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| 1 | An improved process for grain refinement of large 2219 Al alloy rings and its influence on mechanical properties显示文摘The large 2219 Al alloy rings used to connect propellant tank components of a satellite launch vehicle to each other are conventionally manufactured by radial-axial ring rolling at 460°C with 50% deformation,but often suffer from coarse elongated grain and low ductility. An improved process(hot ring rolling at460°C with 30% deformation, then air cooling to 240°C, followed by ring rolling at 240°C with 20% deformation) was tested for ring manufacturing. The corresponding microstructure evolution and mechanical properties of the produced rings were studied. The results show that the improved process can successfully be applied to manufacture the large 2219 Al alloy rings without formation of macroscopic defects,resulting in a product with fine and uniform grains after heat treatment. The fracture mechanism of both rings was mainly intergranular fracture. With the resulting grain size refinement due to the improved process, more homogeneous slip occured and the crack propagation path became more tortuous during the tensile testing process. Thus, the elongation in all three orthogonal directions was greatly improved,and the axial elongation increased from 3.5% to 10.0%. | Hailin He Youping Yi Shiquan Huang Yuxun Zhang | 2019 | Journal of Materials Science & Technology2019，35，1： | 9 |
| 2 | Gas–solid interface charge characterisation techniques for HVDC GIS/GIL insulators显示文摘Surface charge accumulation on the spacers is one of the key issues restraining the development of HVDC GIS/GIL.The precise measurement of surface charge properties provides the basis for further study of the surface charge transport mechanism as well as the charge-induced flashover mechanism under DC voltage.In this study,the authors discuss their perspective on the current status,development needs and potential developing orientation of surface charge characterisation techniques.Different surface potential measurement methods and charge inversion algorithms are reviewed regarding the previous studies and future research needs.Drawbacks and outlooks of surface charge measurement techniques are also discussed with the background of laboratory experiment results and on-site measurements.It is hopefully that this study can serve as a useful guide reference for researchers within the same research field.More importantly,it is authors’hope that this study can inspire some novel ideas for readers into developing of more accurate and scientific interface charge characterisation techniques. | Lei Zhang Chuanjie Lin Chuanyang Li Simone Vincenzo Suraci Geng Chen Uwe Riechert Tohid Shahsavarian Masayuki Hikita Youping Tu Zhousheng Zhang Davide Fabiani Jinliang He | 2020 | High Voltage2020，5，2： | 4 |
| 3 | Rapid growth of a large-scale(600 mm aperture) KDP crystal and its optical quality显示文摘Potassium dihydrogen phosphate(KDP) single crystals are the only nonlinear crystals currently used for electro-optic switches and frequency converters in inertial confinement fusion research, due to their large dimension and exclusive physical properties. Based on the traditional solution-growth process, large bulk KDP crystals, usually with sizes up to600 × 600 mm2 so as to make a frequency doubler for the facility requirement loading highly flux of power laser, can be grown in standard Holden-type crystallizers, without spontaneous nucleation and visible defects, one to two orders of magnitude faster than by conventional methods. Pure water and KDP raw material with a few ion impurities such as Fe,Cr, and Al(less than 0.1 ppm) were used. The rapid-growth method includes extreme conditions such as temperature range from 60 to 35℃ , overcooling up to 5℃ , growth rates exceeding 10 mm/day, and crystal size up to 600 mm. The optical parameters of KDP crystals were determined. The optical properties of crystals determined indicate that they are of favorable quality for application in the facility. | Guohui Li Guozong Zheng Yingkun Qi Peixiu Yin En Tang Fei Li Jing Xu Taiming Lei Xiuqin Lin Min Zhang Junye Lu Jinbo Ma Youping He Yuangen Yao | 2014 | High Power Laser Science and Engineering2014，2，1： | 3 |
| 4 | Surface Charging Phenomena on HVDC Spacers for Compressed SF_(6) Insulation and Charge Tailoring Strategies显示文摘Surface flashover of spacers is a key factor limiting the application of HVDC GIS/GIL,while the charge accumula-tion on the surface of the spacer could have a potential adverse effect on the surface flashover voltage.This paper discusses the laws regarding distribution patterns of surface charges and the related mechanisms.The field-dependent property is discussed in detail to comprehensively illustrate the charge transport mecha-nism and explain the research differences regarding different surface charge patterns obtained by previous researchers.In addition,the main surface charge control methods for epoxy resin are summarized and discussed.The potential research directions of charge control methods and key points in manufacturing of spacers used in HVDC GIS/GIL are also explored. | Chuanyang Li Yuan Xu Chuanjie Lin Geng Chen Youping Tu Yao Zhou Zhipeng Lei Tao Han Simone Vincenzo Suraci Jian Wang Weidong Liu M.Tariq Nazir Shun He Andrea Cavallini Giovanni Mazzanti Davide Fabiani Jinliang He | 2020 | CSEE Journal of Power and Energy Systems2020，6，1： | 3 |
| 5 | TSC characteristics of AC aged ZnO varistors显示文摘The AC aging characteristics and mechanism of ZnO varistors have been widely concerned for a long time.In this paper,accelerated aging test of ZnO varistors was carried out based on the 'ten degrees and a half' rule,power loss and thermally stimulated current(TSC) of samples were tested during each aging stage.The test results show that with the increasing of aging time,the power loss increases,the trapped charges increase and the trap level becomes deeper.In addition,the increase of power loss and the increase of trapped charge with the aging time have the same trend.A preliminary analysis shows that the migration of interstitial zinc ions will change the space charge distribution and decrease the Schottky barrier height to cause the change of the trap level. | TU YouPing WANG Qian HE Jie LI Xiao DING LiJian | 2013 | Chinese Science Bulletin2013，58，7： | 2 |
| 6 | August–September Runoff Variation in the Kara Darya River Determined from Juniper(Juniperus turkestanica) Tree Rings in the Pamirs-Alai Mountains, Kyrgyzstan, Back to 1411 CE显示文摘A 606 year runoff reconstruction of the Kara Darya River was developed, based on the tree-ring width chronology of Turkestan juniper(Juniperus turkestanica) from the Pamir-Alai Mountains of Kyrgyzstan. Preliminary comparison between the snow cover variation and these climate/runoff reconstructions found that Central Asian snow cover may have strong associations with large-scale ocean-atmosphere-land circulations. The runoff reconstruction demonstrated that instrumental runoff was not representative of runoff over the past 606 years. The drought of the 1960 s-1990 s resulted in low runoff levels during the past 50 years;however, this probably does not represent a worst-case scenario for the Kara Darya because the runoff reconstruction showed additional extremely low runoff prior to the 20 th century. The reconstruction will provide a long-term perspective on runoff variation in the Kara Darya River basin, aid sustainable water resource management and be useful in guiding expectations of future variations and water resource planning. | ZHANG Heli HE Qing CHEN Feng Dogdurbek CHONTOEV Rysbek SATYLKANOV Bakytbek ERMENBAEV CHEN Youping | 2020 | Acta Geologica Sinica(English Edition)2020，94，3： | 2 |
| 7 | Laboratory investigation of impulse characteristics of transmission tower grounding devices显示文摘 | He Jinliang Zeng Rong Tu Youping | 2003 | IEEE Transactions on Power Delivery2003，18，3： | 1 |
| 8 | MSMiner- a developing platform for OLAP显示文摘 | Shi Zhongzhi Huang Youping He Qing | 2007 | Decision Support Systems2007，42，4： | 1 |
| 9 | Numeral analysis model for shielding failure of transmission line under lightning stroke显示文摘 | He Jingiang Tu Youping Zeng Rong | 2005 | IEEE Transaction on Power Delivery2005，20，2： | 1 |
| 10 | Labo- ratory investigation of impulse characteristics of transmi~ion tower grounding devices 显示文摘 | He Jinliang Zeng Rong Tu Youping | 2003 | IEEE Transaction on Power Delivery2003，18，3： | 1 |
| 11 | Numeral analysis model for shielding failure of transmission line under lightning stroke显示文摘 | He Jinliang Tu Youping Zeng Rong | 2005 | IEEE Transactions on Power Delivery2005，20，2： | 1 |
| 12 | Numeral analysis model for shielding failure of transmission line under lightning stroke显示文摘 | He Jinliang Tu Youping Zeng Rong | 2005 | IEEE Transactions on Power Delivery2005，20，2： | 1 |
| 13 | Laboratory investigation of impulse characteristics of transmission tower grounding devices显示文摘 | Jinliang He Rong Zeng Youping Tu | 2003 | IEEE Transaction on Power Delivery2003，18，3： | 1 |
| 14 | Numeral analysis model for shielding failure of transmission line under lightning stroke显示文摘 | He Jinliang Tu Youping Zeng Rong | 2005 | IEEE Transactions on Power Delivery2005，20，2： | 1 |
| 15 | Lightning Impulse Performances of Grounding Devices Covered With Low - Resistivity Materials 显示文摘 | Youping Tu Jingliang He RongZeng | 2006 | IEEE Tans on Power Delivery2006，21，3： | 1 |
| 16 | Numerical Analysis Model for Shielding Failure of Transmission Line Under Lightning Stroke显示文摘 | HE Jinliang TU Youping ZENG Rong | | 0，，02： | 1 |
| 17 | Lightning impulse performances of grounding devices covered with low resistivity materials显示文摘 | Tu Youping He Jinliang Zeng Rong | 2006 | IEEE Transactions On Power Delivery2006，21，3： | 1 |
| 18 | Laboratory investigation of impulse characteristics of transmission tower grounding devices 显示文摘 | He Jinliang Zeng Rong Tu Youping | 2003 | IEEE Transactions on Power Delivery2003，18，3： | 1 |
| 19 | Laboratory investigation of impulse characteristics of transmission tower grounding devices显示文摘 | He Jinliang Zeng Rong Tu Youping | 2003 | IEEE Transactions on Power Delivery2003，18，3： | 1 |
| 20 | Lightning impulse performances of grounding devices covered with low resistivity materials 显示文摘 | Tu Youping He Jinliang Zeng Rong | 2006 | IEEE Transactions on Power Delivery2006，21，3： | 1 |
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