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用类比演绎概念 用直观化解抽象——关于“电势能和电势”的教学设计 被引量:3
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作者 王治国 《物理教学探讨》 2019年第4期28-31,36,共5页
通过对"电势能和电势"教学中存在问题的分析,用问题探究的方式,从直观教学的角度,运用"实验""多媒体""类比迁移""公式量化"等多种形象直观的教学策略,对"电势能和电势"的... 通过对"电势能和电势"教学中存在问题的分析,用问题探究的方式,从直观教学的角度,运用"实验""多媒体""类比迁移""公式量化"等多种形象直观的教学策略,对"电势能和电势"的教学进行了科学有效的设计,既帮助学生深刻理解了"电势能和电势"的概念,又让学生学会了抽象物理概念的建构方法,真正达到了促进学生科学素养养成的目的。 展开更多
关键词 电场中的能量 研究方法 电势能 电场能的性质
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“负负得正”——巧记电场中的功能关系
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作者 严灿云 《物理教学探讨(中学教学教研版)》 2013年第3期31-32,共2页
讲授新课——静电场时,教师往往也是利用重力势能来帮助理解电势能。但因为电荷有正负之分,所以电场能的性质就显得比较复杂了。其实,学电场的能的性质有妙法,因为在电场中存在一系列“负负得正”规律,虽谈不上科学,但很好理解,... 讲授新课——静电场时,教师往往也是利用重力势能来帮助理解电势能。但因为电荷有正负之分,所以电场能的性质就显得比较复杂了。其实,学电场的能的性质有妙法,因为在电场中存在一系列“负负得正”规律,虽谈不上科学,但很好理解,有助于帮助学生理解记忆。 展开更多
关键词 静电场 能的性质 “负负得正”规律
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静电场复习之策略
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作者 程佳琦 《神州》 2019年第2期66-67,共2页
通过对静电场知识点分析、归纳、总结,做到熟练掌握,运用多变,提高应变能力,从而达到高考超常发挥。
关键词 电荷 电荷守恒定律 的性质 能的性质 电容器 带电粒子在电场中的运动
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Gender differences in ghrelin, nociception genes, psychological factors and quality of life in functional dyspepsia 被引量:16
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作者 Yoon Jin Choi Young Soo Park +4 位作者 Nayoung Kim Yong Sung Kim Sun Min Lee Dong Ho Lee Hyun Chae Jung 《World Journal of Gastroenterology》 SCIE CAS 2017年第45期8053-8061,共9页
AIM to evaluate gender differences in the aspect of ghrelin,nociception-related genes and psychological aspects and the quality of life(Qo L) in Korean functional dyspepsia(FD) patients.METHODS Total of 191 persons we... AIM to evaluate gender differences in the aspect of ghrelin,nociception-related genes and psychological aspects and the quality of life(Qo L) in Korean functional dyspepsia(FD) patients.METHODS Total of 191 persons were prospectively enrolled between March 2013 and May 2016 in Seoul National Bundang Hospital,and classified into control and FD group based on ROME Ⅲ criteria. Questionnaire included assessment for dyspepsia symptoms,Qo L and anxiety or depression. Preproghrelin and nociception genes in the gastric mucosa and plasma acyl/des-acyl ghrelin were measured. RESULTS Lower level of plasma acyl ghrelin in FD patients compared to control was significant only in male(15.9 fmol/m L vs 10.4 fmol/m L,P = 0.017). Significantly higher m RNA expressions of nerve growth factor and transient receptor potential vanilloid receptor 1 were observed in male(P = 0.002 and P = 0.014,respectively) than in female. In contrast,female FD patients had a higher anxiety and depression score than male FD(P = 0.029),and anxiety score was correlated with epigastric pain only in female FD patients(female: Spearman rho = 0.420,P = 0.037). The impairment of overall Qo L was more prominent in female FD patients than male patients(5.4 ± 0.3 vs 6.5 ± 0.3,P = 0.020). CONCLUSION Gender differences of ghrelin and nociception-related genes in male and psychological factors in female underlie FD symptoms. More careful assessment of psychological or emotional status is required particularly for the female FD patients. 展开更多
关键词 Functional dyspepsia Gender differences Quality of life
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Transport properties of dilute ammonia-noble gas mixtures from new intermolecular potential energy functions
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作者 Farshid Zargari Delara Mohammad-Aghaie +3 位作者 Maryam Lotfi Masoume Ghorbanipour Mohammad Mehdi Alavianmehr Omolbanin Shahraki 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第12期1727-1734,共8页
Previously we have determined the dilute mixture transport properties of slightly polar fluorocarbons using the inverted intermolecular potential energies(Ind. Eng. Chem. Res. 45(2006) 9211–9223). In the present pape... Previously we have determined the dilute mixture transport properties of slightly polar fluorocarbons using the inverted intermolecular potential energies(Ind. Eng. Chem. Res. 45(2006) 9211–9223). In the present paper, the corresponding states correlations for reduced viscosity collision integrals were employed to obtain effective unlike interaction potential models for dilute binary mixtures of highly polar molecule ammonia with noble gases.The inverted potentials were fitted to the Morse–Spline–van der Waals(MSV), model potential. The method of least-squares fitting was then applied to identify best consistence force parameters for each ammonia-noble gas mixture, taking advantage of experimental viscosities, diffusion coefficients and thermal conductivities.The proposed potential models were compared with those obtained from other sources, in order to assess the extent of their validity.The potentials were later employed to calculate transport properties of the studied mixtures. Then, results were compared with those reported in the literature, which led to the acceptable agreement. 展开更多
关键词 lntermolecular potential energy Transport properties Inversion pmcedure Mixture Ammonia Noble gas
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Soil Uncertainties on Performance of Geotechnical Works
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作者 Michele Maugeri Salvatore Grasso 《Journal of Civil Engineering and Architecture》 2010年第5期37-47,共11页
Performance-Based Design (PBD) is a more rational approach, particularly in seismic environments. In this approach it is relevant the performance required to structures and to geotechnical works, as well as the geot... Performance-Based Design (PBD) is a more rational approach, particularly in seismic environments. In this approach it is relevant the performance required to structures and to geotechnical works, as well as the geotechnical constitutive models used to predict the performance. The parameters of the constitutive models are related in turn to soil properties. So soil properties are a key point for Performance-Based Design. Questions arising are: (i) which are the more relevant soil properties to solve a specific PBD geotechnical problem? (ii) which are the more relevant model parameters and how they can be evaluated and/or correlated to soil properties? (iii) which is the role of the soil parameters uncertainty in Performance-Based Design? An answer to these questions is given in this paper, outlining the potential offered by the new advanced in-situ and laboratory tests and discussing the performance required by some geotechnical works. 展开更多
关键词 Performance Based Design (PBD) soil properties geotechnical works physical environment.
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