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Article ; Online: Characterization of Lower Paleozoic Water and Gas Distribution in Yan'an Gas Field, Ordos Basin.

Gao, Xiaoping / Yuan, Shulong / Tan, Yunlong / Wang, Mengyi / Yang, Yong

ACS omega

2024 Volume 9, Issue 8, Page(s) 9728–9734

Abstract: The distribution of gas and water in the tight gas reservoirs is complex. This limits exploration and development compared to conventional resources. Elucidating the characteristics that control fluid distribution is critical to unlocking the tight gas ... ...

Abstract	The distribution of gas and water in the tight gas reservoirs is complex. This limits exploration and development compared to conventional resources. Elucidating the characteristics that control fluid distribution is critical to unlocking the tight gas potential. This study combines geologic analysis with production data to reveal the water chemistry, gas-water distribution, and factors controlling zoning in the study area. The results show that (a) extracted water includes formation brines, condensate, and residual drilling fluids; (b) formation water dominates production, and the salinity of Lower Paleozoic brines is as high as 169,689 mg/L; (c) low NaCl and high metamorphic coefficients indicate that the water bodies are disconnected and the hydrocarbons are well-preserved in several gas-water systems; and (d) paleomorphological features, tectonics, and lithologies control the distribution of gas water. Discrete water bodies are widely distributed.
Language	English
Publishing date	2024-02-12
Publishing country	United States
Document type	Journal Article
ISSN	2470-1343
ISSN (online)	2470-1343
DOI	10.1021/acsomega.3c09928
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Article ; Online: Evaluation of the Practical Effects of Environmental Measures in the Conservation of Architectural Heritage in Yan'an Based on Recurrent Neural Networks.

Wang, Li

Journal of environmental and public health

2022 Volume 2022, Page(s) 3749482

Abstract: Yan'an is one of the "two holy places" of the Chinese nation and the Chinese revolution and is one ... heritage of Yan'an. ...

Abstract	Yan'an is one of the "two holy places" of the Chinese nation and the Chinese revolution and is one of the first cities of historical and cultural significance and an outstanding tourist city in China, as announced by the state council. The evaluation of the effectiveness of environmental conservation is one of the very important elements of the conservation of Yan'an's architectural heritage. However, the existing evaluation methods cannot provide new solutions for decision-making, the meaning of the comprehensive evaluation function is unclear, the naming clarity is low, there is less quantitative data and more qualitative components, and the results are not easily convincing. This paper proposes a method for evaluating the practical effects of environmental class measures in the conservation of Yan'an's architectural heritage based on recurrent neural networks. The recurrent neural network makes full use of the memory function in the network, considers the causal relationship of the actual effect, and efficiently evaluates the existing measures. In comparison with factor analysis and hierarchical analysis, this paper has greater applicability in evaluating the practical effects of environmental measures in the conservation of Yan'an's architectural heritage and is basically consistent with the results of the theoretical analysis. It provides a scientific basis for the construction and implementation of environmental measures for the architectural heritage of Yan'an.
MeSH term(s)	China ; Cities ; Neural Networks, Computer
Language	English
Publishing date	2022-09-12
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2526611-1
ISSN	1687-9813 ; 1687-9813
ISSN (online)	1687-9813
ISSN	1687-9813
DOI	10.1155/2022/3749482
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Article ; Online: Relationship between ambient air pollution and preterm birth: a retrospective birth cohort study in Yan'an, China.

He, Jinwei / Cao, Na / Hei, Jiangrong / Wang, Huiling / He, Jinrong / Liu, Yizhao / Ren, Yuanyuan

Environmental science and pollution research international

2022 Volume 29, Issue 48, Page(s) 73271–73281

Abstract: ... refined susceptible windows for PTB. We performed a retrospective birth cohort study in Yan'an city ... in the Affiliated Hospital of Yan'an University and Yan'an people's Hospital from January 1, 2018 to December 31 ...

Abstract	Preterm birth (PTB) has been associated with exposure to air pollution, but it is unclear whether effects might vary among air pollution sources in a valley city, and yet few studies have investigated refined susceptible windows for PTB. We performed a retrospective birth cohort study in Yan'an city, a typical valley city in the west of China, and analyze the effects of air pollutants on premature delivery, identify critical windows for maternal air pollutants exposure and PTB. The pregnant women who gave birth in the Affiliated Hospital of Yan'an University and Yan'an people's Hospital from January 1, 2018 to December 31, 2019 were selected as the research objects. A questionnaire survey and medical records were conducted. The daily average concentrations of particulate matter with aerodynamic diameters of ≤ 2.5 μm (PM
MeSH term(s)	Air Pollutants/analysis ; Air Pollution/analysis ; Birth Cohort ; China/epidemiology ; Cohort Studies ; Female ; Humans ; Infant, Newborn ; Maternal Exposure ; Nitrogen Dioxide/toxicity ; Ozone/toxicity ; Particulate Matter/analysis ; Pregnancy ; Premature Birth/chemically induced ; Premature Birth/epidemiology ; Retrospective Studies ; Sulfur Dioxide/toxicity
Chemical Substances	Air Pollutants ; Particulate Matter ; Sulfur Dioxide (0UZA3422Q4) ; Ozone (66H7ZZK23N) ; Nitrogen Dioxide (S7G510RUBH)
Language	English
Publishing date	2022-05-27
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1178791-0
ISSN	1614-7499 ; 0944-1344
ISSN (online)	1614-7499
ISSN	0944-1344
DOI	10.1007/s11356-022-20852-4
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Article ; Online: Genetic characterisation for Yan'an Han population in Northern Shaanxi Province, China, via 38Y-STRs using Yfiler™ Platinum.

Li, Luyao / Yao, Lilan / Gong, Huilin / Luo, Li / Liang, Hau / Zhang, Jiaojiao / Wang, Yuanyuan / He, Guanglin / Jia, Fuquan / Chen, Pengyu

Annals of human biology

2021 Volume 48, Issue 4, Page(s) 327–334

Abstract: ... characterisation of the Chinese Han population residing in Yan'an, in the Northern Shaanxi Province, remain unclear ... Aim: To assess forensic efficiency for 38 Y-Chromosomal STR loci in Yan'an Han population and reveal ... the population genetic relationships between Yan'an Han and other populations at a nationwide and worldwide level ...

Abstract	Background: Haplotype/allele frequency data of Y-chromosomal STR loci in ethnically diverse populations are essential for forensics, anthropology and genealogy. However, genetic structure and forensic characterisation of the Chinese Han population residing in Yan'an, in the Northern Shaanxi Province, remain unclear. Aim: To assess forensic efficiency for 38 Y-Chromosomal STR loci in Yan'an Han population and reveal the population genetic relationships between Yan'an Han and other populations at a nationwide and worldwide level. Subjects and methods: 719 healthy unrelated males were genotyped using the Yfiler™ Platinum system. Haplotype/allele frequencies and forensic parameters were calculated. Multi-dimensional scaling plots (MDS) and neighbor-joining (N-J) tree were used to explore the population structure based on the pairwise gene distances (Rst). Results: A total of 707 haplotypes were identified, among which 697 unique haplotypes were observed (98.59%). The overall haplotype diversity (HD) and discrimination capacity (DC) were 0.9999 and 0.9833, respectively. Comprehensive population comparisons showed Yan'an Han is genetically closer to linguistically similar populations in China, and more related to East Asian populations around the world. Conclusion: The present results give a unique insight into the Yan'an Han population via the set of 38 Y-STRs, which can be used for forensic practice and human genetics research.
MeSH term(s)	China ; Chromosomes, Human, Y/genetics ; Ethnicity/genetics ; Gene Frequency ; Genetics, Population ; Haplotypes ; Humans ; Male ; Microsatellite Repeats/genetics ; Platinum
Chemical Substances	Platinum (49DFR088MY)
Language	English
Publishing date	2021-07-26
Publishing country	England
Document type	Journal Article
ZDB-ID	186656-4
ISSN	1464-5033 ; 0301-4460
ISSN (online)	1464-5033
ISSN	0301-4460
DOI	10.1080/03014460.2021.1951350
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Article ; Online: Assessing vulnerability of coupled human–environment systems and its influence factors in Yan'an City, China

Nan, Guowei / Han, Lei / Wang, Yueyue

Human and Ecological Risk Assessment: An International Journal. 2022 Aug. 9, v. 28, no. 7 p.783-801

2022

Abstract: ... evolution and influencing factors of coupled human–environment system in Yan'an City. The results show ... that: (1) The overall vulnerability of coupled human–environment systems in Yan'an city from 2000 to 2014 ...

Abstract	The natural, economic, social, resource and other factors were incorporated into the framework of VSD model, and vulnerability and obstacle degree models were used to analyze the spatio-temporal evolution and influencing factors of coupled human–environment system in Yan'an City. The results show that: (1) The overall vulnerability of coupled human–environment systems in Yan'an city from 2000 to 2014 is between 0.2589 and 17.0180, the vulnerability index values of counties in the northwest and northeast are higher, while those in the central and southern regions are lower. (2) The spatial variability in exposure (0.1516–0.2255), sensitivity (0.2235–0.3093), adaptive capacity (0.6588–0.8865) and vulnerability (0.7502–0.7949) in the study area from 2000 to 2014 showed a downward trend. The spatial variability in exposure and sensitivity in each period was moderate, while adaptive capacity and vulnerability displayed strong variability. (3) There are significant differences in the obstacles affecting vulnerability in the study area. Unreasonable economic structure, fragile ecological environment, low level of economic and social development and low efficiency of production are the leading factors affecting the sustainability of coupled human–environment system, which means that how to adjust the economic structure and improve the ecological environment is the key to the sustainable development of resource-based cities.
Keywords	economic structure ; environmental assessment ; humans ; models ; sustainable development ; China ; Resource-based cities ; coupled human–environment system ; VSD model ; vulnerability
Language	English
Dates of publication	2022-0809
Size	p. 783-801.
Publishing place	Taylor & Francis
Document type	Article ; Online
ISSN	1549-7860
DOI	10.1080/10807039.2022.2093156
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Article ; Online: Identification of a Novel HIV-1 Unique CRF01_AE/C Recombinant in Yan'an City, Shaanxi Province.

Cheng, Si-Wei / Qi, Feng / Xie, Ying-Na / Wang, Na / Chen, Yan-Ping / Gao, Li-Li / Chen, Xin / Zhou, Yan-Heng

AIDS research and human retroviruses

2020 Volume 36, Issue 11, Page(s) 952–956

Abstract: ... isolated from a female patient infected HIV-1 through heterosexual transmission in Yan'an city, Shaanxi ...

Abstract	A wide variety of HIV-1 recombinants are constantly discovered in China. Comprehensively monitoring the genetic diversity of HIV-1 is very essential for understanding the molecular epidemiology and controlling the spread of the HIV-1 epidemic. In this study, we presented a novel HIV-1 unique CRF01_AE/C recombinant (19YA001) isolated from a female patient infected HIV-1 through heterosexual transmission in Yan'an city, Shaanxi province. The near full-length genome analyses showed 19YA001 was divided into two CRF01_AE and one C segments by two breakpoints observed in the
MeSH term(s)	China/epidemiology ; Female ; Genome, Viral ; Genotype ; HIV Infections/epidemiology ; HIV-1/genetics ; Humans ; Phylogeny ; Recombination, Genetic
Language	English
Publishing date	2020-08-27
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	639130-8
ISSN	1931-8405 ; 0889-2229
ISSN (online)	1931-8405
ISSN	0889-2229
DOI	10.1089/AID.2020.0174
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Article: Analysis of spatial variability in factors contributing to vegetation restoration in Yan'an, China

Zhang, Daojun / Jia, Qiqi / Wang, Peng / Zhang, Jinting / Hou, Xianhui / Li, Xiandong / Li, Wangjun

Ecological indicators. 2020 June, v. 113

2020

Abstract: ... based on the Ordinary Least Squares is at risk of failure. With Yan'an as the study area ...

Abstract	As a typical ecologically fragile region, the Loess Plateau of China has much improved in the ecological environment in the past two decades. In order to achieve a more efficient implementation of ecological projects in the future, it is of great importance to study the influencing factors and the driving mechanism of vegetation restoration based on past vegetation restoration practices. However, human activity and natural factors may show different coupling effects in contributing to the vegetation restoration in different locations because of their spatial heterogeneity. In that case, the traditional global regression based on the Ordinary Least Squares is at risk of failure. With Yan'an as the study area, vegetation index data in 2000 and 2011 were used to calculate the vegetation improvement map during the ecological projects; taking this map as the dependent variable, and the topographical, meteorological, socio-economic, and policy factors as independent variables, Geographically Weighted Regression model which can well deal with spatial heterogeneity, together with the Ordinary Least Squares model, was applied in this study. The results show: (1) most of the variables selected in this research have significant impacts on the vegetation restoration, while meteorological and socio-economic factors make greater contributions; (2) the effect of factors contributing to vegetation coverage improvement varies substantially across the study site, with climatic and physical factors dominating, and socio-economic/policy factors playing either positive or negative roles in different parts of the study area. It could be concluded that spatial variability in factors contributing to vegetation restoration should be well considered when performing ecological policy evaluation, and Geographically Weighted Regression method has unparalleled advantages of Ordinary Least Squares model in this aspect since it provides scientific reference for policymakers to make effective decisions according to local conditions and maximize the effectiveness of ecological policies.
Keywords	ecological restoration ; humans ; models ; policy analysis ; risk ; spatial variation ; vegetation ; vegetation index ; China
Language	English
Dates of publication	2020-06
Publishing place	Elsevier Ltd
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	2036774-0
ISSN	1872-7034 ; 1470-160X
ISSN (online)	1872-7034
ISSN	1470-160X
DOI	10.1016/j.ecolind.2020.106278
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Article ; Online: Identification of low-overpressure interval and its implication to hydrocarbon migration: Case study in the Yanan sag of the Qiongdongnan Basin, South China Sea.

Xu, Qinghai / Shi, Wanzhong / Xie, Yuhong / Wang, Zhenfeng / Li, Xusheng / Tong, Chuanxin

PloS one

2017 Volume 12, Issue 9, Page(s) e0183676

Abstract: ... in the Yanan Sag of western basin. The mechanisms of the low-overpressure interval are not well understood ...

Abstract	The Qiongdongnan Basin is a strongly overpressured basin with the maximum pressure coefficient (the ratio of the actual pore pressure versus hydrostatic pressure at the same depth) over 2.27. However, there exists a widespread low-overpressure interval between the strong overpressure intervals in the Yanan Sag of western basin. The mechanisms of the low-overpressure interval are not well understood. Three main approaches, pore pressure test data and well-log analysis, pressure prediction based on the relationship between the deviation of the velocity and the pressure coefficients, and numerical modeling, were employed to illustrate the distribution and evolution of the low-overpressure interval. And we analyzed and explained the phenomenon of the low-overpressure interval that is both underlain and overlain by high overpressure internal. The low-overpressure interval between the strong overpressure intervals can be identified and modelled by drilling data of P-wave sonic and the mud weight, and the numerical modeling using the PetroMod software. Results show that the low-overpressure interval is mainly composed of sandstone sediments. The porosities of sandstone in the low-overpressure interval primarily range from 15%-20%, and the permeabilities range from 10-100 md. Analysis of the geochemical parameters of C1, iC4/nC4, ΔR3, and numerical modeling shows that oil and gas migrated upward into the sandstone in the low-overpressure interval, and then migrated along the sandstone of low-overpressure interval into the Yacheng uplift. The low-overpressure both underlain and overlain by overpressure resulted from the fluids migrating along the sandstones in the low-overpressure interval into the Yacheng uplift since 1.9Ma. The mudstone in the strong overpressure interval is good cap overlain the sandstone of low-overpressure interval, therefore up-dip pinchouts or isolated sandstone in the low-overpressure interval locating the migration path of oil and gas are good plays for hydrocarbon exploration.
MeSH term(s)	China ; Hydrocarbons ; Hydrostatic Pressure ; Models, Statistical ; Oceans and Seas ; Porosity
Chemical Substances	Hydrocarbons
Language	English
Publishing date	2017
Publishing country	United States
Document type	Journal Article
ISSN	1932-6203
ISSN (online)	1932-6203
DOI	10.1371/journal.pone.0183676
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Article ; Online: An analysis of the impact on land use and ecological vulnerability of the policy of returning farmland to forest in Yan'an, China.

Hou, Kang / Li, Xuxiang / Wang, Jing Jing / Zhang, Jing

Environmental science and pollution research international

2016 Volume 23, Issue 5, Page(s) 4670–4680

Abstract: ... types in this ecologically vulnerable area. Taking eight counties in Yan'an, Shaanxi province, China ... vulnerability. Based on thematic mapper (TM) images of Yan'an in 1997, 2004, and 2011, the dynamic changes ... evaluated using the spatial principal component analysis (SPCA) model in Yan'an region. Using the natural ...

Abstract	During the past decades, land use change has taken place around the Loess Plateau at unprecedented rates. Due to the impact of existing land use policy, great changes have taken place in the land use types in this ecologically vulnerable area. Taking eight counties in Yan'an, Shaanxi province, China, as the study area, this study analyzed the long-term (from 1997 to 2011) changes in land use and ecological vulnerability. Based on thematic mapper (TM) images of Yan'an in 1997, 2004, and 2011, the dynamic changes in land use are analyzed with the application software for remote sensing (RS) and geographic information system (GIS) since the implementation of the policy of returning farmland to forest. Combined with the land use data, the local socio-economic data, and natural resources condition, ecological vulnerability is evaluated using the spatial principal component analysis (SPCA) model in Yan'an region. Using the natural breaks classification (NBC), the evaluation results are divided into five categories: potential, slight, light, medium, and heavy. The results show that although the regional land use types changed markedly, the ecological vulnerability in the study shows greater than average optimism, and the ecological vulnerability index of the southern four counties is lower than that of the northern four counties. In 1997-2011, the eco-environmental quality gradually improved in most areas. However, it gradually deteriorated in some regions.
MeSH term(s)	Agriculture ; China ; Ecosystem ; Environmental Restoration and Remediation ; Forests ; Geographic Information Systems ; Principal Component Analysis ; Public Policy
Language	English
Publishing date	2016-03
Publishing country	Germany
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1178791-0
ISSN	1614-7499 ; 0944-1344
ISSN (online)	1614-7499
ISSN	0944-1344
DOI	10.1007/s11356-015-5679-9
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Article: Dynamic change in spring habitat use by the brown eared pheasant (Crossptilon mantchuricum) in the Huanglong mountains, Yanan City, Shaanxi Province, China.

Li, Hong-Qun / Liu, Xiao-li / Wang, Ren-He / Wang, Yong-Bin / Bridge, Eli S / Yue, Bi-Song / Chen, Jin-Zhao / Xiao, Xiang-Ming

Zoological science

2014 Volume 31, Issue 8, Page(s) 529–534

Abstract: ... Crossoptilon mantchuricum) in the Huanglongshan Nature Reserve, Yanan City, Shaanxi Province, China, from early ...

Abstract	Characterization of foraging-site preferences of threatened and endangered species is a key component of effective habitat conservation. We studied foraging-site selection by the brown eared pheasant (Crossoptilon mantchuricum) in the Huanglongshan Nature Reserve, Yanan City, Shaanxi Province, China, from early February to end of May 2011. We identified feeding sites by locating tracks and scratches characteristic of the birds, and compared habitat characteristics at these sites to those at randomly selected sites across the study area. During the pre-breeding season, the birds tended to be found in the areas characterized by gullies within mixed forests with intermediate sun exposure on gentle slopes (< 10°), and close to water and footpaths. The sites utilized by the birds also featured greater tree diameter, lower shrub density, lower grass cover, and lower altitude than random sites. During the breeding season, the birds tended to be found in the areas of slightly higher altitude, more shrubs, moderately steep slopes (10°-20°), and farther from water and paths. These patterns were consistent with seasonal changes in vegetation and food-resource availability in the study area. Management of brown eared pheasants' populations for conservation must account for these seasonal shifts in habitat requirements.
MeSH term(s)	Animals ; China ; Demography ; Ecosystem ; Galliformes/physiology ; Reproduction/physiology ; Seasons
Language	English
Publishing date	2014-08
Publishing country	Japan
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2038883-4
ISSN	0289-0003
ISSN	0289-0003
DOI	10.2108/zs130163
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