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Tytuł:
Experimental study on SHPB cyclic impact of rubber-cement composite with different confine modes
Autorzy:
Yang, Rongzhou
Xu, Ying
Chen, Peiyuan
Cheng, Lin
Ding, Jinfu
Fu, Hongxin
Powiązania:
https://bibliotekanauki.pl/articles/27312124.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
dzielony pręt Hopkinsona
polimer wzmocniony włóknem węglowym
kompozyt gumowo-cementowy
oddziaływanie cykliczne
energia pękania
uszkodzenie
odporność na uderzenia
split Hopkinson pressure bar
carbon fibre reinforced polymer
rubber-cement composite
cyclic impact
damage
fracture energy
impact resistance
Opis:
To promote the application of rubber-cement composites as the main bearing structure and key components in practical engineering under frequent dynamic disturbances, in this work, the split Hopkinson pressure bar (SHPB) cyclic impact tests of rubber-cement composite specimens with four different confine modes were carried out in which the impact load increased sequentially. The relationship between average strain rate, ultimate strain and impact times and the relationship between peak stress, damage energy, ultimate strain and incident energy were analyzed. The results showed that the appropriate confine reinforcement treatment can make rubber-cement composite give full play to its deformation ability when it was completely damaged. Carbon fiber-reinforced polymer (CFRP) sheet and steel cylinder can work together with the rubber-cement composite matrix to resist impact load, which effectively improves the structural strength, damage fracture energy, and cyclic impact resistance of the rubber-cement composite. Finally, based on the effect difference of confine modes, the simplified plane force models of rubber-cement composite specimens with four different confine modes were established, which clearly revealed the completely different impact resistance mechanism of the rubber-cement composites with different constraints under cyclic impact loading.
Źródło:
Archives of Civil Engineering; 2023, 69, 2; 517--534
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Convolution operators on Hardy spaces
Autorzy:
Lin, Chin-Cheng
Powiązania:
https://bibliotekanauki.pl/articles/1287377.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
atomic decomposition
Hardy spaces
homogeneous groups
Opis:
We give sufficient conditions on the kernel K for the convolution operator Tf = K ∗ f to be bounded on Hardy spaces $H^p(G)$, where G is a homogeneous group.
Źródło:
Studia Mathematica; 1996, 120, 1; 53-59
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is Chinas Textile Industry Still a Labour-Intensive Industry?
Czy chiński przemysł tekstylny nadal jest przemysłem pracochłonnym?
Autorzy:
Zhang, Jianlei
He, Lin
Cheng, Longdi
Powiązania:
https://bibliotekanauki.pl/articles/1419851.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
textile industry
labour-intensive industry
factor intensity classification
capital-labour intensity
technology intensity
przemysł tekstylny
przemysł pracochłonny
klasyfikacja intensywności czynników
kapitałochłonność
intensywność technologii
Opis:
Is China's textile industry (CTI) still a laboor-intensive one? To answer this question, this study measures the capital-labour intensity and technology intensity of CTI and its subsectors during 2006-2018, then applies factor intensity classification and cluster analysis to identify their industrial attributes. The results show that CTI and its sub-sectors are still the labour- and non-technology-intensive. All the indexes of capital-labour intensity and technology intensity of CTI and its sub-sectors are below 100, lower than the average of industry sectors, indicating that they are not separate from the category of labour-intensive industry and still heavily dependent on labour. And cluster analysis verifies the industrial classification results. So CTI still needs to keep on increasing its capital intensity and technology intensity to achieve the goal of industrial transformation and upgrading in the future.
Czy chiński przemysł tekstylny nadal wymaga dużego nakładu pracy? Aby odpowiedzieć na to pytanie zbadano kapitałochłonność i intensywność technologiczną chińskiego przemysłu tekstylnego i jego podsektorów w latach 2006-2018, a następnie zastosowano klasyfikację intensywności czynników i analizę skupień w celu określenia ich atrybutów przemysłowych. Wyniki pokazały, że chiński przemysł tekstylny i jego podsektory nadal są pracochłonne i nie wymagają dużej ilości technologii. Wszystkie wskaźniki kapitałochłonności i technologiczno-pracochłonności chińskiego przemysłu tekstylnego i jego podsektorów kształtują się poniżej 100, czyli są niższe od średniej dla sektorów przemysłu, co wskazuje, że nie są one oddzielone od kategorii przemysłu pracochłonnego. Analiza skupień weryfikuje wyniki klasyfikacji przemysłowej. Chiński przemysł tekstylny nadal musi zwiększać swoją kapitałochłonność i intensywność technologii, aby osiągnąć cel, jakim jest transformacja przemysłowa i modernizacja w przyszłości.
Źródło:
Fibres & Textiles in Eastern Europe; 2021, 1 (145); 13-16
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Almost everywhere convergence of Laguerre series
Autorzy:
Chen, Chang-Pao
Lin, Chin-Cheng
Powiązania:
https://bibliotekanauki.pl/articles/1290468.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
almost everywhere convergence
Cesàro means
Laguerre polynomials
Riesz means
Opis:
Let $a ∈ ℤ^+$ and $f ∈ L^p (ℝ^+), 1 ≤ p ≤ ∞ $. Denote by $c_j$ the inner product of f and the Laguerre function $ℒ^a_j$. We prove that if ${c_j}$ satisfies $lim_{λ↓1} \overline lim_{n→∞} ∑_{n
Źródło:
Studia Mathematica; 1994, 109, 3; 291-301
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Night-shift work and risk of compromised visual acuity among the workers in an electronics manufacturing company
Autorzy:
Lin, Yu-Cheng
Ho, Kuo-Jung
Powiązania:
https://bibliotekanauki.pl/articles/2161802.pdf
Data publikacji:
2017-10-18
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
aging
occupational health
visual acuity
electronics manufacturing industry
health check-ups
night-shift work
Opis:
Objectives: To evaluate the association between night-shift work exposure and visual health, this cross-sectional study utilized visual acuity, a surrogate measure for visual function, as a parameter, and performed an analysis comparing visual acuity between daytime and nighttime employees in an electronics manufacturing company. Material and Methods: Data of personal histories, occupational records, physical examinations and blood tests was obtained from the electronic health records of workers. The total of 8280 workers including 3098 women and 5182 men, wearing their own daily used eyeglasses, were included in the final analysis. The mean age of the sample population was 34.7 years old (standard deviation = 5.4 years). All workers were divided into 3 work categories – consistent daytime worker (CDW), day-shift worker (DSW) and night-shift worker (NSW). The check-up results of glasses-corrected visual acuity (c-VA) were utilized to classify individuals as good (≥ 1.2, both eyes) and inadequate (< 0.8, the better eye) c-VA. Results: Consistent daytime workers had the highest rate of good c-VA (42.5% vs. 25.1% DSW and 21.1% NSW, p = 0.047). Night-shift workers had the highest rate of inadequate c-VA (CDW, DSW and NSW: 2.6%, 6.2%, and 7.6%, p = 0.03) among all employees. After controlling for covariates, NSW were found at an increased risk for inadequate c-VA (adjusted odds ratio (ORa) = 2.7, 95% confidence interval (CI): 2.0–3.6, vs. CDW), and less likely to have good c-VA (ORa = 0.4, 95% CI: 0.4–0.5, vs. CDW). Conclusions: Night-shift work is moderately associated with compromised visual acuity of employees in this electronics manufacturing company. Int J Occup Med Environ Health 2018;31(1):71–79
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2018, 31, 1; 71-79
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of antibacterial polyurethane film and its properties
Autorzy:
Lin, Zhao
Yunyun, Li
Bin, Cheng
Yu, Chen
Powiązania:
https://bibliotekanauki.pl/articles/779374.pdf
Data publikacji:
2020
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
polyurethane
Ag nanoparticles
antibacterial
composite film
Opis:
Polyurethane (PU) is a polymer widely used in the biomedical field with excellent mechanical properties and good biocompatibility. However, it usually exhibits poor antibacterial properties for practical applications. Efforts are needed to improve the antibacterial activities of PU films for broader application prospect and added application values. In the present work, two PU films, TDI-P(E-co-T) and TDI-N-100-P(E-co-T), were prepared. Silver nanoparticles (AgNPs) were composited into the TDI-N-100-P(E-co-T) film for better mechanical properties and antibacterial activities, and resultant PU/AgNPs composite film was systematically characterized and studied. The as-prepared PU/AgNPs composite film exhibits much better antibacterial properties than the traditional PU membrane, exhibiting broader application prospect.
Źródło:
Polish Journal of Chemical Technology; 2020, 22, 2; 50-55
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilizing the metabolic syndrome component count in workers’ health surveillance: An example of day-time vs. day-night rotating shift workers
Autorzy:
Lin, Yu Cheng
Hsieh, I-Chun
Chen, Pau-Chung
Powiązania:
https://bibliotekanauki.pl/articles/2177229.pdf
Data publikacji:
2015-07-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
metabolic syndrome
day-and-night rotating shift work
occupational health
physical examination
Opis:
Objectives To establish a practical method for assessing the general metabolic health conditions among different employee groups, this study utilized the total count of metabolic syndrome (MetS) elements as a parameter, and performed a retrospective analysis comparing changes of MetS component count (MSC) of 5 years among day-time work (DW) and day-andnight rotating shift work (RSW) employees. Material and Methods The data of personal histories, physical examinations, blood tests, abdominal sonographic examinations and occupational records were collected from a cohort of workers in an electronics manufacturing company. We first defined the arithmetic mean value of MSC as MSC density (MSCD) for the employee group; then we compared the changes of MSCD over 5 years between DW and RSW workers. Occupational, personal and health records were analyzed for the 1077 workers with an initial mean age of 32.4 years (standard deviation (SD): 6.2 years), including 565 RSW workers (52%). Results The initial MSCDs were 1.26 and 1.12 (p = 0.06) for DW and RSW workers, respectively; after 5 years, the increments of MSCD for DW and RSW workers were 0.10 and 0.39, respectively (p < 0.01). By performing multivariate logistic regression analyses, and comparing with DW co-workers, final results indicated that the workers exposed to RSW have 1.7-fold increased risk of elevated MSCD (95% confidence interval (CI): 1.28–2.25, p < 0.01); and are 38% less likely (adjusted rate ratio (aRR) 0.62, 95% CI: 0.45–0.86, p < 0.01) to attain decreased MSCD. Conclusions These observations demonstrate that changes of MSCD are significantly different between DW and RSW workers, and are increasingly associated with RSW exposure. In conclusion, MSCD can represent the general metabolic health conditions of a given employee group; MSC, MSCD and their transitional changes can be applied as simple and standardized tools for monitoring metabolic health risk profiles when managing employee health, at both the individual and company levels.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2015, 28, 4; 675-688
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of dam-break-like tsunami bore impact mechanism on a container model
Autorzy:
Chen, Cheng
Chen, Jun
Lin, Peng
Chen, Chiwei
Chen, Haozhe
Powiązania:
https://bibliotekanauki.pl/articles/260608.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
tsunami bore
dam break
container
Froude number
movement distance
coast slope
Opis:
Tsunami disasters have frequently occurred in recent years. More and more researchers are focusing on this topic. To investi-gate the tsunami bore impact mechanism on a container model, a multi-functional slope-changing tsunami flume is built in this study. To simulate a tsunami bore, a dam-break wave was generated by a free-falling gate in a reservoir. A needle water level gauge and a high-speed camera were used to measure the tsunami wave heights and velocities for different storage water levels in the test flume, and the corresponding Froude numbers of tsunami waves were also calculated. The factors af-fecting the movement distance of the tsunami wave impacting the container model are explored in this experiment, and the results show that the movement distance is positively correlated with the storage water level, and negatively correlated with the container density and the coast slope.
Źródło:
Polish Maritime Research; 2020, 1; 53-59
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transcriptomic analysis of different tissues in Korean arborvitae
Autorzy:
Mu, H.
Gao, Y.
Cheng, F.
Lin, L.
Wang, G.
Xia, F.
Powiązania:
https://bibliotekanauki.pl/articles/2077762.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Thuja koraiensis
transcriptome
tissue specific
Opis:
Korean arborvitae (Thuja koraiensis) is an evergreen shrub or small tree native to Korea and the extreme Changbai Mountain of China threatened by habitat loss. Due to the limited genomic sources of Ko- rean arborvitae, it is important to explore transcriptome to understand this economically important plant. We used RNA-seq technology to characterize the transcriptome of root, stem and leaf in Korean arborvitae, respectively. Based on the bioinformatics analysis of assembled transcriptome data, transcriptional path- ways and differentially expressed genes (DEGs) were identified. There were 152.26 million reads generated, and 446,568 unigenes with a mean size of 423.51 nt obtained via de novo assembly. Of these, 204,091 unigenes (45.70%) were further annotated by comparison to public protein databases. A total of 63,495 unigenes (14.22%) were associated into 130 pathways by searching against the KEGG database. DEGs analysis identified 11,890, 5,900 and 10,136 DEGs from the comparison of root vs. stem, root vs. leaf and stem vs. leaf, respectively. Besides, photosynthesis, plant hormone signal transduction and metabolism and biosynthesis of sugar and amino acids were changed in different tissues. We obtained 446,568 unigenes in Korean arborvitae and 11,890, 5,900 and 10,136 DEGs from the compar- ison of root vs. stem, root vs. leaf and stem vs. leaf, respectively. These results will aid in understanding and carrying out future studies on the molecular basis of Korean arborvitae and contribute to future artificial production and applications.
Źródło:
Dendrobiology; 2019, 81; 31-39
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 20

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