基于GIS网络分析的龙岩城市公园可达性研究     

林斌  颜逸静  金博闻  潘辉 《黑龙江生态工程职业学院学报》2021,34(3):11-14,26

以ArcGIS10.5软件模拟步行、非机动车和机动车三种出行方式,结合城市人口分布数据,从公园个体和整体两个角度分析龙岩市主城区内7个城市公园可达性.结果表明:公园地理位置集中于中部,分布不均,城市路网不完善;机动车可达效果最佳,20min内可达面积比为56.62％,人口比为71.23％;整体上公园的可达面积、人口比较低,其中路网不完善是影响公园可达性的重要因素.基于此,提出均衡公园及入口数量、完善路网等优化意见,为提高城市公园服务公平性及优化城市公园空间格局提供参考.  相似文献   

How is “Knowledge” Constructed During Science Activities? Detaching Instructional Effects of “Playing” and “Telling” to Optimize Integration of Scientific Investigations     

Zhang  Lin  Van Reet  Jennifer 《Research in Science Education》2022,52(5):1435-1449

Research in Science Education - Despite recommendations from science educational standards which claim that science teaching should engage students in scientific investigations the same way...  相似文献   

“通专结合”下设计专业通识课教学改革研究——以“设计认知与思维导入”课程为例     

庞琳  田瑾 《教育教学论坛》2022,(2)

在"新学分"背景下对设计基础课重新定位,整合教学资源,优化课程设置,打造多专业"设计通识课程"。"设计认知与思维导入"课程针对设计类专业培养诉求,把握设计认知和思维规律的通识性,量身打造通识化的课程内容和个性化的专业接口,实现与后续课程的精准对接。在一门课程中达到"通识"与"专业"的结合。让学生初步了解创意设计的流程、方法,提升学生的创意素养,从而使学生打开思路、举一反三,培养学生的创意思维能力。  相似文献   

Changes in children’s anger,sadness, and persistence across blocked goals: Implications for self-regulation     

Lin Tan  Eunkyung Shin  Kenyon Page  Cynthia L. Smith 《Child development》2023,94(2):411-423

The current study took a person-centered approach to examine the heterogeneity of changes in children’s emotions and persistence during a goal-blocking task and examined how different profiles of emotions and persistence related to children’s self-regulation. Children’s anger, sadness, and persistence were rated in a goal-blocking task in toddlerhood (T1; N = 140, 72 boys, M_age = 2.67 years, 90.7% White) and preschool (T2). Children’s self-regulation, specifically sustained attention and engagement, was assessed at T1, T2, and early school-age (T3) from 2005 to 2012. Growth mixture modeling revealed two classes of children at T1 and three classes at T2 with different patterns of anger, sadness, and persistence. Children’s classification at T2, but not T1, significantly predicted their sustained attention and engagement both concurrently and longitudinally.  相似文献   

Instructional practices in secondary science: How teachers achieve local and standards-based success     

Beth A. Covitt  Elizabeth Xeng de los Santos  Qinyun Lin  Christie Morrison Thomas  Charles W. Anderson 《科学教学研究杂志》2024,61(1):170-202

This article reports on analyses of the instructional practices of six middle- and high-school science teachers in the United States who participated in a research-practice partnership that aims to support reform science education goals at scale. All six teachers were well qualified, experienced, and locally successful—respected by students, parents, colleagues, and administrators—but they differed in their success in supporting students' three-dimensional learning. Our goal is to understand how the teachers' instructional practices contributed to their similarities in achieving local success and to differences in enabling students' learning, and to consider the implications of these findings for research-practice partnerships. Data sources included classroom videos supplemented by interviews with teachers and focus students and examples of student work. We also compared students' learning gains by teacher using pre–post assessments that elicited three-dimensional performances. Analyses of classroom videos showed how all six teachers achieved local success—they led effectively managed classrooms, covered the curriculum by teaching almost all unit activities, and assessed students' work in fair and efficient ways. There were important differences, however, in how teachers engaged students in science practices. Teachers in classrooms where students achieved lower learning gains followed a pattern of practice we describe as activity-based teaching, in which students completed investigations and hands-on activities with few opportunities for sensemaking discussions or three-dimensional science performances. Teachers whose students achieved higher learning gains combined the social stability characteristic of local classroom success with more demanding instructional practices associated with scientific sensemaking and cognitive apprenticeship. We conclude with a discussion of implications for research-practice partnerships, highlighting how partnerships need to support all teachers in achieving both local and standards-based success.  相似文献   

国内图书馆内刊内报的现状调查分析——以2014中国图书馆阅读推广类十佳内刊内报为例     

林晓青 《新世纪图书馆》2014,(11):36-39

随着图书馆事业的蓬勃发展,我国各级各类图书馆自编自印的阅读推广类报刊已日益成为深入而广泛地开展全民阅读推广工作的重要载体。结合2014年十佳图书馆阅读推广类内刊内报开办的具体实践,论文对国内图书馆内刊内报的现状进行全面调查,探析其特点,剖析其成功经验及存在的问题,以期引起同行的关注,为探求适合我国图书馆内部期刊发展的新路提供一些借鉴。  相似文献   

园林解说系统的技术创新探讨     

王琳 《科技广场》2014,(7):186-190

革除空泛"说教",提升"说服"力度,成为我国当前和未来园林解说系统发展的必然选择。本文基于技术创新的时代背景以及园林解说系统的发展现状,以南昌天香园为案例实证分析园林解说系统的有效性,并在此基础上,构建园林解说系统的技术创新模式,提出园林解说系统的技术创新策略。  相似文献   

科学发展观引领独立学院学生党建工作再创新局面--沈阳航空航天大学北方科技学院学生党建工作探索与实践     

秦晔  矣宁  马宁 《科教文汇》2014,(10):177-178

近年来,随着学生党建工作对独立学院健康发展的作用日趋显著,独立学院也更加重视对学生党建工作的研究与探讨。本文以沈阳航空航天大学北方科技学院为例,探索在科学发展观理论的指导下,独立学院学生党建工作的新思路、新方法,并将学院践行理论的实际工作成果作呈报。  相似文献   

Stochastic error simulation method of fiber optic gyros based on performance indicators   总被引：1，自引：0，他引：1  

Pin Lv  Jizhou LaiJianye Liu  Guoqing Qin 《Journal of The Franklin Institute》2014

Gyro simulation is an important process of inertial navigation theory research, with the major difficulty being the stochastic error modeling. One commonly used stochastic model for a fiber optic gyro (FOG) is a Gaussian white (GW) noise plus a first order Markov process. The model parameters are usually obtained by using time series analysis methods or the Allan variance method through FOG static experiment. However, in a real life situation, a FOG may not be used. In this paper, a simulation method is proposed for estimating the stochastic errors of FOG. When using this method, the model parameters are set based on performance indicators, which are chosen as the angle random walk (ARW) and bias stability. During the research, the ARW and bias stability indicators of the GW noise and the first order Markov process are analyzed separately. Their analytical expressions are derived to reveal the relation between the model parameters and performance indicators. In order to verify the theory, a large number of simulations were carried out. The results show that the statistical performance indicators of the simulated signals are consistent with the theory. Furthermore, a simulation of a VG951 FOG is designed in this research. The Allan variance curve of the simulated signal is in agreement with the real one.  相似文献   

Multi-objective output feedback control for autonomous spacecraft rendezvous     

Lin Zhao  Yingmin Jia 《Journal of The Franklin Institute》2014

In this paper, the problem of robust output feedback control for a class of spacecraft rendezvous systems is investigated, which contains parameter uncertainty, external disturbance, poles assignment, _H∞-norm$H_{\infty }\mathrm{-}\mathrm{norm}$, variance and input constraints. The aim of this problem is to design a dynamic output feedback controller such that the closed-loop poles are placed within a specified disc, the _H∞$H_{\infty }$ norm of the transfer function from disturbance to output is ensured to be less than a prespecified disturbance attenuation level, the steady-state variance for each state of spacecraft rendezvous system is guaranteed to be less than the prespecified individual upper bound, and the actual control input is confined into a certain range simultaneously. Based on the Lyapunov theory, the existence conditions of such controller are derived in terms of linear matrix inequalities (LMIs). An illustrative example is given to demonstrate the effectiveness of the proposed control design method.  相似文献