The effect of concrete strength and stiffness in engineering construction cannot be ignored. But just because of its own performance, the quality of concrete is easily affected by the surrounding environment, temperat...The effect of concrete strength and stiffness in engineering construction cannot be ignored. But just because of its own performance, the quality of concrete is easily affected by the surrounding environment, temperature and so on, which also leads to a large number of concrete cracks in water conservancy projects. On the basis of affecting the smooth progress of the project, it will also cause extremely serious personnel and economic losses. In dealing with concrete cracks, we need to form a set of specific and feasible treatment methods to effectively eliminate the concrete cracks and improve the construction and management of water conservancy projects.展开更多
High-rise buildings itself has a certain particularity, once a fire, if not handled properly, not only will cause a lot of casualties, but also cause heavy property losses. Therefore, in the process of architectural d...High-rise buildings itself has a certain particularity, once a fire, if not handled properly, not only will cause a lot of casualties, but also cause heavy property losses. Therefore, in the process of architectural design, it is necessary to carry out the fire safety engineering design work scientifically and rationally, to ensure that the fire can be extinguished quickly and effectively after the occurrence. On the basis of ensuring the safety of peoples lives and property, a sufficient number of fire-fighting equipment can be equipped in necessary places to realize effective fire fighting and reduce the economic losses of architectural design.展开更多
As a key part of promoting the stable development of China’s economy, leakage often occurs in the construction process of housing construction projects, such as exterior walls and toilets. Under the current situation...As a key part of promoting the stable development of China’s economy, leakage often occurs in the construction process of housing construction projects, such as exterior walls and toilets. Under the current situation that it can not create a good living environment for residents, it will threaten the economic benefits of construction units and the improvement of social image. Because of the leakage problem caused by various factors such as construction materials and behavior, the construction personnel must stand in the on-site construction environment, formulate a practical operation scheme in advance, and effectively complete the treatment of each leakage point, so as to improve the quality of the whole project and create a livable living environment for the general public.展开更多
In road and bridge construction, the use of concrete materials has become an important method. Although the construction and application of this concrete material has strong superiority and use value, the problem is m...In road and bridge construction, the use of concrete materials has become an important method. Although the construction and application of this concrete material has strong superiority and use value, the problem is more prominent, especially the occurrence of cracks will seriously affect the safety of roads and bridges, which must arouse people's attention. In view of the most common cracks in road and bridge construction, the main influencing factors and corresponding preventive measures are briefly analyzed and discussed.展开更多
[Objective] The aim was to screen economic and environment-friendly pesticides adaptive to aphid-resistant varieties in main rape growing regions of Yunnan Province.[Method] The effects of 6 pesticides against aphids ...[Objective] The aim was to screen economic and environment-friendly pesticides adaptive to aphid-resistant varieties in main rape growing regions of Yunnan Province.[Method] The effects of 6 pesticides against aphids on 22 Brassica campestris materials of the main breeds in Yunnan Province,the new improved varieties in China and the core breeding materials were tested.[Result] Yunyoushuang 1,Huayou 4,Yunhuayou Early-maturing Variety No.1 and A35 showed better aphid-resistance.An optimum pesticide application strategy was to use Diyaling in sowing time,and interchangeably apply nitenpyram and imidacloprid during flowering and pod formation stages.[Conclusion] The present study had provided an important technical support for sustainable development of rape industry.展开更多
Reproductive organ disease of geese is an endemic and multiple infectious disease in large-scale breeding of breeding geese, especially in anti-season production, which brings a great economic loss to goose production...Reproductive organ disease of geese is an endemic and multiple infectious disease in large-scale breeding of breeding geese, especially in anti-season production, which brings a great economic loss to goose production. To make effective prevention and control of reproductive organ disease of breeding geese under the anti-season breeding mode, the characteristics of control principles of infectious diseases of the poultry and the occurrence and prevalence of reproductive organ disease must be combined, so as to carry out scientific prevention and control.At the same time, according to the climate characteristics of summer, the feeding and management of breeding geese and water quality control should also be done well, and many corresponding measures should also be taken, thus obtaining better effect.展开更多
Due to the particularity of coal mine production, many aspects of coal mine production may have serious safety risks. If there is no corresponding safety protection, it is easy to cause various production accidents. A...Due to the particularity of coal mine production, many aspects of coal mine production may have serious safety risks. If there is no corresponding safety protection, it is easy to cause various production accidents. According to relevant production experience, harmful gas accumulation, gas explosion, coal dust explosion, fire, etc., are common accidents in coal mine production. After these accidents, mining companies will face the risk of correction and suspension of production. Therefore, if coal mining enterprises want to maintain sustainable development, they must do a good job of ventilation and defense in the long-term development process, eliminate and reduce the risk factors in coal mine production through appropriate safety management and protection, and create a relative working environment.展开更多
Kiwifruit root rot is an important root disease of kiwifruit, which has occurred increasingly in recent years. The disease leads to the death of whole kiwifruit plant under severe condition, and has become an importan...Kiwifruit root rot is an important root disease of kiwifruit, which has occurred increasingly in recent years. The disease leads to the death of whole kiwifruit plant under severe condition, and has become an important disease restricting kiwi fruit industry development. The characteris-tics, occurrence, etiology and symptoms of kiwifruit root rot were introduced in the paper, and the prevention and control technology against the dis-ease were put forward from the aspects of agriculture, biology and chemistry.展开更多
In order to actively develop green ecological strawberry, the authors have studied integrated microecological prevention and control technologies of strawberry continuous cropping diseases, including increasing soil b...In order to actively develop green ecological strawberry, the authors have studied integrated microecological prevention and control technologies of strawberry continuous cropping diseases, including increasing soil biomass and solar high temperature disinfection during strawberry greenhouse leisure period in summer, biological fertilizer (agent) treatment before colonization, root irrigation treatment with biocontrol agent, as well as appropriate amount of fulvic acid and cytex after colonization, forming a supporting technical system for the microecological prevention and control of soil-borne diseases in facilities. The demonstration application in production shows that the technology has the functions of restoring and enhancing soil biological fertility, enriching beneficial microbial flora, antagonizing harmful bacteria, significantly promoting the growth and development of strawberry, reducing the incidence of soil-borne diseases, reducing the use of chemical fertilizers and pesticides, promoting the early ripening and high yield of strawberry, significantly improving the quality and flavor of strawberry, reducing the risk of pesticide residues, and boosting consumer confidence, which further improves the economic benefit, social benefit and ecological benefit, with good application prospect in production.展开更多
SPONSOR Chinese Society of Oceanography (CSO)CO-SPONSORS State Oceanic Administration of China Chinese Association of Petroleum Equipment Ministry of Construction of China Ministry of Communications of China Ministry ...SPONSOR Chinese Society of Oceanography (CSO)CO-SPONSORS State Oceanic Administration of China Chinese Association of Petroleum Equipment Ministry of Construction of China Ministry of Communications of China Ministry of Agriculture of China Chinese Academy of Ships China International Conference Center for Science and Technology Yuanfeng Co-operative Advisory Ltd. Co展开更多
Under the background of the rapid development of science and technology, the amount of engineering construction is increasing year by year, so is geotechnical engineering. The increase of geotechnical engineering cons...Under the background of the rapid development of science and technology, the amount of engineering construction is increasing year by year, so is geotechnical engineering. The increase of geotechnical engineering construction damages the overall geological environment of our country, and even causes serious geological disasters, threatening people's property and life safety. Therefore, in order to ensure the stability and safety of construction under the current background, it is necessary to prevent geological disasters and promote the improvement of the overall level of geological disasters in China.展开更多
Agricultural production is an important link to improve farmers income level and rural living environment. Ensuring the yield and quality of crops is of great help to better meet the diversified needs of consumers. Ba...Agricultural production is an important link to improve farmers income level and rural living environment. Ensuring the yield and quality of crops is of great help to better meet the diversified needs of consumers. Based on the practical work experience, this study discusses the demonstration and application process of crop pest control technology, hoping to be helpful to the peers.展开更多
With the depletion of shallow mineral resources,mining operations are extending to greater depths and larger scales,increasing the risk of water inrush disasters,particularly from confined aquifers intersected by faul...With the depletion of shallow mineral resources,mining operations are extending to greater depths and larger scales,increasing the risk of water inrush disasters,particularly from confined aquifers intersected by faults.This paper reviews the current state of research on fault-induced water inrushes in mining faces,examining the damage characteristics and permeability of fractured floor rock,the mechanical behavior of faults under mining stress,and the mechanisms driving water inrush.Advances in prevention technologies,risk assessment,and prediction methods are also summarized.Research shows that damage evolution in fractured floor rock,coupled with fluid-solid interactions,provides the primary pathways for water inrush.Stress-seepage coupling in porous media plays a decisive role in determining inrush potential.Mining-induced stress redistribution can activate faults,with parameters such as dip angle and internal friction angle controlling stress evolution and slip.Critical triggers include the hydraulic connectivity among faults,aquifers,and mining-induced fracture networks,followed by hydraulic erosion.A multi-pronged prevention framework has been developed,integrating precise fault detection,targeted grouting for water sealing,drainage to reduce water pressure,optimized waterproof coal pillar design,and dynamic risk assessment and prediction.However,gaps remain in understanding multi-physical field coupling under deep mining conditions,establishing quantitative criteria for fault activation-induced water inrush,and refining control technologies.Future work should focus on multi-scale numerical simulations,advanced active control measures,and intelligent,integrated prevention systems to clarify the mechanisms of fault-induced water inrush and enhance theoretical and technical support for mine safety.展开更多
Coal bump refers to a sudden catastrophic failure of coal seam and usually can cause serious damages to underground mining facilities and staff. In this circumstance, this paper focuses on the recent achievements in t...Coal bump refers to a sudden catastrophic failure of coal seam and usually can cause serious damages to underground mining facilities and staff. In this circumstance, this paper focuses on the recent achievements in the mechanism and prevention techniques of coal bumps over the past five years in China.Based on theoretical analysis, laboratory experiment, numerical simulation and field test, the characteristics of coal bumps occurrence in China's coal mines were described, and the difference between coal bumps and rockbursts was also discussed. In addition, three categories of coal bumps induced by'material failure' were introduced, i.e. hard roof, floor strata and tectonic structures, in which the mechanism of coal bumps induced by geological structures was analyzed. This involves the bump liability and microstructure effects on bump-prone coal failure, the mechanism of coal bumps in response to fault reactivation, island face mining or hard roof failure. Next, the achievements in the monitoring and controlling methods of coal bumps were reviewed. These methods involve the incorporated prediction system of micro-seismicity and mining-induced pressure, the distributed micro-seismic monitoring system, energy absorption support system, bolts with constant resistance and large elongation,and the 'multi-stage' high-performance support. Finally, an optimal mining design is desirable for the purpose of coal bump mitigation.展开更多
The deterioration mechanism of thaumasite towards cement or concrete structure and the deterioration pattern of in-situ construction caused by the formation of thaumasite were studied in this paper. To improve the TSA...The deterioration mechanism of thaumasite towards cement or concrete structure and the deterioration pattern of in-situ construction caused by the formation of thaumasite were studied in this paper. To improve the TSA (the thaumasite form of sulfate attack) resistance, the cement type, water to cement ratios, the mineral admixture and the circumstance factors should be taken into consideration.展开更多
Social and economic development cannot be separated from the development and utilization of a large number of forestry resources. Forestry resources have important economic value and strategic significance and are the...Social and economic development cannot be separated from the development and utilization of a large number of forestry resources. Forestry resources have important economic value and strategic significance and are the important basic resources to ensure the sustainable development of China's economy. The quality of forestry resources directly affects the development of forestry engineering. With the advancement of artificial afforestation engineering, strengthening the prevention and control of forest diseases and insect pests is an important work to ensure the improvement of forestry economic benefits. Once forestry diseases and insect pests occur, they will bring huge economic losses to relevant engineering departments, hinder the efficient development and utilization of forestry resources, and cause damage to forestry ecological environment. The harm of forest diseases and insect pests is very great, which deeply affects the quality and yield of forest resources, causing great damage to the economic and ecological benefits of the forestry sector. Based on this, the relevant departments should take effective measures to strengthen forestry management, reduce the occurrence probability of forest diseases and insect pests, and avoid causing economic losses and ecological damage. The prevention and control of forest diseases and insect pests should adhere to the concept of scientific prevention and control, and use reasonable prevention and control techniques and methods to solve the problem of forest diseases and insect pests. This paper introduces the current situation and harms characteristics of forestry diseases and insect pests in China, and further discusses the effective prevention and control techniques and methods of forestry diseases and insect pests, which can provide reference for the prevention and control of forestry diseases and insect pests in China.展开更多
Now in the process of social development, people's awareness of environmental protection and health has been widely enhanced, and the use of chemical agents will be more strictly restricted. Therefore, according t...Now in the process of social development, people's awareness of environmental protection and health has been widely enhanced, and the use of chemical agents will be more strictly restricted. Therefore, according to the actual situation of grain storage, scientific, reasonable, environmental protection and healthy green grain storage technology should be adopted to ensure the safety of the stored grain and meet the goal of green and pollution-free. In the process of grain storage, some pests may be produced, which will have a corresponding impact on the storage effect of grain. This paper discusses the green control technology of stored grain pests, and analyzes the main development direction of stored grain in China in the future period of time, hoping to effectively improve the control level of pests to a certain extent, and smoothly reduce the use of some chemicals in the process of grain storage, so as to ensure the safety of people's use.展开更多
Hydrogen dissolved from the moisture or the wire filler is formed on the surface of welded joint due to the driving of high-energy heat source.The diffused hydrogen in the welded joint could cause hydrogen embrittleme...Hydrogen dissolved from the moisture or the wire filler is formed on the surface of welded joint due to the driving of high-energy heat source.The diffused hydrogen in the welded joint could cause hydrogen embrittlement(HE).The important factors determining the HE resistance of welded joints are microstructure style,dislocation distribution,grains characteristics,precipitate particle,and residual stress.Different welding technologies show various heat sources and heat cycles,which result in different characteristics of fusion zone and heat-affected zone.Thus,the HE fracture behavior of welded joint produced by different welded technologies differs greatly.The current stage of HE behavior of welded joint was reviewed to provide fundamental reference for the scientists and engineers engaging in welding.The appearance of hydrogen atoms in the surface or interior of welded joint could weaken the bonding strength and change the fracture mode from ductile to sudden brittle fracture.Generally,the controlling of filler wire and heat input is a practical route to obtain the excellent welded joint with high HE resistance.The inhibition of hydrogen diffusion via the formation of fine coating and the aggregation of hydrogen atoms via the control of microstructure and precipitates are the effective routes to improve HE resistance.展开更多
The hydrogeological disasters in open-pit coal mines are of great harmfulness. By analyzing the factors that lead to the hydrogeological disasters in coal mines, we can make full use of the existing technical conditio...The hydrogeological disasters in open-pit coal mines are of great harmfulness. By analyzing the factors that lead to the hydrogeological disasters in coal mines, we can make full use of the existing technical conditions, using the advanced scientific technology such as gamma ray technology, borehole perspective technology, flow logging technology and seismic exploration technology, and taking effective measures to pay attention to the work of hydrological observation in coal mines, doing well the work of coal mine hydrogeological exploration, doing well the measures of underground water prevention, combining the actual situation of open-pit coal mine, doing well the prevention work of coal mine hydrogeological disaster scientifically and reasonably, to ensure the safety of coal mine workers, to enhance the safety of coal mining operations, to promote the sustainable, healthy and stable development of our coal industry.展开更多
文摘The effect of concrete strength and stiffness in engineering construction cannot be ignored. But just because of its own performance, the quality of concrete is easily affected by the surrounding environment, temperature and so on, which also leads to a large number of concrete cracks in water conservancy projects. On the basis of affecting the smooth progress of the project, it will also cause extremely serious personnel and economic losses. In dealing with concrete cracks, we need to form a set of specific and feasible treatment methods to effectively eliminate the concrete cracks and improve the construction and management of water conservancy projects.
文摘High-rise buildings itself has a certain particularity, once a fire, if not handled properly, not only will cause a lot of casualties, but also cause heavy property losses. Therefore, in the process of architectural design, it is necessary to carry out the fire safety engineering design work scientifically and rationally, to ensure that the fire can be extinguished quickly and effectively after the occurrence. On the basis of ensuring the safety of peoples lives and property, a sufficient number of fire-fighting equipment can be equipped in necessary places to realize effective fire fighting and reduce the economic losses of architectural design.
文摘As a key part of promoting the stable development of China’s economy, leakage often occurs in the construction process of housing construction projects, such as exterior walls and toilets. Under the current situation that it can not create a good living environment for residents, it will threaten the economic benefits of construction units and the improvement of social image. Because of the leakage problem caused by various factors such as construction materials and behavior, the construction personnel must stand in the on-site construction environment, formulate a practical operation scheme in advance, and effectively complete the treatment of each leakage point, so as to improve the quality of the whole project and create a livable living environment for the general public.
文摘In road and bridge construction, the use of concrete materials has become an important method. Although the construction and application of this concrete material has strong superiority and use value, the problem is more prominent, especially the occurrence of cracks will seriously affect the safety of roads and bridges, which must arouse people's attention. In view of the most common cracks in road and bridge construction, the main influencing factors and corresponding preventive measures are briefly analyzed and discussed.
基金Supported by National Science and Technology Supporting Project (2009BADA8B01,2010BAD01B04)Kunming Comprehensive Experimental Station,National Modern Agricultural Rape Industrial Technology System(NYCYTX-00564)Development of the Yunnan Modern Agricultural Rape Industrial Technology System~~
文摘[Objective] The aim was to screen economic and environment-friendly pesticides adaptive to aphid-resistant varieties in main rape growing regions of Yunnan Province.[Method] The effects of 6 pesticides against aphids on 22 Brassica campestris materials of the main breeds in Yunnan Province,the new improved varieties in China and the core breeding materials were tested.[Result] Yunyoushuang 1,Huayou 4,Yunhuayou Early-maturing Variety No.1 and A35 showed better aphid-resistance.An optimum pesticide application strategy was to use Diyaling in sowing time,and interchangeably apply nitenpyram and imidacloprid during flowering and pod formation stages.[Conclusion] The present study had provided an important technical support for sustainable development of rape industry.
基金Supported by Agricultural Science and Technology Supporting Program of Huai'an City in Jiangsu Province(No.:SN13057)~~
文摘Reproductive organ disease of geese is an endemic and multiple infectious disease in large-scale breeding of breeding geese, especially in anti-season production, which brings a great economic loss to goose production. To make effective prevention and control of reproductive organ disease of breeding geese under the anti-season breeding mode, the characteristics of control principles of infectious diseases of the poultry and the occurrence and prevalence of reproductive organ disease must be combined, so as to carry out scientific prevention and control.At the same time, according to the climate characteristics of summer, the feeding and management of breeding geese and water quality control should also be done well, and many corresponding measures should also be taken, thus obtaining better effect.
文摘Due to the particularity of coal mine production, many aspects of coal mine production may have serious safety risks. If there is no corresponding safety protection, it is easy to cause various production accidents. According to relevant production experience, harmful gas accumulation, gas explosion, coal dust explosion, fire, etc., are common accidents in coal mine production. After these accidents, mining companies will face the risk of correction and suspension of production. Therefore, if coal mining enterprises want to maintain sustainable development, they must do a good job of ventilation and defense in the long-term development process, eliminate and reduce the risk factors in coal mine production through appropriate safety management and protection, and create a relative working environment.
基金Supported by Key Laboratory of Characteristic Fruit Resources Research and Utilization in Liupanshui(5202020170203)College Students Program of Liupanshui Normal University(LPSSY-DXS17054)
文摘Kiwifruit root rot is an important root disease of kiwifruit, which has occurred increasingly in recent years. The disease leads to the death of whole kiwifruit plant under severe condition, and has become an important disease restricting kiwi fruit industry development. The characteris-tics, occurrence, etiology and symptoms of kiwifruit root rot were introduced in the paper, and the prevention and control technology against the dis-ease were put forward from the aspects of agriculture, biology and chemistry.
基金Supported by Key Research and Development Program of Zhenjiang City(NY2020017)Independent Innovation Project of Agricultural Science and Technology of Jiangsu Province(CX[21]2019).
文摘In order to actively develop green ecological strawberry, the authors have studied integrated microecological prevention and control technologies of strawberry continuous cropping diseases, including increasing soil biomass and solar high temperature disinfection during strawberry greenhouse leisure period in summer, biological fertilizer (agent) treatment before colonization, root irrigation treatment with biocontrol agent, as well as appropriate amount of fulvic acid and cytex after colonization, forming a supporting technical system for the microecological prevention and control of soil-borne diseases in facilities. The demonstration application in production shows that the technology has the functions of restoring and enhancing soil biological fertility, enriching beneficial microbial flora, antagonizing harmful bacteria, significantly promoting the growth and development of strawberry, reducing the incidence of soil-borne diseases, reducing the use of chemical fertilizers and pesticides, promoting the early ripening and high yield of strawberry, significantly improving the quality and flavor of strawberry, reducing the risk of pesticide residues, and boosting consumer confidence, which further improves the economic benefit, social benefit and ecological benefit, with good application prospect in production.
文摘SPONSOR Chinese Society of Oceanography (CSO)CO-SPONSORS State Oceanic Administration of China Chinese Association of Petroleum Equipment Ministry of Construction of China Ministry of Communications of China Ministry of Agriculture of China Chinese Academy of Ships China International Conference Center for Science and Technology Yuanfeng Co-operative Advisory Ltd. Co
文摘Under the background of the rapid development of science and technology, the amount of engineering construction is increasing year by year, so is geotechnical engineering. The increase of geotechnical engineering construction damages the overall geological environment of our country, and even causes serious geological disasters, threatening people's property and life safety. Therefore, in order to ensure the stability and safety of construction under the current background, it is necessary to prevent geological disasters and promote the improvement of the overall level of geological disasters in China.
文摘Agricultural production is an important link to improve farmers income level and rural living environment. Ensuring the yield and quality of crops is of great help to better meet the diversified needs of consumers. Based on the practical work experience, this study discusses the demonstration and application process of crop pest control technology, hoping to be helpful to the peers.
基金supported by the Natural Science Foundation of Henan Province(242300421246)the National Natural Science Foundation of China(52004082,U24B2041,52174073,52274079)+2 种基金the Key Research and Development Program of Henan Province(251111320400)the Program for Science&Technology Innovation Talents in Universities of Henan Province(24HASTIT021)the Program for the Scientific and Technological Innovation Team in Universities of Henan Province(23IRTSTHN005).
文摘With the depletion of shallow mineral resources,mining operations are extending to greater depths and larger scales,increasing the risk of water inrush disasters,particularly from confined aquifers intersected by faults.This paper reviews the current state of research on fault-induced water inrushes in mining faces,examining the damage characteristics and permeability of fractured floor rock,the mechanical behavior of faults under mining stress,and the mechanisms driving water inrush.Advances in prevention technologies,risk assessment,and prediction methods are also summarized.Research shows that damage evolution in fractured floor rock,coupled with fluid-solid interactions,provides the primary pathways for water inrush.Stress-seepage coupling in porous media plays a decisive role in determining inrush potential.Mining-induced stress redistribution can activate faults,with parameters such as dip angle and internal friction angle controlling stress evolution and slip.Critical triggers include the hydraulic connectivity among faults,aquifers,and mining-induced fracture networks,followed by hydraulic erosion.A multi-pronged prevention framework has been developed,integrating precise fault detection,targeted grouting for water sealing,drainage to reduce water pressure,optimized waterproof coal pillar design,and dynamic risk assessment and prediction.However,gaps remain in understanding multi-physical field coupling under deep mining conditions,establishing quantitative criteria for fault activation-induced water inrush,and refining control technologies.Future work should focus on multi-scale numerical simulations,advanced active control measures,and intelligent,integrated prevention systems to clarify the mechanisms of fault-induced water inrush and enhance theoretical and technical support for mine safety.
基金supported by the National Key Research and Development Program (Grant No. 2016YFC0801401)National Natural Science Foundation of China (Grant No. 41502184)Beijing Natural Science Foundation (Grant No. 2164067)
文摘Coal bump refers to a sudden catastrophic failure of coal seam and usually can cause serious damages to underground mining facilities and staff. In this circumstance, this paper focuses on the recent achievements in the mechanism and prevention techniques of coal bumps over the past five years in China.Based on theoretical analysis, laboratory experiment, numerical simulation and field test, the characteristics of coal bumps occurrence in China's coal mines were described, and the difference between coal bumps and rockbursts was also discussed. In addition, three categories of coal bumps induced by'material failure' were introduced, i.e. hard roof, floor strata and tectonic structures, in which the mechanism of coal bumps induced by geological structures was analyzed. This involves the bump liability and microstructure effects on bump-prone coal failure, the mechanism of coal bumps in response to fault reactivation, island face mining or hard roof failure. Next, the achievements in the monitoring and controlling methods of coal bumps were reviewed. These methods involve the incorporated prediction system of micro-seismicity and mining-induced pressure, the distributed micro-seismic monitoring system, energy absorption support system, bolts with constant resistance and large elongation,and the 'multi-stage' high-performance support. Finally, an optimal mining design is desirable for the purpose of coal bump mitigation.
文摘The deterioration mechanism of thaumasite towards cement or concrete structure and the deterioration pattern of in-situ construction caused by the formation of thaumasite were studied in this paper. To improve the TSA (the thaumasite form of sulfate attack) resistance, the cement type, water to cement ratios, the mineral admixture and the circumstance factors should be taken into consideration.
文摘Social and economic development cannot be separated from the development and utilization of a large number of forestry resources. Forestry resources have important economic value and strategic significance and are the important basic resources to ensure the sustainable development of China's economy. The quality of forestry resources directly affects the development of forestry engineering. With the advancement of artificial afforestation engineering, strengthening the prevention and control of forest diseases and insect pests is an important work to ensure the improvement of forestry economic benefits. Once forestry diseases and insect pests occur, they will bring huge economic losses to relevant engineering departments, hinder the efficient development and utilization of forestry resources, and cause damage to forestry ecological environment. The harm of forest diseases and insect pests is very great, which deeply affects the quality and yield of forest resources, causing great damage to the economic and ecological benefits of the forestry sector. Based on this, the relevant departments should take effective measures to strengthen forestry management, reduce the occurrence probability of forest diseases and insect pests, and avoid causing economic losses and ecological damage. The prevention and control of forest diseases and insect pests should adhere to the concept of scientific prevention and control, and use reasonable prevention and control techniques and methods to solve the problem of forest diseases and insect pests. This paper introduces the current situation and harms characteristics of forestry diseases and insect pests in China, and further discusses the effective prevention and control techniques and methods of forestry diseases and insect pests, which can provide reference for the prevention and control of forestry diseases and insect pests in China.
文摘Now in the process of social development, people's awareness of environmental protection and health has been widely enhanced, and the use of chemical agents will be more strictly restricted. Therefore, according to the actual situation of grain storage, scientific, reasonable, environmental protection and healthy green grain storage technology should be adopted to ensure the safety of the stored grain and meet the goal of green and pollution-free. In the process of grain storage, some pests may be produced, which will have a corresponding impact on the storage effect of grain. This paper discusses the green control technology of stored grain pests, and analyzes the main development direction of stored grain in China in the future period of time, hoping to effectively improve the control level of pests to a certain extent, and smoothly reduce the use of some chemicals in the process of grain storage, so as to ensure the safety of people's use.
基金supported by Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.SJCX24_2524)National Natural Science Foundation of China(No.52005228).
文摘Hydrogen dissolved from the moisture or the wire filler is formed on the surface of welded joint due to the driving of high-energy heat source.The diffused hydrogen in the welded joint could cause hydrogen embrittlement(HE).The important factors determining the HE resistance of welded joints are microstructure style,dislocation distribution,grains characteristics,precipitate particle,and residual stress.Different welding technologies show various heat sources and heat cycles,which result in different characteristics of fusion zone and heat-affected zone.Thus,the HE fracture behavior of welded joint produced by different welded technologies differs greatly.The current stage of HE behavior of welded joint was reviewed to provide fundamental reference for the scientists and engineers engaging in welding.The appearance of hydrogen atoms in the surface or interior of welded joint could weaken the bonding strength and change the fracture mode from ductile to sudden brittle fracture.Generally,the controlling of filler wire and heat input is a practical route to obtain the excellent welded joint with high HE resistance.The inhibition of hydrogen diffusion via the formation of fine coating and the aggregation of hydrogen atoms via the control of microstructure and precipitates are the effective routes to improve HE resistance.
文摘The hydrogeological disasters in open-pit coal mines are of great harmfulness. By analyzing the factors that lead to the hydrogeological disasters in coal mines, we can make full use of the existing technical conditions, using the advanced scientific technology such as gamma ray technology, borehole perspective technology, flow logging technology and seismic exploration technology, and taking effective measures to pay attention to the work of hydrological observation in coal mines, doing well the work of coal mine hydrogeological exploration, doing well the measures of underground water prevention, combining the actual situation of open-pit coal mine, doing well the prevention work of coal mine hydrogeological disaster scientifically and reasonably, to ensure the safety of coal mine workers, to enhance the safety of coal mining operations, to promote the sustainable, healthy and stable development of our coal industry.
