Wyniki wyszukiwania - BazTech

1

Use of fuzzy fault tree analysis and noisy-OR gate bayesian network for navigational risk assessment in Qingzhou Port

Zhao C., Wu B., Yip T. L., Lv J.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2021

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Vol. 15 No. 4

765--771

EN

Collisions and groundings account for more than 80% among all types of maritime accidents, and risk assessment is an essential step in the formal safety assessment. This paper proposes a method based on fuzzy fault tree analysis and Noisy-OR gate Bayesian network for navigational risk assessment. First, a fault tree model was established with historical data, and the probability of basic events is calculated using fuzzy sets. Then, the Noisy-OR gate is utilized to determine the conditional probability of related nodes and obtain the probability distribution of the consequences in the Bayesian network. Finally, this proposed method is applied to Qinzhou Port. From sensitivity analysis, several predominant influencing factors are identified, including navigational area, ship type and time of the day. The results indicate that the consequence is sensitive to the position where the accidents occurred. Consequently, this paper provides a practical and reasonable method for risk assessment for navigational accidents.

2

Novel Green Dyeing Process of Soybean Protein/Poly(vinyl alcohol) Blend Fibre

Lv J., Zhou Q., Gao D., Liu G., Wang C.

Fibres & Textiles in Eastern Europe

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2015

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Vol. 23, no. 5 (113)

55--59

EN

A water-soluble chitosan derivative N-[(2-hydroxy-3-trimethylammonium)propyl] chitosan chloride (HTCC) was prepared and used for the modification of soybean protein/poly (vinyl alcohol) blend fiber (SPF). The dying properties of modified SPF with Cibacron FN series reactive dyes were discussed in relation to a salt-free and alkaline/acidic denaturalization dyeing bath (green dyeing process). Results showed that dye exhaustion in the green dyeing process was obviously higher than that in the conventional dyeing process, despite the addition of a large amount salt in the latter case. However, the washing fastness of SPF treated with HTCC in the green dyeing process was inferior to that of untreated SPF in the conventional dyeing process. COD (chemical oxygen demand) values of the green dyeing process effluent were found to be decreased compared with conventional dyeing effluent, which indicated that the green dyeing process could decrease the amount of toxicity of dyeing effluent remarkably.

PL

Przygotowano rozpuszczalną w wodzie mieszankę pochodnej chitozanu - chlorek N-[(2-hydroksy-3-trimetyloamono)propylo] chitozanu (HTCC). Zastosowano ją dla modyfikacji mieszanki sojowych włókien proteinowych z PVA. Następnie badano właściwości barwienia zmodyfikowanych włókien za pomocą barwników reaktywnych Cibacron seria FN zastosowanych w kąpieli bezsolnej i zasadowo/kwasowej denaturalizacyjnej kąpieli (ekologiczny proces barwienia). Wyniki wskazały, że wyczerpanie barwnika w procesie ekologicznego barwienia było zasadniczo wyższe niż to przy barwieniu konwencjonalnym, niezależnie od dodatku dużej ilości soli w tym ostatnim. Jednakże odporność na pranie włókien barwionych w procesie ekologicznym była niższa w stosunku do procesu konwencjonalnego. Stwierdzono że wartość COD (chemiczne zapotrzebowanie tlenu) w przypadku ścieków z ekologicznego barwienia była niższa w porównaniu do ścieków z barwienia konwencjonalnego, co wskazuje, że proces ekologicznego barwienia może w znacznym stopniu zmniejszyć toksyczność ścieków.

3

Synthesis and Characterization of a High Energy Combustion Agent (BHN) and Its Effects on the Combustion Properties of Fuel Rich Solid Rocket Propellants

Pang W.-Q., Zhao F.-Q., Xue Y.-N., Xu H.-X., Fan X.-Z., Xie W.-X., Zhang W., Lv J., Deluca L. T.

Central European Journal of Energetic Materials

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2015

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Vol. 12, no. 3

537--552

EN

A high energy combustion agent (tetraethylammonium decahydrodecaborate, BHN) was prepared by means of an ion exchange reaction (IER), and the prepared samples were characterized by the advanced diagnostic techniques of Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Thermogravimetric Analysis (TGA), and Differential Scanning Calorimetry (DSC) etc. The effects of BHN particles on the hazard and combustion properties of fuel rich solid propellants were investigated. The results showed that the BHN samples and fuel rich propellants containing BHN particles can be prepared successfully and solidified safely. The peak temperature of thermal decomposition and the heat of decomposition of the BHN samples prepared were 305.8 °C and 210.9 J•g-1 at a heating rate of 10 K•min-1, respectively. The burning rate and pressure exponent of fuel rich solid propellants decreases with increases in the fraction of BHN particles in the propellant formulation. Compared with the reference formulation (sample BP-1), the burning rate of the propellant with 10% mass fraction of BHN particles (sample BP-4) had decreased 30% at 3.0 MPa, and the pressure exponent had dropped from 0.44 to 0.41.

4

Experimental study on fracture process of concrete by acoustic emission technology

Yang Y., Zhang L., Lv J., Wang C.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 9b

55-58

EN

Acoustic emission is a method widely used for real time monitoring of the structural condition of materials. In this paper, the uniaxial compression tests will be carried out to acquire the correlation between the characteristics of acoustic emission signals and that of the concrete strength parameter. In the fracture process of concrete, acoustic emission, which is detected by the sensors, is generated when part of the strain energy stored in the samples is rapidly released. In order to analyze the results of experiments better, the acoustic emission event rate and the strain curve are applied. The results show that the concrete strength has an important impact on acoustic emission signals: for low-strength concrete, the acoustic emission event rate columns of fracture process are divided into six stages, and display a clear "bimodal" distribution, but such phenomenon does not appear in high-strength concrete.

PL

W artykule zaprezentowano testy określające korelację między sygnałem emisji akustycznej a parametrami betonu. Badano sygnał emisji akustycznej towarzyszący pękaniu betonu.