Register transfer level mapping (RTLM) algorithm for technology mapping at RT level is presented,which supports current design methodologies using high level design and design reuse.The mapping rules implement a sou...Register transfer level mapping (RTLM) algorithm for technology mapping at RT level is presented,which supports current design methodologies using high level design and design reuse.The mapping rules implement a source ALU using target ALU.The source ALUs and the target ALUs are all represented by the general ALUs and the mapping rules are applied in the algorithm.The mapping rules are described in a table fashion.The graph clustering algorithm is a branch and bound algorithm based on the graph formulation of the mapping algorithm.The mapping algorithm suits well mapping of regularly structured data path.Comparisons are made between the experimental results generated by 1 greedy algorithm and graphclustering algorithm,showing the feasibility of presented algorithm.展开更多
With the rapid advancement of digital and information technology,global positioning system(GPS)technology has seen increasing utilization in surveying and mapping engineering,extending its application across land,ocea...With the rapid advancement of digital and information technology,global positioning system(GPS)technology has seen increasing utilization in surveying and mapping engineering,extending its application across land,ocean,and various other domains.By analyzing the technical means of GPS in surveying and mapping engineering,understanding the characteristics and key technologies in different application environments,and exploring the application process and key technical means,accurate control can be effectively realized.Based on this,this paper mainly analyzes the specific application of GPS technology in surveying and mapping engineering technology for reference.展开更多
According to the data from the national standard classification and investigation of tourism resources(GB/T 18972-2003) in Hami region,the abundance,quality and dimensional distribution of the tourism resources in Ham...According to the data from the national standard classification and investigation of tourism resources(GB/T 18972-2003) in Hami region,the abundance,quality and dimensional distribution of the tourism resources in Hami region were evaluated based on GIS mapping technology.The evaluation results on the tourism resources in Hami region are described as follows:there are rich tourism resources categories;the quality of tourism resources is ordinary;the resources distribute equably;the number of the historical resources is much more than the natural resources,but the 1atter still has great potential for developing.All the results of the evaluation can provide important references for strategic decision making of Hami region.展开更多
In mine production, using reasonable method to complete the measurement process is helpful for subsequent mining exploration and mining design. In actual measurement, adopting diversified information and surveying and...In mine production, using reasonable method to complete the measurement process is helpful for subsequent mining exploration and mining design. In actual measurement, adopting diversified information and surveying and mapping technology is conducive to further improve the quality and precision of measurement. In this paper, the role of the impact on mine survey is introduced. Moreover, the present situation of using geographic information, surveying and mapping technology and its future development prospect are discussed.展开更多
At present, the traditional engineering measurement method has been difficult to adapt to the needs of the current information development. In order to comprehensively improve the technical level of engineering survey...At present, the traditional engineering measurement method has been difficult to adapt to the needs of the current information development. In order to comprehensively improve the technical level of engineering survey, the industry advocates the use of new surveying and mapping means to promote the high-quality development of engineering survey. Among them, digital surveying and mapping technology as an important form of new method of surveying and mapping can play a greater application value in the field of engineering surveying, and the development prospect is relatively good. In view of this, this paper mainly summarizes the practical problems of the application of digital surveying and mapping technology in mine engineering survey and the problems of measures and suggestions, in order to provide some reference value for the relevant personnel.展开更多
With the rapid development of society and economy, various industries pursue technological innovation and application, and the mine geological survey system and its survey technology are improving year by year. The di...With the rapid development of society and economy, various industries pursue technological innovation and application, and the mine geological survey system and its survey technology are improving year by year. The digital measurement technology is relatively mature at present, and is gradually applied to mine surveying projects. It can give full play to its advantages and value and lay a good foundation for the subsequent mine construction. This paper focuses on the application of digital measurement technology in mine surveying, and analyzes the construction technology and application value of digital measurement technology, so as to lay a good foundation for mining and other engineering operations in my country, and then promote the sustainable development of the mining industry. This paper will explore the application path of digital mapping technology in mine geological survey.展开更多
In recent years, China's science, technology and economy have improved in an all-round way, and the social productivity has increased significantly on the basis of the past. With the continuous development of dome...In recent years, China's science, technology and economy have improved in an all-round way, and the social productivity has increased significantly on the basis of the past. With the continuous development of domestic construction industry, there are many contradictions and problems, which are difficult to adapt to the existing engineering measurement technology. In order to improve the measurement accuracy and ensure the reliability of engineering measurement, new technology is needed. In recent years, the development of wechat technology and information system has greatly promoted the development of digital surveying and mapping technology, and many new technical means have emerged in the surveying and mapping industry.展开更多
Carrying out land and real estate survey is a prerequisite for land and real estate construction. However, land and real estate survey itself is a complex and systematic project, involving a wide range of measurement ...Carrying out land and real estate survey is a prerequisite for land and real estate construction. However, land and real estate survey itself is a complex and systematic project, involving a wide range of measurement and more content, which will lead to greater difficulty in the measurement work. In the past, people often use manual surveying and mapping to measure, which not only costs a lot of time and energy, but also is difficult to achieve good measurement results. With the rapid development of information technology in China, modern people have developed information-based surveying and mapping technology. Applying this technology to land and real estate surveying can not only improve the quality and efficiency of land and real estate surveying, but also realize the automation of land and real estate surveying and the diversification of land and real estate surveying results. At present, there are still many surveyors in our country have insufficient understanding of information-based surveying and mapping technology, which can not be well applied to land and real estate surveying. Based on this, this paper summarizes the problems related to land and real estate surveying and information-based surveying and mapping technology.展开更多
The new surveying and mapping technology is a kind of technology that automatically forms the drawing of exploration drawings by virtue of the in-depth application of new technologies. The new surveying and mapping te...The new surveying and mapping technology is a kind of technology that automatically forms the drawing of exploration drawings by virtue of the in-depth application of new technologies. The new surveying and mapping technology relies on the establishment of automatic models, which can complete the drawing of results through the automatic conversion of models after data is filled in. Using the new surveying and mapping technology can greatly shorten the drawing time, that is, after the survey is completed, the corresponding model and the traditional survey drawings and reports can be quickly generated with clear survey data. When digital geographic survey and new surveying and mapping technologies are used together, the dependence of surveying and mapping on professionals can be minimized. Based on this, the application of new surveying and mapping technology in architectural engineering survey is discussed.展开更多
With the development of modern information technology, the demand in industrial production, especially in the mining industry, has increased, which has promoted the development of the whole industry. In the whole mini...With the development of modern information technology, the demand in industrial production, especially in the mining industry, has increased, which has promoted the development of the whole industry. In the whole mining and production activities, field surveying and mapping is an important link. With the development of the Internet, the modern surveying and mapping technology has been improved to some extent. From the traditional manual mechanical measurement in the construction process, it is a modern surveying and mapping technology that uses intelligence and information technology for remote measurement and data collection, which has been improved to some extent. The application of new surveying and mapping technology in coal industry can be more convenient and fast. This paper analyzes the application of modern surveying and mapping technology and new technology in coal surveying.展开更多
Nowadays, the surveying and mapping technology used in the past can no longer meet the needs of modern engineering construction, especially with the development of the project towards a more refined direction, the acc...Nowadays, the surveying and mapping technology used in the past can no longer meet the needs of modern engineering construction, especially with the development of the project towards a more refined direction, the accuracy of the traditional surveying and mapping technology can not meet the corresponding requirements.Therefore, digital surveying and mapping technology has come into public sight. It can not only improve the work efficiency of surveying and mapping personnel, but also ensure the accuracy of data, which makes the digital surveying and mapping technology widely used at present. Therefore, in this article, we mainly discuss the application analysis of digital surveying and mapping technology in engineering surveying.展开更多
Since China entered the new era, our country pay more and more attention to the Internet information technology, our country's network information technology has been more widely spread, in surveying and mapping t...Since China entered the new era, our country pay more and more attention to the Internet information technology, our country's network information technology has been more widely spread, in surveying and mapping technology and application of a new network information technology, the application of optical remote sensing in the three-dimensional aspects of surveying and mapping, not only reduce the workload for of surveying and mapping, surveying and mapping results also makes more people to understand. Because the optical remote sensing stereo surveying and mapping technology has advanced and times, can store a lot of information, according to the needs of different people to display, so in the surveying and mapping work is deeply loved by staff. Optical remote sensing stereo mapping technology can not only build a very effective technical conditions for China's geological investigation, environmental detection work, and, because of its own advantages of optical remote sensing stereo mapping technology, to a certain extent, promote the continuous development of China's economy. In this paper, the optical remote sensing stereo mapping technology is briefly introduced, and based on the present situation, some ideas for the future development are put forward.展开更多
Surveying and mapping engineering technology in the process of real estate surveying, can provide corresponding support from the technical level, select the appropriate engineering technology, can also give full play ...Surveying and mapping engineering technology in the process of real estate surveying, can provide corresponding support from the technical level, select the appropriate engineering technology, can also give full play to the advantages and role of surveying and mapping engineering, to ensure the efficiency and accuracy of surveying and mapping engineering technology for information data acquisition.展开更多
The economic progress of the innovation and development of science and technology, surveying and mapping technology has obtained the diversified development and application. The surveying and mapping technology is gra...The economic progress of the innovation and development of science and technology, surveying and mapping technology has obtained the diversified development and application. The surveying and mapping technology is gradually in the direction of automation, intelligent and efficient. The application of new surveying and mapping technology not only make surveying and mapping simpler, but also improve the efficiency and accuracy of the staff. However, different new surveying and mapping technologies have their own advantages and disadvantages, so the use of new surveying and mapping technologies in surveying and mapping engineering needs to combine the measurement environment and the specific situation of the measuring objects to select, so as to ensure the accuracy and efficiency of the surveying and mapping effect.展开更多
Background Acute myocarditis is a disease characterized by inflammation of the heart muscle, usually caused by viral infection, autoimmune reactions, or toxins, resulting in damage and dysfunction of cardiomyocytes. I...Background Acute myocarditis is a disease characterized by inflammation of the heart muscle, usually caused by viral infection, autoimmune reactions, or toxins, resulting in damage and dysfunction of cardiomyocytes. In recent years, the incidence of acute myocarditis has gradually increased, especially in young people and athletes, which can cause serious cardiac complications and even lead to heart failure, cardiac arrest or major adverse cardiovascular events(MACEs). Methods A total of 90 patients with acute myocarditis(acute myocarditis group) and 30 healthy subjects(control group) admitted to our hospital from November 2021 to November 2023 were selected. Cardiac magnetic resonance(CMR) T1 and T2 mapping sequence scanning and cardiac function parameter measurement was performed on all subjects. The acute myocarditis group was followed up for 12 months and divided into the MACEs group and the non-MACEs group according to whether MACEs occurred. The differences in CMR parameters were analyzed, and receiver operating characteristic(ROC) curve was applied to analyze the predictive value of cardiac CMR T1 and T2 techniques for the occurrence of MACEs in patients with acute myocarditis. Results Compared with the control group, the level of left ventricular ejection fraction(LVEF) in the acute myocarditis group was significantly decreased, while left ventricular end-diastole volume(LVEDV), left ventricular endsystolic volume(LVESV), lactate dehydrogenase(LDH) and creatine kinase MB isoenzyme(CK-MB) increased significantly(P<0.05);T1 and T2 values, late gadolinium enhancement(LGE) percentage of left ventricle, left ventricular entropy and extracellular volume(ECV) in acute myocarditis group were significantly higher than those in the control group(P<0.05). Pearson correlation analysis showed that T1 and T2 values were negatively correlated with LVEF, while T1 and T2 values were positively correlated with LVESV, CK-MB, left ventricular entropy and ECV in patients with acute myocarditis(P<0.05). Among patients with acute myocarditis, the values of T1 and T2, left ventricular entropy and ECV in MACEs group were higher than those in non-MACEs group(P<0.05). Further multivariate analysis also showed that T1 and T2 values had independent predictive capacity for MACEs in patients with acute myocarditis(P<0.05). The maximum area under ROC curve was 0.894 and 0.912, and the sensitivity was 89.35% and 90.40% in patients with acute myocarditis predicted by T1 and T2 mapping. The specificity was 80.34% and 84.25%. Conclusions CMR T1 and T2 mapping techniques can effectively evaluate the cardiac function status of patients with acute myocarditis, and provide an important reference for the prognosis assessment of acute myocarditis.展开更多
Photodissociation dynamics of dichlorodifluoromethane (CF2Cl2) around 235 nm has been studied using the time-sliced velocity map imaging technology in combination with the resonance enhanced multi-photon ionization te...Photodissociation dynamics of dichlorodifluoromethane (CF2Cl2) around 235 nm has been studied using the time-sliced velocity map imaging technology in combination with the resonance enhanced multi-photon ionization technology. By measuring the raw images of chlorine atoms which are formed via one-photon dissociation of CF2Cl2, the speed and angular distributions can be directly obtained. The speed distribution of excited-state chlorine atoms consists of high translation energy (ET) and low ET components, which are related to direct dissociation on 3Q0 state and predissociation on the ground state induced by internal conversion, respectively. The speed distribution of ground-state chlorine atoms also consists of high ET and low ET components which are related to predissociation between 3Q0 and 1Q1 states and predissociation on the ground state induced by internal conversion, respectively. Radical dissociation channel is confirmed, nevertheless, secondary dissociation and three-body dissociation channels are excluded.展开更多
At present, Chinas economic strength and comprehensive national strength have been constantly improved, and various social infrastructures have been constructed and improved to a great extent, and the construction sca...At present, Chinas economic strength and comprehensive national strength have been constantly improved, and various social infrastructures have been constructed and improved to a great extent, and the construction scale of engineering projects has continued to expand. In this process, surveying and mapping engineering technology has played a very important role. However, there are still some problems and shortcomings in the actual use of surveying and mapping engineering technology. Surveying and mapping technicians should pay more attention to and understand the problems, so as to formulate scientific and effective solutions and further improve the reliability of surveying and mapping engineering technology. This paper mainly analyzes and studies the technical problems of surveying and mapping engineering and puts forward specific improvement measures, so as to provide useful reference and help for relevant personnel.展开更多
To implement the previously formulated principles of sustainable economic development, all solutions of the linear system of equations and inequalities, which are satisfied by the vector of real consumption, are compl...To implement the previously formulated principles of sustainable economic development, all solutions of the linear system of equations and inequalities, which are satisfied by the vector of real consumption, are completely described. It is established that the vector of real consumption with the minimum level of excess supply is determined by the solution of some quadratic programming problem. The necessary and sufficient conditions are established under which the economic system, described by the “input-output” production model, functions in the mode of sustainable development. A complete description of the equilibrium states for which markets are partially cleared in the economy model of production “input-output” is given, on the basis that all solutions of system of linear equations and inequalities are completely described. The existence of a family of taxation vectors in the “input-output” model of production, under which the economic system is able to function in the mode of sustainable development, is proved. Restrictions were found for the vector of taxation in the economic system, under which the economic system is able to function in the mode of sustainable development.展开更多
DAG-MAP is an FPGA technology mapping algorithm for delay optimization and the labeling phase is the algorithm’s kernel. This paper studied the labeling phase and presented an improved labeling method. It is shown th...DAG-MAP is an FPGA technology mapping algorithm for delay optimization and the labeling phase is the algorithm’s kernel. This paper studied the labeling phase and presented an improved labeling method. It is shown through the experimental results on MCNC benchmarks that the improved method is more effective than the original method while the computation time is almost the same.展开更多
The hot deformation characteristics of GH738 superalloy over the temperature range of 1000 °C to 1 200 °C and strain range of 0.01 s^-1 to 10.0 s^-1 under a strain of 1.0 s^-1 were investigated through hot c...The hot deformation characteristics of GH738 superalloy over the temperature range of 1000 °C to 1 200 °C and strain range of 0.01 s^-1 to 10.0 s^-1 under a strain of 1.0 s^-1 were investigated through hot compression tests with a Gleeble-1500 simulation machine. The flow stress reached peak value before flow softening occurred. The average apparent activation energy（Q） of GH738 was calculated to be 430 k J/mol, and the stress index（n） is approximately 4.08. The processing map was developed based on flow stress data and dynamic materials model（DMM）. The map shows a dynamic recrystallization（DRX） domain in 1 050 °C to 1150 °C and 0.01 s^-1 to 1.0 s^-1 strain rate range with a peak efficiency of 45%, which is considered to be the optimum region for hot working. Moreover, the materials undergo flow instability in the temperature range of 1000 °C to 1050 °C and strain range of 1.0 s^-1 to 10.0 s^-1, and adiabatic shear bands can be observed in this domain.展开更多
文摘Register transfer level mapping (RTLM) algorithm for technology mapping at RT level is presented,which supports current design methodologies using high level design and design reuse.The mapping rules implement a source ALU using target ALU.The source ALUs and the target ALUs are all represented by the general ALUs and the mapping rules are applied in the algorithm.The mapping rules are described in a table fashion.The graph clustering algorithm is a branch and bound algorithm based on the graph formulation of the mapping algorithm.The mapping algorithm suits well mapping of regularly structured data path.Comparisons are made between the experimental results generated by 1 greedy algorithm and graphclustering algorithm,showing the feasibility of presented algorithm.
文摘With the rapid advancement of digital and information technology,global positioning system(GPS)technology has seen increasing utilization in surveying and mapping engineering,extending its application across land,ocean,and various other domains.By analyzing the technical means of GPS in surveying and mapping engineering,understanding the characteristics and key technologies in different application environments,and exploring the application process and key technical means,accurate control can be effectively realized.Based on this,this paper mainly analyzes the specific application of GPS technology in surveying and mapping engineering technology for reference.
基金supported by "211" Key Discipline Construction Project of Shihezi University
文摘According to the data from the national standard classification and investigation of tourism resources(GB/T 18972-2003) in Hami region,the abundance,quality and dimensional distribution of the tourism resources in Hami region were evaluated based on GIS mapping technology.The evaluation results on the tourism resources in Hami region are described as follows:there are rich tourism resources categories;the quality of tourism resources is ordinary;the resources distribute equably;the number of the historical resources is much more than the natural resources,but the 1atter still has great potential for developing.All the results of the evaluation can provide important references for strategic decision making of Hami region.
文摘In mine production, using reasonable method to complete the measurement process is helpful for subsequent mining exploration and mining design. In actual measurement, adopting diversified information and surveying and mapping technology is conducive to further improve the quality and precision of measurement. In this paper, the role of the impact on mine survey is introduced. Moreover, the present situation of using geographic information, surveying and mapping technology and its future development prospect are discussed.
文摘At present, the traditional engineering measurement method has been difficult to adapt to the needs of the current information development. In order to comprehensively improve the technical level of engineering survey, the industry advocates the use of new surveying and mapping means to promote the high-quality development of engineering survey. Among them, digital surveying and mapping technology as an important form of new method of surveying and mapping can play a greater application value in the field of engineering surveying, and the development prospect is relatively good. In view of this, this paper mainly summarizes the practical problems of the application of digital surveying and mapping technology in mine engineering survey and the problems of measures and suggestions, in order to provide some reference value for the relevant personnel.
文摘With the rapid development of society and economy, various industries pursue technological innovation and application, and the mine geological survey system and its survey technology are improving year by year. The digital measurement technology is relatively mature at present, and is gradually applied to mine surveying projects. It can give full play to its advantages and value and lay a good foundation for the subsequent mine construction. This paper focuses on the application of digital measurement technology in mine surveying, and analyzes the construction technology and application value of digital measurement technology, so as to lay a good foundation for mining and other engineering operations in my country, and then promote the sustainable development of the mining industry. This paper will explore the application path of digital mapping technology in mine geological survey.
文摘In recent years, China's science, technology and economy have improved in an all-round way, and the social productivity has increased significantly on the basis of the past. With the continuous development of domestic construction industry, there are many contradictions and problems, which are difficult to adapt to the existing engineering measurement technology. In order to improve the measurement accuracy and ensure the reliability of engineering measurement, new technology is needed. In recent years, the development of wechat technology and information system has greatly promoted the development of digital surveying and mapping technology, and many new technical means have emerged in the surveying and mapping industry.
文摘Carrying out land and real estate survey is a prerequisite for land and real estate construction. However, land and real estate survey itself is a complex and systematic project, involving a wide range of measurement and more content, which will lead to greater difficulty in the measurement work. In the past, people often use manual surveying and mapping to measure, which not only costs a lot of time and energy, but also is difficult to achieve good measurement results. With the rapid development of information technology in China, modern people have developed information-based surveying and mapping technology. Applying this technology to land and real estate surveying can not only improve the quality and efficiency of land and real estate surveying, but also realize the automation of land and real estate surveying and the diversification of land and real estate surveying results. At present, there are still many surveyors in our country have insufficient understanding of information-based surveying and mapping technology, which can not be well applied to land and real estate surveying. Based on this, this paper summarizes the problems related to land and real estate surveying and information-based surveying and mapping technology.
文摘The new surveying and mapping technology is a kind of technology that automatically forms the drawing of exploration drawings by virtue of the in-depth application of new technologies. The new surveying and mapping technology relies on the establishment of automatic models, which can complete the drawing of results through the automatic conversion of models after data is filled in. Using the new surveying and mapping technology can greatly shorten the drawing time, that is, after the survey is completed, the corresponding model and the traditional survey drawings and reports can be quickly generated with clear survey data. When digital geographic survey and new surveying and mapping technologies are used together, the dependence of surveying and mapping on professionals can be minimized. Based on this, the application of new surveying and mapping technology in architectural engineering survey is discussed.
文摘With the development of modern information technology, the demand in industrial production, especially in the mining industry, has increased, which has promoted the development of the whole industry. In the whole mining and production activities, field surveying and mapping is an important link. With the development of the Internet, the modern surveying and mapping technology has been improved to some extent. From the traditional manual mechanical measurement in the construction process, it is a modern surveying and mapping technology that uses intelligence and information technology for remote measurement and data collection, which has been improved to some extent. The application of new surveying and mapping technology in coal industry can be more convenient and fast. This paper analyzes the application of modern surveying and mapping technology and new technology in coal surveying.
文摘Nowadays, the surveying and mapping technology used in the past can no longer meet the needs of modern engineering construction, especially with the development of the project towards a more refined direction, the accuracy of the traditional surveying and mapping technology can not meet the corresponding requirements.Therefore, digital surveying and mapping technology has come into public sight. It can not only improve the work efficiency of surveying and mapping personnel, but also ensure the accuracy of data, which makes the digital surveying and mapping technology widely used at present. Therefore, in this article, we mainly discuss the application analysis of digital surveying and mapping technology in engineering surveying.
文摘Since China entered the new era, our country pay more and more attention to the Internet information technology, our country's network information technology has been more widely spread, in surveying and mapping technology and application of a new network information technology, the application of optical remote sensing in the three-dimensional aspects of surveying and mapping, not only reduce the workload for of surveying and mapping, surveying and mapping results also makes more people to understand. Because the optical remote sensing stereo surveying and mapping technology has advanced and times, can store a lot of information, according to the needs of different people to display, so in the surveying and mapping work is deeply loved by staff. Optical remote sensing stereo mapping technology can not only build a very effective technical conditions for China's geological investigation, environmental detection work, and, because of its own advantages of optical remote sensing stereo mapping technology, to a certain extent, promote the continuous development of China's economy. In this paper, the optical remote sensing stereo mapping technology is briefly introduced, and based on the present situation, some ideas for the future development are put forward.
文摘Surveying and mapping engineering technology in the process of real estate surveying, can provide corresponding support from the technical level, select the appropriate engineering technology, can also give full play to the advantages and role of surveying and mapping engineering, to ensure the efficiency and accuracy of surveying and mapping engineering technology for information data acquisition.
文摘The economic progress of the innovation and development of science and technology, surveying and mapping technology has obtained the diversified development and application. The surveying and mapping technology is gradually in the direction of automation, intelligent and efficient. The application of new surveying and mapping technology not only make surveying and mapping simpler, but also improve the efficiency and accuracy of the staff. However, different new surveying and mapping technologies have their own advantages and disadvantages, so the use of new surveying and mapping technologies in surveying and mapping engineering needs to combine the measurement environment and the specific situation of the measuring objects to select, so as to ensure the accuracy and efficiency of the surveying and mapping effect.
文摘Background Acute myocarditis is a disease characterized by inflammation of the heart muscle, usually caused by viral infection, autoimmune reactions, or toxins, resulting in damage and dysfunction of cardiomyocytes. In recent years, the incidence of acute myocarditis has gradually increased, especially in young people and athletes, which can cause serious cardiac complications and even lead to heart failure, cardiac arrest or major adverse cardiovascular events(MACEs). Methods A total of 90 patients with acute myocarditis(acute myocarditis group) and 30 healthy subjects(control group) admitted to our hospital from November 2021 to November 2023 were selected. Cardiac magnetic resonance(CMR) T1 and T2 mapping sequence scanning and cardiac function parameter measurement was performed on all subjects. The acute myocarditis group was followed up for 12 months and divided into the MACEs group and the non-MACEs group according to whether MACEs occurred. The differences in CMR parameters were analyzed, and receiver operating characteristic(ROC) curve was applied to analyze the predictive value of cardiac CMR T1 and T2 techniques for the occurrence of MACEs in patients with acute myocarditis. Results Compared with the control group, the level of left ventricular ejection fraction(LVEF) in the acute myocarditis group was significantly decreased, while left ventricular end-diastole volume(LVEDV), left ventricular endsystolic volume(LVESV), lactate dehydrogenase(LDH) and creatine kinase MB isoenzyme(CK-MB) increased significantly(P<0.05);T1 and T2 values, late gadolinium enhancement(LGE) percentage of left ventricle, left ventricular entropy and extracellular volume(ECV) in acute myocarditis group were significantly higher than those in the control group(P<0.05). Pearson correlation analysis showed that T1 and T2 values were negatively correlated with LVEF, while T1 and T2 values were positively correlated with LVESV, CK-MB, left ventricular entropy and ECV in patients with acute myocarditis(P<0.05). Among patients with acute myocarditis, the values of T1 and T2, left ventricular entropy and ECV in MACEs group were higher than those in non-MACEs group(P<0.05). Further multivariate analysis also showed that T1 and T2 values had independent predictive capacity for MACEs in patients with acute myocarditis(P<0.05). The maximum area under ROC curve was 0.894 and 0.912, and the sensitivity was 89.35% and 90.40% in patients with acute myocarditis predicted by T1 and T2 mapping. The specificity was 80.34% and 84.25%. Conclusions CMR T1 and T2 mapping techniques can effectively evaluate the cardiac function status of patients with acute myocarditis, and provide an important reference for the prognosis assessment of acute myocarditis.
基金supported by the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No.17KJB150005 and No.17KJD510001)the Natural Science Foundation of Changzhou Institute of Technology (No.YN1507 and No.YN1611)+1 种基金Undergraduate Training Program for Innovation of Changzhou Institute of Technology (No.2017276Y)the National Natural Science Foundation of China (No.21273212)
文摘Photodissociation dynamics of dichlorodifluoromethane (CF2Cl2) around 235 nm has been studied using the time-sliced velocity map imaging technology in combination with the resonance enhanced multi-photon ionization technology. By measuring the raw images of chlorine atoms which are formed via one-photon dissociation of CF2Cl2, the speed and angular distributions can be directly obtained. The speed distribution of excited-state chlorine atoms consists of high translation energy (ET) and low ET components, which are related to direct dissociation on 3Q0 state and predissociation on the ground state induced by internal conversion, respectively. The speed distribution of ground-state chlorine atoms also consists of high ET and low ET components which are related to predissociation between 3Q0 and 1Q1 states and predissociation on the ground state induced by internal conversion, respectively. Radical dissociation channel is confirmed, nevertheless, secondary dissociation and three-body dissociation channels are excluded.
文摘At present, Chinas economic strength and comprehensive national strength have been constantly improved, and various social infrastructures have been constructed and improved to a great extent, and the construction scale of engineering projects has continued to expand. In this process, surveying and mapping engineering technology has played a very important role. However, there are still some problems and shortcomings in the actual use of surveying and mapping engineering technology. Surveying and mapping technicians should pay more attention to and understand the problems, so as to formulate scientific and effective solutions and further improve the reliability of surveying and mapping engineering technology. This paper mainly analyzes and studies the technical problems of surveying and mapping engineering and puts forward specific improvement measures, so as to provide useful reference and help for relevant personnel.
文摘To implement the previously formulated principles of sustainable economic development, all solutions of the linear system of equations and inequalities, which are satisfied by the vector of real consumption, are completely described. It is established that the vector of real consumption with the minimum level of excess supply is determined by the solution of some quadratic programming problem. The necessary and sufficient conditions are established under which the economic system, described by the “input-output” production model, functions in the mode of sustainable development. A complete description of the equilibrium states for which markets are partially cleared in the economy model of production “input-output” is given, on the basis that all solutions of system of linear equations and inequalities are completely described. The existence of a family of taxation vectors in the “input-output” model of production, under which the economic system is able to function in the mode of sustainable development, is proved. Restrictions were found for the vector of taxation in the economic system, under which the economic system is able to function in the mode of sustainable development.
文摘DAG-MAP is an FPGA technology mapping algorithm for delay optimization and the labeling phase is the algorithm’s kernel. This paper studied the labeling phase and presented an improved labeling method. It is shown through the experimental results on MCNC benchmarks that the improved method is more effective than the original method while the computation time is almost the same.
基金Item Sponsored by National High Technology Research and Development Program(863 Program)of China(2012AA03A502)
文摘The hot deformation characteristics of GH738 superalloy over the temperature range of 1000 °C to 1 200 °C and strain range of 0.01 s^-1 to 10.0 s^-1 under a strain of 1.0 s^-1 were investigated through hot compression tests with a Gleeble-1500 simulation machine. The flow stress reached peak value before flow softening occurred. The average apparent activation energy（Q） of GH738 was calculated to be 430 k J/mol, and the stress index（n） is approximately 4.08. The processing map was developed based on flow stress data and dynamic materials model（DMM）. The map shows a dynamic recrystallization（DRX） domain in 1 050 °C to 1150 °C and 0.01 s^-1 to 1.0 s^-1 strain rate range with a peak efficiency of 45%, which is considered to be the optimum region for hot working. Moreover, the materials undergo flow instability in the temperature range of 1000 °C to 1050 °C and strain range of 1.0 s^-1 to 10.0 s^-1, and adiabatic shear bands can be observed in this domain.
