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In this paper, field experimental comparison is made between a small track-type experimental prototype skidder and a J-50 skidding tractor. Experimental data, including skidding productivity, soil compaction on skidding trails, and damage rate of the residual trees, are analyzed. The results indicate that with the condition of scattered skidding area and low skidding volume per cycle, small track-type experimental prototype skidder has advantage on working and a higher skidding productivity. It makes lower soil compaction to the skidding trails in the depth of 0-5 cm, 5-10 cm, and 10-15 cm. Under the same work conditions, the damage rate of the residual trees made by small track-type experimental prototype skidder is only 1/5 of those made by J-50 type skidding tractor. The damage rate is reduced by 80%. 相似文献
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成文术 《机电产品开发与创新》2022,35(3):139-141
本文在常规车用空气滤清器和自洁式空气滤清器测试过程中阻力变化数据基础上,基于面积法对两者的总能耗数据进行对比分析和研究,得出影响空气滤清器能耗的关键因素,提出了如何延长空气滤清器滤芯使用寿命及降低空气滤清器能耗的有效解决办法,并给出了具体实施方案。 相似文献
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Joydev Dinda Lakshmikanta Maity Chen-Shiang Lee Wen-Shu Hwang Salem S. Al-Deyab 《Journal of Inorganic and Organometallic Polymers and Materials》2016,26(5):1037-1042
Starting from tripodal ligand tris-(methyl-imidazole) amine (1) the colourless complex tris-(methyl-imidazole)aminesilver(I)perchlorate (2) has been synthesized, characterized by IR, UV/Vis and 1HNMR spectroscopic studies and finally solid state structure has been established by single crystal X-ray diffraction studies. A single crystal X-ray structure determination revealed the formation of coordination polymer. The crystal structure possesses weak d10–d10 ‘argentophilic’ interactions with Ag–Ag separation (3.348 Å). The weak luminance at 375 nm may be this Ag–Ag weak interaction. The molecule possesses weak H-bonding with C2 and C4H of imidazole with oxygen of ClO4. 相似文献
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Sen-Yeu Yang Shin-Chang Jiang Wen-Shu Lu 《Components and Packaging Technologies, IEEE Transactions on》2000,23(4):700-706
The effects of changing package shape to a ribbed geometry on thermal warpage and wire sweep of a plastic BGA (PBGA) are investigated in this paper. Three rib geometries (border, diagonal, and cross) with a variation of rib widths and thicknesses are compared with the original plane geometry. Finite element analyses of thermal warpage during the reflow process of PBGA molding with and without ribbed geometry are carried out. Numerical modeling shows that the border rib has the least thermal warpage at the reflow condition. Flow visualization was performed to study the effect of rib geometry on wire sweep, and demonstrates that the wire sweep in ribbed packages is significantly less than that in the original nonribbed package 相似文献
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移动IPv6网络家乡代理容错方法研究 总被引:2,自引:0,他引:2
移动IPv6基于家乡代理的转发,实现节点移动过程中的可寻址性.提出主动检测和迁移的家乡代理容错方法,通过在家乡代理之间设计环状检测和备份链,使家乡代理之间相互检测失效情况的发生;所有注册信息在家乡链路上仅备份一次;检测到失效后,有效家乡代理自动地暂时接管失效家乡代理的工作,并主动通告给相关移动节点;移动节点收到家乡代理失效信息后,主动启动恢复过程.给出了实现该方法的数据结构和容错算法,描述了具体的容错处理过程.通过理论分析证明了该方法比协议标准中的方法具有更小的容错时间和信令开销,特别是在移动节点的移动频率较慢的情况下更是如此. 相似文献
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在光伏玻璃加工生产中,常常伴随着气泡、结石等可能对生产过程造成破坏性故障的缺陷,如何可靠地检测出玻璃的缺陷显得至关重要.为了有效地从周期性纹理中分离出缺陷,引入了一种基于图像对比和图像签名的方法计算显著图.一方面利用中央-周边算子求取候选显著图,另一方面先后对原图进行离散余弦变换,图像签名方法,反离散余弦变换和高斯模糊等方法求得重构显著图,最后通过线性乘将两个显著图进行融合.实验结果显示,本算法对玻璃缺陷的提取效果明显优于其他7个显著性算法. 相似文献
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采用密度泛函理论构建了氧化银表面结构, 并分析了薄膜厚度对结构稳定性及光学性质的影响规律, 得出了氧化银 (100)、(110) 和 (111) 纳米薄膜的折射率、介电函数。研究表明, 纳米薄膜的折射率、介电函数在可见光波段均低于块体, 对 (100) 和 (110) 面来说, 随着薄膜厚度的增加, 其折射率、介电函数实部逐渐增加并接近于块体。而对于消光系数来讲, 这三个表面构成的纳米薄膜均低于块体, 尤其 (111) 面的吸收相对于另外两个面来说更小, 其中21层和24层相对更小。因此可以得出结论:由氧化银纳米薄膜构建的光存储和磁光存储纳米薄膜器件, 具有更高的透过率。 相似文献
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The mechanism outlined in literature for methane steam reforming over nickel catalysts is reviewed. Activation energy of this set of elementary steps for methane conversion into synthesis gas is obtained on the basis of bond order conservation Morse potential (BOC-MP), and the pre-exponential factors of the rate expressions of these elementary steps are then estimated according to the reported ranges in literature. A real-time Monte Carlo approach is developed to simulate the micro-kinetic trends for this catalytic process. 相似文献