With an urgent demand of energy efficientcoatings for building fenestrations, vanadium dioxide（VO2）-based thermochromic smart coatings have beenwidely investigated due to the reversible phase transition ofVO2 at a c...With an urgent demand of energy efficientcoatings for building fenestrations, vanadium dioxide（VO2）-based thermochromic smart coatings have beenwidely investigated due to the reversible phase transition ofVO2 at a critical transition temperature of 68 ℃, which isaccompanied by the modulation of solar irradiation, espe-cially in the near-infrared region. As for commercialapplications in our daily life, there are still some obstaclesfor VO2-based smart coatings, such as the high phasetransition temperature, optical properties （luminous trans-mittance and solar modulation ability）, environmental sta-bility in a long-time period, as well as mass production. Inthis review, recent progress of thermochromic smart coat-ings to solve above obstacles has been surveyed. Mean-while, future development trends have also been given topromote the goal of commercial production of VO2 smartcoatings.展开更多
The VO2 thin film with high performance of metal-insulator transition （MIT） is prepared on R-sapphire substrate for the first time by magnetron sputtering with rapid thermal process （RTP）. The electrical character...The VO2 thin film with high performance of metal-insulator transition （MIT） is prepared on R-sapphire substrate for the first time by magnetron sputtering with rapid thermal process （RTP）. The electrical characteristic and THz transmittance of MIT in VO2 film are studied by four-point probe method and THz time domain spectrum （THz-TDS）. X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, atomic force microscopy （AFM）, and search engine marketing （SEM） are employed to analyze the crystalline structure, valence state, surface morphology of the film. Results indicate that the properties of VO2 film which is oxidized from the metal vanadium film in oxygen atmosphere are improved with a follow- up RTP modification in nitrogen atmosphere. The crystallization and components of VO2 film are improved and the film becomes compact and uniform. A better phase transition performance is shown that the resistance changes nearly 3 orders of magnitude with a 2-~C hysteresis width and the THz transmittances are reduced by 64% and 60% in thermal and optical excitation respectively.展开更多
目的:跑台、功率自行车和手摇功率计测量游泳运动员VO_(2max),对比分析三种测试方法。方法:34名游泳运动员分别用三种方法测试VO_(2max),对测试的VO_(2max)进行Paired-Samples T Test和Pearson相关性分析。结果:跑台、功率自行车和手摇...目的:跑台、功率自行车和手摇功率计测量游泳运动员VO_(2max),对比分析三种测试方法。方法:34名游泳运动员分别用三种方法测试VO_(2max),对测试的VO_(2max)进行Paired-Samples T Test和Pearson相关性分析。结果:跑台、功率自行车和手摇功率计测试VO_(2max)均值分别为4914.6±789.91、4424.2±560.85、2859.2±347.52ml·omin-1。跑台-功率自行车、跑台-手摇功率计、功率自行车-手摇功率计配对t检验,p值为0.000、0.007、0.004。Pearson相关分析,跑台-功率自行车(r=0.920,P<0.001);跑台-手摇功率计(r=0.754,P<0.05);功率自行车-手摇功率计(r=0.801,P<0.01)。结论:三种方法两-两间高度相关,均可用来测量游泳运动员的最大摄氧量,跑台和功率自行车相关度最高,建议首选跑台、其次功率自行车。展开更多
文摘With an urgent demand of energy efficientcoatings for building fenestrations, vanadium dioxide（VO2）-based thermochromic smart coatings have beenwidely investigated due to the reversible phase transition ofVO2 at a critical transition temperature of 68 ℃, which isaccompanied by the modulation of solar irradiation, espe-cially in the near-infrared region. As for commercialapplications in our daily life, there are still some obstaclesfor VO2-based smart coatings, such as the high phasetransition temperature, optical properties （luminous trans-mittance and solar modulation ability）, environmental sta-bility in a long-time period, as well as mass production. Inthis review, recent progress of thermochromic smart coat-ings to solve above obstacles has been surveyed. Mean-while, future development trends have also been given topromote the goal of commercial production of VO2 smartcoatings.
基金Project supported by the Young Scientists Fund of the National Natural Science Foundation of China(Grant No.61101055)the Specialized Research Fund for the Doctoral Program of Higher Education of China(Grant No.20100032120029)
文摘The VO2 thin film with high performance of metal-insulator transition （MIT） is prepared on R-sapphire substrate for the first time by magnetron sputtering with rapid thermal process （RTP）. The electrical characteristic and THz transmittance of MIT in VO2 film are studied by four-point probe method and THz time domain spectrum （THz-TDS）. X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS）, atomic force microscopy （AFM）, and search engine marketing （SEM） are employed to analyze the crystalline structure, valence state, surface morphology of the film. Results indicate that the properties of VO2 film which is oxidized from the metal vanadium film in oxygen atmosphere are improved with a follow- up RTP modification in nitrogen atmosphere. The crystallization and components of VO2 film are improved and the film becomes compact and uniform. A better phase transition performance is shown that the resistance changes nearly 3 orders of magnitude with a 2-~C hysteresis width and the THz transmittances are reduced by 64% and 60% in thermal and optical excitation respectively.
文摘目的:跑台、功率自行车和手摇功率计测量游泳运动员VO_(2max),对比分析三种测试方法。方法:34名游泳运动员分别用三种方法测试VO_(2max),对测试的VO_(2max)进行Paired-Samples T Test和Pearson相关性分析。结果:跑台、功率自行车和手摇功率计测试VO_(2max)均值分别为4914.6±789.91、4424.2±560.85、2859.2±347.52ml·omin-1。跑台-功率自行车、跑台-手摇功率计、功率自行车-手摇功率计配对t检验,p值为0.000、0.007、0.004。Pearson相关分析,跑台-功率自行车(r=0.920,P<0.001);跑台-手摇功率计(r=0.754,P<0.05);功率自行车-手摇功率计(r=0.801,P<0.01)。结论:三种方法两-两间高度相关,均可用来测量游泳运动员的最大摄氧量,跑台和功率自行车相关度最高,建议首选跑台、其次功率自行车。
