钢筋混凝土梁非线性有限元分析在实际工程中的应用

文章利用有限元分析软件ANSYS对实际工程中的梁进行非线性分析,介绍了ANSYS中钢筋混凝土梁建模过程,并对其性能进行评价,对实际工程提出了建议:应对PKPM直接生成的梁配筋进行修正,否则会造减框架结构中梁超强.     

汽车制动性系统检测常见问题及解决措施

汽车制动性能的好坏,直接关系到行车安全,它是汽车安全行驶中的重点项目之一.对其进行及时准确的检测是保证道路交通安全的必要手段.文章针对路试检验汽车制动性能的常见问题进行了探讨.     

提问是记者的天职——电视新闻采访技巧探析

对新闻记者来说,在采访过程中最重要的环节是提问、发问."提问是记者的天职"这几乎是所有教科书和新闻实践中关于采访的圣经般的概述.作为电视记者,发出疑问,为问题寻找答案,以此寻求事实真相更为重要.如果说摄影机代表观众的眼睛,那么,电视记者就代表观众的嘴巴,你提出问题,并把当事人的答复传递给观众.     

浅析中学历史教学中的人物教学

在中学历史教学中，人物教学是整个教学的重要组成部分。如何在课堂教学中运用正确的观点，采用恰当的方法，通过人物教学，培养学生的思维能力，提高学生的思想品德素质，是我们历史课堂教学研究的重要课题之一，现就此谈谈自己的看法。     

Redox modulated hydrogelation of a self-assembling short peptide amphiphile

Hydrogels resulting from the self-assembly of small peptides are smart nanobiomaterials as their nanostructuring can be readily tuned by environmental stimuli such as pH,ionic strength and temperature,thereby favoring their practical applications.This work reports experimental observations of formation of peptide hydrogels in response to the redox environment.Ac-I 3 K-NH 2 is a short peptide amphiphile that readily self-assembles into long nanofibers and its gel formation occurs at concentrations of about 10 mmol/L.Introduction of a Cys residue into the hydrophilic region leads to a new molecule,Ac-I 3 CGK-NH 2,that enables the formation of disulfide bonds between self-assembled nanofibers,thus favoring cross-linking and promoting hydrogel formation.Under oxidative environment,Ac-I 3 CGK-NH 2 formed hydrogels at much lower concentrations(even at 0.5 mmol/L).Furthermore,the strength of the hydrogels could be easily tuned by switching between oxidative and reductive conditions and time.However,AFM,TEM,and CD measurements revealed little morphological and structural changes at molecular and nano dimensions,showing no apparent influence arising from the disulfide bond formation.     

个体主义集体主义文化价值理论的细化和发展——以广告研究为例

个体主义集体主义二元文化价值理论已经发展成为垂直性和平行性的个体主义和集体主义的四维体系。本文梳理了该理论的发展,并以广告研究为例,在新的理论框架下,讨论如何预测多种消费行为和消费满意。研究结果表明垂直性和平行性的细分有助于更好地理解个体主义/集体主义理论解释下的已知现象。虽然在起动方法上存在挑战,以等级和地位为动机的文化模式研究在未来势必会成为新的研究热点,丰富跨文化理论的研究内容。     

区域约束混凝土柱受往复荷载裂缝分析

区域约束混凝土是在对普通钢筋约束混凝土研究的基础上提出来的,是对钢筋约束混凝土结构新形式的探讨,文章对3根柱受往复荷载的试验产生的裂缝进行分析,得出区域约束混凝土这种约束形式能使得柱有更好的抗往复荷载性能.     

Synthesis process of Ba-ferrites from α-FeOOH and γ-FeOOH and investigation of magnetic properties

The claviform BaFe₁₂O₁₉ crystals were synthesized by the precipitation-toptactic reaction method using α-FeOOH and γ-FeOOH as raw materials respectively. The synthesis processes of BaFe₁₂O₁₉, studied by XRD, SEM, EDS, FT-IR, and TG-DTA techniques, included preparations of precursor γ and precursor α, formations of α-Fe₂O₃ and BaFe₂O₄, and production of rod-like BaFe₁₂O₁₉ through dehydroxylation of pod-like FeOOH, followed by reactions of α-Fe₂O₃ with BaCO₃ and BaFe₂O₄. The crystallinity of α-Fe₂O₃ and BaCO₃ from precursor α was better than from precursor γ due to the direct dehydroxylation of α-FeOOH, resulting in a lower nucleation rate and better crystallinity of BaFe₂O₄. BaFe₁₂O₁₉ prepared from precursor α showed lower crystallinity and purity with a higher length-diameter ratio than from precursor γ. The VSM results proved that the appearance of final products had an important influence on magnetic properties.     

GPS测量技术在工程测绘中的应用探析

GPS测量技术的出现和不断发展,极大地促进了测绘工作的进步,不仅使测绘的工作方式发生了根本性的变革,也大大提高了工程测绘的工作效率、拓宽了工程测绘的服务范围。文章首先探析了GPS在工程测绘中的特点,论述了GPS测量技术在工程测绘中的应用等,有一定的理论价值和现实意义,供同行借鉴。     

On the Differences in Single- walled Carbon Nanotubes and Multi- walled Carbon Nanotubes

碳纳米管作为最重要的纳米材料之一,其研究越来越得到人们的重视.文章主要综述了单壁碳纳米管和多壁碳纳米管的差异.