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Mesoscopic-Scale Numerical Investigation Including the Influence of Process Parameters on LPBF Multi-Layer Multi-Path Formation

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Computer Modeling in Engineering & Sciences 2021年第1期126卷 5-23页

作者： liu cao Institute for Systems Rheology School of Mechanical and Electrical EngineeringGuangzhou UniversityGuangzhou Higher Education Mega CenterGuangzhou510006China

As a typical laser additive manufacturing technology,laser powder bed fusion(LPBF)has achieved demonstration applications in aerospace,biomedical and other ***,how to select process parameters quickly and reasonably is still themain concern of LPBF *** order to quantitatively analyze the influence of different process parameters(laser power,scanning speed,hatch space and layer thickness)on the LPBF process,the multilayer and multi-path forming process of LPBF was predicted based on the open-source discrete element method framework Yade and the open-source finite volume method framework *** on the design of experiments method,a four-factor three-level orthogonal test scheme was designed,and the porosity and surface roughness data of each calculation scheme were *** analyzing the orthogonal test data,it was found that as the laser power increased,the porosity decreased,and as the scanning speed,hatch space,and layer thickness increased,the porosity *** addition,the influence of laser power and scanning speed on surface roughness showed a trend of decreasing first and then increasing,while the influence of scanning distance and layer thickness on surface roughness showed amonotonous increasing *** order of the influence of each process parameter on porosity was:scanning speed>laying thickness>laser power>hatch space,and the order of the influence of each process parameter on surface roughness was:hatch space>layer thickness>laser power>scanning *** the porosity of the part is most sensitive to scanning speed,and the surface roughness is the most sensitive to hatch *** above conclusions are expected to provide process control basis for actual LPBF production of the 316L stainless steel alloy.

关键词： Laser powder bed fusion process parameter porosity surface roughness orthogonal test method numerical simulation

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Influence of Al^(3+) on Hydrothermally Synthesized Xonotlite Whiskers in cao-SiO_2-H_2O System

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稀有金属材料与工程 2011年第S3期40卷 99-101页

作者： Li Jing, liu Fei, cao Jianxin Guizhou University, Guiyang 550003, China Guizhou Univ Sch Chem & Chem Engn Guiyang 550003 Peoples R China

Influences of Al3+ concentration on hydrothermally synthesized xonotlite whiskers were researched in this paper. The crystal phase composition and morphology of the products were analyzed and characterized using XRD and SEM techniques. The results indicate that Al3+ concentration have great impact on the crystal phase composition and morphology of the xonotlite whiskers in cao-SiO2-H2O system under the condition of initial cao/SiO2 mol ratio of 1.0, reactant concentration of 0.05 mol·L-1 , at 225 ℃ for 15 h. The main crystal phase of hydrothermally synthesized products had a phase transition from xonotlite to tobermorite, and the morphology changed from fibrous to tabular with increasing the concentration of Al3+ ion. At last, in order to prepare the pure xonotlite whiskers via hydrothermal synthesis in cao-SiO2-H2O system, the Al2O3 contents in raw materials should be less than 1%.

关键词： xonotlite whisker Al3+ ion hydrothermal synthesis

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玉泉胶囊对2型糖尿病合并非酒精性脂肪性肝病患者糖脂代谢功能的影响

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中国药业 2025年第1期34卷 86-89页

作者：范国洽曹柳刘珊河北省石家庄市第二医院河北石家庄050051

目的探讨玉泉胶囊对2型糖尿病(T2DM)合并非酒精性脂肪性肝病(NAFLD)患者糖脂代谢功能的影响。方法选取医院2023年2月至12月收治的T2DM合并NAFLD患者100例,按随机数字表法分为观察组和对照组,各50例,两组各剔除1例,最终各纳入49例。两组... 详细信息

目的探讨玉泉胶囊对2型糖尿病(T2DM)合并非酒精性脂肪性肝病(NAFLD)患者糖脂代谢功能的影响。方法选取医院2023年2月至12月收治的T2DM合并NAFLD患者100例,按随机数字表法分为观察组和对照组,各50例,两组各剔除1例,最终各纳入49例。两组患者均予二甲双胍,并结合饮食控制,观察组患者加用玉泉胶囊,两组患者均连续治疗6个月。结果观察组总有效率为87.76%,显著高于对照组的67.35%(P0.05)。结论玉泉胶囊治疗T2DM合并NAFLD的临床疗效较好,可有效改善患者的糖脂代谢功能,减轻胰岛素抵抗,延缓NAFLD进展,且安全性良好。

关键词：玉泉胶囊 2型糖尿病非酒精性脂肪性肝病糖脂代谢肝功能

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The origin and function of tumor-associated macrophages

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Cellular & Molecular Immunology 2015年第1期12卷 1-4页

作者： Yang liu Xuetao cao National Key Laboratory of Medical MolecularBiology & Department of Immunology Instituteof Basic Medical Sciences Chinese Academy ofMedical Sciences Beijing China

Identifying the cellular and molecular suppressors of the immune response against tumors is a popular topic in the field of tumor immunology that will provide new targets for the cancer immunotherapy. Suppressing the suppressor is a very attractive approach to enhan- cing the anti-tumor immune response by reversing the immunosuppression or blocking immune escape in the late stages of cancer progression.

关键词： origin function tumor-associated

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GRACE time-variable gravity and its application to geoscience:Quantitative analysis of relevant literature

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Earth and Planetary Physics 2023年第2期7卷 295-309页

作者： cao liu WenKe Sun College of Earth and Planetary Science University of Chinese Academy of SciencesBeijing 100049China

The Gravity Recovery and Climate Experiment(GRACE)is the most important gravity satellite to date in human *** its launch in 2002,GRACE time-varying gravity has had an unprecedented impact on earth science and has generated revolutionary *** of natural phenomena such as climate warming,glacial melting,sea level rise,and earthquakes,earth science research has become an increasingly popular discipline in recent *** article summarizes the importance of GRACE time-varying gravity,its application to geoscience,and its *** analyzed the historical development and current status of GRACE time-varying gravity as well as research hotspots by searching the literature in the core collection databases of the China National Knowledge Infrastructure and the Web of Science over the past 20 *** CiteSpace and VOSviewer software packages were applied with reference to the principle of literature *** investigation and analysis of characteristic indexes,such as the numbers of publications,co-occurrence of keywords,and co-citation of documents,uncovered the wide application and promotion of gravity satellites,especially GRACE time-varying gravity,in earth *** results showed that the number of publications addressing GRACE data and time-varying gravity theory is increasing annually and that the USA,China,and Germany are the main *** Chinese Academy of Sciences,the National Aeronautics and Space Administration of the United States,and the Helmholtz Association of German Research Centres rank among the top three institutions in the world in terms of producing the most publications on this *** found that GRACE time-varying gravity plays unique roles in measuring changes in terrestrial water storage changes,ice and snow melting and sea level changes,and(co)seismic gravity changes,as well as in promoting other disciplines.

关键词： Gravity Recovery and Climate Experiment(GRACE) Gravity Recovery and Climate Experiment Follow-On(GRACE-FO) time-varying gravity bibliometry mass change CiteSpace VOSviewer

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HYBRID SIMULATION OF THE HYDRAULIC CHARACTERISTICS AT RIVER AND LAKE CONFLUENCE

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Journal of Hydrodynamics 2011年第1期23卷 105-113页

作者： liu Shi-he cao Bing College of Water Resource and Hydropower Wuhan University Wuhan 430072 China

The hydraulic characteristics at the confluence reach of river and lake are influenced by multiple factors such as inflow,topography and vegetation resistance,and are very *** this article,the confluence reach of Yangtze River and Dong-ting Lake is selected as a special example and a hybrid model is built to study the flow at this confluence,with the consideration of the interactions between aquatic vegetation and *** tests and calculations show that the model is effective and highly *** simulations show that the separation levee at the confluence reach may change the discharge capacity in the flood plain,which would be enhanced in the upper reach of the levee,hardly changed in the middle reach and reduced at the lower ***,the separation levee also limits the water exchange between the Yangtze River and Dong-ting Lake.

关键词： confluence reach hybrid model separation levee discharge capacity in flood plain

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Vortical structures and wakes of a sphere in homogeneous and density stratified fluid

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Journal of Hydrodynamics 2021年第2期33卷 207-215页

作者： liu-shuai cao Feng-lai Huang Cheng liu De-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil Engi-neeringShanghai Jiao Tong UniversityShanghai 200240China Ocean College Zhejiang UniversityZhoushan 316021China

Vortical structures and wakes of bluff bodies in homogenous and stratified environment are common and important in ocean *** on the Boussinesq approximation,a thermocline model is proposed to deal with the variable density stratified fluid,and implemented in the commercial software Simcenter STAR-CCM+*** improved delayed detached eddy simulation(IDDES)modeling method is adopted to resolve the coherent vortical structures and turbulent wakes precisely and *** conditions consisting of one homogenous and three stratified fluid cases with different density gradient past a sphere at Reynolds number 3700 are *** show that density stratification has a great impact on the vortical structures,the vertical motion is suppressed and internal waves will be induced and propagated,which is very different with that of homogenous *** the stratification strength increases,the vortical structures are gradually flattened,the asymmetry and anisotropy between vertical and horizontal motions are enhanced.

关键词： Vortical structures wakes sphere homogenous stratified fluid

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Generation and Photocatalytic Activities of Bi@Bi2O3 Microspheres

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Nano Research 2011年第5期4卷 470-482页

作者： Xiangwen liu Huaqiang cao Jiefu Yin Department of Chemistry Tsinghua University Beijing 100084 China

Composite Bi@Bi2O3 microspheres have been synthesized via a microwave-assisted solvothermal route. The Bi@Bi2O3 microspheres had a narrow size distribution in the range 1.2-2.8 mm. Glucose was selected as the reductant, BiCl3 as the bismuth source, and ethylene glycol （EG） as the solvent in the synthesis system. The as-synthesized sample was characterized by X-ray diffraction （XRD）, Raman spectroscopy, X-ray photoelectron spectroscopy （XPS）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, particle diameter distribution, energy dispersive X-ray spectroscopy （EDS）, ultraviolet-visible （UV-vis） spectroscopy, and photoluminescence （PL） spectroscopy. The photocatalytic activities of the Bi@Bi2O3 microspheres were evaluated by the photodegradation of rhodamine B （RhB） and methyl orange （MO） dyes under UV light irradiation. The degradation reached -96.6% for RhB and 100% for MO after 4 h reaction in the presence of the as-synthesized Bi@Bi2O3 microspheres.

关键词： Bismuth bismuth oxide photocatalysis microspheres solvothermal method

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Formation of sulfur oxide groups by SO_(2) and their roles in mercury adsorption on carbon-based materials

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Journal of Environmental Sciences 2022年第9期34卷 44-49页

作者： Fenghua Shen Shudan He Junyuan Li cao liu Kaisong Xiang Hui liu School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Changsha 410083China School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

The presence of SO_(2) display significant effect on the mercury(Hg) adsorption ability of carbon-based sorbent. Yet the adsorption and oxidation of SO_(2) on carbon with oxygen group, as well as the roles of different sulfur oxide groups in Hg adsorption have heretofore been unclear. The formation of sulfur oxide groups by SO_(2) and their effects on Hg adsorption on carbon was detailed examined by the density functional theory. The results show that SO_(2) can be oxidized into SO_(2) by oxygen group on carbon surface. Both C-SO_(2) and C-SO_(2)can improve Hg adsorption on carbon site, while the promotive effect of C-SO_(2) is stronger than C-SO_(2). Electron density difference analyses reveal that sulfur oxide groups enhance the charge transfer ability of surface unsaturated carbon atom, thereby improving Hg adsorption. The experimental results confirm that surface active groups formed by SO_(2) adsorption is more active for Hg adsorption than the groups generated by SO_(2).

关键词： Sulfur dioxide Mercury Carbon sorbent Adsorption mechanism

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Multifunctional high-fluorine-content molecule with high dipole moment as electrolyte additive for high performance lithium metal batteries

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Rare Metals 2022年第3期41卷 726-729页

作者： Xi Tang Wen-Chao Zhang liu-Yue cao Institute of Environmental Engineering School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China School of Chemical and Biomolecular Engineering the University of SydneyDarlingtonNSW 2006Australia

Lithium metal batteries (LMBs) have been regarded as the most promising technology beyond lithium-ion batteries to meet the ever-increasing demand for high-energy and highpower secondary battery technologies. Challenges such as poor electrochemical stability of electrolytes, dendritic Li plating, gradual cathode structure degradation.

关键词： battery lithium fluorine

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