Given the increasingly notable segmentation of underground space by existing subway tunnels, it is dif- ficult to effectively and adequately develop and utilize underground space in busy parts of a city. This study pr...Given the increasingly notable segmentation of underground space by existing subway tunnels, it is dif- ficult to effectively and adequately develop and utilize underground space in busy parts of a city. This study presents a combined construction technology that has been developed for use in underground spaces; it includes a deformation buffer layer, a special grouting technique, jump excavation by compart- ment, back-pressure portal frame technology, a reinforcement technique, and the technology of a steel portioning drum or plate. These technologies have been successfully used in practical engineering. The combined construction technology presented in this paper provides a new method of solving key techni- cal problems in underground spaces in effectively used cross-subway tunnels. As this technology has achieved significant economic and social benefits, it has valuable future applications.展开更多
The connection between all the single systems iu combined technology is analysed, and the mine engineering reliability is calculated in any area of the mines using combined technololgy system. The reliability design a...The connection between all the single systems iu combined technology is analysed, and the mine engineering reliability is calculated in any area of the mines using combined technololgy system. The reliability design and distribution method in this system is put forward, thus the basis is set for the decision to raise the total production capability or the surface mines in which the combined system is used.展开更多
At present,the problem of heavy metal pollution in farmland in southern China is serious. Especially,the cadmium and lead are two heavy metal elements with serious pollution and great harm to human body. This paper re...At present,the problem of heavy metal pollution in farmland in southern China is serious. Especially,the cadmium and lead are two heavy metal elements with serious pollution and great harm to human body. This paper reviewed some common methods and materials used in the control of cadmium and lead pollution in farmland soil. Then,it discussed the problems in the repair of cadmium and lead pollution in farmland soil. It came up with the future research direction,to provide references for remediation of lead and cadmium pollution in farmland soil.展开更多
Our study group has developed a unique combined ters from the industries of dyestuff, pharmaceutical, chemical biological technology to treat high-strength organic wastewaengineering and zymolysis by using the princip...Our study group has developed a unique combined ters from the industries of dyestuff, pharmaceutical, chemical biological technology to treat high-strength organic wastewaengineering and zymolysis by using the principles of anaerobic ecological niche and bio-phase separation. The study obtained five national invention patents and eight patent equipments. This technology contains four kernel processes - two-phase anaerobic-aerobic process, hydrolysis-acidification-oxidation process, UASBAF-oxidation process, and internal cycling-hydrolysis-oxidation process. Fifteen pilot projects were accomplished in the basins of Tai Lake, Huai River, Liao River and Songhua River, and their total capital investment reached 185.214 million Yuan （RMB）. Compared to conventional wastewater treatment technology, the innovative technology is more costeffective for high-strength organic wastewater treatment, can save capital investment by 15% - 30%, lessen land usage by 20% to 40% and decrease the operating cost by 10% to 25%. The operating cost of treatment per cubic meter industrial wastewater could be below 0.6 to 1.4 Yuan （RMB）.展开更多
Severe combined immunodeficiency disease(SCID),characterized by profound immune system dysfunction,can lead to life-threatening infections and death.Animal models play a pivotal role in elucidating biological processe...Severe combined immunodeficiency disease(SCID),characterized by profound immune system dysfunction,can lead to life-threatening infections and death.Animal models play a pivotal role in elucidating biological processes and advancing therapeutic strategies.Recent advances in gene-editing technologies,including zincfinger nucleases(ZFNs),transcription activator-like effector nucleases(TALENs),CRISPR/Cas9,and base editing,have significantly enhanced the generation of SCID models.These models have not only deepened our understanding of disease pathophysiology but have also driven progress in cancer therapy,stem cell transplantation,organ transplantation,and infectious diseasemanagement.Thisreviewprovidesa comprehensive overview of current SCID models generated using novel gene-editing approaches,highlighting their potential applications in translational medicine and their role in advancing biomedical research.展开更多
Under the impetus of environmental protection policies,the discharge requirements for leachate are becoming more and more stringent.Therefore,the treatment technology of landfill leachate has become a hot research top...Under the impetus of environmental protection policies,the discharge requirements for leachate are becoming more and more stringent.Therefore,the treatment technology of landfill leachate has become a hot research topic at present.In this paper,the chemical composition and water quality characteristics of landfill leachate were briefly introduced,and the characteristics and performance of nanofiltration technology were summarized at first.Afterwards,the recent advances in the application of nanofiltration combination technology in the treatment of landfill leachate at home and abroad were summarized,and the research and application of the combination of membrane separation,chemical coagulation,chemical oxidation and adsorption methods with nanofiltration membrane in the treatment of landfill leachate were mainly introduced.Finally,it is proposed that the combination of nanofiltration technology is feasible and economical,and its reasonable selection and optimization are the directions of future research and have good application prospects.展开更多
At this stage, with the improvement of social living standards, as well as the rapid development of new science and technology, computer has become an indispensable new technology in the market economy environment and...At this stage, with the improvement of social living standards, as well as the rapid development of new science and technology, computer has become an indispensable new technology in the market economy environment and people's work and life, and the National Research on the computer industry is gradually strengthened. Driven by the computer industry, the economic benefits of various industries have been greatly improved. At present, computer-aided technology is mainly used in mechanical design and manufacturing. The application of this technology can greatly improve the work efficiency of mechanical design and manufacturing, ensure the design and manufacturing quality of various parts, meet people's demand standards, and create better development space for enterprises.The combination of computer-aided technology and mechanical design and manufacturing is an inevitable trend of the times, and also an important choice to create social and economic benefits.展开更多
In order to explore the design method of combining modern green building context with green technology, this paper analyzes the design of Guangzhou Tianhe Smart City Software Park Software Industry Incubation Center (...In order to explore the design method of combining modern green building context with green technology, this paper analyzes the design of Guangzhou Tianhe Smart City Software Park Software Industry Incubation Center (Phase 3), a demonstration project of the 13th Five-Year National Key Research and Development Project "Green Building Design Methods and Key Technologies for Inheriting Lingnan Architectural Culture in the Pearl River Delta Region" (Project Number: 2017YFC0702505), and explores the working ideas and appropriate technologies of combining contemporary green technology with traditional architectural wisdom in Lingnan.展开更多
The application of green building technology can not only protect the environment in construction, achieve the purpose of ecological construction, improve the application level of green technology, but also effectivel...The application of green building technology can not only protect the environment in construction, achieve the purpose of ecological construction, improve the application level of green technology, but also effectively promote economic development. Green building technology first requires the use of environmental protection building materials, improve the utilization of resources, the application of green energy-saving construction technology, to achieve the effect of energy saving and emission reduction, green building technology is expected to achieve considerable ecological benefits. Next, the article discusses the optimization and combination of green building technology in architectural design.展开更多
In recent years, with the comprehensive advancement of urban construction, more and more high-rise buildings have been constructed. However, the rapid advancement of economic development and urban construction has mad...In recent years, with the comprehensive advancement of urban construction, more and more high-rise buildings have been constructed. However, the rapid advancement of economic development and urban construction has made the environmental crisis more severe and the number of green trees has been decreasing. In this context, people's awareness of ecological environmental protection has been significantly improved, which has also laid a good foundation for the development of forestry. Forestry is an important component of economic development, forestry planning and design and afforestation naturally have become the focus of attention in recent years. In the current situation, the forest area is shrinking, which is bound to become a common concern of the whole society. In order to bring more healthy and natural ecological environment for people, the application of forestry planning and design and afforestation technology is very important, and this paper will focus on forestry planning and design and afforestation technology to discuss the related combination strategy.展开更多
With the aggravation of the aging population in China, the number of the elderly is increasing year by year due to the negative growth of the population. Healthy old-age care has become a realistic social problem, whi...With the aggravation of the aging population in China, the number of the elderly is increasing year by year due to the negative growth of the population. Healthy old-age care has become a realistic social problem, which needs to be solved urgently. At present, the mode of combining medical care with nursing care is being gradually implemented and applied all over the world. With its traditional Chinese medicine therapy, convenient and simple operation, safe and no side effects, the appropriate technology of traditional Chinese medicine gives full play to the unique advantages of Chinese medicine, and its application in the mode of combining medical care with nursing care can provide reference for the elderly. Based on this, this paper analyzes and studies the application of appropriate technology of traditional Chinese medicine in the mode of combining medical care with nursing care for the aged.展开更多
During the test, the seed yield, Iabor efficiency, harvesting costs and eco-nomic benefits were compared and analyzed between mechanical harvesting tech-noIogy and traditional artificial harvesting technoIogy of Chine...During the test, the seed yield, Iabor efficiency, harvesting costs and eco-nomic benefits were compared and analyzed between mechanical harvesting tech-noIogy and traditional artificial harvesting technoIogy of Chinese miIk vetch seeds to studied the mechanical harvesting technoIogy and appIication effects. The resuIts showed that mechanical harvesting technoIogy increased the yield of 92.7 kg/hm2, reducing the seeds Ioss. It improved the Iabor efficiency and reduced the harvesting cost. For exampIe, a rice combine harvester was the equal of 18-20 person in the harvest quantity in one day, which directIy reduced the Iabor cost of 2 175-3 000 yuan/hm2 and increased the economic income of 3 307-4 099 yuan/hm2. So it wiI pIay an important roIe in soIving the shortage of Chinese miIk vetch seeds and ac-ceIerating the deveIopment of Chinese miIk vetch green manure crop in south China rice region.展开更多
This paper puts forward using high-pressure water jet technology to control rock burst in roadway, and analyzes the theory of controlling rock burst in roadway by the weak structure zone model. The weak structure zone...This paper puts forward using high-pressure water jet technology to control rock burst in roadway, and analyzes the theory of controlling rock burst in roadway by the weak structure zone model. The weak structure zone is formed by using high-pressure water jet to cut the coal wall in a continuous and rotational way. In order to study the influence law of weak structure zone in surrounding rock, this paper numerically analyzed the influence law of weak structure zone, and the disturbance law of coal wall and floor under dynamic and static combined load. The results show that when the distance between high-pressure water jet drillings is 3 m and the diameter of drilling is 300 mm, continuous stress superposition zone can be formed. The weak structure zone can transfer and reduce the concentrated static load in surrounding rock, and then form distressed zone. The longer the high-pressure water jet drilling is, the larger the distressed zone is. The stress change and displacement change of non-distressed zone in coal wall and floor are significantly greater than that of distressed zone under dynamic and static combined load. And it shows that the distressed zone can effectively control rock burst in roadway under dynamic and static combined load. High-pressure water jet technology was applied in the haulage gate of 250203 working face in Yanbei Coal Mine, and had gained good effect. The study conclusions provide theoretical foundation and a new guidance for controlling rock burst in roadway.展开更多
The flexibility of MIP technology to meet market demand is mainly introduced in this study. Their commercial application and technical principle are analyzed too. The MIP technology with wide feed adaptability can for...The flexibility of MIP technology to meet market demand is mainly introduced in this study. Their commercial application and technical principle are analyzed too. The MIP technology with wide feed adaptability can form a good combination with other technologies. The MIP technology has been applied extensively in China. Based on this platform, the CGP, MIP-LTG and MIP-DCR technologies have been developed, which can further improve the flexibility of MIP technology. Based on its novel reaction control technique with a sole sequential two-zone riser, the MIP users can easily switch to different operating modes between producing either more clean gasoline and propylene or diesel through changing the catalysts and varying the operating conditions. That offers MIP users with enough production flexibility and a rational production arrangement to meet the market demand. The MIP-DCR technology with less dry gas and coke yields can provide a more flexible operating mode since the catalysts to oil ratio has become an independent variable.展开更多
An combined technology of pressure pretreatment with oxygen on refractory gold ores is pointed out and discussed on this paper, according to the experiments included the test in 1 kg grade batch pressure pretreatment ...An combined technology of pressure pretreatment with oxygen on refractory gold ores is pointed out and discussed on this paper, according to the experiments included the test in 1 kg grade batch pressure pretreatment with oxygen of the concentrate from the refractory gold ores of Dongbeizhai in Sichuan province, which is called the most refractory gold ores in China. It is shown that gold recovery reach 91.73% in the combined process which is described as follows: The flotation of the sulphide gold ores is under controlled conditions, producing the concentrate for pressure pretreatment with oxygen in acidic medium and the middling for the pressure pretreatment with oxygen in alkaline medium. The thickening and washing process substitute the pressure filtration process of the pulp after pressure pretreatment. The thick slimes of the two kinds of pressure pretreatment were mixed and then enter the CIL process for simplifying the flowsheet. The possible superabundance of acid of pressure pretreatment with oxygen in acidic medium was neutralized by the tailings of flotation and the cost of neutralization will be lower. The combined technology of pressure pretreatment with oxygen has the same advantages as the normal technology of pressure pretreatment and both is helpful for environment protection.展开更多
New value systems and new aesthetic experience have been formed in the new era,triggered by reform of technical means and transformation of social economy. New multimedia technologies will produce new feelings,new exp...New value systems and new aesthetic experience have been formed in the new era,triggered by reform of technical means and transformation of social economy. New multimedia technologies will produce new feelings,new experience and new ways of thinking,which correspondingly result in changes of landscape designs. Virtual reality technology is used to build autokinetic effect and mobility of feature wall,complex structures and forms,vivid and creative landscape elements,so that the landscapes will interact with users intimately,and humanized landscape spaces will be created.展开更多
A new combined desulfurization/denitration (DeSOx/DeNOx,) process was tested in this study. The process uses the so-called powder-particle fluidized bed (PPFB) as the major reactor in which a coarse DeNOx catalyst, se...A new combined desulfurization/denitration (DeSOx/DeNOx,) process was tested in this study. The process uses the so-called powder-particle fluidized bed (PPFB) as the major reactor in which a coarse DeNOx catalyst, several hundred micrometers in size, is fluidized by flue gas as the fluidization medium particles, while a continuously supplied fine DeSOx sorbent, several to tens of micrometers in diameter, is entrained with the flue gas. Ammonia for NOx reduction is fed to the bottom of the bed, thus, SOX and NOX are simultaneously removed in the single reactor. By adopting a model gas, SO2-NO-H2O-N2-air, to simulate actual flue gas in a laboratory-scale PPFB, simultaneous SO2 and NO removals were explored with respect to various gas components of flue gas. It was found that the variations of SO2 removal with concentrations (fractions) of oxygen, water vapor, SO2 and NO in flue gas are little affected by the simultaneous NOx reduction. However, the dependencies of NO removal upon such gas components are closely related to the inter-actions between DeSOx sorbent and DeNOx catalyst.展开更多
This article presents the design and performance of a terahertz on-chip coupled-grounded coplanar waveguide(GCPW)power combiner using a 50μm-thick InP process.The proposed topology uses two coupled-GCPW lines at the ...This article presents the design and performance of a terahertz on-chip coupled-grounded coplanar waveguide(GCPW)power combiner using a 50μm-thick InP process.The proposed topology uses two coupled-GCPW lines at the end of the input port to substitute two quarter-wavelength GCPW lines,which is different from the conventional Wilkinson power combiner and can availably minimize the coverage area.According to the results obtained,for the frequency range of 210-250 GHz,the insertion losses for each two-way combiner and four-way combiner were lower than 1.05 dB and1.35 dB,respectively,and the in-band return losses were better than 11 dB.Moreover,the proposed on-chip GCPW-based combiners achieved a compromise in low-loss,broadband,and small-size,which can find wide applications in terahertz bands,such as power amplifiers and signal distribution networks.展开更多
Combined heat and power (CHP) plants (co-generation plants) using biomass as fuel, can be an interesting alternative to the predominant electrical heating in Canada. The biomass-fueled boiler provides heat for the ste...Combined heat and power (CHP) plants (co-generation plants) using biomass as fuel, can be an interesting alternative to the predominant electrical heating in Canada. The biomass-fueled boiler provides heat for the steam cycle which in turn generates electricity from the generator connected to the steam turbine. In addition, heat from the process is supplied to a district heating system. The heat can be extracted from the system in a number of ways, by using a back-pressure steam turbine, an extraction steam turbine or by extracting heat directly from the boiler. The objective of the paper is the design, modeling and simulation of such CHP plant. The plant should be sized for providing electric-ity and heat for the Anticosti Island community in Quebec.展开更多
文摘Given the increasingly notable segmentation of underground space by existing subway tunnels, it is dif- ficult to effectively and adequately develop and utilize underground space in busy parts of a city. This study presents a combined construction technology that has been developed for use in underground spaces; it includes a deformation buffer layer, a special grouting technique, jump excavation by compart- ment, back-pressure portal frame technology, a reinforcement technique, and the technology of a steel portioning drum or plate. These technologies have been successfully used in practical engineering. The combined construction technology presented in this paper provides a new method of solving key techni- cal problems in underground spaces in effectively used cross-subway tunnels. As this technology has achieved significant economic and social benefits, it has valuable future applications.
文摘The connection between all the single systems iu combined technology is analysed, and the mine engineering reliability is calculated in any area of the mines using combined technololgy system. The reliability design and distribution method in this system is put forward, thus the basis is set for the decision to raise the total production capability or the surface mines in which the combined system is used.
基金Supported by National Key Research and Development Program(2016YED0800705-01)Key Research and Development Program of Guangxi(AB16380084+2 种基金AB16380164)Scientific Research and Technological Development Program Project of Nanning City(20162105)Scientific Development Fund Project of Guangxi Academy of Agricultural Sciences(2017JM06)
文摘At present,the problem of heavy metal pollution in farmland in southern China is serious. Especially,the cadmium and lead are two heavy metal elements with serious pollution and great harm to human body. This paper reviewed some common methods and materials used in the control of cadmium and lead pollution in farmland soil. Then,it discussed the problems in the repair of cadmium and lead pollution in farmland soil. It came up with the future research direction,to provide references for remediation of lead and cadmium pollution in farmland soil.
文摘Our study group has developed a unique combined ters from the industries of dyestuff, pharmaceutical, chemical biological technology to treat high-strength organic wastewaengineering and zymolysis by using the principles of anaerobic ecological niche and bio-phase separation. The study obtained five national invention patents and eight patent equipments. This technology contains four kernel processes - two-phase anaerobic-aerobic process, hydrolysis-acidification-oxidation process, UASBAF-oxidation process, and internal cycling-hydrolysis-oxidation process. Fifteen pilot projects were accomplished in the basins of Tai Lake, Huai River, Liao River and Songhua River, and their total capital investment reached 185.214 million Yuan （RMB）. Compared to conventional wastewater treatment technology, the innovative technology is more costeffective for high-strength organic wastewater treatment, can save capital investment by 15% - 30%, lessen land usage by 20% to 40% and decrease the operating cost by 10% to 25%. The operating cost of treatment per cubic meter industrial wastewater could be below 0.6 to 1.4 Yuan （RMB）.
基金supported by the Postdoctoral Fellowship Program of CPSF (GZC20231064)China Postdoctoral Science Foundation (2024M761345)+3 种基金Guangzhou Basic and Applied Basic Research Foundation (2024A04J6615)Scientific Research Project of Southern Medical University Stomatological Hospital (PY2023004)National Key Research and Development Program of China (2021YFA0805300)National Natural Science Foundation of China (82171244,32470564)。
文摘Severe combined immunodeficiency disease(SCID),characterized by profound immune system dysfunction,can lead to life-threatening infections and death.Animal models play a pivotal role in elucidating biological processes and advancing therapeutic strategies.Recent advances in gene-editing technologies,including zincfinger nucleases(ZFNs),transcription activator-like effector nucleases(TALENs),CRISPR/Cas9,and base editing,have significantly enhanced the generation of SCID models.These models have not only deepened our understanding of disease pathophysiology but have also driven progress in cancer therapy,stem cell transplantation,organ transplantation,and infectious diseasemanagement.Thisreviewprovidesa comprehensive overview of current SCID models generated using novel gene-editing approaches,highlighting their potential applications in translational medicine and their role in advancing biomedical research.
基金Supported by Science and Technology Project of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.(YCSY2020kyA-14).
文摘Under the impetus of environmental protection policies,the discharge requirements for leachate are becoming more and more stringent.Therefore,the treatment technology of landfill leachate has become a hot research topic at present.In this paper,the chemical composition and water quality characteristics of landfill leachate were briefly introduced,and the characteristics and performance of nanofiltration technology were summarized at first.Afterwards,the recent advances in the application of nanofiltration combination technology in the treatment of landfill leachate at home and abroad were summarized,and the research and application of the combination of membrane separation,chemical coagulation,chemical oxidation and adsorption methods with nanofiltration membrane in the treatment of landfill leachate were mainly introduced.Finally,it is proposed that the combination of nanofiltration technology is feasible and economical,and its reasonable selection and optimization are the directions of future research and have good application prospects.
文摘At this stage, with the improvement of social living standards, as well as the rapid development of new science and technology, computer has become an indispensable new technology in the market economy environment and people's work and life, and the National Research on the computer industry is gradually strengthened. Driven by the computer industry, the economic benefits of various industries have been greatly improved. At present, computer-aided technology is mainly used in mechanical design and manufacturing. The application of this technology can greatly improve the work efficiency of mechanical design and manufacturing, ensure the design and manufacturing quality of various parts, meet people's demand standards, and create better development space for enterprises.The combination of computer-aided technology and mechanical design and manufacturing is an inevitable trend of the times, and also an important choice to create social and economic benefits.
文摘In order to explore the design method of combining modern green building context with green technology, this paper analyzes the design of Guangzhou Tianhe Smart City Software Park Software Industry Incubation Center (Phase 3), a demonstration project of the 13th Five-Year National Key Research and Development Project "Green Building Design Methods and Key Technologies for Inheriting Lingnan Architectural Culture in the Pearl River Delta Region" (Project Number: 2017YFC0702505), and explores the working ideas and appropriate technologies of combining contemporary green technology with traditional architectural wisdom in Lingnan.
文摘The application of green building technology can not only protect the environment in construction, achieve the purpose of ecological construction, improve the application level of green technology, but also effectively promote economic development. Green building technology first requires the use of environmental protection building materials, improve the utilization of resources, the application of green energy-saving construction technology, to achieve the effect of energy saving and emission reduction, green building technology is expected to achieve considerable ecological benefits. Next, the article discusses the optimization and combination of green building technology in architectural design.
文摘In recent years, with the comprehensive advancement of urban construction, more and more high-rise buildings have been constructed. However, the rapid advancement of economic development and urban construction has made the environmental crisis more severe and the number of green trees has been decreasing. In this context, people's awareness of ecological environmental protection has been significantly improved, which has also laid a good foundation for the development of forestry. Forestry is an important component of economic development, forestry planning and design and afforestation naturally have become the focus of attention in recent years. In the current situation, the forest area is shrinking, which is bound to become a common concern of the whole society. In order to bring more healthy and natural ecological environment for people, the application of forestry planning and design and afforestation technology is very important, and this paper will focus on forestry planning and design and afforestation technology to discuss the related combination strategy.
文摘With the aggravation of the aging population in China, the number of the elderly is increasing year by year due to the negative growth of the population. Healthy old-age care has become a realistic social problem, which needs to be solved urgently. At present, the mode of combining medical care with nursing care is being gradually implemented and applied all over the world. With its traditional Chinese medicine therapy, convenient and simple operation, safe and no side effects, the appropriate technology of traditional Chinese medicine gives full play to the unique advantages of Chinese medicine, and its application in the mode of combining medical care with nursing care can provide reference for the elderly. Based on this, this paper analyzes and studies the application of appropriate technology of traditional Chinese medicine in the mode of combining medical care with nursing care for the aged.
基金Supported by Special Fund for Agro-scientific Research in the Public Interest(201103005)National Green manure Germplasm Resources Platform(2012-019)+1 种基金Crop Germplasm Resources Conservation and Utilization Project(NB2013-2130135-34)International Plant Nutrition Institute(IPNI)Project(Hunan-16)~~
文摘During the test, the seed yield, Iabor efficiency, harvesting costs and eco-nomic benefits were compared and analyzed between mechanical harvesting tech-noIogy and traditional artificial harvesting technoIogy of Chinese miIk vetch seeds to studied the mechanical harvesting technoIogy and appIication effects. The resuIts showed that mechanical harvesting technoIogy increased the yield of 92.7 kg/hm2, reducing the seeds Ioss. It improved the Iabor efficiency and reduced the harvesting cost. For exampIe, a rice combine harvester was the equal of 18-20 person in the harvest quantity in one day, which directIy reduced the Iabor cost of 2 175-3 000 yuan/hm2 and increased the economic income of 3 307-4 099 yuan/hm2. So it wiI pIay an important roIe in soIving the shortage of Chinese miIk vetch seeds and ac-ceIerating the deveIopment of Chinese miIk vetch green manure crop in south China rice region.
基金supported by the National Natural Science Foundation of China (Nos. 51574243, 51404269)the Fundamental Research Funds for the Central Universities of China (No. 2014XT01)+1 种基金Guizhou Science and Technology Foundation of China (No. 20152072)the Priority Academic Program Development of Jiangsu Higher Education Institutions, China (No. SZBF2011-6B35)
文摘This paper puts forward using high-pressure water jet technology to control rock burst in roadway, and analyzes the theory of controlling rock burst in roadway by the weak structure zone model. The weak structure zone is formed by using high-pressure water jet to cut the coal wall in a continuous and rotational way. In order to study the influence law of weak structure zone in surrounding rock, this paper numerically analyzed the influence law of weak structure zone, and the disturbance law of coal wall and floor under dynamic and static combined load. The results show that when the distance between high-pressure water jet drillings is 3 m and the diameter of drilling is 300 mm, continuous stress superposition zone can be formed. The weak structure zone can transfer and reduce the concentrated static load in surrounding rock, and then form distressed zone. The longer the high-pressure water jet drilling is, the larger the distressed zone is. The stress change and displacement change of non-distressed zone in coal wall and floor are significantly greater than that of distressed zone under dynamic and static combined load. And it shows that the distressed zone can effectively control rock burst in roadway under dynamic and static combined load. High-pressure water jet technology was applied in the haulage gate of 250203 working face in Yanbei Coal Mine, and had gained good effect. The study conclusions provide theoretical foundation and a new guidance for controlling rock burst in roadway.
文摘The flexibility of MIP technology to meet market demand is mainly introduced in this study. Their commercial application and technical principle are analyzed too. The MIP technology with wide feed adaptability can form a good combination with other technologies. The MIP technology has been applied extensively in China. Based on this platform, the CGP, MIP-LTG and MIP-DCR technologies have been developed, which can further improve the flexibility of MIP technology. Based on its novel reaction control technique with a sole sequential two-zone riser, the MIP users can easily switch to different operating modes between producing either more clean gasoline and propylene or diesel through changing the catalysts and varying the operating conditions. That offers MIP users with enough production flexibility and a rational production arrangement to meet the market demand. The MIP-DCR technology with less dry gas and coke yields can provide a more flexible operating mode since the catalysts to oil ratio has become an independent variable.
文摘An combined technology of pressure pretreatment with oxygen on refractory gold ores is pointed out and discussed on this paper, according to the experiments included the test in 1 kg grade batch pressure pretreatment with oxygen of the concentrate from the refractory gold ores of Dongbeizhai in Sichuan province, which is called the most refractory gold ores in China. It is shown that gold recovery reach 91.73% in the combined process which is described as follows: The flotation of the sulphide gold ores is under controlled conditions, producing the concentrate for pressure pretreatment with oxygen in acidic medium and the middling for the pressure pretreatment with oxygen in alkaline medium. The thickening and washing process substitute the pressure filtration process of the pulp after pressure pretreatment. The thick slimes of the two kinds of pressure pretreatment were mixed and then enter the CIL process for simplifying the flowsheet. The possible superabundance of acid of pressure pretreatment with oxygen in acidic medium was neutralized by the tailings of flotation and the cost of neutralization will be lower. The combined technology of pressure pretreatment with oxygen has the same advantages as the normal technology of pressure pretreatment and both is helpful for environment protection.
文摘New value systems and new aesthetic experience have been formed in the new era,triggered by reform of technical means and transformation of social economy. New multimedia technologies will produce new feelings,new experience and new ways of thinking,which correspondingly result in changes of landscape designs. Virtual reality technology is used to build autokinetic effect and mobility of feature wall,complex structures and forms,vivid and creative landscape elements,so that the landscapes will interact with users intimately,and humanized landscape spaces will be created.
文摘A new combined desulfurization/denitration (DeSOx/DeNOx,) process was tested in this study. The process uses the so-called powder-particle fluidized bed (PPFB) as the major reactor in which a coarse DeNOx catalyst, several hundred micrometers in size, is fluidized by flue gas as the fluidization medium particles, while a continuously supplied fine DeSOx sorbent, several to tens of micrometers in diameter, is entrained with the flue gas. Ammonia for NOx reduction is fed to the bottom of the bed, thus, SOX and NOX are simultaneously removed in the single reactor. By adopting a model gas, SO2-NO-H2O-N2-air, to simulate actual flue gas in a laboratory-scale PPFB, simultaneous SO2 and NO removals were explored with respect to various gas components of flue gas. It was found that the variations of SO2 removal with concentrations (fractions) of oxygen, water vapor, SO2 and NO in flue gas are little affected by the simultaneous NOx reduction. However, the dependencies of NO removal upon such gas components are closely related to the inter-actions between DeSOx sorbent and DeNOx catalyst.
基金Project supported in part by the National Natural Science Foundation of China(Grant No.61871072)。
文摘This article presents the design and performance of a terahertz on-chip coupled-grounded coplanar waveguide(GCPW)power combiner using a 50μm-thick InP process.The proposed topology uses two coupled-GCPW lines at the end of the input port to substitute two quarter-wavelength GCPW lines,which is different from the conventional Wilkinson power combiner and can availably minimize the coverage area.According to the results obtained,for the frequency range of 210-250 GHz,the insertion losses for each two-way combiner and four-way combiner were lower than 1.05 dB and1.35 dB,respectively,and the in-band return losses were better than 11 dB.Moreover,the proposed on-chip GCPW-based combiners achieved a compromise in low-loss,broadband,and small-size,which can find wide applications in terahertz bands,such as power amplifiers and signal distribution networks.
文摘Combined heat and power (CHP) plants (co-generation plants) using biomass as fuel, can be an interesting alternative to the predominant electrical heating in Canada. The biomass-fueled boiler provides heat for the steam cycle which in turn generates electricity from the generator connected to the steam turbine. In addition, heat from the process is supplied to a district heating system. The heat can be extracted from the system in a number of ways, by using a back-pressure steam turbine, an extraction steam turbine or by extracting heat directly from the boiler. The objective of the paper is the design, modeling and simulation of such CHP plant. The plant should be sized for providing electric-ity and heat for the Anticosti Island community in Quebec.
