Xem 1-19 trên 19 kết quả Filtration of water
  • Availability of fossil fuels became readily and abundantly available during the mid to latter part of the 20th century, and building design responded with mechanical and electrical systems that in many instances consumed the fuel excessively. Large single glazed areas caused over-heating, glare and solar discomfort in the summer, combined with cold draughts and high heat losses in the winter. Thermostatic control was often rudimentary and compensated by opening and closing windows accordingly.

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  • Microbial contamination of drinking-water contributes to disease outbreaks and background rates of disease in developed and developing countries worldwide. Control of waterborne disease is an important element of public health policy and an objective of water suppliers. The World Health Organization (WHO) has developed Guidelines for Drinking-water Quality.

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  • (BQ) Part 1 book "Renal physiology" presents the following contents: Physiology of body fluids, structure and function of the kidneys, glomerular filtration and renal blood flow, renal transport mechanisms - nacl and water reabsorption along the nephron, regulation of body fluid osmolality - regulation of water balance, regulation of extracellular fluid volume and nacl balance.

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  • Difficulty in accessing ground water without disturbing ground-water flow patterns, chemistry, microbiology, and the physical and chemical makeup of formation materials has made accurate characterization of in situ ground-water conditions a very challenging task.

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  • Electrokinetics is a subject that has been at the core of numerous fundamental advancements in the field of colloid science for over a century. Electrokinetics is a self-contained body of science that has led to spectacular applications in separations, characterization of surface properties, manipulation of colloidal materials, and facilitation of fluid transport in microchannels. For instance, electrophoresis is one of the common techniques for separation of biological macromolecules (such as proteins).

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  • Organic carbon concentrations can be reduced by enhanced coagulation, granular activated carbon or membrane filtration, but this fact can also lead to increased in brominated THMs (Black et al, 1996.). A combination of coagulation, ozonation, and biofiltration can effectively reduce trihalomethane and haloacetic acid formation potential (Chaiket et al, 2002.). Natural organic matter (NOM), the main precursor of DBPs, can also be removed by media filters coated with iron oxide

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  • The removal of suspended matter from water is one of the major goals of water treatment. Only disinfection is used more often or considered more important. In fact, effective clarification is really necessary for completely reliable disinfection because microorganisms are shielded by particles in the water. Clarification usually involves: • coagulation • flocculation • settling • filtration This guide focuses on coagulation and flocculation: the two key steps which often determine finished water quality....

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  • Approach to the patient with polyuria. ATN, acute tubular necrosis; ADH, antidiuretic hormone Excessive filtration of a poorly reabsorbed solute such as glucose, mannitol, or urea can depress reabsorption of NaCl and water in the proximal tubule and lead to enhanced excretion in the urine. Poorly controlled diabetes mellitus with glucosuria is the most common cause of a solute diuresis, leading to volume depletion and serum hypertonicity. Since the urine Na concentration is less than that of blood, more water than Na is lost, causing hypernatremia and hypertonicity.

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  • Glycoconjugates are distributed on the cell surfaces of some small-sized treponemes and have been reported to be com-pletely different from lipopolysaccharides. We separated a glycoconjugate fraction fromTreponema mediumATCC 700293, a medium-sized oral spirochete, to assess its immu-nobiological activities and elucidate the chemical structure of its polysaccharide part using phenol/water extraction, hydrophobic chromatography, and gel filtration.

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  • Chlorination is an excellent way to effectively treat your farm water. However, chlorination will only be effective if the water is already relatively free of organic matter and solids. Filtration of the water supply prior to chlorination will nearly always be necessary. There are a number of different chlorination systems available to poultry farmers. These can be obtained from a range of specialist water treatment companies, pumping companies or swimming pool suppliers.

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  • International standard ISO 16266 presents about Water quality — Detection and enumeration of Pseudomonas aeruginosa — Method by membrane filtration. It includes Normative references, Terms and definitions, Apparatus and glassware.

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  • The following mechanisms are involved. Glomerular filtration. The rate at which a drug enters the glomerular filtrate depends on the concentration of free drug in plasma water and on its molecular weight. Substances that have a molecular weight in excess of 50 000 are excluded from the glomerular filtrate while those of molecular weight less than 10 000 (which includes almost all drugs)21 pass easily through the pores of the glomerular membrane. Renal tubular excretion. Cells of the proximal renal tubule actively transfer strongly charged molecules from the plasma to the tubular fluid.

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  • The chemistry of fine organic intermediates and products shows an enormous diversity. But in reality, the number of operations/processes used remains reasonably small. These include charging/discharging of reactants and solvents, inertisation, reactions, crystallisations, phase separations, filtrations, distillation, product washing. In many cases cooling, heating, or the application of vacuum or pressure is necessary. The unavoidable waste streams are treated in recovery/abatement systems or disposed of as waste.

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  • Sorption is a process by which chemicals or organisms become attached to soils and/or the geologic rock material (aquifer solids) and removed from the water. Often the sorption process is reversible and solutes desorb and hence dissolved-solute plumes are retarded, rather than solutes being permanently retained by the solids. Cation exchange is the interchange between cations in solution and cations on the surfaces of clay particles or organic colloids. Filtration is a process that affects particulate contaminants (e.g.

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  • There's a great deal of excitement surrounding the use of Linux in embedded systems -- for everything from cell phones to car ABS systems and water-filtration plants -- but not a lot of practical information. Building Embedded Linux Systems offers an in-depth, hard-core guide to putting together embedded systems based on Linux

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  • · Valuation of environmental assets, goods, or services. "Valuation" refers to the process of deriving a monetary value for things which are not sold in a market; for example, fuelwood gathered in the forest, water filtration provided by a wetland, or biodiversity resources which could provide new medicines in the future. Valuation is an essential input into both social cost-benefit analysis and some approaches to environmental accounting. However valuation is only one element in the construction of environmental accounts; it is not the same as the construction of the accounts.

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  • Sequence of events leading to the formation and retention of salt and water and the development of edema. ANP, atrial natriuretic peptide; RPF, renal plasma flow; GFR, glomerular filtration rate; ADH, antidiuretic hormone. Inhibitory influences are shown by broken lines. Incomplete ventricular emptying (systolic heart failure) and/or inadequate ventricular relaxation (diastolic heart failure) both lead to an elevation of ventricular diastolic pressure.

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  • · Non-marketed goods. The environment provides many goods which are not sold, but which are nevertheless of value; e.g., fuelwood and building materials gathered in forests, meat and fish captured for consumption, and medicinal plants . Some countries do include these in their national income accounts, estimating total consumption, and then using market prices for comparable products as a proxy to calculate the value of non- marketed goods. However, such estimation is incomplete, and cannot always be disaggregated from products which are sold. · Non-marketed services.

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  • Endothelin This potent peptide vasoconstrictor is released by endothelial cells; its concentration is elevated in heart failure and contributes to renal vasoconstriction, Na+ retention, and edema in heart failure. Natriuretic Peptides Atrial distention and/or a Na+ load cause release into the circulation of atrial natriuretic peptide (ANP), a polypeptide; a high-molecular-weight precursor of ANP is stored in secretory granules within atrial myocytes.

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