遗传算法概述

遗传算法是一种全局优化的随机搜索算法。它是解决复杂优化问题的有力工具。在工程设计、演化硬件电路设计以及人工智能等方面应用前景广阔。系统地介绍了遗传算法的发展史、基本思想、特点、主要应用领域等相关方面。     

嵌入式实时系统开发的正确选择

设计工程师在定义和分析系统初始要求时必须认真考虑软硬件的协同关系.本文描述嵌入式系统和实时系统的关键特性,并探讨在选择或开发硬件和软件组件的基础上开发高效嵌入式系统的解决方案,同时详细说明嵌入式系统和实时系统开发所特有的关键工艺技术.     

复合药肥“克青封”的研究

青封灾是高寒山区水稻常见灾害。收获时稻株依然色泽青绿,不能正常成熟,不实粒率高,稻谷减产十分严重。“克青封”是我们１９９１及１９９２年在安徽省岳西县为御防青封灾研制成功的复合药肥,使用其最佳配方,效果显著,提前４～７天齐穗,提早７～１１天成熟,增产１５％以上。     

Reconsideration of Factors Involved in ELT/ELL

Asweallknow,thefactorssuchaslearners,teachersandsocialcontextsareverycrucialtoimprovethestudents'languageproficiency.Andthesefactorsneedtoberecon-sideredinthecourseofELTreform.I.LearnerFactorsInmyopinion,alanguagecanbelearnedratherthantaught.Ateachercanfeelsurethatheisteaching,butitisdifficultforhimtomakesurethatlearningdoestakeplace.ThatshowslearnersstandinasubjectivepositionintheprocessofEnlishteachingandlearning.Therefore,learnerfactorsshouldbetakenintofirstconsiderationinthere-form.1.T…     

Perspectives on Socialization Factors in University Students in the People's Republic of China and the United States

This paper focuses on the socialization factors of undergraduate students that lead to the readiness for education.Factors such as parental socialization,student background characteristics,pre college normative pressures and influences,and non college refernce groups will be helpful in relating to reality of undergraduate students.This information will help both faculty and administrators meet the needs of students by understanding the processes of development and change in their college years.     

图书情报事业战略目标的选择与定位

本文论述了可持续发展中图书情报事业战略地位和作用，及可持续发展总体目标制约下的图书情报事业战略目标；论述了国家可持续发展中图书情报事业战略目标选择与定位的基础，并在此基础上提出了国家可持续发展中图书情报事业战略目标选择和国家可持续发展中图书情报事业的定位：即信息资源定位、信息服务定位、信息技术定位和组织管理定位。文章还对图书情报事业定位发展的政策和法律保障进行了探讨。     

中小学信息化领导力实践的现实困境与路径选择

信息化领导力是教育信息化深入发展中的一个重大课题。通过对领导力及信息化领导力概念的解构,发现信息化领导力不仅仅是领导者(如校长)个人的能力特质或影响力,更需要关注的是整个领导集体的领导力与被领导者的反作用力之间的合力。在对校长信息化领导力实践的现实拷问下,转变领导观念、确立共同愿景、培育信息化领导团队、实行分工与协作是学校信息化领导力实践的现实路径选择。     

荒诞的世界,自由的选择--解读《第二十二条军规》中的存在主义思想

约瑟夫.海勒虽然不属于存在主义作家,但作为“黑色幽默”文学的代表作家,他深受存在主义思想的影响。本文试图通过分析小说的主题和人物的行为来解读约瑟夫.海勒的长篇小说《第二十二条军规》中的存在主义思想。     

海外留学高等教育专业选择问题研究

本研究用项目课题组在全国七个城市的抽样数据,对中国应届高中毕业生海外留学科技导向类与非科技导向类专业的选择问题进行了多元逻辑回归分析。研究发现,留学专业选择受到留学预期收益率等经济因素的显著影响。文章对上述研究结果给予了理论回应及政策建议。     

Bar velocities capable of optimising the muscle power in strength-power exercises

This study aimed at testing whether there are mean propulsive velocities (MPVs) capable of maximising the mean propulsive power (MPP) during the execution of bench press (BP), bench throw (BT), half squat (HS) and jump squat (JS). Additionally, we assessed the differences in MPP/MPV between ballistic and traditional exercises. Seventeen male rugby sevens players performed MPP tests in BP, BT, HS and JS and maximum isometric force (MIF) tests in HS and BP. The JS presented higher MPP (977.4 ± 156.2 W) than the HS (897.9 ± 157.7 W) (P < 0.05); the BP (743.4 ± 100.1 W) presented higher MPP than the BT (697.8 ± 70.4 W) (P < 0.05). Ballistic exercises presented higher optimum MPV (JS = 1.02 ± 0.07 m·s^?1; BT = 1.67 ± 0.15 m·s^?1) than traditional exercises (HS = 0.93 ± 0.08 m·s^?1; BP = 1.40 ± 0.13 m·s^?1) (P < 0.05). The optimum MPP in the JS, BT, HS and BP occurred at 28.2 ± 5.79, 23.3 ± 4.24, 32.4 ± 9.46 and 27.7 ± 5.33% of the MIF, respectively. The coefficient of variation (CV) of MPV at optimum MPP ranged from 7.4% to 9.7%, while the CV of %MIF ranged from 18.2% to 29.2%. The MPV is a more precise indicator of the optimum loads than the percentages of MIF due to its low inter-subject variability as expressed by CV. Therefore, MPV can be used to determine the optimum power load in the four investigated exercises.