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| 1 | FROST RESISTANCE OF POLYVINYL ALCOHOL FIBER REINFORCED CEMENTITIOUS COMPOSITES显示文摘This article studies the frost resistance of polyvinyl alcohol (PVA) fiber reinforced cementitious composites. The test samples contain different PVA fiber volume fractions such as 0, 0.5%, 1% and 2%. The freeze-thaw test is carried on in TDR type apparatus. The outward appearance, the weight loss factor and the relative dynamic elastic modulus are analyzed, and conclusions are drawn that PVA fibers can significantly improve the frost resistance of cementitious composites and frost resistance of PVA fiber reinforced cementitious composites with fiber volumetric fraction of 1% is better. | Jianwen Bai 1 Shuguang Liu 1 Rongyue Guo 2 Rong Xu 3 ( 1 Institute of Mining Technology, Inner Mongolia University of Technology, Hohhot 010051, China) ( 2 Testing Center of China Railway Group Six Hohhot Railway Bureau Construction CO. LTD, Hohhot 010050, China) ( 3 Civil Engineering and Architectural, Inner Mongolia Institute of Architectural Technology, Hohhot 010070, China) | 2011 | Acta Mechanica Solida Sinica2011，24，S1： | 3 |
| 2 | cities显示文摘 | DOCKERY D W POPE C A XU X An association between air pollution and mortality in six U S | 1993 | N Engl J Med1993，329，24： | 1 |
| 3 | Improved hydrogen desorption properties of ammonia borane by Ni-modified metal-organic frame- works 显示文摘 | SIX L SUN L X XU F | 2011 | Int J Hydrogen Energy2011，36，22： | 1 |
| 4 | Highly flexible,foldable,and rollable microsupercapacitors on an ultrathin polyimide substrate with high power density显示文摘The design and functionality of extremely flexible,foldable,and rollable microsupercapacitors(MSCs)with in-plane interdigital electrodes that consist of single-walled carbon nanotube(SWCNT)networks on an ultrathin polyimide substrate are demonstrated through experiments and finite element simulations.The all-solid-state MSCs can be reversibly bent,folded,and rolled purely elastically without degradation of their electrical performance.The simulation results confirm that the deformation in bent,folded,and rolled MSCs is purely elastic.The high power density(1125W cm^(–3))and small time constant(1 ms)of the present MSCs are comparable to those of aluminum electrolytic capacitors.The MSCs operate at scan rates of up to 1000 V s^(–1),are characterized by a volumetric capacitance of 18 F cm^(–3) and an energy density of 1.6 mWh cm^(–3),and exhibit superior electrochemical stability with 96% capacity retention even after 100,000 charge/discharge cycles.The developed MSCs demonstrate high potential for integration in flexible and wearable electronic systems. | Juan Pu Xiaohong Wang Renxiao Xu Sixing Xu Kyriakos Komvopoulos | 2018 | Microsystems & Nanoengineering2018，4，1： | 1 |
| 5 | APPLICATIONS OF GRBNER BASIS FOR WEYL ALGEBRA显示文摘This paper will prove that f≡g(modI) iff N F(f)=N F(g) for f,g∈K[x,],obtain a basis for the K vector space K[x,]/I,give the method for finding a Grbner basis of intersection of the left ideals I and J. | Sixing Xu (Yueyang Teachers College,Hunan,) | 2000 | 数学理论与应用2000，20，2： | 1 |
| 6 | Multimodal MEMS vibration energy harvester with cascaded flexible and silicon beams for ultralow frequency response显示文摘Scavenged energy from ambient vibrations has become a promising energy supply for autonomous microsystems.However,restricted by device size,most MEMS vibration energy harvesters have much higher resonant frequencies than environmental vibrations,which reduces scavenged power and limits practical applicability.Herein,we propose a MEMS multimodal vibration energy harvester with specifically cascaded flexible PDMS and'zigzag'silicon beams to simultaneously lower the resonant frequency to the ultralow-frequency level and broaden the bandwidth.A two-stage architecture is designed,in which the primary subsystem consists of suspended PDMS beams characterized by a low Young's modulus,and the secondary system consists of zigzag silicon beams.We also propose a PDMS lift-off process to fabricate the suspended flexible beams and the compatible microfabrication method shows high yield and good repeatability.The fabricated MEMS energy harvester can operate at ultralow resonant frequencies of 3 and 23 Hz,with an NPD index of 1.73μW/cm^(3)/g^(2)@3 Hz.The factors underlying output power degradation in the low-frequency range and potential enhancement strategies are discussed.This work offers new insights into achieving MEMS-scale energy harvesting with ultralow frequency response. | Haizhao Feng Ling Bu Zhangshanhao Li Sixing Xu Bingmeng Hu Minghao Xu Siyao Jiang Xiaohong Wan | 2023 | Microsystems & Nanoengineering2023，9，2： | 0 |
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