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Current advances in haploid stem cells

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Protein & Cell 2020年第1期11卷 23-33页

作者： Tongtong cui Zhikun Li qi Zhou Wei Li State Key Laboratory of Stem Cell and Reproductive Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China Institute for Stem Cell and Regeneration Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Diploidy is the typical genomic mode in all *** stem cells are artificial cell lines experimentally derived in vitro in the form of different types of stem cells,which combine the characteristics of haploidy with a broad developmental potential and open the possibility to uncover biological mysteries at a genomic *** date,a multitude of haploid stem cell types from mouse,rat,monkey and humans have been derived,as more are in *** have been applied in high-throughput genetic screens and mammalian assisted ***,we review the generation,unique properties and broad applications of these remarkable cells.

关键词： haploidy parthenogenetic androgenetic stem cells diploidization functional genomics imprinting

Tearing Toughness of Ductile Metals

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Acta Metallurgica Sinica(English Letters) 2016年第2期29卷 150-155页

作者： cui-Hong Li qi-qiang Duan Zhe-Feng Zhang Shenyang national Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

A new parameter, i.e., tearing toughness, was employed to characterize the mechanical properties of some ductile metals （Cu, Cu-2 wt% Be, Cu-Al alloys, and some steels） by using three-leg trousers tearing tests. The experi- mental results demonstrate that their tearing toughness is not a physical constant and shows a close relationship with the materials＇ types and microstructures. It can be inferred that the tearing toughness of different ductile metals has their respective variation range, expectantly, and may be represented by the comprehensive mechanical properties of strength and ductility for various ductile materials.

关键词： Ductile metals Strength Ductility Tearing toughness

Selective leaching of vanadium from V-Ti magnetite concentrates by pellet calcification roasting-H_(2)SO_(4) leaching process

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International Journal of Mining Science and Technology 2021年第3期31卷 507-513页

作者： Yi Luo Xiaokui Che Xinglan.cui qi Zheng Lei Wang national Engineering Laboratory of Biohydrometallurgy GRINM Group Corp.Ltd.Beijing 101407China GRInM Resources and Environment Tech.Co. Ltd.Beijing 101407China General Research Institute for nonferrous Metals Beijing 100088China

A novel method of pellet calcification roasting-H_(2)SO_(4) leaching was proposed to efficiently separate and extract vanadium(V)from vanadium-titanium(V-Ti)magnetite *** leaching rate of V is as high as 88.98%,while the leaching rate of impurity iron is only 1.79%.Moreover,the leached pellets can be used as raw materials for blast furnace ironmaking after secondary roasting.X-ray photoelectron spectroscopy(XPS)and scanning electron microscopy with energy dispersive X-ray spectrometry(SEMEDS)analyses showed that V^(3+)was oxidized to V^(5+)after roasting at 1200℃,and V^(5+)was then leached by H_(2)SO_(4).X-ray diffraction(XRD)analyses and single factor experiment revealed a minimal amount of dissolved Fe_(2)O_(3) during H_(2)SO_(4) ***,a high separation degree of V and iron(Fe)from V-Ti magnetite concentrate was achieved through H_(2)SO_(4) *** with the traditional roastingleaching process,this process can achieve a high selectivity of V and Fe,and has excellent prospects for industrial production.

关键词： Selective leaching Vanadium V-Ti magnetite concentrate Pellets Sulfuric acid

Effects of Active Gases on Droplet Transfer and Weld Morphology in Pulsed-Current nG-GMAW of Mild Steel

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Chinese Journal of Mechanical Engineering 2021年第4期34卷 249-261页

作者： Guoqiang Liu Xinhua Tang qi Xu Fenggui Lu Haichao cui Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240China

The current research of narrow-gap gas metal arc welding(nG-GMAW)primarily focuses on improving the sidewall fusion and avoiding the lack-of-fusion ***,the high cost and operation difficulty of the methods limit the industrial *** this study,small amount of active gases CO_(2) and O_(2) were added into pure argon inert shielding gas to improve the weld formation of pulsed-current narrow-gap gas metal arc welding(nG-GMAW)of mild *** effects on droplet transfer and arc behavior were investigated.A high-speed visual sensing system was utilized to observe the metal transfer process and arc *** the proportion of CO_(2),being added into the pure argon shielding gas,changes from 5%to 25%,the metal transfer mode changes from pulsed spray streaming transfer to pulsed projected spray transfer,while it remains the pulsed spray streaming transfer when 2%to 10%O_(2) is *** CO2 and O_(2) are favorable to stabilizing arc and welding process.O_(2) is even more effective than CO_(2).However,O_(2) is more likely to cause slags on the weld surface,while CO_(2) can improve the weld appearance in some *** weld surface concavity in nG-GMAW is greatly influenced by the addition of active gas,but the weld width and weld penetration almost keep *** study proposes a new method which is beneficial to improving the weld bead formation and welding process stability.

关键词： Metal transfer Active gases Pulsed-current nG-GMAW Weld morphology

Effect of Carbon Migration on Interface Fatigue Crack Growth Behavior in 9Cr/CrMoV Dissimilar Welded Joint

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Acta Metallurgica Sinica(English Letters) 2022年第5期35卷 714-726页

作者： qi Wang Chendong Shao Haichao cui Yuan Gao Fenggui Lu Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China

Fatigue crack growth(FCG)behavior of 9 Cr/CrMoV dissimilar welded joint at elevated temperature and different stress ratios was *** was paid to the region near the fusion line of 9 Cr where carbon-enriched zone(CEZ)and carbon-depleted zone(CDZ)formed due to carbon migration during the welding *** and brittle tempered martensite dominated the stress ratio-insensitive FCG behavior in the coarse grain zone(CGZ)of 9 *** crack near the CGZ-CEZ interface,crack deflection through the CEZ and into the CDZ was observed,accompanied by an accelerating FCG *** with the severe plastic deformation near the secondary crack in 9 Cr-CGZ,the electron back-scattered diffraction analysis showed less deformation and lower resistance in the direction toward the brittle CEZ,which resulted in the transverse *** spite of the plastic feature in CDZ revealed by fracture morphology,the less carbides due to carbon migration led to lower strength and weaker FCG resistance property in this *** conclusion,the plasticity deterioration in CEZ and strength loss in CDZ accounted for the FCG path deflection and FCG rate acceleration,respectively,which aggravated the worst FCG resistance property of 9 Cr-HAZ in the dissimilar welded joint.

关键词： Fatigue crack growth Dissimilar welded joint Carbon migration Crack transverse deflection Carbonenriched zone

Circuit Model with Current Interruption for Hybrid High Voltage DC Circuit Breakers to Achieve Precise Current Experiments

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CSEE Journal of Power and Energy Systems 2022年第4期8卷 1250-1260页

作者： Zhonghao Dongye Lei qi Bing Ji Xiaoguang Wei Xiang cui State Key Laboratory of Altermate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China School of Engineering University of LeicesterLE17RH LeicesterU.K State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconection Research Institute Co.Ld.Beijing 102209China

The current interruption test based on an LC resonance circuit for hybrid DC circuit breakers(HVDC CBs)is widely employed to characterize the current interruption capability of *** order to ensure a high-fidelity replica of the fault current in a high voltage application,this paper first proposes an equivalent model of the test circuit,where not only parasitic resistances but also the threshold voltages and on-state resistances of various semiconductor devices are ***,the analytical formula of the test current is derived by including the working principle of the HVDC ***,the parameter extraction method,which combines finite element analysis and measurements by an impedance analyzer,is given in this *** extracted result implies that,in current interruption transients,equivalent resistances of 500 kV CB are as large as 535 mS,which have a significant influence on current ***,the 34 kV/25 kA current interruption test for the 500 kV CB is *** measured results are proved to be consistent with the analytical results obtained from the proposed model,and the relative error is less than 2%.

关键词： Current interruption test high voltage DC circuit breaker

Improved taylor-series location algorithm for cooperation networks

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The Journal of China Universities of Posts and Telecommunications 2007年第2期14卷 38-44页

作者： LIU Jun.cui qi-mei TAO Xiao-feng Key Laboratory of Ubiquitous Wireless Communication Beijing University of Posts and Telecommunications Beijing 100876 China

This article presents an iterative algorithm for estimating the location of the destination mobile station （DS） when some extra mobile stations around the DS are involved in and assist the base stations to complete the localization process. The proposed method is based on the taylor-series （TS） method and jointly estimates both the DS and the extra mobile stations, named reference mobile station （RS） in this article, positions simultaneously. Moreover, the time-differential-of-arrival （TDOA） measurements between DS and pairs of RSs are obtained by ultra-wide-band （UWB） signal, which is adept in accurate ranging application. According to the theoretic analysis, the Cramer-Rao lower bound （CRLB） of the modified TS algorithm reduces significantly. The actual performance, under a given simulation scenario, is enhanced by 25% at best.

关键词： UWB CRLB TS TDOA least-square (LS)

Edge Intelligence with Distributed Processing of Dnns:A Survey

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Computer Modeling in Engineering & Sciences 2023年第7期136卷 5-42页

作者： Sizhe Tang Mengmeng cui Lianyong qi Xiaolong Xu School of Computer and Software Nanjing University of Information Science and TechnologyNanjing210000China School of Computer Science Qufu Normal UniversityQufu273100China

Withthe rapiddevelopment of deep learning,the size of data sets anddeepneuralnetworks(Dnns)models are also *** a result,the intolerable long time for models’training or inference with conventional strategies can not meet the satisfaction of modern tasks ***,devices stay idle in the scenario of edge computing(EC),which presents a waste of resources since they can share the pressure of the busy devices but they do *** address the problem,the strategy leveraging distributed processing has been applied to load computation tasks from a single processor to a group of devices,which results in the acceleration of training or inference of Dnn models and promotes the high utilization of devices in edge *** with existing papers,this paper presents an enlightening and novel review of applying distributed processing with data and model parallelism to improve deep learning tasks in edge *** the practicalities,commonly used lightweight models in a distributed system are introduced as *** the key technique,the parallel strategy will be described in *** some typical applications of distributed processing will be ***,the challenges of distributed processing with edge computing will be described.

关键词： Distributed processing edge computing parallel strategies acceleration of Dnn processing

Distributed location model and algorithm with position uncertainty

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The Journal of China Universities of Posts and Telecommunications 2014年第2期21卷 48-56页

作者： SHI Yu-long cui qi-me CAO Si-qi TAO Xiao-feng Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications

The localization of multiple mobile terminals （MTs） is an encouraging paradigm of applications in wireless networks. Peer-to-peer communication between MTs facilitates the cooperative localization of multiple MTs. For sake of low complexity and high robustness, investigations often focus on the distributed algorithm in cooperative localization. However, the impact from position uncertainty of cooperative MT lacks of analysis in related works. A new distributed location model, as well as corresponding algorithm, is devised when considering both the distance measurement error and the position uncertainty of MTs, which is more judicious than the traditional model for distributed cooperative localization scenario. In addition, the performance of proposed algorithm is analyzed through Cramér-Rao lower bound （CRLB）. Simulations indicate that the algorithm outperforms traditional methods in terms of accuracy and robustness.

关键词： distributed algorithm cooperative localization position tmcertainty