8mm微波辐射对小鼠运动能力影响的初步研究     

陈静侬  杨旸 《广州体育学院学报》2002,22(2):26-28

目的：探讨通信微波对生物运动能力的影响效应。方法：将小鼠暴露于通信微波(波长8毫米，频率35．6GHz，平均功率密度7．4—29．4mW/cm2)，比较观察小鼠游泳耐力、血液中白细胞凋亡率及小鼠血乳酸、血红蛋白含量及血浆中SOD水平的变化。结果：经微波连续暴露后，小鼠游泳时间较对照组有缩短的趋势，达到显著性差异，SDH、LDH活性下降。运动后小鼠血乳酸比对照组显著增加。结论：通信微波可以通过多种途径影响生物的运动能力。  相似文献   

地球辐射带的膨胀和收缩Ⅱ     

延三成 《职大学报》2006,(2):1

本文论述地球辐射带的膨胀和收缩的范围:当地球从近日点运动到远日点时,地球辐射带向外膨胀;当地球从远日点运动到近日点时,地球辐射带向内收缩。其膨胀或收缩范围是:第一层辐射带大约为30m,第二层辐射带大约为80m。  相似文献   

光电耦合器及其应用     

唐红 《贵阳金筑大学学报》2006,(4)

半导体光电耦合器现已发展成为一类特殊的半导体隔离器件。它体积小、寿命长、无触点、抗干扰、能隔离,并具有单向信号传输等特点。本文介绍了光电耦合器的特点、典型结构及应用,以及简易测试方法。  相似文献   

卢瑟福模型中电子运动分析     

秦希峰  刘增良 《临沂师范学院学报》2007,29(3):24-26

关于卢瑟福模型中电子的运动是加速还是减速,不同文献给出不同描述,甚至是截然相反的描述.本文分别从能量和力的角度定量、定性地分析了卢瑟福模型中电子的运动情况,得出了卢瑟福模型中电子绕原子核旋转、辐射能量时作加速运动的结论.  相似文献   

Beta-Gamma函数对余元公式的推导与实现   总被引：1，自引：0，他引：1  

宋占奎  於全收  燕嬿  胡杰军 《陕西教育学院学报》2007,23(4):85-88

对构造的公式①,在复数域将其被积函数分解得2n个复根.在实数域将其实虚部积分取极限获证.对构造的公式②,由①将其被积函数的连续性、收敛性及一致收敛性与构造的有理数列用变量替换代入取极限获证.再由①与②应用Gamma-Beta函数的另一形式及(3),得到了余元公式的实现.  相似文献   

太赫兹时域光谱技术   总被引：1，自引：0，他引：1  

孟田华  赵国忠 《雁北师范学院学报》2007,23(3):14-17

介绍了太赫兹时域光谱技术的优势,太赫兹时域光谱系统及太赫兹时域光谱技术的原理和应用.  相似文献   

Entanglement of two-level atoms''''quantum states in a strong thermal radiation field     

ZHANG Deng-yu  XIE Li-jun  TANG Shi-qing  ZHAN Xiao-gui  GAO Feng 《商丘师范学院学报》2008,24(12)

The two-level atom is described by Pauli sign and environment is described by infinite harmonic particle thermal reservoir.We have studied the entanglement of two-level atoms which are put in the strongly thermal radiation field.The two-level atoms' reducible density rectangular array is obtained.We discuss the properties of entanglement by virtue of concurrence.It is shown that the two two-level atoms initially situated in different coherent superposition states,entanglement of atoms have obvious dissimilarity.  相似文献   

氯化锶[^89Sr]治疗肿瘤骨转移疼痛的护理     

骆佩芳  霍艳秋  盛强  张俊  丁忠旗 《泰州职业技术学院学报》2011,11(1):21-22

总结了23例氯化锶[^89Sr]注射液治疗肿瘤骨转移的护理。23例患者经ECT骨扫描检查证实骨转移病灶为单处和多处不等,主要临床表现为玩固性骨疼痛,活动能力受限。给予氯化锶[^89Sr]注射治疗,并采取以下护理措施：注射前疼痛评估,注射前心理护理,治疗后跟踪随访,不良反应的观察及应对护理等。  相似文献   

数学建模中的创造性思维     

韦健  赵翌 《桂林师范高等专科学校学报》2007,21(4):168-170

通过对比创造性思维和数学建模的基本过程,论述创造性思维在数学建模过程中的具体应用,说明建立数学模型的过程是创造性思维过程的具体体现,而创造性思维是数学建模过程的核心和灵魂。  相似文献   

University physics students’ ideas of thermal radiation expressed in open laboratory activities using infrared cameras     

Jesper Haglund  Emil Melander  Matthias Weiszflog  Staffan Andersson 《Research in Science & Technological Education》2017,35(3):349-367

Background: University physics students were engaged in open-ended thermodynamics laboratory activities with a focus on understanding a chosen phenomenon or the principle of laboratory apparatus, such as thermal radiation and a heat pump. Students had access to handheld infrared (IR) cameras for their investigations.

Purpose: The purpose of the research was to explore students’ interactions with reformed thermodynamics laboratory activities. It was guided by the research question: How do university physics students make use of IR cameras in open-ended investigation of thermal radiation as a phenomenon?

Sample: The study was conducted with a class of first-year university physics students in Sweden. The interaction with the activities of four of the students was selected for analysis. The four students are males.

Design and methods: We used a qualitative, interpretive approach to the study of students’ interaction. The primary means of data collection was video recording of students’ work with the laboratory activities and their subsequent presentations. The analysis focused on how IR cameras helped students notice phenomena relating to thermal radiation, with comparison to previous research on students’ conceptions of thermal radiation.

Results: When using the IR camera, students attended to the reflection of thermal radiation on shiny surfaces, such as polished metals, windows or a whiteboard and emissive properties of surfaces of different types. In this way, they went beyond using the technology as a temperature probe. Students were able to discuss merits and shortcomings of IR cameras in comparison with digital thermometers.

Conclusions: With the help of IR cameras, university physics students attend to thermal phenomena that would otherwise easily go unnoticed.  相似文献