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小学体育课后服务的实施困境及其突破

教学与管理 2024年第17期 18-21页

作者：伊剑吴晓华许强民首都师范大学体育教研部河北体育学院冰雪运动系北京师范大学实验小学

体育课后服务是指学校在有关教育部门的指导下,与体育课教学模式、体育课堂教学模式和育人作用相同的校外培训机构、体育组织等合作,为学生提供课堂外多样式的体育活动服务,对学生的体育特长培养、身心健康发展、体育参与等方面有较大... 详细信息

体育课后服务是指学校在有关教育部门的指导下,与体育课教学模式、体育课堂教学模式和育人作用相同的校外培训机构、体育组织等合作,为学生提供课堂外多样式的体育活动服务,对学生的体育特长培养、身心健康发展、体育参与等方面有较大的帮助。目前,小学体育课后服务中存在的问题主要表现在“任务不清,时间不明”“家长参评不够”“安全保障不够”“学生盲从,动力不足”。究其原因在于,公众对小学体育课后服务的认知出现偏差、社会评价体系的滞后及相关法律条文的缺失。突破小学体育课后服务困境并保证其有效实施,需要家—校—社协同参与、建立权责明确的工作机制、完善相关法律制度、加大小学体育课后服务投入,从而全面提升小学体育课后服务的质量和效果。

关键词：小学体育课后服务家校协同育人

Nonlocality and Entanglement

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Communications in Theoretical Physics 2007年第4期47卷 617-620页

作者： wu xiao-hua Department of Physics Sichuan University Chengdu 610064 China

By constructing a series of mixture, which is inseparable but satisfies the Mermin-Klyshko inequality, for the N-qubit system, we prove that ＂violation of the Mermin-Klyshko inequality＂ is not equivalent to ＂the st... 详细信息

关键词： nonlocality entanglement

Nonlocality Proof for Two-Particle Systems in 33 Hilbert Space

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Communications in Theoretical Physics 2001年第10期36卷 395-398页

作者： wu xiao-hua Department of Physics and Center for Theoretical Physics Nanjing University Department of Physics Sichuan University

For a two-particle system in 3 3 Hilbert space, we derive a new type of inequality for local hidden variable model. Using an entangled state, we give a realizable experiment whose joint probabilities violate the inequ... 详细信息

关键词： nonlocality 3 ⊗ 3 Hilbert space

Entanglement Criterion of N-Qubit State

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Communications in Theoretical Physics 2006年第4期45卷 601-604页

作者： ZHANG hua wu xiao-hua Department of Physics Sichuan University Chengdu 610064 China

In this paper, we shall develop a generic scheme to construct the criterion that an N-qubit state has true N-particle entanglement. For the N = 3 case, we show that violation of the Mermin＇s inequality │ E^LHV （σ^ x× σ^ y× σ^y ＋ σ^y × σ^x×σ^y ＋ σ^y ×σ^y× σ^x＆ -σ^x × σ^x ×σ^x）│≤2, is sufficient to confirm three-particle entanglement.

关键词： N-particle entanglement Mermin's inequality

Inseparable Criterion and Bell Inequality

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Communications in Theoretical Physics 2005年第3X期44卷 451-454页

作者： WEI Kai-Yi wu xiao-hua Department of Physics Sichuan University Chengdu 610064 China

In this letter, we shall show how to construct constrained Bell-type inequality for a generaltwo-party system, and violating this inequality is equivalent to being inseparable. For 2 (×) 2 system, the maximum violati... 详细信息

关键词： Bell inequality inseparable criterion

A SPLIT-CHARACTERISTIC FINITE ELEMENT MODEL FOR 1-D UNSTEADY FLOWS

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Journal of Hydrodynamics 2007年第1期19卷 54-61页

作者： ZHOU Yi-lin TANG Hong-wu LIU xiao-hua State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China.

An efficient and accurate solution algorithm was proposed for 1-D unsteady flow problems widely existing in hydraulic engineering. Based on the split-characteristic finite element method, the numerical model with the Saint-Venant equations of 1-D unsteady flows was established. The assembled f＇mite element equations were solved with the tri-diagonal matrix algorithm. In the semi-implicit and explicit scheme, the critical time step of the method was dependent on the space step and flow velocity, not on the wave celerity. The method was used to eliminate the restriction due to the wave celerity for the computational analysis of unsteady open-channel flows. The model was verified by the experimental data and theoretical solution and also applied to the simulation of the flow in practical river networks. It shows that the numerical method has high efficiency and accuracy and can be used to simulate 1-D steady flows, and unsteady flows with shock waves or flood waves. Compared with other numerical methods, the algorithm of this method is simpler with higher accuracy, less dissipation, higher computation efficiency and less computer storage.

关键词： split characteristic finite element method,tri-diagonal matrix algorithm 1-D unsteady flow flood wave,river networks

Two-Quark Condensate Changes with Quark Current Mass

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Communications in Theoretical Physics 2009年第9期52卷 483-486页

作者： LU Chang-Fang LU xiao-Fu wu xiao-hua ZHAN Yong-Xin Department of Physics Sichuan University Chengdu 610064 China Department of Physics Sichuan Agricultural University Ya＇an 625014 China Institute of Theoretical Physics The Chinese Academy of Sciences Beijing 100080 China CCAST （World Laboratory） P.O. Box 8730 Beijing 100080 China

Using the Schwinger Dyson equation and perturbation theory,we calculate the two-quark condensates forthe light quarks u,d,strange quark s and a heavy quark c with their current masses *** results show thatthe two-quark condensate will decrease when the quark mass increases,which hints the chiral symmetry may be restoredfor the heavy quarks.

关键词： quark current mass quark condensates QCD sum rule Schwinger-Dyson equation perturbation theory

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高层住宅外墙门窗安装工艺与防渗漏措施探讨

工程建设与设计 2024年第3期 171-173页

作者：秦湜王涛魏要坤吴晓华中国建筑第二工程局有限公司华南分公司广东深圳518000

研究了高层住宅外墙门窗安装工艺与防渗漏措施,从施工准备、门窗框安装、门窗扇安装、玻璃安装、成品保护等主要环节着手,分析了门窗安装工艺技术要点,并对因设计原因、材料原因、施工原因而产生的渗漏问题进行剖析,并提出了针对性的处... 详细信息

研究了高层住宅外墙门窗安装工艺与防渗漏措施,从施工准备、门窗框安装、门窗扇安装、玻璃安装、成品保护等主要环节着手,分析了门窗安装工艺技术要点,并对因设计原因、材料原因、施工原因而产生的渗漏问题进行剖析,并提出了针对性的处理措施,以提高外墙门窗防渗漏效果,更好地满足住宅使用需求。

关键词：高层住宅外墙门窗安装工艺防渗漏措施

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Improvement of the Injection and Transport Characteristics of Electrons in Organic Light-Emitting Diodes by Utilizing a NaC1 N-Doped Layer

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Chinese Physics Letters 2014年第4期31卷 178-181页

作者： xiao Zhi-Hui wu xiao-Ming hua Yu-Lin WANG Li BI Wen-Tao BAI Juan-Juan MU Xue YIN Shou-Gen School of Materials Science and Engineering Tianjin University of Technology Tianjin 300384Key Laboratory of Display Materials and Photoelectric Devices .Ministry of Education Tianjin 300384 Tianjin Key Laboratory of Photoelectric Materials and Devices Tianjin 300384

The injection and transport characteristics of electrons are enhanced by using sodium chloride （NaC1） as an n-type dopant doped into a 4, 7-diphnenyl-1, lO-phe-nanthroline （Bphen） electron-transporting layer, which improves the performance of organic light-emitting diodes （OLEDs）. Meanwhile, a NaCl-doped Bphen layer can effectively influence electrical characteristics of the devices, and significantly improve the current and power efficiency. The turn-on voltage and the operation voltage of the optimal device are decreased drastically from 6.5 V and 10.8 V to 3.3 V and 5 V, respectively, compared with those of the reference device. The maximum current efficiency and power efficiency of the optimal device are 7.0 cd/A and 4.4 Im/W at the current density of 16.70 mA/cm~, which are about I. 7 and 4 times higher than those of the reference device, respectively. Moreover, the enhancement of the injection and transport ability for electrons is attributed not only to the reduced energy barrier between A1 cathode and Bphen, but also to the increased mobility of electrons by the doping effect of NaCl. Therefore, both the electron injection and transport ability are enhanced, which improve the carrier balance in OLEDs and lead to the better device efficiency.

关键词： ORGANIC light emitting diodes SALT DOPING agents (Chemistry) ENERGY consumption ELECTRON mobility