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1.
中红外大气辐射传输解析模型及遥感成像模拟   总被引:3,自引:0,他引:3  
为了建立完整的星载高分辨率中红外成像模拟系统,并为航天器载荷设计等相关工作提供有力参考,需要对大气辐射传输这一环节进行重点考虑,设计出切实可行,精度较高的大气辐射传输数值成像模拟方法.针对中红外大气辐射传输具有大气散射和自身发射的特性,将整个大气辐射传输过程进行了合理分解,并利用MODTRAN4对各辐射分量进行求解,以查找表方式实现了大气辐射传输成像模拟.此外,针对大气散射导致的邻近效应进行了分析,将原有PSF模型扩展至中红外波段,并与大气辐射传输解析模型相互耦合共同完成模拟成像.最后对模型进行了初步验证和成像模拟,结果表明:模型具有较好的模拟精度,通过给定观测几何和大气条件,并根据地表输入的温度和发射率等,实现逐像元的大气辐射传输计算.  相似文献
2.
竖直矩形窄缝内流动沸腾压降实验与模型研究   总被引:2,自引:0,他引:2  
本文实验研究了水在间隙为2.1、2.2、3.6 mm的垂直矩形窄通道内流动沸腾压降,包括入口过冷的情况,得到了在不同操作条件下压降随热流密度的变化曲线,同时分析了曲线变化的原因.实验结果发现:在实验参数范围内,流动沸腾的压降随着质量流速、热流密度和入口干度增加而增大;随着窄缝间隙的增大而减小.窄通道内的压降计算与大通道有显著不同,本文针对窄通道的特点,修正了传统的压降计算模型,模型预测值与实验结果比较,误差在±15.4%之内.  相似文献
3.
描述光伏效应的新解析模型   总被引:1,自引:1,他引:0       下载免费PDF全文
 对陆启生等人提出的描述光伏效应的解析模型涉及的边界条件进行了讨论,提出了一个适用性更宽的解析模型。通过对新模型、陆的模型以及另一个解析模型的比较,对前两个模型能够描述光伏型光电探测器在强光辐照时的信号饱和效应的原因进行了解释。  相似文献
4.
光学薄膜鲁棒设计中膜系误差灵敏度控制   总被引:1,自引:1,他引:0  
提出了一种基于膜系误差灵敏度控制的鲁棒膜系设计方法,建立了鲁棒膜系设计评价函数在膜层参数误差统计分布下的解析表达式,避免统计样本数目有限性造成的样本均值与总体期望的误差,以及过大数目样本造成的长的计算时间消耗,并通过宽带增透膜、中性分光膜和线性透射率滤光片等多种薄膜的鲁棒设计实验证实了其在膜层参数误差控制上的效果.结果表明:该新型鲁棒膜系设计方法具有内在的快速算法特性,其设计膜系对镀膜中的膜厚监控误差不敏感,对于高质量薄膜的重复制备和批量成品率的提高具有实用价值.  相似文献
5.
Laser forming of a metal plate involves a complex thermoplastic process. To accurately control the deformation of a metal plate, its temperature distribution must be obtained first. In this paper, three-dimensional finite element method simulations of the temperature field that account for the temperature dependence of the thermal properties of the materials were carried out. By defining a dimensionless temperature T* and a special Y-coordinate Y*, we found that temperature distributions in the Y′ direction are similar for different thicknesses. An analytical model of the temperature of the high-temperature zone in the Y′ direction is derived for the first time based on the similarity of temperature distributions and data obtained from regression analysis. The comparison of analytical and numerical results shows good agreement with respect to temperature distributions. This investigation is of significance for the prediction of a deformation field in future works.  相似文献
6.
This paper reports on an investigation into the development of an analytical model for the quality control of laser marking/engraving of clay tiles using a high-power diode laser (HPDL). An analytical model for the laser melting of inhomogeneous workpieces with parabolic melt pool geometry being assumed was developed. The theoretical results were compared with the experimental data. The predicted melt pool depth and the experimental values were in close correlation with the parameter for values less than 15 Wmm−1 s−1/2, in spite of simplifications introduced in the model. At the relatively large values of parameter the assumption of parabolic melt pool shape and one-dimensional heat transfer no longer holds true.  相似文献
7.
The development of an accurate analysis procedure for many laser applications, including the surface treatment of architectural materials, is extremely complicated due to the multitude of process parameters and materials characteristics involved. A one-dimensional analytical model based on Fourier's law, with quasi-stationary situations in an isotropic and inhomogeneous workpiece with a parabolic meltpool geometry being assumed, was successfully developed. This model, with the inclusion of an empirically determined correction factor, predicted high-power diode laser-induced melt depths in clay quarry tiles, ceramic tiles and ordinary Portland cement that were in close agreement with those obtained experimentally. It was observed, however, that as the incident laser line energy increased (>15 W mm−1 s−1/2), the calculated and the experimental melt depths began to diverge at an increasing rate. It is believed that this observed increasing discrepancy can be attributed to the fact the model developed neglects sideways conduction which, although it can be reasonably neglected at low-energy densities, becomes significant at higher energy densities since one-dimensional heat transfer no longer holds true.  相似文献
8.
To understand and engineer applications for mixed conducting oxides, it is desirable to have explicit, analytical expressions for the functional dependence of defect concentration and transport properties on the partial pressure of the external gas phase. To fulfill this need, general expressions are derived for the functional dependence of defect concentration on the oxygen partial pressure () for the mixed ionic electronic conductors. The model presented in this paper differs from expressions obtained using the popular Brouwer approach because they are continuous across multiple Brouwer regions.
Eric D. WachsmanEmail:
  相似文献
9.
王平  杨银堂  杨燕 《计算物理》2006,23(1):80-86
基于对自身能带结构的分析以及各向同性弛豫时间近似法,采用三椭球等能面、抛物线性简化,建立了适于模拟n型6H-SiC电子霍耳迁移率和霍耳散射因子的解析模型,精确描述了不同散射机制对于6H—SiC低场电子输运特性的影响.计算结果与实测值有很好的一致性.  相似文献
10.
To obtain further insight into the deformation of a plate in the laser forming process, the temperature gradient mechanism (TGM) is studied. Through the investigation, it can be found that, under the processing conditions of TGM, the plate not only bends about the x-axis but also about the y-axis. An analytical model estimate of the bending angle about the y-axis is constructed based on the theories of heat transfer and the mechanics of elastoplasticity. Numerical simulations are carried out to investigate the deformation of the plate about the y-axis by choosing the different process parameters. The analytically based estimate is used to suggest suitable starting values for the simulation process of calculated results. The study of the bending about the y-axis may describe more fully the deformation of a plate, which is helpful in high-precision forming.  相似文献
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