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991.
梳针刺辊与锯齿刺辊分梳差异的研究 总被引:4,自引:4,他引:0
为研究刺辊类型、速度对纤维损伤和去除结杂的影响,用Uster AFIS单纤维测试系统,分别对三种梳针刺辊和一种锯齿刺辊在二档道夫速度和四档刺辊速度条件下所加工的生条进行了检测.结果显示:梳针刺辊在减少纤维损伤方面明显优于锯齿刺辊;梳棉机产量低时,梳针剌辊去除棉结的效果好一些,梳棉机产量高时,锯齿刺辊去除棉结的效果要好于梳针剌辊;梳棉机产量低时,大都以锯齿和梳针Ⅲ刺辊去除杂质效果好些,梳棉机产量高时,锯齿和梳针Ⅱ刺辊去除杂质效果好些. 相似文献
992.
High dielectric constant (high-k) polymer composites are of great interest for embedded capacitor applications. Previously,
we demonstrated that epoxy—aluminum composites are promising for embedded capacitor applications, because they have a high
dielectric constant and a low dielectric loss due to the core—shell structure of the self-passivated aluminum particles. In
this work, to further understand the dielectric behavior of aluminum composites, lower-loss polymers such as silicone, polyimide,
polynorbornene, and benzocyclobutene were explored as matrices for the aluminum composites. It is found that the polymer matrices
can significantly change the dielectric properties of the aluminum composites. A polymer matrix with a lower dielectric constant
generally results in a lower dielectric constant of its aluminum composites. In this regard, polymer—aluminum composites have
a similar dielectric characteristic as polymer—ceramic composites. Thermomechanical properties of aluminum composites were
characterized by a thermomechanical analyzer. 相似文献
993.
994.
995.
996.
给出了一种用于Y7—200A运输机的隐蔽式短波天线,该天线为位于飞机垂尾前缘的回线天线,与飞机的外形共形,不影响飞机的飞行性能。在利用传输线理论与缝隙天线理论对该天线进行分析的基础上,对输入阻抗、天线与天线调谐器结合后的天线效率进行了研究,给出了该天线与KHF950电台相配合的测试试验结果,该天线能够在2.5MHz到30MHZ范围内与KHF950电台良好调谐,表明这种天线完全可以用于Y7—200A型飞机,代替原有的钢索天线。这是在国产飞机上首次使用这种天线。 相似文献
997.
间苯二酚溶剂萃取液液相平衡研究 总被引:4,自引:0,他引:4
测定了“醋酸正丁酯-间苯二酚(溶质)-盐水(含0.2质量分率NaCl)”三元系在24℃、101.33kPa下的液液相平衡数据并给出了三角相图,用Hand公式对相平衡数据进行了关联,获得了可供工业连续萃取过程设计使用的关联式。本研究将醋酸正丁酯和正丁醇作为溶剂萃取间苯二酚进行了对比,并指出:醋酸正丁酯优于正丁醇。 相似文献
998.
999.
L. Pamela Cook Emeka Nwankwo Gilberto Schleiniger Bryan Wood 《Journal of Engineering Mathematics》2003,45(3-4):269-282
A general formulation for capillary flow of two miscible fluids – one a dilute plug of polymer fluid inserted into a fully developed Poiseuille flow of the other, a Newtonian stream – is examined for its long time behavior. Phenomenologically, the system evolves from an initial state, that of a plug within the boundaries of sharp, well defined fronts inside a Newtonian stream, to a more homogenized state in the very long time scale. This problem was addressed by G.I. Taylor but with regard to a system of two Newtonian fluids, leading to the well-known results commonly described as `Taylor axial dispersion'. In this paper, a general and systematic perturbation analysis is presented from which Taylor's result is recovered as a special case of a more general solution which applies to fluids incorporating elastic properties. In particular, the influence of viscoelasticity and (polymer) diffusivity on the observed pressure profile in the capillary conduit is examined. This effect is clearly separated out for small Peclet number flows using asymptotic and numerical analysis. The results identify the influence of fluid viscosity, elasticity, and diffusivity on the observed pressure profile and form the basis for the improved characterization of polymeric elasticity using capillaries – a finding that is of significant scientific and commercial interest. These results were obtained by the authors as a class of observations resulting from the perturbation analysis of forced-flow capillary devices in viscoelastic fluid property investigation. 相似文献
1000.
In this paper we propose a new protocol called time-space label switching protocol (TSL-SP) in optical burst switching (OBS), and define the terms time-space label (TSL) and time-space routing (TSR). An important concept of response time is introduced in the time label mechanism. The TSL-SP is a new technology that can quickly and efficiently forward data with a label on the optical networks. A two-dimension label switched path (TD-LSP) can be set up, that is maintained and deleted by the TSL-SP. For clearly illuminating the operation principles of the TSL-SP, we propose a new approach of orthogonal time-space coordinates in which the vertical coordinate is the space label and the horizontal coordinate is the time label. The proposed TD-LSP can dramatically reduce the routing failure probability and greatly improve the link network efficiency compared with other signaling protocols. Moreover, we define the time-space label control plane that can achieve the higher efficiency. When the TSL-SP is applied to networks, switching performance can be improved by two orders compared to the switching performance with the conventional OBS signaling protocols. The fundamental goal of TSL-SP is to band the signaling and routing functions together closely. Also, the TSL-SP can reduce the complexity of the network, support automatic service offering, and provide traffic engineering. 相似文献