Referring to corn breeding literature at home and abroad,the possible ways to improve the efficiency of maize breeding were discussed.The results showed that through the summary and reflection on breeding objectives a...Referring to corn breeding literature at home and abroad,the possible ways to improve the efficiency of maize breeding were discussed.The results showed that through the summary and reflection on breeding objectives and strategies,and improvement and optimization of breeding techniques and methods,as well as adjustment and simplification of experimental design and implementation,the breeding cost would be greatly reduced,and the breeding efficiency would be improved.展开更多
Optimization of antenna array pattern used in a spaceborne Synthetic Aperture Radar (SAR) system is considered in this study. A robust evolutionary algorithm, Non-dominated Sorting Genetic Algorithms (the improved NS...Optimization of antenna array pattern used in a spaceborne Synthetic Aperture Radar (SAR) system is considered in this study. A robust evolutionary algorithm, Non-dominated Sorting Genetic Algorithms (the improved NSGA-Ⅱ), is applied on a spaceborne SAR antenna pattern design. The system consists of two objective functions with two constraints. Pareto fronts are generated as a result of multi-objective optimization. After being validated by a test problem ZDT4, the algorithms are used to synthesize spaceborne SAR antenna radiation pattern. The good results with low Ambi- guity-to-Signal Ratio (ASR) and high directivity are obtained in the paper.展开更多
With the fast development of science and technology, English is becoming more and more important. Concerning English learning, we should focus our attention on listening, speaking, reading, writing and translating. Co...With the fast development of science and technology, English is becoming more and more important. Concerning English learning, we should focus our attention on listening, speaking, reading, writing and translating. Comparatively speaking, listening and speaking skills are more practical. But how to improve these skills? Everyone knows that the only effective way to improve language skills is to use the language. In reality, however, we know that there are many reasons why people don’t want to speak in another language——they are afraid of making mistakes, they can’t express their real meaning easily, they are shy, they are afraid people will laugh at them. We feel this way sometimes, but if you are sure that you really want to improve your English, try some of the suggestions that have been made here.展开更多
Improving the ability of innovation and Entrepreneurship of impoverished college students in local colleges and universities could alleviate employment pressure to a certain extent, solve employment difficulties and h...Improving the ability of innovation and Entrepreneurship of impoverished college students in local colleges and universities could alleviate employment pressure to a certain extent, solve employment difficulties and help college students realize their self-worth, which are related to social stability and economic development. By using the methods of questionnaire and individual interviews, this paper investigates some of the students who set up files for poverty alleviation in northwest local colleges and universities, and understand the current situation of innovation and Entrepreneurship of poor college students. It is hoped that the ability of innovation and entrepreneurship can be improved by enhancing the awareness of innovation and entrepreneurship, improving the education system, innovating learning mode, building a practical platform and implementing quality management.展开更多
The improvement on the calculation of anti-Stokes energy transfer rate is studied in the present work. The additional proportion coefficient between Stokes and anti-Stokes light intensities of quantum Raman scattering...The improvement on the calculation of anti-Stokes energy transfer rate is studied in the present work. The additional proportion coefficient between Stokes and anti-Stokes light intensities of quantum Raman scattering theory as compared with the classical Raman theory is introduced to successfully describe the anti-Stokes energy transfer. The theoretical formula for the improvement on the calculation of anti-Stokes energy transfer rate is derived for the first time in this study. The correctness of introducing coefficient exp{△E/kT} from well-known Raman scatter theory is demonstrated also. Moreover, the experimental lifetime measurement in Er0.01YbxY1-0.01-xVO4 crystal is performed to justify the validity of our important improvement in the original phonon-assisted energy transfer theory for the first time.展开更多
Many of the Chinese primary school students often ask such a question,'I can read and usually understand the English I read,but why can’t I follow the English speakers or the recording of English most of the time...Many of the Chinese primary school students often ask such a question,'I can read and usually understand the English I read,but why can’t I follow the English speakers or the recording of English most of the time?'The answer is that you are an English learner,not an English language native speaker.Since you can usually understand the English you read,you are very good at languages.展开更多
Since her daughters were young , Rachel Stafford has tried a "hands free " appro ach to parenting — putting dow n her c ell phone and the pressures and _ that com e with it and attempting ...Since her daughters were young , Rachel Stafford has tried a "hands free " appro ach to parenting — putting dow n her c ell phone and the pressures and _ that com e with it and attempting to be more _ with her kids.展开更多
In this paper, a new method of topological cleanup for quadrilateral mesh is presented. The method first selects a patch of mesh around an irregular node. It then seeks the best connection of the selected patch accord...In this paper, a new method of topological cleanup for quadrilateral mesh is presented. The method first selects a patch of mesh around an irregular node. It then seeks the best connection of the selected patch according to its irregular valence using a new topological operation： small polygon reconnection （SPR）. By replacing the original patch with an optimal one that has less irregular valence, mesh quality can be improved. Three applications based on the proposed approach are enumerated： （1） improving the quality of a quadrilateral mesh, （2） converting a triangular mesh to a quadrilateral one, and （3） adapting a triangle generator to a quadrilateral one. The presented method is highly effective in all three applications.展开更多
La2O3 is a combustion improver suitable for burning pulverized coal in blast furnace. La2O3 forms the active species La3＋（CO-）3 that weakens the bridge adhesion of carbon structural units and alters the lattice str...La2O3 is a combustion improver suitable for burning pulverized coal in blast furnace. La2O3 forms the active species La3＋（CO-）3 that weakens the bridge adhesion of carbon structural units and alters the lattice structures, thus reducing the activation energy of the pulverized coal and accelerating the burning process. Research shows that La2O3 can form the active species La3＋（CO-）3, which weakens the bridge adhesion of carbon structural units and alters the lattice structures of the fixed carbon, hence decreasing the activation energy of the pulverized coal and accelerating the burning process.展开更多
For the college students, the instructors are the guides and helpers of the healthy growth of them, who play an important role in their establishment of a correct outlook on life, and values, and the cultivation of th...For the college students, the instructors are the guides and helpers of the healthy growth of them, who play an important role in their establishment of a correct outlook on life, and values, and the cultivation of the good moral qualities. At present, in the team of the college counselors, there exist the problems that the responsibilities are fuzzy, and their own qualities need to be improved, and the construction of the occupation is slow, and so on, which require that we should recognize the positioning of the counselors＇ occupational role, and focus on the enhancement of the abilities of the counselors. Therefore, this paper puts forward the path to improve the abilities of the role of the counselors, in order to speed up the construction of the professionalism and specialization of the team of the college counselors, making them more capable of supporting the growth of the physical and mental health of the college students.展开更多
BVRI CCD photometry of the poorly studied open cluster NGC 6724 has been carried out down to a limiting magnitude of V-20 mag. The stars of the cluster have been observed using the Newtonian focus （f/4.84） of the 74...BVRI CCD photometry of the poorly studied open cluster NGC 6724 has been carried out down to a limiting magnitude of V-20 mag. The stars of the cluster have been observed using the Newtonian focus （f/4.84） of the 74-inch telescope at Kottamia Astronomical Observatory in Egypt. Also, the 2MASS - JHK system is used to confirm the results we obtained. The main photometric parameters have been estimated for the present object; the diameter is found to be 6 arcmin, the distance is 15304-60pc from the Sun and the age is 900＋50Myr. The optical reddening E（B - V） = 0.65 mag, while the infrared reddening is E（J - H） = 0.20 mag. The slope of the mass function distribution and the relaxation time estimations indicate that cluster NGC 6724 is dynamically relaxed.展开更多
Tornadoes can destroy or severely damage physical infrastructure including buildings in a community.This can result in direct losses but also indirect losses such as the closure of key social institutions reverberatin...Tornadoes can destroy or severely damage physical infrastructure including buildings in a community.This can result in direct losses but also indirect losses such as the closure of key social institutions reverberating further through the community(e.g.,schools).Despite significant losses in past events,building codes and standards have not previously included tornado hazards because of the relatively low probability of a direct strike.The recent release of the ASCE 7-22 standard considers tornadoes for Risk Category 3 and 4 buildings,i.e.ranging from schools to critical facilities.This study proposes a series of design combinations of a reinforced masonry school building with different performance targets intended to enable schools to reopen sooner.Tornado fragilities were developed for a school building having improved designs using tornado loads determined based on the new tornado chapter in ASCE 7-22,and then integrated into a community level model with school attendance zones to examine the effect.The ultimate goal in this study is to investigate the effect of improving school building designs would have on maintaining school continuity(and more rapid return)for school children.展开更多
We describe the target selection algorithm for the low latitude disk por- tion of the LAMOST Pilot Survey, which aims to test systems in preparation for the LAMOST spectroscopic survey. We use the PPMXL astrometric ca...We describe the target selection algorithm for the low latitude disk por- tion of the LAMOST Pilot Survey, which aims to test systems in preparation for the LAMOST spectroscopic survey. We use the PPMXL astrometric catalog, which provides positions, proper motions, B/R/I magnitudes （mostly） from USNO-B and d/H/Ks from the Two Micron All Sky Survey （2MASS） as well. We chose eight plates along the Galactic plane, in the region 0° 〈 α° 〈 67° and 42° 〈 δ 〈 59°, which cover 22 known open clusters with a range of ages. Adjacent plates may have some small overlapping area. Each plate covers an area of 2.5° in radius, with its cen- tral star （for the Shack-Hartmann guider） brighter than 8th magnitude. For each plate, we create an input catalog in the magnitude range 11.3 〈 Imag 〈 16.3 and Bmag available from PPMXL. The stars are selected to satisfy the requirements of the fiber positioning system and have a uniform distribution in the I vs. B - I color-magnitude diagram. Our final input catalog consists of 12 000 objects on each of eight plates that are observable during the winter observing season from the Xinglong Station of the National Astronomical Observatory of China.展开更多
IN the early mornings people can be found exercising all over Shuangyushu Park. Some practice qi gong; some walk their caged songbirds; others come to perfect their ballroom dancing skills. Of all of these early riser...IN the early mornings people can be found exercising all over Shuangyushu Park. Some practice qi gong; some walk their caged songbirds; others come to perfect their ballroom dancing skills. Of all of these early risers, the groups of elderly and middle-aged women dancing with fans and swords immediately catch the eye. The sword dancers display a beautiful combination of rigidity and flexibility. The fan dancers perform with展开更多
In this paper, we construct two models for the searching task for a lost plane. Model 1 determines the searching area. We predict the trajectory of floats generated after the disintegration of the plane by using RBF n...In this paper, we construct two models for the searching task for a lost plane. Model 1 determines the searching area. We predict the trajectory of floats generated after the disintegration of the plane by using RBF neural network model, and then determine the searching area according to the trajectory. With the pass of time, the searching area will also be constantly moving along the trajectory. Model 2 develops a maritime search plan to achieve the purpose of completing the search in the shortest time. We optimize the searching time and transform the problem into the 0-1 knapsack problem. Solving this problem by improved genetic algorithm, we can get the shortest searching time and the best choice for the search power.展开更多
基金Supported by National Science and Technology Support Program(2007BAD69B05)~~
文摘Referring to corn breeding literature at home and abroad,the possible ways to improve the efficiency of maize breeding were discussed.The results showed that through the summary and reflection on breeding objectives and strategies,and improvement and optimization of breeding techniques and methods,as well as adjustment and simplification of experimental design and implementation,the breeding cost would be greatly reduced,and the breeding efficiency would be improved.
文摘Optimization of antenna array pattern used in a spaceborne Synthetic Aperture Radar (SAR) system is considered in this study. A robust evolutionary algorithm, Non-dominated Sorting Genetic Algorithms (the improved NSGA-Ⅱ), is applied on a spaceborne SAR antenna pattern design. The system consists of two objective functions with two constraints. Pareto fronts are generated as a result of multi-objective optimization. After being validated by a test problem ZDT4, the algorithms are used to synthesize spaceborne SAR antenna radiation pattern. The good results with low Ambi- guity-to-Signal Ratio (ASR) and high directivity are obtained in the paper.
文摘With the fast development of science and technology, English is becoming more and more important. Concerning English learning, we should focus our attention on listening, speaking, reading, writing and translating. Comparatively speaking, listening and speaking skills are more practical. But how to improve these skills? Everyone knows that the only effective way to improve language skills is to use the language. In reality, however, we know that there are many reasons why people don’t want to speak in another language——they are afraid of making mistakes, they can’t express their real meaning easily, they are shy, they are afraid people will laugh at them. We feel this way sometimes, but if you are sure that you really want to improve your English, try some of the suggestions that have been made here.
文摘Improving the ability of innovation and Entrepreneurship of impoverished college students in local colleges and universities could alleviate employment pressure to a certain extent, solve employment difficulties and help college students realize their self-worth, which are related to social stability and economic development. By using the methods of questionnaire and individual interviews, this paper investigates some of the students who set up files for poverty alleviation in northwest local colleges and universities, and understand the current situation of innovation and Entrepreneurship of poor college students. It is hoped that the ability of innovation and entrepreneurship can be improved by enhancing the awareness of innovation and entrepreneurship, improving the education system, innovating learning mode, building a practical platform and implementing quality management.
基金supported by the National Natural Science Foundation of China (Grant No.10674019)
文摘The improvement on the calculation of anti-Stokes energy transfer rate is studied in the present work. The additional proportion coefficient between Stokes and anti-Stokes light intensities of quantum Raman scattering theory as compared with the classical Raman theory is introduced to successfully describe the anti-Stokes energy transfer. The theoretical formula for the improvement on the calculation of anti-Stokes energy transfer rate is derived for the first time in this study. The correctness of introducing coefficient exp{△E/kT} from well-known Raman scatter theory is demonstrated also. Moreover, the experimental lifetime measurement in Er0.01YbxY1-0.01-xVO4 crystal is performed to justify the validity of our important improvement in the original phonon-assisted energy transfer theory for the first time.
文摘Many of the Chinese primary school students often ask such a question,'I can read and usually understand the English I read,but why can’t I follow the English speakers or the recording of English most of the time?'The answer is that you are an English learner,not an English language native speaker.Since you can usually understand the English you read,you are very good at languages.
文摘Since her daughters were young , Rachel Stafford has tried a "hands free " appro ach to parenting — putting dow n her c ell phone and the pressures and _ that com e with it and attempting to be more _ with her kids.
基金supported by the National Natural Science Foundation of China (10972006, 11172004)National Basic Research Program of China (2010CB832701)
文摘In this paper, a new method of topological cleanup for quadrilateral mesh is presented. The method first selects a patch of mesh around an irregular node. It then seeks the best connection of the selected patch according to its irregular valence using a new topological operation： small polygon reconnection （SPR）. By replacing the original patch with an optimal one that has less irregular valence, mesh quality can be improved. Three applications based on the proposed approach are enumerated： （1） improving the quality of a quadrilateral mesh, （2） converting a triangular mesh to a quadrilateral one, and （3） adapting a triangle generator to a quadrilateral one. The presented method is highly effective in all three applications.
基金the National Key Laboratory in University of Science and Technology Beijing of China （KFI3-02） and the Natural Science Foundation of Hebei province （E2013209339）.
文摘La2O3 is a combustion improver suitable for burning pulverized coal in blast furnace. La2O3 forms the active species La3＋（CO-）3 that weakens the bridge adhesion of carbon structural units and alters the lattice structures, thus reducing the activation energy of the pulverized coal and accelerating the burning process. Research shows that La2O3 can form the active species La3＋（CO-）3, which weakens the bridge adhesion of carbon structural units and alters the lattice structures of the fixed carbon, hence decreasing the activation energy of the pulverized coal and accelerating the burning process.
文摘For the college students, the instructors are the guides and helpers of the healthy growth of them, who play an important role in their establishment of a correct outlook on life, and values, and the cultivation of the good moral qualities. At present, in the team of the college counselors, there exist the problems that the responsibilities are fuzzy, and their own qualities need to be improved, and the construction of the occupation is slow, and so on, which require that we should recognize the positioning of the counselors＇ occupational role, and focus on the enhancement of the abilities of the counselors. Therefore, this paper puts forward the path to improve the abilities of the role of the counselors, in order to speed up the construction of the professionalism and specialization of the team of the college counselors, making them more capable of supporting the growth of the physical and mental health of the college students.
文摘BVRI CCD photometry of the poorly studied open cluster NGC 6724 has been carried out down to a limiting magnitude of V-20 mag. The stars of the cluster have been observed using the Newtonian focus （f/4.84） of the 74-inch telescope at Kottamia Astronomical Observatory in Egypt. Also, the 2MASS - JHK system is used to confirm the results we obtained. The main photometric parameters have been estimated for the present object; the diameter is found to be 6 arcmin, the distance is 15304-60pc from the Sun and the age is 900＋50Myr. The optical reddening E（B - V） = 0.65 mag, while the infrared reddening is E（J - H） = 0.20 mag. The slope of the mass function distribution and the relaxation time estimations indicate that cluster NGC 6724 is dynamically relaxed.
基金The Center for Risk-Based Community Resilience Planning is a NIST-funded Center of Excellencethe Center is funded through a cooper-ative agreement between the U.S.National Institute of Standards and Technology and Colorado State University(NIST Financial Assistance Award Numbers:70NANB15H044 and 70NANB20H008).
文摘Tornadoes can destroy or severely damage physical infrastructure including buildings in a community.This can result in direct losses but also indirect losses such as the closure of key social institutions reverberating further through the community(e.g.,schools).Despite significant losses in past events,building codes and standards have not previously included tornado hazards because of the relatively low probability of a direct strike.The recent release of the ASCE 7-22 standard considers tornadoes for Risk Category 3 and 4 buildings,i.e.ranging from schools to critical facilities.This study proposes a series of design combinations of a reinforced masonry school building with different performance targets intended to enable schools to reopen sooner.Tornado fragilities were developed for a school building having improved designs using tornado loads determined based on the new tornado chapter in ASCE 7-22,and then integrated into a community level model with school attendance zones to examine the effect.The ultimate goal in this study is to investigate the effect of improving school building designs would have on maintaining school continuity(and more rapid return)for school children.
基金funded by the National Natural Science Foundation of China (Grant Nos. 11173044(PI: Hou), 11073038 (PI: Chen), 10573022, 10973015 and 11061120454 (PI: Deng))the Key Project No.10833005 (PI: Hou)+2 种基金the Group Innovation Project No.11121062the US National Science Foundation grant AST 09-37523Chinese Academy of Sciences is acknowledged for providing initial support from grant number GJHZ 200812
文摘We describe the target selection algorithm for the low latitude disk por- tion of the LAMOST Pilot Survey, which aims to test systems in preparation for the LAMOST spectroscopic survey. We use the PPMXL astrometric catalog, which provides positions, proper motions, B/R/I magnitudes （mostly） from USNO-B and d/H/Ks from the Two Micron All Sky Survey （2MASS） as well. We chose eight plates along the Galactic plane, in the region 0° 〈 α° 〈 67° and 42° 〈 δ 〈 59°, which cover 22 known open clusters with a range of ages. Adjacent plates may have some small overlapping area. Each plate covers an area of 2.5° in radius, with its cen- tral star （for the Shack-Hartmann guider） brighter than 8th magnitude. For each plate, we create an input catalog in the magnitude range 11.3 〈 Imag 〈 16.3 and Bmag available from PPMXL. The stars are selected to satisfy the requirements of the fiber positioning system and have a uniform distribution in the I vs. B - I color-magnitude diagram. Our final input catalog consists of 12 000 objects on each of eight plates that are observable during the winter observing season from the Xinglong Station of the National Astronomical Observatory of China.
文摘IN the early mornings people can be found exercising all over Shuangyushu Park. Some practice qi gong; some walk their caged songbirds; others come to perfect their ballroom dancing skills. Of all of these early risers, the groups of elderly and middle-aged women dancing with fans and swords immediately catch the eye. The sword dancers display a beautiful combination of rigidity and flexibility. The fan dancers perform with
文摘In this paper, we construct two models for the searching task for a lost plane. Model 1 determines the searching area. We predict the trajectory of floats generated after the disintegration of the plane by using RBF neural network model, and then determine the searching area according to the trajectory. With the pass of time, the searching area will also be constantly moving along the trajectory. Model 2 develops a maritime search plan to achieve the purpose of completing the search in the shortest time. We optimize the searching time and transform the problem into the 0-1 knapsack problem. Solving this problem by improved genetic algorithm, we can get the shortest searching time and the best choice for the search power.
