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Hi-Accuracy Method for Spectrum Shift Determination 光谱偏移的高精度测定方法
IF 3.9
Fibers Pub Date : 2023-07-10 DOI: 10.3390/fib11070060
N. Pavlycheva, Ayna Niyazgulyyewa, A. Sakhabutdinov, V. Anfinogentov, Oleg Morozov, T. Agliullin, Bulat Valeev
{"title":"Hi-Accuracy Method for Spectrum Shift Determination","authors":"N. Pavlycheva, Ayna Niyazgulyyewa, A. Sakhabutdinov, V. Anfinogentov, Oleg Morozov, T. Agliullin, Bulat Valeev","doi":"10.3390/fib11070060","DOIUrl":"https://doi.org/10.3390/fib11070060","url":null,"abstract":"A new hi-accuracy method for slight-shift determination of low-resolution spectra is proposed. The method allows determining a spectrum shift with an accuracy exceeding the spectrum analyzer resolution to more than three orders of magnitude due to the mathematical post-processing. The method is based on representing the spectrum as a continuous and everywhere differentiable function; expanding it into the Taylor series; approximating all the function derivatives by finite differences of a given order. Thereafter, the spectrum shift is determined using the least-squares method. The method description, its mathematical foundation and the simulation results are given. The advantages of the application of the proposed method are shown.","PeriodicalId":12122,"journal":{"name":"Fibers","volume":" ","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41765906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Post-Cracking Behaviour of Fibre-Reinforced Shotcrete: A Numerical Comparison between Beams and Panels 纤维喷射混凝土的开裂后性能:梁与板的数值比较
IF 3.9
Fibers Pub Date : 2023-07-04 DOI: 10.3390/fib11070059
Lina Östlund, A. Sjölander, Elin Brodd
{"title":"Post-Cracking Behaviour of Fibre-Reinforced Shotcrete: A Numerical Comparison between Beams and Panels","authors":"Lina Östlund, A. Sjölander, Elin Brodd","doi":"10.3390/fib11070059","DOIUrl":"https://doi.org/10.3390/fib11070059","url":null,"abstract":"Fibre-reinforced shotcrete is an essential part of the support of hard rock tunnels. Due to the complexity of the design, a combination of empirical and numerical analysis is commonly used in the design. The required dosage of fibres for structural purposes is determined based on minimum energy absorption or residual flexural strength. The latter is derived from tests on beams, while energy absorption is tested on panels. It is widely known that tests on beams suffer from a large scatter in results due to the short fracture zone in combination with the natural variation in the number and orientation of fibres which bridge the crack. This impacts the characteristic strength derived from these tests negatively. This paper presents a numerical study to investigate how the test method affects the required dosage of fibres. First, a non-linear model for shotcrete based on continuum damage mechanics is presented. Thereafter, the model is tuned against test results for beams and panels. A model tuned on beams is then used to simulate the response of a panel and vice versa. The results indicate that the size of the fracture zone has a significant effect on the post-cracking behaviour and that the required dosage of fibres could be decreased if specimens with longer fracture zones, i.e., panels or slabs, are used.","PeriodicalId":12122,"journal":{"name":"Fibers","volume":" ","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45734785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Use of Sawdust Fibers for Soil Reinforcement: A Review 木屑纤维在土壤加固中的应用综述
IF 3.9
Fibers Pub Date : 2023-07-03 DOI: 10.3390/fib11070058
Carlos J. Medina-Martinez, L. C. Sandoval Herazo, S. Zamora-Castro, R. Vivar-Ocampo, D. Reyes-González
{"title":"Use of Sawdust Fibers for Soil Reinforcement: A Review","authors":"Carlos J. Medina-Martinez, L. C. Sandoval Herazo, S. Zamora-Castro, R. Vivar-Ocampo, D. Reyes-González","doi":"10.3390/fib11070058","DOIUrl":"https://doi.org/10.3390/fib11070058","url":null,"abstract":"A frequent problem in geotechnics is soils with inadequate physical–mechanical properties to withstand construction work, incurring cost overruns caused by their engineering improvement. The need to improve the engineering properties of soils is not recent. The most common current alternatives are binders such as cement and lime. The climate change observed in recent decades and the uncontrolled emission of greenhouse gases have motivated geotechnical and geoenvironmental researchers to seek mechanisms for soil reinforcement from a more sustainable and environmentally friendly approach by proposing the use of recycled and waste materials. An alternative is natural fibers, which can be obtained as waste from many agro-industrial processes, due to their high availability and low cost. Sawdust, as a by-product of wood processing, has a rough texture that can generate high friction between the fiber and the matrix of the soils, leading to a significant increase in its shearing strength and bearing capacity. This concept of improving the properties of soils using natural fibers distributed randomly is inspired by the natural phenomenon of grass and/or plants that, when growing on a slope, can effectively stabilize the said slope.","PeriodicalId":12122,"journal":{"name":"Fibers","volume":" ","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45835014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Study of Efficient Tm-Doped Zinc-Tellurite Fiber Lasers at 2300 nm 2300 nm高效掺铥碲锌光纤激光器的数值研究
IF 3.9
Fibers Pub Date : 2023-06-26 DOI: 10.3390/fib11070057
E. Anashkina, A. Andrianov
{"title":"Numerical Study of Efficient Tm-Doped Zinc-Tellurite Fiber Lasers at 2300 nm","authors":"E. Anashkina, A. Andrianov","doi":"10.3390/fib11070057","DOIUrl":"https://doi.org/10.3390/fib11070057","url":null,"abstract":"Fiber laser sources operating near 2300 nm in the atmospheric transparency window are interesting for different applications, such as remote sensing, lidars, and others. The use of Tm-doped fiber lasers based on tellurite fibers is highly promising. We propose and theoretically study a highly efficient diode-pumped Tm-doped zinc-tellurite fiber laser operating at two cascade radiative transitions at 1960 nm and 2300 nm, with additional energy transfer between these laser waves due to the Raman interaction. We demonstrate numerically that a dramatic increase in the slope efficiency up to 57% for the laser wave at 2300 nm, exceeding the Stokes limit by 22% relative to the pump at 793 nm, can be obtained with optimized parameters thanks to Raman energy transfer from the laser wave at 1960 nm to the wave at 2300 nm.","PeriodicalId":12122,"journal":{"name":"Fibers","volume":" ","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42899602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The Current State and Prospects of Recycling Silk Industry Waste into Nonwoven Materials 丝绸工业废弃物再生利用的现状与展望
IF 3.9
Fibers Pub Date : 2023-06-19 DOI: 10.3390/fib11060056
E. Sashina, O. I. Yakovleva
{"title":"The Current State and Prospects of Recycling Silk Industry Waste into Nonwoven Materials","authors":"E. Sashina, O. I. Yakovleva","doi":"10.3390/fib11060056","DOIUrl":"https://doi.org/10.3390/fib11060056","url":null,"abstract":"Natural fibres are the preferred options for garment, technical and medical textiles, nonwovens and composites. Their sustainability is a considerable advantage, though the nature of silk production and processing involves a large amount of waste. The present review explores the current issues of recycling silk waste into nonwovens for various purposes. The article proposes obtaining nonwovens from short fibres using electrospinning of fibroin solutions in volatile solvents. Longer fibres are proposed to be processed into needle-punched nonwoven materials with a selection of an effective antistatic treatment.","PeriodicalId":12122,"journal":{"name":"Fibers","volume":" ","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42616450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Recent Achievements in Development of Chalcogenide Optical Fibers for Mid-IR Sensing 硫系化合物中红外传感光纤的研究进展
IF 3.9
Fibers Pub Date : 2023-06-16 DOI: 10.3390/fib11060054
V. Shiryaev, A. Velmuzhov, T. Kotereva, E. A. Tyurina, M. Sukhanov, E. Karaksina
{"title":"Recent Achievements in Development of Chalcogenide Optical Fibers for Mid-IR Sensing","authors":"V. Shiryaev, A. Velmuzhov, T. Kotereva, E. A. Tyurina, M. Sukhanov, E. Karaksina","doi":"10.3390/fib11060054","DOIUrl":"https://doi.org/10.3390/fib11060054","url":null,"abstract":"Recent results of research of passive and active optical waveguides made of high-purity chalcogenide glasses for middle infrared fiberoptic evanescent wave spectroscopy of liquid and gaseous substances are presented. On the basis of selenide and telluride glass fibers, novel types of highly sensitive fiber probes are developed. On the basis of Pr(3+)- and Tb(3+)-doped Ga(In)-Ge-As-Se and Ga-Ge-Sb-Se glass fibers, the 4.2–6 μm wavelength radiation sources are created for all-fiber sensor systems. Successful testing of chalcogenide glass fiber sensors for the analysis of some liquid and gaseous mixtures was carried out.","PeriodicalId":12122,"journal":{"name":"Fibers","volume":" ","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48335664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of Soft Composite Based Anisotropic Synthetic Skin for Biomechanical Testing 用于生物力学测试的基于软复合材料的各向异性合成皮肤的开发
IF 3.9
Fibers Pub Date : 2023-06-16 DOI: 10.3390/fib11060055
Vivek Gupta, Rohan Singla, Gurpreet Singh, A. Chanda
{"title":"Development of Soft Composite Based Anisotropic Synthetic Skin for Biomechanical Testing","authors":"Vivek Gupta, Rohan Singla, Gurpreet Singh, A. Chanda","doi":"10.3390/fib11060055","DOIUrl":"https://doi.org/10.3390/fib11060055","url":null,"abstract":"Human skin exhibits highly varying mechanical properties, thickness, hardness, and anisotropy by virtue of changing fiber distributions and orientations, across different body locations. To date, only a few studies have computationally simulated skin anisotropy and no experimental study on synthetic skin exists which can mimic the accurate biomechanical properties of the skin. In this work, unique anisotropic synthetic skin samples were created using an elastic composite-based structure. Both single and multi-layer synthetic skin were fabricated with consistent fiber density and fiber dimensions and varying fiber angles to generate over 100 compositions. The compositions implied stress versus stretch responses in mechanical biaxial testing were compared to those of the skin of a person. Hyperelastic constitutive models were used to characterize the non-uniform test results. The created anisotropic synthetic skin must be essential for reliable Biomechanical investigation of skin free from ethical concerns, undertaking medical training and researching skin pathophysiology and injuries.","PeriodicalId":12122,"journal":{"name":"Fibers","volume":" ","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48735644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Failure Mode Prediction of Unreinforced Masonry (URM) Walls Retrofitted with Cementitious Textile Reinforced Mortar (TRM) 纤维增强水泥砂浆(TRM)加固无筋砌体(URM)墙体的破坏模式预测
IF 3.9
Fibers Pub Date : 2023-06-15 DOI: 10.3390/fib11060053
Athanasia K. Thomoglou, Martha A. Karabini, D. Achillopoulou, T. Rousakis, C. Chalioris
{"title":"Failure Mode Prediction of Unreinforced Masonry (URM) Walls Retrofitted with Cementitious Textile Reinforced Mortar (TRM)","authors":"Athanasia K. Thomoglou, Martha A. Karabini, D. Achillopoulou, T. Rousakis, C. Chalioris","doi":"10.3390/fib11060053","DOIUrl":"https://doi.org/10.3390/fib11060053","url":null,"abstract":"The brittle failure of unreinforced masonry (URM) walls when subjected to in-plane loads present low shear strength remains a critical issue. The investigation presented in this paper touches on the retrofitting of URM structures with textile-reinforced mortar (TRM), which enables shifting the shear failure mode from a brittle to a pseudo-ductile mode. Despite many guidelines for applying composite materials for retrofitting and predicting the performance of strengthened structures, the application of TRM systems in masonry walls is not extensively described. A thorough retrospect of the literature is presented, containing research results relating to different masonry walls, e.g., bricks, cement, and stone blocks strengthened with TRM jackets and subjected to diagonal compression loads. The critical issue of this study is the failure mode of the retrofitted masonry walls. Available prediction models are presented, and their predictions are compared to the experimental results based on their failure modes. The novelty of this study is the more accurate failure mode prediction of reinforced masonry with TRM and also of the shear strength with the proposed model, Thomoglou et al., 2020, at an optimal level compared to existing regulations and models. The novel prediction model estimates the shear failure mode of the strengthened wall while considering the contribution of all components, e.g., block, render mortar, strengthening textile, and cementitious matrix, by modifying the expressions of the Eurocode 8 provisions. The results have shown that the proposed model presents an optimum accuracy in predicting the failure mode of all different masonry walls strengthened with various TRM jackets and could be taken into account in the regulations for reliable forecasting.","PeriodicalId":12122,"journal":{"name":"Fibers","volume":" ","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45482340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Optimization of the Core Compound for Ytterbium Ultra-Short Cavity Fiber Lasers 镱超短腔光纤激光器核心化合物的优化
IF 3.9
Fibers Pub Date : 2023-06-13 DOI: 10.3390/fib11060052
A. Rybaltovsky, M. Yashkov, A. Abramov, A. Umnikov, M. Likhachev, D. Lipatov
{"title":"Optimization of the Core Compound for Ytterbium Ultra-Short Cavity Fiber Lasers","authors":"A. Rybaltovsky, M. Yashkov, A. Abramov, A. Umnikov, M. Likhachev, D. Lipatov","doi":"10.3390/fib11060052","DOIUrl":"https://doi.org/10.3390/fib11060052","url":null,"abstract":"Highly ytterbium-, aluminum- and phosphorus-co-doped silica fibers with low optical losses were fabricated by the MCVD method, utilizing an all-gas-phase deposition technique. Optical and laser properties of the active fibers with a phosphosilicate and aluminophosphosilicate glass cores doped with 1.85 mol% and 1.27 mol% Yb2O3 were thoroughly investigated. With the help of hydrogen loading, it was possible to induce highly reflective Bragg grating in both fiber samples using the standard phase-mask technique and 193 nm-UV laser irradiation. The ultra-short (less than 2 cm long) Fabry–Perot laser cavities were fabricated by inscribing two fiber Bragg gratings (highly and partially reflective FBGs) directly in the core of the fiber samples. The highest pump-to-signal conversion efficiency of 47% was demonstrated in such laser configuration using phosphosilicate fiber. The reasons for the low efficiency of aluminophosphosilicate fiber are discussed.","PeriodicalId":12122,"journal":{"name":"Fibers","volume":" ","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49474987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Refinement of Backward Correlation Technique for Precise Brillouin Frequency Shift Extraction 精确提取布里渊频移的一种改进后向相关技术
IF 3.9
Fibers Pub Date : 2023-06-12 DOI: 10.3390/fib11060051
F. Barkov, A. Krivosheev, Y. Konstantinov, A. R. Davydov
{"title":"A Refinement of Backward Correlation Technique for Precise Brillouin Frequency Shift Extraction","authors":"F. Barkov, A. Krivosheev, Y. Konstantinov, A. R. Davydov","doi":"10.3390/fib11060051","DOIUrl":"https://doi.org/10.3390/fib11060051","url":null,"abstract":"A new method for extracting the Brillouin frequency shift (BFS) from the Brillouin gain spectrum (BGS), the modified backward correlation method (MBWC), is presented. The possibilities of using MBWC, and MBWC in combination with the Lorentzian curve fitting (LCF) based on Levenberg–Marquardt (LM) method, are studied. The effectiveness of the new method, and its combination with LM, has been demonstrated for processing spectra with a low signal-to-noise ratio (SNR). The experiments, which were in good agreement with the performed simulation, showed that at SNR = 0 dB, the combined (MBWC + LM) method provided the BFS extraction error of less than 4 MHz, while the state-of-the-art LM algorithm extracted it with the error greater than 4.5 MHz. The advantage of correlation methods becomes more significant with the decreasing SNR: at SNR = −2 dB, the LM’s error is 14.3 MHz, and that of the combined one is 8.1 MHz.","PeriodicalId":12122,"journal":{"name":"Fibers","volume":" ","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43777700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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