排序方式: 共有34条查询结果,搜索用时 15 毫秒
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利用FTIR分析技术,对3种不同煤阶的我国电站典型动力用煤——神木烟煤、铜川贫煤和宜宾无烟煤的挥发份中氮的赋存形态进行了研究。为克服研究工作中的微氮现象,在研究过程中采用了16 m光程的长程气池。研究结果显示,红外光线在16 m长程气池构造作用下多次穿过挥发份,检测出含量微少的氮元素,成功地克服了微氮现象,取得了较好的研究结果;我国电站用煤的挥发分中氮的赋存形态有4种,分别为吡啶型氮化合物、吡咯型氮化合物、吡啶-N氧化物和腈类化合物。氮在煤与挥发分中赋存形态的差别主要是由于煤分子中的大分子量含氮结构在温度作用下发生分解所致。 相似文献
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郭兴明 《应用数学和力学(英文版)》1996,17(5):445-450
CHARACTERISTICSOFSUBDIFFERENTIALSOFFUNCTIONS(郭兴明)CHARACTERISTICSOFSUBDIFFERENTIALSOFFUNCTIONS¥GuoXingming(ReceivedJune16,1995... 相似文献
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The constitutive equation under the low-cycle fatigue (LCF) was discussed, and a two-dimensional (2-D) model for simulating fatigue crack extension was put forward in order to propose a new cyclic J-integral. The definition, primary characteristics, physical interpretations and numerical evaluation of the new parameter were investigated in detail. Moreover, the new cyclic J-integral for LCF behaviors was validated by the compact tension (CT) specimens. Results show that the calculated values of the new parameter can correlate well with LCF crack growth rate, during constant-amplitude loading. In addition, the phenomenon of fatigue retardation was explained through the viewpoint of energy based on the concept of the new parameter. 相似文献
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下半连续函数的Proximal—次微分与广义中值定理 总被引:5,自引:3,他引:2
郭兴明 《数学物理学报(A辑)》1998,18(3):324-329
该文对定义在Hilbert空间E上的一般下半连续函数证明了如[9]中形式的逼近中值定理在Proximal-次微分意义下也成立.若E=[a,b]R,则得到了不等式形式的中值定理.作为应用给出了函数凸性、Lipschitz性质及常数性质的Proximal-次微分刻划. 相似文献
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本文证明了在系统超势及其梯度(对Green应变)满足适当条件的混合边值约束下的有限弹性动力学系统的解是存在. 相似文献
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本文讨论了一类非线性非自治多值的退化抛物型方程解的存在性和解的正则性等。它代表一类具非线性本构约束及不可微外约束的能量耗散的物理、力学和优化等问题。 相似文献
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The electromechanical properties of metallic single-walled carbon nanotubes (SWCNTs) in the electric field are demonstrated with a column shell model in this paper.A hemisphere model is introduced to determine the charge distribution and the local electric field in SWCNTs.By treating the SWCNT as an elastic column shell,the analytical solutions of the charged SWCNT’s axial strain and the radial strain are obtained.SWCNTs with a larger aspect ratio show greater deformation.The greatest radial deformation appears at the end of the tube.The significant axial strain can be induced in CNTs with a large length (around 100 nm) even though the applied electric field is not strong enough.When SWCNTs are fixed at both ends,the radius of SWCNTs becomes small along the axial position. 相似文献