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    Wyświetlanie 1-9 z 9
    Tytuł:
    Stress evolution mechanism and thermo-mechanical reliability analysis of copper-filled TSV interposer
    Autorzy:
    Chen, Yuan
    Su, Wei
    Huang, Hong-Zhong
    Lai, Ping
    Lin, Xiao-ling
    Chen, Si
    Powiązania:
    https://bibliotekanauki.pl/articles/1841909.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    through silicon vias
    thermo-mechanical reliability
    failure mechanism
    finite element analysis
    3D integrated packaging
    thermal cycling experiment
    Opis:
    Through silicon via (TSV) has become one of the key emerging trends of three-dimensional (3D) packages, as it can realize vertically interconnect between stacked-dies. Due to large mismatch in thermal expansion coefficients (CTE) between the copper via and the silicon, significant mechanical stresses are induced at the interfaces when TSV structure is subjected to thermal stresses, which would greatly affect the reliability and electrical performance of TSV 3D device. In this paper, the relationship between the state of stresses and failure of TSV had been explored by combining finite element model simulation (FEM) and failure physical analysis. The position of the maximum stress of the TSV structure was obtained by FEM analysis. The relationship of stress and displacement change with temperature was also studied. And a thermal cycling experiment was conducted to validate the simulation results. Physical failure analysis after thermal cycling experiment was used to verify the degradation mechanism predicted by thermo-mechanical simulation.
    Źródło:
    Eksploatacja i Niezawodność; 2020, 22, 4; 705-714
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of Dendrite Morphology and Micro-Segregation in U-Nb Alloy During Solidification
    Autorzy:
    Su, Bin
    Liu, Jing-Yuan
    Zhang, Xiao-Peng
    Yan, Xue-Wei
    Powiązania:
    https://bibliotekanauki.pl/articles/2174585.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    U-Nb alloys
    solidification process
    dendrite growth
    cellular automaton
    numerical simulation
    Opis:
    Due to the importance of uranium and uranium alloys to national defence and nuclear industrial applications, it is necessary to understand dendrite formation in their solidification structures and to control their microstructures. In this study, a modified cellular automaton model was developed to predict 2-D and 3-D equiaxed dendrite growth in U-Nb alloys. The model takes into account solute diffusion, preferential growth orientation, interface curvature, etc., and the solid fraction increment is calculated using the local level rule method. Using this model, 2-D large-scale and 3-D equiaxed dendrite growth with various crystallographic orientations in the U-5.5Nb alloy were simulated, and the Nb micro-segregation behaviour during solidification was analysed. The simulated results showed reasonable agreement with the as-cast microstructure observed experimentally.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1333--1339
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and characterization of high count yak wool yarns spun by complete compacting spinning and fabrics knitted from them
    Przygotowanie i charakterystyka przędz o dużej masie liniowej z wełny jaków przędzionych systemem kompaktowym rotorowym oraz dzianiny wykonane z tych przędz
    Autorzy:
    Li, W.
    Liu, X.
    Liu, C.
    Su, X.
    Xie, C.
    Wei, Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/232629.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    yak wool
    pure high count yarns
    complete compacting spinning
    CCS
    yarn quality
    knitted wearability
    przędza z jaka
    przędzenie kompaktowe
    przędzenie obrączkowe
    jakość przędzy
    Opis:
    The attentions of the textile industry has been attracted by yak wool due to its excellent properties, environmental friendly characteristics and inexpensive prices. However, the processing of yak wool is difficult due to the larger fiber dispersion and stiffness, especially spun pure and high count yak wool yarn. Therefore, in this paper, a kind of roller-type compact spinning - complete compacting spinning (CCS) was applied to spun pure high count yak wool yarns, in which a special hollow roller made of stainless steel with a strip groove structure on its surface was employed. Based on the mechanism of CCS, the processing parameters for two kinds of yak wool yarns - 20.83 tex and 16.67 tex were set. Then the qualities of the yarns prepared were tested and compared with yak wool yarns spun by common ring spinning. Finally corresponding knitted fabrics were further produced and tested for wearability.
    Przemysł włókienniczy zainteresowany jest produkcją przędzy z jaków dzięki jej dobrej właściwości termicznej, przyjaznych ekologicznie warunkom hodowli i niskim cenom. Jednakże przetwarzanie wełny jaków jest trudne ze względu na duże rozrzuty właściwości tych włókien i ich sztywność co uwidacznia się szczególnie przy przędzeniu wełny jaków o dużych masach liniowych. Dla rozwiązania tego zagadnienia opracowano specjalny system przędzenia oparty na przędzeniu kompaktowym z zastosowaniem wydrążonego wałka ze stali kwasoodpornej ze szczeliną o odpowiedniej strukturze na jego powierzchni. Przedstawiono wytwarzanie przędz o masie liniowej ok. 20,8 tex i 16,7 tex. Właściwości wyprzędzionych przędź porównano z właściwościami przędz otrzymanych za pomocą konwencjonalnego przędzenia obrączkowego. Badania zakończono wyprodukowaniem i sprawdzeniem właściwości użytkowych różnych wyrobów dziewiarskich.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2016, 1 (115); 30-35
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local Structure Around Te in Heavily Doped GaAs:Te using X-Ray Absorption Fine Structure
    Autorzy:
    Pietnoczka, A.
    Bacewicz, R.
    Slupinski, T.
    Antonowicz, J.
    Wei, Su-Huai
    Powiązania:
    https://bibliotekanauki.pl/articles/1431547.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cj
    61.72.uj
    Opis:
    The annealing of heavily doped GaAs:Te can significantly change the free electron concentration in a reversible manner. These changes of electrical properties are accompanied by the structural changes of GaAs:Te solid solution. We used X-ray Absorption Fine Structure at K-edge of tellurium to determine local changes around Te atoms for different states of the GaAs:Te crystals caused by the annealing corresponding to different electron concentrations. The best EXAFS fit for the samples with high electron concentration was obtained for the substitutional $Te_{As}$ model with elongated Te-Ga bonds (as compared to the As-Ga distance). For the samples in the low concentration state the best fit was for the pairs of Te atoms forming a rhombohedral symmetry double-DX centre, with the proportional admixture of the substitutional tellurium
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 879-882
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Correlation between the Structure and Quality of Compact Blend Yarns
    Ocena korelacji pomiędzy strukturą i jakością mieszankowych przędz kompaktowych przędzionych dwoma różnymi przędzarkami obrączkowymi
    Autorzy:
    Li, W.
    Su, X.
    Zhang, Y.
    Xie, C.
    Wei, Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/233941.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    pneumatic compact spinning
    blend yarn
    hamilton index method
    high speed camera
    pneumatyczne przędzarki kompaktowe
    mieszankowe przędze
    Metoda indeksu Hamiltona
    szybkobieżna kamera cyfrowa
    Opis:
    Pneumatic compact spinning is the most widely used compact spinning technology at present, which is implemented by using negative airflow to condense the fibre bundle and decrease the spinning triangle. Roller-type and Lattice apron-type compact spinning are two major kinds of pneumatic compact spinning now. In this paper, blend yarn qualities spun by one kind of roller-type compact spinning: complete condensing spinning (CCS), and one kind of Lattice apron-type compact spinning: 4-line rollers compact spinning (FRCS) were studied and analysed comparatively. First, 28.1, 18.5 and 12.3 tex JC60/T40 blend yarns and 18.5, 14.8 and 11.8 tex JC35/T65 blend yarns were spun on two kinds of compact spinning systems, respectively, and the effects of the blending ratio on yarn qualities were discussed. Then another two kinds of cotton blended yarns - JC60/R40 and JC60/M40 were spun. 28.1, 18.5, 14.8 tex JC60/R40 and 18.5, 14.8, 11.8 tex JC60/M40 were spun on two kinds of compact spinning systems, respectively. Meanwhile the qualities of spun yarns were analysed by using two methods. First with a high speed camera system - OLYMPUS i-speed3 (OLYMPUS Image Co., Ltd., Japan), the condensing process of a fibre strand in the condensing zones were captured and analysed. Second the cross sections of the spun yarns were presented using a Y172 Hardy’s thin cross-section sampling device (Nantong Hongda Experiment Instruments Co., Ltd., China). The corresponding Hamilton Index was then calculated, and the fibre radial distributions in the yarn cross section were analysed. The results show that the fibre condensing effects are increased with an increase in the ratio of cotton fibre on the blended yarn for both kinds of compact spinning, especially the FRCS. Meanwhile with an increase in the ratio of polyester fibre on the blended yarn, the advantage of CCS with respect to yarn qualities increased. For both JC60/R40 and JC60/M40, cotton fibres are transferred to the outer part of the yarn body. However, the fibres in JC60/R40 yarn spun by CCS and those in JC60/M40 yarn spun by FRCS are distributed more randomly.
    Przędzenie kompaktowe realizowane na zmodyfikowanych przędzarkach obrączkowych jest obecnie najbardziej rozpowszechnioną techniką przędzalniczą, która została wprowadzona na skalę przemysłową dzięki wykorzystaniu podciśnienia mającego na celu zagęszczenie przetwarzanego w przędzę strumienia włókien oraz zmniejszenie trójkąta przędzenia. Celem prezentowanych przez autorów badań była ocena porównawcza jakości i struktury przędz kompaktowych wytworzonych dwoma systemami kompaktowania. Przedstawiono wyniki badań jakości przędz obrączkowych kompaktowych mieszankowych. Przędze te wyprzędziono z mieszanek bawełny z włóknami poliestrowymi o udziale 65/35, mieszanek bawełny z jedwabiem celulozowym o udziale 60/40 oraz mieszanek bawełny z modalnymi włóknami wiskozowymi o udziale 60/40. Wytworzone przędze analizowano dwoma różnymi metodami. Pierwsza metoda polegała na rejestrowaniu za pośrednictwem szybkobieżnej kamery cyfrowej procesu zagęszczania tasiemki włókien w strefie jej zagęszczania, a następnie analizowaniu struktury tworzącej się przędzy. W drugiej metodzie sporządzano, przy pomocy stanowiska pomiarowego wyposażonego w urządzenie przeznaczone do pobierania próbek oraz mikroskopu, obrazy przekrojów poprzecznych wytworzonych przędz, a także obliczano odpowiednio wskaźniki migracji włókien w przekroju poprzecznym przędzy reprezentowane przez indeksy Hamiltona.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2015, 6 (114); 55-67
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of electrical resistivity, residual stress and surface roughness of sputtering indium tin oxide films with different thicknesses
    Autorzy:
    Tien, Chuen-Lin
    Lin, Tsai-Wei
    Su, Shu-Hui
    Powiązania:
    https://bibliotekanauki.pl/articles/2033888.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    indium tin oxide
    magnetron sputtering
    residual stress
    surface roughness
    Opis:
    This paper investigates the influence of film thickness on the electrical and mechanical properties of transparent indium tin oxide (ITO) thin films. Two groups of ITO thin films deposited on unheated substrates were prepared by the radio-frequency magnetron sputtering technique. The biaxial residual stress and surface roughness for two groups of ITO thin films were measured by a Twyman–Green interferometer and a Linnik microscopic interferometer, respectively. The electrical resistivity of the ITO films was measured by a four-point probe apparatus, the thickness was determined mechanically with a profilometer. The measurement results show that the average resistivity of ITO thin films decreases with increasing the deposited thickness. The compressive residual stress in the ITO thin films decreases with increasing the deposited thickness. We also find that an anisotropic stress in the two groups of ITO films is more compressive in a certain direction. The RMS surface roughness in the two groups of ITO films is less than 1 nm.
    Źródło:
    Optica Applicata; 2021, 51, 4; 499-512
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Double-image encryption algorithm based on discrete fractional angular transform and fractional Fourier transform
    Autorzy:
    Qiu, Tian
    Dai, Wei-Hua
    Chen, Su-Hua
    Zhou, Hang
    Gong, Li-Hua
    Powiązania:
    https://bibliotekanauki.pl/articles/2172857.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chaotic system
    fractional transform
    discrete fractional angular transform
    double-image encryption
    Opis:
    By combining fractional Fourier transform with discrete fractional angular transform, a double-image encryption algorithm is designed. The discrete cosine transform is performed on two grayscale images to generate a spectrum image, and then the generated spectrum image is compressed into an image with Zigzag scanning. The compressed image is processed with the discrete fractional angular transform, and then fractional Fourier transform and double random phase coding are executed on the image. The DNA operation controlled by chaotic system is introduced to change the pixel values. Finally, the ciphertext image is obtained through bit-level permutation and pixel adaptive diffusion. The statistical information of the plaintext images is employed as the input of the SHA-256 to calculate the initial conditions of the chaotic map. Simulation experiments demonstrate that the double-image encryption algorithm can effectively reduce the correlation among adjacent pixels of the plaintext images.
    Źródło:
    Optica Applicata; 2022, 52, 4; 669--684
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Association of SRAP markers with juvenile wood basic density and growth traits in Cunninghamia lanceolata (Lamb.) Hook
    Autorzy:
    Hu, Dehuo
    Su, Yan
    Wu, Shujuan
    Wu, Jiezhen
    Wang, Runhui
    Yan, Shu
    Wei, Ruping
    Zheng, Huiquan
    Powiązania:
    https://bibliotekanauki.pl/articles/956957.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    chinese fir
    srap
    diversity
    wood basic density
    association analysis
    Opis:
    Application of sequence-related amplified polymorphism (SRAP) markers to unravel variations and relationships with biological and morphological traits has been reported in a variety of plant species, and their potential for breeding has also been highlighted. (1) Assess the diversity level of a Cunninghamia lanceolata (Chinese fir) genetic panel based on phenotypic traits and SRAP markers, (2) identify SRAP loci linked to juvenile wood basic density (JWBD) and growth traits, and (3) address the overlap of the trait-associated SRAP markers during the juvenile and mature stages of this species. A total of 227 Chinese fir genotypes were subjected to phenotype, SRAP genotyping, and marker-trait association analyses. A total of 564 unambiguous SRAP bands and 558 polymorphic loci were identified from the genotypes. The overall percentage of polymorphic bands, polymorphism information content, Nei’s gene diversity, and Shannon’s Information Index were 98.9%, 0.2576, 0.3196 and 0.4838, respectively. An analysis of molecular variance further demonstrated that the genotypes varied significantly at SRAP polymorphisms (p < 0.01). A wide genetic distance span from 0.0531 to 0.9097 was also observed; most (94.9%) fell within the range of 0.3000–0.6999. An association analysis based on general linear model (GLM) and mixed linear model (MLM) unraveled 21, 26, 25, and 19 marker-trait associations for JWBD, height (H), diameter at breast height (DBH, 1.3 m) and stem volume (V), respectively. These marker-trait associations corresponded to 64 different SRAP markers; 46 of these were linked to only one trait, while the other 18 markers appeared to be associated with more than one trait but limited to growth traits. Overall, the SRAP markers represented R2 (percentage of the phenotypic variation explained by marker) values of 1.7–9.2% for the GLM and 1.7–5.6% for the MLM. Strikingly, the significant trait-associated marker list seemed to be rather different from that of the previous study performed on mature traits (WBD, H, DBH and V), except for overlap of two markers. This study demonstrated an association of SRAP markers with JWBD and growth traits in Chinese fir. The results further our understanding of the genetic basis of the Chinese fir WBD and growth traits at the juvenile stage.
    Źródło:
    Dendrobiology; 2018, 79; 111-118
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A BIM technology-based underwater structure damage identification and management method
    Autorzy:
    Li, Xiaofei
    Su, Rongrong
    Cheng, Peng
    Sun, Heming
    Meng, Qinghang
    Song, Taiyi
    Wei, Mengpu
    Zhang, Chen
    Powiązania:
    https://bibliotekanauki.pl/articles/2204531.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    building information modeling
    underwater structural disease
    damage identification
    deep learning
    modelowanie informacji o budynku
    identyfikacja uszkodzeń
    uczenie głębokie
    uszkodzenie podwodnej konstrukcji
    Opis:
    With the continuous development of bridge technology, the condition assessment of large bridges has gradually attracted attention. Structural Health Monitoring (SHM) technology provides valuable information about a structure's existing health, keeping it safe and uninterrupted use under various operating conditions by mitigating risks and hazards on time. At the same time, the problem of bridge underwater structure disease is becoming more obvious, affecting the safe operation of the bridge structure. It is necessary to test the bridge’s underwater structure. This paper develops a bridge underwater structure health monitoring system by combining building information modeling (BIM) and an underwater structure damage algorithm. This paper is verified by multiple image recognition networks, and compared with the advantages of different networks, the YOLOV4 network is used as the main body to improve, and a lightweight convolutional neural network (Lite-yolov4) is built. At the same time, the accuracy of disease identification and the performance of each network are tested in various experimental environments, and the reliability of the underwater structure detection link is verified.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 2; art. no. e144602
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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