Light Effects Measurement On Sedimentary Essays - Water, Chemistry

Light Effects Measurement On Sedimentary Particles In Water The purpose of this study plan is to measure the effects of light on sedimentary particles in water. This study plan will include information pertaining to equipment, procedures, and analysis. This plan will also discuss problems that could arise during the sampling. Objectives The objective of this study is to observe whether sedimentary accumulation at various depths will effect the penetration of light energy. One reason for monitoring light penetration is to determine if sufficient energy is available for photosynthesis. This energy is effected by the amount of sedimentation that is suspended in the water. In order to ensure the data's scientific validity this study needs to include the main principles. These include selecting a control; a control will be the measurement that all other data is compared to. Second, the selection of the sample sites must be non-bias and random. This ensures that the experiments are not predictable or foreseeable. Finally the experiments must be described in great detail so that they can be replicated at a later date. Literature Energy is distributed throughout the world's oceans in several usable forms. The heat transmitted during absorption is responsible for ocean waves, temperature and currents. Light penetration in water will measure in units of quanta. This measurement refers to the amount of sunlight that penetrates the water at various depths. The light energy is absorbed and scattered by suspended particles, dissolved substances, and the water itself (USGS). Other factors include attenuation coefficient: rate at which light decreases with depth. This means that each site studied may have a different attenuation coefficient. An example of a high coefficient would indicate a rapid decrease in light penetration, therefore, high sedimentation. Another factor to be aware of is the color of the water. Color can effect the light penetration and intensity. Also the turbidity which is a measure of water clarity and how much material is suspended in the water. Suspended material could include soil particles, algae, plankton, microbes, and other substances (EPA). The sources of the turbidity could include erosion, waste, runoff, and bottom feeders (EPA). Equipment The instruments used to make photosynthetic measurements is called a Li-Cor Quantum/Radiometer/Photometer model #189. The sensory device is connected by a long cord and is used to measure at depth. It's called an underwater PAR sensor; Li-Cor #1925. This sensing device or photocell can also be used to measure surface PAR. Other devices to be used during the data sampling include lowering frame Li-Cor #20095, various weights and cables. The cables and weights will used to hold the sensors in the water column at the proper depths. Another instrument could be used to calculate the amount of PAR that is received at the surface. This instrument is called a pryanometer. It is not a requirement to use two different instruments for surface PAR, but just a suggestion that might give more scientific validity to the data being collected. Procedure While conducting this experiment it is necessary to have at least two people present to take the measurements. One person will lower the sensor in the selected site locations. The other person will record the PAR measurements from the display and calculate range values. The measurements will be taken within a four-hour period, two hours on either side of the solar noon. Solar noon is half way between sunrise and sunset; not 12:00 noon. Solar noon is at 1:15 PM, Central Daylight Time. This is the time when light energy is at the maximum. Samples are taken between 11:15 AM and 3:15 PM and are taken every 30 minutes; and data recorded at 10 second intervals. Before the samples can be taken it is imperative that the Quantum Radiometer be clean and free of debris and calibrated. This calibration will correct errors that may occur. Also the collection of the control data must be present. This control must be free of errors and represent the selected site. Another measurement must be made of the surface PAR. This data will help determine the amount of light energy present at the surface. Next the determination of water columns is important. These sites must be chosen randomly and cover the entire site. Later others can concentrate studies in points of interest. These measurements are taken using the underwater sensor attached to the lowering frame. Each water column will be measured at every 10 cm. These recordings will continue until the photometer can no longer detect light energy. The underwater sensor must be perpendicular to the bottom surface so that light intensity will be scattered

Child Labor in the Global Economy essays

Child Labor in the Global Economy essays Child labor has been an issue of concern for decades. In recent years child labor has been brought to the forefront of media attention by activist groups who have exposed numerous large corporations, such as Reebok, WalMart, and major clothing manufacturers who outsource work to sweatshops around the world. Child labor has become a topic for international organizations concerned with its impact on globalization. Throughout history and within all cultures, children have worked along side their parents in the agricultural field, the marketplace, and around the home as soon as they were old enough to perform simple tasks (Child pp). It was not until the introduction of the factory system that the use of child labor was regarded as a social problem (Child pp). In Britain, during the late 18th century, cotton mill owners collected orphans and children of poor parents throughout the country to obtain their services merely for the cost of maintaining them (Child pp). In many cases, the children were as young as five years old are were forced to work thirteen to sixteen hours a day (Child pp). As early as 1802, social reformers attempted to obtain legislative restrictions against the worst features of the child-labor system, however, little was ever done even to enforce the existing laws limiting work hours and establishing a minimum age for employment (Child pp). Soon, non-pauper children were employed, often with the approval of political, social, and religious leaders, to work in hazardous occupations such as mining, resulting in social problems such as illiteracy, and a multitude of diseased and crippled children, thus, poor families were further impoverished (Child pp). The call for reform steadily increased through the years, and in 1878 the first significant British legislation was enacted, raising the minimum age to 10 years old and restricting employment of ...

Angle Between Two Vectors and Vector Scalar Product

Angle Between Two Vectors and Vector Scalar Product This is a worked example problem that shows how to find the angle between two vectors. The angle between vectors is used when finding the scalar product and vector product. The scalar product is also called the dot product or the inner product. Its found by finding the component of one vector in the same direction as the other and then multiplying it by the magnitude of the other vector. Vector Problem Find the angle between the two vectors: A 2i 3j 4kB i - 2j 3k Solution Write the components of each vector. Ax 2; Bx 1Ay 3; By -2Az 4; Bz 3 The scalar product of two vectors is given by: A Â · B A B cos ÃŽ ¸ |A||B| cos ÃŽ ¸ or by: A Â · B AxBx AyBy AzBz When you set the two equations equal and rearrange the terms you find: cos ÃŽ ¸ (AxBx AyBy AzBz) / AB For this problem: AxBx AyBy AzBz (2)(1) (3)(-2) (4)(3) 8 A (22 32 42)1/2 (29)1/2 B (12 (-2)2 32)1/2 (14)1/2 cos ÃŽ ¸ 8 / [(29)1/2 * (14)1/2] 0.397 ÃŽ ¸ 66.6Â °

Computer Security Essay Example | Topics and Well Written Essays - 750 words - 4

Computer Security - Essay Example Keeping in mind the situation described above publication of a patch and providing technical information about vulnerability during disclosure can enable user’s to take protective and preventive action. CERT, a federally funded quasi government organization, is a key player in the domain of vulnerability disclosure and prioritizes in the publication of preventive measures, such as a patch, in their disclosures. There are certain issues that revolve around the disclosing of vulnerability information. These are regarding the timing of the release of patches which is made critical once vulnerability is disclosed. However the development of these patches takes time. This component clashes with that of instant disclosure, which leaves users defenseless against attackers who can exploit the disclosed vulnerability in the time that it takes for a patch to be released. These are the two critical dimensions that an optimal disclosure policy addresses. For the development of an optimal patch notification policy it is important to estimate the attacker’s and vendor’s behavior. If the vendors do not act quickly to instant disclosure then the formulation of a policy which incorporates this behavior will be strongly discouraged socially unfavorable. But even if vendors develop a patch quickly there lays a need to know how the attacker’s probability of attack changes with the disclosure, and with the patching. Other critical elements that the policy incorporates are a thorough investigation of vulnerabilities that are more likely to be exploited by attackers and hence require immediate attention. These are the ones that the vendor’s need to concentrate on developing patches for. Keeping in mind all these area’s of concern we develop a optimal patch notification policy that balances the issue’s mentioned above. Simply because a vendor releases a patch more quickly due to an early disclosure does not necessarily make this action optimal. Using a game theoretic model Arora, Telang and Xu (2003) show that neither instantaneous disclosure nor secrecy policy is optimal. An optimal patch publication policy depends upon underlying factors like how quickly a vendor’s response is in releasing patches, and how likely attackers are to find and exploit unpatched vulnerabilities. Q2: Here we consider the incentives of the attackers as well as the parties listed previously. What are the incentives of attackers? When we look at the internet we see how it has developed into a global system of interlinked computer networks which have made possible the exchange of information between millions of organizations. It has made possible new forms of social interactions as well as means to probe them. The internet is a unique tool for studying the development and the organization of a complex system. This is why numerous attackers are attracted towards the use of methods to hack into and manipulate various online systems. T here are many classifications of hackers based on the incentives behind their attacks. There are the early gentle hackers, who break into systems to demonstrate their skills. Then there are the ‘black hats’, which might have been gentle hackers at some point but then are motivated to make money as part of an explosively booming business based on ever-present internet insecurity. Moving

Analysis of Literary Criticism about Oranges of Gary Soto Research Paper

Analysis of Literary Criticism about Oranges of Gary Soto - Research Paper Example In his narrative, the poet actually steps in adolescence when he buys something for her girl by taking a chance. He offers an orange and a nickel to the saleslady for the bar of chocolate that the girl chooses. This is a critical point in the life of the boy and the climax in the poem because it creates uncertainty whether the saleslady will accept it or not. Once his offer is accepted, the boy comes out of the superstore triumphantly and enjoys his time with the girl. Although his courage is impressive, the risk was also a safe and intelligent bet: If the saleslady had refused to honor his orange for payment, he would still have the two oranges to share with the girl on their way home. Either way, he proves himself and impresses the girl which was the goal in the first place, and he is rewarded for his bravery by being allowed to hold her hand on the walk home. (White, 123) The poem is divided into two parts- before and after going in the superstore. The tone of the poem and the att itude of the boy have drastically changed. The tension or coldness between them is replaced by warmth and the scenery transforms dramatically. â€Å"Someone might have thought/ I was making a fire in my hands.† (55-56) the poet’s wish has been granted and suddenly the dullness of December as signified by fog and old coats is brightened up with the oranges. The color of orange stands out sharply in contrast to gray December; in fact it even looks like fire. Fire is the antithesis of frost, which was mentioned in the first part of the poem. Frost and crackling ice represent the absence of emotions or passions; but by the end of the poem, the boy earned warmth which is represented by the color of the oranges. In the first part of the poem, when the boy is entering the superstore, he notices a â€Å"used car lot† (18) which represents emptiness and stillness. The emotional state of the boy is empty and still. This condition is transformed in the second part of the p oem where â€Å"A few cars hissing past† (43) denote the movement or transition in the stage of life of the boy. He moves on in life without looking back at it with awkwardness, as he â€Å"finds a new sense of confidence and independence.†(White, 121) The poetic language used in the poem is simple and based on a trivial, everyday experience of a young boy. The language is also kept simple because it is stored in the memory of a person, when he was young- merely 12 years old. His memories are captured in a rather simple manner that makes it easy for the readers to compare or relate their experiences with his. Imagery and symbolism are used extensively by Soto to describe the entire scenery and situation. The boy recalls his vivid memories of walking for the first time with a girl. This shows how important it is for anyone at this age to feel love for the first time. The poet is aware of the external scenes and captures them in his memory- he is aware of all the sights and sounds of the gray December and slowly he starts noticing the various colors that light up his mood and his surroundings. The yellow light in the porch, the color of rouge on the cheeks of the girl, newly planted trees are some of the things that visually describe the scenery. Apart from this, sound imagery also brings to life the entire scene to the readers, as they read the phrases: Frost cracking; a dog barked; the tiny bell; and a few

Dyslexia :: essays research papers

Dyslexia For Children Jimmy’s Story: Jimmy was a 10 year old boy who had done well in school through the third grade. Once he got the fourth grade he was having trouble following the readings as fast as the other children could. He was mixing up words and confusing letters. He was very upset so he told his mom and she decided to check out what was happening. She took Jimmy to the doctor and the doctor had Jimmy take some tests and the doctor discovered that Jimmy had dyslexia. This didn’t mean that Jimmy was stupid, it just meant that he had trouble reading certain words. Jimmy would have to see a special teacher to fix his problem. Facts about dyslexia: 1.Children who are dyslexic are not stupid 2. Dyslexic is a word used to describe children who have trouble putting words together or spelling 3. Although many people may think so, dyslexic people do not see things backwards. 4. Many dyslexic children seem to have good creative skills like drawing, painting or playing a musical instrument. 5. Dyslexia can have more of an affect on one person than it does another or it may have less of an affect on one person or the other. 6. Experts think that 10% of all children have some degree of dyslexia and only 4% have a really bad case of dyslexia. This means that if you have dyslexia, you are not the only one. There are many other children who work with dyslexia everyday. 7. No two dyslexic children are alike. Children who have dyslexia are just like everyone else except they have to work through their reading and writing a little harder. 8. Many famous people have worked through dyslexia for example: Thomas Edison, the inventor of the light bulb; Winston Churchill, Prime Minister of Great Britain and Woodrow Wilson, President of the United States of America.(1) Causes of dyslexia: There is no real answer for the cause of dyslexia. Dyslexia is not contagious so you can’t get it from someone else, it is not in something that you eat and it is not a cough or the flu so it won’t hurt you if you have it. Doctors think that dyslexia runs in families, so it might get passed down from your mom or dad when you are born.(1) Solving dyslexia: The best known solution to dyslexia is working with a special teacher and working hard. There are some medicines that are available (ritalin and adirol) that will help you concentrate better but the way to getting past dyslexia is all in the hard work.

Milo 3 in 1 Substitute and Market Structure

Milo 3 in 1 is a normal product. It is a convenience product to the consumer which comes with low price and easy to consume. The product comes with high quality and safe to consume. Complements for Milo 3in1 are Milo sejuk(ice), Milo Powder and Milo Ready to Drink. Milo sejuk (ice) is an instant ice Milo which just adds cold water to the powder. The powder of Milo sejuk soluble easier with the cold water even without hot water which normally used for melting powder or make them become more soluble.Milo Powder is an ordinary Milo powder with no extraordinary add-ons or plain Milo. Consumer needs to add sugar, condensed milk or creamer themselves with the powder. Normally, Milo powder is packaged in large Milo tin. Milo Ready to Drink is Milo in cans and small package. Consumer buys and consumes straightforward because the Milo inside it is ready to be drink. Substitutes for Milo 3 in 1 are Horlicks, Ovaltine, Vi-Co, Nescafe. Horlicks and Ovaltine is a malted milk hot drink. It is made from malted barley and wheat flour.It comes with different taste and smell compared with Milo which is made from chocolate. It served as a beverage same with Milo and fortified with vitamins and minerals. Vi-Co is commonly known as the straight competitor to Milo. It serves the same hot chocolate milk as Milo. Nescafe serves different kinds of coffee. They start with coffee powder like Nescafe Classic, Gold and 3in1. They also serve a variety of coffee in cans like latte, mocha and cappuccino. Moreover, they have localized product like Nescafe Ipoh White Coffee.Milo 3in1 belongs to monopolistic competition market. It comes as one of the product differentiation by Milo. There are other products such as Milo sejuk, Milo powder and Milo Ready to Drink. It has many sellers in Malaysia and buyers who prefer Milo 3in1 compare to other complements and substitutes. It is the price makers for the same kind of product in the market since the it sells the most compared to others. It also spen t a lot of money on advertisements such as Milo – Fields of Barley TVC and Milo TV: Malaysia Boleh.