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    Wyświetlanie 1-11 z 11
    Tytuł:
    Research on emergency DC power support coordinated control for hybrid multi-infeed HVDC system
    Autorzy:
    Li, Congshan
    Li, Yikai
    Guo, Jian
    He, Ping
    Powiązania:
    https://bibliotekanauki.pl/articles/140422.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    additional controllers
    coordinated control
    EDCPS
    hybrid multi-infeed HVDC system
    HVDC
    Opis:
    Based on the respective characteristics of line-commutated converter highvoltage direct current (LCC-HVDC) and voltage-source converter high voltage direct current (VSC-HVDC), two additional emergency DC power support (EDCPS) controllers are designed, respectively. In addition a coordinated control strategy based on a hybrid multi-infeed HVDC system for EDCPS is proposed. Considering the difference in system recovery between LCC-HVDC and VSC-HVDC in EDCPS, according to the magnitude of the amount of potential power loss, the LCC-HVDC and VSC-HVDC priority issues of boosting power for EDCPS are discussed in detail. Finally, a hybrid three-infeed HVDC that consists of two parallel LCC-HVDCs and one VSC-HVDC that is built in PSCAD/EMTDC are simulated. The effectiveness of the proposed approach is verified based on this hybrid three-infeed HVDC system.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 1; 5-21
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Subcutaneous administration of infliximab-attenuated silica-induced lung fibrosis
    Autorzy:
    Zhang, Hua
    Sui, Jun-Na
    Gao, Lei
    Guo, Jian
    Powiązania:
    https://bibliotekanauki.pl/articles/2162006.pdf
    Data publikacji:
    2018-07-04
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    infliximab
    silicosis
    TNF-α
    rat model
    NF-κB
    iNOS
    Opis:
    Objectives To investigate the influence of the anti-tumor necrosis factor-α infliximab (IFX) in the case of rats with silicosis. Material and Methods Forty-eight Wistar rats were randomly divided into 3 groups. The study group (N = 16) – silicosis was induced by intratracheal instillation of 50 mg silica on day 1, and IFX was subcutaneously administered at a dose of 15 mg/kg of body weight from day 2 to day 6, the vehicle group (N = 16) – silica used as the study group but without IFX, the sham group (N = 16) – 1 ml of saline was intratracheal-used. Eight rats in each group were euthanized on day 7 and on day 14, respectively. Lung tissue sections were stained with hematoxylin and eosin or Masson’s trichromedye. The nuclear factor-κB p65 (NF-κB p65) positioning in the lung tissues were determined by immunohistochemical staining. Levels of tumor necrosis factor α (TNF-α) in rat serum and bronchoalveolar lavage fluid were measured with enzyme linked immunosorbent assay. The inducible nitric oxide synthase (iNOS) mRNA in the lung tissues was measured by quantitative real-time polymerase chain reaction, as well as inhibitor protein-κB (I-κB) and NF-κB p65 expression were measured quantitatively by western blotting. Results Silica installation increased the lung tissues inflammation reaction, oxidative stress and pulmonary fibrosis. Infliximab treatment significantly improved silica-induced lung pathological changes (inflammatory cells, collagen deposition), decreased the TNF-α inhibited NF-κB signaling (I-κB, NF-κB p65) as well as oxidant status (iNOS). Conclusions Infliximab may improve silica-induced pulmonary inflammation by decreasing the TNF-α, inhibiting NF-κB signaling (I-κB, NF-κB p65) as well as oxidant status (iNOS), which suggest that IFX has potential role in the treatment of silica-induced lung damage. Int J Occup Med Environ Health 2018;31(4):503–515
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2018, 31, 4; 503-515
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytic solutions of a second-order functional differential equation with a state derivative dependent delay
    Autorzy:
    Si, Jian-Guo
    Wang, Xin-Ping
    Powiązania:
    https://bibliotekanauki.pl/articles/965956.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    analytic solution
    functional differential equation
    Opis:
    This paper is concerned with a second-order functional differential equation of the form $x''(z)=x(az+bx'(z))$ with the distinctive feature that the argument of the unknown function depends on the state derivative. An existence theorem is established for analytic solutions and systematic methods for deriving explicit solutions are also given.
    Źródło:
    Colloquium Mathematicum; 1999, 79, 2; 273-281
    0010-1354
    Pojawia się w:
    Colloquium Mathematicum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Constructive Extension of the Characterization on Potentially Ks,t-Bigraphic Pairs
    Autorzy:
    Guo, Ji-Yun
    Yin, Jian-Hua
    Powiązania:
    https://bibliotekanauki.pl/articles/31342128.pdf
    Data publikacji:
    2017-02-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    degree sequence
    bigraphic pair
    potentially K s,t -bigraphic pair
    Opis:
    Let Ks,t be the complete bipartite graph with partite sets of size s and t. Let L1 = ([a1, b1], . . ., [am, bm]) and L2 = ([c1, d1], . . ., [cn, dn]) be two sequences of intervals consisting of nonnegative integers with a1 ≥ a2 ≥ . . . ≥ am and c1 ≥ c2 ≥ . . . ≥ cn. We say that L = (L1; L2) is potentially Ks,t (resp. As,t)-bigraphic if there is a simple bipartite graph G with partite sets X = {x1, . . ., xm} and Y = {y1, . . ., yn} such that ai ≤ dG(xi) ≤ bi for 1 ≤ i ≤ m, ci ≤ dG(yi) ≤ di for 1 ≤ i ≤ n and G contains Ks,t as a subgraph (resp. the induced subgraph of {x1, . . ., xs, y1, . . ., yt} in G is a Ks,t). In this paper, we give a characterization of L that is potentially As,t-bigraphic. As a corollary, we also obtain a characterization of L that is potentially Ks,t-bigraphic if b1 ≥ b2 ≥ . . . ≥ bm and d1 ≥ d2 ≥ . . . ≥ dn. This is a constructive extension of the characterization on potentially Ks,t-bigraphic pairs due to Yin and Huang (Discrete Math. 312 (2012) 1241–1243).
    Źródło:
    Discussiones Mathematicae Graph Theory; 2017, 37, 1; 251-259
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A moment-matching based method for the analysis of manipulator’s repeatability of positioning with arbitrarily distributed joint clearances
    Oparta na dopasowywaniu momentów metoda analizy powtarzalności pozycjonowania manipulatora o dowolnym rozkładzie luzów na przegubach
    Autorzy:
    Wang, Wei
    Wang, Jin
    Fu, Jian-Hui
    Lu, Guo-Dong
    Powiązania:
    https://bibliotekanauki.pl/articles/301397.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    manipulator
    positioning repeatability
    arbitrarily distributed clearance
    moment-matching
    Lagrange multipliers method
    powtarzalność pozycjonowania
    arbitralnie rozłożone luzy
    dopasowanie momentów
    metoda mnożników Lagrange'a
    Opis:
    The joint clearance can be the mainly concern factor in the analysis of repeatability of positioning for a manipulator. Traditionally, the joint clearance is empirically assumed to be uniform or normal variables. This hasty treatment may be not accurate enough when the precise statistic information of variables cannot be obtained. To handle the reliability evaluation problem with arbitrarily distributed joint clearances, a moment-matching based method is proposed. The highly nonlinear performance function is firstly established by the forward kinematics and then a second order Taylor expansion is performed on this function for the order reduction. Based on the maximum entropy principle, the Lagrange multipliers method is employed to derive a best-fit probability density function (PDF) with consideration of the first four moments-matching restrictions. This study shows that the prosed method can acquire a better accuracy and efficiency compared with the first order second moment method (FOSM), first order reliability method (FORM) and Monte Carlo simulation (MCS). A serial manipulator is applied as an example to demonstrate the new method.
    Luzy na przegubie manipulatora mogą stanowić główny czynnik wpływający na analizę powtarzalności pozycjonowania manipulatora. Tradycyjnie przyjmuje się empirycznie podbudowane założenie, że luz na przegubie jest zmienną jednorodną lub normalną. Takie ujęcie może jednak nie być wystarczająco dokładne w przypadku, gdy nie można uzyskać precyzyjnych informacji statystycznych na temat zmiennych. Aby rozwiązać problem oceny niezawodności przy dowolnie rozłożonych luzach na przegubie, zaproponowano metodę opartą na dopasowywaniu momentów. W pierwszej kolejności, obliczono za pomocą kinematyki prostej, wysoce nieliniową funkcję stanu granicznego, a następnie wyznaczono szereg Taylora drugiego rzędu dla tej funkcji w celu obniżenia rzędu. Opierając się na zasadzie maksymalnej entropii, zastosowano metodę mnożników Lagrange'a w celu wyprowadzenia najlepiej dopasowanej funkcji gęstości prawdopodobieństwa (PDF) z uwzględnieniem pierwszych czterech ograniczeń dopasowania momentów. Badanie to pokazuje, że przedstawiona metoda pozwala uzyskać wyższą trafność i skuteczność niż metoda pierwszego rzędu drugiego momentu (FOSM), metoda analizy niezawodności pierwszego rzędu (FORM) czy symulacja Monte Carlo (MCS). Zastosowanie nowej metody zilustrowano na przykładzie manipulatora szeregowego.
    Źródło:
    Eksploatacja i Niezawodność; 2019, 21, 1; 10-20
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An early warning method for a slope based on the increment ratio of anchor cable internal force
    Autorzy:
    Feng, Jianhua
    Chen, Jiaxin
    Li, Jian
    Zhang, Yu
    Guo, Jianhua
    Qiu, Hongyong
    Powiązania:
    https://bibliotekanauki.pl/articles/2203436.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Prestressed anchor cables are active reinforcement to improve slope stability. However, the anchoring is not a permanent guarantee of stability, and the slope retains a potential risk of instability. From the perspective of the internal force of anchor cables, a new early warning method for the safety of the slope is provided, and a slope analysis model is established. With the increase in the strength reduction factor, the internal force increment curves of anchor cables under different prestresses are obtained. The point corresponding to strength reduction factors λ1 and λ2 represents a warning point. Key conclusions are drawn as follows: (1) The internal force of an anchor cable can be used to judge the stability of the slope strengthened by a prestressed anchor cable. (2) A warning index based on the internal force increment ratio of anchor cables is established. (3) The internal force increment ratio of anchor cables eliminates the influence of the initial prestress and is convenient for engineering applications.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 1; 553--569
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model considering residual stiffness and stiffness discontinuity of bolted joints
    Autorzy:
    Wang, Sheng-Ao
    Zhu, Min
    Xu, Zi-Jian
    Guo, Ming
    Li, Biao
    Wu, Fei
    Powiązania:
    https://bibliotekanauki.pl/articles/2087050.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    nonlinear dynamic behaviour
    Iwan model
    energy dissipation
    Opis:
    The nonlinear dynamic behavior has an important impact on energy dissipation and vibra- tion damping characteristics of bolted joints. Firstly, the development of tangential dynamic models is summarized and analyzed. Secondly, a five-parameter Iwan model based on a trun- cated power-law distribution is proposed. The backbone and hysteresis curves are obtained. Thirdly, normalized and dimensionless analysis is performed. On the basis of the above, a more concise four-parameter Iwan model with stiffness continuity is proposed. Finally, the validity of the model is verified by comparing the energy dissipation vs excitation force amplitude curve with the experimental data.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 1; 63--75
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of usefulness of the mems-based integrated navigation unit in car navigation
    Autorzy:
    Uradziński, M.
    Rapiński, J.
    Tomaszewski, D.
    Śmieja, M.
    Guo, H.
    Yu, S.
    Jian, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/298138.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    MEMS
    inertial navigation
    GNSS
    GNSS/IMU integration
    car navigation
    Opis:
    Due to the development of MEMS, there is an opportunity to build a low-cost integrated navigation systems, operating independently of horizon visibility. This paper presents the proposal of an integrated GPS/IMU platform using MEMS technology. In order to verify the performance of a system built at the University of Warmia and Mazury, an experiment was conducted. In this experiment a precise Javad GNSS receiver, commercial grade GPS/IMU XW – ADU5660 and own-built system were used. The experiment was conducted to compare the results obtained from self built device with the working military integrated navigation unit. During the study all three devices were mounted inside moving vehicle. The car drove route inside the Kortowo campus, during which, all equipment performed measurements. Then, the results from both integrated systems were compared with RTK (Real Time Kinematic) results from Javad receiver. Experiments prove that the performance of own device is comparable to the commercial device.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2017, 20(4); 321-331
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Oxygen Reduction Activity of Nitrogen-doped Graphene
    Autorzy:
    Jian-feng, Liu
    Ge, Sun
    Ting, Wang
    Kai, Ning
    Bin-xia, Yuan
    Wei-guo, Pan
    Powiązania:
    https://bibliotekanauki.pl/articles/2174819.pdf
    Data publikacji:
    2022
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Nitrogen Doping
    Graphene
    Oxygen Reduction Activity
    Molecular Simulation
    Opis:
    Graphite nitrogen, pyridine nitrogen and pyrrole nitrogen are the main nitrogen types in nitrogen-doped graphene materials. In order to investigate the mechanism of the oxygen reduction activity of nitrogen-doped graphene, several models of nitrogen-doped graphene with different nitrogen contents and different nitrogen types are developed. The nitrogen content is varied from 1.3 at% to 7.8 at%, and the adsorption energy is calculated according to the established models, then the band gaps are analyzed through the optimization results, so as to compare the mag-nitude of the conductivity. Finally, the oxygen reduction activity of graphite nitrogen-doped graphene (GNG) is found to be better than pyridine nitrogen-doped graphene (PDNG) and pyrrole nitrogen-doped graphene (PLNG) when the nitrogen content is lower than 2.6 at%, and the oxygen reduction activity of PDNG is the best when the nitrogen content was higher than 2.6 at%.
    Źródło:
    Polish Journal of Chemical Technology; 2022, 24, 3; 29--34
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New experimental and computational approaches to the analysis of gene expression
    Autorzy:
    Rafalski, J.
    Hanafey, Mike
    Miao, Guo-Hua
    Ching, Ada
    Lee, Jian-Ming
    Dolan, Maureen
    Tingey, Scott
    Powiązania:
    https://bibliotekanauki.pl/articles/1044751.pdf
    Data publikacji:
    1998
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Źródło:
    Acta Biochimica Polonica; 1998, 45, 4; 929-934
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on new process for separation of silicon wafers and glass from decommissioned photovoltaic module
    Autorzy:
    Zhang, Jian wen
    Wang, Hai dong
    Zhang, Sheng guang
    Liang, Han
    Guo, Hui
    Tao, Si-yao
    Powiązania:
    https://bibliotekanauki.pl/articles/2175425.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    crystalline silicon photovoltaic modules
    decommissioned photovoltaic modules
    silicon
    solar cell
    tempered glass
    vibration separation
    Opis:
    In view of the disadvantages of the existing electrostatic separation process of decommissioned photovoltaic modules, which can only achieve the separation of fine silicon wafers and glass and has high energy consumption, a new process to solve the efficient dry separation of coarse silicon wafers and glass in decommissioned photovoltaic modules is proposed- the vibration separation method. Based on the theoretical analysis of the vibration separation of flaky silicon wafer and polyhedral glass particles, the effects of feed size, feed amount, vibration voltage, vibration frequency, horizontal inclination angle and longitudinal inclination angle on the product indexes of wafer and glass separation were investigated by single factor experiment. The optimal experimental conditions were obtained as follows: feed particle size +0.83mm, feed amount 0.15 t/h, vibration voltage 190 V, vibration frequency 48 Hz, horizontal inclination Angle 8°, longitudinal inclination Angle 3°. Under this optimized condition, the content of metal Si in the obtained silicon wafer product is 84.47%, the recovery rate of is 83.73%, the content of impurity SiO2 is 1.09%, and the content of SiO2 in the obtained glass product is 65.69%, and the recovery rate is 98.95%, the impurity metal Si content is 0.56%. This study provides a research idea for the industrial separation of silicon wafers and glass from decommissioned photovoltaic modules.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 151679
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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