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ANALYZING THE EFFECT OF BLENDING RATIO AND SPINNING SYSTEM ON THE PROPERTIES OF BAMBOO/COTTON FABRICS DYED WITH ACORN DYESTUFF
Get PDFIn the context of sustainable development goals, a diverse array of contributing studies has emerged within the textile sector. It is evident that the majority of these studies encompass both legal and customer obligations. The objective of contemporary businesses is to manufacture products that demonstrate a high level of environmental sensitivity. For instance, the objective is to reduce the quantity of waste products, to achieve energy-efficient production, to minimize the amount of chemicals employed, to reduce water consumption, to utilize energy derived from renewable sources, and thus to diminish the carbon footprint. From an environmental standpoint, the chemicals utilized in textile product manufacturing have emerged as a significant consideration. It is preferable that the chemicals employed in the dyeing process (dyestuffs, bleaching agents, softeners, etc.) are environmentally sensitive. Furthermore, the use of organic dyes in the dyeing process is also employed as a means of obtaining a more sustainable product. In the context of this study, the production of bamboo/cotton yarn was conducted at varying blend ratios (67/33%, 50/50%, and 33/67%) through the use of three distinct production methods (open end, vortex, and ring systems). Single jersey knitted fabrics were produced using these yarns with the same production parameters. Subsequently, the fabrics were dyed using acorn natural dyestuff. Pilling, fastness and CIELab analyses were performed on the fabric samples, and the results were subjected to statistical analysi
INVESTIGATION OF THE PRODUCTION OF TRICLOSAN/CHITOSAN NANOCAPSULES FOR FUNCTIONAL SURFACE APPLICATIONS
Get PDFThis study focuses on producing monodisperse nanocapsules with a triclosan/chitosan core-shell structure using the coaxial electrospray method. The coaxial electrospraying method enables the production of core/shell structured nanocapsules in a single step. The effects of flow rate, core-to-shell flow rate ratio, and needle size on the coaxial electrospray process were systematically analyzed. The resulting nanocapsule structures were characterized using scanning electron microscope (SEM), transmission electron microscope (TEM) and size measurements. The experiments demonstrated that fibrillation more likely occurred when the chitosan content was highest
Exploring digital competence’s impact on faculty well-being through SEM-SVM analysis
Get PDFThis research aims to explore the impact of digital teaching competence on faculty career well-being, teacher self-efficacy, and the moderating role of pedagogical content knowledge within the context of colleges in Pakistan. A quantitative approach was adopted, involving 266 faculty members from various academic programs in colleges across Pakistan. Data were collected through an online survey using validated scales adapted from prior research. The study used partial least squares structural equation modeling (PLS-SEM) to analyze the relationships between constructs. Support vector machine (SVM) analysis was conducted using JASP software to enhance predictive accuracy and identify the importance of key features in the dataset. The results confirm that digital teaching competence significantly impacts faculty career well-being and teacher self-efficacy. Teacher self-efficacy mediated the relationship between digital teaching competence and faculty career well-being, providing deeper insights into this linkage. Furthermore, pedagogical content knowledge moderated the effect of digital teaching competence on faculty career well-being, emphasizing its critical role. The inclusion of SVM analysis revealed the significance of variables such as psychological factors and AI exposure in influencing predictive performance, further validating the robustness of the findings. This study contributes to the existing literature by demonstrating the critical role of digital teaching competencies in enhancing faculty members’ well-being and effectiveness. It underscores the need for targeted professional development programs that integrate technology and pedagogy, ultimately fostering a more supportive educational environment for faculty and improving overall teaching quality
EFFECTS OF LIGHT SOURCES ON ILLUMINANCE DIFFERENCE AND COLOR DIFFERENCE FOR DYED FABRICS
Get PDFUnder various light sources, the color of dyed fabrics could be observed in different ways. In this study, the red (R), green (G) and blue (B) dyed fabrics were evaluated through color difference (ΔE) and illuminance difference (ΔI) under daylight (D65), fluorescence (F, TL84, CWF), and ultraviolet (UV) lights. It was found that when D65, a standard daylight illuminant, is used as the reference, ΔE value under TL84 and CWF light sources was not significantly different. Therefore, D65 can be complemented by TL84 and CWF for color evaluation to enhance accuracy. The study also highlighted that using a 45-degree viewing angle yielded the most objective color evaluation results. This angle provides optimal conditions for observing light reflection, contributing to more reliable color evaluation. Additionally, dye concentration had a significant impact on color evaluation. An incorrect dye concentration can alter the ability of fabric to absorb light, leading to inaccurate evaluations. Furthermore, washing cycles also affect the colorfastness of dyed fabrics, with increased washing leading to a brighter appearance and higher light reflection
EVALUATING BIODEGRADATION RATES IN NEAT PCL- AND PCL/PLA-BASED BIOCOMPATIBLE TUBULAR SCAFFOLDS
Get PDFVascular grafts are synthetic tubular structures that play an important role in replacing damaged vessels in the treatment of cardiovascular diseases. Existing grafts, especially in small-diameter vessels, face persistent issues such as thrombosis, immune rejection, and mechanical limitations. Vascular grafts designed with an innovative perspective to overcome these deficiencies are tubular scaffolds with a biodegradable structure and a layered design that mimics the native artery structure. This study focuses on the development of biodegradable and biocompatible tubular scaffolds with randomly distributed and radially oriented fibers in different layers to replicate the native structure of artery, utilizing neat polycaprolactone (PCL) and PCL/polylactic acid (PLA) blend with 4/1 polymer blend ratio. Electrospinning technique is employed to fabricate tubular fibrous structures. The biodegradation profiles of these scaffolds are assessed at 3, 6, and 9 months, with comparative analyses conducted to explore how polymer type and orientation level influence degradation rates and the structural integrity of the materials over time. The findings reveal that scaffolds with randomly distributed fibers exhibit higher biodegradation rates compared to those with oriented fibers, particularly in the PCL/PLA blends. Specifically, the study identifies PCL_R as having the highest degradation rate at 61% weight loss by the 9th month. Importantly, while PCL is known for its slow degradation, the high molecular weight of PLA leads to a slower degradation profile in the PCL/PLA samples. These insights underscore the critical role of scaffold morphology and composition in optimizing the performance and functionality of vascular grafts, highlighting the need for scaffolds that support cellular activities while effectively degrading to facilitate tissue regeneration without toxic effects
Emerging trends in food consumer behavior in Romania: A PLS-SEM approach
Get PDFThe agri-food market is in constant flux, influenced by economic, social, and technological factors, as well as recent challenges such as economic and health crises. In this context, consumer behavior adjusts dynamically under the influence of needs, desires, and environmental factors, aligning with market demands and conditions. The proposed research focuses on emerging trends in food consumer behavior in Romania, emphasizing the determinants of economic decision-making. To this end, data was collected through a questionnaire and processed using partial least squares structural equation modelling (PLS-SEM), revealing the role of key factors shaping consumer behavior. The study identified two major categories of influential factors in food consumption within the Romanian market: determining factors (age, gender, income, and education) and sensitive factors (consumer psychology and market characteristics). These factors contribute to the development of behaviors aimed at saving, responsible consumption, and a healthy lifestyle. Based on the research findings, the study proposes measures to support responsible consumption and facilitate decision-making processes, considering the shared interests of consumers and retailers in adapting to current market trends
ADSORPTION OF METHYLENE BLUE DYE FROM AQUEOUS SOLUTION USING BIO-WASTE POPLAR FIBER
Get PDFPoplar fiber corresponds to the seed hairs of the Populus genus trees and is a naturally abundant lignocellulosic fiber with the features of thin-walled large lumen, lightweight and hydrophobic properties. Based on the structure and properties exhibited by poplar fiber nominate it as a highly favored adsorbent material for cationic dyes. This study aims to determine the adsorption efficiency for methylene blue (MB) dye with chemically enhanced poplar fibers and compare its capacity with milkweed fibers. Prior to adsorption experiments, the fibers were treated with NaOH solution to remove the wax coating attached on the fiber surface. Adsorption studies were performed in a batch system using dye solution with initial dye concentration of 50 mg L-1 . The adsorbent dosage was evaluated at 10 g L-1 amount, with contact time of 3 h and without pH adjustment. After the experiments, the remaining dye concentration in liquid was quantified in UV-Vis spectrophotometry. The results revealed that poplar fiber exhibited higher adsorption capacity compared with milkweed fiber. Poplar fibers were efficient to decolorize MB dye solution, reaching a higher color removal percentage than milkweed fibers. It can be concluded that poplar fibers were alternative adsorbents for removing cationic dyes due to their hollow structure
Spring
No full textTématem diplomové práce jsou změny v přírodě. Na místě
kde vládne ticho a naprostý klid může být člověk jen sám se sebou - se svými myšlenkami, klidná příroda nabízí ideální místo pro jejich utřídění. Starosti tu alespoň na chvíli utichnou, nebo si člověk uvědomí jak zbytečné vlastně jsou. Dají se zde nalézt odpovědi na složité otázky, nebo jen na chvilku jednoduše bloumat a užívat si chvíle naprostého klidu bez lidí. Pokud není šance soustředit se v hlučném městě je les ideálním místem. Jenže příroda je nabitá obrovským potenciálem živého, které se probouzí a způsobuje změny ve strukturách, barvách.. Sama se může změnit v hlučné velkoměsto, které téměř ani v noci nenachází klid. Jaro je jako bouře co se přelévá přes vše živé. V tomto chaotickém víření do sebe jednotlivé tvary splývají, navzájem si své hranice stírají až k nerozlišitelnosti a přesto mají své pevné body - kmeny stromů i keřů jsou stále na svém místě - jako kotevní body v rozostřeném chaosu, kterého jsou součástí a i vizuálně s ním splývají, když je tato bouřlivá energie obklopuje ze všech stran, deformuje je skrývá a vymazává je z popředí, kterému se jejich ostré linie a struktury těšili během období klidu. Stávají se z nich tak strnulé objekty v pozadí zahalované vírem nových tvarů, kdy příroda sama sebou prorůstá. Tento proces změn může mít intenzivní dopad i na člověka, který je také jejich součástí a na kterého rovněž působí. Zachvacuje emoce, které mohou být jak radostné a přinášet potěšení z přírody, tak i negativní a působit nejen ve smyslové, ale i ve vizuální podobě jako jízda na horské dráze a vyvolávat závratě. Proces vzniku díla je ztvárňováním momentů, kdy skutečnost nenaplňuje vše - na rozdíl od vědomí. Skutečnost je zářivá, barevná a živá, ale uvnitř vědomí je toto období jen plné neklidu, nejistoty a je spíše temné a bouřlivé. Výtvarný projev poskytuje možnost ke ztvárnění vlastních představ, díky tomu je i způsobem jak se lze vyrovnat s tímto obdobím. Je zdrojem klidu a díky soustředění se na něj i možností tříbení si myšlenek, odpočinku ve vlastním světě a radosti z výsledků. Fotografie a videa zachycují prchavé okamžiky a následnou manipulací se nich vytváří svět nacházející se za pouhým okem viditelnou skutečností. Tato práce propojuje výtvarný projev s vlastní
představou vzniklou ze zážitku z návštěvy přírody a jejím působením.The topic of the thesis is changes in nature. In a place where silence and complete peace reign, a person can only be with themselves - with their thoughts, peaceful nature offers an ideal place for sorting them out. Worries will at least calm down for a while, or a person will realize how unnecessary they actually are. Here you can find answers to complex questions, or just wander for a while and enjoy moments of complete peace without people. If there is no chance to concentrate in a noisy city, the forest is an ideal place. But nature is full of the enormous potential of living things, which awakens and causes changes in structures, colors.. It can itself turn into a noisy city, which almost never finds peace even at night. Spring is like a storm that spills over all living things. In this chaotic whirlwind, individual shapes merge into each other, blurring their boundaries to the point of indistinguishableness, and yet they have their fixed points - the trunks of trees and bushes are still in their place - as anchor points in the blurred chaos of which they are a part and visually merge with it, when this turbulent energy surrounds them from all sides, deforms them, hides them and erases them from the foreground that their sharp lines and structures enjoyed during the period of calm. They become rigid objects in the background, shrouded in a whirlwind of new shapes, when nature grows through itself. This process of change can also have an intense impact on the person who is also a part of them and on whom it also affects. It captures emotions that can be both joyful and bring pleasure from nature, as well as negative and act not only in sensory but also in visual form like a roller coaster ride and cause dizziness. The process of creating a work is the depiction of moments when reality does not fulfill everything - unlike consciousness. Reality is bright, colorful and lively, but inside consciousness this period is only full of restlessness, uncertainty and is rather dark and stormy. Artistic expression provides the opportunity to portray one's own ideas, thanks to which it is also a way to cope with this period. It is a source of peace and, thanks to focusing on it, the possibility of refining one's thoughts, resting in one's own world and enjoying the results. Photographs and videos capture fleeting moments and, by subsequent manipulation, create a world that is behind the naked eye, a visible reality. This work connects artistic expression with one's own idea arising from the experience of visiting nature and its effects
Nediskriminující, živá, bezpečná místa s jasnou identitou
No full textŘeka ve městě poskytuje prostor pro každodenní rekreaci, je součástí obrazu města, přispívá k ochlazování prostoru, může poskytovat různé druhy prostor, zároveň je z důvodu možné záplavy a přítomnosti sociálně patologických jevů přináší nábřeží, náplavky a podmostí řadu problémů. Práce se zaměřuje na definování identity, zlepšení prostupnosti a využití sekvence míst kolem Vltavy mezi železničním a Trojským mostem v Praze a dále detailněji na oblast Kosárkova nábřeží, náměstí Jana Palacha a Klárova, kde řeší neutěšený stav veřejného prostoru a navrhuje možné doplnění prostoru veřejnou budovou.
Pro pražské břehy jsou typické náplavky jakožto promenády podél řeky a život, který přitahují. Ať už jako nerušené cesty pro běžce podél vody nebo místa konání trhů a festivalů. Tato místa představují esenci městského života, kdy není třeba utíkat za město do přírody, protože je součástí říční krajiny.
Tato blízkost řece však není samozřejmá po celé délce a chodci i cyklisté jsou nuceni mačkat se na nábřeží spolu s auty a tramvajemi. Přímo k řece se dostanou jen prostřednictvím šlapacích lodiček či veslic za nemalý poplatek. Řeka však nemá být primárně komerčním prostorem, je místem veřejným, demokratickým, přístupným bez zbytečných bariér jakéhokoli druhu.
Charakter prostorů podél řeky se mění stejně jako prostupnost. V některých místech jsou břehy zcela nepřístupné, jinde odrazují cedule "Zákaz vstupu" nebo chybí důvod se zde zdržovat, a prostor slouží jen k liniovým aktivitám.
Řešené území je rozděleno do tří typů zásahů - velké, malé a zásahy typu "čištění". Do detailu jsou zpracovány lokality náměstí Jana Palacha a Klárov.The river in the city provides space for everyday recreation, forms part of the city's image, contributes to cooling the urban environment, and offers diverse types of spaces. At the same time, however, the riverfront, embankments, and under-bridge areas can bring challenges due to the risk of flooding and the presence of socially pathological phenomena.
This work focuses on defining identity, improving accessibility, and enhancing the use of a sequence of spaces along the Vltava River between the Railway Bridge and the Troja Bridge in Prague. Particular attention is given to the areas of Kosárkovo Embankment, Jan Palach Square, and Klárov, where it addresses the neglected condition of public space and proposes its enhancement, including the addition of a public building.
The Prague riverbanks are characterized by embankments that serve as promenades and attract vibrant urban lifebe it peaceful routes for runners along the water or venues for markets and festivals. These areas embody the essence of urban life, where there is no need to flee the city to experience natureit is inherently part of the river landscape.
However, this proximity to the river is not consistent along its entire length. Pedestrians and cyclists are often forced to share narrow spaces on the embankment with cars and trams. Direct access to the water is limited, often requiring pedal boats or rowboats for a considerable fee. Yet the river should not primarily serve as a commercial spaceit should be a public, democratic, and easily accessible place, free of unnecessary barriers of any kind.
The character and permeability of riverside spaces vary. In some places, the banks are completely inaccessible; in others, warning signs like "No Entry" are discouraging, or there's simply no reason to lingerthe space is reduced to a transit corridor.
The project area is divided into three types of interventionslarge-scale, small-scale, and "clean-up" interventions. The areas of Jan Palach Square and Klárov are explored in greater detail
Towards a greener future: Renewable energy and economic sustainability in Europe
Get PDFThe transition towards the use of renewable energy sources has been considered for a long time concerning their capabilities in promoting economic sustainability. Therefore, this study aims to examine the role of renewable energy in achieving economic sustainability in the European region. Empirical data was collected with the help of Eurostat to analyze the proposed relationship. Macro-level data from twenty-eight (28) European countries is collected, and the final dataset contains statistics between 2014 and 2023. Analyzing the findings of ordinary least squares and system GMM regression tests, as well as the different proxies of both renewable energy and economic sustainability, a positive relationship is found between renewable energy and economic sustainability. Moreover, increased availability of renewable energy (for instance, wind, solar, and the like) is regarded as a way of enhancing economic performance, creating more jobs, and saving the cost of energy. The outcomes also indicate that upgrading renewable energy infrastructure improves economic growth, promotes innovation, and stabilizes the economy’s growth in the long run. This study adds to the current discourse on the efficiency of renewable energy and opens up a new area of research for scholars and policymakers