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1

Research on SDG fault diagnosis of ocean shipping boiler system based on fuzzy granular computing under data fusion

Zhu Y., Geng L.

Polish Maritime Research

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2018

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S 2

92--97

EN

The research work in this paper belongs to the application of granular computing, graph theory and its application in fault detection and diagnosis. It is a cross cutting and frontier research field in computer science, information science and graph theory. The results of this paper are of great significance to the application of the fault detection and diagnosis of the ocean boilers system. This research combines granular computing theory and signed directed graph, and proposes a new method of fault diagnosis, and applies it to the fault diagnosis of ocean ship boiler system.

2

Experiment and prediction of water content of sour natural gas with an modified cubic plus association equation of state

Liu Y., Zhu Y., Zhu J.

Polish Journal of Chemical Technology

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2018

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Vol. 20, nr 2

98--106

EN

In this work, new experimental value for water content in sour natural gas were reported. In addition, to predict the water content in sour natural gas, a modified cubic plus association equation of state (CPA-EoS) was also proposed. In this model, a new energy parameter a was proposed to make an accurate description of saturated liquid density. Additionally, a temperature dependent binary interaction parameter kij for six binary systems was also obtained. Lastly, a comparison between the prediction results of the modified CPA-EoS and the experimental data was presented, and the results showed that the modifi ed CPA-EoS could predict the water content in sour natural gas with high accuracy, which has an AAD of 3.6722% with experimental data in literatures and an AAD of 1.946% for experimental data reported in this work.

3

The effect of polyacrylic acid on the surface properties of calcite and fluorite aiming at their selective flotation

Zhang C., Gao Z., Hu Y., Sun W., Tang H., Yin Z., He J., Guan Q., Zhu Y.

Physicochemical Problems of Mineral Processing

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2018

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Vol. 54, iss. 3

868--877

EN

In this study, the polyacrylic acid (PAA) was studied as a selective depressant for calcite in the selective flotation of fluorite and calcite, and the implications of this process for the separation of fluorite ore were studied using micro-flotation tests, and the results were analyzed with Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses. The flotation tests indicated that the preferential adsorption of PAA onto calcite rather than sodium oleate (NaOl) could selectively depress the flotation of calcite, allowing its separation from fluorite at pH 7. The zeta potential of calcite became more negative with the addition of PAA rather than with NaOl. However, the characteristic features of PAA adsorption were not observed for fluorite, suggesting that NaOl preferentially adsorbed on the surface of fluorite, or that PAA could be replaced by NaOl on the fluorite surface. FT-IR and XPS analysis were utilized to obtain a better understanding of the mechanism by which PAA was more strongly adsorbed on the calcite surface than NaOl. This was revealed to occur through chemical bonding between the carboxyl group of PAA and the hydroxyl groups of the Ca species on the calcite surface, modifying the structure of the adsorbed layer. A possible adsorption mechanism, along with a postulated adsorption mode for the surface interaction between PAA and calcite, is proposed.

4

Selective flotation of siderite and quartz from a carbonate-containing refractory iron ore using a novel amino-acid-based collector

Gu X., Zhu Y., Li Y., Han Y.

Physicochemical Problems of Mineral Processing

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2018

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Vol. 54, iss. 3

803--813

EN

A novel and highly-efficient amino-acid-based collector, α-ethylenediamine lauric acid (α-EDA-LA), was studied to selectively beneficiate carbonate-containing refractory hematite ores. Single mineral and synthetic mixture flotation tests were carried out to investigate its floating performance. Zeta potential, fourier transform infrared spectroscopy (FTIR) and Density Functional Theory-based molecular simulation were used to identify the adsorption mechanism. The flotation results showed that quartz could be collected effectively at pH 11.0-12.0 in the reverse flotation. For siderite, the recovery peaked at 83.4% at pH 8.0, where siderite presented different floatability from magnetite and hematite. Exploiting such difference, the separation of siderite could be achieved. Zeta-potential measurements showed that α-EDA-LA adsorption on the surfaces of siderite and quartz decreased the corresponding zeta potentials at pH of 8.0-10.0 and 8.0-12.0, respectively. This means the adsorption overcome the electrostatic repulsion between α-EDA-LA and the mineral surfaces. The molecular simulation indicated that no chemisorption took place between α-EDA-LA and quartz. FTIR analysis suggested that α-EDA-LA was adsorbed on quartz via hydrogen bonding. The adsorption of α-EDA-LA on siderite surface was dominated by chemisorption, while further enhanced by hydrogen bonding. This study filled the gap in the research on siderite flotation reagents and its adsorption mechanism.

5

Flotation behavior and separation mechanism of quartz and iron minerals in α-bromolauric acid reverse flotation system

Han Y., Guo W., Zhu Y., Wei Y., Gu X.

Physicochemical Problems of Mineral Processing

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2018

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Vol. 54, iss. 3

992--1003

EN

A new type collector α-Bromolauric acid (α-BLA) had been proved to be an efficient collector for quartz flotation. However, the effects of α-BLA on the flotation behavior of iron minerals and quartz-iron separation had not been investigated. In this study, collector α-BLA was synthesized in the laboratory. The flotation behavior of quartz, hematite and magnetite under α-BLA reverse flotation system were investigated and the separation mechanism of quartz-irons was studied by contact angle, zeta-potential and infrared spectroscopy. The results showed that the optimum flotation pH was 11.5 for quartz, 6.45 for hematite and 6.97 for magnetite. The best α-BLA concentrations was 75 mg/dm3 for quartz flotation, 125 mg/dm3 for hematite and magnetite flotation. The activator CaCl2 had little effect on the flotation of hematite and magnetite, but the minimum dosage 50 mg/dm3 of activator CaCl2 was necessary for quartz flotation. On the contrary, starch had no effect on the flotation of quartz, while the recoveries of magnetite and hematite tended to be 0% as starch concentration more than 80 mg/dm3. The separation mechanism of quartz from iron minerals under α-BLA reverse flotation system was that the starch could be selectively adsorbed on the surface of hematite and magnetite in the form of strong hydrogen bond adsorption. However, the same adsorption of starch did not occur on the surface of quartz, so the α-BLA can be successfully adsorbed on the surface of activated quartz to make the quartz strongly hydrophobic, and then to be floated out.

6

Influence of Bismuth Complex Catalysts on the Cure Reaction of Hydroxyl-terminated Polyether-based Polymer Bonded Explosives

Ou Y., Jiao Q., Yan S., Zhu Y.

Central European Journal of Energetic Materials

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2018

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Vol. 15, no. 1

131--149

EN

The kinetics of catalyzed urethane-forming reactions of hydroxyl-terminated polyether (HTPE) with toluene di-isocyanate (TDI) in the presence of bismuth complex catalysts was investigated by non-isothermal differential scanning calorimetry (DSC). Fourier transform infrared spectroscopy (FTIR) was employed to monitor the chemical interactions of relevant groups. The kinetic parameters, including the apparent activation energy (Ea) and reaction rate constants (k) at typical temperatures calculated by the Kissinger and Crane methods, were used to evaluate the catalytic activities of triphenylbismuth (TPB) and tris(3-ethoxyphenyl)bismuthine (TEPB). The variations of Ea were studied to obtain an insight into the consistency of catalytic mechanism for the bismuth complex catalysts. The viscosity build-up of HTPE-based polymer bonded explosive (PBX) slurry was then measured to verify the catalytic activity and the pot-life during an actual manufacturing process, which fitted with the kinetics of the catalyzed cure reaction. The cure process was evaluated by the hardness of the PBX grains maintained at a temperature below typical manufacturing conditions. The results showed that TEPB is an effective catalyst, reducing the Ea of the cure reaction and the manufacturing temperature and time with an acceptable pot-life. The mechanical, thermal characteristics and compatibility of the HTPE-based PBXs were also investigated. The results suggest that TEPB is compatible with HTPE-based PBXs and contributes to improving the mechanical properties and thermal safety.

7

Simultaneous quantitative determination of active components in Tetrastigma hemsleyanum by RP-HPLC coupled with diode array detection

Zhu Y., Yin Q., Du P., Huang S., Yang Y.

Acta Chromatographica

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2018

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Vol. 30, no. 3

186--190

EN

An effective, reliable, and sensitive reversed-phase high-performance liquid chromatography (RP-HPLC) with diode array detector (DAD) method was investigated for simultaneous determination of polydatin, isoquercitrin, resveratrol, and nicotiflorin in Tetrastigma hemsleyanum. The chromatographic separation of the four compounds was carried out on a Welchrom ODS column (4.6 mm × 250 mm, 5 μm) by gradient elution with phosphoric acid (H3PO4) aqueous solution (0.4%)–methanol as the mobile phase, at the temperature of 30 °C and a flow rate of 1.0 mL/min. The detection wavelength was set at 270 nm. Under optimum conditions, the baseline separation of these four compounds can be performed within 30 min. The developed method was validated in terms of detection limit, quantification limit, linearity, precision, and recovery tests. Eventually, the established HPLC–DAD method was successfully applied to the simultaneous determination of polydatin, isoquercitrin, resveratrol, and nicotiflorin in the extract of herb T. hemsleyanum.

8

An analytical solution for dynamic response of water barrier subjected to strong shock waves caused by an underwater explosion to dams

Lu L., Zou D., Zhu Y., Dong Y., Zuo C., Wu Y.

Polish Maritime Research

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2017

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S 2

111--117

EN

Shock waves arriving at a dam site are close to plane waves when the center of an underwater explosion is far from the dam site. In general, the wave pressure is calculated with COLE empirical formula. The COLE formula is a negative exponential function with respect to time. In this paper, a new analytical solution algorithm is proposed, which does not require the use of step-by-step time integration. In Comparison with the step-by-step time integration, the proposed algorithm requires relatively less calculation and avoids high-frequency oscillation. Furthermore, the vertical upstream surface and the sloping upstream surface in two types of the dams are analyzed in this paper. The research results indicate that the analytical solution can be applied for a dam with a vertical upstream surface. However, because the upstream face of a dam is inclined, the analytical solution can be obtained only for dams that are at lower height. Whenever the height of a dam is higher, then no analytical solution can be obtained, and only the use of step-by-step time integration can obtain a solution.

9

Zinc oxide nanoparticles for improvement of thin film photovoltaic structures’ efficiency through down shifting conversion

Znajdek K., Sibiński M., Lisik Z., Apostoluk A., Zhu Y., Masenelli B., Sędzicki P.

Opto-Electronics Review

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2017

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Vol. 25, No. 2

99--102

EN

The paper presents the idea to improve the performance of thin film photovoltaic cells by a light capture enhancement through the introduction of down shifting energy converters. Luminescent down shifting layers convert high-energy photons (UV light) into low-energy ones (visible light), which are more efficient in a photovoltaic conversion. For this purpose, the application of a thin layer composed of zinc oxide(ZnO) nanoparticles deposited onto a thin film solar cell is proposed. The paper presents both experimental and theoretical results of this approach. Conducted investigations include an analysis of ZnO nanoparticle layers, deposited in two independent technology methods. The results showed that ZnO nanoparticles have a great potential of application as down converting layers and can be implemented to improve the efficiency of photovoltaic cells, especially in the field of thin film PV structures. The proposed new deposition method can potentially be used in some industrial photovoltaic applications.

10

Study on the Photochromic Properties of Coloured Luminous Fibres Based on PA6

Yan Y., Zhu Y., Ge M.

Fibres & Textiles in Eastern Europe

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2016

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Vol. 24, no. 3 (117)

38--43

EN

Coloured PA6 luminous fibres were prepared by adding luminous material and inorganic pigments. The morphology and optical properties of the coloured PA6 luminous fibres were characterized. The results revealed that luminous materials were dispersed uniformly in the fibres without obvious agglomerates. The yellow inorganic pigment and luminous material might induce a reduction in the PA 6 fibre crystallization degree. The luminous fibres emitted long-lasting phosphorescence with an excitation peak at 360 nm and emission peak at 515 nm. However, the excitation spectrum of the PA6-Y exhibited three peaks. The decay curves revealed that the yellow inorganic pigment enhanced the brightness of PA6 luminous fibres. The PA 6 luminous fibres had low colour purities and a high colour rendering index. There was no obvious difference among the emissive colours of the luminous fibres, and the colours of luminous fibres were similar to those of the pigments added.

PL

Barwione luminescencyjne włókna PA6 przygotowano przez dodanie materiałów luminescencyjnych i pigmentów nieorganicznych. Scharakteryzowano właściwości morfologiczne i optyczne barwionych luminescencyjnych włókien PA6. Wyniki wykazały, że materiały luminescencyjne były rozproszone równomiernie we włóknach bez widocznych aglomeratów. Żółte pigmenty nieorganiczne i materiał luminescencyjny mogą powodować obniżenie stopnia krystalizacji włókien PA6. Włókna luminescencyjne emitowały długotrwałą fosforescencję z pikiem drgań przy 360 nm. Krzywe zaniku wykazały, że żółty pigment nieorganiczny zwiększa jasność luminescencyjnych włókien PA6. Luminescencyjne włókna PA6 charakteryzowały się niską czystością kolorów i wysokim współczynnikiem oddawania barw. Nie stwierdzono żadnej różnicy pomiędzy kolorami emisji luminescencyjnych włókien; barwy luminescencyjnych włókien były podobne do barwy dodanych pigmentów.

11

Automatic tracking of neural stem cells in sequential digital images

Zhang T., Jia W., Zhu Y., Yang J.

Biocybernetics and Biomedical Engineering

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2016

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Vol. 36, no. 1

66--75

EN

Neural stem cells are the cells that give rise to the main cell types of the nervous system. Due to their varying size and shape, and random movement, the tracking of these cells in suspension in video sequences is challenging. This paper develops an automatic tracking system for neural stem cells. The system first detects and localizes cells in the image sequence, followed by a feature extraction step for the subsequent cell tracking. Then, the system tracks inactive cells using an improved mean shift algorithm, divisive cells through a context-based technique, and active cells by means of dynamic local prediction (DLP) and gray prediction (GP) algorithms. Experimental results show that the proposed system not only improves the accuracy of fast moving tracking, but also constructs accurately the trajectories of the cell movement and reduces the iterations during the center searching.

12

Construction method of the topographical features model for underwater terrain navigation

Wang L., Yu L., Zhu Y.

Polish Maritime Research

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2015

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S 1

121--125

EN

Terrain database is the reference basic for autonomous underwater vehicle (AUV) to implement underwater terrain navigation (UTN) functions, and is the important part of building topographical features model for UTN. To investigate the feasibility and correlation of a variety of terrain parameters as terrain navigation information metrics, this paper described and analyzed the underwater terrain features and topography parameters calculation method. Proposing a comprehensive evaluation method for terrain navigation information, and constructing an underwater navigation information analysis model, which is associated with topographic features. Simulation results show that the underwater terrain features, are associated with UTN information directly or indirectly, also affect the terrain matching capture probability and the positioning accuracy directly.

13

Constitutive model for time-dependent ratchetting of SS304 stainless steel: simulation and its finite element analysis

Jiang X., Zhu Y., Hong J., Zhang Y., Kan Q.

Journal of Theoretical and Applied Mechanics

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2013

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Vol. 51 nr 1

63--73

EN

Time-dependent ratchetting behaviour of SS304 stainless steel was experimentally conducted at room temperature and 973K. The material shows distinct time-dependent deformation. However, under cyclic stressing with a certain peak/valley stress hold and at 973K, more significant time-dependent inelastic behaviour was observed. Based on the Abdel-Karim-Ohno nonlinear kinematic hardening rule with the static recovery term, a time-dependent hardening rule incorporating an internal variable in the dynamic recovery term of the back stress is proposed to reasonably describe the evolution behaviour of time-dependent ratchetting with a certain peak/valley stress hold and at high temperature. Simultaneously, the proposed model is implemented into the ANSYS finite element package by User Programmable Features (UPFs). It is shown that the customized ANSYS model exhibits better performance than the reference model, especially under cyclic stressing with the certain peak/Valley stress hold and at high temperature.

PL

W pracy przedstawiono wyniki badań eksperymentalnych nad zależnym od czasu procesem zmęczeniowym typu ratcheting przeprowadzonych w temperaturze pokojowej oraz podwyższonej do 973K. Materiał wykazał wyraźnie zależną od czasu funkcję deformacji. Podczas cyklicznego obciążania przy zadanych wartościach min/max naprężeń w temperaturze 973K zaobserwowano silnie nieliniowe i zależne od czasu zachowanie się badanej stali. Do wyjaśnienia tego zjawiska, zwanego ratchetingiem zależnym od czasu, wykorzystano model umocnienia materiału oparty na nieliniowej formule kinematycznego umocnienia Abdela-Karima-Ohno ze statycznym członem odprężania. Model ten zmodyfikowano, wprowadzając wewnętrzną zmienną w dynamicznym członie odprężania przy obciążeniu powrotnym. Jednocześnie zaproponowany model wdrożono do systemu ANSYS poprzez zastosowanie pakietu User Programmable Features (UPFs). Wykazano, że taka modyfikacja systemu ANSYS charakteryzuje się lepszym działaniem w stosunku do standardowego oprogramowania. Jest to szczególnie zauważalne dla symulacji cyklicznego obciążenia stali w podwyższonej temperaturze.

14

A distributed soil temperature measurement system with high spatial resolution based on BOTDR

Gao L., Shi B., Zhu Y., Wang K., Sun Y., Tang C.

Optica Applicata

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2011

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Vol. 41, nr 3

607--616

EN

This paper presents a new, recently developed, distributed soil temperature measurement sensor system, with high spatial resolution, based on Brillouin optical time domain reflectometry (BOTDR). The process of developing the distributed soil temperature sensor is introduced in detail, including the principle, materials, installation, instrumentation and calibration. The new distributed soil temperature sensor improves the spatial resolution from 100 cm to 3.3 cm, and has some other unique advantages, including long distance measurement capability, a longer life cycle, galvanic isolation, EMI immunity, good stability and ease of integration. Finally, an in situ comparison test was carried out, where results from the new sensor were compared to data measured using a standard point-mode system. This test proves that the newly developed distributed sensor is both accurate and has the capability to measure continuously the distribution of the soil temperature along the whole borehole depth, indicating that this new measure technique has a wide and powerful application potential.

15

Study on the Relationships Between Fibre Displacement and Strain by the Finite Element Method

Xu B., Zhu Y., Liu X.

Fibres & Textiles in Eastern Europe

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2011

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Vol. 19, no. 6 (89)

34--37

EN

The aim of this study was to establish a mathematical model of the relationship between fiber displacement and strain in the twisting process; the cross-section of yarn was taken at random. Based on the differential method, the plane stress was analysed mathematically, then stress and strain balance equations of the yarn cross-section were obtained. Then a geometry model of the cross-section was established using ANSYS10.0, which is a kind of Finite Element Analysis Software. Changes in the displacement can be simulated by this model, which reflects the relationship between the displacement and stress. The results showed that there are some relationships between the strain and displacement.

PL

Celem pracy było opracowanie modelu matematycznego dla zależności pomiędzy przemieszczeniem włókien a deformacją w procesie skręcania przędzy; przekroje przędzy wybierano w sposób wyrywkowy. W oparciu o metodę różnicową, naprężenia w określonej płaszczyźnie były analizowane matematycznie dzięki czemu uzyskano równania równowagi dla naprężeń i odkształceń. Następnie stworzono model geometryczny przekroju przędzy stosując program komputerowy ANSYS10.0 dotyczący obliczeń metodą elementów skończonych. Zmiany w przemieszczeniu włókien mogą być symulowane za pomocą zastosowanej metody pozwalając na uzyskanie zależności pomiędzy przemieszczeniem i naprężeniem. Wyniki wykazują istnienie zależności pomiędzy przemieszczeniem włókien a deformacją.

16

Integrated design for large-scale opto-mechanical structure

Li A., Bian Y., Liang Y., Zhu Y.

Optica Applicata

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2009

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Vol. 39, nr 2

383-389

EN

An integrated design method is discussed which thoroughly considers related parameters of the various subsystems in order to optimize the overall system that mainly consists of opto-mechanical structure CAD, CAE and the integrated information platform PDM. Based on the parameter drive of the virtual main model, the method focuses on the model transformation and data share among different design and analysis steps, and so the concurrent simulation and design optimization are carried out. As an example of application, the integrated design for a large-scale opto-mechanical structure is introduced, including optical design, structure design and analysis, which further validates the advantages of the method. Due to comprehensive consideration of the design and analysis process by CAD and CAE based on PDM, the integrated design well attains the structure optimization with high efficiency.

17

Potential Jurassic/Cretaceous boundary in northeastern China

Sha J., Chen S., Cai H., Jiang B., Yao X., Pan Y., Wang J., Zhu Y., He Ch.

Volumina Jurassica

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2006

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Vol. 4, no. 1

269-270

EN

On the basis of the geological ranges of the Buchia and dinoflagellate cyst assemblages and their global correlation, two distinct biostratigraphical boundaries (event horizons) can be distinguished in the continu ous deposits spanning the Jurassic/Cretaceous boundary in the Dong'anzhen Formation of Dong'an, Raohe County and the Dongrong Formation of boreholes SB86-11 and SB79-1 of Suibin, Suibin County of eastern Heilongjiang, northeasteren China (Fig. 1.). Level 1. The base of the Buchia fischeriana - Buchia unschensis assemblage is characterized by the occurrence of Buchia (e.g. B. unschensis) with inversoid ontogenetic growth of the right valve, and the absence of the underlying B. russiensis, one of the index species of the Buchia russiensis - Buchia fischeriana assemblage, with obliquoid ontogenetic growth of the right valve (Fig. 1, column 2b). The top of the dinoflagellate cyst Amphorula delicate assemblage underlies, but it is near this boundary (Fig. 1, column 2a). This level basically corresponds to the currently accepted Tethyan version of the Jurassic/Cretaceous boundary and the working base of the Cretaceous as recommended by the International Commission on Stratigraphy (www.stratigraphy.org) (Fig. 1, column 1), and approximately corresponds to the boundary between the Boreal Middle-Upper Volgian substages (Fig. 1, column 3). This is because the base of the Buchia unschensis Zone or the base of the Buchia fischeriana - Buchia unschensis assemblage nearly coincides with that of the Boreal Craspedites exoticus Subzone or Craspedites okensis ammonite Zone, which in turn correspond closely to the base of Tethyan Lower Berriasian Berriasella jacobi ammonite Zone (Fig. 1, column 1), which is the index ammonite zone of the Tethyan or the international chronostratigraphic base of Berriasian, and thus the base of the Cretaceous (Fig. 1, column 1). Level 2. The base of the Buchia volgensis - Buchia cf. subokensis - Buchia cf. okensis - Buchia unschensis assemblage, is characterized by those easy-to-recognize large-sized Buchia with inversoid ontogenetic growth of the right valve and even of the left valve, and absence of Buchia fischeriana (Fig. 1, column 2b). The base of the Oligosphaeridium pulcherrimum dinoflagellate cyst assemblage probably corresponds approximately to the base of this Buchia assemblage (Fig. 1, column 2a). This level is very near the Boreal version of the Jurassic/Cretaceous boundary, which corresponds approximately to the base of the Tethyan middle part of Middle Berriasian. This is because the bases of both Buchia volgensis and Buchia cf. okensis in the assemblage of Buchia volgensis - Buchia cf. subokensis - Buchia cf. okensis - Buchia unschensis are closely coincident with the base of the upper Lower Berriasian Boreal Hectoroceras kochi Zone (Fig. 1, columns 2b, 3), and the Tethyan upper Berriasella privasensis Subzone of the Tirnovella occitanica Zone of the middle part Middle Berriasian, approximately corresponds to the middle of the Boreal Lower Berriasian Substage (Fig. 1, columns 1, 3).