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Solvent extraction of thorium(Ⅳ) using W/O microemulsion

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Science China Chemistry 2012年第9期55卷 1712-1718页

作者： gao song SHEN XingHai CHEN QingDe gao HongCheng Beijing National Laboratory for Molecular Sciences(BNLMS) Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental ScienceCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The extraction of thorium(IV) was investigated using two types of W/O microemulsion,one of which was formed by a surface-active saponified extractant sodium bis(2-ethylhexyl) phosphate(NaDEHP) and the other was formed by a mixture of an anionic surfactant sodium bis(2-ethylhexyl) sulfosuccinate(AOT) and an extractant bis(2-ethylhexyl)phosphoric acid(HDEHP) as the *** extraction capacities of the above two systems were higher than that of the HDEHP extraction *** concentration of NaNO 3 showed no influence on the extraction in the NaDEHP based W/O microemulsion system,whilst reduced the extractability in the AOT-HDEHP W/O microemulsion *** mechanism in acidic condition was demonstrated by the log-log plot *** structure of the aggregations and the water content in the organic phase after extraction were measured by dynamic light scattering and Karl Fischer water titration,*** was found that NaDEHP based W/O microemulsion broke up after extraction,while AOT-HDEHP W/O microemulsion was reserved.

关键词： W/O microemulsion thorium ions extraction

Cutting force prediction for circular end milling process

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Chinese Journal of Aeronautics 2013年第4期26卷 1057-1063页

作者： Wu Baohai Yan xue Luo Ming gao Ge Key Laboratory of Contemporary Design and Integrated Manufacturing Technology Ministry of Education Northwestern Polytechnical University AVIC Commercial Aircraft Engine Co. Ltd.

A deduced cutting force prediction model for circular end milling process is presented in this paper. Traditional researches on cutting force model usually focus on linear milling process which does not meet other cutting conditions, especially for circular milling process. This paper presents an improved cutting force model for circular end milling process based on the typical linear milling force model. The curvature effects of tool path on chip thickness as well as entry and exit angles are analyzed, and the cutting force model of linear milling process is then corrected to fit circular end milling processes. Instantaneous cutting forces during circular end milling process are predicted according to the proposed model. The deduced cutting force model can be used for both linear and circular end milling processes. Finally, circular end milling experiments with constant and variable radial depth were carried out to verify the availability of the proposed method. Experiment results show that measured results and simulated results corresponds well with each other.

关键词： Chip thickness Circular end milling Cutting force Machining Radial depth Tool path curvature

Aluminum formate(AF): Synthesis, characterization and application in dye wastewater treatment

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Journal of Environmental Sciences 2018年第12期30卷 95-106页

作者： Moxi xue Baoyu gao Ruihua Li Jianzhang Sun Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University

Aluminum formate（AF）, a degradable and non-corrosive coagulant, was synthesized from aluminum hydroxide and formic acid. Polyamidine（PA）, as a coagulation aid, was combined with AF for dye wastewater treatment. AF was characterized by XPS, FT-IR, viscosity, zeta potential, mass spectrum and XRD, and the flocculation properties of the dual-coagulation system were characterized by FT-IR and SEM. The results showed that COOH, Al2 O3-Al and O2-Al bonds were formed in the AF synthesis process, and AF had a higher molecular weight and higher charge neutralization ability than PAC. The hydrolysates of AF were determined to contain Al（13）Al（11） and Al2, and the components of AF were confirmed to comprise a mixture including aluminum formate（C3H3AlO6） and its hydrate. When the color removal efficiency reached 100% in jar tests, the optimized dosage of AF/PA was 18.91/0.71 mg/L,while the optimized dosage of PAC/PA was 21.19/0.91 mg/L. According to the variance analysis, the interaction between AF/PA and PAC/PA were insignificant in macroscopic view. FT-IR spectrum indicated AF captured pollutant by means of CCO bond, PAC captured pollutant by δ CH, ／CC／ and δ CH. Overall, although the coagulation mechanism of AF was different from that of PAC, AF/PA showed better coagulation efficiency than PAC/PA in dye wastewater treatment.

关键词： Aluminum formate Polyamidine Dual-coagulation Phase analysis Interaction

A study on simultaneous removal of NO and SO2 by using sodium persulfate aqueous scrubbing

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Chinese Journal of Chemical Engineering 2018年第7期26卷 1536-1544页

作者： xue Kang Xiaoxun Ma Jian'an Yin Xuchun gao School of Chemical Engineering Northwest UniversityXi'an 710069China Chemical Engineering Research Center of the Ministry of Education(MOE)for Advanced Use Technology of Shanbei Energy Xi'an 710069China Shaanxi Research Center of Engineering Technology for Clean Coal Conversion Xi'an 710069China International Scientific and Technological Cooperation Base of the Ministry of Science and Technology(MOST)for Clean Utilization of Hydrocarbon Resources.Xi'an 710069 China Xi'an Shaangu Power Co. Ltd.Xi'an 710075China

Nitric oxide （NO） removal and sulfur dioxide （SO2） removal by sodium persulfate （Na2S2O8） were studied in a Bubble Column Reactor. The proposed reaction pathways of NO and SO2 removal are discussed. The effects of temperatures （35-90℃）, Na25208 （0.05-0.5 mol·L-1）, FeSO4 （0.5-5.0 m mol·L-1） and H2O2 （0.25 mol·L-1） on NO and SO2 removal were investigated. The results indicated that increased persulfate concentration led to increase in NO removal at various temperatures. SO2 was almost completely removed in the temperature range of 55-85 ℃. Fe2 ＋ accelerated persulfate activation and enhanced NO removal efficiency. At 0.2 mol· L- 1 Na2S2O8 and 0.5-1.0 mmol· L-1Fe2 ＋, NO removal of 93.5%-99% was obtained at 75-90 ℃, SO2 removal was higher than 99% at all temperatures. The addition of 0.25 mol. L i H202 into 0.2 mol·L-1· Na2S2O8 solution promoted NO removal efficiency apparently until utterly decomposition of H2O2, the SO2 removal was as high as 98.4% separately at 35 ℃ and 80 ℃.

关键词： Simultaneous removal of NO and SO2 Sodium persulfate Ferrous sulfate Hydrogen peroxide Active radicals

Thermo-hydro-mechanical coupled mathematical model for controlling the pre-mining coal seam gas extraction with slotted boreholes

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International Journal of Mining Science and Technology 2017年第3期27卷 473-479页

作者： xue Yi gao Feng gao Yanan Liang Xin Zhang Zhizhen Xing Yan State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining & Technology Xuzhou 221116 China School of Mechanics & Civil Engineering China University of Mining & Technology Xuzhou 221116 China Rock Mass Modeling and Computational Rock Mechanics Laboratories University of Arizona Tucson AZ 85721 USA

Drainage influence radius is the basic parameter for borehole arrangement, while the effect of high pressure water jet slotting technology on borehole drainage influence radius has not been studied systematically. In this paper, a fully thermo-hydro-mechanical(THM) coupled model which represents the non-linear responses of gas extraction was implemented to demonstrate the reliability of this model through history data matching. Based on this model, the susceptibilities of gas extraction with single slotted borehole, including the permeability, the gas pressure, the temperature, the coal adsorption characteristics and the radius of slot, were quantified through a series of simulations. The simulation results revealed that increasing the permeability, initial gas pressure and temperature could develop the influence radius of single slotted borehole. This finite element model and its simulation results can improve the understanding of the coal-gas interactions of underground gas drainage and provide a scientific basis for the optimization of drainage systems.

关键词： Coal seam gasGas extractionThermo-hydro-mechanical modelSlotted boreholes

Synthesis and Primary Research on Antitumor Activity of Three New Panaxadiol Fatty Acid Esters

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Chemical Research in Chinese Universities 2007年第2期23卷 176-182页

作者： ZHANG Chun-hong LI Xiang-gao gao Yu-gang ZHANG Lian-xue FU xue-qi Academy of Chinese Traditiorial Medicine Jilin Agricultural University Changchun 130118 P. R. China Edmond H. Fischer Signal Transduction Laboratory College of Life Sciences Jilin University Changchun 130021 P. R. China

For making use of Ginseng resources that exhibit an antitumor activity and for finding new anticancer drugs, three new fatty acid ester compounds： 3/β-acetoxy panaxadiol （ Ⅰ ）, 3β-palmitic acid aceloxy panaxadiol （ Ⅱ ） , and 3β-octadecanoic acid aceloxy panaxadiol（ Ⅰ , Ⅱ, and m） were synthesized with panaxadiol, diacetyl oxide, palmityl chloride and stearyl chloride, and their structures were determined via MS, ^13C NMR, IR, TLC, and so on. The molar yields of the three compounds are 75.14%, 79. 08%, and 72. 57%, respectively. Meanwhile, the antitumor activity of the three new panaxadiol fatty acid ester derivatives and panaxadiol was compared by using the method of MTT. Tumor cell used was Vero cell line. Positive control was 5-FU, blank was an RPMI1640 culture medium, negative control was an RPMI1640 culture medium and the solvent for drugs to be tested. Compound Ⅰ has the strongest antitumor activity followed by panaxadiol; compounds Ⅱ and Ⅲ have similar and weakest antitumor activities. Furthermore, the antitumor activities of the panaxadiol fatty acid ester derivatives show positive correlation with the concentration of the test group, but show no relationship with the molecular weight of fatty acid. The methods that are used to synthesize the three compounds with high yields and strong antitumor activities are simple and show a great potential for meeting the needs of industrial manufacture of these drugs.

关键词： Synthesis Panaxadiol fatty acid esters Anti-tumor activity

Photoexcitation induced magnetic phase transition and spin dynamics in antiferromagnetic MnPS_(3) monolayer

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npj Computational Materials 2023年第1期9卷 1246-1252页

作者： Yinlu gao xue Jiang Zhiyong Qiu Jijun Zhao State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology116024 DalianChina Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Dalian University of Technology)Ministry of Education116024 DalianChina Key Laboratory of Energy Materials and Devices(Liaoning Province) School of Materials Science and EngineeringDalian University of Technology116024 DalianChina

Antiferromagnetic spin dynamics is the key issue to develop spintronic *** adopt ab initio nonadiabatic molecular dynamics with spin–orbit-coupling(SOC)to investigate photoinduced spin dynamics in an antiferromagnetic semiconductor MnPS_(3) *** doping triggers MnPS_(3) from Néel antiferromagnetic to ferromagnetic phase at an experimentally achievable electron–hole pair density of 1.11×10^(14) cm−*** phase transition can be ascribed to the light-induced mid-gap states of S-p orbitals,which lower the electron excitation energy and strengthen the SOC effect between S-p and Mn-d *** excited S-p electrons first decay to the mid-gap states due to p–p electron–phonon-coupling and then relax to the spin-down Mn-d orbitals via *** a dramatic relaxation process prolongs the photogenerated carrier lifetime up to 648 fs,providing an explanation for the unusual optoelectronic performance of MnPS_(3).The reversible switching of magnetic order via optical means gives an important clue for information storage and highly efficient photocatalysts utilizing antiferromagnetic semiconductors.

关键词： dynamics excitation monolayer

Preparation and Characterization of Lepidocrocite Titanate Nanofibers

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Chemical Research in Chinese Universities 2013年第2期29卷 193-195页

作者： HOU Chang-min song Ming-dong xue Yun gao Xiao-xi YU Kai-feng Key Laboratory of Automobile Materials Ministry of Education College of Materials Science and Engineering Jilin University Changchun 130025 P. R. China State Key Laboratory of lnorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China

One-dimensional nanostructures have attracted much attention due to their potential application in a variety of novel devices11-31. Among the one-dimensional oxide nanomaterials reported, titanium oxide is of particular interest for its wide application in the fields of catalyst support[a], semiconductor photocatalystTM and sensor. Since the first report claiming the hydrothermal synthesis of titania nanobubes[7], there have been intensive studies on the growth and structure of this kind of peculiar nanotubes due to their potential photocatalytic applica- tion. Recent studies have shown that the structures of tita- nia nanotubes are complicated. The nanotube walls may not be TiO2.

关键词： Lepidocrocite titanate Nanofiber Hydrothermal synthesis

论农业适度规模经营视野下的承包地细碎化治理

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武汉大学学报（哲学社会科学版） 2025年第1期78卷 160-171页

作者：高圣平青海民族大学法学院青海西宁810007 中国人民大学法学院

发展农业适度规模经营是中国式农业农村现代化的必由之路,而承包地细碎化治理是发展农业适度规模经营中的关键一环。承包地细碎化治理模式中,“承包权不动,经营权连片”在法律上的技术路径是三权分置之下的土地经营权流转;“承包权互换... 详细信息

发展农业适度规模经营是中国式农业农村现代化的必由之路,而承包地细碎化治理是发展农业适度规模经营中的关键一环。承包地细碎化治理模式中,“承包权不动,经营权连片”在法律上的技术路径是三权分置之下的土地经营权流转;“承包权互换,承包地连片”在法律上的技术路径是两权分离之下的土地承包经营权互换。农村集体经济组织在承包地细碎化治理中发挥着统筹协调、组织服务等功能,按照法定的程序形成集体意志,还可以充当承包农户在土地经营权外部流转时的代理人,以破除集体行动困境。承包地的调整仅限于个别农户之间,并在符合法定条件的前提之下按照法定程序进行,不得以承包地细碎化治理为由扩大承包地调整的适用范围而进行“打乱重分”。

关键词：农业适度规模经营承包地细碎化农村集体经济组织承包地调整农地“三权分置” 土地承包经营权党的二十届三中全会精神

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