共查询到20条相似文献，搜索用时 15 毫秒
1.
A new type microgap surge absorber fabricated by only semiconductor technique has in it a special structure silicon chip which
forms microgaps for gas discharge with electrodes, and has advantages such as small size, low cost, suitability for mass production
besides the desirable characteristics that common microgap surge absorbers have. Applications of this absorber in communication
facilities are discussed. 相似文献
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该文介绍一种新型机动车前轮悬架,它由主、副减振器以及减振弹簧组成,其中减振弹簧由三个螺旋弹簧并联组成,在承受不同载荷时,减振弹簧刚度值随之变化。在主减振器与副减振器间存在较小夹角,并随载荷不同而发生变化,有利于改善了阻尼系数。这种结构提高驾驶时的舒适性,特别适合在单前轮机动车上使用。 相似文献
3.
《天津大学学报(英文版)》2017,(5)
In this paper, we investigate a multi-objective optimal design of a tuned vibration absorber for a two degrees-of-freedom linear system, in which we take white Gaussian noise as the excitation. We use the simple cell mapping method to obtain solutions to the multi-objective optimization problem. We optimize tuned vibration absorbers in two different configurations. As our objective,we take various features of the response of the power spectrum density function. Our results show that the primary mass vibration with the optimally designed absorber has a lower peak power spectrum value. In addition, the two natural frequencies of the optimized system are further apart than in the non-optimized system, which implies that the absorber has a wider effective region in the frequency domain. 相似文献
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宽带波导吸振器吸振性能研究 总被引：1，自引：0，他引：1
为了满足对声频振动控制的要求,拓宽动力吸振器的吸振频率范围,本文在对直梁宽频带动力吸振器研究的基础上,研究了螺旋曲梁式动力吸振器.研究表明,该吸振器具有更密集的模态,因而具有宽频带的吸振性能.它的变截面形式使得它具有更强的消耗振动能量的能力,数值分析还表明如果设计合理,在0～1000Hz的频率范围内都可以获得较大的吸振量,有望成为噪声与振动控制新的有效手段. 相似文献
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郑玲 《重庆大学学报(英文版)》2003,2(2)
1. Introduction As is known, the function of a suspension system is to support an entire vehicle at axles so as to improve ride comfort by vibration absorption. It also provides handling stability in steering and acceleration as well as braking. However, the solution of the design contradiction between ride comfort and handling stability can抰 be achieved by passive suspension system elements. Some active suspension systems have been developed in order to handle the compromise, but they requi… 相似文献
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A two-dimensional numerical model of extratropical storm surge and inundation in Bohai Bay was built based on the unsteady flow Navier-Stokes equations. The model included two sections, one was for the simulation of storm surge tidal level and the other for the simulation of storm surge inundation in the coastal area. While simulating the storm surge tidal level, the alternating direction implicit (ADI) method was applied to dispersing and solving 2D storm surge equations. In the simulation of storm surge inundation, the 2D unsteady flow equations were dispersed and solved using the structureless grids of finite volume method (FVM). A coupling calculation mode of the process of inundation and storm surge tidal level variation was proposed, therefore the storm surge inundation process and area could be calculated while simulating and forecasting the process of storm surge tidal setup. Furthermore, an extratropical storm surge and inundation in Bohai Bay were simulated using this numerical model. Simulation results are in good agreement with the measured data, which shows that this numerical model provides a new method of simulating and forecasting storm surge and inundation in Bohai Bay. 相似文献
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本文首先分析了电力系统中浪涌的成因：雷电浪涌及开关浪涌。然后通过对低压电网中瞬态过电压因素分析,提出在不同电力系统中,实现浪涌保护的有效途径。 相似文献
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汪贤才 《安徽科技学院学报》2005,19(2):22-24
在曲线拟合实践中,提高拟合多项式的阶数,往往使多项式曲线在某些区间产生振荡,这就是多项式的摆动.本文介绍了非线性实验数据拟合高阶多项式摆动的概念,从实践的角度分析了产生这些摆动及偏差的因素和特点,总结了在实践中减小这些偏差的处理方法. 相似文献
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邓戊有 《衡阳师范学院学报》1994,(6)
利用废气自身所含成份一氧化氮具有催化氧化反应的作用，使其中的另一成份二氧化硫被氧化。选择一种对一氧化氮非常有效的吸收剂，吸收分离、循环使用，这样同时除去废气中的氮氧化物和二氧化硫。再用常用的方法除去二氧化碳和一氧化碳，从而达到无害排放的目的。同时回收数种化工产品。 相似文献
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李建春 《遵义师范学院学报》2007,9(5):84-87
《兰亭序》是"书圣"王羲之的"天下第一行书"。它影响了一代代书家,使中国书法艺术的发展出现了一次次高潮。美术系本科书法课程中的行书教学中,也应选《兰亭序》为范本。认真研究兰亭序的教学方法对提高该课程的教学效果有其重要意义。 相似文献
11.
Wei-feng SHEN Li-bing JIANG Guan-yu JIANG Mao ZHANG Yue-feng MA Xiao-jun HE 《Journal of Zhejiang University. Science. B》2014,15(12):1072-1080
研究目的：系统回顾大规模伤亡事件（MCI）经典研究范式,结合2008年汶川地震和2014年杭州7-5公交车起火事件,优化MCI应对的研究范式。创新要点：研究方法：重要结论：需求激增理论是MCI应对实时评估的显著进步,结合2008年汶川地震和2014年杭州7．5公交车起火事件,我们发现MCI应对评估中一个非常重要的脆弱性因素被忽略。采用关键词和医学主题词（大规模伤亡事件、MCI、研究方法、汶川、地震、研究范式、激增科学、激增、激增应对能力和脆弱性等）,通过检索数据库PubMed、EMBASE、中国万方及中国生物医学（CBM）的相关研究资料库,进行理论的回顾性分析和结合实际案例的分析。除需求激增理论中的激增和激增应对能力这二个基本维度外,应引入第三个维度脆弱性,形成更为全面和客观的三个互为关联维度构建MCI的新研究范式,突破MCI传统研究范式的局限性。 相似文献
12.
Comprehensive risk analysis of storm surge flood based on WebGIS 总被引：1，自引：1，他引：0
The comprehensive risk analysis of storm surge flood is vital to the safety management of sea embank- ment, the scientific assessment of storm surge disaster and the improvement of emergent treatment in storm surge haz- ard. Based on the research of disaster-causing, disaster-pregnant and disaster-bearing factors, the influencing factors of storm surge risk are concluded to be flood natural risk, embankment position, embankment width and height. The membership degree of the factors of storm surge risk is firstly determined by storm surge flood evolution based on WebGIS, and the comprehensive risk membership and risk grade of each influencing factor are obtained. Then the effects of a single factor on comprehensive risk and sensitivity analysis are discussed, and the storm surge flood risk map is obtained. Finally, the storm surge of Tianjin Binhai New Area is taken as a case. The results show that the in- fluencing degree of the factors on the comprehensive risk membership is in decreasing order of flood natural risk, em- bankment position, embankment width and height. The flood risk map of the case is drawn, which is useful to decrease losses caused by storm surge disaster. 相似文献
13.
王孝 《江西电力职业技术学院学报》2011,24(3):31-32,68
通过分析吸收塔运行中溢流过程,指出吸收塔运行过程中可能发生溢流的危险工况,并给出了预防措施和建议,以防止吸收塔溢流现象发生. 相似文献
14.
Educational Psychology Review - There has been a surge in interest and implementation of immersive virtual reality (IVR)-based lessons in education and training recently, which has resulted in many... 相似文献
15.
The occurrence of storm surge disaster is often accompanied with floodplain, overflow, dike breach and other complex phenomena, while current studies on storm surge flooding are more concentrated on the 1D/2D numerical simulation of single disaster scenario(floodplain, overflow or dike breach), ignoring the composite effects of various phenomena. Therefore, considering the uncertainty in the disaster process of storm surge, scenario analysis was firstly proposed to identify the composite disaster scenario including multiple phenomena by analyzing key driving forces, building scenario matrix and deducing situation logic. Secondly, by combining the advantages of k-ω and k-ε models in the wall treatment, a shear stress transmission k-ω model coupled with VOF was proposed to simulate the 3D flood routing for storm surge disaster. Thirdly, risk degree was introduced to make the risk analysis of storm surge disaster. Finally, based on the scenario analysis, four scenarios with different storm surge intensity(100-year and 200-year frequency) were identified in Tianjin Binhai New Area. Then, 3D numerical simulation and risk map were made for the case. 相似文献
16.
梁丽萍 《衡阳师范学院学报》2009,30(3):58-60
针对运行于准四能级的掺Yb光纤激光器,研究了未泵浦光纤吸收区掺Yb光纤温度对可饱和吸收效应,以及对F-P腔先纤激光嚣运行激光的影响.可饱和吸收效应随温度升高而增强. 相似文献
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It is imperative to develop a risk assessment system for quickly predicting storm surge disaster due to the vulnerability of Tianjin Binhai New Area. The flood routing model with user-defined breaches was firstly established based on the seed spread algorithm in order to achieve a rapid forecasting of storm surge flood information. Furthermore, fuzzy mathematics was utilized to identify the storm disaster grade, and the hazard mapping was conducted to visually obtain the hazard spatial and temporal distribution. Finally, the flood routing visualization method was proposed based on numerical simulation of storm surge to achieve the reappearance scene of dynamic evolution process. The developed system can play a vital role in the management and decision-making of sea dyke mitigation engineering in Tianjin Binhai New Area. 相似文献