中国科学院机构知识库网格系统: 检索

Warming Reduces the Positive Effect of Nitrogen Addition on Soil Organic Carbon in Grasslands 期刊论文 OAI收割
ECOLOGY LETTERS, 2026, 卷号: 29, 期号: 4, 页码: e70379
作者: Shi, Ting-shuai; García‐palacios, Pablo; Collins, Scott L.; Peñuelas, Josep; Sardans, Jordi

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收藏 | 浏览/下载：17/0 | 提交时间：2026/05/22

grassland increasing temperature mineral associated organic carbon nitrogen enrichment soil carbon

Variation in Photosynthetic Efficiency under Fluctuating Light between Rose Cultivars and its Potential for Improving Dynamic Photosynthesis 期刊论文 OAI收割
PLANTS-BASEL, 2023, 卷号: 12, 期号: 5, 页码: 1186
作者: Wang,Xiao-Qian; Zeng,Zhi-Lan; Shi,Zi-Ming; Wang,Ji-Hua; Huang,Wei

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收藏 | 浏览/下载：51/0 | 提交时间：2024/05/09

chlorophyll fluorescence CO2 assimilation mesophyll conductance photosynthetic limitation stomatal conductance MESOPHYLL CONDUCTANCE TEMPERATURE RESPONSE PHOTOSYSTEM-II GAS-EXCHANGE WATER-USE INCREASING PHOTOSYNTHESIS CHLOROPHYLL FLUORESCENCE CO2 ASSIMILATION C-3 CAPACITY

Tree-ring based minimum temperature reconstruction on the southeastern Tibetan Plateau 期刊论文 OAI收割
QUATERNARY SCIENCE REVIEWS, 2021, 卷号: 251, 期号: x, 页码: -
作者: Keyimu, Maierdang; Li, Zongshan; Liu, Guohua; Fu, Bojie; Fan, Zexin

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收藏 | 浏览/下载：93/0 | 提交时间：2021/02/05

SUMMER TEMPERATURE CLIMATE-CHANGE NORTHERN-HEMISPHERE INCREASING ARIDITY RADIAL GROWTH ICE-AGE RESPONSES VARIABILITY SENSITIVITY ELEVATIONS

Influence of sensitizer concentration on the upconversion luminescence of NaYF4: Yb3+, Er3+ nanoparticles (EI CONFERENCE) 会议论文 OAI收割
2012 2nd International Conference on Machinery, Materials Science and Engineering Applications, MMSE 2012, June 16, 2012 - June 17, 2012, Wuhan, China
作者: Zhao J.; Zhao Y.; Zhao Y.; Zhao Y.

收藏 | 浏览/下载：46/0 | 提交时间：2013/03/25

A series of NaYF4: Yb3+ Er3+ nanoparticles with different doping concentration were successfully prepared by the combination of coprecipitation and hydrothermal methods using sodium citrate as chelator. Upconversion luminescence can be observed in all of the samples at room temperature. Fixed the Er3+ concentration with 1 mol% unchanged the effect of the Yb3+ concentration on the upconversion luminescence of NaYF4: Yb3+ Er3+ samples were studied when the doped Yb3+ concentrations were 0 mol% 1 mol% 2 mol% 5 mol% 10 mol% and 20 mol% respectively. As increasing the Yb 3+ concentration the total intensity of the upconversion luminescence of the samples is increasing while the ratio of red to green emission increases firstly and then decreases. The maximum ratio value is 22.1 when the Yb3+ concentration is 10 mol%. It is found that the cross relaxation and cooperative sensitization effect are the reasons for the phenomenon above. (2012) Trans Tech Publications.

Diagnostics of electron temperature and density in a capillary predischarge Ar plasma (EI CONFERENCE) 会议论文 OAI收割
2011 Academic International Symposium on Optoelectronics and Microelectronics Technology, AISOMT 2011, October 12, 2011 - October 16, 2011, Harbin, China
作者: Zhao Y.; Xie Y.; Zhao Y.; Zhao Y.

收藏 | 浏览/下载：58/0 | 提交时间：2013/03/25

The spectra of the argon plasma generated by capillary predischarge are observed in the experiments. The electron temperature and density are obtained with the method of spectrum analysis. The electron temperatures are approximately 0.7eV and the electron densities are about 11022 m-3. When increasing the pressure the electron temperature decreases and the electron density increases on the contrary. 2011 IEEE.

Fabrication and photoluminescence of ZnS: Mn2+ nanowires/ZnO quantum dots/SiO2 heterostructure (EI CONFERENCE) 会议论文 OAI收割
作者: Yang L.; Wang D.; Wang Y.; Wang Y.; Wang Y.

收藏 | 浏览/下载：55/0 | 提交时间：2013/03/25

In this paper we demonstrated the encapsulation of ZnS: Mn2+ nanowires (NWs) and ZnO quantum dots (QDs) with a layer of mesoporous SiO 2 shell for the purpose of integrating dual emission property into one common nanostructure. The average diameter of ZnS: Mn2+ NWs ZnO QDs and ZnS: Mn2+ / ZnO@SiO2 heterostructure was about 10 nm 6 nm and 22 nm respectively. Within ZnS: Mn2+ / ZnO@SiO 2 nanocomposites the intensity of the yellow-orange emission contributed by ZnS: Mn2+ NWs and the UV emission contributed by ZnO QDs was three and ten times higher than their individual components respectively. The fluorescence intensity ratio of the dual emission can be tuned by adjusting the hydrolysis time of tetraethyl orthosilicate. The peak energy of the yellow-orange and UV emission showed blueshift and redshift as increasing the temperature respectively. The anomalous enhancement of the integrated intensity for the UV emission with the temperature indicated that the high surface state density existing in ZnO QDs can overrun the influence of temperature quenching and even alter the photoluminescent properties. 2010 American Institute of Physics.

Electron transport in polymer-derived amorphous silicon oxycarbonitride ceramics (EI CONFERENCE) 会议论文 OAI收割
作者: Zhang L.; Wang Y.; Wang Y.; Wang Y.; Wang Y.

收藏 | 浏览/下载：93/0 | 提交时间：2013/03/25

The electron transport behavior of polymer-derived amorphous silicon oxycarbonitride ceramics is studied by measuring their temperature-dependent electrical conductivities. The experimental results are analyzed using theoretical models. The results reveal that the materials exhibit three conduction mechanisms: conduction in extended states conduction in band tails and conduction in localized states. Particularly it is found that in a low-temperature regime the conduction of the materials follows a band tail hopping mechanism rather than the previously assumed variable range hopping mechanism. The results also reveal that energy gaps such as EC-E F and EC-EA decrease with increasing pyrolysis temperature. 2009 The American Ceramic Society.

The P-T path with increasing temperature during retrograde metamorphism for the low-temperature and high-pressure eclogites from Leizhuang across Tongcheng area in Dabie Mountains and its tectonic significance 期刊论文 OAI收割
ACTA PETROLOGICA SINICA, 2008, 卷号: 24, 期号: 8, 页码: 1759-1770
作者: Shi YongHong; Lin Wei; Wang QingChen

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收藏 | 浏览/下载：31/0 | 提交时间：2018/09/26

The south part of Dabie Mountains Low-temperature and high-pressure eclogites peak P-T conditions Retrometamorphism with increasing temperature P-T path

The spectral feature analysis of semiconductor thin disk laser (EI CONFERENCE) 会议论文 OAI收割
Optoelectronic Materials and Devices II, November 2, 2007 - November 5, 2007, Wuhan, China
作者: Li J.; Wang L.-J.; Wang L.-J.; Ning Y.-Q.; Li J.

收藏 | 浏览/下载：54/0 | 提交时间：2013/03/25

The semiconductor thin disk laser is a new type of semiconductor laser. This work gives the basic operation function of semiconductor disk laser and analyses the heat effect by the experimentally measured photoluminescence spectrum of the laser chip at different pump power and different temperature. We can see that: with increasing pump power the thermal effects of the gain material becomes seriously and causes the saturation of carrier lifetime so the electron-hole pair created in the absorbtion layer have no enough time to rate to one of the wells and the non-radiative recombination happens in the barrier. When the thermal effects becomes stronger the chip will not lasing. This phenomenon is from the smaller energy offset between barrier and quantum well. We optimize the original structure design and experimental technology. A non-absorbing AlGaAs layer who is transparent to the pumping and laser wavelength is added to confine the carriers in the quantum wells. At the same time a DBR with double reflecting band is induced to improve the absorbing efficiency of the pumping light. The single QW is replaced by the three narrow QWs This three QWs structure can add the quantum state of QW increase the recombination probability of carriers in the QWs and reduce the heat effect. The chemical etch equipment is also improved to control the surface unevenness to be within 50 nm.

Temperature-enhanced ultraviolet emission in ZnO thin film (EI CONFERENCE) 会议论文 OAI收割
Zhang Y. J.; Xu C. S.; Liu Y. C.; Liu Y. X.; Wang G. R.; Fan X. W.

收藏 | 浏览/下载：50/0 | 提交时间：2013/03/25

We have studied the structural and optical properties of ZnO thin films prepared by thermal oxidation of ZnS films deposited by plasma assisted electron-beam evaporation on Si(1 0 0) substrates. The transformation from zinc blende ZnS to hexagonal wurtzite ZnO is confirmed by Raman and X-ray diffraction (XRD) measurement. For the sample thermally oxidized at 600 C for 2 h a novel UV emission peak Ix located at 3.22 eV (385 nm) has been observed. The temperature-dependent photoluminescence spectra show that the integrated intensity of Ix increases exponentially with increasing temperatures within the measuring temperature range from 80 to 300 K but the peak position remains nearly constant. We explain this behavior in terms of electron tunneling into the radiative recombination centers.