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Relationship between the Three Laws of Dialectics of Nature and Agricultural Development
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作者 Qianru ZHU 《Asian Agricultural Research》 2023年第7期20-21,共2页
Based on the three laws of dialectics of nature-the law of unity of opposites, the law of mutual change of quality and the law of negation of negation, this paper analyzes the relationship between the three laws and a... Based on the three laws of dialectics of nature-the law of unity of opposites, the law of mutual change of quality and the law of negation of negation, this paper analyzes the relationship between the three laws and agricultural development, and proposes making good use of the three laws to promote the better development of agriculture and realize agricultural modernization. 展开更多
关键词 dialectics of nature Law of unity of opposites Law of mutual change of quality Law of negation of negation Agricultural development
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Dialectical Thermodynamics’Solution to the Conceptual Imbroglio That Is the Reversible Path
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作者 José C. Íñiguez 《Journal of High Energy Physics, Gravitation and Cosmology》 CAS 2024年第2期775-799,共25页
According to the second law of thermodynamics, as currently understood, any given transit of a system along the reversible path proceeds with a total entropy change equal to zero. The fact that this condition is also ... According to the second law of thermodynamics, as currently understood, any given transit of a system along the reversible path proceeds with a total entropy change equal to zero. The fact that this condition is also the identifier of thermodynamic equilibrium, makes each and every point along the reversible path a state of equilibrium, and the reversible path, as expressed by a noted thermodynamic author, “a dense succession of equilibrium states”. The difficulties with these notions are plural. The fact, for example, that systems need to be forced out of equilibrium via the expenditure of work, would make any spontaneous reversible process a consumer of work, this in opposition to common thermodynamic wisdom that makes spontaneous reversible processes the most efficient transformers of work-producing-potential into actual work. The solution to this and other related impasses is provided by Dialectical Thermodynamics via its previously proved notion assigning a negative entropy change to the energy upgrading process represented by the transformation of heat into work. The said solution is here exemplified with the ideal-gas phase isomerization of butane into isobutane. 展开更多
关键词 Thermodynamic Reversibility Solution to Inconsistencies dialectical Thermodynamics
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Pragma-Dialectics:语用-辩证法,还是语用论辩学? 被引量:3
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作者 武宏志 《延安大学学报(社会科学版)》 2018年第2期32-41,共10页
荷兰Pragma-Dialectics学派的论辩理论在我国的影响越来越大。但是,对Pragma-Dialectics这个词本身的翻译发生了重大变化。Pragma-Dialectics最初传入我国时,被译作"语用-辩证法",后来出现了"语用论辩术(学)"的译... 荷兰Pragma-Dialectics学派的论辩理论在我国的影响越来越大。但是,对Pragma-Dialectics这个词本身的翻译发生了重大变化。Pragma-Dialectics最初传入我国时,被译作"语用-辩证法",后来出现了"语用论辩术(学)"的译法。两种译法孰优孰劣,关涉不少理论和历史问题,需要辨明。"语用论辩术(学)"的译法有诸多危险:不能保证相关术语翻译的一致性;抹煞了作为一种颇具特色的论辩理论——Pragma-Dialectics的一个突出特性;割裂了Dialectics的历史,忽视了Dialectics的各种表现形式。 展开更多
关键词 辩证法 语用-辩证法 论辩 论证 批判
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Estimating regional coal resource efficiency in China using three-stage DEA and bootstrap DEA models 被引量:10
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作者 Cui Yijia Huang Guoliang Yin Ziyong 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第5期861-864,共4页
Based on three-stage data envelopment analysis(DEA) model estimates of resource utilization efficiency of coal,we selected 29 provinces from China's 2012 input-output data and used the bootstrap DEA model to corre... Based on three-stage data envelopment analysis(DEA) model estimates of resource utilization efficiency of coal,we selected 29 provinces from China's 2012 input-output data and used the bootstrap DEA model to correct the bias.The results show that the mean overall technical efficiency,pure technical efficiency,and scale efficiency was 0.833,0.998,and 0.711 in 2012,respectively.Moreover,the comprehensive technical efficiency score indicates that the scale is invalid.Area utilization efficiencies for the eastern,central,and western regions were 0.917,0.731,and 0.629,respectively.The results prove that there are significant differences in the distribution of coal resources utilization efficiency across regions. 展开更多
关键词 Coal resource efficiency three-stage DEA Bootstrap DEA Technical efficiency
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Investigation on seismic response of a three-stage soil slope supported by anchor frame structure 被引量:5
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作者 LIN Yu-liang LI Ying-xin +1 位作者 ZHAO Lian-heng YANG T Y 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第4期1290-1305,共16页
Based on a typical prototype of a soil slope in engineering practice, a numerical model of a three-stage soil slope supported by the anchor frame structure was established by means of FLAC3D code. The dynamic response... Based on a typical prototype of a soil slope in engineering practice, a numerical model of a three-stage soil slope supported by the anchor frame structure was established by means of FLAC3D code. The dynamic responses of three-stage soil slope and frame structure were studied by performing a series of bidirectional Wenchuan motions in terms of the failure mode of three-stage structure, the acceleration of soil slope, the displacement of frame structure, and the anchor stress of frame structure. The response accelerations in both horizontal and vertical directions are the most largely amplified at the slope top of each stage subjected to different shaking cases. The platforms among the stages reduce the amplification effect of response acceleration. The residual displacement of frame structure increases significantly as the intensity of shaking case increases. The frame structure at each stage presents a combined displacement mode consisting of a translation and a rotation around the vertex. The anchor stress of frame structure is mainly increased by the first intense pulse of Wenchuan seismic wave, and it is sensitive to the intensity of shaking case. The anchor stress of frame structure at the first stage is the most considerably enlarged by earthquake loading. 展开更多
关键词 three-stage soil slope anchor frame structure ACCELERATION DISPLACEMENT anchor stress
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Production Efficiency of Two-Oriented Agriculture Based on Three-Stage DEA Model 被引量:10
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作者 ZHAI Huan-huan HE Zheng-chu ZHANG Rui 《Agricultural Science & Technology》 CAS 2010年第4期159-163,共5页
Two-oriented agriculture was a complex organism coupling production,economics,society and ecology.Its development process was affected by various factors such as producers,nature,society,etc.In order to overcome measu... Two-oriented agriculture was a complex organism coupling production,economics,society and ecology.Its development process was affected by various factors such as producers,nature,society,etc.In order to overcome measurement error of traditional data envelopment analysis caused by ignoring random,three-stage DEA model was studied to remove environmental factors and random effects.On the foundation of this model was two-oriented agriculture comprehensive production efficiency of 14 cities were estimated in Hunan Province in 2008,and brown forth corresponding policy proposals to promote agricultural development. 展开更多
关键词 Two-oriented agriculture three-stage DEA model Technical efficiency Scale efficiency
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An Analysis of Operational Efficiency of Agricultural Insurance Agency:Based on Three-Stage DEA Model 被引量:2
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作者 Xuan CHEN Wenhuan WEI 《Asian Agricultural Research》 2016年第12期12-16,共5页
From the perspective of agricultural insurance agency,this paper focuses on the study of operational efficiency of agricultural insurance agency,and analyzes the operational efficiency of agricultural insurance agency... From the perspective of agricultural insurance agency,this paper focuses on the study of operational efficiency of agricultural insurance agency,and analyzes the operational efficiency of agricultural insurance agency and its influencing factors,in order to improve the operational efficiency of agricultural insurance agency,better supply agricultural insurance and achieve the policy effect of agricultural insurance.The results of this paper are as follows:( i) Either comprehensive operational efficiency or scale efficiency of Chinese-funded agency is higher than that of foreign-funded agency,but its pure technical efficiency is lower than that of foreign-funded agency,indicating that the managerial decision ability of Chinese-funded agency is weaker than that of foreign-funded agency,and needs to be improved;( ii) The operational efficiency of professional agricultural insurance agency is higher than that of comprehensive agricultural insurance agency,and the agricultural insurance agency is greatly affected by environmental factors;( iii) The operating time of agricultural insurance agency is proportional to its operational efficiency;( iv) The quality of employees is positively correlated with the capital and cost input difference,but negatively correlated with the difference in the number of employees. Therefore,it is necessary to pay attention to the improvement of employees' working efficiency while laying emphasis on employees' quality. 展开更多
关键词 three-stage DEA Operational efficiency Influencing factors
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Contribution to the Optimization of the Transient Stability of an Electric Power Transmission Network Using a Universal Power Flow Compensator Controlled by a Three-Stage Inverter 被引量:2
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作者 Koko Koko Joseph Nneme Nneme Léandre Ndjakomo Essiane Salomé 《World Journal of Engineering and Technology》 2020年第4期675-688,共14页
The use of an electrical network as close as possible to its limits can lead to its instability in the event of a high amplitude disturbance. The damping of system oscillations can be achieved by conventional means of... The use of an electrical network as close as possible to its limits can lead to its instability in the event of a high amplitude disturbance. The damping of system oscillations can be achieved by conventional means of voltage and speed regulation but also by FACTS (Flexible AC Transmission Systems) devices, which are increasingly used in power networks. In this work, optimal control coordination between a hybrid power flow controller and a three-level inverter was used to improve the transient stability of a transmission line. The UPFC is a combination of a serial compensator (SSSC) and a parallel compensator (STATCOM) both connected to a DC-LINK DC bus. The SSSC acts as a voltage source for the network and injects a voltage that can be adjusted in phase and amplitude in addition to the network voltage;the STATCOM acts as a current source. The approach used is tested in the Matlab Simulink environment on a single machine network. Optimal controller tuning gives a better transient stability improvement by reducing the transport angle oscillations from 248.17% to 9.85%. 展开更多
关键词 FACTS UPFC three-stage Inverter PI Power Transit Transient Stability
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Improving Bandwidth of Three-Stage Electro-Hydraulic Servo Valve Based on Speed-Feedback 被引量:1
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作者 刘小初 何景峰 +2 位作者 叶正茂 丛大成 韩俊伟 《Journal of Donghua University(English Edition)》 EI CAS 2009年第5期494-498,共5页
In order to improve the dynamic response bandwidth of three-stage electro-hydraulic servo valve,a new method,speed-feedback control is presented in this paper.The construction and principle of three-stage electro-hydr... In order to improve the dynamic response bandwidth of three-stage electro-hydraulic servo valve,a new method,speed-feedback control is presented in this paper.The construction and principle of three-stage electro-hydraulic servo valve are explained,and the mathematical model of three-stage electro-hydraulic servo valve is built in frequency domain.Experimental and simulation results show that the bandwidth compared with proportional control is improved under speed-feedback control.Moreover,the research results play an important role in developing high performance three-stage electro-hydraulic servo valve. 展开更多
关键词 three-stage electro-hydraulic serw walve BANDWIDTH speed-feedback construction PRINCIPLE model simulation experimental test
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Numerical Simulation of Enhanced Oil-Water Separation in a Three-Stage Double-Stirring Extraction Tank 被引量:3
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作者 Lü Chao Zhang Zimu +3 位作者 Zhao Qiuyue Wang Shuchan Zhang Ting'an Liu Yan 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2015年第4期121-126,共6页
Numerical simulation of enhanced fluid flow characteristics in a three-stage double-stirring extraction tank was conducted with the coupling of an Eulerian multiphase flow model and a Morsi-Alexander interphase drag f... Numerical simulation of enhanced fluid flow characteristics in a three-stage double-stirring extraction tank was conducted with the coupling of an Eulerian multiphase flow model and a Morsi-Alexander interphase drag force model. Results show that the addition of a stirring device into the settler can efficiently reduce the volume fraction of out-of-phase impurity in the outlet, and accelerate the settling separation of oil-water mixture. Such addition can also effectively break down the oil-water-wrapped liquid droplets coming from the mixer, inhibit reflux from the outlet, and improve the oil-water separation. The addition of a stirring device induces ignorable power consumption compared with that by the mixer, and can thus facilitate the commercialized promotion of this novel equipment. 展开更多
关键词 three-stage extraction tank double-stirring numerical simulation flow characteristics power
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A Unique Orogenic System with Three-Stage Rapakivi Granites in the World:Proterozoic,Palaeozoic and Mesozoic Rapakivi Granites in the China Central Orogenic System 被引量:1
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作者 WANG Xiaoxia WANG Tao +2 位作者 LU Xinxiang HU Nenggao XIAO Qinghui 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2016年第5期1909-1910,共2页
Objective Rapakivi granites,characterized by rapakivi texture,Atype granite feature and an anorogenic setting,commonly occur in the Proterozoic of the Northern Hemisphere(Fig.la).Recently,more and more Phanerozoic r... Objective Rapakivi granites,characterized by rapakivi texture,Atype granite feature and an anorogenic setting,commonly occur in the Proterozoic of the Northern Hemisphere(Fig.la).Recently,more and more Phanerozoic rapakivi granite suites have been identified and some even occur in orogenic belts.Significantly,three-stage,Proterozoic. 展开更多
关键词 NCC A Unique Orogenic System with three-stage Rapakivi Granites in the World
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A Comparative Study on the Land Use Efficiency of Three Urban Agglomerations-Based on the Three-Stage DEA Model 被引量:1
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作者 Yang Lu 《Management Studies》 2021年第3期190-202,共13页
This paper uses a three-stage DEA model to measure the land use efficiency of the three major urban agglomerations in the Yangtze River Delta,Beijing-Tianjin-Hebei,and the Pearl River Delta from 2007 to 2018.The follo... This paper uses a three-stage DEA model to measure the land use efficiency of the three major urban agglomerations in the Yangtze River Delta,Beijing-Tianjin-Hebei,and the Pearl River Delta from 2007 to 2018.The following conclusions are drawn through research:first,the urban land use efficiency of the three major urban agglomerations in the Yangtze River Delta,Beijing-Tianjin-Hebei,and the Pearl River Delta all showed a downward trend,with the rates of decline being 6.06%,2.86%,and 24.34%respectively.In particular,the Pearl River Delta urban agglomeration had the largest decline.Second,the overall urban land use efficiency of the Beijing-Tianjin-Hebei urban agglomeration is relatively high,and the amount of redundancy is relatively small.The rate of decline is significantly lower than the urban land use efficiency of the two major urban agglomerations in the Yangtze River Delta and the Pearl River Delta.The land use efficiency of the Yangtze River Delta and Pearl River Delta urban agglomerations is in a state of continuous decline.Third,the proportion of cities with the effectiveness of returns to scale of urban land use efficiency in the three major urban agglomerations has decreased by 10.53%,10%,and 33.34%,respectively.The Pearl River Delta has the largest decline.Fourth,the land use efficiency of the Yangtze River Delta urban agglomeration is quite different.The central-peripheral phenomenon is evident for the Beijing-Tianjin-Hebei urban agglomerations and the Pearl River Delta urban agglomerations. 展开更多
关键词 three-stage DEA model three city groups land use efficiency
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Effects of standardized three-stage rehabilitation combined with edaravone therapy on the neurotrophic state and oxidative stress injury in patients with cerebral infarction 被引量:1
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作者 Xin-Qun Huang Xia Zhou 《Journal of Hainan Medical University》 2017年第24期130-133,共4页
Objective: To investigate the effects of standardized three-stage rehabilitation combined with edaravone therapy on the neurotrophic state and oxidative stress injury in patients with cerebral infarction. Methods: A t... Objective: To investigate the effects of standardized three-stage rehabilitation combined with edaravone therapy on the neurotrophic state and oxidative stress injury in patients with cerebral infarction. Methods: A total of 90 patients with acute cerebral infarction who were treated in the hospital between May 2015 and April 2017 were divided into control group (n=45) and observation group (n=45) by random number table. Control group received edaravone therapy, and observation group received standardized three-stage rehabilitation combined with edaravone therapy. The differences in neurotrophic state and oxidative stress injury were compared between the two groups before and after treatment. Results: There was no statistically significant difference in serum levels of neurotrophic indexes and oxidative stress indexes between the two groups before treatment. After treatment, serum neurotrophic indexes BDNF and NGF levels of observation group were higher than those of control group;serum oxidation indexes AOPPs, LHP and MDA levels were lower than those of control group whereas SOD, CAT and T-AOC levels were higher than those of control group. Conclusion:Standardized three-stage rehabilitation combined with edaravone therapy can effectively optimize the neurotrophic state and inhibit the oxidative stress in patients with cerebral infarction. 展开更多
关键词 CEREBRAL INFARCTION Standardized three-stage REHABILITATION EDARAVONE NEUROTROPHIC state Oxidative stress injury
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A Three-section Algorithm of Dynamic Programming Based on Three-stage Decomposition System Model for Grade Transition Trajectory Optimization Problems
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作者 魏宇杰 江永亨 黄德先 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第10期1122-1130,共9页
This paper introduces a practical solving scheme of gradetransition trajectory optimization(GTTO) problems under typical certificate-checking–updating framework. Due to complicated kinetics of polymerization,differen... This paper introduces a practical solving scheme of gradetransition trajectory optimization(GTTO) problems under typical certificate-checking–updating framework. Due to complicated kinetics of polymerization,differential/algebraic equations(DAEs) always cause great computational burden and system non-linearity usually makes GTTO non-convex bearing multiple optima. Therefore, coupled with the three-stage decomposition model, a three-section algorithm of dynamic programming(TSDP) is proposed based on the general iteration mechanism of iterative programming(IDP) and incorporated with adaptivegrid allocation scheme and heuristic modifications. The algorithm iteratively performs dynamic programming with heuristic modifications under constant calculation loads and adaptively allocates the valued computational resources to the regions that can further improve the optimality under the guidance of local error estimates. TSDP is finally compared with IDP and interior point method(IP) to verify its efficiency of computation. 展开更多
关键词 Gradetransition TRAJECTORY optimization Adaptivegrid ALLOCATION HEURISTIC modifications Three-section dynamic programming three-stage DECOMPOSITION model
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A CENTRAL-STAGE BUFFERED THREE-STAGE CLOS SWITCHING FABRIC AND THE SCHEDULING ALGORITHM
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作者 Hu Yuxiang Ma Xiangjie Lan Julong Wang Haoxue 《Journal of Electronics(China)》 2009年第1期113-119,共7页
Current MSM switching fabric has poor performance under unbalanced traffic. This paper presents an alternative, novel Central-stage Buffered Three-stage Clos switching (CB-3Clos) fabric and proves that this fabric can... Current MSM switching fabric has poor performance under unbalanced traffic. This paper presents an alternative, novel Central-stage Buffered Three-stage Clos switching (CB-3Clos) fabric and proves that this fabric can emulate output queuing switch without any speedup. By analyzing the condition to satisfy the central-stage load-balance, this paper also proposes a Central-stage Load-balanced-based Distributed Scheduling algorithm (CLDS) for CB-3Clos. The results show that, compared with Concurrent Round-Robin based Dispatching (CRRD) algorithm based on MSM, CLDS algorithm has high throughput irrespective with the traffic model and better performance in mean packet delay. 展开更多
关键词 three-stage Clos switching fabric Central-stage buffered Distributed scheduling Loadbalance
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Two-Stage Inspection Model Based on a Three-Stage Failure Process
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作者 杨瑞锋 康建设 王广彦 《Journal of Donghua University(English Edition)》 EI CAS 2016年第2期215-218,共4页
As the non-periodic inspections are common in practice,a two-stage inspection model based on a three-stage failure process is proposed. The two-stage inspection means that the system is inspected with the first inspec... As the non-periodic inspections are common in practice,a two-stage inspection model based on a three-stage failure process is proposed. The two-stage inspection means that the system is inspected with the first inspection interval T_1 and the second inspection interval T_2. Because of the three color schemes commonly used in industry,three stages are divided by the system lifetime:normal, minor defective and severe defective stages. Upon the failure of the system,replacement is carried out. Maintenance is done once identifying the severe defective stage. However,when the minor defective stage is identified by the second inspection interval T_2,action of halving the subsequent inspection interval is adopted.Otherwise,no action is required. Our objective function is to optimize the inspection intervals so as to minimize the expected cost per unit time. Finally,a numerical example is presented to illustrate the effectiveness of the proposed model. 展开更多
关键词 delay time two-stage inspection three-stage failure process preventive maintenance(PM)
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Kosik's Dialectics of Concrete Totality
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作者 Denko Skalovski 《Journal of Philosophy Study》 2015年第6期273-281,共9页
Setting out from the categories of totality and histori(ci)sm in Kosik's Dialectics of the Concrete, we look at the relationship between theory and praxis: empty, abstract totality versus concrete, reified and ali... Setting out from the categories of totality and histori(ci)sm in Kosik's Dialectics of the Concrete, we look at the relationship between theory and praxis: empty, abstract totality versus concrete, reified and alienated practice (Lukacs, Habermas, Honneth); a bad totality, in which the real polydimensional subject is replaced by the one-dimensional, mythologized, fetishized, and economistically reduced "subject" of consummation (Marcuse, Baudrillard). The dialectics of concrete totality implies a marxistic critique of the ethical and juristic universalism, in the context of the "positive" side of globalization and political unilateralism, as a concrete, militant, hegemonistic, post-colonial, and neo-imperial practice (Apel, Habermas, Chomsky, Zinoviev); globalization as totali(tari)zation, the "last man," the "end of history," and the "end" of dialectics in its neo-liberal, eschatological, empty ideological "realization" (Hegel, Marx, Fukuyama, Arendt); the totality of the (invariable) being as a pseudo-concrete and pseudo-dialectical ontologistic speculation (Heidegger): A "return" to a concrete history and a return of the "positive" dialectics as a critical awareness, mind, and method in the discourse "game" of human's cognitive, creative, and practical powers. The assumption of Kosik's humanism is a synchrony of nature and history in the "absolute" totality of human's concrete existence (Lukacs, Goldmann, Adorno, Sartre, Kosik). 展开更多
关键词 TOTALITY history nature dialectics CONCRETE GLOBALIZATION MORAL REIFICATION
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How to Make a Story Beautiful: On Aesthetic Dialectics of Liao zhai zhi yi
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作者 LI Hong-xiang 《Journal of Literature and Art Studies》 2016年第6期695-707,共13页
How to write a beautiful story? It is an important question to Chinese writers because novel has not been regarded as a formal genre until late Qing Dynasty. Pu Songling answers this question with his work Liao zhai ... How to write a beautiful story? It is an important question to Chinese writers because novel has not been regarded as a formal genre until late Qing Dynasty. Pu Songling answers this question with his work Liao zhai zhi yi (Strange tales from a Chinese studio). This paper aims to study his narrative arts. There are four sections included. In part 1, this paper introduces a definition of the aesthetic dialectics and its embodiment in Chinese classical literary theory; in part 2, this paper takes the Liao zhai story as example to interpret Pu Songling's dialectic relation between description and narration; in part 3, I will show how Liao zhai presents beauty by unexpected but reasonable changes; and in last part, I give more importance to the stories concerning ordinary things for the reason that Pu Songling could make them interesting and beautiful. In the end, the paper concludes that Pu Songling is successful storyteller by using dialectic arts, which should be learned by Chinese writers. 展开更多
关键词 Liao zhai BEAUTY change aesthetic dialectics NARRATION
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Five Dialectics of Xi Jinping's Theory on Ecological Progress
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作者 Chen Wenbin Guo Yan +1 位作者 Zhang Congrong Lin Min 《Contemporary Social Sciences》 2018年第2期47-55,共9页
Xi Jinping's theory on ecological progress expands and deepens Marx's views on ecology and spells out the five dialectics between economic development and ecological conservation, the will of the nation and th... Xi Jinping's theory on ecological progress expands and deepens Marx's views on ecology and spells out the five dialectics between economic development and ecological conservation, the will of the nation and the will of the people, Chinese characteristics and global approaches, cultural concepts and institutional design, as well as the community of life and the community of shared future for mankind. It carries significance for our time and is weighted with theoretical value. At this stage, learning and studying the dialectics and value orientation of Xi Jinping's theory on ecological progress offers scientific guidance and value-based directions for China's efforts to promote an ecological civilization. 展开更多
关键词 Xi Jinping theory on ecological progress Marx’s views on ecology dialectics
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Calculation of Agricultural Production Efficiency Based on a Three-stage Data Envelopment Analysis Model and Analysis of the Spatial-temporal Characteristics: A Case Study of the Yangtze River Economic Belt
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作者 Wenjun ZHUO Haiyang CUI 《Meteorological and Environmental Research》 CAS 2021年第5期68-76,83,共10页
In response to the strategic call for the " Great Protection" of the Yangtze River Economic Belt and to fulfill the important historical tasks assigned by the state to the provinces and cities of the area,th... In response to the strategic call for the " Great Protection" of the Yangtze River Economic Belt and to fulfill the important historical tasks assigned by the state to the provinces and cities of the area,the Yangtze River Economic Belt is adjusting the agricultural industry structure,optimizing the input-output ratio,and ensuring stable and sustainable agricultural production. Based on the combination of the three-stage Data Envelopment Analysis( DEA) model and cluster analysis,this study examined the Yangtze River Economic Belt from 2008 to 2018 to measure its agricultural production efficiency and to analyze its temporal and spatial characteristics. Studies showed that exogenous environmental factors significantly( P < 5%) impacted agricultural production efficiency in the Yangtze River Economic Zone,and there were temporal and spatial differences. These included:(1) after excluding environmental factors,the overall agricultural production efficiency of the Yangtze River Economic Zone had improved. Sichuan Province and Jiangsu Province were at the forefront of efficiency,whereas the agricultural production efficiency of Shanghai had declined obviously.(2) The agricultural production efficiency of the Yangtze River Economic Belt varied year by year,with fluctuating development. The middle reaches of the Yangtze River had advanced agricultural production efficiency more than the upstream and downstream regions,and the agricultural production efficiency of the individual provinces did not match their economic and social development.(3) Increases in labor,land,irrigation,and other input factors increased agriculture production efficiency,and there was no correlation between fiscal investment,per capita gross domestic product( GDP) and agricultural production efficiency,while the disaster-affected area had a significantly negative impact on agricultural production efficiency. 展开更多
关键词 Agricultural production efficiency three-stage Date Envelopment Analysis Temporal and spatial characteristics Yangtze River Economic Belt
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