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Experimental research on stabilities, thermophysical properties and heat transfer enhancement of nanofluids in heat exchanger systems

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Chinese Journal of Chemical Engineering 2018年第12期26卷 2420-2430页

作者： Cong Qi Maoni Liu Guiqing Wang Yuhang Pan lin Liang School of Electrical and Power Engineering China University of Mining and Technology

Stable TiO_2–water nanofluids are prepared by a two-step method, stabilities of nanofluids are investigated by precipitation method and transmittance method respectively, and thermal conductivities and viscosities are also measured. An experimental system for studying the heat transfer enhancement of nanofluids is established,and heat transfer and flow characteristics of TiO_2–water nanofluids in heat exchanger systems with a triangular tube and circular tube are experimentally studied. The effects of nanoparticle mass fractions(ω = 0.1 wt%–0.5 wt%) and Reynolds numbers(Re = 800–10000) on the heat transfer and flow performances of nanofluids are analyzed. Fitting formulas for Nusselt number and resistance coefficient of nanofluids in a triangular tube are put forward based on the experimental data. The comprehensive performances of nanofluids in a triangular tube are investigated. It is found that nanofluids in a triangular tube can significantly improve the heat transfer performance at the cost of a small increase in resistance coefficient compared with that in a circular tube, especially the resistance coefficients are almost the same between different nanoparticle mass fractions at turbulent flow. It is also found that the comprehensive evaluation index η decreases with Reynolds number at laminar flow but a critical maximum value appears at turbulent flow.

关键词： Heat transfer Nanoparticles Turbulent flow Triangular tube Comprehensive evaluation index

The First Total Synthesis of 16-Hydroxygeranylgeraniol

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Chemical Research in Chinese Universities 2004年第1期20卷 40-41页

作者： PENGLi-zeng MEITian-sheng ZHANGTao ZHANGFeng-zhi LIYu-lin NationalLaboratoryofAppliedOrganicChemistryandInstituteofOrganicChemistry LanzhouUniversityLanzhou730000P.R.China

The facile synthesis of 16-hydroxygeranylgeraniol(1), a naturally existing alicyclic diterpene, by alkylation reaction of allylic iodide(3) with phenyl sulfone(4), is described.

关键词： Total synthesis 16-Hydroxygeranylgeraniol Diterpene.

Surface control of layered double hydroxides by in-situ initiating&terminating polymerization

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Nano Research 2022年第2期15卷 1538-1546页

作者： Dan Tong Yuquan Zhu Kaitao Li Kuilin Du Wendi Liu Yanjun lin State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China School of Chemical Engineering Qinghai UniversityXining 810016China

Appropriate surface modification or functionalization is prerequisite for the application of inorganic *** surface control between organic and inorganic interface plays an important role in constructing organic-inorganic ***-situ polymerization has been extensively studied to improve the compatibility and dispersibility of inorganic nanoparticles,but the polymerized nanoparticles tend to concatenate and form large composites,restricting further ***,uniform and dense polyacrylic acid(PAA)membranes have been grafted on layered double hydroxide(LDH)nanosheets via an in-situ initiating and terminating radical graft polymerization *** initiating and terminating on the same particle,the size,morphology and density of grafted PAA onto the surface of LDHs can be controlled by adjusting the ratio of initiated sites to terminated sites,the amount of redox initiator or *** a result,with only 17.33%organic grafting ratio,PAA@LDHs with largely improved compatibility can be monodispersed in polyethylene(PE)and polyvinyl chloride(PVC)matrices,which is determined by a fluorescence microscope technique.

关键词： surface control in-situ polymerization organic-inorganic interface layered double hydroxides

Secular decreasing trends in gastric cancer incidence in Taiwan:A population-based cancer registry study

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World Journal of Gastroenterology 2021年第34期27卷 5764-5774页

作者： Yen-Tzeng lin Chun-Ju Chiang Ya-Wen Yang Shih-Pei Huang San-lin You School of Medicine College of MedicineFu Jen Catholic UniversityNew Taipei City 242008TaiwanChina Institute of Epidemiology and Preventive Medicine College of Public HealthNational Taiwan UniversityTaipei 10617TaiwanChina Department of Medical Education&Bioethics Graduate Institute of Medical Education&BioethicsNational Taiwan University College of MedicineTaipei 10051TaiwanChina School of Medicine&Big Data Research Center Fu Jen Catholic UniversityNew Taipei City 242008TaiwanChina

BACKGROUND Gastric cancer remains a leading cause of cancer death *** Taiwan,gastric cancer is the sixth leading cause of cancer mortality in both males and *** To evaluate secular trends in gastric cancer incidence according to age,sex,and Helicobacter pylori(***)treatment in *** In this population-based study,we used the national Taiwan Cancer Registry *** percent changes in incidence rates were used to describe secular trends in incidence rates and sex ratios of gastric cancer in ***’s product-moment correlation coefficients were used to analyze the correlation between annual age-adjusted incidence rates and the annual number of patients treated with antibiotic therapy for *** *** The annual percent changes showed continuously decreasing rates of gastric cancer among both males and ***,the decreasing trends differed by sex,with an annual percent change of-2.58%in males and-2.14%in *** age-specific incidence rates increased with *** the same age group,more recent time periods showed lower incidence rates than greater time ***,the sex ratio was lower in later birth cohorts than in earlier birth ***-adjusted incidence rates substantially decreased with increasing numbers of patients being treated with antibiotic therapy for *** infection during 2005 to 2016(r=0.72).CONCLUSION We observed steadily decreasing trends with differential sex ratios in the incidence of gastric cancer in *** results support *** eradication programs in Taiwan.

关键词： Gastric cancer Population-based study Taiwan Cancer Registry Sex difference Helicobacter pylori Helicobacter pylori eradication

Parallel Computing Based Solution for Reliability-constrained Distribution Network Planning

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Journal of Modern Power Systems and Clean Energy 2024年第4期12卷 1147-1158页

作者： Yaqi Sun Wenchuan Wu Yi lin Hai Huang Hao Chen State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Sichuan Energy Internet Research Institute Tsinghua UniversityChengduChina State Grid Fujian Electric Power Co.Ltd. FuzhouChina

The main goal of distribution network(DN)expansion planning is essentially to achieve minimal investment con-strained by specified reliability *** reliability-constrained distribution network planning(RcDNP)problem can be cast as an instance of mixed-integer linear programming(MILP)which involves ultra-heavy computation burden especially for large-scale *** this paper,we propose a parallel computing based solution method for the RcDNP *** RcDNP is decomposed into a backbone grid and several lateral grid problems with ***,a parallelizable augmented Lagrangian algorithm with acceleration method is developed to solve the coordination planning *** lateral grid problems are solved in parallel through coordinating with the backbone grid planning ***-Seidel iteration is adopted on the subset of the convex hull of the feasible region constructed by *** mild conditions,the optimality and convergence of the proposed method are *** tests show that the proposed method can significantly reduce the solution time and make the RcDNP applicable for real-worldproblems.

关键词： Distribution network expansion planning reliability parallel computing

Multi-View Dynamic Kernelized Evidential Clustering

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IEEE/CAA Journal of Automatica Sinica 2024年第12期11卷 2435-2450页

作者： Jinyi Xu Zuowei Zhang Ze lin Yixiang Chen Weiping Ding the Software Engineering Institute East China Normal University Shanghai Key Laboratory of Trustworthy Computing East China Normal University IEEE the School of Automation Northwestern Polytechnical University the School of Artificial Intelligence and Computer Science Nantong University the Faculty of Data Science City University of Macau

It is challenging to cluster multi-view data in which the clusters have overlapping areas. Existing multi-view clustering methods often misclassify the indistinguishable objects in overlapping areas by forcing them into single clusters, increasing clustering errors. Our solution, the multi-view dynamic kernelized evidential clustering method(MvDKE), addresses this by assigning these objects to meta-clusters, a union of several related singleton clusters, effectively capturing the local imprecision in overlapping areas. MvDKE offers two main advantages: firstly, it significantly reduces computational complexity through a dynamic framework for evidential clustering, and secondly, it adeptly handles non-spherical data using kernel techniques within its objective function. Experiments on various datasets confirm MvDKE's superior ability to accurately characterize the local imprecision in multi-view non-spherical data, achieving better efficiency and outperforming existing methods in overall performance.

关键词： Evidential clustering imprecision characterizing kernel technique multi-view clustering

Energetic Argument for Bimodal Black Hole Accretion discs

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Chinese Physics Letters 2002年第10期19卷 1562-1564页

作者： lin Yi-Qing Lu Ju-Fu Gu Wei-Min Department of Physics Xiamen University Xiamen 361005 Service d'Astrophysique CEA/DSM/DAPNIA CE-Saclay 91191 Gif-sur-Yvette France

Based on simple energetic considerations, we show that two crucial ingredients of bimodal black hole accretion discs, namely the sonic point and the transition radius, can be determined from the disc constant paramete... 详细信息

关键词： Gravitation

Synthesis and Structural Characterization of Mono-and Di-nuclear Zinc(Ⅱ) Coordination Compounds of Triphenylphosphoniopropionate

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Chemical Research in Chinese Universities 2005年第4期21卷 391-395页

作者： LISong-lin HOUJian-feng JIANGNing-yi MakThomasC.W. DepartmentofChemistry TianjinUniversityTianjin300072P.R.China DepartmentofChemistry TheChineseUniversityofHongKongShatinNewTerritoriesHongKongP.R.China

Two novel coordination compounds of Zn(Ⅱ) with Ph_3P+(CH_2)_2CO-_2(L), namely, [ZnL_4(H_2O)_2]·(ClO_4)_2·2H_2O(compound 1) and [Zn_2Cl_4(μ-L-O,O′)_2](compound 2), have been prepared. The single crystal X-ray structure analysis of these compounds indicates that in compound 1 the Zn(Ⅱ) atom is coordinated by four monodentate carboxylato groups on the equatorial plane and two aqua ligands occupy the axial coordination positions. The pendant oxygen atoms form strong hydrogen bonds with the aqua molecules which results in the stability of this structure. In compound 2, two Zn(Ⅱ) atoms are bridged by a pair of carboxylato groups, showing a skew-bridge mode, and thus enabling a long Zn(Ⅱ)…Zn(Ⅱ) separation. As we know, it is a dinuclear coordination compound with the longest Zn…Zn separation.

关键词： Triphenylphosphoniopropionate Quaternary phosphonium betaine Mono-and Di-nuclear Zn(Ⅱ) coordination compounds Crystal structure

COMBINATION OF CFD AND CSD PACKAGES FOR FLUID-STRUCTURE INTERACTION

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Journal of Hydrodynamics 2008年第6期20卷 756-761页

作者： WANG Yi-wei lin Yong-wen Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China China Academy of Space Technology Beijing 100094 China

In this article the UDF script file in the Fluent software was rewritten as the ＂connecting file＂ for the Fluent and the ANSYS/ABAQUS in order that the joined file can be used to do aero-elastic computations. In this way the fluid field is computed by solving the Navier-Stokes equations and the structure movement is integrated by the dynamics directly. An analysis of the computed results shows that this coupled method designed for simulating aero-elastic systems is workable and can be used for the other fluid-structure interaction problems.

关键词： CFD/CSD fluid-structure interaction aero-elasticity fluttering