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Tytuł:
The 1/3rd subharmonic and 3rd superharmonic resonance of a shape memory alloy (SMA) laminated beam
Autorzy:
Zhang, Xia Hui
Gao, Ming
Hao, Ying
Powiązania:
https://bibliotekanauki.pl/articles/1839701.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
SMA laminated beam
subharmonic resonance
superharmonic resonance
transition set
Opis:
This paper examines the 1/3rd subharmonic resonance and the 3rd superharmonic resonance of simply-supported shape memory alloy (SMA) laminated beams. First, the dynamic equation for SMA laminated beams under transverse load is established using physical equations, force equilibrium conditions, the compatibility equation of deformation, and a constitutive model of SMA polynomial functions. Then, a differential equation for transverse vibration of the SMA laminated beams is derived by the Galerkin process assuming the boundary conditions for simply-supported beams. Next, the amplitude-frequency response equations for the 1/3rd subharmonic resonance and the 3rd superharmonic resonance of these beams are derived by an averaging method before their respective transition sets are calculated, and their amplitude-frequency response diagrams were plotted using singularity theory. The results show two different types of amplitude-frequency responses to nonlinear vibration under the 1/3rd subharmonic resonance and the 3rd superharmonic resonance: quasi-linear and hard characteristic. In the quasi-linear area, SMA thickness A does not make much difference to the response of the system, whereas in the hard-characteristics area, under the same excitation amplitude f, the resonance frequency increases with A. In the nonlinear area, SMA can obviously reduce vibration amplitude, but it is not obvious for the 1/3rd subharmonic resonance. The nonlinear solution of both the 1/3rd subharmonic resonance and 3rd superharmonic resonance are stable.
Źródło:
Journal of Theoretical and Applied Mechanics; 2021, 59, 1; 27-41
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the cleanliness of super clean coal prepared by water-only cyclone
Autorzy:
Liu, Peikun
Wang, Hui
Jiang, Lanyue
Zhang, Yuekan
Yang, Xinghua
Li, Xiaoyu
Li, Feng
Powiązania:
https://bibliotekanauki.pl/articles/24085799.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
cyclone separating
chemical deashing
super clean coal
surface characteristics
comparative study
Opis:
Maintaining clean and pristine nature is the key to the use of super clean coal (SCC) for coal-based materials or energy combustion. Herein, SCC is prepared by a new water-only cyclone method, and compared the surface characteristics with the SCC products obtained by conventional chemical deashing method. The results indicate that: FTIR analysis revealed that the chemical method changed the original functional group of coal; BET analysis revealed that the SCC products prepared by the water-only method maintained the micropore volume of the raw coal and yielded a uniform and concentrated distribution of pore sizes, however, the chemical method destroying the original pore structure in the coal; SEM-EDS analysis indicated that the surface of SCC particles that were deashed using the water-only cyclone method was smooth and neat, whereas those obtained using the chemical method were seriously corroded, had a rough surface, and the SCC particles were prone to acid residues and precipitates. This study opens an innovative, simple, and clean method for the preparation of SCC, which further expands and enhances the potential application value of SCC.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168129
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on characteristics of three-dimensional granular meso-reconstruction of coal gangue roadbed
Autorzy:
Fan, Xiang-Xi
Hui, Bing
Ma, Shi-Jie
Fu, Jian-Cun
Zhang, Wen-Jun
Meng, Ling-Xiao
Sun, Zhi
Powiązania:
https://bibliotekanauki.pl/articles/2086979.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
coal gangue roadbed
particle flow
mesoscopic reconstruction
particle breakage
Opis:
The dynamic evolution process of the coal gangue particles’ core retention phenomenon in the process of crushing under stress, the evolution law of grading and the corresponding microscopic mechanical characteristics after continuous particle crushing are analyzed. The meso-level which reveals deformation phenomena of granular materials under the action of external loads is highly complex. At the qualitative level, the static compaction process of coal gangue samples can be roughly divided into three stages: initial compaction stage, compaction and crushing stage, and crushing (compaction) stage. It is proved that the interaction of lateral confined unidirectional compression of granular materials is mainly compression.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 3; 361--374
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SCREENING THE SPECIFIC SUBSTRATES OF ADENYLATION DOMAIN FROM MARINE ACTINOMYCETES BY FLUORESCENCE QUENCHING AND ISOTHERMAL TITRATION CALORIMETRY
Autorzy:
LEI, MING
ZHAO, ZHIJUAN
LIU, KE
LIU, YANLI
ZHANG, HUI
WU, XUE
GONG, SIYING
MA, YANLING
ZHAO, HAOBIN
LIU, JINLIN
MIN, JINRONG
QI, CHAO
Powiązania:
https://bibliotekanauki.pl/articles/895432.pdf
Data publikacji:
2018-12-31
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
A domain
Aspartic acid
Fluorescence quenching (FQ)
Isothermal titration calorimetry (ITC)
Marine actinomycetes
static quenching
Opis:
Adenylation domain (A domain) is a model of non-ribosomal peptide synthetases (NRPs), responsible for binding and activating the substrates-amino acids. In this study, a pGEX-2T-sare0718 recombinant plasmid (the gene sare0718 was cloned from Salinispora arenicola CNS-205, S.arenicola CNS-205) was transformed and expressed as a protein GST-Sare0718. Fluorescence quenching (FQ) was conducted to investigate the binding of 20 common amino acids to GST-Sare0718, then isothermal titration calorimetry (ITC) also be used[changed]. The results of FQ revealed that intrinsic fluorescence of GST-Sare0718 is quenched steadily by addition of aspartic acid (Asp) and glutamine (Gln) through static quenching mechanism. The binding constants Ka are Asp (1.504×106 L/mol) ≥ Gln (1.468×105 L/mol). And there is one binding site on the protein GST-Sare0718. We confirmed Asp preference of GST-Sare0718 by ITC. Therefore, Asp is the specific substrate. In addition, the experimental data indicates that the prediction system, “the specificity-conferring code”, is not suitable for marine actinomycetes. So it is urgent to set up a special predictive system for marine actinomycetes.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 6; 1287-1292
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on peripheral clamping of large-aperture laser transport mirror
Autorzy:
Cao, Tingfen
Liu, Bowu
Wang, Hui
Ni, Wei
Zhang, Jinli
Chen, Xiaojuan
Li, Yingang
Zhou, Hai
Jiang, Xiaodong
Hu, Dongxia
Zhu, Qihua
Powiązania:
https://bibliotekanauki.pl/articles/27310087.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
transport mirror
peripheral clamping
surface distortion
assembly structure
Opis:
This article introduces the study of peripheral clamping for large-aperture laser mirrors in high power laser facilities. Some multi-point clamping schemes were experimentally tested, the results of the experiments show that these schemes cannot meet the technical requirements, and in the simulation analysis, we explain the reason for this phenomenon. It is concluded that the additional bending moment caused by the non-ideal process factors in the multi-point clamping is the main cause for the surface distortion. Based on the above conclusions, we carried out research on minor-point clamping. Experimental verification of the minor-point clamping were done, the results show that the minor-point clamping can meet the requirements of technical indicators in whole process. This work can provide a reference for the design of the large-aperture transport mirror clamping structure, which may be used in huge laser devices and telescopes.
Źródło:
Optica Applicata; 2023, 53, 2; 227--238
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on new process for separation of silicon wafers and glass from decommissioned photovoltaic module
Autorzy:
Zhang, Jian wen
Wang, Hai dong
Zhang, Sheng guang
Liang, Han
Guo, Hui
Tao, Si-yao
Powiązania:
https://bibliotekanauki.pl/articles/2175425.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
crystalline silicon photovoltaic modules
decommissioned photovoltaic modules
silicon
solar cell
tempered glass
vibration separation
Opis:
In view of the disadvantages of the existing electrostatic separation process of decommissioned photovoltaic modules, which can only achieve the separation of fine silicon wafers and glass and has high energy consumption, a new process to solve the efficient dry separation of coarse silicon wafers and glass in decommissioned photovoltaic modules is proposed- the vibration separation method. Based on the theoretical analysis of the vibration separation of flaky silicon wafer and polyhedral glass particles, the effects of feed size, feed amount, vibration voltage, vibration frequency, horizontal inclination angle and longitudinal inclination angle on the product indexes of wafer and glass separation were investigated by single factor experiment. The optimal experimental conditions were obtained as follows: feed particle size +0.83mm, feed amount 0.15 t/h, vibration voltage 190 V, vibration frequency 48 Hz, horizontal inclination Angle 8°, longitudinal inclination Angle 3°. Under this optimized condition, the content of metal Si in the obtained silicon wafer product is 84.47%, the recovery rate of is 83.73%, the content of impurity SiO2 is 1.09%, and the content of SiO2 in the obtained glass product is 65.69%, and the recovery rate is 98.95%, the impurity metal Si content is 0.56%. This study provides a research idea for the industrial separation of silicon wafers and glass from decommissioned photovoltaic modules.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 151679
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on combustion mode of methanol micro-reciprocating piston internal combustion engine
Autorzy:
Tang, Gang Zhi
Wang, Shuai Bin
Zhang, Li
Shang, Hui Chao
Powiązania:
https://bibliotekanauki.pl/articles/329276.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
micro-energy power systems
combustion diagnosis
combustion model
methanol
silnik spalinowy
diagnostyka spalania
model spalania
metanol
Opis:
Constrained by the micro-space structure, it is proposed to use platinum wire incandescent ignition combustion mode to achieve the operation of internal combustion engine. However, the combustion test of the platinum wire incandescent ignition in miniature piston internal combustion engine shows: the combustion mode of micro-space platinum wire incandescent ignition has a poor combustion characteristic, low heat release rate, long combustion duration, and low combustion pressure. Therefore, a homogenous charge compression ignition mode is proposed to realize the operation of miniature internal combustion engine. However, it is found that the compression combustion cannot be come true in the cold start-up state of the micro engine. And the compression combustion in the first cycle was realized by the way of increasing the temperature of the cylinder block and platinum wire appropriately. The results show that: The maximum heat release rate is obviously improved and the combustion duration shortened by 28.6ºCA, and pmi increased by 76%. So, a novel hybrid combustion mode of in-cylinder compression combustion supported by the platinum wire incandescent ignition is put forward, through the way of adjusting the temperature of platinum wire, and this combustion mode is regarded as the ideal combustion mode of micro reciprocating piston internal combustion engine.
Źródło:
Diagnostyka; 2020, 21, 1; 97-103
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems and counter measures of arc suppression coilin 10 kV distribution system
Autorzy:
Ni, Hui
Ding, Pei
Ma, Yunlong
Ai, Shaogui
Ma, Feiyue
Zhang, Qingping
Powiązania:
https://bibliotekanauki.pl/articles/141485.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
arc suppression coil
capacitive current
artificial grounding fault test
neutral non-effective grounding system
Opis:
The arc suppression coil determines whether it can effectively extinguish the arc when it is grounded in the neutral non-effective grounding system. An artificial grounding test is an importantway to verify its performance. In this study, 13 substations with the 10 kV system in the Ningxia areawere selected and considered. Based on the artificial single-phase grounding test, the residual current, the compensation current and the off-resonance degree were measured in the arc suppression coil, and the performance of the arc suppression coil in the 10 kV system was verified. The experimental results show that the error of arc suppression coil automatic measurement is large, the off-resonance degree is large, the resistive component in the compensation current is excessive, the harmonic component exists in the compensating current and capacitive current. To solve these problems, this paper puts forward the corresponding countermeasures for reference.
Źródło:
Archives of Electrical Engineering; 2019, 68, 1; 135-146
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polymorphisms in the p53 pathway genes and micronucleus occurrence in Chinese vinyl chloride-exposed workers
Autorzy:
Li, Yong
Feng, Nan-Nan
Zhang, Guang-Hui
Wang, Qi
Hao, Yan-Hui
Nanzhang, Ya
Long, Changxu
Li, Yongliang
Brandt-Rauf, Paul W.
Xia, Zhao-Lin
Powiązania:
https://bibliotekanauki.pl/articles/2179059.pdf
Data publikacji:
2013-12-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
VC
occupational exposure
p53 pathway genes
genetic polymorphism
Opis:
Objectives: To investigate the association between polymorphisms in the p53 pathway genes and chromosomal damage in vinyl chloride (VC)-exposed workers. Materials and Methods: Cytokinesis block micronucleus test was performed in 310 VC-exposed workers and 149 non-exposed workers to determine chromosomal damage. The polymerase chain reaction and restriction fragment length polymorphism technique were used to detect six SNPs in the p53 pathway genes involved in the cell cycle. Results: There was a highly significant dose-response relationship between VC exposure and chromosomal damage. Individuals carrying the variant genotypes were at higher risk for chromosomal damage compared with their wild type genotype: p53rs1042522, MDM2 Del1518rs3730485, MDM2rs2279744 and GADD45Ars532446. On the other hand, individuals possessing the variant genotype of CDKN2A rs3088440 had significantly decreased risk compared with the corresponding wild-type. Conclusions: Genetic polymorphisms in P53 pathway genes may have an impact on VC-induced chromosomal damage.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2013, 26, 6; 825-836
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obraz Chin w eurazjatyckim projekcie Borisa Pilniaka: od wyobrażonego do dokumentarnego
The Image of China in the Eurasianist Ideal of Boris Pilnyak: From the Imaginary to the Documentary
Autorzy:
Zhang, Hui
Powiązania:
https://bibliotekanauki.pl/articles/1216974.pdf
Data publikacji:
2020-12-31
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Pilnyak
China
Eurasianism
The Naked Year
Sankt–Piter–Burkh
The Chinese Diary
Pilniak
Chiny
eurazjanizm
Nagi rok
Sankt-Piter-Burkh
Kitajskij dniewnik
Opis:
Artykuł omawia sposób przedstawiania i opisywania Chin w dziełach Borisa Pilniaka. Autor stawia tezę, iż twórczość fikcyjna i dzienniki podróżne Pilniaka reprezentują dwa podejścia w literackiej reprezentacji Chin: wyobrażone [imaginary] i dokumentarne [documentary]. Elementem łączącym owe podejścia jest fundamentalna dla pisarza wizja eurazjatycka, którą z jednej strony można postrzegać jako dziedzictwo uniwersalistycznej postawy rosyjskiej tradycji modernistycznej, a z drugiej jako odpowiedź na kryzys tożsamości narodowej, który wyrasta z ówczesnych realiów geopolitycznych. Wyobrażenia Pilniaka na temat Chin miały charakter produktu ubocznego wyobraźni poetyckiej w dziełach napisanych przed 1922 rokiem. Tam kontynuowany był palimpsestowy proces wpisywania mitu chińskiego w rosyjskie środowisko literackie, co przekładało się na utrwalenie pojęciowej internalizacji „Chin” w kształtującej się po swojemu Rosji. Przykładem jest obraz „Kitaj-gorodu” w powieści Nagi rok, który generował różne symboliczne znaczenia Chin. Od roku 1922 wariacje narracyjnej scenerii w prozie Pilniaka odzwierciedlały wpływ ówczesnych wydarzeń na obsesyjne myśli autora dotyczące historycznego związku Rosji i Azji. Wielkie znaczenie dla Pilniaka miała jego wyprawa do Chin w 1926 roku, której rezultatem jest Kitajskij dniewnik (Dziennik chiński). Państwo chińskie staje się tam punktem odniesienia rosyjskiej autorefleksji, socjopolitycznych i ideologicznych wahań. Łącząc wyobrażenie historii z komentarzem na temat rzeczywistości, Pilniak, w różnych sposobach przedstawiania Chin, pragnął zobrazować zmieniającą się tożsamość Rosji, zarówno z jej mitologizowanej przeszłości, jak z i uwydatnionej teraźniejszości.
This paper discusses the imagination and description of China in the works of Boris Pilnyak. It proposes that Pilnyak’s fictions and travelogues demonstrate two approaches to the literary representation of China: the imaginary and the documentary. What unifies these two approaches is the underlying Eurasianist vision of the author, which may be seen as a heritage of the universalist stance of Russian modernist tradition, on the one hand, and as a response to the national identity crisis that arose from the contemporary geopolitical circumstances on the other. The imagery of China served largely as a product of poetic imagination in Pilnyak’s works written before 1922, where it continued the palimpsestic inscription of the myth of China in the Russian literary milieu, perpetuating the conceptual internalization of “China” in the self–fashioning of Russia. An example of this is the image of “Kitai–gorod” in his novel The Naked Year, which generated different symbolic meanings of China. From 1922 on, the variations of narrative settings in Pilnyak’s prose reflected the impact of contemporary events in China on his ruminations on the historical relationship of Russia and Asia. Of seminal significance was his excursion to China in 1926, the product of which became The Chinese Diary, in which China figured as a point of reference for Russia in its self–reflection on socio–political and ideological fluctuations. Combining imagination of history and commentary on reality, Pilnyak’s various conceptions of China served to illuminate the shifting identity of Russia from both the mythologized past and the highlighted present.
Źródło:
Forum Poetyki; 2020, 22; 66-85
2451-1404
Pojawia się w:
Forum Poetyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanoslotted microring resonator for high figure of merit refractive index sensing
Autorzy:
Yang, Daquan
Duan, Bing
Zhang, Xuan
Lu, Hui
Powiązania:
https://bibliotekanauki.pl/articles/174324.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nanoslot
microring resonator
refractive index sensor
figure of merit
integrated nanophotonics
3D-FDTD
Opis:
A nanoslotted microring resonator (NSMR) with enhanced light-matter interaction has been designed, which can be used for high sensitive refractive index sensing. The performance of the device is investigated theoretically based on a three-dimensional finite-difference time-domain (3D-FDTD) method. In order to achieve high figure of merit sensing, the nanoslot geometry is exploited to make the optical field strongly localized inside the low index region and overlap sufficiently with the analytes. By using the 3D-FDTD method, the proposed NSMR sensor device achieves a high Q-factor (Q > 105) and sensitivity ~100 nm/RIU (RIU – refractive index unit). Moreover, the strong light confinement introduced by the nanoslot in NSMR results in the sensor figure of merit as high as 6.73 × 103. Thus, the design we proposed is a promising platform for refractive index-based biochemical sensing and lab-on-a-chip applications.
Źródło:
Optica Applicata; 2020, 50, 1; 37-47
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Insight into the Catalytic Mechanism of MFe2O4 (M = Ni, Zn and Co) on the Thermal Decomposition of TKX-50
Autorzy:
Hou, Xiaoting
Zhang, Ming
Zhao, Fengqi
Yang, Yanjing
An, Ting
Li, Hui
Pan, Qing
Wang, Xiaohong
Zhang, Kun
Powiązania:
https://bibliotekanauki.pl/articles/27788010.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
bimetallic iron oxide
thermal decomposition
TKX-50
catalysis
mechanism
Opis:
Synthesized dihydroxylammonium 5,5’-bistetrazole-1,1’-diolate (TKX-50) owes its outstanding application prospects in the field of insensitive solid propellants not only to its high energetic performance but also to its low mechanical sensitivity. Based on the excellent catalytic activity of bimetallic iron oxides for the thermal decomposition of TKX-50, the catalytic mechanism of bimetallic iron oxides (NiFe2O4, ZnFe2O4 and CoFe2O4) for TKX-50 pyrolysis has been explored. For this study, the decomposition process of TKX-50, before and after mixing with the bimetallic iron oxides NiFe2O4, ZnFe2O4 and CoFe2O4 was monitored by in-situ FTIR and gas-phase MS-FTIR instruments. Of the different catalysts, ZnFe2O4 gave the best result for reducing the initial decomposition temperature of TKX-50. Additionally, the activation energy of functional group cleavage of TKX-50, before and after mixing with ZnFe2O4, was also calculated for mechanism analysis from the results of the in-situ FTIR measurements. The results showed that the condensate and the gas-phase decomposition products of TKX-50 remained unchanged after mixing with different catalysts, while the activation energy of tetrazole ring cleavage was significantly reduced. The results of this study will be helpful for the rational design of insensitive solid propellant formulations containing TKX-50, and for understanding the pyrolysis mechanisms of TKX-50 before and after mixing with the efficient catalyst ZnFe2O4.
Źródło:
Central European Journal of Energetic Materials; 2021, 18, 2; 223--244
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Erdős-Gallai-Type Results for Total Monochromatic Connection of Graphs
Autorzy:
Jiang, Hui
Li, Xueliang
Zhang, Yingying
Powiązania:
https://bibliotekanauki.pl/articles/31343240.pdf
Data publikacji:
2019-11-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
total-colored graph
total monochromatic connection
Erdős- Gallai-type problem
Opis:
A graph is said to be total-colored if all the edges and the vertices of the graph are colored. A total-coloring of a graph is a total monochromatically-connecting coloring (TMC-coloring, for short) if any two vertices of the graph are connected by a path whose edges and internal vertices have the same color. For a connected graph G, the total monochromatic connection number, denoted by tmc(G), is defined as the maximum number of colors used in a TMC-coloring of G. In this paper, we study two kinds of Erdős-Gallai-type problems for tmc(G) and completely solve them.
Źródło:
Discussiones Mathematicae Graph Theory; 2019, 39, 4; 775-785
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elevated-temperature tensile deformation and fracture behavior of particle-reinforced PM 8009Al matrix composite
Autorzy:
Chen, Shuang
Chen, Guoqiang
Gao, Pingping
Liu, Chunxuan
Wu, Anru
Dong, Lijun
Huang, Zhonghua
Ouyang, Chun
Zhang, Hui
Powiązania:
https://bibliotekanauki.pl/articles/2173538.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum matrix composite
aluminum alloy 8009
elevated-temperature tensile property
interface
fracture behavior
kompozyt z osnową aluminiową
stop aluminium 8009
właściwość rozciągania w podwyższonej temperaturze
zachowanie pęknięć
Opis:
Tensile tests of 8009Al alloy reinforced with SiC and Al₂O₃ particles fabricated by powder metallurgy (PM) were conducted at temperatures of 250–350°C and strain rates of 0.001–0.1 s⁻¹. The ultimate tensile strength and yield strength of the samples decreased while the temperature and strain rate increased. The elongation slightly decreased at first and then increased with growing temperature because of the medium-temperature brittleness of the alloy matrix. When the strain rate was 0.1 s⁻¹, the elongation of the 8009Al/Al₂O₃ composites always decreased with an increase in temperature because of the poorly coordinated deformation and weak bonding between the matrix and Al₂O₃ particles at such a high strain rate. The work-hardening rates of the composites sharply increased to maxima and then decreased rapidly as the strain increased. Meanwhile, the 8009Al/SiCₚ composites displayed superior UTS, YS, elongation, and work-hardening rates than those of the 8009Al/Al₂O₃ composites under the same conditions. Compared to 8009Al alloys reinforced with spherical Al₂O₃ particle, 8009Al alloys reinforced with irregular SiC particles exhibited a better strengthening effect. The fracture mechanism of the 8009Al/SiCₚ composites was mainly ductile, while that of the 8009Al/Al₂O₃ composites was primarily debonding at the matrix–particle interfaces in a brittle mode.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e138846, 1--8
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 24

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