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Nano Research 2023年第11期16卷 12830-12839页

作者： Baoshan liu Boan Zhong Feng Li Jing liu Liping Zhao Peng Zhang Lian Gao School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Heterostructures are often constructed to modulate the electronic states of the two catalysts,achieving high-performance in alkaline hydrogen evolution reaction(HER).Various mechanisms have been proposed for the heterostructural catalysts,which however awaits further ***,a heterostructure composed of Co_(2)P and CoP was successfully prepared with significantly enhanced HER catalytic activity relative to the *** ultraviolet photoelectron spectroscopy(UPS)and Xray photoelectron spectroscopy(XPS)revealed the effective promotion of the self-driven transferring of electrons from CoP to Co_(2)P and the accumulation of electrons on the P sites in Co_(2)P due to the strong electronic coupling of built-in electric field in the Co_(2)P/CoP *** situ electrochemical impedance spectroscopy(EIS)and poison experiments confirmed the Heyrovsky step of H*intermediate depleting on electronegative P sites and contributions of both metal and P to the reactivity in the Co_(2)P/*** functional theory(DFT)calculations clarify that the electronic structure at interface of the heterojunction significantly weakens the hydrogen adsorption free energy(ΔGH*ads)of P site in Co_(2)P/CoP to near *** also propose an electronic redistribution strategy for heterostructures that activates the multiple routes mechanism and production of more active *** working mechanism is expected to be further extended to other transition metal compounds for efficient HER activity.

关键词： heterostructure electronic structure active site intermediate depleting density functional theory

Identification of charging behavior characteristic for large-scale heterogeneous electric vehicle fleet

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Journal of Modern Power Systems and Clean Energy 2018年第3期6卷 567-581页

作者： Peng liu Jilai YU Department of Electrical Engineering Harbin Institute of Technology

This paper aims to accurately identify parameters of the natural charging behavior characteristic(NCBC)for plug-in electric vehicles(PEVs) without measuring any data regarding charging request information of PEVs. To this end, a data-mining method is first proposed to extract the data of natural aggregated charging load(ACL) from the big data of aggregated residential load. Then, a theoretical model of ACL is derived based on the linear convolution theory. The NCBC-parameters are identified by using the mined ACL data and theoretical ACL model via the derived identification model. The proposed methodology is cost-effective and will not expose the privacy of PEVs as it does not need to install sub-metering systems to gather charging request information of each PEV. It is promising in designing unidirectional smart charging schemes which are attractive to power utilities. Case studies verify the feasibility and effectiveness of the proposed methodology.

关键词： Plug-in electric vehicle Natural charging behavior characteristic Data-mining Aggregated charging load Theoretical model Parameter identification Heterogeneous

Applications of Wavelet Analysis in Differential Propagation Phase Shift Data De-noising

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Advances in Atmospheric Sciences 2014年第4期31卷 825-835页

作者： HU Zhiqun liu Liping State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences

Using numerical simulation data of the forward differential propagation shift （ΦDP） of polarimetric radar,the principle and performing steps of noise reduction by wavelet analysis are introduced in *** from the multiscale analysis,various types of noises can be identified according to their characteristics in different scales,and suppressed in different resolutions by a penalty threshold strategy through which a fixed threshold value is applied,a default threshold strategy through which the threshold value is determined by the noise intensity,or a ΦDP penalty threshold strategy through which a special value is designed for ΦDP ***,a hard-or soft-threshold function,depending on the de-noising purpose,is selected to reconstruct the *** the three noise suppression strategies and the two signal reconstruction functions,and without loss of generality,two schemes are presented to verify the de-noising effect by dbN wavelets：（1） the penalty threshold strategy with the soft threshold function scheme （PSS）; （2） the ΦDP penalty threshold strategy with the soft threshold function scheme （PPSS）.Furthermore,the wavelet de-noising is compared with the mean,median,Kalman,and finite impulse response （FIR） methods with simulation data and two actual *** results suggest that both of the two schemes perform well,especially when ΦDP data are simultaneously polluted by various scales and types of noises.A slight difference is that the PSS method can retain more detail,and the PPSS can smooth the signal more successfully.

关键词： polarimetric radar wavelet analysis differential propagation phase shift de-noising

Simulation of the growth ring density of Larix olgensis plantation wood with the ARMA model

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Journal of Forestry Research 2019年第2期30卷 727-737页

作者： Yi liu Minghui Guo Material Science and Engineering College Northeast Forestry University

Because growth ring data have temporal features, time series analysis can be used to simulate and reveal changes in the life of a tree and contribute to plantation management. In this study, the autoregressive(AR) and moving average modeling method was used to simulate the time series for growth ring density in a larch plantation with different initial planting densities. We adopted the Box–Jenkins method for the modeling, which was initially based on an intuitive analysis of sequence graphs followed by the augmented Dickey–Fuller stationarity test. The order p and q of the ARMA(p, q) model was determined based on the autocorrelation and partial correlation coefficient figure truncated on the respective *** the residual judgment, the model AR(2) was only fitted to the larch growth ring density series for the plantation with the 1.5 9 2.0 m^2 initial planting *** the residuals series for the other three series was not shown as a white noise sequence, the modeling was rerun. Larch wood from the initial planting density of2.0 9 2.0 m^2 was modeled by ARMA(2, 1), and ARMA((1, 5), 3) fitted to the 2.5 9 2.5 m^2 initial planting density,and the 3.0 9 3.0 m^2 was modeled by AR(1, 2, 5).Although the ARMA modeling can simulate the change in growth ring density, data for the different growth ring time series were described by different models. Thus, time series modeling can be suitable for growth ring data analysis, revealing the time domain and frequency domain of growth ring data.

关键词： Growth ring density Larix olgensis plantation wood ARMA Modeling Time series analysis

Research Progress of Catalysts and Initiators for Promoting the Cracking of Endothermic Hydrocarbon Fuels

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Transactions of Tianjin University 2022年第3期28卷 199-213页

作者： Yiyao liu Ran Chen Jie liu Xiangwen Zhang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Academic Journal Publishing Center of Tianjin University Tianjin 300072China Key Laboratory for Advanced Fuel and Chemical Propellant of Ministry of Education Tianjin 300072China

Catalytic/initiated cracking of endothermic hydrocarbon fuels is an eff ective technology for cooling a hypersonic aircraft with a high Mach number(over 5).Catalysts and initiators can promote fuel cracking at low temperatures,increase fuel conversion and the heat sink capacity,and suppress coke deposition,thereby reducing waste *** mainly include metal oxide catalysts,noble metal catalysts and metal nanoparticles,zeolite catalysts,nanozeolite catalysts,and coating ***,initiators roughly include nitrogenous compounds,oxygenated compounds,and hyperbranched polymer *** this review,we aim to summarize the catalysts and initiators for cracking endothermic hydrocarbon fuels and their mechanisms for promoting *** review will facilitate the development of the synthesis and exploration of catalysts and initiators.

关键词： Endothermic hydrocarbon fuels Cracking Catalysts Initiators

Chemoimmunotherapy in advanced esophageal squamous cell carcinoma:optimizing chemotherapy regimens for immunotherapy combinations

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Signal Transduction and Targeted Therapy 2022年第8期7卷 2646-2647页

作者： Zhichao liu Jun liu Zhigang Li Department of Thoracic Surgery Shanghai Chest HospitalShanghai Jiao Tong University School of MedicineShanghaiChina Esophageal Diseases Center Shanghai Jiao Tong UniversityShanghaiChina Department of Radiation Oncology Shanghai Chest HospitalShanghai Jiao Tong University School of MedicineShanghaiChina

A recent study published in BMJ by Lu et al.1 has reported the interim findings from the ORIENT-15,which is a global,multi-center and randomized phase 3 trial to compare chemoimmunotherapy to chemotherapy alone as first-line treatment in advanced esophageal squamous cell carcinoma(ESCC),and provoked thinking about the chemotherapy regimens for chemoimmunotherapy combinations.

关键词： immunotherapy esophageal regimen

Self-assembly behavior of inclusion complex formed by β-cyclodextrin withα-aminopyridine

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Science China Chemistry 2004年第3期47卷 200-205页

作者： ZHAO Yanli liu Yu Department of Chemistry State Key Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 300071 China Department of Chemistry State Key Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 300071 China

An inclusion complex (1) has been prepared by β-cyclodextrin with α-aminopyridine. The result of X-ray crystallographic analyses showed that the α-aminopyridine molecules in the β-cyclodextrin cavities possess two opposite orientations, i.e. the amine group of α-aminopyridine pointing to the primary side (1a, occupancy: 41.2%) or the secondary side (1b, occupancy: 58.8%) of β-cyclodextrin, forming two scalelike supramolecular aggregations. The studies of 2D NMR and circular dichroism spectra indicated that the α-aminopyridine molecule is deeply embedded in the β-cyclodextrin cavity to form host-guest inclusion complex, showing a circular dichroism spectrum induced by the chiral cavity of cyclodextrin. The results obtained are helpful for understanding the molecular recognition and aggregation mechanism between the host and guest.

关键词： aggregation, crystal structure, cyclodextrin, hydrogen bonds, inclusion complex.

The Development of a Renewable-Energy-Driven Reverse Osmosis System for Water Desalination and Aquaculture Production

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Journal of Integrative Agriculture 2013年第8期12卷 1357-1362页

作者： Clark C K liu Department of Civil and Environmental Engineering and Water Resources Research CenterUniversity of Hawaii at Manoa

Water and energy are closely linked natural resources - the transportation, treatment, and distribution of water depends on low-cost energy; while power generation requires large volumes of water. Seawater desalination is a mature technology for increasing freshwater supply, but it is essentially a trade of energy for freshwater and is not a viable solution for regions where both water and energy are in short supply. This paper discusses the development and application of a renewable-energy-driven reverse osmosis （RO） system for water desalination and the treatment and reuse of aquaculture wastewater. The system consists of （1） a wind-driven pumping subsystem, （2） a pressure-driven RO membrane desalination subsystem, and （3） a solar-driven feedback control module. The results of the pilot experiments indicated that the system, operated under wind speeds of 3 m s-~ or higher, can be used for brackish water desalination by reducing the salinity of feedwater with total dissolved solids （TDS） of over 3 000 mg L-1 to product water or permeate with a TDS of 200 mg L-~ or less. Results of the pilot experiments also indicated that the system can remove up to 97% of the nitrogenous wastes from the fish pond effluent and can recover and reuse up to 56% of the freshwater supply for fish pond operation.

关键词： renewable energy desalination pressure-driven membrane processes aquaculture fish pond

μ-Synthesis control with reference model for aeropropulsion system test facility under dynamic coupling and uncertainty

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Chinese Journal of Aeronautics 2023年第10期36卷 246-261页

作者： Jiashuai liu Xi WANG Xi liu Meiyin ZHU Xitong PEI Song ZHANG Zhihong DAN School of Energy and Power Engineering Beihang UniversityBeijing 100191China Zhongfa Aviation Institute Beihang UniversityHangzhou 311115China Research Institute of Aero-Engine Beihang UniversityBeijing 100191China Science and Technology on Altitude Simulation Laboratory AECC(Aero Engine Corporation of China)Sichuan Gas Turbine EstablishmentMianyang 621703China

Due to the dynamic coupling and multi-source uncertainties,it is difficult to accurately control the pressure and temperature of the Aeropropulsion System Test Facility(ASTF)in the presence of rapid command and large *** paper presents the design ofμ-synthesis control to solve the *** incorporating the pressure ratio into the linear equation of the control valve,the modeling error of ASTF in the low frequency range is effectively ***,an uncertain model is established by considering various factors,including parameter variations,modeling error in the low frequency range,unmodeled dynamics,and changes in the working *** address the dynamic coupling,a diagonal reference model with desired performance is incorporated intoμ-***,all weighting functions are designed according to the performance ***,theμ-controller is obtained by using the standardμ-synthesis *** results indicate that theμ-controller decouples the pressure and temperature dynamics of *** with the multivariable PI controller,integral-μcontroller,and double integral-μcontroller,the proposedμ-controller can achieve higher transient accuracy and better disturbance ***,the robustness of theμ-controller is demonstrated by Monte Carlo simulations.

关键词： Aeropropulsion System Test Facility(ASTF) Decoupling Robustness μ-Synthesis Uncertainty

Incombustible solid polymer electrolytes:A critical review and perspective

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Journal of Energy Chemistry 2024年第6期93卷 264-281,I0007页

作者： Kai Wu Jin Tan Zhenfang liu Chenguang Bao Ao Li Qi liu Baohua Li College of Materials Science and Engineering Hunan UniversityChangsha 413000HunanChina Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 055GuangdongChina

Since the advent of the solid-state batteries,employing solid polymer electrolytes(SPEs)to replace routine flammable liquid electrolytes is regarded to be one of the most promising solutions in pursing highenergy-density battery *** with superior thermal stability,good processability,and high mechanical modulus obtain increasing ***,SPE-based batteries are not impenetrable due to their decomposition and combustibility under extreme *** believe incorporating appropriate flame-retardant additives/solvents/fragments into SPEs can intrinsically reduce their flammability to solve the battery safety *** this review,the recent research progress of incombustible SPEs,with special emphasis on flame-retardant structural design,is ***,a brief introduction of flame-retardant mechanism,evaluation index for safety of SPEs,and a detailed overview of the latest advances on diverse-types SPEs in various battery systems are *** deep insight into thermal ru naway process,the free-standing incombustible GPEs,and the ratio nal design of pouch cell structures may be the main directions to motivate revolutionary next-generation for safety batteries.

关键词： Non-flammable electrolyte Solid polymer electrolyte High safety electrolyte Solid state electrolyte Solid state battery