Understanding Behavior Essays - Mundo Moy Akin,

Understanding Behavior The behavior of a person can usually be explained by that person's state of mind. The external conduct is almost always directly linked to internal emotions. Knowing this fact is very beneficial to someone like a guidance counsellor because it lets him or her almost "read" the physchlogical state of a student based entirely on their behavior. In Darlene's case her behavior has been very well documented making the task of phsycological assesment a much easier job. There are many facets to Dralene's behavior, each revealing a different part of her state of mind. Judging from the way she dresses and is groomed it appears as if she comes from a family less wealthy than most of the other children at her school. This has probably been a factor in her sullen behavior. Because she can't afford more expensive clothes, she has been put into a different social class than most of her peers. It is known that all humans have an emotional need to be "accepted" by their peers but unfortunat for Darlene, being accepted is a need that she has not satisfied due to her lack of wealth. Darlene also expressed that this form "classism" against her was apparent at sunday school. It was so great in fact that she actually quit the classes to get away from the sunday school "snobs". It should come as no surprise that Darlene has also expressed a desire to quit highschool as well. This may also explain her reluctance to join any clubs and the way she anticipates unfriendly reactions from people she meets. Darlene's teachers agree that although Darlene has an above average intellect, she still only aquires average marks. I believe this problem can be traced to her parents. It si known that Darlene's parents keep Darlene in 6 days of the week, and when they do let her out she must be home at ten. It is also known that Darlene must do alot of housework on the weekends if she wants to get her weekly allowance and that her parents do not approve of her friends. Darlene's poor pe nce in school may very well be Darlene's way of "getting back" at her parents. By getting average marks she is trying to tell her parents that keeping her in and being so restrictive of her social activities won't help her school work, it will only make it worst. I will assume that Darlene also feels like her parents don't pay enough attention to her. Both her parents probably work, explaining why Darlene has so many responsibilities at home, and neither of them likely have much time to spend with their daughter. Darlene would also like more freedom to do go out and choose friends. The physological needs Darlene lacks are social acceptance, attention from her parents and freedom. If I were to advise Darlene on a course of action it would be to discuss the problem with her parents and not to try and hurt them by doing poorly in school because that is not hurting her parents, it is only hurting her. I would tell her that the only person in the world Darlene can change is herself. I would also tell Darlene that any peer that does not like her based solely on how much money she has is not worth having as a friend. I would tell her to ignore people who treat her badly becuase of her lack of wealth and eventually they will stop annoying her because they will not get any reaction from her. Darlene will have to work on her attitude though, so she can be more sociable and more accepted.

Legalization of Narcotics essays

Legalization of Narcotics essays Narcotics, or drugs, are substances that affect the bodys functions. They can stimulate the mind, make people depressed, or make them hyper. Marijuana, heroin, LSD, PCP, cocaine, and anabolic steroids are all considered narcotics. Narcotics are illegal in the U.S. Even though drugs are illegal, about 12 million people use them anyway. Many strict laws have been passed against drugs but they seem to have little affect. People still decide to sell or use drugs for recreational purpose. This is why narcotics should be legalized. Before 1914, it was legal to make, sell, or use any type of drugs. Many of the drugs were used for medicinal use. This was before people found out how addictive and harmful drugs were. The Pure Food and Drug Act of 1906 required medicine labels to show whether over the counter drugs contained narcotics. After the act was passed, many Americans did not buy medicine that contained narcotics. The Harrison Narcotics Act of 1914 made narcotics illegal except for medicinal purpose. On 1919 the Supreme Court changed the Harrison Narcotics Act. They made it illegal for doctors to prescribe narcotic drugs to addicts. The Controlled Substance Act was created in 1970. The CSA turned fifty-five drug laws into one big one. This act sets the minimum penalties for the use or distribution of narcotics. State and local governments can make the drug laws stricter, but have to follow the minimal guidelines set by the CSA. The CSA divides narcotics into five categories called schedules. Schedule I drugs are only allowed for controlled experimentation. They have the highest potential for abuse. These drugs are: heroin, LSD, marijuana, and Ecstasy. Schedule II drugs are also restricted, but can be prescribed by doctors under special circumstances. These drugs are cocaine and PCP. Schedule III drugs have medical use, but can be abused. These are mostly painkillers and barbiturates such as codeine ...

Subject Complement Definition and Examples

Subject Complement Definition and Examples A subject complement is a word or phrase (usually an adjective phrase, noun phrase, or pronoun) that follows a linking verb and describes or renames the subject of the sentence. Also called a subjective complement. In traditional grammar, a subject complement is usually identified as either a predicate nominative or a predicate adjective. Examples and Observations The light in the chapel was warm and soft.Mrs. Rigney was my fourth-grade teacher.My fourth-grade teacher was exceptionally kind.Ruth and Thelma are my best friends, and their roomies are Tammy Hinsen and Rebecca Bogner. (Dean Koontz, Lightning. G.P. Putnams Sons, 1988)I knelt down and pulled on the edge of the stone with him, and it started to move with the sucking sound of thick mud. It smelled awful, and we looked at each other with sour faces. (Patrick Carman, The Land of Elyon: Into the Mist. Scholastic Press, 2007)The Johnson children and Harbor Branch received $169 million. But if they were the true winners, no one was the loser. (Barbara Goldsmith, Johnson V. Johnson. Knopf, 1987)The very air was alive with the uncanny cries of phantoms that flew through the secret places of this region. These mountains were unfriendly at the best of times. (David Bilsborough, The Wanderers Tale. Tor, 2007) Linking Verbs and Subject Complements If a verb requires a subject complement (SC) to complete the sentence, the verb is a linking verb. The subject complement ([italicized] in the examples that follow) typically identifies or characterizes the person or thing denoted by the subject: (1) Sandra is my mothers name.(2) Your room must be the one next to mine.(3) The upstairs tenant seemed a reliable person.(4) A university is a community of scholars.(5) The receptionist seemed very tired.(6) You should be more careful.(7) The distinction became ​quite clear.(8) The corridor is too narrow. The most common linking verb is  be. Other common linking verbs (with examples of subject complements in parentheses) include appear (the best plan), become (my neighbor), seem (obvious), feel (foolish), get (ready), look (cheerful), sound (strange). Subject complements are typically noun phrases, as in (1)-(4) above, or adjective phrases, as in (5)-(8) above. (Gerald C. Nelson and Sidney Greenbaum, An Introduction to English Grammar, 3rd ed. Routledge, 2009) The Difference Between a Subject Complement and an Object The Subject Complement is the obligatory constituent which follows a copular verb and which cannot be made the subject in a passive clause: Whos there? Its me / Its I.*She became a tennis champion at a very early age.Feel free to ask questions! The Subject Complement does not represent a new participant, as an Object does, but completes the predicate by adding information about the subject referent. For this reason, the Subject Complement differs from the Object in that it can be realized not only by a nominal group but also by an adjectival group (Adj.G), as illustrated in the previous examples. The objective case (me) is now in general use (Its me) except in the most formal registers, in which the subjective form (Its I) or (I am he/she) are heard, especially in AmE. As well as be and seem, a wide range of verbs can be used to link the subject to its Complement; these add meanings of transition (become, get, go, grow, turn) and of perception (sound, smell, look) among others... (Angela Downing and Philip Locke, English Grammar: A University Course, 2nd ed. Routledge, 2006) Agreement with Subject Complements (16c) These are the costs the grey parties never talk about when they allow the system to go on. (w2b-013:097) . . .(16h) I call them wild flowers. . . .(s1a-036:205) In those cases in which the complements are noun phrases, the subject complement shows concord with the subject S, and the object complement is in concord with the direct object, as can be best seen in the examples (16c) and (16h). (Rolf Kreyer, Introduction to English Syntax. Peter Lang, 2010) Semantic Relations The italicized portions of the following examples are Subject Complements. The upper case labels to the right indicate the semantic relation between the Subject Complement and the Subject: (4a) The venue for the meeting is the Roxburghe Hotel. EQUATION(4b) The estate car is a Volvo. PROPER INCLUSION(4c) Youre so young. ATTRIBUTION(4d) Would you still love me if I were old and saggy? ATTRIBUTION(4e) that telly was mine POSSESSION(4f) Sometimes were on a collision course, LOCATION(4g) the NHS was for all of us BENEFACTEE(4h) The five pound note was for services rendered. IN EXCHANGE The Inflection (marking for tense, aspect, mode, and agreement) in this type of construction is carried by be; therefore be is the syntactic Head of the Predicate. However, the Subject Complement is the element that expresses the main semantic content of the Predicate. In other words, the Complement is the semantic Head of the Predicate. Source Thomas E. Payne, Understanding English Grammar: A Linguistic Introduction. Cambridge University Press, 2011

Key Technology Trends That Raise Ethical Issues Research Paper

Key Technology Trends That Raise Ethical Issues - Research Paper Example This paper presents an overview of ethical concerns that are caused by the information technology. The information technology brings about a number of ethical, social, and political issues. Additionally, ethical issues consist of both political and social issues. For instance, at present, customer service has turned out to be one of the most important organizational tasks or services which engender a large number of ethical challenges and issues. In many cases, the lack of education and training in the subject of internet use has made a large number of individuals to take part in activities that question their ethics. This paper will present an overview of key technology trends that raise various ethical issues. Basically, ethics is a set of rules and principles that tell the individual whether they are wrong or right, acting as free of charge ethical agents, from which people draw guidance while making decisions to direct their actions and behaviors. Without a doubt, the information technology (IT) has brought wonderful advantages and opportunities to business organizations as well as individuals. It has modernized and revolutionized all the fields of life. However, at the same time it has caused a wide variety of ethical issues for individuals, business organizations and cultures for the reason that they open new horizons for strong societal change, and as a result intimidate offered distributions of authority, capital, privileges, and responsibilities. In addition, similar to any other technologies, for instance, electricity, steam engines, the telephone, fax machine and the radio, information technology can be utilized to accomplish social development; on the other hand, it can also be used by the bad people to carry out illegal activities. For instance, they can use it to threaten cherished social values and commit crimes. In this scenario, the advancements in information technology will create advantages and opportunities for a large number of businesses and individuals as well as expenses for others. In addition, information technology has given a great deal more pressure to ethical issues through the developments in the Internet, electronic commerce (e-Commerce) and electronic business (e-Business). It is an admitted fact that the Internet and other similar digital technologies make it easier for the bad people to bring together, integrate, and dispense their criminal activities. Some of the cases that can cause various ethical issues and concerns can include misuse of data and information, giving a free rein to new concerns regarding the suitable utilization of customers’ information, the security of individual privacy, and the protection of intellectual property and rights. Sometimes, the staff members of an organization having extraordinary skills and knowledge can deceive IT resources and business systems by using fake information and records and redirecting money at a level unbelievable in the pre-computer age. Some of the other well-known and vital ethical concerns caused by the increasing use of information technology comprise setting up responsibility for the costs of information technology and business management systems, establishing standards and measures to ensure the security of systems’ quality that ensures the security and privacy of society and individuals, and maintaining values and foundations believed to be critical to the quality of life in an information culture.

Intermodal Transportation Essay Example | Topics and Well Written Essays - 500 words

Intermodal Transportation - Essay Example At the individual level, Americans spend all the more on transportation, cargo development, and driving, than they do on garments, working the family, diversion and intercity travel set up together. Transportation expenses represent 11 for each penny of extra cash, the fourth biggest thing in family spending plans (USDOT 1999b). Utilizing 1994 gross national item numbers, cargo transportation made up 6.3% for each penny of aggregate consumption, which could go up to 10–11 for every penny of aggregate use if incomes spent on stock, warehousing, and logistics administrations are incorporated (ENO 1998). As a rate of aggregate consumption, freight transportation accounts 38.52% for every penny of the aggregate while passenger transportation represents the rest (USDOT 1999b). The effect of cargo on the US economy is significant. Generally speaking, it is evaluated that most of the country’s revenue is generated from freight transportation. The author investigates the immense challenge of expanding the extent of intermodal freight transport. In perspective of the present overwhelming role played by road transport and the expanding impediments in adapting to an increase in the number of vehicles in a productive and reasonable way, multi-purpose freight transport could be viewed as a practical option. In any case, he makes acknowledgment of the way of there is the need to enhance the performance of the intermodal transport framework. The role played by the government in cultivating intermodal transport advancements has been highlighted by Holguin-Veras et al. (2008). Concentrating on the American cargo transport framework different authors distinguish diverse arrangements of elements that clarify the diverse range of factors that the government experiences in cultivating advancements: Incompatible goals and objectives of the private and open area, absence of

Causes of Brick Deterioration and Decay in Buildings

Causes of Brick Deterioration and Decay in Buildings Introduction Most parts of the building are built from the brick. Nowadays, the brickwork defects ware commonly founded in building. The problem was getting more serious and serious. Seriously of the brickwork defects may cause a lot of problems to the occupants. The main problem encountered in building with a traditional outside bearing wall of brickwork and concrete inside bearing structure is caused by differences in the temperature and moisture-induced movement. Crack maybe be discovered in walls and solutions have to be found. (L.G.W.Verhoef, 2001) Brickwork defect occurs in building has a variety of reasons. This is perhaps not surprising when one considers the wide range of differences bricks and technique in construction of building, differences in the construction sites and the varied occupational or owner used of the completed building. Brickwork will deteriorate and decay if not properly maintained. Such deterioration can be caused by a number of factors and can take various forms. The main signs that brickwork is suffering are surface growth and staining, efflorescence, loosed brick becoming dislodged, crack appears throw the bricks or mortar and etc (Moses Jenkins, 2007). In this sub chapter, the different types of the brickwork defect will be determined. This chapter gave an overview of various types of the brickwork defects and understanding the brickwork defects. To identify the different types of the brickwork defects will make easily for the occupants or owners to find out the causes of the defects and take the suitable remedies method in the right way. Define bricks Brick is the materials that commonly use to build the buildings wall. Clay bricks are the most common brick type. It is made from the sand and clay and uniformly burnt at temperatures between 800 °C and 1200 °C. Surface finishes are sometimes applied e.g. glazed bricks. Glazed bricks are still being produced in quantity and can be obtained from a major English brick manufacturer and supplier. Calcium Silicate bricks is manufactured from sand-lime (calcium silicate). The bricks are pressed under great pressure and steamed in an autoclave. The bricks are smooth, fine textured and light in colour. The brick colour is produced from material source, composition and firing temperature. The size of bricks over time has changed considerably. Some early medieval bricks were 13 inches by 6 inches by 2 inches. By the late 15th century a brick 9.5 inches by 4.5 inches by 2 inches became the norm and a charter in 1571 stipulated 9 inches by 4.5 inches by 2.25 inches. By the 18th century, 8.25 inches by 4 inches by 2.5 inches brick was introduced. Modern bricks are 8.5 inches by 4 inches by 2.5 inches which following metrication translated to 215mm by 102.5mm by 65mm. Modern bricks is the brick that most of the building using in nowadays. Defect of size Oversized bricks are caused by poor material selection and preparation or underfiring. Under size bricks are caused mainly by poor material preparation, faulty moulds and overfiring. Defect of shape The causes of these defects are many. These are including poor preparation of moulds or moulding technique, faults in stacking, rough handling and uneven drying. If the bricks are considerably over burnt, incipient fusion takes place and the bricks, called burrs, come out of the kiln or clamp stuck together. Burrs are suitable only for hardcore purposes. Defects of body Faults in the raw material body can give rise to defects such as cracking, bloating and laminations. Cracking and warping of bricks, causing incipient weakness, maybe due to exposure of green bricks to direct sunlight or rapid drying winds. Similar effects will be produced by putting green bricks into the kiln too soon. Large cracks maybe caused by rain getting onto hot bricks. Defect of Appearance These defects are caused primarily by faulty wires in the case of wire-cut bricks. Dark spots are caused by the presence of unevenly distributed iron sulphide in the clay. Brick wall settlement Any movement in a structural  brick wall which risks having broken the bond courses in the wall, and any movement in a  brick veneer wall which has broken or loosened the connections between the veneers to the underlying structure are potentially dangerous and risk collapsing masonry. Bulging brick wall This is likely to be a bond-brick or bond-course failure. This defect is potentially extremely dangerous and must be very urgent to take action. If not, it can causes the building suddenly collapse. Cracks and Bulges in brick walls Frost and earth loading can push a below-grade brick foundation wall inwards. The wall is often bulged inwards as well as showing horizontal and step cracking and loose bricks over the bulged area. The damage occurs from slightly above ground level to roughly the frost line. Cracks and loose bricks Normally, crack and loose bricks are cause by frost, settlement, expansion, diagonal and stair-stepped. Those defects often happen at building corners where roof spillage is concentrated. Loose bricks and missing or lost mortar This is the movement where mortar is severely washed-out by roof spillage or other water movement against the foundation. Loose and lost bricks may also occur where wood blocks, originally set into a wall to permit nailing of interior components, is damaged by insects or decay. Similarly, if wood joists are damaged and bend excessively or collapse (insect damage, rot, fire) the collapsing joist can, as its in-wall end moves, damage the foundation or building wall. Fire cuts on wood joists in brick walls were intended to minimize this damage source by angling the end of the joist where it was set into the wall pocket. Sand-blasted bricks   Which have been cleaned of old paint, algae, or stains using high pressure sand blasting or possibly even very high pressure water blasting can be permanently damaged by loss of the harder surface of the bricks which had been provided by their original firing. Once the softer internal brick has been exposed, the bricks will be more inclined to absorb water and to suffer water and frost damage. Sandblasting brick is considered a poor practice in building renovation and maintenance. Spalling bricks Spalling is caused by water and frost, such as water leaking into a brick structure at any entry point: a crack, a brick which has lost its hard surface, or at openings by window and door penetrations. But beware about caulking brick. Exfoliating-rust damage to brick   Masonry wall occur these defects when brick walls have been improperly caulked where caulking should have been omitted. The most common example of this defect is the damage that occurs to a brick wall when a steel lintel over a window or door is caulked tightly between the brick and the steel. Moisture penetrating the brick wall through cracks or mortar joints is trapped around the steel lintel. Rust developing on steel lintels has tremendous lifting power as the rusting exfoliating metal expands, sufficient to crack and damage bricks around lintel. Improper repair mortar  on brickwork During repair work, tuck pointing bricks, or re-pointing bricks can cause surface spalling of bricks if the mason uses a too hard mortar with high portland content mortar on soft brick in a climate exposed to freezing weather. The high portland content means that the mortar will be not only harder, but more waterproof than the surrounding brick. Water trapped around the hard mortar can freeze leading to surface spalling of the bricks. This is particularly likely to be seen when a wall has been tuck pointed using hard high-portland mortar where originally a soft high-lime mortar was used and where the original bricks were soft. Salts on brickwork Salts are a major cause of deterioration. Salt can enter bricks through contaminated water ingress. In coastal areas salt can come from the sea and, in winter, the nearby application of road salt is a constant threat. Salt is damaging because it creates a steady expansion of crystals within the bricks. This can eventually force the structure of the brick apart. The source of salt can occur from within the bricks themselves or from the application of contaminated mortars or renders. Brick lined chimney flues are also vulnerable as sulphates can be introduced when flu gasses condense. This is a common defect where a chimney has been sealed without adequate ventilation. Efflorescence on brickwork Efflorescence appears as a white powdery deposit on the brick. It is a phenomenon that soluble slats dissolved in water are carried, deposited and gradually accumulated on brick surfaces to form an unsightly scum. Without water efflorescence cannot occur. The soluble salts may be originated from the raw material of bricks. But in most cases, efflorescence is caused by salts from the external sources such as ground water, contaminated atmosphere, mortar ingredients and other materials in contacts with the bricks. To minimize the risk (it can never be completely avoided in brickwork exposed to weathering) the building detail should be designed, as far as is possible, to avoid saturation. In other words good overhangs, copings and sills with drips all need to be considered. Efflorescence can be helped on its way by sponging down the wall with clean water (avoiding substantial wetting) or dry brushing with soft brushes. Any other treatment should be avoided as it may disfigure the bricks .   Frost Attack on brickwork Frost attack often occurs when very cold weather immediately follows a very wet spell. When porous materials become saturated and the temperature drops below freezing the formation of ice causes stresses which some bricks cannot be resist and cracking or spalling occurs. Clay bricks are classified as frost resistant, moderately frost resistant, and not frost resistant. Calcium silicate bricks are not generally at risk although it is wise to specify bricks with a compressive strength. Thermal movement on brickwork Every materials expand or contracts as the temperature of the material changes, typically expanding as its temperature increases and contracting as its temperature decreases. Different materials expand and contract at different rates when they undergo similar changes in their temperatures. Brick veneer can expand and contract approximately. When determine the expansion or contraction of a brick veneer, it is important to remember the effects of the sun on materials. The energy from the suns rays raises the temperature of a material well above the air temperature. On a day when the air temperature is 32 ° F, the energy from the sun can raise a walls temperature to above 100 ° F Thermal expansion failures in structural or veneer brick walls A separate factor that can cause very large movements and extensive damage to brick structures or brick veneer walls is the thermal expansion which occurs across a long or tall brick wall when that wall is heated by sun exposure. The photographs show significant thermal expansion damage in a long brick structure. Significant breaks and gaps  at vertical brick mortar joints due to thermal expansion and perhaps some frost and water damage. Photograph of thermal expansion damage to a brick wallFigure1: Significant breaks Horizontal sliding breaks  in brick mortar joints,  exposing reinforcing wire to rust, exfoliation, and additional damage from those forces as the exfoliating wire produced still more pressure on the mortar joint. Photograph of a collapsed brick strudctural wallFigure2: Horizontal breaks Step cracking  following mortar joints near the building corners and where the wall movement was resisted by first story intersecting brick walls abutting at right angles the middle section of the long brick wall. Photograph of thermal expansion damage to a brick wallFigure3: Step cracking Cracks and broken bricks at the intersections of brick walls and openings. Photograph of thermal expansion damage to a brick wallFigure 4: Cracks and broken bricks (InspectApedia, 2007) Moisture movement on brickwork Moisture affects all porous masonry materials, including brick, mortar and concrete masonry units but in very different ways. These effects must be considered when a combination of these materials is used, such as when brick rests on a concrete foundation, brick veneer units are used with block back up, and when brick and architectural concrete products are used in the same wythe bands of precast concrete or architectural concrete block in a brick veneer. After their initial mixing or casting, mortar, poured-in-place concrete and concrete masonry units shrink as the curing of the Portland cement proceeds. This is an unavoidable consequence of the curing of concrete products and is accommodated in design. Sulphate attack on brickwork Most ordinary clay bricks contain sulphates of sodium, magnesium or calcium. These salts are soluble in water in water, calcium sulphate being less soluble than the other two. Normally, these sulphates are seen as the harmless efflorescence which affect appearance only and need simply to be brushed away. In theory, most brick walls with mortars based on OPC (Ordinary Portland Cement) are liable to sulphate attack. The most vulnerable walls are earth-retaining walls and parapet walls but sulphate attack is a problem also on rendered, and on facing brickwork. On rendered brickwork, sulphate attack is manifested by cracking of the rendering, the cracks being mainly horizontal and corresponding to the mortar joints below. The rendering may adhere quite well to the bricks early in the attack but areas are likely to become detached as the expansion of the underlying brickwork causes severance of the bond between the two material. (H.J.Eldridge,B.Sc.1976) Lime staining on brickwork Lime staining occurs when calcium hydroxide is deposited on the face of brickwork. Lime staining will quickly absorbs carbon dioxide from the air and becomes calcium carbonate. It is virtually insoluble and can only be removed by expert and costly treatment. The calcium hydroxide can come from three main sources: calcium hydroxide caused by the hydration of Portland cement from hydrated lime added to mortar from brickwork in contact with wet concrete Porosity on brick Porosity is an important characteristic of brick. In contrast to other moulded or pre-cast building materials, the porosity of brick is attributed to its fine capillaries. By virtue of the capillary effect, the rate of moisture transport in the brick is ten times faster than in other building materials. Moisture is released during day-time and re-absorbed during night-time. The ability to release and re-absorb moisture by capillary effect is one of the most useful properties of brick that helps to regulate the temperature and humidity of atmosphere in a building. This distinctive property makes brick an admirable building material, particularly suitable for buildings in the tropics. On the other hand, all porous materials are susceptible to chemical attacks and liable to contamination from weathering agents like rain, running water and polluted air. Crack in brick faces/firecracks The finished appearance of clay brick can vary greatly, this is because dependant on clay and the manufacturing process. Some products contain cracks of varying degree (sometimes referred to as firecracks) as an inherent feature. Firecracks are usually visible on the product as delivered. However, firecracks can be masked by the texture and surface sands used in the manufacturing process becoming visible after bricks are laid as a result of natural weathering of exposed brickwork. Dampness of the brick wall More or less permanent dampness showing more clearly on the internal wall surface from ground level up to a height of about 750mm, but may be higher in severe cases or if the outer face is covered with a non-porous finish. The decorations may be damp, blistered or discoloured, or, if dry, may have been pushed off the wall by a film or salts which will often be seen as a fluffy crystalline growth. The possible causes of dampness in the brick wall are lack of dpc (damp proof course), by-passing of the dpc, Failure of the dpc material. Brick growth and expansion gaps in brickwork Bricks undergo long-term permanent expansion over time. This expansion continues for the life of the brick, but the majority of the growth occurs early in its life. Most general purpose bricks have a coefficient of expansion in the range of 0.5-1.5mm/m (millimeters per meter) over fifteen years. Designers can use the values of the coefficient of expansion to accommodate for the growth of bricks by the size and spacing of the control joints. The provision of control gaps or articulation joints between parts of the structure during construction will accommodate movements within the structure over time. Numerous sources of movement exist and include: The change in size of building materials with temperature, loading conditions and moisture content The differential change in size of building materials (for example, cement products shrink over time, whilst clay bricks expand slowly over time) Foundation and footings movement Frame movement Frame shortening Temperature movement Internal horizontal and vertical movement Causes of the brickwork defects Introduction: Brickworks are used primarily in the construction of walls. To construct the brick wall required many skills, design, experience, selection of material, and technique. Lack of all expertise may cause the brickwork defects or failure of the building. The defects that occur in brickwork maybe the result of inherent faults, deficiencies in production, design, materials or workmanship, and attack by environmental agents. After the brickwork has been constructed, it maybe meets of various requirements, climate, loading, and occupational in use. It is not surprising that defects happened or occurs frequently. In this sub chapter, the causes of the brickwork defects will be list out. To find out the actual causes of the brickwork defects will be easily for the occupational to take the right remedies immediately and reduces the brickwork defects happen. Selection of bricks The choice of bricks is often influenced by the price but the quality required must also be carefully considered in order to avoid defects developing during the service life of the material. Therefore, the selection of suitable bricks for any particular purpose has often to be a trade-off between appearance and durability requirements on the one hand, and cost on the other. This is not always possible to assess the quality of bricks by the colour, variability of colour of bricks of the same source and method of production can often be an indication of strength and durability variations. Storage of bricks Bricks on site are rarely kept under adequate cover. Defects in the bricks resulting from the lack of adequate protection on the site are rarely apparent before use. However, bad weather conditions can be detrimental to bricks in that saturation by rain can be responsible for both subsequent efflorescence and decoration defects. Soluble Salts in Bricks Under burnt bricks contain a high salt content. The salts come from the raw clay from which the bricks are made, or are formed in the burning process. Most clay bricks contain some soluble salts, but the types and amounts vary appreciably. The effect of the soluble salts on both efflorescence and the more serious problem of disintegration of bricks themselves are largely governed by the strength and pores structure of the bricks. Sulphate attack Sulphates are salts which are naturally present in industrial waste, gypsum product, clay bricks, flue condensates and in some ground waters. In persistently damp conditions, sulphate will react slowly with tricalcium aluminate forming a compound called calcium sulphoaluminate. This reaction causes the cement mortar or render of the brickwork to expend and eventually disintegrate. Solar Radiation While drying out of soil by trees is the most common reason for cracking in brickwork, some clay are also very susceptible to drying out by direct solar radiation. The northern facing wall is the most likely to be affected and stepped diagonal cracking is the most common symptom, usually occurring at the north east and north west corner of the building. (Greg Loveder, 2000) Migration of moisture The movement of moisture beneath a building can produce the phenomenon known as long term dome and saucer effect. The dome effect is a slow heaving of the soil caused by movement of moisture from the perimeter of the house to its centre, and the saucer effect is moisture moving in the opposite direction, from the centre towards the perimeter. The dome effect causes the walls to tilt outwards and the restraining influence of the roof produces horizontal cracks on the outside wall. These will be wider on the outside surface rather than the inner. Planting of tree Some of the brickwork defects may cause by big trees roots that plant nearby the building area. When planning to plant trees, the idea to be considering is the strength of the footings under the house. If lack of strength, the roots of the trees maybe grow into the ground under the building and cause the brick wall settlement and cracking. Uneven settlement of foundations Where a particular heavy load is placed on the foundation such as a large column, movement may occur as moisture is squeezed out of the soil or the soil readjusts itself. This consolidation will stop when the soil has finally compacted enough to support the load. Brick wall or masonry wall may crack which may result from movement during compaction. Excessive vibration Damage caused by vibration from earth tremors, heavy traffic or pile driving is fairly rare, however if the vibration is great enough to actually cause the foundation to move, brickwork cracking or defect can occur. The crack will show up irregularly if the sources of the vibration cannot be removed. (Greg Loveder, 2000) Additional building Building an addition building onto a house or add more storey of houses can impose a load intensity on the soil different that which is there already and so cause differential settlement. Even if the loading intensities are similar, the difference in time between when the two settlements occurred can be enough to create the brick wall cracks. Approach of design Design of brick wall is very important. The designer must have the knowledge about the brick experience in chosen the types of brick to be used. The designer must be fully aware of the clients needs. Defects often occur because of a lack of understanding of the different types of bricks and the method of construct the brick wall. Lack experience of worker Workers in the masonry construction is not in strict accordance with the construction and standards, masonry mortar is not full, especially in vertical mortar joints are not full, and even produce dense seam, seam permeability. In addition, the dry brick on the wall, mortar in the brick water was absorbed, causing low strength of mortar, brick and mortar separation, so that the overall stiffness of masonry fell, gray mortar joints crack. Overloading Cracks of brickwork may result from overloading of the ground on which the building rests, or of the building itself or parts of it. Releasing the load does not necessary allow the masonry wall to revert to its original state since the overloading may have been partially accommodated by a permanent compaction of the bricks. The forces responsible for the overloading may be of external origin, such as excessive wind, or may be internal, such as those arising from the installation of excessively heavy equipment for which the masonry wall was not designed. A change of occupational may have same results. Lack of maintenance Maintenance must be taken for all the building to minimize the cost of repair work for seriously defects happen. Lack of maintenance will make a small cracks or defects on brickwork change to more serious and serious. Improper soil analysis and preparation When a builder chooses an area of land to build on, it is important to do some sort of soil analysis and preparation. The analysis will provide the developer and/or builder with enough information to choose the adequate soil preparation and construction strategy that should be used to develop the land. Improper soil analysis and preparations can be very damaging to a housing development. For example, a builder can discover that the land soil is made up of expansive soil. If this is the case, houses need to have a foundation that will be able to support the changing pressure and consistency of the soil. This is because expansive soil will swell when wet and then shrink once it dries. If one builds on this type of soil and is not aware of it, there will inevitably be issues to handle. There will be crack in the brick wall or masonry wall. The repair of this is very costly and very intrusive. Unfortunately, the reality is improper soil analysis and preparations happen all the time. Negligence of construction Negligent construction is an unfortunately common occurrence. A builder has to be very careful when choosing a contractor or subcontractor. A builder will sometimes use one contactor for various projects. A contractor may have skills to install floor tiles but not the know how to build a brick wall. The responsibility can fall on several parties when there is a defect, and thats up to your attorney to determine. Movement of the ground Mining subsidence, landslips, earthquakes, or moisture changes of shrinkable clay soil may cause the movement of the ground. The brick wall of the building will be crack because the wall of building has become displaced from the rest without any change in actual size of the materials. In theory, this is possible to reconnect the displace parts to bring the building back to its original condition but in practice this seldom can be done. Acid rain Acid rain is precipitation that is much more acidic than normal rainfall, and the acid rain is usually caused by pollution such as sulfur and nitrogen emissions. Several different mechanisms are operant in the deterioration of brick masonry through the action of acid rain. The bricks are susceptible to acid rain through the selective dissolution of their glassy phase. The mortar is affected mainly by the reaction of the calcareous components. The soluble salts resulting from these reactions, in solution with rain water or condensed moisture, will migrate through the porous matrix of the masonry. In the places where the water evaporates the salts will be deposited. Repeated dissolution and re-crystallization of these salts leads to the mechanical disruption of the masonry structure. Since the salts will concentrate in the more porous material, either the brick or the mortar will be more seriously affected, depending on their relative porosity. Environment Two aspects of the environment have been considerably which is wind and temperature. This is because they cause loading to be applied to the structure. The strong wind may cause the brick wall or the whole building move, this may cause cracking to the part of the building. The high temperature applied to the brickwork may cause spalling and brick prolong to high temperature can lead to surface vitrification. (A.M.Swoden, 1990) Remedies method of the brickwork defects in building Introduction: As known early, brickwork is one of the largest parts of most of the building. The strength, stability, and durability of brickwork are very important. If lack of all those factor, the brick wall or masonry wall maybe fall down or collapse suddenly. If the brickwork occurs any cracking or defects, the right method of remedies must be taken immediately. This is to ensure that the occupational or owner use the building under safety and healthy purposes. Brickwork will deteriorate and decay if not properly maintained. Such deterioration can be caused by a number of factors and can take various forms. The main signs that brickwork is suffering are surface growth and staining, efflorescence, loosed brick becoming dislodged, crack appears throw the bricks or mortar and etc. So, the right remedy must be taken to ensure the brickwork do not decay and deteriorate. (Moses Jenkins, 2007) In this sub chapter, the remedies method for various types of defects will be list out. This is to avoid the brickwork defect getting serious in building in construction industry. The defects of brickwork must be repair immediately, if not the defects will be more serious. For example, cracking can be due to expansion or shrinkage the clay brickwork itself. Remedies of efflorescence Efflorescence can be minimized by laying dry bricks and by speeding up the drying process after the bricks have been laid by providing good ventilation. The salts that cause efflorescence are soluble in water. Hosing with water will cause the salts to dissolve and be re-absorbed into the brickwork, and then reappear when the brick wall dries out again. Acid or alkaline treatments are not recommended as they increase the salt content of the wall. The best method is simply brush off the deposit with a stiff dry bristle brush after the wall has dried out. Then sponge the surface with a damp synthetic chamois or high suction sponge. Use very little water and rinse sponge frequently in fresh water. Remedies of sulphate attack The effects of sulphate attack manifest themselves as expansion of the jointing mortar. On rendered walls the signs are horizontal cracking of the rendering with portions falling off. Advanced stages of attack may make the structure unsafe. When rebuilding is necessary, the bricks use should be of low sulphate content and the mortar should be of a mix of 1:1:6 sulphate-resistance Portland cement: hydrated lime: sand. In addition, care should be taken to exclude all conditions of dampness. On rendered walls, the rendering should be removed and the brickwork allowed to dry before reapplying a weaker mix of sulphate-resistance cement, lime and sand. Tackling Decay Where decay has occurred, take action to rectify the damage will be necessary before this leads to greater problems. The use of chemical treatments to stabilize brick should only be considered with extreme caution. Whilst the defects may be effective initially, there has been insufficient research carried out on the possible long term damage such treatments could have. Chemical sealants can trap moisture within the brick just as effectively as the claims to keep water out. Cleaning Cleaning soiled brick buildings should be undertaken carefully. In the past, the use of inappropriate cleaning techniques has resulted in considerable damage being done. If considered essential small scale tests should be employed to assess the effectiveness and likely damage which could be caused before any large scale work is carried out. There are some guides when doing the cleaning works:- Do not re-clean brickwork with the same chemicals unless recommended by the cleani

Photosynthesis Essay

Photosynthesis Essay During the Light Dependent Reactions, activity occurs within the thylakoids of the chloroplast. NADP+ accepts two high energy electrons and an H+ ion and then converts into NADPH. This process ultimately traps some of the sunlight in chemical form. Then, NADPH is able to carry the energy it absorbs to the rest of the cell. The reaction produces O2 gas and converts ADP to ATP and NADP+ to NADPH. First, pigments in Photosystem II absorb light, which is then absorbed by electrons, which are then passed along the Electron Transport Chain.Chlorophyll loses an electron, but interestingly, those missing electrons are replaced through enzymes in the thylakoid membrane, which divide H20. Secondly, electrons move through the Electron Transport Chain from PII to PI and an H+ ion moves from the stroma to the inner thylakoid space. Thirdly, pigments from PI use energy from light to reenergize electrons; NADP+ picks them up along with H+ ions in the outer surface of the thylak oid, making NADPH.Next, as the electrons pass from chlorophyll to NADP+, more H+ ions are being pumped through the membrane to the inside of the thylakoid, which accounts for the inside being positive and the outside being negative. Lastly, ATP synthase, which spans the membrane, allows the H+ ions to go through it. As they go through, the synthase spins and rotates and binds an ADP to a phosphate group, producing ATP. Specifically, the Light Reactions can either follow a noncyclic electron pathway or a cyclic electron pathway.During the noncyclic electron pathway, PII absorbs solar energy, which is passed along pigments until it is concentrated in a particular pair of chlorophyll a molecules, called the reaction center. Here, the electrons become very energized that they escape and go to electron acceptor molecules. The electron acceptor sends electrons down the ETC and ATP production occurs when they flow their gradient in ATP synthase. PI absorbs solar energy, but the electrons a re captured by different electron acceptors, which pass electrons to NADP+.Each one accepts two electrons and an H+ to become NADPH. The cyclic electron pathway is the same as the noncyclic pathway, where ATP production occurs; however instead of electrons moving to NADP+, they return to PSI, which how it receives replacement electrons. This is why it is called a cyclic pathway; ATP production occurs but not NADPH production. The Light Independent Reactions, also known as the Calvin Cycle and or the â€Å"dark cycle†, ATP and NADPH produce high energy sugars.To begin the cycle, six CO2 molecules enter from the atmosphere and combine with six 5-carbon molecules to form twelve 3-carbon molecules. Next, these are converted into higher energy forms using ATP and high energy electrons from NADPH. Lastly, two of the twelve 3-carbon molecules are removed from the cycle, used by the plant for metabolism and growth; the remaining ten are converted back into six 5-carbon molecules, whi ch ultimately begin the next cycle.The Calvin Cycle has three in depth parts: C02 fixation, C02 reduction, and RuBP regeneration. During C02 fixation, C02 from the atmosphere is attached to RuBP, which is a 5 carbon molecule, which splits into two 3 carbon molecules. RuBP carboxylase is the enzyme that speeds up this reaction. Secondly, both of the 3PG molecules formed undergoes reduction to G3P: ATP and NADPH are used as energy to fuel this reduction where carbon dioxide reduces to a carbohydrate (R-CO2 to R-CH20).Lastly, the Calvin Cycle has to cycle three times for one G3P to exit. This occurs because five molecules of G3P are used to reform three RuBP molecules. Glyceraldehyde -3-phosphate, G3P, produced from this cycle is an ultimate carbohydrate used for nutrition for most living things on Earth. Glucose phosphate is an organic molecule that results from G3P metabolism. Glucose is essential to plants and animals to be able to produce ATP for energy purposes. Glucose phosphate is also the starting point for the synthesis of starch and cellulose.