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Physics Essay

Uses of Electron Microscope
As early as middle of 19th century, microscopists realized that structures less than half a micrometre could not be resolved with a light microscope. At the same time researchers had hinted at the possibility of improvement in the resolution of microscope using electrons rather than light. This is because accelerated electrons behave in vacuum just like light, they travel in straight lines and have a wavelength which is about 100,000 times smaller than that of light. Also, electric and
Pages: 17 (6250 words), Essay
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Answering couple of questions
The photo data thus collected varies in their pixel depth and is separately considered for different spectral classes for the requirement of quantitative analysis. The essential purpose of this classification is meant for the optimum use of all the brightness levels available in the data. The photo integrated wavelength data are classified into two categories; supervised classification and unsupervised classification. The former is used for extracting quantitative information from remotely
Pages: 8 (2000 words), Essay
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Tutorials Paraphrasing
The echo is generated by a 180° pulse for spin echo sequences, which results in refocusing the all time independent loss of transverse spin coherence. The T2 relaxation curve determines the maximum signal intensity of the echo. An increase in the TE time increases the T2 decay, and decreases the signal intensity.7, and 6.8 show the effect of increase in the TE time with a constant long TR time. - Figure 6.6 is a proton density weighted image and was acquired with a very short TE (20 ms),
Pages: 8 (2000 words), Essay
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Review of a book about physics
The chapters about energy are perfectly written and I hope that this is a book that will be read widely and extensively.A host of problems regarding energy and global warming are in the news day after day. In this excellently written text, the writer provides a careful and smart examination of the matter as well as a dose of soberness on the real and possible solutions. Nonetheless, rare in the field, we find that the text is both up to date, yet written in stylish prose and accessible. The
Pages: 8 (2000 words), Essay
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Multiphoton Excitation for organic complex
Unless, the value of cross section is reach to saturation level.Under fig 4.1, the linear absorption spectra of the organic materials p-PhN-OF(n)-TAZ series (n = 2 ~ 6) was dissolved in Toluene solution, the series exhibits the two absorption peaks characteristics. The weak absorption peak appears around 300-310 nm attributed to the n* transition of triarylamine moieties and the broad absorption band spanning from 378-415 nm corresponds to the * transition of fluorene-based
Pages: 48 (12000 words), Essay
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Geology - Seismic
Both artificial and natural techniques employ different scales of sophistication and the information obtained provides varied detail in terms of usability. Alternatively, cost and availability of technology needed differ for both natural and artificial based investigation techniques. As such, every geophysical investigation technique available has capabilities as well as restrictions, which form part of the decision-making considerations when choosing the appropriate technology to employ.One of
Pages: 10 (2500 words), Essay
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-Cell phone usages and Radiation
Cell phones use a type of electromagnetic energy called radiofrequency (or simply RF) energy for communication. RF are the radio waves and microwaves. On the electromagnetic spectrum (shown in Figure 1), where the energy ranges from ones that have extremely low frequencies with long wavelengths to those that have extremely high frequencies with short wavelengths, the radio waves and microwaves lie between the two extremes. In the RF region, the frequencies are in the range of 3KHz to 300GHz.
Pages: 8 (2000 words), Essay
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Gamma ray
The dependency of the system on voltage has also been demonstrated.Of all the waves in the electromagnetic spectrum, gamma rays are found to have the smallest wavelength and the highest energy (NASA 2007). Gamma rays, like X-rays, are a type of electromagnetic radiation. These rays result from nuclear interaction (Gilmore & Hemingway, 1995). Gamma rays are released from radioactive atoms and also in nuclear explosions (NASA 2007). Figure 1 shows the gamma ray region of the electromagnetic
Pages: 8 (2000 words), Essay
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UK Strategy for Radioactive Discharges
In the prevention of waste disposal or radioactive discharges in one Member State that lead in the contamination of a neighboring Member State’s environment based on Article 37. Therefore, the European Commission makes decision on whether a plan for disposal of radioactive waste can lead in the contamination of the soil, water, or air of another Member State. It is important to state that the defence sites are not subjected to the Euratom Treaty regulation (Department of Energy & Climate
Pages: 8 (2000 words), Essay
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Wave power renewable energy
Other methods include the hydraulic pressure generation, hydroelectric turbine generation and linear generator. The power generation method utilizing the hydraulics captures the wave energy by using the submerged wave columns. When a wave comes, water is hydraulically pressured by the water columns to move the turbine blades directly from the high pressurized water or utilized to be filled in a reservoir. The water from the reservoirs is then utilized to generate energy (Reuk.In some
Pages: 4 (1000 words), Essay
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Organic solar cells chapter 1
He came up with a cell whose efficiency was rated at 1%. He created it by the use of semi-conductor selenium, which was covered with a slight coating of gold forming a junction. Thereafter, this photovoltaic cell was demonstrated by the use the theory of metal-semiconductor obstacle coating (PAGLIARO, PALMISANO & CIRIMINNA, 2008).Later on in 1954, Chapin developed a photovoltaic cell with a power change efficiency of 6%. This was the first Silicon solar cell. This was further enhanced to an
Pages: 10 (2500 words), Essay
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Concepts in Physical Science
The field of chemistry is as ancient as the scientific thought process itself. The earliest record of using metals by humans appears to be gold. It is usually found free or raw in nature and does not include chemical processing to obtain it. It also means that other metals like silver, tin, copper and iron (also found raw in nature) gave the earliest humans an opportunity to work with metals. Democritus was a Greek philosopher who founded the atomistic school where he worked on finding the
Pages: 6 (1500 words), Essay
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Environmental Science
This can involve a slight change in their habits or using more energy efficient appliances. For example, change of habits include:Using cold water to wash laundry and hanging them out to dry instead of using the dryer. This habit will ensure that when doing laundry, less electric energy is consumed, and the one utilizes the abundant natural energy of the sun to dry the clothesInstalling energy efficient bulbs, which save more energy and are longer lasting as compared to incandescent light
Pages: 6 (1500 words), Essay
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Understanding graphene's thermal properties: A phonon prospective
The planes of graphene on the graphite crystal are due to weak van der Waal forces between them. The anisotropic nature of the crystals can be used to determine the thermal attributes of graphene.Basically, the elimination of heat loss in electronic devices has been a problem encountered by various researchers in an electronic industry. Therefore, the industry has put more efforts and resources in searching for better materials which dissipates less heat in order to better improve innovations
Pages: 9 (2250 words), Essay
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Stability of methane clathrate hydrates under pressure: Influence on outgassing processes of methane on Titan
Been molecular simulations and structural analysis conducted and they have indicated that few guest molecules that are responsible for creating very strong hydrogen bonds with the water compound contained in the clathrate hydrate lattice can produce phases that are stable. It has led to a section of scientists considering ammonia as a potential guest molecule for a clathrate. Additionally, research that was conducted earlier coupled with computational studies are of the opinion that in the
Pages: 11 (2750 words), Essay
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Paleontology and earth history
Climate is one of the many factors that make life on earth possible. Within millions of years, the temperatures of the earth have changed to fit bounds that are life-sustaining. The icehouse interval is characterised by three major glaciations in the Phanerozoic Eon. The first one is the Late Ordovician that occurred about 430 million years ago, the second one is the PermoCarboniferous period whose period spanned 325-240 million years ago and lastly the Late Tertiary which started about 35
Pages: 8 (2000 words), Essay
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Radation protection
When the nuclei of the radioactive elements, for instance, uranium suck up neutrons via nucleic fission causing the splitting of the nucleus into smaller nuclei thus the generation of energy, Y-rays, and extra neutrons (Olsson &Aasen,2009). Segments of the remaining neutrons are later absorbed via other atomic particles which then elicit the radioactivity to be a continuous process.For the control of further chained reactions; moderators are used to altering the section of particles of neutrons
Pages: 6 (1500 words), Essay
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Geologic hazard project
Earthquakes have been recorded throughout history for many years. Even before seismographs in early times, there are a record of mysterious ground shaking. It occurs when rocks break along an underground fault. The ground shaking causes vibrations through the earth. The magnitude of the shaking varies on how great the movement along the fault is. When plates shift, they create shockwaves that go through the earth.The shock waves are the actual earthquakes. They go through the earth vibrating
Pages: 5 (1250 words), Essay
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I will upload the artical
Of each residue to the overall protein-ligand/protein binding; thereby helping in the identification of mutations that can potentially enhance the binding affinities of the protein complex.Another advantage is that the information obtained from the simulation can be used to help in the discovery of energetically important determinants of specificity at the various intermolecular protein interfacesThe results are expected to reveal the computational proficiency of MM-GBSA and MM-PBSA as
Pages: 10 (2500 words), Essay
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Why is there oil in Angola What is the geology of the Area How and when did the land form The common point with other african countries with oil
Angola’s important gas and oil reserves are mainly hosted by the presence of marine coastal basins. These basins are mainly of lower Quaternary to Cretaceous age. In addition, these coastal basins are also associated with other mineral deposits such as copper, bitumen, and various chemical and industrial deposits such as potash, phosphate, sulphur, gypsum and limestone. In the south eastern parts of Angola the area is extensively covered by deposits of Kalahari sand. These deposits have been
Pages: 5 (1250 words), Essay
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