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基于MOVES模型的污染物排放相关性分析

太原学院学报（自然科学版） 2025年第1期43卷 47-54页

作者：杨阳刘敏太原科技大学车辆与交通工程学院山西太原030024

道路机动车排放是大气污染物的重要来源,同时也是量化评价最困难的污染源之一。目前,国内主要利用MOVES模型进行道路机动车排放预测,但在参数本地化时进行地理区域选择方面缺少深入分析,基于太原实际的道路交通流信息,共选取8个相近地... 详细信息

道路机动车排放是大气污染物的重要来源,同时也是量化评价最困难的污染源之一。目前,国内主要利用MOVES模型进行道路机动车排放预测,但在参数本地化时进行地理区域选择方面缺少深入分析,基于太原实际的道路交通流信息,共选取8个相近地理区域,模拟得出机动车CO,CH_(4),NO_(x),PM_(2.5)污染物排放量,并运用SPSS进行污染物排放量与所选地理区域纬度和海拔相关性分析。结果显示:在纬度确定的情况下,海拔和污染物排放量不存在显著相关;在海拔确定的情况下,纬度和污染物CH 4,NO_(x),PM_(2.5)排放量不存在显著相关性,但与CO排放量存在显著相关性。

关键词：机动车排放 MOVES模型 SPSS软件污染物排放相关性分析

Drag reduction methods at solid‒liquid interfaces

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Friction 2022年第4期10卷 491-515页

作者： min liu Liran MA State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Friction drag is a nonnegligible matter when relative motion happens between solid and liquid phase,which brings many inconveniences in ship navigation,fluid transportation,microfluid devices,*** various methods have been developed focusing on friction drag *** this article,a review of several widely studied drag reduction methods is given,specially,their advantages and limitations in practical applications are ***,a comparison of different methods is made and the development prospect of drag reduction is concluded.

关键词： drag reduction microstructures superhydrophobic surfaces supercavitation polymer additives

Additive Engineering for Stable and Efficient Dion-Jacobson Phase Perovskite Solar Cells

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Nano-Micro Letters 2023年第9期15卷 41-73页

作者： min liu Thierry Pauporté Institut de Recherche de Chimie Paris(IRCP) UMR8247Chimie ParisTechPSL UniversityCNRS11 Rue P.Et M.Curie75005 ParisFrance

Because of their better chemical stability and fascinating anisotropic characteristics,Dion-Jacobson(DJ)-layered halide perovskites,which owe crystallographic two-dimensional structures,have fascinated growing attention for solar ***-layered halide perovskites have special structural and photoelectronic features that allow the van der Waals gap to be eliminated or ***-layered halide perovskites have improved photophysical characteristics,resulting in improved photovoltaic ***,owing to the nature of the solution procedure and the fast crystal development of DJ perovskite thin layers,the precursor compositions and processing circumstances can cause a variety of defects to *** application of additives can impact DJ perovskite crystallization and film generation,trap passivation in the bulk and/or at the surface,interface structure,and energetic *** study discusses recent developments in additive engineering for DJ multilayer halide perovskite film *** additive-assisted bulk and interface optimization methodologies are ***,an overview of research developments in additive engineering in the production of DJ-layered halide perovskite solar cells is offered.

关键词： Dion-Jacobson phases Perovskite solar cells Additive compounds Defect passivation Stability

CQ Method for Generalized Mixed Equilibrium Problem and Fixed Point Problem of Infinite Family of Quasi--asymptotically Nonexpansive Mappings in Banach Spaces

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Acta Mathematicae Applicatae Sinica 2014年第4期30卷 931-942页

作者： min liu Department of Mathematics Yibin University

In this paper, we prove a strong convergence theorem for finding a common element of the set of solutions for a generalized mixed equilibrium problems, the set of fixed points of infinite family of quasi- C-asymptotically non-expansive mappings in a Banach space by using the CQ method. Our results improve the main results of Takahashi and Takahashi and Takahashi and Zembayashi. Moreover, the method of proof adopted in the paper is different from that of them.

关键词： quasi-C-asymptotically nonexpansive mapping generalized mixed equilibrium problem the CQmethod

Aerodynamic Noise Propagation Simulation using Immersed Boundary Method and Finite Volume Optimized Prefactored Compact Scheme

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Journal of Thermal Science 2008年第4期17卷 361-367页

作者： min liu Keqi WU Energy and Power Department Huazhong University of Science and Technology. Wuhan China 430074

Based on the immersed boundary method （IBM） and the finite volume optimized pre-factored compact （FVOPC） scheme, a numerical simulation of noise propagation inside and outside the casing of a cross flow fan is estab- lished. The unsteady linearized Euler equations are solved to directly simulate the aero-acoustic field. In order to validate the FVOPC scheme, a simulation case： one dimensional linear wave propagation problem is carried out using FVOPC scheme, DRP scheme and HOC scheme. The result of FVOPC is in good agreement with the ana- lytic solution and it is better than the results of DRP and HOC schemes, the FVOPC is less dispersion and dissi- pation than DRP and HOC schemes. Then, numerical simulation of noise propagation problems is performed. The noise field of 36 compact rotating noise sources is obtained with the rotating velocity of 1000r/min. The PML absorbing boundary condition is applied to the sound far field boundary condition for depressing the numerical reflection. Wall boundary condition is applied to the casing. The results show that there are reflections on the casing wall and sound wave interference in the field. The FVOPC with the IBM is suitable for noise propagation problems under the complex geometries for depressing the dispersion and dissipation, and also keeping the high order precision.

关键词： immersed boundary method finite volume optimized prefactored compact scheme noise

Design of efficient thermoelectric generators

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Science China Materials 2024年第1期67卷 377-378页

作者： min liu Yanzhong Pei Interdisciplinary Materials Research Center School of Materials Science and EngineeringTongji UniversityShanghai 201804China

Thermoelectricity,which enables direct conversion between heat and electricity,undergoes impressive developments in recent decades,and is particularly promising for recovering low-grade heat of<600 K[1,2].Currently,only Bi2Te3-based thermoelectric devices are commercialized[3].However,the scarcity of tellurium(Te)(Fig.1a)is the main *** leads to numerous recent efforts on the development of efficient nonBi2Te3 thermoelectrics as potential alternatives,and successful examples(Fig.1b)include Mg3Sb2-alloys[2,3]and MgAgSb[1,2].

关键词： enable efficient electricity

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Local time and Tanaka formula of G-martingales

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Applied Mathematics(A Journal of Chinese Universities) 2019年第4期34卷 468-479页

作者： liu Guo-min School of Mathematical Sciences Fudan University

The objective of this paper is to study the local time and Tanaka formula of symmetric *** introduce the local time of G-martingales and show that it belongs to the G-expectation space LG^2(ΩT).By a localization argument,we obtain the bicontinuous modification of local ***,we give the Tanaka formula for convex functions of G-martingales.

关键词： G-martingale Local time Tanaka formula

Vertex-Fault-Tolerant Cycles Embedding on Enhanced Hypercube Networks

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Acta Mathematicae Applicatae Sinica 2016年第1期32卷 187-198页

作者： min liu Hong-mei liu Faculty of Mathematics and Statistics Central China Normal University College of Science China Three Gorges University

In this paper,we focus on the vertex-fault-tolerant cycles embedding on enhanced hypercube,which is an attractive variant of hypercube and is obtained by adding some complementary edges from *** Fv be the set of faulty vertices in the n-dimensional enhanced hypercube Qn,k（1 ≤ k≤n- 1）.When ｜F_v｜ = 2,we showed that Qn,k-Fv contains a fault-free cycle of every even length from 4 to 2^n- 4 where n（n ≥ 3） and fc have the same parity;and contains a fault-free cycle of every even length from 4 to 2^n- 4,simultaneously,contains a cycle of every odd length from n — fc ＋ 2 to 2^n-3 where n（≥ 3） and fc have the different ***,when ｜Fv｜= fv ≤ n- 2,we proof that there exists the longest fault-free cycle,which is of even length 2^n- 2fv whether n（n 〉 3） and fe have the same parity or not;and there exists the longest fault-free cycle,which is of odd length 2^n-2fv- 1 in Qn,k — Fv where n（≥ 3） and fc have the different parity.

关键词： enhanced hypercube vertex-fault-tolerant embedding cycles

A Value-at-Risk Based Approach for PMU Placement in Distribution Systems

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Energy Engineering 2022年第2期119卷 781-800页

作者： min liu College of Electrical Engineering Guizhou UniversityGuiyang550025China

With the application of phasor measurement units(PMU)in the distribution system,it is expected that the performance of the distribution system state estimation can be improved obviously with the PMU measurements into *** to appropriately place the PMUs in the distribution is therefore become an important issue due to the economical *** to the concept of efficient frontier,a value-at-risk based approach is proposed to make optimal placement of PMU taking account of the uncertainty of measure errors,statistical characteristics of the pseudo measurements,and reliability of the measurement *** reasonability and feasibility of the proposed model is illustrated with 12-node system and IEEE-33 node *** results indicated that uncertainties of measurement error and instrument fault result in more PMU to be installed,and measurement uncertainty is the main affect factor unless the fault rate of PMU is quite high.

关键词： Distribution system state estimation(DSSE) efficient frontier meter placement phasor measurement units(PMU) value at risk(VaR) weighted least square(WLS)