Reflections on participatory research   总被引：2，自引：0，他引：2  

Rachel Pain  Peter Francis 《Area》2003,35(1):46-54

Participatory research approaches are increasingly popular with geographers in developed as well as developing countries, as critical qualitative methodologies which at their best work with participants to effect change. This paper adds to recent debates over the methodologies, practices, philosophical and political issues involved. Drawing on a project on young people, exclusion and crime victimization in Newcastle upon Tyne, England, we discuss the limitations of participatory diagramming and illustrate some of the social and political barriers to meaningful participation in, and action from, this type of research.  相似文献   

Young Students' Conceptions of the Marine Environment and Their Role in the Development of Aquaria Exhibits   总被引：1，自引：0，他引：1  

Roy Ballantyne 《GeoJournal》2004,60(2):159-163

Informal learning settings such as aquaria are well-placed to help young students understand the nature and importance of marine environments. In order to achieve this, it is important to incorporate pedagogical principles into exhibit design. Using a constructivist perspective, this paper explores young students' conceptions of the marine environment. The findings indicate that although students are interested in marine life and are familiar with terms such as currents, tides and waves, their understanding of these concepts is limited and confused. It is suggested that by addressing children's limited conceptions in their exhibits and educational programmes, aquaria can foster an understanding of the environmental processes that support marine life, thus contributing to habitat conservation and species survival. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

九寨沟沟谷成因与演化     

万新南  陈叙伦  许模 《山地学报》1994,(3)

本文根据戴维斯流域理论及地史演化特征研究了九寨沟的成因，进而根据水均衡原理及Ｂｕｇｌｉ岩溶理论研究了九寨沟的演化。可以得出结论：九寨沟属流水成因，其演化发展主要受控于长海的断流、水动力条件的变迁及特殊的水化学环境。  相似文献   

光照对真鲷仔、稚、幼鱼摄食的影响   总被引：24，自引：1，他引：24  

李大勇  何大仁  刘晓春 《台湾海峡》1994,13(1):26-31

光照对真鲷（Pagrosomusmojor）仔、稚、幼鱼的摄食有重要影响。摄食的适宜光照度范围为100～102lx，最适光照度范围为101～102lx。103lx强光对仔鱼摄食的影响大于稚、幼鱼；100lx弱光对9d以前的仔鱼和稚、幼鱼的摄食影响较小，对9d以后的仔鱼影响较大。此结果和鱼的感觉器官发育及鱼所摄食的饵料种类有关。  相似文献   

The relationship between sap flow of intercropped young poplar trees (Populus×euramericana cv. N3016) and environmental factors in a semiarid region of northeastern China     

De‐Xin Guan  Xiao‐Jing Zhang  Feng‐Hui Yuan  Ni‐Na Chen  An‐Zhi Wang  Jia‐Bing Wu  Chang‐Jie Jin 《水文研究》2012,26(19):2925-2937

Estimating transpiration of the trees in agroforestry system is important in water management of the site. Sap flow of intercropped fast‐growing young poplar trees and microclimate factors in semiarid northeastern China was measured in two growing seasons (2008 and 2009). Sapwood growth and water storage of wood and leaf increment during the growing season were involved in the calculation of sap flow. The results showed that diurnal variation of sap flow followed to that of short wave solar radiation. Sap flows both in 10 min mean and daily gross values mainly depended on solar radiation and vapor pressure deficit, and the relations well fit hyperbolic function. The regression coefficients of monthly window data indicated that the seasonal variation of sap flow capacities decreased gradually from June to September. Moderate soil water stress of upper soil layer (0–50 cm) did not constrain the sap flow because the trees could use the water at deeper soil layer. The daily sap flow per tree ranged 0.8 to 18.1 and 3.7 to 23.8 kg d^?1 tree^?1, with averages of 8.7 and 14.3 kg d^?1 tree^?1 in 2008 and 2009 respectively. An empirical model was established to estimate the sap flow of the poplar trees by solar radiation, vapor pressure deficit, leaf area index and Julian days. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

pH、底物体积分数和盐度对军曹鱼消化组织淀粉酶活力的影响   总被引：5，自引：0，他引：5  

陈刚  汤保贵  张健东  叶富良  吴灶和 《海洋科学》2005,29(11):28-30

测定了军曹鱼（Rachyceruton canadum）的胃、幽门盲囊、肠等消化组织中淀粉酶在不同pH值下的活力及在最适pH值下底物体积分数、盐度对其活力的影响。结果表明,胃、幽门盲囊、前中肠、后肠的淀粉酶的最适pH值分别是6．0,7．0,5．8和7．0;其最适底物体积分数分别为0．056％．0．056％,0．048％和0.064％;其最适盐度为28。  相似文献   

青年地震工作者在2008年汶川8.0级地震后科技支撑工作中的作用——对青年科技人员教育和培训的评估和讨论     

乔森  张东宁  陈瑶  肖春艳  封长华  刘爱文  陈学良 《国际地震动态》2009,(12):1-6

2008年5月12日汶川8.0级地震发生后,地震科技工作者立即投入到震后应急救援、现场余震监测、灾害评估、地震机理研究、震情趋势判定和现场科学考察中。其中,中国地震局地球物理研究所青年专家在地震精定位、震源机制及数字化地震参数计算、震源破裂过程、地震灾区区划图编制、余震破坏影响范围确定、地震社会学分析与应用等方面发挥了重要作用。截止到2008年12月,研究所40岁以下科技人员在各种科研刊物上发表了SCI、EI文章就有10余篇,参加现场工作人员41人次。青年科技人员能够迅速投入到震后科技支撑工作中,得益于研究所平时对青年科技人员教育和培训工作的重视,本文对此进行了评估和讨论。  相似文献   

试验水槽中多种人工鱼礁模型组合对紫红笛鲷幼鱼的诱集效果   总被引：2，自引：0，他引：2  

周艳波  蔡文贵  陈海刚  陈丕茂  吕国敏  贾晓平 《台湾海峡》2012,31(2):231-237

摸清多种人工鱼礁模型组合对紫红笛鲷幼鱼的诱集效果,可为人工鱼礁礁体组合设计和礁区布局设计等方面提供科学依据.本研究参照深圳杨梅坑人工鱼礁区的实际建礁情况,制作并模拟4组三种模型礁体组合、4组四种模型礁体组合,在方形试验水槽中以鱼类行为学的方法研究了这8组模型礁体组合对紫红笛鲷的诱集效果.4组三礁组合礁体模型试验结果表明,FHJ三礁组合对紫红笛鲷的集鱼效果非常明显,BFH、BCG、CHJ三礁组合对紫红笛鲷的集鱼效果较为明显.其诱集效果排序为:FHJ组合礁(53.84%)>BFH组合礁(44.85%)>BCG组合礁(38.11%)>CHJ组合礁(36.01%).4组四礁组合礁体的试验结果表明,4组四礁组合礁体模型对紫红笛鲷均具有较强的诱集效果,其诱集效果排序为:BGHJ组合礁(52.27%)>CFHJ组合礁(51.26%)>BCGJ组合礁(50.01%)>BCGH组合礁(45.05%).总体上,四礁组合的诱集效果优于三礁组合,人工鱼礁建设的礁群配置以多礁组合为佳.  相似文献   

Evolutionary studies of the young star clusters: NGC 1960, NGC 2453 and NGC 2384     

Priya Hasan  G. C. Kilambi  S. N. Hasan 《Astrophysics and Space Science》2008,313(4):363-371

We report the analysis of the young star clusters NGC 1960, NGC 2453 and NGC 2384 observed in the J (1.12 μm), H (1.65 μm) and K′ (2.2 μm) bands. Estimates of reddening, distance and age as E(B?V)=0.25, d=1380 pc and t=31.6 to 125 Myr for NGC 1960, E(B?V)=0.47, d=3311 pc and t=40 to 200 Myr for NGC 2453 and E(B?V)=0.25, d=3162 pc and t=55 to 125 Myr for NGC 2384 have been obtained. Also, we have extended the color–magnitude diagrams of these clusters to the fainter end and thus extended the luminosity functions to fainter magnitudes. The evolution of the main sequence and luminosity functions of these clusters have been compared with themselves as well as Lyngå 2 and NGC 1582.  相似文献   

军曹鱼全人工繁殖群体遗传特征的SSR分析   总被引：2，自引：1，他引：1  

王中铎  陈铁妹  郭昱嵩  罗杰  刘丽  刘楚吾 《广东海洋大学学报》2010,30(3):16-21

利用8个微卫星DNA位点分析南海海域5个军曹鱼全人工繁育群体(HN1、HN2、ZJ、FJ和LS)子代的遗传多样性特征和群体间遗传分化。结果显示,军曹鱼养殖群体与天然群体的遗传结构特征基本一致:1)平均有效等位基因数为3.910±0.440,观测杂合度为0.595±0.049,分子方差分析(AMOVA)表明,个体内分化占主导(46%),军曹鱼养殖群体整体遗传多样性较高;2)群体间基因流明显(N_m=2.5959,F_(st)=0.0878),整体分化程度较低。各养殖群体表现出不同于天然大群体的特征:1)绝大部分位点均明显偏离哈温平衡,杂合子缺失或过剩现象普遍存在;2)聚类和群体分配分析等表明HN2与另四个养殖群体(HN1、ZJ、FJ和LS)分化明显。  相似文献