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Design, development, and performance of an ammonia self-managed vaporization propulsion system for micro-nano satellites Regular Article
Shu-jian Sun, Tao Meng, Zhong-he Jin,sunshujian@zju.edu.cn,mengtao@zju.edu.cn
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 11, Pages 1516-1529 doi: 10.1631/FITEE.1800068
Keywords： 自主汽化管理；液氨；毫牛量级推进技术；微推力；高精度轨道控制；微纳卫星
Lateral Vibration Analyses of Flying Vehicle under Thrust and Drag
Song Jian
Strategic Study of CAE 2000, Volume 2, Issue 10, Pages 63-72
In this paper, the influence of thrust and air drag on rocket lateral vibration is studied, and the frequency reduction under the thrust and drag is analyzed. The formulas for evaluation of the changes of frequencies and vibration modes are obtained. The equations of transverse movement when nozzle connected rigidly with rocket and related boundary conditions form the basis for analyses. The conclusions obtained are applicable for active accelerating and passive decelerating parts of trajectory as well as the cruise flight when thrust and drag are balanced. The analyses show that for small thrust and small axial overload, the discrepancy resulted from different calculation methods is not big, whereas for the heavy overloaded case a more accurate solution is extremely necessary.
Keywords： aircraft rocket lateral vibration thrust and drag vibration mode and frequency
Prospects of Microsystems Research and Development
Zhong Xianxin
Strategic Study of CAE 2000, Volume 2, Issue 1, Pages 81-84
The microsystems research and development extends into various fields including the micro electronic, micro machine, micro-optics, chemistry, biotechnology and materials, making it a multidisciplinary technology integrating various technologies and knowledges. When considering potential uses in future, microsystems technologies are still at the elementary stage. Research today is mainly centered on fundamental technologies common to various microsystems.
May be the focus of the microsystems research and development as followings： science and technology at the microdomain, new signal sensing, transmission and processing technique, nanometer measurement and operation ,new microsystem materials, microfabrication technique.
Keywords： microsystems microdomain sensing and processing nanometer measurement new materi-als microfabrication
Preliminary Analysis on the May 1st Landslide at Wulong
Wang Jianfeng,Li Shihai,Yan Lin,Dong Dapeng
Strategic Study of CAE 2002, Volume 4, Issue 4, Pages 22-28
A 9-story brick-concrete building rapidly collapsed due to a landslide in Wulong County, China, on May 1st, 2001.The failure took place at the beginning of the rainy season. This paper discusses a number of scenarios to highlight the background geology, possible causes and mechanisms of the rapid movement, as well as the possible perched water conditions and the influence of man-made changes in the morphology. Of particular importance are preceding some related back analyses. For this, at first, a 2-D rigid-body limit equilibrium analysis is carried out in the present paper considering various related loads applied on the slope. Then, based on the geometric data investigated in the field and assuming the slide mass holding limit equilibrium, the shear strength parameters are back calculated out. The parameters are further used for back analyses of the landslide in order to explore the cause of landslide occurred through changing the cut-slope shape and groundwater table. The presented spreadsheet method is another contribution from this paper. Through the work, the authors conclude that apart from possible defects in the structure, it is certain that the landslide initiated the building collapse. Intense rainfalls must have increased water content, and hence fluidity of sandy clay intersected in the beds and layers of the sandstone. The process of excavation prior to building construction may have participated in the loss of stability.
Keywords： Wulong landslide reliability back analysis the residual thrust method slope stability
Micro-seismic signal propagation of low attenuation
Xiao Jian,Sun Shuting,Liu Jianzhong
Strategic Study of CAE 2014, Volume 16, Issue 8, Pages 83-87
This article explored the possibility of spread of weak seismic signals and low attenuation. The results showed that both underground seismic signal propagation medium showed a degree of elasticity，the vibration signal amplitude，just below the elastic limit attenuation is very small，showing low attenuation characteristics. This feature ensures that on the ground，and even the loess coverage area of micro seismic signal detected.
Keywords： micro-seismic low attenuation inelastic attenuation
Microseismic monitoring technology
Tang Chunhua,Gu Guangqing
Strategic Study of CAE 2012, Volume 14, Issue 4, Pages 95-99
Microseismic (MS) monitoring is a hot topic in the applied geophysics recently. The MS mechanism and histories are introduced firstly in this article, and then the instruction of the MS equipment such as acquisition strategies, optimal sensors, array design, digital-signal processing, event location, velocity calibration, and monitoring deployment, is discussed. MS is a great technology with a long future, and we need to foster the understanding and acceptance of this technology.
Keywords： microseismic monitoring hydraulic fracturing oil and natural gas SNR (signal to noise ratio) event location
Micro-Intervention Rural Planning Based on Cultural Heritance
Guo Haian
Strategic Study of CAE 2019, Volume 21, Issue 2, Pages 27-33 doi: 10.15302/J-SSCAE-2019.02.019
For a long time, rural planning has been following the system of urban planning and design, and the results of rural planning are expressed in general maps or aerial views. Many local governments have made rounds of planning, but only little improvement has been made on rural landscape. This results from the neglect of the inherent cultural heritance of villages and the inherent role of cultural values. Urban planning and design methods cannot be used directly to demarcate rural areas. Therefore, we need to form a new planning and design theory which considers rural culture heritance. The micro-intervention planning theory is a cultural-guided planning strategy for rural revival, where the rural areas are transformed and revived using a progressive approach. This strategy is more suitable for rural planning than the big-scale demolition and reforms being conducted in the new round of rural planning process in China.
Keywords： rural planning micro-intervention planning consequential fault-tolerant rural culture rural revival
Application of microseismic monitoring technology in Daqing Oilfield A block well net design
Ma Jisheng
Strategic Study of CAE 2012, Volume 14, Issue 4, Pages 74-76
The artificial fracture position and the well row direction influence the exploitation effect of low permeability reservoir. In the process of creating artificial fractures, we apply microseismic to monitor their direction, location, orientation, length and height, and determine the well alignment direction combined with the stress orientation, all of which establish well foundation for improving the development effect of A block.
Keywords： microseismic monitoring artificial fracture well pattern design
Wang Guoshun,Liu Jianzhong,Liu Linwang
Strategic Study of CAE 2012, Volume 14, Issue 4, Pages 40-44
This paper describes arrival time of microseismic signals, which were obtained from monitoring fracturing and waterfloodand were used to interpolate mechanisms of micro-earthquake and verify reliability of fracturing and waterflood monitoring. It shows that fracture orientation, waterflood front geometry, and microseismic mechanism nodal plane are consistent, and monitoring results are reliable. This study depicts a selfcheck approach to verify dependability of microseismic mapping itself, and it is an important measurement method for fracturing and waterflood projects of deep formations when no alternative verifications are viable.
Keywords： microseismic fracture waterflood performance waterflood front
Mechanically Strong Proteinaceous Fibers: Engineered Fabrication by Microfluidics Review
Jing Sun, Jingsi Chen, Kai Liu, Hongbo Zeng
Engineering 2021, Volume 7, Issue 5, Pages 615-623 doi: 10.1016/j.eng.2021.02.005
Lightweight and mechanically strong natural silk fibers have been extensively investigated over the past decades. Inspired by this research, many artificial spinning techniques (wet spinning, dry spinning, electrospinning, etc.) have been developed to fabricate robust protein fibers. As the traditional spinning methods provide poor control over the as-spun fibers, microfluidics has been integrated with these techniques to allow the fabrication of biological fibers in a well-designed manner, with simplicity and cost efficiency. The mechanical behavior of the developed fibers can be precisely modulated by controlling the type and size of microfluidic channel, flow rate, and shear force. This technique has been successfully used to manufacture a broad range of protein fibers, and can accelerate the production and application of protein fibers in various fields. This review outlines recent progress in the design and fabrication of protein-based fibers based on microfluidics. We first briefly discuss the natural spider silk-spinning process and the microfluidics spinning process. Next, the fabrication and mechanical properties of regenerated protein fibers via microfluidics are discussed, followed by a discussion of recombinant protein fibers. Other sourced protein fibers are also reviewed in detail. Finally, a brief outlook on the development of microfluidic technology for producing protein fibers is presented.
Keywords： Proteinaceous fibers Microfluidics Soft materia l Biomaterials
Microseismic monitoring technology development direction and application
Liu Jianzhong,Tang Chunhua,Zuo Jianjun
Strategic Study of CAE 2013, Volume 15, Issue 10, Pages 54-58
This paper discussed the development direction of microseismic monitoring technology, pointed out that improve the quality of microseismic monitoring system, reduce the front end noise of the instrument, record more and smaller microseismic, tamp the theoretical foundation of microseismic monitoring, and increase the number of microseismic monitoring stations so as to obtain more information that can be compared are important directions for the development of microseismic technology. The introduction of conventional seismic exploration theory can also increase the level of microseismic monitoring, and form complete theory of microseismic. Above are important directions of microseismic monitoring technology development. With the development of technology, microseismic monitoring technology can also be used in seismic exploration and safety prediction of mine, reservoir besides oilfield fracturing and water monitoring.
Keywords： microseismic monitoring seismic prospecting fracturing monitoring water monitoring
Measurement and Control Technology for the Array of Low Cost PCR Microreactors
Li Xianming ,Zhang Yulin ,Li Jiantian
Strategic Study of CAE 2007, Volume 9, Issue 7, Pages 76-81
In this paper a new style of polymerase chain reaction(PCR)equipment is studied and the goal of the study is to reduce the cost of micro-reactor PCR chips, improve its reliability and make a hundred of chips working together in the same time. There are no micro-sensors and micro-heaters in the chips. It is the concrete way to reduce the cost of PCR chips and improve the reliability of the chips. So the focus of the study transfers from the design, simulation and processing to the measurement and control of the chips. The measurement and control scheme for the low-cost PCR chips is designed. By selecting several chips as model chips and combining unitized macroscopic control and distributed microcosmic control, the system is able to do temperature cycling control to the chip array which is made of many chips at the same time. The loading effect applied to the temperature field by the temperature sensor and the compensation method for the loading effect are studied. The main idea of this method is to compare the measurement result gained from the temperature field in which two sensors are set with the measurement result gained from the same temperature field but in which one sensor is set, and the difference is the loading effect that one sensor applies to the temperature field. The temperature measurement errors to the liquid internal the model chips are analyzed and synthesized in considerable detail and an intelligent prediction compensation method for dynamic measurement errors is obtained. The uncertainty of indirect to the temperature of PCR liquid in low-cost PCR chips is also assessed. Cascade control strategy is applied to further improving the performance of control system. Its performance in temperature cycling meets the requirements of PCR.
Keywords： microreactors measurement control polymerase chain reaction
Research of seismic events waveform in deep copper mine
Yang Zhiguo,Yu Runcang,Guo Ran
Strategic Study of CAE 2008, Volume 10, Issue 8, Pages 69-72
In order to better understand the regularities of rockburst occurrence,Dongguashan Copper Mine has installed an ISSI seismic monitoring system, which can make a real-time monitoring of rock mass respond to mining. This paper briefly described the layout of the monitoring system in Dongguashan Copper Mine,then analyzed how to process various kinds of event waveforms. By contrasting the different locations resulting from the automatic processing and the artificial processing, it is confirmed that the accuracy of an event location has been improved greatly by the artificial processing, which will make the calculation of seismic source parameters even more accurate. Based on the corresponding relations between waveforms recorded and mining practice, the event waveforms are assorted, which can identify events quickly. According to the analysis results of a detecting blast and an identified seismic event,the waveform analysis method put forward in this paper is validated. It will establish a sound basis for subsequent analysis of the stress or strain status,delineation of hazardous areas of rock mass and adoption of reasonable measures.
Keywords： deep mining rockburst seismic monitoring waveform analysis
Mechanism and Modeling for Polymerization of Acrylamide in Inverse Microemulsions
Li Xiao,Zhang Weiying,Yuan Huigen
Strategic Study of CAE 2003, Volume 5, Issue 1, Pages 69-73
After discussion on the mechanism of polymer particle nucleation and growth in inverse microemulsion polymerization, a schematic physical model for polymerization of acrylamide in inverse microemulsions was presented. Furthermore, several key problems in mathematically modeling of inverse microemulsion polymerization were pointed out.
Keywords： inverse microemulsion polymerization mechanism modeling acrylamide
Microseismic monitoring application for waterflooding in No.6 oil reservior of Yanchang Oilfield
Hao Shiyan,Wang Yongdong
Strategic Study of CAE 2012, Volume 14, Issue 4, Pages 8-11
This paper discusses the long 6 extend oilfield injection wells because the transfer group and the leading edge of microseismic monitoring of water. Yanchang Oil Field Oil Production Plant 4237 Zichang water injection wells set the direction of NEE to the front edge by the impact of in situ stress field in the direction of the strong. That injector network layout should also refer to the in-situ stress field direction and the original crack direction.
Keywords： Yanchang Oilfield water-flooding extraction microseismic monitoring water-flood front
Title Author Date Type Operation
Design, development, and performance of an ammonia self-managed vaporization propulsion system for micro-nano satellites
Shu-jian Sun, Tao Meng, Zhong-he Jin,sunshujian@zju.edu.cn,mengtao@zju.edu.cn
Journal Article
Preliminary Analysis on the May 1st Landslide at Wulong
Wang Jianfeng,Li Shihai,Yan Lin,Dong Dapeng
Journal Article
Micro-seismic signal propagation of low attenuation
Xiao Jian,Sun Shuting,Liu Jianzhong
Journal Article
Application of microseismic monitoring technology in Daqing Oilfield A block well net design
Ma Jisheng
Journal Article
Analysis of using microseismic monitoring to verify fracturing and waterflood on reservoir Chang 8 of Zhengjing Oilfield
Wang Guoshun,Liu Jianzhong,Liu Linwang
Journal Article
Mechanically Strong Proteinaceous Fibers: Engineered Fabrication by Microfluidics
Jing Sun, Jingsi Chen, Kai Liu, Hongbo Zeng
Journal Article
Microseismic monitoring technology development direction and application
Liu Jianzhong,Tang Chunhua,Zuo Jianjun
Journal Article
Measurement and Control Technology for the Array of Low Cost PCR Microreactors
Li Xianming ,Zhang Yulin ,Li Jiantian
Journal Article
Research of seismic events waveform in deep copper mine
Yang Zhiguo,Yu Runcang,Guo Ran
Journal Article
Mechanism and Modeling for Polymerization of Acrylamide in Inverse Microemulsions
Li Xiao,Zhang Weiying,Yuan Huigen
Journal Article
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