Autor: Liu, Meng - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Static and dynamic test analysis of a 12-years old 14 000-ton cable-stayed bridge used swivel construction technology
Autorzy:: Liu, Meng
Sun, Quansheng
Yu, Haitao
Yang, Jianxi
Zhang, Tongzhou
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2036414.pdf Link otwiera się w nowym oknie
Opis:: In order to study the change in performance of the Suifenhe cable-stayed bridge in China over 12 years, cable force, elevation, static and dynamic load tests were conducted in 2006 and 2018, respectively. In this paper, theoretical data, obtained through finite element model analysis, were compared with the measured load test data for changes in static and dynamic performances. A comparison between 2006 and 2018 shows that additional dead load deflection exists in the main span after 12 years of operation. And that the cable force due to dead load of the full-scale cable-stayed bridge decreases and redistributes, which have adverse effects on the safety of bridge structure after long-term operations. Therefore, on-site inspection, static and dynamic load tests are reco mmended for cable-stayed bridges over 10-years old to test their static and dynamic performance. Moreover, cable force adjustments are to be conducted whenever necessary for the cable-stayed bridge used swivel construction.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Exploring the Influence of NC on the Crystallization of HTPE
Autorzy:: Ren, Zhi
Li, Xiaojiang
Liu, Meng
Zhang, Xi
Xie, Linsheng
Tematy:: materials science
nitrocellulose
hydroxy terminated polyether
blending
crystallize; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:: https://bibliotekanauki.pl/articles/59115376.pdf Link otwiera się w nowym oknie
Opis:: A series of polymer blends of nitrocellulose (NC) and hydroxy terminated polyether (HTPE) in different proportions were prepared by a solution mixing method. The diffraction peak positions and peak intensities of the blends were analyzed by X-ray diffraction. The relative crystallinity of HTPE in the blends was analyzed by differential scanning calorimetry. The crystal morphology of the NC/HTPE blends was observed with a polarizing microscope. The results demonstrated that there is a certain degree of crystallinity in pure HTPE, while the crystallinity of NC/HTPE blends was gradually decreased as NC was added. In addition, when the mass fraction of NC in the blends was more than 40%, the crystallinity of the blends was hardly observed by these characterization methods, which demonstrated that the crystallinity of HTPE could be easily inhibited by NC.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Effect of BaO and Li2O on Basic Characteristics of Mold Fluxes with Different Basicity
Autorzy:: Wang, Haichuan
Sheng, Guang-ye
Wang, Haijun
Liu, Hong-meng
Wu, Ting
Tematy:: mold fluxes
lubrication
heat transfer; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59110663.pdf Link otwiera się w nowym oknie
Opis:: Lubrication and heat transfer control are two significant functions of mold fluxes. In order to coordinate the contradiction between lubrication and heat transfer, the effects of BaO and Li2O on basic characteristics of CaO-SiO2 based mold fluxes were studied by hemispherical melting temperature instrument, rotating cylinder method, X-ray diffractometer (XRD) in present study. The results show that the melting temperature and viscosity at 1300°C all represent a downward trend with BaO and Li2O enhancement at different basicity, and the break temperature decrease with BaO addition while decrease and then increase with Li2O addition, which illustrates that Li2O content should be no more than 0.8 wt% for the purpose of lubrication. Meanwhile, to ensure a sufficient thickness of the liquid slag film and avoid discontinuity of the liquid slag film, the BaO content is better to be 10 wt% with low melting temperature and viscosity. The main crystalline phase in the mold fluxes is cuspidine (3CaO·2SiO2·CaF2), and the crystallization ratio rises sharply when basicity increased to 1.65. For better deal with the contradiction of lubrication and heat transfer, the mold fluxes composition w(BaO) = 10 wt%, w(Li2O) = 0.8 wt%, R ≥1.65 is reasonable, which has a profound impact on high crystallization and lubricity mold fluxes.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: On the restricted arc-connectivity of oriented graphs
Autorzy:: Liu, Xuemei
Meng, Jixiang
Tematy:: oriented graph
line digraph
diameter
$\lambda^'$-optimal
super-$\lambda^'$; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:: https://bibliotekanauki.pl/articles/63482057.pdf Link otwiera się w nowym oknie
Opis:: For a strong digraph D, the restricted arc-connectivity $\lambda^'(D)$ is defined as the minimum cardinality over all restricted arc-cuts $S$ satisfying that $D-S$ has a non-trivial strong component $D_1$ such that $D-V(D_1)$ contains an arc. In this paper, we prove that a strong oriented black graph $D$ with $ \text{diam}(D)\leq 2l_2-2$ is $\lambda^'$-optimal if $\delta(D) \geq 2$ and $D$ is super-$\lambda^'$ if $\delta(D)\geq 3$, where $l_2$ is a parameter related with path lengths of $D$.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Dominated pair degree sum conditions of supereulerian digraphs
Autorzy:: Dong, Changchang
Meng, Jixiang
Liu, Juan
Tematy:: supereulerian digraph
spanning eulerian subdigraph
dominated pair degree sum condition; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:: https://bibliotekanauki.pl/articles/59898861.pdf Link otwiera się w nowym oknie
Opis:: A digraph $D$ is supereulerian if $D$ contains a spanning eulerian subdigraph. In this paper, we propose the following problem: is there an integer $t$ with $0\leq t\leq n-3$ so that any strong digraph with $n$ vertices satisfying either both $d(u) \geq n -1+ t$ and $d(v) \geq n-2- t$ or both $d(u) \geq n-2- t$ and $d(v) \geq n -1+ t$, for any pair of dominated or dominating nonadjacent vertices $\{u, v\}$, is supereulerian? We prove the cases when $t=0,t=n-4$ and $t=n-3$. Moreover, we show that if a strong digraph $D$ with $n$ vertices satisfies min$\{d^+(u) + d^- (v), d^- (u) + d^+(v)\}\geq n-1$ for any pair of dominated or dominating nonadjacent vertices $\{u,v\}$ of $D$, then $D$ is supereulerian.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Antidirected spanning trail of digraphs with $\alpha_{2}$-stable number 3
Autorzy:: Yang, Hong
Liu, Juan
Meng, Jixiang
Tematy:: $\alpha_{2}$-stable set
antidirected spanning trail
complete graph
digraph; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:: https://bibliotekanauki.pl/articles/63381474.pdf Link otwiera się w nowym oknie
Opis:: Let $D$ be a digraph with vertex set $V(D)$ and arc set $A(D)$. An antidirected spanning trail of $D$ is a spanning trail in which consecutive arcs have opposite directions and each arc of $D$ occurs at most once. Let $\alpha_{2}(D) = \max\{|X| : X \subseteq V(D)$ and $D[X]$ has no 2-cycle$\}$ be the $\alpha_{2}(D)$-stable number. When $\alpha_{2}(D)=2$, we have demonstrated that every weakly connected digraph $D$ with $\alpha_{2}(D)=2$ has an antidirected Hamiltonian path, and have provided a necessary and sufficient condition for strongly connected digraph $D$ with $\alpha_{2}(D)=2$ to have an antidirected Hamiltonian cycle. In this paper, we first determine two families $ \mathcal{D}_{1} $ and $ \mathcal{D}_{2} $ of well-characterized strongly connected digraphs with $\alpha_{2}$-stable number 3 such that, for any strongly connected digraph $ D\in \mathcal{D}_{1}\cup \mathcal{D}_{2} $, $D$ does not have an antidirected spanning trail. And, we further prove that every strongly connected digraph $D$ with $\alpha_{2}(D)=3$ has an antidirected spanning trail if and only if $ D\notin \mathcal{D}_{1}\cup \mathcal{D}_{2} $.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Arbitrarily Partitionable {2K₂, C₄}-Free Graphs
Autorzy:: Liu, Fengxia
Wu, Baoyindureng
Meng, Jixiang
Tematy:: arbitrarily partitionable graphs
arbitrarily vertex decomposable
threshold graphs
{2 K 2, C 4 }-free graphs; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:: https://bibliotekanauki.pl/articles/32361721.pdf Link otwiera się w nowym oknie
Opis:: A graph G = (V, E) of order n is said to be arbitrarily partitionable if for each sequence λ = (λ₁, λ₂, …, λ_p) of positive integers with λ₁ + … +λ_p = n, there exists a partition (V₁, V₂, … , V_p) of the vertex set V such that V_i induces a connected subgraph of order λ_i in G for each i ∈ {1, 2, …, p}. In this paper, we show that a threshold graph is arbitrarily partitionable if and only if it admits a perfect matching or a near perfect matching. We also give a necessary and sufficient condition for a {2K₂, C₄}-free graph being arbitrarily partitionable, as an extension for a result of Broersma, Kratsch and Woeginger [Fully decomposable split graphs, European J. Combin. 34 (2013) 567–575] on split graphs.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Remaining useful life prediction of a lithium-ion battery based on a temporal convolutional network with data extension
Autorzy:: Zhao, Jing
Liu, Dayong
Meng, Lingshuai
Tematy:: lithium ion battery
remaining useful life
adaptive noise
temporal convolutional network
bateria litowo jonowa
pozostały okres użytkowania
sieć konwolucyjna; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/59123836.pdf Link otwiera się w nowym oknie
Opis:: Unmanned underwater vehicles are typically deployed in deep sea environments, which present unique working conditions. Lithium-ion power batteries are crucial for powering underwater vehicles, and it is vital to accurately predict their remaining useful life (RUL) to maintain system reliability and safety. We propose a residual life prediction model framework based on complete ensemble empirical mode decomposition with an adaptive noise-temporal convolutional net (CEEMDAN-TCN), which utilizes dilated causal convolutions to improve the model’s ability to capture local capacity regeneration and enhance the overall prediction accuracy. CEEMDAN is employed to denoise the data and prevent RUL prediction errors caused by local regeneration, and feature expansion is utilized to extend the temporal dimension of the original data. The NASA and CALCE battery capacity datasets are used as input to train the network framework. The output is the current predicted residual capacity, which is compared with the real residual battery capacity. The MAE, RMSE and RE are used as the evaluation indexes of the RUL prediction performance. The proposed network model is verified on the NASA and CACLE datasets. The evaluation results show that our method has better life prediction performance. At the same time, it is proved that both feature expansion and modal decomposition can improve the generalization ability of the model, which is very useful in industrial scenarios.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: New material of the trechnotherian mammal Lactodens from the Early Cretaceous Jehol Biota: Comparison with Origolestes and implications for mammal evolution
Autorzy:: Mao, Fangyuan
Liu, Cunyu
Meng, Jin
Tematy:: Mammalia
Symmetrodonta
Spalacotheriidae
Zhangheotheriidae
dental morphology
mandible
Cretaceous
Yixian Formation
middle ear; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:: https://bibliotekanauki.pl/articles/2216239.pdf Link otwiera się w nowym oknie
Opis:: A new specimen of Lactodens sheni, the only known spalacolestine from the Early Cretaceous Jehol Biota, is reported from the Jiufotang Formation, Liaoning, China. The description focuses on the dental and mandibular morphologies from both the new specimen and the holotype, particularly those that were unknown or poorly known from the holotype when the taxon was established. As revealed primarily by high-resolution computed tomography, morphologies and size gradient of the lower molars and detailed features of the mandibles, such as the masseteric foramen, can be unequivo- cally described. The dental and mandibular morphologies of Lactodens are compared with those of Origolestes lii, also from the Jehol Biota; these two taxa represent by far the best specimens in Spalacotheriidae and Zhangheotheriidae, respectively, and could be used as the representatives of their own groups in future higher-level phylogenetic analysis of mammals. The two taxa display considerable differences in dental and mandibular features, probably indicating a deeper split of spalacotheriids and zhangheotheriids than previously thought. Absence of the Meckelian groove in Lactodens, contrasting to the distinct one that holds a sizable Meckel’s cartilage in adult Origolestes, suggests an independent evolution of the definitive mammalian middle ear within “symmetrodontans”. The morphological gradient in the tooth row and association of the upper and lower dentitions from the same individual animal are also instructive for interpreting molar variations and evolution in “symmetrodontans” and mammals.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Review of Carbon Emission and Carbon Neutrality in the Life Cycle of Silk Products
Autorzy:: Liu, Shuyi
Liu, Hong
Meng, Yudong
Li, Qizheng
Wang, Laili
Tematy:: carbon footprint
carbon neutrality
silk product
life cycle; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Powiązania:: https://bibliotekanauki.pl/articles/2171952.pdf Link otwiera się w nowym oknie
Opis:: Silk is a distinctive and significant category of natural structural protein fiber. With a remarkable structure and versatility, silk has emerged as a topic of scientific study perennially because of its chemical, physical and biological properties. Meanwhile, in order to have an omnifaceted understanding of silk, the environmental performance of silk production is also worthy of attention. With the concern of global warming, efforts are increasingly focused on understanding and addressing carbon emission in the life cycle of silk products. However, the majority of current studies give priority to the carbon emission of either just one or a few stages of silk products’ life cycle, or to a specific type of silk product. On the basis of a review of literature on the life cycle assessment of silk products, this study presents a full-scale review of the quantification of the carbon emission and carbon neutrality of cocoon acquisition, industrial production of silk products, distribution, consumption, and recycling. The analysis revealed that the carbon sequestration by photosynthesis at the stage of cocoon acquisition could not be ignored. It is of importance to establish complete and unified system boundaries when quantifying carbon emissions in the industrial production of silk products. Reasonable models of washing times and washing modes are needed to assess carbon emissions in the domestic laundry of silk products. At the end of life phase of silk products, the positive impact on carbon emission in the phase of silk recycling is noteworthy. This study will help interested scholars, manufacturers and consumers to gain an in-depth understanding of the carbon emissions and carbon neutrality of silk products, and it is also of great value for exploring new production processes for reducing carbon emissions of silk products.
Dostawca treści:: Biblioteka Nauki

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