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基于S-R和分解定理的二维几何非线性问题的虚单元法求解
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作者 江巍 尹豪 +3 位作者 吴剑 汤艳春 李坤鹏 郑宏 《工程力学》 EI CSCD 北大核心 2024年第8期23-35,共13页
应变-旋转(Strain-Rotation,S-R)和分解定理为分析几何非线性问题提供了合理可靠的理论基础,但用有限元求解时会遇到大变形发生后的网格畸变问题。近年提出的虚单元法(Virtual element method,VEM)适用于一般的多边形网格,因此,该文尝... 应变-旋转(Strain-Rotation,S-R)和分解定理为分析几何非线性问题提供了合理可靠的理论基础,但用有限元求解时会遇到大变形发生后的网格畸变问题。近年提出的虚单元法(Virtual element method,VEM)适用于一般的多边形网格,因此,该文尝试使用一阶虚单元求解基于S-R和分解定理的二维几何非线性问题,以克服网格畸变的影响。基于重新定义的多项式位移空间基函数,推演获得一阶虚单元分析线弹性力学问题时允许位移空间向多项式位移空间的投影表达式;按照虚单元法双线性格式的计算规则,分析处理基于更新拖带坐标法和势能率原理的增量变分方程;进而建立离散系统方程及其矩阵表达形式,并编制MATLAB求解程序;采用常规多边形网格和畸变网格,应用该文算法分析均布荷载下的悬臂梁和均匀内压下的厚壁圆筒变形。结果与已有文献和ANSYS软件的对比表明:该文算法在两种网格中均可有效执行且具备足够数值精度。总体该文算法为基于S-R和分解定理的二维几何非线性问题求解提供了一种鲁棒方法。 展开更多
关键词 S-r和分解定理 虚单元法 几何非线性 网格畸变 多边形网格
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Fractal Method for Statistical Analysis Geological Data 被引量:2
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作者 Meng Xianguo Zhao PengdaChina University of Geosciences , Wuhan 430074 《Journal of Earth Science》 SCIE CAS CSCD 1991年第1期114-119,共6页
This paper establishes the phase space in the light of spacial series data , discusses the fractal structure of geological data in terms of correlated functions and studies the chaos of these data . In addition , it i... This paper establishes the phase space in the light of spacial series data , discusses the fractal structure of geological data in terms of correlated functions and studies the chaos of these data . In addition , it introduces the R/S analysis for time series analysis into spacial series to calculate the structural fractal dimensions of ranges and standard deviation for spacial series data -and to establish the fractal dimension matrix and the procedures in plotting the fractal dimension anomaly diagram with vector distances of fractal dimension . At last , it has examples of its application . 展开更多
关键词 geological data fractal method fractal dimension space series r/S analysis .
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Research on nonlinear R/S method and its application in earthquake prediction 被引量:1
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作者 王碧泉 黄汉明 +2 位作者 范洪顺 王春珍 陈佩燕 《Acta Seismologica Sinica(English Edition)》 CSCD 1995年第4期653-658,共6页
ResearchonnonlinearR/SmethodanditspplicationinearthquakepredictionBi-QuanWANG(王碧泉);Han-MingHUANG(黄汉明);Hong-S... ResearchonnonlinearR/SmethodanditspplicationinearthquakepredictionBi-QuanWANG(王碧泉);Han-MingHUANG(黄汉明);Hong-ShunFAN(范洪顺);Chuen... 展开更多
关键词 nonlinear theory fractal dimension earthquake prediction r/S method
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Reduced Differential Transform Method for Solving Nonlinear Biomathematics Models 被引量:4
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作者 K.A.Gepreel A.M.S.Mahdy +1 位作者 M.S.Mohamed A.Al-Amiri 《Computers, Materials & Continua》 SCIE EI 2019年第9期979-994,共16页
In this paper,we study the approximate solutions for some of nonlinear Biomathematics models via the e-epidemic SI1I2R model characterizing the spread of viruses in a computer network and SIR childhood disease model.T... In this paper,we study the approximate solutions for some of nonlinear Biomathematics models via the e-epidemic SI1I2R model characterizing the spread of viruses in a computer network and SIR childhood disease model.The reduced differential transforms method(RDTM)is one of the interesting methods for finding the approximate solutions for nonlinear problems.We apply the RDTM to discuss the analytic approximate solutions to the SI1I2R model for the spread of virus HCV-subtype and SIR childhood disease model.We discuss the numerical results at some special values of parameters in the approximate solutions.We use the computer software package such as Mathematical to find more iteration when calculating the approximate solutions.Graphical results and discussed quantitatively are presented to illustrate behavior of the obtained approximate solutions. 展开更多
关键词 reduced differential transforms method nonlinear biomathematics models SI1I2r model SIr model analytic approximate solutions qualitative analysis stability and equilibrium.
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Preparation of Layered Potassium Titanate Whiskers with Large Length-diameter Ratio by KDC Method 被引量:4
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作者 吉晓莉 WU Shijiang +1 位作者 章嵩 ZHAO Xiujian 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第4期669-673,共5页
Pure K2Ti4O9 whiskers were prepared by KDC(Kneading-Drying-Calcination) method with TiO2 and K2CO3 as raw materials. The influences of TiO2/K2CO3 molar ratio(RT/K), calcination temperature(TC) and cooling proces... Pure K2Ti4O9 whiskers were prepared by KDC(Kneading-Drying-Calcination) method with TiO2 and K2CO3 as raw materials. The influences of TiO2/K2CO3 molar ratio(RT/K), calcination temperature(TC) and cooling process on phase composition and morphology of the whiskers were investigated by TG-DSC(thermo gravimetric-differential scanning calorimeter), XRD(X-ray diffraction), and SEM(scanning electron microscope). Pure K2Ti4O9 potassium titanate whiskers with large length-diameter ratio(r)(over 250) can be obtained at RT/K = 2.9 and TC = 950 ℃. 展开更多
关键词 KDC(kneading-drying-calcination) method potassium titanate whiskers TiO2/K2CO3 molar ratio(rT/K) length-diameter ratio(r
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On the Method of Multiplier-enlargement and Approximation of Unbounded Continuous Functions 被引量:1
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作者 郑成德 王仁宏 《Northeastern Mathematical Journal》 CSCD 2001年第2期231-235,共5页
By combining the classical appropriate functions “1, x, x 2” with the method of multiplier enlargement, this paper establishes a theorem to approximate any unbounded continuous functions with modified positive... By combining the classical appropriate functions “1, x, x 2” with the method of multiplier enlargement, this paper establishes a theorem to approximate any unbounded continuous functions with modified positive linear operators. As an example, Hermite Fejér interpolation polynomial operators are analysed and studied, and a general conclusion is obtained. 展开更多
关键词 positive linear operator approximation of unbounded continuous function method of multiplier enlargement Hermite Fejér interpolation polynomial operator
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Numerical stability of solution to delay differential equations under resolvent condition for Runge-Kutta methods
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作者 赵景军 刘明珠 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2001年第2期135-139,共5页
Deals with the application of Kreiss resolvent condition in the error growth analysis of numerical methods, and studies the stability of Runge Kutta method in respect of Kreiss resolvent condition with emphasis on the... Deals with the application of Kreiss resolvent condition in the error growth analysis of numerical methods, and studies the stability of Runge Kutta method in respect of Kreiss resolvent condition with emphasis on the study on the subclass of collocation methods with abscissas in [0,1] by applying the methods to the test equation U′(t)=λU(t)+μU(t-τ)τ>0 with complex constraints μ and λ, and proves under some assumptions on the R K methods that the error growth is uniformly bounded in the stability region. 展开更多
关键词 Delay differential equations STABILITY Kreiss resolvent r K methods
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R/S method for evaluation of pollutant time series in environmental quality assessment
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作者 Bu Quanmin Bi Jun +1 位作者 Yuan Zengwei Huang Lei 《Water Science and Engineering》 EI CAS 2008年第4期82-88,共7页
The significance of the fluctuation and randomness of the time series of each pollutant in environmental quality assessment is described for the first time in this paper. A comparative study was made of three differen... The significance of the fluctuation and randomness of the time series of each pollutant in environmental quality assessment is described for the first time in this paper. A comparative study was made of three different computing methods: the same starting point method, the striding averaging method, and the stagger phase averaging method. All of them can be used to calculate the Hurst index, which quantifies fluctuation and randomness. This study used real water quality data from Shazhu monitoring station on Taihu Lake in Wuxi, Jiangsu Province. The results show that, of the three methods, the stagger phase averaging method is best for calculating the Hurst index of a pollutant time series from the perspective of statistical regularity. 展开更多
关键词 environmental quality assessment time series fractal dimension r/S statistical method Hurst index
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Projected Runge-Kutta methods for constrained Hamiltonian systems 被引量:4
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作者 Yi WEI Zichen DENG +1 位作者 Qingjun LI Bo WANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2016年第8期1077-1094,共18页
Projected Runge-Kutta (R-K) methods for constrained Hamiltonian systems are proposed. Dynamic equations of the systems, which are index-3 differential-algebraic equations (DAEs) in the Heisenberg form, are establi... Projected Runge-Kutta (R-K) methods for constrained Hamiltonian systems are proposed. Dynamic equations of the systems, which are index-3 differential-algebraic equations (DAEs) in the Heisenberg form, are established under the framework of Lagrangian multipliers. R-K methods combined with the technique of projections are then used to solve the DAEs. The basic idea of projections is to eliminate the constraint violations at the position, velocity, and acceleration levels, and to preserve the total energy of constrained Hamiltonian systems by correcting variables of the position, velocity, acceleration, and energy. Numerical results confirm the validity and show the high precision of the proposed method in preserving three levels of constraints and total energy compared with results reported in the literature. 展开更多
关键词 projected runge-Kutta r-K) method differential-algebraic equation(DAE) constrained Hamiltonian system energy and constraint preservation constraint violation
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PVTxSTUDYOFBINARYSYSTEMR22/R152aWITHBURNETTMETHOD
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作者 Su Zhijun Jiang Baocheng Yan Jialu (Shanghai Jiaotong University) (Harbin Institute of Technology) Zhu Mingshan Han Lizhong Fu Yidong (Tsinghua University) 《Journal of Shanghai Jiaotong university(Science)》 EI 1996年第1期7-11,共5页
This paper reports the PVT x properties of R22/R152a system in the ranges of temperature from 298.15K to 353.15K and pressure from 0.288 MPa to 1.288 MPa. Sixty seven PVT x measurements for three compositions, i... This paper reports the PVT x properties of R22/R152a system in the ranges of temperature from 298.15K to 353.15K and pressure from 0.288 MPa to 1.288 MPa. Sixty seven PVT x measurements for three compositions, i.e., 0.2712, 0.4094 and 0.7911 mole fraction of R22, have been measured along 16 isotherms. The uncertainties of temperature and pressure measurements are less than ±0.01K and ±500 Pa respectively. The reliability of the experimental measurements is confirmed by the CSD equation. 展开更多
关键词 PVT x properties r22/r152a BINArY system Burnett method rEFrIGErANT alternatives
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Estimating GARCH Modeling Using Metropolis-Hastings Method in R
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作者 Min Wang Yunshun Wu 《Open Journal of Statistics》 2018年第6期931-938,共8页
This paper mainly talks about a popular approach of volatility of a GARCH-type model in R, while the disturbances are independent and have identical Student-t distribution. It uses the Metropolis-Hastings method to pe... This paper mainly talks about a popular approach of volatility of a GARCH-type model in R, while the disturbances are independent and have identical Student-t distribution. It uses the Metropolis-Hastings method to perform the computations and gives the programs in details in R. 展开更多
关键词 Student’s t Distribution DEGrEE of FrEEDOM GArCH t Model r METrOPOLIS-HASTINGS method
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P25 Scoring Method for the Assessment of R/C Buildings
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作者 Kubilay Kaptan 《Journal of Civil Engineering and Architecture》 2012年第7期834-843,共10页
An effective rapid assessment technique, called "P25 Scoring Method", has been developed and tested on 26 different case studies recently, in order to predict the collapse vulnerability of the R/C buildings. After a... An effective rapid assessment technique, called "P25 Scoring Method", has been developed and tested on 26 different case studies recently, in order to predict the collapse vulnerability of the R/C buildings. After a short description of the approach, the study presents the sensitivity study of the method to the selected structural parameters by considering incremental deviation of the final scores from the base model. Further, the methodology was applied to an additional 100 damaged buildings in order to check the reliability of the method and some necessary modifications have been applied to the algorithm after considering this larger database. The evaluation of the results has been interpreted as a beneficial guidance for local authorities. The risk bands are defined according to the final scores and the effect of changing the band-width has also been studied through a safe but an economical procedure. A satisfactory correlation of the method with real damage states is obtained and a ready-to-use methodology has been introduced for future studies. 展开更多
关键词 rapid assessment technique P25 scoring method r/C Buildings.
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A Statistical Method for Determining the Fractal Dimension of Time Series
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作者 Xinmeng Wang Junjie Bai +1 位作者 Haiyue Jin Yicheng Hong 《数学计算(中英文版)》 2017年第1期1-4,共4页
In this paper,we present a new method for determining the fractal dimension of time series and the algorithm of H index(Hurst index).
关键词 TIME SErIES FrACTAL DIMENSION H INDEX r/S Analysis method
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Electron impact excitation of Ni-like gold studied by Dirac R-matrix method
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作者 范全平 汪文慧 +4 位作者 胡峰 曹磊峰 张强强 刘钰薇 蒋刚 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第11期261-267,共7页
We calculate the electron impact excitation of Ni-like gold by using the Dirac R-matrix theory, and the cor- responding collision strengths and effective collision strengths are obtained. In the calculations of the le... We calculate the electron impact excitation of Ni-like gold by using the Dirac R-matrix theory, and the cor- responding collision strengths and effective collision strengths are obtained. In the calculations of the level energy, (1sZ2sZ2p6)3sZ3p63d10, 3s23p63d94/, 3s23p53d104/, and 3s3p63d104/(l = 0, 1,2,3) configurations are included and 107 fine-structure levels are generated. In the calculations of the collision strengths, only the first 59 levels are included. Com- parisons are made with the distorted wave (DW) results of Zeng et al. for both collision strengths and effective collision strengths. For the collision strengths, the two sets of calculations are in excellent agreement for most of the transitions. However, because of the inclusion of the resonances, our effective collision strengths are generally several times larger than those of Zeng et al.. The accuracy of our calculations is assessed. 展开更多
关键词 electron impact excitation r-matrix method Ni-like gold
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Optimization Design of McPherson Suspension Steering System Based on R-W Method
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作者 卞学良 马国清 王志强 《Defence Technology(防务技术)》 SCIE EI CAS 2010年第2期144-149,共6页
The kinematical equations of McPherson suspension and steering system were set up by using R-W method of multi-rigid body system dynamics.The incidence matrix,route matrix,hinge vector matrix and system constraint equ... The kinematical equations of McPherson suspension and steering system were set up by using R-W method of multi-rigid body system dynamics.The incidence matrix,route matrix,hinge vector matrix and system constraint equations were educed.The optimization model of McPherson suspension steering mechanism was founded by regarding the McPherson suspension and steering system as an integrated system.In order to gain the best optimization effect,a continuous weighting function was created according to the requirement of steering system performance.Taking example for TJ7136U,the optimization design of McPherson suspension steering system was conducted in this paper. 展开更多
关键词 MECHANICS r-W method McPherson suspension optimization design weighting function
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Studies on the Synthesis, Growth and Characterization of ([Paranitrophenyl]Imino)Benzene NLO Crystal by Sankaranarayanan-Ramasamy Method
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作者 S. Anbarasu T. Kishore Kumar Prem Anand Devarajan 《Journal of Minerals and Materials Characterization and Engineering》 2013年第3期110-116,共7页
The study of imine-bridged organics has been the hot spot synthesis of second order nonlinear optical (SONLO) and photo-responsive materials in recent years. Herein we present a study of synthesis, growth, and charact... The study of imine-bridged organics has been the hot spot synthesis of second order nonlinear optical (SONLO) and photo-responsive materials in recent years. Herein we present a study of synthesis, growth, and characterization of ([paranitrophenyl]imino)benzene (PNPIB) NLO single crystal. The title compound was synthesized in one step by Schiff base formation. PNPIB single crystal of diameter of 40 mmand length 50 mmwas successfully grown by SR method using a seed as the nucleus. The growth rate formula is derived for the SR method. PNPIB single crystals of 10 mmdiameter and 60 mmheight have been grown at an average growth rate of 3 mmper day from the point seed in a glass crystallizer. Almost 100% stable crystal conversion efficiency was achieved. The as grown PNPIB crystals were characterized using single crystal X-ray diffraction (XRD), X-ray powder diffraction (XRPD), Fourier Transform Infrared (FTIR), Ultraviolet-Visible-Near Infrared (UV-Vis-NIR), 1H & 13C NMR spectral studies, dielectric measurement and NLO studies. Single crystal XRD analysis confirms that the grown ingot belongs to the space group of P2 of monoclinic system thus exhibiting noncentrosymmetric structure. The crystalline perfection was assessed by XRPD. The powder diffraction pattern of the grown crystal has been indexed. The presence of C=N bond with intramolecular hydrogen bonding and the protonation of ions were confirmed by FTIR analysis. The UV-Vis-NIR spectrum of the crystal shows that the crystal has a cut-off at 298 nm. The 1H & 13C NMR spectra confirm the molecular structure. The dielectric behaviour was measured in the frequency range 1 KHz - 10 KHz for the temperature range from 30℃ to 170℃. The slight decrease in dielectric constant has been observed as the frequency is increased and the dielectric loss is very low for the entire frequency range. The second harmonic generation (SHG) in the crystal was observed by Kurtz powder technique. 展开更多
关键词 Single CrYSTAL GrOWTH S-r method Nonlinear Optical Materials
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手动膜片钳检测盐酸罗哌卡因及其右旋异构体对HEK293细胞hERG电流的影响 被引量:1
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作者 王静文 徐代月 +1 位作者 陈华 尹利辉 《中国药物警戒》 2024年第4期391-396,共6页
目的研究比较盐酸罗哌卡因和盐酸罗哌卡因右旋异构体对高表达hERG钾通道的HEK293细胞hERG电流的影响。方法用手动膜片钳检测转染后hERG钾通道稳定表达的HEK293细胞电流,多菲莱德做阳性药,将盐酸罗哌卡因和盐酸罗哌卡因右旋异构体依次稀... 目的研究比较盐酸罗哌卡因和盐酸罗哌卡因右旋异构体对高表达hERG钾通道的HEK293细胞hERG电流的影响。方法用手动膜片钳检测转染后hERG钾通道稳定表达的HEK293细胞电流,多菲莱德做阳性药,将盐酸罗哌卡因和盐酸罗哌卡因右旋异构体依次稀释成30.00、10.00、3.33、1.11、0.37μmol·L^(-1),依次作用于细胞,记录电流变化,计算抑制率。结果盐酸罗哌卡因0.37、1.11、3.33、10、30μmol·L^(-1)对电流Iherg-tail的抑制率分别为(6.12±0.30)%、(13.04±1.20)%、(19.21±0.33)%、(35.56±0.66)%、(65.37±4.17)%,IC_(50)为19.482μmol·L^(-1)(n=15)。盐酸罗哌卡因右旋异构体0.37、1.11、3.33、10.00、30.00μmol·L^(-1)对电流Iherg-tail的抑制率分别为(4.13±3.43)%、(7.34±5.60)%、(9.49±2.75)%、(16.60±0.87)%、(31.36±1.45)%,IC_(50)>30μmol·L^(-1)(n=15)。阳性对照药品多菲莱德0.00185、0.00556、0.01667、0.05000、0.15000μmol·L^(-1)对电流Iherg-tail的抑制率分别为(7.81±2.77)%、(19.67±1.88)%、(57.16±4.39)%、(89.71±3.55)%、(99.66±0.89)%、IC_(50)为0.015μmol·L^(-1)(n=15)。结论和阳性对照药品多菲莱德比较,盐酸罗哌卡因对hERG通道为弱抑制作用,盐酸罗哌卡因右旋异构体对hERG通道为无明显抑制作用。 展开更多
关键词 盐酸罗哌卡因 盐酸罗哌卡因右旋异构体 酰胺类局麻药 手动膜片钳 HEK293细胞 HErG钾通道 立体选择性
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基于多试样法的PVC塑料J-R阻力曲线的简便测量方法
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作者 黄建伟 唐鹏飞 +3 位作者 潘栋 石拓 莫淑蓓 李颢旭 《压力容器》 北大核心 2024年第7期25-31,共7页
获得PVC材料的J-R阻力曲线以及断裂韧度J_(IC)的难点在于裂纹扩展量Δa的测量,传统染色处理以及三维测量等方法过程复杂且测试成本高。由于塑料的易切割性,可以简化Δa的测量过程。因此,基于多试样法,提出根据规范的测点要求对加载后的... 获得PVC材料的J-R阻力曲线以及断裂韧度J_(IC)的难点在于裂纹扩展量Δa的测量,传统染色处理以及三维测量等方法过程复杂且测试成本高。由于塑料的易切割性,可以简化Δa的测量过程。因此,基于多试样法,提出根据规范的测点要求对加载后的试件沿着裂纹纵向切割成若干片、再通过工业电子显微镜测量每个切割片上的裂纹长度,从而获得Δa的二维测量方法。通过GB 21143—2014和ASTM D6068-10两个标准,应用该方法均能获得相对一致的J-R阻力曲线和J_(IC)值,测试结果有效且准确。其中根据GB 21143—2014获得PVC的J_(IC)值为8.03 kJ/m^(2),J-R阻力曲线拟合方程的系数为9.93,指数为0.15;根据ASTM D6068-10获得PVC的J_(IC)为8.31 kJ/m^(2),J-R阻力曲线拟合方程的系数为12.7,指数为0.3;表明ASTM D6068-10获得PVC的断裂韧度J_(IC)值和拟合方程的系数、指数均大于GB 21143—2014。由于PVC材料与金属材料性能的差异,得出ASTM D6068-10更适用于测试PVC材料的J-R阻力曲线和J_(IC)值的结论。该方法将传统的裂纹染色处理和三维测量等复杂操作简化为切片和二维测量,简化测量过程,降低了测量成本,可普及应用于塑料断裂韧性的测量。 展开更多
关键词 J-r阻力曲线 断裂韧度J_(IC) 裂纹扩展量 多试样法 二维测量方法
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电力物联网用户侧负荷数据动态R-树匹配方法
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作者 胡为民 杜丰夷 +2 位作者 邓辉 闫超 刘晓峻 《电子设计工程》 2024年第7期106-109,114,共5页
电力物联网用户侧负荷数据维度较大,导致数据匹配延时时间过长,为了解决上述问题,基于动态R-树实现电力物联网用户侧负荷数据动态匹配。建立负荷计算模型,分析负荷历史运行信息,实现数据检测。通过归一化函数完成归一化处理,提取动态特... 电力物联网用户侧负荷数据维度较大,导致数据匹配延时时间过长,为了解决上述问题,基于动态R-树实现电力物联网用户侧负荷数据动态匹配。建立负荷计算模型,分析负荷历史运行信息,实现数据检测。通过归一化函数完成归一化处理,提取动态特征,构建动态R-树,确定匹配机制,根据矩阵计算函数完成压缩处理,利用动态匹配算法更新集对R-树内部结构进一步加以修改,在清除矩形之前,利用叶结点的Hash索引得到R-树匹配矩阵,使用Hash搜索准确地找到目标矩形,增强分布与交互仿真中的实时性,实现用户侧负荷数据动态匹配。实验结果表明,研究的动态R-树匹配方法在数据插入、数据匹配、数据维护过程中的延时时间低于48ms,实时性较好。 展开更多
关键词 电力物联网 用户侧负荷数据 数据动态 r-树匹配 匹配方法
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危标R值法失效的情况及解决办法研究
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作者 李靖 《工程质量》 2024年第7期67-70,共4页
论文根据某三层砖墙木屋盖的混合结构的鉴定评判,提出了多个基于JGJ 125-2016《危险房屋鉴定标准》中R值法的房屋鉴定评判失效的情况,这类情况计算的R值较小,最终房屋危险性评定为B级。然而这类情况的房屋状况较危险,实际房屋危险性更接... 论文根据某三层砖墙木屋盖的混合结构的鉴定评判,提出了多个基于JGJ 125-2016《危险房屋鉴定标准》中R值法的房屋鉴定评判失效的情况,这类情况计算的R值较小,最终房屋危险性评定为B级。然而这类情况的房屋状况较危险,实际房屋危险性更接近C级的释义。论文提出了将危标中的房屋危险性等级B级分成B1和B2两类的解决方法。经验证,该方法解决了被评判为B级但房屋实际状况较为危险的评判失效情况。 展开更多
关键词 房屋鉴定 r值法 评判失效 房屋危险性 等级判定
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