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在新的社会条件下,镀镍碳纤维EMI/RFI屏蔽材料东山再起
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作者 黄汉生 《高科技纤维与应用》 CAS 1997年第Z5期19-19,共1页
镀镍碳纤维80年代曾由美国氰氨公司作为办公机械电磁干扰/射频干扰(EMI/RFI)屏蔽用导电性填料在市场上销售。但过去因价格偏高其应用仅限于军事方面的用途。1983年这一技术的发明者将技术卖给了氰氨公司(现为Cytec业公司)。现在发明者... 镀镍碳纤维80年代曾由美国氰氨公司作为办公机械电磁干扰/射频干扰(EMI/RFI)屏蔽用导电性填料在市场上销售。但过去因价格偏高其应用仅限于军事方面的用途。1983年这一技术的发明者将技术卖给了氰氨公司(现为Cytec业公司)。现在发明者之子小路易斯·G·莫林从Cytec工业公司又买回了这一技术,并创办了复合材料公司,专门生产和销售这种纤维,供用于替代目前EMI/RFI屏蔽中占主导地位的喷涂和涂装技术。 展开更多
关键词 屏蔽材料 社会条件 碳纤维 镀镍 维E 导电性填料 办公机械 射频干扰 美国氰氨公司 屏蔽效力
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Binding Energies of Screened Excitons in a Strained(111)-Oriented Zinc-Blende GaN/AlGaN Quantum Well Under Hydrostatic Pressure 被引量:6
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作者 哈斯花 班士良 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2008年第2期234-239,共6页
We investigate the binding energies of excitons in a strained (111)-oriented zinc-blende GaN/Al0.3 Ga0.7 N quantum well screened by the electron-hole (e-h) gas under hydrostatic pressure by combining a variational... We investigate the binding energies of excitons in a strained (111)-oriented zinc-blende GaN/Al0.3 Ga0.7 N quantum well screened by the electron-hole (e-h) gas under hydrostatic pressure by combining a variational method and a selfconsistent procedure. A built-in electric field produced by the strain-induced piezoelectric polarization is considered in our calculations. The result indicates that the binding energies of excitons increase nearly linearly with pressure,even though the modification of strain with hydrostatic pressure is considered, and the influence of pressure is more apparent under higher e-h densities. It is also found that as the density of an e-h gas increases,the binding energies first increase slowly to a maximum and then decrease rapidly when the e-h density is larger than about 1 ×10^11 cm^-2. The excitonic binding energies increase obviously as the barrier thickness decreases due to the decrease of the built-in electric field. 展开更多
关键词 EXCITON strained zinc-blende quantum well pressure screened effect
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Force measurement between mica surfaces in electrolyte solutions 被引量:4
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作者 赵古田 郭纬川 +4 位作者 谭启檐 裘英华 阚亚鲸 陈云飞 倪中华 《Journal of Southeast University(English Edition)》 EI CAS 2013年第1期57-61,共5页
The forces between two molecularly smooth mica surfaces are measured in monovalent and divalent cations electrolyte solutions by a surface force apparatus (SFA). The properties of K+, Na+, and Mg2+ between molecu... The forces between two molecularly smooth mica surfaces are measured in monovalent and divalent cations electrolyte solutions by a surface force apparatus (SFA). The properties of K+, Na+, and Mg2+ between molecularly smooth mica surfaces are investigated. The Derjagui-Landau- Verwey-Overbeek (DLVO) force and the hydration force are detected in the experiment. The results show that in lower concentrations of a monovalent electrolyte solution (about 10-4 mol/L), the force curves are completely in good agreement with those computed by the DLVO theory. However, additional short-range repulsive forces which deviate from the DLVO theory are observed when the concentrations of cations are above the critical bulk concentration, which is different for each electrolyte. The results show the properties of these cations on both the screening effect adsorbed on the mica surface and the hydration in solution. From the results, the interaction energy between two hydrated ions of potassium or sodium can also be estimated. 展开更多
关键词 surface force apparatus (SFA) DLVO force hydration force screening effect
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EMI的最佳解决之道希普列上海办事处
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《印制电路信息》 1998年第12期22-22,共1页
一般来说,任何会产生电流的线路或设备都是潜在的EMI源。EMI指在通信或遥控中使用的可控电磁信号中的不可控的干扰。由于个人电脑、电视游戏和大量微处理器的增加,它们的频带噪声也相应大幅度增加。这样一来,就使EMI问题更严重了。
关键词 解决之道 化学镀铜 办事处 频带噪声 通信和电子设备 化学镀镍 电视游戏 电磁信号 热循环测试 屏蔽效力
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Gravitational Shielding Effect in Gauge Theory of Gravity 被引量:1
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作者 WUNing 《Communications in Theoretical Physics》 SCIE CAS CSCD 2004年第4期567-572,共6页
In 1992,E.E.Podkletnov and R.Nieminen found that under certain conditions,ceramic superconductor with composite structure reveals weak shielding properties against gravitational force.In classical Newton's theory ... In 1992,E.E.Podkletnov and R.Nieminen found that under certain conditions,ceramic superconductor with composite structure reveals weak shielding properties against gravitational force.In classical Newton's theory of gravity and even in Einstein's general theory of gravity,there are no grounds of gravitational shielding effects.But in quantum gauge theory of gravity,the gravitational shielding effects can be explained in a simple and natural way.In quantum gauge theory of gravity,gravitational gauge interactions of complex scalar field can be formulated based on gauge principle.After spontaneous symmetry breaking,if the vacuum of the complex scalar field is not stable and uniform,there will be a mass term of gravitational gauge field.When gravitational gauge field propagates in this unstable vacuum of the complex scalar field,it will decays exponentially,which is the nature of gravitational shielding effects.The mechanism of gravitational shielding effects is studied in this paper,and some main properties of gravitational shielding effects are discussed. 展开更多
关键词 gravitational shielding effect symmetry breaking quantum gravity gauge field
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