Autor: Wu, F. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: One cabin equipment location method based on the visibility human-factor potential field
Metoda rozmieszczania przyrządów pokładowych oparta na pojęciach potencjałowego pola widoczności oraz potencjałowego pola czynnika ludzkiego
Autorzy:: Ge, Z.
Wu, F.
Yang, Y.
Luo, X.
Tematy:: cabin equipment
human-factor potential field (HFPF)
visibility potential field(VPF)
layout optimization
particle swarm optimization (PSO)
przyrządy pokładowe
potencjałowe pole czynnika ludzkiego (HFPF)
potencjałowe pole widoczności (VPF)
optymalizacja rozmieszczenia
optymalizacja rojem cząstek (PSO); Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Powiązania:: https://bibliotekanauki.pl/articles/301748.pdf Link otwiera się w nowym oknie
Opis:: The visibility is the basic condition for cabin equipment location. For the description of human, object and obstacle, the humanfactor potential field concept is proposed in this paper, concluding the visibility potential field, the reachability potential field. The cabin equipment layout problem is modeled based on the basic visibility potential field model. The optimal layout optimization method is studied based on the particle swarm optimization (PSO) algorithm by natural selection. Finally, the applicability of the proposed idea is illustrated by numerical studies.
Widoczność jest podstawowym warunkiem przy projektowaniu rozmieszczenia przyrządów pokładowych. W przedstawionej pracy zaproponowano pojęcie potencjałowego pola czynnika ludzkiego (human-factor potential field, HFPF), które służy do opisu czynnika ludzkiego, przedmiotów oraz przeszkód. HFPF obejmuje pojęcia potencjałowego pola widoczności oraz potencjałowego pola dostępu. Problem umiejscowienia elementów wyposażenia kabiny zamodelowano na podstawie podstawowego modelu potencjałowego pola widoczności. Metodę optymalizacji rozmieszczenia elementów wyposażenia badano w oparciu o algorytm optymalizacji rojem cząstek (PSO), metodą naturalnej selekcji. Zastosowanie proponowanej koncepcji zilustrowano na przykładzie badań numerycznych.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Ergonomics Hazards Analysis of Linemen’s Power Line Fixing Work in China
Autorzy:: Yu, M.
Sun, L.
Du, J.
Wu, F.
Tematy:: ergonomics
hazards
linemen
musculoskeletal disorders; Pokaż więcej
Wydawca:: Centralny Instytut Ochrony Pracy
Powiązania:: https://bibliotekanauki.pl/articles/91236.pdf Link otwiera się w nowym oknie
Opis:: This study used qualitative and quantitative methods, such as OWAS (Ovako working posture analysis system) and behavior observation, to analyze musculoskeletal disorder (MSD) risk factors of power line fixing work in China. Video-based sampling was used to record and analyze the frequency and posture of on-pole activities. Those key subtasks showed ergonomics characteristics of on-pole fixing tasks. Insulator-fixing was the longest subtask (33% of total working time). Bar-installing was the second longest (26% of total working time). It was evident that bar-installing and insulator-fixing were full of hazardous risks. The action categories of the 2 subtasks were higher than of the other ones. The 2 subtasks were also time-consuming, difficult and induced MSDs. Assistant linemen faced more hazardous factors than chief linemen.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The Static Unbalance Analysis and Its Measurement System For Gimbals Axes of an Inertial Stabilization Platform
Autorzy:: Yang, H.
Zhao, Y.
Li, M.
Wu, F.
Tematy:: inertial stabilization platform
mass eccentricity
angular position turntable
dynamical model
least-square fitting; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/221513.pdf Link otwiera się w nowym oknie
Opis:: To reduce the influence of the static unbalance on an infrared missile guidance system, a new static unbalance measure system for the gimbals axes has been developed. Considering the coupling effects caused by a mass eccentricity, the static balance condition and measure sequence for each gimbal axis are obtained. A novel static unbalance test approach is proposed after analyzing the dynamic model of the measured gimbal axis. This approach is to drive the measured gimbal axis to do sinusoidal reciprocating motion in a small angle and collect its drive currents in real time. Then the static unbalance of the measured gimbal axis can be obtained by the current multi-cycle integration. Also a measuring system using the proposed approach has been developed. A balanced simulator is used to verify the proposed approach by the load and repeatability tests. The results show the proposed approach enhances the efficiency of the static unbalance measurement, and the developed measuring system is able to achieve a high precision with a greater stability.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Positron Annihilation Lifetime Analysis of Left- and Right-Handed Alanine Single Crystals
Autorzy:: Eren, B.
Wu, F.
Eren, E.
Jean, Y.
Van Horn, J.
Tematy:: 78.70.Bj
82.30.Gg
34.80.-i
87.15.B-; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1030024.pdf Link otwiera się w nowym oknie
Opis:: Studies of the interaction of polarized light or particles (including electrons, e¯, or positrons, e⁺) with asymmetric forms of matter has been of interest to scientists since the discovery of chirality and the subsequent development of particle physics. Researchers have been interested in e⁺ interactions with chiral molecules for decades, but with mixed and indecisive results. After reviewing the field, we speculated that the e⁺ or positronium (Ps) might interact differently with chiral pairs of large single crystals, i.e., the left-handed or right-handed asymmetric forms of the crystals - and subsequently observed significant differences in "free positron" annihilation and intensities in the evaluation of left-handed or right-handed quartz single crystals. This result may be understood to be a "particle stereorecognition" phenomenon. To extend this line of inquiry we crystallized mm scale L- or D-alanine crystals and performed positron annihilation lifetime spectroscopy measurements using a ²²Na positron source. Alanine crystals were obtained via slow evaporation of water in a Dewar, or from water/acetone solvent in a temperature-controlled environment. These methods resulted in small ( ≈0.5 cm/side) or large ( ≥1.0 cm/side) crystals, respectively. While some intensity (I₂) results from left-handed and right-handed crystals varied in positron annihilation lifetime spectroscopy analysis, the errors associated with the measurements do not indicate a stereorecognition of alanine via positron interactions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Endotoxin and beta-[1,3]-glucan levels in automobiles: a pilot study
Autorzy:: Wu, F F -S
Wu, M.-W.
Chang, C.-F.
Lai, S.-M.
Pierse, N.
Crane, J.
Siebers, R.
Tematy:: endotoxin
glucan
beta-[1,3]-glucan level
respiratory health
non-occupational source
indoor environment
automobile
asthmatic patient
respiratory symptom
exposure; Pokaż więcej
Wydawca:: Instytut Medycyny Wsi
Powiązania:: https://bibliotekanauki.pl/articles/49259.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Demonstration of a new indicator for studying upwelling in the Northern South China Sea
Autorzy:: Lin, L.
Wang, Y.-S.
Sun, C.-C.
Li, N.
Wang, H.
Mitchell, B.G.
Wu, M.-L.
Song, H.
Wu, J.-F.
Tematy:: China Sea
cluster analysis
multivariate statistical analysis
principal component analysis
remote sensing
satellite monitoring
sea surface temperature
silicate
spatial distribution
upwelling; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Powiązania:: https://bibliotekanauki.pl/articles/48889.pdf Link otwiera się w nowym oknie
Opis:: In order to demonstrate that silicate (SiO3-Si) can be used as an indicator to study upwelling in the northern South China Sea, hierarchical cluster analysis (CA) and principle component analysis (PCA) were applied to analyse the metrics of the data consisting of 14 physical-chemical-biological parameters at 32 stations. CA categorized the 32 stations into two groups (low and high nutrient groups). PCA was applied to identify five Principal Components (PCs) explaining 78.65% of the total variance of the original data. PCA found important factors that can describe nutrient sources in estuarine, upwelling, and non-upwelling areas. PC4, representing the upwelling source, is strongly correlated to SiO3-Si. The spatial distribution of silicate from the surface to 200 m depth clearly showed the upwelling regions, which is also supported by satellite observations of sea surface temperature.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Towards the building information modeling-based capital project lifecycle management in the luxury yacht industry
Autorzy:: Liu, F.
Chen, C.
Wu, W.
Tematy:: building information modelling
luxury yacht
communication
interoperability
capital
project lifecycle management
framework; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259822.pdf Link otwiera się w nowym oknie
Opis:: It will be a new approach that BIM’s capital project lifecycle management (CPLM) applied to the yacht industry. This paper explored the feasibility of applying the principles and rationales of BIM for capital project lifecycle management in luxury yacht design, engineering, fabrication, construction and operation. The paper examined the premises and backbone technology of BIM. It then evaluated leading naval engineering and shipbuilding software applications and their development trends from the functional lens of BIM. To systematically investigate a BIM-based approach for capital project lifecycle management (CPLM) in the luxury yacht industry, the paper proposed and outlined an implementation framework. A case study and a student competition use case were discussed to delineate the core constituents and processes of the proposed framework. The case of BIM was reviewed. Through the domestic custom luxury yacht design and prototyping student competition, the application of this framework in educational research is demonstrated and the initial quantitative assessment of the framework is carried out. Conclusions: a BIM-based CPLM implementation framework can help the luxury yacht industry capitalize on the global transformation to an information-centric and data-driven new business paradigm in shipbuilding with integrated design, manufacturing and production.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Numerical analysis of controlling separation in axial cascades by excitation of periodical incoming wake
Autorzy:: Liu, F.
Wang, J.
Wu, K.
Tematy:: unsteady excitation
compressor cascade
separation control
incoming wake
vortex shedding; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1933188.pdf Link otwiera się w nowym oknie
Opis:: Numerical analysis has been performed of time-space structures in a large turning angle axial cascade subject to unsteady incoming wake excitation. The results have shown that intentional unsteady excitation could increase the cascade's time-averaged performance. As a result, the vortex structures corresponding to the external exciting frequency are strengthened and other disordered vortices are involved, so that the separation structures of the suction surface are translated from disorder to order. Two interaction regimes between incoming periodic wakes and separation structures are analyzed, indicating that turbulent kinetic energy can enhance momentum interchange and that wave-vortex resonance can promote rolled-up and plus-minus pairing of vortices. Based .on these, responses of separation structures from two periodic incoming wake regimes are compared. The feasibility of far-field noise reduction in ducting fans by using periodic incoming wake is considered.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Efficiency comparison between the LLCL and LCL-filters based single-phase grid-tied inverters
Autorzy:: Wu, W.
Huang, M.
Blaabjerg, F.
Tematy:: LCL filter
LLCL-filter
efficiency power loss
modulation
single-phase grid-tied inverter; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/140537.pdf Link otwiera się w nowym oknie
Opis:: An LLCL-filter is becoming more attractive than an LCL-filter as the interface between the grid-tied inverter and the grid due to possibility of reducing the copper and the magnetic materials. The efficiency of the LLCL-filter based single-phase grid-tied inverter also excites interests for many applications. The operation of the switches of the VSI is various with different modulation methods, which lead to different efficiencies for such a single-phase grid-tied inverter system, and therefore important research has been carried out on the effect of the choice of PWM schemes. Then power losses and efficiencies of the LLCL-filter and the LCL-filter based single-phase grid-tied inverters are analyzed and compared under the discontinuous unipolar, the dual-buck and the bipolar modulations. Results show that the efficiency of LLCL-filter based inverter system is higher than the LCL- filter based independent on the modulation method adopted. Experiments on a 2 kW prototype are in good agreement with results of the theoretical analysis.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The Bohr compactification, modulo a metrizable subgroup
Autorzy:: Comfort, W.
Trigos-Arrieta, F.
Wu, S.
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Powiązania:: https://bibliotekanauki.pl/articles/1208589.pdf Link otwiera się w nowym oknie
Opis:: The authors prove the following result, which generalizes a well-known theorem of I. Glicksberg [G]: If G is a locally compact Abelian group with Bohr compactification bG, and if N is a closed metrizable subgroup of bG, then every A ⊆ G satisfies: A·(N ∩ G) is compact in G if and only if {aN:a ∈ A} is compact in bG/N. Examples are given to show: (a) the asserted equivalence can fail in the absence of the metrizability hypothesis, even when N ∩ G = {1}; (b) the asserted equivalence can hold for suitable G and N with N closed in bG but not metrizable; (c) an Abelian group may admit two topological group topologies U and T, with U totally bounded, T locally compact,U ⊆ T, with U and T sharing the same compact sets, and such that nevertheless U is not the topology inherited from the Bohr compactification of ⟨ G, T⟩. There are applications to topological groups of the form kG for G a totally bounded Abelian group.
Dostawca treści:: Biblioteka Nauki

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