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读书活动中“理论热”的成因及其特点
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作者 张梅生 《社会科学》 1986年第7期76-77,共2页
在方兴未艾的职工读书热潮中,正悄悄地出现一股学习理论的热流。卷进这股热流的,大多是青年干部和青年知识分子。他们自愿组成各种读书小组,努力学习马列主义,广泛了解西方当代理论研究的新动向,密切注视经济体制改革的进程,并试图运用... 在方兴未艾的职工读书热潮中,正悄悄地出现一股学习理论的热流。卷进这股热流的,大多是青年干部和青年知识分子。他们自愿组成各种读书小组,努力学习马列主义,广泛了解西方当代理论研究的新动向,密切注视经济体制改革的进程,并试图运用新的观点和方法。 展开更多
关键词 “理论热” 青年知识分子 读书活动 经济体制改革 职工 青年干部 思想 马列主义 理论研究
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文学批评“理论化”及其不满的精神现象
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作者 姜肖 《当代文坛》 CSSCI 北大核心 2023年第3期41-48,共8页
在1990年代以降的思想史视野中,当代文学批评“理论化”及其反思,镌刻着现代性历史实践的精神印痕。这一现象的发生,一方面根源于20世纪后半叶现代理论形态的激进易变性与时代感觉结构的契合,另一方面则源于文化思想界认识自身和解释世... 在1990年代以降的思想史视野中,当代文学批评“理论化”及其反思,镌刻着现代性历史实践的精神印痕。这一现象的发生,一方面根源于20世纪后半叶现代理论形态的激进易变性与时代感觉结构的契合,另一方面则源于文化思想界认识自身和解释世界的迫切需求,对理论的选择意味着“人”对自我的想象。新世纪以来围绕批评“理论化”的反思,则从理论与批评的边界问题,逐步深化为对理论形态及其范式有效性的探讨,内涵着启蒙主体内在紧张与重建价值真实性的双向思想脉络。基此“理论化”的症结不单在于能否“回到文学”,也在于理论形态演进与时代精神状况之间的关系。对于当下而言,或许也应关注“心灵真实”对现代主体完整性的作用,从而缓解文学批评的理论焦虑。 展开更多
关键词 “理论热” 批评主体 后现代主义 真实性 文学性
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Structural Characterization and Thermal Properties of 1-Amino-1- ethylamino-2,2-dinitroethylene 被引量:2
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作者 徐抗震 赵凤起 +3 位作者 王锋 王晗 罗金安 胡荣祖 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2010年第3期335-341,I0002,共8页
1-amino-1-ethylamino-2,2-dinitroethylene (AEFOX-7) was synthesized by the reaction of 1,1- diamino-2,2-dinitroethylene (FOX-7) and ethylamine aqueous solution at 92 ℃. The the- oretical investigation on AEFOX-7 w... 1-amino-1-ethylamino-2,2-dinitroethylene (AEFOX-7) was synthesized by the reaction of 1,1- diamino-2,2-dinitroethylene (FOX-7) and ethylamine aqueous solution at 92 ℃. The the- oretical investigation on AEFOX-7 was carried out by B3LYP/6-311++G^** method. The IR frequencies and NMR chemical shifts were performed and compared with the experimental results. The thermal behavior of AEFOX-7 was studied with differential scanning calorimetry and thermal gravity-derivative thermogravimetry methods, and can be divided into a melting process and an exothermic decomposition process. The enthalpy, apparent activation energy and pre-exponential factor of the exothermic decomposition reaction were obtained as 374.88 kJ/mol, 169.7 kJ/mol, and 10^19.24 s^-1, respectively. The critical temperature of thermal explosion of AEFOX-7 is 145.2 ℃. The specific heat capacity of AEFOX-7 was determined with micro-DSC method and theoretical calculation method, and the molar heat capacity is 214.50 J/(mol K) at 298.15 K. The adiabatic time-to-explosion of AEFOX-7 was calculated to be a certain value between 1.38-1.40 s. The thermal stability of AEFOX-7 is much lower than that of FOX-7. 展开更多
关键词 1-Amino-l-ethylamino-2 2-dinitroethylene 1 1-Diamino-2 2-dinitroethylene Thermal behavior Theoretical calculation Adiabatic time-to-explosion
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Thermodynamic model of lead oxide activity in PbO-CaO-SiO_2-FeO-Fe_2O_3 slag system
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作者 汪金良 温小椿 张传福 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第5期1633-1639,共7页
According to the ion and molecule coexistence theory, a thermodynamic model of lead oxide activity in PbO-CaO-SiO2-FeO-Fe2O3 slag system was established at the temperature of 1273-1733 K. The activities of Pb O in sla... According to the ion and molecule coexistence theory, a thermodynamic model of lead oxide activity in PbO-CaO-SiO2-FeO-Fe2O3 slag system was established at the temperature of 1273-1733 K. The activities of Pb O in slag were calculated, and their equal activity curves were plotted. The influences of slag basicity Q, iron oxide rate R and temperature T on activity NPb O and activity coefficient γPbO were also investigated. Results show that the calculated values of γPb O are in good agreement with the reported experimental data, showing that the model can wholly embody the slag structural characteristics. NPbO departures positively from Raoult values, and increases with increasing Pb O content in slag but changes little with T. γPbO increases with increasing Q, and goes through the maximum with increasing R for basic slag(Q0.3). Results can be applied to the thermodynamic research and operational optimization of modern lead smelting technologies. 展开更多
关键词 ion and molecule coexistence theory thermodynamic model lead oxide ACTIVITY
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Microthermokinetic study of xanthate adsorption on impurity-doped galena 被引量:10
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作者 蓝丽红 陈建华 +3 位作者 李玉琼 蓝平 杨卓 艾光湧 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第1期272-281,共10页
Six kinds of galena with different impurities were synthesized and the effects of impurities on the floatability of galena were investigated. The thermodynamic and kinetic parameters on the galena surface were measure... Six kinds of galena with different impurities were synthesized and the effects of impurities on the floatability of galena were investigated. The thermodynamic and kinetic parameters on the galena surface were measured using microcalorimetry, and the adsorption configuration and energy of butyl xanthate on the surfaces of galena with different impurities were simulated by density functional theory. Flotation experiments showed that Ag and Bi significantly promoted the recovery of galena, while Zn, Sb, Mn, and Cu reduced the recovery of the flotation. Microthermokinetic results indicated that the absolute value of xanthate adsorption heat was directly proportional to the flotation recovery of galena. Adsorption heat and reaction rate coefficients of xanthate on galena containing Ag or Bi were larger than those on pure galena, but smaller on galena containing Cu or Sb. Additionally, the relationship between the heat of unsaturated adsorption of xanthate and the adsorption energy of impurity atom on galena surface was investigated. 展开更多
关键词 GALENA impurity effect floatation XANTHATE ADSORPTION MICROCALORIMETRY density functional theory
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关于建设文艺创作之新坐标的断想
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作者 金丹元 《云南民族大学学报(哲学社会科学版)》 1988年第3期46-51,共6页
近几年来的创作,出现了与新时期文学头几年之作品迥然有别的气象。象征主义的写作手法、存在主义哲学观念和弗洛伊德精神分析学的影响等杂揉在一起,成了具有超越意识的心灵的物化形态。传统的思维方式与当代观念之间的矛盾,使人们对旧... 近几年来的创作,出现了与新时期文学头几年之作品迥然有别的气象。象征主义的写作手法、存在主义哲学观念和弗洛伊德精神分析学的影响等杂揉在一起,成了具有超越意识的心灵的物化形态。传统的思维方式与当代观念之间的矛盾,使人们对旧的审美规范本身产生了怀疑。很显然,近几年来的现代主义倾向,与不久前的“理论热”、“文化热”有着内在联缀。例如。 展开更多
关键词 新时期文学 象征主义 “理论热” 现代主义 存在主义哲学 思维方式 写作手法 文化 物化形态 文艺创作
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Theoretical prediction of forming limit diagram of AZ31 magnesium alloy sheet at warm temperatures 被引量:3
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作者 曹晓卿 徐平平 +1 位作者 樊奇 王文先 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第9期2426-2432,共7页
A theoretical prediction on forming limit diagram(FLD) of AZ31 magnesium alloy sheet was developed at warm temperatures based on the M-K theory. Two different yield criteria of von Mises and Hill'48 were applied in... A theoretical prediction on forming limit diagram(FLD) of AZ31 magnesium alloy sheet was developed at warm temperatures based on the M-K theory. Two different yield criteria of von Mises and Hill'48 were applied in this model. Mechanical properties of AZ31 magnesium alloy used in the prediction were obtained by uniaxial tensile tests and the Fields-Backofen equation was incorporated in the analysis. In addition, experimental FLDs of AZ31 were acquired by conducting rigid die swell test at different temperatures to verify the prediction. It is demonstrated from a comparison between the predicted and the experimental FLDs at 473 K and 523 K that the predicted results are influenced by the type of yield criterion used in the calculation, especially at lower temperatures. Furthermore, a better agreement between the predicted results and experimental data for AZ31 magnesium alloy sheet at warm temperatures was obtained when Hill'48 yield criterion was applied. 展开更多
关键词 magnesium alloy forming limit diagram theoretical prediction yield criterion sheet warm forming
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Quantum Chemical Studies on Structure and Detonation Performance of Bis(2,2-dinitropropyl ethylene)formal
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作者 闫淑卿 李小红 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2014年第1期45-50,I0003,共7页
Based on the full optimized molecular geometric structures via B3LYP/6-311+G(2d,p) method, a new gem-dinitro energetic plasticizer, bis(2,2-dinitropropyl ethylene)formal was investigated in order to search for hi... Based on the full optimized molecular geometric structures via B3LYP/6-311+G(2d,p) method, a new gem-dinitro energetic plasticizer, bis(2,2-dinitropropyl ethylene)formal was investigated in order to search for high-performance energetic material. IR spectrum, heat of formation, and detonation performances were predicted. The bond dissociation energies and bond orders for the weakest bonds were analyzed to investigate the thermal stability of the title compound. The results show that the four N-NO2 BDEs are nearly equal to the values of 164.38 kJ/mol, which shows that the title compound is a stable compound. The detonation velocity and pressure were evaluated by using Kamlet-Jacobs equations based on the theoretical density and condensed HOF. The crystal structure obtained by molec-ular mechanics belongs to P21 space group, with lattice parameters Z=2, a=13.8017 A, b=13.4072 A, c=5.5635 A. 展开更多
关键词 Density functional theory Detonation property Thermal stability bis(2 2-dinitropropyl ethylene) formal
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Pyrolysis Mechanisms of Quinoline and Isoquinoline with Density Functional Theory 被引量:5
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作者 凌丽霞 章日光 +1 位作者 王宝俊 谢克昌 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第5期805-813,共9页
The pyrolysis mechanisms of quinoline and isoquinoline were investigated using the density functional theory of quantum chemistry,including eight reaction paths and a common tautomeric intermediate 1-indene imine.It i... The pyrolysis mechanisms of quinoline and isoquinoline were investigated using the density functional theory of quantum chemistry,including eight reaction paths and a common tautomeric intermediate 1-indene imine.It is concluded that the conformational tautomerism of the intermediate decides the pyrolysis products(C6H6,HC≡C—C≡N,C6H5C≡N and HC≡CH)to be the same,and also decides the total disappearance rates of the reactants to be the same,for both original reactants quinoline and isoquinoline during the pyrolysis reaction.The results indicate that the intramolecular hydrogen migration is an important reaction step,which often appears in the paths of the pyrolysis mechanism.The activation energies of the rate determining steps are obtained.The calculated results are in good agreement with the experimental results. 展开更多
关键词 QUINOLINE ISOQUINOLINE COAL pyrolysis mechanism density functional theory
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NONLINEAR MODEL OF THERMOVISCOELASTICITY UNDER VARYING TEMPERATURE AND ITS APPLICATIONS IN DESIGN OF THE MOLDS OF CRT GLASS BULB
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作者 张义同 刘伯伟 徐家福 《Transactions of Tianjin University》 EI CAS 2000年第1期55-59,共5页
A non linear constitutive model is suggested for the thermoviscoelastic materials that undergo varying temperature histories.The description of the model is based on the concepts similar to those in a linear thermovi... A non linear constitutive model is suggested for the thermoviscoelastic materials that undergo varying temperature histories.The description of the model is based on the concepts similar to those in a linear thermoviscoelastic model,such as relaxation surface at constant temperatures,relaxation curve along a varying temperature history and equivalent relaxation curve in the terminal temperature plane.The non linear model has been applied to the simulation of deformation of the molds of CRT glass bulb.The numerical results show better agreements with the measured data of the molds than the ones based on the linear model. 展开更多
关键词 RELAXATION thermal stress theory of thermoviscoelasticity
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Thermal Wigner Operator in Coherent Thermal State Representation and Its Application 被引量:3
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作者 FANHong-Yi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第3期289-292,共4页
In the coherent thermal state representation we introduce thermal Wigner operator and find that it is'squeezed' under the thermal transformation. The thermal Wigner operator provides us with a new direct and n... In the coherent thermal state representation we introduce thermal Wigner operator and find that it is'squeezed' under the thermal transformation. The thermal Wigner operator provides us with a new direct and neatapproach for deriving Wigner functions of thermal states. 展开更多
关键词 coherent thermal state thermal Wigner operator
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Perturbation to Symmetries and Adiabatic Invariants of Nonholonomic System in Terms of Quasi-coordinates 被引量:4
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作者 CHEN Xiang-Wei ZHAO Yong-Hong LI Yan-Min 《Communications in Theoretical Physics》 SCIE CAS CSCD 2005年第5X期773-778,共6页
Based on the theory of Lie symmetries and conserved quantities, the exact invariants and adiabatic invariants of nonholonomic system in terms of quasi-coordinates are studied. The perturbation to symmetries for the no... Based on the theory of Lie symmetries and conserved quantities, the exact invariants and adiabatic invariants of nonholonomic system in terms of quasi-coordinates are studied. The perturbation to symmetries for the nonholonomic system in terms of quasi-coordinates under small excitation is discussed. The concept of high-order adiabatic invariant is presented, and the forms of exact invariants and adiabatic invariants as well as the conditions for their existence are given. Then the corresponding inverse problem is studied. 展开更多
关键词 nonholonomic system in terms of quasi-coordinates PERTURBATION exact invariant adiabatic invariant
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Thermodynamic Properties for Polybrominated Dibenzothiophenes by Density Functional Theory 被引量:2
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作者 李加友 柳红霞 +2 位作者 于红霞 王遵尧 王连生 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第6期999-1008,共10页
The thermodynamic properties of 135 polybrominated dibenzothiophenes (PBDTs) in the gaseous state at 298.15 K and 1.013×10^5 Pa, are calculated using the density functional theory (the B3LYP/6-311G^**) wit... The thermodynamic properties of 135 polybrominated dibenzothiophenes (PBDTs) in the gaseous state at 298.15 K and 1.013×10^5 Pa, are calculated using the density functional theory (the B3LYP/6-311G^**) with Gaussian 03. Based on these data, the isodesmic reacflons are designed to calculate the standard enthalpy of formation (△fH^θ) and the standard Gibbs energy of formation (△fG^θ) of PBDTs. The relations of these thermodynamic parameters with the number and positionof bromine subsfituents (NPBS) are discussed, and it is found that there exist good correlations between othermody namic parameters (including heat capacity at constant volume, entropy, enthaipy, free energy, △fH^θ, △fG^θ) and NPBS. Thoe relative stability order of PBDT congeners is proposed theoretically based on the relative magnitude of their △fG^θ. In addition, the values of molar heat capacities at constant pressure (Cp,m) for PBDT c ongelaers are calculated. 展开更多
关键词 polybrominated dibenzothiophenes density functional theory method of position of substituted Br atom thermodynamic parameters relative stability
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Modeling and application of thermal contact resistance of ball screws 被引量:3
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作者 GAO Xiang-sheng WANG Min LIU Xue-bin 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第1期168-183,共16页
Aiming at determining the thermal contact resistance of ball screws,a new analytical method combining the minimum excess principle with the MB fractal theory is proposed to estimate thermal contact resistance of ball ... Aiming at determining the thermal contact resistance of ball screws,a new analytical method combining the minimum excess principle with the MB fractal theory is proposed to estimate thermal contact resistance of ball screws considering microscopic fractal characteristics of contact surfaces.The minimum excess principle is employed for normal stress analysis.Moreover,the MB fractal theory is adopted for thermal contact resistance.The effectiveness of the proposed method is validated by self-designed experiment.The comparison between theoretical and experimental results demonstrates that thermal contact resistance of ball screws can be obtained by the proposed method.On this basis,effects of fractal parameters on thermal contact resistance of ball screws are discussed.Moreover,effects of the axial load on thermal contact resistance of ball screws are also analyzed.The conclusion can be drawn that the thermal contact resistance decreases along with the fractal dimension D increase and it increases along with the scale parameter G increase,and thermal contact resistance of ball screws is retained almost constant along with axial load increase before the preload of the right nut turns into zero in value.The application of the proposed method is also conducted and validated by the temperature measurement on a self-designed test bed. 展开更多
关键词 ball screw fractal theory thermal contact resistance contact stress PRELOAD
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Theoretical and Practical Progress of New Heliostat by Chen et al. 被引量:55
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作者 A. Kribus 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第1期163-164,共2页
Recently, Chen and his team were active in the theoretical and practical study of a new heliostat for the use of solar energy. This work represents the first innovation in the area of heliostats after many years of li... Recently, Chen and his team were active in the theoretical and practical study of a new heliostat for the use of solar energy. This work represents the first innovation in the area of heliostats after many years of little progress. The mathematical development of the tracking and concentration optics principles, and the practical implementation and demonstration of the technology, are both very interesting advances in this field. Many applications are possible for this technology such as generation of solar electricity and solar industrial process heat. 展开更多
关键词 solar energy CONCENTRATOR astigmatism correction solar furnace sun tracking
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Vertical Upheaval Buckling of Submarine Buried Heated Pipelines with Initial Imperfection 被引量:2
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作者 王武刚 刘润 +1 位作者 闫澍旺 徐余 《Transactions of Tianjin University》 EI CAS 2011年第2期138-145,共8页
In this paper,a theoretical solution of vertical buckling is proposed with regard to the typical initial imperfection cases of submarine pipelines.Analytical tools are applied to predicting the occurrence and conseque... In this paper,a theoretical solution of vertical buckling is proposed with regard to the typical initial imperfection cases of submarine pipelines.Analytical tools are applied to predicting the occurrence and consequence of inservice buckling of a buried heated pipeline in Bohai Gulf.An evaluation is performed to ensure the pipeline structural integrity during operation under loading conditions.Different protection measures are proposed and their validities are analyzed.Analyses show that for the same magnitude of initial imperfection,the upheaval buckling of pipeline with isolated prop model is the most likely to occur.The empathetic model represents a special sub-case of continuous prop model,and the calculated buckle temperature is between the first stage and the second stage of post-upheaval buckling of continuous prop model.And the larger the initial imperfection,the less the axial force required for the upheaval buckling.Meanwhile,it can be seen that a peak point appears on the curves of temperature difference against buckling amplitude for small initial imperfection.Besides,trenching-burial is one kind of protection measures preventing the pipeline from thermal upheaval.The covered depth-to-diameter ratio depends on the design conditions and subsoil properties.For the given pipeline in this paper,the covered depth-to-diameter ratio is recommended to be 5. 展开更多
关键词 submarine buried pipeline thermal stress initial imperfection upheaval buckling protection measure
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Quantitative description of infrared radiation characteristics for solid materials subjected to external loading 被引量:2
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作者 王芳 李英骏 +1 位作者 饶秋华 唐炼 《Journal of Central South University》 SCIE EI CAS 2009年第6期1022-1027,共6页
Based on the thermodynamics theory and physical micro-properties of solid materials subjected to external loading at room temperature,a formula of calculating temperature difference of infrared radiation in terms of t... Based on the thermodynamics theory and physical micro-properties of solid materials subjected to external loading at room temperature,a formula of calculating temperature difference of infrared radiation in terms of the sum of three principal strains was deduced to quantitatively investigate the infrared radiation characteristics in test. Two typical specimens,the three-point bending beam and the disc pressed in diameter,were tested and their principal strains were calculated by finite element method in order to obtain the temperature differences of infrared radiation. Numerical results are in a good agreement with test results,which verifies the validity of the formula of calculating temperature differences of infrared radiation and the model of quantitatively describing the infrared radiation characteristics of solid materials,and reveals the corresponding inner physical mechanism. 展开更多
关键词 Infrared radiation characteristics thermodynamics analysis numerical simulation strain tensor
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Theoretical Analysis and Experimental Evidence of Non-Fourier Heat Conduction Behavior 被引量:2
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作者 蒋方明 刘登瀛 蔡睿贤 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2001年第4期359-366,共8页
This paper consists of two parts. (1) For a hollow sphere with sudden temperature changes on its inner and outer surfaces, the hyperbolic heat conduction equation is employed to describe this extreme thermal case and... This paper consists of two parts. (1) For a hollow sphere with sudden temperature changes on its inner and outer surfaces, the hyperbolic heat conduction equation is employed to describe this extreme thermal case and an analytical expression of its temperature distribution is obtained. According to the expression, the non-Fourier heat conduction behavior that will appear in the hollow sphere is studied and some qualitative conditions that will result in distinct non-Fourier behavior in the medium is ultimately attained. (2) A novel experiment to observe non-Fourier heat conduction behavior in porous material (mainly ordinary duplicating paper) heated by a microsecond laser pulse is presented. The conditions for observing distinct non-Fourier heat conduction behavior in the experimental sample agree well with the theoretical results qualitatively. 展开更多
关键词 non-Fourier heat conduction hyperbolic heat conduction thermal wave
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Thermal stability and Judd-Ofelt analysis of optical properties of Er^(3+)-doped tellurite glasses
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作者 任芳 梅宇钊 +2 位作者 高超 朱立刚 卢安贤 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第8期2021-2026,共6页
Er3+-doped TeO2-ZnO-Na2O-B2O3-GeO2 (TZNBG) glasses were prepared by melt-quenching method. Differential scanning calorimetry (DSC) and thermal mechanical analysis (TMA) were used to calculate thermal parameters... Er3+-doped TeO2-ZnO-Na2O-B2O3-GeO2 (TZNBG) glasses were prepared by melt-quenching method. Differential scanning calorimetry (DSC) and thermal mechanical analysis (TMA) were used to calculate thermal parameters: crystallization temperature (Tx), glass transition temperature (Tg) and thermal expansion (α). Besides, Judd-Ofelt theory is applied to analyzing absorption spectra. Intensity parameters -λ (λ=2, 4, 6), transition probabilities Aed, radiative lifetime τi, and branching ratios β of Er3+ transitions were obtained. Emission cross-section σemis of 4I13/2→4I15/2 transition of Er3+ was calculated according to the theory of McCumber. All of the parameters indicate that the thermal stability and optical properties of Er3+-doped TZNBG glasses are improved effectively. 展开更多
关键词 tellurite glasses thermal stability Judd-Ofelt theory spectroscopic properties
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Hidden Symmetries for Thermodynamics and Emergence of Relativity 被引量:1
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作者 赵柳 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第10期641-646,共6页
Erik Verlinde recently proposed an idea about the thermodynamic origin of gravity.Though this is abeautiful idea, which may resolve many long standing problems in the theories of gravity, it also raises many otherprob... Erik Verlinde recently proposed an idea about the thermodynamic origin of gravity.Though this is abeautiful idea, which may resolve many long standing problems in the theories of gravity, it also raises many otherproblems.In this article I will comment on some of the problems of Verlinde’s proposal with special emphasis on thethermodynamical origin of the principle of relativity.It is found that there is a large group of hidden symmetries ofthermodynamics, which contains the Poincare group of the spacetime for which space is emergent.This explains thethermodynamic origin of the principle of relativity. 展开更多
关键词 emergent gravity THERMODYNAMICS GEOMETRY principle of relativity
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