中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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CAS IR Grid
机构
长春光学精密机械与物... [3]
地理科学与资源研究所 [2]
生态环境研究中心 [2]
广州地球化学研究所 [1]
采集方式
OAI收割 [8]
内容类型
期刊论文 [5]
会议论文 [3]
发表日期
2024 [1]
2021 [4]
2010 [2]
2006 [1]
学科主题
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Microplastic pollution differences in freshwater river according to stream order: Insights from spatial distribution, annual load, and ecological assessment
期刊论文
OAI收割
JOURNAL OF ENVIRONMENTAL MANAGEMENT, 2024, 卷号: 366, 页码: 11
作者:
Luo, Weikeng
;
Fu, Hongyu
;
Lu, Qiyuan
;
Li, Bowen
;
Cao, Xue
  |  
收藏
  |  
浏览/下载:15/0
  |  
提交时间:2024/09/13
Microplastic
Stream order
Catchment
River pollution
Responses of anaerobic digestion of waste activated sludge to long-term stress of benzalkonium chlorides: Insights to extracellular polymeric substances and microbial communities
期刊论文
OAI收割
SCIENCE OF THE TOTAL ENVIRONMENT, 2021, 卷号: 601, 页码: -
作者:
He, Zhang-Wei
;
Liu, Wen-Zong
;
Tang, Cong-Cong
;
Liang, Bin
;
Zhou, Ai-Juan
  |  
收藏
  |  
浏览/下载:17/0
  |  
提交时间:2022/01/04
Dynamic Land Ecosystem Model (DLEM)
Global change
Mid-Atlantic Region
Stream order
Water temperature
Headwater stream ecosystem: an important source of greenhouse gases to the atmosphere
期刊论文
OAI收割
WATER RESEARCH, 2021, 卷号: 190, 页码: 9
作者:
Li, Mingxu
;
Peng, Changhui
;
Zhang, Kerou
;
Xu, Li
;
Wang, Jianming
  |  
收藏
  |  
浏览/下载:43/0
  |  
提交时间:2021/06/10
Riverine GHG emissions
Stream order
Headwater stream oxygen level
Carbon/Nitrogen input
Headwater stream ecosystem: an important source of greenhouse gases to the atmosphere
期刊论文
OAI收割
WATER RESEARCH, 2021, 卷号: 190, 页码: 9
作者:
Li, Mingxu
;
Peng, Changhui
;
Zhang, Kerou
;
Xu, Li
;
Wang, Jianming
  |  
收藏
  |  
浏览/下载:15/0
  |  
提交时间:2021/06/10
Riverine GHG emissions
Stream order
Headwater stream oxygen level
Carbon/Nitrogen input
Contrasting stream water temperature responses to global change in the Mid-Atlantic Region of the United States: A process-based modeling study
期刊论文
OAI收割
JOURNAL OF HYDROLOGY, 2021, 卷号: 601, 页码: -
作者:
Yao, Yuanzhi
;
Tian, Hanqin
;
Kalin, Latif
;
Pan, Shufen
;
Friedrichs, Marjorie A. M.
  |  
收藏
  |  
浏览/下载:11/0
  |  
提交时间:2021/12/21
Dynamic Land Ecosystem Model (DLEM)
Global change
Mid-Atlantic Region
Stream order
Water temperature
Design of multispectral remote sensing image compression system (EI CONFERENCE)
会议论文
OAI收割
2010 International Conference on Computer Application and System Modeling, ICCASM 2010, October 22, 2010 - October 24, 2010, Shanxi, Taiyuan, China
作者:
Xu S.-Y.
收藏
  |  
浏览/下载:19/0
  |  
提交时间:2013/03/25
In order to get the higher compression quality of multispectral remote sensing image
which taken the JPEG2000 as the standard
used FPGA and special compression chip ADV212 to realize the remote sensing image compression system is proposed. The system used the specialty compression chip ADV212 which is newly relaesed by Analog Device company. It used to develop fast high-quality compression for the large amount of remote sensing image data. The system realized the image data's input
the compression stream's output
the image preprocessing as well as to control the ADV212 chip's working pattern through FPGA. The experiment result shows that this system which has such characteristics as low power consumption. low cost and easy adjustmen and has a good compressing effect. Meet the requirement of the multispectral remote sensing image's high compression ratio. 2010 IEEE.
Optical transmission system based on 10GBASE-X (EI CONFERENCE)
会议论文
OAI收割
2010 3rd International Conference on Advanced Computer Theory and Engineering, ICACTE 2010, August 20, 2010 - August 22, 2010, Chengdu, China
作者:
Gao S.-J.
收藏
  |  
浏览/下载:26/0
  |  
提交时间:2013/03/25
In order to further enhance the bandwidth of the data communication system in theodolite
The whole design of the PMD is realized by using Xenpak optical module. Its duty is responsible for converting 4-channel parallel 3.125Gbps data stream into a serial 10.3126Gbps data stream
a single channel serial optical transmission system was designed based on the studying of the 10BASE-X Gigabit Ethernet physical layer technology which meets the IEEE standard. The conversion between the 64-bit 156.25MHz TTL signals and the 4 channel 3.125Gbps PCML differential signals is carried out by FPGA
and sending out it in the form of light signals. The experimental results show that data transmission capacity was achieved a 10Gbps in the single-channel optical transmission system. It can conduct short distance transmission. The system delay is about 31lns. The bit error rates no more than 10-12
which satisfies the system demand. 2010 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:37/0
  |  
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.