Electron Microscopy Coursework Example | Topics and Well Written Essays - 5000 words

Electron Microscopy - Coursework Example A selected area aperture is inserted into the back focal plane of the objective lens to select the required beam. When the direct beam is selected, a bright field image is formed, and when the diffracted beam is selected, a dark field image is formed. Bright field image The given micrograph shows a bright field image of a MgO crystal. The crystal specimen appears dark with a bright background. The background appears bright because only the direct beam of transmitted electrons is selected and let to pass through the aperture. The surface topology and the raised texture on top of the crystal are clearly observable. This kind of image is obtained by placing the objective diaphragm or the selected area aperture in the back focal plane of the objective lens. The aperture allows only direct beam to pass through while blocking the diffracted beam. The direct beam appears as a bright central spot. The aperture also maintains the collection angle. As seen in the ray diagram below, the objecti ve aperture blocks the diffracted beam, allowing only the transmitted beam to reach the image plane. Darkfield image The given micrograph shows a dark field image of a MgO crystal. The crystal specimen appears lighter than the background. The background is dark. The edges of the crystal are highly pronounced.   In case of the dark field imaging, also called as the central dark field operation, the selected area aperture is not shifted, but the incident beam is tilted to allow the scattered electrons in the diffracted beam to pass through the objective aperture. A collective ray diagram for both bright field and dark field imaging is given below: Selected Area Diffraction Pattern The given micrograph shows the selected area diffraction pattern of a MgO crystal. The lattice structure of the crystal is easily decipherable from the given SAED pattern. Diffraction from a single crystal in a polycrystalline sample can be captured if the aperture is small enough and the crystal is large enough. To obtain such a pattern, the selected area aperture is placed in the image plane of the objective lens and used to select only one part of the image. Using projector lenses to focus on electron beams to obtain small spots on the object surface, the diffraction patterns can be obtained. Using this pattern, the lattice of crystals can be easily studied and it is also possible to determine the orientation relationships between grains or even different phases. 2. (a) From a lattice image obtained from a single crystal of BaZrO3 (Fig. 4) determine the magnification. Compare this with the magnification obtained using the scale bar. Calculate the length the scale bar should be. To calculate the magnification from the lattice image given, the following formula for magnification is used: Magnification (M) = A stepwise solution for the given problem is presented below: Step 1 Calculation of pixel to cm ratio: The size of the image is measured in pixels and centimeters and found to be: Height in pixels= 556 pixels= 14.7cm

Most important events in the history of Los Angeles Essay

Most important events in the history of Los Angeles - Essay Example The main objective of the report is to be able to present certain events in the history of the city of Los Angeles to achieve the present condition of economy and social status that it has now. One of the important events in the history of Los Angeles is the discovery of oil credited to Edward L. Doheny in 1892. Although prior to the said event there are indications of the knowledge of the people and settlers regarding the said deposit, Doheny is responsible for making the deposit known. The said event initialized the economic growth of the city when a large number of oil companies decided to invest and settle in the city limits if Los Angeles (La Botz 41). The importance of the said even lies on the significance of oil in the economy of the city. From the onset of the oil industry in Los Angeles, a number of other industries started to develop and helped the state of economy of the city. Another even that can be considered important in the history of the city of Los Angeles is the establishment of the Pacific Electric Railway. Through the said mode of transportation, the economic transactions and works of people are accomplished in a shorter period of time. In addition, being one of the basic necessities for traveling, the said form of public transportation aid the socio-economic state to improve. The Pacific Electric Railway covers the Southern California area in the 1920’s, connecting Los Angeles and Orange Counties (Henstell 13). Another event that can be considered to improve the economy of the city of Los Angeles is the establishment of the harbor in 1907-1909. The said even ushered the rise of related industries such as fishing, canneries, oil drilling and shipbuilding. These industries resulted in the improvement of commerce in the city specifically due to the fact that harbors are major sites of trading activities. The increasing number of related industries can also be considered in the increase in the

Analyzing and contrasting data mining based network intrusion Essay

Analyzing and contrasting data mining based network intrusion detection system - Essay Example The objective of this research is to acquire a better insight about Data Mining-Based Network Intrusion Detection Systems. In this present era the computers are sophistically connected to each other in a form of network. In such networks there is every possibility of intrusion to important data. In order to maintain the integrity, network data has to be secured. Electronic commerce (e-commerce) has made Internet usage most important part in everyone’s life and has become a major source of sending and receiving information. However, providing protection to the computers connected in a network is still a main issue to be tackled. In general, every organization wants their data to be safe and secure from the attackers. Information systems are easily accessible and can be intruded by the hackers over the internet if the networks are insecure. In this thesis, there are some procedures mentions for detecting network intrusions using data mining. This thesis also covers the different types of intrusions and justify how they can be best detected using available data mining tools. Data mining can be proved as a very useful method towards identifying any intrusion that might have taken place. The amount of extraction or hacking of data and intrusions are growing day by day. As a result, new intelligent Intrusion Detection Systems (IDSs) are put in place to mitigate the intrusion and safeguard the data. Intrusion needs to be detected as we cannot stop intrusions but we can minimize them and stop hackers from threats. Declaration I certify that this thesis is carried out in partial fulfillment of the requirements for the degree of Masters in Computer Science, and has no contents copied from any external sources except for those whose references are made with in the text. ---------------------------------- ------------- Mohammed Altaf Ahmed khan Date Table of Contents List of Figures Figure 2.1: Transition from Data to Knowledge (Fayyad, Piatetsky and Smyth, 1996) 10 Figure 3.1 Snort High-Level Processing Stages (Wheeler, 2003)†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦20 Figure 3.2 Bayesian Model Diagram Panda & Patra (2007)†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.25 Chapter 1 Introduction In this age of the Information Revolution, there are obvious advantages that can be reaped from the vast and ever growing Internet Community in the web: 24/7 connectivity; robust e-commerce that simplified business transactions and operations; erasure of geographical separation and distance; and access to a multitude of modern means of communications. Yet, as benefits derived from being part of the Internet community are many to mention, one resounding concern that pervades this virtual world is security. Most, if not all, entities participating and part of the Internet world are on their toes, keeping their eyes over their own virtual place in the Internet. It can be said that SECURITY is one big important word in the Internet today. As of this press time, there are many unscrupulous entities that crowd the Internet and are ready to attack anyone and any site that has vulnerability in its network security setup. Since many e-commerce companies and enterprises depend on the Internet for its survival, it is not a surprise that there is a creation and formulation of different way to protect one’s network. Over the past couple of decades, techniques to secure network through latest technology have gained an importance and have proven to be a necessity to any entity maintaining and securing a network. The need for security has spawned in the creation and design of firewalls, cryptography, authentication and most of all intrusion detection systems. Among these security tools, network intrusion detection system holds a potential as a tool against computer crime. An intrusion detection system can simply be called the process of monitoring and an alyzing the events (ie. the traffic of packets going in and out of the network stream) that occurs in a computer system to enable to detect signs of security problems. Yet, as a network security technology tool, intrusion detecti

Myth & Wrestling Essay Example | Topics and Well Written Essays - 2500 words

Myth & Wrestling - Essay Example 4The belief that fighting as many views wrestling is a preserve for men because again many belief women to be soft and not able to tolerate the physical exchange involved. 1.12. Overweight wresting Traditionally, overweight was not believed to be a major cause for worry in many traditions. 5In fact many are the cultures that associate body mass with being a well to do person and therefore lack of it was interpreted to mean starvation or 'not doing so well'. The underlying belief was that in order to gain weight, one had to be eating well and conversely, eating well meant that one was having enough to spend on food. Such society was simple and technological advancement had not caught up with the people, having enough food to put on the table implied that one was meeting their basic needs and therefore were well to do. Therefore overweight was something, which the society treasured and valued, and therefore those overweight or with much weight were considered fit for wrestling and the other culturally viable tasks associated with it. Today, the myth about wrestling still remains albeit with some little new meanings to it. 6The connotation attached to wrestling is one in which wrestlers are viewed as tough, by being tough or purporting to be tough the society sees in a wrestler a champion, someone who is dependable, one who can protect some one who can sire an offspring, capable of defense, toughness as depicted is a virtue. Wrestling is the epitome of power, authority and control. The above are achieved through cohesion, use of force, blackmailing and manipulation. Toughness is to be adored, to be revered and at the same time to be countered with an equal measure of... The author of the essay "Myth & Wrestling" begins with that myth is the hidden set of rules and conventions through which meanings, which are in reality specific to certain groups are made to seem universal and given for a whole society. Myth can serve to precipitate fear, to uphold status quo, to guide and serve as a road map towards cultural believes and practices. Wrestling, applied to myth can take the three different meaning so that several cultural values are attached to it. These may include masculinity as many cultures attach or connect masculinity to protectionism, the way wrestling is contacted makes clear that the society is agreeing to by spectating acts depicted in wrestling, whether fictional or real , in a wresting game, value of the masculinity the ingenuity with which wrestlers ruthlessly handle each other is a clear sign that, in wrestling there are deeper meanings. Just to emphasize masculinity, contesters are usually heavy and well build. Culturally a man underweight would never pass for wrestling auditions. It is almost un-ethic to even think about wrestling if one does not confer to the se values and standards. Myths for a long time has determined and chatted the way forward for man, this is evident in the way different meanings as embedded to different actions, tries and objects. Myths play and will continue to play a very positive role in the society. Currently the mystery in myth especially in wresting provides a better and deeper meaning which is essential to understand cultural meanings.

Reaction to Jack Kerouac's novel On the Road Essay

Reaction to Jack Kerouac's novel On the Road - Essay Example Al these activities were however meant to try and answer one constant question in their minds â€Å"how are we to live?† Beat is there a rather ambiguous word which can have several meanings. Kerouac’s critics however emphasis that the word beat means quite literally tired or beaten down. While Kerouac himself endorsed a rather positive meaning of the word, he put forward a meaning that was beatific and blissful. That is a generation that was always on the beat like in a musical rhythm such as jazz. Holmes and Kerouac published articles to try and enlighten on their interpretation of the word beat. They implied that rather than weariness the word implied being used and raw. This they explicated as coming from the core, of the human soul. It is therefore a word that depicted the vulnerability of the beat generation. He further depicted the meaning as being reduced to the bedrock of consciousness. In his articles he additionally enlightens that the beat generation was ver y different from the lost generation of the 1920’s. The beat, generation as enumerated by Kerouac in his many articles is a generation that is rather not lost but one that is constantly searching for answers to life questions. For the beat generation therefore there main concern is not why they should live but rather how they should live. The novel depicts a rather spiritual journey which also included some subjects that the beat generation struggled with. This included religion, marriage and friendship. In numerous ways it the journey the beat generation took in Kerouac’s novel is a quest towards understanding and to find conviction, significance and belonging. They also wanted a more than average feeling they therefore searched for a profound feeling and understanding. As described by Holmes, to be beat is being at the bottom of your personality looking up. This is a state where all things that lack importance have been stripped down and only the core remains to expe rience the different sensations. The beat generation of 1950’s and 60’s were correlated to behaviors that expressed estranged feeling from the conventional society and promoted individual freedom and clarity through intense sensory awareness brought about by altered consciousness. The beat poets including Lawrence Ferlinghetti and Gregory Curso attempted to write verses which were not constrained in the academic norms but rather of a â€Å"beat† quality. They sometimes mixed vernacular and profanities in their poems this was to depict the urgency and extent of the feeling in the poem movement. In the novel Kerouac depicts various other meanings of beat this are brought out by the characters he writes about. One instance is how Sal admires Dean’s transgressions and immorality even though his indecencies are sometimes extreme and very selfish to those around him. He embodies the beat generation by living for the moment and sampling different girls that come his way not caring if he destroys their lives. Sal in just the same pace idealizes the junkie body which also depicts some aspects of the meaning of the word beat. The word also has negative meanings as brought out to be nightmarish which is embodied by the homeless man idealized by Sal as Huck Finn. He ignores the poverty and marginalization but depicts the Hobo as being in Buddhist trance like mode. This is ridicule since the Hobo

Afshar tribe of Iran Essay Example | Topics and Well Written Essays - 2500 words

Afshar tribe of Iran - Essay Example The exact ethnic breakdown of Iran is unknown as there are no official numbers; however some international organizations have made estimates. The estimates are as following: Persians (65%), Azerbaijani (16Â  %), Kurds (7%), Lurs (6%), Arabs (2%), Baluchi (2%), Turkmens (1%), Turkic tribal groups such as the Qashqai (1%), and non-Iranian, non-Turkic groups such as Armenians, Assyrians, and Georgians (less than 1%). According to them Persian is spoken as a mother tongue by at least 65% of the population and as a second language by a large proportion of the remaining 35%. Afshars, also called Avshar are a branch of the Turkic Oghuz groups. These originally nomadic Oghuz tribes moved from Central Asia through Iran, Afghanistan, Syria, and finally most of them s ettled in Anatolia. Beginning from the 9th century, they started migrating towards west. Avshars are believed to have entered Anatolia after the Battle of Manzikert in 1071. They settled in various places in Anatolia. During the Mongol invasion in the following period, some Avshar tribes migrated to Syria and later formed what was called Halep Turkmens, which eventually migrated back to Anatolia and settled there. The Afshar tribes of Iran are two distinct Turkic-speaking ethnic groups. The larger group is concentrated in the north of the country, and the smaller in the south. Afshar or Afshari, is a Turkic language spoken in Turkey, Syria, parts of Afghanistan and Iran. It is considered by many to be a dialect of Turkish. Living in the northeastern Azarbaijan province, Shahsevans (renamed II Sevan after the victory of Islamic Revolution) were organized by Shah Abbas I in the 17th century as a militia from tribes of diverse origin. Mainly Turkish speaking, they were used to put down rebellions of other tribes. They were divided between Iranian Azarbaijan and the Russian or former Soviet Azarbaijan after the occupation of part of our country by the aggressive Russian

Managing and Leading change Essay Example | Topics and Well Written Essays - 2000 words

Managing and Leading change - Essay Example Changes in an organization may lead to development of new rules and methods of working. In order to implement change within an organization, managers may be required to impart training so that employees can easily adapt with the factors of the external environment. Managing change is highly systematic process and requires specific on behalf of the management and the employees (Jones, 2010). Business environment is highly fast paced and for long term survival it becomes necessary that organizations adhere to changes. Technology is one of the strongest aspects that have induced changes in the way organizations operate. Technological innovations have caused organizations to utilize resource in new and innovate ways (Pettigrew, Woodman and Cameron, 2001). Adapting to technological changes increases efficiency as well as provides scope for the management to operate in new ways. Organizations are also required to change when the requirements of customers change (Fernandez and Rainey, 2006). Evolution induces changes in the needs of consumers. Changes in consumer needs create demand for new products and services. Organizations are required to perceive such developments and change so as to be able to meet the newly created demand (Tsoukas and Chia, 2002). The current case study aims to understand the issues which Capitol Academy is faced with in respect of change management. In order to increase operational efficiency and earn more revenue, Capitol Academy had adopted certain changes. However, due to lack of planning and inadequate resource allocation, the company’s operations were turned upside down causing a number of management issues. The organization was also observed to concentrate more upon the development of its professional programs, ignoring other departments where change management was not implemented properly. The mismanagement has also