نتایج جستجو برای: sio2 pr so3h

تعداد نتایج: 45324  

2004
Fangxia Feng Zhiwei Yang Decio H. Coutinho John P. Ferraris Kenneth J. Balkus

Transparent free-standing mesoporous silica (MS) films were synthesized from a system of TMOS-Brij-Acid-H2O. The non-ionic surfactants used included Brij 22 (C12EO10OH), Brij 56 (C16EO10OH), and Brij 76 (C18EO10OH). The acids used include HCl, H3PO4, and CF3SO3H. The effect of synthesis parameters on the synthesis and the proton conductivity of mesoporous silica were investigated. The Brij 56/C...

Journal: :CoRR 2014
Tingyao Xiong Jonathan I. Hall

It has been noticed that all the known binary sequences having the asymptotic merit factor ≥ 6 are the modifications to the real primitive characters. In this paper, we give a new modification of the character sequences at length N = p1p2 . . . pr, where pi’s are distinct odd primes and r is finite. Based on these new modifications, for N = p1p2 . . . pr with pi’s distinct odd primes, we can co...

2012
SEYED MOHAMMAD VAHDAT MARYAM AKBARI

Ionic liquid with multi-SO3H groups was employed as a catalyst for facile preparation of 1,8dioxo-decahydroacridines via the one-pot condensation of various aldehydes, 1,3-diketones with aromatic amines or ammonium acetate. Various aromatic aldehydes were utilized in the reaction and in all situations the desired product were synthesized successfully. The described novel synthesis method propos...

2007
Hancheng Zhou Feng Shi Xiong Tian Qinghua Zhang Youquan Deng

Selective synthesis of carbamates from amines and dimethyl carbonate were studied in the presence of various ionic liquids as catalysts. The SO3H-functionalized ionic liquid was found to be the most active catalyst among the applied ionic liquids, and nearly 100% conversion and 95% electivity were achieved when using 1,6-hexanediamine as reactant. The acid functional ionic liquid catalyst syste...

Alireza Badiei Ghodsi Mohammadi Ziarani, Monireh Shakiba Negar Lashgari Somayeh Mousavi

1,8-Dioxo-decahydroacridines have been synthesized by the three-component reaction of aromatic aldehydes, aromatic amines (or ammonium acetate), and dimedone in the presence of sulfonic acid functionalized nanoporous silica (SBA-Pr-SO3H) under solvent-free conditions. Excellent yields, short reaction times, mild reaction conditions, an...

In this protocol, 3-(2-carboxybenzoyl)-1-methyl-1H-imidazol-3-ium chloride [Cbmim]Cl and sulfonic acid functionalized pyridinium chloride [pyridine-SO3H]Cl as a new, reusable, and green Brønsted acidic ionic liquid (BAIL) catalyst were synthesized and successfully used for the one-pot ring opening of epoxide with sodium azide (NaN3) in water at room temperature. Epoxides under ring-opening easi...

Journal: :J. Comb. Theory, Ser. A 1991
Günter M. Ziegler

The absolute value of the Möbius function of a bounded poset P with n + 2 elements satisfies |μ(P )| ≤ max r≥0 max p1+...+pr=n pi≥1 r ∏

2017
Julian Henriques

This article takes its name and inspiration from Mad Professor’s album A Caribbean Taste of Technology in response to the theme of this Technosphere issue. This makes a good place to start a discussion of creolization and technology – the dub reggae tracks of this album produced British producer Mad Professor and released in 1985, https://www.youtube.com/watch?v=ewDTHfJqLwI So what I present he...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علوم کشاورزی و منابع طبیعی ساری - دانشکده علوم کشاورزی 1391

بیماری بلاست برنج از مهمترین عوامل کاهش محصول طی دوره ی رشد برنج است که سالانه خسارت قابل توجهی را سبب می شود. تا کنون برای کنترل این بیماری از ارقام مقاوم و سموم کشاورزی استفاده می شد که با توجه به اثر سوء استفاده بی رویه از سموم کشاورزی بر محیط زیست و مقاومتی که در پاتوژن به دلیل مصرف سموم ایجاد می شود، تلاش ها متوجه روشهایی نظیر تولید گیاهان تراریخته است که کمترین اثر سوء و بیشترین کارایی را...

2012
Youyu Wu Chao Zhang Yachun Liu Zaihui Fu Baohua Dai Dulin Yin

A heterogeneous process for the hydrolysis of bamboo into reducing sugars, a process catalyzed by biomass char sulfonic acids (BC-SO3Hs), was carried out under microwave irradiation. This transformation technology was nearly ineffective with regards to the hydrolysis of fresh bamboo because of the impeding lignin that was wrapped around the cellulose, but the hydrolysis proceeded efficiently wh...

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