Hatem E. Gaffer, Mohamed R. Elgohary, Hassan Ali Etman and Saad Shaaban
The purpose of this paper was to synthesize novel antibacterial reactive dyes for dyeing cotton fabrics.
Abstract
Purpose
The purpose of this paper was to synthesize novel antibacterial reactive dyes for dyeing cotton fabrics.
Design/methodology/approach
Four synthetic novel antibacterial reactive dyes based on sulfonamide (D1-D4) have been synthesized by the coupling reaction of sulfonamide diazonium salt with sulfonamido-cyanurated 7-amino-4-hydroxynaphthalene-2-sulfonic acid “j-acid”. The chemical structure of the synthesized dyes was secured by their spectral data [infra red (IR) and proton Nuclear magnetic Resonance (1HNMR)].
Findings
The prepared reactive dyes (D1-D4) were applied to cotton fabrics. Optimum conditions of the dying samples at sodium sulfate 100 g/l, liquor ratio (L.R.) 1:10, sodium carbonate 20 g/l at 80°C (D1, D2 and D4), 60°C (D3 for 60 min) were investigated. The fastness properties toward washing, perspiration, rubbing and light were evaluated. Dyed fabrics showed good light fastness property and good to very good washing and perspiration fastness properties according to the gray scale. Antimicrobial activities for synthesized dyes showed excellent activity against gram-negative organisms such as Pseudomonas aeruginosa and Proteus mirabilis faecalis, whereas very good activity against gram-positive organisms such as Staphylococcus aureus and Enterococcus faecalis with respect to the standard drugs ampicillin and chloramphenicol.
Originality/value
The principle advantages in this study were that the synthesis of novel synthesized dyes by introducing bisulfonamide-based moieties to increase the antimicrobial activity of the cellulose fabrics could be used as a medical textile, short reaction time and reaction procedure conducted in few steps, the work up is convenient and thus the starting material can be easily prepared.
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H.E. Gaffer, S. Shaaban, N.A. Abed and E. Abdel-latif
This paper aimed to synthesise some new selenium-containing pyrazole, thiazole and thiophene dyestuffs and investigate their application in dyeing polyester fabrics.
Abstract
Purpose
This paper aimed to synthesise some new selenium-containing pyrazole, thiazole and thiophene dyestuffs and investigate their application in dyeing polyester fabrics.
Design/methodology/approach
4,4′-Diselanediyl-bis-(2-methoxyaniline) was diazotized by acetic acid/sodium nitrite and coupled with active methylene components such as malononitrile, ethyl cyanoacetate and ethyl acetoacetate, and their corresponding hydrazono products were cyclised with hydrazine or phenyl hydrazine to obtain a series of arylazo-pyrazole dyestuffs. Furthermore, diazo-coupling reactions of the diazotized 4,4′-diselanediyl-bis-(2-methoxyaniline) were developed to obtain a new series of 2-amino-5-arylazo-thiazole- and 4-aryazo-3-hydroxy-2-substituted thiophene dyestuffs.
Findings
The structure of the synthesised dyestuffs was established and confirmed based on their elemental analysis and spectral data (infrared, proton nuclear magnetic resonance and mass spectroscopies). The synthesised selenium-containing dyestuffs were applied as disperse dyes on polyester fabrics by high temperature-pressure technique. The dyeing characteristics of these dyestuffs were evaluated, and they were found to exhibit good fastness properties.
Originality/value
A series of symmetrical diselenide dyestuffs containing pyrazole, thiazole or thiophene coupler components were synthesised. The authors studied their application for dyeing polyester fabrics; they are superior in terms of preparation, yield, purity and fastness properties.
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Walid Shaaban Abdelrasoul Mohamed
The purpose of this study is to find an applicable solution for the consolidation of petrified paper after disassembling it to complete other stages of treatment.
Abstract
Purpose
The purpose of this study is to find an applicable solution for the consolidation of petrified paper after disassembling it to complete other stages of treatment.
Design/methodology/approach
The samples were subjected to natural aging by being inoculated with Aspergillus niger until they reached the stage of adhesion and petrification. After that, the leaves were separated, and cellulose nanocrystals were applied, then the leaves were subjected to wet thermal aging for 21 days. Digital microscope, scanning electron microscope, mechanical properties measurement, measurement of color change, Fourier transform infrared spectroscopy and pH measurement were used to evaluate the effects of the cellulose nanocrystal on paper.
Findings
The results proved that cellulose nanocrystal (5%) successes consolidation of petrified paper Without affecting its natural, mechanical and chemical properties.
Originality/value
This study was based on the effectiveness of cellulose nanocrystal in strengthening the petrified papers and testing its effect on the physical, mechanical and chemical paper properties.
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Salomée Ruel, Lhoussaine Ouabouch and Sabry Shaaban
The purpose of this paper is to study the following research question: how can information systems (ISs) be the real sources of uncertainty for supply chain management (SCM)…
Abstract
Purpose
The purpose of this paper is to study the following research question: how can information systems (ISs) be the real sources of uncertainty for supply chain management (SCM), despite their positive roles in the effectiveness of modern supply chain (SC) organization?
Design/methodology/approach
A typology of the uncertainties linked to ISs and their usage is developed. Then, five explanatory case studies conducted in diverse industries allow to characterize this typology.
Findings
The case studies allow to identify the most frequently recurring uncertainties, namely, “limited IS capacity” and “data unreliability.” In addition, “company size” does not seem to be a relevant dimension for assessing the vulnerability of a SC to uncertainties linked to ISs. On the other hand, the “business sector,” with its implied power influences, was found to be a relevant dimension.
Research limitations/implications
This research does not allow to rank uncertainties according to their level of criticality.
Practical implications
This paper enables SC and information systems managers, as well as ISs/SC project managers to be aware of the need to consider ISs not only as the vectors for performance, but also as the factors for uncertainty in SCs.
Originality/value
ISs are generally considered to be a vector of performance. Nevertheless, their use remains problematic in many companies. This paper falls within both the ISs and SCM research areas. In the latter field, typologies of the uncertainties are common, but often ignore the uncertainties linked to ISs and their usage. The authors suggest envisaging ISs as the potential factors for uncertainty in the context of SCM.
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Walid Shaaban Abdelrasoul Mohamed
This paper aims to find a suitable solution to treat the solidification paper by using hydroxypropyl cellulose (HPC) to improve the mechanical, physical and chemical properties of…
Abstract
Purpose
This paper aims to find a suitable solution to treat the solidification paper by using hydroxypropyl cellulose (HPC) to improve the mechanical, physical and chemical properties of paper.
Design/methodology/approach
The samples have gone several stages, starting with the manufacture of paper from the linen pulp and the same components of the hardened manuscript papers. It was subjected to artificial aging to reach an age comparable to the manuscript age, then it was subjected to natural aging by inoculation it with A. niger. Mechanical cleaning of the leaves was done with soft brushes. The samples have been consolidated by HPC 2%. Digital microscopy, scanning electron microscopy, mechanical properties measurement, color change, Fourier transform infrared and pH measurements were used to assess the effect of HPC on the qualities of leaves.
Findings
HPC succussed in strengthening and restoring the natural, chemical and mechanical properties for the solidified leaves.
Originality/value
The solidified papers phenomenon constitutes severe suffering for manuscripts and books conservators. The paper consolidation initial stage is one of the most important conservation stages because paper has lost many natural, mechanical and chemical properties. The most important feature of this study is providing a solution to the hardened leaves strengthening problem and restoring their chemical, natural and mechanical properties.
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Ahmad Sauffi Yusof, Zainuriah Hassan, Sidi Ould Saad Hamady, Sha Shiong Ng, Mohd Anas Ahmad, Way Foong Lim, Muhd Azi Che Seliman, Christyves Chevallier and Nicolas Fressengeas
The purpose of this paper is to investigate the effect of growth temperature on the evolution of indium incorporation and the growth process of InGaN/GaN heterostructures.
Abstract
Purpose
The purpose of this paper is to investigate the effect of growth temperature on the evolution of indium incorporation and the growth process of InGaN/GaN heterostructures.
Design/methodology/approach
To examine this effect, the InGaN/GaN heterostructures were grown using Taiyo Nippon Sanso Corporation metal-organic chemical vapor deposition (MOCVD) SR4000-HT system. The InGaN/GaN heterostructures were epitaxially grown on 3.4 µm undoped-GaN (ud-GaN) and GaN nucleation layer, respectively, over a commercial 2” c-plane flat sapphire substrate. The InGaN layers were grown at different temperature settings ranging from 860°C to 820°C in a step of 20°C. The details of structural, surface morphology and optical properties were investigated using X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), atomic force microscopy and ultraviolet-visible (UV-Vis) spectrophotometer, respectively.
Findings
InGaN/GaN heterostructure with indium composition up to 10.9% has been successfully grown using the MOCVD technique without any phase separation detected within the sensitivity of the instrument. Indium compositions were estimated through simulation fitting of the XRD curve and calculation of Vegard’s law from UV-Vis measurement. The thickness of the structures was determined using the Swanepoel method and the FE-SEM cross-section image.
Originality/value
This paper report on the effect of MOCVD growth temperature on the growth process of InGaN/GaN heterostructure, which is of interest in solid-state lighting technology, especially in light-emitting diodes and solar cell application.
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The Suez Irrigation Canal is the source of drinking water to a large community. Complaints have been raised regarding the odor and unpleasant taste of drinking water. The problems…
Abstract
Purpose
The Suez Irrigation Canal is the source of drinking water to a large community. Complaints have been raised regarding the odor and unpleasant taste of drinking water. The problems encountered reveled enrichment of the Canal with nutrients, degraded water quality and nuisance caused by algal growth. This paper aims to investigate these claims by evaluating the interaction between water and sediment with ecological indicators.
Design/methodology/approach
Bioassessments were used as a primary tool to evaluate the biological conditions and identify the degree of water quality degradation in the Suez Irrigation Canal. The monitoring program integrates biological, chemical, and physical data assessment. Several field surveys were carried out to these areas during the period between March 2003 and February 2005 (over 23 months) for acquiring all possible information about the current situation and to explore the impact of human activities along the canal banks on the canal ecosystem. Seasonal variations of phytoplankton and zooplankton standing crop, species diversity as well as physico‐chemical characteristics of water, sediment, fish and aquatic weeds at the intakes of drinking plants and from the discharge of agricultural and domestic drains into the Canal were investigated.
Findings
Preliminary field investigations showed great amounts of discharged wastes at several locations to the canal water creating unique conditions, which vary with changes of volume and properties of the discharged wastes. Rotifer and green algae for example demonstrated seasonal variable response to the ecological variations. Myriophyllum spicatum, Potamageton nodsus and Polygonum Salicfolium were the most common types of recorded weed. The Myriophyllum spicatum is the dominant submerged plant. The canal was characterized by high concentrations of HCO3‐ as well as high pH >8.2 which provides a favorable habitat for the growth of Myriophyllum spicatum. The results illustrated the ability of using the aquatic weed as biomarkers for monitoring heavy metals contaminates in the canal. The evidence suggests that there is a degree of selectivity in metals uptake and partitioning within the plant compartments.
Originality/value
The current paper adopts the idea of utilizing multiple organism groups in the bioassessment to effectively detect ecological change when they occur in one of the most important waterways in Egypt. These different organism groups are suited for detection various stressors, providing warnings and detection of stress impacts at different scales. The study presented provides decision makers with important information that can assist them in making objective decisions related to the design of monitoring programs based on scientific research.
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Bilal Ahmad, Sajid Iqbal, Mahnoor Hai and Shahid Latif
This paper aims to examine the mediating role of relational mobile usage on the relationship between personal values (individualism, collectivism and academic self-efficacy) and…
Abstract
Purpose
This paper aims to examine the mediating role of relational mobile usage on the relationship between personal values (individualism, collectivism and academic self-efficacy) and organizational citizenship behavior (OCB) among the faculty members of higher education/degree-awarding institutes (DAIs) in Pakistan. The paper also examines the moderating role of gender on the relationship between relational mobile usage and OCB.
Design/methodology/approach
Cross-sectional data from 217 faculty members of higher education/DAIs in Pakistan were collected through an online questionnaire. Structural equation modeling technique using SmartPLS was used to assess the measurement and structural model. Statistical Package for the Social Sciences (SPSS) version 21 was used for data normality analysis, missing value analysis and variable calculation. Response and non-response bias were also examined.
Findings
The findings confirmed that individualism was not significantly related to relational mobile usage; however, collectivism and academic self-efficacy were significantly related to relational mobile usage. The relationship of relational mobile usage and OCB was also significant. The mediating role of relational mobile usage on the relationship between individualism and OCB was not significant; however, the mediating role of relational mobile usage between collectivism and OCB, and academic self-efficacy and OCB was significant. The moderating role of gender on the relationship between relational mobile usage and OCB was also significant.
Practical implications
DAIs’ administration should strive to encourage individuals to value group priorities over the individualistic interests. Valuing group interest over the individualistic interest would promote the usage of mobile technology for relational purpose. This relational perspective of mobile usage will ultimately develop OCB among individuals. Also, academic self-efficacy through relational mobile usage can lead to OCB; therefore, another important policy implication for the administration of DAIs is to develop academic self-efficacy among the stakeholders of the institutions.
Originality/value
Although OCB has become a theoretically mature concept, the framework proposed for this study has rarely been discussed in previous scholarships, particularly from the perspective of relational mobile usage. Arguably, this study is the first in testing the mediating role of relational mobile usage between the personal values and OCB within the context of academia in Pakistan.
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Hadeel T. Salaheldin, Mark David Major, Ahmad Mohammed Ahmad and Heba O. Tannous
Many factors contribute to public rail transit use in an urban network. However, a dysfunctional relationship between the built environment and the transport system significantly…
Abstract
Purpose
Many factors contribute to public rail transit use in an urban network. However, a dysfunctional relationship between the built environment and the transport system significantly deters such use. Architects, urban designers, town planners and policymakers must understand the factors that promote or deter pedestrian use of the urban environment.
Design/methodology/approach
The paper investigates four connectivity and walkability factors for three different metro stations in Doha, Qatar: Al Aziziyah, Hamad Hospital and West Bay. The analysis includes pedestrian sheds, block sizes, ground-level land uses and connectedness in the urban spatial network based on catchment contour maps using space syntax.
Findings
The results indicate the three metro stations and neighborhoods are representative of diverse type of neighborhoods in Doha: relatively compact but expansive for the Hamad Hospital Station area, metrically and topologically restrictive due to the poor planning and the peninsular location of the reclaimed land in the West Bay area, and expansive, shallow and reliant on attraction for the Al Waab transportation corridor associated with Al Aziziyah Station.
Research limitations/implications
Time factors and temporary closure/capacity reductions due to the global pandemic restricted planned efforts to collect more pedestrian use data based on passive observations and preference choices using surveys during the study. Nonetheless, adapting the investigation to the circumstances produced significant findings.
Social implications
The analysis can help us develop better guidelines and diagnostic tools to calibrate design and planning strategies promoting more walkable, healthy and sustainable neighborhoods.
Originality/value
The study is original due to examining stations of the new Doha Metro for the first time. However, it relies on well-established representational techniques in urban morphology and space syntax research.
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N.A. Abdelwahab and M.A. Nassar
The purpose of this paper is to examine the preparation of adhesive by incorporation of kraft lignin as an agricultural waste into phenol formaldehyde (PF) resin structure and to…
Abstract
Purpose
The purpose of this paper is to examine the preparation of adhesive by incorporation of kraft lignin as an agricultural waste into phenol formaldehyde (PF) resin structure and to evaluate the mechanical properties of lignin phenol formaldehyde (LPF) as wood adhesive.
Design/methodology/approach
PF resin (resole) was prepared using sodium hydroxide as a catalyst. Different concentrations of lignin were incorporated into PF resin structure. The effect of lignin concentration, formaldehyde to phenol molar ratio, catalyst concentration, temperature and time upon solid content, adhesive strength and gel time was studied. The kraft lignin, PF and LPF resins were characterised using FT‐IR and thermal analysis.
Findings
The incorporation of lignin into PF resin (resole) increases adhesive strength and decreases gel time. The highest adhesive strength and the lowest gel time were achieved at 90 per cent of kraft lignin, formaldehyde to phenol molar ratio, 7.2 and 10 per cent of catalyst, after 4 h and at 80°C.
Research limitations/implications
The effect of different concentrations of kraft lignin, formaldehyde/phenol molar ratio, catalyst concentration, temperatures and time upon solid content, gel time and adhesive strength was studied.
Practical implications
Incorporation of kraft lignin into resole leads to adhesive with improved mechanical properties.
Originality/value
It was found that LPF resin is better than PF resin from the economical point of view and has the better mechanical properties.