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Journal of Thermal Science 2022年第4期31卷 1155-1166页

作者： jin lu ZHOU Leping DU Xiaoze Key Laboratory of Power Station Energy Transfer Conversion and System Ministry of Education School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China

Heat conduction of nanoconfined liquid may differ from its bulk because of the effects of size,geometry,interface,temperature,*** this study,the roles of some critical factors for the heat conduction of nanoconfined water film are systematically analyzed by using the molecular dynamics *** decreasing thickness,the normal thermal conductivity of nanoconfined water film between two copper plates decreases exponentially,while the thermal resistance,peak of the radial distribution function,and atomistic heat path increase *** average bond order,radial distribution function,mean squared displacement,and vibrational density of states are calculated to analyze the effects of structure,distribution,molecular diffusion,and vibration of water molecules on heat conduction especially in a region having no oxygen atoms(which is observed by the near-wall density profile).The results show that phonon scattering is dominant for determining the reduced thermal conductivity in this near-wall *** thermal conductivity ratio of confined water film to bulk water has a roughly linear relationship with the logarithm of the proportion of the near-wall ***,the high interfacial thermal resistance is positively correlated to the film thickness,but it has a negligible impact on heat *** work provides insights into the contribution of water molecules near the solid/liquid interface to the heat conduction of nanoconfined liquid for process intensification.

关键词： near-wall region molecular dynamics study thermal conductivity interfacial thermal resistance nanoconfined liquid

Active flutter suppression of nonlinear fin-actuator system via inverse system and immersion and invariance method

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Chinese Journal of Aeronautics 2024年第4期37卷 343-362页

作者： jin lu Zhigang WU Chao YANG Chinese Aeronautical Establishment Beijing 100029China School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China

Structural nonlinearities such as freeplay will affect the stability and even flight safety of the fin-actuator *** is a lack of a practical method for designing Active Flutter Suppression (AFS) control laws for nonlinear fin-actuator systems.A design method for the AFS controller of the nonlinear all-movable fin-electromechanical actuator system is established by combining the inverse system and the Immersion and Invariance (I&I) ***,the composite control law combining the inverse system principle and internal model control is used to offset the nonlinearity and dynamics of the actuator,so that its driving torque can follow the ideal ***,the ideal torque of the actuator is designed employing the I&I *** unfavorable oscillation of the fin is suppressed by making the output torque of the actuator track the ideal *** simulation results reveal that the proposed AFS method can increase the flutter speed of the nonlinear finactuator system with freeplay,and a set of controller parameters is also applicable for wider freeplay within a certain *** power required for the actuator does not exceed the power that can be provided by the commonly used aviation *** method can also resist a certain level of noise and external disturbance.

关键词： Aeroelasticity Active flutter suppression Fin-actuator system Freeplay Inverse system Immersion and invariance

On the Martensitic Transformation Temperatures and Mechanical Properties of NiTi Alloy Manufactured by Selective Laser Melting: Effect of Remelting

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Acta Metallurgica Sinica(English Letters) 2021年第9期34卷 1223-1233页

作者： Jian-Bin Zhan Yan-jin lu jin-Xin Lin College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

In this study, the infl uence of laser remelting on the relative density, martensitic transformation temperatures(MTTs), and mechanical properties of a NiTi alloy fabricated by selective laser melting(SLM) at a laser power between 15 and 75 W were investigated. A relative alloy density of approximately 99% was achieved in the power range of 45–60 W corresponding to the forming energy density range of 65.45–87.27 J/mm3. The MTTs increased with the increase in the energy density;thus, the initial contents of the B2 and B19′ phases of the SLM-produced NiTi alloy can be tailored by the utilized technique. However, the number of defects such as metallurgical pores and microcracks considerably increased at higher energy densities(> 87.27 J/mm3). Interestingly, the concentration of these defects was reduced by remelting in the energy density range of 21.82–65.45 J/mm3, while the alloy relative density increased to 99.7% ± 0.1% at a remelting energy density of 65.45 J/mm3. The results of tensile testing revealed that when the remelting energy was 75% or 100% of the forming energy input, the ultimate tensile strength and elongation of the alloy significantly increased. Therefore, the remelting strategy represents a promising route for manufacturing NiTi alloys with desired MTT ranges and mechanical properties.

关键词： Selective laser melting NiTi alloy Laser remelting Martensitic transformation temperature

Characterization of a Novel Annexin Gene from Cotton (Gossypium hirsutum cv CRI 35) and Antioxidative Role of its Recombinant Protein

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Journal of Integrative Plant Biology 2011年第5期53卷 347-357页

作者： lu Zhou jin Duan Laboratory of Molecular Biology and MOE Laboratory of Protein Science School of Life Sciences Tsinghua University Beijing 100084China

Plant annexins represent a multigene family involved in cellular elongation and development. A cDNA encoding a novel annexin was isolated from a cotton （Gossypium hirsutum） fiber cDNA library and designated GhAnxl. This gene encodes a 316 amino acid protein with a theoretical molecular mass of 36.06 kDa and a theoretical pl of 6.19. At the amino acid level, it shares high sequence similarity and has evolutionary relationships with annexins from higher plants. The purified recombinant protein expressed in Escherichia coil was used to investigate its physicochemical properties. Circular dichroism spectrum analyses showed a positive peak rising to the maximum at 196 nm and a broad negative band rounding 215 nm, suggesting that the GhAnxl protein was prominently α-helical. The fluorescence measurements indicated that it could bind to Ca2 in vitro. These results demonstrated that GhAnxl was a typical annexin protein in cotton. A bioassay experiment was conducted to analyze its potential function and showed that E. coil cells expressing GhAnxl were protected from tert-butyl hydroperoxide （tBH） stress, suggesting that it had a potential antioxidative role. Northern blot analyses revealed that GhAnxl was highly expressed in fibers, especially during the elongation stage, suggesting that it might be important for fiber elongation.

关键词： Amino acids Fibres Plants Planting Cotton Gossypium Lymphocytes Measurement Acids Acidity

A Uniqueness Theorem of Meromorphic Maps and a Generalization of the Borel’s Lemma

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Acta Mathematica Sinica,English Series 2019年第9期35卷 1464-1480页

作者： Kai ZHOU lu jin School of Mathematical Sciences Fudan University

This paper gives a generalization of the classical Borel’s Lemma. Then as an application of this generalized Borel’s Lemma, a uniqueness theorem for two linearly non-degenerate meromorphic maps of Cm into P^n(C)(n ... 详细信息

关键词： Uniqueness theorem meromorphic map Borel’s Lemma hyperplane

The Connection Between the Metric and Generalized Projection Operators in Banach Spaces

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Acta Mathematica Sinica,English Series 2007年第6期23卷 1109-1120页

作者： Yakov ALBER jin lu LI Department of Mathematics Technion Israel Institute of Technology 32000 Haifa Israel Department of Mathematical Sciences Shawnee State University Portsmouth Ohio 45662 USA

In this paper we study the connection between the metric projection operator PK ： B →K, where B is a reflexive Banach space with dual space B^＊ and K is a non-empty closed convex subset of B, and the generalized projection operators ∏K ： B → K and πK ： B^＊ → K. We also present some results in non-reflexive Banach spaces.

关键词： Banach spaces normalized duality mappings metric and generalized projection operators,variational inequalities minimization problems closed and convex subsets and cones

Progression of injectivity damage with oily waste water in linear flow

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Petroleum Science 2014年第4期11卷 550-562页

作者： jin lu Wojtanowicz Andrew K InPetro Technologies Inc. 9800 Centre Parkway#860HoustonTX 77036USA Craft & Hawkins Department of Petroleum Engineering Louisiana State UniversityPatrick F.Taylor HallRoom 2160BBaton RougeLA 70803USA

Numerous laboratory experiments and field cases show that even very small amount of oil in injected water can cause severe injectivity damage. Although injectivity decline caused by oil droplets has been studied experimentally, there is still lack of an easy-to-use and widely accepted model to predict the decline behavior. In this work, we developed an analytical model to predict the time-dependent progress of the water permeability reduction in linear flow by analyzing experimental data obtained from linear core flooding. The model considers mass transfer of the oil phase from the produced water to the rock due capture effects by dispersion, advection and adsorption inside the rock. As the captured oil saturation increases, permeability reduces following the relative permeability drainage relationship. The reduction stabilizes when the oil saturation comes to an equilibrium value controlled by oil droplet size and injection velocity. The model is calibrated using published experimental data from prolonged core floods with oil- contaminated waste water. Theoretical runs of the model replicate all the effects known from experimental observations. Resulting from the model is a distributed change of permeability vs. time and distance from the point of injection that can be converted to the overall injectivity damage.

关键词： Produced water injection injectivity decline permeability damage linear flow model,filtration model

Dempster-Shafer Evidence Theory and Study of Some Key Problems

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Journal of Electronic Science and Technology 2017年第1期15卷 106-112页

作者： Ying-jin lu Jun He School of Management and Economics University of Electronic Science and Technology of ChinaChengdu 610054China

As one of the most important mathematical methods, the Dempster-Shafer（D-S）evidence theory has been widely used in date fusion, risk assessment, target identification, knowledge reasoning,and other fields. This paper summarized the development and recent studies of the explanations of D-S model, evidence combination algorithms, and the improvement of the conflict during evidence combination, and also compared all explanation models,algorithms, improvements, and their applicable conditions. We are trying to provide a reference for future research and applications through this summarization.

关键词： Bayesian reasoning belief uncertainty intuitive summarized explanation decoder applicable likelihood

Optimal synthesis of heat-integrated distillation configurations using the two-column superstructure

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Chinese Journal of Chemical Engineering 2024年第2期66卷 238-249页

作者： Xiaodong Zhang lu jin jinsheng Sun School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China

In the realm of the synthesis of heat-integrated distillation configurations,the conventional approach for exploring more heat integration possibilities typically entails the splitting of a single column into a twocolumn ***,this approach frequently necessitates tedious enumeration procedures,resulting in a considerable computational *** surmount this formidable challenge,the present study introduces an innovative remedy:The proposition of a superstructure that encompasses both single-column and multiple two-column ***,a simultaneous optimization algorithm is applied to optimize both the process parameters and heat integration structures of the twocolumn *** effectiveness of this approach is demonstrated through a case study focusing on industrial organosilicon *** results underscore that the superstructure methodology not only substantially mitigates computational time compared to exhaustive enumeration but also furnishes solutions that exhibit comparable performance.

关键词： Superstructure Process synthesis Heat integration Simulation-based optimization Industrial organosilicon separation

Corrosion inhibition of a hygroscopic inorganic dust-depressor

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Journal of University of Science and Technology Beijing 2006年第4期13卷 368-371页

作者： Longzhe jin lu Wang Dongke Chen Civil and Environmental Engineering School University of Science and Technology Beijing Beijing 100083 China

Metallic corrosion is a serious problem in the application of a hygroscopic inorganic dust-depressor. The basic characteristics of a hygroscopic inorganic dust-depressor and its corrosivity, corrosion mechanism, as well as the principle of corrosion inhibition were analyzed. The static mass-loss test was carried out to investigate the corrosion behavior and the effect of the dust-depressor. The static corrosion rates of steel specimens were measured in six different corrosion inhibitor solutions of the dust-depressor, and the suitable corrosion inhibitors for the dust-depressor to reduce the corrosivity were found out.

关键词： corrosion corrosion inhibitor dust-depressor corrosion resistance static mass-loss test