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近海环境中抗生素分析样品前处理技术的研究进展
期刊论文
色谱, 2020, 卷号: 38, 期号: 1, 页码: 95-103
作者:
吕敏
;
陈令新
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浏览/下载:115/0
  |  
提交时间:2020/07/08
抗生素
近海
前处理技术
综述
antibiotics
coastal
pretreatment techniques
review
The widespread and massive usage of antibiotics for the prevention and treatment of diseases in human and animals have resulted in their continuous discharge into the environment, and finally, into the coastal environment through various pathways. Accumulation of antibiotics in aquatic organisms poses a great threat to ecological and human health, especially because it facilitates the generation and spread of bacterial resistance. Given the diverse range of antibiotics with various features, as well as their presence at low concentrations in the environment, it is imperative to develop pretreatment techniques for antibiotics in various matrices. In this paper, the pretreatment methods proposed in recent decades for antibiotics in coastal water, sediment, and biota are summarized, with emphasis on commonly used methods such as solid-phase extraction, solid-liquid extraction, matrix solid-phase dispersion, and QuEChERS. Additionally, the potential factors influencing the extraction performance and clean-up efficiency are analyzed. The advantages and disadvantages of the methods and their development are finally discussed.
A review on mixture design methods for self-compacting concrete
期刊论文
Construction and Building Materials, 2015, 卷号: Vol.84, 页码: 387-398
作者:
Shi, CJ
;
Wu, ZM
;
Lv, KX
;
Wu, LM
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浏览/下载:1/0
  |  
提交时间:2019/12/31
Self-compacting concrete
Mixture design method
Classification
Advantages and disadvantages
中国科举制度的演变与利弊分析
期刊论文
2013
黄声豪
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  |  
浏览/下载:4/0
  |  
提交时间:2016/05/17
科举制度
选官制度
利弊
the imperial examination system
bureaucracy chosen system
advantages and disadvantages
论格式条款的利用及其综合规制 ——主要以格式保险合同为例
学位论文
2013, 2012
颜钰棚
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  |  
浏览/下载:2/0
  |  
提交时间:2016/02/14
格式条款
利弊
综合规制
format articles
advantages and disadvantages
comprehensive regulation
The design and research for the shaping of the LDA (EI CONFERENCE)
会议论文
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Xu X.
;
Wang L.
;
Zhou M.
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  |  
浏览/下载:12/0
  |  
提交时间:2013/03/25
We analyze the structure defects of the LDA
and compare the coupling mode of the LDA and a fibers array to the coupling mode of the LDA and a single fiber. We also design several new coupling methods of laser and fibers
and discuss the advantages and the disadvantages of them. 2011 IEEE.
A vertex tracking technique based on airborne opticalequipment (EI CONFERENCE)
会议论文
2011 International Conference on Electronics and Optoelectronics, ICEOE 2011, July 29, 2011 - July 31, 2011, Dalian, China
Li Q.
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浏览/下载:12/0
  |  
提交时间:2013/03/25
After analyzing the advantages and disadvantages of photoelectric tracking system withhorizontal gimbal and X-Y double-axis gimbal
a vertex tracking method based on airborne photoelectricequipmenthas been presented. The method
which combines advantages of horizontal gimbal and X-Y double-axis gimbal
can effectively track target in the blind area. experiments show that the tracking method is simple
tracking accuracy is 3
meet the technical requirements. 2011 IEEE.
Analysis of zenith pass problem in a roll-pitch optics seeker (EI CONFERENCE)
会议论文
2011 International Conference on Electronics and Optoelectronics, ICEOE 2011, July 29, 2011 - July 31, 2011, Dalian, China
Jiang H.
;
Jia H.
;
Wei Q.
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浏览/下载:22/0
  |  
提交时间:2013/03/25
There are mainly two kind of structures for a missile two-axes seeker
which is always mentioned as elevate-azimuth and roll-pitch. The elevate-azimuth structured seeker has been studied for a long time
and it is applied in all sort of missiles. Not only structure design but also control algorithm of the elevate-azimuth seeker are deeply developed. But for elevate-azimuth seeker there are several disadvantages such as big size and large abaxial angle blind. So the elevate-azimuth seeker gimbal angle is designed up to 65 according to relative references. In modern air war
it is important for a missile to have the ability of "first recognize" and "first attack". That means the air to air missile seeker is required to be a system with large gimbal angle and large abaxial launch angle. With the mentioned requirement
roll-pitch seeker with its advantages smart size and large gimbal angle is studied widely and deeply. The pitch angle of roll-pitch is up to 90 while its roll angle up to n 360. But there are also some disadvantages for the roll-pitch seeker
the most troublesome one is the zenith pass problem. The zenith pass problem is brought about from the gimbal kinematics
it is said that when target moves in the center of image plane
roll servo command gotten from the kinematics algorithm will go to infinite. Math model of zenith pass problem is proposed in this paper and two ways to solve the problem are brought forward. 2011 IEEE.
中国气候与环境演变评估(Ⅱ):气候与环境变化的影响与适应、减缓对策
期刊论文
2010, 2010
陈宜瑜
;
丁永建
;
佘之祥
;
林而达
;
潘家华
;
周广胜
;
王守荣
;
周大地
;
李从先
;
张建云
;
徐国弟
;
刘春蓁
;
吴宗鑫
;
CHEN Yiyu
;
DING Yongjian
;
SHE Zhixiang
;
LIN Erda
;
PAN Jiahua
;
ZHOU Guangsheng
;
WANG Shourong
;
ZHOU Dadi
;
LI Congxian
;
ZHANG Jianyun
;
XU Guodi
;
LIU Chunzhen
;
WU Zongxin
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  |  
浏览/下载:3/0
Athermalization of coaxial reflective space telescope (EI CONFERENCE)
会议论文
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, April 26, 2010 - April 29, 2010, Dalian, China
Lei Z.
;
Guang J.
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浏览/下载:13/0
  |  
提交时间:2013/03/25
This paper focuses on thermal effects
which caused by environmental temperature changes
on coaxial reflective space telescope and its solution. Curvature radius and center thickness of optical elements
and the space distance between optical elements may be changed by thermal effects. And the optical performance of the telescope may be impacted. Based on the analysis of thermal effects on coaxial reflective space telescope
athermalized design techniques are emphatically presented
the advantages and the disadvantages of the three athermalizations used currently are compared in the paper. The feasibility and effectiveness are verified by an example of a cassegrain space telescope. 2010 Copyright SPIE - The International Society for Optical Engineering.
论省市共建“以省为主”和“以市为主”之利弊----新建地方本科院校管理体制改革研究
学位论文
2010, 2009
黄海群
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  |  
浏览/下载:1/0
  |  
提交时间:2016/02/14
newly-upgraded local universities
management system
advantages and disadvantages
新建地方本科院校
管理体制
利弊
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