Obsidian Hydration - An Inexpensive, but Problematic Dating Technique

Obsidian Hydration - An Inexpensive, but Problematic Dating Technique Obsidian hydration dating (or OHD) is a scientific dating technique, which uses the understanding of the geochemical nature of the volcanic glass (a silicate) called obsidian  to provide both relative and absolute dates on artifacts. Obsidian outcrops all over the world, and was preferentially used by stone tool makers because it is very easy to work with, it is very sharp when broken, and it comes in a variety of vivid colors, black, orange, red, green and clear. Fast Facts: Obsidian Hydration Dating Obsidian Hydration Dating (OHD) is a scientific dating technique using the unique geochemical nature of volcanic glasses.  The method relies on the measured and predictable growth of a rind that forms on the glass when first exposed to the atmosphere.  Issues are that rind growth is dependent on three factors: ambient temperature, water vapor pressure, and the chemistry of the volcanic glass itself.  Recent improvements in measurement and analytical advances in water absorption promise to resolve some of the issues.   How and Why Obsidian Hydration Dating Works Obsidian contains water trapped in it during its formation. In its natural state, it has a thick rind  formed by the diffusion of the water into the atmosphere when it first cooled- the technical term is hydrated layer. When a fresh surface of obsidian is exposed to the atmosphere, as when it is broken to make a stone tool, more water is absorbed and the rind begins to grow again.  That new rind is visible and can be measured under high-power magnification (40–80x). Prehistoric rinds can vary from less than 1 micron ( µm) to more than 50  µm, depending on the length of time of exposure.  By measuring the thickness one can easily determine if a particular artifact is older than another (relative age). If the rate at which water diffuses into the glass for that particular chunk of obsidian is known (thats the tricky part), you can use OHD to determine the absolute age of objects. The relationship is disarmingly simple: Age DX2, where Age is in years, D is a constant and X is the hydration rind thickness in microns. Defining the Constant Obsidian, natural volcanic glass exhibiting rind, Montgomery Pass, Mineral County, Nevada. John Cancalosi / Oxford Scientific / Getty Images Its nearly a sure bet that everybody who ever made stone tools and knew about obsidian and where to find it, used it: as a glass, it breaks in predictable ways and creates supremely sharp edges. Making stone tools out of raw obsidian breaks the rind and starts the obsidian clock counting. The measurement of rind growth since the break can be done with a piece of equipment that probably already exists in most laboratories. It does sound perfect doesnt it? The problem is, the constant (that sneaky D up there) has to combine at least three other factors that are known to affect the rate of rind growth: temperature, water vapor pressure, and glass chemistry. The local temperature fluctuates daily, seasonally and over longer time scales in every region on the planet. Archaeologists recognize this and started creating an Effective Hydration Temperature (EHT) model to track and account for the effects of temperature on hydration, as a function of annual mean temperature, annual temperature range and diurnal temperature range. Sometimes scholars add in a depth correction factor to account for the temperature of buried artifacts, assuming the underground conditions are significantly different than surface ones–but the effects havent been researched too much as of yet. Water Vapor and Chemistry The effects of variation in water vapor pressure in the climate where an obsidian artifact has been found have not been studied as intensively as the effects of temperature. In general, water vapor varies with elevation, so you can typically assume that water vapor is constant within a site or region. But OHD is troublesome in regions like the Andes mountains of South America, where people brought their obsidian artifacts across enormous changes in altitudes, from the sea level coastal regions to the 4,000-meter (12,000-foot) high mountains and higher. Even more difficult to account for is differential glass chemistry in obsidians. Some obsidians hydrate faster than others, even within the exact same depositional environment. You can source obsidian (that is, identify the natural outcrop where a piece of obsidian was found), and so you can correct for that variation by measuring the rates in the source and using those to create source-specific hydration curves. But, since the amount of water within obsidian can vary even within obsidian nodules from a single source, that content can significantly affect age estimates. Water Structure Research Methodology to adjust the calibrations for the variability in climate is an emergent technology in the 21st century. New methods critically evaluate the depth profiles of hydrogen on the hydrated surfaces using secondary ion mass spectrometry (SIMS) or Fourier transform infrared spectroscopy. The internal structure of the water content in obsidian has been identified as a highly influential variable which controls the rate of water diffusion at ambient temperature. It has also been found that such structures, like water content, vary within the recognized quarry sources.  Ã‚   Coupled with a more precise measuring methodology, the technique has the potential to increase the reliability of OHD, and provide a window into the evaluation of local climatic conditions, in particular paleo-temperature regimes.   Obsidian History Obsidians measurable rate of rind growth has been recognized since the 1960s. In 1966, geologists Irving Friedman, Robert L. Smith and William D. Long published the first study, the results of experimental hydration of obsidian from the Valles Mountains of New Mexico. Since that time, significant advancement in the recognized impacts of water vapor, temperature and glass chemistry has been undertaken, identifying and accounting for much of the variation, creating higher resolution techniques to measure the rind and define the diffusion profile, and invent and improved new models for EFH and studies on the mechanism of diffusion. Despite its limitations, obsidian hydration dates are far less expensive than radiocarbon, and it is a standard dating practice in many regions of the world today. Sources Liritzis, Ioannis, and Nikolaos Laskaris. Fifty Years of Obsidian Hydration Dating in Archaeology. Journal of Non-Crystalline Solids 357.10 (2011): 2011–23. Print.Nakazawa, Yuichi. The Significance of Obsidian Hydration Dating in Assessing the Integrity of Holocene Midden, Hokkaido, Northern Japan. Quaternary International 397 (2016): 474–83. Print.Nakazawa, Yuichi, et al. A Systematic Comparison of Obsidian Hydration Measurements: The First Application of Micro-Image with Secondary Ion Mass Spectrometry to the Prehistoric Obsidian. Quaternary International  (2018). Print.Rogers, Alexander K., and Daron Duke. Unreliability of the Induced Obsidian Hydration Method with Abbreviated Hot-Soak Protocols. Journal of Archaeological Science 52 (2014): 428–35. Print.Rogers, Alexander K., and Christopher M. Stevenson. Protocols for Laboratory Hydration of Obsidian, and Their Effect on Hydration Rate Accuracy: A Monte Carlo Simulation Study. Journal of Archaeological Scie nce: Reports 16 (2017): 117–26. Print. Stevenson, Christopher M., Alexander K. Rogers, and Michael D. Glascock. Variability in Obsidian Structural Water Content and Its Importance in the Hydration Dating of Cultural Artifacts. Journal of Archaeological Science: Reports 23 (2019): 231–42. Print.Tripcevich, Nicholas, Jelmer W. Eerkens, and Tim R. Carpenter. Obsidian Hydration at High Elevation: Archaic Quarrying at the Chivay Source, Southern Peru. Journal of Archaeological Science 39.5 (2012): 1360–67. Print.

Google's company acquisition and partnership Essay

Google's company acquisition and partnership - Essay Example Google Company has also licensed the platform that has helped limit control over activities that hardware makers do with android. Due to this control, the company has been able to produce androids with unique functions and features that satisfy customer needs (Lee, 2012). Partnership is a legal relationship by which companies formed through signing of an agreement carry on business as co-owners. Samsung and Google signed a ten-year partnership to license each other’s current patients and those filed in the future. As a result, Samsung will now be able to access the patents Google garnered as part of its $12.5 billion acquisition of Motorola in the year 2011 (Glasby & Dickinson, 2014). There are various reasons as to why Google is in android takeover. Firstly, it is their growth strategy. Android demand has been increasing and due to this, Google Company will be in a position to develop their business by meeting needs of customers. Therefore, making profits that will enable them expand the business (MCmorris, 2005). Secondly, their acquisition will help them diversify their risks. The addition also helps in meeting customer needs by producing androids with unique features and functions. Android phones have also been on demand to replace iPhones. The replacement of this product would mean increasing sales of androids hence increasing profits. The result will help in the development of the firm and expansion of the company, as well as assist in familiarizing the company products with the consumers. The other primary reason for the acquisition is helping Google advertises their company. Since androids are globally used, adding Google apps may assist the organization to make product promotion feasible. Another crucial reason is the talented engineers in Android Company and their great technology. Google wanted the engineers to help in

Have people become overly dependent on technology Essay

Have people become overly dependent on technology - Essay Example Body Paragraph 1: Human beings are dependent on technology for entertainment. 97% of the surveyed population stated that they prefer playing video games and they play these games on a continuous basis (Lee, 2010, p.60). Paragraph 2: Organization’s pursuit for excellence, effectiveness and efficiency has led to the replacement of human labor with robotic labor. Drones are used to conduct surveillance and attacks. Paragraph 3: Technology has even influenced and become a major part of the society’s educational sphere. Presidents of 77% of the colleges surveyed state that their college is now providing online courses (Parker, 2011). Paragraph 4: Technology is used by human beings to socialize. Use of Face book and mobile phones has replaced face to face communication. Paragraph 5: Counter Arguments Conclusion Dependency on Technology Introduction Technology is recognized as a monster and even as a prophet. Individuals today have become so addicted to technology that they sp end several hours of their life on computers, just clicking the mouse for the entire day. Similarly, there are those who simply sit on their beds or any other comfortable place and continue to burn their thumbs while texting to different friends at the same time or alternatively. All they do is share and talk about things that might not be of any importance to both the text sender and the receiver. There are even events when individuals tend to spend limitless days in their room without being concerned about the outside world and their work. Such people even tend to experience anger if for even a minute second their internet connection breaks down and they are not able to be online. Technology has become a part and parcel of every individual’s life, technology has become a part of education, business as well as entertainment and this has resulted in heavy dependency of individuals over technology. It is commonly believed that with the assistance of technology life has become quite easy, but the truth is that technology has made society heavily dependent on it and Technology has become a part of different aspects of society including: entertainment, employment, Education and socialization. Body One of the major negative impacts of technology is that the current generation especially the teenagers and young adults have become very lazy as compared to previous generations. Several examples of such events can be seen in the everyday life of the individuals living in the society. For example: previously children use to go to different grounds and sporting events to gain entertainment and play different outdoor games. Now children have changed this preference and they spend huge amount of time playing games at home with the assistance of the computers, PSPs and PlayStations. According to a research conducted by PEW on 1,102 individuals who aged between twelve and seventeen, 97% of the surveyed population stated that they prefer playing video games and they pl ay these games on a continuous basis and around 50% of these respondents even stated that they had played such games the day before the survey was conducted (Lee, 2010, p.60). The Center for Disease Control and Prevention have figured out that during the period of 1980 there were a total of 7% obese children in US and twenty eight years later, the number of obese children elevated to 20% (Theoharis, 2012, p.191). This strongly shows that

The Benefits of Eating Raw Foods Essay -- essays research papers

Amanda is a twenty-something year old going to college in a big city. She lives in one of the identical shoebox-sized dorm rooms with a room mate. She wakes up in the early afternoon each day and shuffles to her first class. By the time her classes are over for the day she is famished and feels utterly empty of any sustenance. She looks around for the nearest place that she could get as much food as she wants for the least amount of money possible. She sees the dining hall of her university, but they only serve realistic portions of reasonably healthy food for a not completely reasonable price. Not what she?s looking for. She then decides to hop into her old, but reliable car and drive to the nearest McDonalds to satisfy the raging hunger within her. She orders a Big Mac, then another, with extra large fries, a large soda and two apple pies. She devours the food with animal like savageness. Soon she is bloated and miserable. Her stomach is so full that she must unbutton her already bursting at the seams jeans. She drives back to the residence hall and plops on her bed to take a nice long nap after that exhausting meal. When she wakes, she immediately clutches her stomach writhing in pain. When it?s all over she lay there covered in sweat, her head pounding and splitting at the same time and yet again completely empty of sustenance. ?Something has to change,? she thinks to herself. Amanda then starts to eat foods completely opposite her usual diet. She has more energy throughout the entire day. She needs less sleep and feels more rested when she wakes up. Her mind is clear and answers come to her quickly without having to search her memory. She no longer has headaches or any other body aches. She loses all of the excess and s... ...d and knife. That?s it! You save time and money and are all the better for it! Eating only raw food also benefits the environment. It takes far less land to raise raw foods than animals, which conserves natural habitats. Eating only raw food produces far less trash to pollute the environment than cooked and processed foods. Think of all of the packaging that goes to food. All of the trees cut down for paper packaging and all of the oil used to create plastic packaging. Most of it just gets thrown away and pollutes the environment. The process of making plastic alone pollutes the environment. The gases and smoke from the factories billow up into the air and then into our lungs, or off to destroy the O-zone. So in conclusion, eating only raw and vegan foods not only has outstanding benefits to your health and appearance, but it benefits the world around you as well.

An Artistic Story of New York City in 1932

November 17, 2012 Essay II, Word Count: 2268 An Artistic Story of New York in 1932 The purpose of this essay is to discuss the ways Stuart Davis uses the elements of art and principals of design in his painting, New York Mural, 1932. In the beginning of this essay, there is a description of Davis’ biological information and what was happening in New York during the years preceding the painting. It will discuss three elements of art to include: line, shape and color. The principals of design that will be discussed are unity, balance, and variety.It will close with my personal reflection and experience that was gained from the analysis and research of the painting. Davis was born in Philadelphia, Pennsylvania in 1892 to parents that were artists. His father was a newspaper art director and his mother was a sculptor. His family moved to East Orange, New Jersey when he was nine years old. He attended school in New Jersey and left high school in 1909 before graduating to attend Hen ri’s School of Art in New York City. He became acquainted and formed friendships with mentors, John Sloan and George Luks. These men were all part of â€Å"The Eight†.These men were all part of the Realist Art Movement and focused on poverty and the realities of urban life for real people. He began exhibiting his art in 1910 and had his first exhibit in New York City. In 1912, he was employed by a left leaning journal that under the direction of Sloan. While he was there, participating in the groundbreaking Armory Show. His work still was in the realist mode until 1916 when he went on his own to become more of an abstract artist. He was drafted and stayed in United States as a cartographer creating maps for the US Army Intelligence Department.Fortunately, that was short-lived and he began using a Cubist style on his work. He made a series with this Cubist style of works based on a tobacco series. He began an eggbeater series while having Edith Halpert of New Yorkâ€⠄¢s Downtown Gallery of Art. This series began his journey away from European influenced Cubism to his own development of his own abstractive modernist style without human presence in his works. He went to Paris in 1928 and upon returning in 1929, he became fascinated and intrigued with the industrialism and post war architecture in New York City.His words were quoted by Karen Wilkin, â€Å"On my arrival I New York I was appalled and depressed by its gigantism. Everything in Paris was human size, here everything was inhuman. It was difficult to think either of art or oneself as having any significance whatever in the face of this frenetic commercial engine. † (Wilkin, 127). At this time, the Great Depression he created relatively few works, but he constantly changed scale, medium and method, making easel paintings, ink drawings, murals and lithographs (Wilkin, 127). His art reflected social issues and his works were pictures that tell a larger story.New York Mural was his mos t ambitious treatment of the city in which he touched upon the issues of prohibition, government corruption and the affairs of Al Smith (Weber, 10). His journals and historical data during these few years in the New York City political scene are confirmation of the journalistic story he told through New York Mural. It was an outrage that many foreign artists were commissioned to do work in the United States. The Museum of Modern Art in New York organized an exhibit of contemporary murals. This show is why Davis created the New York Mural.It stirred much controversy because of the story it told about New York’s economic, social and political climate. Davis wrote in his personal papers, now in collection at Harvard University: Modern art is a reflection of the advanced modern technology. Modern Art in turn has changed to industrial design (Weber, 10). In 1932, Davis painted the piece that is the topic of this essay, New York Mural. He used oil which did not dry quickly and gave him the ability to change and modify colors and lines days later. Oil paint is flexible and it was easy for him to achieve a rich luminosity while having smooth effects with a high level of detail. DeWitte, Larmann, and Shields, 186). His paintings were now made up of modern industry images with free association and with a decorative pattern that created an optical vibration (Weber, 13). The most dominant principle of design used in this piece is variety because of the artist’s use of various elements of art to include: line, shape, color, form and space. Each element has many purposes to hold the views attention. As you look at the picture, these elements are effective in bringing your attention to every detail as you look around the work of art.Variety makes this picture of the skyline diverse and like no other picture of New York City. The use of lines is complimented by the variety of color used in the painting. The oil provides a shiny surface that allows the lines to b e hard and well defined. Within each line are many colors hues of color. The solid primary colors give the lines true definition. Many of the colors are complementary which seems to help contract the objects while achieving depth, especially between the buildings. Some areas of the picture have both crossed-hatching and hatching and neutral solid spaces and shapes.This helps create darkness and lightness in the details of many of the objects. Along with solid black and white areas, the hatchings create shadows and make the picture appear three-dimensional. The buildings appear in the background and random objects in the foreground because of the black surrounding the bottom images in the picture. When you are standing back from the picture you know it’s a building facade but cannot see the defined shapes of the building. The cross hatching and neutrals colors help this happen as if you were in the city looking at distant buildings.The colors are all basic colors of the spectr um with the exception of black and white in the foreground and background to create a dramatic sense of depth and value. These hues are in different shades and saturations. For example the yellow in the banana and tigers’ head is close to its highest level of saturation. The yellow building is a lower saturated yellow because it is mustard in color by having brown mixed into the paint. The black used in the background, lines and inside the buildings help show the defined shapes of the objects in the piece.The white achieves many of the same things while this absence of color is used to show brightness and the feeling of daylight where it is in the background. There is an obvious contrast by the black and white that creates the symbolism of night and day. With these neutral colors there is no need for implied lines as your eyes wonder around the picture. The directional lines are used to bring your eyes upward in the painting to the tallest building in the center which could b e considered the main focal point. It is almost in the centerline of the piece which helps to achieve symmetry and balance.This building is recognizable as the Empire State Building, the newest and tallest building in New York in 1932. Horizontal Lines bring your eyes up into the skyline while the vertical and diagonal lines create depth and dimensions. The curved lines with both thin and thickness to them help you to notice various symbols that explain the story Davis is trying to tell of that time. The foreground has many shapes utilizing volume and space that take time to identify. These contour shaped images create volume and space in the foreground.While the yellow banana is recognizable, it has a an organic shape that makes you look closely to make sure that is what he is showing the viewer. The green banana is not as recognizable because of its dark hue of green even though it is analogous to yellow. There are mostly geometric shapes in the city’s skyline. The only cur ved line and shape is in the shape of a funny face with a hat at the top of the purple building to the right where the three orange circles look two eyes and a nose. Symmetry is achieved through a well balanced picture.Both sides are equally filled with positive shapes and vary with and same amount of negative space. There are concentric geometric shapes for the windows in the buildings, this creates contrast between the different buildings heights and widths. It also gives symmetry to each individual building. The six large rectangles behind the gas pump make it recognizable as a gas station with the garage door in front. The use of colors and lines help the entire picture to appear balanced. The principle of design, proportion, is used throughout this piece of art. The tiger’s head and tail are recognizable in a cartoon like image.If you did not have the research and narrative of what was going on in this time period of the artist’s life, you would not understand why it is randomly placed to the right bottom of the closest building in the foreground of the buildings. The entire painting has the cartoon like feel to it. Especially with the exaggerated proportions of the hats, bananas and what looks like a butterfly on the right side boarder. These things are not to scale with the rest of the parts. The scale is in different proportions and it is mostly dramatic between the foreground and the skyline which appears father away.The best example in the foreground is the proportion of the bananas, tire and hat. It would be a very small tire and hat or a very large banana in realistic. Davis uses scale to exaggerate some of the messages that he is trying to tell about the many things that were taking place during this time. Many of these images are defined further through many of Davis’ later paintings that are enlarged and elaborated versions of this original painting. In a genius way, Davis achieves unity through this picture when you view it as a whole.There is a direct message that the whole is greater than the sum of its individual parts (DeWitte, Larmann, and Shields, 121). He splatters various colorful shapes and organic images to tell the story. Upon first glance, the draw to this picture was because the noticeably recognizable skyline of New York City. I love New York City more than any other place that I have ever lived, worked or played. After gazing around it for a few moments, I could see many random objects beautifully tied and linked together through symbols made of shapes, space, lines and many bright, shiny colors.It was puzzling because I did not know specific facts of history. It was obvious to me that each thing placed in the painting was deliberate and told a story. I was very interested to hear why these random objects surrounding the geometric shaped skyline were of significance to the artist at that moment in time. It is very busy, but also balanced achieving unity and balance. After reading about the artist and his other works, I was fascinated by his ability to not only tell a story but to practically expose the negative and positive events and achievements of that time.His ego and boldness was obvious to me when I realized the offending nature of some of the references he was making representing specific people he knew and was around in New York City. I feel as though I have read a book about New York City’s growth and struggles after the crash of the stock market in 1929 through the early 1930’s. I am also grateful, to the authors of books and articles that explain what was happening and researches what the artist meant with different aspects of their pieces of art. I am a new fan of Davis because I love his bright shiny pictures depicting the city I love and am interested in.He loved New York and enjoyed it while noticing some of the growth and change making the city less intimate and large and filled with the potential and realities for corruption. I belie ve he admired and was impressed with the new buildings and infrastructure in the city while acknowledging that it had to come at a price of greed and a degree of coldness rather than prosperity and warmth. This essay makes me more interested in the stories behind the pieces of art and the artists that created them. The thoughts, history and personal situations are fascinating and give me a different appreciation for New York Mural.I am going to stay mindful and open to enjoy a piece of artwork just for its beauty and the talent that it took to create rather than the book of truth and theoretical information behind it. Works Cited Debra J. DeWitte, Ralph M. Larrman, and M. Kathryn Shields, Gateways to Art, 2012, Tharmes & Hudson Weber, Bruce. Stuart Davis’ New York, 1985. Norton Gallery of Art, West Palm Beach Wilkins, Karen. Stuart Davis, 1987. Cross River Press, ltd. Davis, Stuart. New York Mural. 1932. Oil on Canvas. Norton Museum of Art, West Palm Beach. 84 inches x 84 inc hes, signed and dated Date viewed: November 4, 2012

Cyber Security And The Internet Essay - 1757 Words

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Teen Pregnancy Research Paper - 1273 Words

The Effects of Pregnancy Among Adolescent Girls Heather Thedford HS 2013: Health Communications Texas Woman’s University DESCRIPTION Teenage pregnancy is defined as a teenage girl, usually within the ages of 13-19, becoming pregnant (Unicef 2008). These are young girls that have not yet reached adulthood, who are engaging in unprotected sex and have conceived a child from that encounter. Risk Factors Associated with Teen Pregnancy Teen pregnancy has severe health risk factors for the teen mother and for the unborn child as well. Research shows that teen mothers are less likely to get proper prenatal care. Resulting in babies that are more likely to be born prematurely or of low birth rate. This can cause â€Å"chronic respiratory†¦show more content†¦In 2015, the national teen birth rate for non-Hispanic white females was 90,833. The teen birth rate for non-Hispanic black females was 50,039. Along with the teen birth rates for Hispanic 80,364, American Indian/Alaska Native 4,738, and Asian/Pacific Islander 4,297. The national percentage of teen pregnancies to girls under the age of 15 was 1 percent. Girls age 15-17 was 26 percent and girls age 18-19 was 73percent. Texas is 5th in the nation when it comes to birth rate for teen pregnancies. In 2015, the number of teen births in Texas was 32,687. That is 34.6 births per 1,000 women. This is an 8 percent decrease from Texas’s peak in 1991 at 56 percent. As you can see, Texas’s teen birth rate is slightly higher than our country’s average birth rate of 22.3 per 1,000 women. Texas is ranked 46th on a scale of 1 (lowest) to 50 (highest) in teen birth rates and teen pregnancy rates. The number of teen pregnancies in Texas by race/ethnicity in 2015 are just as diverse. Teen pregnancy to Non-Hispanic White females was 7,376. Teen pregnancy to Non-Hispanic Black female was 4,619. Teen pregnancy to Hispanic was 22,745. 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