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| 1 | Pinless Friction Stir Welding of AA2024-T3Joint and Its Failure Modes显示文摘The joining of aluminum alloy sheets with thickness less than 2.0 mm is difficult via conventional frictionstir welding owing to the defects in the joint, such as root flaw, keyhole and lazy S. In the present research, a newlydesigned pinless tool with involute grooves on its shoulder surface was applied to weld 1.5 mm thick AA2024-T3. Theeffects of the rotating speed and welding speed on the microstructure and mechanical properties of the joints were analyzed.The experimental results showed that the root flaw and keyhole were successfully eliminated. The lazy S wasalso eliminated under the optimized welding parameters. The maximum tensile strength of the joints was 326 MPa,which is about 74.1% that of the base material. Moreover, all the tensile samples fractured from the retreating side.Two fracture modes were observed during the tensile tests, which are related with the lazy S. | Li Wenya Li Jinfeng Zhang Zhihan Gao Dalu Wang Weibing Luan Guohong | 2014 | Transactions of Tianjin University2014，20，6： | 6 |
| 2 | Duckweed based wastewater stabilization ponds for wastewater treatment(a low cost technology for small urban areas in Zimbabwe)显示文摘 | Dalu J M Ndamba J | 2003 | Physics and Chemistry of the Earth2003，28，： | 1 |
| 3 | Duckweed based wastewater stabilization ponds for wastewater treatment ( a low cost technology for small urban areas in Zimbabwe) 显示文摘 | DALU J M NDAMBA J | 2003 | Physics and Chemiestry of the Earth2003，28，： | 1 |
| 4 | Duckweed based wastewater stabilization ponds for wastewater treatment (a low cost technology for small urban areas in Zimbabwe)显示文摘 | DALU J M NDAMBA J | 2003 | Physics and Chemistry of the Earth2003，28，： | 1 |
| 5 | Estrogen receptor expression in the prostate of rats treated with dietary genistein显示文摘 | Dalu A Blaydes BS Bryant CW | 2002 | J Chromatogr B Analyt Technol Biomed Life Sci2002，777，12： | 1 |
| 6 | Duckweed based wastewater stabilization ponds for wastewater treatment ( a low cost technology for small urban areas in Zimbabwe) 显示文摘 | Dalu J M Ndamba J | 2003 | Physics and Chemistry of the Earth2003，28，： | 1 |
| 7 | Double- blind comparison of trovafloxacin and doxycycline in the treatment of uncomplicated Chlamydial urethritis and cervicitis显示文摘 | Mc Cormack WM Dalu ZA Martin DH | 1999 | Sex Transm Dis1999，26，9： | 1 |
| 8 | Genistein,a component of soy,inhibits the expression of the EGF and ErbB2/Neu receptors in the rat dorsolateral prostate显示文摘 | Dalu A Haskell JF Coward L | 1998 | Prostate1998，37，1： | 1 |
| 9 | Exploiting buck-boost duality in dual active bridge modular multilevel converters to achieve high DC step ratios显示文摘A previously unidentified duality between buck and boost configured dc‐ac modular multilevel converters(MMCs)is firstly revealed.Armed with this insight,a new dual‐active‐bridge(DAB)‐MMC is proposed for high‐voltage dc(HVDC)‐to‐medium‐voltage dc(MVDC)power conversion that utilizes cascaded buck and boost dc-ac stages to obtain high dc step ratios.Single‐phase and three‐phase variants are presented.When compared with the conventional DAB‐MMC solution for the same dc step ratio,both the single‐phase and three‐phase topologies offer reduced MVDC side transformer winding current stresses,while the three‐phase topology also yields reduced MVDC side MMC submodule current stresses.The former is achieved by having the freedom to design the transformer with a lower turns ratio,and the latter is achieved due to the inherent par-alleling of submodules on the MVDC side of the converter.Analysis of the three‐phase topology reveals its low‐voltage side transformer winding current stresses can be reduced by a factor of 3.27.A generalized mathematical model of the proposed buck-boost DAB‐MMC is derived and used to propose a dynamic controller for both the single‐phase and three‐phase topologies.Real‐time simulations obtained from a real‐time digital simulator system that incorporates an FPGA‐based controller for the valve firing controls validate the proposed buck-boost DAB‐MMC operation and dynamic controls. | Sunny Kung Dalu Liu Chatumal Perera Moosa Moghimi Haji John Salmon Gregory Kish | 2021 | High Voltage2021，6，3： | 1 |
| 10 | Remote sensing of the surface emissivity at 9μm over the globe显示文摘 | Prabhakara C Dalu G | 1976 | Journal of Geophysical Research1976，81，21： | 1 |
| 11 | Technology Development Analysis on Low Carbon for Power of Heavy-Duty Commercial Vehicle显示文摘Commercial vehicle industry worldwide is facing challenges from environmental pressures,stringent limits of CO_(2) emission,governmental regulations as well as ever-increased customer demands.This paper analyzes the above-mentioned challenges,especially in China,including the potential improvement to increase the brake thermal efficiency(BTE),with five levels of BTE proposed,ranging from current 45 to 60%in future,corresponding to China fuel consumption regulation(CFCR)in different phases.The authors also proposed the technology roadmaps to meet the upcoming CFCR3 and CFCR4;finally,the authors draw the conclusions to conform with ever-stringent regulation in China. | Jiangwei Liu Jun Li Yongjun Wang Dalu Dong Yansheng Yin Huayu Jin Shijie Sun Huili Dou Yanbo Shi Lei Fu Fei Ge | 2019 | Automotive Innovation2019，2，1： | 1 |
| 12 | Duckweed based wastewater stabilization ponds for wastewater treatment (a low cost technology for small urban areas in Zimbabwe) 显示文摘 | Ndamba J | 2003 | Physics and Chemistry of the Earth2003，28，： | 1 |
| 13 | Experimental investiga-tion numerical analysis of composite leaf spring 显示文摘 | JADHAO K K DALU D R S | 2011 | International Journal of Engineering Science and Tech-nology2011，3，6： | 1 |
| 14 | Nonlinear influence of mesoscale land use on weather and climate显示文摘 | Pielke R A G A Dalu J S Snook | 1991 | J Climate1991，4，： | 1 |
| 15 | Synaptophysin regulates clathrin-independent endoeytosis vesicles 显示文摘 | DALU C SUGIMORI M JORGE E | 2000 | Proc Natl Acad Sci USA2000，2397，11： | 1 |
| 16 | Estimation of Sea Tem- perature from Remote Sensing in the 11 to 12 pm Window Region显示文摘 | Prabhakara C Dalu G Kunde V G | 1974 | Journal of Geophysical Research Atmospheres1974，，79： | 1 |
| 17 | Duckweed based wastewater stabilization ponds for wastewater treatment(a low cost technology for small urban areas in Zimbabwe)显示文摘 | Dalu J M Ndamba J | 2003 | Physics and Chemistry of the Earth Parts A/B/C2003，28，2021222324252627： | 1 |
| 18 | Duckweed based wastewater stabilization ponds for wastewater treatment; a low cost technology for small urban areas in Zimbabwe显示文摘 | Dalu J M Ndamba J | 2002 | Water Demand Management for Sustainable Development2002，12，： | 1 |
| 19 | A controlledtrial of a single dose of azithromycin for the treatment ofchlamydial urethritis and cervicitis 显示文摘 | Martin D H Mroczkowski T F Dalu Z A | 1992 | N Eng J Med1992，327，13： | 1 |
| 20 | Duckweed based wastewater stabilization ponds for wastewater treatment(a low cost technology for small urban areas in Zimbabwe)显示文摘 | Dalu J M Ndamba J | 2003 | Physics and Chemistry of the Earth2003，28，： | 1 |
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