Causes of Luminescence and Chemiluminescence

Causes of Luminescence and Chemiluminescence 1.1. Luminescence Phenomena Luminescence is the phenomenon of emission of electromagnetic radiation in excess of thermal radiation. The radiation is usually in the visible region of the electromagnetic spectrum, however, since the same basic processes may yield infrared or ultra violet radiation. Luminescence is observed with all phases of matter: gases, liquids and solids both organic and inorganic[1]. Luminescence is an umbrella term for those kinds of events where light emission is not the result of high temperature. In fact with increasing temperature the competing nonradiative de – excitation processes become more probable and the intensity of the luminescent emission decreases. Luminescence in living organisms has been reported as far back as 1500 BC. In Chinese literature, the best known examples being the emission of light from fireflies and glow – worms[2, 3]. 1.1.1Types of Luminescence Classification according to the means by which energy is supplied to excite the luminescent molecule[4-8].Table 1.1 Table (1-1):- Different types of luminescence phenomena Excitation source Luminescence type Produced from irradiation Absorption of Uv-vis or near IR radiation. (Conversion of light energy to chemical energy). Photoluminescence Emission produced from irradiation of ÃŽ ² particles. Cathodoluminescence Emission produced from irradiation of ÃŽ ± particle. Anodoluminescence Radiation-induced chemical excitation (irradiation of ÃŽ ³ particles. Radiodoluminescence Produced from heating. Emission from incandescent solids Candoluminescence Caused by solid subjected to mild heating. Thermoluminescence Flame-excited metal atoms Pyroluminescence Produced from structural rearrangements in solids Emission from shaking, rubbing, or crushing crystals. Triboluminescence Emission from crystallization. Crystalloluminescence Excitation induced from dissolution of an irradiated or other energy-donating solid. Lyoluminescence Produced from electrical phenomena. Radiative recombination of electrons and holes in material (emission from electrical discharge) Electroluminescence Emission during electrolysis Galvanoluminescence Excitation of compounds by ultra-sonication. Sonoluminescence Emission from fractional charge separation at the crystal surface. Piezoluminescence Produced from chemical reactions Emission from luminous organisms. Bioluminescence Chemical excitation of compounds. Chemiluminescence 1.2. Chemiluminescence The term chemiluminescence (CL.) was first coined by Eilhardt Weidman in 1888. Chemiluminescence is defined as the production of electromagnetic radiation observed when a chemical reaction yields an electronically excited intermediate or product. CL-reactions emit light of varying degrees of intensity and lifetime. With colors that spare the visible spectrum [9-11]. Analytically, the CL-reactions are attractive due to: excellent detection limits results from the absence of source of noise and scattering, suitable to both batch and flow techniques highly sensitive, determinable over a wide range of concentrations, easy to operate, simplicity, absence of unwanted background so the only background signal is that of the PMT dark current and no excitation source or optical filters are required as compared to other optical or photo luminescence methods [12, 13]. However, some disadvantages are to be considered as well; A chemiluminescence reagent may yield significant emission not just for one unique analyte i.e. a lack of selectivity may occur. Moreover, chemiluminescence emission intensities are sensitive to a variety of environmental factors such as temperature, solvent, ionic strength, pH and other species present in the system. As a result, a separation condition (HPLC, capillary electrophoresis (CE), may not always match the optimum CL-emission conditions. Third, as the emission intensity from a CL-reaction varies with time,light flash composed of signal increase after reagent mixing, passing through a maximum, then decreasing back to the base – line, thus the CL- emission versus time profile differs from one compound to another and care has to be taken to detect the signal in the flowing stream during strictly defined periods [14].chemiluminescence technique is versatile for determination of a wide variety of species that can participate in the CL-reaction such as; CL-substrates or CL-precursors responsible for the excited state [15], the necessary reagent for the CL-reactions (usually an oxidant) [16] , some species that enhance the rate or sensitivity of the CL-reaction[17] ,activators such as catalysts (enzymes[18] or metal ions[19] CL. analysis found a wide application not only in the organic technology, medicine, food testing, but also in environmental monitoring and material science [20-24]. CL-reactions can be coupled as a detection technique [25] in chromatography [26, 27], capillary electrophoresis [28-30], or immunoassay, providing qualitative and / or quantitative information [31, 32]. 1.2.1. Mechanisms of Chemiluminescence Reaction Figure (1-2) shows the types of the CL-reaction mechanisms. In general CL-reactions can be generated by two basis mechanisms: Figure (1-2):- Types of CL-reactions. P, product; F, fluorescing substance Direct CL-reactions: a substrate (A) and an oxidant (B) in the presence of cofactors react to form an intermediate product in an electronically excited state which relaxes to the ground state with a photon emission. The catalyst is an enzyme or metal ions, reduces the activation energy and provides an adequate environment for producing high CL-efficiency out of the process.Cofactors sometimes are necessary to convert one or more of the substrates into a form capable of reacting and interacting with the catalyst,or to provide an efficient leaving group if bond cleavage is required to produce the excited emitter [33]. An alternative for compounds producing ultra-weak CL-emission is: Indirect or sensitized CL reactions: Since not all excited states of CL-reactions products are effective â€Å"emitters† in any case, thus the excited state energy can be transferred to an â€Å" effective â€Å" flourophore added to the system, in –order to increase the CL-intensity substantially . The most salient asset of chemical excitation is the low background noise involved, which results in very low detection limits (in the sub femtomole of region) [34,35]. Enhanced CL- reactions (ECL): describes the phenomenon which has been observed in a wide range of chemi and bioluminescence reactions. Enhancement of light emission from the luminol-hydrogen peroxide reaction at alkaline pH has been achieved by the addition of various organic compounds generally containing oxonium group. Enhancement of CL. Reaction led to intense light emission, prolonged light emission and low background[36]. Spontaneous light emission during reaction requires the presence of the following conditions[37]: The reaction must be highly exothermic (40-70 kcal/mole) in order that the CL-reaction occurred in the visible region (400 nm (violet) – 750nm (red). These exothermic conditions associated with redox reactions using Oxygen, Ozone andhydrogen peroxide or similar potential oxidants. The reaction pathway must be a favorable to channel the energy for the formation of an electronically excited state. Photon emission must be favorable deactivation process of the excited product in relation to other competitive non-radiative processes that may appear in low proportion. There are several ways for an electronically excited state species to lose its extra energy, either by reacting with another molecule, molecular dissociation, and collision with its surrounding molecules or luminescence. In the latter case it can react to liberate sufficient energy to produce photon of visible light, figure (1-3). Figure (1-3):-possible de-excitation pathways of excited molecule 1.2.2. Main Chemiluminescence-systems for analytical processes 1.2.2.1. Gas- phase chemiluminescence reactions. The development of Chemiluminescence Methods for determining components of a gas is largely originated from the need to determine atmospheric pollutants such as Ozone, Oxides of nitrogen and sulfur compounds[45, 46].The best known and most frequently used is the reaction of nitrogen oxide withOzone.CL-NOXanalyzers have been shown to respond to a number of nitrogenous pollutants besides NO and NO2. [40].Some analytical methods based on CL- reactions have been proposed for the determination of sulfur monoxide and unsaturated hydrocarbons such as Alkenes, alkynes and aromatics at high temperature,several of these are as follows[41-44]. NO+ O3NO2* + O2NO2 + hÃŽ ½(600-2800 nm)(1) (2) (3) Oxygen atoms also been applied as strong oxidants when reacted with a wide range of analyst, although not so frequently used. The reaction with nitric oxide produces a yellow- green CL-emission that has been used for measuring concentration of Oxygen atoms in kinetics experiments[45]. (4) Some CL. Reactions are based on the light emission produced in flame, rather than the cold CL-emission. Molecular emission cavity analysis (MECA) is a CL-technique in which molecular emission are generated within a cavity that is introduced into a hydrogen diffusion flame. This flame acts as the environments of radicals, atoms and molecules which promote the chemical reactions (i.e. high temperature of flame promote of chemical reactions that form key reaction intermediates and provide additional thermal excitation of the emitting species).The cavity acts as the environment for stabilizing the emitting species. MECA has been used for selective detection of compounds containing sulfur, nitrogen, phosphorous, antimony, arsenic,.Tin and halogens [46-54]. 1.2.2.2. Liquid- phase chemiluminescence reactions There are some well – established CL-reagents that have been used for solution – phase CL-reactions, their attraction include high sensitivity, wide dynamic range and simplicity [55].The Chemiluminescence of luminal and the cyclic hydrazides of aromatic and heterocyclic acids is one of the classical and still studied in CL-reactions [56]. Although hydrazides in general are Chemiluminescent, onlyhydrazides related to luminol (5 – aminophthalyhydrazide) can be considered the most commonly used. The CL. of luminol was first described by Albrecht in 1928. This compound reacts with potent oxidizing agents in the presence of catalyst in alkaline medium to yield 3 – amino phthalate in an excited electronic state which returned to the ground state; with the production ofblue emission at 425 nm.The reaction is catalyzed by metal ions.Alternatively, it has been proposed that the metal ion forms a complex with the hydrazide which is then oxidized[57–59]. Lophin(2,4,5 – triphenylimidazole) is the most representative of the imidazole CL-precursors . A yellow CL-emission is produced at 525 nm. by oxidation of Luphin in aqueous alkaline mediums[60]. Lucigenine(10, 10 dimethyl – 9, 9 -biascridiniumnitrate) is one of the most efficient CL-substances which emit an intense green emission at 470 nm. When oxidized in an alkaline medium [61]. In relation to indirect CL., one of the more efficient non – biological system that are used is based on and so – called peroxy oxalate CL-reaction (PO – CL ) which involves the hydrogen peroxide oxidation of an aryl oxalate ester in the presence of a fluorophore .Bis–( 2,4,6 – trichloro phenyl )oxalate (TCPO) and bis – ( 2,4– dinitro phenyl ) oxalate (DNPO ) are commonly used oxalates. These compounds are insoluble in water which requires the use of organic solvents such as acetonitrilies ,dioxane and ethyl acetate [62]. Another CL-system frequently applied involves the use of Ru [bpy]3+2 which produces an orange emission at 610 nm.From the excited state (Ru [bpy]3+2)* that can be obtained by different reactions which imply electron transfer and regeneration of Ru[bpy ]3+2 species. Recently , the higher CL-emission generated by a similar complex , Ru[phen]3+2(phen = 1,10 – phenanthroline) during oxidation ofRu [bpy ]3+2 by Ce(IV) in sulfuric acid medium Ru [bpy]3+2 is the most studied as an inorganic compound used in electro generated CL (ECL)[60,63]. 1.2.2.3.Solid Phase Chemiluminescence [35]. Some polymers exhibit weak CL. in the visible range when heated up in the presence of inert gas (air or oxygen). For the first time this phenomenon was observed by Ashby in 1961, from polypropylene. Emission of light during oxidation of polymers is called oxy- luminescence or oxychemiluminescence. And for CL. of polymers to be observed, oxygen must be present in the process. 1.2.3.Electro Generated Chemiluminescence (ECL) ECL : is the process in accordance with which , species generated at electrodes undergo high – energy electron – transfer reactions to form excited states that emit light , it occurs in the visible region of spectrum as a consequence of fast and highly exo-energetic electron . Transfer between a strong electron donor and electronacceptor which in turn results in generation of excited states [7].In general, electrically generated reactants diffuse from one or more electrodes, and undergo high – energy electron transfer reactions either with one other or with chemicals in solution. This process yields excited state molecules, which produce a CL- emission in the vicinity of the electrode surface. Application of ECL have almost exclusively focused on the reaction of tris(2, 2 – bipyridire) ruthenium Ru[bpy]3+2 the reaction takes place at room temperature . Wide pH range and in the presence of oxygen and many other impurities[64].Ru [bpy]3+2 itself can undergo electron transfer reactions to produce ECL as follows [65]. Luminol can undergo an ECL reaction due to its versatility in analytical determinations. in alkaline solution luminol anion undergoes a single electron electro-oxidation to form diazaquinine , which is further oxidized by peroxide or super oxide to give 3 – amino phthalate in an excited state , which emits light at 425 nm . Luminol ECL has been used for determination of species such as phenyl alanine, ibuprofen and hisidine [9]. 1.3. Fluorescence Photoluminescence becomes visible as optical radiation accompanied by the emission of photon depending on the duration of the phenomenon, i.e. life time of the excited state. Fluorescence is the spontaneous emission of light during transition of the system from its lowest vibrational energy level of an excited singlet state S1 back to the ground state S0,thus it’s a spin allowed process. Absorption and fluorescence don’t require any spin reorientation however; intersystem crossing and phosphorescence require a spin reorientation therefore; absorbance and fluorescence are much faster than phosphorescence. The processes that occur between the absorption and emission of light are usually illustrated by Jobalonski diagram [66, 67]; figure (1-4). Figure (1-4):- Perrin- Jobalonski diagram and illustration of the relative positions of absorption (Abs), fluorescence (F), andphosphorescence (Ph.) Fluorescence is the result of three stages process that occurs in certain molecules called fluorophores [67]. Excitation: a photon is supplied by an external source and absorbed by the fluorophore creating an excited electronic singlet state S1. This stage distinguishes fluorescence from chemiluminescence, in which the excited state is populated by a chemical reaction. State life time:fluorescence life time is typically 1-10 Nano sec. during this time the fluorophore undergoes conformational changes and is also subjected to a multitude of possible interactions with its molecular environment such as collisional quenching and intersystem crossing. Fluorescence emission: when a photon of energy is emitted returning the fluorophore to the ground stat S0. Figure (1-5) shows these three stages. Figure (1-5):- three stages of fluorescence emission process 1.3.1. Characteristics of fluorescence emission [68-70] Emission spectra are typically independent of the excitation wave length due to the partial dissipation of excitation energy during the excited state life time, this known as Kasha’s rule. The emission intensity is proportional to the amplitude of the fluorescence excitation spectrum at the excitation wavelength; figure (1-6). Figure (1-6):- emission spectra are typically independent of the excitation wavelength Stokes shift: due to the energy dissipation during the excited state life time, the energy of this photon is lower and therefore; of longer wavelength than the excitation photon (i.e.fluorescence light is a red-shift). This difference in energy or wavelength is known as stokes shift.† The difference in wavelength between positions of the band maxima of the absorption and emission spectra of the same electronic transition; figure (1-7). Solvent effects and excited state reactions can also affect the magnitude of stokes shift. Figure (1-7):-stokes shift of band maxima E = hÃŽ ½ = hÃâ€"c / ÃŽ » (1) h = Planck constant = 6.63 Ãâ€" 10-34 J.sec-1 c = light velocity ÃŽ ½ = light frequency Sec-1 or Hz ÃŽ » = wave length nm. Absorption energy EAbs.= hÃâ€"c / ÃŽ »Abs. (2) Emission energy Eem.= hÃâ€"c / ÃŽ »em. (3) Since: EemAbs. (4)so: ÃŽ »em.>ÃŽ »Abs (5) ÃŽ »em.,ÃŽ »Abs: emission and absorption spectra peaks respectively. When absorption and/or the emission spectra of a flourophore possess two or more bands, stokes shift is equal to the difference that separates the two most intense bands of the two spectra, figure (1-8). Figure (1-8):-stokes shift in a flourophore possess two bands If thermal energy is added to an excited state or compound has many highly populated vibrational energy levels, emission at shorter wavelengths than those of absorption occurs, this is called an anti-stokes shift and its often observed in dilute gasses at high temperatures. A key feature of fluorescence is the molecule spends a measurable Amount of time in the singlet state. Fluorescence life time refers to the average time that the molecule stays in its excited state before emitting a photon for fluorescence; it’s typically in the range (1-10 nsec.). Fluorescence radiant power (F) is proportional to the absorbed radiant power. F = É ¸ (P0 – P) - (6) É ¸: Fluorescence efficiency. P0: incident power. P: transmitted power. The relationship between the absorbed radiant power and concentration can be obtained from beers law P/P0 = 10-A- (7) P = P0 Ãâ€" 10-Ɇºbc - (8)F = É ¸ P0 (1–10-Ɇºbc)- (9) Structural factors. Fluorescence is expected in molecules that are aromatic or multiple conjugated double bonds with a high degree of resonance stability, it’s also expected with poly cyclic aromatic

Essay examples --

Ability Grouping and Tracking in Schools Famous American author Mark Twain once said, â€Å"I have never let schooling interfere with my education† (The Quotations Page). School is sometimes a difficult place to learn. Teachers can’t be expected to give an individualized lesson to thirty students at once. This task increases in difficulty when not all of the students are behaving or when the students are at different levels of learning. Some schools, however, are attempting to make learning easier on both students and teachers. The methods of tracking and ability grouping are revolutionizing the way teachers teach and students learn. Tracking and ability grouping are two separate practices, but they share many similarities. Ability grouping is used most commonly in elementary schools, while tracking is used in high schools. Both practices involve grouping students by their abilities in schools. The main difference between the practices is tracking is between classes, while ability grouping is within individual classes. Tracking, in other words, is different for every subject. Ability grouping is grouping within an individual class (Loveless). The main arguments against tracking and ability grouping deal with the lower-level students. Critics argue that ability grouping can create a "self-fulfilling prophecy" for lower class and minority students, who tend to be placed in the lower-achieving classes or groups (Thompson). Also, some argue that the lower-level classes may not receive the same quality of instruction as higher-level classes, increasing the achievement gap (Sosnowski). To help shrink the achievement gap, teachers will often reshuffle groups when using the ability grouping method. Sometimes, teachers will give t... ...my entire high school career. Ability grouping and tracking are practices that could greatly benefit every school system and every individual student. Lower-level students would no longer feel pressured to learn at an uncomfortable pace. They would have the opportunity to receive additional instruction on concepts that they struggle with. Higher-level students would have opportunities to learn at an accelerated rate, and they would have a chance to explore concepts in much greater depth. These students wouldn't feel like they are constantly waiting for the other students to catch up with them. American journalist Sydney J. Harris said, "The whole purpose of education is to turn mirrors into windows" (Sydney J. Harris Quote). Tracking and ability grouping can help transform our generation of mirrors into windows that can change the world with our knowledge.

The Virgin Group

Sam Yates-Smith Student ID: 000292201 CASE STUDY 6 THE VIRGIN GROUP 1. The corporate rationale of the Virgin group is to re-ignite static industries, with fresh ideas and developments, thus offering the consumer differentiation. Diversification is an extremely important attribute of Virgins rationale. Their SBU’s improve Virgin’s scope and therefore its existing markets and products. Virgin uses the ideology of ‘the corporate parent’ to add structure and guidance to its various business units, which in turn adds value due to the effective, disciplined approach that the rationale provides. . There are certain strategic relationships between businesses within the Virgin portfolio, these lie in ‘economies of scope’. This term refers to the notion that the Virgin groups have synergy amongst its SBU’s, therefore utilizing free standing tangible and intangible resources in order to fully comprehend and fulfill a particular new environment or m arket. This adds value to a new market whilst ensuring resources are not wasted. An example within Virgin would be their research into the global oil market and the search for greener fuels for its airlines. 3. Virgin as a corporate parent adds value to its group via the collective ambition and ideology which is ascertained via the strength of the Virgin brand. One aspect of Virgins Corporate parenting is the ideology of ‘envisioning’. Virgin provides ‘strategic intent’ by laying certain ideologies for its SBU’s to follow. This provides discipline and strong methodologies for the units to adhere too. Another element of ‘value adding’ via Virgins parenthood can be explained using the BCG matrix. The Virgin group’s portfolio shows high market share and strong growth within their markets. These positive denotations enable management to visualize the potential of concurrent markets and ensure growth is fully realized. 4. ‘’The greatest threat that the Virgin brand may become associated with failure’’ (Johnson et al, 2009). This signifies one of the issues facing the Virgin group. The larger the Virgin portfolio gets, the more issues they will face regarding the density of their diversification and therefore ensuring consumers are not undermined and loyalty is retained. Another issue is that of waning portfolio and growth which is susceptible to ‘slowing down’. Recognition of ‘Stars’ (BCG) turning into ‘Dogs’ is extremely important to ensure the correct visualization is atoned for and that growth is relative to the portfolio’s strength as a whole and not allowed to become complacent, leading to surplus resources and market share. 1

Problems and Prospects of Bangladeshi Tourism Essay Example

Problems and Prospects of Bangladeshi Tourism Essay Example Problems and Prospects of Bangladeshi Tourism Essay Problems and Prospects of Bangladeshi Tourism Essay TITLE: Problems and prospects of Tourism Industry in Bangladesh. INTRODUCTION Tourism has become a very important and dynamic sector both in the world economy and particularly in Bangladesh. Its growth affects not only the activities directly linked to tourism but also other sectors. Tourism is already an important sector in some developing countries and will become so for others. Developing countries like ours have been fast growing in tourism industry terms in the world over the last Decade. Bangladesh is a developing country in Asia, holding high potentiality for tourism. Bangladesh Parjatan Corporation (BPC) plays an important role for the development of tourism. For a long time, Bangladesh has been an attractive destination for tourists. But at present, its position is not significant in terms of the international tourism market. The overall objective of this research will be to identify the issues and challenges in tourism marketing facing Bangladesh. We will identify the problems and prospects of Tourism industry in Bangladesh. PROBLEM FORMULATION Bangladesh has potentials to develop tourism as a growing industry. Developing countries have some common characteristics, such as extreme poverty and widespread conflict (including civil war and ethnic clashes), extensive political corruption, lack of political and social stability, human resource weakness (human assets index, nutrition, health, education and adult literacy), and economic vulnerability. Amongst these problems how can we bring out the best in the country is our issue. This research will focus on the problems and prospects of tourism in our country. SPECIFIC OBJECTIVES To identify the problems of our tourism industries. To define the government contribution in development of tourism sector. To know the private organizations’ contribution in development this tourism sector. To forecast the government contribution. To identify the future prospect of tourism industries of Bangladesh. To identify the current state of affairs regarding tourism industry in Bangladesh. To gather some knowledge about the tourism policy. To gather some knowledge tourism projects and spots of Bangladesh. To have some knowledge about the problems that are emerging in the tourism sector To know about the current problems as well as future problems that might take place in the tourism sector. To identify the variability of tourist attraction in Bangladesh. To identify potential strategies that can contribute to increasing the competitiveness of Bangladesh tourism. To ana lyse issues in tourism marketing in Bangladesh. To identify development trends in Bangladesh tourism.

Depression essays

Depression essays Depression describes feelings of sadness, emptiness, and grief which most people experience at some point in their lives. There are hundreds of treatments. The severity, type, and treatment are as different as each individual. Clinical depression is a form of mental illnesss which unlike normal sadness or grief, is of longer duration and significantly impairs the individual's ability to lead a normal life. Reactive depression occurs following a traumatic life event, such as job loss, divorce, or death of a loved one. The depression is more intence than would be reasonable for normal grief of unhappiness. Post natal depression is a serious disorder affecting about 10% of mothers after childbirth. Symtoms are more severe and last longer than in baby blues, bipolar disorder ( manic depression) involves periods of mania involving extreme happiness hyperactivity, rapid speech, a total lach of inhibition, and in more severe cases, delusions of grandeur. (Health Point Depression Pg. 1 ) Brain cells talk to each other by means of chemical messangers. When a person is exposed to too much stress, chemical communication in the brain begins to fail. When these messengers fail a person suffers from sleep disturbances, aches and pains, depression and anxiety. This condition is called overstress. Overstress runs rampant in certain families. Studies have shown that a persons' stress tolerance is determined by his inheritance. The levels of stress in our society will only increase. It is important for each of us to learn to deal with stress now. ( Health Education Stress , Depression, Anxiey, Drug use Pg. 2) Depression not otherwise specified some professionls portray this category as a garbage pail diagnostic category for depression. If someone is obviously depressed, but does not fit into any of the other categories, then this diagnosis is made. However, it is not a garbage pail, but provides a valuable way to cate...

Critically Assess The Difficulties Of Implementing Motivation Theories Essay

Critically Assess The Difficulties Of Implementing Motivation Theories In The Modern Workplace - Essay Example A consideration and approval of this is a precondition to effectual employee motivation in the workplace and consequently efficient leadership and management. My piece of writing on motivation theory and practice focus on different theories concerning human nature in common and motivation in particular. Fairly distant from the advantage and ethical worth of a selfless approach to treating colleagues as human beings and valuing human self-respect in all its types, study and observation prove that well motivated workers are more creative and prolific. A lot of psychologists over the years have made efforts to describe and categorise what motivates people. This became chiefly significant after the Second World War as the Western nations attempted to reconstruct their shattered industrial economies, and all through the '50s and '60s much was investigated and written regarding Human Relations. It was recognised that people who labored in organizations were more than just numbers and, if correctly handled, might not merely generate more, but also add extra. Frederick Herzberg searched and practiced clinical psychology in Pittsburgh, where he researched the work-related motivations of thousands of workers.He determined that there were two types of motivation: Hygiene Factors: that can de-motivate if they are not present - such as supervision, interpersonal relations, physical working conditions, and salary. Hygiene Factors influence the level of dissatisfaction, but are seldom referred as originators of job satisfaction (Herzberg, 2003, Pg 87-88). Motivation Factors: that will motivate if they are present - such as achievement, advancement, recognition and responsibility. Dissatisfaction isn't usually responsible on Motivation Factors, but they are quoted as the basis of job satisfaction. (Motivation Theories, Online, PG 1) Abraham Maslow's Hierarchy Of Needs Abraham Maslow was an American behavioural psychologist who worked both in academia and industry. He issued a number of Human Relations books until the early '70's, but it was his first book, "Motivation and Personality", published in 1943, that put out his thought of the hierarchy of human wants. The Hierarchy Of Needs Maslow disagreed that the factors that compel or motivate people to perform lie on an ascending scale. Once a group or order of needs is satisfied, the individual will not be motivated by more of the same, but will search to satisfy top order needs. What's more, a higher order need will not be a motivator if lower order needs stay unmet (Pintrich & Schunk, 2001, Pg 24-25). Maslow classified five orders of needs, listed in ascending significance: Physiological According to this order of need, the fundamental endurance necessities of affection, protection and food Security should be motivated. These comprise the requirements we have for oxygen, water, protein, salt, carbohydrates, calcium, and additional minerals and vitamins. They in additionally comprise the need to uphold a pH

Screening the Project with R-W-W Essay Example | Topics and Well Written Essays - 500 words

Screening the Project with R-W-W - Essay Example This satisfied our curiosity on whether people actually need the service. We will be mostly focusing on UBC campus area where our market ranges from students to faculty members to visitors. The market for Cargo exist and is pretty wide, Umbrella2go won’t focus on a specific segment, but rather all who use an umbrella during the day (Statista 2015). Demand for umbrella is highest in a rainy season. However, the umbrella is becoming an all-whether necessity with changing lifestyle and fashion needs. University students are reported to take Umbrellas in a big way (Scaria 2015). There is a market for about 96 lakh pieces of umbrella that is not adequately met (Krishnakumar 2015). U2Go will mostly be competing with all umbrella sellers on campus, which range from the UBC bookstore, Sear shop, Shoppers, University Pharmacy, London Drugs shop, and the Umbrella Shop at Granville Island. However, as this service is new, there will not be any direct competition facing our organization, establishing a monopoly advantage. Those shops are located in fixed places and have single outlets. Our salespeople will be quite mobile and distributed in major streets where students are likely to pass through especially in the rainy or weather. Therefore, we will reach out to our customer and they will not look for us like the other shops (Vancouver Umbrella). The business will open 6.00 am in the morning and close 7.00 pm to cater for hours that students get in and leave school. However, the business will open overtime in rainy seasons when it is expected sales will be high when our competitors have closed. The price of an umbrella depends on the quality and durability. We are determined to provide all varieties to meet our customer’s interests. The average cost of an umbrella in Vancouver and particularly around UBC campus is $ 10-50.