نتایج جستجو برای: the second option involves sand tank automatic disc filter
تعداد نتایج: 16148345 فیلتر نتایج به سال:
Engineering enhancement of slow sand filtration has been an enigma in large part because the mechanisms responsible for particle removal have not been well characterized. The presumed role of biological processes in the filter ripening process nearly precluded the possibility of enhancing filter performance since interventions to enhance biological activity would have required decreasing the qu...
according to webster and wind (1972) and anderson et al (1987), “organizational buying is a complex process and involves many people from different functional areas, multiple goals and potentially conflicting decision criteria. moreover, the customers of today are also more knowledgeable and selective when making their purchasing decisions. since a key to organizational survival is the retentio...
in this thesis a calibration transfer method is used to achieve bilinearity for augmented first order kinetic data. first, the proposed method is investigated using simulated data and next the concept is applied to experimental data. the experimental data consists of spectroscopic monitoring of the first order degradation reaction of carbaryl. this component is used for control of pests in frui...
Abstract Sea cucumbers live in ponds and coastal with different salinity. This study aims to determine the range of salinity support growth survival sea cucumber juveniles. The research container used was a transparent fiberglass tank capacity 30 L as many 8 tanks. juveniles were 4 individuals /tank an average size between 55-68 mm. Each equipped plastic bottle filled coral fragments white sand...
abstract: the present thesis includes ; one preface and 11speeches , that each speech considered in different researches . the prefact part , studied grammer back ground , the first speech considered a brief description about grammatical credits . the second speech considered the different typs of sentences , from structure and meaning points of view . the third speech considered the verb es...
abstract disc infiltrometer is one of those devices that used in recent years in measurement of hydraulic conductivity of entire soil. in order to analyze the data taken by disc infiltrometer a variety of methods based on wooding’s base analyze have been introduced. the objective of this study was to compare the performances of ankeny and weir methods for predicting soil hydraulic properties us...
Recent research has demonstrated that the approximately 360,000 septic tank/leaching systems and cesspools that serve 74% of homes across Suffolk County have caused the concentrations of nitrogen in groundwater to rise by 50% since 1985. This nitrogen-enriched groundwater is flowing into sensitive coastal environments where it has contributed to toxic algal blooms, oxygen-deprived waters, the l...
in this thesis, using concepts of wavelets theory some methods of the solving optimal control problems (ocps). governed by time-delay systems is investigated. this thesis contains two parts. first, the method of obtaining of the ocps in time delay systems by linear legendre multiwavelets is presented. the main advantage of the meth...
When Can We Lift the Coronavirus Pandemic Restrictions? Not Before Taking These Steps. The American Enterprise Institute, a public policy think tank, recently released a report co-written by former U.S. Food and Drug Administration commissioner Scott Gottlieb that offers a four-phase “road map to reopening.” The first phase involves slowing the spread of new infections with physical distancing ...
Laboratory column studies were conducted at the Utah Water Research Laboratory, Logan, Utah, to evaluate reovirus removal from drinking water supplies by slow-rate sand filtration (SSF). Columns, constructed to simulate a full-scale SSF field operation, were inoculated with reovirus at ca. 1,000-times-greater concentrations than those typically found in domestic sewage. Reovirus removal and ina...
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