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如何培养学生在物理方面的创新精神和实践能力
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作者 刘小严 《高考》 2020年第2期103-103,共1页
为促进学生在物理方面的创新精神和实践能力培养,笔者以《如何培养学生在物理方面的创新精神和实践能力》为课题,从培养高中生在物理方面的创新精神和实践能力的意义和必要性入手,对其进行了全面而深入地分析,并在此基础上探究了培养高... 为促进学生在物理方面的创新精神和实践能力培养,笔者以《如何培养学生在物理方面的创新精神和实践能力》为课题,从培养高中生在物理方面的创新精神和实践能力的意义和必要性入手,对其进行了全面而深入地分析,并在此基础上探究了培养高中生在物理方面创新精神和实践能力的策略,给出了笔者具有代表性的个人建议。 展开更多
关键词 物理方面 创新精神 实践能力 意义和必要性 策略
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一本人文的而非技术性的物理教材——评介A.Hobson著《物理学:基本概念及其与方方面面的联系》 被引量:5
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作者 赵凯华 秦克诚 《大学物理》 北大核心 2002年第8期44-46,共3页
英国学者C.P.斯诺一次写道:"人文学者嘲笑那些从来没有读过一本重要的英国文学作品的科学家太可怜.我曾多次出席一些被认为受过良好教育的人的集会,这些人一直夸夸其谈地表示,他们难以置信科学家如此缺乏文化素养.有一两次我被惹火... 英国学者C.P.斯诺一次写道:"人文学者嘲笑那些从来没有读过一本重要的英国文学作品的科学家太可怜.我曾多次出席一些被认为受过良好教育的人的集会,这些人一直夸夸其谈地表示,他们难以置信科学家如此缺乏文化素养.有一两次我被惹火了,就问他们当中有多少人能够叙述热力学第二定律.回答是一片冷寂:也是否定的.但我问的问题,只不过相当于问一个科学家‘你读过莎士比亚吗?'而已." 展开更多
关键词 技术性 物理教材 A.Hobson 人文性 书评 物理学:基本概念及其与方方面面的联系》
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高中物理常见电学问题的几点探究
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作者 王献 《电脑乐园》 2019年第12期201-201,共1页
高中阶段的学习在学生的学习生涯中所占的比重是比较大的,这一阶段是学生升入大学的必经阶段。高中阶段的各个学科的学习, 对于学生来讲都是有不同意义的,高中物理这门学科学习主要是针对于分科之后的理科学生所学,它讲求培养学生的理... 高中阶段的学习在学生的学习生涯中所占的比重是比较大的,这一阶段是学生升入大学的必经阶段。高中阶段的各个学科的学习, 对于学生来讲都是有不同意义的,高中物理这门学科学习主要是针对于分科之后的理科学生所学,它讲求培养学生的理性思考问题的能力, 而在高中阶段物理的学习过程中,最常见的就是电学方面的问题,电学学习与我们日常生活中的用电也是存在着一定的联系,因为电学方 面的知识都是比较难以理解的,所以也导致学生在物理方面电学的学习过程中产生很多的疑难,阻碍了自身学习的积极性。 展开更多
关键词 高中阶段 物理方面 常见电学问题 探究
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中国北方滨海湿地退化研究综述 被引量:19
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作者 张绪良 徐宗军 +2 位作者 张朝晖 谷东起 叶思源 《地质论评》 CAS CSCD 北大核心 2010年第4期561-567,共7页
中国北方沿海有入海河口湿地、三角洲湿地、粉砂淤泥质海岸湿地、海湾湿地、砂质海岸湿地、沉积岛屿滩涂湿地和滨海泻湖湿地等类型的滨海湿地约182.33×104hm2。由于受到海岸侵蚀、海面上升、风暴潮、入海河流断流和输沙量减少、气... 中国北方沿海有入海河口湿地、三角洲湿地、粉砂淤泥质海岸湿地、海湾湿地、砂质海岸湿地、沉积岛屿滩涂湿地和滨海泻湖湿地等类型的滨海湿地约182.33×104hm2。由于受到海岸侵蚀、海面上升、风暴潮、入海河流断流和输沙量减少、气候变化等自然因素和围垦、城市和港口建设、污染、海岸带油气资源开发、在入海河流上中游建设水库拦蓄径流和泥沙等人为因素的影响,中国北方的滨海湿地发生了严重的退化。中国北方滨海湿地的退化表现在物理、化学和生物3个方面。其中物理方面表现为自然湿地面积减小、人工湿地面积增大、湿地景观格局破碎化等,化学方面表现为湿地温室气体排放增加、水体富营养化、潮下带近海湿地赤潮灾害增强、湿地底质和渔获物污染、湿地土壤含盐量变化等,生物方面表现为湿地生物多样性水平下降、自然湿地净初级生产力降低、潮间带滩涂湿地和潮下带近海湿地渔获量减小、自然湿地植被退化演替等。 展开更多
关键词 滨海湿地 中国北方沿海 退化 物理方面 化学方面 生物方面
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Physical design method of MPSoC
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作者 LIU Peng XIA Bing-jie TENG Zhao-wei 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2007年第4期631-637,共7页
Floorplan, clock network and power plan are crucial steps in deep sub-micron system-on-chip design. A novel di- agonal floorplan is integrated to enhance the data sharing between different cores in system-on-chip. Cus... Floorplan, clock network and power plan are crucial steps in deep sub-micron system-on-chip design. A novel di- agonal floorplan is integrated to enhance the data sharing between different cores in system-on-chip. Custom clock network con- taining hand-adjusted buffers and variable routing rules is constructed to realize balanced synchronization. Effective power plan considering both IR drop and electromigration achieves high utilization and maintains power integrity in our MediaSoC. Using such methods, deep sub-micron design challenges are managed under a fast prototyping methodology, which greatly shortens the design cycle. 展开更多
关键词 Physical design Fast prototyping FLOORPLAN Clock tree synthesis (CTS) Power plan Multiprocessor system-onchip (MPSoC)
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Exact Solutions of the φ^6 + φ^5 Model Using Truncated Method
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作者 YANG Jian-Song 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第2X期295-298,共4页
In this letter, the φ^6 + φ^5 model in (D + 1) dimensions can be solved by a truncated series method. A series of solitary solutions of the φ^6 + φ^5 model in (D + 1) dimensions have be obtained.
关键词 φ^6 φ^5 model solitary solutions truncated series method
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舰载点防御的崭新前景——未来点预测问题及其重要性
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作者 严蕾 《情报指挥控制系统与仿真技术》 2001年第7期7-12,共6页
反舰导弹的威胁通过一系列的改进正处在持续不断和危险的发展中,这些改进被逐步引入到四个主要方面。它们包括:物理/机械方面(更坚固的导弹弹体、弹头和其它关键部件的装甲保护、以及不敢感炸药的采用);电磁方面(“隐形”特征、改进的... 反舰导弹的威胁通过一系列的改进正处在持续不断和危险的发展中,这些改进被逐步引入到四个主要方面。它们包括:物理/机械方面(更坚固的导弹弹体、弹头和其它关键部件的装甲保护、以及不敢感炸药的采用);电磁方面(“隐形”特征、改进的电子抗干扰设备和更精确的制导算法);作战使用方面(饱和攻击和/或极短距离攻击、沿海地物杂波以及海上运输的存在);以及运动方面(速度和/或机动性的显著提高,尤其在弹道末端阶段)。 展开更多
关键词 未来点预测 反舰导弹 反导防御 改进方向 物理/机械方面 电磁方面 作战使用
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Noise Shielding Using Acoustic Metamaterials
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作者 刘斌 黄吉平 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第3期560-564,共5页
We exploit theoretically a class of rectangular cylindrical devices for noise shielding by using acoustic metamateriais. The function of noise shielding is justified by both the far-field and near-field full-wave simu... We exploit theoretically a class of rectangular cylindrical devices for noise shielding by using acoustic metamateriais. The function of noise shielding is justified by both the far-field and near-field full-wave simulations based on the finite element method. The enlargement of equivalent acoustic scattering cross sections is revealed to be the physical mechanism for this function. This work makes it possible to design a window with both noise shielding and air flow. 展开更多
关键词 general linear acoustics ULTRASONICS quantum acoustics physical effects of sound structural acoustics and vibration
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An upgraded scheme of surface physics for Antarctic ice sheet and its implementation in the WRF model 被引量:2
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作者 Yao Yao Jianbin Huang +1 位作者 Yong Luo Zongci Zhao 《Science Bulletin》 SCIE EI CAS CSCD 2016年第7期576-584,共9页
Regional climate models often lack detailed description of ice sheet surface and, as a result, are limited in their capability to provide useful information for Antarctic climate research and field campaigns. In this ... Regional climate models often lack detailed description of ice sheet surface and, as a result, are limited in their capability to provide useful information for Antarctic climate research and field campaigns. In this study, an upgraded scheme of surface physics for Antarctic ice sheet(IST) is developed to improve the surface temperature simulations in Antarctica. Through stand-alone simulations, IST shows advantages over the Noah glacial module, a commonly utilized scheme in the widely used Weather Research and Forecasting(WRF) model. These improvements are mainly attributed to the incorporation of detailed snow physics and optimized surface layer parameterization, which results in better simulations of both the surface albedo in summer and the turbulent sensible heat flux in winter. When coupled with IST instead of Noah,WRF models show improved simulation of surface temperatures throughout the year. The bias and root-meansquare-error of annual mean surface temperatures are reduced from 5.7 and 6.0 to 0.2 and 2.7 K. 展开更多
关键词 Regional climate model ANTARCTICA Surface temperature Ice sheet
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An improved artificial physics approach to multiple UAVs/UGVs heterogeneous coordination 被引量:8
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作者 LUO QiNan DUAN HaiBin 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第10期2473-2479,共7页
This paper proposed an improved artificial physics(AP)method to solve the autonomous navigation problem for multiple unmanned aerial vehicles(UAVs)/unmanned ground vehicles(UGVs)heterogeneous coordination in the three... This paper proposed an improved artificial physics(AP)method to solve the autonomous navigation problem for multiple unmanned aerial vehicles(UAVs)/unmanned ground vehicles(UGVs)heterogeneous coordination in the three-dimensional space.The basic AP method has a shortcoming of easily plunging into a local optimal solution,which can result in navigation fails.To avoid the local optimum,we improved the AP method with a random scheme.In the improved AP method,random forces are used to make heterogeneous multi-UAVs/UGVs escape from local optimum and achieve global optimum.Experimental results showed that the improved AP method can achieve smoother trajectories and smaller time consumption than the basic AP method and basic potential field method(PFM). 展开更多
关键词 artificial physics heterogeneous coordination unmanned aerial vehicle (UAV) unmanned ground vehicle (UGV) au-tonomous navigation obstacle avoidance
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Re-examining Photodetachment of H^- near a Spherical Surface using Closed-Orbit Theory
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作者 尤晓鹏 杜孟利 《Communications in Theoretical Physics》 SCIE CAS CSCD 2016年第3期354-360,共7页
Photodeachment of H^-near a reflective spherical surface was studied by Haneef et al.[J.Phys.B:At.Mol.Opt.Phys.44(2011)195004]using a theoretical imaging method.The total cross section displays interesting oscillation... Photodeachment of H^-near a reflective spherical surface was studied by Haneef et al.[J.Phys.B:At.Mol.Opt.Phys.44(2011)195004]using a theoretical imaging method.The total cross section displays interesting oscillations.Here we re-examine the total photodetachment cross section of this system by directly applying the standard closed-orbit theory.Our result for the total cross section differs from the result obtained by Haneef et al.The difference between the two results vanishes in the limit of large radius of the reflective sphere.We argue that the theoretical imaging method developed originally for photodetachment near a Hat surface can not be directly applied to the present system. 展开更多
关键词 PHOTODETACHMENT hydrogen negative ion
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The stress-velocity relationship of twinning partial dislocations and the phonon-based physical interpretation 被引量:1
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作者 YuJie Wei ShenYou Peng 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2017年第11期11-23,共13页
The dependence of dislocation mobility on stress is the fundamental ingredient for the deformation in crystalline materials. Strength and ductility, the two most important properties characterizing mechanical behavior... The dependence of dislocation mobility on stress is the fundamental ingredient for the deformation in crystalline materials. Strength and ductility, the two most important properties characterizing mechanical behavior of crystalline metals, are in general governed by dislocation motion. Recording the position of a moving dislocation in a short time window is still challenging, and direct observations which enable us to deduce the speed-stress relationship of dislocations are still missing. Using large-scale molecular dynamics simulations, we obtain the motion of an obstacle-free twinning partial dislocation in face centred cubic crystals with spatial resolution at the angstrom scale and picosecond temporal information. The dislocation exhibits two limiting speeds: the first is subsonic and occurs when the resolved shear stress is on the order of hundreds of megapascal. While the stress is raised to gigapascal level, an abrupt jump of dislocation velocity occurs, from subsonic to supersonic regime. The two speed limits are governed respectively by the local transverse and longitudinal phonons associated with the stressed dislocation, as the two types of phonons facilitate dislocation gliding at different stress levels. 展开更多
关键词 dislocation mobility transverse and longitudinal phonons subsonic and supersonic velocity stress-velocity relationship molecular dynamics
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Exact mathematical formulas for wall-heat flux in compressible turbulent channel flows
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作者 Peng Zhang Yubin Song Zhenhua Xia 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2022年第1期81-90,共10页
In this paper,several exact expressions for the mean heat flux at the wall(qw)for the compressible turbulent channel flows are derived by using the internal energy equation or the total energy equation.Two different r... In this paper,several exact expressions for the mean heat flux at the wall(qw)for the compressible turbulent channel flows are derived by using the internal energy equation or the total energy equation.Two different routes,including the FIK method and the RD method,can be applied.The direct numerical simulation data of compressible channel flows at different Reynolds and Mach numbers verify the correctness of the derived formulas.Discussions related to the different energy equations,and different routes are carried out,and we may arrive at the conclusion that most of the formulas derived in the present work are just mathematical ones and that they generally are lacking in clear physical interpretation in our opinion.They can be used to estimate qw,but might not be suitable for exploring the underlying physics. 展开更多
关键词 Mathematical formula Wall heat flux Compressible turbulent channel flows
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