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The performance of the wireless communication system depends on the designer's understanding to the regular pattern of environment electrical noise distribution in which the communication system is located. The lack of the knowled...
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The performance of the wireless communication system depends on the designer's understanding to the regular pattern of environment electrical noise distribution in which the communication system is located. The lack of the knowledge of the underground coal mine's electrical noise distribution usually led to the current common practice as directly adoption the terrestrial wireless communication systems property index when design the underground coal mine's wireless communication system. The huge difference does exist between the underground coal mine's electrical noise distribution and the terrestrial counterpart, which usually causes the underground wireless communication system's decline in the communication quality, or not functioning properly. As the special circumstances of underground coal mine makes it difficult to apply the terrestrial electrical noise measurement method in the underground, this article presents a new method for measuring the electrical noise in underground coal mine, which has been successfully applied in measuring the typical underground coal mine's electrical noise distribution.
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摘要 :
The performance of the wireless communication system depends on the designer's understanding to the regular pattern of environment electrical noise distribution in which the communication system is located. The lack of the knowled...
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The performance of the wireless communication system depends on the designer's understanding to the regular pattern of environment electrical noise distribution in which the communication system is located. The lack of the knowledge of the underground coal mine's electrical noise distribution usually led to the current common practice as directly adoption the terrestrial wireless communication systems property index when design the underground coal mine's wireless communication system. The huge difference does exist between the underground coal mine's electrical noise distribution and the terrestrial counterpart, which usually causes the underground wireless communication system's decline in the communication quality, or not functioning properly. As the special circumstances of underground coal mine makes it difficult to apply the terrestrial electrical noise measurement method in the underground, this article presents a new method for measuring the electrical noise in underground coal mine, which has been successfully applied in measuring the typical underground coal mine's electrical noise distribution.
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The future warfare will be information joint. In order to achieve a high degree of integration of multiple combat forces, such as land, sea, air and rocket forces, space-based information support power should provide effective inf...
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The future warfare will be information joint. In order to achieve a high degree of integration of multiple combat forces, such as land, sea, air and rocket forces, space-based information support power should provide effective information security. In space-based information support joint operations, various satellite systems are required to cooperate with and complement each other to accomplish the corresponding tasks. The construction and evaluation of reasonable satellite application technology system based on long-range precision strike capability could provide technical support for the development of satellite application equipment. It is of great significance to improve the long-range precision strike capability for the space-based information support.
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摘要 :
The future warfare will be information joint. In order to achieve a high degree of integration of multiple combat forces, such as land, sea, air and rocket forces, space-based information support power should provide effective inf...
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The future warfare will be information joint. In order to achieve a high degree of integration of multiple combat forces, such as land, sea, air and rocket forces, space-based information support power should provide effective information security. In space-based information support joint operations, various satellite systems are required to cooperate with and complement each other to accomplish the corresponding tasks. The construction and evaluation of reasonable satellite application technology system based on long-range precision strike capability could provide technical support for the development of satellite application equipment. It is of great significance to improve the long-range precision strike capability for the space-based information support.
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Taking into account the development trend of distributed photovoltaic power generation, there will be a high permeability of PV in the future distribution network, and the traditional three stage current protection will be no long...
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Taking into account the development trend of distributed photovoltaic power generation, there will be a high permeability of PV in the future distribution network, and the traditional three stage current protection will be no longer applicable because of the malfunction or rejection. In order to maximize the use of distributed photovoltaic power supply, in the future, when there is failure in the power grid, PV should be encouraged to take part of the important load and operated according to the plan. This paper, based on the idea, puts forward a protection scheme for distribution network partition. First of all, according to the load and the principle of balanced PV capacity, carry out partition of distribution network, and then design the fault location algorithm, and finally verify the proposed algorithm by taking the IEEE33 node distribution system as an example. The verification results show that the proposed algorithm of fault region based on matrix algorithm has validity and feasibility. That is to say, this distribution network partition protection scheme with multiple distributed photovoltaic power is feasible.
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The researches on competitive mode choice behavior between e-bike and bike are useful for the analysis and forecast of traffic mode, non-motor traffic planning and related policy. With the sampling survey data in Kunming, the comp...
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The researches on competitive mode choice behavior between e-bike and bike are useful for the analysis and forecast of traffic mode, non-motor traffic planning and related policy. With the sampling survey data in Kunming, the competitive choice model between e-bike and bike based on discrete choice model is established. The result shows that income, age, and travel time have greatly effect on the mode choice behavior between the e-bike and bike. The people in the group with household income below twenty thousands Yuan are more inclined to use bike. For the people in the group with household income above forty thousands Yuan, e-bike is more competitive than bike.
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Aiming at the weakness and deficiency of current coal mine monitoring system, this paper discusses the design and implementation of a platform to remotely monitor and control coal mine production processes over Industrial Ethernet...
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Aiming at the weakness and deficiency of current coal mine monitoring system, this paper discusses the design and implementation of a platform to remotely monitor and control coal mine production processes over Industrial Ethernet by using the embedded technology. Integrated with each lower computer terminal are S3C2410 microprocessors that can be used for connectivity to the monitoring network effectively. Besides the terminal core S3C2410, the hardware circuits of memory module, Ethernet module, USB module, input and output channels, LCD display module, and RS232 serial module are studied and designed. Additionally, Linux-based application software that facilitates remote monitoring and control of lower computer terminals using Qt/embedded has also been developed. The monitoring system presented in this paper can not only meet the requirements of coal mine production process, but also has a wide range of applications in other industrial monitoring fields.
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Once the model predictive control (MPC) came out, it has been developing rapidly in various industries. As a branch of DMC, the step response prediction model is adopted. In this paper, the prediction model of controlled object is...
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Once the model predictive control (MPC) came out, it has been developing rapidly in various industries. As a branch of DMC, the step response prediction model is adopted. In this paper, the prediction model of controlled object is established by Siemens S7-300 controller. Using SCL language, the dynamic matrix control method is realized. The water tank is used as the first-order simulation object to realize the constant value control of liquid level. In the case of water level disturbance, good control effect is achieved.
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摘要 :
Once the model predictive control (MPC) came out, it has been developing rapidly in various industries. As a branch of DMC, the step response prediction model is adopted. In this paper, the prediction model of controlled object is...
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Once the model predictive control (MPC) came out, it has been developing rapidly in various industries. As a branch of DMC, the step response prediction model is adopted. In this paper, the prediction model of controlled object is established by Siemens S7-300 controller. Using SCL language, the dynamic matrix control method is realized. The water tank is used as the first-order simulation object to realize the constant value control of liquid level. In the case of water level disturbance, good control effect is achieved.
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As an important part of the university-enterprise cooperation, the embedded talent training has played a significant role in the talent training. On the purpose of cultivating applied talents to adapt to the development of related...
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As an important part of the university-enterprise cooperation, the embedded talent training has played a significant role in the talent training. On the purpose of cultivating applied talents to adapt to the development of related industries, Nanjing University of Information Science & Technology carried out the teaching reform of the embedded talent training with the cooperation of Jiangsu Ruipin Information Technology Co., Ltd. By constructing the curriculum system for embedded talent training, strengthening the construction of teachers' team, and improving the practice training conditions, the quality of the talent training has been comprehensively improved.
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