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| 1 | Present Situation of the Anti-Fatigue Processing of High-Strength Steel Internal Thread Based on Cold Extrusion Technology:A Review显示文摘The adoption of cold-extrusion forming for internal thread net forming becomes an important component of anti-fatigue processing with the development of internal thread processing towards high performance, low cost and low energy consumption. It has vast application foreground in the field of aviation, spaceflight, high speed train and etc. The internal thread processing and anti-fatigue manufacture technology are summarized. In terms of the perspective of processing quality and fatigue serving life, the advantages and disadvantages of the processing methods from are compared. The internal thread cold-extrusion processing technology is investigated for the purpose of improving the anti-fatigue serving life of internal thread. The superiorities of the plastic deformation law and surface integrity of the metal layer in the course of cold extrusion for improving its stability and economy are summed up. The proposed research forecasts the development tendency of the internal thread anti-fatigue manufacturing technology. | Hong MIAO Cheng JIANG Sixing LIU Shanwen ZHANG Yanjun ZHANG | 2017 | Chinese Journal of Mechanical Engineering2017，30，2： | 5 |
| 2 | Late Mesozoic rifting and its deep dynamic mechanisms in the central Sulu orogenic belt: Records from Lingshan Island显示文摘The Lingshan Island scientific drill confirms that two episodes(Laiyang period and Qingshan period) of rifting developed in the central Sulu orogenic belt(SOB) in Late Mesozoic. With a set of methods including fieldwork, drilling, core logging, zircon U-Pb dating and whole rock geochemistry applied, the age, the depositional sequence and the deep dynamic mechanisms of rift evolution were unraveled. The stratigraphic sequence of the Laiyang-Qingshan Groups on Lingshan Island was composed of two different rifting sequences:(1) Laiyang Group(147–125 Ma), which consists of deep-water gravity flow deposits with interlayers of intermediate volcanic rocks;and(2) Lower Qingshan Group(125–119 Ma), which unconformably overlies the former sequence and contains subaerial volcanic deposits and terrestrial deposits. The tectonic environment changed during the evolution of these two episodes of rifting: the rift was in a NNW-SSE extensional environment in the Laiyang period and showed the typical passive rifting character that “lithospheric extension and rifting preceded volcanism”. The passive rifting period was ended by a short WNW-ESE compression at about 125 Ma. After that, the tectonic environment transferred to a strong NW-SE extensional environment and the rifting evolved into a volcanic arc basin in the Qingshan period. The igneous rocks are shoshonitic to high-K calc-alkaline trachyandesites to trachytes with a few intercalated lamprophyres and a rhyolite.The geochemical characteristics of the igneous rocks indicate that they are mantle-derived melts with a metasomatized mantle source and/or crustal contamination. In addition, an increased thinning of the lithosphere happened during the rifting episodes.The low-angle subduction of the Paleo-Pacific plate in the Jurassic weakened the thickened SOB lithospheric mantle. The rollback of the subducting plate started in late Jurassic to early Cretaceous, and the SOB lithospheric mantle was delaminated synchronously because of the gravity collapse. Thus, this caused passive rifting in the Laiyang period. Thereafter, the rollback and trench retreat of the high-angle subducting Paleo-Pacific plate would have achieved its climax, resulting in the strong regional extension. Passive rifting was ended by the crustal uplift caused by asthenospheric upwelling beneath the rift. The lower crust was heated by the upwelling asthenosphere and partially melted to form felsic melts, which were emplaced upwards and erupted explosively. The rift evolved into a volcanic arc basin in the Qingshan period and showed some characteristics of active rifting. Above all, a passive rifting in the Laiyang period and a volcanic arc basin in the Qingshan period developed successively in the Lingshan Island area(the central SOB). This records the transfer of the study area from the Paleo-Tethys tectonic domain to the circum-Pacific tectonic domain. The delamination of SOB lithospheric mantle and the upwelling of asthenospheric material were the deep dynamic mechanisms driving the development and evolution of two rift episodes. Additionally, the rift development was controlled remotely by the subduction of the Paleo-Pacific plate. | Tengfei ZHOU Yaoqi ZHOU Nina SФAGER Paul Martin HOLM Zhenkai ZHANG Jun WANG Zhao LIANG Hongyu MU Yanjun CHENG Feifei LIU Miao WANG Yue ZHANG Hui ZHANG Yangjian GU Shihui DONG Hanjie ZHAO Manjie LI Yang CHEN Yanzi LIU | 2022 | Science China Earth Sciences2022，65，9： | 3 |
| 3 | Fretting wear behaviour of machined layer of nickel-based superalloy produced by creep-feed profile grinding显示文摘Fretting wear has an adverse impact on the fatigue life of turbine blade roots.The current work is to comparatively investigate the fretting wear behaviour of the nickel-based superalloy surfaces produced by polishing and creep-feed profile grinding,respectively,in terms of surface/subsurface fretting damage,the friction coefficient,wear volume and wear rate.Experimental results show that the granulated tribolayer aggravates the workpiece wear,while the flat compacted tribolayer enhances the wear resistance ability of workpiece,irrespective of whether the workpiece is processed by polishing or grinding.However,the wear behaviors of tribolayers are different.For the polished surface,when the normal load exceeds 100 N,the main defects are crack,rupture,delamination and peeling of workpiece materials;the wear mechanism changes from severe oxidative wear to fatigue wear and abrasive wear when the loads increase from 50 to 180 N.As for the ground surface,the main wear mechanism is abrasive wear.Particularly,the ground surface possesses better wear-resistant ability than the polished surface because the former has the lower values in coefficient friction(0.23),wear volume(0.06×10^(6)μm^(3))and wear rate(0.25×10^(-16)Pa^(-1)).Finally,an illustration is given to characterize the evolution of wear debris on such nickel-based superalloy on the ground surface. | Weijie KUANG Qing MIAO Wenfeng DING Yanjun ZHAO Biao ZHAO Xuebing WEN Shaopeng LI | 2022 | Chinese Journal of Aeronautics2022，35，10： | 3 |
| 4 | Finite time dual neural networks with a tunable activation function for solving quadratic programming problems and its application显示文摘 | Miao Peng Shen Yanjun Xia Xiaohua | 2014 | Neurocomputing2014，143，： | 1 |
| 5 | Solving time-varying quadratic programs based on finite-time Zhang neural networks and their application to robot tracking显示文摘 | Miao Peng Shen Yanjun Huang Yuehua | 2015 | Neural Computing and Application2015，26，3： | 1 |
| 6 | Finite-time stability and its application for solving time-varying Sylvester equation by recurrent neural network显示文摘 | Shen Yanjun Miao Peng Huang Yuehua | 2015 | Neural Process Lett2015，42，3： | 1 |
| 7 | Relaxed silicon-germaniun-on-insulator substrates by oxygen implantation into pseudomorphic silicon germanium/silicon heterostructure 显示文摘 | Wu Yanjun Zhang Miao | 2003 | Applied Physics Letters2003，82，： | 1 |
| 8 | Core Issues in Design of Tibetan Grassland Ecological Compensation Mechanism显示文摘Scientific grassland ecological compensation mechanism is favorable for improving the grassland ecological environment and promote the sustainable development of animal husbandry. Combined with actual situations of Tibet,this paper discussed core issues in the design of grassland ecological compensation mechanism,including compensation purpose,compensation subject,compensation object,compensation standard,and compensation method. It pointed out that the design of mechanism is a complex and systematic project. Each issue is complex and varied. The government at all levels should be cautious and make scientific treatment,and should not apply a single solution for all issues. | Tianping LIU Yanjun MIAO Qianlu SUN | 2016 | Asian Agricultural Research2016，8，12： | 0 |
| 9 | An Objective Approach to Generating Multi-Physics Ensemble Precipitation Forecasts Based on the WRF Model显示文摘Selecting proper parameterization scheme combinations for a particular application is of great interest to the Weather Research and Forecasting(WRF)model users.This study aims to develop an objective method for identifying a set of scheme combinations to form a multi-physics ensemble suitable for short-range precipitation forecasting in the Greater Beijing area.The ensemble is created by using statistical techniques and some heuristics.An initial sample of 90 scheme combinations was first generated by using Latin hypercube sampling(LHS).Then,after several rounds of screening,a final ensemble of 40 combinations were chosen.The ensemble forecasts generated for both the training and verification cases using these combinations were evaluated based on several verification metrics,including threat score(TS),Brier score(BS),relative operating characteristics(ROC),and ranked probability score(RPS).The results show that TS of the final ensemble improved by 9%-33%over that of the initial ensemble.The reliability was improved for rain≤10 mm day^-1,but decreased slightly for rain>10 mm day^-1 due to insufficient samples.The resolution remained about the same.The final ensemble forecasts were better than that generated from randomly sampled scheme combinations.These results suggest that the proposed approach is an effective way to select a multi-physics ensemble for generating accurate and reliable forecasts. | Chenwei SHEN Qingyun DUAN Wei GONG Yanjun GAN Zhenhua DI Chen WANG Shiguang MIAO | 2020 | Journal of Meteorological Research2020，34，3： | 0 |
| 10 | Light-guided tumor diagnosis and therapeutics:From nanoclusters to polyoxometalates显示文摘Malignant tumors,with the characteristics of easy metastasis and recurrence,are a serious threat to health of mankind.It is urgent to develop promising clinical cancer targeted agents with combination of rapid diagnosis and efficient therapies.Compared with the conventional photosensitizing agents,the recent advances of nanoagents based on transition metal-oxide clusters possess unique structural and electronic properties,greatly improving cancer survival rate,meanwhile,keeping high contrast imaging.This review provides a brief introduction of metal-oxide clusters,including both nanoclusters to molecular clusters,specifically polyoxometalates(POMs).Subsequently,biocompatibility of metal-oxide clusters is emphasized from aspects of endocytosis,macropinocytosis,and phagocytosis.Through the classification of late and early transition metals oxide clusters,recent outcomes of light-guided nanoagents are represented with their intriguing chemical and optical properties in their diagnosing and photochemotherapy performance.It shed light on the summary of next generation multifunctional cancer targeting agents'developments as well as outlook of materials selection trends and research direction in the future. | Xiaofeng Fan Wei Pang Hao Feng Ruiyi Zhang Wentao Zhu Qiushi Wang Jun Miao Yiwen Li Yanjun Liu Xiaoqian Xu | 2022 | Chinese Chemical Letters2022，33，6： | 0 |
| 11 | Optimal Energy-Efficient Operation of a Metro Train on a Long and Steep Downhill Segment显示文摘Because the standard four-stage operation and con-trol strategy cannot fully utilize the gravitational potential energy of a train operating on a long and steep downhill segment,this paper further improves the method for train operation and control strategy.The improved operation includes three stages of acceleration,coasting-speed limit cruising,and brak-ing.Taking the speed limit,time limit,and distance limit as the constraints,the coasting condition switching point,braking condition switching point,traction coefficient,and braking force coefficient are used as the decision variables.Then,an improved train traction energy consumption model is constructed,and an improved differential evolution algorithm is designed to solve this model.The improved method is used to simulate two long and steep downhill segments of the Nanning metro.The results show that the improved method can meet the requirements of speed limit,time limit,and distance limit.Compared with the standard four-stage operation,the improved train operation and control strategy can reduce train energy consumption by more than 40%on the two long and steep downhill segments;compared with other similar algorithms,the improved algorithm is more suitable for solving the model. | Deqiang He Hanqing Jian Yanjun Chen Jian Miao Zhixiao Luo Chonghui Ren Lang Zhang | 2023 | CSEE Journal of Power and Energy Systems2023，9，6： | 0 |
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