former simulator having limited condition settings in terms of time and labor. There has also been the introduction of the high-speed processor which stimulates the main circuit and the load. The current stimulator uses the frequency of 50/60-Hz.

Dignity Of Women And Domestic Violence

Dignity Of Women And Domestic Violence A lady was crying in the arbitrator room because her husband severely beat him yesterday, the face of the lady was swollen and her hands were injured. It was the case of Domestic violence. Dignity of women should be respected by every individual of the society, because the Women are the equal partner of the society. According to Beijing conference on women Dr Joaquin Navarro-Valls said (1995) The dignity of women is prerequisite to any recognition on the part of the State. Without a clear understanding of the meaning of human dignity, discrimination will never be avoided. But unfortunately such respect and honor could not be maintained and which resulted in an uncompromised issues such as domestic violence. It can be defined as: A continuum of behavior ranging from verbal abuse, physical and sexual assault to rape even homicide. (Department of Health DOH 2000) Domestic violence is the most serious problems that affect the health and wellbeing of the women. It ranges from single injury to life long disabilities. As Marjorie McAtee (2010) mentioned that: Domestic violence can have a number of long-term effects on the women who are often its victims. These effects can extend far beyond immediate injury. It was shocked me when my friend told the story which said lady presented in front of him. The lady told that: I got married at the age of 21 and delivered the first baby girl within the periods of 12 months. On the completion of the second year of my marriage my husband showing irresponsible attitudes towards providing finance and participating in social activities. He starts to abuse language and threaten me; day by day his attitude become worse and he disallowed me to go out even to my parent house. Im so sacred to him. One night he came very late and he was drunk, when I ask the reasons to late and drunk, he come to me and slaps me and start biting me with his belt, its now became his habit to beat , torture and abuse me, many time our neighbors came and intervene us. Im so worried about my baby because I can not give her proper time. I also feel myself unhealthy as physically and mentally. Analysis: Domestic violence is an extended phenomenon. One analysis on the basis of statistics can help us to understand the widespread of this issue. According to Aurat Founadtion press statement: (Feb. 2010). A total of 8548 incidents of violence against women were reported in the four Provinces of Pakistan and in capital territory Islamabad during year 2009. It is not only the nationally spread phenomena but it cross the boundaries and now become the global issue As the Sushma Panday mentioned in her book of Psycho-social aspect of domestic violence: According to UNCIEF study report (2000) 20-50 percent of women population of world is victims of domestic violence. After going through the story, different question has been raised in my mind such as why domestic violence happens? What are the forms of such violence? How it effects on the health of deprived lady as well as other women? And how it can be prevented or avoided? These questions help me to analysis the said story through various literatures. There are different domains or kinds of domestic violence which the victim as well as the under discussion lady has been faced, the first kind of violence is physical abuse in which women are being physically abused by biting, hitting, pouncing, slapping or burning. Another one is emotional or psychological abuse in which women is being humiliated and threaded by spouse. Sexual abuse is a kind of violence in which women is being forced for unsafe or unwanted sex with the same spouse or with others. Femicide is form of violence in which women are killed due gender discrimination; honor killings are one of the examples of femicide. The role of health care provider to identify such form would be helpful to plan smooth treatment process to the women health. According to Wikipedia: All forms of domestic abuse have one purpose: to gain and maintain total control over the victim. Abusers use many tactics to exert power over their spouse or partner. Susan Scott Ricci and Terri Kyle (2008) citied in the book Maternity and Pediatric Nursing that: Nurses play a major role in assessing women who has suffered from some types of violenceà ¢Ã¢â€š ¬Ã‚ ¦a visit to a health care agency is an ideal time for women to be assessed for violence. Besides the forms of such violence there are several causes responsible for domestic violence and these causes answered that why domestic violence happened to the said lady as well as the entire victimized women. The individual who grow in an environment where violence is practice or taught is an essential cause of violence, because such individuals develops and grow his perception or thoughts accordingly. Poverty or low socio-economic status is a prominent cause of violence because when the wants and needs not fulfilled, that resulted in domestic violence. That similarly happens in the mentioned story. Addiction is equally responsible for the said violence, As the Bethany Winkel (2009) citied: Almost 80% of domestic violence crimes have a connection to drugs. Therefore, a big part of the solution to domestic abuse is to address the underlying substance abuse. Mental illness is also responsible for the domestic violence. The mentally unhealthy person unable to cope with situations an d domestic violence resulted. Poor self esteem and power relation or male domination is also the cause of said violence, because in our society men treated as head or dominated part of family as compare to women. The role of health care provider to identify specific causes help to guide the victim to resolve the underlying factor of violence. As the Holly McDowall cited: While nurses can help to prevent further abuse by placing barriers between victims and the abuse, this is more complex than referrals to shelters. After being analysis of causes and forms of domestic violence its essay to understand the affects of such violence to health of the deprived lady as well as other victimized women. As Kristen Fraser citied in article of Domestic Violence and Womens Physical Health: Campbell et al. (2002) argue, based on their findings that abused women have increased risk of gynecological, central nervous system and stress-related health problems. Primarily physical health of the women is severely affected from such violence. Bruises, cuts, burns, scars and fractures are some of the sign of the physical violence. Psychological and mental health is also being affected by such violence, depression; stress, anxiety; suicidal ideations and post traumatic syndrome are some of the unhealthy signs which victim as well as deprived lady has been experienced. When the violence is practiced in front of the children it may affect his /her psychological health as well as leads to building up their negative perceptions, similarly happen in mentioned story. When the victim is physically and psychologically is unhealthy can not enjoy the well beings of life and remain unsocialized from family and friends. When one individual is affected in the society from a domestic violence than the concept of violence society is emerged, because every individual is connected to their society as a member. Therefore domestic violence affected the health and wellbeing of the women as well as entire society. In context of said story or deprived lady; her physical health, psychological and social activity is affected from the violence and on other hand her child is also affected as passive member of violence After having the analysis of forms, causes and affects of domestic violence. It is very important to look forward the ways that how said violence can be prevented or avoid for the deprived lady as well as the all victims. cycle of violence theory which was introduce by researcher and feminist Lenore Walker in 1970 which help to understand such violence It include Honey moon Phase, Tension building Phase, and Acting out Phase putting the lady on that cycle we can analysis that problem has been started gradually that leads to severe one. We can avoid such tensions into tension building phase. Another suggestion and recommendation include that self awareness about rights of women, approached for legal rights and mutual consensus is also some of strategies to stop violence. The role of the nurse to in the said violence is very important as Mary Cipriano and Ruth Ludwick citied: The challenge is what nurses can do about it. Ask a woman if she is fearful of harm. Write a letter or speak to a legislator about domestic violence. Volunteer your skills at a shelter for victims of domestic violence. Open a discussion with a person from another culture about domestic violence. I conclude by saying that the by proper knowledge and understanding of forms, causes effects and preventive methods of domestic violence women can safe from hazardous effects of violence on health and wellbeing.

Effective Leadership and Social Identity Theory Essay -- Leadership

There are many definitions with regards to leadership, but what defines 'effective leadership' and how is it evaluated? Chemers (2000) explained that effective leadership is "follower satisfaction and group performance." (p. 28) G. Yukl expalined "there is no correct definition of leadership; it is only a matter of how useful it is increasing our understanding of effective leadership."(Yukl) How does an organization establish effective leadership? While some leaders of organizations direct considerable resources to find, train, and mentor managers to be effective leaders, many leaders of organizations put little research into the subject of effective leadership. Whatever the organization's policy on selecting the leadership group is, such as to promote from within or to hire from outside, most organization's leaders make decisions without a full understanding of leadership theories. The missing aspect that many leaders and developers of leaders ignore is that the construct of lead ership is not an individual endeavor, but rather one that must include the organization as a whole. Leadership is not just the sum characteristics of an individual (leader) but should include the leaders, the followers, dyadic relationships, and group relationships. Hogg and Terry (2000) explained that "organizations are internally structured groups that are located in complex networks of intergroup relations..." (p. 121). Leadership directly impacts an organization's bottom line, employee satisfaction, and turnover; it can impact how the organization is viewed by society and in particular its marketing audience. This is particularly significant during a downturn in economic markets. Organizations must meet budgetary controls, and need to communicate... ... M. & Terry, D. (2000). Social identity and self-categorization processes in organizational contexts. Academy of Management Review, 25, 121-140. Lord, R. (2000). Leadership. In A. E. Kazdin (Ed.), Encyclopedia of psychology, vol. 4. (pp. 499-505). Doi:10.1037/10519-216 Reicher, S., Haslam, S., & Hopkins, N. (2005). Social identity and the dynamics of leadership: Leaders and followers as collaborative agents in the transformation of social reality. Leadership Quarterly, 16, 547-568. doi:10.1016/j.leaqua.2005.06.007 Hogg, M., & van Knippenberg D. (2003). Social identity  and  leadership processes  in groups. Advances in Experimental  Social  Psychology,  Volume 35,  1-52. Yukl, G. (2002). Leadership in organizations. Upper Saddle River, NJ: Prentice Hall. p. 1-19. Retrieved from http://www.blackdiamond.dk/HDO/Organisation_Gary_Yukl_Leadership_in_Organizations.pdf