In order to comply with the recommendations of the new mining code, as w</span><span style="font-family:""><span style="font-family:Verdana;">ell as to facilitate data acquis...In order to comply with the recommendations of the new mining code, as w</span><span style="font-family:""><span style="font-family:Verdana;">ell as to facilitate data acquisition and exchange, and to guarantee the reliability </span><span style="font-family:Verdana;">of these data, the Chemical Industries of Senegal (named ICS) have decided to</span><span style="font-family:Verdana;"> switch from their local terrestrial reference system to the Senegalese terrestrial reference system created in 2004 and called RRS04. This move allows ICS to take advantage of new measurement techniques such as GNSS and a more glo</span><span style="font-family:Verdana;">bal terrestrial reference system. A combination of geodesy with th</span><span style="font-family:Verdana;">e least squares method was implemented for the resolution of the problem and the optimization of the solution. For this purpose, a GNSS observation campaign </span><span style="font-family:Verdana;">was carried out on selected points. The raw data obtained were processed wi</span><span style="font-family:Verdana;">th the Leica Infinity 3.0 software before being used in our calculations for the estimation of the parameters of this passage which has many stakes for the ICS. The obtained results were then presented, applied before being checked and validated.展开更多
On 22 September 2020,within the backdrop of the COVID-19 global pandemic,China announced its climate goal for peak carbon emissions before 2030 and to reach carbon neutrality before 2060.This carbon-neutral goal is ge...On 22 September 2020,within the backdrop of the COVID-19 global pandemic,China announced its climate goal for peak carbon emissions before 2030 and to reach carbon neutrality before 2060.This carbon-neutral goal is generally considered to cover all anthropogenic greenhouse gases.The planning effort is now in full swing in China,but the pathway to decarbonization is unclear.The needed transition towards non-fossil fuel energy and its impact on China and the world may be more profound than its reform and development over the past 40 years,but the challenges are enormous.Analysis of four representative scenarios shows significant differences in achieving the carbon-neutral goal,particularly the contribution of non-fossil fuel energy sources.The high target values for nuclear,wind,and bioenergy have approached their corresponding resource limitations,with solar energy being the exception,suggesting solar’s critical role.We also found that the near-term policies that allow for a gradual transition,followed by more drastic changes after 2030,can eventually reach the carbon-neutral goal and lead to less of a reduction in cumulative emissions,thus inconsistent with the IPCC 1.5°C scenario.The challenges and prospects are discussed in the historical context of China’s socio-economic reform,globalization,international collaboration,and development.展开更多
T68 boring machine electric control system circuit is complex, its reliability and flexibility is poor with high failure rate. The mitsubishi FX2N-40MR Programmable controller for the technical innovation of electric ...T68 boring machine electric control system circuit is complex, its reliability and flexibility is poor with high failure rate. The mitsubishi FX2N-40MR Programmable controller for the technical innovation of electric control system improves the work performance of the whole electric control system and the work efficiency. This paper introduces the mitsubishi FX2N-40MR PLC in T68 boring machine electric control system, the application of the elaborated system＇s hardware and PLC program design can provide work for technical reform of similar equipment.展开更多
Navigation is the only way to develop and utilize marine resources,while the promotion of seafarers1 quality is the basic force of navigation,so navigation simulator plays an important role in modern navigation educat...Navigation is the only way to develop and utilize marine resources,while the promotion of seafarers1 quality is the basic force of navigation,so navigation simulator plays an important role in modern navigation education.The simulation research on the operation of the union purchase is important to improve the special operation training of the actual cargo handling of the union purchase.On the basis of the Cartesian coordinate system transformation algorithm,the algorithm model of the union purchase operation is constructed.On the basis of three-dimensional(3D)rendering engine technology of open scene graph(OSG),the algorithm model of finding the space coordinates of the cargo point is established.The model of catenary equation is used to optimize the scene appearance of the cargo wire.By combination of QT channel signal mechanism and OSG,the simulation interaction of the union purchase operating system is realized.By acquiring the 3D coordinate values of each point,we fit the trajectories of each point in the operation and compare the trajectories.The results show that the model has high interactivity and small error.The comparison of the states of the cargo wire before and after optimization shows that the optimized wire is more realistic and the high fidelity meets the needs of operational training and simulation systems.展开更多
In the interaction computation for 3D gravity and magnetic anomalies due to arbitrarily shaped homogenous magnetized polyhedron model composed of triangular facets, there are many difficult points, such as mass comput...In the interaction computation for 3D gravity and magnetic anomalies due to arbitrarily shaped homogenous magnetized polyhedron model composed of triangular facets, there are many difficult points, such as mass computing, absence of a mature computer technique in 3D geological body modeling, inconvenient human-computer interaction, hard program coding, etc.. Based on the formulae of the magnetic field due to horizontal regular bodies, and by applying forward theory with the three-dimensional Cartesian coordinate system transformation, the forward problems of magnetic anomalies and gradient tensors for arbitrary slantwise regular bodies were solved. It is shown that the magnetic calculating expressions of the arbitrary posture regular body are corrected by comparing results with the homogeneous polyhedral body model outcome data. Furthermore, in the same condition, the former significantly reduced forward time. Applying a new forward method of regular body expressions in arbitrary posture, developed software for interaction computation between the 3D geological body model and magnetic field has advantages of fast calculation speed, easy manipulation, etc..展开更多
China has the largest energy system in the world,with fossil energy accounting for 84%.The carbon neutrality target calls for peaking carbon emissions by 2030 and achieving net zero carbon emissions by 2060.By then,th...China has the largest energy system in the world,with fossil energy accounting for 84%.The carbon neutrality target calls for peaking carbon emissions by 2030 and achieving net zero carbon emissions by 2060.By then,the non-fossil energy will account for over 80%of China’s energy mix.Based on China’s national conditions,this paper makes scenario analysis of carbon peaking in 2030.The results of this paper indicate that the peak values of carbon emission in 2030 depends on both the development of clean energy and the growth of energy power demand.Therefore,the growth rate of the two should be balanced to control the peak carbon emission.High-quality economic growth in China in the context of carbon neutrality requires“double decoupling”,namely,decoupling GDP from the consumption of fossil energy and the growth of energy power demand as much as possible.To this end,this paper proposes a systematic solution considering both the demand and supply sides,with market-oriented measures that are workable for it.Ensuring the safe and stable supply of energy(power)is the basic principle of clean and low-carbon economic transformation,as well as a major challenge for energy system transformation.Therefore,it is necessary to develop a path for coal power decommissioning and low-carbon transformation in line with China’s national conditions.展开更多
文摘In order to comply with the recommendations of the new mining code, as w</span><span style="font-family:""><span style="font-family:Verdana;">ell as to facilitate data acquisition and exchange, and to guarantee the reliability </span><span style="font-family:Verdana;">of these data, the Chemical Industries of Senegal (named ICS) have decided to</span><span style="font-family:Verdana;"> switch from their local terrestrial reference system to the Senegalese terrestrial reference system created in 2004 and called RRS04. This move allows ICS to take advantage of new measurement techniques such as GNSS and a more glo</span><span style="font-family:Verdana;">bal terrestrial reference system. A combination of geodesy with th</span><span style="font-family:Verdana;">e least squares method was implemented for the resolution of the problem and the optimization of the solution. For this purpose, a GNSS observation campaign </span><span style="font-family:Verdana;">was carried out on selected points. The raw data obtained were processed wi</span><span style="font-family:Verdana;">th the Leica Infinity 3.0 software before being used in our calculations for the estimation of the parameters of this passage which has many stakes for the ICS. The obtained results were then presented, applied before being checked and validated.
基金supported by the National Key R&D Program of China(Grant No.2017YFB0504000).
文摘On 22 September 2020,within the backdrop of the COVID-19 global pandemic,China announced its climate goal for peak carbon emissions before 2030 and to reach carbon neutrality before 2060.This carbon-neutral goal is generally considered to cover all anthropogenic greenhouse gases.The planning effort is now in full swing in China,but the pathway to decarbonization is unclear.The needed transition towards non-fossil fuel energy and its impact on China and the world may be more profound than its reform and development over the past 40 years,but the challenges are enormous.Analysis of four representative scenarios shows significant differences in achieving the carbon-neutral goal,particularly the contribution of non-fossil fuel energy sources.The high target values for nuclear,wind,and bioenergy have approached their corresponding resource limitations,with solar energy being the exception,suggesting solar’s critical role.We also found that the near-term policies that allow for a gradual transition,followed by more drastic changes after 2030,can eventually reach the carbon-neutral goal and lead to less of a reduction in cumulative emissions,thus inconsistent with the IPCC 1.5°C scenario.The challenges and prospects are discussed in the historical context of China’s socio-economic reform,globalization,international collaboration,and development.
基金supported by Hubei Province Education Science"Twelfth Five Year Plan"2013 Annual Research Topic,No.2013B298
文摘T68 boring machine electric control system circuit is complex, its reliability and flexibility is poor with high failure rate. The mitsubishi FX2N-40MR Programmable controller for the technical innovation of electric control system improves the work performance of the whole electric control system and the work efficiency. This paper introduces the mitsubishi FX2N-40MR PLC in T68 boring machine electric control system, the application of the elaborated system＇s hardware and PLC program design can provide work for technical reform of similar equipment.
基金the National Natural Science Foundation of China(No.51579114)the Natural Science Foundation of Fujian Province(No.2018J01485)the Project of Young and Middle-Aged Teacher Education of Fujian Province(No.JAT170309)。
文摘Navigation is the only way to develop and utilize marine resources,while the promotion of seafarers1 quality is the basic force of navigation,so navigation simulator plays an important role in modern navigation education.The simulation research on the operation of the union purchase is important to improve the special operation training of the actual cargo handling of the union purchase.On the basis of the Cartesian coordinate system transformation algorithm,the algorithm model of the union purchase operation is constructed.On the basis of three-dimensional(3D)rendering engine technology of open scene graph(OSG),the algorithm model of finding the space coordinates of the cargo point is established.The model of catenary equation is used to optimize the scene appearance of the cargo wire.By combination of QT channel signal mechanism and OSG,the simulation interaction of the union purchase operating system is realized.By acquiring the 3D coordinate values of each point,we fit the trajectories of each point in the operation and compare the trajectories.The results show that the model has high interactivity and small error.The comparison of the states of the cargo wire before and after optimization shows that the optimized wire is more realistic and the high fidelity meets the needs of operational training and simulation systems.
基金supported by the National High Technology Research and Development Program of China(Nos. 2007AA06Z134, 2006AA06A201)the Program of In-troducing Talents of Discipline to Universities (No.B07011)Schlumberger-China University of Geosciences Education Fund (No.SLBX0807)
文摘In the interaction computation for 3D gravity and magnetic anomalies due to arbitrarily shaped homogenous magnetized polyhedron model composed of triangular facets, there are many difficult points, such as mass computing, absence of a mature computer technique in 3D geological body modeling, inconvenient human-computer interaction, hard program coding, etc.. Based on the formulae of the magnetic field due to horizontal regular bodies, and by applying forward theory with the three-dimensional Cartesian coordinate system transformation, the forward problems of magnetic anomalies and gradient tensors for arbitrary slantwise regular bodies were solved. It is shown that the magnetic calculating expressions of the arbitrary posture regular body are corrected by comparing results with the homogeneous polyhedral body model outcome data. Furthermore, in the same condition, the former significantly reduced forward time. Applying a new forward method of regular body expressions in arbitrary posture, developed software for interaction computation between the 3D geological body model and magnetic field has advantages of fast calculation speed, easy manipulation, etc..
基金funded by the National Natural Science Foundation of China(72133003).
文摘China has the largest energy system in the world,with fossil energy accounting for 84%.The carbon neutrality target calls for peaking carbon emissions by 2030 and achieving net zero carbon emissions by 2060.By then,the non-fossil energy will account for over 80%of China’s energy mix.Based on China’s national conditions,this paper makes scenario analysis of carbon peaking in 2030.The results of this paper indicate that the peak values of carbon emission in 2030 depends on both the development of clean energy and the growth of energy power demand.Therefore,the growth rate of the two should be balanced to control the peak carbon emission.High-quality economic growth in China in the context of carbon neutrality requires“double decoupling”,namely,decoupling GDP from the consumption of fossil energy and the growth of energy power demand as much as possible.To this end,this paper proposes a systematic solution considering both the demand and supply sides,with market-oriented measures that are workable for it.Ensuring the safe and stable supply of energy(power)is the basic principle of clean and low-carbon economic transformation,as well as a major challenge for energy system transformation.Therefore,it is necessary to develop a path for coal power decommissioning and low-carbon transformation in line with China’s national conditions.
