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The physicochemical properties of some imidazolium-based ionic liquids and their binary mixtures

Science China Chemistry 2012年第8期55卷 1509-1518页

作者： NING Hui HOU MinQiang MEI QingQing liu yuanhui YANG DeZhong HAN BuXing Beijing National Laboratory for Molecular Sciences Key Laboratory of ColloidInterface and Chemical ThermodynamicsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China

The density, viscosity and conductivity of ionic liquids （ILs）, 1-octyl-3-methylimidazolium tetrafluoroborate （[omim][BF4]）, 1-octyl-3-methylimidazolium chloride （[omim][C1]）, 1-hexyl-3-methylimidazolium tetrafluoroborate （[hmim] BF4]）, 1-hexyl- 3-methylimidazolium chloride （[hmim][C1]）, 1-hexyl-3-methylimidazolium hexafluorophosphate （[hmim][PF6]）, and the [omim][BF4] ＋ [omim][Cl], [hmim][BF4] ＋ [hmim][C1], and [hmim][PF6] ＋ [hmim][C1] binary mixtures were studied at dif- ferent temperatures. It was demonstrated that the densities of both the neat ILs and their mixtures varied linearly with temper- ature. The density sensitivity of a binary mixture is between those of the two components. The excess molar volumes （l/e） of [hmim][BF4] ＋ [hmim][C1] and [hmim][PF6] ＋ [hmim][C1] mixtures are positive in the whole composition range. For [omim][BF4] ＋ [omim][C1], the VE is also positive in the [omirn][C1]-rich region, but is negative in the [omim][BF4]-rich re- gion. The viscosity or conductivity of a mixture is in the intermediate of those of the two neat ILs. For all the neat ILs and the binary mixtures studied, the order of conductivity is opposite to that of the viscosity. The Vogel-Tammann-Fulcher （VTF） equations can be used to fit the viscosity and conductivity of all the neat ILs and the binary mixtures. The neat ILs and their mixtures obey the Fractional Walden Rule very well, and the values of the Walden slopes are all smaller than unit, indicating obvious ion associations in the neat ILs and the binary mixtures.

关键词： ionic liquids density viscosity conductivity Walden rule

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Stochastic Performance Assessment of the Controller with Complex Deterministic Trend Output and its Application 36

Stochastic Performance Assessment of the Controller with Com...

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第36届中国控制会议

作者： yuanhui liu Yonggang Li Yalin Wang Ling Li School of Information Science and Engineering Central South University

ISBN: (纸本)9781538629185

There is a certain type controller that has unknown and complex deterministic trend output of changing with time slowly in actual *** the traditional minimum variance criterion can’t be used to evaluate the stochastic performance of the controller *** this paper presents a method to address the difficulties in such case,which combines wavelet technology and minimum variance criterion for stochastic performance ***,wavelet technology(WA method) is adopted to separate stochastic portion from the output time *** then the stochastic portion is modeled and ***,stochastic performance of the controller is assessed based on traditional minimum variance *** effectiveness of the proposed method is verified through *** method can avoid over-differencing when the stochastic portion is extracted by using difference method(DI method),and realizes accurate and reliable assessment for stochastic performance of the controller.

关键词： controller stochastic performance assessment complex deterministic trend output wavelet technology minimum variance criterion

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Soil Biogeochemical Cycle Couplings Inferred from a Function-Taxon Network

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Research 2021年第1期2021卷 432-441页

作者： Bin Ma Erinne Stirling yuanhui liu Kankan Zhao Jizhong Zhou Brajesh K.Singh Caixian Tang Randy A.Dahlgren Jianming Xu Institute of Soil and Water Resources and Environmental Science College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment Zhejiang UniversityHangzhou 310058China Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 310058China Acid Sulfate Soils Centre School of Biological SciencesThe University of AdelaideAdelaideSA 5005Australia Institute for Environmental Genomics Department of Microbiology and Plant Biologyand School of Civil Engineering and Environmental SciencesUniversity of OklahomaNormanOKUSA Global Centre for Land-Based Innovation Hawkesbury Institute for the EnvironmentWestern Sydney UniversityPenrithNSW 2750Australia Department of Animal Plant and Soil SciencesLa Trobe UniversityMelbourne CampusBundooraVIC 3086Australia Department of Land Air and Water ResourcesUniversity of CaliforniaDavis95616 CAUSA

Soil biogeochemical cycles and their interconnections play a critical role in regulating functions and services of environmental ***,the coupling of soil biogeochemical processes with their mediating microbes remains poorly ***,we identified key microbial taxa regulating soil biogeochemical processes by exploring biomarker genes and taxa of contigs assembled from metagenomes of forest soils collected along a latitudinal transect(18°N to 48°N)in eastern *** environmental and soil factors,soil pH was a sensitive indicator for functional gene composition and diversity.A function-taxon bipartite network inferred from metagenomic contigs identified the microbial taxa regulating coupled biogeochemical cycles between carbon and phosphorus,nitrogen and sulfur,and nitrogen and *** results provide novel evidence for the coupling of soil biogeochemical cycles,identify key regulating microbes,and demonstrate the efficacy of a new approach to investigate the processes and microbial taxa regulating soil ecosystem functions.

关键词： soil forest Soil

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Study on the Free Radical Scavenging Activity of Sea Cucumber (Paracaudina chinens var.) Gelatin Hydrolysate

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Journal of Ocean University of China 2007年第3期6卷 255-258页

作者： ZENG Mingyong XIAO Feng ZHAO yuanhui liu Zunying LI Bafang DONG Shiyuan College of Food Science and Engineering Ocean University of China Qingdao 266003 P. R. China

Gelatin from the sea cucumber(Paracaudina chinens var.) was hydrolyzed by bromelain and the hydrolysate was found to have a high free radical scavenging activity. The hydrolysate was fractionated through an ultrafiltration membrane with 5 kDa molecular weight cutoff(MWCO). The portion(less than 5 kDa) was further separated by Sephadex G-25. The active peak was col-lected and assayed for free radical scavenging activity. The scavenging rates for superoxide anion radicals(O2·-) and hydroxyl radi-cals(·OH) of the fraction with the highest activity were 29.02% and 75.41%,respectively. A rabbit liver mitochondrial free radical damage model was adopted to study the free radical scavenging activity of the fraction. The results showed that the sea cucumber gelatin hydrolysate can prevent the damage of rabbit liver and mitochondria.

关键词： Paracaudina chinens var. gelatin hydrolysate free radical scavenging activity mitochondria

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Theoritical and Experimental Studies on the Phase Equilibria and Phase Diagrams on the Salt-Water Systems

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 307-309页

作者： DENG Tianlong WANG Shiqiang MENG Lingzong GUO Yafei YU Xiaoping liu yuanhui Tianjin Key Laboratory of Marine Resources and Chemistry College of Marine Science and Engineering at Tianjin University of Science and Technology

1 Introduction Salt lakes are widely distributed in the world,and salt lakes in China are mainly located in the area of the Qinghai-Xizang(Tibet),and the Autonomous Regions of Xinjiang and Inner *** are more than 700s... 详细信息

关键词： stable phase equilibrium metastable phase equilibrium experimental phase diagram calculating phase diagram phase diagram calculation

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Advances in Graphene‑Based Electrode for Triboelectric Nanogenerator

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Nano-Micro Letters 2025年第1期17卷 378-403页

作者： Bin Xie yuanhui Guo Yun Chen Hao Zhang Jiawei Xiao Maoxiang Hou Huilong liu Li Ma Xin Chen Chingping Wong State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment Guangdong University of TechnologyGuangzhou 510006People’s Republic of China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006People’s Republic of China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

With the continuous development of wearable electronics,wireless sensor networks and other micro-electronic devices,there is an increasingly urgent need for miniature,flexible and efficient nanopower generation *** nanogenerator(TENG)technology can convert small mechanical energy into electricity,which is expected to address this *** the core component of TENG,the choice of electrode materials significantly affects its *** metal electrode materials often suffer from problems such as durability,which limits the further application of ***,as a novel electrode material,shows excellent prospects for application in TENG owing to its unique structure and excellent electrical *** review systematically summarizes the recent research progress and application prospects of TENGs based on graphene *** precision processing methods of graphene electrodes are introduced,and the applications of graphene electrode-based TENGs in various scenarios as well as the enhancement of graphene electrodes for TENG performance are *** addition,the future development of graphene electrode-based TENGs is also prospectively discussed,aiming to promote the continuous advancement of graphene electrode-based TENGs.

关键词： Triboelectric nanogenerator Precision processing Graphene electrode Self-powered sensor

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罗伯特·福克斯的十九世纪法国科学史新叙事

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自然辩证法通讯 2023年第12期45卷 56-62页

作者：刘元慧清华大学科学史系北京100084

衰退论叙事是19世纪法国科学史的经典叙事,罗伯特·福克斯和他同时代的法国近现代科学史学者都为超越旧叙事作出努力。福克斯的集大成之作《学者与国家》可以视为对衰退论叙事的一次全面回应,他通过恢复衰退论的发生语境、重建19世纪法... 详细信息

衰退论叙事是19世纪法国科学史的经典叙事,罗伯特·福克斯和他同时代的法国近现代科学史学者都为超越旧叙事作出努力。福克斯的集大成之作《学者与国家》可以视为对衰退论叙事的一次全面回应,他通过恢复衰退论的发生语境、重建19世纪法国科学实践多样性来回应旧叙事。与此同时,他通过建立以公共科学为线索的新叙事来超越旧叙事,描述科学在法国社会中的崛起,从而揭示了19世纪法国科学形态的根本转变,创造了一个综合的法国科学文化史。

关键词：十九世纪法国科学罗伯特·福克斯《学者与国家》公共科学科学文化史

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Comparison of different risk scores for predicting contrast induced nephropathy and clinical outcomes after primary percutaneous coronary intervention

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中国循环杂志 2016年第Z1期31卷 -页

作者： yuanhui liu Ning Tan Jiyan Chen Department of Cardiology Guangdong Cardiovascular Institute Guangdong Provincial Key Laboratory of Coronary Heart Disease Prevention Guangdong General Hospital Guangdong Academic of Medical Sciences Guangzhou. China

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两类跳频序列集时频二维汉明相关性的分析

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系统工程与电子技术 2017年第9期39卷 2132-2136页

作者：刘元慧许成谦燕山大学信息科学与工程学院河北秦皇岛066004 燕山大学理学院河北秦皇岛066004

多普勒频移对现代扩频通信系统性能有着重要影响,设计跳频序列时需考虑具有时延和多普勒频移情形下序列的相关性。研究了跳频序列集时频最大周期汉明相关值的理论界,计算了Cai跳频序列集的时频二维周期汉明相关值,用该理论界检验了这类... 详细信息

多普勒频移对现代扩频通信系统性能有着重要影响,设计跳频序列时需考虑具有时延和多普勒频移情形下序列的相关性。研究了跳频序列集时频最大周期汉明相关值的理论界,计算了Cai跳频序列集的时频二维周期汉明相关值,用该理论界检验了这类跳频序列集的二维周期汉明相关值,并进一步得到了部分达到最优的跳频序列;最后对多项式同余跳频序列集的二维周期汉明相关值进行了分析。

关键词：跳频序列多普勒频移时频二维周期汉明相关值

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Dilution enthalpies of LiBO2 and LiB5O8 aqueous solutions at 298.15 K and the application of ion-interaction model

Dilution enthalpies of LiBO2 and LiB5O8 aqueous solutions at...

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中国化学会第七届全国热分析动力学与热动力学学术会议

作者： Fei Yuan Long Li Yafei Guo yuanhui liu Tianlong Deng Tianjin Key Laboratory of Marine Resources and Chemistry College of Chemical Engineering and Materials ScienceTianjin University of Science and Technology

Boron and its compounds play an important role in modern energy and material sciences including permanent magnetic,superconducting,boride cermets,boron-based fuel-rich propellants and borate whisker materials. Lithium metaborate is a high-quality piezoelectric material for mobile communication,and lithium pentaborate can be used as a high quality laser material and so on. In order to establish the thermodynamic model of brine systems and to utilize the valuable salt lake resources effectively and comprehensively,heat enthalpy knowledge on the salt lake system containing lithium and borate ions is of great significance not only to understand the ion-interaction between solute-solvent and solute-solute as well as the effects of ion strength,temperature on excess free energy,but also to provide fundamental data in predicting the crystallizing and evaporating behaviors of these salt lakes. Studies on the thermodynamic properties of the salt lake brine systems containing lithium and borate ions is of great significance to establish the solubility predictive model of electrolytes to promote the industrial exploitation of those valuable salt lake resources effectively and *** dilution enthalpies of LiBO (aq) from 0.1 to 0.8 mol·kg and LiBO (aq)from 0.3 to 0.9 mol·kg at 298.15 K and 101.325 kPa were investigated using the microcalorimeter BT *** apparent molar enthalpies on the two species of lithium borates were obtained on the basis of experimental data,and then the diagrams of their apparent molar enthalpy against molality for LiBO (aq) and LiBO (aq) were also *** to Pitzer ion-interaction equations,the Pitzer single-salt parameters (β(0)L),β(1)L),β(2)L),C) for LiBO and Li BO were obtained,which are not reported in the *** calculated apparent molar enthalpies for Li BO (aq) and LiBO(aq) agree well with the experimental values,which indicate that the Pitzer single parameters of Li BO and LiBO obtain are reliable.

关键词： Thermal analysis,Thermodynamics,Dilution enthalpy Apparent molar enthalpy Pitzer model Lithium metaborate lithium pentaborate

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