Search results for: Xiang-Yu Tang

Items from 1 to 18 out of 18 results

article

Spatial distribution of the oxygen-18 in precipitation in China based on a new empirical model

Pei Zhao, Zheng-sheng Guo, Dong-li She, Xiang-yu Tang

Journal of Mountain Science > 2019 > 16 > 11 > 2605-2614

Modeling the oxygen-18 in precipitation based on regional topography and meteorological factors is helpful to constrain missing isotopic data in some regions that is required for many paleoclimate, eco-hydrological and atmospheric circulation studies. Therefore, the relationship between δ¹⁸O in precipitation (δ¹⁸O_PPT) and the affecting factors need to be thoroughly understood. We present a model considering...

article

Biochar influences soil carbon pools and facilitates interactions with soil: A field investigation

Ali El‐Naggar, Yasser M. Awad, Xiang‐Yu Tang, Chen Liu, more

Land Degradation & Development > 29 > 7 > 2162 - 2171

Biochar promotes the storage of organic carbon (OC) in soils. OC is unevenly distributed in soils among different particle‐size fractions showing different structures, functions, and stability. The objective of this study was to investigate the biochar–soil interactions and the redistribution of soil C in different soil fractions based on a 2‐year field experiment. Fractionation was done by particle...

article

A review of source tracking techniques for fine sediment within a catchment

Zhuo Guan, Xiang-Yu Tang, Jae E. Yang, Yong Sik Ok, more

Environmental Geochemistry and Health > 2017 > 39 > 6 > 1221-1243

Excessive transport of fine sediment, and its associated pollutants, can cause detrimental impacts in aquatic environments. It is therefore important to perform accurate sediment source apportionment to identify hot spots of soil erosion. Various tracers have been adopted, often in combination, to identify sediment source type and its spatial origin; these include fallout radionuclides, geochemical...

article

Adsorption of linear alkylbenzene sulfonates on carboxyl modified multi-walled carbon nanotubes

Zhuo Guan, Xiang-Yu Tang, Taku Nishimura, Yu-Ming Huang, more

Journal of Hazardous Materials > 2017 > 322 > PA > 205-214

Understanding of the adsorption behavior of organic pollutants on carbon nanotubes (CNTs) and its governing factors are crucial for the assessment of transport and fate of organic pollutants. This study explored adsorption characteristics of linear alkylbenzene sulfonates (LAS) on carboxyl modified multi-walled carbon nanotubes (CMMWCNTs) and the effect of solution chemistry and temperature on LAS...

article

A field study of colloid transport in surface and subsurface flows

Wei Zhang, Xiang-Yu Tang, Qing-Song Xian, Noam Weisbrod, more

Journal of Hydrology > 2016 > 542 > C > 101-114

Colloids have been recognized to enhance the migration of strongly-sorbing contaminants. However, few field investigations have examined combined colloid transport via surface runoff and subsurface flows. In a headwater catchment of the upper Yangtze River, a 6m (L) by 4m (W) sloping (6°) farmland plot was built by cement walls to form no-flow side boundaries. The plot was monitored in the summer...

article

Spatial distribution of soil hydraulic parameters estimated by pedotransfer functions for the Jialing River Catchment, Southwestern China

Wen-Juan Lei, Xiang-Yu Tang, Brian J. Reid, Xiang-Yang Zhou

Journal of Mountain Science > 2016 > 13 > 1 > 29-45

Soil hydraulic parameters θ _s, α, n, K _s, L and θ _r of the van Genuchten-Mualem model were estimated using three pedotransfer functions (PTFs) based on soil properties for surface soils of the largest main tributary catchment (the Jialing River) of the upper Yangtze River in China. The soil database was from the second national soil survey of China with a spatial 30 X...

article

A coupled field study of subsurface fracture flow and colloid transport

Wei Zhang, Xiang-Yu Tang, Noam Weisbrod, Pei Zhao, more

Journal of Hydrology > 2015 > 524 > C > 476-488

Field studies of subsurface transport of colloids, which may act as carriers of contaminants, are still rare. This is particularly true for heterogeneous and fractured matrices. To address this knowledge gap, a 30-m long monitoring trench was constructed at the lower end of sloping farmland in central Sichuan, southwest China. During the summer of 2013, high resolution dynamic and temporal fracture...

article

Comparative study of DSC-PWI and 3D-ASL in ischemic stroke patients

Shui-xia Zhang, Yi-hao Yao, Shun Zhang, Wen-jie Zhu, more

Journal of Huazhong University of Science and Technology [Medical Sciences] > 2015 > 35 > 6 > 923-927

The purpose of this study was to quantitatively analyze the relationship between three dimensional arterial spin labeling (3D-ASL) and dynamic susceptibility contrast-enhanced perfusion weighted imaging (DSC-PWI) in ischemic stroke patients. Thirty patients with ischemic stroke were included in this study. All subjects underwent routine magnetic resonance imaging scanning, diffusion weighted imaging...

article

Shear deformation and plate shape control of hot-rolled aluminium alloy thick plate prepared by asymmetric rolling process

Yu-bo ZUO, Xing FU, Jian-zhong CUI, Xiang-yu TANG, more

Transactions of Nonferrous Metals Society of China > 2014 > 24 > 7 > 2220-2225

Asymmetric rolling (ASR), as one of severe plastic deformation (SPD) methods to make ultra-fine materials with enhanced performance is mainly used to prepare foil and thin strip. The asymmetrical rolling was achieved by adjusting the diameters of the upper roll and the bottom roll and was used to prepare hot-rolled thick plate of 5182 aluminium alloy. The shear deformation and plate shape control...

article

Historical sediment record of ¹³⁷Cs, δ-HCH, and δ ¹³C reflects the impact of land use on soil erosion

Xiang-Yu Tang, Xin-Bao Zhang, Zhuo Guan, Yi Long, more

Journal of Mountain Science > 2014 > 11 > 4 > 866-874

This paper reports the concentrations of ¹³⁷Cs, hexachlorocyclohexane (HCH), dichlorodiphenyltrichloroethanes (DDT) and its main degradation products, δ ³C, and organic carbon in pond sediments (0–210 cm, sectioned by 2–20 cm interval) and surface soils (the 0–3 cm horizon) collected in 2010 from Chenjia catchment, which is located in Yanting county in the hilly central Sichuan of China. α-, β-, and...

article

Air-drying and liming effects on exchangeable cadmium mobilization in contaminated soils: A repeated batch extraction study

Xiang-Yu Tang, Hidetaka Katou, Katsuhiro Suzuki, Toshikazu Ohtani

Geoderma > 2011 > 161 > 1-2 > 18-29

Air-drying of soil samples is known to increase the exchangeable fraction of cadmium (Cd) in soil. Liming, on the other hand, reduces bioavailability of heavy metals in soil by metal hydrolysis reactions and/or coprecipitation with carbonate. However, due attention has not been paid to desorption and mobilization of Cd from air-dried and limed soils at realistic ionic strengths. We compared Cd desorption...

article

Colloid-facilitated transport of lead in natural discrete fractures

Xiang-Yu Tang, Noam Weisbrod

Environmental Pollution > 2009 > 157 > 8-9 > 2266-2274

Colloid-facilitated transport of lead (Pb) was explored in a natural chalk fracture with an average equivalent hydraulic aperture of 139 μm. Tracer solution was prepared by adding montmorillonite (100 mg L ⁻¹ ) and/or humic acid (HA) (10 mg L ⁻¹ ) to modified artificial rainwater containing dissolved Pb (21.4 mg Pb L ⁻¹ ), naturally precipitated PbCO ₃ particles (16...

article

Pilot study of temporal variations in lead bioaccessibility and chemical fractionation in some Chinese soils

Xiang-Yu Tang, Yan-Shan Cui, Jing Duan, Lily Tang

Journal of Hazardous Materials > 2008 > 160 > 1 > 29-36

The effect of ageing, following the addition of ∼400mgkg ⁻¹ lead (Pb) as Pb(NO ₃ ) ₂ , on Pb bioaccessibility was examined in five typical Chinese soils using a physiologically based extraction test. Sequential extraction was employed to identify the source fraction(s) of bioaccessible Pb in the soils. Pb bioaccessibility decreased exponentially to nearly steady levels in mildly...

article

The ageing effect on the bioaccessibility and fractionation of arsenic in soils from China

Xiang-Yu Tang, Yong-Guan Zhu, Xiao-Quan Shan, Ron McLaren, more

Chemosphere > 2007 > 66 > 7 > 1183-1190

Ingestion of contaminated soil has been recognized as an important exposure pathway of arsenic for humans, especially for children through outdoor hand-to-mouth activities. An improved sequential extraction procedure was employed in an attempt to reveal the relationship between bioaccessibility and fractionation of As in five soils from China. Arsenic bioaccessibility in acidic (≈pH 4.5) soils reached...

article

Identification of 137Cs Reference Sites in Southeastern China1 1 Project supported by the National Key Basic Research Support Foundation of China (No. G1999011801), the National Natural Science Foundation of China (No. 49973027), and Japan Society for the Promotion of Science (No. P04575).

Xiang-Yu TANG, Hao YANG, Ming-Yuan DU, Qi-Guo ZHAO, more

Pedosphere > 2006 > 16 > 4 > 468-476

The ¹³⁷ Cs vertical distributions in uncultivated and cultivated soils, developed from Quaternary red clay, granite, argillaceous shale, and red sandstone, were studied to develop reliable guidelines for selecting reference sites in southeastern China, which is dominated by strong acidic and/or clay-textured soils, and examine their reliability by comparing them to the reported ¹³⁷ ...

article

The effect of ageing on the bioaccessibility and fractionation of cadmium in some typical soils of China

Xiang-Yu Tang, Yong-Guan Zhu, Yan-Shan Cui, Jing Duan, more

Environment International > 2006 > 32 > 5 > 682-689

Ingestion of contaminated soil has been recognized as an important exposure pathway of cadmium (Cd) for humans, especially for children through outdoor hand-to-mouth activities. The effect of ageing process following the input of Cd into soil on the bioaccessibility of Cd in five typical soils of China was investigated using physiologically based in vitro test in this study. A sequential extraction...

article

Assessment of the bioaccessibility of polycyclic aromatic hydrocarbons in soils from Beijing using an in vitro test

Xiang-Yu Tang, Lily Tang, Yong-Guan Zhu, Bao-Shan Xing, more

Environmental Pollution > 2006 > 140 > 2 > 279-285

As an important human exposure pathway of contaminants, soil ingestion is of increasing concern for assessing health risk from polycyclic aromatic hydrocarbons (PAHs) in soils. A wide range of total PAH concentrations ranging from 0.112μg g ⁻¹ to 27.8μg g ⁻¹ in soils collected from different public sites, including gas stations, roadsides, bus stops, a kindergarten, primary and middle...

article

Contamination of polycyclic aromatic hydrocarbons (PAHs) in urban soils in Beijing, China

Lily Tang, Xiang-Yu Tang, Yong-Guan Zhu, Ming-Hui Zheng, more

Environment International > 2005 > 31 > 6 > 822-828

Soil contamination with polycyclic aromatic hydrocarbons (PAHs) is an increasing problem in many countries, including China. An extensive and systematic survey has been undertaken to evaluate the contamination with PAHs of urban soils in Beijing, China. Soil samples were collected from campuses of universities, schools and kindergartens, public squares, fallow land and roadsides, and were analyzed...

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