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介绍了合成高强度(225~258N)金刚石单晶对炭源材料、触媒合金、试块组装方式及合成参数的要求,讨论了原料、合成工艺与合成条件对合成高强度的优质金刚石的影响及合成机理。 相似文献
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文章通过对弹性支撑块套鞋组装生产线的工序组织、组装生产线装卸机械手、旋转输送辊道装置、2轴弹性支承块数控喷胶装置等设备的研究,实现弹性支承块套靴流水线组装生产,实现工序自动化生产,解决弹性支承块套靴组装效率低、质量不稳定、投入成本高的技术难题。 相似文献
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探讨同时使用压力棒上销和压力棒隔距块的作用机理及应用体会。介绍了压力棒上销和压力棒隔距块的主要作用,试验并对比了单独压力棒上销、压力棒隔距块条件下的细纱质量情况和同时使用两者条件的质量情况。试验表明,单独使用压力棒上销和压力棒隔距块对细纱质量有一定的提高,同时使用并没有表现出两者对细纱质量提高百分率的相加,但比单独使用都要来的好。同时使用压力棒上销和隔距块能较大幅度提高细纱质量。 相似文献
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应用压力棒隔距块纺纱出硬头问题的研究 总被引:2,自引:0,他引:2
针对细纱机使用带压力棒隔距块纺纱过程中出硬头问题,设置了三种工艺配置对带压力棒隔距块和普通隔距块进行了试验:①其它纺纱条件不变,选用的隔距块比普通隔距块放大一档;②隔距块放大一档并适当减小粗纱捻度;③隔距块放大一档、适当减小粗纱捻度后,再适当提高细纱摇架压力.试验表明第三种工艺配置的带压力棒隔距块能显著改善成纱条干,通过合理调整工艺,可有效解决出硬头问题. 相似文献
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利用经典的半正定Hermite矩阵的等价条件,讨论了2×2分块矩阵的保半正定性问题.A为2×2半正定Hermite分块矩阵时,则对每一子块分别取迹、行列式、谱范数、秩、数值域后所成矩阵仍为半正定;当A为2×2分块矩阵时,(A)的范数和数值域半径分别不超过(A)的范数和数值域半径. 相似文献
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Composite complete-incomplete (C-I) block designs are formed by combining complete blocks of size t units with balanced incomplete blocks of k units (1 ≤ k < t) resulting in blocks of size t+k units. In sensory experiments, composite C-I block designs have been shown to be more efficient than the standard complete block designs. Replication of the blocks in these C-I block designs permits accurate interpretation of panelist X treatment interaction effects. Also, the formulae for calculating estimates of the treatments, panelists, and interaction effects are simpler in form with the replicated C-I designs than the corresponding formulae with the unreplicated C-I block designs. The analysis of an experiment involving the rating of flavor of three strawberry preserves using a replicated C-I block design is presented. 相似文献
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研究了分块周期三对角矩阵的逆问题.利用递归方法,将高阶分块周期三对角矩阵的求逆转化为低阶分块周期三对角矩阵的求逆,给出了求分块周期三对角矩阵的逆矩阵的一种新算法.通过算法的计算量的比较,新算法比直接求逆算法的计算量小.新算法的算法复杂度为4n2+0(n)次,而直接求逆的算法复杂度是5.5n2+0(n)次.算例表明新算法... 相似文献
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基于ABAQUS软件的多轴器动力座模态分析 总被引:1,自引:0,他引:1
多轴器动力座的振动对多轴器的加工精度有很大影响,通过对多轴器动力座模态分析,为多轴器动力座设计与优化提供了设计依据,对多轴器的加工精度的提高有了很大的帮助。文章用三维建模软件SolidWorks建立的多轴器动力座模型导入到有限元分析软件ABAQUS中进行模态分析,用Block。aanczos法提取模态。给出了前4阶固有频率及振型。分析得到多轴器动力座由于振动导致了支架板的变形,提出通过给支架板加加强筋的方法,可以大大提高多轴器动力座的刚度及多轴器的加工精度。图6表1参10 相似文献
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A. P. IMESON J. R. MITCHELL D. A. LEDWARD 《International Journal of Food Science & Technology》1980,15(3):319-327
The tensile and shear strengths of fibres produced by extruding dopes of 2.0% sodium alginate and 6.0% blood plasma into a coagulating bath of calcium chloride (5% w/v) at pH 4.0, varied according to the guluronic acid block content and molecular weight (viscosity) of the alginates. The shear resistance of the fibres was not dependent on guluronic acid block content or alginate viscosity. However, when calculated per gram of dry matter, fibres containing alginates of high guluronic acid block contents had significantly greater resistance to shear than fibres spun from alginates of low guluronic acid block content although there was still no significant dependence on alginate viscosity or degree of polymerization.
The tensile strength of fibres produced from high guluronic acid block alginates was not related to the viscosity of the sample. However, in fibres containing low guluronic acid block contents the strength increased as the degree of polymerization increased. These relationships were equally valid whether calculated on a wet or dry basis. In addition there was an inverse correlation between percentage elongation at maximum tensile stress and the viscosity of the spinning dopes.
Possible explanations for these observations are discussed. 相似文献
The tensile strength of fibres produced from high guluronic acid block alginates was not related to the viscosity of the sample. However, in fibres containing low guluronic acid block contents the strength increased as the degree of polymerization increased. These relationships were equally valid whether calculated on a wet or dry basis. In addition there was an inverse correlation between percentage elongation at maximum tensile stress and the viscosity of the spinning dopes.
Possible explanations for these observations are discussed. 相似文献