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11.
A residual offset lower than 0.2 mT is obtained with a CMOS integrated vertical Hall (VH)-sensor microsystem. Instead of the conventional design with five contacts in the sensor active area, we apply a layout with only four contacts. This design shows a higher effectiveness for the offset reduction by the spinning current (SC) method, because of the symmetrical current flow for the two different biasing phases. Furthermore, to obtain very low offsets, coupled sensors are integrated with the spinning current electronics in the final microsystem. A sensitivity up to Sv=0.025 V/VT is achieved for these sensors without any additional technology step. The measured output noise level of the integrated microsystem (1.9 μT/
) is in the usual range of commercial integrated Hall-sensors. Our new developments open the way to the realization of compact, low-cost angular sensors with 10 bit resolution. 相似文献
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介绍了通过合理配棉以降低精梳纱生产成本的生产实践,优化各项工艺参数,使之高效合理,同时,采用中胶辊纺纯棉精梳纱,产品质量稳定在2001乌斯特公报25%水平以内。 相似文献
14.
The paper presents the research results on electrostatic charging tendency (ECT) of transformer oil in a spinning disk system. The measurements were performed at different aging severity. Changes in static electrification were related to some classical aging indexes (conductivity, dissipation factor, water content, resistivity, etc.). Fast, inexpensive and reliable laboratory testing procedures developed by ASTM (D 6802 and D 6181) were also used to monitor the decay products as trace impurities. The obtained results show that static electrification currents increase with temperature, oil flow velocity, coating disk material properties and oil’s aging byproducts. The polarity, the amplitude and the time constant of the streaming electrification currents are also affected. This contribution is not only intended to provide a fresh review in this domain of research, but also contains a substantial amount of new material with a view of closing some gaps in the present state of knowledge of transformer oil streaming electrification phenomenon. 相似文献
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This review addresses the recent developments of the processing of cellulose nanocomposites, focusing on the most used techniques, including solution casting, melt-processing of thermoplastic cellulose nanocomposites and resin impregnation of cellulose nanopapers using thermoset resins. Important techniques, such as partially dissolved cellulose nanocomposites, nanocomposite foams reinforced with nanocellulose, as well as long continuous fibers or filaments, are also addressed. It is shown how the research on cellulose nanocomposites has rapidly increased during the last 10 years, and manufacturing techniques have been developed from simple casting to these more sophisticated methods. To produce cellulose nanocomposites for commercial use, the processing of these materials must be developed from laboratory to industrially viable methods. 相似文献
16.
在灯具罩生产行业至今没有由专用数控系统组成的旋压机床,大部分由通用数控机床改造而成,故数控系统功能浪费、数控旋压机床成本高。因此,采用工控机、伺服驱动器和变频器等硬件设备,设计了灯具罩数控旋压机床的电气控制系统,并根据灯具罩的几何形状和旋压加工工艺,开发了灯具罩旋压轨迹控制模型,在此基础上研制了灯具罩数控旋压机床的专用数控系统。该系统只要将模具参数、加工轨迹外轮廓参数和灯具罩加工参数输入专用数控系统,就可以按照设定算法自动生成加工轨迹图,滚刀按照轨迹图自动进行旋压加工,从而实现加工过程的全自动控制。 相似文献
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Influence of the Disk Diameter and Baffle Position on the Performance of Generated Colloidal Gas Aphrons
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Sina S. Banifatemi Hossein Mohammadifard Mohammad C. Amiri 《Journal of surfactants and detergents》2016,19(1):173-181
Aphrons are surfactant‐stabilized microbubbles with thick soapy shells. Colloidal gas aphrons (CGA) with an average diameter of 50 μm have some unique properties: a high interfacial area due to their small size, a thick soapy shell and, above all, high stability compared to conventional foams. Various factors that can influence the performance of CGA dispersion, such as the type and concentration of surfactant, mixing time and processing parameters, have already been extensively studied. However, although CGA applications in various fields continue to advance, the influence of the disk diameter and baffle position of the aphron generator on the performance of CGAs has not been well studied. In this experimental work, the influences of the spinning disk diameter and baffle position inside the aphron generator have been investigated. Analyzing the drainage curve of various experimental runs revealed that the disk diameter and baffle position might have a positive impact on the stability of CGA dispersion particularly when the generation time or surfactant concentration is low. The experimental findings have been supported by other techniques such as half‐life time and a new stability index, T0.1, the time elapsed when the drained liquid from CGA dispersion reaches ten percent of its final height. 相似文献
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Seiko Jose Robin Das Izhar Mustafa Sujoy Karmakar Gautam Basu 《Journal of Natural Fibers》2019,16(4):536-544
The use of textile-grade fiber extracted from the Indian pineapple leaf is an unexplored area. Pineapple leaf fiber (PALF) is fine, soft, and moderately strong and is much acceptable for fashion garment. An attempt has been made to extract and soften Indian PALF from the pineapple leaves by decortication and subsequent water retting. Decorticated cum retted fiber has shown better physicomechanical and surface appearance properties than decorticated fiber. Fine yarn (38 tex) was spun in a suitable spinning system, and the property performance was found to be suitable to make eco-sustainable novelty fabric. Fabric was developed by using cotton as warp yarn and PALF-based yarn as weft in a handloom. The developed fabric shows very good physical and mechanical properties, desired for apparels. This inferred that Indian PALF may be successfully used to make eco-niche apparel quality fabric as well as novelty textiles. 相似文献
20.
纺织厂组合式空调机组智能模糊控制系统的开发 总被引:1,自引:2,他引:1
以化纤厂纺丝车间侧吹风为例,介绍了应用90年代工控技术开发研制的纺织厂及化纤厂空调系统用组合式空调机且的智能模糊控制系统。 相似文献