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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:
Combined effects of NQO1 Pro187Ser or SULT1A1 Arg213His polymorphism and smoking on bladder cancer risk: Two meta-analyses
Autorzy:
Wang, Xiao-Chun
Wang, Jian
Tao, Hui-Hui
Zhang, Chao
Xu, Li-Fa
Powiązania:
https://bibliotekanauki.pl/articles/2161894.pdf
Data publikacji:
2017-07-14
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
polymorphisms
meta-analysis
NQO1
urinary bladder neoplasms
smoking
SULT1A1
Opis:
Objectives Objectives: Cigarette smoking is the major risk factor of bladder cancer via exposure to chemical carcinogens. Nicotinamide adenine dinucleotide phosphate (NADP+): quinine oxidoreductase 1 (NQO1) and sulfotransferase 1A1 (SULT1A1) have been reported to involve in the metabolism of polycyclic aromatic hydrocarbons (PAHs) and aromatic amines. Therefore, the risk of bladder cancer (BC) may be influenced by polymorphisms in the genes that modulate metabolic detoxification in particular by interacting with cigarette smoking. Considering the limited power by the individual studies with a relatively small sample size, especially when analyzing the combined effect of polymorphisms in NQO1 and SULT1A1 genes and smoking, these 2 meta-analyses have aimed to clarify the combined effects of them on BC risk by integrating related studies. Material and Methods Two meta-analyses included 1341 cases and 1346 controls concerning NQO1 Pro187Ser and smoking, and 1921 cases and 1882 controls on SULT1A1 Arg213His and smoking were performed. Odds ratios (OR) and 95% confidence intervals (CI) were used for assessing the strength of the association. Results The result has demonstrated that smokers with NQO1 Pro/Ser or Ser/Ser genotypes have a prominent association with the risk of BC as compared with non-smokers with NQO1 Pro/Pro genotype, with OR equal to 3.71 (95% CI: 2.87–4.78, $ \text{p}_\text{heterogeneity} $ = 0.376). Besides, smokers carrying SULT1A1 Arg/Arg genotypes were observed to confer 2.38 fold increased risk of BC (95% CI: 1.44–3.93, $ \text{p}_\text{heterogeneity} $ = 0.001) when compared with non-smokers with SULT1A1 Arg/Arg or His/His genotypes. Conclusions These findings have suggested that the NQO1 Pro187Ser or SULT1A1 Arg213His polymorphism combination with smoking significantly confer susceptibility to BC. Int J Occup Med Environ Health 2017;30(5):791–802
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2017, 30, 5; 791-802
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
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:
Effect of iodine value of sodium fatty acids on flotation of collophanite
Autorzy:
Liu, Runzhe
Zhang, Guofan
Zhang, Hui
Liu, Lifen
He, Lin
Chen, Yanfei
Powiązania:
https://bibliotekanauki.pl/articles/109810.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation
vcollophanite
fatty acid
iodine value
Opis:
The sodium fatty acids were firstly prepared by fatty acids with different iodine values which were from surfactant extraction using soybean oil fatty acid as raw material in this study. Effects of iodine value of sodium fatty acids on the flotation of collophanite were then investigated by flotation tests, contact angle measurements, adsorption tests, Krafft point measurements, foaming ability tests, and the resistance to the hard water measurements. Results show that the final flotation recovery was directly proportional to the iodine value of sodium fatty acid. Sodium fatty acid with higher iodine value has higher solubility and dispersity in the solutions, and stronger foaming ability and resistance to hard water. After interacting with collophanite, sodium fatty acid with higher iodine value made the mineral more hydrophobic, thus contributing to better flotation performances.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 3; 770-778
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Sampling Spacing on the Accuracy of Volume of a Medium-Size Gully
Autorzy:
Jun, Luo
Bin, Zhang
Du, Zhengpin
Zheng, Jilin
Liu, Hui
Qin, Fachao
Deng, Qinchun
Powiązania:
https://bibliotekanauki.pl/articles/123269.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
three modes
sampling spacing
gully volume
gully cross-section
Opis:
Accurate morphological parameters are key to understand the process and mechanism of gully erosion, but little information exists regarding the accuracy of gully volume influenced by sampling spacing. In order to assess the influence of sampling spacing on volume of medium gully under the condition of different shapes of gully cross-sections, as well as to provide information for proposed surveys, a MultiStation was utilized to obtain the point cloud of a Uand V-shaped gully. The coordinates were subsequently rarefied to a certain sampling spacing, and the gully volumes of three modes (Mode 1 only including rarefied terrain points; Mode 2 including detailed terrain and rarefied terrain points; Mode 3 including the rarefied detailed terrain points and terrain points with a given sampling spacing) were calculated in ArcGIS. The results showed that the error of gully volume increased non-monotonously with sampling spacing increased, and that the detail points had greater influence on the gully volume of a U-shaped than a V-shaped gully. As to Mode 1 and 2, the relative error (RE) of U-shaped gully volume increased faster with sampling spacing increasing, and presented high positive correlation. However, in the case of a V-shaped gully, a middle positive correlation for Mode 1 can be observed, and the RE was below 3% for Mode 2. For Mode 3, an increase in the sampling spacing of the terrain led to the larger RE, average RE, and variance of absolute error. If extremely high accuracy (2.5% of RE) is required, sampling spacing is less than 0.5 m; if high accuracy (5% of RE) is set, the sampling spacing of terrain points is below 0.8 m for a U-shaped gully, while the corresponding sampling spacing of terrain points and detail points are 2.0 m and 1.85 m, 3.0 m and 1.80 m, and 4.0 m and 0.75 m for a V-shaped gully. The shape of the gully’s cross-section, as well as the exact location of the shoulder line will affect the accuracy of the gully’s volume. This study will increase the efficiency of detail survey in the field for medium gully.
Źródło:
Journal of Ecological Engineering; 2019, 20, 11; 109-121
2299-8993
Pojawia się w:
Journal of Ecological Engineering
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:
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:
Carrollite Leaching in H2SO4-NaClO3 Media at Atmospheric Pressure
Autorzy:
Dong, Bo
Wu, Jian-Hui
Wu, Jun
Zhang, Xian-Peng
Zhai, Jing-Jun
Powiązania:
https://bibliotekanauki.pl/articles/352763.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CuCo2S4
atmospheric leaching
H2SO4-NaClO3 media
Opis:
A new extraction process suitable for treating refractory CuCo2S4 under atmospheric pressure acidic leaching conditions was investigated. The effect of variables such as oxidant species, liquid-to-solid ratio, leaching time, oxidizing agent and mineral quality ratio, H2SO4 concentration, temperature and sodium chloride concentration on the extraction efficiency of Co, Cu and Fe from CuCo2S4 were investigated. Under optimal conditions including P80-P90 of the sample was d < 0.0074 mm, stirring speed of 400 rpm, leaching time of 8 h with sodium chlorate (NaClO3) and mineral quality ratio of 0.5, 2 mol/L H2SO4, liquid-to-solid ratio of 7, leaching temperature of 90°C and 4 mol/L sodium chloride. The leaching efficiency of Co, Cu, and Fe were nearly 97.08%, 100%, and 92.45%, respectively. Furthermore, the contents of cobalt and copper in leaching residue were all less than 0.4 wt.%, which satisfies the requirements of industrial production.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 1; 313-319
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic characteristics study on the two-stage safety valve used on hydraulic support under impact loading
Autorzy:
Zhao, Guochao
Wang, Hui
Song, Yuning
Zhang, Changshuai
Powiązania:
https://bibliotekanauki.pl/articles/2055035.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
safety valve
impact loading
hydraulic support
dynamic characteristic
Opis:
A two-stage linkage safety valve for hydraulic support is presented. Considering the hydraulic support is impacted, dynamic simulation of the column circuit with the two-stage safety valve subject impact loading was carried out, and the dynamic characteristics of the two- -stage safety valve with different impact forms were studied. A rapid impact loading test rig was built to test the two-stage safety valve sample under impact loading. Simulation and experimental results indicate that the two-stage safety valve has high sensitivity and good unloading performance, it can realize fast and large flow unloading of the hydraulic support under different impact forms and pressures.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 3; 623--635
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
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:
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:
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:
A Bidirectional Buck-Boost Converter-Based Switching Ripple Communication Strategy for Intelligent Street Lighting Systems
Autorzy:
Zhang, Yixuan
Hu, Yihua
Tse, Zion
Liu, Yuwei
Deng, Jiamei
Xu, Hui
Wang, Yangang
Li, Wei
Powiązania:
https://bibliotekanauki.pl/articles/1955998.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bidirectional switching ripple communication
buck-boost converter
intelligent street lighting system
pulse width modulation
smart city
Opis:
The light-emitting diode (LED) is an essential component of intelligent street lighting (ISL) systems. An efficient ISL system can not only reduce power consumption by planning LED illuminating time but also reduce maintenance costs through a high degree of automation. In this paper, a buck-boost converter is used to realise composite transmission of power and signals for an ISL system. The power is modulated by the pulse width modulation (PWM) approach, and the switching ripple generated in the PWM process is utilised as the carrier of the signals transmitted between the remote-control centre and the slave nodes. Moreover, the proposed model involves a ‘request to send (RTS)/confirm to send (CTS)’ mechanism to avoid signal conflicts. Compared with the conventional power line communication (PLC) approach, the proposed transmission scheme has the advantages of simple circuit structure and simple system wiring. Additionally, a simulation model built in MATLAB/Simulink proves the designed transmission method has strong anti-noise ability.
Źródło:
Power Electronics and Drives; 2021, 6, 41; 260-275
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital watermarking algorithm based on 4-level discrete wavelet transform and discrete fractional angular transform
Autorzy:
Li, Jing-You
Zhao, Chun-Hui
Zhang, Guang-Da
Powiązania:
https://bibliotekanauki.pl/articles/2033921.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
digital watermarking algorithm
mix optical bistability
Harris feature point detection
discrete wavelet transform
discrete fractional angular transform
singular value decomposition
Opis:
Nowadays, there are many watermarking algorithms based on wavelet transform. The simple one is to insert directly the watermark into the wavelet transform coefficients. However, most of the existing watermarking schemes can only resist traditional signal processing attacks, such as image compression, noise and filtering. When the watermarked image is subject to geometric transformations, especially rotation attack, it is hard to detect the watermark successfully. In this paper, a digital watermarking algorithm is proposed based on 4-level discrete wavelet transform and discrete fractional angular transform. To enhance the security of the algorithm, the watermark is scrambled with the simplicity of Arnold transform and chaos-based mix optical bistability model, since the chaos is pseudorandom and sensitive to the initial values. And the watermark is embedded into the medium frequency sub-band of the 1-level wavelet decomposition according to the Harris feature point detection. Simulation results show that the proposed digital watermarking algorithm by combining 4-level discrete wavelet transform with discrete fractional angular transform could resist rotation attack and other common attacks.
Źródło:
Optica Applicata; 2021, 51, 4; 605-619
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 24

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