نتایج جستجو برای: such as turbidity

تعداد نتایج: 5964474  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1390

abstract ion selective electrodes (ises) are electrochemical sensors that respond selectivity to the activity of ionic species. an ion-selective electrode is an electrochemical device that uses a thin selective membrane or film as the recognition element, and is an electrochemical half-cell equivalent to other half-cells of the zeroth (inert metal in a redox electrolyte). in common methods o...

Journal: :مجله انسان، محیط زیست و ارتقاء سلامت 0
tooran yarahmadi department of environmental health engineering, zanjan university of medical sciences, zanjan, iran mazyar peyda department of environmental health engineering, zanjan university of medical sciences, zanjan, iran mehran fazli mohammadian department of environmental health engineering, zanjan university of medical sciences, zanjan, iran rizan rezaeian department of environmental health engineering, zanjan university of medical sciences, zanjan, iran negin soleimani department of environmental health engineering, zanjan university of medical sciences, zanjan, iran

background; turbidity removal using inorganic coagulants such as iron and aluminum salts in water treatment processes causes environmental and human health concern. historically, the use of natural coagulant to purify turbid water has been practiced for a long time. recent research indicates that descurainia sophia seed can be effectively used as a natural coagulant to remove water turbidity. m...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده ادبیات و علوم انسانی 1390

abstract birbery and corruption and other criminal and as such is one of social phenomena , and i can firmly say that society is protected and safe from harm , this is criminal . eache community is familiar with these crimes and the crime associated ( direct or indirect ) with the political economic , social , and cultural beliefs and religious issues , especially with the community . admitted...

Journal: :محیط شناسی 0
گاگیک بدلیانس قلی کندی دانشگاه صنعت آب و برق (شهید عباسپور)، دانشیار دانشکدة مهندسی آب و محیط زیست حسین حضرتی دانشگاه صنعتی شریف ،کارشناس ارشد مهندسی شیمی- محیط زیست هادی رستمیان شرکت آب و فاضلاب سمنان، کارشناس ارشد مهندسی آب و فاضلاب

one of the principles for designing and using the various units of water treatment plants is ability of assigning and predicting performance of those units in different and various conditions that could be checked by making pilot and could be modeled by means of available programs and software such as artificial neural network. at this study a model provided for predict performance of pressure ...

Journal: :پژوهش های علوم و صنایع غذایی ایران 0
e. jahed m.h. haddad khodaparast kh. behzad m. elahi a. koocheki

in this study, response surface methodology was used to determine the optimum raw sugar beet juice purification process conditions using bentonite to produce inverted liquid sugar. for this purpose, impact of factors on the purification process such as bentonite concentration (1-5 gr/li), ph (3.5-6) and temperature (35-95 ˚c) was investigated. for each response, a second-order polynomial model ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیخ بهایی - دانشکده زبانهای خارجی 1391

even though, to date, a lot of studies have been conducted on the subject of politeness theory, there are very few studies regarding the applicability of this theory to translation between english and persian which shows the reason behind conducting the present study. this study was carried out with the aim of highlighting whether there is any difference between english and persian methods of u...

Journal: :international journal of environmental research 2013
s. carpinteyro-urban l.g. torres

the aim of this work was to optimize the coagulation-flocculation (cf) process applied tomunicipal wastewaters (ww). optimization of cf was performed to minimize chemical oxygen demand(cod), turbidity, sludge produced, and some metals in sludge. a box-behnken design was used to evaluate the effects and interactions of three factors such as type of biopolymer (guar, mesquite seed gum and opuntia...

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2009
C Lacour C Joannis M-C Gromaire G Chebbo

Turbidity sensors can be used to continuously monitor the evolution of pollutant mass discharge. For two sites within the Paris combined sewer system, continuous turbidity, conductivity and flow data were recorded at one-minute time intervals over a one-year period. This paper is intended to highlight the variability in turbidity dynamics during wet weather. For each storm event, turbidity resp...

ژورنال: سلامت و محیط زیست 2011
تکدستان, افشین, علوی بختیاروند, سید نادعلی, میرزایی, آزاده,

Backgrounds and Objectives: Selection of  proper coagulants for turbidity removal and determination of effective methods to reduce coagulants dose and related costs in water treatment plants is of critical importance. The present study investigates the effect of returned sludge on improving the performance of poly-aluminum chloride (PAC) in turbidity, coliform bacteria, heterotrophic bacteria r...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تحصیلات تکمیلی صنعتی کرمان - پژوهشکده برق و کامپیوتر 1390

a phase-locked loop (pll) based frequency synthesizer is an important circuit that is used in many applications, especially in communication systems such as ethernet receivers, disk drive read/write channels, digital mobile receivers, high-speed memory interfaces, system clock recovery and wireless communication system. other than requiring good signal purity such as low phase noise and low spu...

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