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    Wyświetlanie 1-12 z 12
    Tytuł:
    Three-port beam splitter based on a sandwiched grating with an improved aspect ratio
    Autorzy:
    Shu, W
    Wang, B
    Li, H
    Li, W
    Chen, L.
    Lei, L.
    Zhou, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/174445.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    aspect ratio
    sandwiched grating
    three-port beam splitter
    Opis:
    In this paper, a fused-silica transmission grating used as a three-port beam splitter is designed by using the rigorous coupled-wave analysis, which is based on the sandwiched grating structure at the wavelength of 800 nm under normal incidence. Firstly, it is feasible to realize such a grating with the prescribed grating duty cycle and grating period. Next, high efficiency can be also achieved for both TE and TM polarizations. Moreover, the aspect ratio of the grating depth to the ridge width can be improved, which is significant for practical applications. At last, the three-port beam splitter is designed with a covering layer on the surface, which can extend its life service.
    Źródło:
    Optica Applicata; 2015, 45, 3; 279-284
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sex-specific responses of Populus deltoides to defoliation
    Autorzy:
    Shuxin, L.
    Lei, Y.
    Baoli, D.
    Shuming, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/57690.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    There has been an increasing interest in understanding the differential effects of sexual dimorphism on plant stress responses. However, there is no clear pattern in the responses of the sexes to defoliation. In this study, the effects of different severity of artificial defoliation on biomass production, total nonstructural carbohydrate (NSC) concentration, and photosynthetic rate (PN) of male and female Populus deltoides were examined. We used half and full defoliation to observe the differences between the sexes in three harvest dates (1 week, 4 weeks, and 8 weeks after treatments). We hypothesized that female and male P. deltoides compared with an undefoliated control would have compensatory growth in response to defoliation treatments. Results showed that half and full defoliation reduced the growth of both sexes. Following half defoliation, root growth was reduced, especially in males, at T2 (4 weeks after defoliation) and T3 (8 weeks after defoliation), while males showed an increase in height increment under the half defoliation compared with the nondefoliation treatments. By contrast, females were more negatively affected by defoliation than males in terms of biomass after 8 weeks. One week after defoliation, PN increased significantly in females and males under half defoliation (+30%, +32%, respectively) and full defoliation (+58%, +56%, respectively). However, 8 weeks after defoliation, there was little difference in PN between defoliated and undefoliated female cuttings. Increases in stomatal conductance (gs) and leaf nitrogen were observed under fully defoliated female and male cuttings. Moreover, males had less NSC concentrations following half defoliation compared with females. Our results indicate that leaf compensatory growth in male cuttings of P. deltoides was maintained by obtaining greater photosynthetic capacity, higher leaf nitrogen, and lower NSC concentration following half and full defoliation. Our results highlight that females suffered from greater negative effects than did males following half defoliation, but under full defoliation, the differences between both sexes were subtle.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2017, 86, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarization-selective beam splitter by a sandwiched grating
    Autorzy:
    Wang, B
    Chen, L
    Lei, L
    Zhou, J
    Powiązania:
    https://bibliotekanauki.pl/articles/174875.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    modal method
    rigorous coupled-wave analysis (RCWA)
    sandwiched grating
    high efficiency
    beam splitter
    Opis:
    We describe a polarization-selective beam splitter by a sandwiched grating, which can fulfill the high efficiency element for TE polarization and the two-port output for TM polarization. The modal method and the rigorous coupled-wave analysis (RCWA) are employed together to optimize the polarization-selective beam splitter. According to the modal method, the grating duty cycle and period are discussed to analyze the physical mechanism of such a dual-function element. Using RCWA, grating depth and thickness of the covering layer are accurately optimized to design such a polarization-selective beam splitter. With the optimized grating duty cycle, period, depth and covering layer thickness, TE polarization can be mainly diffracted in the –1st order and two-port output can be achieved for TM polarization in the 0th and the –1st orders. The polarization-selective beam splitter should be a useful element in a variety of applications with advantages of high efficiency, wideband property, and dual functions based on a sandwich grating.
    Źródło:
    Optica Applicata; 2013, 43, 2; s. 229-236
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarization-independent metal-dielectric grating with improved bandwidth
    Autorzy:
    Wang, B
    Li, H
    Shu, W
    Li, W
    Li, C
    Lei, L
    Zhou, J
    Powiązania:
    https://bibliotekanauki.pl/articles/174684.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    rigorous coupled-wave analysis
    reflective efficiency
    improved bandwidth
    Opis:
    A polarization-independent reflective grating with improved bandwidth is presented based on the mixed metal-dielectric grating. The novel grating is composed of the substrate, the metal slab, two dielectric layers, and the covering layer. The grating parameters are optimized for the special duty cycle of 0.6 at an incident wavelength of 1550 nm used in dense wavelength division multiplexing (DWDM). With the designed grating, high efficiency can be diffracted into the reflective –1st order for both TE and TM polarizations, where the polarization-independence is exhibited. Most importantly, the efficiency of more than 90% can be achieved within the incident wavelength bandwidth of 1262–1686 nm, where the bandwidth is improved greatly compared with the reported surface-relief single-layer grating. The reflective grating can have advantages of high efficiency, polarization-independence, and wide bandwidth, which should be useful for DWDM applications.
    Źródło:
    Optica Applicata; 2015, 45, 1; 71-77
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Properties and Fracture Analysis of Clinched Joints in Titanium Sheet Materials
    Autorzy:
    He, X.
    Lei, L.
    Zhang, Y.
    Xing, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030360.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    46.70.-p
    Opis:
    Mechanical fastening techniques are used extensively in different industry fields for joining various materials in the assembly of components and structures. The use of mechanical clinching is of interest to different industries such as aerospace, automotive, packaging and domestic appliance. This, together with increasing use of light-weight materials, has produced a significant increase in the use of mechanical clinching in light-weight structures in recent years. This paper deals with the mechanical properties and fracture analysis of extensible die clinched joints in the dissimilar metal sheets combinations of titanium sheet material and aluminum sheet material. Tensile-shear tests were carried out to characterize the mechanical properties of different clinched joints made of the dissimilar metal sheets combinations. The normal hypothesis tests were performed to examine the rationality of the test data. The load-bearing capacity and failure modes of different titanium sheets clinched joints were studied. Results showed that most titanium sheets clinched joints failed in the neck fracture mode. Results also showed that the load-bearing capacity of clinch joints with titanium as upper sheets is higher than that of the clinched joints with titanium as lower sheets.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 16-19
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Highly-efficient three-port output by metal-mirror-based grating
    Autorzy:
    Li, H.
    Wang, B.
    Shu, W.
    Chen, L.
    Lei, L.
    Zhou, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/174526.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    three-port output
    metal-mirror-based grating
    rigorous coupled-wave analysis
    Opis:
    A highly-efficient three-port output of metal-mirror-based grating is proposed in this paper. The metal-mirror-based grating can function as a beam splitter which can diffract the normal incident wave into the 0th and the +/- 1st orders for both TE and TM polarizations with the usual duty cycle of 0.5. The analysis of the grating parameters can be optimized by rigorous coupled-wave analysis. The high efficiency for TE and TM polarizations shall be realized. By means of the numerical simulation, the depth and connecting layer thickness of grating can be accurately calculated. The efficiency of per port is near 33.3%, so the novel three-port output grating with a connecting layer would be an excellent optical element.
    Źródło:
    Optica Applicata; 2016, 46, 1; 87-92
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ethnobotany of Acorus in China
    Autorzy:
    Shu, H.
    Zhang, S.
    Lei, Q.
    Zhou, J.
    Ji, Y.
    Luo, B.
    Hong, L.
    Li, F.
    Liu, B.
    Long, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/59160.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    In China, species in the genus Acorus are used for many different purposes, viz., in traditional medicine, for rituals, and as ornamental plants. Acorus calamus (sweet flag) has been a symbolic plant in Chinese culture for many centuries and is used as a ceremonial object in festivals throughout the country. For other Acorus species in China, ethnobotanical records are few. During field investigations from 2006 to 2017, we interviewed 573 individuals representing ethnic groups such as the Miao, Yao, Buyi, Shui, Tujia, Dong, She, Maonan, Zhuang, Yi, and Han people. Various ethnobotanical approaches were adopted in the field surveys, including key informant interviews, semistructured interviews, participatory observation, direct observation, etc. The results have revealed a rich treasure trove of traditional knowledge on Acorus in China. Two species (A. macrospadiceus and A. gramineus) were used by ethnic groups as spices to add flavor to meat. Through the study found that all the species of Acorus had medicinal value, especially A. tatarinowii, deafness, blindness, and digestive disorders were among the conditions commonly treated using these plants. Traditional knowledge of the cultural, ethnomedicinal, and food values of Acorus, based on our recent literature surveys and field investigations in China is presented here. A better understanding of Acorus is vital for conserving the plants and the traditional knowledge associated with them.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2018, 87, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Microwave Sintering on Properties and Microstructure of Ferromanganese Alloy Powders
    Autorzy:
    Lei, L.
    Libo, Z.
    Linqing, D.
    Hongbo, Z.
    Guo, C.
    Jinhui, P.
    Qin, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/947519.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microwave sintering
    ferromanganese powder
    densification
    liquid phase
    process conditions
    Opis:
    Microwave sintering process was employed to agglomerate ferromanganese alloy powders. The effects of sintering temperature, holding time and particle size composition on the properties and microstructure of sintering products were investigated. The results was shown that increasing sintering temperature or holding time appropriately is beneficial to increase the compressive strength and volume density. SEM and EDAX analysis shows that the liquid phase formed below the melting point in the sintering process, which leads to densification. XRD patterns indicate that the main reaction during microwave sintering is the decarbonization and carburization of iron carbide phase. The experiment demonstrate that the optimum microwave sintering process condition is 1150°C, 10 min and 50% content of the powders with the size of –75 μm.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 547-553
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Catalytic oxidation of lignin to aromatics over salen-porphyrin complex as a biomimetic catalyst
    Autorzy:
    Lu, X.-J.
    Zhou, X.-F.
    Zhu, Z.-L.
    Sun, Y.
    Tang, K.
    Lei, F.-H.
    Liu, Z.-G.
    Wang, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/52771.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2019, 62, 203
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Binary-phase metal-based sandwiched grating with high efficiency
    Autorzy:
    Wang, B.
    Chen, L.
    Lei, L.
    Zhou, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/174769.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    binary phase
    metal layer
    sandwiched grating
    Opis:
    We describe a novel high efficiency element based on a binary-phase metal-based sandwiched grating, where the binary grating is covered by a dielectric layer and connected by a metal slab on the fused-silica substrate. The modal method is used to optimize the grating duty cycle and period to analyze the feasibility to achieve high efficiency for TE and TM polarizations by effective indices of the modes excited in the grating region. Rigorous coupled-wave analysis (RCWA) is employed to optimize the grating depth and to cover the layer thickness accurately by numerical calculations. It is not easy for the conventional binary grating with a usual duty cycle to achieve high efficiency in the –1st order for TM polarization. For the binary-phase metal-based sandwiched grating, high efficiency can be diffracted into the –1st order for not only TE polarization but also TM polarization. Moreover, the wide fabrication tolerance, the wideband property and the flat surface of easy cleaning should be significant for practical applications in a variety of optical systems.
    Źródło:
    Optica Applicata; 2013, 43, 3; 607-613
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Beyond Numbers: Unveiling the Transition Experiences and Voices of Filipino Education Programme Supervisors
    Autorzy:
    Salva, Royce A.
    Cadavedo, Lualhati O.
    Cadavedo, Ser Voie O.
    Patinga, Kristine T.
    Cabatay, Christine Lei L.
    Powiązania:
    https://bibliotekanauki.pl/articles/29520552.pdf
    Data publikacji:
    2024-03-31
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    face-to-face
    in-person supervision
    qualitative
    thematic analysis
    Opis:
    This qualitative exploration is a follow-up study to the quantitative research published in a peer-reviewed international journal in 2023. Generally, the study delved into the transition experiences and preferences of 20 Filipino education supervisors in relation to their supervisory practices in over 80 Philippine public schools. Through validated open-ended interview questions, the responses were gathered and subsequently subjected to thematic analysis, which resulted in the emergence of the following themes: (1) the adjustments and challenges of the supervisors as they switched back from technology-assisted to in-person supervision; and (2) their preferred mode of supervision in the new normal of education.
    Źródło:
    The New Educational Review; 2024, 75; 102-112
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A New Inverted Torsion Pendulum-Based Mechanical Spectrometer to Study Soft Matter
    Autorzy:
    Lei, M. L.
    Chen, L.
    Xiong, X. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351272.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    soft matter
    mechanical spectrometer
    inverted torsion pendulum
    viscoelasticity
    mechanical spectroscopy
    viscosity
    Opis:
    A new multifunctional mechanical spectrometer is developed based on an inverted torsion pendulum showing high precision in a wide frequency range to study soft matter. Apart from measuring the internal friction of solids it can also be used to study viscoelasticity. In this report we describe basic principles of the novel instrument.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 13-16
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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