A serial of＂comb-like and trough-like＂folds developed in eastern Sichuan,controlled by the multi-layer detachment folding,is different from the classical Jura-type structure in their development.The key factor resul...A serial of＂comb-like and trough-like＂folds developed in eastern Sichuan,controlled by the multi-layer detachment folding,is different from the classical Jura-type structure in their development.The key factor resulting in the development of these structures is the occurrence of detachment layers in different parts of Neoprotozoic to Mesozoic stratigraphy of study area,which, from the bottom to the top,are the lower part of Banxi Group,Lower Cambrian（Niutitang Formation）,Lower Silurian（Longmaxi Formation and Luoreping Formation）,Upper Permian （Wujiaping Formation） and Lower Triassic（Daye Formation）.On the basis of field survey combined with sand-box modeling,this study argued that the detachment layer of the lower part of Banxi Group controlled the development of the＂comb-like＂folds,and the lower part of Cambrian detachment layer controlled the development of＂trough-like＂folds.Because of several detachment layers occurring in the study area,the development of duplex structures different scales is an important deformation mechanism,and the duplexes are the important structures distinguished from the typical detachment folding structures.Due to these duplexes,the surface structures and structural highs may not be the structural highs in the depth.Meanwhile,the detachment layers are good channels for oil/ gas migration benefiting the understanding of accumulation and migration of oil and gas.展开更多
The theoretical model and non-homogeneous differential equation of equal thickness multi-layer folds sandwiched in different thickness and same character media are established by elastic and plastic mechanics. The spe...The theoretical model and non-homogeneous differential equation of equal thickness multi-layer folds sandwiched in different thickness and same character media are established by elastic and plastic mechanics. The special answer of the non-homogeneous differential equation and the common answer of the homogeneous differential equation are deduced by applying logistic equation and special function, and the dominant wavelength theory of equal thickness multi-layer folds sandwiched in different thickness and same character media. In addition, the experimental folding in both elastic and sticky materials proves the dominant wavelength theory.展开更多
A novel multi-beam folded waveguide(MBFW) circuit,which can enhance the output power and interaction efficiency of sub-terahertz(THz) traveling wave tube(TWT),is presented in the paper. Operating with fundamental mode...A novel multi-beam folded waveguide(MBFW) circuit,which can enhance the output power and interaction efficiency of sub-terahertz(THz) traveling wave tube(TWT),is presented in the paper. Operating with fundamental mode and multiple electron beams means that a larger beam current can be used for a higher output power. The characteristics of the MBFW structure are analyzed and optimized. Compared with the single-beam folded waveguide(SBFW) TWT,the output power of the MBFW TWT increases from 3.64 W to 25.45 W at 140 GHz and its electronic efficiency increases from 1.06% to 7.4% under the conditions of an input peak power of 10 m W,a beam voltage of 9.55 k V and a current of 12 m A. The optimized MBFW structure can be successfully fabricated by micro milling,with dimension errors below expectation,and the measured transmission characteristics are in good agreement with the design.展开更多
This paper presents the design and the experimental characterization of a new multi-band antenna consisting of three folded monopoles dedicated to mobile communication systems. The originality of this paper is to get ...This paper presents the design and the experimental characterization of a new multi-band antenna consisting of three folded monopoles dedicated to mobile communication systems. The originality of this paper is to get the PMR (Professional or Private Mobile Radio) band with the GSM (Global System for Mobile Communications), DCS (Digital Cellular System) and UMTS (Universal Mobile Telecommunications System) bands. The main lobe of the antenna radiates in the zenith direction with a linear polarization over all bands. It is interesting to design the proposed antenna in order to obtain better performances in terms of directive radiation pattern (especially in the PMR band) in comparison with the already existing antenna systems in the wireless market for similar purposes. The prototype was studied with the software CST-MWS (Micro wave studio 2012). The antenna has been designed and successfully measured.展开更多
针对复杂非结构化环境下移动机器人的折展能力与多模式适应性不足的问题,提出了一种由可变径平台和4-URU并联机构组成的可变径多模式移动并联机器人。首先,基于凸轮机构的特性设计了由多根径向伸缩杆组成的可变径平台,并分析了其结构与...针对复杂非结构化环境下移动机器人的折展能力与多模式适应性不足的问题,提出了一种由可变径平台和4-URU并联机构组成的可变径多模式移动并联机器人。首先,基于凸轮机构的特性设计了由多根径向伸缩杆组成的可变径平台,并分析了其结构与受力特性。然后,结合可变径平台的伸缩特性,以4-URU并联机构为主体构建了多模式移动并联机器人,并基于螺旋理论对4-URU并联机构的自由度进行了分析,得到了不同运动模式下的自由度及切换方法。在此基础上,采用ZMP(zero moment point,零力矩点)理论对机器人在各模式下的稳定性进行了评估。最后,通过ADAMS仿真和样机实验验证了机器人在窄缝穿越、单环滚动及双轮越障等模式下的越障性能与稳定性。结果表明,所设计的移动并联机器人兼具良好的折展能力与多模式适应性,可为复杂环境下多功能移动机器人的设计与应用提供新思路。展开更多
基金funded by the Science and Technology Research and Development Program of China Petroleum and Chemical Corporation(No.P06088)Nonprofit Special Research Program(No.200811015)the Land Resource Survey Project of the Ministry of Land and Natural Resources,China(No.1212010782003).
文摘A serial of＂comb-like and trough-like＂folds developed in eastern Sichuan,controlled by the multi-layer detachment folding,is different from the classical Jura-type structure in their development.The key factor resulting in the development of these structures is the occurrence of detachment layers in different parts of Neoprotozoic to Mesozoic stratigraphy of study area,which, from the bottom to the top,are the lower part of Banxi Group,Lower Cambrian（Niutitang Formation）,Lower Silurian（Longmaxi Formation and Luoreping Formation）,Upper Permian （Wujiaping Formation） and Lower Triassic（Daye Formation）.On the basis of field survey combined with sand-box modeling,this study argued that the detachment layer of the lower part of Banxi Group controlled the development of the＂comb-like＂folds,and the lower part of Cambrian detachment layer controlled the development of＂trough-like＂folds.Because of several detachment layers occurring in the study area,the development of duplex structures different scales is an important deformation mechanism,and the duplexes are the important structures distinguished from the typical detachment folding structures.Due to these duplexes,the surface structures and structural highs may not be the structural highs in the depth.Meanwhile,the detachment layers are good channels for oil/ gas migration benefiting the understanding of accumulation and migration of oil and gas.
基金This paper is supported by the National Natural Science Foundation of China (No. 49802022).
文摘The theoretical model and non-homogeneous differential equation of equal thickness multi-layer folds sandwiched in different thickness and same character media are established by elastic and plastic mechanics. The special answer of the non-homogeneous differential equation and the common answer of the homogeneous differential equation are deduced by applying logistic equation and special function, and the dominant wavelength theory of equal thickness multi-layer folds sandwiched in different thickness and same character media. In addition, the experimental folding in both elastic and sticky materials proves the dominant wavelength theory.
基金supported by the Laboratory of Precision Manufacturing Technology of China Academy of Engineering Physics(No.ZZ15007)
文摘A novel multi-beam folded waveguide(MBFW) circuit,which can enhance the output power and interaction efficiency of sub-terahertz(THz) traveling wave tube(TWT),is presented in the paper. Operating with fundamental mode and multiple electron beams means that a larger beam current can be used for a higher output power. The characteristics of the MBFW structure are analyzed and optimized. Compared with the single-beam folded waveguide(SBFW) TWT,the output power of the MBFW TWT increases from 3.64 W to 25.45 W at 140 GHz and its electronic efficiency increases from 1.06% to 7.4% under the conditions of an input peak power of 10 m W,a beam voltage of 9.55 k V and a current of 12 m A. The optimized MBFW structure can be successfully fabricated by micro milling,with dimension errors below expectation,and the measured transmission characteristics are in good agreement with the design.
文摘This paper presents the design and the experimental characterization of a new multi-band antenna consisting of three folded monopoles dedicated to mobile communication systems. The originality of this paper is to get the PMR (Professional or Private Mobile Radio) band with the GSM (Global System for Mobile Communications), DCS (Digital Cellular System) and UMTS (Universal Mobile Telecommunications System) bands. The main lobe of the antenna radiates in the zenith direction with a linear polarization over all bands. It is interesting to design the proposed antenna in order to obtain better performances in terms of directive radiation pattern (especially in the PMR band) in comparison with the already existing antenna systems in the wireless market for similar purposes. The prototype was studied with the software CST-MWS (Micro wave studio 2012). The antenna has been designed and successfully measured.
文摘针对复杂非结构化环境下移动机器人的折展能力与多模式适应性不足的问题,提出了一种由可变径平台和4-URU并联机构组成的可变径多模式移动并联机器人。首先,基于凸轮机构的特性设计了由多根径向伸缩杆组成的可变径平台,并分析了其结构与受力特性。然后,结合可变径平台的伸缩特性,以4-URU并联机构为主体构建了多模式移动并联机器人,并基于螺旋理论对4-URU并联机构的自由度进行了分析,得到了不同运动模式下的自由度及切换方法。在此基础上,采用ZMP(zero moment point,零力矩点)理论对机器人在各模式下的稳定性进行了评估。最后,通过ADAMS仿真和样机实验验证了机器人在窄缝穿越、单环滚动及双轮越障等模式下的越障性能与稳定性。结果表明,所设计的移动并联机器人兼具良好的折展能力与多模式适应性,可为复杂环境下多功能移动机器人的设计与应用提供新思路。
