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1

Katalityczne zgazowanie stężonych ścieków zaolejonych w warunkach nadkrytycznych

Gao Ming, Xu Junjie, Chu Zhuzhuan, Li Hui, Su Hao

Przemysł Chemiczny

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2023

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T. 102, nr 10

1008--1012

PL

Do oczyszczania ścieków zawierających olej (zawartość 4000 mg/L) zastosowano katalityczne zgazowanie w warunkach nadkrytycznych. Katalizator nano-CuO został przygotowany i użyty (2 mg/L) w obecności H₂O₂ (do 300 mg/L). Katalizator wykazał wysoką aktywność w degradacji olejów zawartych w ściekach. Przy pH 11 i w temp 445°C wartość ChZT ścieków zmniejszyła się o 95,6% po 25 min oczyszczania.

EN

The catalytic supercrit. gasification was used to purify the oil-containing wastewater (oil content 4000 mg/L). The nano-CuO catalyst was prepd. and used (2 mg/L) in presence of H₂O₂ (up to 300 mg/L). The catalyst showed high activity in degrdn. of the wastewater-contained oils. At pH 11 and temp. 445°C, the COD of the wastewater decreased by 95.6% after 25 min long treatment.

2

Study of a Compton backscattering wall defects detection device using the Monte Carlo method

Qin Xuan, Yang Jianbo, Du Zhengcong, Xu Jie, Li Rui, Li Hui, Liu Qi

Nukleonika

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2023

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Vol. 68, No. 2

57--63

EN

In view of the shortcomings of traditional wall defect detection methods, such as small detection range, poor accuracy, non-portable device, and so on, a wall defects detection device based on Compton backscattering technology is designed by Monte Carlo method, which is mainly used to detect the size and location information of defects in concrete walls. It mainly consists of two parts, the source container and the detection system: first, through the simulation and analysis of the parameters such as the receiving angle of thebackscattered particles and the rear collimating material of the detector, the influence of the fluorescent X-ray peak of the detector collimating material on the backscattered particle counts is eliminated and the detected error is reduced; second, the ring array detector design, compared with single array detector and surface array detector, can facilitate real-time detection of defect orientation, expanding the single scan range and improving the detection efficiency. After simulation and comparative analysis, the relevant optimal parameters are obtained: the object is detected using a Cs-137 γ-ray source with an activity of 6 mCi, and a ring detector consisting of four 0.5-inch cube-shaped CsI scintillator detectors is placed at 150° to receive the backscattered photons. The simulation analysis using the Monte Carlo FLUKA program showed that the maximum depth of wall defect detection is 8 cm, the maximum error fl uctuation range of defect depth and thickness is ±1 cm, the overall device weight is <20 kg, and the measurement time is <5 min.

3

A heuristic algorithm for equipment scheduling at an automated container terminal with multi-size containers

Li Hui

Archives of Transport

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2023

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Vol. 65, iss. 1

67--86

EN

With the increasing volume of shipping containers, container multimodal transport and port scheduling have attracted much attention. The allocation and dispatching of handling equipment to minimize completion time and energy consumption have always been a focus of research. This paper considers a scheduling problem at an automated land-maritime multimodal container terminal with multi-size containers, in which operating facilities and equipment such as quay cranes, vehicles, yard cranes, and external container trucks are involved. Moreover, the diversity of container sizes and the location of handshake areas in yards are concerned. A mixed integer programming model is established to schedule all operating facilities and equipment. To solve the mathematical model is a NP-hard problem, which is difficult to be solved by conventional methods. Then we propose a heuristic algorithm which merges multiple targets into one and designs an improved genetic algorithm based on the heuristic combination strategy in which 20-ft containers are paired-up to the same yard before allocation. After that, some experiments are designed to prove the effectiveness of the model and the algorithm. The effect of configurations on efficiency and energy consumption under different conditions is discussed, and the influences of different parameters and the proportion of 20-ft containers are also compared. Furthermore, the influence of locations of handshake area with different yard quantities are compared. To conclude, there is an optimal number of equipment to be allocated. If few equipment is used, the operation time will be prolonged; if too many, the energy consumption will be increased. When the yard operation is the bottleneck, the handover location should be in the centre, otherwise other locations might be feasible. When the proportion of 20-ft containers that can be combined is large, the method proposed in this paper has advantages over traditional methods. The proposed algorithm has made a breakthrough in improving efficiency and reducing energy consumption.

4

Study on Microstructure and Mechanical Properties of Friction Stir Welding Joints of In-Situ Al3Zr/AA6082 Particle-Reinforced Aluminum Matrix Composites

Li Hui, Sun Caizhi, Wang Feng, Qiao Yuanpeng, Li Chuying, Xu Pinyi, Zatulovskiy Andrii, Shcheretskyi Volodymyr

Archives of Metallurgy and Materials

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2023

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Vol. 68, iss. 3

907--919

EN

In this paper, the Al-K2ZrF6 reaction system was used to prepare in-situ Al3Zr/AA6082 particle-reinforced aluminum matrix composites by electromagnetic stirring melt reaction method, and the friction stir welding technology was used to weld the plate. The microstructure and mechanical properties of the welded joints were studied when the rotating speed was 14000 rpm and the welding speed was 30, 50 and 70 mm/min respectively. The results show that the weld forming quality and tensile properties of the FSW joints with welding parameters of 14000 rpm and 50 mm/min are the best, the tensile strength is 142(±0.5) MPa and the elongation is 8.2%. SEM analysis shows that the particle size of the reinforcing phase in the base metal is refined to about 5-10 μm, while that in the NZ is about 1-5 μm. The grain size in the HAZ is about 20-30 μm and in the NZ is about 5-10 μm. EBSD analysis shows that the proportion of low-angle grain boundary in the NZ is 59.7% and of recrystallized grain structure is 23.65%, while the proportion of small-angle grain boundary in the HAZ is 24.35% and of recrystallized grain structure is 37.18%. It provides theoretical and experimental basis for the forming and application of friction stir welding of the composite.

5

Effects of the distribution of solid particles on the rheological properties and buildability of 3DPM fresh pastes with different FA/GGBFS content

Xu Zhuoyue, Zhang Dawang, Li Hui, Sun Xuemei

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 2

art. no. e82, 2023

EN

3D printing technology has attracted great attention from the construction industry for its superior performance compared with traditional construction technology. In this study, the rheological properties of fresh mixed pastes with different contents of fly ash (FA) and granular ground blast furnace slag (GGBFS) were evaluated by analyzing rheology indices and the fitting of the Bingham model, and the relationship between the rheological properties, the buildability of 3D Printing Material (3DPM) and n value of the Rosin-Rammler distribution function was established. The results show that with increasing FA or GGBFS content, the rheological properties (fluidity, yield stress, and plastic viscosity) of fresh mixed pastes first improved and then deteriorated, and the n value (constant for the width of the particle distribution) first decreased and then increased. When the FA content was 20%, the paste fluidity reached a maximum value of 178 mm, the n value (1.01782) was the smallest, the particle size distribution was the widest, the accumulation was the best, and the buildability of 3DPM was the best. In addition, it can be seen from the SEM analysis that FA and GGBFS participate in the cement hydration to a limited extent, which mainly play the role of compaction and adjustment of particle size distribution. This is consistent with the test results of XRD. In short, by adjusting the amount of FA and GGBFS, the particle size distribution of the whole cementitious material system changes. When the fluidity of 3DPM was between 160 and 180 mm, the smaller the n value of the Rosin-Rammler distribution function, the better its buildability was.

6

A triboelectric nanogenerator based on a pendulum-plate wave energy converter

Zhu Shenglin, Yang Shaohui, Li Hui, Huang Yan, Du Zhichang, Fan Jianyu, Lin Zhonghua

Polish Maritime Research

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2022

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nr 4

155--161

7

Effect of the oxygen-containing functional group on the adsorption of hydrocarbon oily collectors on coal surfaces

Wan He, Hu Xianglin, Luukkanen Saija, Qu Juanping, Zhang Chonghui, Xue Jiwei, Li Hui, Yang Wei, Yang Shenghong, Bu Xianzhong

Physicochemical Problems of Mineral Processing

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2022

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Vol. 58, iss. 4

art. no. 149937

EN

The oxygen-containing functional groups (OCFG) on the coal surface affect the adsorption effect of hydrocarbon oily collectors (HOC). An investigation of the interaction between the HOC and OCFG in the absence and presence of water is conducive to understanding the effect of OCFG type on the adsorption of HOC on the coal surface. In this paper, FTIR analysis was used to analyze the OCFG type of coal surface. The adsorption behavior of HOC on different OCFG surfaces was investigated using molecular dynamics simulation. The results indicated the presence of OCFG such as -OH, -COOH, -C=O, and -COCH3 on the coal surface. In conditions without water, the effect of OCFG on HOC adsorption capability follows the order -COOH > -C=O > -OH > -COCH3. In an aqueous solution, the effect of OCFG on HOC adsorption capability follows the order -C=O>-COCH3>-OH>-COOH. Moreover, the hydrophilicity of OCFG is the key factor that affects the adsorption effect of HOC. In other words, the adsorption effect of HOC on the coal surface in an aqueous solution does not depend on the strength of the interaction between the OCFG and HOC in the absence of water, but on the hydrophilicity of the OCFG. The -COOH and -OH on the coal surface are not conducive to the adsorption of HOC onto the coal surface. Masking the -COOH and -OH of the coal surface is beneficial in improving the coal flotation performance with HOC as a collector.

8

A study of health management of LWD tool based on data-driven and model-driven

Li Hui, He Zi Hua, Zhang Yu ting, Feng Jin, Jian Zun Yi, Jiang Yi Bo

Acta Geophysica

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2022

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Vol. 70, no 2

669--676

EN

Electromagnetic wave logging-while-drilling (LWD) tool plays an important role in unconventional oil and gas exploitation and deep-sea oil and gas resource exploration process. The reliability such as reliable life and durability of the tool can control drilling efficiency and production cost in extreme environmental conditions. In this paper, main faults of the electromagnetic wave LWD tool have been analyzed when it working to the drilling site. Failure time of antenna coils, circuit boards, and power supply have been recorded. Therefore, failure mode and failure mechanism can be analyzed of the tool. Secondly, a fault analysis model of electromagnetic wave LWD tool based on Weibull distribution model has been built up, and by using this fault analysis model the reliable life and the remaining useful life of antenna system can be calculated. The last, the goodness-of-ft test can be operated to Weibull distribution model by using Kolmogorov–Smirnov test. Study results show that the reliability and the law of fault occurrence of electromagnetic wave LWD tool can be directly reflected. And it has practical significance to reliability evaluation of the instrument system and joint optimization of safe operation and maintenance of the tool.

9

Research on dose correction method of vehicle-borne environmental radiation measurement equipment

Xu Jie, Ren Jizhou, Yang Jianbo, Fan Jiawen, Li Rui, Li Hui, Huang Weiqi, Yuan Biao

Nukleonika

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2021

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Vol. 66, No. 3

103--110

EN

This study establishes a near-ground reference radiation field based on typical radionuclides of the Fukushima accident in response to the need for vehicle-borne environmental radiation measurement equipment that can accurately evaluate the environmental dose of nuclear accidents. The Monte Carlo code FLUKA is used to study the environmental dose of such equipment in the early and mid-late reference radiation fields of nuclear accidents. Results of the air dose rate at 1 m above the ground were corrected to eliminate data difference between diverse measurement platforms. Simulation results show that t he dose correction factor (CF) fluctuates at approximately 0.8813 in the early reference radiation field and at approximately 0.6711 in the mid-late reference radiation field . This deviation of the dose CF in the early and mid-late reference radiation field s is within 2% and is not affected by the change in detector position. This research can be applied to obtain more accurate measurement of an ambient dose in the near-ground radiation field and support the vehicle-borne environmental radiation measurement technology.

10

Experimental Insight into the Catalytic Mechanism of MFe2O4 (M = Ni, Zn and Co) on the Thermal Decomposition of TKX-50

Hou Xiaoting, Zhang Ming, Zhao Fengqi, Yang Yanjing, An Ting, Li Hui, Pan Qing, Wang Xiaohong, Zhang Kun

Central European Journal of Energetic Materials

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2021

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Vol. 18, no. 2

223--244

EN

Synthesized dihydroxylammonium 5,5’-bistetrazole-1,1’-diolate (TKX-50) owes its outstanding application prospects in the field of insensitive solid propellants not only to its high energetic performance but also to its low mechanical sensitivity. Based on the excellent catalytic activity of bimetallic iron oxides for the thermal decomposition of TKX-50, the catalytic mechanism of bimetallic iron oxides (NiFe2O4, ZnFe2O4 and CoFe2O4) for TKX-50 pyrolysis has been explored. For this study, the decomposition process of TKX-50, before and after mixing with the bimetallic iron oxides NiFe2O4, ZnFe2O4 and CoFe2O4 was monitored by in-situ FTIR and gas-phase MS-FTIR instruments. Of the different catalysts, ZnFe2O4 gave the best result for reducing the initial decomposition temperature of TKX-50. Additionally, the activation energy of functional group cleavage of TKX-50, before and after mixing with ZnFe2O4, was also calculated for mechanism analysis from the results of the in-situ FTIR measurements. The results showed that the condensate and the gas-phase decomposition products of TKX-50 remained unchanged after mixing with different catalysts, while the activation energy of tetrazole ring cleavage was significantly reduced. The results of this study will be helpful for the rational design of insensitive solid propellant formulations containing TKX-50, and for understanding the pyrolysis mechanisms of TKX-50 before and after mixing with the efficient catalyst ZnFe2O4.

11

Preliminary study on wave feld and dispersion characteristics of channel waves in VTI coal seam media

Ji Guangzhong, Li Hui, Wei Jiuchuan, Yang Sitong

Acta Geophysica

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2019

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Vol. 67, no. 5

1379--1390

EN

Coal seam is a sedimentary rock with bedding, which can be regarded as VTI medium. VTI medium model is more suitable for real coal seam. However, existing channel wave theories generally assume that coal seams are isotropic for mathematical simplicity, and there is no study on the properties of channel waves in VTI media. In this paper, we deduce the theoretical dispersion equation of Love channel waves in the three-layer VTI model and analyze the parameter efects on the dispersion curve for the frst time. The channel wave feld in VTI media is simulated by three-dimensional staggered-grid finite diference method. The results indicate that polarization of both qP- and qSV-waves is not parallel or perpendicular to the orientation of the wave traveling in VTI media, while the polarization of SH wave is normal to wave propagation direction at horizontal plane. Therefore, it is wise to use Love channel waves to conduct feld exploration because of the uniqueness of dispersion curves in the VTI media for the Love channel waves comparing with that in isotropic media. The velocities of the Love channel wave in VTI media are higher than that in isotropic media. The coal seam thickness primarily infuences the Airy frequency phase, while the Airy phase velocity remains stable. Both the S-wave velocity and γ parameter of coal seam significantly afect Airy phase velocity. Severe errors may occur during in the coal thickness inversion when using the dispersion curve of Love channel wave in isotropic media, and dispersion curve in VTI media should be adopted. In terms of the amplitude distribution, Love channel waves appear to have similar patterns in both the VTI media and the isotropic media.