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NANOFIBER MESHES FOR ABDOMINAL HERNIA REPAIR – CHALLENGES AND OPPORTUNITIES 纳米纤维网用于腹疝修补——挑战与机遇
Pub Date : 2019-11-05 DOI: 10.35530/tt.2019.40
G. Pîrcălăbioru, B. Tihauan, Mădălina Axinie, A. Ivanof, S. Maier
Implantation of any prosthetic material triggers a cascade of events that mark the initiation of the healing process. In the case of abdominal mesh implantation, the course of inflammation and wound healing are paramount. The biomaterials employed as a medical deviceare in close proximity with devitalized tissue parts which can promote microbial colonization resulting in infection and subsequently impaired wound healing. The advent of nanofiber based systems provides novel opportunities to develop hernia meshes with increased biocompatibility and good material strength. Electrospun nanofiber matrices exhibit morphological similarities to the natural extra-cellular matrix (ECM), with ultrafine continuous fibers, high porosity high surface-to-volume ratio, and variable pore-size distribution. This mini review summarizes the advantages and challenges associated to nanofiber systems.
植入任何假体材料都会引发一系列事件,标志着愈合过程的开始。在腹部补片植入的情况下,炎症过程和伤口愈合是最重要的。作为医疗器械的生物材料靠近失活的组织部分,可以促进微生物定植,导致感染并随后损害伤口愈合。纳米纤维系统的出现为开发具有更高生物相容性和良好材料强度的疝网提供了新的机会。静电纺丝纳米纤维基质具有超细连续纤维、高孔隙率、高表面体积比和可变孔径分布等特点,与天然细胞外基质(ECM)具有形态学上的相似性。这篇综述总结了纳米纤维系统的优点和挑战。
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引用次数: 0
THE TEARING STRENGTH ANALYSIS OFDENIM FABRICS WITH DIFFERENT WEFT YARN TYPE AND WEFT YARN LAYOUT 不同纬纱类型和纬纱布置的牛仔布织物撕裂强度分析
Pub Date : 2019-11-05 DOI: 10.35530/tt.2019.27
M. Avcı, E. Sarıoğlu, G. K. Günaydin
Denim fabrics which are highly demanded products among the world have high consumption rate in the textile market. Those fabrics may be utilized for different purposes. Durability, elasticity, wearingresistance are the important expected properties from denim fabrics. Tearing resistance of denim fabrics in use is another parameter that should be considered. This study includes the investigation of tearing properties of denim fabrics produced from single core (Polyethylene terephthalate/Polytrimethylene terephthalate (PET/PTT) bicomponent filament and elastane) and dual core (PET/PTT+elastane feeding simultaneously) spun yarns utilized as weft yarns. Denim fabrics with different layout of these weft yarns with uncovered PET/PTT bicomponent filament were produced in order to compare the tearing strength properties in warp and weft wise. Results revealed that highest tearing strength of weft wise was obtained from denim fabrics at 2F:2CY layout where two uncovered PET/PTT bicomponent filament and two PET/PTT bicomponent filament+elastane dual core-spun yarn were used consecutively in the layouts. The lowest tearing strength was found among the denim fabrics at 1F:6CY layout where one uncovered PET/PTT bicomponent filament and six PET/PTT bicomponent filament+elastane dual core-spun yarns were used consecutively in the layouts. According to statistical evaluation; Weft yarn type, weft yarn layout and their interaction in the fabric were found to having significant effects on tearing strength for both warp and weft direction of denim fabric at significance level of 0.05.
牛仔面料是世界上需求量很大的产品,在纺织品市场上有着很高的消费率。这些织物可用于不同的目的。耐用性、弹性、耐磨性是牛仔布的重要性能。牛仔面料在使用中的抗撕裂性是另一个需要考虑的参数。本文研究了单芯(聚对苯二甲酸乙二醇酯/聚三甲基对苯二甲酸乙二醇酯(PET/PTT)双组分长丝和弹性纤维)和双芯(PET/PTT+弹性纤维同时进料)纱线作为纬纱生产的牛仔织物的撕裂性能。为了比较涤纶/PTT双组分长丝在经纱和纬向上的撕裂强度性能,生产了这些纬纱在不同布局下的牛仔织物。结果表明,在2F:2CY布局中,连续使用两根未覆盖的PET/PTT双组分长丝和两根PET/PTT双组分长丝+弹性纤维双芯纺纱时,牛仔织物纬向撕裂强度最高。在1F:6CY布局中,连续使用1根无盖PET/PTT双组分长丝和6根PET/PTT双组分长丝+弹性纤维双芯纺纱,牛仔织物的撕裂强度最低。根据统计评价;纬纱类型、纬纱布置及其在织物中的相互作用对牛仔织物经向和纬向撕裂强度均有显著影响,且显著水平为0.05。
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引用次数: 0
KNITTED MATERIALS CAPACITY FOR VIBRATION PROTECTION APPLICATIONS 针织材料的振动保护应用能力
Pub Date : 2019-11-05 DOI: 10.35530/tt.2019.01
M. Blaga, N. Seghedin
The present work is a synthesis of the author’s previous research on weft and warp knitted fabrics response under dynamic stress and their capacity of vibration damping. The main objective of this research is to experimentally investigate the vibration behaviour of these fabrics with an existing testing method, in order to understand how the fabric structural parameters affect their vibration isolation performance. The authors have focused their interest on the knitted fabrics characterization through their natural frequencies, which were determined by employing the free vibrations method. The natural frequency is the rate at which an object vibrates when it is not disturbed by an outside force. A comparative fabrics analysis of the measured natural frequencies is performed and the main parameters of influence are discussed. An ideal knitted spacer fabric developed for anti-vibration purposes, should have the capacity of absorb energy efficiently, still having sufficient stiffness to avoid its collapse and an acceptable thickness in order to maintain a sense of touch and dexterity to complete the tasks. The preliminary results confirmed that knitted fabrics can be engineered and exploited as structures with vibration absorption capabilities.
本文综合了作者以往对经纬织物在动应力作用下的响应及其减振能力的研究。本研究的主要目的是利用现有的测试方法对这些织物的振动行为进行实验研究,以了解织物的结构参数如何影响其隔振性能。作者将他们的兴趣集中在针织物的特性通过其固有频率,这是由采用自由振动法确定的。固有频率是物体在不受外力干扰时的振动频率。对测量的固有频率进行了对比分析,并讨论了影响频率的主要参数。一种理想的用于抗振目的的针织隔震织物,应具有有效吸收能量的能力,仍有足够的刚度以避免其坍塌,并具有可接受的厚度,以保持触觉和灵巧性以完成任务。初步结果证实,针织织物可以作为具有吸振能力的结构进行设计和开发。
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引用次数: 3
USING STEM PRINCIPLES FOR UNDERSTANDING SMART TEXTILES’ SOLUTIONS – THE SLOVENIAN EXPERIENCE 使用stem原理来理解智能纺织品的解决方案——斯洛文尼亚的经验
Pub Date : 2019-11-05 DOI: 10.35530/tt.2019.58
Z. Stjepanovic, A. Cupar, R. Radulescu, A. Rudolf
The contribution gives an overview of the Erasmus+ project Smart textiles for STEM training – Skills4Smartex, funded by the European Commission. Presented are main objectives, aims and expected results, focused on experiences, gained through the first year’s project activities’ in Slovenia. The project aims to improve the knowledge, skills and employability of students in the fields, related to STEM (Science, Technology, Engineering, Mathematics) by providing appropriate training tools to understand multidisciplinary work through smart textiles. The main objectives of the project are: (1) Creating a Guide on smart practices meant for supporting innovation in textile enterprises; (2) Creating a Course in smart textiles, meant for multidisciplinary thinking; (3) Creating a dedicated e-learning instrument, meant for channeling the interest of VET students for "serious games"; (4) Improving the skills of students by means of practical work in constructing smart textile prototypes. The project activities began with a survey on smart/technical textiles completed by 63 textile companies at the EU level; 10 of them were from Slovenia. The aim was to identify existing opportunities for producing smart textiles in enterprises and forecasting expected occupations and work profiles for young trainees. The results will be published in a guide meant for transferring smart practices from enterprises to Vocational Education and Training (VET) schools and young students.
该贡献概述了由欧盟委员会资助的Erasmus+项目用于STEM培训的智能纺织品- Skills4Smartex。提出了主要目标、目的和预期结果,重点是在斯洛文尼亚第一年的项目活动中获得的经验。该项目旨在通过提供适当的培训工具来了解智能纺织品的多学科工作,从而提高学生在STEM(科学、技术、工程、数学)相关领域的知识、技能和就业能力。该项目的主要目标是:(1)创建智能实践指南,旨在支持纺织企业的创新;(2)开设智能纺织品课程,培养多学科思维;(3)创建一个专门的电子学习工具,旨在引导职业技术培训学生对“严肃游戏”的兴趣;(4)通过构建智能纺织品原型的实际工作,提高学生的技能。项目活动以一项由63家欧盟纺织公司完成的智能/技术纺织品调查开始;其中10人来自斯洛文尼亚。目的是确定企业生产智能纺织品的现有机会,并预测年轻学员的预期职业和工作概况。结果将发布在一份指南中,旨在将智能实践从企业转移到职业教育与培训(VET)学校和年轻学生。
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引用次数: 0
IMPROVED MOBILE BED BIOFILM REACTORS TO TREAT CELLULOSIC WASTEWATERS 改进移动床生物膜反应器处理纤维素废水
Pub Date : 2019-11-05 DOI: 10.35530/tt.2019.06
I. Moga, O. Iordache, G. Petrescu, E. Mitran, I. Sandulache, B. Doroftei, L. Secăreanu, E. Perdum, G. Pantazi
The wastewater treatment sector is a very dynamic field, in continuous development. New technologies are developed, or the existing ones are improved [1]. An efficient biological treatment is based on solid small plastic pieces (biofilm carriers) on which different types of microorganisms attach, develop and grow. This technology is known as Moving Bed Biofilm Reactor (MBBR) technology [2]. The most common materials used for the biofilm carriers’ realization are based on high density polyethylene. This technology is not yet applied for the treatment of the cellulosic wastewaters, since cellulose is hard to be removed by using conventional microorganisms that are usually used in biological wastewater treatment. Some of the authors propose an improved material for carriers to be used in tertiary treatment for textile, paper-mill or tannery wastewaters [3]. The biofilm carriers are adapted for fungal activity. The selected fungal strains (White Root Fungi) capable of removing cellulose from wastewaters [4] will be immobilized on special biofilm carriers. The improved carrier is designed to be used in a MBBR and to favour fungal development in the presence of competing bacteria. Several laboratory experiments related to the fungal attachment on the improved carriers were realized and the results are presented in the paper.
污水处理领域是一个非常有活力、不断发展的领域。开发新技术,或改进现有技术[1]。有效的生物处理是基于固体小塑料片(生物膜载体),不同类型的微生物附着,发育和生长。这项技术被称为移动床生物膜反应器(MBBR)技术[2]。用于生物膜载体实现的最常见材料是基于高密度聚乙烯。该技术尚未应用于纤维素废水的处理,因为使用通常用于生物废水处理的常规微生物很难去除纤维素。一些作者提出了一种改进的载体材料,用于纺织、造纸厂或制革厂废水的三级处理[3]。生物膜载体适合真菌活性。将选定的能够从废水中去除纤维素的真菌菌株(白根真菌)[4]固定在特殊的生物膜载体上。改进的载体被设计用于MBBR,并有利于真菌在竞争细菌存在下的发展。本文对真菌在改良载体上的附着进行了室内实验,并给出了实验结果。
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引用次数: 0
SURFACE MODIFICATION OF BIOMATERIAL FABRIC USING SUPERCRITICAL N2 JET 超临界n2射流对生物材料织物表面改性的研究
Pub Date : 2019-11-05 DOI: 10.35530/tt.2019.36
F. Khoffi, Y. Khalsi, A. Tazibt, S. Msahli, F. Heim
Textile biomaterials have been largely used over the last decades as vascular grafts, hernia meshes and heart valve leaflet [1-2]. Once implanted in vivo, the natural porosity of textile materials tends to induce exaggerated tissue ingrowth, which may prevent the implants from remaining flexible [3]. One hypothesized way to limit the foreign body reaction process is to increase the material surface roughness [4]. Supercritical N2 jet particle projection is a novel technique to provide enough velocity to micro particles to induce plastic deformation on the textile impacted surface. The aim of this study is to investigate the influence of micro particles laden supercritical N2 jet projection parameters like jet static pressure, standoff distance and particle size on the roughness of PET fabric surfaces. Results bring out that particles projected by the jet N2 SC generate craters on the surface of monofilament as well as multifilament fabric, allowing topographical modifications at the yarn scale. We found that larger particles induce larger crater diameters. Moreover, increasing the static jet pressure from 300 to 1000 bars further allows increase in the crater diameter. For a pressure of 500 bar, the standoff distance must be greater than 300 mm in order to obtain significant roughness values without breaking the PET monofilament fabrics. Thus, this treatment increased the roughness of the monofilament fabric from 0.78 μm to 1.22 μm. The results obtained in this work show that it is possible to create a roughness on a PET fabric using the N2 jet technology.
在过去的几十年里,纺织生物材料被广泛用于血管移植物、疝网和心脏瓣膜小叶[1-2]。一旦植入体内,纺织材料的天然多孔性容易导致组织过度向内生长,这可能会使植入物失去柔韧性[3]。限制异物反应过程的一种假设方法是增加材料表面粗糙度[4]。超临界N2喷射颗粒投影技术是一种为微颗粒提供足够的速度,使其在纺织品冲击表面产生塑性变形的新技术。本研究的目的是研究载微颗粒的超临界N2射流投影参数如射流静压、距离和粒径对PET织物表面粗糙度的影响。结果表明,喷射N2 SC粒子在单丝和多丝织物表面产生凹坑,允许在纱线尺度上进行地形修饰。我们发现,颗粒越大,陨石坑直径越大。此外,将静态喷射压力从300巴增加到1000巴,可以进一步增加陨石坑的直径。在500bar的压力下,为了在不破坏PET单丝织物的情况下获得显著的粗糙度值,距离必须大于300mm。因此,该处理将单丝织物的粗糙度从0.78 μm提高到1.22 μm。研究结果表明,利用N2喷射技术在PET织物上产生粗糙度是可能的。
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引用次数: 0
NANOCOATING OF POLYESTER FABRIC WITH GRAPHENE OXIDE 氧化石墨烯纳米涂层在聚酯织物中的应用
Pub Date : 2019-11-05 DOI: 10.35530/tt.2019.17
Beyza Doğan, Ş. Uğur, Banu Esencan Turkaslan
GO is easily dispersed in solvents, dielectric property, transparency, electronic features can be adjusted due to the superior mechanical properties and areas of use are expanding day by day. In this study, graphene oxide was obtained from graphite by using modified Hummers method and then applied to polyester fabric surface according to multilayer coating method. Contrary to the traditional Hummers method in the literature, this study was carried out without the use of NaNO₃ in order to be environmentally friendly. Based on the Layer-by-Layer coating method, GO based nano films have been applied to the polyester fabric surface. After obtaining the GO based nanocomposite polyester fabrics, it was treated with Na₂S₂O₄ and NaBH₄ in order to obtain RGO structure and GO reduction was achieved. A thin coating layer was observed in SEM analysis of the reduced graphene oxide (RGO) and GO coated fabrics. In the EDS analysis, increase in the amount of C and the decrease in the amount of O were determined after the reduction process. The most striking feature of graphene oxide was applied to all fabrics with a 4-probe measuring device and the best result was observed in the polyester fabric which was coated with Na₂S₂O₄ in 10 layer 5 minutes with Layer-by-Layer coating method with 1.47 × 1̄0 ³ S/cm².
氧化石墨烯易分散于溶剂中,介电性能、透明度、电子特性均可调节,因其优越的机械性能和使用领域正日益扩大。本研究以石墨为原料,采用改进的Hummers法制备氧化石墨烯,然后采用多层涂覆法将氧化石墨烯涂覆在涤纶织物表面。与文献中传统的Hummers方法相反,为了环保,这项研究没有使用NaNO₃。基于逐层涂布的方法,将氧化石墨烯基纳米薄膜应用于涤纶织物表面。得到氧化石墨烯基纳米复合涤纶织物后,用Na₂S₂O₄和NaBH₄对其进行处理,得到还原氧化石墨烯结构,实现了氧化石墨烯还原。SEM分析发现,还原氧化石墨烯(RGO)和氧化石墨烯涂层织物表面有一层薄薄的涂层。在EDS分析中,测定了还原过程后C的量增加,O的量减少。利用4探针测量装置将氧化石墨烯最显著的特征应用到所有织物上,采用逐层涂布法,在105min内涂布Na₂S₂O₄,涂布效果最佳,涂布率为1.47 × 1′0³S/cm²。
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引用次数: 0
RESEARCH ON DESIGNING COMPOSITE TECHNIQUES FOR OBTAINING THE 3D HYBRID COMPOSITES WITH CONDUCTIVE AND SEMICONDUCTIVE PROPERTIES FOR SENSORS AND ACTUATORS 为获得具有导电和半导体性能的传感器和执行器用三维杂化复合材料设计复合技术的研究
Pub Date : 2019-11-05 DOI: 10.35530/tt.2019.45
R. Aileni, L. Chiriac
In the paper are presented several aspects concerning the experimental preparation for sensors and actuators by using the factorial scheme based on independent and dependent variables and principal component analysis. The leading technologies envisaged are the classical ones (padding, coating, and printing) and advanced technologies such as RF plasma, microwave, and 3D printing. PCA is a statistical procedure well known by researchers and is based on orthogonal transformation of the variables possible correlated into a set of variable linearly uncorrelated (PC). The resulting vectors are a linear combination of the variables and contain x observation and represent an uncorrelated orthogonal set. Besides, in this paper are presented several technological flows for obtaining conductive or semiconductive 3D composite materials by using the standard and advanced technologies above mentioned
本文介绍了利用基于自变量、因变量和主成分分析的析因方案进行传感器和执行器实验准备的几个方面。设想的领先技术是经典技术(填充、涂层和打印)和先进技术,如射频等离子体、微波和3D打印。主成分分析是研究人员所熟知的一种统计方法,它是将可能相关的变量正交变换成一组线性不相关的变量。结果向量是变量的线性组合,包含x观测值,并表示不相关的正交集。此外,本文还介绍了利用上述标准技术和先进技术制备导电或半导体三维复合材料的几种工艺流程
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引用次数: 0
DECORATING FURTHER:APPLYING COSMETICFINISHESTOTHE HAUTE COUTURE 进一步装饰:给高级时装涂上化妆品
Pub Date : 2019-11-05 DOI: 10.35530/tt.2019.50
Anika Sitara, M. Abbas, F. Anwar
Research and experimentation becomes salient element for the rising of any country’s economic development. Designers are consolidating natural and synthetic materials to enhance thetextile surfaces and making something contemporary out-of-the-box. In this high-tech stage of era, functional finishes are becoming part of the textile and fashion world. In this research two decorative functional finishes such as Fluorescent and Phosphorescent (Glow in the Dark) are employed onto cotton substrates to develop haute couture dresses. The main purpose ofthese finishes is to enhance the aesthetics of the garments rather than decorate them with typicalprinting materials and techniques. Functional finishes have already been used in past for technical aspects but in limitations.These two major finishes will be utilized with self created print designs on classic theme “Memphisstyle” .Cut lines are also represent modern era garments for spring season.
研究和实验成为任何一个国家经济发展崛起的重要因素。设计师们正在整合天然和合成材料,以增强纺织品的表面,并创造出一些开箱即用的当代风格。在这个高科技时代,功能性整理正在成为纺织品和时尚界的一部分。在这项研究中,两种装饰性的功能饰面,如荧光和磷光(在黑暗中发光)被应用于棉基板上,以开发高级时装。这些整理的主要目的是提高服装的美学,而不是用典型的印刷材料和技术来装饰它们。功能性饰面在过去已经用于技术方面,但有局限性。这两种主要的饰面将与经典主题“孟菲斯风格”的自我创作的印花设计相结合,剪裁线条也代表了春季的现代服装。
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引用次数: 0
TREATMENT OF TEXTILEWASTEWATER USING MICROBES’ INOCULATED FREE-FLOATINGAQUATICPLANTSBASEDWETLANDS 微生物接种自由漂浮水生植物湿地处理纺织废水
Pub Date : 2019-11-05 DOI: 10.35530/tt.2019.26
Muhammad Qamar Tusief, M. Malik, Muhammad Mohsin, H. Asghar
Textile wastewater is a big source of aquatic and environmental pollution.Currently, various physicochemical textile effluent treatments are practiced in the textile industry, but they have challenges with respect to cost, maintenance, labour management, chemicals usage and production of additional sludge. The present study was carried out to develop a less expensive, chemical-free, green and sustainable plant based floating treatment wetlands (FTWs) system augmented with bacteria to remedy the effluents from textile finishing unit. Two free-floating aquatic plants, Eichhornia crassipes and Pistia stratiotes, were vegetated to develop FTWs system and its efficacy was studied with and without inoculating two plant growth-promoting and pollutant- degrading bacteria, Bacillus cereus and Bacillus subtilis. The worth of this system was analyzed by screening physicochemical parameters like potential hydrogen (pH), electric conductivity (EC), total dissolved solids (TDS), total suspended solids (TSS), biological oxygen demand (BOD) and chemical oxygen demand (COD) of wastewater for hydraulic retention periods of 0, 24, 48 and 72 hours. The pH of the treated wastewaters was changed from acidic to neutral/alkaline side while a significant reduction was found in all other physiochemical parameters as per set limits of industrial and municipal wastewater standards as specified by the National Environmental Quality Standards (NEQS) of Pak istan and Zero Discharge of Hazardous Chemicals (ZDHC) program.
纺织废水是水体污染和环境污染的重要来源。目前,纺织工业采用了多种物化法处理纺织废水,但在成本、维护、劳动力管理、化学品使用和产生额外污泥等方面存在挑战。本研究旨在开发一种成本更低、无化学物质、绿色和可持续的植物漂浮处理湿地(fts)系统,以修复纺织后整理装置的废水。以两种自由漂浮的水生植物石竹(Eichhornia crassipes)和大薸(Pistia stratiotes)为研究材料,分别接种蜡样芽孢杆菌(Bacillus cereus)和枯草芽孢杆菌(Bacillus subtilis)两种促进植物生长和降解污染物的细菌,并对其效果进行了研究。通过筛选水力滞留0、24、48和72小时废水的电位氢(pH)、电导率(EC)、总溶解固形物(TDS)、总悬浮固形物(TSS)、生物需氧量(BOD)和化学需氧量(COD)等理化参数,分析了该系统的价值。处理后废水的pH值由酸性变为中性/碱性,而所有其他理化参数均显著降低,符合巴基斯坦国家环境质量标准(NEQS)和危险化学品零排放(ZDHC)计划规定的工业和城市废水标准的设定限值。
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引用次数: 0
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