Dry Finishing Using Plasma Treatment for Shortening the Initial Wet Finishing of Cotton Fabrics

Nezam Samei,Sheila Shahidi,Rattanaphol Mongkholrattanasit 한국섬유공학회 2022 Fibers and polymers Vol.23 No.12

Simultaneity of different processes in finishing of textile products is very useful. It causes reducing energyconsumption and increasing the speed of production. Moreover, by this way it is possible to reduce water consumption andenvironmental pollution. In this research, synchronizing the processes of desizing, scouring and bleaching at ambienttemperature for raw cotton fabrics have been investigated using plasma technology. In this work plasma textile activator,under air atmospheric pressure was used. Untreated and plasma treated cotton fabric were desized, scoured and bleachedusing a solution containing alkaline peroxide and ammonium persulfate as an oxidation accelerator by padding method atroom temperature (Cold Pad Batch). In order to evaluate the results of this treatment, the amount of impurities, degree ofwhiteness and wettability of untreated and plasma treated fabrics were investigated and compared with each other. The resultsshow that the starch partially remains on untreated fabric, while by plasma treatment the starch is completely removed. Plasma treated fabrics have a higher degree of wetting and a higher whiteness than those of untreated. Results of this studyindicate that the plasma treatment of cotton reduces the time it takes to remove starch from cotton products. SEM images ofuntreated and plasma treated fabrics, as well as FTIR spectra of the fabrics; indicate the degradation of starch by the plasmaprocess and the increase of polar groups in cotton fibers. Also, by performing a dry plasma treatment on raw cotton, whileallowing the desizing, scouring and bleaching steps to be simultaneously, economized in water and energy at a single stageand at ambient temperature.

Umbilical Cord Mesenchymal Stem Cell Treatment for Crohn’s Disease: A Randomized Controlled Clinical Trial

( Jian Zhang ),( Samei Lv ),( Xiaojing Liu ),( Bin Song ),( Liping Shi ) 대한간학회 2018 Gut and Liver Vol.12 No.1

Background/Aims: Stem cell therapy has been applied to treat a variety of autoimmune diseases, including Crohn’s disease (CD), but few studies have examined the use of umbilical cord mesenchymal stem cells (UC-MSCs). This trial sought to investigate the efficacy and safety of UC-MSCs for the treatment of CD. Methods: Eighty-two patients who had been diagnosed with CD and had received steroid maintenance therapy for more than 6 months were included in this study. Forty-one patients were randomly selected to receive a total of four peripheral intravenous infusions of 1×10⁶ UC-MSCs/kg, with one infusion per week. Patients were followed up for 12 months. The Crohn’s disease activity index (CDAI), Harvey-Bradshaw index (HBI), and corticosteroid dosage were assessed. Results: Twelve months after treatment, the CDAI, HBI, and corticosteroid dosage had decreased by 62.5±23.2, 3.4±1.2, and 4.2±0.84 mg/day, respectively, in the UC-MSC group and by 23.6±12.4, 1.2±0.58, and 1.2±0.35 mg/day, respectively, in the control group (p<0.01, p<0.05, and p<0.05 for UC-MSC vs control, respectively). Four patients developed a fever after cell infusion. No serious adverse events were observed. Conclusions: UC-MSCs were effective in the treatment of CD and produced mild side effects. (Gut Liver 2018;12:73-78)

SR-ADDITIVE CODES

Mahmoudi, Saadoun,Samei, Karim Korean Mathematical Society 2019 대한수학회보 Vol.56 No.5

In this paper, we introduce SR-additive codes as a generalization of the classes of ${\mathbb{Z}}_{p^r}{\mathbb{Z}}_{p^s}$ and ${\mathbb{Z}}_2{\mathbb{Z}}_2[u]$-additive codes, where S is an R-algebra and an SR-additive code is an R-submodule of $S^{\alpha}{\times}R^{\beta}$. In particular, the definitions of bilinear forms, weight functions and Gray maps on the classes of ${\mathbb{Z}}_{p^r}{\mathbb{Z}}_{p^s}$ and ${\mathbb{Z}}_2{\mathbb{Z}}_2[u]$-additive codes are generalized to SR-additive codes. Also the singleton bound for SR-additive codes and some results on one weight SR-additive codes are given. Among other important results, we obtain the structure of SR-additive cyclic codes. As some results of the theory, the structure of cyclic ${\mathbb{Z}}_2{\mathbb{Z}}_4$, ${\mathbb{Z}}_{p^r}{\mathbb{Z}}_{p^s}$, ${\mathbb{Z}}_2{\mathbb{Z}}_2[u]$, $({\mathbb{Z}}_2)({\mathbb{Z}}_2+u{\mathbb{Z}}_2+u^2{\mathbb{Z}}_2)$, $({\mathbb{Z}}_2+u{\mathbb{Z}}_2)({\mathbb{Z}}_2+u{\mathbb{Z}}_2+u^2{\mathbb{Z}}_2)$, $({\mathbb{Z}}_2)({\mathbb{Z}}_2+u{\mathbb{Z}}_2+v{\mathbb{Z}}_2)$ and $({\mathbb{Z}}_2+u{\mathbb{Z}}_2)({\mathbb{Z}}_2+u{\mathbb{Z}}_2+v{\mathbb{Z}}_2)$-additive codes are presented.

Some Weighted Group Algebras are Operator Algebras

Lee, Hun Hee,Samei, Ebrahim,Spronk, Nico Cambridge University Press 2015 Proceedings of the Edinburgh Mathematical Society Vol.58 No.2

<B>Abstract</B><P>Let <I>G</I> be a finitely generated group with polynomial growth, and let <I>ω</I> be a weight, i.e. a sub-multiplicative function on <I>G</I> with positive values. We study when the weighted group algebra <I>ℓ</I><SUP>1</SUP> (<I>G, ω</I>) is isomorphic to an operator algebra. We show that <I>ℓ</I><SUP>1</SUP> (<I>G, ω</I>) is isomorphic to an operator algebra if <I>ω</I> is a polynomial weight with large enough degree or an exponential weight of order 0 < <I>α</I> < 1. We demonstrate that the order of growth of <I>G</I> plays an important role in this problem. Moreover, the algebraic centre of <I>ℓ</I><SUP>1</SUP> (<I>G, ω</I>) is isomorphic to a <I>Q</I>-algebra, and hence satisfies a multi-variable von Neumann inequality. We also present a more detailed study of our results when <I>G</I> consists of the <I>d</I>-dimensional integers ℤ<SUP><I>d</I></SUP> or the three-dimensional discrete Heisenberg group ℍ3(ℤ). The case of the free group with two generators is considered as a counter-example of groups with exponential growth.</P>

$SR$-additive codes

Saadoun Mahmoudi,Karim Samei 대한수학회 2019 대한수학회보 Vol.56 No.5

In this paper, we introduce $SR$-additive codes as a generalization of the classes of $\mathbb{Z}_{p^r}\mathbb{Z}_{p^s}$ and $\mathbb{Z}_{2}\mathbb{Z}_{2}[u]$-additive codes, where $S$ is an $R$-algebra and an $SR$-additive code is an $R$-submodule of $S^{\alpha}\times R^{\beta}$. In particular, the definitions of bilinear forms, weight functions and Gray maps on the classes of $\mathbb{Z}_{p^r}\mathbb{Z}_{p^s}$ and $\mathbb{Z}_{2}\mathbb{Z}_{2}[u]$-additive codes are generalized to $SR$-additive codes. Also the singleton bound for $SR$-additive codes and some results on one weight $SR$-additive codes are given. Among other important results, we obtain the structure of $SR$-additive cyclic codes. As some results of the theory, the structure of cyclic $\mathbb{Z}_{2}\mathbb{Z}_{4}$, $\mathbb{Z}_{p^r}\mathbb{Z}_{p^s}$, $\mathbb{Z}_{2}\mathbb{Z}_{2}[u]$, $(\mathbb{Z}_{2})(\mathbb{Z}_{2} + u\mathbb{Z}_{2} + u^{2}\mathbb{Z}_{2})$, $(\mathbb{Z}_{2} + u\mathbb{Z}_{2} )(\mathbb{Z}_{2} + u\mathbb{Z}_{2} + u^{2}\mathbb{Z}_{2})$, $(\mathbb{Z}_{2})(\mathbb{Z}_{2} + u\mathbb{Z}_{2} + v\mathbb{Z}_{2})$ and $(\mathbb{Z}_{2} + u\mathbb{Z}_{2} )(\mathbb{Z}_{2} + u\mathbb{Z}_{2} + v\mathbb{Z}_{2})$-additive codes are presented.

$p$-Fourier algebras on compact groups

Lee, Hun Hee,Samei, Ebrahim,Spronk, Nico European Mathematical Society Publishing House 2018 Revista matemática iberoamericana Vol.34 No.4

MACWILLIAMS IDENTITY FOR LINEAR CODES OVER FINITE CHAIN RINGS WITH RESPECT TO HOMOGENEOUS WEIGHT

Moeini, Mina,Rezaei, Rashid,Samei, Karim Korean Mathematical Society 2021 대한수학회보 Vol.58 No.5

In this paper, we obtain the MacWilliams identity for linear codes over finite chain rings with respect to homogeneous weight, and the product of chain rings.

Duadic codes over finite local rings

Arezoo Soufi Karbaski,Karim Samei 대한수학회 2022 대한수학회보 Vol.59 No.2

In this paper, we introduce duadic codes over finite local rings and concentrate on quadratic residue codes. We study their properties and give the comprehensive method for the computing the unique idempotent generator of quadratic residue codes.

Projectivity of modules over Fourier algebras

Forrest, Brian E.,Lee, Hun Hee,Samei, Ebrahim London Mathematical Society 2011 Proceedings of the London Mathematical Society Vol.102 No.4

Weak amenability of Fourier algebras and local synthesis of the anti-diagonal

Lee, H.H.,Ludwig, J.,Samei, E.,Spronk, N. Academic Press ; Elsevier Science B.V. Amsterdam 2016 Advances in mathematics Vol.292 No.-

<P>We show that for a connected Lie group G, its Fourier algebra A(G) is weakly amenable only if G is abelian. Our main new idea is to show that weak amenability of A(G) implies that the anti-diagonal, Delta G = {(g, g(-1)) : g is an element of G} is a set of local synthesis for A(G x G). We then show that this cannot happen if G is non-abelian. We conclude for a locally compact group G, that A(G) can be weakly amenable only if it contains no closed connected non-abelian Lie subgroups. In particular, for a Lie group G, A(G) is weakly amenable if and only if its connected component of the identity G(e) is abelian. (C) 2016 Elsevier Inc. All rights reserved.</P>