PDA SIM Essay Example | Topics and Well Written Essays - 750 words

PDA SIM - Essay Example Determining a product’s lifecycle can enable a manager to make decisions of whether to invest more in a project or discontinue an operation. The three products HandHeld Corporation offers are X5, X6, and X7 devices. I noticed that the X7 product had weak sales. As a new CEO working for this business I seek out the advice of my top executives. Teamwork and cooperation are variables that improve the corporate culture and help firms achieve synergy. Synergy is achieved when the whole becomes more important than the sum of its parts (Schermerhorn & Osborn, Hunt, 2003, p.173). My top advisor indicated that the X7 product was in its growth stage. At that point I decided that discontinuing the product was not the right move because investing more in R&D could help increase the demand for the product. I noticed that the market saturation of the product in the first year was only 3%. The X7 product line had negative profitability. The company lost nearly $8.5 million on the X7 this year. The costs were higher than the revenues. I wanted to increase the price by 25% to offset the -17% profitability deficiency, but since the customer care about price I decided to go another direction. The problem with the product was the existence of a high fixed cost of $35 million. If I was able to sell more units then I would have more total profits to offset fixed cost. I lowered the price of the product by 10%. I allocated 50% of the R&D budget to the X7 because it had the lowest market saturation out of the three products. The X5 which was the most saturated product received 20% of the R&D budget and the X6 received the remaining 30%. I increased the price of the X6 hand device by $25 because the customer’s are not worried about price. I decreased the price of the X5 by $25 in order to increase its demand. My score after round 1 was completed was a score of 558,204,736. The 2006 profits were $347,929,621. I was able to turn the X7 into a profitable

Thomas Jefferson's view on slavery Research Paper

Thomas Jefferson's view on slavery - Research Paper Example In his life, Jefferson appears to have contradicted his writing, views, deeds and thoughts on the issue of slavery (Bernstein 56). Jefferson as an opponent against slavery As a young legislator and president, Jefferson took actions that he thought would aid in ending slavery. As a young legislator in Virginia, he had tried to advocate the private land owners to free their slaves. This was, however, unsuccessful as private land owners viewed this as a way towards economic downfall. They used slaves as cheap labor in their plantations and thus, if they had supported Jefferson in his advocacy for slavery end, they would have suffered economically. Although he failed in his advocacy for slavery abolishment by private land owners, Jefferson later returned to draft a bill barring freed blacks from staying in Virginia. He drafted a Virginia law prohibiting the importation of enslaved blacks into the state (Zinn 120). He was successful in the passage of this bill. Nevertheless, it is viewed that the private land owners in his state passed the bill to raise the price of slaves who were already their captives. In 1784, Jefferson forwarded a proposal to ban slavery in the newly created territories of the northwest. As the principal author of the land ordinance of 1784, he called for an end to slavery and involuntary servitude in these territories. Jefferson wanted a line to be drawn depicting the north and south at which slavery should not be extended westwards of the impassable line. This bill, however, was defeated by a single vote. Jefferson also proposed in the mid 1770s for a means through which those born into slavery could be freed. He referred to this as gradual emancipation by which after a certain date, those who were born into slavery became freed. In his advocacy for gradual emancipation of slaves, Jefferson wanted slaves to be resettled out of the United States, or they be returned to Africa (Spahn 65). He believed that once slaves were freed, the oppression they had suffered under their masters would breed hatred for their masters. He saw to it that the slaves would instigate violence on their former masters. It is in this thought that he believed the best plan would be to resettle slaves out of America. These actions show the efforts by Jefferson, while still a legislator, to end and stop slavery at the time. As president, in 1807, Jefferson signed an act which prohibited importation of slaves. This act helped to outlaw international slave trade in the United States although it took effect almost a year later. Jefferson was also the chief author of the declaration of independence in which he strongly argued against slavery (Zinn 49). Through the declaration of independence, he noted that slavery opposed nature which calls for every human being to be treated and respected equally. He called the institution to be immoral and not just. In his first draft of the declaration, he noted that every man was equal, and slavery did not replicate this but only caused oppression and death to those held captive. These statements represent Jefferson’s stance on slavery which he opposed. Thomas Jefferson’s views on slavery also became noted through his use of strong words in which he called for an end to the institution. Through his writing and correspondence with political and business associates, his strong words against slavery stood out. His

History of US Army National Guard Essay Example | Topics and Well Written Essays - 2250 words

History of US Army National Guard - Essay Example In 1636 Massachusetts followed in the footsteps of Virginia and established laws for militia on 13th December at the Massachusetts Bay Colony. The Dutch settlers in America also formed an organization on the similar lines as the English militia and named it the Burgher Guard. However, in 1653 the Dutch and the English engaged in a conflict over land. Such conflicts would arise time and again but in 1964 the British captured Amsterdam and the Burgher Guard surrendered and was then transformed to foot soldiers under the leadership of Captain Nicholas Bayard. The militia of each colony was responsible for its own funding and upkeep, thus the militia of each colony was vastly different from one another on basis of military equipments and substantial training. The militia assisted the Continental army during the Revolutionary wars and though it is believed that the militia had no crucial role in the winning strategy, it steadily gained importance. The Continental Congress passed its own f irst Militia Act on 18th July, 1775 while New York coded its own Provincial Militia Act on 22nd August, 1775. Federalists were of the opinion that instead of a militia regiment, fully trained and professional soldiers should be hired. But, no one paid attention to their arguments. In fact in 1776, New York’s militia was reorganized into two divisions. The first division included all the Manhattan (present New York) units while the Second division included the rest of the units. Again in 1789 the U.S constitution was signed and soon after in 1792 the U.S. Militia Act was passed. Both these steps proved that U.S supported the idea of including citizens in the military. Though such measures showed the firm belief that the Government had in the militia’s ability, but for some time the ability could not be tested because there was no such need. But, soon enough the militia got an opportunity to display its skills to safeguard the interests of the U.S. The British and the Fr ench were engaged in wars between themselves which interfered with the sea-trading rights of the U.S. The goods ship of several U.S. merchants were seized by the Europeans illegally At last the U.S congress had no other choice but to propose the Embargo Act in 1807 on the recommendation of President Thomas Jefferson which was finally passed as law on 22nd decenber,1907. On12th February, 1808, New York successfully passed the Act of Defense of the Northern and Western Frontiers, to protect its own interests. This increased hostility among the countries and in June, 1812. U.S declared war on Great Britain. This war, known as the War of 1812, continued for almost three years. However, here again the militia had no substantial role in the victory, because the militia was poorly funded and lacked good equipment and leadership. Yet, the U.S won because of the fact that Britain had no interests in the war and was fighting it almost for show. In fact all of Britain’s resources were e ngaged in war with France. Even after defeating France in the wars, Britain had no interests in the War of 1812 and again engaged herself with the colonization of the Eastern parts. The U.S had won the War but Britain did not acknowledge the defeat and offered peace to U.S on 11th February, 1815. The treaty of peace was signed on 20th

Regression Analysis Essay Example | Topics and Well Written Essays - 1000 words

Regression Analysis - Essay Example Lastly, regression analysis will be performed on statistically significant pairs of variables and regression line equation(s) of best fit will be written. Using Excel’s Data Analysis-Sampling, random number for data for country was generated (Figure 1) and corresponding records were taken from population. Table 1 in appendix shows the sample for correlation and regression analysis. Figure 3 shows the scatterplot of the GNP per head and the number of commercial vehicles. The relationship between the GNP per head and the number of commercial vehicles appears to be moderate (correlation, r = 0.556). Table 2 shows the correlation matrix for variables GNP per head, Cars per head and number of Commercial vehicles. The correlation for ‘the GNP per head and the cars per head’ and ‘the GNP per head and the number of commercial vehicles’ is significant at level of significance, ÃŽ ± = .01. Since, the correlation for GNP per head with the cars per head and the number of commercial vehicles is significant; therefore, there is strong possibility that GNP per head can be used to predict the cars per head and the number of commercial vehicles in any country. Table 3 shows the regression analysis output for the GNP per head and the cars per head using Excel. The higher value of F statistic suggests that regression is significant. GNP per head explains about 80% of variation in the cars per head. GNP per head (US $) significantly predict the cars per head,  ÃŽ ² = 0.00005,  t(28) = 10.54,  p   The slope of the regression equation suggest that each US $ increase in GNP per head adds an average of 0.00005 cars per head. The intercept is not meaningful as zero GNP per head implies negative value for the cars per head that is not possible. The regression equation can be used for predicting the cars per head of any developing

There are a number of problems associated with the rise of English as Essay

There are a number of problems associated with the rise of English as a world language - Essay Example Different factors work together in attaining such a privileged position. Research personals have pointed out various reasons that help to attain the position. In this regard David Crystal has the opinion that the military power is crucial. He rightly comments: â€Å"a language becomes an international language for one chief reason: the political power of its people- especially their military power† (Burns & Coffin 2001, p. 30). The international economy plays a vital role in determining the future of the English language. Due to globalization the patterns of trade is undergoing drastic changes and new working practices emerge powerfully. For example screen based labour is getting wider acceptance nowadays and it affects the use of the English language in composite ways. At present one can observe a perceptible increase in the number of persons learning and using the English language but a close examination will prove that the long term growth of English is comparatively lesser than its former status. The 20th century witnessed many scientific, economic, and cultural developments and in fact it boosted the relevance of English as well. But it cannot be expected that it will last long as there is a trend of wider mixed language use in the recent years. Mainly four sectors can be identified where English may loose its dominance. Say for the audio- visual market, computer based communication, the associated pro cesses in economic globalization and foreign language training in developing countries where the regional trade may use other language of economic importance. For hundreds of years the English language has been dominated over the mono lingual speakers but now it is expected to have a bilingual future. Language professionals have the opinion that an increasing proportion of the world’s population will be fluent speakers of more than one language in the coming years. It really will affect the dominance of English over the world population. Social value shifts also affect the language of English in a negative way. The actions of governments, institutions and individuals have helped the promotion of English in the recent years. But it was guided by the logic of economic rationalism. Now there is a great change in the public opinion that quality of life is as important as the income. These type values shifts will question the ethical issues associated with the dominance of a world language like English and cause a reassessment of its impact on other cultures (Graddol 1997). The advantages of a world language like English are several. For example in business it can be very important as a medium as the business personals working together may vary of their nationalities. There a common language has got such a great relevance and it decides the effects of their dealings. But at the same time it has got certain demerits or disadvantages as well. First of all the existence of a global language will make an elite monolingual linguistic class and they will have a dismissive and complacent attitude towards other languages. Moreover the accessibility of a common language will make the people lazy of learning other languages. They will be reluctant to utilize such an opportunity though they get a chance. Some times the global language can cause the disappearance for a minority language and it may belittle the necessity of such languages. Above all the practice of a sin gle language can be a threat to social harmony and mutual understanding. This has got historical evidence. The American civil war, the Spanish civil war, Vietnam War former Yugoslavia and contemporary Northern Ireland are

Nursing Leadership Paper Essay Example for Free

Nursing Leadership Paper Essay They have an open concept design, select menus, and our outside landscaping that allows their residents to enjoy a comfortable setting during either their short or long term stay. Their care is directed by an interdisciplinary team of professionals that includes a Medical Director, attending physicians, 24 hour licensed nurses, a dietary manager, activity director, social worker, and therapist for physical, occupational and speech rehabilitation. At Park Manor, the goal is to provide the care and services to meet the physical, emotional and social needs of each of our residents. I got to work with the MDS nurse, an MDS nurse is the nurse in the long term care facility who schedules and completes the RAI-Resident Assessment Instrument, a detailed assessment done at least quarterly on every nursing home resident. The MDS nurse is also usually responsible to coordinate the completion of the care plans for the resident based on the results of the assessment. We were collecting data from a whole bunch of sources; from the nurses, aides, resident, families, doctors, progress notes, therapy notes, etc. Then we completed the paper/computer MDS form based on our complete assessment (using the data collected). A RUG score (or resource utilization grouper) score is generated based upon our answers which is used to determine medicare/medicaide reimbursement rates for the facility. The MDS is used to create the care plan, determines reimbursement rates and determines quality measures/indicators per federal standards. State Surveyors pull these reports prior to inspection visits and to know who is losing weight and who may have pressure ulcers, etc.

the history about oxidation ponds

the history about oxidation ponds Introduction The most popular wastewater treatment is Oxidation ponds, which will produce an effluent meeting the recommended microbiological and chemical quality guidelines both at low cost and with minimum operational and maintenance cost. A low level of treatment is especially suitable in developing countries, not only from the point of view of cost but also in terms of the difficulty of operating complex systems. In many locations it will be better to design the reuse system to accept a low-grade of effluent rather than to rely on advanced treatment processes producing a reclaimed effluent which continuously meets a stringent quality standard. Oxidation ponds are now regarded as the method of first choice for the treatment of wastewater in many parts of the world. In Europe, for example Oxidation ponds are very widely used for small rural communities (approximately upto 2000 population but larger systems exist in Mediterranean France and also in Spain and Portugal). In the United States one third of all wastewater treatment plants are Oxidation ponds, usually serving populations up to 5000. However, in warmer climates (the Middle East, Africa, Asia and Latin America) ponds are commonly used for larger populations (upto around 1 million). In developing countries and especially in the tropical and equatorial regions sewage treatment by Oxidation ponds has been considered an ideal way of using natural processes to improve sewage effluents. Oxidation ponds, also called Waste Stabilization Ponds (WSP) or lagoons, are holding basins used for secondary wastewater (sewage effluents) treatment where decomposition of organic matter is processed naturally, i.e. biologically. The activity in the Oxidation ponds is a complex symbiosis of bacteria and Algae, which stabilizes the waste and reduces pathogens. The result of this biological process is to convert the organic content of the effluent to more stable and less offensive forms. Oxidation ponds are used to treat a variety of wastewaters, from domestic wastewaters to complex industrial waters, and they function under a wide range of weather conditions, i.e. tropical to arctic. They can be used alone or in combination with treatment processes. There are normally at least two ponds constructed. The first pond reduces the organic material using aerobic digestion while the second pond polishes the effluent and reduces the pathogens present in sewage. Sewage enters a large pond after passing through a settling and screening chamber. After retention for several days, the flow is often passed into a second pond for further treatment before it is discharged into a drain. Bacteria already present in sewage acts to break down organic matter using oxygen from the surface of the pond. Oxidation ponds need to be dislodged periodically in order to work effectively. There are three types of Oxidation Ponds which are, Anaerobic ponds Facultative ponds Maturation ponds Usually an Oxidation ponds system comprises a single series of the three ponds types. In essence, anaerobic and facultative ponds are designed for BOD removal (Biological Oxidation Demand) and maturation ponds for pathogen removal, although some BOD removal occurs in maturation ponds and some pathogen removal in anaerobic and facultative ponds. In many instances only anaerobic and facultative ponds are required. Anaerobic Ponds Anaerobic ponds are deep treatment ponds that exclude oxygen and encourage the growth of bacteria, which breaks down the effluent. Its in the anaerobic pond that the effluent begins breaking down in the absence of oxygen anaerobically. The anaerobic pond acts like an uncovered septic tank. Anaerobic bacteria break down the organic matter in the effluent, releasing methane and carbon dioxide. Sludge is deposited on the bottom and a crust forms on the surface as . Anaerobic ponds are commonly 2-5 m deep and receive such a high Organic loading (usually > 100 g BOD/m3 d equivalent to > 3000 kg/ha/d for a depth of 3 m). They contain an Organic loading that is very high relative to the amount of Oxygen entering the pond, which maintains anaerobic conditions to the pond surface. Anaerobic ponds dont contain algae, although occasionally a thin film of mainly Chlamydomonas can be seen at the surface. They work extremely well in warm climate (can attain 60-85% BOD removal) and have relatively short retention time (for BOD of up to 300 mg/l, one day is sufficient at temperature > 20oC). Facultative Ponds Facultative ponds (1-2 m deep) are of two types: primary facultative ponds, which receive raw wastewater and secondary facultative ponds, which receive settled wastewater (usually the effluent from anaerobic ponds). They are designed for BOD removal on the basis of a relatively low surface loading (100-400 kg BOD/ha d at temperature between 20 °C and 25 °C) to permit the development of a healthy Algal population as the Oxygen for BOD removal by the pond bacteria is mostly generated by Algal photosynthesis. Due to the Algae facultative ponds are coloured dark green, although they may occasionally appear red or pink (especially when slightly overloaded) due to the presence of Anaerobic purple sulphide-oxidizing photosynthetic bacteria. Algae populations within the aerobic pond require sunlight. They develop and produce oxygen in excess of their own requirements. It is this excess of oxygen that is used by bacteria to further break down the Organic matter within the effluent. The algal production of oxygen occurs near the surface of aerobic ponds to the depth to which light can penetrate. Oxygen can also be introduced by wind. This facultative condition occurs because high oxygen levels cannot be maintained to the total depth of aerobic ponds. So, a fully aerobic surface layer develops along with an aerobic/anaerobic intermediate layer, and a fully anaerobic layer on the pond bottom. Oxygen is unable to be maintained at the lower layers when, the pond is too deep and the colour is too dark to allow light to penetrate fully. The demand for oxygen in the lower layer is higher than the supply. Demand is increased with high levels of organic matter. The anaerobic layer will be deeper in an aerobic pond where there is an extremely high organic matter content of the inflowing effluent. The surface layer, rich in oxygen is not adequately mixed with the bottom layer. Maturation Ponds These ponds receive the effluent from a facultative pond and its size and number depends on the required bacteriological quality of the final effluent. Maturation ponds are shallow (1.0-1.5 m) m, and their entire volume is well oxygenated throughout the day. Their algal population is much more diverse than of facultative ponds. Thus, the algal diversity increases from pond to pond along the series. The main removal mechanisms especially of pathogens and faecal coliforms are ruled by algal activity in synergy with photo-oxidation. On the other hand, maturation ponds only achieve a small removal of BOD5, but their contribution to nitrogen and phosphorus removal is more significant. A total nitrogen removal of 80% in all waste Oxodation pond systems, which in this figure corresponds to 95% ammonia removal. It should be emphasised that most ammonia and nitrogen is removed in maturation ponds. However, the total phosphorus removal in maturation ponds system is low, usually less than 50%. Methodology And Its Evaluation As part of my report, I choose Waiwera Oxidation pond in Rodney District council. This pond has been designed for a population of about 1920 with the Orewa ponds. Septic tank sludge is not permitted in this ponds, there are two ponds operated in Waiwera, which are medium depth of 1.7m. This pond has flat clay bottoms and clay compacted with concrete wave barriers with a 25 degrees slope (1 in 2.1). Water is transferred between ponds through a submerged pipe and effluent is discharged to the Waiwera River with a submerged outlet. Council doesnt allow to discharge between 15th of December to 1st of February every year. So, the discharge outlet is shown in figure 4 and 5 below. Discharged Treated Water To Waiwera River These ponds are build on mangrove flats of the Waiwera River. The ponds have been operating since 1974 and the only problem occurred due to moribund blue-green algae. The ponds are operated as a primary pond, the smaller pond was used with estimated loading of only 36 kg BOD/ha day until 22nd December 1977, but when the larger pond became the primary pond the load then being approximately 21 kg BOD/ha day. In Waiwera Oxidation pond blue-green algae were Microcystis, aeruginosa and Anabaenopsis. In pond 1 green algae were only dominant during August to September 1977, when Chlorella was the most number in species, but during march to April 1978 when Actinastrum, hantzschii was the only dominant. While changing from pond 1 to the primary pond didnt appeared to affect the algal species. Which can be seen in figure 6 down below. Blue-Green Algae In Pond Green algae were dominant for more time in pond 2 rather than pond 1. During that time pond 2 was the primary pond. Selesnastrum minutum was a dominant for a short period in July 1977, then Chlorella and Micractinium pusillum then Actinastrum hantzschii during mid-November 1977 till mid-January 1978. Faecal coliform bacteria were in higher number in winter period, when the lower than usual removal in the pond. The remaining time removal rate was in excess of 90%, the counting ranged from 9 to 4300 MPN/100ml. The highest consistent removal rate was achieved between January and March 1978, when the detention time was highest. As seen in the above table 1, Oxidation pond water temperatures ranged from 10.4⠁ °C to 26.0⠁ °C. Dissolved Oxygen(D.O) concentrations in both ponds were usually close or over the saturation value except in low algal numbers. In tertiary pond, pH values varied throughout the year, being less than 9 units in the autumn and winter, and exceeding 10 units during times of high blue-green algal numbers in the spring and summer, the highest value recorded being 10.5 units. The chloride concentration in the Waiwera ponds was exceptionally high as a result of thermal water infiltration. The concentration fell each winter through dilution with storm water, the maximum value was 776 g/m3 in January 1978, and the concentration did not fall below 700 g/m3 until May. Biological Oxygen Demand (BOD) concentration varied, being less than 20 g/m3 for most of the year, rising to higher values particularly after Algal blooms. Inorganic-N concentrations were noticeably lower than in most other pon d systems, the ammonium-N concentration usually being around 1 g/m3 and the nitrate-N concentration, highest during winter, only being above 0.5 g/m3 in June/July 1977. The total non-filterable residue concentration was highest when dense blooms of Microcystis aeruginosa were present. The turbidity followed the algal count closely. Mineral water infiltration into the Waiwera ponds was implicated by the high lithium concentration being at least 25 times greater than in ponds not influenced by thermal waters, and 2.5 times greater than that in seawater. The high Na:K ratio of 38:1 also favours the thermal water (ratio 9:1). The sodium and chloride concentrations contributed by the thermal water (Na:635 g/m3; c1: g/m3) would be 203 g/m3 and 330 g/m3 respectively, leaving a difference of 75 g/m3 Na and 77 g/m3 C1 which is within the range expected from domestic sewage. Following in the Table 2 and Table 3 and graph 1 shows the Dominant Algae in pond 1 and pond 2 in 1977 and 1978. Order Of Dominant Algae In Waiwera Pond 1 In 1977 Scan And Paste It Order Of Dominant Algae In Waiwera Pond 2 In 1977 Scan And Paste It Efficiency Efficiency depending on the loading rate, temperature, BOD concentration, engineering details of the pond, and maintenance of the pond, particularly with respect to dislodging and crust control. So, the efficiency is quiet effective in that case proved by the above data. There are some advantages and disadvantages of the Oxidation ponds for smaller population area: Advantages Oxidation ponds will produce an effluent meeting, the recommended microbiological and chemical quality guidelines both at low cost with minimal operational and maintenance requirements. It costs low a level of treatment as possible is especially desirable in developing countries, not only from the point of view of cost but also in the difficulty of operating complex systems reliably. It makes the environment better as well as cleaning up the water. It deals a large amount of wastewater at same time. It utilizes the natural resource to help human beings and it can be used in low population. Disadvantages Oxidation ponds in some circumstances create insect and odours problems. But their main disadvantage for a small beach or lakeside community is the relatively large areas of flat land required conveniently located nearby. Impervious subsoils below the pond are necessary to prevent excessive loss by infiltration to the ground water, failing this an impermeable membrane must be laid to keep effluent from escaping through the base and sides of the pond. Lastly, the depth of the pond is not advised to be increased above 2.0 m as efficiency drops away which is more and it occupies large area. Conclusion The purpose of this report is to give a clear concept of the Oxidation Pond and its BOD level and Algae. As well as, the report provides a number of data of a real case in different year. Oxidation ponds require larger space and useful for developing countries and rural areas, where there is low population around 2000 3000. It is low capital treatment plant which is more economic. Oxidation pond treatment plants are considered useful because of their low capital costs, their easy to maintenance and their potentially longer life-cycles. Oxidation ponds proved to be one of the most efficient, high performance and low-cost Waste Water Treatment Technology used around the world. Oxidation pond water temperatures ranged from 10.4⠁ °C to 26.0⠁ °C during that time. There are many aspects of risk, so still need to take perfect steps while constructing the Oxidation pond or Stabilization ponds. They are pond embankment breach, erosion, flooding, noise, insect attraction etc. It would be better to take consideration to those elements when it is designed. Acknowledgements The data for this research was provided by Rodney District Council, New Zealand. The assistance of the staff involved, to arrange time to visit the site. And thanks to Glenys Rule, who took me the site visit, gave me some site maps and photos and the excellent advice. Special thanks to Babar Mahmood (Course coordinator of this course, Senior Lecturer, Programme Director for BE and Programme Coordinator for BEngTech (Civil) Programmes) for giving me this chance to learn about the Oxidation pond. References https://www.iwk.com.my/sewerage-fact-02-04.htm http://www.sciencedirect.com/science?_ob=ArticleURL_udi=B6V73-3VGK7KC-2H_user=2486523_rdoc=1_fmt=_orig=search_sort=dview=c_acct=C000057528_version=1_urlVersion=0_userid=2486523md5=0c94a848bdfe4328b42e75fe3f162b14 Abis, Karen L. (2002). The performance of facultative waste stabilization ponds in the United Kingdom. Ph.D. thesis, U.K. University of Leeds. â€Å"Loan Proposal for Sewage Treatment and Disposal for Waiwera,† Waitemata County Council â€Å"A survey of Oxidation Ponds in Auckland Region,† Auckland Regional Authority, works division 1979 http://www.irc.nl/page/8237