摘要 :
Beginning with the minimal complete cells graph in dynamic manufacturing alliance, distinguish the linear and nonlinear relation among cells. Under the linear interactions, a systematic effect model (SEM) created in the form of co...
展开
Beginning with the minimal complete cells graph in dynamic manufacturing alliance, distinguish the linear and nonlinear relation among cells. Under the linear interactions, a systematic effect model (SEM) created in the form of constant coefficient differential equation. Under the nonlinear interactions, the two dimensional Volterra model applied and extended, then got the new SEM in the form of Volterra model. About the solution and its process is the tool for determining the characteristics of cells, cells selection and the analysis of returns trend of cells.
收起
摘要 :
Ningxia Hui Autonomous Region locates in north west of China. Recent 10 years, the economic and social level of Ningxia improved much. Therefore, land cover influenced by the natural and human activities changed greatly. Remote se...
展开
Ningxia Hui Autonomous Region locates in north west of China. Recent 10 years, the economic and social level of Ningxia improved much. Therefore, land cover influenced by the natural and human activities changed greatly. Remote sensing united GIS is an effective method to observing and overseeing the long-term and insignificant change of the environment or the ecosystem. TM images are the essential information sources of land-cover. In semi-arid and arid, especially in the transition belt of the physical geography, the method would be more useful to discover the change mechanism of land-cover. During the 10 years, farmland had great change, and about 86% was compensated by grassland. Rapidly increased population is the most important driver in the land cover change. So construction area also increased quickly. Comparing land cover change with socioeconomic variables, we found that the land cover changes with the little human influence were impacted by the climate alternation. Also climate alternation is another important driver. Among main land cover types, the changes are consistent with the climate change.
收起
摘要 :
Ningxia Hui Autonomous Region locates in north west of China. Recent 10 years, the economic and social level of Ningxia improved much. Therefore, land cover influenced by the natural and human activities changed greatly. Remote se...
展开
Ningxia Hui Autonomous Region locates in north west of China. Recent 10 years, the economic and social level of Ningxia improved much. Therefore, land cover influenced by the natural and human activities changed greatly. Remote sensing united GIS is an effective method to observing and overseeing the long-term and insignificant change of the environment or the ecosystem. TM images are the essential information sources of land-cover. In semi-arid and arid, especially in the transition belt of the physical geography, the method would be more useful to discover the change mechanism of land-cover. During the 10 years, farmland had great change, and about 86% was compensated by grassland. Rapidly increased population is the most important driver in the land cover change. So construction area also increased quickly. Comparing land cover change with socioeconomic variables, we found that the land cover changes with the little human influence were impacted by the climate alternation. Also climate alternation is another important driver. Among main land cover types, the changes are consistent with the climate change.
收起
摘要 :
In this paper pure carbon nanotubes (CNTs), straight CNTs and aligned CNTs were synthesized by microwave plasma chemical vapor deposition (MWPCVD) at the low temperature of about 570 ℃. By decreasing the carbon precursor content ...
展开
In this paper pure carbon nanotubes (CNTs), straight CNTs and aligned CNTs were synthesized by microwave plasma chemical vapor deposition (MWPCVD) at the low temperature of about 570 ℃. By decreasing the carbon precursor content or strengthening the etching ability of some specials, such as atomic hydrogen, atomic oxygen or OH radicals, the purity of CNTs can be improved. For straight CNTs, it can be produced under the catalytic effect of Fe-Co-Ni alloy particles due to its uniform catalytic activity around its circumference. Aligned CNTs on nickel substrate were also synthesized by MWPCVD. All these research results may be useful in the study of the properties of CNTs and for potential applications of CNTs.
收起
摘要 :
In this paper pure carbon nanotubes (CNTs), straight CNTs and aligned CNTs were synthesized by microwave plasma chemical vapor deposition (MWPCVD) at the low temperature of about 570 ℃. By decreasing the carbon precursor content ...
展开
In this paper pure carbon nanotubes (CNTs), straight CNTs and aligned CNTs were synthesized by microwave plasma chemical vapor deposition (MWPCVD) at the low temperature of about 570 ℃. By decreasing the carbon precursor content or strengthening the etching ability of some specials, such as atomic hydrogen, atomic oxygen or OH radicals, the purity of CNTs can be improved. For straight CNTs, it can be produced under the catalytic effect of Fe-Co-Ni alloy particles due to its uniform catalytic activity around its circumference. Aligned CNTs on nickel substrate were also synthesized by MWPCVD. All these research results may be useful in the study of the properties of CNTs and for potential applications of CNTs.
收起
摘要 :
Earning was one of the most important accounting information disclosed by the enterprises, particularly in the capital market environment, as well as the medium-term annual earnings figures in the report are one of the most import...
展开
Earning was one of the most important accounting information disclosed by the enterprises, particularly in the capital market environment, as well as the medium-term annual earnings figures in the report are one of the most important information transferred by listed companies to investors. Now in financial theory, the assessment models often predict and analyze a company's value based on accounting earning. Therefore, the accounting earning is one of the most intuitive targets to reflect on business' operating results for a certain period, which has been widely considered as a high information content. However, in different years, in the different framework of time and space industries, the information content of the accounting earning is very different, namely, there are differences in quality. Therefore, this paper will study on relationship between the industry characteristics of the listed companies and earnings quality based on the experience data of the listed companies.
收起
摘要 :
The problems of finite-time stochastic boundedness and robust H_∞ control for stochastic singular systems are investigated in this paper. Firstly, sufficient conditions of finite-time stochastic boundedness on state feedback are ...
展开
The problems of finite-time stochastic boundedness and robust H_∞ control for stochastic singular systems are investigated in this paper. Firstly, sufficient conditions of finite-time stochastic boundedness on state feedback are obtained for the family of stochastic singular systems with parametric uncertainties and external disturbance. And then, designed state feedback controller is provided to guarantee that the underlying closed-loop stochastic singular system is robust H_∞ finite-time stochastic boundedness in terms of strict linear matrix equalities with a fixed parameter. Finally, a simulation example is presented to illustrate the effectiveness of the obtained results.
收起
摘要 :
The coal industry is in the important position of national economy in China. For the investment projects, its mining exploration has the characteristics of longer cycle, larger investment scale and higher risk etc. Especially in t...
展开
The coal industry is in the important position of national economy in China. For the investment projects, its mining exploration has the characteristics of longer cycle, larger investment scale and higher risk etc. Especially in the later stage of coal mining project, due to increased difficulties of coal mining and reduced coal resources, coal mining with the economic benefit is falling rapidly. However, the traditional evaluation method of coal mining project investment isn't considered the selective which happens at the later process, causing the traditional evaluation method to underestimate the value of the project. This article analyzed the shortcomings of the traditional evaluation method, combined with the characteristics of the later stage of coal mining project, and then established the model of abandon option. This can provide coal enterprise a new method to making scientific investment decision.
收起
摘要 :
The proposed wavefront testing method in time- and spatial-domain takes advantage of both active and passive phase-shifting. It obtains stable wavefront with random noises removed after processing of large amount of serially colle...
展开
The proposed wavefront testing method in time- and spatial-domain takes advantage of both active and passive phase-shifting. It obtains stable wavefront with random noises removed after processing of large amount of serially collected interforograms. Since the environmental vibration and air turbulence are adopted as the passive phase-shifting source, this method performs well in normal laboratory environment without special vibration isolation or air flow control. This method has application prospect in large-aperture optical surface test because it can help simplify the system and reduce the cost and difficulty in fabrication. In order to quantitatively evaluate the anti-vibration capability of this method, the influence of vibration on the measurement accuracy is simulated and analyzed. It is confirmed that corresponding to certain accuracy tolerance, the product of maximum tolerant vibration amplitude and frequency is invariable. This very product is adopted as the threshold indicating anti-vibration capability. More conclusions can be drawn after analysis about the influence of active phase-shifting velocity, sampling frame frequency and relative sampling frame number on the measurement accuracy: when the relative sampling frame number is fixed, the anti-vibration capability of the method is increased with active phase-sifting velocity.
收起
摘要 :
The proposed wavefront testing method in time- and spatial-domain takes advantage of both active and passive phase-shifting. It obtains stable wavefront with random noises removed after processing of large amount of serially colle...
展开
The proposed wavefront testing method in time- and spatial-domain takes advantage of both active and passive phase-shifting. It obtains stable wavefront with random noises removed after processing of large amount of serially collected interforograms. Since the environmental vibration and air turbulence are adopted as the passive phase-shifting source, this method performs well in normal laboratory environment without special vibration isolation or air flow control. This method has application, prospect in large-aperture optical surface test because it can help simplify the system and reduce the cost and difficulty in fabrication. In order to quantitatively evaluate the anti-vibration capability of this method, the influence of vibration on the measurement accuracy is simulated and analyzed. It is confirmed that corresponding to certain accuracy tolerance, the product of maximum tolerant vibration amplitude and frequency is invariable. This very product is adopted as the threshold indicating anti-vibration capability. More conclusions can be drawn after analysis about the influence of active phase-shifting velocity, sampling frame frequency and relative sampling frame number on the measurement accuracy: when the relative sampling frame number is fixed, the anti-vibration capability of the method is increased with active phase-sifting velocity.
收起
原文获取