Results 21 to 30 of about 722,741 (282)

Comparison on the characteristics of Salix nigra Kraft and Soda pulp and paper [PDF]

تحقیقات علوم چوب و کاغذ ایران, 2014
In this study pulp and hand sheets paper characteristics of Salix nigra wood kraft and soda pulp and paper were investigated. Average density of dry and bulk density wood were determined 0.35 and 150 kg/m3 and average fiber dimension consist of fiber ...
Lila Karami motaghi, Hossein Hosseinkhani, Fardad Golbabaei   +2 more
doaj   +1 more source

Estimation of hydrogen peroxide effectivity during bleaching using the Kappa number

Chemical Papers, 2021
The bleaching of wood fibres using hydrogen peroxide is the primary process to produce paper with suitable brightness. Several studies were made to define the hydrogen peroxide consumption and the brightness gain rate. However, the effectivity of the hydrogen peroxide towards the reaction with the chromophores in the fibres and not lost by ...
Giorgio Tofani, Iris Cornet, Serge Tavernier   +2 more
openaire   +2 more sources

Investigation on TCF Bleaching of Tobacco stalk ( Nicotiana tabacum L.'Coker 347') Soda Pulp [PDF]

تحقیقات علوم چوب و کاغذ ایران, 2014
In this study the effect of different values of peroxide in three levels 3%, 4%, 5% and sodium hydroxide in two levels 2%, 3%, on bleaching of tobacco stalks ( Nicotiana tabacum L. 'PVH 19') soda pulp was investigated.
Seyed_Pedram Hashemi, Asghar Tabei, Seyyed Peyman Hashemi   +2 more
doaj   +1 more source

The effects of hot water pre-extraction and alkaline catalyzed on soda-AQ pulping of kenaf whole stem [PDF]

تحقیقات علوم چوب و کاغذ ایران, 2011
In the present study the effects of hot water pre-extraction and alkaline catalyzed were evaluated on soda-aq pulping of kenaf whole stem. In this respect, following kenaf chips pre-extraction at various temperature and time conditions, pulp preparation ...
Mohammad taghi Asdolah zadeh, Hossein Resalti, Ali Ghasemian   +2 more
doaj   +1 more source

Comparative Investigation on the properties of Soda and Soda-Ethanol pulps from three hardwoods [PDF]

تحقیقات علوم چوب و کاغذ ایران, 2015
Strength properties and the yield of soda and soda-ethanol pulps produced using hornbeam, beech and poplar woods were investigated. Soda pulps were produced applying 20% active alkali and the soda-ethanol pulps were made using 10% active alkali and 50 ...
Hosein Valayi, Ahmad Jahan Latibari
doaj   +1 more source

Improving the low-lying spectrum of the overlap kernel [PDF]

, 2001
The action of the overlap-Dirac operator on a vector is typically implemented in directly through a multi-shift conjugate gradient solver. The compute-time this takes to evaluate depends upon the condition number $\kappa$ of the matrix that is used as ...
A.G. Williams, Bonnet, D. Adams, D.B. Leinweber, Edwards, Edwards, Neuberger, W. Kamleh   +7 more
core   +2 more sources

Formation of Power-law Energy Spectra in Space Plasmas by Stochastic Acceleration due to Whistler-Mode Waves [PDF]

, 1998
A non-relativistic Fokker-Planck equation for the electron distribution function is formulated incorporating the effects of stochastic acceleration by whistler-mode waves and Coulomb collisions.
Armstrong, Christon, Chun-yu Ma, Collier, Danny Summers, Dermer, Dessler, Divine, Gosling, Gurevich, Hasegawa, Hinton, Kennel, Kivelson, Mace, Mace, Melrose, Pryadka, Schlickeiser, Sittler, Steinacker, Summers, Summers, Summers, Summers, Vasyliunas, Xue   +26 more
core   +2 more sources

The number of L_{infty,kappa}-equivalent non-isomorphic models for kappa weakly compact

, 1999
For a cardinal kappa and a model M of cardinality kappa let No(M) denote the number of non-isomorphic models of cardinality kappa which are L_{infty,kappa}--equivalent to M. In [Sh:133] Shelah established that when kappa is a weakly compact cardinal and mu<=kappa is a nonzero cardinal, there exists a model M of cardinality kappa with No(M)=mu.
Shelah, Saharon, Väisänen, Pauli
openaire   +3 more sources

Conflict free colorings of (strongly) almost disjoint set-systems

, 2010
A set-system $X$ is a $(\lambda, \kappa,\mu)$-system iff $|X|=\lambda$, $|x|=\kappa$ for each $x\in X$, and $X$ is $\mu$-almost disjoint. We write $[\lambda, \kappa, \mu] -> \rho$ iff every $(\lambda, \kappa,\mu)$-system has a "conflict free coloring ...
Hajnal, András, Juhász, István, Soukup, Lajos, Szentmiklóssy, Zoltán   +3 more
core   +1 more source

Evaluating the Pulpability and Paper Performance of Soda and Soda-Anthraquinone Pulping of Acacia Mearnsii

Journal of Natural Fibers
This study examines the pulpability of A. mearnsii grown in Ethiopia to manufacture soda and soda-anthraquinone (AQ) pulp and paper under various pulping conditions. Pulping was performed at active alkali concentrations ranging from 15 to 25%.
Mahelete Tsegaye, Tewabech Alemu, Gemechu Yadeta, Tegene Tantu, Yonas Yohannes, Gemechu Jebeso, Berhanu Sugebo, Amsalu Tolessa   +7 more
doaj   +1 more source