نتایج جستجو برای: sand

تعداد نتایج: 28228  

2010
Xiaobing Lu Xuhui Zhang Zhongmin Shi

In this paper we investigated the responses of saturated sand under horizontal vibration loading induced by a bucket foundation. It is shown that the saturated sand liquefies gradually since the vibration loading is applied on. The maximum displacement on the surface of sand layer occurs near the loading end and in this zone the sand is compressed and moves upwards. The liquefaction zone is dev...

2012
Charles H. Fletcher

We analyzed patterns of sand deposit distribution on the reef platform, and documented relationships between sand deposits and reef morphology. Sand deposit patterns, the surrounding morphology, and the environments they are located in are best understood using a combination of statisitics, GIS software, spatial analysis tools, and analyst interpretation. The work consisted of several steps inc...

2005
Yulin LI Douglas A. JOHNSON Yongzhong SU Jianyuan CUI Tonghui ZHANG

We investigated the variations in specific leaf area (SLA) and leaf dry matter content (LDMC) of 20 species (10 annuals and 10 perennials) that have different distributional patterns in the Kerqin Sandy Land in northern China. The main purpose of our study was to determine if SLA and/or LDMC could be used as indicators of plant resource-use strategy in sand dune environments. The selected speci...

2015
Jiachen Zhang Yuqing Zhang Dongqing Fan Shugao Qin Xin Jia Bin Wu Dong Chen Hao Gao Linfeng Zhu Christopher J. Lortie

Vegetation patterns are strongly influenced by sand mobility in desert ecosystems. However, little is known about the spatial patterns of Artemisia ordosica, a dominant shrub in the Mu Us desert of Northwest China, in relation to sand fixation. The aim of this study was to investigate and contrast the effects of sand dune stabilization on the population and spatial distribution of this desert s...

زارعی , حسین , شکری, صدیقه , علیزاده, مهدی ,

The current experiment was carried out to study the effect of several media including sand, sand+cocopeat, sand+perlite, cocopeat+perlite and sand+cocopeat+perlite on rooting quality of stem cuttings in weeping bottlebrush plant (Callistemon viminalis). The study was done during the late August of 2010. Statistical design was completely randomized with three replications. After wounding the bot...

Journal: :Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering 2003
C H Ni J N Chen Y C Tsai T K Chen W B Chen C H Chen

In this study, the pilot apparatus combined with sand filtration, ozonation and ultrafiltration was established. Wastewater from the secondary treatment effluent in the new-developed community was taken as the sample for looking into the feasibility of domestic wastewater reuse and recycling. The test results by sand filtration, sand filtration/ultrafiltration, sand filtration/ozonation, and sa...

2007
Adrienne L. Pappal Daniel G. MacDonald Rodney A. Rountree

Juvenile winter flounder utilize a wide variety of habitats, including those that are structurally complex. We investigated the habitat preferences of age-0 winter flounder in sand and cobble of varying complexity in the laboratory. Fish were observed every half hour for six hours in tanks with four cobble treatments; bare sand, sand with low complexity cobble, sand with intermediate complexity...

2014
GU Yan ZHANG Ying Li Huan Haijun Huang Renshun Zhang Yongxue Liu Haiyu Li Jun Chen

Present study took into account the relationship between surface soil moisture of intertidal zone and its spectral reflectance and the relationship between surface soil moisture and the relative elevation of intertidal zone to extract ‘ridges’. It can represent the main morphological character of radial sand ridges, and find specific spectral bands to diagnose much ‘drier’ points of sand ridges...

This study aims to identify favorable oil–gas reservoir facies in the Chishan group of the Wubao fault zone (Gaoyou sag, Subei basin, China) using the methods of outcrops and cores observation, granularity analysis, scanning electron microscope, log data, etc. The results suggest that the Chishan group in the studied area mainly develops desert sedimentary system, and contains five kinds of fac...

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