To relieve the increasing traffic load, many early built highways need to be widened or reconstructed. The rapid performance detection to existing subgrades is important to their reasonable evaluation and maximized ut...To relieve the increasing traffic load, many early built highways need to be widened or reconstructed. The rapid performance detection to existing subgrades is important to their reasonable evaluation and maximized utilization. Based on five kinds of soils taken from an existing highway in southern China, three commonly detecting methods were used to determine their moisture contents, compaction degrees and resilient moduli. The results showed that the measured moisture contents were greater than the design value, and the compaction degrees decreased sharply compared to the original ones. The moisture and heat exchange produced a decrease in the resilient modulus of plate loading test(PLT) from the standard 60 MPa down to 40 MPa. Afterwards, the portable falling weight deflectometer(PFWD) and dynamic cone penetrometer(DCP) were used to evaluate the subgrade performances. The measured PFWD moduli and the DCP penetration rates were correlated with the resilient moduli of PLT, deflections of the Beckman beam test, compaction degrees and moisture contents. The correlation analysis indicates that both of two methods are suitable in rapid detecting subgrade performances, but PFWD method is more recommended for it has higher accuracy and efficiency.展开更多
In order to investigate the existing form and action mechanism of minor scandium （Sc） and zirconium （Zr） in AI-Cu-Mg alloy, microstructures of Al-4Cu-1Mg-Sc-Zr alloy under different conditions, including states of...In order to investigate the existing form and action mechanism of minor scandium （Sc） and zirconium （Zr） in AI-Cu-Mg alloy, microstructures of Al-4Cu-1Mg-Sc-Zr alloy under different conditions, including states of as-cast, homogenized, hot-rolled, as-solution and natural aged, were observed by scanning electron microscopy （SEM）, X-ray diffractometry （XRD） and transmission electron microscopy （TEM）. It is revealed that Sc and Zr are completely dissolved into the supersaturated solid solution in as-cast ingot, but grain refinement is not observed. Coffee-bean-like AI3（Sc, Zr） particles deposit during homogenization of ingot induce an increase in hardness. Al3（Sc, Zr） particles are slightly coarsened in as-solution samples, but they still maintain coherent to matrix, which indicates a high thermal stability of these particles. Good coherency ofAl3（Sc, Zr） particles makes some benefits for inhibiting recrystallization and reserving work-hardening.展开更多
Chloride-induced corrosion of the reinforcement is considered as one of the major mechanisms resulting in the reduction of structural resistance of reinforced concrete structural elements located in marine and other a...Chloride-induced corrosion of the reinforcement is considered as one of the major mechanisms resulting in the reduction of structural resistance of reinforced concrete structural elements located in marine and other aggressive environments. A study of reinforced concrete structures located at the Fangcheng dock in the Beibu Gulf port, China, was present. The result from field survey indicates that the concrete cover depth and chloride diffusion coefficient fit best normal distribution and lognormal distribution, respectively. The service life of structure is about 55 a, while initiation time is 45 a. Sensitivity analysis indicates that the most influential factor of the structure service life prediction is concrete cover, followed by diffusion coefficient, diffusion decay index, critical chloride concentration, surface chloride concentration, current density and localized pitting corrosion. Finally, the effects of diffusion decay index and critical chloride concentration on structure service life prediction are discussed.展开更多
"being"是由"Sis"(如Godis)这样的句式衍变而来,是系词"tobe"的现在分词形式或动名词形式,它的最基本、最核心的涵义就是"有"、"存有"(there-is)或"存在"(existence),由..."being"是由"Sis"(如Godis)这样的句式衍变而来,是系词"tobe"的现在分词形式或动名词形式,它的最基本、最核心的涵义就是"有"、"存有"(there-is)或"存在"(existence),由此派生出西方哲学史上关于"being"或"existence"是不是一个命题的逻辑谓词的长期论战。如果让"existence"(存在)不带时空含义、不具"现实性"意涵,则"存有"就是"存在","being"即"existence"。相反,如果让"existence"(存在)带上时空含义、具有"现实性"意涵,则"存有"不等于"存在","being"不等于"existence"。此外,"being"还与"实体"(sub-stance)、"本质"(essence)和"真理"(truth)有密切关联。"存有"、"实体"和"本质"都是把一个事物的一切具体特性P、Q、R、T等等抽象掉之后所留存下来的载体或基质,是决定一个事物之所是(what it is)或自身同一性的东西,是作为"存有物之存有"(beings qua being)。因此,国内哲学界先前把"being"译为"存在"或"存有"是有根据的,并无大错。"从古至今,一‘是’到底"的理解、诠释、翻译西方哲学的路径或策略,在理论上没有充分的根据,在汉语哲学实践中也行不通,因为它会造成许多完全无法理解的汉语句子,如把"是是是,不是不是"作为对"Being is being,not non-being"的汉译。展开更多
托马斯.阿奎那的形而上学是以是(being)为中心、以本质(essence)和存在(existence)的关系学说为枢纽的存在论。阿奎那认为,形而上学或存在论所探讨的特殊的固有对象即是是(to on,esse,being)自身,或者称之为是之所以为是(esse in quantu...托马斯.阿奎那的形而上学是以是(being)为中心、以本质(essence)和存在(existence)的关系学说为枢纽的存在论。阿奎那认为,形而上学或存在论所探讨的特殊的固有对象即是是(to on,esse,being)自身,或者称之为是之所以为是(esse in quantum esse,being as beinginjeneral)。他在论证是自身时强调实在意义上的是重于逻辑意义的是。是(being)包括本质(essence)与存在(existence);本质(essence)与存在(existence)皆为是者(beings)。而存在(existence)先于本质(essence);存在(existence)是是(being)之最具体的、个别的、实体的、独一无二的完美实现(act)。托马斯.阿奎那的存在论哲学颠覆了传统哲学中存在与本质的位置,它以一种存在主义代替本质主义,从而在形而上学历史上掀起一场革命。展开更多
Existentialism is a philosophy that emphasizes the uniqueness and isolation of the individual experience.Its basic concern is human existence.It advocates human freedom and individuality.It is of great significance to...Existentialism is a philosophy that emphasizes the uniqueness and isolation of the individual experience.Its basic concern is human existence.It advocates human freedom and individuality.It is of great significance to study existentialism from different perspectives.展开更多
针对诺西肽发酵过程中菌体质量浓度的估计问题,提出了一种基于RBF神经网络的软测量建模方法.在诺西肽发酵过程非结构模型的基础上,根据隐函数存在定理确定出辅助变量,从而使其选择有严格的理论依据;根据每批样本数据对被预测对象的预估...针对诺西肽发酵过程中菌体质量浓度的估计问题,提出了一种基于RBF神经网络的软测量建模方法.在诺西肽发酵过程非结构模型的基础上,根据隐函数存在定理确定出辅助变量,从而使其选择有严格的理论依据;根据每批样本数据对被预测对象的预估能力,自适应地为各个批次的训练样本分配权值,并进而实施加权RBF神经网络建模.实际应用表明,所提出的软测量建模方法是有效的.
Abstract：
A RBF neural network based soft sensor method is presented for the estimation of biomass in Nnsiheptide fermentation process. Based on the unstructured model of Nosiheptide fermentation process, the secondary variables are selected according to the implicit function existence theorem, which makes the selection be strict in theory. Each batch training samples are self-adaptively weighted according to their different predicting ability to the predicted object, and then weighted RBF neural network (WRBFNN) is applied to develop the biomass soft sensor modeL The testing result shows that the presented method is effective.展开更多
This paper addresses the existence detection of blanket jamming based on fractal features in fractional Fourier transform (FRET) domain. Firstly, the existences of fractal features of three typical jamming signals are...This paper addresses the existence detection of blanket jamming based on fractal features in fractional Fourier transform (FRET) domain. Firstly, the existences of fractal features of three typical jamming signals are analyzed, and box dimension and information dimension are employed to describe fractal features quantitatively. Then the differences of fractal characteristics between blanket jamming and white Gaussian noise (WGN) in FRFT domain are described, and a detector to detect the jamming is proposed. At last, simulations are done to verify that the algorithm is effective preferable.展开更多
Since the 1970s, Water Environment Monitoring Center of Yangtze valley has been carrying out the monitoring and research work on deposit material in the main stream of Yangtze and finished significant monitoring and r...Since the 1970s, Water Environment Monitoring Center of Yangtze valley has been carrying out the monitoring and research work on deposit material in the main stream of Yangtze and finished significant monitoring and research work on the deposit materials in river sections of urban districts for 21 main cities, such as Panzhihua, Chongqing, Wuhan, Shanghai etc. Based on the monitoring and research results, this paper describes the basic characteristics of deposit materials, the content, distribution and existing state, transfer and transformation characteristics of heavy metal pollutants. The results demonstrate that the heavy metal content in suspended load is higher than that in deposited material for main stream of the Yangtze, the alongshore water zone has been polluted in different degree. Among the 21 main cities on the Yangtze river, the river water pollution along the six cities,i.e. Panzhihua, Yichang, Nanjing, Wuhan, Shanghai, Chongqing, is more serious.展开更多
This paper discusses a class of high index nonlinear singular systems with delay andobtains some results of existence and uniqueness of solution of their initial value problems. Andthese results are suitable for index...This paper discusses a class of high index nonlinear singular systems with delay andobtains some results of existence and uniqueness of solution of their initial value problems. Andthese results are suitable for index-1 singular systems with delay.展开更多
The qualitative behavior of solutions for a generalized Gause type predator prey system was studied.A large number of biological and bioeconomic models are special cases of this system.The system was investigated in t...The qualitative behavior of solutions for a generalized Gause type predator prey system was studied.A large number of biological and bioeconomic models are special cases of this system.The system was investigated in the region D={(x,y)|x>0,y>0} because of the biological meaning of the system.The authors derived some sufficient conditions for the boundedness of the solutions and the existence of limit cycles of the system,which ensure that the system has at least one limit cycle.The theory of limit sets of autonomous plane systems and the theorem of cycle field of Poincare Bendixson are efficiently employed in the research.The main results and their consequences presented not only generalize some known results,but also improve some corresponding results of other authors.展开更多
Based on a variety of geometric observations for location of solutions, a general and unified region analysis framework for developing constructive solvability of nonlinear operator equations are proposed. Within this...Based on a variety of geometric observations for location of solutions, a general and unified region analysis framework for developing constructive solvability of nonlinear operator equations are proposed. Within this framework, the methods including interval, ball and ellipsoid methods can be studied in a unified way. The ball algorithm, as a typical example, is in particular analysed.展开更多
基金Project(2017YFC0805307) supported by the National Key Research and Development Program of ChinaProjects(51878078, 51927814, 51911530215) supported by the National Natural Science Foundation of China+4 种基金Project(2018-025) supported by the Training Program for High-level Technical Personnel in Transportation Industry, ChinaProject (2018JJ1026) supported by the Excellent Youth Foundation of Natural Science Foundation of Hunan Province, ChinaProject(17A008) supported by the Key Project of Education Department of Hunan Province, ChinaProjects(kfj150103, kfj170104) supported by the Open Research Fund of State Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, ChinaProject(CX20190644) supported by the Postgraduate Scientific Research Innovation Project of Hunan Province, China。
文摘To relieve the increasing traffic load, many early built highways need to be widened or reconstructed. The rapid performance detection to existing subgrades is important to their reasonable evaluation and maximized utilization. Based on five kinds of soils taken from an existing highway in southern China, three commonly detecting methods were used to determine their moisture contents, compaction degrees and resilient moduli. The results showed that the measured moisture contents were greater than the design value, and the compaction degrees decreased sharply compared to the original ones. The moisture and heat exchange produced a decrease in the resilient modulus of plate loading test(PLT) from the standard 60 MPa down to 40 MPa. Afterwards, the portable falling weight deflectometer(PFWD) and dynamic cone penetrometer(DCP) were used to evaluate the subgrade performances. The measured PFWD moduli and the DCP penetration rates were correlated with the resilient moduli of PLT, deflections of the Beckman beam test, compaction degrees and moisture contents. The correlation analysis indicates that both of two methods are suitable in rapid detecting subgrade performances, but PFWD method is more recommended for it has higher accuracy and efficiency.
基金Project(2005DFA50550) supported by International Science and Technology Cooperation Program of ChinaProject(2005CB623705) supported by the National Basic Research Program of China
文摘In order to investigate the existing form and action mechanism of minor scandium （Sc） and zirconium （Zr） in AI-Cu-Mg alloy, microstructures of Al-4Cu-1Mg-Sc-Zr alloy under different conditions, including states of as-cast, homogenized, hot-rolled, as-solution and natural aged, were observed by scanning electron microscopy （SEM）, X-ray diffractometry （XRD） and transmission electron microscopy （TEM）. It is revealed that Sc and Zr are completely dissolved into the supersaturated solid solution in as-cast ingot, but grain refinement is not observed. Coffee-bean-like AI3（Sc, Zr） particles deposit during homogenization of ingot induce an increase in hardness. Al3（Sc, Zr） particles are slightly coarsened in as-solution samples, but they still maintain coherent to matrix, which indicates a high thermal stability of these particles. Good coherency ofAl3（Sc, Zr） particles makes some benefits for inhibiting recrystallization and reserving work-hardening.
基金Project(41274012) supported by the National Natural Science Foundation of China
文摘Chloride-induced corrosion of the reinforcement is considered as one of the major mechanisms resulting in the reduction of structural resistance of reinforced concrete structural elements located in marine and other aggressive environments. A study of reinforced concrete structures located at the Fangcheng dock in the Beibu Gulf port, China, was present. The result from field survey indicates that the concrete cover depth and chloride diffusion coefficient fit best normal distribution and lognormal distribution, respectively. The service life of structure is about 55 a, while initiation time is 45 a. Sensitivity analysis indicates that the most influential factor of the structure service life prediction is concrete cover, followed by diffusion coefficient, diffusion decay index, critical chloride concentration, surface chloride concentration, current density and localized pitting corrosion. Finally, the effects of diffusion decay index and critical chloride concentration on structure service life prediction are discussed.
文摘"being"是由"Sis"(如Godis)这样的句式衍变而来,是系词"tobe"的现在分词形式或动名词形式,它的最基本、最核心的涵义就是"有"、"存有"(there-is)或"存在"(existence),由此派生出西方哲学史上关于"being"或"existence"是不是一个命题的逻辑谓词的长期论战。如果让"existence"(存在)不带时空含义、不具"现实性"意涵,则"存有"就是"存在","being"即"existence"。相反,如果让"existence"(存在)带上时空含义、具有"现实性"意涵,则"存有"不等于"存在","being"不等于"existence"。此外,"being"还与"实体"(sub-stance)、"本质"(essence)和"真理"(truth)有密切关联。"存有"、"实体"和"本质"都是把一个事物的一切具体特性P、Q、R、T等等抽象掉之后所留存下来的载体或基质,是决定一个事物之所是(what it is)或自身同一性的东西,是作为"存有物之存有"(beings qua being)。因此,国内哲学界先前把"being"译为"存在"或"存有"是有根据的,并无大错。"从古至今,一‘是’到底"的理解、诠释、翻译西方哲学的路径或策略,在理论上没有充分的根据,在汉语哲学实践中也行不通,因为它会造成许多完全无法理解的汉语句子,如把"是是是,不是不是"作为对"Being is being,not non-being"的汉译。
文摘托马斯.阿奎那的形而上学是以是(being)为中心、以本质(essence)和存在(existence)的关系学说为枢纽的存在论。阿奎那认为,形而上学或存在论所探讨的特殊的固有对象即是是(to on,esse,being)自身,或者称之为是之所以为是(esse in quantum esse,being as beinginjeneral)。他在论证是自身时强调实在意义上的是重于逻辑意义的是。是(being)包括本质(essence)与存在(existence);本质(essence)与存在(existence)皆为是者(beings)。而存在(existence)先于本质(essence);存在(existence)是是(being)之最具体的、个别的、实体的、独一无二的完美实现(act)。托马斯.阿奎那的存在论哲学颠覆了传统哲学中存在与本质的位置,它以一种存在主义代替本质主义,从而在形而上学历史上掀起一场革命。
文摘Existentialism is a philosophy that emphasizes the uniqueness and isolation of the individual experience.Its basic concern is human existence.It advocates human freedom and individuality.It is of great significance to study existentialism from different perspectives.
文摘针对诺西肽发酵过程中菌体质量浓度的估计问题,提出了一种基于RBF神经网络的软测量建模方法.在诺西肽发酵过程非结构模型的基础上,根据隐函数存在定理确定出辅助变量,从而使其选择有严格的理论依据;根据每批样本数据对被预测对象的预估能力,自适应地为各个批次的训练样本分配权值,并进而实施加权RBF神经网络建模.实际应用表明,所提出的软测量建模方法是有效的.
Abstract：
A RBF neural network based soft sensor method is presented for the estimation of biomass in Nnsiheptide fermentation process. Based on the unstructured model of Nosiheptide fermentation process, the secondary variables are selected according to the implicit function existence theorem, which makes the selection be strict in theory. Each batch training samples are self-adaptively weighted according to their different predicting ability to the predicted object, and then weighted RBF neural network (WRBFNN) is applied to develop the biomass soft sensor modeL The testing result shows that the presented method is effective.
基金supported by Key Laboratory of Science and Technology in Complex Electromagnetic Environment(201E-05-1)
文摘This paper addresses the existence detection of blanket jamming based on fractal features in fractional Fourier transform (FRET) domain. Firstly, the existences of fractal features of three typical jamming signals are analyzed, and box dimension and information dimension are employed to describe fractal features quantitatively. Then the differences of fractal characteristics between blanket jamming and white Gaussian noise (WGN) in FRFT domain are described, and a detector to detect the jamming is proposed. At last, simulations are done to verify that the algorithm is effective preferable.
文摘Since the 1970s, Water Environment Monitoring Center of Yangtze valley has been carrying out the monitoring and research work on deposit material in the main stream of Yangtze and finished significant monitoring and research work on the deposit materials in river sections of urban districts for 21 main cities, such as Panzhihua, Chongqing, Wuhan, Shanghai etc. Based on the monitoring and research results, this paper describes the basic characteristics of deposit materials, the content, distribution and existing state, transfer and transformation characteristics of heavy metal pollutants. The results demonstrate that the heavy metal content in suspended load is higher than that in deposited material for main stream of the Yangtze, the alongshore water zone has been polluted in different degree. Among the 21 main cities on the Yangtze river, the river water pollution along the six cities,i.e. Panzhihua, Yichang, Nanjing, Wuhan, Shanghai, Chongqing, is more serious.
文摘This paper discusses a class of high index nonlinear singular systems with delay andobtains some results of existence and uniqueness of solution of their initial value problems. Andthese results are suitable for index-1 singular systems with delay.
文摘The qualitative behavior of solutions for a generalized Gause type predator prey system was studied.A large number of biological and bioeconomic models are special cases of this system.The system was investigated in the region D={(x,y)|x>0,y>0} because of the biological meaning of the system.The authors derived some sufficient conditions for the boundedness of the solutions and the existence of limit cycles of the system,which ensure that the system has at least one limit cycle.The theory of limit sets of autonomous plane systems and the theorem of cycle field of Poincare Bendixson are efficiently employed in the research.The main results and their consequences presented not only generalize some known results,but also improve some corresponding results of other authors.
文摘Based on a variety of geometric observations for location of solutions, a general and unified region analysis framework for developing constructive solvability of nonlinear operator equations are proposed. Within this framework, the methods including interval, ball and ellipsoid methods can be studied in a unified way. The ball algorithm, as a typical example, is in particular analysed.
