Autor: Wang, Mei - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Preparation of magnesium hydroxide by modifier-directed hydration and its effect on flame retardancy and mechanical properties of polypropylene
Autorzy:: Wang, Mei Jia
Bai, Li Mei
Zhang, Meng Ting
Ma, Yu Xin
Zhao, Liu Cheng
Li, Shao Ying
Tematy:: modifier
hydration preparation
magnesium hydroxide
polypropylene; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/27323651.pdf Link otwiera się w nowym oknie
Opis:: With the rapid development of the polymer materials industry and the improvement of people's environmental awareness, magnesium hydroxide has been widely used in polymer materials due to its high decomposition temperature, non-toxic smoke suppression, and the advantages of neutralizing harmful gases produced by polymer combustion. However, the conventional preparation methods of magnesium hydroxide exhibit several issues, including high hydrophilicity, elevated polarity, and limited compatibility with polymers. This research proposes an improved method by adding sodium stearate and KH560 modifier, controlling the rate of magnesium oxide and preparing magnesium hydroxide flame retardants using a modifier-directed hydration method. Various characterizations confirmed its morphology, particle size and structure. The magnesium hydroxide exhibits low polarity, small particle size, stable structure and excellent hydrophobicity (with a contact angle of 120.32°, and a free energy of 1.34mN/m). In parallel, the magnesium hydroxide/polypropylene composites demonstrate excellent flame retardancy (LOI of 25%, V-1 grade) and simultaneously enhance the dispersion of magnesium hydroxide within the polypropylene matrix, improving the material's toughness and strength.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effects of Welding Heat Input on Microstructure and Corrosion Characterization in CGHAZ of X80 Pipeline Steel
Autorzy:: Wang, Xue-Mei
Zhao, Wei
Chen, Kai
Li, Zhen
Tematy:: X80 pipeline steel
coarse grain heat-affected zone
heat input
corrosion; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/28099607.pdf Link otwiera się w nowym oknie
Opis:: The coarse-grained heat-affected zone specimens of X80 pipeline steel were produced by welding thermal simulation under different heat inputs of 10, 30, and 55 kJ/cm to study the effects of heat input on microstructure evolution and corrosion characterization. The corrosion resistance of coarse-grained heat-affected zones was poorer than that of base metal due to less homogenous in the former. For 10 kJ/cm coarse-grained heat-affected zone, the corrosion resistance was poorer than the others due to the more adsorption hydrogen around the needle-like martensite/austenite constituents and greater galvanic driving force between the needle-like martensite/austenite constituents and ferrite. In carbonate/bicarbonate solution, better corrosion resistance for coarse-grained heat-affected zones was obtained when the heat input is 30 kJ/cm, which can be attributed to the severe coarse martensite/austenite constituents for 55 kJ/cm coarse-grained heat-affected zone. In the H2S environment, the better corrosion resistance for coarse-grained heat-affected zone was obtained when the heat input is 55 kJ/cm, which can be attributed to the protective effect of corrosion products. In addition, the high content of M/A constituents for 30 kJ/cm CGHAZ was good for hydrogen adsorption, which was adverse to the corrosion resistance in acid environments.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Beyond the "Code" : a Guide to the description and documentation of biodiversity in ciliated protists (Alveolata, Ciliophora)
Autorzy:: Shao, Chen
Lipscomb, Diana
Al-Farraj, Saleh A.
Luporini, Pierangelo
Gupta, Renu
Pérez-Uz, Blanca
Aescht, Erna
Agatha, Sabine
Clamp, John C.
Wiąckowski, Krzysztof
Kamra, Komal
Odhiambo Ong'ondo, Geoffrey
Martín-Cereceda, Mercedes
Xu, Kuidong
Makhija, Seema
Day, John G.
Carr, Martin
Warren, Alan
Rotterová, Johana
Ma, Honggang
Lin, Xiaofeng
Wu, Lei
Montagnes, David J. S.
Gao, Shan
Wang, Mei
Yi, Zhenzhen
Fan, Yangbo
Patterson, David J.
Macek, Miroslav
Quintela-Alonso, Pablo
Al-Rasheid, Khaled
Nikolaeva, Svetlana
Purushothaman, Jasmine
Dunthorn, Micah
Langlois, Gaytha
Lynn, Denis H.
Song, Weibo
McMiller, Nettie
Vallesi, Adriana
Shi, Xinlu
El-Serehy, Hamed A.
Dellinger, Marc
Mansergh, Robert I.
Al-Quraishy, Saleh
Stoeck, Thorsten
Hu, Xiaozhong
Weisse, Thomas
La Terza, Antonietta
Lobban, Christopher S.
Shen, Zhuo
Achilles-Day, Undine E. M.
Mackenzie-Dodds, Jacqueline
Gong, Jun
Zufall, Rebecca
Santoferrara, Luciana
Gao, Feng
Opis:: Recent advances in molecular technology have revolutionized research on all aspects of the biology of organisms, including ciliates, and created unprecedented opportunities for pursuing a more integrative approach to investigations of biodiversity. However, this goal is complicated by large gaps and inconsistencies that still exist in the foundation of basic information about biodiversity of ciliates. The present paper reviews issues relating to the taxonomy of ciliates and presents specific recommendations for best practice in the observation and documentation of their biodiversity. This effort stems from a workshop that explored ways to implement six Grand Challenges proposed by the International Research Coordination Network for Biodiversity of Ciliates (IRCN-BC). As part of its commitment to strengthening the knowledge base that supports research on biodiversity of ciliates, the IRCN-BC proposes to populate "The Ciliate Guide", an online database, with biodiversity-related data and metadata to create a resource that will facilitate accurate taxonomic identifications and promote sharing of data.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 4.

Tytuł:: Infrasound Signal Classification Based on ICA and SVM
Autorzy:: Lu, Quanbo
Wang, Meng
Li, Mei
Tematy:: independent component analysis
fast Fourier transform
support vector machine
infrasound signal; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/31339863.pdf Link otwiera się w nowym oknie
Opis:: A diagnostic technique based on independent component analysis (ICA), fast Fourier transform (FFT), and support vector machine (SVM) is suggested for effectively extracting signal features in infrasound signal monitoring. Firstly, ICA is proposed to separate the source signals of mixed infrasound sources. Secondly, FFT is used to obtain the feature vectors of infrasound signals. Finally, SVM is used to classify the extracted feature vectors. The approach integrates the advantages of ICA in signal separation and FFT to extract the feature vectors. An experiment is conducted to verify the benefits of the proposed approach. The experiment results demonstrate that the classification accuracy is above 98.52% and the run time is only 2.1 seconds. Therefore, the proposed strategy is beneficial in enhancing geophysical monitoring performance.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Bounding the Locating-Total Domination Number of a Tree in Terms of Its Annihilation Number
Autorzy:: Ning, Wenjie
Lu, Mei
Wang, Kun
Tematy:: total domination
locating-total domination
annihilation num- ber
tree; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:: https://bibliotekanauki.pl/articles/31343731.pdf Link otwiera się w nowym oknie
Opis:: Suppose $ G = (V,E) $ is a graph with no isolated vertex. A subset $ S $ of $ V $ is called a locating-total dominating set of $ G $ if every vertex in $ V $ is adjacent to a vertex in $ S $, and for every pair of distinct vertices $ u $ and $ v $ in $ V − S $, we have $ N(u) \cap S \ne N(v) \cap S $. The locating-total domination number of $G$, denoted by $ \gamma_t^L (G) $, is the minimum cardinality of a locating-total dominating set of $G$. The annihilation number of $G$, denoted by $a(G)$, is the largest integer $k$ such that the sum of the first $k$ terms of the nondecreasing degree sequence of $G$ is at most the number of edges in $G$. In this paper, we show that for any tree of order $ n \ge 2$, $ \gamma_t^L (T) \le a(T) + 1 $ and we characterize the trees achieving this bound.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Bounds on the Locating-Total Domination Number in Trees
Autorzy:: Wang, Kun
Ning, Wenjie
Lu, Mei
Tematy:: tree
total dominating set
locating-total dominating set
locating-total domination number; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:: https://bibliotekanauki.pl/articles/31867549.pdf Link otwiera się w nowym oknie
Opis:: Given a graph $G = (V, E)$ with no isolated vertex, a subset $S$ of $V$ is called a total dominating set of $G$ if every vertex in $V$ has a neighbor in $S$. A total dominating set $S$ is called a locating-total dominating set if for each pair of distinct vertices $u$ and $v$ in $V \ S, N(u) ∩ S ≠ N(v) ∩ S$. The minimum cardinality of a locating-total dominating set of $G$ is the locating-total domination number, denoted by $γ_t^L(G)$. We show that, for a tree $T$ of order $n ≥ 3$ and diameter $d$, $\frac{d+1}{2}≤γ_t^L(T)≤n−\frac{d−1}{2}$, and if $T$ has $l$ leaves, $s$ support vertices and $s_1$ strong support vertices, then $γ_t^L(T)≥max\Big\{\frac{n+l−s+1}{2}−\frac{s+s_1}{4},\frac{2(n+1)+3(l−s)−s_1}{5}\Big\}$. We also characterize the extremal trees achieving these bounds.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Conformal Invariance and Conserved Quantities for Lagrange Equation of Thin Elastic Rod
Autorzy:: Wang, Peng
Feng, Hui-Rong
Lou, Zhi-Mei
Tematy:: conformal invariance
Lie symmetry
conserved quantities
thin elastic rod
Lagrange equation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1033429.pdf Link otwiera się w nowym oknie
Opis:: Basing on the analytical mechanics methods, the Lagrangian equations of thin elastic rod is constructed. The definition of conformal invariance for the Lagrange mechanics of elastic rod is given. The criterions that conformal invariance of elastic rod is the Lie symmetry are obtained based on the Lie point transformation group. The structure equation and conserved quantity deduced from conformal invariance of elastic rod are constructed. Take twist rod as an example to illustrate the application of the results got in this paper.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Research on the linear viscoelastic rheological properties of rejuvenated asphalt mastic based on the discrete element method
Autorzy:: Lin, Mei
Lei, Yu
Li, Ping
Shuai, Jun
Wang, Zhaoli
Tematy:: model konstytutywny
metoda elementów dyskretnych
mastyks asfaltowy odnowiony
właściwości reologiczne
constitutive model
discrete element method
rejuvenated asphalt mastic
rheological characteristics; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/27312105.pdf Link otwiera się w nowym oknie
Opis:: The rheological property of asphalt is an important factor affecting the pavement performance of asphalt binder, and the fundamental reason for the change of asphalt rheological property is the strong evolution of asphalt material meso structure. However, the internal mechanism of rejuvenated asphalt mastic system is complex and its rules are difficult to grasp. Aiming to study the relationship between meso mechanical parameters and rheological parameters of rejuvenated asphalt mastic, the meso structure model of rejuvenated asphalt mastic was established and improved based on the discrete element method. Moreover, the meso parameters of the model were obtained by the objective function method, and then the influences of various factors were studied to construct the mathematical constitutive model of rheological parameter modulus and meso mechanical parameters. Combing with the reliability of the improved Burgers model was verified based on the rheological test results of rejuvenated asphalt mastic. In addition, the virtual test of dynamic shear rheological dynamic frequency scanning was carried out on the asphalt mastic sample by particle flow software. By adjusting the mesomechanical parameters, the simulation results (complex shear modulus and phase angle) were consistent with the test results. This study clarified the relationship between mesomechanics and macro performance, and this model could be used to obtain the complex shear modulus of rejuvenated asphalt mastic under different types, filler-asphalt ratio and external force environments by adjusting particle flow, wall boundary and other conditions, which can greatly save the workload for the later research and provide a theoretical basis for production experiments.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Modified right heart contrast echocardiography versus traditional method in diagnosis of right-to-left shunt : a comparative study
Autorzy:: Yin, Lixue
Zhang, Mei
Zeng, Jie
Wang, Yi
Hou, Dailun
Opis:: BACKGROUND: The purpose of this study was to evaluate the reliability, effectiveness, and safety of modified right heart contrast transthoracic echocardiography (cTTE) in comparison with the traditional method. MATERIAL AND METHODS: We performed a modified right heart cTTE using saline mixed with a small sample of patient's own blood. Samples were agitated with varying intensity. This study protocol involved microscopic analysis and patient evaluation. 1. Microscopic analysis: After two contrast samples had been agitated 10 or 20 times, they underwent a comparison of bubble size, bubble number, and red blood cell morphology. 2. Patient analysis: 40 patients with suspected RLS (right- to-left shunt) were enrolled. All patients underwent right heart contrast echocardiography. Oxygen saturation, transit time and duration, presence of RLS, change in indirect bilirubin and urobilinogen concentrations were compared afterward. RESULTS: Modified method generated more bubbles (P<0.05), but the differences in bubble size were not significant (P>0.05). Twenty-four patients were diagnosed with RLS (60%) using the modified method compared to 16 patients (40%) with the traditional method. The transit time of ASb20 group was the shortest (P<0.05). However, the duration time in this group was much longer (P<0.05). Also, in semi-quantitative analysis mean rank of RLS was higher after injecting the modified contrast agent agitated 20 times (P<0.05). CONCLUSIONS: Modified right heart contrast echocardiography is a reliable, effective and safe method of detecting cardiovascular RLS.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 10.

Tytuł:: Characteristic of carbon dioxide absorption by cereals in Poland and China
Charakterystyka absorbcji dwutlenku węgla przez zboża w Polsce i Chinach
Autorzy:: Pawłowski, Lucjan
Pawłowska, Małgorzata
Cel, Wojciech
Wang, Lei
Li, Chong
Mei, Tingting
Tematy:: climate change
carbon dioxide emission
terrestrial ecosystem
carbon dioxide sequestration
photosynthesis
zmiana klimatu
emisja dwutlenku węgla
ekosystem lądowy
sekwestracja dwutlenku węgla
fotosynteza; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Powiązania:: https://bibliotekanauki.pl/articles/215903.pdf Link otwiera się w nowym oknie
Opis:: The reports of Intergovernmental Panel for Climate Change indicate that the growing emission of greenhouse gases, produced from the combustion of fossil fuels, mainly carbon dioxide, leads to negative climate changes. Therefore, the methods of mitigating the greenhouse gases emission to the atmosphere, especially of carbon dioxide, are being sought. Numerous studies are focused on so-called geological sequestration, i.e. injecting carbon dioxide to appropriate geological strata or ocean waters. One of the methods, which are not fully utilized, is the application of appropriate techniques in agriculture. The plant production in agriculture is based on the absorption of carbon dioxide in the photosynthesis process. Increasing the plant production directly leads to the absorption of carbon dioxide. Therefore, investigation of carbon dioxide absorption by particular crops is a key issue. In Poland, ca. 7.6 mln ha of cereals is cultivated, including: rye, wheat, triticale, oat and barley. These plants absorb approximately 23.8 mln t C annually, including 9.8 mln t C/yr in grains, 9.4 mln t C/yr in straw and 4.7 mln t C/yr in roots. The China, these cereals are cultivated on the area over 24 mln ha and absorb 98.9 mln t C/yr, including 55 mln tC/yr in grains, 36 in straw, and 7.9 mln t C/yr in roots. The second direction for mitigating the carbon dioxide emission into the atmosphere involves substituting fossil fuels with renewable energy sources to deliver primary energy. Cultivation of winter cereals as cover crops may lead to the enhancement of carbon dioxide removal from the atmosphere in the course of their growth. Moreover, the produced biomass can be used for energy generation.
Z raportów Międzynarodowego Zespołu ds. Zmian Klimatu (IPCC) wynika, że rosnąca emisja gazów cieplarnianych, głównie dwutlenku węgla pochodzącego ze spalania paliw kopalnych, prowadzi do negatywnych zmian klimatu. Wobec takiego zagrożenia poszukuje się metod prowadzących do ograniczenia emisji do atmosfery gazów cieplarnianych, w szczególności dwutlenku węgla. Badania nad ograniczeniem emisji dwutlenku węgla koncentrują się głównie nad tzw. sekwestracją geologiczną, czyli zatłaczaniem dwutlenku węgla do odpowiednich pokładów geologicznych lub wód oceanicznych. Jednym ze sposobów, nie w pełni wykorzystanych, jest stosowanie odpowiednich technik w rolnictwie. Roślinna produkcja w rolnictwie oparta jest na absorpcji dwutlenku węgla w procesie fotosyntezy. Zwiększenie produkcji roślinnej prowadzi bezpośrednio do wzrostu absorpcji dwutlenku węgla. Dlatego ważnym zagadnieniem jest poznanie absorpcji dwutlenku węgla przez poszczególne uprawy. W Polsce na obszarze o powierzchni 7,6 mln ha uprawia się zboża: żyto, pszenicę, pszenżyto, owies i jęczmień. Rośliny te absorbują rocznie około 23,8 mln t C, z tego 9,8 mln t C/rok w ziarnach, 9,4 mln t C/rok w słomie i 4,7 mln t C/rok w korzeniach. W Chinach zboża te uprawiane są na powierzchni przekraczającej 24 mln ha i absorbują 98,9 mln t C/rok, z tego w ziarnach 55 mln t C/rok, w słomie 36 mln t C/rok, a 7,9 mln t C/rok w korzeniach. Drugim kierunkiem ograniczania emisji dwutlenku węgla do atmosfery jest zastępowanie paliw kopalnych, stanowiących źródło energii pierwotnej, przez odnawialne źródła energii. Uprawa zbóż ozimych jako roślin okrywowych może prowadzić do intensyfikacji usuwania dwutlenku węgla z atmosfery. Ponadto wyprodukowana biomasa może być wykorzystana jako surowiec do produkcji energii.
Dostawca treści:: Biblioteka Nauki

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