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涡量修正方法在切向炉内流场数值模拟中的应用
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作者 张文宏 沈滨 +1 位作者 何伯述 许晋源 《应用力学学报》 CAS CSCD 北大核心 1998年第4期87-91,共5页
涡量是流体运动的一个基本物理量,旋涡是流体运动中常见的一种基本形态,又是湍流的一种基本结构,它在理论上和工程实践中占有相当重要的位置。本文在吴镇远(J.C.Wu)方法的基础上,提出了一种新的数值计算方法——涡量修正方... 涡量是流体运动的一个基本物理量,旋涡是流体运动中常见的一种基本形态,又是湍流的一种基本结构,它在理论上和工程实践中占有相当重要的位置。本文在吴镇远(J.C.Wu)方法的基础上,提出了一种新的数值计算方法——涡量修正方法。对炉内速度场及涡量场进行了计算,其速度场的计算结果与实验基本符合,在网格划分基本相同的条件下与SIMPLE算法所得结果相比,涡量修正算法更接近于实验结果,为流场的数值模拟提供了一条新的途径。 展开更多
关键词 切向燃烧煤粉锅炉 数值模拟 修正方法
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浅谈CECS 03:2007《钻芯法检测混凝土强度技术规程》的技术特点 被引量:1
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作者 郭玉彬 《混凝土》 CAS CSCD 北大核心 2013年第10期57-58,71,共3页
对CECS 03:2007《钻芯法检测混凝土强度技术规程》修订后的一些技术特点进行了探讨与分析。
关键词 芯样直径 强度 推定区间 修正量方法
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浅谈《钻芯法检测混凝土强度技术规程》CECS03:2007的技术特点 被引量:2
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作者 郭玉彬 《工程建设标准化》 2014年第2期34-37,共4页
对《钻芯法检测混凝土强度技术规程》CECS03:2007修订后的一些技术特点进行了探讨与分析。
关键词 芯样直径 强度 推定区间 修正量方法
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MODIFIED LAYER REMOVAL METHOD FOR MEASUREMENT OF RESIDUAL STRESS DISTRIBUTION IN THICK PRE-STRETCHED ALUMINUM PLATE 被引量:9
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作者 WANGShu-hong ZUODun-wen WANGMin WANGZong-rong 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2004年第4期286-290,共5页
The integrated structure parts are widely used in aircraft. The distortion caused by residual stresses in thick pre-stretched aluminum plates during machining integrated parts is a common and serious problem. To predi... The integrated structure parts are widely used in aircraft. The distortion caused by residual stresses in thick pre-stretched aluminum plates during machining integrated parts is a common and serious problem. To predict and control the machining distortion, the residual stress distribution in the thick plate must be measured firstly. The modified removal method for measuring residual stress in thick pre-stretched aluminum plates is proposed and the stress-strain relation matrix is deduced by elasticity theory. The residual stress distribution in specimen of 7050T7451 plate is measured by using the method, and measurement results are analyzed and compared with data obtained by other methods. The method is effective to measure the residual stress. 展开更多
关键词 pre-stretched aluminum plate residual stress MEASUREMENT modified layer removal method
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Adiabatic correction for the esterification of acetic anhydride by methanol via accurate kinetics
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作者 Ze Dong Liping Chen +2 位作者 Yingying Ma Haoliang Peng Wanghua Chen 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第9期1954-1959,共6页
In the field of adiabatic correction for complex reactions,a simple one-stage kinetic model was used to estimate the real reaction kinetics.However,this assumption simplified the real process,inevitably generated inac... In the field of adiabatic correction for complex reactions,a simple one-stage kinetic model was used to estimate the real reaction kinetics.However,this assumption simplified the real process,inevitably generated inaccurate or even unsafe results.Therefore,it was necessary to find a new correction method for complex reactions.In this work,esterification of acetic anhydride by methanol was chosen as an object reaction of study.The reaction was studied under different conditions by Reaction Calorimeter(RC1).Then,Thermal Safety Software(TSS)was used to establish the kinetic model and estimate the parameters,where,activation energies for three stages were67.09,81.02,73.77 kJ?mol^(-1)respectively,and corresponding frequency factors in logarithmic form were 16.05,19.59,15.72 s^(-1).In addition,two adiabatic tests were performed by Vent Sizing Package2(VSP2).For accurate correction of VSP2 tests,a new correction method based on Enhanced Fisher method was proposed.Combined with kinetics,adiabatic correction of esterification reaction was achieved.Through this research,accurate kinetic parameters for a three-step kinetic model of the esterification reaction were acquired.Furthermore,the correlation coefficients between simulated curves and corrected curves were 0.976 and 0.968,which proved the accuracy of proposed new adiabatic correction method.Based on this new method,conservative corrected results were able to be acquired and be applied in safety assessment. 展开更多
关键词 Adiabatic correction KINETICS New method Complex reaction ESTERIFICATION Model reaction
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Spectroscopic Parameters of X^3∑^-, a^1△, and A^'3△ Electronic States of SO Radical
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作者 Jie-min Wang Heng-qiang Feng +2 位作者 Jin-feng Sun De-heng Shi Zun-lue Zhu 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2012年第5期533-539,I0003,共8页
The potential energy curves (PECs) of three low-lying electronic states (X^3∑, a^1△, and a^3△) of SO radical have been studied by ab initio quantum chemical method. The calcula- tions were carried out with the ... The potential energy curves (PECs) of three low-lying electronic states (X^3∑, a^1△, and a^3△) of SO radical have been studied by ab initio quantum chemical method. The calcula- tions were carried out with the full valence complete active space self-consistent field method followed by the highly accurate valence internally contracted multireference configuration in- teraction (MRCI) approach in combination with correlation-consistent basis sets. Effects of the core-valence correlation and relativistic corrections on the PECs are taken into account. The core-valence correlation correction is carried out with the cc-pCVDZ basis set. The way to consider the relativistic correction is to use the second-order Douglas-Kroll Hamiltonian approximation, and the correction is performed at the level of cc-pV5Z basis set. To obtain more reliable results, the PECs determined by the MRCI calculations are also corrected for size-extensivity errors by means of the Davidson modification (MRCI+Q). These PECs are extrapolated to the complete basis set limit by the two-point energy extrapolation scheme. With these PECs, the spectroscopic parameters are determined. 展开更多
关键词 Spectroscopic parameter Core-valence correlation Relativistic correction EXTRAPOLATION
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Self-consistency of a Modification Method Based on Membrane Model with Minimal Length Considered
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作者 Hao Tang Cheng-Yi Sun +2 位作者 Bin Wu Yu Song Rui-Hong Yue 《Communications in Theoretical Physics》 SCIE CAS CSCD 2018年第9期299-302,共4页
By adopting a result from generalized uncertainty principles (GUP), we modify the inner bound of the membrane model to a physical fixed value and get the cut-offs naturally rather than by hand, which are both in brick... By adopting a result from generalized uncertainty principles (GUP), we modify the inner bound of the membrane model to a physical fixed value and get the cut-offs naturally rather than by hand, which are both in brickwall model and membrane model, and the semi-classical quantization condition could always be valid as well. We also calculate the entropies of Schwarzschild-de Sitter black hole and find the GUP we choose qualitatively shows that the requirement of mass in this method is the same as the natural requirement of the Schwarzschild-de Sitter black hole,which means the method might be self-consistent. 展开更多
关键词 ENTROPY black hole generalized uncertainty principle brick-wall model membrane model
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