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Chinese Journal of Chemical Engineering 2020年第2期28卷 548-555页

作者： Xiaoli Xue Zhimin Zong guanghui liu XianyongWei Key Laboratory of Coal Processing and Efficient Utilization Ministry of EducationChina University of Mining&TechnologyXuzhou 221116China Key Laboratory of Changbai Mountain Animal and Plant Resource Utilization and Protection of Universities in Jilin Province Jilin Agricultural Science and Technology UniversityJilin 132101China State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering Ningxia UniversityYinchuan 750021China

Spent auricularia auricular substrate(SAAS)was oxidatively degraded with aqueous hydrogen peroxide(AHPO)/acetic anhydride(AAH)to produce carboxylic acids(CAs)under mild *** results show that up to 53.6%of the organic matter in SAAS was converted to the soluble species(SSs).In total 122 CAs were detected in the SSs by the analysis with a gas chromatograph/mass spectrometer,which can be classified into 29 group components,mainly being aliphatic acids and along with small amount of aromatic *** the aliphatic acids,normal alkanedioic acids are the most *** detected aromatic acids include benzoic acids,phthalic acids,trimellitic acids,pyromellitic acids,and their *** synergistic oxidation and the released·OH,CH3COO·,and HOO·induced by AHPO/AAH play crucial roles in oxidatively degrading SAAS.

关键词： Spent auricularia auricular substrate Mild oxidation Aliphatic acids Aromatic acids

Multiphysics simulation and optimization of the in-situ beneficiation process of ilmenite minerals from lunar regolith

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Science China Earth Sciences 2025年第1期 195-207页

作者： Peng ZHANG Xin liu guanghui liu Wei DAI Hanzhe YANG Haibo ZHENG Zhi WANG Ran NIU Yifan BAI Yang ZHANG Chengbao liu Ge YANG Junwei YANG Guang ZHANG Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing Hegong Simulation Co. Ltd

The exploration and utilization of lunar resources have become the major objectives of future lunar exploration missions. The classified collection and processing of lunar minerals is the basic prerequisite for the in-situ exploration and utilization of lunar resources. In this study, we propose a scheme for in-situ separation of magnetic minerals from lunar soils using the dry magnetic separation method. The scheme can realize the purpose of separating magnetic minerals from lunar regolith by altering the motion trajectory of lunar regolith particles with different magnetic properties. Detailed modeling of the dry magnetic separation device is conducted, and the three-dimensional distribution of magnetic parameters is calculated and analyzed. Based on the characterization and analysis of the Chang E-5's samples, the morphologies and physical parameters of lunar regolith particles are modeled and simulated. A discrete element simulation of the motion process of lunar regolith particles under multi-physical field conditions is performed, and the influences of key parameters on the beneficiation performance of lunar magnetic minerals are investigated. Our results indicate that optimal separation and beneficiation of lunar regolith particles can be achieved under specific conditions of magnetic field strength and drum speed. Additionally, we analyze the effects of lunar weak gravity conditions and the charged nature of lunar particles on the beneficiation process, showing that these factors can obviously enhance the beneficiation process of lunar ilmenites. This study demonstrates the feasibility of using the dry magnetic separation method for the beneficiation of magnetic minerals from lunar regolith, providing a theoretical basis for the scientific tasks of collecting, processing, and utilizing lunar mineral resources.

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The Dominant Glutamic Acid Metabolic Flux to Produce γ-Amino Butyric Acid over Proline in Nicotiana tabacum Leaves under Water Stress Relates to its Significant Role in Antioxidant Activity

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Journal of Integrative Plant Biology 2011年第8期53卷 608-618页

作者： Cuili liu Li Zhao guanghui Yu Key Laboratory for Biotechnology of the State Ethnic Affairs Commission College of Life Sciences South-Central University for Nationalities Wuhan 430074 China

γ-Amino butyric acid （GABA） and proline play a crucial role in protecting plants during various environmental stresses. Their synthesis is from the common precursor glutamic acid, which is catalyzed by glutamate decarboxylase and △1-pyrroline-5-carboxylate synthetase respectively. However, the dominant pathway under water stress has not yet been established. To explore this, excised tobacco leaves were used to simulate a water-stress condition. The results showed GABA content was much higher than that of proline in leaves under water-deficit and non-water-deficit conditions. Specifically, the amount of GABA significantly increased compared to proline under continuous water loss for 16 h, indicating that GABA biosynthesis is the dominant pathway from glutamic acid metabolism under these conditions. Quantitative reverse transcription polymerase chain reaction and protein Western gel-blot analysis further confirmed this. To explore the function of GABA accumulation, a system producing superoxide anion （O 2 - ）, peroxide hydrogen （H 2 O 2 ）, and singlet oxygen （ 1 O 2 ） was employed to investigate the scavenging role on free-radical production. The results demonstrated that the scavenging ability of GABA for O 2 - , H 2 O 2 , and 1 O 2 was significantly higher than that of proline. This indicated that GABA acts as an effective osmolyte to reduce the production of reactive oxygen species under water stress.

关键词： glutamic acid proline reactive oxygen species water stress γ-amino butyric acid.

Electric-field-induced microstructure modulation of carbon nanotubes for high-performance supercapacitors

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Frontiers of Materials Science 2019年第3期13卷 270-276页

作者： Chengzhi LUO guanghui liu Min ZHANG School of Electronic and Computer Engineering Peking UniversityShenzhen 518055China Shenzhen China Star Optoelectronics Technology Co. Ltd.Shenzhen 518132China

The growth direction,morphology and microstructure of carbon nano-tubes(CNTs)play key roles for their potential applications in electronic and energy storage ***,effective synthesis of CNTs in high crystallinity and desired microstructure still remains a tremendous *** we introduce an electric field for controlling the microstructure formation of *** reveals that the electric field not only make CNTs aligned parallel but also improve the density of ***,the microstructures of CNTs gradually change under electrical *** is,graphite sheets are transformed from the"herringbone"structure to a highly crystalline structure,facilitating the transportation of *** to the improved aligned growth direction,high density and highly crystalline microstructure,the electrochemical performance of CNTs is greatly *** the CNTs are applied in supercapacitors,they present a high specific capacitance of 237 F/g,three times higher than that of the CNTs prepared without electrical *** microstructure modulation of CNTs by electric field would help to construct high performance electronic and energy storage devices.

关键词： carbon nanotube electric field microstructure control supercapacitor electrochemical performance

Neighbor sum distinguishing total colorings of K4-minor free graphs

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Frontiers of Mathematics in China 2013年第6期8卷 1351-1366页

作者： Hualong LI Bingqiang liu guanghui WANG School of Mathematics Shandong University Jinan 250100 China

A total [k]-coloring of a graph G is a mapping φ： V（G） U E（G） →{1, 2, ..., k} such that any two adjacent elements in V（G）UE（G） receive different colors. Let f（v） denote the sum of the colors of a vertex v and the colors of all incident edges of v. A total [k]-neighbor sum distinguishing-coloring of G is a total [k]-coloring of G such that for each edge uv E E（G）, f（u） ≠ f（v）. By tt [G, Xsd（ J, we denote the smallest value k in such a coloring of G. Pilniak and Woniak conjectured X＇sd（G）〈 A（G）＋ 3 for any simple graph with maximum degree A（G）. This conjecture has been proved for complete graphs, cycles, bipartite graphs, and subcubic graphs. In this paper, we prove that it also holds for Ka-minor free graphs. Furthermore, we show that if G is a Ka-minor flee graph with A（G）〉 4, then ＂ Xnsd（G）〈 A（G）＋ 2. The bound A（G）＋ 2 is sharp.

关键词： K4-minor free graph neighbor sum distinguishing (nsd)

Enthalpy of phase transition of isonicotinic acid

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Chinese Journal of Chemical Engineering 2017年第7期25卷 971-975页

作者： Dongfang Zhao guanghui liu Jian Sun Lisheng Wang School of Chemical Engineering and Environment Beijing Institute of TechnologyBelting 100081China

In this work, the group contribution method of Chickos et al. was applied to estimate the fusion enthalpy of isonicotinic acid, and the obtained result(29.2 k J·mol^(-1)) showed a large difference with the value(135 k J·mol^(-1)) as reported from literatures and as determined by differential scanning calorimetry(DSC). The results of DSC/TG measurement showed that the phase transition of isonicotinic acid from 187.27 °C to277.47 °C underwent a sublimation process, with a sublimation enthalpy of 128.03 k J·mol^(-1). An efficient analytical technique combining pyrolysis and gas chromatography/mass spectrometry(Py-GC/MS) was used to prove this conclusion.

关键词： lsonicotinic acid Enthalpy of fusion Group contribution method Enthalpy of sublimation Py-GC/MS

High Step-up SEPIC Converters Based on a Family of Coat Circuit

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CSEE Journal of Power and Energy Systems 2023年第5期9卷 1753-1764页

作者： Binxin Zhu Yu Huang Yao Zhang guanghui liu Shihuan Chen the College of Electrical Engineering and New Energy China Three Gorges UniversityYichang 443002China

A family of coat circuits for SEPIC converters to improve their boost capability is *** present coat circuit does not contain any active switches,so the voltage conversion ratio of the presented converters can be enhanced without complicating its gate driver and control ***,because of the expansibility of the coat circuit,the number of its basic cells can be adjusted regarding the actual application ***,in comparison with a conventional SEPIC converter,voltage stress on power switch and diodes of the presented topology is lower at the same output voltage,and thus semiconductor components with low on-resistance are chosen to improve conversion efficiency of *** operational principle and steady state analysis of the SEPIC converter with one of the proposed coat circuits have been discussed in detail,and a 300W laboratory prototype is implemented to prove the theoretical analysis of presented converter.

关键词： Coat circuit high voltage gain low voltage stress SEPIC converter

Modular flexible“Tetris”microsatellite platform based on sandwich assembly mode

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Journal of Systems Engineering and Electronics 2023年第4期34卷 924-938页

作者： ZHOU Jun ZHANG Hao liu guanghui CHENG Cheng ZHANG Jiaolong School of Astronautics Northwestern Polytechnical UniversityXi’an 710072China National United Engineering Laboratory of Microsatellite Technology and Application Xi’an 710072China Shaanxi Engineering Laboratory for Microsatellites Northwestern Polytechnical UniversityXi’an 710072China

In this paper,a flexible modular“Tetris”microsatellite platform is studied to implement the rapid integration and assembly of *** proposed microsatellite platform is fulfilled based on a sandwich assembly mode which consists of the isomorphic module structure and the standard mechanical-electric-data-thermal *** advantages of the sandwich assembly mode include flexible reconfiguration and efficient *** prototype of the sandwich assembly mode is built for verifying the performance and the feasibility of the proposed mechanical-electric-data-thermal ***,an assembly case is accomplished to demonstrate the validity and advantages of the proposed“Tetris”microsatellite platform.

关键词： modular microsatellite design flexible platform sandwich assembly mode isomorphic module structure standard mechanical-electric-data-thermal interface

Li^+ extraction/insertion reaction with Mg_2Mn_(0.5)Ti_(0.5)O_4 inverse spinel in the aqueous phase

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Rare Metals 2007年第6期26卷 536-540页

作者： JANG Jinhe DONG Dianquan CHEN guanghui liu Jiaqiang LI Jianlong Department of Chemical Engineering Qingdao University of Science ＆ Technology Qingdao 266042 China

An inverse spinel-type metal oxide, magnesium-manganese-titanium oxide （Mg2Mn0.5Ti0.5O4）, were prepared using the coprecipitation/thermal crystallization method. The extraction/insertion reaction with this material was investigated by X-ray, saturation capacity of exchange, pH titration, and distribution coefficient （Kd） measurement. The acid treatments of Mg2Mn0.5Ti0.5O4 caused Mg^2＋ extractions of more than 81%, whereas the dissolutions of Mn^4＋ and Ti^4＋ were less than 10%. The experimental results proved that the acid-treated sample has a capacity of exchange 56 mg·g^-1 for Li^＋ in the solution. The chemical analysis showed that the Li^＋ extraction/insertion progressed mainly by ion-exchange mechanism and surface adsorption.

关键词： extraction/insertion reaction inverse spinel-type metal oxides ion-exchange mechanism Mg2Mn0.5Ti0.5O4

Isolation and purification of carbazole contained in anthracene slag by extraction combined with medium pressure liquid chromatography

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Chinese Journal of Chemical Engineering 2019年第12期27卷 2925-2929页

作者： Zhihao Ma XianyongWei Mingyao Zhou guanghui liu Fangjing liu Zhongqiu liu Xinyue Yu Zhimin Zong Key Laboratory of Coal Processing and Efficient Utilization Ministry of EducationChina University of Mining&TechnologyXuzhou 221116China State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering Ningxia UniversityYinchuan 750021China

Ultrasonic-assisted extraction(UAE)combined with medium pressure liquid chromatography(MPLC)was designed for carbazole separation from anthracene slag(AS).The effects of liquid/solid ratio,temperature,and extraction times on carbazole separation were *** using CC14 and ethyl acetate as extraction solvents and combining with MPLC,carbazole recovery and purity are 75.1%and 95.4%,*** mechanism for carbazole separation were presumed by examining intermolecular interactions such as N-H…π,π-π,and C-Cl…π*** results demonstrate that UAE/MPLC has a considerable potential as a green and promising strategy for separating and purifying carbazole and other chemicals from AS.

关键词： Anthracene slag Ultrasonic-assisted extraction Medium pressure liquid chromatography Intermolecular interactions