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| 1 | Influence Analysis of Secondary O-ring Seals in Dynamic Behavior of Spiral Groove Gas Face Seals显示文摘The current research on secondary O-ring seals used in mechanical seals has begun to focus on their dynamic properties. However, detailed analysis of the dynamic properties of O-ring seals in spiral groove gas face seals is lacking. In particular a transient study and a difference analysis of steady-state and transient performance are imperative. In this paper, a case study is performed to gauge the effect of secondary O-ring seals on the dynamic behavior(steady-state performance and transient performance) of face seals. A numerical finite element method(FEM) model is developed for the dynamic analysis of spiral groove gas face seals with a flexibly mounted stator in the axial and angular modes. The rotor tilt angle, static stator tilt angle and O-ring damping are selected to investigate the effect of O-ring seals on face seals during stable running operation. The results show that the angular factor can be ignored to save time in the simulation under small damping or undamped conditions. However, large O-ring damping has an enormous effect on the angular phase difference of mated rings, affecting the steady-state performance of face seals and largely increasing the possibility of face contact that reduces the service life of face seals. A pressure drop fluctuation is carried out to analyze the effect of O-ring seals on the transient performance of face seals. The results show that face seals could remain stable without support stiffness and O-ring damping during normal stable operation but may enter a large-leakage state when confronting instantaneous fluctuations. The oscillation-amplitude shortening effect of O-ring damping on the axial mode is much greater than that on the angular modes and O-ring damping prefers to cater for axial motion at the cost of angular motion. This research proposes a detailed dynamic-property study of O-ring seals in spiral groove gas face seals, to assist in the design of face seals. | HU Songtao HUANG Weifeng LIU Xiangfeng WANG Yuming | 2016 | Chinese Journal of Mechanical Engineering2016，29，3： | 14 |
| 2 | A retrospective comparison of the modified tension band technique and the parallel titanium cannulated lag screw technique in transverse patella fracture显示文摘 | Wang Chengxue Tan Lei Qi Baochang Hou Xiangfeng Huang Yulong Zhang Haipeng Yu Tiecheng | 2014 | Chinese Journal of Traumatology2014，17，4： | 14 |
| 3 | Three-dimensional graphene framework with ultra-high sulfur content for a robust lithium-sulfur battery显示文摘 | Benjamin Papandrea Xu Xu Yuxi Xu Chih-Yen Chen Zhaoyang Lin Gongming Wang Yanzhu Luo Matthew Liu yu Huang Liqiang Mai Xiangfeng Duan | 2016 | Nano Research2016，9，1： | 13 |
| 4 | Thermal Fluid-Solid Interaction Model and Experimental Validation for Hydrostatic Mechanical Face Seals显示文摘Hydrostatic mechanical face seals for reactor coolant pumps are very important for the safety and reliability of pressurized-water reactor power plants.More accurate models on the operating mechanism of the seals are needed to help improve their performance.The thermal fluid–solid interaction(TFSI)mechanism of the hydrostatic seal is investigated in this study.Numerical models of the flow field and seal assembly are developed.Based on the mechanism for the continuity condition of the physical quantities at the fluid–solid interface,an on-line numerical TFSI model for the hydrostatic mechanical seal is proposed using an iterative coupling method.Dynamic mesh technology is adopted to adapt to the changing boundary shape.Experiments were performed on a test rig using a full-size test seal to obtain the leakage rate as a function of the differential pressure.The effectiveness and accuracy of the TFSI model were verified by comparing the simulation results and experimental data.Using the TFSI model,the behavior of the seal is presented,including mechanical and thermal deformation,and the temperature field.The influences of the rotating speed and differential pressure of the sealing device on the temperature field,which occur widely in the actual use of the seal,are studied.This research proposes an on-line and assembly-based TFSI model for hydrostatic mechanical face seals,and the model is validated by full-sized experiments. | HUANG Weifeng LIAO Chuanjun LIU Xiangfeng SUO Shuangfu LIU Ying WANG Yuming | 2014 | Chinese Journal of Mechanical Engineering2014，27，5： | 10 |
| 5 | Fluid-solid strong-interaction model of mechanical seals in reactor coolant pumps显示文摘The studies on the mechanisms and performances of the mechanical seals in reactor coolant pumps are very important for the safe operations of the pressurized water reactor power plants.Based on the hydrostatic mechanical seal in reactor coolant pumps,an analytical fluid-solid strong-interaction model is proposed in this paper.According to the design features and operational principles of the seal,an analytical method to calculate the mechanical deformation of the seal assembly is developed based on the ring deformation theory.A strong-interaction algorithm combining the analysis of the mechanical deformation of the seal assembly and flow field between the seal faceplates is utilized,in which the three kinds of equations including the fluid domain,solid domain and coupling action are constituted in the same equations set and all the variables are solved simultaneously.So the analytical fluid-solid strong-interaction model used for the seal is built.Moreover,the model is verified by the experimental results.Based on the model,the design parameters of the seal are studied.Two different conditions of the general case and fixed seal leakage rate are discussed respectively,and the regularities that the seal behaviors are affected by the parameters of the holding screws on the clamp rings and seal faceplates are obtained.The research results can provide a theoretical basis for performance analysis,design and assemblage of the seal.Compared to the numerical methods,the proposed model has the unique advantages of high efficiency,convenience and easy application of constraints. | LIAO ChuanJun HUANG WeiFeng SUO ShuangFu LIU XiangFeng WANG YuMing | 2011 | Science China(Technological Sciences)2011，54，9： | 9 |
| 6 | A mass-conservative average flow model based on finite element method for complex textured surfaces显示文摘A mass-conservative average flow model based on the finite element method(FEM) is introduced to predict the performances of textured surfaces applied in mechanical seals or thrust bearings.In this model,the Jakobsson-Floberg-Olsson(JFO) boundary conditions are applied to the average flow model for ensuring the mass-conservative law.Moreover,the non-uniform triangular grid is utilized,which can deal with the problem of complex geometric shapes.By adopting the modeling techniques,the model proposed here is capable of dealing with complex textured surfaces.The algorithm is proved correct by the numerical experiment.In addition,the model is employed to gain further insight into the influences of the dimples with different shapes and orientations on smooth and rough surfaces on the load-carrying capacity. | XIE Yi LI YongJian SUO ShuangFu LIU XiangFeng LI JingHao WANG YuMing | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，10： | 8 |
| 7 | Chemical vapor deposition growth of single-crystalline cesium lead halide microplatelets and heterostructures for optoelectronic applications显示文摘Organic-inorganic hybrid halide perovskites, such as CH3NH3PbI3, have emerged as an exciting class of materials for solar photovoltaic applications; however, they are currently plagued by insufficient environmental stability. To solve this issue, all-inorganic halide perovskites have been developed and shown to exhibit significantly improved stability. Here, we report a single-step chemical vapor deposition growth of cesium lead halide (CsPbX3) microcrystals. Optical microscopy studies show that the resulting perovskite crystals predominantly adopt a square-platelet morphology. Powder X-ray diffraction (PXRD) studies of the resulting crystals demonstrate a highly crystalline nature, with CsPbCl3, CsPbBr3, and CsPbI3 showing tetragonal, monoclinic, and orthorhombic phases, respectively. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) studies show that the resulting platelets exhibit well-faceted structures with lateral dimensions of the order of 10-50 μm, thickness around 1 μm, and ultra-smooth surface, suggesting the absence of obvious grain boundaries and the single-crystalline nature of the individual microplatelets. Photoluminescence (PL) images and spectroscopic studies show a uniform and intense emission consistent with the expected band edge transition. Additionally, PL images show brighter emission around the edge of the platelets, demonstrating a wave-guiding effect in high-quality crystals. With a well-defined geometry and ultra-smooth surface, the square platelet structure can function as a whispering gallery mode cavity with a quality factor up to 2,863 to support laser emission at room temperature. Finally, we demonstrate that such microplatelets can be readily grown on a variety of substrates, including silicon, graphene, and other two-dimensional materials such as molybdenum disulfide, which can readily allow the construction of heterostructure optoelectronic devices, including a graphene/perovskite/graphene vertically-stacked photodetector with photoresponsivity > 105 A/W. The extraordinary optical properties of CsPbX3 platelets, combined with their ability to be grown on diverse materials to form functional heterostructures, can lead to exciting opportunities for broad optoelectronic applications. | Yiliu Wang Xun Guan Dehui Li Hung-Chieh Cheng Xidong Duan Zhaoyang Lin Xiangfeng Duan | 2017 | Nano Research2017，10，4： | 8 |
| 8 | Developmental changes in intercellular junctions and Kv channels in the intestine of piglets during the suckling and post-weaning periods显示文摘Background: The intestinal epithelium is an important barrier that depends on a complex mixture of proteins and these proteins comprise different intercellular junctions. The purpose of this study was to investigate the postnatal and developmental changes in morphology, intercellular junctions and voltage-gated potassium(Kv) channels in the intestine of piglets during the suckling and post-weaning periods.Results: Samples of the small intestine were obtained from 1-, 7-, 14-, and 21-d-old suckling piglets and piglets on d 1, 3, 5, and 7 after weaning at 14 d of age. The results showed that the percentage of proliferating cell nuclear antigen(PCNA)-positive cells and alkaline phosphatase(AKP) activity, as well as the abundances of E-cadherin,occludin, and Kv1.5 m RNA and claudin-1, claudin-3, and occludin protein in the jejunum were increased from d 1to d 21 during the suckling period(P < 0.05). Weaning induced decreases in the percentage of PCNA-positive cells,AKP activity and the abundances of E-cadherin, occludin and zonula occludens(ZO)-1 m RNA or protein in the jejunum on d 1, 3 and 5 post-weaning(P < 0.05). There were lower abundances of E-cadherin, occludin and ZO-1m RNA as well as claudin-1, claudin-3 and ZO-1 protein in the jejunum of weanling piglets than in 21-d-old suckling piglets(P < 0.05). The abundances of E-cadherin, occludin, ZO-1 and integrin m RNA were positively related to the percentage of PCNA-positive cells.Conclusion: Weaning at 14 d of age induced damage to the intestinal morphology and barrier. While there was an adaptive restoration on d 7 post-weaning, the measured values did not return to the pre-weaning levels, which reflected the impairment of intercellular junctions and Kv channels. | Jing Wang Liming Zeng Bie Tan Guangran Li Bo Huang Xia Xiong Fengna Li Xiangfeng Kong Gang Liu Yulong Yin | 2016 | Journal of Animal Science and Biotechnology2016，7，2： | 8 |
| 9 | Fruit and vegetable consumption,cardiovascular disease,and all-cause mortality in China显示文摘Evidence about the response patterns of fruit and vegetable consumption with the risk of cardiovascular disease(CVD)and allcause mortality was inconsistent.These associations were examined using a large-scale,population-based Chinese cohort comprising 100,728 participants.A food-frequency questionnaire was used to assess fruit and vegetable consumption.Outcomes were ascertained by interviewing individuals or their proxies and checking hospital records or death certificates.Cox proportional hazards regression was used to calculate hazard ratios(HRs)with 95% confidence intervals(CIs).At the 736,668 person-years of follow-up,3,677 CVD cases and 5,466 deaths were identified.The multivariable-adjusted HRs for CVD across increasing quartiles of total fruit and vegetable consumption were 1(reference),0.94(95%CI=0.85-1.04),0.89(95%CI=0.80-0.98),and 0.85(95%CI=0.77-0.95).Moreover,participants in the highest quartile displayed a 13% lower risk of all-cause mortality(HR=0.87;95%CI=0.80-0.95).A nonlinear dose-response relation was found for CVD,without additional benefits beyond a consumption of600 g d-1,whereas the all-cause mortality risk decreased along with higher consumption,with a linear trend.These associations remained significant for fruit consumption but not for vegetable consumption.Our findings indicated that greater fruit and vegetable consumption was significantly associated with a lower risk of CVD and all-cause mortality.Increasing fruit and vegetable consumption,especially fruit,in the general population would prevent CVD and premature mortality. | Jun Wang Fangchao Liu Jianxin Li Keyong Huang Xueli Yang Jichun Chen Xiaoqing Liu Jie Cao Shufeng Chen Chong Shen Ling Yu Fanghong Lu Xianping Wu Liancheng Zhao Ying Li Dongsheng Hu Jianfeng Huang Dongfeng Gu Xiangfeng Lu | 2022 | Science China(Life Sciences)2022，65，1： | 8 |
| 10 | Friction Characteristics of Impregnated and Non-Impregnated Graphite against Cemented Carbide under Water Lubrication显示文摘The friction behavior of resin-impregnated and non-impregnated graphite sliding against a cemented carbide in dry, oil, and water environments using a ring–ring configuration was investigated. Friction coefficients were recorded at various speeds. The results showed that the impregnated graphite exhibited much better friction properties under water or oil lubrication than non-impregnated graphite, and the impregnated graphite could remain in the stable friction regime under high pressure × velocity(pv).Based on scanning electron microscopy and Raman spectroscopy analyses, the different characteristics between impregnated and non-impregnated graphite were able to be attributed to the structure of the graphite and wettability of the lubricants. | Gaolong Zhang Ying Liu Fei Guo Xiangfeng Liu Yuming Wang | 2017 | Journal of Materials Science & Technology2017，33，10： | 8 |
| 11 | Adsorption behaviors of Cd^(2+) on Fe_2O_3/MnO_2 and the effects of coexisting ions under alkaline conditions显示文摘This study describes the adsorption features of cadmium on Fe2O3 and MnO2 in alkaline saline conditions. The adsorption reached equilibrium in 6 hours under alkaline conditions. The absorption of cadmium on Fe2O3 and MnO2 was consistent with Freundlich absorption isotherms, and the corresponding adsorption capacities were 16.3 and 16.7 mg·g-1, respectively. Moreover, the adsorption quantity of cadmium on Fe2O3 and MnO2 rose with increas-ing pH from acidic to neutral, and reached the maximum at pH= 9. The coexisting chlorides reduced the adsorption capacity of Fe2O3 and MnO2. The influence intensities of different cations follow the order of CaCl2>>KCl>NaCl. However, the influence of sodium salts on the capacities of Fe2O3 and MnO2 to adsorb cadmium appeared more complicated: the relatively low concentrations of sodium salts could reduce the adsorption capacity; with increasing concentrations of sodium salts, e.g. NaCl and NaNO3. the adsorption capacity decreased continually. Moreover, due to the competition adsorption and precipitation effects, the adsorption capabilities of Na2CO3, NaH2PO4 and Na2HSO4 could also be reduced and cadmium concentrations in the solution were reduced as well. | WANG Zuwei ZENG Xiangfeng YU Xiaoman ZHANG Hui LI Zhaojiang JIN Di | 2010 | Chinese Journal Of Geochemistry2010，29，2： | 6 |
| 12 | An experimental investigation of tribological performance of triangular textures in water lubrication regime显示文摘Surface texturing has been considered as an effective approach to improve the tribological performances.Based on the consideration of enhancing the tribological performance,the experiments are carried out to investigate tribological performance of triangular textures in water lubrication.The textures are generated by the Nd:YAG laser marking system,with an area density of 20%and a depth of 7 m and are distributed uniformly on the surface of the SiC rings.Compared with the circular textures,the triangular textures have obvious tribological anisotropy.The triangular textures in clockwise direction show the best friction reduction effect among the three textures.The friction reduction mechanisms of the triangular textures in clockwise direction are also analyzed and discussed. | XIE Yi LI YongJian WANG YuMing SUO ShuangFu LIU XiangFeng | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，2： | 6 |
| 13 | A Local Cluster of Omicron Variant COVID-19 Likely Caused by Internationally Mailed Document——Beijing Municipality,China,January 2022显示文摘On January 15,2022,a 26 years old female(Case A)went to a sampling site for coronavirus disease 2019(COVID-19)testing due to excessive fatigue and fever for two days.This patient preliminarily tested positive for severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)using a quantitative real-time reverse transcription polymerase chain reaction(qRT-PCR)method. | Daitao Zhang Shuangsheng Wu Zhenyong Ren Ying Sun Xiangfeng Dou Zhaomin Feng Fu Li Yi Tian Shujuan Cui Baiwei Liu Bing Lyu Xiaoli Wang Feng Liu Lina Jin Chu Jiang Lina Tian Zhenjiang Xin Zhichao Liang Lei Jia Quanyi Wang Yang Pan Peng Yang | 2022 | China CDC weekly2022，4，14： | 6 |
| 14 | Wear behavior of WC-Ni sliding against graphite under water lubrication显示文摘Wear of hard materials in contact with softer materials is a neglected area of research. However, we observed considerable wear phenomenon at a hard WC-Ni surface sliding over soft graphite under water lubrication. The influences of applied load and the application history on the wear of surface were addressed in our experimental design. Wear of both graphite and WC-Ni surfaces increased with a greater applied load and repeated sliding. The topographies of the worn surfaces showed clear micro-scratches on the hard WC-Ni surface. Scanning electron microscopy and X-ray photoelectron spectroscopy analyses revealed that the abrasive wear of the WC-Ni surface could be attributed to hard WC particles embedded in the graphite surface. These hard particles were formed by shearing of sharp WC-Ni asperities under certain conditions and intrinsic defects of the WC-Ni surface could accelerate this wear process. | Gaolong Zhang Ying Liu Yuechang Wang Fei Guo Xiangfeng Liu Yuming Wang | 2017 | Journal of Materials Science & Technology2017，33，11： | 5 |
| 15 | Research progress on hydrothermal dissolution and hydrolysis of lignocellulose and lignocellulosic waste显示文摘 | Yan ZHAO Wenjing LU Jiajun CHEN Xiangfeng ZHANG Hongtao WANG | 2014 | Frontiers of Environmental Science & Engineering2014，8，2： | 5 |
| 16 | Retrofit design of composite cooling structure of a turbine blade by fluid networks and conjugate heat transfer methods显示文摘This article discusses the development of the numerical methods of gas flow coupled with heat transfer,and introduces the fluid net-works method for rapid prediction of the performance of the composite cooling structures in turbine blade.The reliability of these methods is verified by comparing experimental data.For a HPT rotor blade,a rapid prediction on the internal cooling structures is first made by using the fluid network analysis,then an assessment of aerodynamic and heat transfer characteristics is conducted.Based on the network analysis results,three ways to improve the design of the cooling structures are tested,i.e.,adjusting the cooling gas flow mass ratios for different inner cooling cavities,reducing the flow resistances of the channel turning structures,and improving the local internal cooling structure geometries with high temperature distribution.Through the verification of full three-dimensional gas/solid/coolant conjugate heat transfer calculation,we conclude that the modified design can make the overall temperature distribution more even by significantly reducing the highest temperature of the blade surface,and reasonably matching the parameters of different coolant inlets.The results show that the proposed calculation methods can remarkably reduce the design cycle of complex turbine blade cooling structure. | YAN PeiGang SHI Liang WANG XiangFeng HAN WanJin | 2013 | Science China(Technological Sciences)2013，56，12： | 5 |
| 17 | Recombinant osteopontin attenuates hyperoxia-induced acute lung injury through inhibiting nuclear factor kappa B and matrix metalloproteinases 2 and 9显示文摘 | Zhang Xiangfeng Liu Fen Zhu Guangfa Wang Zengzhi | 2014 | Chinese Medical Journal2014，，23： | 4 |
| 18 | Reduced graphene oxide/silicon nanowire hetero- structures with enhanced photoactivity and superior photoelectrochemical stability显示文摘Silicon nanowires (SiNWs) have been widely studied as light harvesting antennas in photocatalysts due to their ability to absorb broad-spectrum solar radiation, but they are typically limited by poor photoelectrochemical stability. Here, we report the synthesis of reduced graphene oxide-SiNW (rGO-SiNW) heterostructures to achieve greatly improved photocatalytic activity and stability. The SiNWs were synthesized through a metal-assisted electroless etching process and functionalized with reduced graphene oxide (rGO) flakes through a chemical absorption process. Here, the rGO not only functions as a physical protection layer to isolate the SiNWs from the harsh electrochemical environment but also serves as a charge mediator to facilitate the charge separation and transport processes. Furthermore, the rGO may also function as a redox catalyst to ensure efficient utilization of photo-carriers for the desired chemical reactions. Photocatalytic dye degradation studies show that the photoactivity of the heterostructures can be significantly enhanced with an initial activation process and maintained without apparent decay over repeated reaction cycles. Electrochemical and photo- electrochemical studies indicate that the enhanced photoactivity and photostability can be attributed to the more efficient separation of photoexcited charge carriers in SiNWs and the reduced self-oxidation of the surface of the SiNWs during the photocatalytic dye degradation process. The ability to significantly improve the photocatalytic activity and stability in rGO-SiNW heterostructures can not only lead to more opportunities for the application of silicon-based photocatalysts/ photoelectrodes for solar energy harvesting but also provide new insights into the stabilization of other unstable photocatalytic | Xing Zhong Gongming wang Benjamin Papandrea Mufan Li Yuxi Xu Yu Chen Chih-Yen Chen Hailong Zhou Teng Xue Yongjia Li Dehui Li Yu Huang Xiangfeng Duan | 2015 | Nano Research2015，8，9： | 4 |
| 19 | Highly-anisotropic optical and electrical properties in layered SnSe显示文摘因为他们极化依赖者或方向依赖者的唯一的联合,各向异性的材料具有可观的兴趣电、光、热电的性质。低对称二维(2D ) covalently 结合的原子层叠的货车 der Waals 形成的材料内在地是各向异性的。分层的 SnSe 展出格子对称的低度,与弄歪的 NaCl 结构和在里面飞机 anisotropy。这里,我们报导在里面飞机的系统的研究在分层的 SnSe 的各向异性的性质用散布的解决角度的拉曼,光吸收,和电的运输学习。光、电的描述是方向依赖者,并且成功地在分层的 SnSe 识别了水晶的取向。而且, SnSe 薄片厚度和刺激波长上的 Raman 紧张 anisotropy 的依赖被实验和理论计算调查。最后,电的运输研究证明很少层 SnSe 地效果晶体管(联邦货物税) 有在扶手椅和之字形方向之间的搬运人活动性(5.8 ) 的大各向异性的比率,它是高价值为 2D 报导了的一个记录各向异性的材料。分层的 SnSe 的高度各向异性的性质在新窗户中为各向异性的光学,电子学,和 optoelectronics.Open | Shengxue Yang Yuan Liu Minghui Wu Li-Dong Zhao Zhaoyang Lin Hung-chieh Cheng Yiliu Wang Chengbao Jiang Su-Huai Wei Li Huang Yu Huang Xiangfeng Duan | 2018 | Nano Research2018，11，1： | 4 |
| 20 | A Silicon Monoxide Lithium-Ion Battery Anode with Ultrahigh Areal Capacity显示文摘Silicon monoxide(SiO)is an attractive anode material for next-generation lithium-ion batteries for its ultra-high theoretical capacity of 2680 mAh g−1.The studies to date have been limited to electrodes with a rela-tively low mass loading(<3.5 mg cm^(−2)),which has seriously restricted the areal capacity and its potential in practical devices.Maximizing areal capacity with such high-capacity materials is critical for capitalizing their potential in practi-cal technologies.Herein,we report a monolithic three-dimensional(3D)large-sheet holey gra-phene framework/SiO(LHGF/SiO)composite for high-mass-loading electrode.By specifically using large-sheet holey graphene building blocks,we construct LHGF with super-elasticity and exceptional mechanical robustness,which is essential for accommodating the large volume change of SiO and ensuring the structure integrity even at ultrahigh mass loading.Additionally,the 3D porous graphene network structure in LHGF ensures excellent electron and ion transport.By systematically tailoring microstructure design,we show the LHGF/SiO anode with a mass loading of 44 mg cm^(−2)delivers a high areal capacity of 35.4 mAh cm^(−2)at a current of 8.8 mA cm^(−2)and retains a capacity of 10.6 mAh cm^(−2)at 17.6 mA cm^(−2),greatly exceeding those of the state-of-the-art commercial or research devices.Furthermore,we show an LHGF/SiO anode with an ultra-high mass loading of 94 mg cm^(−2)delivers an unprecedented areal capacity up to 140.8 mAh cm^(−2).The achievement of such high areal capacities marks a critical step toward realizing the full potential of high-capacity alloy-type electrode materials in practical lithium-ion batteries. | Jiang Zhong Tao Wang Lei Wang Lele Peng Shubin Fu Meng Zhang Jinhui Cao Xiang Xu Junfei Liang Huilong Fei Xidong Duan Bingan Lu Yiliu Wang Jian Zhu Xiangfeng Duan | 2022 | Nano-Micro Letters2022，14，3： | 4 |
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