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General Review of the Study on the Toroidal Drive

Xu Lizhong,Yang Yulin,Huang Zhen

Strategic Study of CAE 2000, Volume 2, Issue 6, Pages 84-88

Abstract: The paper reviews the origin and present study conditions of the drive.The present problems for the drive are also analyzed.

Keywords： toroidal drive present study situation present problems future study direction

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The Present Situation, Problems and Countermeasures of Agricultural Ecological Protection in China

Bian Yousheng

Strategic Study of CAE 2000, Volume 2, Issue 12, Pages 16-20

Abstract: This paper introduces present situation and major problems in the field of agro-ecological protection

Keywords： agricultural environment ecological protection countermasure

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Consideration on Present Quality Problems of Hydraulic Power Projects in China

Wen Fubo,Zheng Shouren

Strategic Study of CAE 2002, Volume 4, Issue 1, Pages 36-40

Abstract:

From the quality problems existing in hydraulic power projects at present in China, the emerging causes

Keywords： hydropower project quality countermeasures

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Renewable power for China: Past, present, and future

Eric MARTINOT

Frontiers in Energy 2010, Volume 4, Issue 3, Pages 287-294 doi: 10.1007/s11708-010-0120-z

Abstract: This paper briefly examines the history, status, policy situation, development issues, and prospects for key renewable power technologies in China. The country has become a global leader in wind turbine and solar photovoltaic (PV) production, and leads the world in total power capacity from renewable energy. Policy frameworks have matured and evolved since the landmark 2005 Renewable Energy Law, updated in 2009. China’s 2020 renewable energy target is similar to that of the EU. However, China continues to face many challenges in technology development, grid-integration, and policy frameworks. These include training, research and development, wind turbine operating experience and performance, transmission constraints, grid interconnection time lags, resource assessments, power grid integration on large scales, and continued policy development and adjustment. Wind and solar PV targets for 2020 will likely be satisfied early, although domestic demand for solar PV remains weak and the pathways toward incorporating distributed and building-integrated solar PV are uncertain. Prospects for biomass power are limited by resource constraints. Other technologies such as concentrating solar thermal power, ocean energy, and electricity storage require greater attention.

Keywords： renewable energy wind power solar power sustainable energy policy green industry

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The past, present and future of bovine pluripotent stem cells: a brief overview

Xiuchun TIAN

Frontiers of Agricultural Science and Engineering 2019, Volume 6, Issue 1, Pages 3-7 doi: 10.15302/J-FASE-2018247

Abstract:

Although the pursuit of bovine embryonic stem cells started more than 26 years ago for the purpose of gene-targeting, true pluripotent stem cells in this economically important species are still elusive. With the rapid advances in genome-editing and cloning using homologously recombined somatic cells, the need for pluripotent stem cells for precise genetic modification in any species became questionable. With the pig being the better model for human regenerative biology, the identification of the commonalities and uniqueness of the pluripotency circuitry across mammalian species may be the main objective for studying pluripotent stem cells in the bovine.

Keywords： bovine embryonic induced pluripotent stem cells

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Laparoscopic hepato-biliary-pancreatic surgery: present practices and prospects

Yongjun Chen, Renyi Qin, Xiaoping Chen

Frontiers of Medicine 2011, Volume 5, Issue 3, Pages 235-238 doi: 10.1007/s11684-011-0156-4

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Effects of hydraulic retention time on net present value and performance in a membrane bioreactor treating

Dawei Yu, Jianxing Wang, Libin Zheng, Qianwen Sui, Hui Zhong, Meixue Cheng, Yuansong Wei

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 6, doi: 10.1007/s11783-020-1280-7

Abstract: membrane bioreactor, both full-scale (500 m3/d) and pilot (1.0 m3/d), were used to calculate the net presentTank construction cost was decisive in determining the net present value contributed 62.1% to the capital

Keywords： Antibiotic production wastewater Net present value Membrane bioreactor Hydraulic retention time Pollutant

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Co-present Pb(II) accelerates the oxidation of organic contaminants by permanganate: Role of Pb(III)

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 8, doi: 10.1007/s11783-022-1530-y

Abstract:

• Simultaneous removal of organic contaminants and Pb(II) was achieved by Mn(VII).

Keywords： Permanganate Pb(II) oxidation MnO₂ pH effect

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Basic research on machinery fault diagnostics: Past, present, and future trends

Xuefeng CHEN, Shibin WANG, Baijie QIAO, Qiang CHEN

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 2, Pages 264-291 doi: 10.1007/s11465-018-0472-3

Abstract:

Machinery fault diagnosis has progressed over the past decades with the evolution of machineries in terms of complexity and scale. High-value machineries require condition monitoring and fault diagnosis to guarantee their designed functions and performance throughout their lifetime. Research on machinery Fault diagnostics has grown rapidly in recent years. This paper attempts to summarize and review the recent R&D trends in the basic research field of machinery fault diagnosis in terms of four main aspects: Fault mechanism, sensor technique and signal acquisition, signal processing, and intelligent diagnostics. The review discusses the special contributions of Chinese scholars to machinery fault diagnostics. On the basis of the review of basic theory of machinery fault diagnosis and its practical applications in engineering, the paper concludes with a brief discussion on the future trends and challenges in machinery fault diagnosis.

Keywords： fault diagnosis fault mechanism feature extraction signal processing intelligent diagnostics

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IV) solvent extraction enhancement in high acidity using di-(2-ethylhexyl)phosphoric acid with [Cl] present

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 1, Pages 56-67 doi: 10.1007/s11705-022-2185-8

Abstract: Separation of vanadium from black shale leaching solution at low pH is very meaningful, which can effectively avoid the generation of alkali neutralization slag and the resulting vanadium loss. In this study, coordination mechanism of vanadium in acid leaching solution at low pH was investigated with the intervention of chloride ions. Under the conditions of pH 0.8, di-(2-ethylhexyl)phosphoric acid concentration of 20%, phase ratio of 1:2, and extraction time of 8 min, the vanadium extraction could reach 80.00%. The Fourier transform infrared and electrospray ionization results reveal that, despite the fact that the chloride ion in the leachate could significantly promote vanadium extraction, the chloride ion does not enter the organic phase, indicating an intriguing phenomenon. Among Cl⁻–V, SO₄²⁻–V, and H₂O–V, the V–Cl bond is longer and the potential difference between coordinate ions and vanadium is smaller. Therefore, VO²⁺ gets easily desorbed with chloride ions and enter the organic phase. At the same time, the hydrogen ions of di-(2-ethylhexyl)phosphoric acid also enter the water phase more easily, which reduces the pH required for the extraction reaction.

Keywords： vanadium black shale solvent extraction high acidity extraction

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Present situation and classification of piezoelectric pump

Fang YE, Shouyin WANG, Wei CHENG, Qixiao XIA, Jianhui ZHANG,

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 4, Pages 420-429 doi: 10.1007/s11465-009-0052-7

Abstract: According to the present classification method for a piezoelectric pump, this paper reviews the developmentand present situation of piezoelectric pumps in the latest 30 years and finally puts forward a new classification

Keywords： piezoelectric pump development and present situation new classification method valveless piezoelectric

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The present and future of low permeability oil and gas in China

Hu Wenrui

Strategic Study of CAE 2009, Volume 11, Issue 8, Pages 29-37

Abstract:

Low permeability oil and gas resource of China is abundant and has a great potential of exploration and development. Great exploration discoveries in low permeability sandstone, marine carbonate and volcanic rock fields were acquired and top international matching development technology in low permeability was created. Scale effective development in low permeability oil and gas reservoir was achieved. Oil and gas production in low permeability reservoir increased continuously and the proportion in production components is increasing yearly. New proved reserves and remaining oil and gas reserves considered, low permeability oil and gas resource is the main objects of exploration and development in future. Low permeability resources are the mainstream of exploration and development in China oil and gas industry and have an immense strategic importance for nation energy security.

Keywords： low permeability oil and gas exploration and development mainstream present and future technology

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Major bridge development in Hong Kong, China—past, present and future

Michael CH HUI, Doris YAU

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 4, Pages 405-414 doi: 10.1007/s11709-011-0136-4

Abstract: The first “modern” type of vehicular bridge was built in Hong Kong China in the 1920s. The need for an efficient transportation system to cope with population growth and enable economic development has demanded the construction of more and more bridges since the middle of the 20th century. By 2007, Hong Kong had a total of about 1300 vehicular bridges. Four of these bridges, including the Tsing Ma Bridge, Kap Shui Mun Bridge, Ting Kau Bridge, and the cable-stayed bridge on the Hong Kong- Shenzhen Western Corridor, are considered to be major bridges supported by cables. Currently, the Stonecutters Bridge on Route No. 8 is under construction and is expected to be completed in late 2009. At the same time, the Hong Kong-Zhuhai-Macao Bridge will be in its detailed design stage soon. While efforts have been made by bridge builders to construct these giant structures, the upkeeping of these valuable assets at a high standard and ensuring their continuous functioning and performance during their intended lifespans will be another important task for bridge engineers. Wind and structural health monitoring system (WASHMS) will play a key role in this respect.

Keywords： Tsing Ma Bridge Kap Shui Mun Bridge Ting Kau Bridge Stonecutters Bridge Hong Kong-Zhuhai-Macao Bridge wind and structural health monitoring system (WASHMS)

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Present state and development trend of exploration

Feng Zhiqiang,Jin Chengzhi,Liang Jiangping,Zhao Bo

Strategic Study of CAE 2010, Volume 12, Issue 5, Pages 58-63

Abstract:

Aiming at the 3 types of exploration problem in Daqing Oilfield (oil of shallow and middle layers in the northern Songliao Basin, natural gas of deep layers in the northern of Songliao Basin, oil and gas of complex fault depression—Hailaer Basin and Yi-Shu graben etc., unconventional resources and oversea oil and gas), high-resolution 3D seismic exploration technology of lithologic reservoir, 3D seismic exploration technology of deep volcanic rock, 3D seismic exploration technology of complex fault depression, reservoir evaluation and reformation technology in less permeable reservoirs, volcanic rock and complex fault depression, well drilling technology of volcanic rock deep layers, have been formed through researches on seismic acquisition, processing and interpretation, logging and drilling. The series of technology provided technical supports for incremental reserves of lithologic reservoir in the northern Songliao Basin, discovery of large-scale natural gas reservoir of deep volcanic rock and the exploration breakthrough in complex fault depression.

Keywords： Daqing Oilfield present state of exploration technology developing direction

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Three-dimensional reconstruction of light microscopy image sections: present and future

Yuzhen Wang,Rui Xu,Gaoxing Luo,Jun Wu

Frontiers of Medicine 2015, Volume 9, Issue 1, Pages 30-45 doi: 10.1007/s11684-014-0337-z

Abstract:

Three-dimensional (3D) image reconstruction technologies can reveal previously hidden microstructures in human tissue. However, the lack of ideal, non-destructive cross-sectional imaging techniques is still a problem. Despite some drawbacks, histological sectioning remains one of the most powerful methods for accurate high-resolution representation of tissue structures. Computer technologies can produce 3D representations of interesting human tissue and organs that have been serial-sectioned, dyed or stained, imaged, and segmented for 3D visualization. 3D reconstruction also has great potential in the fields of tissue engineering and 3D printing. This article outlines the most common methods for 3D tissue section reconstruction. We describe the most important academic concepts in this field, and provide critical explanations and comparisons. We also note key steps in the reconstruction procedures, and highlight recent progress in the development of new reconstruction methods.

Keywords： microtomy 3D imaging computer-assisted image processing 3D printing tissue scaffold