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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

Abstract: An ammonia propulsion (ASVP) system for s is presented. Compared with a normal cold gas or liquefied gas propulsion system, a multiplex parallel sieve type vaporizer and related vaporization control methods are put forward to achieve of liquefied propellant. The problems of high vaporization latent heat and incomplete vaporization of are solved, so that the ASVP system takes great advantage of high theoretical specific impulse and high propellant storage density. Furthermore, the ASVP operation procedure and its physical chemistry theories and mathematical models are thoroughly analyzed. An optimal strategy of thrust control is proposed with consideration of thrust performance and energy efficiency. The ground tests indicate that the ASVP system weighs 1.8 kg (with 0.34-kg propellant) and reaches a specific impulse of more than 100 s, while the power consumption is less than 10 W. The ASVP system meets multiple requirements including high specific impulse, low power consumption, easy fabrication, and uniform adjustable thrust output, and thus is suitable for s.

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

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The research on the technology adrancement and construction management of China’s highway bridge

Feng Maorun

Strategic Study of CAE 2011, Volume 13, Issue 10, Pages 93-98

Abstract:

With sustained development of economy, large scale highway bridge construction has been undertaken in the past three decades in China. Guided by the policy of "independent construction ,independent in novation", bridge construction technology has developed in a big stride and reached world advanced level. At the same time, the highway construction management system has been transformed from relying on administrative means to market mechanism and modern project management mode has been continuously explored in extra-large project construction. This paper discussed and analyzed project cases and historical experience of the bridge construction from the perspective of technological innovation, project management and sustainable development.

Keywords： highway bridge self-construction self-innovation modern project management integration durability maintenance management social management

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Pervaporation membrane separation technology and its application

Li Jiding,Yang Zheng and Jin Xiayang

Strategic Study of CAE 2014, Volume 16, Issue 12, Pages 46-51

Abstract:

Membrane separation technology is contemporarily a high and new technology in chemical engineering. It has been consequently developed rapidly in recent 30 years due to the availability of solving many serious problems， such as energy， resources and environment. Membrane separation technology of pervaporation as a novel separation technology is typically energy-saving and cleaner-production technology. Compared to the conventional azeotropicdistillation and extractive distillation applied to azeotropic systems， pervaporation process could lead to an energy saving of 1/3～1/2 and decrease operating costs even no less than 50 %. The industrial applications of the pervaporation dehydration over the world are introduced， and research progresses and industrial feasibilities of several pervaporation membranes are shown in this paper， which cover gasoline desulfurization membranes， methanol and ethanolpermselective membranes， dimerthyl carbonate/methanol and arene/alkane separation membranes.

Keywords： pervaporation membrane technology separation energy saving

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Treatment of organic wastewater containing salt by PDMS hollow fiber pervaporation membrane

Li Junjun,Gu Jin,Sun Yuping,Zhang Lin,Lei Lecheng

Strategic Study of CAE 2014, Volume 16, Issue 7, Pages 68-72

Abstract:

In this paper, the composite membrane of polydimethylsiloxane(PDMS)/polyvinylidene fluoride (PVDF) is prepared by cross-linking reaction of PDMS and triethoxyvinylsilane on PVDF hollow fiber membrane surface.Themembranesare characterized with scanning electronmicroscopyandattenuated total reflection Fourier transform infrared spectrum.Thepervaporation performance is investigated by separation of three simulate saline organic wastewaters, n-butanol-water, isopropanol-water and acetone-water, the effect of temperature on membrane separation performance is also determined. The results show that the membranes have good performance for separation of three saline organic wastewaters, when the operating temperature is 40 oC, the membranes exhibit the permeate flux of 275.95 g/m²·h,322.16 g/m²·h,489.76 g/m²·h, and separation factor is 37.82,12.60,33.12, respectively.

Keywords： pervaporation PDMS hollow fiber membrane saline organic wastewater

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Scientific and Technological Issues for the Intelligent Management of Air Traffic

Zhu Yongwen , Chen Zhijie , Pu Fan , Wang Qi

Strategic Study of CAE 2023, Volume 25, Issue 5, Pages 185-191 doi: 10.15302/J-SSCAE-2023.07.010

Abstract:

Air traffic is exhibiting the characteristics of large flow, strong coupling, and high time variation. To ensure its smooth, efficient, safe, and reliable operation, an intelligent model for air traffic management that features digitalization, automation, and collaboration needs to be developed. This study reviews the current and future demand for air traffic management and analyzes the challenges faced by traditional air traffic management from the aspects of traffic control, airspace management, and flow control. It also summarizes four basic scientific problems: interaction mechanism and mode between aircraft and air control infrastructure, air– ground coordinated control of aircraft intervals based on acceptable risks, airspace operation modeling and optimization considering multiple factors and based on non-uniform rules, and evolution mechanism and congestion propagation features of high-density air traffic flow. Moreover, it is suggested to integrate the application of satellite Internet, big data, digital twin, cloud computing, and other frontier technologies, and build an intelligent management technology system for air traffic from the aspects of aircraft, airspace, control decision-making, and operation, thereby laying a technical foundation for the construction of a next-eneration air traffic management system.

Keywords： air traffic intelligent management artificial intelligence digital airspace air–ground autonomous cooperation

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Study of zeolite membranes for pervaporation dehydration and their applications

Gu Xuehong,Xu Nanping

Strategic Study of CAE 2014, Volume 16, Issue 12, Pages 52-58

Abstract:

A seeding method by rubbing-dipcoating and induction with ball-milled seeds was developed to synthesize NaA zeolite membrane. The synthesis approach could improve the rate of qualified membranes and reduce the synthesis time efficiently，which is suitable for large-scale production of zeolite membranes. Mass transfer mechanism of organic solvent and water in a zeolite membrane was investigated with molecular simulation method. The stability of NaA zeolite membranes in hydrothermal，acid-base and salty environments was systematically studied. A pretreatment method was then proposed and industrial pervaporation plants were built up，which have been operated steadily for long term.

Keywords： pervaporation zeolite membrane organic dehydration industrial application

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Independent Development：The Way to Build up the Strength of a Country

Jin Lüzhong

Strategic Study of CAE 2005, Volume 7, Issue 7, Pages 1-6

Abstract:

The paper expounds the significance of independent development in the fields of politics, military affairs, economy, security, science and technology, etc. It suggests that most of industries in China be provided with the capability of independent development and international competitiveness within 10〜15 years. It analyzes the possibility for achieving this goal. The paper also suggests that the environment favorable to independent development be created in the aspects of ideology, spirit, laws and regulations, policies, system as well as dissemination and public opinion.

Keywords： independent development goal possibility

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European Union Puts Teeth in Right to Repair

Sean O´Neill

Engineering 2021, Volume 7, Issue 9, Pages 1197-1198 doi: 10.1016/j.eng.2021.07.007

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Studies on Autonomous Navigation Techniques for Navigation Constellations

Shuai Ping,Qu Guangji,Chen Zhonggui

Strategic Study of CAE 2006, Volume 8, Issue 3, Pages 22-30

Abstract:

If the autonomous navigation techniques are applied to a navigation constellation, the number of the ground control stations, the message injecting frequency from the ground stations to satellites and system maintenance cost may be reduced significantly. Meanwhile, the integrity of navigation messages can be monitored in the real-time mode and the survivability of the navigation system also enhanced. The autonomous navigation will be gradually a main research subject for the next generation navigation satellite system. Firstly, the information processing flow of the autonomous navigation constellation is described systematically in this paper. Secondly, the key techniques to realize the autonomous navigation for the navigation constellation, including the long-term prediction of the ephemerides and clock parameters, establishment and maintenance for the cross measurement and communication links, autonomous time synchronization, autonomous ephemeris updating, robust filtering, establishment of the constellation rotation models, long-term prediction of the earth rotation and polar drift parameters, are presented as an important part of the paper. Moreover, the approaches to actualize the key techniques are analyzed and the relative mathematic models are also demonstrated in detail. Finally, the autonomous time synchronization and ephemeris updating are simulated. It is clearly shown from the simulated results that by processing the inter-satellite measurement data with the on-board Kalman filters and updating continually the clock parameters and ephemerides, the time synchronization and ephemeris updating among the satellites can be implemented autonomously and highly-accurately. Therefore, the reasonability and feasibility of the information processing flow and key technical algorithms for the autonomous navigation constellation are validated preliminarily.

Keywords： navigation constellation autonomous navigation information processing flow system simulation

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Building Chinese Brand Parts System to Consolidate the Foundation of Automobile Power

Li Kaiguo,Deng Xiaozhi,Shen Bin and Wu Shengnan

Strategic Study of CAE 2018, Volume 20, Issue 1, Pages 133-138 doi: 10.15302/J-SSCAE-2018.01.019

Abstract:

The automobile parts industry is the foundation of automobile power and is the main driving force promoting the development of the automobile industry. All automobile power countries have a strong parts industry. Now China is in a critical period of growing from a large automobile to automobile power, but it is difficult for the development of the parts industry to support the development of the automobile industry. Through the analysis of problems and opportunities for the development of China’s parts industry, we suggest building a complete independent parts system through strengthening the industrial base, expanding the scale of independent support, and cultivating leading companies to consolidate the development foundation and support the development of automobile power.

Keywords： automobile power component system independent suggestion

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Innovation self, Technology Learning and Elevation of Industry Competence — Case of Taiwan IC Industry

Lu Rui,Sheng Zhaohan

Strategic Study of CAE 2007, Volume 9, Issue 8, Pages 35-39

Abstract:

Following Taiwan IC industry development, the paper analyzes its technology innovation and its elevation of industry competence by technology learning and innovation-self. Moreover, the paper advance some suggestions for chinese mainland.

Keywords： technology learning innovation-self industry competence IC industry

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Systems perspective and approach in space engineering management

Guo Baozhu

Strategic Study of CAE 2011, Volume 13, Issue 4, Pages 43-47

Abstract:

Space engineering management is complexity management, and the perspective and approach of systems science is throughout the entire content and all stages of management. This paper discusses the application of systems perspective and approach from technical management, large complex technical projects and organizational management which are the three basic aspects of space engineering management.

Keywords： space engineering management system engineering approach technical management large complex technical projects organizational management

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The Way in Development of China's Auto Industry: Cooperation & Self-Reliance

Guo Konghui

Strategic Study of CAE 2004, Volume 6, Issue 8, Pages 17-20

Abstract:

The paper gives an observation and review of serious arguments on the way in development of China's auto industry, presents some points on the way out for the auto industry, and explains that China will be able to march on the sustainable development path through balancing win-win cooperation against selfreliance.

Keywords： china's auto industry way in development cooperation & self-reliance

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SESAR: The Past, Present, and Future of European Air Traffic Management Research Perspective

Tatjana Bolić, Paul Ravenhill

Engineering 2021, Volume 7, Issue 4, Pages 448-451 doi: 10.1016/j.eng.2020.08.023

Abstract:

The Single European Sky ATM Research (SESAR) project is the technological pillar of the European Commission’s Single European Sky Initiative to modernize air traffic management (ATM). Here, we describe the process of establishing SESAR and the main parts of the project: the research and development (R&D) part, which is led by the SESAR Joint Undertaking; the deployment part, which is managed by the SESAR Deployment Manager; and the European ATM Master Plan, which collects and lays out both the R&D and deployment needs. The latest European ATM Master Plan was adopted just prior to the current pandemic. The huge loss in air traffic due to the pandemic, and the speed of the recovery of the aviation industry will require reprioritization, but the main elements that have been established—particularly those in support of the environment—remain valid.

Keywords： SESAR Air traffic management (ATM) Single European Sky ATM research and development ATM solution Deployment

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Contract management is the key of item management——the experience of international contract management of Xiaolangdi Water Complex

Zhang Jiyao

Strategic Study of CAE 2011, Volume 13, Issue 4, Pages 54-67

Abstract:

Xiaolangdi Water Complex is the important control project to treat Yellow River, which got great attention of the water project field with the complex geology, difficult design, high demand for technology and difficult management. Especially because of tendering in every aspect internationally, it became the first international item of our country. Until now, Xiaolangdi Water Complex has operated for 10 years, which brought large social, economic and ecological benefits. However, the contractors from 40 countries and districts had conflicts with the project owner according to the contract management for their own benefits. The project owner──the Construction and Management Bureau of Xiaolangdi Project, supported by many aspects, constructed the project with high quality, and properly treated each complex dissension, accumulated important international contract management experience. Now China is carrying "Walking out" strategy, so the paper aimes to give reference for the constructer and investor of international project.

Keywords： item management contract management Xiaolangdi Water Complex