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由于快速列车与城市地铁的发展,饱和土隧道内集中荷载作用的反应问题日显重要。Green函数对辐射条件的满足,积分方程的精确解答,Dirichlet条件下的通用性,使它对隧道内动荷载作用的土动力反应问题计算有着特有的优越性,作者根据已求得两相饱和介质Green函数,利用Lamb积分公式,结合隧道断面特征,以解析积分法推导了集中冲击荷载与简谐荷载圆形断面隧道内振动位移反应表达式闭合解、反应时程曲线、瞬态和稳态的振动形态;并根据它们的单位脉冲响应函数结合Duhamel积分求得隧道在地震荷载作用下的动力反应。另外窗形隧道受集中冲击荷载作用相关弹性波时程曲线也在文中给出。 相似文献
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本文针对神火600MW机组,对汽轮机冷态和热态启动过程中冲转参数的选择展开讨论,解答了在冲转前和冲转后如何使机组能够实现平稳冲转和升速至额定转速中的问题,为全国其他相似机组的启动过程中冲转参数的选择提供了有效的借鉴。 相似文献
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跑、冒、滴、漏是汽轮机油系统常见缺陷,本文列举了跑、冒、滴、漏的影响因素,指出了其产生的危害,最后根据邹县电厂近年来油系统发生的典型缺陷,总结了跑、冒、滴、漏的治理措施。 相似文献
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本文介绍了“望、闻、问、切”四种测量手段。通过这四种方法,可以对在用的水平螺翼式水表的运行状况进行分析。 相似文献
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微波消化-原子吸收光谱法测定中成药中Cu、Pb、Hg、As 总被引:1,自引:1,他引:0
本文建立了微波消化-原子吸收光谱法测定中成药中Cu、Pb、Hg、As的方法。四种元素方法的相对标准偏差RSD%为2-4.8%,回收率在90~110%之间,定量检出限分别为6.8μgCu/g(干态)、0.41μg Pb/g(干态)、0.13μg As/g(干态)、0.1μg Hg/g(干态)。 相似文献
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本论文通过物理宇宙公式的物数学、宇环、宇三角,描述了“本来无一物,何处惹尘埃”的“统一场”:“空即是色,色即是空”的“中空0”;“无中生有,有会变无,一生万物,物极必反”的“01010阴阳二进制”:“来自于尘土,又归于尘土”的“万物互变与轮回”的食物链哲学、科学、佛法、迷信之间的关系:“△E=0”的绝对0空间(实空)和“△Et=△E-△EY=0”的相对0空间(虚空):及物、时、空三者共体互生互灭互相牵锁调和稳态的生命灵性关系式:V^2=M/○Km=△EL/○K=○1/○K=△E=F=a或:①/V^2=M=T,^2=①K。 相似文献
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从广告版面设计的基础上,阐述了广告版面设计中点、线、面的应用与形式作用,论证了在版面中掌握好这3个要素的重要性,以及在版面空间设计具有的动力. 相似文献
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《中国新技术新产品》2017,(23)
随着我国供电企业的不断发展,其管理模式也发生了极大的变化,当前,大多数供电企业都开始引入输、变、配电专业一体化的管理模式,这一管理模式可有效提高业务的专业化水平,实现精细化、集约化管理的目标,是当代电网改革的必然趋势。本文就针对实施输、变、配电专业一体化管理进行了分析和研究。 相似文献
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The ozonation of a solution of C60 in toluene results in the formation of several unstable compounds C60X and C60Y[1-5] which decay completely at room temperature within about 1 h. The products are oxides C60O[6,6], C60O2[I], C60O2[II], and possibly an isomer of C60O3. The transformations are not due to oxidation by atmospheric oxygen but are spontaneous. The ozonation of a solution of C60O[6,6] in toluene results in the formation of two unstable compounds C60Z[1-2] which also decay completely to C60O2[I] and C60O2[II]. It is suggested that all unstable “parents” are ozonides. 相似文献
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《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(1):71-76
The ozonation of a solution of C60 in toluene results in the formation of several unstable compounds C60X and C60Y[1–5] which decay completely at room temperature within about 1 h. The products are oxides C60O[6,6], C60O2[I], C60O2[II], and possibly an isomer of C60O3. The transformations are not due to oxidation by atmospheric oxygen but are spontaneous. The ozonation of a solution of C60O[6,6] in toluene results in the formation of two unstable compounds C60Z[1–2] which also decay completely to C60O2[I] and C60O2[II]. It is suggested that all unstable “parents” are ozonides. 相似文献
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Sushilov NV Tavakkoli J Cobbold RS 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2001,48(1):274-284
Based on the method proposed by Donnelly and Ziolkowski [1], [2], a new general solution has been obtained for the isotropic/homogeneous scalar wave equation in cylindrical coordinates. It is shown that well-known limited diffraction beams such as Durnin's Bessel beams [4], Lu and Greenleaf's X-wave [15], localized waves of Donnelly and Ziolkowski [1], [2], and limited-diffraction, band-limited waves of Li and Bharath [19], [20] can be obtained from this generic solution as particular cases. In addition, we have obtained new X-wave solutions and have calculated the field characteristics for one of them using a finite aperture realization. It is shown that with a proper choice of the free parameter values, well-behaved X-waves with narrow beamwidths and large depths of field can be achieved. For similar source spectra, the results are compared with Lu and Greenleaf's zeroth-order X-wave, and it is shown that the depth of field and beamwidth are very comparable. 相似文献
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均布载荷作用下圆薄板的自由振动 总被引:1,自引:0,他引:1
本文讨论了均布载荷作用下圆薄板在非线性弯曲静平衡构形附近的微幅自由振动。静平衡问题采用文献[2]给出的精确解,在此基础上用修正迭代法求解,得到了其固有频率-载荷特征关系。 相似文献
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在文献[4-7]的基础上,本文导出了卡诺制冷机的Yong损率与制冷系统间的关系,并且分析了各种因素对该关系的影响。 相似文献
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A novel formulation of the magnetic vector potential method for three dimensional magnetostatic field calculations is derived. Rigorously defining the interface and boundary conditions of the gauge of the vector potential, the new method gives a unique solution to the problem. The new field equation does not contain the gauge condition against the usual formulations[1], [2], [3], and takes the form of the diffusion equation. Computed results are favorably compared with the analytic solution of a test problem. This formulation is directly applicable to three dimensional eddy current problems. 相似文献
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冲击载荷作用下大挠度圆板的弹塑性动力分析 总被引:2,自引:1,他引:1
本文利用已知弹性解分析阶跃载荷作用下大挠度回板的弹塑性动力响应,提出了本征函数法。这是对文献[3,4]的进一步发展。此外在文献[3,4]中,解决大挠度问题时,采用基于卡门方程的混合法,但在本文中,采用了位移法,它在进行分析计算时更为有利。 相似文献
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线性矩阵方程(ATXA,BTXB)=(C,D) 的反对称解 总被引:5,自引:0,他引:5
利用矩阵对[A,B]的商奇异值分解(QSVD),建立了线性矩阵方程(A^TXA,B^TXB)=(C,D)反对称解存在的充分必要条件,并给出了通解的表达式,同时导出了此方程的最小二乘反对称解的表达式。 相似文献