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June 30,2017
Volume 10,Issue 12
Pages -
Subject Area:Climatology,Coal Mining,Atmospheric Environmentology,Environmental Chemistry,High Performance Polymer Materials,Functional Polymer Materials,Energy Systems Engineering, Energy Economy,Biogas Energy

Title: Double focusing method of magnetic anomaly of dyke under the condition of undulate topography

Authors: CAI Jiaxiong, ZHAO Shuangqiu
PP: 1416-1424
Abstract: The traditional theory of inversion interpretation is based on the study of mathematical model, but the results are affected by the values of the normal field, the azimuth of the profile and the direction of magnetization. For the inversion of magnetic anomalies under the condition of undulate terrain, the results will bring more uncertainties. This paper presents the double focusing method based on the triangular interpretation theory, deduces the formula and graphics of magnetic fields of dyke, and researches prerequisite for accurate inversion under the condition of undulate topography. This paper also discusses methods and techniques of double focusing in the inversion, and illustrates application results of theoretical model and the actual project model. The exact value and optimum value will be solved by the method of double focusing for the theoretical anomaly and the actual anomaly respectively.
Keywords: earth-exploration and information techniques; undulate topography; magnetic anomaly of dyke; focusing to the origin; focusing to the step; similar interpretation

Title: Numerical simulation of the wave-induced mixing in the coupled model

Authors: ZHANG Wenqing, GUAN Changlong
PP: 1407-1415
Abstract: In this paper, the parameterized schemes of the mixing due to turbulence generated by wave-induced motion is added to the coupled ocean-atmosphere-wave-sediment transport modeling system (COAWST). The wave breaking and wave induced motion on the mixing under the condition of hurricane are investigated by idealized cases. Then the response of ocean to hurricane and the performance of COAWST which contains these two different wave-induced mixing mechanisms are discussed. In these idealized cases, the sea surface temperature will be decreased, and the mixed layer depth, turbulence kinetic energy (TKE), viscosity coefficient (VC) and dissipation of TKE will be increased if the effects of the wave breaking and wave-induced motion on the mixing are considered. Wave-induced motion can effectively transfer the turbulent kinetic energy to the deeper ocean and enhance the mixture of the upper ocean. Furthermore, the parameterized schemes of mixing due to turbulence generated by wave breaking and wave-induced motion which are embedded in the k-ω turbulent mixing scheme are feasible.
Keywords: physical oceanography; wave-induced mixing; wave breaking; wave-induced motion; COAWST

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Title: Design and optimization of trapping shoe for shearer based on reverse technology

Authors: ZHENG Xiaochun, DENG Juan, YANG Lizhao
PP: 1387-1392
Abstract: Relying on entity as research object, reverse technology which is used for mapping, modeling, simulation, optimization and new product development is one of the important means of modern design. In this paper, we use the reverse technology to optimize the design of a trapping shoe and 3D scanning technology to obtain point cloud data and spatial geometry of a trapping shoe. The cloud data are processed by the reverse software Imageware and the 3-dimensional parameterized model is established to provide a guarantee for the upgrading of the product.
Keywords: mining mechanical engineering; reverse technology; shearer; trapping shoe; design and optimization

Title: Design and optimization of slewing platform for 4 000 Nm full hydraulic tunnel drilling rig based on ANSYS Workbench

Authors: YANG Shuai, HAN Chao
PP: 1381-1386
Abstract: The finite element simulation software ANSYS Workbench is used to carry out the simulation analysis of the slewing platform. It is verified that the platform meets the design requirements and still has some optimization space. The optimization module of ANSYS Workbench is used to optimize the design of the slewing platform. The thickness of the platform is chosen as the design variable and the platform weight is set as the objective function. Finally, three sets of optimal solutions are obtained, and a set of solutions is chosen, in which the optimization of the maximum stress and the minimum platform quality is achieved in balance. So that it can reach the purposes of saving the plate and reducing the weight.
Keywords: coal mining; slewing platform; ANSYS Workbench; simulation; design and optimization

Title: Co-pyrolysis of corncob and coal gangue with γ-Al2O3-based catalyst

Authors: LIU Xiaohong, WANG Baofeng, ZHANG Jinjun
PP: 1369-1380
Abstract: Co-pyrolysis behaviors of corncob and coal gangue are studied in a fixed bed reactor. The effects of blending ration, temperature and additives on products are investigated. Results show that the liquid oil yields observed are higher than calculated values at coal gangue proportion of 20% and 40%, and corncob and coal gangue had synergistic effect during co-pyrolysis above 200℃. γ-Al2O3 and modified γ-Al2O3 have effect on product distributions and property. Adding γ-Al2O3and modified γ-Al2O3 (except Co/γ-Al2O3), the yields of liquid oil have no abvious change. But all additives enhance the yeilds of solid, and decrease the yeilds of gas. While, Co/γ-l2O3decrease the yeilds of liquid oil. 1H nuclear magnetic resonance (1H NMR), 13C nuclear magnetic resonance(13C NMR) and Fourier transform infrared spectroscopy (FTIR) analysis indicated thatduring the co-pyrolysis, the contents of aliphatic compounds were increased and the contents of oxygenated compounds, aromatic ether and carbohydrates were decreased, which showed that liquid oil obtained from co-pyrolysis has a good property. Co/γ-Al2O3, PW12/γ-Al2O3, Mo/γ-Al2O3and γ-Al2O3 also have important influences on the liquid oil property, and adding them could reduce the contents of undesirable components (carboxylic acids, ketones and aldehydes) and enhanc the contents of alkene and phenols compounds.
Keywords: processing and comprehensive utilization of three wastes; corncob; coal gangue; co-pyrolysis; additives

Title: In-situobservation study of methane and nitrous oxide emissions from paddy fields

Authors: JI Cheng, JIN Yaguo, KONG Delei, LIU Shuwei
PP: 1360-1368
Abstract: This study was carried out in the conventional paddy fields (rice-winter wheat rotations), CH4 and N2O fluxes were simultaneously measured by using static opaque chamber-gas chromatograph method. The main objectives of this study were to gain an insight into CH4and N2O emission intensity, emission characteristics, driving mechanism, and their net global warming potential (GWP) in the paddy fields. Results showed that different levels of nitrogen fertilizer cannot alter annual emission patterns of CH4and N2O in the paddy fields. Substantial CH4 emissions from the paddy fields were mainly during the rice growing season, while N2O emissions were mostly during the following non-rice season (including following fallow period and wheat season). Increasing the amounts of nitrogen fertilizer can reduce the annual CH4emission, but remarkably increase the annual N2O emission and their net GWP did not differ significantly over a 100-year horizon.
Keywords: atmospheric environmentology; paddy fields; CH4; N2O; global warming potential

Title: Distribution characteristics and potential risk of heavy metals in the sediment of Laizhou bay

Authors: XIAO Cailing, LI Dan, LI Yanbin
PP: 1352-1359
Abstract: Two cruises were conducted to investigate the distribution, controlling factors and potential risk of heavy metals in the surface sediments of Laizhou bay in July and October of 2016. The concentrations of seven heavy metals (As, Cd, Cr, Cu, Ni, Pb and Zn) in the sediments were measured. The potential ecological risks of heavy metals were then evaluated by both the potential ecological risk index (PERI) and sediment quality guidelines (SQGs) methods. The results indicate that the “hot spots” of heavy metals mainly distribute near the Yellow river estuary and Xiaoqing river mouths. Risk assessment indicates that Cd, As, Cu and Cr should be listed as the priority contaminant metals in Laizhou bay.
Keywords: environmental chemistry; heavy metals; sediment; risk assessment; Laizhou bay

Title: Degradation of dye wastewater in a combined electrochemical Fenton-like system

Authors: WANG Jia, HUANG Yawei, ZHOU Tao, WU Xiaohui, MAO Juan
PP: 1345-1351
Abstract: To improve the utilizing efficiency of Fe2+ and H2O2 in traditional Fenton system, a novel combined electrochemical Fenton-like system (Electro-Fe2+/EDTA) was proposed in this study, where activation of O2via Fe2+-EDTA complex to hydroxyl radical and electrochemical regeneration of Fe2+ species would occur simultaneously. It demonstrated that the system could efficiently degrade an azo dye pollutant Rhodamine B (RhB) and 85% degradation efficiency was obtained after 3 h treatment. Furthermore, response surface methodology was used to optimize the important operation parameters in this system and Box-Behnken design (BBD) was adopted. Initial RhB concentration, pH, electrode voltage and Fe2+ with EDTA dosing ratio (Fe2+:EDTA) were investigated. It was found that the obtained model could successfully predict the degradation efficiency of RhB at optimized conditions, while initial RhB concentration, pH, electrode voltage and Fe2+:EDTA would significantly affectthe degradation efficiency.
Keywords: environmental chemistry; electrochemical Fenton-like oxidation; response surface methodology; iron-EDTA ligand; Rhodamine B

Title: Synthesis and conductivity performance study of PEG-based comb-like polymer electrolyte for lithium ion battery

Authors: ZENG Huihui, LIN Die, JI Xiaoxiao, SHI Dean, LI Robert Kuo Yiu
PP: 1338-1344
Abstract: A self-cross-linked comb-like copolymer with polyolefin containing unsaturated C==C double bonds in main chains and PEG in side chains was prepared via ring opening metathesis polymerization (ROMP) method. The ionic conductivity and tensile property of polymer electrolyte (synthetic polymer with lithium perchlorate) were studied. The result showed that the highest ionic conductivity of 1.029×10−4 S/cm was obtained at room temperature, when the lithium salt content was 20% (mass fraction) and the molecular weight of PEG was 550 g/mol; and the tensile strength of polymer electrolyte membrane was over 2 MPa, which provided a potential application to lithium ion battery. Further study found that, the ionic conductivity increased with the increasing of content of PEG side chains in comb-like polymer; the conduction of lithium ion among ether oxygen segment, was not only related to the length of the PEG side chain, but also related to the distance between side chains.
Keywords: high performance polymer materials; comb-like copolymer; PEG; polymer electrolyte; ionic

Title: Synthesis of comb-shaped sulfonated poly(ether ether ketone) by atom transfer radical polymerization method

Authors: XIE Hongmei, WU Shuhong, DAI Suyi, SHEN Guiyan, HUANG Xuehong
PP: 1328-1337
Abstract: Poly(ether ether ketone) (PEEK) was synthesized by aromatic nucleophilic polycondensation reaction of 4,4’-difluorobenzophenone, bisphenol A and 2-methylhydroquinone. Double-arm PEEK macroinitiator containing isopropyl bromide end groups was obtained by bromination. Comb-like PEEK-g-PStSO3Na was successfully synthesized via atom transfer radical polymerization (ATRP) using double-arm PEEK as macroinitiator and sulfonated styrene as monomer. The structure and morphology of PEEK-g-StSO3Na membrane were characterized by Fourier transform infrared spectroscopy (FTIR), 1H nuclear magnetic resonance (1H NMR), thermogravimetry (TG) and scanning electron microscope (SEM). The synthesized PEEK-g-StSO3Na is found to improve hydrophilic/hydrophobic phase separation. The ion exchange capacity (IEC), water content and onductivity of PEEK-g-StSO3Na were 1.41 mmol/g, 51.9% and 5.42×10−2 S/cm, respectively. However, its swelling ratio is 8.16% which is lower than that of Nafion117 membrane (11.50%). Otherwise, comb-shaped PEEK-g-StSO3Na has a better H+ permeability than main-chain sulfonated PEEK (SPEEK) membrane with the same IEC value.
Keywords: functional polymer materials; atom transfer radical polymerization; sulfonated poly(ether ether ketone); sodium styrenesulfonate; ion exchange capacity

Title: Recent process in BaTiO3-based positive temperature coefficient ceramic material

Authors: ZHANG Maolin, XUE Tongtong, WANG Ruize, HU Jinzhi, AN Chengze
PP: 1319-1327
Abstract: BaTiO3-based ceramic positive temperature coefficient (PTC) thermistor is an important functional device, mainly focusing on its electrical performances of room temperature resistance, resistance jump ratio and Curie temperature. In this paper, the study history, current situation and the latest process on BaTiO3ceramics are discussed. It is found that donor doping changing the energy level structure is the main way to realize the semiconducting and reduces the room temperature resistance. The formation of controllable grain boundary barrier by using the grain boundary acceptor state is an important method to control the PTC effect. Meanwhile, addition of the ferroelectric phase into the semiconducting BaTiO3-based ceramics is considered as an effective way to increase the Curie temperature. In addition, the new development trends of PTC materials with new physical mechanisms and applications are also discussed.
Keywords: other subjects of inorganic nonmetallic materials; BaTiO3; review; thermistor; grain boundary; Curie temperature

Title: Hardware-in-loop simulation of solid oxide fuel cell/micro gas turbine hybrid power generation system

Authors: YANG Chen, JIANG Shuai, PAN Hengyao
PP: 1310-1318
Abstract: Because the exhaust gas discharged from the solid oxide fuel cell (SOFC) has a high latent heat, the power generation efficiency of the system will be higher than that of the SOFC or micro gas turbine (MGT) when it is mixed with a MGT. It has a great potential for distributed power generation program. In this paper, the dynamic mathematical modeling of two subsystems of SOFC and MGT is established based on the SOFC-MGT hybrid power generation system. The electrochemical and thermodynamic properties of the SOFC model are analyzed, and the performances of the two subsystems and the coupled system are simulated and analyzed. The results show that the SOFC-MGT system in this paper has good steady-state performance and dynamic performance in non-coupled state and coupled state of the two subsystems. The research of this paper provides a theoretical basis for the construction of the hardware-in-the-loop simulation system, as well as a important reference for the design and operation of the SOFC-MGT hybrid power generation system.
Keywords: energy systems engineering; hardware-in-loop simulation; solid oxide fuel cell; micro gas

Title: Thermal characteristics experiment and simulation of lithium-ion battery

Authors: HOU Wenna, TONG Meng, ZHANG Yingli, GUO Ligang, CHEN Huan
PP: 1297-1309
Abstract: In this paper, both the internal resistance characteristic experiment and the temperature rise characteristic experiment were done based on Li-Co lithium-ion battery cell. The relationship between internal resistance and state of charge (SOC) of the battery cell was obtained through the internal resistance experiment. This is in preparation for the subsequent establishment of battery thermal effect model. The accuracy of the thermal effect model was verified by the data of the temperature rise characteristic experiment. The Fluent software was used to simulate the heat generation of Li-Co lithium-ion battery cell. By comparing the lowest temperature obtained by the numerical simulation of lithium-ion battery and the experimental data, we concluded that the simulated temperature trend and the measured temperature trend of the battery are basically the same under the same conditions. And the temperature deviation of the battery surface is not great when a small current discharge. It is shown that the numerical simulation using the battery thermal model in this paper can better reflect the temperature rise situation of lithium-ion battery during the lower discharge current, which is of great reference value for the establishment of the thermal model and the design of the cooling structure of the electric vehicle battery.
Keywords: secondary energy; lithium-ion battery; thermal characteristics experiment; temperature

Title: Research advance of anaerobic digestion additive

Authors: XU Qiuzi, ZHANG Duojiao, DUAN Na, LIN Cong, WANG Zhiqiang
PP: 1287-1296
Abstract: Anaerobic digestion is an effective way to realize resource recycling and innoxious treatment of wastes. In this paper, the function and mechanism of five kinds of anaerobic digestion additives, including nutrient, hydrolase and hydrolytic microorganism, mineral material, intermediate and waste residue was stated, and the current research status at home and abroad was analyzed. The results show that the additive can enhance hydrolysis rate and biodegradation rate, shorten start-up period, as well as improve biogas production. It has good application prospects. The existing studies are still on a laboratory scale and the further study may focus on engineering application or compounded regulators.
Keywords: biogas energy; anaerobic digestion; review; additive; methane

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