Autor: Su, Yang - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: The lagged effect of air pollution on human eosinophils: a distributed lag non-linear model
Autorzy:: Ding, Zhaojun
Xie, Zhen
Su, Yang
Qi, Jiying
Cui, Bin
Tematy:: air pollution
gender difference
eosinophils
real-world data
lagged effect
distributed lag non-linear model; Pokaż więcej
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Powiązania:: https://bibliotekanauki.pl/articles/2116610.pdf Link otwiera się w nowym oknie
Opis:: ObjectivesThe aim of this study was to determine the lag between exposure to air pollutants and changes in human eosinophil counts.Material and MethodsThis was a retrospective study employing 246 425 physical examination records dated December 2013 – December 2016 from Chengdu, China. The authors determined the prevalence of individuals with eosinophil counts above the normal reference range each day. A distributed lag non-linear model was used to evaluate the lagged effect of each air pollutant on eosinophil counts. The lagged effects of each air pollutant were counted and presented with smoothing splines.ResultsThe effects of air pollutants such as particulate matter (PM2.5, aerodynamic diameters <2.5 μm; PM10, aerodynamic diameters <10 μm), nitrogen dioxide (NO2) and ozone (O3) were evaluated. In women, the effects of PM2.5 (RR = 1.154, 95% CI: 1.061–1.255) and PM10 (RR = 1.309, 95% CI: 1.130–1.517) reached the maximum values on lag day 0. In men, there was no significant effect of PM2.5, but significant effects of PM10 were found for lag days 20–28. The effects of NO2 and O3 on eosinophils were not statistically significant for either gender.ConclusionsThe air pollutants of PM10 have a significant effect on human eosinophils for both women and men, but with different temporal patterns, with women showing a lag of 0–5 days and men showing a lag of 20–28 days. In addition, PM2.5 was significant for women with a lag of 0–3 days but it was not significant for men.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Biomechanical simulation of needle insertion into cornea based on distortion energy failure criterion
Autorzy:: Su, P.
Yang, Y.
Huang, L.
Tematy:: rogówka
biomechanika
symulacja matematyczna
cornea
biomechanics
insertion force
suture
mathematical simulation; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/306549.pdf Link otwiera się w nowym oknie
Opis:: Purpose: This paper is mainly about biomechanical behavior of needle insertion into cornea, and proposes a failure criterion to simulate the insertion process which has attracted considerable attention due to its importance for the minimally invasive treatment. Methods: In the process of needle insertion into cornea, tiny and complex insertion force is generated due to contact between needle and soft tissue. Based on the distortion energy theory, there is proposed a failure criterion of corneal material that can solve contact problem between rigid body and biological tissue in insertion simulation, where Cauchy stress of corneal material is the key to numerical calculation. A finite element model of in vivo cornea is built, and the cornea constrained by sclera is simplified to two layers containing epithelium and stroma. Considering the hyper-viscoelastic property of corneal material, insertion simulation is carried out. Results: By insertion experiment, the insertion force increases with insertion depth accompanying obvious fluctuations. Different insertion forces are generated at different speeds. The punctured locations are obvious in the force-displacement curves. The results of insertion simulation are generally consistent with experimental data. Maps of von Mises stress reflect the tissue injury of the cornea during insertion process, and punctured status corresponds to the point in the curves. Conclusions: The ability of this study to reproduce the behavior of needle insertion into cornea opens a promising perspective for the control of robotic surgery operation as well as the real-time simulation of corneal suture surgery.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Corneal hyper-viscoelastic model: derivations, experiments, and simulations
Autorzy:: Su, P.
Yang, Y.
Song, Y
Tematy:: rogówka
biomechanika
hiperelastyczność
lepkosprężystość
cornea
biomechanics
constitutive model
hyperelastic
viscoelastic; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/307042.pdf Link otwiera się w nowym oknie
Opis:: Purpose: The aim of this study is to propose a method to construct corneal biomechanical model which is the foundation for simulation of corneal microsurgery. Methods: Corneal material has two significant characteristics: hyperelastic and viscoelastic. Firstly, Mooney–Rivlin hyperelastic model of cornea obtained based on stored-energy function can be simplified as a linear equation with two unknown parameters. Then, modified Maxwell viscoelastic model of the cornea, whose analytical form is consistent with the generalized Prony-series model, is proposed from the perspective of material mechanics. Results: Parameters of the model are determined by the uniaxial tensile tests and the stress-relaxation tests. Corneal material properties are simulated to verify the hyper-viscoelastic model and measure the effectiveness of the model in the finite element simulation. On this basis, an in vivo model of the corneal is built. And the simulation of extrusion in vivo cornea shows that the force is roughly nonlinearly increasing with displacement, and it is consistent with the results obtained by extrusion experiment of in vivo cornea. Conlusions: This paper derives a corneal hyper-viscoelastic model to describe the material properties more accurately, and explains the mathematical method for determination of the model parameters. The model is an effective biomechanical model, which can be directly used for simulation of trephine and suture in keratoplasty. Although the corneal hyper-viscoelastic model is taken as the object of study, the method has certain adaptability in biomechanical research of ophthalmology.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Analysis of large particle sizes using a machine vision system
Autorzy:: Zhang, Z.
Yang, J.
Su, X.
Ding, L.
Tematy:: machine vision
particle size distribution
equivalent ellipse
best-fit rectangle
representing analysis; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/109404.pdf Link otwiera się w nowym oknie
Opis:: Many methods based on machine vision were used to estimate coarse particles size distribution in recent years, but comparison of accuracy parameters representing particle size has not been carried out and a related representing analysis has not been yet proposed. Nine parameters were investigated. The results indicated the minor axis of equivalent ellipse and breadth of the best-fit rectangle were the most suitable for representing particle size. The former accuracy ratio was 86.43% and the latter accuracy ratio was 85.39%, while the accuracy of other parameters was less than 70%. A related representing analysis was proposed to explain this phenomenon. This research is instructive and meaningful for the size distribution estimation by machine vision.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Influence of the Thickness of Graphene Coating on the Electromagnetical and Mechanical Properties of Double-Layer Coated Basalt Fibre Fabrics
Wpływ grubości powłoki grafenowej na właściwości elektromagnetyczne i mechaniczne dwuwarstwowo powlekanych tkanin z włókien bazaltowych
Autorzy:: Liu, Yuanjun
Yang, Yanfeng
Yang, Zhanhua
Liu, Yanyan
Su, Ying
Niu, Jiarong
Tematy:: double-layer coating
basalt fabric
dielectric constant
shielding effectiveness
thickness
powłoka dwuwarstwowa
tkanina bazaltowa
stała dielektryczna
skuteczność ekranowania
grubość; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Powiązania:: https://bibliotekanauki.pl/articles/234005.pdf Link otwiera się w nowym oknie
Opis:: A double-layer coated basalt fibre fabric was prepared using polyurethane as the matrix and applying coating technology to the basalt fibre fabric. The influence of the thickness of the graphene coating on the electromagnetic properties and mechanical properties of the double-layer coated basalt fibre fabric was studied. Results showed that when the thickness of the graphene coating was 2.0 mm, the polarising ability, loss ability and attenuating ability of the fabric with respect to electromagnetic waves were all the largest. Along with the increasing thicknesses of the graphene coating, the electromagnetic shielding effectiveness of the double-layer coated basalt fibre fabric also increased, then the shielding ability against electromagnetic waves became stronger.
W pracy przygotowano dwuwarstwowo powlekaną tkaninę z włókna bazaltowego, stosując poliuretan jako matrycę i stosując technologię powlekania na tkaninę z włókien bazaltowych. Badano wpływ grubości powłoki grafenowej na właściwości elektromagnetyczne i mechaniczne dwuwarstwowo powlekanej tkaniny bazaltowej. Wyniki pokazały, że gdy grubość powłoki grafenowej wynosiła 2.0 mm, polaryzacja, zdolność do strat i zdolność tłumienia tkaniny w odniesieniu do fal elektromagnetycznych były największe. Wraz ze wzrostem grubości powłoki grafenowej wzrastała również skuteczność ekranowania elektromagnetycznego dwuwarstwowo powlekanej tkaniny bazaltowej z włókien bazaltowych, a następnie zdolność ekranowania przed falami elektromagnetycznymi stała się silniejsza.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: New approach to spindle thermal extension measuring based on machine vision for the vertical maching centre
Autorzy:: Su, Dongxu
Cai, Xin
Li, Yang
Zhao, Wanhuan
Zhang, Huijie
Tematy:: Spindle thermal extension measuring
machine vision
Gaussian sub-pixel fitting
thermal error compensation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/1849108.pdf Link otwiera się w nowym oknie
Opis:: When machine tool spindles are running at a high rotation speed, thermal deformation will be introduced due to the generation of large amounts of heat, and machining accuracy will be influenced as a result, which is a generalized issue in numerous industries. In this paper, a new approach based on machine vision is presented for measurements of spindle thermal error. The measuring system is composed of a Complementary Metal-Oxide-Semiconductor (CMOS) camera, a backlight source and a PC. Images are captured at different rotation angles during end milling process. Meanwhile, the Canny edge detection and Gaussian sub-pixel fitting methods are applied to obtain the bottom edge of the end mill which is then used to calculate the lowest point coordinate of the tool. Finally, thermal extension of the spindle is obtained according to the change of the lowest point at different time steps of the machining process. This method is validated through comparison with experimental results from capacitive displacement sensors. Moreover, spindle thermal extension during the processing can be precisely measured and used for compensation in order to improve machining accuracy through the proposed method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Study on seawater scrubbing for SO2 removal from ships power plant exhaust gas
Autorzy:: Ma, Yiping
Xu, Leping
Su, Penghao
Feng, Daolun
Yang, Kailiang
Tematy:: sulfur dioxide
absorption
seawater
dwutlenek siarki
adsorpcja
woda morska; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/207540.pdf Link otwiera się w nowym oknie
Opis:: The mechanism of SO₂ absorption in seawater is investigated, and the experiment was carried out accordingly. Emphasis is on applications of seawater scrubbing of ship’s power plant exhaust gas containing SO₂. The formulated model is used to predict the influence of various parameters on both pH of tailwater and seawater desulfurization capability, e.g., the partial pressure of SO₂, the partial pressure of CO₂, tailwater temperature, pH and alkalinity of seawater. Experiment results indicated that the seawater desulfurization capacity increases with both increasing partial pressure of SO₂, pH and alkalinity and decreasing partial pressure of CO₂ and temperature. The study shows the desulfurization capacity of seawater with 3.5% salinity is approximately twice that of freshwater. Different scenarios in which the required absorbent supply rate for a given SO₂ removal efficiency are studied. It is observed a 97% removal efficiency, corresponding to meeting the SO_x limits in the SO_x emission control areas (SECA) while operating on a heavy fuel oil containing sulfur 3.5 wt. %, requires a minimum water supply rate of 0.0407–0.0683 m³/kWh, depending mainly on the water composition in terms of alkalinity and salinity. Such data are important in assessing the operation cost of the water scrubbing system.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Design and analysis of interior composite-rotor bearingless permanent magnet synchronous motors with two layer permanent magnets
Autorzy:: Sun, X.
Su, B.
Chen, L.
Yang, Z.
Li, K.
Tematy:: bearingless motor
permanent magnet motor
finite element analysis
cogging torque
static electromagnetic characteristics
silnik z magnesem trwałym
analiza elementów skończonych
moment skręcający
właściwości elektromagnetyczne
silnik bezłożyskowy; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200490.pdf Link otwiera się w nowym oknie
Opis:: In this paper, a new type of interior composite-rotor bearingless permanent magnet synchronous motors (BPMSMs) with two layer permanent magnets (PMs) is proposed. In order to reduce the torque ripple of this kind of motors, the sizes of PMs are optimized. Moreover, the magnetic field analysis of the interior composite-rotor BPMSM with two layer PMs is carried out by the finite element method (FEM). The corresponding static electronic magnetic characteristics at no load, including magnetic field, PM flux linkage and inductance, are studied in detail. In addition, electromagnetic torque characteristics and suspension force characteristics are also investigated thoroughly. The results of the analysis and simulation lay a significant foundation for further research on the interior composite-rotor BPMSMs with two layer PMs.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Predicting air quality trends in Malaysia’s largest cities : the role of urban population dynamics and COVID-19 effects
Autorzy:: Wong, Ming Wong
Tzeng, Shian-Yang
Mo, Hao-Fan
Su, Wunhong
Tematy:: air quality index
COVID-19
Malaysia
cluster analysis
generalized additive mixed model; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59111314.pdf Link otwiera się w nowym oknie
Opis:: This paper aims to explore the relationship between the Air Quality Index (AQI), COVID-19 incidence rates, and population density within Malaysia’s ten most populous cities from January 2018 to December 2021. Data were sourced from the Department of Statistics Malaysia, the World Air Quality Index Project, and Our World in Statistics. The methodology integrated population-based city classification and AQI assessment, cluster analysis through SPSS, and Generalized Additive Mixed Model (GAMM) analysis using R Studio despite encountering a data gap in AQI for five months in 2019. Cities were organized into three clusters based on their AQI: Cluster One included Ipoh, Penang, Kuala Lumpur, and Melaka, Cluster Two comprised Kuantan, Seremban, Johor Bahru, and Kota Bharu, Cluster Three featured Kota Kinabalu and Kuching. GAMM analysis revealed prediction accuracies for AQI variations of 58%, 60%, and 41% for the respective clusters, indicating a notable impact of population density on air quality. AQI variations remained unaffected by COVID-19, with a forecasted improvement in air quality across all clusters. The paper presents novel insights into the negligible impact of COVID-19 on AQI variations and underscores the predictive power of population dynamics on urban air quality, offering valuable perspectives for environmental and urban planning.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Microstructure and Mechanical Properties of Duplex Structured Mg-Li-Zn-Y Alloys
Autorzy:: Su, J.
Yang, Y.
Fu, X.
Ma, Q.
Ren, F.
Peng, X.
Tematy:: alloy Mg-Li-Zn-Y
microstructure
mechanical properties
extruded
stop Mg-Li-Zn-Y
mikrostruktura
właściwości mechaniczne
wytłaczanie; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/381787.pdf Link otwiera się w nowym oknie
Opis:: As-cast Mg-6Li-0.3Zn-0.6Y and Mg-6Li-1.2Zn-1.2Y (wt%) alloys were prepared and extruded at 260 ºC with an extrusion ratio of 25. The microstructure and mechanical behavior of as-cast and extruded alloys are reported and discussed. The results show that Mg-6Li-1.2Zn- 1.2Y alloy is composed of α-Mg, β-Li, and W-Mg3Zn3Y2 phases while Mg-6Li-0.3Zn-0.6Y alloy contains α-Mg, β-Li, W-Mg3Zn3Y2 phase and X-Mg12ZnY. After hot extrusion, the microstructure of specimens is refined and the average grains size of extruded alloys is 15 μm. Dynamic recrystallization occurs during the extrusion, leading to grain refinement of test alloys. Both the strength and elongation of test alloys are improved by extrusion. The extruded Mg-6Li-0.3Zn-0.6Y alloy possesses an ultimate strength of 225 MPa with an elongation of 18% while the strength and elongation of Mg-6Li-1.2Zn-1.2Y alloy are 206 MPa and 28%, respectively. The X-phase in Mg-6Li-0.3Zn- 0.6Y is beneficial to the improvement of strength, but will lead to the decrease of ductility.
Dostawca treści:: Biblioteka Nauki

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