电动汽车自兼容分析与实验

随着汽车电子技术的发展与用户对舒适度要求的不断提高,车内前装电子设备的数量大幅增加,其中不乏影响汽车安全的功能部件。本文基于整车设计图纸,对样车进行电磁兼容理论分析,获得存在自兼容风险的零部件为DC-DC、BMS、鼓风机、EPS、雨刮电机、喇叭;进一步的,基于自兼容实验,对理论分析结果论证筛选,提出DC-DC、雨刮电机、喇叭风险较大;最后通过与标准测试对标,验证了自兼容测试方法的有效性。

小卫星空间用频现状和问题研究

小卫星在轨依赖电磁波完成所需的各种无线电通信功能.近年来,随着在轨卫星数量的几何级数增加,卫星无线电通信频率资源日趋紧缺,空间用频问题逐渐暴露.为了给当前小卫星用频设计提供参考,对国内外空间用频现状进行了总结和梳理.在此基础上,从频率协调、频率兼容和用频安全等三方面分析了小卫星用频面临的难题和挑战.重点针对小卫星频率资源紧张且协调困难、空间用频限制造成自兼容设计困难及应急环境下频率使用安全等问题,提出了规范频谱协调管理、优化频率分配及提高抗干扰能力等建议和措施.最后给出了几点结论,并指出其对小卫星工程实际的借鉴和参考价值.

某型导弹发射车系统电磁兼容试验方法

介绍了某型导弹发射车电气系统的特点,依据GJB1389A—2005相关要求并结合工程实际,提出了系统电磁兼容试验项目,明确了系统电磁兼容试验的必要条件,详细叙述了具体的试验方法,该方法经过了试验验证,合理可行,可为同类项目的系统电磁兼容试验提供借鉴。

Comparative Study on Differences of America-China Eco-Literature Viewpoints From the Perspective of Academic Compatibility

Facing the broad ＂eco-literature＂ subjects, this paper, first of all, taking eco-literature viewpoint and the theoretical connotation of eco-criticism viewpoint itself as the starting point, conducts a contrast study from the cultural origin-tracing on the American eco-literature viewpoint under the Western Bible vision and the Chinese natural eco-literature viewpoint of＂Oneness of Men and Nature＂ through the parallel comparison method; then from the visual angle of influential research is to further explore the academic compatibility in academic research： namely, the Western ecological literature consciousness begins to appear under the premise of the Western ecological civilization being destroyed, while the China＇s natural eco-literature of＂Oneness of Man and Nature＂ is based on a kind of unconscious affinity between people and nature in primitive age. Here it is necessary for us to point out that they cannot be mentioned in the same breath, because the modern ecological criticism is not the reduction of an ancient ecological thought, and also will lead to the academic non-compatibility in academic research. So only by correcting the people＇s misunderstanding in cognition, can we reach the unity of the natural ecological viewpoint and man civilized viewpoint so as to keep the harmony between human beings and nature.

Lightweight,flexible and freestanding PVA/PEDOT:PSS/Ag NWs film for high-performance electromagnetic interference shielding

In order to fulfill the ever-growing requirements for electromagnetic interference(EMI)shielding materials,achieving a high efficiency with great flexibility is still a big challenge.Herein,high-performance EMI shielding composite films with excellent mechanical properties were fabricated via a convenient evaporation method using poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)and silver nanowires(Ag NWs)as conductive fillers.By adding 1.38 wt% Ag NWs into the original polyvinyl alcohol/PEDOT:PSS(PVA/PEDOT:PSS)composite,the obtained film with a thickness of about 20μm shows a remarkable EMI shielding performance(~33 dB)and a special EMI shielding efficiency of 16,800 dB cm^(-1) at 10 GHz.Furthermore,PVA/PEDOT:PSS/Ag NWs films present excellent tensile strength(~62.39 MPa)and elongation at break(~29.3%).The good mechanism allows the films to apply in actual harsh environments.Overall,this study will draw attention to the new films for electromagnetic shielding application.

Study on the compatibility of cement-superplasticizer system based on the amount of free solution

The changes of free solution amount, fluidity and the time-depended fluidity loss of cement paste were examined by varying the water-cement ratio and the dosages of superplasticizer. The distribution of solution and flocculation microstructure in flesh cement paste was observed with optical microscope. The change of free solution amount and its effect on the fluidity and bleeding of cement paste was studied. The results show that the adsorbed solution amount has a great influence on the com- patibility of cement-superplasticizer system, including the bleeding degree, the fluidity and the time-depended fluidity loss of cement paste. Superplasticizer increases the fluidity of cement paste by destroying the flocculated cement particle structure and increasing the amount of adsorbed solution. Polycarboxylate superplasticizer shows higher ability of adsorption than naphtha- lene superplasticizer. Over dosage of superplasticizer is not the primary cause of bleeding. The principle reason of bleeding is the high water-cement ratio and the insufficient enhancing ability of water adsorption of superplasticizer.

The Role of the Important Agricultural Heritage Systems in the Construction of China’s National Park System and the Optimisation of the Protected Area System

Conservation-compatible development of rural communities is an important part of nature conservation objectives.Understanding the role of agriculture,which is often practiced in or bordering the protected areas in rural China,is critical for managing conservation networks considering that limited spatial areas are available for enclosed protected areas.Important Agricultural Heritage Systems stand out for their multi-functionality,and some of their values are compatible with nature conservation.This paper examined the concept,management objectives and resource management characteristics of the Important Agricultural Heritage Systems(IAHS)by analysing their interactions with national parks in terms of community development.The results reveal that management strategies of dynamic conservation,integrated protection and adaptive management of the IAHS can contribute to those national park management objectives concerning conservation-compatible livelihood.However,the typology of the protected area system,including the traditional agricultural system as a new type,needs further consideration.