Determination of the amount of dissolved oxygen Essay

Topic : Determination of the amount of dissolved oxygen in a water sample by iodometry-the winkler’s method. Objective: To determine the amount of dissolved oxygen in a water sample by iodometry- the winkler’s method. Apparatus: volumetric pipette, 3 conical flask, burette, burette clamp, Pasteur pipette, reagent bottle, conical flask stopper, retord stand, white tile Materials: 2 ml manganese sulphate solution, 2 ml alkaline-iodine solution, 0.025M sodium thiosulphate solution, 2ml concentration sulphuric acid, starch solution Procedure 1. When sampling water, care must be taken to ensure that a good representative sample of the water to be analyzed is obtained. For most purposes, this includes attention to dissolved gases. Therefore, the water sample should be taken in a clean bottle which must be filled to overflowing and tightly sealed with stopper without introduction of air. If the water is sampled from a tap, it must be allowed to run for at least 5 minutes prior to sampling. For this purpose, you may collect the water into a 1 L reagent bottle fitted with a stopper. 2. The stopper is removed carefully from the conical flask and 2 mL of the manganese sulfate solution is added, discharging the reagent from the tip of a pipette put well below the water surface. Stopper is replaced. 3. Similarly, 2 mL of the alkaline-iodide solution is introduced. 4. The stopper is placed in the bottle, be sure that no air becomes entrapped. Some overflow may occur. The content is mixed thoroughly by inversion and rotation. Manganese hydroxide is precipitated and will settled on standing. 5. When the precipitate has settled, 2 mL of concentrated sulfuric acid is introduced with the tip of the pipette well below the surface of the solution. 6. The stopper is replaced and mixed until the precipitate dissolves completely. The dissolved oxygen now liberates free iodine from the potassium iodide present. 7. Pipette 200 mL of the acidified sample into a 500 mL conical flask and titrate with 0.025 M sodium thiosulphate until the solution becomes pale yellow. 8. Add a few drops of starch indicator and continue the titration to the disappearance of blue color.  (If the blue color doesn’t appear after adding starch, repeat the titration and adding starch before start of titration ) 9. Repeat the titration twice. Treatment of data: Titration number 1 2 3 Final volume (cm3) 18.0025.5018.50 Initial volume (cm3) 10.0018.0025.50 Volume used (cm3) 8.007.507.00 Average volume of titrant required for titration = 7.50 cm3 Calculation Concentration (ppm) of dissolved oxygen in the water sample. Mol of S2O3 2- used=0.0001875mol Mol of S2O3 2- =0.000046875mol Mass of O2=[0.000046875Ãâ€"2(15.999)]=1.4999mg 1000ml of tap water=7.5mg O2 Concentration of DO in water sample=7.3mg/L Discussion: The Winkler test is used to determine the concentration of dissolved oxygen in water samples. Dissolved oxygen (D.O.) is widely used in water quality studies and routine operation of water reclamation facilities. An excess of manganese (II) salt, iodide (I–) and hydroxide (OH–) ions is added to a water sample causing a white precipitate of Mn(OH)2 to form. This precipitate is then oxidized by the dissolved oxygen in the water sample into a brown manganese precipitate. In the next step, a strong acid is added to acidify the solution. The brown precipitate then converts the iodide ion (I–) to iodine. The amount of dissolved oxygen is directly proportional to the titration of iodine with a thiosulfate solution. Iodemetry reacts directly, fast and quantitively with many organic and inorganic substances. Because of its relatively low, pH independent redox potential and reversibility of the iodide/iodine reaction, iodometry can be used both to determine amount of reducing agents and of oxidizing agent. In my first titration, initial reading is 10.00 and final reading is 18.00. The titrants used is 8.00. In my second titration, initial reading is18.00 and final reading is 25.50. The titrants used is 7.50. In my third titration, my initial reading is25.50 and my final reading is 18.50. The titrant used is7.00. Adequate dissolved oxygen is necessary for good water quality. Oxygen is a necessary element to all forms of life. Natural stream purification processes require adequate oxygen level in order to provide for aerobic life form. As dissolved oxygen levels in water drop below 5.0mg/L, aquatic life is put under stress. The lower the concentration, the greater the stress. Oxygen levels that remain below 1-2mg/L for a few hours can result in large fish kills. Total dissolved gas concentration in water should not exceed 110 percent. Concentration above this levels can be harmful to aquatic life. Conclusion: The concentration of DO in tap water is 7.5ppm.

The History of Riverview essays

The History of Riverview essays Riverview Park was an amusement park that ran from 1904 to1967. It was Chicagos first amusement park. It was billed as the worlds largest Amusement Park throughout its 64-year popularity. To many it was a rite of passage and their earliest child hood memories. It was a place of fabulous family outings, a magical kingdom where good friends could go for a terrific time, and eventually a romantic spot. Riverview was located on Western and Belmont Avenues in Chicago. It was surrounded by the Chicago River and Lane Tech High School. The Der Nord Chicago Schuetzenverien, a spin-off group of the Kriegs Verein of Chicago, purchased the land bounded by the Chicago River and the above avenues in order to use it as a shooting range. They later changed their name to the North Chicago Sharpshooters Association. The 22-acre park was dubbed Schuetzen Park by the Germans, and Sharpshooters Park by the locals, who began asking the private association if their grounds could be rented for picnics . Around the turn of the century, the Sharpshooters Association dissolved and two members purchased the land. The two members were Wilhelm (William) A. Schmidt, a baker, and his partner George Goldman. Wihelm Schmidt put in swings and some rides for the ladies and children and Riverview was born. After it had opened Wihelms son George began to expand the park with ideas he had picked up in Europe from such parks as Tivoli Gardens. He suggested that they add rides to grounds and with the help of a financial backer Riverview became a full-blown amusement park in 1904. With the opening of the new Riverview Amusement park came three substantial rides. The three great rides were the Strat-O-Stat plane, the Carousel, and The Chutes. The first ride, the Start-O-Stat was also known as the Aero-O-Stat Plane. It was a plane that circled around the center tower and began to pick up speed and height as the rid...

Facebook Author Pages Is It Still Worth Your Time

Facebook Author Pages Is It Still Worth Your Time A Facebook Author Page, Still Worth It? Facebook’s decision a few years ago to limit page owners’ â€Å"organic reach†- and force them to pay to reach their followers- saw many authors getting frustrated at the dwindling number of fans who saw their posts. Several decided to shut down their Facebook author page altogether and switch to an â€Å"author profile†, a dangerous tactic as Facebook has strict rules about profiles and in particular profile names.As indie author Jerry Stoute puts it: â€Å"First you work your tail off to get followers, then Facebook bleeds you to reach them through boosting. How about Facebook allow all your posts to be seen by your followers?†Is Facebook being unfair? Should you really bother growing a fanbase there if you have to pay to reach it afterward? The short answer is yes. For the long answer, we actually did a bit of research on different Facebook writing groups, asking authors how and why they keep a Facebook author page.But I'll only reach 10% of my fans†¦You might not reach everyone of your fans when you post something on your Facebook author page, but this is the same on other big social networks. Your tweets are seen by only a fraction of your Twitter following - not that Twitter hides them, but they soon get buried under hundreds of other tweets in your followers’ feeds. The same goes for Pinterest, or Instagram.So, sure, say you’ll only reach 10% of your Facebook followers, that’s still something you can take advantage of. The way Facebook’s algorithms work to show users content is through analyzing what content you interact with. The more a given user will like, comment or share your updates, the more they will keep seeing them.This means that these 10% you will reach will be your true, core Facebook fans. You definitely want to stay in touch with those, as contemporary romance author Christine Claire MacKenzie explained to us: â€Å"FB is the number one place I connect with fans. FB is where readers reach out to me. It's a slow process to build a valid reader base of rabid fans, but it's well worth the effort.†How can I increase my  Facebook Author Page reach?How about, instead of reaching 10% of your fans when posting, you reached 50%? You don’t necessarily need to pay for that, you just need to make Facebook happy. In the end, Facebook works pretty much like Amazon. If it detects that users have a positive interaction with your content, it will reward you by showing it to more. So, though the standard â€Å"reach percentage† is around 10%, you can multiply it quite easily by consistently posting text, images, videos and links that you know your audience is going to enjoy and share.Let’s take the example of author Rebecca Howard. Her Facebook author page has close to 4,000 people on it and she tells me each post is now seen by about 50% of those folks. â€Å"If I can encourage comments on it or get a discussion going then that number rises. It just takes time to learn how to adapt to the changes and make them work for you. This post of mine, for instance, has been shared 99 times and seen by more than 14,000 people. Didn't pay to boost it.† As with any way to reach or interact with readers, Facebook posting is a trial and error thing. Of course, there are some basic tips and guidelines for maximizing engagement, like posting images, keeping descriptions short and sweet, asking questions to spur a discussion, sharing useful links, keeping self-promotion to a minimum, etc. There are even professional studies out there on what types of posts (image, link, video, text) have a higher average reach percentage.Though you should certainly strive to follow this advice, in the end it is all about finding what your audience wants to see. And there is no other way to do that but to try as many things as possible: offer a giveaway, host an author QA event, post an excerpt or a short story, post a picture with a quote, organize a poll for your fans to choose your next character’s name, etc. There are countless things you can do! Of course, if you fall into the routine of posting the same stuff every day, then your reach will p rogressively decrease because no one will engage with your posts. I like this example Joanna Penn gives in her last podcast interview:â€Å"I just did just a normal post on Facebook and I posted some pictures. I went to a cemetery, Highgate Cemetery, last weekend. I got the most engagement ever on my fiction Facebook author page with these pictures of graves. And I was like, ‘Oh, my goodness. My audience likes graveyards and cemeteries.’†More often than not, your audience will have very similar likes and dislikes to yours - after all, they’re your readers, right? But you might have to think â€Å"outside the box† to find those.  I imagine that sounds like a lot of effort to go through to reach even 50% of followers that you acquired. And if you want to reach more, yes, you have to pay.I thought social media were free†¦Surely, giving money to Facebook can’t be fair? Maybe not, but if you look at the alternatives, you won’t find any better. Here’s what author Alexis Dubief wrote me when I asked her that question:"As writers we're supposed to avoid cliche, but when it comes to connecting with readers, there is no such thing as a free lunch. Email is, and deserves to be, the gold standard of connecting with readers. But email costs money (Mailchimp and Aweber both start charging when your list grows above 2,000 people) and even then, only 30% of your subscribers will open your email messages. So perhaps we need to let go of the idea of 'free' and focus instead on 'cheap and effective.'" This â€Å"business† mindset is one that many independent authors have adopted, shifting the focus from â€Å"cost† to â€Å"return on investment†. As we have seen in previous interviews with Nick Stephenson and Mark Dawson, Facebook provides an advertising platform like none other, mostly because of how granular you can get in your targeting.So, sure, you have to pay a bit if you want your posts to reach all your followers. But you can also pay to reach many more potential readers, and attract traffic to your website for amounts as low as $.01 per click.Below is a screenshot of one of Alexis’ campaigns to support a post. It was seen by over 40k people and she only paid for clicks. She set it both for the post to reach her current fans and to reach people who fit her target criteria but were not fans of her Facebook author page. Have a look at the cost per clicks†¦ As she  puts it: â€Å"Do you know where else I can get highly targeted traffic that cheaply? Yeah, neither do I.†Of course, we’re not saying that every author should keep a Facebook author page, post regularly, and pay to boost some of their posts. Nor that everyone will have  the same  costs per click as Alexis. It vastly depends on your target audience, how active they are on Facebook, and how much testing and iteration you do.The point here, however, is that you shouldn’t shy away from a platform just because it changes its rules, or suddenly seems â€Å"unfair†. Keep a cold head, do the math, and see if they work in your favour. More often than not, on Facebook, they will.Do you use your Facebook author page as a marketing tool? Have you been discouraged by Facebook's "pay to play" change? Or do you pay to reach your audience? Leave us your thoughts in the comments below!

History and Development of the Kinetoscope

History and Development of the Kinetoscope The concept of moving images as entertainment was not a new one by the latter part of the 19th century. Magic lanterns and other devices had been employed in popular entertainment for generations. Magic lanterns used glass slides with images which were projected. The use of levers and other contrivances allowed these images to  move. Another mechanism called a Phenakistiscope consisted of a disc with images of successive phases of movement on it, which could be spun to simulate movement. Edison and Eadweard Muybridges Zoopraxiscope Additionally, there was the Zoopraxiscope, developed by photographer Eadweard Muybridge in 1879, which projected a series of images in successive phases of movement. These images were obtained through the use of multiple cameras. However, the invention of a camera in the Edison laboratories capable of recording successive images in a single camera was a more practical, cost-effective breakthrough that influenced all subsequent motion picture devices. While there has been speculation that Edisons interest in motion pictures began before 1888, the visit of Muybridge to the inventors laboratory in West Orange in February of that year certainly stimulated Edisons resolve to invent a motion picture camera. Muybridge proposed that they collaborate and combine the Zoopraxiscope with the Edison phonograph. Although apparently intrigued, Edison decided not to participate in such a partnership, perhaps realizing that the Zoopraxiscope was not a very practical or efficient way of recording motion. Patent Caveat for the Kinetoscope In an attempt to protect his future inventions, Edison filed a caveat with the patent office on October 17, 1888  that described his ideas for a device which would do for the eye what the phonograph does for the ear record and reproduce objects in motion. Edison called the invention a Kinetoscope, using the Greek words kineto meaning movement and scopos meaning to watch. Who Did the Inventing? Edisons assistant, William Kennedy Laurie Dickson, was given the task of inventing the device in June 1889, possibly because of his background as a photographer. Charles Brown was made Dicksons assistant. There has been some debate  over how much Edison himself contributed to the invention of the motion picture camera. While Edison seems to have conceived the idea and initiated the experiments, Dickson apparently performed the bulk of the experimentation, leading most modern scholars to assign Dickson with the major credit for turning the concept into a practical reality. The Edison laboratory, though, worked as a collaborative organization. Laboratory assistants were assigned to work on many projects while Edison supervised  and participated to varying degrees. Ultimately, Edison made the important decisions and, as the Wizard of West Orange, took sole credit for the products of his laboratory. The initial experiments on the Kinetograph (the camera used to create film for the Kinetoscope) were based on Edisons conception of the phonograph cylinder. Tiny photographic images were affixed in sequence to a cylinder  with the idea that, when the cylinder was rotated, the illusion of motion would be reproduced via reflected light. This ultimately proved to be impractical. Development of Celluloid Film The work of others in the field soon prompted Edison and his staff to move in a different direction. In Europe, Edison had met French physiologist Étienne-Jules Marey who used a continuous roll of film in his Chronophotographe to produce a sequence of still images, but the lack of film rolls of sufficient length and durability for use in a motion picture device delayed the inventive process. This dilemma was aided when John Carbutt developed emulsion-coated celluloid film sheets, which began to be used in the Edison experiments. The Eastman Company later produced its  own celluloid film, which Dickson soon bought in large quantities. By 1890, Dickson was joined by new assistant William Heise and the two began to develop a machine that exposed a strip of film in a horizontal-feed mechanism. Prototype Kinetoscope Demonstrated A prototype for the Kinetoscope was finally shown at a convention of the National Federation of Womens Clubs on May 20, 1891. The device was both a camera and a peep-hole viewer that used 18mm wide film. According to David Robinson, who describes the Kinetoscope in his book, From Peep Show to Palace: The Birth of American Film the film ran horizontally between two spools, at continuous speed. A rapidly moving shutter gave intermittent exposures when the apparatus was used as a camera and intermittent glimpses of the positive print when it was used as a viewer, when the spectator looked through the same aperture that housed the camera lens. Patents for Kinetograph and Kinetoscope A patent for the Kinetograph (the camera) and the Kinetoscope (the viewer) was filed on August 24, 1891. In this patent, the width of the film was specified as 35mm  and allowance was made for the possible use of a cylinder. Kinetoscope Completed The Kinetoscope was apparently completed by 1892.  Robinson also writes: It consisted of an upright wooden cabinet, 18 in. x 27 in. x 4 ft. high, with a peephole with magnifying lenses in the top...Inside the box, the film, in a continuous band of approximately 50 feet, was arranged around a series of spools. A large, electrically driven sprocket wheel at the top of the box engaged corresponding sprocket holes punched in the edges of the film, which was thus drawn under the lens at a continuous rate. Beneath the film was an electric lamp and between the lamp and the film a revolving shutter with a narrow slit. As each frame passed under the lens, the shutter permitted a flash of light so brief that the frame appeared to be frozen. This rapid series of apparently still frames appeared, thanks to the persistence of vision phenomenon, as a moving image. At this point, the horizontal-feed system had been changed to one in which the film was fed vertically. The viewer would look into a peep-hole at the top of the cabinet in order to see the image move. The first public demonstration of the Kinetoscope was held at the Brooklyn Institute of Arts and Sciences on May 9, 1893.

Explain why and how firms become multinational enterprises Essay

Explain why and how firms become multinational enterprises - Essay Example re than one country and so linked that they may co-ordinate their operations in various ways† (OECDS, 2008, p.12) It is the most common way among several by which foreign direct investments are transmitted outward by the home country, or invested inward into the host country. At times multinational firms are described in terms of equity proportion; some jurisdictions peg a multinational as one whose voting rights are 10% owned and controlled by a foreign entity; other dispensations say 50%. The OECD definition is thus an interesting one in that it specified no ownership proportion, but stresses the operational link among internationally engaged organizations in different countries. These internationally engaged firms are systematically different from those domestically oriented; they are as a rule larger and have a more complex organizational structure and processes. Multinationals are thus more complex to manage (Yeaple, 2009). A multinational enterprise (MNE) is, simply put, a business organization the operations of which spans different countries and is intricately linked to its subsidiaries or other subsidiaries of the same mother firm. Therefore, what then makes a firm into an MNE is the nature of its activities, that its activities are geographically expanded across borders under a common ownership. There are times when a stage of the firm’s operations is intended to be performed in another country, for any number of reasons such as greater cost-effectiveness or locating closer to raw material or human resources. But rather than outsourcing that stage of operations to another, domestic, firm, the company instead sets up its own subsidiary or unit in that country to perform that stage of the operations. There are several ways how a company can internationalize its operations: In all these methods, a substantial amount of long-term funds is committed in the productive activity, which infusion is called the foreign direct investment, or FDI. Forms

Healthcare Utilization and Finance Essay Example | Topics and Well Written Essays - 1000 words

Healthcare Utilization and Finance - Essay Example Medicare Part B Essentially, this part covers healthcare services that are not provided for in part A of the Medicare. In Mrs. Zwick’s case, the cost of the different diagnostic tests that she underwent during her hospital stay and time of rehabilitation would be paid for in this part. Medicare Part D This last option of insurance cover deals with payment of the cost of drugs that are prescribed during a hospital stay. The antibiotics that were prescribed during the initial hospital stay will be catered for here. Moreover, the medication that prescribed upon her discharge will be also paid and by extension the walker that she required to walk around. Medicare policies and Reimbursement of Additional Care The policy by Medicare not to pay additional costs emanating from hospital acquired infections means that these cases have to be HAC (hospital-acquired complications) in terms of high cost. This in turn means that a patient with such a problem would have to be assigned to paym ent of higher premiums to cover the whole cost. It is however predicated upon the premise that the complication was due to secondary diagnosis and could have been prevented through utilization of evidence based guidelines. These additional policies of Medicare on hospital acquired infections means that the hospital will not get reimbursement for them (McNair, Luft, & Bindman, 2009). For instance, the antibiotics that were prescribed to her and these drugs were for urinary tract infection (UTI). With UTI being one of the complications that are not catered for by Medicare, then Mrs. Zwick and her daughter would have to pay from their pockets. Ethical Implications for Incurring Costs Related To Her Hospital-Acquired Condition The ethical implication for costs that emanate from hospital acquired infections to the concerned patients is that they have to pay for the additional cost. This is regardless of whether the infection was due to negligence on the part of the hospital or the infect ion just arose spontaneously. In order for clients to be shielded from this, they are forced to pay more so that in the advent that the complications that occur due to a person being hospitalized may be reimbursed by Medicare. Such a proactive move is quite unfair to the payer and the extra charge is quite punitive bearing in mind that these infections are completely out of a payer’s control when they happen. Another ethical implication is that it has to be proved beyond doubt that the hospital acquired infections were not due to negligence on the part of a hospital. This may arduous and quite challenging and it takes time (Zhan, Friedman, Mosso & Pronovost, 2006). Scenario 2 Consolidated Omnibus Budget Reconciliation Act (COBRA) Since COBRA insurance was designed to cover for people who have lost their job due to legitimate reasons, the cover is usually paid by the former employer but it is not subsidized. It follows then that the payments for health coverage premiums are re mitted by the former employer in full and an additional administrative cost of two percent. However, coverage is considered under group coverage which therefore means that the cost of the premiums is still low although they are slightly higher than when the employee was working. Many of the individuals that invoke the COBRA coverage usually have a big time difference between their last day at work and

Gun control Research Paper Example | Topics and Well Written Essays - 1250 words

Gun control - Research Paper Example tance, Arne Duncan, the US secretary of education recently posted on twitter complaining that it is disturbing to admit the fact that many students will have lost their lives before authorities respond with lucrative measures to control gun-related violence in schools. Additionally, in a recent press statement, Obama stated that America should be ashamed of its failure to impose tough gun possession restriction laws. Carter (2006, pp 25), states that some states have legalized gun possession by students and this has posed a challenge in the fight against gun violence in learning institutions. Research has showed that authorities are not fully dedicated to handle illegal gun possession cases. For example, in 2010 a statute was passed in Nebraska State suggesting that legal gun owners to report cases of missing firearms to the local authorities but not underpinned by the federal laws. Gun laws in the United States require abrupt amendment in order to control gun-related violence and en hance peaceful relations among members of the public. Some people argue that gun-related violence is fuelled by both weak laws and the irresponsible character of people in possession of guns. For instance, Possession of guns by minors in learning institutions shows that the existing gun control regulations are weak and defective. Actually, the rise of gun-related violence in learning institutions across America can be ascribed to uncontrolled possession of guns by minors. It is estimated that gun shooting per school week amount to about 1.4 and at least 74 shooting have happened in schools since the 2012 shooting in Newtown. Federal or state laws are not the sole contributors to the increased gun violence in US. Irresponsibility of senior members of the community, especially those with legal rights to own guns, has also contributed to increased shooting incidents. For instance, after investigation of the Newtown shooting, the gun used by the culprit was found to belong to his 52-year