نتایج جستجو برای: some such alkali treatments as naoh

تعداد نتایج: 6553391  

2017
Xingyan Huang Cornelis F. De Hoop Feng Li Jiulong Xie Chung-Yun Hse Jinqiu Qi Yongze Jiang Yuzhu Chen

Microwave-assisted liquefaction of rape straw in methanol was conducted to collect the liquefied residues for the extraction of cellulose nanocrystals (CNCs). The liquefied residue with content of 23.44% from 180C/7.5min was used to fibrillate CNCs with dilute alkali (2% NaOH) and hydrogen peroxide (5% H 2 O 2 ) treatments, followed by ultrasonication for 15min. The FT-IR spectra and SEM images...

ژورنال: اقیانوس شناسی 2011
آبرومند, پرویز, رجبی اسلامی, هومن, فیلی زاده, یوسف, ماشینچیان, علی, کارخانه یوسفی, مهدیه,

Agar extraction for Gracilaria corticata by investigating the effects of various extraction variables such as soaking time, soaking temperature, seaweed to water ratio, extraction temperatures and extraction time and also Alkali treatment method. The results showed that agar yield was significantly affected by all the tested variables. The agar yield was maximized when extraction process was ca...

Journal: :The Journal of biological chemistry 1971
H Lyons J A Singer

The validity of the reducing end group (copper reduction) method for determination of chain weight of chondroitin sulfate is shown by comparison with chain weight determination from linkage region components, xylose and galactose. It is established that chains of both chondroitin sulfate and keratan sulfate are stable to alkali as strong as 2.0 N NaOH at room temperature for at least 120 hours....

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اصفهان 1389

implicit and unobserved errors and vulnerabilities issues usually arise in cryptographic protocols and especially in authentication protocols. this may enable an attacker to make serious damages to the desired system, such as having the access to or changing secret documents, interfering in bank transactions, having access to users’ accounts, or may be having the control all over the syste...

Journal: :Water research 2014
M Ruiz-Hernando J Martín-Díaz J Labanda J Mata-Alvarez J Llorens F Lucena S Astals

Waste activated sludge is slower to biodegrade under anaerobic conditions than is primary sludge due to the glycan strands present in microbial cell walls. The use of pre-treatments may help to disrupt cell membranes and improve waste activated sludge biodegradability. In the present study, the effect of ultrasound, low-temperature thermal and alkali pre-treatments on the rheology, hygienizatio...

F. Moztarzadehii K. Fatehii M. Solati Hashtjiniii

In this study, time of calcium phosphate formation on Ti6Al4V alloy with or without alkali and heat treatments was investigated. Specimens were soaked in 0, 5, 10 M solutions of NaOH at temperatures of 60 or 80 °C for 24, 72 h. Their surfaces were characterized using scanning electron microscopy and thin film X-ray diffraction. It was found that optimum condition is 72h soaking in 5 M NaOH in 8...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده علوم 1391

in this research we have studied the effect of some transition-metals (cu, ag and au) substitutions on two-electron reduction potential of flavins by application of dft method. all geometries have been optimized at blyp level of theory and “6-31+g** + lanl2dz” mixed basis set. the frequency job at the same method and basis sets has been performed to obtain gibbs free energy of compounds. it h...

Journal: :Journal of The Textile Institute 2021

Fabric pilling is formed due to the entanglement of fibers during mechanical actions including abrasion, domestic washing process, and wearing cycles. Pilling resistance one important aesthetic property fabrics controlling appearance fabric quality. can be controlled by different methods; alkali treatment methods for lyocell fabric. In this study, prediction on treated has been done through a f...

2007
B. G. Ololade D. N. Mowat

Whole-plant barley was reconstituted and treated with sodium hydroxide (NaOH) at the rate of 0, 2, 3 or 4% of dry matter. Rumen-fistulated sheep were used to investigate the effects of treatment on nutrient digestibility and concentration of rumen fluid and plasma metabolites. Treatments increased digestibility of dry matter, neutral detergent fibre, acid detergent fibre, cellulose and non-star...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بیرجند 1388

a significant problem in multicarrier communication systems is the necessity to reduce the value of papr (peak-to-average power ratio) of transmitting signal. in this thesis we study the effect of the system parameters such as coding and modulation types on papr and ultimate ber in a mc-cdma system. in this study we consider fading channel as well as the nonlinearity of transmitter’s amplifier ...

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