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“硬果夹”理论对传统经济周期理论的超越 被引量:1
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作者 孙寿涛 《生产力研究》 CSSCI 2004年第10期17-19,共3页
谢尔曼的“硬果夹”理论超越了以马克思、米切尔、凯恩斯和卡勒斯基四位大师的理论为代表的传统经济周期理论 ,构建了一个更具综合性的宏观经济理论。他认为 ,内生的或内部的因素是资本主义经济周期的主要根源 ,并将以往强调内生因素的... 谢尔曼的“硬果夹”理论超越了以马克思、米切尔、凯恩斯和卡勒斯基四位大师的理论为代表的传统经济周期理论 ,构建了一个更具综合性的宏观经济理论。他认为 ,内生的或内部的因素是资本主义经济周期的主要根源 ,并将以往强调内生因素的理论分为两派 ,一派强调消费需求 ,另一派则强调供给成本。他超越这两派的理论 ,综合供给与需求、成本和收入两方面因素 ,建构了一个所谓双面挤压的“利润挤压论” ,即“硬果夹” 展开更多
关键词 “硬果夹”理论 经济周期 利润 “利润挤压论” 投资 消费
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谁为公有制理论大厦添砖加瓦——有感于西方产权理论的私有制辩护性质 被引量:2
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作者 武建奇 《当代经济研究》 CSSCI 北大核心 2009年第12期26-29,共4页
西方经济学家围绕为私有制辩护这个主题进行研究开发,新理论层出不穷,有着颇具学术色彩的概念范畴,个个都是"硬理论",都在从不同角度为私有制提供理论根据,而对公有制理论大厦则是一种侵蚀、消解,釜底抽薪。马克思主义经济学... 西方经济学家围绕为私有制辩护这个主题进行研究开发,新理论层出不穷,有着颇具学术色彩的概念范畴,个个都是"硬理论",都在从不同角度为私有制提供理论根据,而对公有制理论大厦则是一种侵蚀、消解,釜底抽薪。马克思主义经济学家有责任创造出为公有制辩护的经济学新理论、"硬理论"。新理论要注重经济学"范畴革命"。我国经济学论著很多,但没有形成多少令人过目不忘的"硬范畴"。学术研究要想沉淀、积累,增加存量,就要把有价值的经济思想提炼、升华、"硬化"成一些易于把握,便于传播和能够积累的理论"硬核"———科学范畴,把一个复杂的道理用准确而简明的概念表达出来。 展开更多
关键词 私有制理论 公有制理论 辩护性质 范畴革命 “硬理论”
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福建地产“硬花境”园林产品营造论 被引量:4
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作者 廖连富 《福建建筑》 2011年第5期35-36,共2页
本文通过传统意义上的花境与现代意义的"硬花境"对比,从分析"硬花境"的学术理论和色彩理论出发,通过理论结合实践阐述"硬花境"的营造方法。
关键词 “硬花境”构图理论 色彩理论 “硬花境素材”
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The effect of copper valence on catalytic combustion of styrene over the copper based catalysts in the absence and presence of water vapor 被引量:2
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作者 Hongyan Pan Zhiyan He +2 位作者 Qian Lin Fei Liu Zhong Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第4期468-474,共7页
Catalysts CuOx/γ,-Al2O3-IH and CuOx/γ/-Al2O3-IM were prepared, characterized, and tested for styrene combustion in the absence and presence of water vapor. The effect of copper valence of the catalysts on the cataly... Catalysts CuOx/γ,-Al2O3-IH and CuOx/γ/-Al2O3-IM were prepared, characterized, and tested for styrene combustion in the absence and presence of water vapor. The effect of copper valence of the catalysts on the catalytic activity for styrene combustion was discussed using the theory of hard soft acids and bases (HSAB). The results showed that the existence of water vapor in feed stream inhibited the catalytic activity for styrene combustion due to the competition adsorption of water molecule. HSAB theory confirmed that the local soft acidity of the catalyst CuOx/^-AI203-1H was much stronger than that of the catalyst CuOx/^-AI203-1M because of the higher content of soft acid Cu+ on its surface, which increased the adsorption ability toward soft base of styrene and reduced the adsorption toward hard base of water vapor, and thus increased the catalytic activity for styrene combustion and weakened the negative influence of water vapor. 展开更多
关键词 Catalyst combustionStyreneCopper based catalystsWater inhibitionTheow of hard soft acids and bases
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Influence of material models on theoretical forming limit diagram prediction for Ti-6Al-4V alloy under warm condition 被引量:2
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作者 Nitin KOTKUNDE Sashank SRINIVASAN +2 位作者 Geetha KRISHNA Amit Kumar GUPTA Swadesh Kumar SINGH 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第3期736-746,共11页
Forming limit diagram (FLD) is an important performance index to describe the maximum limit of principal strains that can be sustained by sheet metals till to the onset of localized necking. It offers a convenient and... Forming limit diagram (FLD) is an important performance index to describe the maximum limit of principal strains that can be sustained by sheet metals till to the onset of localized necking. It offers a convenient and useful tool to predict the forming limit in the sheet metal forming processes. In the present study, FLD has been determined experimentally for Ti?6Al?4V alloy at 400 °C by conducting a Nakazima test with specimens of different widths. Additionally, for theoretical FLD prediction, various anisotropic yield criteria (Barlat 1989, Barlat 1996, Hill 1993) and different hardening models viz., Hollomon power law (HPL), Johnson?Cook (JC), modified Zerilli–Armstrong (m-ZA), modified Arrhenius (m-Arr) models have been developed. Theoretical FLDs have been determined using Marciniak and Kuczynski (M?K) theory incorporating the developed yield criteria and constitutive models. It has been observed that the effect of yield model is more pronounced than the effect of constitutive model for theoretical FLDs prediction. However, the value of thickness imperfection factor (f0) is solely dependent on hardening model. Hill (1993) yield criterion is best suited for FLD prediction in the right hand side region. Moreover, Barlat (1989) yield criterion is best suited for FLD prediction in left hand side region. Therefore, the proposed hybrid FLD in combination with Barlat (1989) and Hill (1993) yield models with m-Arr hardening model is in the best agreement with experimental FLD. 展开更多
关键词 Ti-6Al-4V alloy yield criteria hardening model Marciniak and Kuczynski theory forming limit diagram
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Research on the Relationship between Molecular Activity of Additives and Lubricating Performance of Aluminum Rolling Oil 被引量:6
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作者 Xia Lei Sun Jianlin +2 位作者 Zeng Yingfeng Zhang Min Duan Qinghua 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2013年第3期13-18,共6页
In this paper,an ab initio,local density functional(LDF)method was used to explore the relationship between the molecular properties of additives and the lubricating performance of aluminum rolling oil.The structural ... In this paper,an ab initio,local density functional(LDF)method was used to explore the relationship between the molecular properties of additives and the lubricating performance of aluminum rolling oil.The structural properties of butyl stearate,dodecanol,docosanol,and methyl dodecanoate were studied according to the density functional theory.The calculated data showed that the atoms in or around the functional groups might be likely the reacting sites.Because of the different functional groups and structure of ester and alcohol,two types of complex additives,dodecanol and butyl stearate,methyl dodecanoate and butyl stearate,respectively,were chosen for studying their tribological properties and performing aluminum cold rolling experiments.The test results agreed with the calculated results very well.The complex ester,viz.methyl dodecanoate and butyl stearate,had the best lubricating performance with a friction coefficient of 0.084 1 and a permissive-rolling thickness of 0.040 mm as compared with that of dodecanol-butyl stearate-base oil formulation. 展开更多
关键词 ALUMINUM ROLLING molecular properties lubricating performance DFT
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Phase Transitions in a Mixture of Hard-Sphere Dipoles and Neutral Hard Spheres
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作者 LI Li LI Liang-Sheng CHEN Xiao-Song 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第9期523-526,共4页
Using the reference hypernetted chain (RHNC) integral equation theory and a rigorous stability analysis method, we investigate the phase behavior of a mixture of hard-sphere dipoles and neutral hard spheres based on... Using the reference hypernetted chain (RHNC) integral equation theory and a rigorous stability analysis method, we investigate the phase behavior of a mixture of hard-sphere dipoles and neutral hard spheres based on the correlations of the homogeneous isotropic phase. Lowering the temperature down to the points where the RHNC equations fail to have a solution, several ttuctuations strongly increase. At low densities our results indicate the onset of / chain formation, which is similar with the pure DHS system. At high densities, the results indicate the appearance of isotropic-to-ferroelectric transitions (small neutral hard spheres concentrations) and demixing transitions (large neutral hard spheres concentrations). 展开更多
关键词 integral equations phase transition dipolar fluids
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How to Extend the Bridge Density Functional Approximation to the Confined Non-hard Sphere Fluid
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作者 Shi-qi Zhou 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 北大核心 2006年第4期319-324,共6页
A theoretical method was proposed to extend a bridge density functional approximation (BDFA) for the non-uniform hard sphere fluid to the non-uniform Lennard-Jones (LJ) fluid. The DFT approach for LJ fluid is simp... A theoretical method was proposed to extend a bridge density functional approximation (BDFA) for the non-uniform hard sphere fluid to the non-uniform Lennard-Jones (LJ) fluid. The DFT approach for LJ fluid is simple, quantitatively accurate in a wide range of coexistence phase and external field parameters. Especially, the DFT approach only needs a second order direct correlation function (DCF) of the coexistence bulk fluid as input, and is therefore applicable to the subcritical temperature region. The present theoretical method can be regarded as a non-uniform counterpart of the thermodynamic perturbation theory, in which it is not at the level of the free energy but at the level of the second order DCF.the National Natural Science Foundation of China (No. 20546004) and the Natural Science Foundation of Education Department of Hunan Province (No.04C711). 展开更多
关键词 Density functional theory Bridge density functional approximation Hard sphere fluid Correlation function
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Local dynamic balance theory and technology of flow field in multilayer gob area 被引量:1
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作者 JIN Zhi-xin YU Bin 《Journal of Coal Science & Engineering(China)》 2012年第2期143-146,共4页
Flow field in multilayer gob area, which formed in small hiden-depth, multi-coal layer groups, close distance, hard coal layer, and hard roof, possesses characteristics such as complex, changeable and unstable. Dynami... Flow field in multilayer gob area, which formed in small hiden-depth, multi-coal layer groups, close distance, hard coal layer, and hard roof, possesses characteristics such as complex, changeable and unstable. Dynamic balance theory of local flow field in multilayer gob area was built based on the realistic requirement that the serious threat on current mining coal layer by large-scale spontaneous combustion fire on close spontaneous combustion coal layer group of Datong Coal mining area at the 'di-hard' conditions was caused by small coal pit mining. The kernel was in dynamic balance between flow field pressures of working face and local flow field in multilayer gob area was kept by transformation. Corresponding technology and set of devices were developed. 展开更多
关键词 local dynamic balance flow field in multilayer gob area spontaneous combustion variable pressure control
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Application of the HSAB principle for the quantitative analysis of nucleophilicity/basicity of organic compounds with lone-pair electrons
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作者 郑铮 刘振明 《Journal of Chinese Pharmaceutical Sciences》 CAS 2011年第2X期125-132,共8页
Based on the density functional theory,we described here a method to investigate the quantitative relationship between nucleophilicity/basicity and HSAB-theory-based properties of compounds with lone-pair electrons.De... Based on the density functional theory,we described here a method to investigate the quantitative relationship between nucleophilicity/basicity and HSAB-theory-based properties of compounds with lone-pair electrons.Descriptors including global softness,Fukui function,local softness and local mulliken charge were calculated at SVWN/DN~* level of DFT with PC Spartan Pro.Nucleophilicity and basicity of 28 selected compounds were classified based on intensity.BP algorithm of artificial neural network(ANN) was employed to study the relationship between the descriptors and nucleophilicity/basicity.Cross-validation was carried out to avoid the over-fitting in training of ANN.A BP network was trained to quantify the relationship between HSAB-theory-based properties and nucleophilicity/basicity of compounds with lone-pair electrons.The results show that the prediction based on the network matches with the experimental results well.The local softness and Fukui function have a better relationship with nucleophilicity and local mulliken charge than with the basicity.The trained BP network could be utilized for predicting the nucleophilicity/basicity of compounds or functional groups with lone-pair electrons. 展开更多
关键词 HSAB theory Nucleophilicity/Basicity Density functional theory Fukui function Artificial neural networks Cross-validation Lone-pair electrons
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Correlation between Traditional Chinese Medicine symptom patterns and serum concentration of zinc,iron,copper and magnesium in patients with hepatitis B and associated liver cirrhosis 被引量:6
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作者 Teng Lichun Zhang Jiongshan +2 位作者 Dai Min Wang Fenglin Yang Hongzhi 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2015年第5期546-550,共5页
OBJECTIVE:To investigate the correlation between the patterns of Traditional Chinese Medicine(TCM)syndromes and the serum concentration of zinc,iron,copper and magnesium of patients with chronic hepatitis B(CHB) and h... OBJECTIVE:To investigate the correlation between the patterns of Traditional Chinese Medicine(TCM)syndromes and the serum concentration of zinc,iron,copper and magnesium of patients with chronic hepatitis B(CHB) and hepatitis B virus(HBV)-induced liver cirrhosis.METHODS:A total of 86 patients were included in the study between March 1,2009 and January 1,2010.All were diagnosed with CHB or HBV-induced liver cirrhosis according to the diagnosis standard of the Chinese Medical Association.Fasting serum concentrations of zinc,iron,copper and magnesium were measured.Patients were classified into different patterns of TCM symptoms according to TCM theory and clinical experience.RESULTS:In the HBV-induced liver cirrhosis group,the mean zinc concentration in patients with the TCM pattern of stagnation of fluid-Dampness was lower than that in patients with obstruction of collaterals by Blood stasis(P < 0.034).In the CHB group,the mean magnesium concentration in patients with toxic Heat flourishing was significantly lower than that in those with Damp-Heat in the Liver and Gallbladder,and those with Liver depression and Spleen deficiency(P < 0.021).The concentrations of iron and copper showed little difference among the different TCM symptom patterns.CONCLUSION:The serum zinc and magnesium concentrations correlated with certain TCM patterns of symptoms in patients with HBV-induced liver cirrhosis and CHB.It may be helpful to interpret the pathogenic change in the TCM symptom patterns in liver cirrhosis and CHB,and also to conduct clinical treatment of the diseases based on identified TCM patterns. 展开更多
关键词 Hepatitis B Fibrosis Serum Pattern of symptoms Medicine Chinese traditional
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Analytical solution for concentration distribution in an open channel flow with phase exchange kinetics
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作者 Swamp Barik D.C.Dalal 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2022年第3期64-77,I0002,共15页
This study is about an analytical attempt that explores the two-dimensional concentration distribution of a solute in an open channel flow.The solute undergoes reversible sorption at the channel bed.The method of mult... This study is about an analytical attempt that explores the two-dimensional concentration distribution of a solute in an open channel flow.The solute undergoes reversible sorption at the channel bed.The method of multiple scales is used to find the two-dimensional concentration distribution,which is important for modem day application in industry,environmental risk assessment,etc.Study deduces an analytic expression of two-dimensional concentration distribution for an open channel flow with sorptive channel bed.Effects of retention parameter,Darnkohler number on the solute dispersion are also discussed in this paper.Results reveal that slow or strong kinetics(small value of Darnkohler number)increases solute dispersion.It is also observed.that for slow phase exchange kinetics between bulk flow and small retentive channel bed,solute concentration distribution will uniform faster than their inert counterpart. 展开更多
关键词 Multi-scale method Dispersion coefficient Two-dimensional concentration distribution Phase exchange kinetics
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Generalized Aifantis strain gradient plasticity model with internal length scale dependence on grain size,sample size and strain
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作者 Jianfeng Zhao Bo Zhang +3 位作者 Dabiao Liu Avraam A.Konstantinidis Guozheng Kang Xu Zhang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2022年第3期86-93,I0003,共9页
The internal length scale(ILS)is a dominant parameter in strain gradient plasticity(SGP)theories,which helps to successfully explain the size effect of metals at the microscale.However,the ILS is usually introduced in... The internal length scale(ILS)is a dominant parameter in strain gradient plasticity(SGP)theories,which helps to successfully explain the size effect of metals at the microscale.However,the ILS is usually introduced into strain gradient frameworks for dimensional consistency and is model-dependent.Even now,its physical meaning,connection with the microstructure of the material,and dependence on the strain level have not been thoroughly elucidated.In the current work,Aifantis'SGP model is reformulated by incorporating a recently proposed power-law relation for strain-dependent ILS.A further extension of Aifantis'SGP model by including the grain size effect is conducted according to the Hall-Petch formulation,and then the predictions are compared with torsion experiments of thin wires.It is revealed that the ILS depends on the sample size and grain size simultaneously;these dependencies are dominated by the dislocation spacing and can be well described through the strain hardenmg exponent.Furthermore,both the original and generalized Aifantis models provide larger estimated values for the ILS than Fleck-Hutchinson's theory. 展开更多
关键词 Strain gradient plasticity theory Internal length scale Sample size Grain size
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