Music Forms That Defined the Baroque Era free essay sample

The end of the renaissance period brought several artists and intellects together to discuss the revival of the Greek drama. Although several forms from the renaissance were still used, the development of new styles evolved, especially In the area of vocal music. Opera, oratorio and the cantata came directly from the theatrical desire to Invoke the emotional awareness of their listeners through singing, while the concerto, sonata and suite gave the listener the ability to feel the conflict and harmony through instruments.Opera was made possible by the singing of poetic texts with a plot like function, achieving a distinctive advancement in the baroque musical scene. Its development was a step forward to the expanding music scene and gave a new view on the dramatic texts with musical enhancement. Opera is a drama that is sung with the accompaniment of instruments. Operas often have a long type speech that moves the plot along and expresses the characters feelings and emotions at specific points in the action. We will write a custom essay sample on Music Forms That Defined the Baroque Era or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page The first operas were often taken from Greek myth, recreating the drama and music of the ancient culture. Two sub-genres of opera were developed In the early 18th century: opera serial and opera buffo. Opera seen focused more on the object matter while opera buffo used duets, trios and larger ensembles and were notably lighter and often comedic tones. The word oratorio originally meant prayer hall, a building adjacent to the church. The musical genre of the oratorio emerged in the late 16th century and focused on the subject of religious texts.Oratorios, unlike operas, perform without costumes, scenery or action and are often divided into two distinctive parts. Popular composers of the oratorio are J. S. Bach, Antonio Vivaldi, and George Frederic Handel. The cantata, in early history confused with oratorio, consists of recitatives and set ices which Include arias, duets and choruses often In religious context. The cantata, Like the opera, contains scenery and movement but also has dialogue. By the end of the 17th century cantatas were often accompanied by orchestras.Popular composers of the cantata are J. S. Bach, Lug Rossi, and George Frederic Handel. The sonata, often used as chamber music, can consist of one, two or three instruments, usually violins, a treble instrument and a bass instrument. They usually contain four movements which alternate between fast and slow tempos. In the 18th century instruments such as the organ and harpsichord were rising in the solo mantas. Popular composers of the sonata are J. S. Bach, Alexandra Scarlatti, and George Frederic Handel. During the baroque era the concerto took on several forms. They could consist of a simple composition that Included voices, instruments or a combination of both, sacred works for voices and instruments, and Instrumental soloists or groups with an orchestra. Popular composers of the concerto are J. S. Bach, Antonio Vivaldi, and George Frederic Handel. Antonio Vivaldi, the most notable composer of the solo concerto, wrote approximately 350 concertos and standardized the three movement form, which consists of two fast and one slow movement. Nor for instruments. The suite is basically a two part series of dances in the same key and can consist of three to twelve movements.

Louis XIV And His Foreign Policy essays

Louis XIV And His Foreign Policy essays Louis XIV (1638-1715), was known as the 'Sun King'. By the time Louis took up the reign of the government in 1660, France had turned into the most powerful nation of Europe. At this time many of France's neighboring countries had been weakened both by revolts within their own countries and expensive wars with other lands. In Louis's mind, the natural boundaries of France were the Alps, the Pyrenees, and the river Rhine. His intentions were to push the frontiers of France out to these limits as well as win glory for himself. As a result Louis plunged France into 30 years of foreign wars trying to achieve his ambition. This paper discusses Louis' XIV's foreign policy and analyzes whether his foreign policy was successful or not. Louis XIV's notorious dictum was "I am the State". Even the late Charles De Gaulle often echoed this. Louis XIV (1638-1715) - king of France (1643-1715) - was known as the 'Sun King'. Louis, the third monarch of the Bourbon family, ruled for 72 years, the longest reign in European history. His rule typified the period of absolute monarchy in the second half of the 17th century, during which time kings ruled without the restraint of representative institutions. This epoch is widely known as the age of Louis XIV because other European monarchs imitated and competed with developments Coming to power at a young age, Louis did not have the conventional humanist education of most princes, who learned Latin, ancient history, rhetoric, and the arts. Instead his instruction focused on the practical necessities of kingship, such as the history of France and its monarchy and After Louis XIV came to the throne just before his fifth birthday, the Italian-born first minister Cardinal Mazarin guided the policies and effectively instructed Louis in affairs of state both internal as well as foreign affairs.. When Mazarin died in 1661, Louis proclaimed that he would ...

Culture Change Essay Example | Topics and Well Written Essays - 3500 words

Culture Change - Essay Example Once it becomes the learning organization, later different changes can be adopted by the administration and academic children easily. Empowerment is chosen for the faculty member as they can easily solve different issues with students and within the students. Moreover, they can decide accordingly that how they have to teach their students, what methodology they think would be better for academic careers of these students. For students in the business school, the school ahs decided to adopt socialization as more the students interact, the more they will learn from each other. The change in the culture or management of any organization not only includes cost rather it include consumption of time and other non-monetary cost. Before changing the culture and management in an organization we need to understand that how the culture within the organization is formed. The culture of the organization is formed when different people interact with each others and when their beliefs and values become matching with each other. Within an organization the faculty members and managers belongs to different cultures and backgrounds, but when they start working to achieve a single goal than their beliefs, values and mission become same and thus the start of a new culture within the organization start. ... The technological advancement and changes in the management strategies forces the top management to adopt a learning organization that keeps on changing with time. Learning organization requires decentralization, empowerment and cultural change. Providing a continuous change in the culture through learning process requires two main steps and these are 1. Single loop learning 2. This learning process involves identification of any problem and solving the problem in accordance with past policies and practices. 3. Double-loop learning 4. This learning process requires identification of different problems and solving them by adopting new changes in policies practices and standards. Process to develop a learning organization Different economists shows different process of theories evolved form the action research. But the action research process actually involves simply five steps in theory development and these are given as follows Diagnosis is the very first step in which the business school has to diagnose that where actually the problem is. They have to diagnose the problem within their departments. The change agent seeks the problem through different techniques either by interviewing the faculty members or seeking their reviews. The analysis is followed by the diagnosis process. In analysis section the business school has to analyze the root cause of the problem. The analysis process involves the involvement of faculty members that actually helps the change agent to seek the problem or changes in the departments. The feedback process includes information taken from the faculty members about above two processes. The feed back actually informs the

Liabilities and Remedies of Parties in a Contract Essay

Liabilities and Remedies of Parties in a Contract - Essay Example As the paper discusses  there are two contracts existing between the parties. The first contract is between Military Supply Ltd and the British Ministry of Defense while the second contract is between the Military Supply Ltd and Motor Parts plc. The contract between Military Supply Ltd and the British Ministry of Defense is for the purchase and delivery of 500 vehicles which will be used by the Ministry of Defense in its field operations. The second contract on the other hand is a contract of service between Military Supply Ltd and Motor Parts Ltd where the former hire the services of the latter to manufacture the 500 vehicles for the client of Military Supply Ltd which is the British Ministry of Defense. The relationships of the parties are defined and limited by the contracts that they entered into.From the report it is clear that the obligations of the parties in this case vary according to their participation in the transaction. In the case of British Ministry of Defense, its o bligation is towards Military Supply ltd. As buyer of the vehicles, the Ministry of Defense is obliged to deliver payments when the provisions and the objects specified under the contract are satisfied. On the part of Military Supply Ltd, its obligations are towards the Ministry of Defense as well as to Motor Parts. In the case of the Ministry, Military Supply Ltd is bound to deliver the 500 vehicles as per the specifications of the ministry in a timely manner.  

Starbucks Coffee Company - An Analysis Assignment

Starbucks Coffee Company - An Analysis - Assignment Example No Heading Page No 1 Retail Sales Mix by Products Type for Company –Operated Stores 3 2 Coffee & Snacks Shops – Industry at a Glance – 2011 4 3 Total Net Revenues of Starbucks 5 4 Ranking of Porter’s Five Forces 7 5 Outlet Numbers of Selected Specialty coffee stores 9 4 Number of Coffee Outlets - UK 10 6 Comparable Stores Sales Growth 15 1.0 Introduction: Starbuck is the leader in roaster, retailer and marketer of specialty coffee in the international level functioning in sixty nations around the world. Through company operated stores, Starbucks buy and roast first-rate coffee beans which it would market with handcrafted tea, coffee and other hot drinks, roasted beans, coffee accessories and a number of food items to its customers around the world. Starbuck main goal is that its coffee should be grown under the top standards of quality employing just buying practices. (Bussing-Burks: 1). Retail Sales Mix by Products Type for Company –Operated Stores : Starbucks established its first store on March 29, 1971 in Seattle. The major turning point in Starbucks operations started after Howard Schultz joined as director of Starbucks retail marketing and operations in 1982 as Starbucks started to offer coffee to espresso bars and fine restaurants. In 1984, Howard convinced the founders of Starbucks to apply the Italian coffeehouse concept in Seattle and in 1984, the ever first Starbucks Caffe Latte was offered. In 1987, Starbucks was acquired by II Giornale and the name was changed to Starbucks Corporation (Gilbert: 1). In 2000, Howard Schultz was promoted as chairman of the company. In 2008, Howard Schultz returned as the chief executive officer from the position of chairman and Coffee Equipment Company was acquired. In 2011, it acquired evolution fresh and in 2012, it acquired La Boulange. As of 30th September 2012, Starbucks has 9405 company –operated stores and 8661 licensed stores around the world. (â€Å"Starbucks Timeline 2012†). 1.1 â€Å"Segment Analysis â€Å" â€Å"Current Market Position† Coffee & Snacks Shops – Industry at a Glance – 2011 â€Å"USD in Billions† Revenue 26.5 Industry Annual Growth 2006 to 2011 2% â€Å"Annual Growth 2011 to 2016† 4.1% Industry Profit 1.6 Industry Wages 6.1 As per IBIS World Industry Report 2011 (Coffee & Snacks Shops), Starbuck is occupying 32.6% of share in the industry. (Fellner 2008:17). As per Starbucks annual report, Starbuck serves about 33% of total QSR (Quick Service Restaurant), which includes both convenience store coffee shop and coffee shop despite cutthroat competition in QSR, Starbuck is able to hold its share in the industry. Further in the global market, every one cup of coffee out of 100 cups of coffee served is being served by the Starbucks. 1.2 â€Å"Current Strategies† Recovering from recession, Starbucks has attained the highest annual income of $11.7 bn in the year 2011. During 2011, Blonde Roast, was introduced in its products, it entered into the juice segment by acquiring Evolution Fresh. Starbucks is now able to serve about 60 million

Gas sensors on zinc oxide nanostructures

Gas sensors on zinc oxide nanostructures Introduction Gas sensors based on semiconducting metal oxides are being widely used for sensing gases and vapors. The initial momentum was provided by the findings of Seiyama et al. in metal oxide-gas reaction effects in 1962. It was shown that the electrical conductivity of ZnO can be changed by the presence of reactive gases in the air. The merits of these sensors include their reliability, low cost and easy implementation. Nanostructures of metal oxides have been found to be most effective as gas-sensing materials at elevated temperatures. Very popular sensing materials are metal oxide semiconductors such as ZnO, SnO2, TiO2, and WO3. Generally the change of electric field (conductance, voltage, resistance or the change of piezoelectric effect) of the sensor is monitored as a function of the target gas concentration. Gas sensors normally operate in air, in the presence of humidity and interfering gases. A heated substrate membrane is fitted with gas sensitive nanostructured semiconductor material which generates electrical output signals once chemical reactions are initiated at their surface. A common property of all these detection reactions is that they require significant levels of thermal activation to proceed at a measurable rate. Nanostructures of semiconducting oxides are widely used for gas sensing due to their large surface area to volume ratio and possibility of complete depletion of carriers within nanostructures when exposed to gases. Nitrogen dioxide (NO2) is a reddish-brown, highly reactive gas that reacts in the air to form corrosive nitric acid as well as toxic organic nitrates. The major man made source of NO2 emissions is high-temperature fuel combustion in motor vehicles and industries. These emissions are primarily in the form of NO which gets oxidized in the atmosphere to NO2. The conversion rate depends on the ambient concentration of NO and O3. If O3 is present, the conversion is very rapid. Health and safety guidelines suggest that humans should not be exposed to 3ppm or more NO2 gas for periods longer than eight hours because of its toxicity. NO2 is a pulmonary irritant primarily affecting the upper respiratory system in human beings. Continued or frequent exposure to high levels of NO2 can cause inflammation of the lungs. Therefore, the development of a stable NO2 gas sensor that can detect extremely low concentrations of NO2 with high sensitivity and selectivity is highly desirable. Such a sensor can be used for environmental monitoring. It can also be used in an early warning system that detects the presence of NO2 before the critical concentration of NO2 is reached. In our work, we will develop a sensor for NO2 gas sensing based on our understanding in sensor mechanism and synthesis of ZnO nanorods, using simple hydrothermal methods. The various performance parameters of the sensor, namely gas selectivity, sensitivity, response and recovery time will be studied. The gas sensor test-bench developed in COEN (Centre of Excellence in Nanotechnology), AIT, will be employed for characterizing the sensor performance. Chapter 2 Literature review This chapter is focused on the literature review of metal oxide based semiconducting nanostructures used for gas sensing. The working principle of metal oxide gas sensors, measurement methods and synthesis mechanisms is included in this review. Metal oxide nanostructures Metal oxides such as SnO2, WO3, TiO2 and ZnO possess high sensitivity to changes in their surrounding atmosphere at elevated temperatures. The sensing properties of metal oxides in form of thick or thin films have been studied to improve, by the addition of noble metals namely Pd, Pt, Au, Ag in terms of selectivity and stability. In 1991, Yamazoe showed that reduction of crystallite size caused a huge improvement in sensor performance. In a low grain size metal oxide almost all the carriers are trapped in surface states and only a few thermal activated carriers are available for conduction. From the point of view of device fabrication, first generation gas sensor devices were fabricated by thick film technology. Then the material fabrication processes improved towards the thin film technology. The fabrication process for thin film technology namely physical and chemical vapour deposition was highly automated and offers high reproducibility. The electrical properties of both thin and thick film sensors drift due to the grain porosity modification and grain boundary alteration. Several methods like addition of noble metals as catalysts or mixed oxides were put forward to improve the sensing performance of the gas sensors. The structural engineering of metal oxide nanostructured thin films proved to optimize the performance of these types of gas sensors. The various operating parameters such as response time, output signal, selectivity and stability can be improved and tuned through the optimization of the structure. Using structural engineering method, the various geometric parameters of metal oxide gas sensing matrix like grain size, agglomeration, film thickness, porosity can be controlled. The next forward step in gas sensing was achieved by the successful preparation of stable single crystal quasi-one-dimensional semiconducting oxides (nanorods, nanowires) leading to the third generation of metal oxide gas sensors. Working principle of metal oxide gas sensors Conductometric metal oxide gas sensors depend on changes of electrical conductivity due to the interaction with the surrounding atmosphere. The normal operating temperature of metal oxide gas sensors is within the range between 200  °C and 500  °C. The operating temperature should be high enough so that gas reactions occur in a time on the order of the desired response time and should also be low enough to avoid any variations in the bulk of the sensing matrix. The single crystal structure synthesized at temperatures higher than the operating temperature of the sensor shows high stability. Based on the study of a large range of oxides, the phenomenon of change in conductivity to the presence of reactive gases in air is common to oxides and not specific to a few special cases. If the conductivity is too high, then an effect is not expected and similarly if the conductivity is too low, then an effect will be difficult to measure. In practical applications, if an oxide sample has a resistivity between 104 and 108 Ocm at 300- 400  °C, then it will function as a gas sensor when heated to a temperature in this range. The sign of response (resistance increase or decrease) leads to a simple classification: gases can be classified as oxidizing or reducing and oxides can also be classified as p or n type. P-type oxides show a resistance increase in the presence of traces of reducing gases and resistance decrease to oxidizing gases. n-type oxides show opposite behaviour. This behaviour also correlates with the effect of changing oxygen partial pressure (PO2). Adsorption on surfaces The sensing mechanism in metal oxide gas sensors is related to ionosorption of species over their surfaces. The most important ionosorbed species when operating in ambient air are oxygen, water, carbon and its compounds. High concentrations of carbon can block surface sites of adsorption on a metal oxide. In the temperature range between 100  °C and 500  °C, oxygen ionosorbs over metal oxide in molecular (O2-) or atomic form (O-). Hence the study of adsorption is of fundamental importance in the field of sensors. Physisorption In this weakest form of adsorption like van der waals forces, no true chemical bond between the surface and adsorbate (or reaction species) is established. This bonding is mainly due to the induced dipole moment of a nonpolar adsorbate interacting with its own image charges on the polarized surface. The bonding energy is rather weak in the order of 0.1 eV. Chemisorption Chemisorption corresponds to the creation of chemical bonds between the adsorbate and surface and results in the electronic structure perturbation. In gas sensors, the target gas may be chemisorbed or physisorbed on the surface. When the gas species adsorb on the surface, molecules are either dissociated or diffused in the sensitive layer. Based on the Temperature Programmed Desorption (TPD) and Electron Paramagnetic study (EPR) studies, at lower operating temperatures, oxygen is considered to be adsorbed in molecular form (either as neutral O2 (ads) or charged O2(ads) 2- ) due to its lower activation energy. At higher temperatures it dissociates into atomic oxygen (either neutral O(ads) or singly ionized (charged) O(ads)- or doubly ionized O2(ads)- ). Finally at very high temperatures the loss of lattice oxygen (first surface and then bulk) takes place. When a reducing gas like CO comes into contact with the surface. These consume ionosorbed oxygen and in turn change the electrical conductance of metal oxide. The overall effect is a change of the density of ionosorbed oxygen that is detected as an increase of sensor conductance. Direct adsorption is also possible for the gaseous species like strongly electronegative NO2, which decreases the sensor conductance. NO2 absorption on tin oxide surfaces was studied by temperature programmed desorption measurements and found that the adsorbates originating from NO2 are the same as those from NO, as NO2 molecule dissociates easily over the tin oxide surface. These adsorbates can be divided into three types, two nitrosil types (Sn NO+ and Sn NO- ) and the nitrite type Sn O-N=O. The nitrite type does not play any role in gas sensing since it is not involved in any electron exchange with the bulk of the semiconductor. In practical applications, gas sensors are normally expected to operate in air, in the presence of humidity and interfering gases. In such cases, for operating temperatures in a range of 100 to 500  °C, at the surface of the sensitive material various oxygen, water and carbon dioxide related species are present. Some gas species form bonds by exchanging electrical charge with specific surface sites and others may form dipoles. Dipoles do not affect the concentration of free charge carriers and so they have no impact on the resistance of sensitive layer. Fig.1 explains the simplified case of adsorbed oxygen ions and hydroxyl groups bound to an n-type metal oxide semiconductor. These adsorbed ions cause a band bending while the dipoles change the electron affinity when compared to the state before the adsorption .The changes of the work function (?F) are determined by band bending (qVs due to ionosorption) and changes in the electron affinity () due to building of dipoles at the sur face (M d+ OH d-). Ec, Ec,s Energy level representing the bottom of the conduction band and at the surface respectively. Ev, Ev,s Energy level representing the top of the valence band and at the surface respectively. Evac vaccum level, EF Fermi level, ÃŽ ¦ Work function, χ Electron affinity. Sensor Characteristics The characteristic of a sensor is classified into static and dynamic. Static characteristics can be measured when all the transient effects of the output signal have stabilized in to steady state. Dynamic characteristics tend to describe the sensors transient behavior. Static characteristics Sensitivity Sensitivity is the ratio of incremental change in the output of the sensor to its incremental change of the measurand in input. For example, if we have a gas sensor whose output voltage increases by 1 V when the oxygen concentration increases by 1000 ppm, then the sensitivity would be 1 mV/ppm. Generally, the sensitivity to the target gas is defined as the percent reduction of sensor resistance. Sensitivity (%) = [(Ra- Rg) / Ra] Ãâ€"100, where Ra is the value of initial equilibrium resistance in air and Rg is resistance in the presence of a target gas. For convenience sometimes the sensitivity of gas sensor is expressed as the ratio of resistance in air over resistance in gas for reducing gases (Ra/Rg) and resistance in gas over resistance in air (Rg/Ra) for oxidizing gas. Selectivity The sensors ability to measure a single component in the presence of others is known as its selectivity. For example, an oxygen sensor that does not show a response to other gases such as CO, CO2 is considered to be selective. Selectivity = (sensitivity of gas1/sensitivity of gas2) Selectivity of the sensor is assessed by the ratio of sensitivity between the gases that is of interest to be detected over the gases that are uninteresting for detection in equivalent concentrations. To improve selectivity to specific gases, sensor array technology is also being adapted. Stability and Drift The sensors ability to produce the same output value when measuring a fixed input over a period of time is termed as stability. Drift is the gradual change in the sensors response characteristics while the input concentration of the gas remains constant. Drift is the undesired and unexpected change that is unrelated to the input. It may be attributed to aging, temperature instability, contamination, material degradation, etc. For instance, in a gas sensor, gradual change of temperature may change the baseline stability, or gradual diffusion of the electrodes metal into substrate may change the conductivity of a semiconductor gas sensor. Repeatability It denotes the sensors ability to produce the same response for successive measurements of the same input, when all operating and environmental conditions remain constant. Reproducibility The sensors ability to reproduce responses after some measurement condition has been changed. For example, after shutting down a sensing system and subsequently restarting it, a reproducible sensor will show the same response to the same measurand concentration as it did prior to being shut down. Hysteresis It is the difference between output readings for the same measurand, when approached while increasing from the minimum value and the other while decreasing from the peak value. Response Time The time taken by a sensor to arrive at a stable value is the response time. It is generally expressed as the time at which the output reaches a certain percentage (for instance 95%) of its final value, in response to a stepped change of the input. At the onset, the response time is very fast, followed by a long drawn tail before reaching steady state value, thus the response time are often expressed as 50% or 70% of the final time. Recovery time is defined as the time that the sensor takes to recover its resistance from exposed condition to the baseline value after target gas is cut out from the environment Dynamic Range or Span The range of input signals that will result in a meaningful output for the sensor is the dynamic range or span. All sensors are designed to perform over a specified range. Signals outside of this range may cause unacceptably large inaccuracies, and may even result in irreversible damage to the sensor. Dynamic characteristics The dynamic characteristics of a sensor represent the time response of the sensor system. The various important dynamic characteristics of sensors are discussed below, Rise time Rise time is defined as the time required by the sensor response to change from 10% to 90% of it final steady state value. Settling time It is the time taken by the sensor response to settle down to within a certain percentage of the steady state value. Influence of contact electrodes on sensor performance The contact electrodes used in gas sensors can have both electrical and electrochemical roles. For thin compact films, contact resistance plays an important role as dominant factor in overall resistance. The contribution of contact resistance is also extremely important for the case in which individual nanorods, nanowires or nanobelts are used as sensing layers. These electrodes are generally made of metals. They can also be fabricated from materials such as conductive polymers or conductive metal oxides. Although the concept of resistance change of the sensitive material when exposed to target gas is widely known, the overall resistance of the sensor depends not only on the gas sensing material properties but also on parameters such as transducer morphology, electrode etc. When the sensitive layer consists only of a compact continuous material and the thickness is larger than the Debye length, it can only partly depleted when exposed to target gas. In this case, the interaction does not influence the entire bulk of the material. Two levels of resistance are established in parallel and this fact limits the sensitivity. Thin layer will be the better choice which can be fully depleted. The representation shows the influence of electrode-sensing layer contacts. Rc is resistance of the electrode-metal oxide contact, R11 is the resistance of the depleted region of the compact layer, R1 is the equivalent of series resistance of R11 and Rc, and the equivalent series resistance of SRgi and Rc, in the porous and compact situations, respectively. Rgi is the average inter-grain resistance in the case of porous layer, Eb minimum of the conduction band in the bulk, qVs band bending associated with surface phenomena on the layer, and qVc also contains the band bending induced at the electrode-metal oxide contact. Improvement of selectivity by surface modifications Mixing metal oxides with Metals that function as catalysts Binary compounds and multi-component materials Doping are the most common methods used to enhance the gas sensing performance of metal oxide gas sensors. These additives can be used for modifying the catalytic activity of the base oxide, favoring formation of active phases and improving the electron exchange rate. The interaction of gas with the sensing material, resulting in the gas sensitivity, is determined by the chemical properties of the sensor surface. Different surface atoms can be introduced on the surface of the metal oxide sensors. This surface modification leads to new chemical reactivity and enables the sensor to be operated at low temperatures. Nanoscale particles of noble metals (Pd, Pt, Au and Rh) and oxides of other elements (Co, Cu and Fe) deposited on the surface of metal oxides can act as surface sites for adsorbates and promoters for surface catalysis. They create additional adsorption sites and surface electronic states and as a result gas sensitivity, selectivity, rate of response can be altered. For achieving high gas response, the noble metal should create optimal conditions for both electron and ion (spillover) exchange between surface and reacting gas species. The nature of noble metals, their oxidation state and their distribution on the surface are determining factors in gas sensor sensitivity and selectivity. To attain the homogenous distribution of noble metal on the surface is very difficult. Surface morphology has a significant effect on the shape and distribution of catalysts. Noble metal clusters have a tendency to accumulate at step edges and kinks of metal oxides during their deposition. Catalysts based on noble metals can be poisoned by many organic and inorganic chemicals that contain sulphur (H2S, SO2, thiols) and phophorus. The excessive thickness of catalytic active additives can change their functions, turning into either shunting layer or active membrane filters, obstructing the penetration of detecting gas in the surface of gas sensing matrix. At certain conditions this quality can also be used for an improvement of gas sensors selectivity. It has been studied that the incorporation of additional phases (different oxides) in nanocrystalline systems in small quantities can change the conditions of base oxide growth. SnO2 doped with Nb (0.1 4 mol%) causes a decrease in crystallite size from 220 nm for pure SnO2 to about 30 nm for Nb (0.1 mol%) doped samples. The additional influence observed due to doping is the change in film resistance. SnO2 doping by Nb and Sb in the range of 0.01 and 1.0 mol% during sol-gel preparation and annealed at 900  °C leads to film resistance decrease of 100 to 1000 times respectively, while doping with In resulted in a rise in film resistance by a factor of 100. The effect of doping on gas sensing properties of metal oxide gas sensors is different from the catalytic activity of these additives. Improvement of selectivity by operating conditions The sensor material may be operated at a comparably wide range of operating temperatures (300 900  °C) leading to different thermal energies for the surface reactions, differences may be attained by selecting the operating temperature, leading to a variation in gas sensitivity. A more improved version of this idea is to continuously increase or decrease the operating temperature of a given sensor and to continuously measure the variation of conductivity. This technique is known as temperature transient operation which gives more information in case of gas mixtures. To realize selective gas detection, sensor arrays are also constructed where several sensors showing different patterns of gas sensitivity are selected and simultaneously operated. A simple technique to obtain an array using one sensor is to modulate the operating temperature to different levels. Excessive increase of operating temperature may lead to a considerable drop of gas sensitivity. Moreover increasing working t emperature can create conditions, where gas response will then be determined by change of bulk properties of material. Improvement of response and recovery time of gas sensors A high speed gas switching system can be used to improve the response of the gas sensor. Yamazoe et al. studied the response and recovery properties of SnO2 porous film gas sensors using a high speed gas switching system. The developed system allows the rapid replacement of the gas atmosphere in the chamber between air and H2 (or CO). It was reported that the response speed of the sensor was fast, reaching a response time of less than 0.5s at 350  °C. The rates of diffusion and surface reactions of these gases (H2 and CO) in the porous sensing film are high enough for the sensor to reach a steady state within a short time. However the resistance in air did not reach the original value by repeated switching. This incomplete recovery was attributed to the slow desorption of H2O and CO2 formed on SnO2 by the surface reaction of H2 and CO respectively. Synthesis of 1-D metal oxide nanostructures Metal oxide nanostructures synthesis methods are broadly categorized as Solution phase synthesis method, where the growth process is carried out in liquid. Since aqueous solutions are used, this process is otherwise termed as hydrothermal growth process. Gas phase synthesis method uses gaseous environment in closed chambers. The synthesis is carried out at high temperatures from 500  °C to 1500  °C. Zinc oxide (ZnO) ZnO is wide bandgap (Eg = 3.4 eV) II VI compound semiconductor which has a non-centrosymmetric wurtzite structure with polar surfaces and lattice parameters a = 0.3296 and c = 0.52065 nm. The structure of ZnO can be described as a number of alternating planes composed of tetrahedrally coordinated O2- and Zn2+ ions, stacked alternatively along the c-axis. The tetrahedral coordination in ZnO results in piezoelectric and pyroelectric properties. The oppositely charged ions produce positively charged (0001)-Zn and negatively charged (000-1)-O polar surfaces, resulting in a normal dipole moment and spontaneous polarization along the c-axis. Hydrothermal Synthesis of Zinc oxide nanostructures Different techniques namely sol-gel, spray pyrolysis, hydrothermal method, electrospinning and thermal evaporation are prevalent for the synthesis of zinc oxide nanoparticles and nanorods. The hydrothermal process is an environmentally friendly process and does not require a complex vacuum environment. The hydrothermal process is surface independent and provides good control over the morphology of the nanostructures. ZnO nanorods growth on glass substrates by thermal decomposition of hexamethylenetetramine (HMT) and zinc nitrate is reported by Baruah et al. Thermal degradation of HMT releases hydroxyl ions which react with Zn2+ ions from ZnO. The role of HMT is to supply the hydroxyl ions to drive the precipitation reaction. Sugunan et al, have proposed that HMT being a long chain polymer and a nonpolar chelating agent, gets preferentially attached to the non polar facets of the zincitie crystal thereby cutting off the access of Zn2+ ions to them leaving only the polar (001) face for epitaxial growth. Metal oxide nanostructure based conductometric gas sensors Zinc oxide Characterization of gas sensing properties of ZnO nanowires is reported by Ahn et.al. ZnO nanowires were fabricated by a selective growth method on patterned Au catalysts forming a nanobridge between two Pt pillar electrodes. The gas sensing properties were demonstrated using NO2 gas. The response as a function of temperature is shown to be highest at 225  °C and linearly increased with the concentration of NO2 in the range of 0.5 3ppm and saturated beyond this range. The sensor performance is also compared with ZnO nanocrystals, Sn and In doped ZnO thin film. Also the nanobridge structure is shown to have fast recovery behaviour because the desorbed gas molecules can be easily removed off from the nanowires surfaces. Lupan et.al demonstrated the gas sensing behaviour of Al doped ZnO films synthesized by successive chemical deposition method. Successive chemical solution deposition method was reported to be simple and requires non-sophisticated equipment to produce nanostructures with high efficiency. Nanostructured ZnO films doped with Al showed a high sensitivity to CO2 than undoped ZnO films. Characterization and gas sensing properties of ZnO hollow spheres is reported by Zhang et.al. Different concentrations of NH3 and NO2 at different temperatures were used to test the gas sensor. ZnO hollow sphere sensor exhibited extremely different sensing behaviors to NH3 and NO2. The optimum operating temperature of the sensor was 200  °C for NH3 and 240  °C for NO2 respectively. The gas sensor exhibited much higher response to NO2 than to other gases at 240  °C implying good selectivity and potential application of the sensor for detecting NO2. Tin oxide Law et.al, analyzed room temperature sensing properties of a single crystalline tin oxide nanowire sensor towards nitrogen dioxide. NO2 chemisorb strongly on SnO2 surface and at room temperature desorption is not complete when the NO2 is removed. UV light was used to activate both the adsorption and desorption process. In the dark, oxygen adsorbs on the surface capturing electrons from the semiconductor and creates a depletion layer. When exposed to UV, photo-generated holes migrate to the surface and recombine with electrons releasing oxygen ions, with an increase in conductance. The detection limit was 2 10 ppm of nitrogen dioxide. Kolmakov et.al studied the effect of catalysis in tin oxide single wire FET structures. The sensing capabilities of SnO2 single nano-wires and nanobelts in a FET configuration before and after functionalization with Pd catalyst was analysed. The improvement in the sensing performance after catalysation was reported to be the combined effect of spill-over of atomic oxygen formed catalytically on Pd clusters and migrating on SnO2 surface and also to the back spill-over effect in which weakly bound molecular oxygen migrates to Pd clusters and are catalytically dissociated. Indium oxide Indium oxide nanowires have been tested towards ethanol by Xiangfeng et.al. A mixture of In2O3 nanowire and polyvinyl alcohol solution was coated on alumina tubes with two gold contacts at the end; a heating wire was inserted in the tube to operate in the temperature range 100 500 °C. The resistance of the nanowires was monitored in presence of air, ethanol and other gases. The highest response was obtained with ethanol, the detection limit was estimated to be equal to 100 ppm. Molybdenum oxide Molybdenum oxide nanorods based gas sensing was reported. The MoO3 nanorods were characterized by high response to ethanol and CO at temperatures in the range of 100  °C. The response of thin films with the same structure was comparatively studied and nanorods based sensor resulted in one order of magnitude more sensitive due to the high surface to volume ratio and reduced lateral dimensions of the nanorods. Other metal oxides Sawicka et.al. presented the nitrogen sensing properties of tungsten oxide nanowires prepared with electrospinning. The effect of processing parameter variations was studied and a comparison with thin films prepared by sol-gel was also presented. WO3 nanowires showed better NO2 sensing performances compared to sol-gel processed films due to increase in surface area of nanowires. A large amount of literature is available on the gas sensing properties of carbon nanotubes. Only little attention is put in the studies of gas sensing properties of metal oxide based tubular structures. Varghese et.al. studied the hydrogen sensing properties of titania nano-tubes. The tests were performed in nitrogen atmosphere and 1% H2. The response time increased with temperature and the response time was 2-3 min. NO2 gas sensors based on ZnO nanostructures Liu et.al reported the NO2 gas sensing properties of vertically aligned ZnO nanorod arrays prepared by hydrothermal method with zinc acetate and hexamethylenetetramine. The seed layer was deposited by ultrasonic spary pyrolysis. The aqueous hydrothermal solution was prepared by mixing equimolar ratio of zinc acetate dehydrate and HMT. The hydrothermal growth was carried out in a Teflon-lined stainless container. The substrate was put in the solution with the seeded face down and the container was sealed and kept at 110 °C for three hours. The nanorod sensor shows a higher sensitivity than the ZnO film based sensor prepared by ultrasonic spray pyrolysis. The enhanced sensitivity is attributed to the higher aspect ratio of the nanorod structure and the sensitivity increases with the length of the nanorod. The relative response of the sensor is linearly proportional to NO2 concentration in the 0.2 5 ppm range. The NO2 gas sensing properties of semiconducting type gas sensors with channels composed of non-agglomerated, necked ZnO nanoparticles were investigated by Jun et.al. The heat treatment of the nanoparticles at 400 °C led to their necking and coarsening. The slight necking of the nanoparticles with their neighbors also enhanced the conductivity of the channels, due to the lowering of the potential barrier. The response of the necked nanoparticle based sensor was reported to be as high as 100 when exposed to 0.2 ppm of NO2 at 200  °C. NO2 gas sensor based on ZnO nanorods grown by ultrasonic irradiation was reported to very high sensitivity with a very low detection limit of 10 ppb at 250 °C. Sonochemical route was employed for the fabrication of vertically aligned nanorods on a Pt electrode patterned alumina substrate. The total time requir

Intelligence Customers :: essays research papers

INTELLIGENCE CUSTOMERS The collapse of the Soviet Union has finally brought the cold war to a conclusion in the 1980’s. This collapse brought about a transfer in the global power structure. Threats such as terrorism, nuclear proliferation, narcotics trafficking and organized crime e became more prominent. The United States’ national security policies were revolutionized to be successful against the new risks towards the Nation. It may be assumed that the best group to handle the new pressures of the world would be the U.S. Intelligence Community, but the unique threats do not harbor the traditional roles that were designed for the U.S. Intelligence Community. Biological hazards such as Anthrax and Small pox, which are both remarkable threats to global and national security, have been collected, analyzed and dealt with by civilian government agencies and academic circles. The Intelligence Community should only use its technology to collect non-traditional intelligence that may infringe on only national and global security issues. There are hundreds of intelligence customers, but there are 14 primaries that come together for national security purposes.   Ã‚  Ã‚  Ã‚  Ã‚  To gain a better understanding of intelligence, the term must be defined. Intelligence is when data is collected, organized and becomes useful information. The information is then analyzed and becomes intelligence. The U.S. Intelligence Community supports the President of the United States, the cabinet, Congress, and down to the tactical level of deployed military forces. Each customer is equally as important as the other. The members of the Intelligence Community, also known as intelligence customers are comprised of 14 members: The Defense Intelligence Agency is a major producer and manager of foreign military intelligence. They provide military intelligence to warfighters, defense policymakers and force planners, the Department of Defense and the Intelligence Community in order to support U.S. military planning, operations, and weapon systems acquisition. The National Security Agency is the Nation's cryptologic organization. They coordinate, direct, and perform highly specialized activities to protect U.S. information systems and produce foreign intelligence information. The NSA is one of the most important centers of foreign language analysis and research within the Government. The Federal Bureau of Investigation is the principal investigative arm of the United States Department of Justice. The FBI is to uphold the law through the investigation of violations of federal criminal law; to protect the United States from foreign intelligence and terrorist activities; to provide leadership and law enforcement assistance to federal, state, local, and international agencies; and to perform these responsibilities in a manner that is responsive to the needs of the public and is faithful to the Constitution of the United States.

A Savage Journey

Numerous pursuits in obtaining dreams had been evident in the perceptions of many individuals.   How an individual carries himself in the realm of reality is actually dependent on how one tries to comprehend and internalize the explanations on why things consequently fall into place.As for Hunter Thompson, America has wickedly divulged on the rather comical state of rationality and thus is considerably out of track with regard to the rather important matters in life.   Its innovative response to technology and corruption is swallowing up the credit of the living masses and is thus benefited by the predator of the country.Thompson’s means of establishing what seemed to be true in his immediate time showed that the country was indeed facing a critical state of confusion over ‘reality’ and ‘idealism’.Undeniably, the impact of confusion towards a certain group of people or set of community may mean much on the development and the level of thinking of many.   How individuals are actually correlated in a broader sense, is the main reason why one action, either directly or indirectly, involves another whether it is in the negative or the positive state.AnalysisThompson’s book took pleasure upon unfolding the secrets of the past and the horrifying truths of the vortex of Las Vegas, or America at that.In the most extreme sense, I could easily distinguish the initial intent of the author in producing such masterpiece in the â€Å"dope world† which as a matte of fact, transcribed during the 60’s (Thompson), and if it may not be that harsh to take into assumption, inherited by today’s contemporary dopers, at that.One of the striking perceptions which I have noted on the novel, as established in Thompson’s plot, is the harshness of the society on the concept of ‘illegal’ entities.   Perhaps it is righteous enough to implement certain laws and reputation with regard to the matter, but th en again, the equilibrium of the imposition seems to boggle my sanity in that certain perspective.Thus, I realized that the callous form of justice had been crucially bias, taking for certain to a fact that even those who were held responsible for the eradication of what they introduced as ‘illegal’ were actually the catalysts of the inequity.   It takes to raise a brow in my rationality in the prudent side.The novel itself, taken with opinion based justification, is considerably a breakthrough to the society and to those who are well concerned over the matter.Perhaps ‘drugs’ is an evil commodity, but how Thompson was able to deliver his stands with the use of wickedly comical idioms and metaphors struck my amazement that his view on the society was amorously correlated and incorporated as rather the ‘evil’ one and ‘drugs’ as the hero of mankind (Thompson).   How’s that for the paradox of the universe?

Essay about The Early Life of Machiavelli

Essay about The Early Life of Machiavelli Essay about The Early Life of Machiavelli Slide 2: The early life of Machiavelli Machiavelli was born on May 3rd 1469 in Florence, Italy, the first son and third child of attorney Bernardo di Niccolà ² Machiavelli and his wife Bartolomea di Stefano Nelli. He was born to an established though not affluent middle-class family whose members had traditionally filled positions in local government. Machiavelli was born in a tumultuous era- popes waged acquisitive wars against Italian city-states, and people and cities might fall from power at any time. Married Marietta Corsini, 1501; children: five. Slide 3: About his life He was born as aristocrat†¦.This is a member of a aristocracy government. His father was an aristocrat. The most powerful class in Greek history While little of the author's early life has been documented, it is known that as a boy he learned Latin and that he quickly became an assiduous reader of the ancient classics. His main political experience in his youth was watching Savanarola from afar. Soon after Savanarola was executed, Machiavelli entered the Florentine government as a secretary. His position quickly rose, however, and was soon engaging in diplomatic missions. He met many of the important politicians of the day, such as the Pope and the King of France, but none had more impact on him than a prince of the Papal States, Cesare Borgia. Unfortunately, for Machiavelli, he was dismissed from office when the Medici came to rule Florence and the Republic was overthrown. The lack of a job forced him to switch to writing about politics instead of being active. His diplomatic missions were his last official government positions. Slide 4: Fields of work During the renaissance, he was an Italian diplomat, political philosopher, musician, poet, and playwright. He was a founder of modern political science, and more specifically political ethics. Machiavelli is regarded by some as the founder of value-free political science. He describes politics as it is, not as it might be, and shows how this knowledge can be exploited to bring greater order into human affairs. But Machiavelli's science is anything but value-free: He prefers glory to security, and admires innovators more than conservatives. Though he writes both for republics and tyrants, many have argued that he favors one over the other. In fact, he clearly has a preference for republics, but believes that the founding father of every republic needs to possess unrestrained power. Machiavelli engaged in a flurry of diplomatic activity on behalf of Florence, travelling to the major centers of Italy as well as to the royal court of France and to the imperial curia of Maximilian. We have letters, dispatches, and occasional writings that testify to his political assignments as well as to his acute talent for the analysis of personalities and institutions. During his lifetime, Machiavelli was best known as a playwright, and the Mandragola is his most original play. In this comedy Machiavelli applies his views to ordinary, seemingly nonpolitical life: Callimaco, a young man, is attracted to young Lucrezia, who is unfortunately married to Nicia, an older man. Thus Callimaco agrees to a plan devised by the Machiavellian figure Ligurio to gain access to Lucrezia. As this is a work of fiction, and not a long one to read, I will not reveal the whole plot here so as not to spoil anyone’s fun. The Mandragola is regarded as a classic of Italian literature, illustrating Machiavelli’s versatility as an author. It touches on many of the themes common to his political works: people’s ambition to get what they want, the gray areas in moral life, criticism of the church and so forth. But here his irreverent attitude is more visible than in his more â€Å"serious† works. Slide 5: Impacts Scholars have argued that Machiavelli was a major indirect and direct influence upon the political thinking of the Founding Fathers of the United States. Benjamin Franklin, James Madison and Thomas Jefferson followed

Femme Noir as the Queen of the Night Fantastical Transformations of a Woman

Femme Noir as the Queen of the Night Fantastical Transformations of a Woman Women played a crucial role in art and fashion in different periods of time. Some females were muses for artists and poets while others tried to break the rules established in society and introduce their own perspective of the world through their works of art. As such, it is necessary to see how women can contribute to the innovations and development of both art and fashion.Advertising We will write a custom article sample on Femme Noir as the Queen of the Night: Fantastical Transformations of a Woman specifically for you for only $16.05 $11/page Learn More A new creative project called ‘Art Meets Fashion’ is aimed at showing the benefit of using such exhibitions for educational and informational purposes. Experience gained by the participants of the project is sure to change their perception of the art and design as well as fashion in whole. The project consists of several teams each including an artist, a fashion designer, a representative of school, and a documenter. So, the team Femme Noir consists of an artist Duke Windsor, a fashion designer Osbaldo Ahumada, a documenter Susan Lazear, and a school representative Andrea Marx from SD Mesa College. The project Femme Noir was inspired with the image and the entire mood created by the Queen of the Night and her aria in The Magic Flute by Mozart. Fantastic and close-to-life elements can be found in the sculptures being a golden middle of the fashion and art meeting. Femme Noir is the name of the team that emerged from the image of a woman who knows how to survive in the world of the dark middle ages. So, the team members managed to apply the historic perspective and mood of the aria to the sculpture and painting in a fashionable manner using extravagant colors and irregular shapes. The exhibition of this team’s project will take place in Dolcetti Boutique to encourage the audience to join the world of fashion through art and vice versa. People that are interested in collaboration between representatives of different fields and development of technologies and useful ideas can find something new in this project as it is aimed at showing the transformation undergone by a queen from Mozart’s aria to fashionable issues created by the Femme Noir team. Art Meets Fashion. Art Meets Fashion, 2009. Web.

Module 5 Essay Example | Topics and Well Written Essays - 1250 words

Module 5 - Essay Example The number of visits made have a mean of 2.86 with a variance of 4.87. The standard deviation is 2.21 confirming the spread of the data. Group A has wide variations in terms of among the group observations. As Richmond, R (2006) puts it, the amount of variations in a group determine how the elements of the group are spread and how the differences amount to. The workers in group A are quite different from each other and it will not be a good idea to hire them due to this. Both groups have the same mean of 79.1 but the workers in group B have almost the same traits than in group A. When it comes to getting the services of a certain group, Group B is most likely due to its homogeneity. Group A has a standard deviation high above the expected of 24.12. In business, the mean is the best measure of central tendency. For example when you are reporting the sales you made in a day, the mean in the figure to use sine it shows what you have done in overall. On the other hand, while dealing in shares, the median is the most important as it shows the price which is the expectation of many. It shows where many people would like or got their shares in. In exports, the mode is the most important since it determines the frequency of doing business as well as the expected profit. Mode is also applicable when one is dealing with prediction of future business

The World is Spiky by Richard Florida Assignment

The World is Spiky by Richard Florida - Assignment Example They are spreading all over the globe and those countries that are able to access these advances are putting their mark on this globe. This is a phenomenon synonymous with modern world. He also asserts that education plays an important role in further flattening the ground and there is need to set the bar high for leaders as other players re overtaking. Evidently, the assertions put by Thomas are true. They are based on the current observation. However, there are details left out such as the progress of the technological leaders during the time others were catching up. Robert Florida puts forth that people with talent are being attracted to areas which are renowned for technological progress and output. The potential of the areas to attract talent from other parts is high because there is a concentration of financiers and appropriate education. This attraction has led to development of top areas or â€Å"spikes†. The areas where these talents are pulled from are low in progres s and productiveness.   The flattening effect notion arises because these areas are dispersing. Therefore, there is no denying that there are hills and valleys in the economy only that the distance between respective hills and valleys is being shortened by dispersion. The peaks are concentrated in Europe and the U.S and that signifies why more patents come from few recognized areas.Robert Florida is more salient because his presentations add an extra dimension which is disparity. Notably, he builds on what Thomas Friedman puts forward.