Current Issue

Previous Issue | Next Issue

November 15,2013
Volume 6,Issue 21
Pages -
Subject Area:Computational Geophysics,Cartography,Exploration Geophysics,Human Geography (including Regional Grography, Tourism Geography, other Subjects),Biogeochemistry,Atmospheric Sciences

Title:

Authors:
PP:
Abstract:
Keywords:

Title: Parallel computing of wave equation numerical modeling based on the OpenMP+SIMD technique

Authors: CAO Danping
PP: 2104-2109
Abstract: The large scale parallel computing is very important in the seismic exploration industry and scientific research, which is a very professional skill for the message passing intexface (MPI) or graphic processing unit (GPU) programming. The small scale parallel computing problem is considered as an example in this paper, two parallel computing methods are combined to improve the compute efficiency. The OpenMP method that supports the multithread parallel computing is used to manage the multicore resources of the CPU, the single instruction multiple data (SIMD) method that supports the data parallel computing is used to compute more data with a single CPU instruction. OpenMP and SIMD are combined together to compute the wave equation parallel, the cycle characteristics of wave equation in time step and space step are considered. The model tests show that the parallel computing method of OpenMP+SIMD improves the compute efficiency significantly, the speedup of dual core processor is up to 6, which is very important to enhance the large scale parallel computing.
Keywords: computational geophysics; wave equation; numerical modeling; multicore parallel computation; single instruction multiple data

Title: Design and implementation of GIS system for Chongming wetland carbon source/sink calculation

Authors: ZHANG Shiqiang, ZHAO Benfu, LI Peng, XU Jianhua
PP: 2097-2103
Abstract: Based on visual studio 2008 development platform, using ArcEngine repeated development technology, through the analysis of the need of Chongming wetland carbon management, Chongming wetland carbon source/sink simulation system is established. This system can be used to query and manage spatial data and relational data, simulate the data of carbon source/sink, draw the thematic maps and express the data in visualization. This paper makes a successful exploration for the combination of geographic information system (GIS) and wetland ecosystem carbon research.
Keywords: geographic information system; language integrated query; carbon source/sink; geocomputation; component object model

Title: Acoustic respond to crustal stress and its computation

Authors: XU Jingling
PP: 2090-2096
Abstract: The correlation between the acoustic velocity and the rock mechanics parameter, the elastic modulus and Poisson ratio was induced based on the rock s mechanics properties and dynamics equation, and the response of the crustal stress on the acoustic wave difference was also obtained. A new module, which was founded with the reference of some precedent, was used to estimate the largest value of the crustal stress. Consequently, this method was applied to analysize structural reservoirs in the high stress concentration area, and the relationship between the distribution of the pool and the crustal stress was discussed. This method is valuable in deteminating the distribution of hydrocarbon accumulation and the choice of the parameter during the drilling.
Keywords: earth exploration and information technology; crustal stress; elastic modulus; Poisson ratio; wave difference

Title: Dynamic evaluation of land ecological security based on DPSIR model: a case study on Jingchuan county of Gansu province

Authors: PANG Jiaxing, CHEN Xingpeng, WANG Huiy
PP: 2083-2089
Abstract: According to Jingchuan county land ecological status, using driving force-pressure-status-influence-response (DPSIR) model establishment 5 rule layer and 23 indexes to assess land ecological safety, adopting analytic hierarchy process (AHP) and entropy-weight method to determining the evaluation weight of index, calculation the various of criteria comprehensive evaluation index, comprehensive evaluation land ecological security of Jingchuan county. Analysis display: Jingchuan county land ecological security increasing from 0.370 804 in 2001 to 0.733 434 in 2011, ecological security level changing from “sensitive” status to “safety” state dynamic change process; Jingchuan county the ecological safety can be divided into 4 stages in the last 11 years. Each criterion layer response value play a crucial role in the land ecological security state.
Keywords: human geography; ecological safet; comprehensive weight; driving force-pressure-status-influence-response; Jingchuan county

Title: Mechanism of industrial relocation triggered by environmental pressures

Authors: HUANG Gengzhi, XUE Desheng
PP: 2076-2082
Abstract: Through the study on the case of Guangzhou Cement Corporation, this paper argues that a variety of stake-holders, such as the community residents, media institutions, municipal representative of National People s Congress and local government, play different roles in contributing to the relocation of the polluting corporation under multiple environmental pressures. The complaint by residents and its public effect under the help of media institutions strengthen the pressures from social and offcial fields on the corporation which is forced to make environmental responses. The municipal representative plays a critical role by supervising and urging local government to carry out the relocation project. The government, with comprehensive condisration of social and political pressures and potential benefits embedded in the relocation project, plays the role of guidance and coordination in contributing to the industial relocation. The question of how to encourage different stake-holders to come into playing is therefore important for the development of environmentally friendly corporations, implementation of environmental policy and construction of the low-carbon city.
Keywords: human geography; environmental pressure; environmental response; industrial relocation

Title:

Authors:
PP:
Abstract:
Keywords:

Title: Distribution of heavy metals species in the sediment of Xiaruyue reservoir and its dependence on the grain size

Authors: LU Chao, MENG Yaobin, HE Shouliang
PP: 2055-2065
Abstract: As a representative reservoir receiving mineral loadings in semi-humid/semi-arid region, Xiaruyue reservoir in the upstream of Hutuo river basin was sampled to investigate the distribution of heavy metals species. The content of the different species of six heavy metals (Cu, Pb, Zn, Cr, Ni, Fe) was analysized. The results showed that the carbonate-bound species (except Cr), the organic-bound species as well as the total concentration of the heavy metals were considerably higher in the surface sediment layer than those below. With the grain size distributions of the sediment samples as descriptors, linear model was used to describe the dependence of heavy metal concentration, viz, the total value or the species-specific value. The optimized models highlighted two grain size ranges, viz, 5-50 μm and 75-100 μm, which contributed highly to the carbonate-, Fe-Mn-oxide-, organic-bound species of Cu, Zn and Pb. These two grain size ranges coincided respectively with the size distribution of gold mining and iron mining tailing grains, implying that grain size played a critical role in determining the concentration of heavy metals in reservoir sediments in semi-humid/semi-arid region.
Keywords: natural disaster; heavy metal speciation; sediment; reservoir; grain size

Title:

Authors:
PP:
Abstract:
Keywords:

Title: Application of particle size analysis in grainstone

Authors: HAN Chao, HAN Zuozhen, ZHAO Wenlong, GUO Zhiping
PP: 2041-2045
Abstract: In order to test whether particle size analysis could be used in the study of grainstone, this paper studies the field and microscopic characteristics of one sparry calcarenite layer in Shandong Jining Zhangxia group, as well as its upper and lower strata. We find that the target strata has a good sorting and psephicity with cross-bedding and sparry cementation. We regard its depositional environment as high-energy grain shoal in subtidal, which is consistent with the result of grain shoal based on particle size analysis. Therefore, the particle size analysis could be applied to the study of grainstone.
Keywords: sedimentology; particle size analysis; depositonal environment; calcarenite; grain shoal facies

Title: Erupted characteristics and time of the volcanic rocks of the 3rd member of the Yingcheng formation in the northern Songliao basin: a case study from the well Xushen 1-2

Authors: ZHANG Fengqi, CHEN Hanlin, YU Xing, PANG Yanming
PP: 2025-2040
Abstract: The well Xushen 1-2, located in northern Songliao basin, has the longest length of cores and highest recovery rate in drilling of the Yingcheng volcanics. Volcanic petrography and facies and dating studies have been conducted on the cores of Xushen 1-2. This study showed that this volcanic succession was composed of rhyolitic volcaniclastic rocks and rhyolites, which had experienced the erupted process of explosion, overflowing and re-explosion. Dating results indicated that all the volcanic rocks formed at the period of 109～113 Ma in the early Cretaceous, which is considered to be the last large-scale acidic volcanic activity in the Songliao basin during the late Mesozoic time.
Keywords: volcanology; volcanic erupted characteristics; zircon SHRIMP U-Pb dating; Yingcheng formation; Songliao basin

Title: Assessment on numerical simulation of climate change in the Yangtze River basin based on the ECHAM5 and CCLM models

Authors: ZHANG Jie, JIANG Tong
PP: 2017-2024
Abstract: The simulative ability of the European Centre-Hamburg model version 5/Max Planck Institute Ocean Model (ECHAM5/MPI-OM) and COSMO model in Climate Mode (CCLM) climate models in the Yangtze river basin was assessed based on the simulated temperature and precipitation data for 1961 to 2000 and was further verified by the drought event ever happened in 1978. The results showed that both models could capture the spatial distribution pattern of annual averaged temperature in the Yangtze, but CCLM model could reproduce the warming period in the 1980s. The spatial distribution of annual precipitation simulated by ECHAM5 models was obviously different from observed facts and there was an unrealistic rainfall center in the simulation result. However, temporal and spatial distribution characteristics of precipitation could be described by CCLM model comparatively well. Besides, CCLM model also captured the main drought period and 3 rainfall areas during the extreme weather event in 1978. In a summary, the CCLM climate model is more suitable for simulation of climate change in the Yangtze river basin.
Keywords: atmospheric science; Yangtze river basin; simulation of climate change; CCLM model

Title: Analysis of the relationship between air pollutants and meteorological condition in Shanghai

Authors: CHEN Bin, WANG Shigong, SHANG Kezheng
PP: 2008-2016
Abstract: The measured data of PM10, SO2, NO2 and meteorological data of Shanghai city from 2001 to 2011 were summarized and analyzed. The annual and monthly changing characteristics of the three pollutants in Shanghai city were addressed at the same time. The influence of precipitation, wind direction and wind speed on the PM10, SO2 and NO2 were discussed. The results showed that the air quality of Shanghai city had been improved in recent years, air pollution occurred mainly in the winter and spring, relatively, air quality was better in summer and autumn. The concentration of PM10, SO2 and NO2 were strongly affected by precipitation and wind, the removal capacity of snowfall on PM10, SO2 and NO2 was better than rainfall, and the moderate snow removal ability was the strongest, the concentration of PM10, SO2 and NO2 would decrease in the east wind and high temperature conditions.
Keywords: atmospheric science; air quality; precipitation; temperature; wind direction; wind speed

Title: Impact of urbanization on climate change in Nanjing city

Authors: PEI Xingyun, SUN Weiguo, JIANG Junjie
PP: 1998-2007
Abstract: According to the temperature data of Nanjing and suburban stations and urbanization development information of Nanjing city from 1960 to 2010, combined with statistical analysis, principal component analysis, and regression model, we analyzed the variations of air temperature and researched the impact of urbanization development on air temperature of Nanjing city. The results showed that the annual mean temperature, minimum temperature and maximum temperature at the area near Nanjing city were rising remarkably and conformably in the recent 50 years, warming rate in urban was greater than in the suburb, but reduction rate of temperature daily range in urban was greater than in suburb. The sharp rise happened in the late 1990s, when rapid urbanization emerged in Nanjing city. The dominant factors that influenced temperature change during urbanization included population, land using type, energy consumption and reasonable level of urban development planning, its common interpretation of the rate was up to 83%.
Keywords: atmospheric science; urbanization; principal component analysis; regression model

Title: Review on the impacts of global change on troposphere ozone

Authors: LI Mingwei, SHEN Lulu, WANG Yuxuan
PP: 1992-1997
Abstract: The previous studies on the impacts of anthropogenic emissions and climate change in the future 50-100 years to the global ozone budget and regional ozone air quality were reviewed in this paper. Driven by different future emission scenarios, global ozone budget would increase at a different scale. Domestic emission reduction in developed regions such as U.S. and Europe reduced surface ozone in these areas. Climate change alone would decrease background surface ozone, driven by higher water vapor. However, the summertime surface ozone in polluted regions would increase as well as the frequency and magnitude of pollution episodes. The regional ozone air quality studies had mainly targeted in the developed countries. Concerning the rapid increasing emissions and climate change for China in the future, it was important to investigate the effects of parallel changes in emissions and climate on China s ozone air quality.
Keywords: atmospheric science; ozone; review; global change

Alert Name:
Alerting to:
Authentication email will be sent to your email address in 24 hours
Frequency:
Email Message Format:	Plain text Graphical(HTML)

Complete the form below and we will recommend the selected titles to your friends on your behalf. * Indicates a required field.
Your name*:
Your email address*:
Recipient's name*:
Recipient's email address*:
(multiple recipient's names and email addresses should be separated with semicolons)
Your comments:	I thought you would find the page(s) useful.

Your name:
Your email address:
Recipient's name:
Recipient's email address:
(multiple recipient's names and email addresses should be separated with semicolons)
Your comments:	I thought you would find this page useful.

Disclaimer: This message was sent to your friend using the "Send it to a friend" facility on the Sciencepaper Online’ WWW site, http://www.paper.edu.cn/en. The Sciencepaper Online is not responsible for the content of this email, and anything said in this email does not necessarily reflect the Sciencepaper Online's views.

	Check out RSS, or use RSS reader to subscribe this item