中国科学院机构知识库网格系统: 检索

Contrasting streamflow regimes induced by melting glaciers across the Tien Shan - Pamir - North Karakoram 期刊论文 OAI收割
SCIENTIFIC REPORTS, 2018, 卷号: 8, 期号: 0, 页码: 文献号: 16470
作者: Zhang, YQ (Zhang, Yiqing); Gan, R (Gan, Rong); He, CS (He, Chansheng); Luo, Y (Luo, Yi); Wang, XL (Wang, Xiaolei)

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收藏 | 浏览/下载：52/0 | 提交时间：2019/05/16

Climate-change Impacts Tianshan Mountains Flood Frequency Water-resources Runoff Changes Mass Balances Central-asia River-basin China Scale

Observed and Simulated Lake Effect Precipitation Over the Tibetan Plateau: An Initial Study at Nam Co Lake 期刊论文 OAI收割
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2018, 卷号: 123, 期号: 13, 页码: 6746-6759
作者: Wang, L (Wang, Lei); Zhu, LJ (Zhu, Lingjing); Zhang, XW (Zhang, Xiaowen); Dai, YF (Dai, Yufeng); Yao, TD (Yao, Tandong)

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收藏 | 浏览/下载：49/0 | 提交时间：2019/05/29

REGIONAL CLIMATE MODEL WATER STORAGE CHANGES GREAT-LAKES EFFECT SNOWSTORMS EFFECT STORMS CLOUD BANDS MICHIGAN SNOWFALL ONTARIO FREQUENCY

Response of Arbuscular Mycorrhizal Fungi to Simulated Climate Changes by Reciprocal Translocation in Tibetan Plateau 期刊论文 OAI收割
notulae botanicae horti agrobotanici cluj-napoca, 2015, 卷号: 43, 期号: 2, 页码: 488-493
作者: Shi, Zhaoyong; Yin, Xubin; Mickan, Bede; Wang, Fayuan; Zhang, Ying

收藏 | 浏览/下载：32/0 | 提交时间：2016/12/19

arbuscular mycorrhizas climate changes colonization frequency colonization intensity spore density

Monitoring the spatio-temporal dynamics of swidden agriculture and fallow vegetation recovery using Landsat imagery in northern Laos SCI/SSCI论文 OAI收割
2015
作者: Liao C. H.; Feng, Z. M.; Li, P.; Zhang, J. H.

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收藏 | 浏览/下载：19/0 | 提交时间：2015/12/09

Swidden Agriculture Spatio-temporal Changes Swidden Cycle Frequency Of Swidden Use Fallow Vegetation Recovery Landsat Laos Slash-and-burn Southeast-asia Shifting Cultivation Tropical Forests Mountains Carbon Demise Soil

Response of Arbuscular Mycorrhizal Fungi to Simulated Climate Changes by Reciprocal Translocation in Tibetan Plateau 期刊论文 OAI收割
NOTULAE BOTANICAE HORTI AGROBOTANICI CLUJ-NAPOCA, 2015, 卷号: 43, 期号: 2, 页码: 488-493
作者: Shi, Zhaoyong; Yin, Xubin; Mickan, Bede; Wang, Fayuan; Zhang, Ying

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收藏 | 浏览/下载：35/0 | 提交时间：2022/09/13

arbuscular mycorrhizas climate changes colonization frequency colonization intensity spore density

The application of adaptive enhancement algorithm based on gray entropy in mammary gland CR image (EI CONFERENCE) 会议论文 OAI收割
2012 2nd International Conference on Consumer Electronics, Communications and Networks, CECNet 2012, April 21, 2012 - April 23, 2012, Three Gorges, China
Zhang M.-H.; Zhang Y.-Y.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

Mammary gland is composed entirely of soft tissue with approximate density therefore mammary gland CR medicine radiation image presents a low contrast and slight difference changes may be a manifestation of tumor so it is necessary to enhance mammary gland CR image to improve its visual quality in order to meet the demands of doctor's clinical diagnosis. However the general enhancement algorithms over enhance the contrast and noise due to image details lost aiming at the defects a mammary gland CR medicine image adaptive enhancement arithmetic based on image gray entropy is put forward. The arithmetic adapts dizzy image to magnify selected spatial frequency response in order to enhance the edge details of mammary gland CR images. It can adjust weighted factor K according to image gray characteristics namely pixel gray entropy. Experiments results demonstrate that mammary gland CR image enhanced by the algorithm has abundant details and high signal-to-noise ratio moreover CR image enhanced has good visual effect. So the method is effective and fit for enhancing CR medical radiation image edge details. 2012 IEEE.

Correction method for detection of the frequencies of railway fsk signals (EI CONFERENCE) 会议论文 OAI收割
2008 9th International Conference on Signal Processing, ICSP 2008, October 26, 2008 - October 29, 2008, Beijing, China
作者: Yu J.

收藏 | 浏览/下载：63/0 | 提交时间：2013/03/25

In order to acquire the information of railway binary frequency-shift keying signals which include upper/down side frequencies and base low-frequency with high-accuracy a novel frequency detection algorithm for France UM-71 system is proposed. Combining fast Fourier transform with the ratio correction method the carrier frequency and the base frequency are obtained. Furthermore the hardware consumption has been decreased. And it possesses the advantage of simple algorithm and fast operation speed. Comparing with the detection of the base frequency the upper/down side frequency of railway signal is more difficult. Based on spectrum analysis and the spectrum correction a new method which adopts the sliding window is put forward in this paper. The absolute differences between the upper side frequencies and the down side frequencies obtained are regarded as the criterion for judgment. Then the set of data in which the maximum absolute value is is to be the result of the upper/down side frequency. Because the sliding window will go through every stage when the upper/down side frequency changes therefore it is not sensitive enough to the position of data which need to be transformed. Using the method mentioned above the experiment results show that the accuracy requirement of the side frequency is satisfied well. 2008 IEEE.

频谱泄漏对正弦相位调制干涉测量精度的影响何 期刊论文 OAI收割
中国激光, 2007, 卷号: 34, 期号: 7, 页码: 967, 971
何国田; 王向朝; 曾爱军

收藏 | 浏览/下载：1253/157 | 提交时间：2009/09/18

测量正弦相位调制干涉仪频谱泄漏离散傅里叶变换测量精度频率变化 measurement sinusoidal phase modulating interferometer spectrum leakage discrete Fourier transform measurement accuracy frequency changes

Energy transfer processes on both Er+ ion concentration and excitation densities in Yb3+-Er3+ codoped LaF3 matrix (EI CONFERENCE) 会议论文 OAI收割
作者: Zhang J.; Wang Y.; Wang Y.; Wang Y.; Zhang J.

收藏 | 浏览/下载：20/0 | 提交时间：2013/03/25

The effects of both Er3+ ion concentration and excited density upon frequency upconversion fluorescence emissions in Er3+/Yb 3+-codoped LaF3 powder are investigated. The results reveal that a higher Er3+ concentration can induce not only upconversion emission enhancements but also the changes among the relative intensities of the 407 519 539 and 651 nm radiation transitions as the samples are excited within the ranges of 20 to 700 mW with 978 nm laser diode (LD) as an excitation source. The changes are described by a schematic level model with the cross-relaxation processes between Er3+ ions and a series of dynamic equations that take into account the population of temperature dependent in Er3+. 2006 Elsevier B.V. All rights reserved.

Research on LD-Pumped dual wavelength Nd:YAG Laser with high beam quality for machining (EI CONFERENCE) 会议论文 OAI收割
ICO20: Lasers and Laser Technologies, August 21, 2005 - August 26, 2005, Changchun, China
作者:

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

Considering laser medium thermal lens effect and thermal focal length changes with pumping power conventionally lasers are designed to operate in the middle of thermal stable zones where the fundamental mode size is insensitive to thermal perturbation while this method seems impossible when large fundamental mode size is required. Through self-select mode cavity lasers are designed to work at the border of stable zone instead where large fundamental mode size in gain media can be reached. With increase of pumping power and self-aperture mode-selective effect mode size would grow up automatically to a certain value suitable for monomode resonance. With double 180 W pump modules acoustic Q-switch and LBO external frequency-doubled over 28 W which M2 equals 4.5 quasi-CW output green laser and 52W 1.064 um IR output is obtained simultaneity. With the insertion or not of the harmonic separator by footswitch high beam quality green IR and green IR lasers are obtained conveniently.