高中生化学探究学习能力及其培养

培养学生的探究学习能力是高中化学教学的重要课题.教师在教学过程中根据教学内容和学生实际优化实验,创设教学情境,进行开放性教学,鼓励合作探究并重构评价方式,从而不断提高学生的探究学习能力.     

解析《天堂》的后现代叙事特征

《天堂》体现了非线性叙述和开放性的后现代叙事特征。叙事的片段化、多次反复性等叙事手法,是莫里森对美国黑人＂破碎＂历史的解读;小说中的叙事空白,人物身份的不确定,男性声音与女性声音交替错杂,促使读者充分参与文本的建构,从而引发读者的思考,深刻体会莫里森对黑人祖先那种既骄傲又沉痛和担忧的心理。     

精神性与物质性的尴尬——关于“今楷”创作思潮的探讨

“今楷”创作思想,是以旭宇先生为首的中国书协楷书专业委员会于2007年石家庄全国楷书创作会议上提出的,在当代书坛影响很大,已经形成一种思潮。本着“百家争鸣”的态度参与这一思潮的讨论,就书法创作中形式技巧的运用与审美诉求的关系,对“今楷”的打造在物质性和精神性两方面的合理性加以论证,是十分必要的。     

浅析低碳校园的建设与管理

发展低碳经济是国家可持续发展的重大战略部署,高等学校应积极响应国家的战略号召,加快节能建筑及低碳校园建设,引导师生实现低碳校园的生活方式,引领并积极参与低碳社会、低碳城市建设。     

均匀带电薄圆盘和薄宽圆环静电势的数值研究

用叠加原理和数值积分法,分别对均匀带电薄圆盘和薄宽圆环的静电势进行数值研究.绘制了电势的空间分布图及其等势线图.     

欧美国家广播电视管理型态研究

以美、法、英、德、加拿大等国为范例,对五种不同的欧美国家广播电视行政管理型态及其原则与职责作横向的比较研究,揭示它们作为国家广播电视行政管理模式的多样性,揭示其相同特征：均以宪法、法律为基础,在民主宪政框架内奉行“公共服务”的核心理念,保障公众利益在传媒领域的体现,以及独立行政、自治、多元主义、社会利益集团高度参与性等发展总趋势。     

Effects of La^3＋on microwave dielectric properties of（Pb0.5Ca0.5）（Fe0.5Ta0.5）O3ceramics

This work investigated the microwave dielectric properties of A-site substitution by rare earth La3+in(Pb0.5Ca0.5)(Fe0.5Ta0.5)O3(PCFT) system.A single perovskite phase was obtained only when the doping content was 2%.Suitable La3+ doping improved microwave dielectric performances.Excessive La3+doping caused the formation of secondary phase,which resulted in the decreasing of permittivity εrand quality factor Qfvalues.Especially,when the doping content is 2%-5%,permittivity εrwas above 75 and Qfvalues were 6...     

4-component 2-D CFDFD method in analysis of lossy circular waveguide with fractal rough surface

In this paper, equivalent surface impedance boundary condition (ESIBC), which takes fractal parameters (D, G) into SIBC, is implemented in the 4-component 2-D compact finite difference frequency domain (2-D CFDFD) method to an- alyze the propagation characteristics of lossy circular waveguide with fractal rough surface based on Weierstrass-Mandelbrot (W-M) function. Fractal parameters’ effects on attenuation constant are presented in the 3 mm lossy circular waveguide, and the attenuation constants of the fi...     

Global existence and blow-up of solutions to reaction-diffusion system with a weighted nonlocal source

In this paper, we study a semi-linear reaction-diffusion system with a weighted nonlocal source, subject to the null Dirichlet boundary condition. Under certain conditions, we prove that the classical solution exists globally and blows up in finite time respectively, and then obtain the uniform blow-up rate in the interior.     

Rotenone induces more serious learning and memory impairment than α-synuclein A30P does in Drosophila

Parkinson’s disease (PD) is a heterogenous disease caused by multifactorial etiology. PD is characterized by the loss of dopaminergic (DA) neurons in the substantia nigra and the accumulation of Lewy bodies. In this study, two Drosophila PD models by exposing Drosophila to rotenone (sporadic PD models) are proposed, and the human α-synuclein A30P protein (family PD models) in Drosophila is expressed respectively. Both models recapitulated the main human PD symptoms including the loss of dopaminergic neurons...