Didnt choose one yet , need the writors help choosing it for me Research Paper

Didnt choose one yet , need the writors help choosing it for me - Research Paper Example Fanatic missionaries like Sheikh Youssef al-Qaradawi provoke the hatred of the Qatari people of the support the Qatari government gives to American policy and involvement in Israel.2 Banished Saudi Salafist associated with the Qatari elites were accommodated in Qatar and accepted into religious organizations and the Interior Ministry after the raid on Mecca’s Grand Mosque in 1979. Sheikh Abdallah bin Khalifa al-Thani, the previous Interior Minister, was assigned from the Wahhabi group inside the Qatari institution.3 Even though Sheikh Abdallah was removed from his post, this group is still rooted among Qatari security officers. Salafists are being removed from the Interior Ministry or are being weakened by newly formed security organizations like the Internal Security Forces and the State Security Agency.4 As this effort continues, these organizations may become effective in fighting terrorism activities. The major sources of terrorism in Qatar are not likely to weaken in the near future, or after economic and political liberalization, implying that oppressive policing strategies will be the primary method used to stop terrorism. With the Interior Ministry ruled by Sheik Abdallah bin Nasser bin-Khalifa al-Thani, one of the supporters of the emir, and the Internal Security Forces and the State Security Agency directly under the emir, Qatar’s internal security is expected to be sufficiently supported and funded in the near future.5 The intelligence agency of Qatar is fast restructuring to fight terrorism, reporting satisfactory effectiveness in the investigation and prosecution of two Russians suspected of killing Yandarbiyev. Qatar will get substantial security support from Western countries if the new security agencies successfully accomplish their readjustment effort.6 Still, threat of terrorism continues to be a major problem. Al-Qaeda has terrorized Western people in Qatar. The Australian government’s Department of Foreign Affairs and Tr ade (DFAT) even warned tourists â€Å"to exercise a high degree of caution in Qatar†7 because of serious terrorist threats. The DFAT said they were informed of plans to terrorize several individuals and groups in Qatar. On the 19th of March 2005, a suicide car bombing in Doha took the life of a British individual and wounded several other individuals.8 On the 17th of March 2005, the Saudi leader of Al-Qaeda, Saleh al-Oufi, declared a war on terrorists in Qatar and in other nations like Oman and Bahrain. However, the March 19 incident was not surprising. More terrorist attacks are likely to occur and concentrated on easy targets like emigrants.9 The Al-Qaeda in the Arab region is definitely trying to terrorize the Gulf States. The United States is still trying to improve counterterrorism collaboration with the government of Qatar. Working with U.S. officials on counterterrorism is still in progress, and Qatar approved firm counterterrorist finance (CTF) policy.10 However, Qata ri attempts to fight terrorism, especially terrorist financing, beyond its boundaries by charitable groups and private organizations were generally unsuccessful in terms of established global criteria. Qatar’

UpBeat Inc. ( Case Study ) Example | Topics and Well Written Essays - 1000 words

UpBeat Inc. ( ) - Case Study Example According to the provision 1, bank needs to take permission from Upbeat Inc to sell its receivables in case of default also which is not the right accounting practice. It is totally against the principal of US GAAP. The bank has full statutory authorities to sell different receivables of Upbeat Inc in case of company’s defaulter situation. Once the company announced its incapability to repay bank loans then the bank can sell all receivables without any prerequisite permission. According to accounting principal this is considered as breach of trust or failure of agreement between two parties. Under this situation bank’s money is there with the company and the company is not returning it unreasonably (Sherman, 2011). This situation gives full authority to the bank to sell all receivables of the company without any permission. According to ASC, the bank needs to monitor the financial conditions of borrowing Upbeat. It has to observe whether the company is trying to pay bac k its money or not. Here in this case the company is withholding bank’s money unreasonably. So, there is no need to take any prior permission to sell or pledge their receivables. But here in this provision opposite thing has taken place. In the designing of this provision all the required standards of ASC has not been followed. This provision is not supporting various accounting standards. So, all the above arguments are stating that provision 1 of transfer agreement does preclude sales accounting. Here in this case, Transfer Provision 2 will not preclude sales accounting. According to this provision of transfer agreement Upbeat can repurchase their all receivables in future at a fixed price. According to GAAP of USA, Upbeat can come to an agreement with the bank where both parties will agree upon a fixed price against which the company will get back its receivables from the bank. It is a very suitable principal for Upbeat Inc. Due to this

Water Shortage In New Zealand Essay Example | Topics and Well Written Essays - 5000 words

Water Shortage In New Zealand - Essay Example This research report contained valuable information which included statistics (numerical data) as well as textual information such as information about the websites visited for accessing the data on Territorial Authorities in New Zealand and their various policies and approaches with regard to water supply in the country. Hence in order to enable ease of data recording, interpretation, and analysis, the decision to use and design the excel spreadsheet was made. Another crucial task was to ascertain the number of questions to be asked. For this purpose first, a tentative list was prepared and matched against the research objectives. Based on this criteria a final list of questions was shortlisted. This included a range of information on water supply in the country categorized on the basis of territorial authorities (TAs). A total of 70 TAs were shortlisted and questions such as whether the said TA offer advice on water conservation; whether they have a water meter in place, how much a mount of water is supplied to individuals as well as industries; whether the TAs have any plans to implement a water restriction; the existing state of water charge across all TAs etc., and among others. This paper makes a conclusion that the key purpose was to ensure that the questions asked helped in answering the broader research objective. The list of questions compiled was extensive and comprehensive and enabled access to crucial information regarding the state of water supply in the country.

Moral Self-Knowledge in Kantian Ethics Essay Example for Free

Moral Self-Knowledge in Kantian Ethics Essay In the article titled, Moral Self-knowledge in Kantian Ethics, Emer O’Hagan discusses Kant’s views and ideas concerning self-knowledge and the role it plays in duty and virtuous action. O’Hagan first introduces a key feature of Kant’s ethical theory which is its recognition of the psychological complexity of human beings. O’Hagan uses this recognition of psychological complexity by Kant to dive into Kant’s feeling on self-knowledge. Once a basic understanding of Kant’s attitude towards self-knowledge has been established, O’Hagan then uses Kant’s ethical theory to show how self-knowledge can be used as a means to help determine the goodness of an action. The arguments presented by O’Hagan are logical and clearly supported and verified through the presented evidence. Kant is shown to have recognized the psychological complexity of the human being in recognizing that, â€Å"judgments concerning the rightness of actions are vulnerable to corruption from self-interested inclination† (O’Hagan 525-537). Kant is saying that that even though an action may start out as from duty, our internal feelings as human beings can create a beneficial end as a means for the action, thus rendering it not from duty. Kant also recognizes that our own judgments about us may not be accurate. Moral self-development is a practice to develop accuracy for our self-judgments and takes into consideration one’s motives for action. O’Hagan tells us that this moral practice requires moral self-knowledge which is a form of self-awareness disciplined by respect for autonomy, the theoretical foundation of Kantian ethics. According to Kant, the first command of the duties to oneself as a moral being is self-knowledge. This is the ability to know yourself in terms of whether your heart is for good or evil and whether your actions are pure or impure. Kant describes duties of virtue to be wide duties, in that there is not a clear standard for how one should go about performing action for an end that is also a duty. O’Hagan tells us that Kant’s duty of moral self-knowledge is the duty to know one’s own heart. Kant tells us that moral self-knowledge is quite difficult because it involves abstracting, or taking a non-biased analysis of one’s self. Because we are bound to our own feelings and inclinations, we cannot completely separate ourselves from our own bias. The power of self-knowledge is the power to see things in objectivity instead of subjectivity. The final step of the argument is relating self-knowledge to determining the goodness of an action. O’Hagan tells us that developing self-knowledge will develop one’s self-understanding and will develop guards against self-deception. Using these skills to truly understand one’s heart allows for one to know one’s motives, and thus practical stance in action. According to Kant, the goodness of an action is determined by one’s motives, so the goodness of one’s action can now be evaluated. O’Hagan clearly demonstrates the importance of self-knowledge in Kant’s theory of ethics and validates its importance by describing application for use of the practice of self-knowledge (O’Hagan 525-537).

The History Behind Hate Crime and the Existing Legislation Essay

The History Behind Hate Crime and the Existing Legislation Many political scientists and researchers to a number of policy arenas in the United States ranging from corporal punishment to the quality of urban life have applied Daniel Elazar’s concept of political cultures. For a vast majority of these policy programs, a considerable correlation has been found to exist between the region examined and its approach to a specific policy. Elazar focused on three primary political cultures: the Moralist political culture (MPC), the Individual political culture (IPC), and the Traditional political culture (TPC). These cultures have served as a basis for explaining the difference that exist in the political, social, and personal facets of each respective region. These ideas have been consistent throughout the course of this nation’s history, existing even in present times. I have chosen to focus on a policy program that has demanded a great deal of attention in more recent times, namely in the past few years: hate crime policy. With mor e widespread media coverage, hate crimes have become more prevalent and more publicized than ever before. The Benjamin Smith shootings and the murder of Matthew Shepard are only two examples of recent crimes, which have been considered hate crimes that have promoted politicians and legislators to address this ever-growing problem and formulate a solution. This paper will attempt to define and uncover the history behind hate crime and the existing legislation. Furthermore, I will explain my own hypothesis then examine regional difference in the approaches to hate crimes and compare and contrast them to Daniel Elazar’s idea of political cultures. My own hypothesis is that moralist cultures will have been the first to initiate hate crime policy and be most likely to have such policies followed by individualist, then traditionalist political cultures. Hate Crime: Definition and History Every since the body of James Byrd was found in pieces on a road in east Texas, the authorities have been struggling to bring charges to reflect the horror of the crime. â€Å"Murder seems too pat: Mr. Byrd was chained to a truck and dragged for almost three miles†. In Texas, simple murder does not carry the death penalty. But Mr. Byrd was black, apparently murdered by racists, so there is a call for this killing to be labeled a â€Å"hate crime†, for whi... ...tiation of Hate Crime Law in the United States, 1978 to 1995: Innovation and Diffusion in the Criminalization of Bigotry.† American Sociological Review. April, 1998: 286-307. 4. Haider-Markel, Donald P. â€Å"The Politics of Social Regulatory Policy: State and Federal Hate Crime Policy and Implementation Effort.† Political Research Quarterly. March, 1998: 69-88. 5. â€Å"An Unwise Road in Texas.† The Economist. 20 June, 1998: 17. 6. â€Å"The Hate Debate.† The New Republic. 2 November, 1998: 7-8. 7. â€Å"1999 Hate Crime Laws: Anti-Defamation League.† URL: http://www.adl.org/99hatecrime/constitutionality.html 8. â€Å"The White House Conference On Hate Crimes.† URL: http://www.whitehouse.gov/Initiatives/OneAmerica/whc.html 9. Elazar article 10. U.S. Census Bureau Statistical Abstracts of the United States: 1998. â€Å"No. 344- Hate Crimes- Number of Incidents, Offenses, Victims, and Offenders by Bias Motivation: 1996.† Statistical Abstract of the United States: 1998. 21 September, 1998: 215. 11. Wirt Lecture 12. Sharkansky article. 13. â€Å"Map of State Statutes: 1999 Hate Crime Laws.† URL: http://www.adl.org/99hatecrime/provisions.html

Christian Dior

Did you know there was another world war after World War II? It brought the American and British government into the fashion world. They were faced against Christian Dior and The New Look of 1947. As he brought out the infamous hourglass figure on to runways, it sparked a fire in pop culture. The look gave women around the world femininity and featured their cinched waist, accented bust and fulfillment pleated skirt. With the launch of Door's first collection, in February 1947, he turned the fashion world upside down with a bold stroke.Christian Dior (19051957) founder of Dior Company, commonly known for selling French luxurious goods was a very gifted man. As Europe was overcoming the horrors of World War II, Dior presented his very first collection to the press at 42. After 6 horrible years of women wearing gloomy, tasteless clothes, Dior wanted to give them their taste back with lightheartedness and the art of seduction. The style of the suits and dresses focuses on soft shoulders , a sleepyheads bodice, a narrow waist, and a full skirt flaring out from the hips to touch the medical.The deteriorating of Harpers Bazaar Caramel Snow had extreme faith in the designer as she exclaimed, â€Å"It's quite a revolution, dear Christian! Your dresses have such a new look! † at his first show. She then cabled the brilliant slogan to her editor, and within two days, it caused shock waves to pass through both sides of the Atlantic. Women all around the world raced to have this fashionable, elegant suit made for themselves. America and Britain were not happy because during the war, there were government regulations that dictated men and omens fashion.Women were given a lean, boyish silhouette 10 years prior to WI and now the women's figure had become exaggerated and glorified. The material needed for the skirts and coats were excessive amounts and you would need several yards of fabric Just to make the petticoat. American and British government tried to persuade wom en not to wear The New Look and many women criticized it by saying it was wasteful, expensive and unpatriotic. Britain had tried to deny it existed and their government banned Vogue from publishing about The New Look orDior in the world renown fashion magazine. In France, Britain and the US, if you were found wearing The New Look, on the street you would be harassed if you were an early wearer. In America, there was disapproval of the very idea of importing from abroad. Not only did the government fight back towards Dior, but citizens started to do the same. While Dior was on his American tour to promote his line, he was pushed away from the Chicago train station by angry housewives who were holding signs up saying things like â€Å"Burn Monsieur Dior! â€Å", â€Å"Christian Dior go home! . He had similar encounters in Louisville, Loadable, and Georgia. But there were few exceptions. The British Embassy held a secret session in Paris in 1947, where Princess Margaret was shown Do or's creations for her and her sister for social events. The New Look had soon become about opulence and wealth, and though only the opulent could wear it, he brought color after the dark days of the war Just using a few strokes of a pencil. As Dior lived his golden years from 1947 to 1957, he had evolutionism fashion and brought back elegance to the fashion industry.Though The New Look was extremely controversial and expensive, it went world wide within one short week. By spring of 1948, The New Look had worked its seductive charms and the extravagant dresses were absolutely everywhere. The New Look slowly grew on both Britain and the US as it proved that it was making citizens happier and giving out Jobs. â€Å"Women, with their sure instincts, realized that my intention was to make them not just more beautiful but also happier,† Dior later said. Christian Dior Christian Dior The Dior Couture fashion house was founded in 1946 by the French designer Christian Dior. Dior was the most influential designer in the 1950’s and held his first couture fashion show on 12th February 1947. The collection consisted of a range of luxurious clothes, soft shoulders, narrow waists and full flowing skirts. This was to be named the New Look. (Fig 1) ‘The New Look’ 1950’s The New Look was a new concept on life for the post-war era. Dior was correct to assume people wanted change after the deprivations caused by the war.Before the new look, women had to ‘make do and mend’ with the materials that were available; fashion consisted of square shoulders and straight knee length skirts because of wartime restrictions. The New Look was a return to the traditional concept of femininity and glamour. After women had been limited to little availability of materials during the war time, they were now able to buy fabrics such as silk and cotton. (fig 2) ‘Make do and mend’ 1940’s war time fashion Dior’s couture house was overcome by orders from all around the world as the New Look became a global success.Dior had revived the fashion in Paris for the greater good and presented the new look in places such as America and to the British Royal Family in London. He was then guaranteed success and recognized as having shown a true work of excellence. Throughout the 1950s, Christian Dior was the biggest and best-run haute couture house in Paris. Christian Dior produced more fashion collections between 1954 and1957 which proved to be very successful, yet none of these were as acclaimed as the New Look. As the most famous couture house in the 1950s, Dior attracted a lot of talented assistants.One was Pierre Cardin; an Italian born tailor who showed a lot of potential and strive for fashion before leaving in the late 1940’s to start his own business. Another designer that worked closely wit h Dior was his young assistant Yves Saint Laurent. After joining the company of Dior in 1955, Yves Saint Laurent flourished and expressed his love for fashion which was noticed when he contributed thirty five outfits for the autumn 1957 collection. In 1947 the Dior Company was to launch its first perfume, called Miss Dior, the perfume was a big success!From 1947 until 1950, a Christian Dior perfume branch was established and a new ready-to-wear house was also founded in New York at the corner of Fifth Avenue. In 1949, the new look line made a profit of 12. 7 million francs. Dior died suddenly 1957, which left the company deciding whether to close the fashion house or not, but the company decided against this due to financial stability and wanted to revive the company to what it was before. (Young designer) Yves Saint Laurent was to become head designer for the fashion house.Yves Saint Laurent created an outstanding collection in just nine weeks. Yves Saint Laurent was only 21 at the time; Laurent still kept Dior’s style the same but decided to use softer fabrics making them easier and more realistic to wear. Yves Saint Laurent took an opportunity to express his own ideas, no longer taking influence from Dior’s designs. Saint Laurent was designing for Dior in a time of a more youthful era and captured this in his designs for Dior. Yves Saint Laurent expressed a vibrant theme and conveyed a balance of admiration and outrage.In 1960 Yves Saint Laurent designed The ‘Beat Look’ for Dior, this collection was unsuccessful. The collection consisted of high pullovers, knitted caps, leather suits and coats. This was too radical for the fashion world. In 1960 Saint Laurent was ordered to serve in the French Army, during this time the owner of the House of Dior decided he would be replaced. ( fig 3) ‘The beat look’ Yves Saint Laurent 1960 Marc Bohan replaced Yves Saint Laurent between 1960- 1989. Marc Bohan brought a new outlook to the house of Dior by rejecting contemporary fashion; he took inspiration from Christian Dior’s 1920s designs.He was publicly praised by Rebecca Arnold as the man who kept the Dior label â€Å"at the forefront of fashion while still producing wearable, elegant clothes. † In January 1961, Bohan released a collection, which consisted of waistlines dropped; flared skirts embellished with fur stoles and also incorporated Dior’s traditional beading and embroidery. Bohan attracted a lot of famous social figures to his collection such as the actress Elizabeth Taylor who ordered twelve dresses from the spring-summer 1961 collection featuring the â€Å" slim look† ( fig 4) Mark Bohan ‘ the slim look’ for Christian Dior 1960’s ttp://blog. fidmmuseum. org/. a/6a01156f47abbe970c0168e56ae3ad970c-800wiSaint Laurent’s designs where very different from Marc Bohans. Bohan had different aspirations and ideas than Saint Laurent, as he wanted to tak e the company back to its original house style whereas Yves Saint Laurent wanted to voice his own ideas and not taking inspiration from what Dior actually wanted. In 1989 Bohan left Dior, before joining for the house of Norman Hartnell in London, where he worked for the label until 1992.Bohan has since designed under his own name. ( fig 5) Chrisitan Dior by Gianfranco Ferre- Fall 1989 Couture In 1989 Gianfranco Ferre decided to agree he would become head designer for Dior. His first haute couture collection was shown In July 1989, just two http://media-cache-ec2. pinterest. com/upload/44191640064762754_fdMj30cl_b. jpgmonths after Ferre’s arrival at Dior. Some people saw his move to the French fashion house outrageous because he was not French and where undecided if he could prove himself as a success at Dior.It turned out that Ferre proved everyone wrong and his designs became known all over the world. Ferre had a deep understanding of fashion history and that was shown in hi s work. He was very careful when designing for Dior, making sure it was what Christian Dior would have wanted, he showed a lot of similar attributes to Dior himself such as a caring attitude, attention to detail and a passion for all things luxurious, elegant and beautiful (fig 5) Eva Peron wearing a Dior Dress- 1950. fig 6) 195 S/S 2010 floral collection By Galliano by Dior (fig 7) http://upload. wikimedia. org/wikipedia/commons/thumb/2/29/Evita_Dior. jpg/200px-Evita_Dior. jpg Gianfranco Ferre inspiration at Dior was Eva Peron who was also one of Christian Dior’s original customers. Eva Peron was the first lady of Argentina to wear a dress by Dior in the 1950s. She and Dior both adored each other. http://www. wearefreshfish. com/blogg/wp-content/uploads/2010/07/00210m. pgAnna Wintour and CEO Arnault (editor in chief of Vogue) made a conscious decision to appoint British designer John Galliano to replace Gianfranco Ferre in 1997. This once again caused controversy in France b ecause Galliano was not a French designer. Arnault once quoted â€Å"talent has no nationality† and he even compared Galliano to Christian Dior himself. Galliano showed creativity beyond any other designer and a talent very close to Dior. He created a mixture of excitement, romance and femininity – a few things Dior honoured the most.Galliano showed raw talent and whilst at Dior he brought the company to life with his use of colours, texture and creativity which no other designer had shown at Dior. He was praised by many for his unique ability, which was different to any other designer at Dior. Galliano wanted to bring life to the house of Dior with his flamboyant nature. Whilst other designers wanted to refer back to old designs of Dior and keep the look simple but still elegant, Galliano wanted to express excitement in his collections.In May 1998 another Dior boutique was opened in Paris and also in New York City. This was the first time Paris would witness the openi ng of a Parisian Dior Boutique which was very exciting for the company. The following year the perfume ‘J’adore’ was released which became well known across the world, but not only in Paris. On 5th October 1999, Galliano released the Dior Spring/Summer collection 2000- Ready- To-Wear fashion show, the show consisted of saddle bags. Galliano was promoted to extend his thinking into accessories, advertising and communication for the company.The first advertisement under Galliano’s influence was photographed by Nick Knight featuring a provocative image of two girls stimulating intercourse which then became known around the world and other fashion company’s started to use sex as advertisement porn chic. Galliano utilized his time at Dior wisely by making the company’s name famous globally through his release of accessories such as watches and fragrances. In 2001 Galliano began to release his own Dior watches with the start of the â€Å"Chris 47 Aluminum† line, this created an exciting era in Dior.The watches he released were a big hit; some were only a one off collection. When the Dior 66 watch was released people were shocked because it was going against Dior’s femininity. By 2002, 130 boutiques in different locations were in full operation. Dior Fine Jewelry also launched her own watch name â€Å"Le D de Dior† resembling the collection of fine Jewelry. Not only did the company produce feminine watches but masculine as well. The company was not just aimed at femininity anymore but wanted to provide for men also. In 2006, the Dior watch booth

Energy Harvesting and Nanotechnology

Energy Harvesting and Nanotechnology| April 28 2011 | Energy harvesting generators are attractive as unlimited replacements for batteries in electronic devices and have been the focus of new researches for past years. This paper reviews the principles behind this technology and their integration to harvest energy. Also proposes a greener alternative for the production of quantum dots before the integration to new technologies. | Nanowires and Quantum Dots| Energy Harvesting with Nanowires and Quantum Dots Introduction Harvesting energy is the core of our modern human existence. We need to power our cars, homes, and personal electronics. T o power our technology we need energy. Most electrical energy is harvested in one of two ways. These ways are mechanically harvested or harvested from solar power. Mechanically harvested energy needs moving parts, for example, to turn a generator. Solar energy can be harvested through solar cells via the photoelectric effect. As technology becomes smaller and more compact, power conversion technology needs to also adapt to this changes. Nanotechnology has shown great promise to become the power generator for future nanotechnology. 1 That is the purpose of this paper to show how this technology works and is integrated to the production of energy. Nanowires have a diameter in between 20 nm and 100 nm. They can be made from many types of material, however most research is being done on silicon nanowires1-2 3 4 5 6 ; carbon and CdS/CdTe7 nanowires also are being researched. These nanowires can convert solar energy into electrical energy with enough efficiency to power small devices. This technology can create self sufficient nanotechnologies that do not need batteries or need to be connected to a power source. This new technology will be completely different to the macro-technology we have today, were we have to change out batteries or plug them into a wall. Self-sustaining technology is very green, because they do not need a non-renewable outside energy sources. Quantum dots are being researched as a viable alternative to silicon based solar cells. Quantum dots are small particles, or â€Å"nanoparticles†, of a semiconductor material, most common chalcogenides (selenides or sulfides) of metals like cadmium or zinc (CdSe or ZnS), which are usually from 2 to 10 nanometers in diameter. Because of their size, quantum dots display unique optical and electrical properties that are different in character to those of the corresponding bulk material. The most relevant of these is the emission of photons under excitation, which are visible to the human eye as light. Moreover, Quantum dots can be tuned to certain wavelengths based on their size and are able to produce more than one electron per absorbed photon. These molecules are generally made out of CdSe and are cheap, their synthesis is relatively green, and they have great stability over many years. They do not bleach like other dyes and their efficiency does not fade nearly as quickly as normal dyes. 7 Nanowires and quantum dots have become very interesting topics in chemical research. They have potential to start a new wave of technology and may be the future power source of almost every technology. This article is about how scientists can harvest solar power on a nanoscale, with quantum dot technology showing much promise as a green solution. Solar Power. Today, solar power is harvested by large photovoltaic cells (a solid state electrical device that converts the energy of sunlight directly into electricity) that are made of crystalline silicon; the generation of electricity from the sun was a landmark in Green Chemistry. However, these large panels are bulky and expensive. Silicon nanowires use the same mechanism for power generation, but are smaller and more portable. The coaxial silicon nanowires operate by using coaxial shells selectively doped to absorb photons and produce electrons. 1,3 Coaxial silicon nanowires have 2 shells and a core, figure 1 shows the nanowire and a view of the cross section of the nanowire. Figure 1. The blue outer shell is the n-type shell, the inner yellow shell is in the i-type shell, and the pink core is the p-type core. The diagram on the right shows how the holes (h+), and the photo generated electrons (e-) flow across the nanowire. (Adapted from figure 1 in Nature 2007, 449, 885-889) The outer shell is crystalline in structure which enables the wire to absorb photons. The semiconductor material construction made this nanowire operate like a diode. Diodes allow current to flow one way but not another. Diodes are very common in household electronics and circuits. This means that self-powered circuits can be created from these nanowires. , 3-4 Quantum Dots are able to emit three excitons from one photon through an effect called the Multiple Exciton Effect. An exciton is an electron and its hole. Quantum dots can be tuned to many different wavelengths of light, because the wavelength they absorb is based on the diameter of the dot. The material for quantum dots is more cost effective than silicon-based solar panels. Theoretical limits for power conversion efficiency are approximately 60% 7. This is an amazing efficiency, but there are some debates about how true this efficiency is. There is not much known about quantum dots still, the organic outer layer that is used to separate these particles seem to have photo-electronic effects as well. Figure 2, shows an experimental power generator utilizing quantum dots and a mechanical piezoelectric generator. Figure 2 This is a power generator that uses both solar and mechanical means to harvest power. The quantum dots are interlaced in the ZnO nanowires. The solar cell power conversion efficiency of this device was 15. 8%. Unfortunately, the process of making heavy metal quantum dots is not very green. Some processes require high temperatures and heavy material loss. Current production methods have seen some LCA assessments of quantum dots. There is a lot of waste developed during the production and purification of quantum dots. Mass-by-mass comparison with silicon solar cells, show that quantum dots require far more energy and solvent. However, since only a small amount of quantum dots are being used in technology and the long lasting and high efficiency of power generation gives quantum dots a better assessment in all environmental aspects except heavy metal emission. Since emerging technologies rapidly change, this assessment could be outdated in six months with a new greener synthesis. Proposal Greener QDs: Cadmiun free quantum dots In many parts of the world there are legislation that restrict and in some cases ban heavy metals such as Cd in many household appliances such as Lighting equipment , Electrical & electronic tools, sport telecommunication equipment and entertainment devices. Many reports have shown that cadmium-based QDs were toxic at the tissue and cellular levels when their surfaces are not carefully functionalized. 1, 12 CuInS2 is a direct band gap semiconductor material with a band gap of 1. 45 eV. Thus, by tailoring their composition and size, it is possible to fabricate CuInS2 QDs that emit from the visible to near-infrared (NIR) region, with high quantum yield. More importantly, CuInS2 QDs are more suitable for biomedical imaging applications and integration in household devices because the particles are free from toxic elements such as cadmium, lead, mercury. The properties of these nanoparticles are very similar to those of CdS quantum dots, but the overall efficiency and shifts in spectra are still lower that the ones obtained by cadmium QD’s. More research needs to be done to increase the overall properties of this nanoparticles and their integration to electronic devices, but some ideas that are being currently tried are coating CuInS2 with organic materials that enables the particles to be more efficient and increases their luminescence. Currently this QD’s are being mass produced for example by Nanoco is a nanotechnology company located in Manchester, United Kingdom that uses a molecular seeding method adapted for other compound semiconductor materials, which have similar optical properties to those of CdSe quantum dots (such as the family of III-V materials), but do not contain heavy metals. So the possibilities for the implementation of this technology on devices that are in constant contact with humans are infinite, if new alternatives like this are implemented in future designs. Conclusion Self-sustaining technology is the end goal for these nanogenerators; this can lead to a green revolution in technology and reduce the emissions into our atmosphere. Currently, quantum dots are beginning to show amazing properties that may one day replace batteries and carbon- based energy production. Unfortunately, the current process for the synthesis of quantum dots generates too much solvent waste and uses too much power, but there is research trying to quantify the environmental impact and reduce it. Since quantum dots are an emerging technology, the production and utilization may drastically change in the coming years and hopefully a strong emphasis on low environmental impact will be on the forefront. Meanwhile this technology is being introduced in the solar energy production and medical procedures like targeting cell and biomarkers, giving results that promise a change in the way energy is produced. References 1. Tian, B. Z. ; Zheng, X. L. ; Kempa, T. J. ; Fang, Y. ; Yu, N. F. ; Yu, G. H. ; Huang, J. L. ; Lieber, C. M. , Coaxial silicon nanowires as solar cells and nanoelectronic power sources. Nature 2007, 449 (7164), 885-U8. 2. Peng, K. Q. ; Wang, X. ; Lee, S. T. , Silicon nanowire array photoelectrochemical solar cells. Applied Physics Letters 2008, 92 (16). 3. Sivakov, V. ; Andra, G. ; Gawlik, A. ; Berger, A. ; Plentz, J. ; Falk, F. ; Christiansen, S. H. , Silicon Nanowire-Based Solar Cells on Glass: Synthesis, Optical Properties, and Cell Parameters. Nano Letters 2009, 9 (4), 1549-1554. 4. Tian, B. ; Kempa, T. J. ; Lieber, C. M. , Single nanowire photovoltaics. Chemical Society Reviews 2009, 38 (1), 16-24. 5. Tsakalakos, L. ; Balch, J. ; Fronheiser, J. Korevaar, B. 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