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Development of space-based diffractive telescopes Review Article
Wei Zhao, Xin Wang, Hua Liu, Zi-feng Lu, Zhen-wu Lu,wangxin971241@163.com,liuhua_rain@aliyun.com
Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 6, Pages 809-962 doi: 10.1631/FITEE.1900529
Keywords： 薄膜衍射光学元件；衍射望远系统；超大口径
Xiong-bin PENG, Guo-fang GONG, Hua-yong YANG, Hai-yang LOU, Wei-qiang WU, Tong LIU
Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 10, Pages 1624-1634 doi: 10.1631/FITEE.1601104
Keywords： Large-scale reflecting telescope Quantitative feedback theory Electro-hydraulic position control system Micron-level position control capability System identification Robust stability
Future Research Trend for Improving Large Reflector Antenna Service Performance
Peiyuan Lian, Congsi Wang, Song Xue, Yan Wang, Yuefei Yan, Qian Xu, Baoyan Duan, Na Wang, Yuhu Duan, Yang Wu
Engineering 2021, Volume 7, Issue 8, Pages 1047-1050 doi: 10.1016/j.eng.2021.05.005
Construction Technology of Shanghai Jinmao Building
Ye Keming,Fan Qingguo
Strategic Study of CAE 2000, Volume 2, Issue 10, Pages 42-49
Shanghai Jinmao building is the 3rd highest building in the world at present. The main building consists of reinforced concrete core wall and exterior structure steel frame. It is rather difficult to construct this edifice in such a poor soil condition in Shanghai. Proceeding from actual facts, Shanghai Construction Groups (SCG) makes efforts to conduct technology innovation, and absorbs advanced experiences domestic and abroad wildly. A unit of unique construction technique and a suitable managing system were developed with the growth of this building. SCG successfully solved a series of construction difficulties including deep-foundation work, mega-columns construction, high - altitude construction and erection, and so on. It only spent 4 years on this building, which set a high-speed record in construction history.
Keywords： Jinmao Building extra-deep slurry wall extra-high building big-size steel tube pile installation of steel structure changeable integrated auto-moving form system
Planar dual-polarized millimeter-wave shared-aperture array antenna with high band isolation Correspondence
Yuyan CAO, Zijun GUO, Zhangcheng HAO
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 10, Pages 1568-1578 doi: 10.1631/FITEE.2200122
A planar millimeter-wave shared-aperture array antenna is proposed and designed in this paper. By composing the substrate integrated waveguide (SIW) and the stripline, the K-band antenna is embedded inside the Ka-band antenna to achieve a smaller size and a low profile by sharing an aperture. The Ka-band antenna radiates through the parallel slot pairs on the surface of the SIW cavities with horizontal polarization, while the K-band antenna radiates through the butterfly-shaped slots with vertical polarization, which are also designed on the surface. Then the two array antennas can radiate by sharing a common aperture with high isolation. To verify this idea, a prototype of an 8×8 shared-aperture array antenna has been designed with center frequencies of 19 and 30 GHz and fabricated using multilayer printed circuit board (PCB) technology. The measurement results show that the −10 dB impedance bandwidths in the K- and Ka-bands are 7.73% and >20%, and the corresponding isolations are higher than 60 and 44 dB, respectively. The proposed shared-aperture antenna has a small footprint, a low profile, and high isolation, and is a promising candidate to design compact millimeterwave wireless systems.
Keywords： 共口径；平面天线；高隔离度；基片集成波导
Extreme-scale parallel computing: bottlenecks and strategies None
Ze-yao MO
Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 10, Pages 1251-1260 doi: 10.1631/FITEE.1800421
Extreme-scale numerical simulations seriously demand extreme parallel computing capabilities. To address the challenges of these capabilities toward exascale, we systematically analyze the major bottlenecks of parallel computing research from three perspectives: computational scale, computing efficiency, and programming productivity. For these bottlenecks, we propose a series of urgent key issues and coping strategies. This study will be useful in synchronizing development between the numerical computing capability and supercomputer peak performance.
Keywords： Extreme scale Numerical simulation Parallel computing Supercomputers
Design of the Optical System with Large Relative Aperture and Large Linear Field of View
Pan Junye
Strategic Study of CAE 2000, Volume 2, Issue 8, Pages 89-90
In this paper following discussion the author concluded that the optical system for IR detecting in the distance should be an total reflecting off-axis aspheric system with large relative aperture and large field of view. A system with diameter φ600 mm, f=1000 mm, and linear field of view ± 5° was designed.
Keywords： IR detecting relative aperture large field of view off-axis system aspheric surface
Water dredging construction method of the super scale caisson
Xia Guoxing,Du Hongchi
Strategic Study of CAE 2010, Volume 12, Issue 4, Pages 25-28
The dimension of the north anchorage of Taizhou Bridge is 67.9 m long, 52 m wide and 57 m high. The water dredging method was adopted at the beginning of the sinking process. The cost of water dredging method is lower than the un drained dredging method and the efficiency is much higher and more controllable. This method can form good sinking direction to assure the sinking velocity and preciseness, especially suitable for the geological condition of clay and clayey. This paper introduced the water dredging construction method of the super scale caisson based on the north anchorage of Taizhou Bridge.
Research of the aerostatic and aerodynamic stability of super long-span cable-stayed bridges
Zhang Xinjun and Sun Hailing
Strategic Study of CAE 2014, Volume 16, Issue 3, Pages 50-58
With the increase of span length，the cable-stayed bridge tends to be a more slender structural system，and consequently the wind stability becomes an important problem for its design and construction. Three-dimensional nonlinear aerostatic and aerodynamic stability analysis of long-span bridges is used to investigate the aerostatic and aerodynamic stability of a super long- span cable- stayed bridge with main span of1400m，and the results are compared with those of a suspension bridge with the similar main span，and considering from the aspect of wind stability，the availability of using the cable- stayed bridge in super long- span bridges whose main span exceeds1000m is discussed. In addition，parametric analysis on the aerostatic and aerodynamic stability of super long-span cable-stayed bridges is conducted including the depthand width of the girder，structure style of the tower，the tower’s height-to-spanratio，the ratio of side span to main span，the auxiliary piers in the side span and the anchorage system of stay cables etc，and the key design parameters are pointed out，and also their reasonable values are proposed. The results show that as compared to the suspension bridge with the same main span，the cable- stayed bridge has greater structural stiffness，and becomes more stable under the static and dynamic wind action，and consequently becomes a favorable structural system for super long- span bridges whose main span exceeds1000m；the super long- span cable- stayed bridge becomes more aerostatically and aerodynamically stable under the cases that the girder depth is increased，the girder width is decreased，the inverse Y-shaped tower is used，the tower’s height is increased，the side span is shortened，the auxiliary piers are installed in side span and the stayed cables are partially earth-anchored.
Keywords： super long-span cable-stayed bridge aerostatic stability aerodynamic stability design parameter
The processing and precision control of large thinwall steel caisson
Peng Wu,Lin Fan,Zhao Qiang,Ma Jianle
Strategic Study of CAE 2010, Volume 12, Issue 4, Pages 21-24
It was discussed the proper choice for processing and welding technology of large thin-wall steel caisson in Taizhou Bridge. According to the caisson's characteristics of large size and thin wall, reasonable welding and assembly methods were adopted to effectively control precision in the processes of fabricating and assembling pieces of each unit and the whole caisson, and the welding and anti-deformation precision of thin-wall steel sheet can be controlled too. Thus the processing quality was guaranteed.
Keywords： large thin-walled steel caisson processing precision control
Bottom sealing construction technology for extralarge onland caisson
Du Hongchi and Yang Ning
Strategic Study of CAE 2012, Volume 14, Issue 5, Pages 19-22
The total quantity of concrete exceeds 30 000 m3 for the north anchor caisson of Taizhou Bridge, which is the largest quantity underwater concrete for bottom sealing construction till now in China, and its construction is quite difficult with high requirements for site organization. This article presents the bottom sealing construction technology for the caisson of north anchor of Taizhou Bridge mainly in the aspects of base cleaning, bottom sealing equipment arrangement and sealing concrete construction technique.
Keywords： extra large on land caisson bottom sealilng construction technology for caisson Taizhou Bridge
Bioprinting of Small-Diameter Blood Vessels Review
Xia Cao, Sushila Maharjan, Ramla Ashfaq, Jane Shin, Yu Shrike Zhang
Engineering 2021, Volume 7, Issue 6, Pages 832-844 doi: 10.1016/j.eng.2020.03.019
There has been an increasing demand for bioengineered blood vessels for utilization in both regenerative medicine and drug screening. However, the availability of a true bioengineered vascular graft remains limited. Three-dimensional (3D) bioprinting presents a potential approach for fabricating blood vessels or vascularized tissue constructs of various architectures and sizes for transplantation and regeneration.
In this review, we summarize the basic biology of different blood vessels, as well as 3D bioprinting approaches and bioink designs that have been applied to fabricate vascular and vascularized tissue constructs, with a focus on small-diameter blood vessels.
Keywords： Bioprinting Small-diameter blood vessel Bioink Vascular engineering
Reasonable Scale of Megacity Central Area Based on Multivariate Data and a Traffic Perspective
Lu Huapu, Bai Zhuotong,Wu Zhouhao, Fu Zhihuan
Strategic Study of CAE 2022, Volume 24, Issue 6, Pages 146-153 doi: 10.15302/J-SSCAE-2022.06.013
The central area of a megacity, which features high-intensity development, large population density, and concentrated urban functions, demonstrates the most prominent urban problems. Addressing the urban malaise in megacities necessitates analyzing and demonstrating the reasonable scale of the megacity central area. This study proposes that commuting time is the core controlling factor determining the reasonable scale of the megacity central area. Combining with point of interest data of multi-type land use and the geographic information system data for street administrative division, we identified the current central urban areas of ten cities in China using big data analysis and the clustering method; their current traffic efficiencies were then evaluated based on path navigation data via web maps and mobile phone signaling data verification. Finally, demonstration results were presented through quantitative analysis. Our study shows that the current central areas of the ten megacities cannot satisfy residents' need for a proper commuting time; considering factors such as technological development and improvement in the level of governance, 13‒15 km is the upper limit of equivalent radius for the central area of a megacity.
Keywords： reasonable scale multivariate data central urban area megacity happiness
The construction and key techniques of the Fourth Nanjing Yangtze River Bridge
Wu Huanling
Strategic Study of CAE 2013, Volume 15, Issue 8, Pages 4-11
The Fourth Nanjing Yangtze River Bridge is the first suspension bridge of three-span steel box girder using continuity and flexible bearing system with a main span of 1418 m, and makes use of the flexible bearing system and distributional force transmission system with main rope for the first time. It overcomes the deep foundation design and construction technical problems of oversized "∞" shape diaphragm wall and ultra-large well-sinking under complicated geological conditions, proposes the technologies of main rope mixed-knit and argon-rich gas shielded arc welding, and uses the pavement technique of compound gussasphalt at steel bridge deck. Additionally, it utilizes synthetical technique to control construction quality of bulk mass concrete. This text summarizes the construction management and key technical innovation.
Keywords： construction management key technical innovation complicated geological conditions oversized “∞” shape diaphragm wall ultra-large well-sinking
Zhiqiang Wang, Jiawei Liu, Jun Wang, Guangrong Yue,wangzq@std.uestc.edu.cn,842927584@qq.com,junwang@uestc.edu.cn,yuegr@uestc.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 4, Pages 560-570 doi: 10.1631/FITEE.2000451
Keywords： 超大规模相控阵；毫米波；波束倾斜；Zadoff-Chu；单载波频域均衡
Title Author Date Type Operation
Development of space-based diffractive telescopes
Wei Zhao, Xin Wang, Hua Liu, Zi-feng Lu, Zhen-wu Lu,wangxin971241@163.com,liuhua_rain@aliyun.com
Journal Article
Quantitative feedback controller design and test for an electro-hydraulic position control system in a large-scale reflecting telescope
Xiong-bin PENG, Guo-fang GONG, Hua-yong YANG, Hai-yang LOU, Wei-qiang WU, Tong LIU
Journal Article
Future Research Trend for Improving Large Reflector Antenna Service Performance
Peiyuan Lian, Congsi Wang, Song Xue, Yan Wang, Yuefei Yan, Qian Xu, Baoyan Duan, Na Wang, Yuhu Duan, Yang Wu
Journal Article
Planar dual-polarized millimeter-wave shared-aperture array antenna with high band isolation
Yuyan CAO, Zijun GUO, Zhangcheng HAO
Journal Article
Design of the Optical System with Large Relative Aperture and Large Linear Field of View
Pan Junye
Journal Article
Water dredging construction method of the super scale caisson
Xia Guoxing,Du Hongchi
Journal Article
Research of the aerostatic and aerodynamic stability of super long-span cable-stayed bridges
Zhang Xinjun and Sun Hailing
Journal Article
The processing and precision control of large thinwall steel caisson
Peng Wu,Lin Fan,Zhao Qiang,Ma Jianle
Journal Article
Bottom sealing construction technology for extralarge onland caisson
Du Hongchi and Yang Ning
Journal Article
Bioprinting of Small-Diameter Blood Vessels
Xia Cao, Sushila Maharjan, Ramla Ashfaq, Jane Shin, Yu Shrike Zhang
Journal Article
Reasonable Scale of Megacity Central Area Based on Multivariate Data and a Traffic Perspective
Lu Huapu, Bai Zhuotong,Wu Zhouhao, Fu Zhihuan
Journal Article
The construction and key techniques of the Fourth Nanjing Yangtze River Bridge
Wu Huanling
Journal Article
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