scholarly journals An Eco-Friendly Approach to Low-Temperature and Near-Neutral Bleaching of Cotton Knitted Fabrics Using Glycerol Triacetate as an Activator

2021 ◽  
Author(s):  
Yu Zhou ◽  
Guolin Zheng ◽  
Jinfang Zhang ◽  
Qiang Wang ◽  
Man Zhou ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Low Temperature ◽  
Textile Industry ◽  
Cost Effective ◽  
Knitted Fabrics ◽  
Factors Affecting ◽  
Bleach Activator ◽  
Glycerol Triacetate ◽  
The Relationship ◽  
Environmentally Friendly Approach

Abstract Near-neutral bleaching of cotton fabrics at low temperature is of great importance for saving energy and ecological friendliness in textile industry. In this work, glycerol triacetate (GT) was investigated as an activator of hydrogen peroxide (H2O2) for low temperature bleaching of cotton knitted fabrics, and satisfactory whiteness was obtained. The bleaching properties of H2O2/GT system for cotton was assessed by the CIE whiteness index, H2O2 decomposition rate, concentration of generated peracetic acid (PAA) and bursting strength. Possible factors affecting the performance of H2O2/GT bleaching system were discussed in detail. Adding only 10 mmol/L GT to the hydrogen peroxide solution (60 mmol/L) to bleach cotton knitted fabrics at 60 ℃ for 60 min, the WI was significantly increased from 52.09 to 68.92. By using benzenepentacarboxylic acid as a fluorescent probe for hydroxyl radical (HO·) detection, it was found that GT could clearly promote HO· generation and the concentration of HO· closely related to the WI of cotton fabric. Furthermore, the bleaching mechanism of H2O2/GT system to cotton was proposed by exploring the relationship between WI and HO· concentration. As a bleach activator, GT has more economical benefits and better solubility in water than that of TAED. The H2O2/GT system may provide a cost-effective and environmentally friendly approach as alternative to conventional alkaline high-temperature bleaching of cotton.

scholarly journals Relationship between the Voluntary Instrument of CSR in the Textile Industry in the Czech Republic and Financial Performance

2018 ◽  
Vol 26 (5(131)) ◽  
pp. 8-12 ◽  
Author(s):  
Josef Krause
Keyword(s):  
Corporate Social Responsibility ◽  
Czech Republic ◽  
Financial Performance ◽  
Textile Industry ◽  
Environmentally Friendly ◽  
Wilcoxon Test ◽  
The Czech Republic ◽  
Corporate Social ◽  
The Relationship ◽  
Environmentally Friendly Approach

The paper deals with the relationship between an environmentally friendly approach on the part of companies and financial performance. The paper emphasises that corporate social responsibility is an important issue in the strategic management of companies. The paper examines companies in the textile industry with an environmentally friendly certification in the Czech Republic, and then compares their indicator of profitability with companies in the textile industry without this chosen certification. The Wilcoxon test and t-test are used for the comparison. No statistically significant differences are confirmed. The limitations of the research are also discussed in the article.

Low Temperature Bleaching of Cotton with a Novel Cationic Activator

2012 ◽  
Vol 608-609 ◽  
pp. 1391-1394
Author(s):  
Yan Li Li ◽  
Zhen Dong Liu ◽  
Xiao Ning Wang
Keyword(s):  
Hydrogen Peroxide ◽  
Low Temperature ◽  
Experimental Method ◽  
Dwell Time ◽  
Bleaching Process ◽  
Fiber Damage ◽  
Peroxide Bleaching ◽  
Bleach Activator ◽  
Fabric Strength ◽  
Activated Peroxide System

A new cationic bleach activator (CBA) N-[4-pyridmoniomethyl)benzoyl]caprolactam bromide (PBCB) was synthesized and evaluated in a hot peroxide bleaching process. The effects of time, temperature and the concentrations of hydrogen peroxide and activator on the bleaching of cotton fabric were investigated using an orthogonal experimental method. The optimal bleaching process of PBCB-activated peroxide system was 5g/L H2O2, 0.5g/L CBA, 40°Cand 45min dwell time under neutral pH, with which a whiteness equivalent to that of the conventional-bleaching system was achieved, but the PBCB system resulted in almost no fiber damage based on fabric strength.

scholarly journals Factors affecting the production and measurement of hydrogen peroxide in honey samples

2021 ◽  
Author(s):  
Annabel Guttentag ◽  
Krishothman Krishnakumar ◽  
Nural Cokcetin ◽  
Elizabeth Harry ◽  
Dee Carter
Keyword(s):  
Hydrogen Peroxide ◽  
Antibacterial Activity ◽  
Screening Tool ◽  
Antimicrobial Properties ◽  
Rapid Loss ◽  
Factors Affecting ◽  
Highly Active ◽  
Production Of Hydrogen ◽  
Almost All ◽  
The Relationship

Many Australian native honeys possess significant antimicrobial properties due to the production of hydrogen peroxide (H2O2) by glucose oxidase, an enzyme derived from the honeybee. The level of H2O2 produced in different honey samples is highly variable, and factors governing its production and stability are not well understood. In this study, highly active Australian honeys that had been stored for >10 years lost up to 54 % of their antibacterial activity, although almost all retained sufficient activity to be considered potentially therapeutically useful. We used a simple colourimetric assay to quantify H2O2 production. Although we found a significant correlation between H2O2 production and antibacterial activity across diverse honey samples, variation in H2O2 only explained 47 % of the variation observed in activity, limiting the assay as a screening tool and highlighting the complexity of the relationship between H2O2 and the killing power of honey. To further examine this, we tested whether H2O2 detection in honey was being inhibited by pigmented compounds and if H2O2 might be directly degraded in some honey samples. We found no correlation between H2O2 detection and honey colour. Some honey samples rapidly lost endogenous and spiked H2O2, suggesting that components in honey, such as catalase or antioxidant polyphenols, may degrade or quench H2O2. Despite this rapid loss of H2O2, these honeys had significant peroxide-based antibacterial activity, indicating a complex relationship between H2O2 and other honey components that may act synergistically to augment activity.

THE RELATIONSHIP BETWEEN THE PRICE OF PETROLEUM PRODUCTS AND THE COMPETITIVENESS OF TEXTILE ENTERPRISES IN RUSSIA

2021 ◽  
Vol 1 (181) ◽  
pp. 117-125
Author(s):  
K.К. Glyuzitskiy ◽  
◽  
A.V. Korenevskaya ◽  
Keyword(s):  
Textile Industry ◽  
World Market ◽  
Price Policy ◽  
Petroleum Products ◽  
Key Factors ◽  
Factors Affecting ◽  
Synthetic Fibers ◽  
Oil Market ◽  
The Relationship ◽  
Synthetic Fabric

The article discusses trends in the textile industry, the pace and direction of use of synthetic fabric, key factors affecting the competitiveness of textile enterprises specializing in synthetic fibers. The necessary components are identified for the effective functioning and rapid entry into the world market of competitive enterprises in the textile industry of Russia. The paper addresses the problems of volatility of crude oil and the related instability in the price policy of synthetic fabric. The author concludes that it is necessary to actively stimulate and develop textile enterprises, considering the change in the oil market in 2020, as well as the current expansion of the use of synthetic fabrics.

Daily Settlement Rates of the Zebra Mussel, Dreissena polymorpha, on an Artificial Substrate Correlate with Veliger Abundance

1994 ◽  
Vol 51 (4) ◽  
pp. 856-861 ◽  
Author(s):  
André Martel ◽  
Andrea F. Mathieu ◽  
C. Scott Findlay ◽  
Stephen J. Nepszy ◽  
Joseph H. Leach
Keyword(s):  
Water Column ◽  
Late Stage ◽  
Zebra Mussel ◽  
Dreissena Polymorpha ◽  
Cost Effective ◽  
Effective Control ◽  
Physical Factors ◽  
Factors Affecting ◽  
Daily Monitoring ◽  
The Relationship

The relationship between daily settlement rates and local concentrations of veligers of the zebra mussel, Dreissena polymorpha, was investigated using plankton sampling and scouring pad collectors. A total of 102 plankton and 136 collector samples were taken from a nearshore site near Wheatley, Ontario, in west-central Lake Erie, over 17 consecutive d in August 1992. Results demonstrate a strong correlation between daily settlement rates and daily concentrations of late-stage (competent) veligers in the water column (determined at shell lengths ≥ 170 μm; r = 0.93–0.98; p < 0.001; log10-transformed data). Variations in settlement rates of 1–3 orders of magnitude occurred within 24–96 h. Results also suggest that wind-induced hydrodynamics can affect settlement rates of zebra mussel larvae; the period used to monitor settlement (24 h) was much shorter than that employed (~1–2+ wk) in previous studies. Daily monitoring of concentrations of late-stage veligers in the water column as well as settlers (fibrous collectors) may help to identify biological and physical factors affecting short-term variability in settlement; it may also prove advantageous for industries where early detection of colonization by the zebra mussel is critical for cost-effective control of this invasive mollusc.

The Relationship of Hydrogen Peroxide Exposure Protocol to Bleaching Efficacy

2013 ◽  
Vol 38 (2) ◽  
pp. 177-185 ◽  
Author(s):  
SR Kwon ◽  
PW Wertz ◽  
DV Dawson ◽  
DS Cobb ◽  
G Denehy
Keyword(s):  
Hydrogen Peroxide ◽  
Linear Regression ◽  
Color Change ◽  
Linear Modeling ◽  
Tooth Color ◽  
Factors Affecting ◽  
Pulp Cavity ◽  
Relationship Of ◽  
The Relationship

SUMMARY The purpose of this study was to compare two in-office bleaching methods with respect to tooth color change and level of hydrogen peroxide penetration into the pulp cavity and to evaluate relationships between penetration level and color change. Eighty extracted canines were exposed to two different bleaching regimens (conventional vs sealed bleaching technique). After exposure to 38% hydrogen peroxide gel for one hour, hydrogen peroxide amount was estimated spectrophotometrically. Color change was measured per Commission Internationale de l'Eclairage methodology. Linear regression was used to evaluate factors affecting color change, including bleaching technique. The conventional and sealed bleaching groups showed no difference for any color change parameters (ΔL, Δa, Δb, ΔE); however, there was significantly greater hydrogen peroxide penetration in the conventional bleaching group (p&lt;0.05). Linear modeling of the change in lightness (ΔL) showed that the increase in lightness tended to be greater for teeth with lower initial L* values (r=−0.32, p&lt;0.05). After adjustment for initial L*, there was no evidence that ΔL differed with hydrogen peroxide penetration levels (p&gt;0.05) or bleaching technique (mean group difference in ΔL=0.36; p&gt;0.05).

The number of employed as a macroeconomic indicator of working time dynamics

2020 ◽  
Vol 16 (5) ◽  
pp. 935-945
Author(s):  
I.A. Zaikova
Keyword(s):  
Comparative Analysis ◽  
Manufacturing Sector ◽  
Working Hours ◽  
Working Time ◽  
Labor Costs ◽  
Factors Affecting ◽  
Time Dynamics ◽  
Developed Economies ◽  
The Relationship ◽  
Macroeconomic Indicator

Subject. The working time of workers at any stage of economic development is a value reflecting the level of labor productivity. Any progress in productivity contributes to changes in the volume of labor costs and the number of employed. Depending on the relationship between the total volume of labor costs and the number of employed, the duration of working time per one worker may change (it may increase, decrease, or remain unchanged). Objectives. The study aims to confirm the importance of such a macroeconomic indicator as the number of employed in varying working hours. Methods. The study rests on the comparative analysis of countries with developed economies based on some indicators like dynamics of the working time fund, dynamics of the number of employed, average number of hours worked during the year per employee, etc. The analyzed timespan is 25 years (from 1991 to 2016). Results. The comparative analysis revealed that in the non-production sphere and the economy as a whole the macroeconomic determinants correlate so that the length of working time per worker reduces. When considering the analysis results for the manufacturing sector, no single trend was identified. Conclusions. One of the key factors affecting the change in working hours is the number of employed. The relationship between the working time fund and the number of employed directly determines the dynamics of working time per worker.

Gebirgswaldpflege – es kommt auf den Standort an | Mountain silviculture – it all depends on the site

2001 ◽  
Vol 152 (5) ◽  
pp. 169-176 ◽  
Author(s):  
Monika Frehner
Keyword(s):  
Nature Conservation ◽  
Low Temperature ◽  
Tree Species ◽  
Forest Stand ◽  
Ground Vegetation ◽  
Mountain Forests ◽  
Research Projects ◽  
Snow Mould ◽  
The Relationship ◽  
Protection Forests

The article shows that knowledge of the site of a particular forest stand, together with research results and experience, can provide information that is important for the cultivation of mountain forests, including knowledge of the composition of the tree species and the structure and growth capacity of natural forest. Furthermore, certain sites can, thus, be characterized by factors that influence restocking, such as snow mould,lush ground vegetation or low temperature. The guidelines«minimale Pflegemassnahmen» – «Minimal tending of protection forests» (WASSER und FREHNER, 1996) are based on this principle. For individual sites, warnings about natural dangers such as rock fall or statements concerning nature conservation can be made (e.g., the occurrence of tree species, suitability as a biotope for Capercaille). In conclusion, two research projects on the relationship between site and natural dangers will be presented.

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