Chemically prepared or sensitized material

Chemically prepared or sensitized material INTRODUCTION OF PHOTOGRAPHY Photography is defined as the science and art of producing an exact impression of an object on chemically prepared or sensitized material by using light. It depends on the sensitiveness of silver compound to light. The photographs are usually taken by means of a photographic camera. Camera is an instrument consisting of a light-tight box with a place for the light sensitive film at one end and covering lens or a combination of lenses by which a real, inverted and diminished image can be obtained on the other hand. This instrument called camera is so devised that lens may be moved forward and backward by screw arrangement, with a view to getting a distinct and clear image of an object, placed before the lens, on the film. While it is easy to make comparisons between the pupil of the eye and the f-stop of a camera or between the retina of the eye and photographic film .Once we get past the basic similarities of the optics of the two systems comparisons begin to rapidly break down. The eye is not only much more complex than a camera and its film but the two imaging devices function by different chemical mechanisms. The photographer the automatic exposure system of the camera regulates the f-stop opening and time of exposure of her camera to match the sensitivity of film while the iris and retina sensitivity of the eye adjust to correspond to the light level of the scene. This first installment on the chemistry of photography is intended to introduce in a simplified way the basic concepts of silver halide photography. It will not delve into the physics of optics the functioning of cameras and lenses, photographic techniques, non-silver processes, or the artistic aspects of photography. Photography encompasses many things there is a science to photography, but as a means of expression, it is ultimately an art form. There are many techniques and forms of photography which fill many books in the library and many pages on the Internet. Beyond this point, the actual taking of pictures, style, and good composition will not be mentioned again. Chemistry is an even larger subject area, encompassing all areas of life and invisible details that are often mind boggling. To couple photography and chemistry is narrower than either subject on its own, but still includes a lot of material. These pages will look at some basics, presenting only a small fraction of the information relevant to the chemistry of photography. Photography encompasses many things there is a science to photography, but as a means of expression, it is ultimately an art form. There are many techniques and forms of photography which fill many books in the library and many pages on the Internet. Beyond this point, the actual taking of pictures, style, and good composition will not be mentioned again. Chemistry is an even larger subject area, encompassing all areas of life and invisible details that are often mind boggling. To couple photography and chemistry is narrower than either subject on its own, but still includes a lot of material. These pages will look at some basics, presenting only a small fraction of the information relevant to the chemistry of photography. ABBREVIATION LIST NH4Br→Ammonium bromide. AgNO3→Silver nitrate. Ag Br→ Silver bromide. NH4NO3→Ammonium nitrate. 1, 4-dihydroxy benzene. 2, 4-diaminophenol. C6H6OH→PHENOL. METHODOLOGY Chemical reaction. Process (propagation). Techniques. Material studied. Images. TYPES OF PHOTOGRAPHY:- BLACK WHITE PHOTOGRAPHY. COLOUR PHOTOGRAPHY. BLACK WHITE PHOTOGRAPHY Black and white photography is known for its unique charm, clarity and pureness. It strikes a fine balance between information and inspiration. These features of black and white photography have made the art most appealing though it has tough competition with digital color photography in the present era. Black and white photography is generally practiced by the monochrome photographers all over the world. Monochrome photography consists of black and white photographs A large part of monochrome photography consists of black and white photographs which retained their charm long after the trend of color photography had taken shape. The prime reasons behind the prevalence of black and white photography even in the present era are comparatively lower cost and classic look of black and white photographs. It is interesting to know that all the monochrome photographs are not necessarily pure black and white. There are some black and white photographs which are produced by Cyanotype process and they display shades of blue and white. There was a process called albumen process. It was in use some 150 years ago and the black and white photographs developed with the help of this process had brown shades. (1) Preparation of a photographic film→ Photographic film is thin sheet of cellulose acetate or other polymeric support coated with the photographic emulsion. This emulsion is prepared by adding 20% solution of silver nitrate (AgNO3) to the solution of ammonium (NH4Br) containing gelatin. NH4Br + AgNO3→AgBr + NH4NO3 After the mixing, the emulsion is ripened either by keeping it at high temperature for some time or by digesting it at a lower temperature with ammonia. It is then cooled till it sets to a jelly. The jelly, like mass is washed with water to remove ammonium nitrate. Then the emulsion is applied on a cellulose acetate film is then dried and carefully packed. To the fastness of film depends upon the size the grains of (Ag Br).The larger the grain the faster the film. (2)Formation of latent image by exposure→ Photographic film is mounted in a camera and exposed few second to the image of a properly focused object. An invisible change occurs in parts of film on which light falls depending upon the shape, and intensity of the light reflected from different parts of the object. On the film, the inverted image of the object is formed. This image is called latent image and is not visible in presence of the sunlight. 2Ag Br→2Ag +Br (3)Developing latent image and preparing the negative→ The exposed film is immersed in a solution of a weak reducing agent (developer) like ferrous oxalate or alkaline solution of organic reducing agent like hydroquinone (1, 4-dihydroxy benzene) and (2, 4-diaminophenol). This developer reduces the activated Ag Br grains to Ag at an appreciable greater rate than the unexposed Ag Br according to the equation. This the (developer) act as much more rapidly upon these portions of the film where the illumination was most intense. Here the reduced silver is deposited in the form of black silver. Thus the film becomes darkest where the object was bright and vice-versa. It is called Negative. 2Ag Br+ (1, 4-dihydroxy benzene)+ 2(OH) -→2Ag+(2, 4-diaminophenol) +2H2O +2Br (4)Fixing the image→ After developing the film is till sensitive to light due to the presence of unchanged the Ag Br. There for in order to get the permanent image, it is necessary to remove unchanged Ag Br. This is done by dipping the negative in the fixed bath. This process of the removal of the excess Ag Br is called fixing. Before the fixing and after developing the alkali is removed by dipping the negative in 0-5% acetic acid for short time. Ag Br +2Na2S2O3→Na3[Ag(S2O3)2 +Na Br (5)Printing→ In this process, the negative is placed over a sensitive paper printing paper that has been coated with photographic emulsion (silver bromide with gelatin).The paper is then exposed to light for a fraction of second so that the light passes through the negative. Darker spot on the negative allow less light and dark are reversed and we get a positive. The positive is than developed, fixed, and dried to give the black and white photography. INTRODUCTION TO USING FILTER The use of filters makes the digital black and white photography really interesting and effective. Through this feature, you can easily make out how a particular color appears in a black and white photograph. While using a digital camera for taking black and white photographs, you would require a filter holder so that the filter might be attached at the time of taking the shot. You cannot see the change of tones on the viewfinder. Once you complete taking the image, you can have a preview on the screen. Filters are the addition to the ‘eyes of the camera your lens. Additive, subtractive and special effect are the three basic categories of filters. So before we move on to some advanced types and uses of filters, get acquainted. Filters can be glass or plastic:-Are used for enhancing a photo or adding special effects to the image. At the very least, any filter will act as a cover for your lens. Plain glass or transparent filters: These are primary filters that only serve as protection for your lens. They are not supposed to affect the image in any way. So it is a good idea to check this out before buying. No matter what the season or conditions you are shooting in, it is always recommended to have one of these on your lens. After all, you cant be too careful. Color filters and black-and-white photography: Color filters are best used in black and white photographs to alter or intensify contrasts. The basic filters include Red, Green and Blue along with Yellow. For instance, a yellow filter will make the outlines in an image and it background appear lighter in contrast. So if you are clicking your subject against a dark background then using a yellow filter will make the object seem lighter and brighter in contrast. IMAGES OF BLACK WHITE PHOTOGRAPHY Common Silver Halide Developers

Research Process and Terminology Essay

The purpose for this document is to speak of my description of the research process and these documents will also contain new vocabulary retrieved from this week’s readings. In fact, this document will speak of how this new vocabulary and information applies to a career in criminal justice. In addition, this document will speak of how not knowing the correct vocabulary changes as I conduct the criminal justice research. Furthermore, this document will speak of how knowing the new vocabulary can be an asset to me when evaluating and examining research studies or data. Research Process Research includes a precise method that centers on impartial and collecting a great number of data for showing the results of an examination so that the collector of information can come to an outcome. The method used in the collection of information and evaluation plans regardless if the inquiry and examination process. In fact, the process focuses on testing feelings or concepts. In addition, any new information done without proof or support of the careful examination will not let others look over the study and process the outcome (White, 2013). New Terminology and how it applies to a career in Criminal Justice Replication is the recurrence of controlled procedures or investigations using the same methods (Hagan, 2010). Replication can be used in the career of the criminal justice system by aiding in the DNA process to prove if a person is innocent or guilty of a crime that he or she was been convicted of. In fact, by using the replication process many times will allow the analysis to get the correct results (White, 2013). Verification is proof or exact findings or accomplishments of great certitude in conclusions through extra observation (Hagan, 2010). Verification by law enforcement officers checking and double checking that he or she has the correct information obtained before turning in his or her reports for example, traffic violations (White, 2013). Pure (basic) research is concerned with the acquisition of new data for the sake of science or the development of the field (Hagan, 2010). Scientist in the criminal justice field retrieving new information can aid him or her in any developments that science needs to improve on from prior data (White, 2013). Applied research is practical research concerned with explaining the policy problems (Hagan, 2010). In applied research it helps law enforcement figure out why the old policies are not working and what can be done to improve the policies compared to the past policies (White, 2013). Crime analysis is the systematic, analytic methods directed at supplying useful information related to illegal patterns (Ibid, nd). Crime analysis in the criminal justice field can aid in the career of scientists because he or she uses examinations, violation representations, violation programs, arrest records, law enforcements calls as well as additional means to show applicable data (Wilson, 2013). In fact, crime analysis in criminal justice careers uses identification guides, violation prognosis, target profile analysis, requirements of investigative leads, and requirements to aid data to neighborhood policing and crime prevention programs. An example of a crime prevention program is the Drug Abuse Awar eness Education (DARE) (Gottlieb, Sheldon, & Raj, 1994). Intelligences agencies assist the act of coming to a decision of who is doing what with whom by its focus of the relationship between illegal – and unusual activities for example, narcotics, trafficking, prostitution rings, organized crime, gangs, and terrorists (Gottlieb, Sheldon, & Raj, 1994). Intelligences agencies in the criminal justice system as a career for example, the narcotics division can aid in bringing down individuals dealing in narcotics. Individuals who are assigned to this specific area in law enforcement can gain important information from confidential informants (if any) to help in bringing down the individual or individuals involved in narcotics for example, marijuana, crack cocaine, and heroin. In addition, to the narcotics division there is the Federal Bureau of Investigations (FBI). The Federal Bureau of Investigations (FBI) supplies other law enforcement agencies with services for example, finger print identification (â€Å"Criminal Justice Data Improvement,† 2013). Statistics is the science of collecting, organizing, and interpreting data (Bennett, Briggs, & Triola, 2009). Statistics as a career in the criminal justice field can help scientists organize, collect, and interpret the information needed to for cases for example, by summarizing the information instead of doing each of the experiments separately and easier to gather the information then put it into a summary (White, 2013). How not knowing the correct vocabulary changes as Dena conducts research in criminal justice. When doing research in criminal justice if Dena does not know the correct meanings of the new terms it can lead to wrong and inaccurate information that goes into her documentation. An example of this would be if Dena were writing information for both applied and pure research she could misinterpret the meanings for both of the new terms and when doing her documentation to be presented. The documents that Dena has provided will be wrong and will not give the right outcome therefore, the reports that she turns into her boss will let he or she know that Dena is not as familiar with the new terminology (White, 2013). How knowing the right terminology can be an asset to Dena when evaluating research and information. When looking over the documentation and definitions of each new vocabulary term knowing the right terms will aid in the research Dena will be able to show any mistakes (if any). In fact, if Dena knows the definitions and how each functions then she will be able to continue he r research and find any misspelled vocabulary terms. Knowing the differences between the right and wrong new vocabulary can make a difference when doing a document that has to be presented (White, 2013). In conclusion, learning new vocabulary terms in the criminal justice field aids in the research process. Knowing both of the definitions and what each means will aid in the process for research. In fact, by not knowing the differences Dena can misinterpret one definition for another for example, pure research, and applied research. Statics in the criminal justice field can be beneficial to the scientist because he or she can put the information into a computer and summarize the facts. Summarizing the facts makes it easier on the scientist or analyst because he or she does not have to do each experiment separately. References Criminal Justice Data Improvement (2013). Program Summary, (), . Retrieved from http://www.bjs.gov/index.cfm?=tp&tid=4 Gottlieb, S., Sheldon, A., & Raj, S. (1994), Crime Analysis: From First Report to Final Arrest. Crime Analysis: From First Report to Final Arrest. , (), Hagan, F.E. (2010). Research methods in criminal justice and criminology (8th ed.) Upper Saddle River, NJ: Prentice Hall Ibid (no date) R Wilson (personal communication, July 20, 2013)

Underrated Concerns on List of Exploratory Essay Topics You Should Know About

Underrated Concerns on List of Exploratory Essay Topics You Should Know About Choosing List of Exploratory Essay Topics Is Simple Sometimes the chosen question could be too specific so you'd be able to detect just one or two sources for your research, that's also won't let you an opportunity to compose a bright essay. The most suitable choice selection is about locating a perfect idea for your exploratory essay writing. When selecting an exploratory essay topic, an individual should maintain an objective viewpoint and keep a neutral tone. The choice you make in relation to the topic will learn if your essay gets you good grades. It will assist in organizing the essay and remembering the important facts. The important point to remember is these expository essays are based on facts in contrast to the writer's beliefs or feelings. If you are a newcomer to writing informative essays or simply struggle when it has to do with thinking of informative essay topics, then there's a great chance you may be searching for some help. Before you commence writing your exploratory essay, you should ascertain the variety of paragraphs you're likely to write. An argument could have several premises. Attempt to formulate a very clear question of once you simply begin working on an essay. The thesis statement is the sole sentence that communicates the principal thought of the entire composition. A fantastic thesis statement need to sum up your circumstance all around the topic matter and outline the most important thing misunderstandings you may expect to make within the essay. Colonial rule is thought to be the Dark Age of the history of humanity. however, it is regarded as the very best period for cultural improvement. Following that, you're ready to maneuver on top of these period. Domination of the audio world by Britain Examine the numerous significances that are available in any one specific song. Then there are all the different instruments that you can use to earn music. The most remarkable thing about music is that there's a limitless supply to be found for every conceivable mood. Every individual has their very own favourite artist or song, therefore it isn't an excellent surprise that music can be put to use as a tool for connecting with others and beginning conversations. List of Exploratory Essay Topics - Dead or Alive? Writers of analytic documents should discover enough information about the material they may be writing about. It is possible to revise one another's works for formatting errors. For the exploratory essay to achieve its point, you must keep in mind the next. You ought to use the application form absolutely free of charge. The data and the information that you put in the exploratory essay has to be accurate. It's possible for you to include your everyday duties, characteristics in addition to to-do report and produce your very own personal avatar. You'll get a better idea about organizing exploratory writing and meeting all of the academic standards. There's a remarkable risk involved while looking for a unique business that could offer essay writing aid. The ideal thing about such topics is how you don't will need to devote hours on your paper. In addition, you don't need to devote a lot to acquire the support of our PhD qualified writers. There's no need to check at notes, underline or hurry, just have an amazing tale. Usually, you'll really have to produce promoting advice from no less than a few places. Go searching for the Holiday provides. Check out each of our writing prompts. Therefore, if you're requested to draft an exploratory essay in your school, college or university, it's imperative to select a topic that supplies you with the scope to learn more about the subject vividly and above all learn some helpful lessons while working on the essay. It isn't difficult to locate an excellent exploratory paper topic for college. The main benefit of exploratory essay writing is that the students just like you need not to have a crystal clear idea about the matter. So enjoy exploratory paper prompts the chance to deal with you.

Acute Lymphocytic Leukemia is a Rapid Growing Cancer

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