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Discontinuous solid solutions of anthracene-phenanthrene:Thermodynamics and crystallization kinetics

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Particuology 2022年第1期20卷 68-76页

作者： Zaixiang Zhang ling zhou Qiuxiang Yin School of Chemical Engineering and Technology State Key Laboratory of Chemical EngineeringTianjin UniversityTianjin 300072People's Republic of China

We explored such issues as the formation mechanism,structure and propriety of the solid solutions of anthracene(ANT)-phenanthrene(PHE).Solution crystallization and solid-state grinding were employed to prepare solid solutions under different *** thermal behavior and PXRD scanning results revealed the formation of discontinuous solid solutions,whose melting points and crystal lattices varied linearly with mixed *** with Materials Studio,the formation possibility of solid solutions were investigated by evaluating the change of the *** crystal morphology of the solid solutions have a positive correlation with the change of the major ***,the solution crystallization process of solid solution were studied using the population balance model.

关键词： Discontinuous solid solutions Thermal proprieties Crystal structure Morphology Crystallization kinetics

Unique Properties of Heat Generation in Nanoscale Systems

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Chinese Physics Letters 2011年第12期28卷 303-305页

作者： zhou Li-ling Department of Physics Jiujiang UniversityJiujiang 332005

We study the unique properties of current-induced heat generation Q in nanostructures and its absence in macroscopic bulks.A lead−quantum dot-lead system is taken into consideration and it is found that its unique properties stem from energy quantization of the system and arise only under conditions of low temperature and weak dot-lead *** relation of Q∝I(I is the system current)fails in nanosystems,while the Q peaks align with peaks of phonon−assisted current under small *** a result,one can expect a large current accompanied by relatively small Q when the elastic current peak does not coincide with the phonon-assisted one,the ideal working condition for a nanostructure.

关键词： system macroscopic relation

Influence of sub boundary layer vortex generator height and attack angle on cross-flows in the hub region of compressors

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Chinese Journal of Aeronautics 2022年第8期35卷 30-44页

作者： Hao FU ling zhou Lucheng JI School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Institute for Aero Engine Tsinghua UniversityBeijing 100084China

It has been recently shown that Sub Boundary layer Vortex Generator(SBVG,abbreviated as VG hereafter)can suppress the Cross-Flow(CF),and therefore,can eliminate corner separation and increase aerodynamic loading when installed on the end wall inside middle-load compressor ***,when VGs are applied in high-load compressors,it is difficult to achieve ideal *** is because the definition of the VG attack angle in the presence of CF in existing research is confusing,and the stronger CF in high-load compressors worsens the problem and results in an improper design and optimization range of VG attack ***,this paper clarifies the definition of the VG attack angle in the presence of CF and reveals the CF controlling mechanism of VG on a flat *** differences in the flow phenomena around a VG both with and without CF are also *** numerical results show that a larger height or attack angle of the VG generates a greater CF suppression ***,the cross velocity increases when surmounting the primary vortex induced by the VG,except that this enhanced CF is less conspicuous for larger VG *** to the cases without CF,the VG suffers an additional loss because of the stronger separation and primary vortex loss caused by the CF.

关键词： Compressors Corner separation Cross-flow Flat plate Vortex generator

Effect of pipe material and low level disinfectants on biofilm development in a simulated drinking water distribution system

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第5期10卷 725-731页

作者： ling-ling zhou Yong-ji ZHANG Gui-bai LI School of Municipal Environmental Engineering Harbin Institute of Technology Harbin 150090 China State Key Laboratory of Pollution Control and Resources Reuse Tongji University Shanghai 200092 China

The efficiency of chlorine and chloramines disinfection on biofilm development in a simulated drinking water distribution system was investigated by using heterotrophic bacterial spread plate technique. The experiments were carried out with four annular reactors (ARs) with stainless steel (SS) or copper (Cu) material slides. The results showed that there were fewer bacteria attached to Cu slides without a disinfectant compared with those attached to SS slides. When the water was disinfected with chloramines, the heterotrophic plate counts (HPCs) on the biofilm attached to the Cu slides were significantly lower (by 3.46 log CFU/cm2) than those attached to the SS slides. Likewise, the biofilm HPC numbers on the Cu slides were slightly lower (by 1.19 log CFU/cm2) than those on the SS slides disinfected with chlorine. In a quasi-steady state, the HPC levels on Cu slides can be reduced to 3.0 log CFU/cm2 with chlorine and to about 0.9 log CFU/cm2 with chloramines. The addition of chloramines resulted in a more efficient reduction of biofilm heterotrophic bacteria than did chlorine. We concluded that the chlorine and chloramines levels usually employed in water distribution system were not sufficient to prevent the growth and development of microbial biofilm. The combination of copper pipe slides and chloramines as the disinfectant was the most efficient combination to bring about diminished bacterial levels.

关键词： Copper (Cu) Stainless steel (SS) Biofilm Heterotrophic plate counts (HPCs) Chlorine Chloramines

Multi-dimensional Central Limit Theorems and Laws of Large Numbers under Sublinear Expectations

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Acta Mathematica Sinica,English Series 2015年第2期31卷 305-318页

作者： Ze Chun HU ling zhou Department of Mathematics Nanjing University

In this paper, we present some multi-dimensional central limit theorems and laws of large numbers under sublinear expectations, which extend some previous results.

关键词： Central limit theorem law of large numbers sublinear expectation

Theoretical Study on Dihydrogen Bonds of NH3BH3 with Several Small Molecules

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Chinese Journal of Chemical Physics 2009年第1期22卷 57-62页

作者： An-yong Li Li-fang Xu zhou ling School of Chemistry and Chemical Engineering Southwest University Chongqing 400715 China

The dihydrogen bonds B-H...H-X （X= the complexes of NH3BH3 with HF, HCl, F, Cl, Br, C, O, N） in the dimer （NH3BH3）2 and HBr, H2CO, H20, and CH3OH were theoretically studied. The results show that formation of the dihydrogen bond leads to elongation and stretch frequency red shift of the BH and XH bonds, except that in the H2CO system, the CH bond blue shifts. For （NH3BH3）2 and the complexes of the halogenides, red shifts of the XH bonds are caused by the intermolecular hyperconjugation σ（BH）→σ^＊（XH）. For the system of H2CO, a blue shift of the CH bond is caused by a decrease of the intramolecular hyperconjugation n（O→σ^＊（CH）. In the other two systems, the red shift of OH bond is a secondary effect of the stronger traditional red-shifted H-bonds N-H... O. In all these systems, red shifts of the BH bonds are caused by two factors： negative repolarization and negative rehybridization of the BH bond, and decrease of occupancy on σ（BH） caused by the intermolecular hyperconjugation σ（BH）→σ^＊（XH）.

关键词： B-H...H-X dihydrogen bond Red and blue shift Negative repolarization and negative rehybridization

Gravitational Effects on Plasma Waves in Environment of Sun and Neutron Star

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Plasma Science and Technology 2014年第8期16卷 738-748页

作者：陆全康 zhou Hsiao-ling New Zealand University Maori name: Te Wananga o Aotearoa 15 Canning CrescentMangere Auckland NZ Shanghai Jiaotong University Department of Physics Fudan University Department of Physics and Astronomy Georgia State University

Local plasma phenomena in environment of Sun are observed closely by spacecrafts in recent years. We provide a new method to apply general relativity to astro-plasma physics in small local area. The relativistic dispersion relations of Langmuir, electromagnetic and cyclotron waves are obtained. The red shifts of Langmuir and cyclotron frequencies are given analytically. A new equilibrium velocity distribution of particles soaked in local gravitational field is suggested. The gravitational effect of a neutron star is also estimated.

关键词： plasma gravitational effect relativistic dispersion

Experimental and numerical investigation of two blended blade and endwall configurations

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Chinese Journal of Aeronautics 2024年第9期37卷 150-163页

作者： Tongtong MENG Xin LI ling zhou Lucheng JI Institute for Aero Engine Tsinghua UniversityBeijing 100084China Schoolof Aerospace Engineering Bejing Institute of TechnologyBeijing 0081China

The Blended Blade and Endwall(BBEW)technique has proven to be effective in control-ling the intersection of boundary layer in corner region of the compressor *** this study,the experiment and analysis of two different BBEW designs are ***,based on a linear cas-cade with 0.7 Mach number inflow,two different configurations,BBEW 1 and BBEW 2,are well ***,according to the experimental result,control effects of these two BBEW configu-rations are validated and compared subsequently under various working *** results demonstrate a reduction in total pressure loss of 12.8%and 29%at the design point for BBEW 1 and BBEW 2,***,the BBEW technique proves effective in suppressing the development of the boundary layer and preventing corner *** by detailed numerical analysis,improvements around the corner region,especially for the boundary layer,are extracted to show the mechanisms and distinctions between the two *** results indicate that BBEW 1 significantly restrains the development of boundary layer before separation occurs,while BBEW 2 directly controls the strength and scale of the corner separation.

关键词： Aerodynamic Computational fluid dynamic Experiment Corner separation Blended Blade and Endwall(BBEW)

Full blended blade and endwall design of a compressor cascade

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Chinese Journal of Aeronautics 2021年第11期34卷 79-93页

作者： Tongtong MENG Guang YANG ling zhou Lucheng JI School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Poly Technologies Inc. Beijing 100010China Institute for Aero Engine Tsinghua UniversityBeijing 100084China

In the current state-of-the-art,high-loss flow in the endwall significantly influences compressor ***,the control of endwall corner separation in compressor blade rows is important to *** on the previous research of the Blended Blade and End Wall(BBEW)technique,which can significantly reduce corner separation,in combination with a nonaxisymmetric endwall,the full-BBEW technique is proposed in this study to further reduce the separation in endwall *** principle of the unchanged axial passage area is considered to derive the geometric method for this *** models are further classified based on different geometric characteristics of this technique:the BBEW model,Inclining-Only End Wall(IOEW)model,and full-BBEW *** most effective design of each model is then found by performing several optimizations at the design point and related numerical investigations over the entire operational *** with the prototype,the total pressure loss coefficient decreases by 7%–9%in the optimized full-BBEW at the design ***,the aerodynamic blockage coefficient over the entire operational range decreases more than the other models,which shows its positive effect for *** approach has a larger decrease at negative incidence angles where the intersection of the boundary layer plays an important role in corner *** analysis shows that the blended blade profile enlarges the dihedral angle and creates a span-wise pressure gradient to move low momentum fluid towards the ***,the inclining hub geometry accelerates the accumulated flow in the corner downstream by increasing the pressure ***,though losses in the mainstream grow,especially for large incidences,the full-BBEW technique effectively reduces the separation in corners.

关键词： Aerodynamics Blended Blade and End Wall(BBEW) Corner separation Endwall profiling Flow control Turbomachinery