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Differential Gene Expression Between Cross-Fertilized and Self-Fertilized Kernels During the Early Stages of Seed Development in Wheat 被引量:2
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作者 MENGFan-rong NIZhong-fu WULi-min WANGZhang-kui XIEXiao-dong SUNQi-xin 《Agricultural Sciences in China》 CAS CSCD 2004年第12期881-887,共7页
In order to understand molecular basis of cross-fertilized kernel advantage and heterosis, improved differential display of mRNA was used in this study to analyze alterations in gene expression between cross-fertili... In order to understand molecular basis of cross-fertilized kernel advantage and heterosis, improved differential display of mRNA was used in this study to analyze alterations in gene expression between cross-fertilized and self-fertilized kernels at 2, 4, 6, 8, 10 and 12 days after pollination (DAP) by using 3 wheat hybrids with different level of heterosis. Four patterns of differential expression were observed: (i) bands observed in cross-fertilized kernels but not in self-fertilized kernels (BCnS); (ii) bands occurring in only self-fertilized kernels but not in cross-fertilized kernels (BSnC); (iii) cDNA over-expressed in cross-fertilized kernels compared to self-fertilized kernels (OEC); (iv) cDNA under-expressed in cross-fertilized kernels compared to self-fertilized kernels (UEC). Further analysis showed that BCnS is positively correlated with heterosis, but BSnC is negatively correlated with heterosis. Four differentially expressed cDNA fragments were verified by reverse-northern blot and sequence homology search in GenBank showed that one of them was new sequences; the other exhibited higher similarity to NBS-LRR type resistance protein, 1,6-bisphosphatase and photosystem Ⅱ chlorophyll a-binding protein psbB, respectively, which indicated diverse pathways may be involved in heterosis formation. 展开更多
关键词 WHEAT CROSS-FERTILIZATION self-FERTILIZATION Seed development Gene expression HETEROSIS
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On the Self Management in MET Development
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作者 Wang Ji-chang 《Journal of Shipping and Ocean Engineering》 2016年第5期291-301,共11页
Maritime English teaching has placed higher requirements on the part of the teachers. In combination with the requirements and the characteristics of maritime English teaching, this article puts forth new viewpoints f... Maritime English teaching has placed higher requirements on the part of the teachers. In combination with the requirements and the characteristics of maritime English teaching, this article puts forth new viewpoints for the self management of maritime English teachers and provides evidence in the aspects of theory and practice. 展开更多
关键词 Maritime English teaching self management teaching effects teacher development.
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Countermeasures on Elevating Self-development Ability of Western Rural Areas on the Basis of Visual Threshold of Human Capital
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作者 LAN Hong-xing College of Politics and Law,Sichuan Agricultural University,Ya’an 625014,China 《Asian Agricultural Research》 2011年第2期123-125,137,共4页
The thesis underscores the significant role of human capital in elevating rural self-development ability.The investment of human capital is making great contribution to western rural economic growth,and it plays an ir... The thesis underscores the significant role of human capital in elevating rural self-development ability.The investment of human capital is making great contribution to western rural economic growth,and it plays an irreplaceable role in promoting the socio-economic development prominently.The characteristics of human resources development in western rural areas for the moment are analyzed as follows:the employment structure is simple;the structure of human resources is irrational;the shortage of human resources aggregate is accompanied by the critical phenomenon of idling;the human resources drain badly;there is low input and low output of talents.The thesis also propounds the fundamental approaches in order to elevating self-development ability of western rural areas:we should practise and implement National Medium and Long-term Planning of Talents Development and lay down as soon as possible the detailed matching policies and measures based on the reality of western rural areas;we should develop the education in western rural areas vigorously,and formulate the developmental strategies of bridging "knowledge gap";we should establish sound rural human resources development system,and reinforce the degree of training returning-home migrant workers;we should adjust the structure of human investment timely as needed,and strengthen the degree of human capital investment conspicuously. 展开更多
关键词 WESTERN RURAL Areas BIG development of human resou
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Analysis on Factors Influencing Sustainable Development of Self-study Examination of Agricultural Science Disciplines
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作者 ZHAO Yan-bing College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China 《Asian Agricultural Research》 2012年第1期74-77,共4页
Based on existing problems in the course of development of self-study examination of agricultural science disciplines, this paper analyzes logical conditions for its sustainable development. Major logical conditions i... Based on existing problems in the course of development of self-study examination of agricultural science disciplines, this paper analyzes logical conditions for its sustainable development. Major logical conditions include requirement for free and comprehensive development of individuals; requirement for social institutional evolution and change; requirement for fairness and justice of education and development; as well as requirement for better-established organization system and higher social reputation. Finally, it presents basic measures for sustainable development of self-study examination of agricultural science disciplines, including carrying on reasonable core elements of self-study examination system, adjusting structure of discipline, improving social assistance system, and expanding service space. 展开更多
关键词 self-STUDY EXAMINATION AGRICULTURAL science discip
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Development of a Dietary Habit Self-Management Skills Scale for Post-Gastrectomy Cancer Patients in Japan
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作者 Miharu Ogasa 《Health》 2017年第13期1750-1775,共26页
Purpose: The purpose of the present study was to develop a Dietary Habit Self-Management Skill (DHSMS) scale, and to test the reliability and validity of this scale. Methods: A questionnaire survey was then conducted ... Purpose: The purpose of the present study was to develop a Dietary Habit Self-Management Skill (DHSMS) scale, and to test the reliability and validity of this scale. Methods: A questionnaire survey was then conducted using a 69-item DHSMS scale (second draft) for which content validity had been confirmed. The participants were post-gastrectomy cancer patients aged from 40 to under 80 years who had undergone initial gastrectomy with an interval of from 1 month since discharge to <3 years post-operative. Results: The scale is a second-order factor model with “Dietary habit self-management skills” as a higher-order factor, four factors—”Skill to form partnerships with other important people”, “Skill to prevent or cope with post-gastrectomy disorder”, “Skill to grasp issues accompanying post-gastrectomy disorder”, and “Self-efficacy”—and 27 items. The construct validity of the scale was confirmed. Cronbach’s alpha coefficient of the DHSMS scale was 0.915. The criterion- related validity of the DHSMS scale was confirmed based on the correlations between overall DHSMS scale scores and “Number of post-gastrectomy disorder symptoms experienced”, the score for the subscale “Skill to grasp issues accompanying post-gastrectomy disorder” and “Number of post-gastrectomy disorder symptoms experienced”, and the subscale “Self-efficacy” and the SF-8. Discussion: By using patients’ self-administered DHSMS scale scores, medical professionals are able to assess the level of a patient’s self-management skills and the status of their dietary habits as a result of post-gastrectomy disorder. 展开更多
关键词 self-MANAGEMENT SKILL Gastric Cancer DIETARY HABIT SCALE development
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Survey and Inquiry for English Teachers' Self-development in Freshly Certificated Universities in Guangxi
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作者 FAN Xin-heng 《海外英语》 2014年第2X期13-14,共2页
With great a quantity of upgraded colleges accounted in Guangxi Zhuang Automous Region,self-development of college English teachers directly appeals to the quality of teaching,English curriculum program and academic d... With great a quantity of upgraded colleges accounted in Guangxi Zhuang Automous Region,self-development of college English teachers directly appeals to the quality of teaching,English curriculum program and academic development competence.The paper preliminarily stepped in the internal and external elements on the them to carry on inquiry to the findings that these teachers are in good consciousness of language skills,specialized knowledge and personal communication,common improvement conformed with the achievements abroad.And by interviewing the convenient sampling the inquiryshows that they have the consciousness of changing with times.The hardest challenging is deficiency of quality education channels to promote their teaching competence and academic ability.The paper is advisory for playing vital role in their self-development inquiry in a whole perspective. 展开更多
关键词 self-development BELIEFS group communication refle
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Inquiry Summary for Universities English Teachers' Self-development
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作者 FAN Xin-heng 《海外英语》 2014年第4X期69-70,共2页
College English teachers' Self development apparently affects teaching quality, major curriculum development and inquiry development. The scope of inquiry summary indicates the intrinsic factors as awareness of pr... College English teachers' Self development apparently affects teaching quality, major curriculum development and inquiry development. The scope of inquiry summary indicates the intrinsic factors as awareness of professional competence, professional-knowledge learning awareness, awareness of teaching means, development awareness and the notions alike. And the summary comes to the findings that foreign ones ignore the effect of the external factors, the domestic just focus on the teaching pattern of team, yet ignore the scientific and inquiry group construction. 展开更多
关键词 university ENGLISH TEACHERS self-development belie
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The Role of Reflection in Development Of Chinese Teachers of English
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作者 金力 《内蒙古师范大学学报(教育科学版)》 2000年第4期179-182,共4页
Reflection is an important way of teachers’ self development. Teachers of English may improve their classroom practice by reflecting. There’re a number of ways of reflecting for teachers to choose from. Reflection, ... Reflection is an important way of teachers’ self development. Teachers of English may improve their classroom practice by reflecting. There’re a number of ways of reflecting for teachers to choose from. Reflection, to a large extent, can help and push the teacher forward in their professional development. 展开更多
关键词 REFLECTION TEACHING self development
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Incorporating the Reflective Approach into Teacher Professional Development 被引量:2
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作者 吴晓春 《内蒙古师范大学学报(哲学社会科学版)》 1999年第S3期153-158,共6页
There exists an increasing tendency in the ELT field that the teaching is referred as a profession. In our context, being professional means being the effective teacher, which is required to develop continuously throu... There exists an increasing tendency in the ELT field that the teaching is referred as a profession. In our context, being professional means being the effective teacher, which is required to develop continuously throughout the whole career. Teacher professional development, in this article, mainly the issue of teacher professional self-development is discussed. In order for that to be realized, the reflective approach is bring introduced. Here, the reflective approach is primarily based on doing Action Research that includes Rettospective technique, Observation technique, Questionnaires and Interviews and Case Study. 展开更多
关键词 TEACHER PROFESSIONAL self-development REFLECTIVE APPROACH Action RESEARCH
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Study on Village Renovation Planning and Design Oriented by "Endogenous Development"——A Case Study of Zengjia Village,Guangchang County,Fuzhou City
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作者 Shizhu LU Zhian LU 《Asian Agricultural Research》 2019年第2期13-18,共6页
Through the discussion of the current new rural construction issues,this paper points out a new development idea for the traditional rural construction. We should tap the local resources,stimulate the internal motivat... Through the discussion of the current new rural construction issues,this paper points out a new development idea for the traditional rural construction. We should tap the local resources,stimulate the internal motivation of the village,emphasize the villagers as the main body,leading the village development-oriented renovation planning and design. With regard to the construction of " endogenous development" system,this paper discusses it from five perspectives: ecology,economy,culture,space and society. And combined with the planning and design practice of Zengjia Village,Guangchang County,Fuzhou City,we carry out renovation planning and design of the village from six aspects( " personal in-home interview" for current situation investigation; village spatial control and development planning; guidance for the dominant and diversified development of industry; the actual space environment renovation suitable for the village; continuation of the traditional culture to enhance the village look; enhancement of the participation of villagers in the whole process). It is pointed out that village renovation should not only stay in the improvement of the material environment,but also place greater emphasis on guiding the subjective initiative of the villagers,stimulate the endogenous power of the village,strengthen and guide the villagers' self-governance,and promote the sustainable development of village construction. 展开更多
关键词 ENDOGENOUS development VILLAGE RENOVATION Villager self-governance Sustainable development
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The Process by Which Girls Who Develop Type 1 Diabetes before School Age Acquire Self-Management Skills during Puberty and Adolescence
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作者 Ayumi Yamasaki Yuko Tomari +1 位作者 Ryuzo Takaya Manabu Ishiro 《Health》 CAS 2016年第15期1788-1806,共20页
Our aim was to clarify the process by which girls who develop type 1 diabetes before school age acquire self-management skills during puberty and adolescence. We conducted semi-structured interviews with such women wh... Our aim was to clarify the process by which girls who develop type 1 diabetes before school age acquire self-management skills during puberty and adolescence. We conducted semi-structured interviews with such women who had reached adolescence, and analyzed the results using the modified grounded theory approach (M-GTA). We found the process to be composed of eight categories: Girls begin to feel they understand their own bodies;Girls give precedence to fun, and forget about their disease;Girls build a foundation for taking control of their physical health;Girls feel “out of sync” with their physical sensations;Girls gain new awareness of their disease due to discrimination and comparing themselves to others;Girls revisit their lifestyle and diabetes care practices, with an eye to their future;Girls employ the wisdom and knowledge they have gained from experience;Girls are frustrated at diabetes’ relent-less presence in their lives. The learning process could be roughly divided into two periods: a period dominated by annoyance, where girls prioritize fun activities and try to forget about their disease, and a period where they leverage their wisdom to revisit their care behaviors and change their lifestyle. 展开更多
关键词 Type 1 Diabetes GIRLS Childhood development self-MANAGEMENT Puberty and Adolescence
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城市住宅更新路径探索:低层住宅自主更新试点的可行性与推广策略
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作者 赵庆远 赵立冲 王艺燃 《价值工程》 2025年第1期165-168,共4页
本文通过梳理城市住宅更新的背景与现状,分析了房屋日趋老旧的自然规律与居民不断提升的居住需求之间的天然矛盾。在当前城镇化率逐渐接近理论峰值、人口总量趋于下降以及房地产市场转型等宏观背景下,指出业主主导的自主更新是解决这一... 本文通过梳理城市住宅更新的背景与现状,分析了房屋日趋老旧的自然规律与居民不断提升的居住需求之间的天然矛盾。在当前城镇化率逐渐接近理论峰值、人口总量趋于下降以及房地产市场转型等宏观背景下,指出业主主导的自主更新是解决这一矛盾的必然选择。文章进一步指出,低层住宅小区在自主更新中的意见统一、规划设计灵活性、资金平衡以及组织实施等方面具有相对优势,是自主更新试点的优先选项。基于此,本文提出了政策支持、法律规制、社区组织强化和多元化资金筹集等推广策略,为实现城市住宅的可持续更新和品质化发展提供了可行的探索路径和思路。 展开更多
关键词 低层住宅 自主更新 住宅升级 可持续发展
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高水平科技自立自强的内涵特征、评价指标与实现路径 被引量:9
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作者 盛朝迅 《改革》 CSSCI 北大核心 2024年第1期40-50,共11页
高水平科技自立自强是高水平科技自立和高水平科技自强的有机统一,具有自主性、引领性、开放性、体系性、可持续性等重要特征。实现高水平科技自立自强的主要标志是关键核心技术自主可控、重要创新成果全球领先、国际科技合作紧密高效... 高水平科技自立自强是高水平科技自立和高水平科技自强的有机统一,具有自主性、引领性、开放性、体系性、可持续性等重要特征。实现高水平科技自立自强的主要标志是关键核心技术自主可控、重要创新成果全球领先、国际科技合作紧密高效、体系化创新支撑能力强、科技创新体制机制完善,可以用关键核心技术自给率、高被引论文占全球比重、三方专利拥有量占全球比重、全社会研发投入与国内生产总值比值、知识产权出口额占全球比重、全球创新指数排名等18个指标进行衡量。经过多年的发展,我国科技自立自强取得明显成效,但也存在原始创新能力还不强、科技生态需要进一步优化等问题,亟须抓住破除体制机制障碍这个关键,深化科技体制改革,加快构筑完善的新型举国体制、原创技术激发机制、开放合作机制、创新生态育成机制和持续投入机制,形成符合科研规律,有效满足国家发展和市场需求,鼓励创新、开放包容、充满活力、系统有效的科技创新体制机制。 展开更多
关键词 科技自立自强 科技创新 创新驱动发展战略
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THE SELF-GRINDING MECHANISM AND AFFECTING FACTORS OF BULK MATERIAL IN FLUID MOTION
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作者 俞良中 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1997年第Z1期146-151,共6页
The fluidity and classification of bulk material (loose body) were introduced, the self-grinding mechanism and the affecting factors of bulk materials in various forms of phase, state and motion were investigated. A r... The fluidity and classification of bulk material (loose body) were introduced, the self-grinding mechanism and the affecting factors of bulk materials in various forms of phase, state and motion were investigated. A rotational-flow-state centrifugal autogenous grinder was developed on the basis of applying self-grinding mechanism of bulk material,the result tested by the autogenous grinder was compared with that tested by 4R Raymond mills, and fine particles with extremely high specific area were obtained. The feasibility of the developed new-type autogenous grinder in the view of fluid motion of bulk material was proved. 展开更多
关键词 motion of bulk material self-grinding mechanism new developed mill
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“综合刊”的独特性质及其高质量发展的目标与关键 被引量:2
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作者 姜佑福 《河北学刊》 CSSCI 北大核心 2024年第2期14-22,共9页
综合性中文社科学术期刊,是一种具有鲜明中国特色的期刊类型,不仅在历史上渊源有自,而且在以中国式现代化全面推进强国建设、民族复兴伟业,甚至在影响人类社会未来前进方向上具有举足轻重的地位。从精神气质上说,综合性中文社科学术期... 综合性中文社科学术期刊,是一种具有鲜明中国特色的期刊类型,不仅在历史上渊源有自,而且在以中国式现代化全面推进强国建设、民族复兴伟业,甚至在影响人类社会未来前进方向上具有举足轻重的地位。从精神气质上说,综合性中文社科学术期刊具有紧跟时代步伐,贯通人文和社科领域,整体性地研究经济社会发展和国家现代化建设进程的学术抱负。“综合刊”之为“综合刊”的“综合性”,不仅与马克思主义理论和中华传统文化重视整体性、系统性的思维特质相契合,而且与中华民族伟大复兴和社会主义现代化国家建设当前阶段特别重视全局性、战略性问题的内在要求相适应,这些基本性质决定了综合性中文社科学术期刊在中国特色哲学社会科学构建和当代中国学术评价体系重塑过程中具有无可替代的独特作用。综合性中文社科学术期刊应当立足于自身独特定位倡导一种思想性、学术性、时代性和典范性并重的“综合刊”文体,并以此为枢纽推动中国特色哲学社会科学的整体性创新、培养和扶持与综合刊历史地位相匹配的核心作者群,以及通过集中呈现当代中国学术“拎得起来”和“看得见”的标志性成果来推动中外学术交流。综合性中文社科学术期刊高质量发展基本目标的实现,关键在于能否立足于自身独特定位自觉参与当代中国学术评价体系的革命性重塑,建立“综合刊”之间更自觉的联盟与协作,在期刊之间和编者作者之间建立“亲清”刊刊和刊学关系,在恰当认识与正确把握期刊发展数字化及国际化趋势的基础上坚守“内容为王”和“中文为本”。 展开更多
关键词 综合性中文社科学术期刊 高质量发展 高品质期刊 自我觉醒 自我革命
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经济安全治理体系的生成逻辑和实现路径 被引量:1
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作者 郭冠清 《新疆师范大学学报(哲学社会科学版)》 CSSCI 北大核心 2024年第5期77-90,F0002,共15页
经济安全是国家安全的基础,是经济发展的前提。首先,文本从人民至上的价值观、唯物史观、科学思想方法三个层面,探索了经济安全治理体系演变的方法论基础;其次,以开放条件下社会再生产理论为依托,对经济安全治理体系生成的理论逻辑进行... 经济安全是国家安全的基础,是经济发展的前提。首先,文本从人民至上的价值观、唯物史观、科学思想方法三个层面,探索了经济安全治理体系演变的方法论基础;其次,以开放条件下社会再生产理论为依托,对经济安全治理体系生成的理论逻辑进行研究,对为什么要更好地发挥政府的作用、为什么要提高自主生产能力、为什么要提高经济增长的内生动力进行分析;再次,以经济思想史为视角,对经济安全治理理念标识性概念从统筹革命与建设的关系到统筹经济建设和国防建设的关系,再到正确处理改革发展稳定关系,最后到统筹发展和安全演化进行梳理;最后,从全面深入贯彻新发展理念和总体国家安全观、健全宏观经济治理体系、加快科技自立自强步伐、提高国内外双循环的动力和活力等方面,对如何增强经济安全性的主动权,推动经济安全治理体系和能力现代化进行分析。 展开更多
关键词 唯物史观 科学思想方法 统筹发展和安全关系 科技自立自强 增强发展安全性的主动权
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基于自主学习能力培养的高职学生学习评价体系探究 被引量:2
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作者 薛欣欣 苏新留 《中国人民大学教育学刊》 CSSCI 2024年第2期100-112,共13页
自主学习是个体终身学习、适应社会的基础,高等职业教育作为教育的重要组成部分,肩负着培养学生自主学习能力的重要使命。学习评价作为高职院校开展教育教学活动的“指挥棒”,是培养高职学生自主学习能力、提升高职院校人才培养质量的... 自主学习是个体终身学习、适应社会的基础,高等职业教育作为教育的重要组成部分,肩负着培养学生自主学习能力的重要使命。学习评价作为高职院校开展教育教学活动的“指挥棒”,是培养高职学生自主学习能力、提升高职院校人才培养质量的重要切入点。在对培养高职学生自主学习能力的必要性、高职学生学习评价存在的问题进行剖析的基础上,本研究立足学生自主学习能力培养,从“评什么-谁来评-如何评-怎么用”四个方面构建多维度多元化全过程重反馈的高职学生学习评价体系,以期助力培养德才兼备的高素质技术技能人才,主要包括:拓展评价内容,培养学生高阶思维;增加评价主体,鼓励学生自我评价;创新评价方式,关注学生学习过程;强化结果反馈,提高学生学习效果。 展开更多
关键词 高职院校 自主学习能力培养 学习评价体系
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工作繁荣在教练型领导与护士职业成长间的中介效应
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作者 杨帆 魏万宏 +2 位作者 张金燕 程良莹 张栌文 《护理学杂志》 CSCD 北大核心 2024年第4期60-63,共4页
目的探讨护士工作繁荣对教练型领导与职业成长关系的中介效应。方法采用多阶段分层抽样法,选择河南省7所三级甲等医院的447名护士为研究对象,使用护士职业成长量表、教练型领导感知评价量表(护士他评版)和工作繁荣量表进行调查。结果护... 目的探讨护士工作繁荣对教练型领导与职业成长关系的中介效应。方法采用多阶段分层抽样法,选择河南省7所三级甲等医院的447名护士为研究对象,使用护士职业成长量表、教练型领导感知评价量表(护士他评版)和工作繁荣量表进行调查。结果护士评估的教练型领导评分为69.61±19.17,工作繁荣评分为49.93±10.12,职业成长评分为49.00±10.07,三者之间互为正相关(均P<0.05)。分层回归分析结果显示,在控制一般资料变量后,教练型领导及工作繁荣能解释职业成长总变异的38.2%。工作繁荣在教练型领导与职业成长之间起中介作用,中介效应占总效应的52.560%。结论教练型领导有助于提升临床护士工作繁荣水平,进而促进其职业成长,提示护理管理者施展教练型领导以挖掘护士职业发展潜力。 展开更多
关键词 护士 教练型领导 工作繁荣 职业成长 自身潜能 自我超越 中介效应 职业发展
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促进中国式现代化的发展法学理论创新 被引量:3
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作者 张东 《华东师范大学学报(哲学社会科学版)》 CSSCI 北大核心 2024年第1期113-128,178,179,共18页
旨在解决发展问题、促进全面发展的发展法学学科,与中国式现代化发展战略存在高度耦合,提供了研究中国式现代化的新视角。中国式现代化的新发展战略与发展法学的理论创新存在双向互动关系:一方面,中国式现代化的新发展战略,构造了发展... 旨在解决发展问题、促进全面发展的发展法学学科,与中国式现代化发展战略存在高度耦合,提供了研究中国式现代化的新视角。中国式现代化的新发展战略与发展法学的理论创新存在双向互动关系:一方面,中国式现代化的新发展战略,构造了发展法学的新背景,要求从系统主义维度进一步创新发展法学理论;另一方面,系统主义发展法学理论在方法论、制度体系、理论体系三个维度的递进式创新,有助于促进与保障中国式现代化的实现。具体而言,在方法论创新方面,发展法学作为一门系统科学,应融入系统论方法以及结构—功能分析方法,进行以中国发展问题为中心的新综合研究,指导制度体系和理论体系的创新;在制度体系创新方面,系统发展法学理论应从促进全面发展出发,通过合理配置发展权利、义务与责任,创新促进中国式现代化的包容型制度体系;在理论体系创新方面,系统发展法学理论应从发生论、本体论、价值论、规范论、运行论、范畴论方面进一步创新,在发展研究领域建构中国自主的法学知识体系,为世界法学理论之进步与世界共同发展之实践,贡献中国方案。 展开更多
关键词 中国式现代化 发展法学学科 系统主义发展法学理论 自主法学知识体系
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Software Reusability Classification and Predication Using Self-Organizing Map (SOM)
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作者 Amjad Hudaib Ammar Huneiti Islam Othman 《Communications and Network》 2016年第3期179-192,共14页
Due to rapid development in software industry, it was necessary to reduce time and efforts in the software development process. Software Reusability is an important measure that can be applied to improve software deve... Due to rapid development in software industry, it was necessary to reduce time and efforts in the software development process. Software Reusability is an important measure that can be applied to improve software development and software quality. Reusability reduces time, effort, errors, and hence the overall cost of the development process. Reusability prediction models are established in the early stage of the system development cycle to support an early reusability assessment. In Object-Oriented systems, Reusability of software components (classes) can be obtained by investigating its metrics values. Analyzing software metric values can help to avoid developing components from scratch. In this paper, we use Chidamber and Kemerer (CK) metrics suite in order to identify the reuse level of object-oriented classes. Self-Organizing Map (SOM) was used to cluster datasets of CK metrics values that were extracted from three different java-based systems. The goal was to find the relationship between CK metrics values and the reusability level of the class. The reusability level of the class was classified into three main categorizes (High Reusable, Medium Reusable and Low Reusable). The clustering was based on metrics threshold values that were used to achieve the experiments. The proposed methodology succeeds in classifying classes to their reusability level (High Reusable, Medium Reusable and Low Reusable). The experiments show how SOM can be applied on software CK metrics with different sizes of SOM grids to provide different levels of metrics details. The results show that Depth of Inheritance Tree (DIT) and Number of Children (NOC) metrics dominated the clustering process, so these two metrics were discarded from the experiments to achieve a successful clustering. The most efficient SOM topology [2 × 2] grid size is used to predict the reusability of classes. 展开更多
关键词 Component Based System development (CBSD) Software Reusability Software Metrics CLASSIFICATION self-Organizing Map (SOM)
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