Tissue engineering is nowadays an emerging approach that aims to replace or regenerate diseased or damaged organs with engineered constructs. Considering the key role of growth factors (GFs) in the tissue regeneration...Tissue engineering is nowadays an emerging approach that aims to replace or regenerate diseased or damaged organs with engineered constructs. Considering the key role of growth factors (GFs) in the tissue regeneration process, these biomolecules are considered an important part of the tissue engineering process, so the presence of growth factors in engineered scaffolds can accelerate tissue regeneration by influencing the behavior of cells. Platelet-rich plasma (PRP), as an autologous source of a variety of growth factors, is considered a therapeutic agent for the treatment of degenerative diseases. Regarding its ability to promote the healing process and tissue regeneration, PRP therapy has attracted great attention in bone and cartilage tissue engineering. Incorporating PRP and its derivatives into engineered scaffolds not only bioactivates the scaffold, but the scaffold matrix also acts as a sustained and localized growth factor release system. In addition, the presence of a scaffold can promote the bioactivity of GFs by providing an environment that facilitates their interaction, leading to enhanced effects compared to their free form. This review presents a brief overview of PRP's role in bone and cartilage tissue regeneration with the main focus on scaffold-mediated PRP delivery. In addition, the classification of platelet-rich products, current extraction techniques, terminology, and scaffold bioactivation methods are presented to provide a better understanding of the basics and the key aspects that may affect the effectiveness of therapy in bone and cartilage tissue engineering.展开更多
In this study, jute woven fabrics (1 × 1 plain, twill, zigzag and diamond weave) were manufactured from 100% raw jute yarn. The fabric specimens were treated by 5%, 10%, 15%, 20% and 25% unsaturated polyester res...In this study, jute woven fabrics (1 × 1 plain, twill, zigzag and diamond weave) were manufactured from 100% raw jute yarn. The fabric specimens were treated by 5%, 10%, 15%, 20% and 25% unsaturated polyester resin where styrene monomer used as a solvent and 1% methyl ethyl ketone peroxide (MEKP) was used as initiator. Two bar pressure was applied for complete wetting of the fabric by a Padder and curing was done at 130?C for 10 minutes. The physico-mechanical characteristics of untreated and treated samples were examined and evaluated. It was revealed that moisture content (MC) and water absorbency of the treated specimens were decreased with the increase of resin percentage (%) in the fabrics. MC and water absorbency were maximum decreased up to 50.23% and 60.14% respectively by 25% resin treatment. On the other hand, bending length (BL), flexural rigidity (FR), flexural modulus (FM) and tensile strength (TS) were enhanced with the increase of resin percentage in the fabrics which resulted higher fabric stiffness. The maximum improvement of BL, FR, FM and TS were found to be 6.67%, 56.04%, 10.57% and 18.75% respectively in comparison to untreated sample. Soil degradation tests exhibited that 33.59% TS loss occurred for untreated specimens where only 8.04% loss of TS found for 25% resin treated one. Furthermore, jute based twill, zigzag and diamond fabrics were also treated by 10%, 15%, 20% and 25% resin, then measured their TS and compared with plain fabrics. It was revealed that plain fabrics have superior TS over other fabrics. It was also evident that TS enhanced for all the fabrics after resin treatment and maximum increase found for all the fabrics up to 25% resin treatment.展开更多
Denim was produced in the city of Nîmes in France and was originally called the serge de Nîmes.The word denim is an English colloquialism of the French term:"denim."Day by day Bangladesh denim sect...Denim was produced in the city of Nîmes in France and was originally called the serge de Nîmes.The word denim is an English colloquialism of the French term:"denim."Day by day Bangladesh denim sector very much developed and helps to increase productivity.Bangladesh have seen a significant increase in investing in denim fabric manufacturing,increasing the country’s production performance by reducing fabric dependence on imports.It is important due to its aspects of durability,and not easily torn which benefited physical laborers much.The government also plays a vital role in denim textile industry.This paper shows different section of denim textile industry such as:sewing section,cutting section,washing,IE and finishing department.The main aim of this paper is how to role all the section of denim textile industry.Textile education is insufficient without industry attachment,which bridges the gap between theoretical and practical aspects and acclimates students to the industrial world.We can gain about theoretical development on an industrial level from this attachment.We can understand more about the machines used in various departments,their technical specifications,characteristics,operating system,and so on,and we believe that without this type of industrial connection,it is impossible to obtain industry-based information about textile engineering adequately.The Industrial Attachment on Denim Manufacturing Technology was used to organize this study(sewing section,cutting,IE,washing section,CAD Section,and finishing department.Various operating procedures for the production of denim in the industry are presented in this paper.The technique and process of several procedures and processes are presented here such as machine specifications,manpower,maintenance,layout of the different section,dye processes and wet processes.展开更多
Ultra violet radiation is detrimental to human skin and responsible for various skin diseases that is now worldwide growing concern for the people. Sun screen lotions, however, considered best possible solution but it...Ultra violet radiation is detrimental to human skin and responsible for various skin diseases that is now worldwide growing concern for the people. Sun screen lotions, however, considered best possible solution but its temporary attachment didn’t bring the real impact. The advancement of nano technology provides a number of techniques to introduce UV protected fabric by applying certain semi conductor metal oxide. So many researches have been carried out to coat the fabric using certain nano particles namely ZnO and TiO2 to improve the UV absorption capacity of material as well as increasing UPF value to protect the human skin which have been playing a significant role to provide UV protected clothing. This paper deals with the harmful impact of ultra violet radiation on human skin, UPF measurement method and UV protective finishing on textile material using nano ZnO and nano TiO2 particle.展开更多
The objective of this research was to investigate the optimum condition for treatment of textile industrial wastewater from water jet loom machine by chemical coagulation and electrocoagulation methods. The variables ...The objective of this research was to investigate the optimum condition for treatment of textile industrial wastewater from water jet loom machine by chemical coagulation and electrocoagulation methods. The variables of chemical coagulation method were type and amount of chemicals, pH and stirring rate. For electrocoagulation method, the variables were electrode materials, electric potential and contact time. It was found that the optimum condition of chemical coagulation method was 10% （w/w） of aqueous solution of aluminum sulphate 80 mL and 0.01% （w/w） of aqueous solution of coagulant aids, cationic polymer 32 mL per 4 L of wastewater at oH 8. The mixture solution was rapidly stirred with 120 rpm for 1 min and then slowly stirred with 20 rpm for 20 rain. The removal efficiency of turbidity, COD and oil content were 88.88%, 85.20% and 77.72%, respectively. For electrocoagulation method, the optimum condition was using aluminum electrode with 35 V and 150 min of contact time. The removal efficiency of turbidity, COD and oil content were 98.86%, 91.63% and 89.84%, respectively. It can be concluded from this study that the textile industrial wastewater treatment from water jet loom machine with electrocoagulation method is more efficient than that with chemical coagulation method.展开更多
The ecological and sustainable product is the demand of the present world. But it was not possible to produce an ecological and sustainable product for all sectors as the world requires now. The synthetic material is ...The ecological and sustainable product is the demand of the present world. But it was not possible to produce an ecological and sustainable product for all sectors as the world requires now. The synthetic material is used to produce flame retardant materials due to the unavailable sustainable ecological flame-retardant material. But different researchers are trying to produce sustainable ecological flame-retardant material. This research found that the Spinach leaves Juice, banana pseudostem sap (SAP) and eggshell powder have flame retardant properties. Different literature shows that the ash also has flame retardant properties. So researcher suggested developing the composite material from the above materials with cotton fibres. It may be more effective as fire-retardant composite materials.展开更多
This experiment is generally based on the three types of engineering stripe fabrics named single jersey, full feeder lycra single jersey, and single lacoste fabric. In Bangladesh, conventional practices of engineering...This experiment is generally based on the three types of engineering stripe fabrics named single jersey, full feeder lycra single jersey, and single lacoste fabric. In Bangladesh, conventional practices of engineering stripe fabric hardly seen. As the textile engineer, we focused to identify the basic difference between these fabrics. We kept the repeat length constant for all three fabrics. In these circumstances, how stitch length, yarn count, gsm, fabric dia, machine settings, machine maintenance, machine rpm varies into those three mentioned fabrics. It is the main motto of these experiments to make them more favourable into the trendy fashion world.展开更多
In this paper polyester fabrics were pretreated with alkaline solution to improve the ability for the fabric surface to bond with polypyrrole(PPy)coating layer.In situ chemical oxidative polymerization of pyrrole mono...In this paper polyester fabrics were pretreated with alkaline solution to improve the ability for the fabric surface to bond with polypyrrole(PPy)coating layer.In situ chemical oxidative polymerization of pyrrole monomer was performed on alkali treated polyester fabrics.Then the fabrics were characterized by FTIR and XRD analysis.The tensile properties of the yarns in both warp and weft directions were measured after alkali treatment and PPy coating processes.The abrasion resistance test was performed on PPy coated fabrics with and without alkali treatment.The surface electrical resistivity of PPy coated fabrics were searched.The electromagnetic shielding effectiveness(EMSE)properties of fabrics in terms of reflection,absorption and transmission behaviors were also investigated.A significant EMSE value increase(about 27%)was obtained with alkali treatment.展开更多
This research work was intended to analyze the unleashed issues related to apparel trade during COVID-19 pandemic&made an attempt to find the best possible responses to uphold marketing campaigns during&after ...This research work was intended to analyze the unleashed issues related to apparel trade during COVID-19 pandemic&made an attempt to find the best possible responses to uphold marketing campaigns during&after the pandemic situation.Apparel industries in Asia,the largest global hub of both the textile&apparel import-export trade have been severally damaged by the COVID-19.Over the last one year,the global community had already realized the fact that how pandemic situation disrupted the supply chain management of textile,apparel&fashion manufacturing industries throughout the world.Bangladesh,one of the top ranked garments exporter countries have been facing the burning bridges,due to the scarcity of raw materials&gradual cancellation export orders.The contribution of the apparel industry is more significant for the socio-economic growth of a 3rd world countries like Bangladesh,just because apparel contributes almost 84%of its total export income with the involvement of 4.5 million people approximately.The following research paper conveys a three-fold story.In the very beginning portion,there are some reviews&analysis of the overall scenarios of the COVID-19 pandemic with presence of several business reports,academic journals,market research,manufacture's opinions&stakeholders'strategies.The second phase of the research work forecasts the possible responses need to be projected during&after the pandemic situation.Finally,this study predicts an ideal footprint to cope up with similar sort of situations in the future.展开更多
The aim of this work was to investigate the electrical resistance change of electro-textiles manufactured using cotton fabrics with stainless steel and silver plated PA yarns incorporation after being subjected to hom...The aim of this work was to investigate the electrical resistance change of electro-textiles manufactured using cotton fabrics with stainless steel and silver plated PA yarns incorporation after being subjected to home laundering, i.e. detergent washing and silicone softening. Electrical resistances of conductive yams inside the fabric structure were compared and discussed statistically before and after washing and softener application. Greatest changes in electrical resistances were observed with samples including silver plated PA yams. After five washing cycles with detergent, silicone softening agent is removed from yarns by washing, and thus conductivity increases. Further washing of e-textiles with detergent for five more cycles causes decrease in conductivity, because of chemical effects of detergent and mechanical effects of washing process such as abrasion due to friction. Detergent which has negative reactive sites bonds with metal ions reduces conductivity.展开更多
Electrospinning has gained significant importance across various fields,including biomedicine,filtration,and packaging due to the control it provides over the properties of the resulting materials,such as fiber diamet...Electrospinning has gained significant importance across various fields,including biomedicine,filtration,and packaging due to the control it provides over the properties of the resulting materials,such as fiber diameter and membrane thickness.Chitosan is a biopolymer that can be utilized with both natural and synthetic copolymers,owing to its therapeutic potential,biocompatibility,and biodegradability.However,producing electrospun chitosan is challenging due to its high solution viscosity,which often results in the formation of beads instead of uniform fibers.To address this issue,the spinnability of chitosan is significantly enhanced,and the production of continuous nanofibers is facilitated by combining it with polymers such as polyethylene oxide(PEO)in suitable ratios.These chitosan–PEO nanofibers are primarily used in biomedical applications,including wound healing,drug delivery systems,and tissue engineering scaffolds.Additionally,they have shown promise in water treatment,filtration membranes,and packaging.Among all the nanofiber mats,chitosan/PEO-AC had the smallest fiber diameter(83±12.5 nm),chitosan/PEO_45S5 had the highest tensile strength(1611±678 MPa).This comprehensive review highlights recent advancements,ongoing challenges,and future directions in the electrospinning of chitosan-based fibers assisted by PEO.展开更多
Global warming is making plants more susceptible to heat stress.Hence,adjustments to crop production systems are required for global food security.Heat stress(HS)poses a threat to the quality of ecosystems and global ...Global warming is making plants more susceptible to heat stress.Hence,adjustments to crop production systems are required for global food security.Heat stress(HS)poses a threat to the quality of ecosystems and global food security due to its adverse effects on plant development.The degree to which HS affects physiological disruptions,physical harm,and biochemical changes at various growth stages directly correlates with its effects on physiological functions,plant growth,and crop production.One promising approach is soil modification using biochar,which enhances soil health and promotes the development of microbial communities,ultimately improving plant heat tolerance.Biochar enhances soil structure,improves moisture retention,and increases nutrient availability in hot weather,thereby promoting plant growth and enhancing crop yields.Additionally,biochar,with its porous structure and ability to provide a liming effect,increases the diversity and activity of soil microbes,thereby fostering advantageous symbiotic relationships.These microbial communities support nutrient cycling,root growth,and general soil health,strengthening biochar’s position as a long-term solution for climate-resilient farming.Earlier research concentrated on the connection between biochar and heat stress or microbial populations;however,this review uniquely combines all three elements,providing a fresh viewpoint on their interrelated functions in enhancing plant adaptability.Furthermore,this study demonstrates the potential of biochar as a sustainable component for improving soil and supporting crops that adapt to heat stress.It examines the processes underlying these interactions and provides recommendations for future research strategies.展开更多
The increasing demand for high-capacity energy storage,spurred by the growth of renewable energy,has accelerated the pursuit of cost-effective and sustainable aqueous zinc-ion batteries as a viable alternative to trad...The increasing demand for high-capacity energy storage,spurred by the growth of renewable energy,has accelerated the pursuit of cost-effective and sustainable aqueous zinc-ion batteries as a viable alternative to traditional lithium-ion batteries.In this study,a cation-anion coordination cathode material(Zn-MnO_(2)F_(X))is proposed,which regulates the central valence state of Mn ions by covalently anchoring manganese oxides with Zn ions and F ions to inhibit Jahn-Teller distortion and manganese dissolution.展开更多
This paper reports the effects of fiber breakage defects and waviness defects on the compressive fatigue behavior and the progressive damage evolution process of 3D Multiaxial Braided Composites (3DMBCs). Combined wit...This paper reports the effects of fiber breakage defects and waviness defects on the compressive fatigue behavior and the progressive damage evolution process of 3D Multiaxial Braided Composites (3DMBCs). Combined with finite element compression simulation and ultra-depth microscope, the internal defect content of composites with different braiding angles was determined. The results demonstrate that the weakening effect of waviness and fiber breakage defects is greater than the strengthening effect of the braiding angle. This causes the fatigue resistance of 3DMBCs with the 31° braiding angle being better in both directions of 0° and 90°. The increase of 4° waviness and 10% fiber breakage defect results in the average fatigue life of composites being shortened by 48% and the energy consumption rate increased by 10% at 85% stress level in 90° compression direction. The alteration in loading direction modifies the included angle corresponding to the stress component. The stress component parallel to the fiber direction under compressive fatigue load leads to interfacial debonding in the composites, whereas the stress component perpendicular to the fiber direction results in pronounced shear failure.展开更多
Wearable electronic textiles(e-textiles)with embedded electronics offer promising solutions for unobtrusive,real-time health monitoring,enhancing healthcare efficiency.However,their adoption is limited by performance ...Wearable electronic textiles(e-textiles)with embedded electronics offer promising solutions for unobtrusive,real-time health monitoring,enhancing healthcare efficiency.However,their adoption is limited by performance and sustainability challenges in materials,manufacturing,and recycling.This study introduces a sustainable paradigm for the fabrication of fully inkjet-printed Smart,Wearable,and Eco-friendly Electronic Textiles(SWEET)with the first comprehensive assessments of the biodegradability and life cycle assessment(LCA).SWEET addresses existing limitations,enabling concurrent and continuous monitoring of human physiology,including skin surface temperature(at temperature coefficient of resistance,TCR value of~-4.4%℃^(-1))and heart rate(-74 beats per minute,bpm)separately and simultaneously like the industry gold standard,using consistent,versatile,and highly efficient inkjet-printed graphene and Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)-based wearable e-textiles.Demonstrations with a wearable garment on five human participants confirm the system’s capability to monitor their electrocardiogram(ECG)signals and skin temperature.Such sustainable and biodegradable e-textiles decompose by-48%in weight and lost-98%strength over 4months.Life cycle assessment(LCA)reveals that the graphene-based electrode has the lowest climate change impact of-0.037 kg CO_(2) eq,40 times lower than reference electrodes.This approach addresses material and manufacturing challenges,while aligning with environmental responsibility,marking a significant leap forward in sustainable e-textile technology for personalized healthcare management.展开更多
Natural gases obtained from different regions in the world as Scholen-Germany, Saudi Arabia and Iran were purified with a package code and the obtained results were compared in this study. For purification process, bo...Natural gases obtained from different regions in the world as Scholen-Germany, Saudi Arabia and Iran were purified with a package code and the obtained results were compared in this study. For purification process, both natural gases flowing in a vertical pipe and monoethanolamine （MEA） flowing as a film from the internal surface of a pipe were examined together. Both fluids were flown in a vertical and laminar regime. Binary diffusion coefficients, Schmidt numbers （Sc） and dynamical viscosities were calculated individually for three types of natural gases. It is demonstrated that the chemical absorption method by MEA process is the most appropriate method at high DamkOhler （Da） numbers particularly for natural gases containing high concentrations of CO2 and H2S.展开更多
The classical crystallization theories proposed by Avrami, Evans, and Mandelkern wereextended to the nonisothermal situation. The expressions derived from the classical equations canbe expressed in either the differen...The classical crystallization theories proposed by Avrami, Evans, and Mandelkern wereextended to the nonisothermal situation. The expressions derived from the classical equations canbe expressed in either the differential form or the integral form. A method was provided so as toobtain the parameters characterizing the crystallization rate and mechanism from DSC curves withseveral constant heating or cooling rates. The rate constants of crystallization obtained from bothisothermal and nonisothermal curves of poly(ethylene terephthalate)were compared.展开更多
In this study, the method of lines (MOLs) with higher order central difference approximation method coupled with the classical fourth order Runge-Kutta (RK(4,4)) method is used in solving shallow water equations (SWEs...In this study, the method of lines (MOLs) with higher order central difference approximation method coupled with the classical fourth order Runge-Kutta (RK(4,4)) method is used in solving shallow water equations (SWEs) in Cartesian coordinates to foresee water levels associated with a storm accurately along the coast of Bangladesh. In doing so, the partial derivatives of the SWEs with respect to the space variables were discretized with 5-point central difference, as a test case, to obtain a system of ordinary differential equations with time as an independent variable for every spatial grid point, which with initial conditions were solved by the RK(4,4) method. The complex land-sea interface and bottom topographic details were incorporated closely using nested schemes. The coastal and island boundaries were rectangularized through proper stair step representation, and the storing positions of the scalar and momentum variables were specified according to the rules of structured C-grid. A stable tidal regime was made over the model domain considering the effect of the major tidal constituent, M2 along the southern open boundary of the outermost parent scheme. The Meghna River fresh water discharge was taken into account for the inner most child scheme. To take into account the dynamic interaction of tide and surge, the generated tidal regime was introduced as the initial state of the sea, and the surge was then made to come over it through computer simulation. Numerical experiments were performed with the cyclone April 1991 to simulate water levels due to tide, surge, and their interaction at different stations along the coast of Bangladesh. Our computed results were found to compare reasonable well with the limited observed data obtained from Bangladesh Inland Water Transport Authority (BIWTA) and were found to be better in comparison with the results obtained through the regular finite difference method and the 3-point central difference MOLs coupled with the RK(4,4) method with regard to the root mean square error values.展开更多
In this study, multiwalled carbon nanotubes （MWCNTs） were used to encapsulate a model anticancer drug, doxorubicin （Dox）. Then, the drug-loaded MWCNTs （Dox/MWCNTs） with an optimized drug encapsulation percentage...In this study, multiwalled carbon nanotubes （MWCNTs） were used to encapsulate a model anticancer drug, doxorubicin （Dox）. Then, the drug-loaded MWCNTs （Dox/MWCNTs） with an optimized drug encapsulation percentage were mixed with poly（lactide-co-glycolide） （PLGA） polymer solution for subsequent electrospinning to form drug-loaded composite nanofibrous mats. The structure, morphology, and mechanical properties of the formed electrospun Dox/PLGA, MWCNTs/PLGA, and Dox/MWCNTs/PLGA composite nanofibrous mats were characterized using scanning electron microscopy （SEM）, Fourier transform infrared spectroscopy, and tensile testing. In vitro viability assay and SEM morphology observation of mouse fibroblast cells cultured onto the MWCNTs/PLGA fibrous scaffolds demonstrate that the developed MWCNTs/PLGA composite nanofibers are cytocompatible. The incorporation of Dox-loaded MWCNTs within the PLGA nanofibers is able to improve the mechanical durability and maintain the three-dimensional structure of the nanofibrous mats. More importantly, our results indicate that this double-container drug delivery system （both PLGA polymer and MWCNTs are drug carriers） is beneficial to avoid the burst release of the drug and able to release the antitumor drug Dox in a sustained manner for 42 days. The developed composite electrospun nanofibrous drug delivery system may be used as therapeutic scaffold materials for post-operative local chemotherapy.展开更多
A new type ofnanofibrous structure from chitosan bearing carboxymethyl-β-cyclodextrin （CS-g-β-CD） as a novel drug delivery system was synthesized by grafting carboxymethyl-β-cyclodextrin （CM β-CD） onto chitos...A new type ofnanofibrous structure from chitosan bearing carboxymethyl-β-cyclodextrin （CS-g-β-CD） as a novel drug delivery system was synthesized by grafting carboxymethyl-β-cyclodextrin （CM β-CD） onto chitosan （CS） in the presence of water soluble 1-ethyl-3-（3-dimethylaminopropyl） carbodiimide （EDC） as the condensing agent and N-hydroxysuccinimide （NHS）. Defect free mats containing CS-g-β-CD have been fabricated using electrospirming of an aqueous solution of poly（vinyl alcohol） （PVA）/CS-g-β-CD blends. The morphology and diameter of the electrospun nanofibers were examined by scanning electron microscopy （SEM）. The average fiber diameter was in the range of 130-210 run. SEM images showed that the morphology and diameter of the nanofibers were mainly affected by weight ratio of the blend at constant applied voltage. The results revealed that increasing CS-g-β-CD content in the blends decreases the average fiber diameter. It was observed that the PVA/CS-g-β-CD nanofibrous mat provided a slower release of the entrapped drug in compare to PVA/CS nanofibrous mat.展开更多
基金support from Iran’s National Elites Foundation(INEF).
文摘Tissue engineering is nowadays an emerging approach that aims to replace or regenerate diseased or damaged organs with engineered constructs. Considering the key role of growth factors (GFs) in the tissue regeneration process, these biomolecules are considered an important part of the tissue engineering process, so the presence of growth factors in engineered scaffolds can accelerate tissue regeneration by influencing the behavior of cells. Platelet-rich plasma (PRP), as an autologous source of a variety of growth factors, is considered a therapeutic agent for the treatment of degenerative diseases. Regarding its ability to promote the healing process and tissue regeneration, PRP therapy has attracted great attention in bone and cartilage tissue engineering. Incorporating PRP and its derivatives into engineered scaffolds not only bioactivates the scaffold, but the scaffold matrix also acts as a sustained and localized growth factor release system. In addition, the presence of a scaffold can promote the bioactivity of GFs by providing an environment that facilitates their interaction, leading to enhanced effects compared to their free form. This review presents a brief overview of PRP's role in bone and cartilage tissue regeneration with the main focus on scaffold-mediated PRP delivery. In addition, the classification of platelet-rich products, current extraction techniques, terminology, and scaffold bioactivation methods are presented to provide a better understanding of the basics and the key aspects that may affect the effectiveness of therapy in bone and cartilage tissue engineering.
文摘In this study, jute woven fabrics (1 × 1 plain, twill, zigzag and diamond weave) were manufactured from 100% raw jute yarn. The fabric specimens were treated by 5%, 10%, 15%, 20% and 25% unsaturated polyester resin where styrene monomer used as a solvent and 1% methyl ethyl ketone peroxide (MEKP) was used as initiator. Two bar pressure was applied for complete wetting of the fabric by a Padder and curing was done at 130?C for 10 minutes. The physico-mechanical characteristics of untreated and treated samples were examined and evaluated. It was revealed that moisture content (MC) and water absorbency of the treated specimens were decreased with the increase of resin percentage (%) in the fabrics. MC and water absorbency were maximum decreased up to 50.23% and 60.14% respectively by 25% resin treatment. On the other hand, bending length (BL), flexural rigidity (FR), flexural modulus (FM) and tensile strength (TS) were enhanced with the increase of resin percentage in the fabrics which resulted higher fabric stiffness. The maximum improvement of BL, FR, FM and TS were found to be 6.67%, 56.04%, 10.57% and 18.75% respectively in comparison to untreated sample. Soil degradation tests exhibited that 33.59% TS loss occurred for untreated specimens where only 8.04% loss of TS found for 25% resin treated one. Furthermore, jute based twill, zigzag and diamond fabrics were also treated by 10%, 15%, 20% and 25% resin, then measured their TS and compared with plain fabrics. It was revealed that plain fabrics have superior TS over other fabrics. It was also evident that TS enhanced for all the fabrics after resin treatment and maximum increase found for all the fabrics up to 25% resin treatment.
文摘Denim was produced in the city of Nîmes in France and was originally called the serge de Nîmes.The word denim is an English colloquialism of the French term:"denim."Day by day Bangladesh denim sector very much developed and helps to increase productivity.Bangladesh have seen a significant increase in investing in denim fabric manufacturing,increasing the country’s production performance by reducing fabric dependence on imports.It is important due to its aspects of durability,and not easily torn which benefited physical laborers much.The government also plays a vital role in denim textile industry.This paper shows different section of denim textile industry such as:sewing section,cutting section,washing,IE and finishing department.The main aim of this paper is how to role all the section of denim textile industry.Textile education is insufficient without industry attachment,which bridges the gap between theoretical and practical aspects and acclimates students to the industrial world.We can gain about theoretical development on an industrial level from this attachment.We can understand more about the machines used in various departments,their technical specifications,characteristics,operating system,and so on,and we believe that without this type of industrial connection,it is impossible to obtain industry-based information about textile engineering adequately.The Industrial Attachment on Denim Manufacturing Technology was used to organize this study(sewing section,cutting,IE,washing section,CAD Section,and finishing department.Various operating procedures for the production of denim in the industry are presented in this paper.The technique and process of several procedures and processes are presented here such as machine specifications,manpower,maintenance,layout of the different section,dye processes and wet processes.
文摘Ultra violet radiation is detrimental to human skin and responsible for various skin diseases that is now worldwide growing concern for the people. Sun screen lotions, however, considered best possible solution but its temporary attachment didn’t bring the real impact. The advancement of nano technology provides a number of techniques to introduce UV protected fabric by applying certain semi conductor metal oxide. So many researches have been carried out to coat the fabric using certain nano particles namely ZnO and TiO2 to improve the UV absorption capacity of material as well as increasing UPF value to protect the human skin which have been playing a significant role to provide UV protected clothing. This paper deals with the harmful impact of ultra violet radiation on human skin, UPF measurement method and UV protective finishing on textile material using nano ZnO and nano TiO2 particle.
文摘The objective of this research was to investigate the optimum condition for treatment of textile industrial wastewater from water jet loom machine by chemical coagulation and electrocoagulation methods. The variables of chemical coagulation method were type and amount of chemicals, pH and stirring rate. For electrocoagulation method, the variables were electrode materials, electric potential and contact time. It was found that the optimum condition of chemical coagulation method was 10% （w/w） of aqueous solution of aluminum sulphate 80 mL and 0.01% （w/w） of aqueous solution of coagulant aids, cationic polymer 32 mL per 4 L of wastewater at oH 8. The mixture solution was rapidly stirred with 120 rpm for 1 min and then slowly stirred with 20 rpm for 20 rain. The removal efficiency of turbidity, COD and oil content were 88.88%, 85.20% and 77.72%, respectively. For electrocoagulation method, the optimum condition was using aluminum electrode with 35 V and 150 min of contact time. The removal efficiency of turbidity, COD and oil content were 98.86%, 91.63% and 89.84%, respectively. It can be concluded from this study that the textile industrial wastewater treatment from water jet loom machine with electrocoagulation method is more efficient than that with chemical coagulation method.
文摘The ecological and sustainable product is the demand of the present world. But it was not possible to produce an ecological and sustainable product for all sectors as the world requires now. The synthetic material is used to produce flame retardant materials due to the unavailable sustainable ecological flame-retardant material. But different researchers are trying to produce sustainable ecological flame-retardant material. This research found that the Spinach leaves Juice, banana pseudostem sap (SAP) and eggshell powder have flame retardant properties. Different literature shows that the ash also has flame retardant properties. So researcher suggested developing the composite material from the above materials with cotton fibres. It may be more effective as fire-retardant composite materials.
文摘This experiment is generally based on the three types of engineering stripe fabrics named single jersey, full feeder lycra single jersey, and single lacoste fabric. In Bangladesh, conventional practices of engineering stripe fabric hardly seen. As the textile engineer, we focused to identify the basic difference between these fabrics. We kept the repeat length constant for all three fabrics. In these circumstances, how stitch length, yarn count, gsm, fabric dia, machine settings, machine maintenance, machine rpm varies into those three mentioned fabrics. It is the main motto of these experiments to make them more favourable into the trendy fashion world.
基金This research received no specific grant from any funding agency in the public,commercial,or not-for-profit sectors.
文摘In this paper polyester fabrics were pretreated with alkaline solution to improve the ability for the fabric surface to bond with polypyrrole(PPy)coating layer.In situ chemical oxidative polymerization of pyrrole monomer was performed on alkali treated polyester fabrics.Then the fabrics were characterized by FTIR and XRD analysis.The tensile properties of the yarns in both warp and weft directions were measured after alkali treatment and PPy coating processes.The abrasion resistance test was performed on PPy coated fabrics with and without alkali treatment.The surface electrical resistivity of PPy coated fabrics were searched.The electromagnetic shielding effectiveness(EMSE)properties of fabrics in terms of reflection,absorption and transmission behaviors were also investigated.A significant EMSE value increase(about 27%)was obtained with alkali treatment.
文摘This research work was intended to analyze the unleashed issues related to apparel trade during COVID-19 pandemic&made an attempt to find the best possible responses to uphold marketing campaigns during&after the pandemic situation.Apparel industries in Asia,the largest global hub of both the textile&apparel import-export trade have been severally damaged by the COVID-19.Over the last one year,the global community had already realized the fact that how pandemic situation disrupted the supply chain management of textile,apparel&fashion manufacturing industries throughout the world.Bangladesh,one of the top ranked garments exporter countries have been facing the burning bridges,due to the scarcity of raw materials&gradual cancellation export orders.The contribution of the apparel industry is more significant for the socio-economic growth of a 3rd world countries like Bangladesh,just because apparel contributes almost 84%of its total export income with the involvement of 4.5 million people approximately.The following research paper conveys a three-fold story.In the very beginning portion,there are some reviews&analysis of the overall scenarios of the COVID-19 pandemic with presence of several business reports,academic journals,market research,manufacture's opinions&stakeholders'strategies.The second phase of the research work forecasts the possible responses need to be projected during&after the pandemic situation.Finally,this study predicts an ideal footprint to cope up with similar sort of situations in the future.
文摘The aim of this work was to investigate the electrical resistance change of electro-textiles manufactured using cotton fabrics with stainless steel and silver plated PA yarns incorporation after being subjected to home laundering, i.e. detergent washing and silicone softening. Electrical resistances of conductive yams inside the fabric structure were compared and discussed statistically before and after washing and softener application. Greatest changes in electrical resistances were observed with samples including silver plated PA yams. After five washing cycles with detergent, silicone softening agent is removed from yarns by washing, and thus conductivity increases. Further washing of e-textiles with detergent for five more cycles causes decrease in conductivity, because of chemical effects of detergent and mechanical effects of washing process such as abrasion due to friction. Detergent which has negative reactive sites bonds with metal ions reduces conductivity.
文摘Electrospinning has gained significant importance across various fields,including biomedicine,filtration,and packaging due to the control it provides over the properties of the resulting materials,such as fiber diameter and membrane thickness.Chitosan is a biopolymer that can be utilized with both natural and synthetic copolymers,owing to its therapeutic potential,biocompatibility,and biodegradability.However,producing electrospun chitosan is challenging due to its high solution viscosity,which often results in the formation of beads instead of uniform fibers.To address this issue,the spinnability of chitosan is significantly enhanced,and the production of continuous nanofibers is facilitated by combining it with polymers such as polyethylene oxide(PEO)in suitable ratios.These chitosan–PEO nanofibers are primarily used in biomedical applications,including wound healing,drug delivery systems,and tissue engineering scaffolds.Additionally,they have shown promise in water treatment,filtration membranes,and packaging.Among all the nanofiber mats,chitosan/PEO-AC had the smallest fiber diameter(83±12.5 nm),chitosan/PEO_45S5 had the highest tensile strength(1611±678 MPa).This comprehensive review highlights recent advancements,ongoing challenges,and future directions in the electrospinning of chitosan-based fibers assisted by PEO.
文摘Global warming is making plants more susceptible to heat stress.Hence,adjustments to crop production systems are required for global food security.Heat stress(HS)poses a threat to the quality of ecosystems and global food security due to its adverse effects on plant development.The degree to which HS affects physiological disruptions,physical harm,and biochemical changes at various growth stages directly correlates with its effects on physiological functions,plant growth,and crop production.One promising approach is soil modification using biochar,which enhances soil health and promotes the development of microbial communities,ultimately improving plant heat tolerance.Biochar enhances soil structure,improves moisture retention,and increases nutrient availability in hot weather,thereby promoting plant growth and enhancing crop yields.Additionally,biochar,with its porous structure and ability to provide a liming effect,increases the diversity and activity of soil microbes,thereby fostering advantageous symbiotic relationships.These microbial communities support nutrient cycling,root growth,and general soil health,strengthening biochar’s position as a long-term solution for climate-resilient farming.Earlier research concentrated on the connection between biochar and heat stress or microbial populations;however,this review uniquely combines all three elements,providing a fresh viewpoint on their interrelated functions in enhancing plant adaptability.Furthermore,this study demonstrates the potential of biochar as a sustainable component for improving soil and supporting crops that adapt to heat stress.It examines the processes underlying these interactions and provides recommendations for future research strategies.
基金support from China Postdoctoral Science Foundation(2019 T120189)Analytical&Testing Center of Tiangong University for characterization of al the samplesprovided by Cangzhou Institute of Tiangong University(Grant No.TGCYY-F-0301)。
文摘The increasing demand for high-capacity energy storage,spurred by the growth of renewable energy,has accelerated the pursuit of cost-effective and sustainable aqueous zinc-ion batteries as a viable alternative to traditional lithium-ion batteries.In this study,a cation-anion coordination cathode material(Zn-MnO_(2)F_(X))is proposed,which regulates the central valence state of Mn ions by covalently anchoring manganese oxides with Zn ions and F ions to inhibit Jahn-Teller distortion and manganese dissolution.
基金supported by the National Natural Science Foundation,China(Nos.52073224,12472141 and 12002248)the Natural Science Foundation of Shaanxi Province,China(Nos.2023KXJ-034 and 2023KXJ-005)+3 种基金Xi’an Science and Technology Plan Project,China(No.2022JH-ZCZC-0004)the Young Talent Fund of University Association for Science and Technology in Shaanxi,China(No.20210509)the Scientific Research Project of Shaanxi Provincial Education Department,China(No.22JC035)Shaanxi Outstanding Youth Science Fund Project,China(No.2024JC-JCQN-03).
文摘This paper reports the effects of fiber breakage defects and waviness defects on the compressive fatigue behavior and the progressive damage evolution process of 3D Multiaxial Braided Composites (3DMBCs). Combined with finite element compression simulation and ultra-depth microscope, the internal defect content of composites with different braiding angles was determined. The results demonstrate that the weakening effect of waviness and fiber breakage defects is greater than the strengthening effect of the braiding angle. This causes the fatigue resistance of 3DMBCs with the 31° braiding angle being better in both directions of 0° and 90°. The increase of 4° waviness and 10% fiber breakage defect results in the average fatigue life of composites being shortened by 48% and the energy consumption rate increased by 10% at 85% stress level in 90° compression direction. The alteration in loading direction modifies the included angle corresponding to the stress component. The stress component parallel to the fiber direction under compressive fatigue load leads to interfacial debonding in the composites, whereas the stress component perpendicular to the fiber direction results in pronounced shear failure.
基金funding from Commonwealth Scholarship Commission(CSC)U.K.for a Ph.D.scholarship for Marzia DulalUKRI Research England the Expanding Excellence in England(E3)grant.
文摘Wearable electronic textiles(e-textiles)with embedded electronics offer promising solutions for unobtrusive,real-time health monitoring,enhancing healthcare efficiency.However,their adoption is limited by performance and sustainability challenges in materials,manufacturing,and recycling.This study introduces a sustainable paradigm for the fabrication of fully inkjet-printed Smart,Wearable,and Eco-friendly Electronic Textiles(SWEET)with the first comprehensive assessments of the biodegradability and life cycle assessment(LCA).SWEET addresses existing limitations,enabling concurrent and continuous monitoring of human physiology,including skin surface temperature(at temperature coefficient of resistance,TCR value of~-4.4%℃^(-1))and heart rate(-74 beats per minute,bpm)separately and simultaneously like the industry gold standard,using consistent,versatile,and highly efficient inkjet-printed graphene and Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)-based wearable e-textiles.Demonstrations with a wearable garment on five human participants confirm the system’s capability to monitor their electrocardiogram(ECG)signals and skin temperature.Such sustainable and biodegradable e-textiles decompose by-48%in weight and lost-98%strength over 4months.Life cycle assessment(LCA)reveals that the graphene-based electrode has the lowest climate change impact of-0.037 kg CO_(2) eq,40 times lower than reference electrodes.This approach addresses material and manufacturing challenges,while aligning with environmental responsibility,marking a significant leap forward in sustainable e-textile technology for personalized healthcare management.
文摘Natural gases obtained from different regions in the world as Scholen-Germany, Saudi Arabia and Iran were purified with a package code and the obtained results were compared in this study. For purification process, both natural gases flowing in a vertical pipe and monoethanolamine （MEA） flowing as a film from the internal surface of a pipe were examined together. Both fluids were flown in a vertical and laminar regime. Binary diffusion coefficients, Schmidt numbers （Sc） and dynamical viscosities were calculated individually for three types of natural gases. It is demonstrated that the chemical absorption method by MEA process is the most appropriate method at high DamkOhler （Da） numbers particularly for natural gases containing high concentrations of CO2 and H2S.
基金This work was supported by the Tianjin Youth Science Foundation for the 21th Century,Tianjin,China.
文摘The classical crystallization theories proposed by Avrami, Evans, and Mandelkern wereextended to the nonisothermal situation. The expressions derived from the classical equations canbe expressed in either the differential form or the integral form. A method was provided so as toobtain the parameters characterizing the crystallization rate and mechanism from DSC curves withseveral constant heating or cooling rates. The rate constants of crystallization obtained from bothisothermal and nonisothermal curves of poly(ethylene terephthalate)were compared.
文摘In this study, the method of lines (MOLs) with higher order central difference approximation method coupled with the classical fourth order Runge-Kutta (RK(4,4)) method is used in solving shallow water equations (SWEs) in Cartesian coordinates to foresee water levels associated with a storm accurately along the coast of Bangladesh. In doing so, the partial derivatives of the SWEs with respect to the space variables were discretized with 5-point central difference, as a test case, to obtain a system of ordinary differential equations with time as an independent variable for every spatial grid point, which with initial conditions were solved by the RK(4,4) method. The complex land-sea interface and bottom topographic details were incorporated closely using nested schemes. The coastal and island boundaries were rectangularized through proper stair step representation, and the storing positions of the scalar and momentum variables were specified according to the rules of structured C-grid. A stable tidal regime was made over the model domain considering the effect of the major tidal constituent, M2 along the southern open boundary of the outermost parent scheme. The Meghna River fresh water discharge was taken into account for the inner most child scheme. To take into account the dynamic interaction of tide and surge, the generated tidal regime was introduced as the initial state of the sea, and the surge was then made to come over it through computer simulation. Numerical experiments were performed with the cyclone April 1991 to simulate water levels due to tide, surge, and their interaction at different stations along the coast of Bangladesh. Our computed results were found to compare reasonable well with the limited observed data obtained from Bangladesh Inland Water Transport Authority (BIWTA) and were found to be better in comparison with the results obtained through the regular finite difference method and the 3-point central difference MOLs coupled with the RK(4,4) method with regard to the root mean square error values.
基金financially supported by the“111 Project”(No.B07024)the Fundamental Research Funds for the Central Universities(for R.Guo,M.Shen and X.Shi)+1 种基金the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learningthe Program for Innovative Research Team(in Science and Technology)in University of Henan Province(No.13IRTSTHN024)
文摘In this study, multiwalled carbon nanotubes （MWCNTs） were used to encapsulate a model anticancer drug, doxorubicin （Dox）. Then, the drug-loaded MWCNTs （Dox/MWCNTs） with an optimized drug encapsulation percentage were mixed with poly（lactide-co-glycolide） （PLGA） polymer solution for subsequent electrospinning to form drug-loaded composite nanofibrous mats. The structure, morphology, and mechanical properties of the formed electrospun Dox/PLGA, MWCNTs/PLGA, and Dox/MWCNTs/PLGA composite nanofibrous mats were characterized using scanning electron microscopy （SEM）, Fourier transform infrared spectroscopy, and tensile testing. In vitro viability assay and SEM morphology observation of mouse fibroblast cells cultured onto the MWCNTs/PLGA fibrous scaffolds demonstrate that the developed MWCNTs/PLGA composite nanofibers are cytocompatible. The incorporation of Dox-loaded MWCNTs within the PLGA nanofibers is able to improve the mechanical durability and maintain the three-dimensional structure of the nanofibrous mats. More importantly, our results indicate that this double-container drug delivery system （both PLGA polymer and MWCNTs are drug carriers） is beneficial to avoid the burst release of the drug and able to release the antitumor drug Dox in a sustained manner for 42 days. The developed composite electrospun nanofibrous drug delivery system may be used as therapeutic scaffold materials for post-operative local chemotherapy.
文摘A new type ofnanofibrous structure from chitosan bearing carboxymethyl-β-cyclodextrin （CS-g-β-CD） as a novel drug delivery system was synthesized by grafting carboxymethyl-β-cyclodextrin （CM β-CD） onto chitosan （CS） in the presence of water soluble 1-ethyl-3-（3-dimethylaminopropyl） carbodiimide （EDC） as the condensing agent and N-hydroxysuccinimide （NHS）. Defect free mats containing CS-g-β-CD have been fabricated using electrospirming of an aqueous solution of poly（vinyl alcohol） （PVA）/CS-g-β-CD blends. The morphology and diameter of the electrospun nanofibers were examined by scanning electron microscopy （SEM）. The average fiber diameter was in the range of 130-210 run. SEM images showed that the morphology and diameter of the nanofibers were mainly affected by weight ratio of the blend at constant applied voltage. The results revealed that increasing CS-g-β-CD content in the blends decreases the average fiber diameter. It was observed that the PVA/CS-g-β-CD nanofibrous mat provided a slower release of the entrapped drug in compare to PVA/CS nanofibrous mat.
