Ultrafiltration Process :: ultrafiltration nanofibrous membranes

What exactly do we mean by Ultrafiltration, and for what processes can it be used? Ultrafiltration is a process by which one uses a pressure-driven process utilizing a specific-sized membrane to separate macromolecular weights of a solution, allowing the transfer of the low molecular weight (permeate). Ultrafiltration is exclusively defined by the pore size range (0.1 – 0.001 microns) (Dhawan). Ultrafiltration is used in a wide array of applications, such as food and beverage, chemical, pharmaceutical, medical, drinking water, wastewater and etc. This research review will focus on industrial applications, and transport processes that make ultrafiltration unique, as well as the industry standard for separation. The rapid development of ultrafiltration for industrial processes is possible by the advent of anisotropic, high-flux membranes capable of distinguishing among molecular sizes of 10 A to 10  µ size ranges (Porter, 1972). The high molecular solute which flows through, but does not pass through the membrane is released as retentate (concentrate). The solution that passes through the membrane is known as permeate, which is shown Figure 1. This figure demonstrates the basic structure of a hollow membrane where the feed of the material you want to separate enters, and where the permeate (ultrafiltrate), and retentate exits. In different industrial processes one may want to retain the permeate, retentate, or combination of both. Mass Balance, Momentum Balance and Flux Figure 1: Flows and fluxes in a hollow fiber for ultrafiltration (Yeh, 2009) Let us take a closer look at what drives ultrafiltration from a mathematical point of view. In Figure 1, the feed solution is being driven by a volumetric flow rate (qi/Ni), pressure (∆Pi), and concentration (Ci). This feed solution produces a mass balance which results in the flux (J) vs fiber (dz): (Yeh, 2009) The momentum balance must be accounted for also: (Yeh, 2009) It can be presumed that the volumetric flow rate will be reduced similarly to the Hagen–Poiseuille equation, due to the laminar flow within the tube in Yeh, H. experiment in 2009, he takes into account convection as well as mass, and momentum balance: (Yeh, 2009) Equation 3 assumes that the volumetric flow rate is relatively large compared to that of the permeation rate. This occurs mainly in an exponential model along the membrane tube. This model simply states that when working with a pressure-drive ultrafiltration process, as pressure is increased, a ceiling (limiting) flux will occur regardless of increasing the pressure. We know that the relationship between membrane pressure (∆Ï ) and the permeate flux leads us to the following conclusion (Yeh, 2009).

Illusions of Reality Essay -- essays research papers

The Illusions of Reality The only thing in my life that I can be positive about is change. Everything changes, from the moment we’re born to the moment we die. Reality has many twist and turns, and our perception of reality is what shapes us to become who we are. Our life is spent on deciphering the difference between reality and not reality. This is hard to define because reality is unique to each individual. Our environment and the people we are around shape our perception of what is real. Reality is our grip of what is true and false, right and wrong, what is real and what is not. So reality can be distorted by our belief in it. We can sincerely believe something is right, but be sincerely wrong.   Ã‚  Ã‚  Ã‚  Ã‚  The foundations of thought and imagination are laid at a very young age. Reality for the deaf and blind is that nothing exists outside of their perception. They do not yet understand object permanence, that even though an object goes out of sight, it still exists. Many children develop this knowledge around the ages of four to eight months old. I was a late bloomer; I did not acquire this until later.   Ã‚  Ã‚  Ã‚  Ã‚  When I was five years old, I was terrified of being left alone. I was afraid to ever be by myself. I had to be around other people or I would have panic attacks. Our dogs somehow had gotten out of our backyard. My mom, my sister and I got in the car and drove around the neighborhood looking for the dogs. My mother drove by our house to check if they had got back yet. My mom told me to see if the front door was unlocked. As I was walking across the front lawn, she drove away. When I was walking towards the house I didn’t hear my mom tell me that she was going around the block and that she’d be right back. To say the least, I panicked. I remember running down the dusty dirt road after her brown jeep thinking that my mom left me and would never see her again. Feelings of fear and abandonment filled my body, and I ran down to the highway screaming with tears streaming down my face. When I finally got to the highway I sat down and started to sob. A lady i n a blue car pulled over and asked me what was wrong. She was concerned so she had me get in the car and drove me to my house. We sat there in the car together until my mom came back home. My mom thanked the lady for being so kind, grabbed my arm and pulled m... ...were destitute, living in barely livable shacks. It showed me how rich I was. They were starving. Not only physically, but spiritually as well. These people had never been showed the truth that the Bible held, or the hope it could bring to their lives. I had never been exposed to this type of living in my life. It made me think about everything differently. I became much more thankful and giving. I was a spoiled brat when I went, but returned changed and unselfish. I changed for myself. At that stage in my life I realized how much I have, and how much I took for granted. I did not like who I was or where I was going, so I changed. I was changed as much as Mexicalli was changed. There are many points in my life that, when I look back on them, I will have noticed a change that was made. Whether it is when I accepted the Jesus into my life, or experienced a drug for the first time. We shall all be that way. What I’m experiencing right now is real and tangible to me, but maybe I will look back on this time of my life someday and realize that this reality was just a step to another, and that reality another step, then another. What we are experiencing now will eventually be a memory.

Essay on Facing the Consequences in King Lear -- King Lear essays

King Lear:   Facing the Consequences      Ã‚  Ã‚  Ã‚   Shakespeare's tragedy King Lear is a detailed description of the consequences of one man's decisions.   This fictitious man is Lear, King of England, whose decisions greatly alter his life and the lives of those around him.   As Lear bears the status of King, he is, as one expects, a man of great power.   But, sinfully, he surrenders all of this power to two of his daughters, as a reward for their demonstration of love towards him.   This untimely abdication of his throne results in a chain reaction of events that sends him on a journey toward Hell, in order to expiate his sin.   Ã‚  Ã‚  Ã‚     Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   As the play opens one can almost immediately see that Lear begins to make mistakes that will eventually result in his downfall.   The very first words that Lear speaks in the play are:    Give me the map there. Know that we have divided/ In three our kingdom, and 'tis our fast intent/ To shake all cares and business from our age, / Conferring them on younger strengths while we/ Unburdened crawl to death. (I.i.38-41)       This gives the reader the first indication of Lear's intent to abdicate his throne.   He goes on further to offer parcels of his kingdom to his daughters as a form of reward for passing his test of their love:    Great rivals in our youngest daughter's love, / Long in our court have made their amorous sojourn, / And here are to be answered. Tell me, my daughters/ (Since now we will divest us both of rule, / Interest of territory, cares of state), / Which of you shall we say doth love us most? / That we our largest bounty may extend/ where nature doth with merit challenge. (I.i.47-53)   Ã‚  Ã‚      The most signif... ...      Ã‚  Ã‚     Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚     All of this suffering that Lear endures can be traced back to the single most important error that he made, the decision to give up his throne.   This sin has proven to have massive repercussions upon the life of Lear and the lives of those around him, eventually leading to the deaths of almost all who were directly involved with his abdication.   After following Lear’s demise which was brought on by a single wrong turn, one cannot help but wonder what difficult corners lie ahead that may cause similar alterations in one’s own life.    Works Cited    Bloom, Harold.   Shakespeare: The Invention of the Human.   New York:   Penguin Putnam, 1998.    Boyce, Charles.   Shakespeare A to Z.   New York:   Roundtable Press, 1990.      Shakespeare, William.   King Lear.   Eric A. McCann, ed. Harcourt Brace Jovanovick.            

San Francisco Public Utilities Commission Preserves Expertise with Better Knowledge Management

Case 2: San Francisco Public Utilities Commission Preserves Expertise with Better Knowledge Management 1. What are the business goals of SFPUC? How is knowledge management related to those goals? SFPUC is a department of the city and county of San Francisco that provides water, wastewater, and municipal power services to the city.SFPUC’s Power division provides electricity to the city and county of San Francisco, including power used to operate electric streetcars and buses; the Regional and Local Water departments supply some of the purest drinking water in the world to San Francisco and neighboring Santa Clara and San Mateo counties; and the Wastewater division handles flushed and drained water to significantly reduce pollution in the San Francisco Bay and Pacific Ocean.The mission of this organization is to provide San Francisco and its Bay Area customers with reliable, high-quality, affordable water and wastewater treatment while efficiently and responsibly managing human, physical, and natural resources. SFPUC met these challenges by implementing a business process management (BPM) and workflow solution from Interfacing Technologies Corporation to drive change efforts across the organization. The system, called Enterprise Process Center, or EPC, manages knowledge retention and establishes new ways of collaborating, sharing information, and defining roles and responsibilities.EPC solved that problem by creating work order flows for all tasks performed within the organization, defining the employee roles and responsibilities for each. They will not search for files everywhere, just type it in the search box and one can view it. It makes employees working easier. 2. What were some of the challenges faced by SFPUC? What management, organization, and technology factors were responsible for those challenges?The two major challenges SFPUC faced were successfully capturing, managing, and transferring this knowledge, and maintaining reliability and accountab ility despite a large influx of new workers. SFPUC expected that a significant portion of its employees—about 20 percent—would retire in 2009. To make matters worse, the majority of these positions were technical, which meant that the training of new employees would be more complicated, and maintaining knowledge of the retiring workers would be critical to all areas of SFPUC’s business processes. . Describe how implementing EPC improved knowledge management and operational effectiveness at SFPUC. With EPC, SFPUC would be able to maintain continuity from older to newer employees more easily. SFPUC was impressed that the system would span all four of its major divisions, helping to standardize common processes across multiple departments, and that it would be easy to use and train employees. 4. How effective was EPC as a solution for SFPUC?SFPUC management had anticipated that eliminating outdated tasks would have the added effect of keeping employees happy, which would help SFPUC’s performance by delaying retirement of older employees and increasing the likelihood that newer hires stayed at the company. EPC allowed employees to provide feedback on various tasks, helping to identify tasks that were most widely disliked. EPC helped SFPUC take its baby boomers’ individual data and knowledge and turn them into usable and actionable information that was easily shared throughout the firm. SFPUC stayed much further under budget than other comparable governmental organizations.

How Far Was the Russo-Japanese War of 1904-1905?

How far was the Russo-Japanese War of 1904-1905, responsible for the outbreak of the 1905 Revolution? The Russo- Japanese War, although an important rationale for the outbreak of the 1905 Revolution , was caused by many other problems which made a foundation for the War as well as the Revolution. Due to the War the economy suffered, adding on to the problems that Russia was already facing from a lack of preceding modernization, making this very important as the majority were affected causing them to revolt.Furthermore, Russia lost against Japan in the War portraying the Tsar as weaker compared to how he was already viewed by the population, making this another very important factor as the Russians felt they needed a stronger leader and in distress turned to extremist political parties. In addition another important factor is, the extremist parties in particular, felt that the autocratic rule of the Tsar was causing Russia to suffer, seeing that the people were not being heard resulti ng in them gaining extremist views and rebel.The Russo- Japanese War was a short term factor, which was only partly responsible for the outbreak of the Revolution. The Russian military lost miserably to the Japanese and this was a huge blow to the Russians as due to censorship, they had always conceived the Japanese to be inferior and weaker, making them certain that they would win. The defeat was seen as national humiliation, helping to cause unrest towards the Government and making the Tsar look weak, giving encouragement to the revolutionaries.In addition the overall cost of the War was very high, meaning that the already suffering Russian economy was plummeted further into trouble resulting in the tarnishing of the state finances made by Witte. However, it mainly helped to prolong the Revolution as many of the events of the war took place after the Revolution had begun. Long before the Russo-Japanese War had begun, Russia was still facing Economic turbulences and this is one of the main contributors to the outbreak of the Revolution.A revolt by the Peasants who were discontent due to only small individual plots for each family being distributed and bad harvests meant that there was massive industrial growth, resulting in an economy boom and building expectations of a better life for peasants . An industrial ‘slump’ caused social discontent of economic misfortune as Russian peasants and workers forced the uncertainty of poverty and poor living conditions. This caused major resentment to the Tsar both in industry and agriculture with his social and economic regime.In addition, due to Russia being backwards, even under Witte the Russian economy had failed to reach or exceed the output in production of goods as the other Great Powers although being the largest continuous land Empire. The low production in goods meant that Russia’s trade also suffered. The overall state of the economy meant many problems which were causing much unrest such a s poor living conditions were left unresolved and the resentment towards the Tsar continued to grow. Russia was under autocratic rule and this is also one of the main contributors to the outbreak of the 1905 Revolution.Autocratic rule was disliked by many as many people believed that under the Autocratic rule Russia was suffering and there needed to be a change in the way the country was led in order for the country to progress. This caused many political groups to gain extremist views. The extremist groups such as the Social Revolutionaries became very popular as they wanted to give political power to the peasants, who made up 80% of the total population and solving their problems would mean that the whole of Russia would benefit greatly.This shows that the groups were becoming more organized and strategic in the way they worked as they were targeting the biggest problems, in addition in order to gain publicity and get their message and views across, political groups were responsib le for over 2000 assassinations which included the Interior Minister, Plehve and the Tsars Uncle, Grand Duke Sergei, the Governor of Moscow.Furthermore, the demand for political reform continued growing as just like the Russian economy, Russian politics was also backwards and unlike other European states, Russia had elected bodies being the Zemstva, instead of an elected national parliament. This meant that the Russian population had no say in how the country was run which angered many and in turn meant that they supported extremist political groups in an attempt to force political change. Alexander ii’s reforms were also partly responsible for the outbreak of the War.Although the Emancipation of Serfs Act was passed in 1861,the peasants were still not completely free as they could not leave their villages without permission from the elders. The fact that they also had to pay redemption payments for 49 years added to their animosity towards the Tsar. In addition, landowners h ad to sell their land to the Government, meaning that they were in great debt and like the peasants their resentment towards the Tsar continued to grow. Due to Russia’s economical state many of these problems continued to grow as did the resentment.The weaknesses of Nicholas ii, although not as important as the other factors such as economic and political, also influenced the outbreak of the Revolution. As Russia was under autocratic rule, the majority needed to be under his control. This was very hard for Nicholas as he was very shy and timid, not qualities the Russians admired in their leader. His image was also affected by events such as the Russo-Japanese War as the result meant that Russia’s pride was damaged. Bloody Sunday also affected how he was viewed by his Country as he had been accused on turning against his own people.It was also said that he had no political knowledge, which many people blamed for Russia’s turbulences. Therefore people saw him unfi t to rule. Bloody Sunday was only minutely responsible for the outbreak of the Revolution as it was merely a spark. Although it was only a short term cause it had a damaging effects that angered many. Although the Tsar was not present at the time it still harmed his popularity as he was no longer the ‘Little Father’ who was on their side and would listen to them if they petitioned.He had destroyed the trust causing them to revolt. In conclusion, the Russo- Japanese War, although important as it highlighted and added to many of the issues already present in Russia, was merely a factor that prolonged the Revolution. The most important factors were the Economical and Political, as they showed Russia’s latent issues whereas the War made people more aware. The Russo- Japanese War itself was a problem that helped merely to prolong a revolution that would have occurred even without it.

A reason why international diversification increases

International diversification can be understood as the expansion of a firm Into different countries and geographical regions. This expansion offers firms various advantages like the exploitation of opportunities aboard, economies of scale, sharing of core competencies, and learning. Learning is a key factor of the efficient development of new capabilities. Learning itself is fostered by diverse experiences. This shows the connection to International diversification, hence operating in diverse environments (countries/geographical regions) Increases the Intensity and frequency f events and Ideas to which a firm is exposed.Anyway, it Is questionable whether learning through diverse experiences leads ultimately to capabilities that increase profit of a international diversified firm. To assess this question I am going to emphasize a few arguments that support and contradict this statement. On the one hand, managers and workers who have experiences In diverse environments are more product ive than employees who don't have such experiences. This is mainly because these employees have a broader range of experiences and an spot and solve problems more easily than employees with a narrow view.Furthermore, an organization that operates in several countries has a wide range of subsidiaries from that it can learn. These subsidiaries provide access to a wide range of new ideas and new practices that give rise to innovation and lead to increased technological capabilities. In addition, firms which remain In their domestic country as well as In their mall Industry face similar threats and opportunities and develop ordinary methods to handle them. Thus, they have relatively narrow experiences and heir methods and capabilities also tend to be narrower because they face a limited set of challenges.These limitations won't affect the firm in the short term but I believe that it decreases the performance of the firm in the long run. On the other hand, firms that seek to enter a fore ign market tend to start with cultural close countries at first. As these firms become experienced, they begin to expand in cultural distant markets. Thus, many firms don't face such great learning opportunities because they prefer cultural close countries which are similar to their mom country.Furthermore, firms don't have to be internationally diversified to encounter learning opportunities. It is also possible to learn from foreign suppliers or foreign customers. Therefore, one crucial aspect Is how learning processes are Implemented and lived In organizations. This depends, among other things, on how the firm and its subsidiaries are organized. A firm that leads its subsidiaries/ geographical regions/product divisions as a strategic holding exploits less learning opportunities because it manages its subsidiaries just by financial indicators.In entrant, if a firm manages its subsidiaries as an operative holding it intervenes in the day-to-day business to seize synergies and learn ing opportunities. Hence, cross- border learning has to overcome organizational constrains. That international diversified firms face more possibilities to learn and develop new capabilities that increase profitability but this doesn't imply that they always outperform non international diversified firms. International diversified firms have to create settings that facilitate and nurture cross-border learning to exploit the diverse opportunities they face in foreign countries.

Phosphine gas general info

Health Cl Extremely flammable Cl Very toxic by inhalation: syrnptoms usually occur within a few hours of exposure D Phosphine is irritating to the mucous membranes of the nose, mouth, throat and espiratory tract 0 Inhalation may result in weakness, chest tightness and pain, dry mouth, cough, sickness, vomiting, diarrhoea, chills, muscle pain, headache, dizziness, ataxia, confusion and lung damage. These symptoms may develop 2-3 days after exposure 0 Severe poisoning may result in increased heart rate, low blood pressure, convulsions, coma, heart damage and death.These symptoms usually within 4 days but may be delayed up to 1-2 weeks C] Exposure to the eyes or skin may cause Irritation 0 Long-term exposure may cause anaemla, bronchltls, gastrointestinal disorders, peech and motor problems, toothache, weakness, weight loss, swelling and damage of the jaw bone and spontaneous fractures 0 Phosphine has not been associated with cancer 0 Phosphine is not likely to cause reproductive or dev elopmental effects Environment 0 Dangerous for the Environment 0 Inform Environment Agency of substantial release incidents Prepared by L Assem & M Takamiya Institute of Environment and Health Cranfield University 2007 Version 1 Background Phosphine is a colourless gas, which is slightly heavier than air.It usually smells of garlic or rotting fish due to the presence of ontaminants but pure phosphine is odourless. is extremely flammable and highly reactive with air, copper and copper-containing alloys. exposed to higher levels of phosphine, although occupational incidents involving exposure to phosphine are rare, and safety levels are in place to protect employees. Phosphine is rarely found in nature. Small amounts can be formed during the breakdown of organic matter, although it is rapidly degraded. Phosphine is released into the air via emissions from various manufacturing processes and from the use of metal (magnesium, aluminium and zinc) phosphide umigants and pesticides, which release phosphine on contact with water or acid.The major uses of phosphine are as a fumigant during the storage of agricultural products such as nuts, seeds, grains, coffee and tobacco, and in the manufacture of semi-conductors. Phosphine is also used in the production of some chemicals and metal alloys and is an unintentional by-product in the illegal manufacture of the drug methamphetamine. Inhalation is the most likely route of exposure to phosphine, although ingestion of metal phosphides may also occur. Symptoms are non-specific and include irritation of the espiratory tract, headaches, dizziness, abdominal pain, sickness, and vomiting. convulsions, damage to the lungs, heart, liver and kidney, and death. Long-lasting effects of single dose exposure are unlikely, most symptoms clearing within a month.Long-term exposure to phosphine, while unlikely to occur, can cause bronchitis, gastrointestinal, visual, speech and motor problems, toothache, swelling of the Jaw, anaemia and spo ntaneous fractures. Children exposed to phosphine will have the same symptoms of poisoning as adults. Phosphine is not likely to cause harm to the nborn child as acute effects are not known to cause developmental effects. Phosphine is rapidly broken down in the environment and it is very unlikely that the general population will be exposed to sufficient levels of phosphine to cause health effects. However, people may be exposed to very small amounts of phosphine present in air, food and water. Phosphine has not been associated with cancer and has not reviewed by the International Agency for Research on Cancer.Workers employed as fumigators, pestcontrol operators, transport workers and those involved in the production or use of hosphine and metal phosphides (welding, metallurgy, semi-conductors), may be General information: Page 2 of 5 PHOSPHINE – GENERAL INFORMATION Production and Uses Phosphine is present in emissions from some industrial processes such as the manufacture of some chemicals and metal alloys of metal phosphides) and as a catalyst and in the production of polymers The main uses of phosphine are as a chemical dopant in the manufacture of semiconductors for the electronics industry, and in the fumigation (in the form of metal phosphides) of stored agricultural products such as cereal grains and tobacco. Phosphine is also used as a condensation catalyst and in the manufacture of some polymers. Zinc phosphide is used as a rodenticide in the form of a pellet or as a paste mixed with food. Small amounts of phosphine are produced in the production of chemicals such as phosphonium halide and acetylene gas. General information: Page 3 of 5 Frequently Asked Questions What is phosphine? Phosphine is a colourless gas which is highly flammable and explosive in air.Pure phosphine is odourless, although most commercially available grades have the odour of garlic or decaying fish. Small amounts of phosphine can occur naturally, formed uring the anaerobic degradation of organic matter. Phosphine is corrosive towards metals, in particular copper and copper-containing alloys. What is phosphine used for? A major use of phosphine is as a semi-conductor doping agent by the electronics industry. Metal (aluminium, magnesium and zinc) phosphides, which release phosphine on contact with moisture and acid, are used as rodenticides and fumigates during storage of agricultural commodities such as grain e. g. cereals, and tobacco. Phosphine is also used as a catalyst and in the production of polymers.How does phosphine get into the environment? Small amounts of phosphine occur naturally during the decomposition of phosphorouscontaining organic matter e. g. in marsh gas. Emissions and effluents from the manufacture of some chemicals and metal alloys, as well the production or use of phosphine and metal phosphides (welding, metallurgy, semi-conductors, rodenticides and fumigants), release phosphine into the air. How will I be exposed to phosphine? It is unlikely that the general population will be exposed to significant amounts of phosphine, since it is degraded quickly in the environment; the half-life of phosphine in the air is about one day or less.However, people may be exposed to very small amounts by inhaling air, drinking water and eating food containing phosphine. Workers involved with industries and processes where phosphine is used, e. g. fumigation and pest control, may be exposed to higher levels of phosphine. People living nearby sites where phosphine is being used may also be exposed to small amounts of phosphine in the air. Phosphine gas does not present a risk of secondary contamination, although solid phosphides may pose some risk. Absorption though the skin is not considered a significant route of exposure. If there is phosphine in the nvironment does not always lead to exposure. Clearly, in order for phosphine to cause any adverse health effects you must come into contact with it.You may be exposed by brea thing, eating, or drinking the substance or by skin contact. Following exposure to any chemical, the adverse health effects you may encounter depend on several factors, including the amount to which you are exposed (dose), the way you are exposed, the duration of exposure, the form of the chemical and if you are exposed to any other chemicals. Exposure to phosphine or metal phosphides can be irritating to the respiratory tract nd can cause weakness, chest pain and tightness, dry mouth, cough, sickness, vomiting, diarrhoea, chills, muscle pain, headache, dizziness, ataxia and confusion. Severe cases may lead to lung damage, convulsions, damage to the heart, liver and kidney, and death.General information: Page 4 of 5 Long-term exposure to low levels of phosphine can cause anaemia, bronchitis, gastrointestinal problems, visual, speech and motor problems, toothache, swelling of the Jaw and spontaneous fractures. Can phosphine cause cancer? The Governmental Committee on Mutagenicity rec ently reviewed the available data n carcinogenicity of phosphine and concluded that it did not cause cancer in animal studies. Phosphine has not been reviewed by the International Agency for Research on Cancer (‘ARC), and the US Environmental Protection Agency (US EPA) considers phosphine as not classifiable as to human carcinogenicity, due to inadequate animal studies and a lack of human tumour data. Does phosphine affect children or damage the unborn child?Children who ingest metal phosphides or inhale phosphine gas are expected to have similar symptoms as adults, e. g. sickness, vomiting, headache, dizziness, in severe ases leading to damage to the lungs, heart, liver and kidney and death. There is no evidence to suggest that maternal exposure to phosphine affects the health of the unborn child. What should I do if I am exposed to phosphine? It is very unlikely that the general population will be exposed to a level of phosphine high enough to cause adverse health effects. T his document from the HPA Centre for Radiation, Chemical and Environmental Hazards reflects understanding and evaluation of the current scientific evidence as presented and referenced in this document.