中国科学院机构知识库网格系统: 检索

浏览/检索结果: 共6条，第1-6条

帮助

条数/页：排序方式：
	Effects of Organic Amendments with Different C/N Ratios and Application Rates on N Mineralization-Immobilization in Calcareous Cropland Soil 期刊论文 OAI收割 AGRONOMY-BASEL, 2025, 卷号: 15, 期号: 12, 页码: 13 作者: Hu, Yangmei; Zhu, Bo \| 收藏 \| 浏览/下载：1/0 \| 提交时间：2026/01/22 nitrogen dynamic changes organic residues C/N ratios input rates
	Effects of litter and root inputs on soil CH₄ uptake rates and associated microbial abundances in natural temperature subalpine forests 期刊论文 OAI收割 SCIENCE OF THE TOTAL ENVIRONMENT, 2024, 卷号: 912, 页码: 13 作者: Xiong, Jia; Wang, Genxu; Sun, Xiangyang; Hu, Zhaoyong; Li, Yang \| 收藏 \| 浏览/下载：101/0 \| 提交时间：2024/03/25 Soil CH4 uptake rates Methanotroph Methanogen Detritus input manipulations Subalpine forests
	Reconstruction of historical lead contamination and sources in Lake Hailing, Eastern China: a Pb isotope study 期刊论文 OAI收割 ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 2016, 卷号: 23, 期号: 9, 页码: 9183-9191 作者: Zhang, Rui; Guan, Minglei; Shu, Yujie; Shen, Liya; Chen, Xixi 收藏 \| 浏览/下载：57/0 \| 提交时间：2016/09/21 Anthropogenic input Lead isotopes Lake sediments Sediment accumulation rates Source identification
	Polycyclic aromatic hydrocarbons (PAHs) and Pb isotopic ratios in a sediment core from Shilianghe Reservoir, eastern China: Implying pollution sources 期刊论文 OAI收割 APPLIED GEOCHEMISTRY, 2016, 卷号: 66, 期号: 2016, 页码: 140-148 作者: Zhang, Fan; Zhang, Rui; Guan, Minglei; Shu, Yujie; Shen, Liya 收藏 \| 浏览/下载：36/0 \| 提交时间：2016/05/03 Anthropogenic input PAHs Lead isotopes Reservoir sediments Sediment accumulation rates Source identification
	Three-sample rotation vector algorithm with angular rate input (EI CONFERENCE) 会议论文 OAI收割 2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011, July 15, 2011 - July 17, 2011, Inner Mongolia, China 作者: Zhang Y. 收藏 \| 浏览/下载：41/0 \| 提交时间：2013/03/25 In order to research the attitude algorithm with angular rate input under the conical motion a optimal threesample rotation vector algorithm based on single-step Newton backward interpolation is proposed. Using the principle of limited rigid body rotation and the characteristic of angular rate input three-sample rotation vector algorithm is derivated. To minimum attitude errors three-sample rotation vector algorithm is optimized. Three angular rate extraction methods of singlestep entire sample recursion multi-step entire sample and singlestep Newton backward interpolation are proposed. Under the condition of conical motion with semi-cone angle 3 and angular frequency 2rad/s simulation is done. The simulation results show that single-step Newton backward interpolation is superior to the other two methods and its maximum error peak is 0.01 error drift rate is 0.036/h. Experiments in three-axis flying turntable with the same parameters are carried out and the results show that error drift rates of three-channels are less than those of traditional quaternion which are 13.53% 12.08% and 23.68% lower respectively. It also verified that the new algorithm can perform a high accuracy under the conical motion. 2011 IEEE.
	Lossless wavelet compression on medical image (EI CONFERENCE) 会议论文 OAI收割 4th International Conference on Photonics and Imaging in Biology and Medicine, September 3, 2005 - September 6, 2005, Tianjin, China 作者: Liu H.; Liu H.; Liu H. 收藏 \| 浏览/下载：66/0 \| 提交时间：2013/03/25 An increasing number of medical imagery is created directly in digital form. Such as Clinical image Archiving and Communication Systems (PACS). as well as telemedicine networks require the storage and transmission of this huge amount of medical image data. Efficient compression of these data is crucial. Several lossless and lossy techniques for the compression of the data have been proposed. Lossless techniques allow exact reconstruction of the original imagery while lossy techniques aim to achieve high compression ratios by allowing some acceptable degradation in the image. Lossless compression does not degrade the image thus facilitating accurate diagnosis of course at the expense of higher bit rates i.e. lower compression ratios. Various methods both for lossy (irreversible) and lossless (reversible) image compression are proposed in the literature. The recent advances in the lossy compression techniques include different methods such as vector quantization wavelet coding neural networks and fractal coding. Although these methods can achieve high compression ratios (of the order 50:1 or even more) they do not allow reconstructing exactly the original version of the input data. Lossless compression techniques permit the perfect reconstruction of the original image but the achievable compression ratios are only of the order 2:1 up to 4:1. In our paper we use a kind of lifting scheme to generate truly loss-less non-linear integer-to-integer wavelet transforms. At the same time we exploit the coding algorithm producing an embedded code has the property that the bits in the bit stream are generated in order of importance so that all the low rate codes are included at the beginning of the bit stream. Typically the encoding process stops when the target bit rate is met. Similarly the decoder can interrupt the decoding process at any point in the bil stream and still reconstruct the image. Therefore a compression scheme generating an embedded code can start sending over the network the coarser version of the image first and continues with the progressive transmission of the refinement details. Experimental results show that our method can get a perfect performance in compression ratio and reconstructive image.