The coastal area of southern China is frequently affected by marine meteorological disasters,and is also one of the key areas that influence the short-term climate change of China.Due to a lack of observational facili...The coastal area of southern China is frequently affected by marine meteorological disasters,and is also one of the key areas that influence the short-term climate change of China.Due to a lack of observational facilities and techniques,little has been done in this area in terms of operational weather monitoring and scientific research on atmospheric and marine environment.With the support of China Meteorological Administration (CMA) and Guangdong Meteorological Bureau (GMB),the Marine Meteorological Science Experiment Base (MMSEB) at Bohe,Maoming has been jointly established by Guangzhou Institute of Tropical and Marine Meteorology (GITMM) and Maoming Meteorological Bureau (MMB) of Guangdong Province after three years of hard work.It has become an integrated coastal observation base that is equipped with a complete set of sophisticated instruments.Equipment maintenance and data quality control procedures have been implemented to ensure the long-term,steady operation of the instruments and the availability of high quality data.Preliminary observations show that the data obtained by the MMSEB reveal many interesting features in the boundary layer structure and air-sea interaction in such disastrous weather as typhoons and sea fog.The MMSEB is expected to play an important role in the scientific research of disastrous weather related to marine meteorology.展开更多
A complex longitudinal magnetoresistance (MR//) effect in the non-stoichiometric silver chaJcogenides (include the silver selenide and telluride) has been found, however the mechanism for the MR// effect is not cl...A complex longitudinal magnetoresistance (MR//) effect in the non-stoichiometric silver chaJcogenides (include the silver selenide and telluride) has been found, however the mechanism for the MR// effect is not clear now. In this work, a new random resistor network for MR// effect is proposed based on the experimental observation. The network is constructed from six-terminal resistor units and the mobility of carries within the network has a Gaussian distribution. Considering the non-zero transverse-longitudinal coupling in materials, the resistance matrix of the six- terminal resistor unit is modified. It is found that the material has the "chiral" transverse-longitudinal couplings, which is suggested a main reason for the complex MR//effect. The model predictions are compared with the experimental results. A three dimension (3D) visualization of current flow within the network demonstrates the "current jets" phenomenon in the thickness of materials dearly.展开更多
In this paper we propose to discuss the issue of subjectivity versus objectivity teaching practice of foreign language, especially English, in Brazil. Starting from the short story "The Parrot and Descartes" by Paul...In this paper we propose to discuss the issue of subjectivity versus objectivity teaching practice of foreign language, especially English, in Brazil. Starting from the short story "The Parrot and Descartes" by Pauline Melville, we argue that Cartesianism has influenced a view on education which tends to consider good and valuable what is "scientific", "objective" and "universal". The subjective and the local seem to be considered undesirable and unreliable. Brazilian scholars on the education field, such as Coracini and Souza are important support for our argument.展开更多
The mechanical properties of outwash deposits which are taken as unconsolidated geo-materials with the characteristics of non-uniformity, heterogeneity and multiphase have attracted much attention in engineering. Acco...The mechanical properties of outwash deposits which are taken as unconsolidated geo-materials with the characteristics of non-uniformity, heterogeneity and multiphase have attracted much attention in engineering. According to the results of laboratory direct shear test on the remolded samples, the soil particle parameters of numerical model based on in-situ particle size cumulative curves and 3D granular discrete element method were determined. Then, numerical experiments on different lithology, stone content and gradation composition were conducted. The results show that it is not a flat surface but a shear band that yields in the sample. The curve of particle velocity vs distance from the designed shear surface of test model that is taken as a datum plane in the vertical section of sample shows in "S" shape. The shear disturbance area is about twice the maximum diameter of stone blocks. The greater the stiffness of stone is, the rougher the shear surface is. The shear strength of outwash deposits is largely controlled by lithology and stone content, and the bite force between stone blocks is the root reason of larger friction angle. It is also shown that strain hardening and low shear dilatancy occur under high confining pressure as well as possibility of shear shrinkage. But it is easy to behave shear dilatation and strain softening under low confining pressure. The relationship between particle frictional coefficient and stone content presents an approximately quadratic parabola increase. The strain energy first increases and then drops with the increase of frictional energy. The cohesion increases with soil stiffness increasing but decreases with stone stiffness increasing. Numerical results are consistent with the laboratory test results of remolded samples, which indicate that this method can be a beneficial supplement to determine the parameters of engineering deposit bodies.展开更多
Multiphoton microscopy, relying on the simultaneous absorption of two or more photons by a fluorophore, has come to occupy a prominent place in modern biomedical research with its ability to allow real-time observatio...Multiphoton microscopy, relying on the simultaneous absorption of two or more photons by a fluorophore, has come to occupy a prominent place in modern biomedical research with its ability to allow real-time observation of a single cell and molecules in intact tissues. Multiphoton microscopy exhibits nonlinear optical contrast properties, which can make it possible to provide an exceptionally large depth penetration with less phototoxicity. This system becomes more and more an inspiring tool for a non-invasive imaging system to realize "optical biopsy" and to examine the functions of living cells. In this review, we briefly present the physical principles and properties of multiphoton microscopy as well as the current applications in biological fields. In addition, we address what we see as the future potential of multiphoton microscopy for gastroenterologic research.展开更多
The experiment was conducted using a total of 1392 one-day-old, Cobb commercial male broilers to investigate the effects of a commercial probiotic addition in diet on growth, the development of the small intestine and...The experiment was conducted using a total of 1392 one-day-old, Cobb commercial male broilers to investigate the effects of a commercial probiotic addition in diet on growth, the development of the small intestine and microbial populations of broilers. Broilers were randomly allotted by BW to 1 of 6 replicate cages (29 chicks per cage) for each of 8 treatments in a randomized block design involving one factorial arrangement of treatments. Dietary treatments included the basal diet (including corn, soybean, rapeseed, cottonseed meal) added with 100 mg/kg antibiotic, 0%, 0.05%, 0.1%, 0.15%, 0.2%, 0.25% or 0.3%. The experiment last 42 d and divided into the starter period (1-21 d) and the finisher period (22-42 d). The results showed that there were significant differences in broiler body weight (BW) (P〈0.001), average daily feed intake (ADFI) (P=0.033), relative length of the duodenum (P〈0.001), jejunum (P=0.008), ileum (P〈0.001) and the populations of lactobacillus (P〈0.001) and coliform (P〈0.001) in the rectum between the probiotics treatments and the control treatment only in the starter period of the trails. No significant differences were observed in intestinal morphology parameters in two periods of the experiment. Our results indicated that the probiotic was able to improve the performance of broiler chickens, and it was better in the starter period to be used than in the finisher period.展开更多
One can see often in explanations of encyclopedia or lexicons of philosophy that Plato manifested primarily the absolute Idealism, whereas Aristotle verified antagonistically the relevance of realism. It is easy to pi...One can see often in explanations of encyclopedia or lexicons of philosophy that Plato manifested primarily the absolute Idealism, whereas Aristotle verified antagonistically the relevance of realism. It is easy to pick up several parts of their representative works and prove that this thesis is corresponded to the original of Plato and Aristotle. But, in reflections of philosophy, we should not ignore a cautious view, focused just on this starting point: If the above mentioned thesis is used like a slogan, "Plato for idealism, Aristotle for realism," as it often is, in the meantime there arises a dogmatic position which fixes our mental and intellectual activity only within the frame, so that everyone begins to reflect on Plato or Aristotle from that starting point in a certain framework. A critical and self-critical view of philosophy may bring this position for a query.展开更多
Often conceived as metaphysical approach, in the XX Century, philosophy is object of a crusade antimetaphysical in the movement of Logical Positivism. I will try to demonstrate that a philosophical perspective is conc...Often conceived as metaphysical approach, in the XX Century, philosophy is object of a crusade antimetaphysical in the movement of Logical Positivism. I will try to demonstrate that a philosophical perspective is conceivable even in the scientific conception of the world elaborated by the neopositivists. I discuss this point of view with attention to the turn represented by pragmatic philosophy of Neurath, which represents a crucial passage for the future of philosophy. In this vision, the science is not conceivable without philosophy, namely without an open and pluralist scientific philosophy. The philosophy--so--is not insufficient too for the perspective of scientific conception of the world.展开更多
Computational fluid dynamics is an efficient numerical approach for spray atomization study, but it is challenging to accurately capture the gas-liquid interface. In this work, an accurate conservative level set metho...Computational fluid dynamics is an efficient numerical approach for spray atomization study, but it is challenging to accurately capture the gas-liquid interface. In this work, an accurate conservative level set method is intro- duced to accurately track the gas-liquid interfaces in liquid atomization. To validate the capability of this method, binary drop collision and drop impacting on liquid film are investigated. The results are in good agreement with experiment observations. In addition, primary atomization (swirling sheet atomization) is studied using this method. To the swirling sheet atomization, it is found that Rayleigh-Taylor instability in the azimuthal direction causes the primary breakup of liquid sheet and complex vortex structures are clustered around the rim of the liq- uid sheet. The effects of central gas velocity and liquid-gas density ratio on atomization are also investigated. This work lays a solid foundation for further studvin~ the mechanism of s^rav atomization.展开更多
In recent years, Practice Ontology Aesthetics takes shape in academic discussion and argument. The introduction of Practice Ontology Aesthetics occurred in the course of introspection of Practice Aesthetics in modem C...In recent years, Practice Ontology Aesthetics takes shape in academic discussion and argument. The introduction of Practice Ontology Aesthetics occurred in the course of introspection of Practice Aesthetics in modem China, in which the existence dimension in Marxist concept of practice was of great significance to breaking the theoretical limitation of present Practice Aesthetics. Therefore, in terms of the distinctive context of Chinese contemporary aesthetics, the introduction of Practice Ontology Aesthetics from the theoretical perspective of Marxist existentialism offers a possible way to break the current aesthetics and represents a multiple academic pursuit of Marxist, Chinese and modem aesthetics.展开更多
PURPOSE: To observe the effects of acupuncture on the pituitary-thyroid axis in rabbits with fracture. METHOD: 36 male rabbits with a 3-mm width experimental defect in the middle segment of the left radius were random...PURPOSE: To observe the effects of acupuncture on the pituitary-thyroid axis in rabbits with fracture. METHOD: 36 male rabbits with a 3-mm width experimental defect in the middle segment of the left radius were randomly divided into the treatment group and control group, and the changes in serum T3, T4 and TSH contents in different weeks were investigated. RESULTS: Serum T3, T4 and TSH contents in the treatment group all were higher than those in the control group, with statistically significant differences in the contents of T4 and TSH in the second week and T3 content in the fourth week (P展开更多
This paper computed the newest impact solutions of the potentially dangerous asteroid (99942) Apophis based on 4,138 optical observations from March 15.10789 UTC (Universal Time Coordinated), 2004 to February 28.0...This paper computed the newest impact solutions of the potentially dangerous asteroid (99942) Apophis based on 4,138 optical observations from March 15.10789 UTC (Universal Time Coordinated), 2004 to February 28.089569 UTC, 2014 and 20 radar observations from January 27, 2005 through March 15, 2013, as of June 20, 2014. Using the freely available the OrbFit software Package, this paper followed its orbit forward in the searching for close approaches with the Earth and possible impacts up to year 2116. With the different A2 non-gravitational parameter in the motion of the asteroid (99942) Apophis, this paper computed possible impact solutions using the JPL DE405 (Jet Propulsion Laboratory Development Ephemeris) and 25 additional massive perturbed asteroids. Additionally, this paper used weighing and selection methods adopted in the OrbFit software as prepared by the NEODyS (Near Earth Objects--Dynamical Side) Team. Moreover, this paper used method of computing the orbit of Apophis taking into account star catalog debiasing and an error model with assumed astrometric errors RMS (root mean square), deduced from the observational material of the given observatories. JPL's Sentry and NEODyS's CLOMMON2, two automatic monitoring systems routinely scanning for possible impacts in the next hundred years. Only for several dangerous asteroids presented results are computed with the non-gravitational parameters. This paper detected possible impacts of the asteroid (99942) Apophis only with the non-gravitational parameter, A2 〉 0. It was appeared that impacts in 2068, 2087, 2105 and in 2111 were possible only when Apophis rotated in prograde direction.展开更多
To investigate the complex macro-mechanical properties of coal from a micro-mechanical perspective,we have conducted a series of micro-mechanical experiments on coal using a nano-indentation instrument.These experimen...To investigate the complex macro-mechanical properties of coal from a micro-mechanical perspective,we have conducted a series of micro-mechanical experiments on coal using a nano-indentation instrument.These experiments were conducted under both dynamic and static loading conditions,allowing us to gather the micro-mechanical parameters of coal for further analysis of its micro-mechanical heterogeneity using the box counting statistical method and the Weibull model.The research findings indicate that the load–displacement curves of the coal mass under the two different loading modes exhibit noticeable discreteness.This can be attributed to the stress concentration phenomenon caused by variations in the mechanical properties of the micro-units during the loading process of the coal mass.Consequently,there are significant fluctuations in the micro-mechanical parameters of the coal mass.Moreover,the mechanical heterogeneity of the coal at the nanoscale was confirmed based on the calculation results of the standard deviation coefficient and Weibull modulus of the coal body’s micromechanical parameters.These results reveal the influence of microstructural defects and minerals on the uniformity of the stress field distribution within the loaded coal body,as well as on the ductility characteristics of the micro-defect structure.Furthermore,there is a pronounced heterogeneity in the micromechanical parameters.Furthermore,we have established a relationship between the macro and micro elastic modulus of coal by applying the Mori-Tanaka homogenization method.This relationship holds great significance for revealing the micro-mechanical failure mechanism of coal.展开更多
Given China's dual urban-rural structure, this paper employs the Theil index for measuring and depicting China's urban-rural income disparity and its characteristics. Furthermore, this paper specifies a nonlinear th...Given China's dual urban-rural structure, this paper employs the Theil index for measuring and depicting China's urban-rural income disparity and its characteristics. Furthermore, this paper specifies a nonlinear threshold cointegration model to reveals a nonlinear relationship between the urban-rural income gap and real economic growth over a long period since reform and opening up in China. Our results show that the regime switch of the long-term nonlinear threshold relationship takes place at the 0.100 (threshold value) of the Theil index. From 1978 to 1991, the long-term effect of the urban- rural income disparity on China's economic growth was positive; between 1992 and 1999, there was a smooth transition to a negative effect; and from 1999 on, the negative effect has been increasing year by year. Income disparity now has the effect of retarding China's real economic growth.展开更多
基金National Public Benefit Research Foundation (Meteorology) (GYHY200906008)
文摘The coastal area of southern China is frequently affected by marine meteorological disasters,and is also one of the key areas that influence the short-term climate change of China.Due to a lack of observational facilities and techniques,little has been done in this area in terms of operational weather monitoring and scientific research on atmospheric and marine environment.With the support of China Meteorological Administration (CMA) and Guangdong Meteorological Bureau (GMB),the Marine Meteorological Science Experiment Base (MMSEB) at Bohe,Maoming has been jointly established by Guangzhou Institute of Tropical and Marine Meteorology (GITMM) and Maoming Meteorological Bureau (MMB) of Guangdong Province after three years of hard work.It has become an integrated coastal observation base that is equipped with a complete set of sophisticated instruments.Equipment maintenance and data quality control procedures have been implemented to ensure the long-term,steady operation of the instruments and the availability of high quality data.Preliminary observations show that the data obtained by the MMSEB reveal many interesting features in the boundary layer structure and air-sea interaction in such disastrous weather as typhoons and sea fog.The MMSEB is expected to play an important role in the scientific research of disastrous weather related to marine meteorology.
基金Supported by the National Natural Science Foundation of China under Grant Nos. 50872038 and 10675048
文摘A complex longitudinal magnetoresistance (MR//) effect in the non-stoichiometric silver chaJcogenides (include the silver selenide and telluride) has been found, however the mechanism for the MR// effect is not clear now. In this work, a new random resistor network for MR// effect is proposed based on the experimental observation. The network is constructed from six-terminal resistor units and the mobility of carries within the network has a Gaussian distribution. Considering the non-zero transverse-longitudinal coupling in materials, the resistance matrix of the six- terminal resistor unit is modified. It is found that the material has the "chiral" transverse-longitudinal couplings, which is suggested a main reason for the complex MR//effect. The model predictions are compared with the experimental results. A three dimension (3D) visualization of current flow within the network demonstrates the "current jets" phenomenon in the thickness of materials dearly.
文摘In this paper we propose to discuss the issue of subjectivity versus objectivity teaching practice of foreign language, especially English, in Brazil. Starting from the short story "The Parrot and Descartes" by Pauline Melville, we argue that Cartesianism has influenced a view on education which tends to consider good and valuable what is "scientific", "objective" and "universal". The subjective and the local seem to be considered undesirable and unreliable. Brazilian scholars on the education field, such as Coracini and Souza are important support for our argument.
基金Project(2011CB013504) supported by the National Basic Research Program of ChinaProjects(50911130366, 11172090) supported by the National Natural Science Foundation of ChinaProject supported by Central University Basic Research Special Fund, China
文摘The mechanical properties of outwash deposits which are taken as unconsolidated geo-materials with the characteristics of non-uniformity, heterogeneity and multiphase have attracted much attention in engineering. According to the results of laboratory direct shear test on the remolded samples, the soil particle parameters of numerical model based on in-situ particle size cumulative curves and 3D granular discrete element method were determined. Then, numerical experiments on different lithology, stone content and gradation composition were conducted. The results show that it is not a flat surface but a shear band that yields in the sample. The curve of particle velocity vs distance from the designed shear surface of test model that is taken as a datum plane in the vertical section of sample shows in "S" shape. The shear disturbance area is about twice the maximum diameter of stone blocks. The greater the stiffness of stone is, the rougher the shear surface is. The shear strength of outwash deposits is largely controlled by lithology and stone content, and the bite force between stone blocks is the root reason of larger friction angle. It is also shown that strain hardening and low shear dilatancy occur under high confining pressure as well as possibility of shear shrinkage. But it is easy to behave shear dilatation and strain softening under low confining pressure. The relationship between particle frictional coefficient and stone content presents an approximately quadratic parabola increase. The strain energy first increases and then drops with the increase of frictional energy. The cohesion increases with soil stiffness increasing but decreases with stone stiffness increasing. Numerical results are consistent with the laboratory test results of remolded samples, which indicate that this method can be a beneficial supplement to determine the parameters of engineering deposit bodies.
文摘Multiphoton microscopy, relying on the simultaneous absorption of two or more photons by a fluorophore, has come to occupy a prominent place in modern biomedical research with its ability to allow real-time observation of a single cell and molecules in intact tissues. Multiphoton microscopy exhibits nonlinear optical contrast properties, which can make it possible to provide an exceptionally large depth penetration with less phototoxicity. This system becomes more and more an inspiring tool for a non-invasive imaging system to realize "optical biopsy" and to examine the functions of living cells. In this review, we briefly present the physical principles and properties of multiphoton microscopy as well as the current applications in biological fields. In addition, we address what we see as the future potential of multiphoton microscopy for gastroenterologic research.
文摘The experiment was conducted using a total of 1392 one-day-old, Cobb commercial male broilers to investigate the effects of a commercial probiotic addition in diet on growth, the development of the small intestine and microbial populations of broilers. Broilers were randomly allotted by BW to 1 of 6 replicate cages (29 chicks per cage) for each of 8 treatments in a randomized block design involving one factorial arrangement of treatments. Dietary treatments included the basal diet (including corn, soybean, rapeseed, cottonseed meal) added with 100 mg/kg antibiotic, 0%, 0.05%, 0.1%, 0.15%, 0.2%, 0.25% or 0.3%. The experiment last 42 d and divided into the starter period (1-21 d) and the finisher period (22-42 d). The results showed that there were significant differences in broiler body weight (BW) (P〈0.001), average daily feed intake (ADFI) (P=0.033), relative length of the duodenum (P〈0.001), jejunum (P=0.008), ileum (P〈0.001) and the populations of lactobacillus (P〈0.001) and coliform (P〈0.001) in the rectum between the probiotics treatments and the control treatment only in the starter period of the trails. No significant differences were observed in intestinal morphology parameters in two periods of the experiment. Our results indicated that the probiotic was able to improve the performance of broiler chickens, and it was better in the starter period to be used than in the finisher period.
文摘One can see often in explanations of encyclopedia or lexicons of philosophy that Plato manifested primarily the absolute Idealism, whereas Aristotle verified antagonistically the relevance of realism. It is easy to pick up several parts of their representative works and prove that this thesis is corresponded to the original of Plato and Aristotle. But, in reflections of philosophy, we should not ignore a cautious view, focused just on this starting point: If the above mentioned thesis is used like a slogan, "Plato for idealism, Aristotle for realism," as it often is, in the meantime there arises a dogmatic position which fixes our mental and intellectual activity only within the frame, so that everyone begins to reflect on Plato or Aristotle from that starting point in a certain framework. A critical and self-critical view of philosophy may bring this position for a query.
文摘Often conceived as metaphysical approach, in the XX Century, philosophy is object of a crusade antimetaphysical in the movement of Logical Positivism. I will try to demonstrate that a philosophical perspective is conceivable even in the scientific conception of the world elaborated by the neopositivists. I discuss this point of view with attention to the turn represented by pragmatic philosophy of Neurath, which represents a crucial passage for the future of philosophy. In this vision, the science is not conceivable without philosophy, namely without an open and pluralist scientific philosophy. The philosophy--so--is not insufficient too for the perspective of scientific conception of the world.
基金the National Natural Science Foundation of China(51176170,51276163)the Zhejiang Provincial Natural Science Foundation for Distinguished Young Scholars(LR12E06001)supported by the Fundamental Research Funds for the Central Universities
文摘Computational fluid dynamics is an efficient numerical approach for spray atomization study, but it is challenging to accurately capture the gas-liquid interface. In this work, an accurate conservative level set method is intro- duced to accurately track the gas-liquid interfaces in liquid atomization. To validate the capability of this method, binary drop collision and drop impacting on liquid film are investigated. The results are in good agreement with experiment observations. In addition, primary atomization (swirling sheet atomization) is studied using this method. To the swirling sheet atomization, it is found that Rayleigh-Taylor instability in the azimuthal direction causes the primary breakup of liquid sheet and complex vortex structures are clustered around the rim of the liq- uid sheet. The effects of central gas velocity and liquid-gas density ratio on atomization are also investigated. This work lays a solid foundation for further studvin~ the mechanism of s^rav atomization.
文摘In recent years, Practice Ontology Aesthetics takes shape in academic discussion and argument. The introduction of Practice Ontology Aesthetics occurred in the course of introspection of Practice Aesthetics in modem China, in which the existence dimension in Marxist concept of practice was of great significance to breaking the theoretical limitation of present Practice Aesthetics. Therefore, in terms of the distinctive context of Chinese contemporary aesthetics, the introduction of Practice Ontology Aesthetics from the theoretical perspective of Marxist existentialism offers a possible way to break the current aesthetics and represents a multiple academic pursuit of Marxist, Chinese and modem aesthetics.
文摘PURPOSE: To observe the effects of acupuncture on the pituitary-thyroid axis in rabbits with fracture. METHOD: 36 male rabbits with a 3-mm width experimental defect in the middle segment of the left radius were randomly divided into the treatment group and control group, and the changes in serum T3, T4 and TSH contents in different weeks were investigated. RESULTS: Serum T3, T4 and TSH contents in the treatment group all were higher than those in the control group, with statistically significant differences in the contents of T4 and TSH in the second week and T3 content in the fourth week (P
文摘This paper computed the newest impact solutions of the potentially dangerous asteroid (99942) Apophis based on 4,138 optical observations from March 15.10789 UTC (Universal Time Coordinated), 2004 to February 28.089569 UTC, 2014 and 20 radar observations from January 27, 2005 through March 15, 2013, as of June 20, 2014. Using the freely available the OrbFit software Package, this paper followed its orbit forward in the searching for close approaches with the Earth and possible impacts up to year 2116. With the different A2 non-gravitational parameter in the motion of the asteroid (99942) Apophis, this paper computed possible impact solutions using the JPL DE405 (Jet Propulsion Laboratory Development Ephemeris) and 25 additional massive perturbed asteroids. Additionally, this paper used weighing and selection methods adopted in the OrbFit software as prepared by the NEODyS (Near Earth Objects--Dynamical Side) Team. Moreover, this paper used method of computing the orbit of Apophis taking into account star catalog debiasing and an error model with assumed astrometric errors RMS (root mean square), deduced from the observational material of the given observatories. JPL's Sentry and NEODyS's CLOMMON2, two automatic monitoring systems routinely scanning for possible impacts in the next hundred years. Only for several dangerous asteroids presented results are computed with the non-gravitational parameters. This paper detected possible impacts of the asteroid (99942) Apophis only with the non-gravitational parameter, A2 〉 0. It was appeared that impacts in 2068, 2087, 2105 and in 2111 were possible only when Apophis rotated in prograde direction.
基金Projects(U23B2093,52274245)supported by the National Natural Science Foundation of ChinaProject(KFJJ22-15M)supported by the Opening Project of State Key Laboratory of Explosion Science and Technology,China。
文摘To investigate the complex macro-mechanical properties of coal from a micro-mechanical perspective,we have conducted a series of micro-mechanical experiments on coal using a nano-indentation instrument.These experiments were conducted under both dynamic and static loading conditions,allowing us to gather the micro-mechanical parameters of coal for further analysis of its micro-mechanical heterogeneity using the box counting statistical method and the Weibull model.The research findings indicate that the load–displacement curves of the coal mass under the two different loading modes exhibit noticeable discreteness.This can be attributed to the stress concentration phenomenon caused by variations in the mechanical properties of the micro-units during the loading process of the coal mass.Consequently,there are significant fluctuations in the micro-mechanical parameters of the coal mass.Moreover,the mechanical heterogeneity of the coal at the nanoscale was confirmed based on the calculation results of the standard deviation coefficient and Weibull modulus of the coal body’s micromechanical parameters.These results reveal the influence of microstructural defects and minerals on the uniformity of the stress field distribution within the loaded coal body,as well as on the ductility characteristics of the micro-defect structure.Furthermore,there is a pronounced heterogeneity in the micromechanical parameters.Furthermore,we have established a relationship between the macro and micro elastic modulus of coal by applying the Mori-Tanaka homogenization method.This relationship holds great significance for revealing the micro-mechanical failure mechanism of coal.
基金This paper is financially supported by the National Science Foundation of China, Grant 70571026.
文摘Given China's dual urban-rural structure, this paper employs the Theil index for measuring and depicting China's urban-rural income disparity and its characteristics. Furthermore, this paper specifies a nonlinear threshold cointegration model to reveals a nonlinear relationship between the urban-rural income gap and real economic growth over a long period since reform and opening up in China. Our results show that the regime switch of the long-term nonlinear threshold relationship takes place at the 0.100 (threshold value) of the Theil index. From 1978 to 1991, the long-term effect of the urban- rural income disparity on China's economic growth was positive; between 1992 and 1999, there was a smooth transition to a negative effect; and from 1999 on, the negative effect has been increasing year by year. Income disparity now has the effect of retarding China's real economic growth.