oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2019 ( 7 )

2018 ( 12 )

2017 ( 8 )

2016 ( 336 )

自定义范围…

匹配条件: “<br>陈峰” ,找到相关结果约384576条。
列表显示的所有文章,均可免费获取
第1页/共384576条
每页显示
Chemical Compositions and Pharmacological Action of Acorus
菖蒲属植物的化学成分及药理作用

Chen Feng,<br>
世界科学技术-中医药现代化 , 2011,
Abstract: Acorus is a commonly used traditional Chinese medicine with a variety of pharmacological and physiological role. Acorus contains a lot of compositions such as monoterpenes, sesquiterpenes, phenylpropanoids, quinones,alkaloids, organic acids, amino acids, sugars and etc. In this paper, chemical compositions and pharmacological actions of Acorus plants were discussed to provide proof for further research and development of Acorus.
ON EXPLOITATION AND THE STRATEGY OF MARINE EDIBLE ORGANISM RESOURCES IN CHINA
我国食用海洋生物资源的开发及其对策

Chen Feng,<br>
自然资源学报 , 1988,
Abstract: After a brief introduction to the resource organisms in the China Sea, the author made aa overview on the history of exploitation of the organism resources. It was pointed out that the harvest yield had increased greatly with the increase of fishing intensity before the middle 1970's, however, since then, the amount of yield has decreased, in spite of still growing catch, intensity. The reasons causes for this discrepancy are over-exploitation of conventional fishery resources in the shallow shelf areas, pollution (mainly oil pollution in the coastal waters), and others, such as changes in environmental variables and red tides, among which the influence of the first is much greater than that of the other two. The following would be suggested for the better use of the resources:1)Make further study on marine ecosystems, which would greatly contribute to the rational exploitation and the management of the resources.2)Paff attention to resources off the coastal waters of the China Sea, in which the fishery stress on heavily exploited resources would be diminished and a stabilized fishery would be mainlained.3)Practise farming and ranching of the sea, especially multiplying some organisms in the lower trophic levels of marine food chain, which would also speed up recovery of the collapsed resources.
AMPLITUDE AND ANISOTROPY OF APPARENT RESISTIVITY CHANGE IN BIG MODELS DURING SHEAR AND FRICTIONAL SLIPPING
剪切和摩擦滑动大模型的视电阻率变化幅度和各向异性

CHEN FENG,<br>
地球物理学报 , 2003,
Abstract: 用石英砂、河砂和水泥模压制成 1m× 1m× 0 .3m的均匀和非均匀介质模型 ,对模型进行剪切和摩擦滑动实验 ,观测模型不同位置和不同方位的视电阻率变化幅度和各向异性特征 .均匀介质模型实验结果为 :电阻率变化与测线的位置有关 ,距裂隙近的测线 ,电阻率变化幅度大 ,从百分之几到百分之几十 ;距裂隙远的测线 ,电阻率变化幅度小 ,从百分之几到不变 .对于非均匀介质模型 ,电阻率变化幅度要小一些 ,最大也只有百分之几 .电阻率变化除与测线的位置有关外 ,还与测线的方位有关 ,同一测点不同方位的测线 ,电阻率变化幅度不同 ,有的差别很大 .剪切与摩擦滑动两种加载方式的电阻率变化幅度数量级相同 .裂隙穿过部位及其附近测点的电阻率变化各向异性主轴方位解与剪切和摩擦滑动的实际裂隙方位吻合较好 .
DIRECTIONAL CHARACTERISTIC OF RESISTIVITY CHANGES IN ROCK OF ORIGINAL RESISTIVITY ANISOTROPY
原始电阻率各向异性岩石电阻率变化的方向性

CHEN FENG,<br>
地球物理学报 , 2003,
Abstract: Multiple electrodes are arranged on the surfaces of samples, which include three kinds of resistivity of anisotropic samples not formed by ingredient of rock (The original resistivity anisotropy of the samples is due to the integrity of samples be damaged in the process of sampling and processing) and a kind of samples formed by ingredient of rock. The samples are fully saturated with water. The multiple electrodes are combined form arrays of resistivity changing anisotropy in different direction and spacing. The experiments of dynamic rock resistivity change are done with uniaxially compression, low confining pressure and shear. The variations of resistivity during the whole loading process are observed. The experimental results are the following: The samples of original resistivity anisotropy are essentially accordant with the samples of original resistivity isotropy in resistivity changing anisotropy. Namely, for the measuring-points located at cracks or rupture bands, the results of resistivity changing anisotropy are good, the four directions deduced from four kinds of combinatorial equation sets of resistivity are essentially identical with each other and approximately coincide with the orientation of cracks or main rupture bands; for the measuring-points without cracks or rupture bands passing through, the four directions calculated by different combinatorial arrays of resistivity are inconsistent with each other, or the direction can not be determined, especially in the cases when the crack plane is parallel to the measuring-surface.
Ecohydrological effect of tropical mountain rainforest in Jianfengling,Hainan,China
尖峰岭热带山地雨林生态系统的水文生态效应

CHEN Bu,<br>
生态学报 , 2000,
Abstract: According to the comparison research of 3 watershed of tropical mountain rain forest in Jianfenling,nature recovery raniforest ecosystem with 40 years could store 51.8% of rainfall from May to September, and could recruit runoff of 143.5 mm from October to February. At the same time,the response of runoff ranged from 32.7% to 62.5% on heavy rainstorm.Concentration of COD,NH 4 N,phenol,Zn,Cu,Pb,Cd,Ni in precipitation and runoff were lower than the first standard of area water environment in virgin and nature recovering rain forest watershed.And by water cycling,the concentration of NH 4 N,phenol,Pb,Cd,Zn by rainfall input could be cut down by 23.7%,14.1%,16.3%,25.5%,32.3%,respectively;and 47 2%,40 6%,42 1%,48.2%,and 91.8% of that by rainfall input was effectively stored in the mountain rainforest meanwhile.In the heavy storm process,input output of microelement has marked changes including that the input of Cu,Pb was stored by 66.4%,50.3% respectively,and concentration of Cd was decreased by 92.9% after the peak flood;concentration of Zn was decrease range from 49% to 77.8% with all process.comparing the measurement between the nature recovering and Fir young forest system from 1996 to 1997,It has been found that the former could decrease loss of sand and nutrients with 6.01 t/hm 2 and 245.1 kg/hm 2 than that of the latter per year as influence of typhoon and super storm.Otherwise the former only decreased loss of sand and nutrients by 0.43 t/hm 2 and 17.1 kg/hm 2 respectively than that of the latter per year.
Research on Impacts of Global Climate Change to Holdridge''s Life Zones of China by Geo-information System
GIS支持的全球气候变化对中国Holdridge生命地带的可能影响研究

Chen Yufeng,<br>
遥感学报 , 1997,
Abstract: 该文以地理信息系统为支持手段 ,根据Holdridge气候—植被生命地带的分类体系 ,首先研究了在目前气候条件下中国Holdridge生命地带空间分布的基本格局 ;然后采用GFDL、GISS、OSU3个GCMs模拟的 2×CO2 情景下的气温和降水作为未来气候条件 ,揭示了 2×CO2 情景下中国Holdridge生命地带在空间分、面积以及海拔高度等方面的变化
Establishment of rapid screening techniques for shade-tolerant rice(Oryza sativa L )
耐阴水稻种质资源的快速筛选技术研究

Chen,Yifeng,<br>
中国生态农业学报 , 1997,
Abstract: 阴害直接限制了水稻高产潜力发挥。建立快速筛选耐阴水稻种质资源的技术对利用耐阴种质、选育耐阴品种具有重要意义。以中粳02428、南粳35、中籼苏农3037为材料对各种筛选指标进行了比较研究,结果表明水稻苗期黑暗下保绿能力与弱光驯化下同期的叶片干重、叶绿素含量变化,同分蘖-拨节期的叶绿素含量、净光合速率变化以及与瞬时弱光照下的净光合速率下降相一致。此指标鉴定水稻苗期黑暗下保绿能力简单方便,故可用于建立耐阴种质快速筛选技术。
RESEARCH ON RESPONSES OF VEGETATION TO CLIMATE CHANGE
自然植被对气候变化响应的研究:综述

Chen Yufeng,<br>
地理科学进展 , 1997,
Abstract: More attentions have been attracted to the relationship between vegetation and climate by geographers, ecologists, which has been listed one of core projects of IGBP. In this paper, the main progresses of researches on responses of vegetation to climate change are reflected from the three temporal scales of past, current and future, especially, the basic regimes of impacts of future climate change to vegetation are set forth.
A PRELININARY DISCUSSION ON PERIODICAL CORRESPONDENCE BETWEEN CLIMATE AND CELESTIAL ACTIVITIES AND ITS REGIONAL CHARACTERISTICS
气候周期与天体活动周期的对应性及其区域特征的初步探讨

Chen Yufeng,<br>,张强
地理研究 , 1995,
Abstract: Baed on the study of deven authentic works and induction of the periodcal linkage be-tween climate and celestial activities,this paper discusses the correspondence between climate and celestial activities and its regional characteristics,It is pointed out that(1)there is a close periodical correspondence between climate and celestial activities;(2)there are strong regional characteristics in both the impacts of celestial activities on earth climatic system and the responsis of regional climate to celestial activities.
Study on the CO_2 grads and flux in near canopy layer of tropical mountain rainforest at Jianfengling, Hainan Island
海南尖峰岭热带山地雨林近冠层CO_2及通量特征研究

CHEN Bu-Feng,<br>
生态学报 , 2001,
Abstract: Carbon dioxide and its flux with water and heat exchanging was studied by means of the gradent observation and outline methods in near canopy layer of tropical mountain rainforest for three years. The results were as follow: At fine, cloudlet and cloud weather in rainy season,the mean value of CO 2 content varied in a range of 349 to 350ml/m\+3 at 2.8m above the canopy, 346 to 348ml/m\+3 at 0.8m above the canopy, 345 to 349ml/m\+3 at 16m inner the forest and 352 to 357ml/m\+3 at 5m above ground in the per...
第1页/共384576条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.