64,049 research outputs found
Pages_from_CCR-18-073.R2-Liu-_FINAL_SM1 – Supplemental material for The Labor Market Returns to For-Profit Higher Education: Evidence for Transfer Students
No full textSupplemental material, Pages_from_CCR-18-073.R2-Liu-_FINAL_SM1 for The Labor Market Returns to For-Profit Higher Education: Evidence for Transfer Students by Vivian Yuen Ting Liu and Clive Belfield in Community College Review</p
Liu Kang
No full textLiu Kang: Essays on Art and Culture is a testament to the inexorable passion of an artist who knew no boundaries. This collection of essays, which Liu Kang wrote over 44 years, offers an insight into the artist’s myriad interests as well as his contributions as a first generation Nanyang artist and art educator. Translated into English for this volume, Liu Kang’s essays are accompanied by commentaries and photographs of the artist-author and his subjects
Replication Data for: The Impact of Corporate Scale on Carbon Emission Efficiency: Empirical Analysis and Nonlinear Dynamics
No full text29 industries in the Chinese manufacturing sector from 2012 to 2021
Secoiridoids and triterpenoids from the traditional Tibetan medicine Gentiana veitchiorum and their immunosuppressive activity
No full textGuo, Kai, Zhou, Ting-Ting, Ren, Xue, Li, Dan, Hu, Hong, Liu, Yan-Chun, Liu, Yan, Li, Sheng-Hong (2021): Secoiridoids and triterpenoids from the traditional Tibetan medicine Gentiana veitchiorum and their immunosuppressive activity. Phytochemistry (112961) 192: 1-5, DOI: 10.1016/j.phytochem.2021.112961, URL: http://dx.doi.org/10.1016/j.phytochem.2021.11296
Fig. 1 in Secoiridoids and triterpenoids from the traditional Tibetan medicine Gentiana veitchiorum and their immunosuppressive activity
No full textFig. 1. Chemical structures of compounds 1–19.Published as part of Guo, Kai, Zhou, Ting-Ting, Ren, Xue, Li, Dan, Hu, Hong, Liu, Yan-Chun, Liu, Yan & Li, Sheng-Hong, 2021, Secoiridoids and triterpenoids from the traditional Tibetan medicine Gentiana veitchiorum and their immunosuppressive activity, pp. 1-5 in Phytochemistry (112961) 192 on page 2, DOI: 10.1016/j.phytochem.2021.112961, http://zenodo.org/record/825765
Review of Epoicocladius Šulc et Zavřel from China (Diptera, Chironomidae)
No full textYan, Chuncai, Liu, Ting, Cao, Wei, Zhang, Xinghua, Liu, Wenbin (2019): Review of Epoicocladius Šulc et Zavřel from China (Diptera, Chironomidae). Zootaxa 4590 (2): 289-295, DOI: 10.11646/zootaxa.4590.2.
Attitudes in the management of patients with dementia : comparison in doctors with and without special training
No full textAuthor name used in this publication: 雷逸华Author name used in this publication: 赖锦玉Author name used in this publication: 戴乐群Author name used in this publication: 丁淑文Author name used in this publication: 蔡坚Author name used in this publication: Liu JYWAuthor name used in this publication: Lai CAuthor name used in this publication: Ting STitle in Traditional Chinese: 比較有和沒有接受相關專業培訓的醫生對認知障礙症患者的治療態度2012-2013 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedPublisher permissio
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Understanding Structure-property Relationships between Tribological Properties and Chemistry of Phosphonium Ionic Liquids
No full textIonic liquids (ILs) have many advantages compared to conventional organic compounds in terms of biological, chemical, physical, and thermal properties. Therefore, ILs are considered as promising green engineering liquids for replacement of commonly used volatile organic compounds that offer a convenient solution to challenges associated with both solvent emission and catalytic recycling for a diverse range of applications. Here, we primarily focus on ILs as lubricants and lubricant additives. For the application in tribology as lubricants/lubricant additives, phosphonium ILs have been the rising star of the ILs family as they have been reported to exhibit lower wear and friction, as well as superior resistance to corrosion and tribo-corrosion. They are more stable in strongly basic media and more thermally stable than other ILs. Also, importantly, some phosphonium ILs can be less toxic and biodegradable than conventional organic compounds. The physico-chemical properties of phosphonium ILs are tunable depending upon the combination of cation and anion employed. Changes in properties in turn affect the performance of phosphonium ILs as lubricants and lubricant additives. Although there have been many investigations into the relationship between IL properties and ion chemistry/structure, the selection of cations and anions for phosphonium ILs is still very much trial-and-error. To optimize phosphonium ILs for lubrication, a full understanding of the relationship between chemistry/structure and material properties of is phosphonium ILs required. Toward this goal, classical and reactive molecular dynamics simulations are employed to study the molecular scale mechanisms underlying the mechanical response of phosphonium ILs with different cation and anion combinations.First, a non-reactive force field was used to predict bulk properties, including density, viscosity, and ionic conductivity. The accuracy of the modeling approach was evaluated by comparing to experiment/literature data. In particular, the effect of anions on these bulk properties was analyzed. The high accuracy in predicting bulk properties provided confidence for using this force field to investigate the wetting behavior and frictional behavior. Then the wetting behavior of phosphonium ILs on iron was studied for different cation-anion pairs to investigate the interaction of phosphonium ILs with solid surfaces. Results showed that contact angle was affected by the anion and increased as benzoate < salicylate < saccharinate longer alkyl chains in the cations led to lower contact angle. The trends were explained in terms of adhesive and cohesive energies in the simulations, and then correlated to the atomic scale differences between the anions and cations.
Since the effectiveness of lubricants depends on their frictional behavior, viscous friction that is entirely determined by the fluid properties was investigated for different phosphonium cations. It was found that viscous friction is highly related to cation alkyl chains and chain asymmetry under the same operating condition. A predictive model of viscous friction for tetraalkylphosphonium ILs was then established to capture the effect of cation moiety and operating conditions.
Lastly, in many applications, ILs are in direct contact with a metal surface and form a solid-liquid interface and possible corrosion could occur. The origins of corrosion behavior for trihexyltetradecylphosphonium benzoate and trihexyltetradecylphosphonium salicylate on ferrous surfaces was analyzed using reactive molecular dynamics simulations based on the types of bonding and orientation of the anions relative to the surface. It was found that salicylate had more possible bonding scenarios and was more likely to be tilted on the surface than benzoate, affecting the localization of surface-anion bonds and anion coverage density which could affect corrosion mechanisms.Overall, the results of these studies revealed direct correlations between tribological properties of phosphonium ILs and cation and anion chemistry. The structure-property relationship obtained from this study can ultimately be used to guide the design of high performance phosphonium ILs lubricants
The Stenus cirrus group (Coleoptera, Staphylinidae) in Fujian, East China
No full textLiu, Sheng-Nan, Tang, Liang, Luo, Yong-Ting (2018): The Stenus cirrus group (Coleoptera, Staphylinidae) in Fujian, East China. Zootaxa 4375 (1): 105-115, DOI: 10.11646/zootaxa.4375.1.
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