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    Wyświetlanie 1-11 z 11
    Tytuł:
    Laser Power Transmission and Its Application in Laser-Powered Electrical Motor Drive: A Review
    Autorzy:
    Liu, Hongzuo
    Zhang, Yixuan
    Hu, Yihua
    Tse, Zion
    Wu, Jing
    Powiązania:
    https://bibliotekanauki.pl/articles/1955981.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    laser power transmission
    photovoltaic material
    laser diode
    optical fibre power transmission
    atmosphere transmission
    Opis:
    Laser power transmission (LPT) is considered a potentially efficient way for power delivery, especially in long-distance wireless applications and harsh hazardous environmental conditions. In contrast to other wireless power transmission (WPT) methods, LPT has many advantages such as lower device size, focused transmitting direction and high power density. With the development of technology, LPT has been widely adopted in several fields. In conservative industries, the utilisation of LPT can resolve the limitation problem in a wired connection. The adverse influence of electromagnetic interference (EMI) concerning application and high-temperature fields can be reduced. This paper will give a simple review of LPT and demonstrate the basic concept of a photoelectric emitter, transmission channel and receiver material. Based on the recent research about diode laser beam combining technology and high-efficiency multi-junction photovoltaics (PV) materials, the advised LPT devices for simple application as laser power motor will be simply discussed.
    Źródło:
    Power Electronics and Drives; 2021, 6, 41; 167-184
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanistic study on the flotation of barite with C18H33NaO2 under microwave radiation based on UV-visible spectrophotometric analysis
    Autorzy:
    Guo, Jing
    Wen, Ming
    Wu, Jingxuan
    Powiązania:
    https://bibliotekanauki.pl/articles/2175439.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    UV-visible spectrophotometer
    microwave
    barite
    flotation mechanism
    Opis:
    Based on the pure mineral flotation tests of barite, this study investigated the effect law of microwave on barite flotation by using a UV-visible spectrophotometer (L5), solution chemistry calculation, and zeta potential, scanning electron microscope (SEM), and other testing methods. Additionally, red flotation kinetic analysis was carried out to deeply explore the mechanism of C18H33NaO2 flotation of barite under microwave radiation. Mineral flotation tests showed that after microwave treatment, the flotation recovery of barite and deionized water increased by 2.67% and 3.35%, respectively, while that of the microwave action pulp and chemically added pulp decreased by 2.90% and 8.51%, respectively. Microwave action on barite can improve its flotation recovery (up to 95.27%). The action of microwave heating can improve the positive electrical properties of the surface of barite, and accordingly, its specific surface area would be enlarged. In this case, the adsorption rate of sodium oleate on the surface of barite increased, thereby improving the flotation recovery. The flotation kinetics analysis revealed that the k-value of the primary kinetic model was the most informative among the four models of flotation kinetics, and its fitting results can truly reflect the flotation results of barite before and after the microwave action. Through the analysis of barite flotation adsorption experiment under microwave action and with sodium oleate as a collector, this study revealed the mechanism of C1818H33NaO2 on barite flotation under a microwave roaster. This study provides an important reference for the research on efficient barite flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 156349
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhanced sulfidation of chrysocolla with ammonium carbamate and its effect on flotation
    Autorzy:
    Wang, Ziang
    Wu, Dandan
    Cao, Jing
    Chen, Huiqin
    Powiązania:
    https://bibliotekanauki.pl/articles/24085837.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chrysocolla
    ammonium carbamate
    surface modification
    sulfidation
    Opis:
    In this study, flotation experiments, zeta potential, XPS, AFM, SEM-EDS, and contact angle measurements were performed to study the influence of ammonium carbamate (CH6N2O2) on the sulfidation flotation of chrysocolla. The results of the sulfidation flotation experiments showed that the recovery of chrysocolla increased more than 40% on the optimal condition after adding ammonium carbamate. In addition, the zeta potential of samples with ammonium carbamate was clearly higher than ores for pH > 6, which was due to the complexation reaction between ammonium carbamate and copper ion on the surface of chrysocolla samples. The activity of copper adsorption has also been improved. Furthermore, the XPS data indicated that the content of Cu-S compounds on the mineral surface has been significantly enhanced after ammonium carbamate complex sulfidation. The chemical analysis of the solution led to the same conclusion. The AFM results showed that ammonium carbamate had a positive impact on the adsorption of minerals surface, and increased the flotation recovery. It can be deduced from the SEM-EDS analysis that the surface of chrysocolla better combined with S–, and more Cu-S components were generated on the surface, which led to 1.04% increase of S atomic concentration. Finally, the contact angle measurements showed that the water contact angle of chrysocolla after adding ammonium carbamate could reach 90.4°, which proved that the sulfidation improved the floatability of the chrysocolla sample.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 3; atr. no. 168573
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    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:
    Study on strength characteristics and permeability of chlorite schist during triaxial compression permeability
    Autorzy:
    Wang, Fuqi
    Xue, Weipei
    Qiao, Zhongdong
    Wu, Jun
    Jing, Laiwang
    Powiązania:
    https://bibliotekanauki.pl/articles/27312096.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    łupek chlorynowy
    charakterystyka wytrzymałościowa
    przepuszczalność
    kompresja trzyosiowa
    opaska kompresyjna
    chlorite schist
    strength characteristic
    permeability
    triaxial compression
    compression band
    Opis:
    In order to grasp the strength characteristics and permeability of chlorite schist, the triaxial compression permeability test of chlorite schist was carried out by using a rock triaxial servo testing machine equipped with seepage device. Based on the test results, the failure strength, initial permeability and permeability development of rock samples under different confining pressure and different pore water pressure are compared, and the failure types of rock samples under triaxial compression permeability and their influence on permeability are analyzed. The results show that the increase of confining pressure is conducive to the improvement of failure strength of chlorite schist, and the increase of pore water pressure reduces the failure strength, which is related to the inhibition of crack development in rock samples by confining pressure and the promotion of crack expansion by pore water pressure. The mechanical deformation of chlorite schist in triaxial compression permeability process has experienced initial compaction stage, linear elastic stage and crack stable propagation to failure stage. As a consequence, permeability shows three trends of decline, stable development and rise, which is closely related to the development of the internal structure of rock samples at each stage. During the failure of triaxial compression permeability, there is a local compression zone in chlorite schist, and the rising rate slows down due to the influence of the compression zone.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 2; 353--365
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on tensile fracture failure of a steel plate with a surface crack
    Autorzy:
    Chong, Zhewen
    Tao, Jing
    Xie, Yuehui
    Wu, Dongrong
    Li, Tao
    Powiązania:
    https://bibliotekanauki.pl/articles/2200891.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    steel plate
    surface crack
    stress intensity factor
    SIF
    fracture failure
    Opis:
    In order to study the effect of different surface crack parameters on the fracture failure of steel plate, the model was established by FEM. The results showed that the edge surface crack has the greatest influence on the fracture failure of the steel plate, and for non-edge surface cracks, the central surface crack has the greatest influence on the fracture failure of the steel plate. The larger the a/t and the smaller the a/c, the easier the steel plate fracture failure occurs. The a/c has a certain influence on the variation law of K and the position where Kmax appears.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 343--354
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MATLAB modelling of double sided photovoltaic cell module
    Autorzy:
    Zhen, Yan
    Zuyu, Wu
    Ninghui, Zhu
    Ligen, Yuan
    Yu, Chen Jing
    Powiązania:
    https://bibliotekanauki.pl/articles/1955976.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    double sided photovoltaic module
    back irradiance
    modelling
    output characteristics
    MPPT
    Opis:
    In this paper, the equatorial coordinate system is taken as the celestial coordinates, the double-sided photovoltaic module irradiance model is established by using the MATLAB simulation software, and the double-sided photovoltaic module irradiance model is combined with the photovoltaic module model (Jianhui (2001)) to form the mathematical model of the real-time generation system of double-sided photovoltaic modules. The effectiveness of the simulation model was verified by building an experimental platform, and the output characteristics of the optimal line spacing between the double-sided p-v module and the single-sided p-v module were further tested and compared.
    Źródło:
    Power Electronics and Drives; 2021, 6, 41; 12-25
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarization dependent high refractive index metamaterial with metallic dielectric grating structure in infrared band
    Autorzy:
    Li, Jianmin
    Chen, Peng
    Fang, Bo
    Cai, Jinhui
    Zhang, Le
    Wu, Yinglai
    Jing, Xufeng
    Powiązania:
    https://bibliotekanauki.pl/articles/2172825.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    metamaterial
    high refractive index
    infrared band
    Opis:
    According to the theory of high refractive index of metamaterials, a composite structure of metal dielectric grating was designed to achieve high refractive index in infrared band. Based on the S-parameter inversion algorithm, we extracted the effective permittivity, the effective permeability, and the effective refractive index of the designed metamaterial. By changing the geometric parameters of the composite grating metamaterial structure, the effective refractive index of the designed metamaterial reaches more than 8.0 at the infrared resonance frequency. This is a high refractive index that many natural materials cannot achieve. It is noteworthy that the metamaterial structure has obvious polarization sensitivity. The metamaterial structure has both high refractive index and wideband zero refractive index properties when different polarized light is incident. At the same time, we further investigate the influence of metamaterial geometric parameters on the effective refractive index of metamaterials. Also, we propose a double grating metamaterial structure to obtain more degrees of freedom of metamaterial on the effective refractive index.
    Źródło:
    Optica Applicata; 2022, 52, 3; 441--460
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    COMBINATION OF BERBERINE AND MATRINE AFFECTS APOPTOSIS AND CELLCYCLE IN HUMAN CERVICAL CANCER CELLS
    Autorzy:
    Zhang, Qijiayu
    Sun, Yi
    Huang, Yuxi
    Sun, Jing
    Zhao, Chongbo
    Song, Yijun
    Wu, Juanhua
    Powiązania:
    https://bibliotekanauki.pl/articles/895719.pdf
    Data publikacji:
    2019-12-29
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    apoptosis
    cervical cancer
    Matrine
    berberine
    Opis:
    Cervical cancer is the fourth leading cause of malignancy-related mortality in women worldwide, and effective advanced-stage therapies are urgently required. Berberine is a quaternary ammonium compound extracted from traditional Chinese medicinal herbs, including Phellodendron spp., with antibacterial and antitumor activities. Matrine, the main active ingredient of Sophora flavescens rhizomes, has not only traditionally described health effects but is also widely used for its anticancer, anti-inflammatory, immunoregulatory, antiviral, and hepatoprotective effects. We investigated the antitumor activities of berberine and matrine against human cervical cancer HeLa and SiHa cells using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, along with flow cytometry and western blotting analyses, to assess the effect of the compounds on the cellular status and apoptosis- and cell cycle-related proteins. The 24 h half-maximal inhibitory concentrations (IC50) of berberine and matrine were 123.633 ± 4.278 µmol/L and 9.625 ± 0.245 mmol/L against HeLa cells and 105.067 ± 3.745 µmol/L and 8.50 ± 0.23 mmol/L against SiHa cells, respectively. Berberine plus matrine inhibited cancer cell growth and caused cell cycle arrest. We observed an increased stimulation of apoptosis, which was likely mediated by enhanced levels of caspase-3, caspase-9, and B-cell lymphoma 2 (Bcl-2)-associated X protein (Bax), as well as decreased Bcl-2 protein expression. Cell cycle arrest in the G1 phase was probably mediated by p21 upregulation and cyclin-dependent kinase (Cdk)-4, Cdk-6, and cyclin D1 suppression. Combination treatment with berberine and matrine effectively inhibited human cervical cancer cell proliferation, most likely by stimulating apoptosis and inducing cell cycle arrest.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 6; 1089-1097
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stigmasterol blocks cartilage degradation in rabbit model of osteoarthritis
    Autorzy:
    Chen, Wei-Ping
    Yu, Chong
    Hu, Peng-Fei
    Bao, Jia-Peng
    Tang, Jing-Li
    Wu, Li-Dong
    Powiązania:
    https://bibliotekanauki.pl/articles/1039645.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    matrix metalloproteinases
    stigmasterol
    osteoarthritis
    Opis:
    Stigmasterol has been shown exihbit anti-osteoarthritic properties in vitro studies. However, the in vivo effects of stigmasterol on cartilage are still unclear. This study investigated the anti-osteoarthritic properties of stigmasterol on cartilage degradation in a rabbit model of osteoarthritis (OA). Twenty rabbits underwent bilateral anterior cruciate ligament transection (ACLT) to induce OA. Five rabbits were used as normal control. Two weeks after operation, the rabbits were randomly divided into two groups. Each group of 10 rabbits received intra-articular injection with 0.3 ml of stigmasterol in left knees and vehicle in right knees, once weekly. Group 1 was killed 6 weeks after ACLT and 2 were sacrificed 9 weeks after ACLT. The knee joints were assessed by gross morphology, histology and gene expression analysis. We found that expression of genes encoding matrix metalloproteinases (MMPs) was significantly higher while tissue inhibitors of metalloproteinase (TIMP)-1 was significantly lower in the both joints of the two OA groups compared to normal contrals. Stigmasterol reduced the cartilage degradation as assessed by histological analysis and markedly suppressed MMPs expression both in group 1 and group 2. Our results suggest that stigmasterol may be considered as a possible therapeutical agent in the treatment of OA.
    Źródło:
    Acta Biochimica Polonica; 2012, 59, 4; 537-541
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlation of chromosome damage and promoter methylation status of the DNA repair genes MGMT and hMLH1 in Chinese vinyl chloride monomer (VCM)-exposed workers
    Autorzy:
    Wu, Fen
    Liu, Jing
    Qiu, Yu-Lan
    Wang, Wei
    Zhu, Shou-Min
    Sun, Pin
    Miao, Wen-Bin
    Li, Yong-Liang
    Brandt-Rauf, Paul W.
    Xia, Zhao-Lin
    Powiązania:
    https://bibliotekanauki.pl/articles/2179802.pdf
    Data publikacji:
    2013-03-01
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    vinyl chloride monomer
    chromosome damage
    MGMT
    hMLH1
    DNA methylation
    Opis:
    Objective: To explore the association of the methylation status of MGMT and hMLH1 with chromosome damage induced by vinyl chloride monomer (VCM). Materials and Methods: Methylation of MGMT and hMLH1 was measured in 101 VCM-exposed workers by methylation-specifi c PCR. Chromosome damage in peripheral blood lymphocytes was measured by the cytokinesis-block micronucleus assay. The subjects were divided into chromosome damaged and non-damaged groups based on the normal reference value of micronuclei frequencies determined for two control groups. Results: MGMT promoter methylation was detectable in 5 out of 49 chromosome damaged subjects, but not in the chromosome non-damaged subjects; there was a signifi cant difference in MGMT methylation between the two groups (p < 0.05). Conclusions: We detected aberrant promoter methylation of MGMT in a small number of chromosome damaged VCM-exposed workers, but not in the chromosome non-damaged subjects. This preliminary observation warrants further investigation in a larger study.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2013, 26, 1; 173-182
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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