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| 1 | Structure Analysis of Locking Mechanism of Gear-Rack Typed Ship-Lift显示文摘Contact nonlinear theory was researched. Contact problem was transformed into optimization problem containing Lagrange multiplier, and unsymmetrical stiffness matrix was transformed into symmetrical stiffness matrix. A finite element analysis (FEA) model defining more than 300 contact pairs for long nut-short screw locking mechanism of a large-scale vertical gear-rack typed ship-lift was built. Using augmented Lagrange method and symmetry algorithm of contact element stiffness, the FEA model was analyzed, and the contact stress of contact interfaces and the von Mises stress of key parts were obtained. The results show that the design of the locking mechanism meets the requirement of engineering, and this method is effective for solving large scale nonlinear contact pairs. | SHI Duanwei WU Qingming ZHANG Zhiqiang | 2006 | Wuhan University Journal of Natural Sciences2006，11，3： | 6 |
| 2 | Study of high pressure sintering behavior of CBN composites starting with CBN-Al mixtures显示文摘Cubic boron nitride(CBN) composites starting with CBN-Al mixtures were sintered on WC-16 wt%Co substrate under static high pressure of 5.0 GPa at temperatures of 800 to 1 400℃for 30 min.Vickers hardness of the sintered samples increased with increasing CBN content and the highest hardness of 32.7 GPa was achieved for the CBN-5 wt%Al specimens sintered at 1 400℃.The reactions between CBN and Al started to occur at about 900℃and the reaction products strongly depended on the Al content,sintering temperature and Co diffused from the substrates according to the x-ray diffraction(XRD) observations.The CBN composite sintered at 1 200℃from a CBN-15 wt%Al mixture showed the best cutting performance. | Li Yongjun Li Sicheng Lv Ran Qin Jiaqian Zhang Jian Wang Jianghua Wang Fulong Kou Zili He Duanwei (Institute of Atomic and Molecular Physics,Sichuan University,Chengdu 610065,China) | 2008 | 金刚石与磨料磨具工程2008，28，S1： | 3 |
| 3 | Nano-polycrystalline diamond formation under ultra-high pressure显示文摘 | Chao Xu Duanwei He Haikuo Wang Junwei Guan Chunmei Liu Fang Peng Wendan Wang Zili Kou Kai He Xiaozhi Yan Yan Bi Lei Liu Fengjiao Li Bo Hui | 2013 | International Journal of Refractory Metals and Hard Materials2013，，： | 2 |
| 4 | Safety Analysis for Thread Pair Clearance of Safety Mechanism of Three Gorges Project Ship Lift显示文摘The Three Gorges Project(TGP) ship lift employs 4 safety mechanisms, of which one consists of a rotary locking screw and a nut jaw column. The thread pair clearance(TPC) of safety mechanisms is set at 60 mm. Owing to influential factors,the TPC changes randomly in the upward/downward-stroke of the ship chamber. If it diminished to 0, the safety mechanism would be jammed, thus resulting in disastrous accidents. By the bearing test of the drive system, 7 influential factors have been studied; 15 other influential factors(including 8 factors of manufacture and installation deviation, 3 factors of chamber offset, 2 factors of external load and 2 factors of wear) have been analyzed based on the design data. Results by the limit superposition reveal that the TPC change varies from -43.8 mm to +48.4 mm when the water level of the chamber ranges from 3.4 m to 3.6 m. According to the Gaussian distribution, the probability of the TPC change varied from -53.7 mm to +58.8 mm in the most detrimental status is99.74%, therefore, the TPC remains in a safe condition. This paper puts forward that two-phase operation of the drive system should be adopted so as to reduce the maximum TPC change to -44.6 mm. | SHI Duanwei CHENG Shuxiao ZHAO Tiezhu PENG Hui WANG Yongbo | 2014 | Wuhan University Journal of Natural Sciences2014，19，6： | 2 |
| 5 | Synthesis of novel superhard materials under ultrahigh pressure显示文摘Superhard materials are solids whose Vickers hardness is beyond 40 GPa. They have wide applications in industry such as cutting and polishing tools, wear-resistant coatings. Most preparations of superhard materials are conducted under extreme pressure and temperature conditions, not only for scientific investigations, but also for the practical applications. In this paper, we would introduce the recent progress on the design and preparations of novel superhard materials, mainly on nanopolycrystalline diamond, B–C–N superhard solid solutions, and cubic-Si3N4/diamond nanocomposites prepared under ultrahigh pressure and high temperature(HPHT), using multi-anvil apparatus based on the hinged-type cubic press. Bulk materials of all these superhard phases have been successfully synthesized and are systematically tested. We emphasize that ultra-HPHT method plays an important role in the scientific research and industrial production of superhard materials. It provides the driving forces for the light elements forming novel superhard phases as well as the way for sintering high-density nanosuperhard materials. | Chao Xu Duanwei He Haikuo Wang Wendan Wang Mingjun Tang Pei Wang | 2014 | Chinese Science Bulletin2014，59，36： | 2 |
| 6 | Compression behavior of nanocrystalline TiN显示文摘 | Qiming Wang Duanwei He Fang Peng Lun Xiong Jianghua Wang Pei Wang Chao Xu Jing Liu | 2013 | Solid State Communications2013，，： | 1 |
| 7 | Metal adsorption byquasi cellulose xanthogenates derived from aquatic and terrestrialplant materials显示文摘 | Zhou Wenbing Ge Xuan Zhu Duanwei | 2011 | Bioresource Technology2011，102，： | 1 |
| 8 | Nano-polycrystalline diamond formation under ultra-high pres- sure显示文摘 | Chao Xu Duanwei He Haikuo Wang Junwei Guan | 2013 | Journal of Refractory Metals and Hard Materials2013，36，2013： | 1 |
| 9 | An Algorithm to Recognize the Target Object Contour Based on 2D Point Clouds by Laser-CCD-Scanning显示文摘For a vision measurement system consisted of laser-CCD scanning sensors, an algorithm is proposed to extract and recognize the target object contour. Firstly, the two-dimensional(2D) point cloud that is output by the integrated laser sensor is transformed into a binary image. Secondly, the potential target object contours are segmented and extracted based on the connected domain labeling and adaptive corner detection. Then, the target object contour is recognized by improved Hu invariant moments and BP neural network classifier. Finally, we extract the point data of the target object contour through the reverse transformation from a binary image to a 2D point cloud. The experimental results show that the average recognition rate is 98.5% and the average recognition time is 0.18 s per frame. This algorithm realizes the real-time tracking of the target object in the complex background and the condition of multi-moving objects. | MAO Hongyong SHI Duanwei ZHOU Ji XU Pan CHEN Shiyu XU Yuxiang FENG Fan | 2015 | Wuhan University Journal of Natural Sciences2015，20，4： | 1 |
| 10 | Effect of preeompression on pressure-transmitting efficiency of pyrophyllite gaskets 显示文摘 | Leiming Fang Duanwei He Chao Chen | 2007 | High Pressure Res2007，27，3： | 1 |
| 11 | Structure and dynamics of hydrogen molecules in the novel clathrate hydrate by high pressure neutron diffrac- tion 显示文摘 | LOKSHIN K A ZHAO YUSHENG HE DUANWEI | 2004 | Physical Review Letters2004，93，12： | 1 |
| 12 | Quantitative measurements of pressure gradients for the pyrophyllite and magnesium oxide pressure-transmitting mediums to 8?GPa in a large-volume cubic cell显示文摘 | Haikuo Wang Duanwei He Xiaozhi Yan Chao Xu Junwei Guan Ning Tan Wendan Wang | 2011 | High Pressure Research2011，，4： | 1 |
| 13 | Synthesis of Stoichiometric and Bulk CrN through a Solid‐State Ion‐Exchange Reaction显示文摘 | Miao Chen Shanmin Wang Jianzhong Zhang Duanwei He Yusheng Zhao | 2012 | Chem. Eur. J2012，，48： | 1 |
| 14 | Superhard composites of cubic silicon nitride and diamond显示文摘 | Wendan Wang Duanwei He Mingjun Tang Fengjiao Li Lei Liu Yan Bi | 2012 | Diamond & Related Materials2012，，： | 1 |
| 15 | A large volume cubic press with a pressure-generating capability up to about 10?GPa显示文摘 | Xi Liu Jinlan Chen Junjie Tang Qiang He Sicheng Li Fang Peng Duanwei He Lifei Zhang Yingwei Fei | 2012 | High Pressure Research2012，，2： | 1 |
| 16 | Pressure-induced crystallization in a bulk amorphous Zr-based alloy显示文摘 | Duanwei He Q Zhao W.H Wang R.Z Che J Liu X.J Luo W.K Wang | 2002 | Journal of Non-Crystalline Solids2002，，1： | 1 |
| 17 | Comparative metabolic activity related to flavonoid synthesis in leaves and flowers of Chrysanthemum morifolium in response to K deficiency显示文摘 | Wei Liu Duanwei Zhu Dahui Liu Xiao Lu Mingjian Geng | 2010 | Plant and Soil2010，，1： | 1 |
| 18 | Is the hardness of material harder than diamond reliable?显示文摘With the development of new synthesis methods and chemistries,a number of new superhard materials have been reported to be harder than diamond.While such materials are highly desirable due to their wide-ranging applications,there are some inherent uncertainties in the methods utilized to determine and define the hardness of such materials.In this paper,we employed the standard Vickers diamond indenter and substitute indenters with the same shape to measure the hardness of nine ceramics and superhard materials within well-defined criteria and methodology,for the assessment of consistency in the hardness testing.The findings and the developed testing method in the current study have broad implications in characterizing new and emerging superhard materials,leading to new discoveries. | Jin Liu Yongtao Zou Guodong David Zhan Pei Wang Xiaozhi Yan Duanwei He Liping Wang | 2023 | Journal of Materials Science & Technology2023，，13： | 0 |
| 19 | Collisions between Hydrogen Molecular Ions and Nitrogen Molecules in eV Energy Range显示文摘The reaction rate coefficient for collision between hydrogen molecular ions and nitrogen molecules has been measured by using ion storage technique.The results are total rate coefficient k=5.68×10^(-9)cm^(3)/s and rate coefficients kpt=5.23×10^(-9)cm^(3)/s for proton transfer and kct=4.5×10^(-10)cm^(3)/s for charge transfer. | WANG Duanwei QIAN Huixian | 1991 | Chinese Physics Letters1991，8，2： | 0 |
| 20 | Strength enhancement of nanocrystalline tungsten under high pressure显示文摘Three tungsten powder samples—one coarse grained(c-W;grain size:1μm–3μm)and two nanocrystalline(n-W;average grain sizes:10nm and 50 nm)—are investigated under nonhydrostatic compression in a diamond anvil cell in separate experiments,and their in situ X-ray diffraction patterns are recorded.The maximum microscopic deviatoric stress in each tungsten sample,a measure of the yield strength,is determined by analyzing the diffraction line width.Over the entire pressure range,the strength of tungsten increases noticeably as the grain size is decreased from 1μm–3μmto 10 nm.The results show that the yield strength of tungsten with an average crystal size of 10nmis around 3.5 times that of the sample with a grain size of 1μm–3μm. | Jing Yang Wen Deng Qiang Li Xin Li Akun Liang Yuzhu Su Shixue Guan Junpu Wang Duanwei He | 2020 | Matter and Radiation at Extremes2020，5，5： | 0 |
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