摘要 :
With rapid development of internet, the expansion of information restricts the effect of learning. This paper designs an education video personalized recommendation system based on collaborative filtering recommendation technology...
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With rapid development of internet, the expansion of information restricts the effect of learning. This paper designs an education video personalized recommendation system based on collaborative filtering recommendation technology. We design this system mainly based on collaborative technology and content analysis technology. This system can increase the effect of teaching, also can increase the learning autonomy of students and make students studying high-efficiency. This system has been applied to Shanghai Lifelong Learning Network and achieves significant influence.
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摘要 :
With rapid development of internet, the expansion of information restricts the effect of learning. This paper designs an education video personalized recommendation system based on collaborative filtering recommendation technology...
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With rapid development of internet, the expansion of information restricts the effect of learning. This paper designs an education video personalized recommendation system based on collaborative filtering recommendation technology. We design this system mainly based on collaborative technology and content analysis technology. This system can increase the effect of teaching, also can increase the learning autonomy of students and make students studying high-efficiency. This system has been applied to Shanghai Lifelong Learning Network and achieves significant influence.
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摘要 :
Gold has sulphur-closed affinity, and is often in close symbiotic relationship with sulphides such as pyrite, arsenopyrite, galena, and stibnite. In complex multi-metals containing vulcanized gold ores, the flotability of differen...
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Gold has sulphur-closed affinity, and is often in close symbiotic relationship with sulphides such as pyrite, arsenopyrite, galena, and stibnite. In complex multi-metals containing vulcanized gold ores, the flotability of different kinds of these minerals are closed, making it hard to separate gold and harmful metals. [1]New flotation processes includes mixed flotation among gold-bearing sulfide ores, which can make gold and other valuable metals enriched to mixed concentrate at the maximum limit. One complex polymetallic ore contains a variety of valuable metallic elements such as gold, lead, zinc etc. According to the principle of priority flotation of higher valued minerals, given consideration to the recycle of other useful minerals, the paper focused on recycling of gold and lead ores, meanwhile recovering zinc ore as much as possible. [2]The process the experiment adopted includes the mixed flotation of gold, lead and sulfur, separation of gold and lead from sulfur and arsenic, and activate zinc in mixed flotation of tailings. In order to improve the recovery rate of gold, oxalic acids activation used as a high efficiency activator of gold, ammonium butyl aerofloat, butyl xanthate and ethyl xanthogenate were used as collectors for gold and lead flotation. Under this reagent system, the comprehensive recovery of gold exceeded 90%, which was a good indicator of mineral beneficiation technology.
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摘要 :
Gold has sulphur-closed affinity, and is often in close symbiotic relationship with sulphides such as pyrite, arsenopyrite, galena, and stibnite. In complex multi-metals containing vulcanized gold ores, the flotability of differen...
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Gold has sulphur-closed affinity, and is often in close symbiotic relationship with sulphides such as pyrite, arsenopyrite, galena, and stibnite. In complex multi-metals containing vulcanized gold ores, the flotability of different kinds of these minerals are closed, making it hard to separate gold and harmful metals. [1]New flotation processes includes mixed flotation among gold-bearing sulfide ores, which can make gold and other valuable metals enriched to mixed concentrate at the maximum limit. One complex polymetallic ore contains a variety of valuable metallic elements such as gold, lead, zinc etc. According to the principle of priority flotation of higher valued minerals, given consideration to the recycle of other useful minerals, the paper focused on recycling of gold and lead ores, meanwhile recovering zinc ore as much as possible. [2]The process the experiment adopted includes the mixed flotation of gold, lead and sulfur, separation of gold and lead from sulfur and arsenic, and activate zinc in mixed flotation of tailings. In order to improve the recovery rate of gold, oxalic acids activation used as a high efficiency activator of gold, ammonium butyl aerofloat, butyl xanthate and ethyl xanthogenate were used as collectors for gold and lead flotation. Under this reagent system, the comprehensive recovery of gold exceeded 90%, which was a good indicator of mineral beneficiation technology.
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摘要 :
Gold has sulphur-closed affinity, and is often in close symbiotic relationship with sulphides such as pyrite, arsenopyrite, galena, and stibnite. In complex multi-metals containing vulcanized gold ores, the flotability of differen...
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Gold has sulphur-closed affinity, and is often in close symbiotic relationship with sulphides such as pyrite, arsenopyrite, galena, and stibnite. In complex multi-metals containing vulcanized gold ores, the flotability of different kinds of these minerals are closed, making it hard to separate gold and harmful metals. [l]New flotation processes includes mixed flotation among gold-bearing sulfide ores, which can make gold and other valuable metals enriched to mixed concentrate at the maximum limit,.One complex polymetallic ore contains a variety of valuable metallic elements such as gold, lead, zinc etc. According to the principle of priority flotation of higher valued minerals, given consideration to the recycle of other useful minerals, the paper focused on recycling of gold and lead ores, meanwhile recovering zinc ore as much as possible. [2]The process the experiment adopted includes the mixed flotation of gold, lead and sulfur, separation of gold and lead from sulfur and arsenic, and activate zinc in mixed flotation of tailings. In order to improve the recovery rate of gold, oxalic acids activation used as a high efficiency activator of gold, ammonium butyl aerofloat ,butyl xanthate and ethyl xanthogenate were used as collectors for gold and lead flotation. Under this reagent system, the comprehensive recovery of gold exceeded 90%, which was a good indicator of mineral beneficiation technology.
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摘要 :
Gold has sulphur-closed affinity, and is often in close symbiotic relationship with sulphides such as pyrite, arsenopyrite, galena, and stibnite. In complex multi-metals containing vulcanized gold ores, the flotability of differen...
展开
Gold has sulphur-closed affinity, and is often in close symbiotic relationship with sulphides such as pyrite, arsenopyrite, galena, and stibnite. In complex multi-metals containing vulcanized gold ores, the flotability of different kinds of these minerals are closed, making it hard to separate gold and harmful metals. [l]New flotation processes includes mixed flotation among gold-bearing sulfide ores, which can make gold and other valuable metals enriched to mixed concentrate at the maximum limit,.One complex polymetallic ore contains a variety of valuable metallic elements such as gold, lead, zinc etc. According to the principle of priority flotation of higher valued minerals, given consideration to the recycle of other useful minerals, the paper focused on recycling of gold and lead ores, meanwhile recovering zinc ore as much as possible. [2]The process the experiment adopted includes the mixed flotation of gold, lead and sulfur, separation of gold and lead from sulfur and arsenic, and activate zinc in mixed flotation of tailings. In order to improve the recovery rate of gold, oxalic acids activation used as a high efficiency activator of gold, ammonium butyl aerofloat ,butyl xanthate and ethyl xanthogenate were used as collectors for gold and lead flotation. Under this reagent system, the comprehensive recovery of gold exceeded 90%, which was a good indicator of mineral beneficiation technology.
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摘要 :
The construction of the centrifugal compressor model and its application for the mechanical vapor recompression (MVR) system dynamic simulation were presented. Instead of lumped loss equations, the centrifugal compressor model use...
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The construction of the centrifugal compressor model and its application for the mechanical vapor recompression (MVR) system dynamic simulation were presented. Instead of lumped loss equations, the centrifugal compressor model used established one-dimensional (1D) loss equations found in open literature. The losses were modeled not only in the impeller but also in the diffuser and the volute. Given specified geometry, rotational speed and suction condition, the model was capable of calculating the static and total temperatures, velocities, static and total pressures, pressure losses, polytropic head and isentropic efficiencies for each compressor component. The behavior of the centrifugal compressor of the MVR system was investigated by both the model and the experiments. The model was helpful for the designer to minimize the magnitude of the losses and justify optimum design decisions. The performance and the surge curve over the entire operating conditions provided by the model were incorporated with the MVR system dynamic simulation and then it was possible for dynamic study on the response of the anti-surge control under the situation of the check valve failure.
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摘要 :
In this study, by changing Z-pin's insertion parameters, the X-cor sandwich was prepared with vacuum curing molding process. The effects of Z-pin's insertion angle, insertion density and diameter on compression, shear and tension ...
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In this study, by changing Z-pin's insertion parameters, the X-cor sandwich was prepared with vacuum curing molding process. The effects of Z-pin's insertion angle, insertion density and diameter on compression, shear and tension properties were studied. The results show that Z-pin's insertion parameters can significantly affect the mechanical properties of X-cor sandwich. The compression properties of X-cor sandwich are reduced, while shear properties are improved by the increase of Z-pin's insertion angle. As Z-pin's insertion angle increases the tension modulus increases while the tension strength firstly increases and secondly decreases. The mechanical properties increase with the increase of Z-pin's insertion density and diameter. Compared with the foam core sandwich, the mechanical properties of X-cor sandwich are significantly improved in both modulus and strength.
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摘要 :
In this study, by changing Z-pin's insertion parameters, the X-cor sandwich was prepared with vacuum curing molding process. The effects of Z-pin's insertion angle, insertion density and diameter on compression, shear and tension ...
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In this study, by changing Z-pin's insertion parameters, the X-cor sandwich was prepared with vacuum curing molding process. The effects of Z-pin's insertion angle, insertion density and diameter on compression, shear and tension properties were studied. The results show that Z-pin's insertion parameters can significantly affect the mechanical properties of X-cor sandwich. The compression properties of X-cor sandwich are reduced, while shear properties are improved by the increase of Z-pin's insertion angle. As Z-pin's insertion angle increases the tension modulus increases while the tension strength firstly increases and secondly decreases. The mechanical properties increase with the increase of Z-pin's insertion density and diameter. Compared with the foam core sandwich, the mechanical properties of X-cor sandwich are significantly improved in both modulus and strength.
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摘要 :
In this study, by changing Z-pin’s insertion parameters, the X-cor sandwich was prepared with vacuum curing molding process. The effects of Z-pin’s insertion angle, insertion density and diameter on compression, shear and tensio...
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In this study, by changing Z-pin’s insertion parameters, the X-cor sandwich was prepared with vacuum curing molding process. The effects of Z-pin’s insertion angle, insertion density and diameter on compression, shear and tension properties were studied. The results show that Z-pin’s insertion parameters can significantly affect the mechanical properties of X-cor sandwich. The compression properties of X-cor sandwich are reduced, while shear properties are improved by the increase of Z-pin’s insertion angle. As Z-pin’s insertion angle increases the tension modulus increases while the tension strength firstly increases and secondly decreases. The mechanical properties increase with the increase of Z-pin’s insertion density and diameter. Compared with the foam core sandwich, the mechanical properties of X-cor sandwich are significantly improved in both modulus and strength.
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