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    Wyświetlanie 1-6 z 6
    Tytuł:
    High Efficiency Covering Technology for Covered Yarn Production: Controlling the Spandex Yarn Draw Ratio
    Wysokowydajna technologia produkcji przędzy oplatanej z zastosowaniem kontroli współczynnika rozciągania przędzy spandexowej
    Autorzy:
    Feng, Pei
    Liu, Dashuang
    Yang, Chongchang
    Powiązania:
    https://bibliotekanauki.pl/articles/233862.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    tension controlled
    elastic fibre
    draw ratio
    spandex covered yarns
    naprężenie kontrolowane
    włókno elastyczne
    współczynnik rozciągania
    przędza pokryta spandeksem
    Opis:
    This paper proposes a new covered yarn system in which the tension of spandex elastic yarn drawing is controlled. By analysing the relationship between the draw ratio and yarn tension, it was verified that the new tension controlled drawing system is feasible and results in yarns of superior quality and process stability.
    W pracy zaproponowano nowy system wytwarzania przędzy oplatanej, w którym kontrolowane jest naprężenie rozciągania przędzy elastycznej spandex. Analizując zależność między współczynnikiem rozciągania a naprężeniem przędzy, zweryfikowano, że zaproponowany system ciągnienia z kontrolowanym naprężeniem jest wykonalny i zapewnia wytworzenie przędzy o najwyższej jakości z zachowaniem stabilności procesu.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2020, 6 (144); 24-28
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution of the Polymer Melt Velocity and Temperature in the Spinneret Channel of Bi-component Fibre Melt Spinning: a Mathematical Model
    Autorzy:
    Feng, Pei
    Liu, Dashuang
    Zhang, Ronggen
    Yang, Chongchang
    Powiązania:
    https://bibliotekanauki.pl/articles/2056290.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    composite fibre
    spinning assembly
    velocity field distribution
    mathematical model
    Opis:
    For the stability of composite fibre spinning, the difference in and distribution of the polymer melt velocity during the spinning are among the factors of importance. Based on the basic equation for the control of composite spinning dynamics, boundary conditions are identified and reported in this paper. A mathematical model for the symmetric and asymmetric distribution of the melt flow velocity in the microhole of the spinneret of the composite spinning assembly was developed. The accuracy of the mathematical model was also ascertained. It gives a theoretical basis for the designing of a composite spinning assembly.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2021, 6 (150); 49--53
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design Of the Tension Mechanism Of a Knotter And Optimization Of the Motion Parameters
    Autorzy:
    Lan, Jiahao
    Feng, Pei
    Zhang, Junping
    Zhang, Ronggen
    Yang, Chongchang
    Powiązania:
    https://bibliotekanauki.pl/articles/2200745.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    chemical fiber
    filament knotting process
    knotter
    catenary
    knotting rate
    Opis:
    Currently, the knotting of chemical fiber filament packages in factories primarily comprises manual operations. It also has a high labor intensity and is subject to artificial subjective factors, due to which it is difficult to guarantee the quality of the finished fiber products. Furthermore, it also significantly restricts the intelligent construction of chemical fiber production. This work employs partially oriented yarn (POY) and full draw yarn (FDY) to develop an automatic knotting device. The catenary theory was used to confirm the state of the yarn and to determine the relevant parameters of the tension mechanism. The results showed that the developed automatic knotting device satisfactorily meets the conditions required for manual knotting. The curve equation that was calculated using the catenary conformations of the yarn state verified that the actual yarn state was consistent with the theory. Moreover, the work provides a theoretical foundation for subsequent mechanism optimizations.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2022, 6 (151); 12--18
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on visible light indoor positioning algorithm based on fire safety
    Autorzy:
    Li, Mao
    Jiang, Feng
    Pei, Cong
    Powiązania:
    https://bibliotekanauki.pl/articles/174338.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    indoor positioning algorithm
    camera
    indoor positioning system
    Opis:
    From the perspective of ensuring life safety, combined with the advantages of high-speed time response and energy conservation of white light emitting diodes (LEDs), the visible light indoor positioning algorithm based on fire safety is proposed in the paper. First, the model is designed which needs three LED lights arranged in a straight line and positioned in the geographically north direction on the top of the model. Then, the proposed algorithm is discussed and analyzed when the camera is located at the center of the model and facing north, when the camera is located at the center of the model and the angle is rotated, and when the camera is located at any position of the model, respectively. It can accurately calculate the current position of the camera, its response speed is fast and the positioning accuracy is high. Furthermore, this paper also verifies the practicability and reliability of the algorithm by designing the visible light indoor positioning system based on fire safety rescue in natural environment and smoke environment. The experimental results show that the positioning error does not exceed 0.70 cm in smoke environment.
    Źródło:
    Optica Applicata; 2020, 50, 2; 209-222
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic emission characteristics of deep granite under triaxial cylic loading and unloading
    Autorzy:
    Pei, Feng
    Zhang, Yue-Zheng
    Zhao, Ji-Wei
    Geng, Jing-Ming
    Powiązania:
    https://bibliotekanauki.pl/articles/1402362.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    deep granite
    acoustic emission
    frequency spectrum
    precursory feature recognition
    Opis:
    In order to obtain the damage and AE characteristics of deep granite, TAW-2000 electrohydraulic servo rigid testing equipment and PCI-2 acoustic emission acquisition system were used to clarify the relationship between AE characteristics and stress level under conventional triaxial and cyclic loading and unloading. The results show that: AE characteristic parameters such as counts and energy under different confining pressures have good consistency in reflecting cracks growth process, which correspond to the stress level of rock sample; Before the critical failure, the AE amplitude increases significantly and extremely high peak frequency and extremely low peak frequency began to appear; The phenomenon that peak frequency band number increases significantly can be used as the precursor of rock failure; The change trend of characteristic parameters, amplitude and peak frequency band were related to the stress level of rock, and the loading path has little influence on it, which verified the effectiveness of AE precursory feature recognition; FR value decreases continuously with the increase of cyclic stress level and overall trend is downward, which indicated that AE memory gradually decreases as the stress level increases; From the perspective of damage mechanics, the AE characteristics of rock before failure are explained reasonably by the development of damage rate.
    Źródło:
    Mining Science; 2020, 27; 209-225
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Lujiatun-like dinosaurian assemblage from the Jehol Biota of Ningcheng, Inner Mongolia, Northeast China
    Autorzy:
    Zhang, H.
    Yu, D.
    Feng, Y.
    Pei, R.
    Zhou, C.-F.
    Powiązania:
    https://bibliotekanauki.pl/articles/31341389.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    dinosaur
    Jehol Biota
    Ningcheng county
    Yixian Formation
    fossil
    fauna composition
    Early Cretaceous
    Cretaceous
    Inner Mongolia
    China
    Źródło:
    Acta Palaeontologica Polonica; 2022, 67, 3; 617-621
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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