scholarly journals Study on the Effect of Unilateral Sand Deposition on the Spatial Distribution and Temporal Evolution Pattern of Temperature beneath the Embankment

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Ling Chen ◽  
Hong Yu ◽  
Xiaolin Li ◽  
Zekun Ding
Keyword(s):  
Spatial Distribution ◽  
Temperature Field ◽  
Temporal Evolution ◽  
Operation Time ◽  
Tibet Plateau ◽  
Evolution Pattern ◽  
Permafrost Table ◽  
Soil Temperatures ◽  
Sand Particles ◽  
Sand Deposition

In the context of climate warming and the frequent wind-sand hazards in the Qinghai-Tibet Engineering Corridor (QTEC), the construction of the embankment will affect the thermal regime of permafrost underground. The influence of embankment construction on the variation of the permafrost table beneath it is different, especially for the regime with different mean annual ground temperatures (MAGTs). In this study, the effects of the unilateral sand particles deposition on the spatial distribution and temporal evolution pattern of temperature beneath the embankment are investigated through the numerical simulations, in which the heat transfer is considered. The model is validated by the field observed data of soil temperatures around an experimental zone built at the sand hazard area in Honglianghe, the interior of Qinghai-Tibet Plateau (QTP). The simulated results indicate that the temperature field beneath the embankment is asymmetrically distributed under the condition of unilateral sand particles deposition. This asymmetry gradually weakened with the increase of operation time and the gradual adjustment of the permafrost temperature field. By comparing the permafrost table beneath the natural surface, the sand deposition center, and the middle of the embankment center, it could be found that the unilateral sand particles deposition has less effect on the degradation of the permafrost table in the center of the embankment. However, for the center of the sand deposition, the change of the permafrost table is larger with the increase of time and the corresponding rate of permafrost table degradation is higher than that without sand particles deposition, especially for the high-temperature permafrost. In addition, with different sand thickness and width conditions, the effect of “narrow-thick” form sand particles deposition on the temperature field beneath embankment is greater than that of “wide-thin” form sand deposition. Hence, in order to reduce its impact on the long-term thermal condition beneath the embankment, it is necessary to clean the thicker deposition sand particles at the toe of the embankment.

Heat Effect Analysis of Buried Oil Pipeline in the Qinghai-Tibet Plateau

2014 ◽  
Vol 501-504 ◽  
pp. 211-217
Author(s):  
Wei Bo Liu ◽  
Wen Bing Yu ◽  
Xin Yi ◽  
Lin Chen
Keyword(s):  
Temperature Field ◽  
Frozen Soil ◽  
Operating Conditions ◽  
Tibet Plateau ◽  
Soil Mechanic ◽  
Insulation Layer ◽  
Effect Analysis ◽  
Oil Pipeline ◽  
Permafrost Table ◽  
Qinghai Tibet Plateau

The Geermu-Lasa oil pipeline was located in the Qinghai-Tibet Plateau permafrost regions. The building and operating of pipeline will change the temperature field of soil around it, which can lead to changes of frozen soil mechanic properties, and this will induces deformation or even fracture of pipeline. These phenomena will affect the normal transportation of oil. In this paper, temperature field around the pipelines were analyzed due to different pipe diameters and different insulation layer thicknesses in the way of finite element method. The rule of thawing and freezing of soil around the pipeline in an annual cycle was obtained. Artificial permafrost table variations under the pipeline were also obtained due to different operating conditions. For 30cm diameter pipeline with 7cm insulation layer, its artificial permafrost table depth change value is just 0.48m after 30-year running. These analysis results can provide references to the construction of the new Geermu-Lasa oil pipeline.

scholarly journals Temporal evolution and spatial distribution of maternal death

2014 ◽  
Vol 48 (4) ◽  
pp. 662-670 ◽  
Author(s):  
Ioná Carreno ◽  
Ana Lúcia de Lourenzi Bonilha ◽  
Juvenal Soares Dias da Costa
Keyword(s):  
Spatial Distribution ◽  
Maternal Mortality ◽  
Maternal Death ◽  
Temporal Evolution ◽  
Maternal Mortality Ratio ◽  
Rio Grande ◽  
The State ◽  
Rio Grande Do Sul ◽  
Maternal Risk ◽  
Mortality Ratio

OBJECTIVE To analyze the temporal evolution of maternal mortality and its spatial distribution.METHODS Ecological study with a sample made up of 845 maternal deaths in women between 10 and 49 years, registered from 1999 to 2008 in the state of Rio Grande do Sul, Southern Brazil. Data were obtained from Information System on Mortality of Ministry of Health. The maternal mortality ratio and the specific maternal mortality ratio were calculated from records, and analyzed by the Poisson regression model. In the spatial distribution, three maps of the state were built with the rates in the geographical macro-regions, in 1999, 2003, and 2008.RESULTS There was an increase of 2.0% in the period of ten years (95%CI 1.00;1.04; p = 0.01), with no significant change in the magnitude of the maternal mortality ratio. The Serra macro-region presented the highest maternal mortality ratio (1.15, 95%CI 1.08;1.21; p < 0.001). Most deaths in Rio Grande do Sul were of white women over 40 years, with a lower level of education. The time of delivery/abortion and postpartum are times of increased maternal risk, with a greater negative impact of direct causes such as hypertension and bleeding.CONCLUSIONS The lack of improvement in maternal mortality ratio indicates that public policies had no impact on women’s reproductive and maternal health. It is needed to qualify the attention to women’s health, especially in the prenatal period, seeking to identify and prevent risk factors, as a strategy of reducing maternal death.

scholarly journals Supplemental Material: Isotopic spatial-temporal evolution of magmatic rocks in the Gangdese belt: Implications for the origin of Miocene post-collisional giant porphyry deposits in southern Tibet

2021 ◽  
Author(s):  
Chen-Hao Luo ◽  
Rui Wang ◽  
et al.
Keyword(s):  
Spatial Distribution ◽  
Temporal Evolution ◽  
Magma Mixing ◽  
Mixing Models ◽  
Southern Tibet ◽  
Porphyry Deposits ◽  
Magmatic Rocks

Two supplemental pictures and five supplemental tables. The pictures exhibit the Nd-Hf isotopic spatial distribution of the Gangdese belt magmatic rocks, southern Tibet, by using the average isotopic values of per 0.5 longitude (Fig. S1) and two additional magma mixing models related to the Jurassic and Cretaceous Gangdese belt magmatic rocks, southern Tibet (Fig. S2). The talbes contain all the data used in this research and their references.

scholarly journals The Relationship Between Cloud Cover and Outgoing Longwave Radiation in the Southern of Vietnam

2018 ◽  
Vol 34 (1S) ◽  
Author(s):  
Chu Thi Thu Huong ◽  
Bui Thi Hop ◽  
Tran Dinh Linh ◽  
Vu Thanh Hang
Keyword(s):  
Spatial Distribution ◽  
Rainy Season ◽  
Outgoing Longwave Radiation ◽  
Cloud Cover ◽  
Temporal Evolution ◽  
El Nino ◽  
Longwave Radiation ◽  
Downward Trend ◽  
La Nina ◽  
The Relationship

Abstract: Based on the data that has the resolution is 1,00×1,00of the Outgoing Longwave Radiation (OLR) and the cloud cover from NCEP/NCAR in the 1981 – 2012 period, the relationship between the cloud cover and the OLR in the Southern of Vietnam wasinvestigated when analyze and compare the spatial distribution, temporal evolution and their correlation. The results show that the characteristics of the spatial distribution and the year cycle of cloud cover and OLR are inversely correlated. The region or time that the cloud cover is great, the OLR is small and vice versa. In the Southern of Vietnam, the OLR value isgreatest(or smallest) in the dry (or rainy) season and in the El-Nino (La-Nina) years. In addition, during the 1981-2012period, the OLR in this region shows a downward trend about 3.6 W/m2/decade, while the cloud cover tends to increase by 0.2%/decade. Keywords: Cloud cover, Outgoing Longwave Radiation, the Southern of Vietnam.

scholarly journals A method for studying the development pattern of urban commercial service facilities based on customer reviews from social media

2016 ◽  
Vol XLI-B2 ◽  
pp. 577-578
Author(s):  
Y. D. Wang ◽  
B. T. Jiang ◽  
X. Y. Ye
Keyword(s):  
Spatial Distribution ◽  
Road Network ◽  
Temporal Evolution ◽  
Specific Area ◽  
Development Pattern ◽  
Analysis Method ◽  
Customer Reviews ◽  
Urban Service ◽  
Degree Of Satisfaction ◽  
Quantitative Basis

Urbanization is one of the most important human social activities in the 21st century (Chaolin et al., 2012). With an increasing number of people visiting cities, the provision of adequate urban service facilities, including public and commercial service facilities, in locations where people live has become an important guarantee of the success of urbanization. Exploring the commercial service facilities in a specific area of a city can help us understand the progress and trends of urban renewal in the area, provide a quantitative basis for evaluating the rationality of planning implementation, and facilitate an analysis of the effects of different factors on the regional development of a city (Schor et al. 2003). &lt;br&gt;&lt;br&gt; In this paper, we proposed a data processing and analysis method for studying the distribution and development pattern of urban commercial facilities based on customer reviews. In addition, based on road network constraints, we explored the patterns contained in customer reviews data, including patterns for the spatial distribution and spatial-temporal evolution of facilities as well as the number of facilities and degree of satisfaction.

scholarly journals Development of a Pyrometer That Measures the True Temperature Field of the Two-Dimensional Array

2020 ◽  
Vol 10 (8) ◽  
pp. 2888
Author(s):  
Bojun Sun ◽  
Xiaogang Sun ◽  
Meisheng Luan ◽  
Jingmin Dai ◽  
Shuanglong Cui
Keyword(s):  
Temperature Field ◽  
Data Processing ◽  
Operation Time ◽  
Radiation Energy ◽  
Operational Efficiency ◽  
True Temperature ◽  
Signal Acquisition ◽  
Two Dimensional ◽  
Dimensional Array ◽  
Optical Part

This paper develops a two-dimensional array pyrometer, which can measure the true temperature field of the two-dimensional array. The pyrometer consists of an optical part, a circuit part and a software part. In the optical part, the radiation energy of the two-dimensional array target is obtained by scanning with the rotating mirror. Then, the radiation signal is converted and amplified by the circuit part. The software component realizes the functions of the pyrometer calibration, signal acquisition and data processing. The data processing adopts the secondary measurement method to calculate the true temperature and uses the multi-threaded method to improve the operational efficiency. Experiments show that the uncertainty of the two-dimensional pyrometer array can reach 1.43%. Compared with the single-threaded method, the true temperature operation time of the two-dimensional pyrometer array is improved by 77%, which verifies that the software operational efficiency is greatly improved.

scholarly journals Temporal evolution and spatial distribution of dust creation events in Tore Supra and in ASDEX Upgrade studied by CCD image analysis

2010 ◽  
Vol 50 (3) ◽  
pp. 035002 ◽  
Author(s):  
Suk-Ho Hong ◽  
Christian Grisolia ◽  
Volker Rohde ◽  
Pascale Monier-Garbet ◽  
◽  
...  
Keyword(s):  
Image Analysis ◽  
Spatial Distribution ◽  
Temporal Evolution ◽  
Ccd Image

Spatial distribution and changes of permafrost on the Qinghai-Tibet Plateau revealed by statistical models during the period of 1980 to 2010

2019 ◽  
Vol 650 ◽  
pp. 661-670 ◽  
Author(s):  
Tianye Wang ◽  
Tonghua Wu ◽  
Ping Wang ◽  
Ren Li ◽  
Changwei Xie ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Statistical Models ◽  
Tibet Plateau ◽  
Qinghai Tibet Plateau

scholarly journals Six Years Temperature Monitoring Using Fibre-Optic Sensors in a Bioreactor Landfill

Geosciences ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 426
Author(s):  
Moreau ◽  
Jouen ◽  
Grossin-Debattista ◽  
Loisel ◽  
Mazéas ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Temporal Evolution ◽  
Temperature Evolution ◽  
Aerobic Biodegradation ◽  
Household Waste ◽  
Bioreactor Landfill ◽  
Distributed Temperature Sensing ◽  
Sensing Technology ◽  
Different Depths

Temperature is a relevant physical parameter to monitor the biodegradation phases of waste mass. Irstea and the landfill operator SAS Les Champs Jouault have been collaborating since 2011 to study the temporal evolution and the spatial distribution of temperature in a municipal solid waste cell. Using distributed temperature sensing technology, optical fibres were installed in waste mass composed of household waste and industrial waste at different depths during the landfilling period. Temperature distributions were studied from 2012 until 2018 and the same evolutions are observed everywhere with more or less important amplitude variations depending on the location of the measurement point. When landfilled, the waste is at ambient temperature and a significant increase is observed the following year due to the exothermic impact of the aerobic biodegradation phase before a slower decrease during the anaerobic biodegradation phase over several years. Thermal parameters of the waste mass and the surrounding soil, as well as the heat generation function, are calculated using numerical simulation to reproduce the temperature evolution and its spatial distribution. The study of the long-term temperature evolution makes it possible to evaluate the favourable period during which the deposit cell will be in optimal conditions to promote the biodegradation waste processes.

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