Bio Cement Essay Example for Free

Bio Cement Essay The project aims at attaining high durability of concrete and gaining high strength of cement. We plan to make use of bacterial species which can hydrolyze the enzyme Urease efficiently to produce microbial concrete. Such bacterial are known to produce calcium which is useful in giving strength to cement. We are working in 2 stages. Stage 1: Here we check the effect of bacterial solution on cement mortar and along with that we check the effectiveness of the bacterial solution to fill the cracks in concrete by precipitation of calcium in the cracks. Stage 2: To prepare concrete using the cement and solution (bacterial) in optimum ratio and checking its effectiveness from strength and durability perspective. Till now Stage 1 is partially over: We have made use of this bacterial solution(Emulsion: Bacillus culture+ nutrient broth+ sucrose+ urea+ calcium chloride+ antifungal agent(griseofulvin)to heal the existing cracks in the concrete walls. For achieving high 7 days we have made use of bacterial solution in some fixed proportion with water. The 7 days test was performed on 7/12/11 with 5%, 10%, and 15% of the bacterial solution with respective percentage of water. We have gained a significant percentage increase in the strength of the cubes made with bacterial solution with water versus those made with only water Bacteria at work Microbially induced calcite precipitation (MICP) Microbially induced calcite precipitation (MICP) is known to be a natural phenomenon associated with a wide range of bacterial species such as Bacillus spp. provided the right conditions, namely, an alkaline environment rich in Ca2+ ions. Bacterially induced mineralization has recently emerged as a method for protecting and consolidating decayed construct materials. Calcite (CaCO3) is one of the most common and widespread minerals on the earth, constituting 4% by weight of the earth’s crust. Calcite precipitation is a common phenomenon which forms natural rock and exists in environments such as marine water, fresh water, and soils. Microbial calcite precipitation can be induced by organisms involved in the nitrogen cycle, via the hydrolysis of urea by enzyme urease, which results in the production of carbonate ions in the presence of ammonium. Calcium carbonate is readily precipitated under these conditions, in the presence of calcium. Microbial calcite precipitation comprises a series of complex biochemical reactions. During microbial urease activity, 1 mol of urea is hydrolyzed intracellularly to 1 mol of ammonia and 1 mol of carbonate, which spontaneously hydrolyzes to form additional 1 mol of ammonia and carbonic acid. Subsequently, these products equilibrate in water to form bicarbonate, 1 mol of ammonium and hydroxide ions which give rise to a pH increase and ions Ca2+ and CO32- present in the surrounding precipitate as CaCO3. Urea hydrolysis is the most easily controlled of the carbonate generating reactions, with the potential to produce high concentrations of carbonate within a short time. Bacillus spp. was used in this study. The culture was grown in Nutrient broth-urea (NBU) medium containing peptone, sodium chloride, yeast extract, 2% urea and 25mM calcium chloride and incubated at room temperature on shaker condition (130 rpm). Calcium chloride acts as the source of calcium ions and urea as the source of carbonate ions. Observations * There is a rise in the compressive strength of the mortar cubes till 5 % bacterial solution. * The strength is reduced when the proportion of bacterial solution is increased up to 10 % and beyond. * The cubes with 15% bacterial solution shows 8 % decrease in strength. * The 1%, 2%, 3% cubes developed less cracks in comparison to control cubes. * The cubes when observed after testing , the control cubes had more number of empty pores. Conclusion * 3% cubes showed an increase in compressive strength of 36 % in comparison to control cubes. * Reduction in empty pore space.(which prevent the ingress of water and other chemicals ) * Bacteria does not have any physical effect on the cement. * Chemically inert. * Bacterial solution can be prepared on a large scale . * No skilled labour is required. * Its production is economical. References * Microbial activity on the microstructure of bacteria modified mortar by S.Ghosh, M.Biswas, B.D. Chattopadhyay, S.Mandal. * Effect of calcifying bacteria on permeation properties of concrete structures by Dr. Varenyam Achal. * Work on BacillaFilla by New Castle University.

Absolute Truth :: essays research papers

The question of right and wrong has been battled over for centuries. Many conservatives still believe that truth is absolute, while others disagree, saying that truth is relative. I believe that truth is absolute, and therefore, it is never right to do wrong. Socrates is questionably the greatest philosopher of all time. He preached out against immorality and many other evils. He spent his whole life teaching other people how to be good and moral. In the â€Å"Crito† he is imprisoned and awaiting his death sentence for misleading the youth, of which he has been wrongly accused. Crito, his friend, comes to visit him in jail and they have a long conversation, which is the â€Å"Crito.† Socrates and his friend could have fairly easily broken out of the prison, because many of the guards looked up to Socrates and didn’t wish to see him killed. Socrates made the point that if he were to leave jail, he would be breaking the law. Even though he had been wrongly accused and sentenced to death for no reason, he couldn’t go against his own teachings, or else his whole life would have been in vain. He knew that if he didn’t escape, he would die and would orphan his two children, however no matter how much he loved Steve Weber-2 them, he wouldn’t contradict his teaching by doing wrong. Even though Socrates wasn’t perfect, he would always make a conscious effort to do right. Breaking out of jail would be blatantly wrong, and he couldn’t bring himself to do it. Adolf Hitler is directly and indirectly responsible for more deaths than almost anyone in history. Over six million Jews alone were killed because of his death camps. In The Plot to Kill Hitler, a group of German officers and many others formed an underground society to try and kill Hitler. Most people would agree that what they were doing was okay because Hitler was such a bad man. Unfortunately, they were wrong. Murder is always wrong, no matter who is being killed. Right and wrong can not be distinguished through society’s perspective. Society tends to look at everything relative to it’s situation. When determining right and wrong we have to look to the absolute truth, not our personal feelings. Committing certain â€Å"wrong’s† may be accepted by society more than other wrong’s. If someone were to kill the President, people would be outraged and demand justice, but if someone were to kill a homeless person, many people could shrug it off with ou t so much as batting an eye.

Hasty Generalisation

Hasty generalization (Anecdotal) Definition: Making assumptions about a whole group or range of cases based on a sample that is inadequate (usually because it is atypical or just too small). Stereotypes about people (â€Å"librarians are shy and smart,† â€Å"wealthy people are snobs,† etc. ) are a common example of the principle underlying hasty generalization. Example: â€Å"My roommate said her philosophy class was hard, and the one I'm in is hard, too. All philosophy classes must be hard! † Two people's experiences are, in this case, not enough on which to base a conclusion. The person committing the fallacy is misusing the following type of reasoning, which is known variously as Inductive Generalization, Generalization, and Statistical Generalization: 1. X% of all observed A's are B†s. 2. Therefore X% of all A's are Bs. The fallacy is committed when not enough A's are observed to warrant the conclusion. If enough A's are observed then the reasoning is not fallacious. Tip: Ask yourself what kind of â€Å"sample† you're using: Are you relying on the opinions or experiences of just a few people, or your own experience in just a few situations? If so, consider whether you need more evidence, or perhaps a less sweeping conclusion. (Notice that in the example, the more modest conclusion â€Å"Some philosophy classes are hard for some students† would not be a hasty generalization. ) Here are some more examples of hasty generalisations fallacies. See if you can identify the fallacy and write this in the following format â€Å"A means B. † We will then discuss what is wrong with each one: 1. Bill: â€Å"You know, those feminists all hate men. † Joe: â€Å"Really? † Bill: â€Å"Yeah. I was in my philosophy class the other day and that Rachel chick gave a presentation. † Joe: â€Å"Which Rachel? † Bill: â€Å"You know her. She's the one that runs that feminist group over at the Women's Center. She said that men are all sexist pigs. I asked her why she believed this and she said that her last few boyfriends were real sexist pigs. † Joe: â€Å"That doesn't sound like a good reason to believe that all of us are pigs. † Bill: â€Å"That was what I said. † Joe: â€Å"What did she say? † Bill: â€Å"She said that she had seen enough of men to know we are all pigs. She obviously hates all men. † Joe: â€Å"So you think all feminists are like her? † Bill: â€Å"Sure. They all hate men. † 2. â€Å"Our English teacher made us ready read some poetry last year, and it was really boring. I know now that I will never like poetry† 3. Fred the Australian, stole my wallet. Thus, all Australians are thieves. 4. I asked six of my friends what they thought of the new taxes and they agreed that they are a good idea. The new taxes are therefore generally popular. 5. All swans are white. 6. Critical thinking is not part of my university application therefore Critical Thinking has no value After the discussion write 2 or 3 examples of ad hominem/tu qouque’s of your own. India is the country with the largest population therefore Indian people love to have sex Han Eol is good at badminton therefore all Koreans are good at badminton The Virginia Tech Massacre was done by a Korean, therefore all Koreans are terrorists James Koay gets good grades therefore all Asians are smart Blondes are dumb therefore Carrie Sharp is dumb

Case Study Managing for Organizational Integrity

[pic] [pic] [pic] SUBMITTED BY: PARSHU RAM ACHARYA MOUNT DRUITT TAFE INTRODUCTION The aim/purpose of this report is to discuss how the information systems are managed systematically in an organizational operation. How those frontline managers should be competent in managing the systems, developing business plans and budgets as well as managing the resource proposal are made are researched in sources listed in the Bibliography and the practicable application of it in business as demonstrated by the case study of Blacktown city council which is followed by the theory of manage workplace information systems with the help of class notes and further researched on†¦show more content†¦It also includes the facilities like the basics of life including the leisure and lifestyle, arts and entertainment like libraries, parks, reserves, child care centres, clubs etc. The nature of work involves governing all the people living in Blacktown as a local government and providing each and every facilities that a local government should provide and is capable of. It includes the managing waste ,cleaning the public places, constructing the parks, reserves, clubs , child care centres and repairing of all those and lots of other projects. The aim and objectives of Blacktown city council can be briefly explained as below: 1. To serve a whole Blacktown community as a parent organisation. 2. To provide each and every facilities for the diverse and dense multicultural community. 3. Carry out different planned project and implementing it for the development of Blacktown city and its welfare. 4. To workout for the different ways that can satisfies the local people and maintains the social harmony, peace, etc. 5. To provide safe environment for people in working and enjoying freely. 6. Safeguarding the people needs and necessities and maintain secure place to live in. The project is on the Blacktown City council, Department of planning Engineering Team’s proposal of the ‘promotion of solar city products’Show MoreRelatedAlcoas Case923 Words   |  4 PagesAlcoa’s Case Study 2 1. How would you classify Alcoa’s ethical climate? Which ethical criterion, as shown in figure 5.1., was used by the company: egoism (self-centered), benevolence (concern for others) or principles (integrity approach)? Or, using Professor Paine’s two distinct ethics approaches, as discussed in this chapter, was Alcoa’s approach more compliance or integrity? Alcoa since its inception had a very strong values and the people itself enforce these values, all the employees knewRead MoreImproving Ethical Behavior Is An Important Area Where Better Understanding Of Organization Behavior817 Words   |  4 Pages Improving ethical behavior is an important area where better understanding of organization behavior helps managers to train employees and tackle the ethical implications well. 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