Autor: Ma, W. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Simulation on vessel intelligent collision avoidance based on artificial fish swarm algorithm
Autorzy:: Li, W.
Ma, W.
Tematy:: simulation
collision avoidance
artificial fish swarm algorithm; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/260153.pdf Link otwiera się w nowym oknie
Opis:: TAs the rapid development of the ship equipments and navigation technology, vessel intelligent collision avoidance theory was researched world widely. Meantime, more and more ship intelligent collision avoidance products are put into use. It not only makes the ship much safer, but also lighten the officers work intensity and improve the ship’s economy. The paper based on the International Regulation for Preventing Collision at sea and ship domain theories, with the ship proceeding distance when collision avoidance as the objective function, through the artificial fish swarm algorithm to optimize the collision avoidance path, and finally simulates overtaking situation, crossing situation and head-on situation three classic meeting situation of ships on the sea by VC++ computer language. Calculation and simulation results are basically consistent with the actual situation which certifies that its validity.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Observations on seasonal dynamics in diet composition of the field vole, Microtus agrestis, with some methodological remarks
Autorzy:: Ma, W.
Faber, J.
Powiązania:: Acta Theriologica
Opis:: The field vole, Microtus agrestis, was studied with regard to diet composition throughout the year. Vole populations were sampled in two grassland habitats, and stomach contents of captured animals were examined microscopically. The composition of the diet varied with season, both qualitatively and quantitatively.
Dostawca treści:: RCIN - Repozytorium Cyfrowe Instytutów Naukowych

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Skocz do pozycji: 3.

Tytuł:: A novel process of dye wastewater treatment by linking advanced chemical oxidation with biological oxidation
Autorzy:: Zou, H.
Ma, W.
Wang, Y.
Tematy:: dye wastewater
Fenton's oxidation
biological oxidation
biological aerated filter
advanced oxidation processes; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/204846.pdf Link otwiera się w nowym oknie
Opis:: Dye wastewater is one of typically non-biodegradable industrial effluents. A new process linking Fenton’s oxidation with biological oxidation proposed in this study was investigated to degrade the organic substances from real dye wastewater. During the combination process, the Fenton’s oxidation process can reduce the organic load and enhance biodegradability of dye wastewater, which is followed by biological aerated filter (BAF) system to further remove organic substances in terms of discharge requirement. The results showed that 97.6% of chemical oxygen demand (COD) removal by the combination process was achieved at the optimum process parameters: pH of 3.5, H₂₂
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Research on interaction of APFs based on relative gain array
Autorzy:: Feng, X.
Sun, T.
Ma, W.
Tematy:: interaction effect
relative gain array
active power filter
Norton equivalent
LCL filter; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/141523.pdf Link otwiera się w nowym oknie
Opis:: Different APFs (Active Power Filter) interact with each other when multiple APFs are connected to the grid, and the interactions deteriorate the control performance of APFs and even lead to system instability. This paper presents a method to analyze the dynamic interaction of multiple APFs in a weak grid. This method uses the Norton equivalent principle to establish the mathematical model of a single APF. The mathematical model of the multiple APFs connected to the grid is set up based on the single APF mode. The RGA (Relative Gain Array) principle is used to analyze the interactions among multiple APFs. Besides, this paper analyzes the effect of changing circuit parameters and controller parameters on the change of the interactions. The strategy of weakening and eliminating the interaction is proposed based on rational selection and combination of parameters. Analysis, along with time domain simulation and experimental results, is presented to verify the feasibility and effectiveness of the proposed method and strategy.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Test studies of the resistance and seakeeping performance of a trimaran planing hull
Autorzy:: Ma, W.
Sun, H.
Zou, J.
Zhuang, J.
Tematy:: trimaran planing hull
appendix
resistance
seakeeping
model test; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259495.pdf Link otwiera się w nowym oknie
Opis:: Towing tank tests in calm water were performed on a trimaran planing hull to verify its navigational properties with different displacements and centres of gravity, as well as to assess the effects of air jets and bilge keels on the hull’s planing capabilities, and to increase the longitudinal stability of the hull. Hydrostatic roll tests, zero speed tests, and sea trials in the presence of regular waves were conducted to investigate the hull’s seakeeping ability. The test results indicate that the influence of the location of the centre of gravity on the hull resistance is similar to that of a normal trimaran planing hull; namely, moving the centre of gravity backward will reduce the resistance but lower the stability. Bilge keels improve the longitudinal stability but slightly affect the resistance, and the presence of air jets in the hull’s channels decreases the trim angle and increases heaving but has little effect on the resistance. Frequent small-angle rolling occurs in waves. The heaving and pitching motions peak at the encounter frequency of , and the peaks increase with velocity and move towards greater encounter frequencies. When the encounter frequency exceeds, the hull motion decreases, which leads to changes in the navigation speed and frequency.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Test research on the resistance performance of high-speed trimaran planing hull
Autorzy:: Ma, W.
Sun, H.
Zou, J.
Yang, H.
Tematy:: trimaran planing hull
side hulls
high speed
step
resistance
model test; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259708.pdf Link otwiera się w nowym oknie
Opis:: In order to identify high-speed navigation ability of trimaran planing hull, as well as investigate the characteristics of its resistance and hull form, ship model tests were conducted to measure resistance, trim and heaving under different displacements and gravity centre locations. The test results were then used to study the influence of spray strips on resistance and sea-keeping qualities. Moreover, different planning surfaces were compared in the model tests which helped to look into influence of steps on hull resistance and its moving position. Also, the resistance features of monohull and trimaran planing hulls, both with and without steps, were compared to each other. From the tests it can be concluded that: the two auxiliary side hulls increase aerodynamic lift at high-speed motion, which improves the hydrodynamic performance; the trimaran planing hull has also excellent longitudinal stability and low wave-making action; when Fr∇> 8, its motion is still stable and two distinct resistance peaks and two changes of sailing state (the second change is smaller) appear; spray strips are favourable for sea-keeping qualities at high speed. The change trends before the second resistance peak as to the resistance and sailing behaviour of trimaran planing hull without steps are the same as for monohull planing hull without steps. but when steps in both hulls exist the change trends are different; more specifically: trimaran planing hull with steps has only one resistance peak and its resistance increases along with its speed increasing, and the resistance is improved at the increasing speed as the number of steps increases.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The multiple dimension of water in the designing and governance of public spaces. The case of Shanghai West Bund Project compared to other Western Waterfronts renovations
Autorzy:: Semprebon, G.
Ma, W.
Fabris, L. M. F.
Tematy:: Shanghai
West Bund
waterfront
urban regeneration
Szanghaj
nabrzeże
rewitalizacja obszarów miejskich; Pokaż więcej
Wydawca:: Politechnika Krakowska im. Tadeusza Kościuszki. Wydział Architektury. Katedra Kształtowania Środowiska Mieszkaniowego
Powiązania:: https://bibliotekanauki.pl/articles/344724.pdf Link otwiera się w nowym oknie
Opis:: In 2010, the municipality of Shanghai started the “Huangpu River Comprehensive Development Plan”, a large regeneration initiative including the Expo site, targeted to revitalize the river banks and generally the urban environment, making Xuhui waterfront one of the six key construction areas of the 12th Five-Year Plan in Shanghai. Formerly one of the largest industrial districts, the so-called West Bund area has experienced a process of substantial transformation, currently still ongoing. Particular attention has been paid to the rehabilitation of the riverside, as a source of landscape enhancement, providing a system of open spaces and public facilities able to meet the dweller’s demands and to attract touristic fluxes. For this reason, the West Bund Project represents one of the most relevant regeneration initiative currently taking place in Shanghai. This paper aims to investigate, starting from this specific case-study, the role of water in the definition of cultural and natural elements, revealing new perspectives for the revitalization of the urban environment.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Właściwości antykorozyjne żywic styrenowo-akrylowych zawierających tripolifosforan glinu
Anticorrosive properties of styrene-acrylic resins containing aluminum tripolyphosphate
Autorzy:: Shangguan, L. J.
Ma, W.
Liu, G.
Song, W.
Tematy:: żywice styrenowo-akrylowe
tripolifosforan glinu
właściwości antykorozyjne
otrzymywanie
styrene-acrylic resins
aluminum tripolyphosphate
anticorrosive properties
preparation; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Powiązania:: https://bibliotekanauki.pl/articles/142544.pdf Link otwiera się w nowym oknie
Opis:: Tripolifosforan glinu zdyspergowano w emulsji styrenowo-akrylowej. Rozkład i wielkości cząstek lateksu badano za pomocą laserowego analizatora cząstek. Właściwości antykorozyjne układu żywice styrenowo-akrylowe – tripolifosforan glinu badano za pomocą elektrochemicznej spektroskopii impedacyjnej (EIS), próby w komorze solnej według normy ASTM B-117 oraz testów adhezji. Wyniki wskazują na wzmocnienie działania ochronnego żywic styrenowo-akrylowych po dodaniu tripolifosforanu glinu.
Aluminum tripolyphosphate was introduced into the dispersion solution of styrene-acrylic emulsion The laser particle size analyzer was used to analyse the distribution and particles size of the latex particle. The anticorrosion performance of styrene-acrylic resins/aluminum tripolyphosphate was studied using electrochemical impedance spectroscopy (EIS), salt spray standard test according to ASTM B-117 and adhesion tests. The results indicated the protective performance of styrene-acrylic resins was improved by adding aluminum tripolyphosphate.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Numerical simulations of linearly stratified flow past submerged bodies
Autorzy:: Ma, W.
Li, Y.
Ding, Y.
Hu, K.
Lan, L.
Tematy:: stratified flow
circular cylinder
internal wave
Suboff
equation of state; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/259150.pdf Link otwiera się w nowym oknie
Opis:: In this study, a methodology was presented to predict density stratified flows in the near-field of submerged bodies. The energy equation in temperature form was solved coupled with momentum and mass conservation equations. Linear stratification was achieved by the definition of the density as a function of temperature. At first, verifications were performed for the stratified flows passing a submerged horizontal circular cylinder, showing excellent agreement with available experimental data. The ability of the method to cope with variable density was demonstrated. Different turbulence models were used for different Re numbers and flow states. Based on the numerical methods proposed in this paper, the stratified flow was studied for the real scale benchmark DAPRA Suboff submarine. The approach used the VOF method for tracing the free surface. Turbulence was implemented with a k − ω based Detached Eddy Simulation (DES) approach. The effects of submarine speed, depth and density gradient on the free surface wave pattern were quantitatively analyzed. It was shown that, with the increasing of the speed of the submarine, the wavelength and wave height of the free surface wave were gradually increasing. The wave height of the free surface wave was gradually reduced as the submarine’s depth increased. Relative to the speed and submarine depth, the changes of the gradient density gradient have negligible effects on the free surface wave field.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Motion prediction of catamaran with a semisubmersible bow in wave
Autorzy:: Sun, H.
Jing, F.
Jiang, Y.
Zou, J.
Zhuang, J.
Ma, W.
Tematy:: SSB catamaran
model test
overset grid
motion region
motion response; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/258596.pdf Link otwiera się w nowym oknie
Opis:: Compared with standard vessels, a slender catamaran with a semi-submerged bow (SSB) demonstrates superior seakeeping performance. To predict the motion of an SSB catamaran, computational fluid dynamics methods are adopted in this study and results are validated through small-scale model tests. The pitch, heave, and vertical acceleration are calculated at various wavelengths and speeds. Based on the overset grid and motion region methods, this study obtains the motion responses of an SSB catamaran in regular head waves. The results of the numerical studies are validated with the experimental data and show that the overset grid method is more accurate in predicting the motion of an SSB catamaran; the errors can be controlled within 20%. The movement data in regular waves shows that at a constant speed, the motion response initially increases and then decreases with increasing wavelength. This motion response peak is due to the encountering frequency being close to the natural frequency. Under identical sea conditions, the motion response increases with the increasing Froude number. The motion prediction results, that derive from a shortterm irregular sea state, show that there is an optimal speed range that can effectively reduce the amplitude of motion.
Dostawca treści:: Biblioteka Nauki

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