نتایج جستجو برای: surface response model
تعداد نتایج: 3413728 فیلتر نتایج به سال:
خمکاری در صنعت ورقکاری از اهمیت زیادی برخوردار است. برگشت فنری در خمکاری قطعات دقیق می تواند باعث تغییرات تهندسی قابل توجه شده و لذا مشکلات کیفیتی ایجاد نماید به همین علت برگشت فنری ورق در تولید قطعات خم دار در یک محدوده تلرانسی قابل قبول برای کنترل پروسه تولید در نظر گرفته می شود. در بسیاری از مکانیزم ها علاوه بر اینکه رعایت مشخصات دقیق هندسی خم در عملکرد صحیح آن تأثیر مستقیم دارد. مونتاژ صحیح...
در این تحقیق از نانو لوله های کربنی تک جداره برای حذف فلزسنگین سرب از محلول های آبی استفاده شده است. در ابتدا پارامترهای تاثیر گذار بر فرایند جذب محاسبه و در ادامه با یکدیگر مقایسه شدند. در فرایند حذف از روش ناپیوسته (batch) بهره گرفته شد و تاثیر متغیرهایی از قبیل غلظت های اولیه یون سرب در محلول، زمان تماس، ph ، مقدار جاذب و دما روی بازده حذف یون فلز سرب به کمک روش نوین طراحی آزمایش وبا استفاده...
چکیده ندارد.
the effect of dry material, glycerol and ratio of water to seed in alyssum homalocarpum films on their thickness, transparency, moisture content, tensile strength, elongation and water vapor permeability was investigated using mixture response surface methods. dry material and glycerol were important factors influencing tensile strength, elongation and water vapor permeability. ratio of water t...
a chemically modified carbon paste electrode with multiwall carbon nanotube (mwcnt) was prepared and used as a sensor for cu2+ ion. the unique chemical and physical properties of cnt have paved the way to new and improved sensing devices. a central composite chemometrics design was applied for multivariate optimization of the effects of three significant parameters (graphi...
considering the increasingly high attention to quality, promoting the reliability of products during designing process has gained significant importance. in this study, we consider one of the current models of the reliability science and propose a non-linear programming model for redundancy allocation in the series-parallel systems according to the redundancy strategy and considering the assump...
in this research, a rapid, reliable and selective dispersive liquid-liquid microextraction (dllme) followed by direct injection of microdroplet to graphite furnace atomic absorption spectrometry (gf-aas) method for the determination of ultra-trace amounts of ag(i) was developed. effect of the important experimental parameters on the extraction efficiency of ag(i) was investigated using response...
background and objective: glucoamylase is a potent starch degrading enzyme whose cheap production has been an area of research. its production by aspergillus niger in solid-state fermentation was studied using dried garden pea peel as a substrate, which enormously reduced the production cost. the current study intended to produce glucoamylase by a cost-effective strategy and exhaustively charac...
statistical optimization of tannase production by penicillium sp. ez-zh390 in submerged fermentation
tannase has several important applications in food, feed, chemical and pharmaceutical industries. in the present study, production of tannase by mutant strain, penicillium sp. ez-zh390, was optimized in submerged fermentation utilizing two statistical approaches. at first step, a one factor at a time design was employed to screen the preferable nutriments (carbon and nitrogen sources of the med...
incorporation of functional foods and nutraceuticals such as carotenoids which suffer from poor water solubility and low bioavailability into nano-sized delivery systems can improve their solubility, stability and oral bioavailability. the aim of this study was to prepare β-carotene nanodispersion and investigate the effects of preparation parameters by means of response surface methodology usi...
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